US20060156766A1 - Washing machine with drying function - Google Patents
Washing machine with drying function Download PDFInfo
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- US20060156766A1 US20060156766A1 US11/335,555 US33555506A US2006156766A1 US 20060156766 A1 US20060156766 A1 US 20060156766A1 US 33555506 A US33555506 A US 33555506A US 2006156766 A1 US2006156766 A1 US 2006156766A1
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- Prior art keywords
- water
- tub
- laundry
- washing machine
- temperature
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F25/00—Washing machines with receptacles, e.g. perforated, having a rotary movement, e.g. oscillatory movement, the receptacle serving both for washing and for centrifugally separating water from the laundry and having further drying means, e.g. using hot air
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F33/00—Control of operations performed in washing machines or washer-dryers
- D06F33/50—Control of washer-dryers characterised by the purpose or target of the control
- D06F33/52—Control of the operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
- D06F2103/02—Characteristics of laundry or load
- D06F2103/12—Temperature
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
- D06F2105/14—Temperature of laundry
Definitions
- the present invention relates to a washing machine having a drying function and provided with a warm-air generator.
- a drum washing machine with a drying function can provide effective washing action while reserving a relatively smaller amount of water in a lower interior of a water tub or drum, for example. Accordingly, the aforesaid drum washing machine can achieve water saving. Furthermore, laundry is vertically moved in a drum when the drum is rotated. When warm air is supplied into the drum, the entire laundry can efficiently be dried while being agitated.
- the above-described type drum washing machine with the drying function has recently been diffused rapidly.
- a method of warming wash water includes heating wash water by a sheathed heater disposed on a bottom of a wash tub, and introducing, into a drum, warm air produced by a warm-air supplier comprising a fan and a heater so that wash water is heated.
- JP-A-2-277494 discloses the construction of a drum washing machine of the aforesaid type, for example.
- the sheathed heater disposed in the water needs to be provided with a safety arrangement against electric leakage.
- both wash water and warm air are fluid and accordingly, thermal conduction from warm air to wash water has a low efficiency, whereupon it takes a lot of time to warm overall wash water in the drum.
- an object of the present invention is to provide a washing machine with a drying function, in which wash water can be heated by a simple construction efficiently.
- the present invention provides a washing machine with a drying function, comprising a water tub, a rotating tub provided in the water tub so as to be rotatable, a driver rotating the rotating tub, a circulation passage defined so as to communicate with the water tub, a warm-air supply unit circularly supplying warm air through the circulation passage into the water tub and the rotating tub, a water-supply unit supplying water into the water tub, a control unit controlling the driver, the warm-air supply unit and the water-supply unit thereby to be capable of controlling wash, rinse, dehydration and drying steps, and a preheating unit executing a preheating operation in which warm air is supplied into the water tub and the rotating tub during rotation of the rotating tub before the wash step is executed.
- the preheating operation is carried out before the wash step is carried out and when no water is reserved in the water tub. Accordingly, warm air is supplied into the water tub and the rotating tub so that heat is directly applied to laundry, the water tub and the rotating tub. Water reserved in the water tub in the wash tub subsequently to the preheating is warmed by making use of heat stored in the laundry, water tub and rotating tub by the preheating. Consequently, heat can be conducted from the warm air to water in the water tub more efficiently as compared with the construction that water in the water tub is directly heated by warm air.
- FIG. 1 is a schematic front view of a drum washing machine with a drying function in accordance with a first embodiment of the present invention
- FIG. 2 is a schematic block diagram showing an electrical arrangement of the washing machine
- FIG. 3 is a flowchart showing a washing operation
- FIGS. 4A to 4 C illustrate water levels in a water tub and motion of laundry in a preheating, preliminary washing and main washing respectively;
- FIG. 5 is a graph showing the relationship between an amount of laundry and a water temperature, a temperature in a water tub and a target laundry temperature;
- FIG. 6 is a view similar to FIG. 1 , showing a second embodiment of the invention.
- FIG. 7 is a view similar to FIG. 4A ;
- FIG. 8 is a graph showing the relationship between an amount of laundry, and a temperature in a water tub and a target laundry temperature in a modified form of the first embodiment.
- a washing machine with a drying function includes a generally cylindrical water tub 1 and a generally cylindrical rotating tub or drum 2 mounted in the water tub.
- the water tub 1 is elastically supported by elastic supporting units (not shown).
- the water tub 1 is substantially non-porous and accordingly enables to reserve water.
- the drum 2 serves as a washing tub, dehydrating tub and drying tub and has a number of through-holes 2 a formed through a circumferential wall thereof.
- the drum 2 further has a plurality of baffles (not shown).
- a brushless DC motor 3 of the outer rotor type (serving as a driver) is mounted on a left side of the water tub 1 , for example.
- the motor 3 has a rotational shaft 3 a horizontally extending through a hole (not shown) of the water tub 1 to be connected to a central left side of the drum 2 .
- the drum 2 is rotated with a rotor (not shown) of the motor 3 .
- a support shaft 2 b coaxial with the rotational shaft 3 a protrudes from a side of the drum 2 opposed to the motor 3 and is rotatably supported on the corresponding side of the water tub 1 .
- the drum 2 is thus rotated about a substantially horizontal axis.
- the water tub 1 has a peripheral wall including an upper part formed with an access opening (not shown) through which laundry is put into and taken out of the drum 2 .
- the drum 2 has an opening (not shown) corresponding to the access opening.
- the drum 2 is controlled so as normally to stop with the opening being located at an upper part of the drum so that laundry can be put into and taken out of the drum 2 through the upper part of the drum.
- a circulation passage 4 with a duct structure is defined on the right of the water tub 1 .
- the water tub 1 has a warm-air outlet 1 a formed through a lower right portion thereof.
- the circulation passage 4 has one end connected to the warm-air outlet 1 a .
- the water tub 1 also has warm-air inlets 1 b formed through a potion of the water tub 1 around the support shaft 2 b mounted on the right side of the water tub.
- the drum 2 also has openings 2 c formed through a portion of the drum 2 around the support shaft 2 b so that the openings correspond to the warm-air inlets 1 b respectively.
- the circulation passage 4 has the other end connected to the warm-air inlet 1 b.
- a water-cooled heat exchanger 5 is provided in the middle of the circulation passage 4 .
- a water pouring unit 6 is provided in an upper portion of the heat exchanger 5 for pouring water into an interior of the heat exchanger.
- a blowing fan unit 7 and a heater unit 8 are provided in an upper interior of the circulation passage 4 located over the heat exchanger 5 . When the blowing fan unit 7 and the heater unit 8 are driven, air in the circulation passage 4 is heated so that warm air is produced. The warm air is caused to flow in a direction of arrow A in FIG. 1 by the blowing action of the blowing fan unit 7 to be supplied through the warm-air inlets 1 b and openings 1 c into the water tub 1 and the drum 2 .
- the warm air supplied into the drum 2 flows through the holes 2 a into the water tub 1 , returning through the warm-air outlets 1 a into the circulation passage 4 .
- the warm air is then caused to flow upward through the heat exchanger 5 .
- the blowing fan unit 7 and heater unit 8 serve as warm-air supply unit in the embodiment.
- a drain hole 9 is formed in the bottom of the water tub 1 .
- a drain hose 10 is connected via a drain valve 11 to the drain hole 9 .
- An overflow port 12 is formed in the right side of the water tub 1 so as to be located below the warm-air inlet 1 b .
- An overflow hose 13 is connected to the overflow port 12 .
- the overflow hose 13 is further connected to the drain hose 10 downstream with respect to the drain valve 11 .
- a temperature sensor 14 is mounted on a portion of the right side inner face of the water tub 1 located just over the overflow port 12 .
- the temperature sensor 14 comprises a thermistor and detects a temperature in the water tub 1 .
- Another temperature sensor 15 is provided in the lower interior of the heat exchanger 5 .
- the temperature sensor 15 also comprises a thermistor and detects a temperature of water supplied from the water pouring unit 6 .
- the temperature sensor 14 serves as a laundry temperature sensor, whereas the temperature sensor 15 serves an ambient temperature sensor.
- FIG. 2 shows an electrical arrangement of the washing machine.
- a control device 20 comprises a microcomputer and serves as a control unit for controlling an overall operation of the washing machine and a preheating unit.
- Connected to the control device 20 are a switch input section 21 , a water level sensor 22 , a rotation sensor 23 and the aforesaid temperature sensors 14 and 15 .
- the switch input section 21 delivers a detection signal (operation signal) according to an amount of operation of an operation switch (not shown).
- the water level sensor 22 delivers a detection signal according to a water level in the water tub 1 .
- the rotation sensor 23 delivers a detection signal according to a rotational speed of the motor 3 .
- the motor 3 is connected via an inverter circuit 24 to the control device 20 .
- a water-supply valve 26 (a water-supply unit), a heater element 27 , a fan motor 28 , the drain valve 11 are connected via a drive circuit 25 to the control device 20 .
- the water-supply valve 26 switches a water supply path between a water-supply path extending from a tap (not shown) of the water service to the water pouring unit 6 and a water-supply path extending from the tap to the water tub 1 .
- the heater element 27 constitutes the heater unit 8
- the fan motor 28 constitutes the blowing fan unit 7 .
- the control device 20 controls the motor 3 , water-supply valve 26 , heater element 27 , fan motor 28 and drain valve 11 based on a control program previously stored therein.
- FIG. 3 is a flowchart showing processing for a standard washing/drying operation.
- the drain valve 11 is opened so that a draining operation is carried out (step S 1 ). Consequently, even when water is present in the water tub 1 upon start of the operation, all the water is discharged from the water tub 1 .
- the weight of laundry in the drum 2 is detected.
- the water-supply valve 26 is switched at step S 3 so that the water-supply path leading to the water pouring unit 6 is opened. As a result, the water pouring unit 6 starts a water pouring operation.
- step S 4 the drum 2 is rotated, for example, at 400 rpm.
- step S 5 the heater element 27 and the fan motor 28 are energized, so that warm air flows through the circulation passage 4 to be supplied into the water tub 1 .
- the steps S 3 , S 4 and S 5 are carried out substantially simultaneously. More specifically, warm air is circulated through the circulation passage 4 supplied with water and the rotating drum 2 . Consequently, moisturized warm air is supplied into the drum 2 and the water tub 1 so that heat is applied to laundry in the drum 2 as well as to the drum 2 and the water tub 1 . Accordingly, the treatment at steps S 3 to S 5 constitutes a preheating. Since the drain valve 11 is open in the preheating operation, water is discharged through the drain hole 9 without being reserved. Accordingly, a part of the circulation passage 4 near the warm-air outlet 1 a can be prevented from being closed by water, or water can be prevented from entering the drum 2 .
- a rotational speed of the drum 2 at step S 4 is set to about 400 rpm in the embodiment.
- the reason for this setting is as follows: an experiment conducted by the inventors shows that a centrifugal force starts acting upon laundry and warm air in the drum 2 when a rotational speed of the drum 2 exceeds about 300 rpm and that the centrifugal force moves laundry in the drum uniformly to an inner peripheral surface of the drum 2 as shown in FIG. 4A when the rotational speed of the drum 2 ranges from 400 rpm to 500 rpm (symbol “W” in FIG. 4 designates laundry) Furthermore, warm air flowing into the central interior of the drum 2 is also caused to flow toward the peripheral wall of the drum 2 by the centrifugal force as shown by arrow in FIG. 1B . On the other hand, noise is produced when the rotational speed of the drum 2 exceeds about 400 rpm. In view of the above drawback, the rotational speed of the drum 2 is set so that warm air is blown against the whole laundry uniformly while noise production is restrained
- the above-described preheating finishes when the temperature of laundry in the drum 2 has reached a target temperature.
- the control device 20 reads the detection signals of the temperature sensors 14 and 15 during the preheating operation.
- the control device 20 estimates a target temperature of the laundry based on the read detection signal of the temperature sensor 14 .
- the control device 20 is arranged to change the target temperature of laundry according to an amount of laundry and the detection signal of the temperature sensor 15 . The relationship among the target temperature of the laundry, the amount of laundry and detection temperatures of temperature sensors 14 and 15 will be described later.
- the control device 20 advances to step S 6 to execute a first water-supply.
- the water-supply valve 26 is switched in the first water-supply so that the water-supply path from the tap to the water tub 1 is opened, whereupon water is supplied into the water tub 1 .
- water is adapted to be supplied through a detergent case (not shown) into the water tub 1 .
- detergent contained in the detergent case is supplied into the water tub 1 with the water.
- the first water supply is carried out until a water level as shown by “L 1 ” in FIG. 4B is reached in the water tub 1 .
- the water level L 1 is previously set according to an amount of laundry detected at step S 2 .
- the drum 2 is rotated at low speeds (40 rpm, for example) repeatedly alternately in the normal and reverse directions, whereby preliminary washing is carried out. As a result, laundry in the drum 2 is lifted up by baffles and caused to fall down, so that the laundry is tumbled repeatedly thereby to be cleaned.
- the water level L 1 for the preliminary washing is set to be lower than a water level of normal washing. Accordingly, wash liquid made by dissolution of detergent into water in the water tub 1 has a higher density than usual wash liquid. Furthermore, the temperature of the water supplied into the water tub 1 is increased by heat stored in the laundry, water tub 1 and drum 2 heated by the preliminary washing. Consequently, a high cleaning action can be obtained from the preliminary washing.
- step S 8 Upon completion of the preliminary washing, the control device 20 advances to step S 8 to execute a second water supply.
- water is added into the water tub 1 so that a water level L 2 as shown in FIG. 4C is reached in the water tub 1 .
- the water level L 2 is previously set according to an amount of laundry detected at step S 2 and corresponds to a water level in the normal washing operation.
- step S 9 the drum 2 is rotated at a low speed (40 rpm, for example) repeatedly alternately in the normal and reverse directions so that a main washing is executed. As a result, laundry in the drum 2 is lifted up by baffles and caused to fall down, so that the laundry is tumbled repeatedly thereby to be cleaned.
- the water level in the main washing is set to the normal water level as described above, a normal cleaning action can be obtained.
- water level in the water tub 1 is reduced below L 2 for the reason of absorption of water by laundry or the like, water is supplied into the wash tub 1 for compensation until water level L 2 is reached.
- steps S 6 through S 9 constitute a wash step in the embodiment.
- the drain valve 11 is opened so that water is discharged from the water tub 1 (step S 10 ).
- the drum 2 is rotated at high speeds, for example, 800 rpm so that laundry is centrifugally dehydrated (step S 1 ).
- a rinse step (step S 12 ), dehydration step (step S 13 ) and drying step (step S 14 ) are sequentially executed and thereafter, the washing operation is completed.
- the heater element 27 and fan motor 28 are energized and the water pouring operation is carried out by the water pouring unit 6 in the same manner as in the preliminary washing.
- warm air supplied into the drum 2 absorbs moisture from laundry.
- the warm air containing moisture is dehumidified by the heat exchanger 5 and heated by the heater unit 8 again.
- the warm air is returned into the drum 2 so that laundry is dried.
- FIG. 5 shows the relationship among a water temperature detected by the temperature sensor 15 , a temperature in the water tub 1 detected by the temperature sensor 15 and a target temperature of laundry, for every amount of laundry.
- the target temperature of laundry is set in a range from 45° C. to 55° C. according to a water temperature as shown in FIG. 5 .
- the target laundry temperature is thus set in order that a protein component, such as blood, milk or egg, which is one of soil components adherent to laundry may be prevented from being hardened by the preheating operation. Since the protein component is hardened at about 60° C., the target temperature is set so as to be lower than 60° C.
- the target laundry temperature is set in the above-described manner in order that a temperature difference between laundry and water supplied into the water tub 1 in the first water supply may be rendered small for prevention of cloth shrinkage of laundry.
- a temperature of water supplied into the water tub 1 in the first water supply is substantially equal to a water temperature detected by the temperature sensor 15 in the preliminary washing. Accordingly, a target temperature is set to be low when the water temperature detected by the temperature sensor 15 is low, whereas the target temperature is set to be high when the detected water temperature is high.
- the control device 20 estimates a target temperature of laundry from the water-tub interior temperature detected by the temperature sensor 14 .
- the relationship between the water-tub interior temperature and the laundry target temperature was obtained from an experiment conducted by the inventor. Accordingly, when the temperature detected by the temperature sensor 14 has reached the water-tub interior temperature as shown in FIG. 5 , the control device 20 determines that the laundry has reached a target temperature, finishing the preliminary heating.
- a target temperature of laundry is higher by 2° C. to 15° C. than the water-tub interior temperature as shown in FIG. 5 .
- the preheating is carried out when no water is reserved in the water tub 1 before execution of the wash step.
- warm air is supplied into the drum 2 so that laundry, water tub 1 and drum 2 are heated.
- Water reserved in the water tub 1 is heated in the wash step by making use of heat stored in the laundry, water tub 1 and drum 2 as the result of the preheating. Consequently, heat can be transferred from warm air to the water in the water tub 1 more efficiently as compared with the construction that water in the water tub is directly heated by warm air.
- the preheating is carried out making a direct use of the heater unit 8 and blowing fan unit 8 which constitute the drying function of the washing machine. Accordingly, since no new equipment is necessitated for the preheating, the construction of the washing machine can be prevented from complication and the production cost of the washing machine can be prevented from increase.
- Water is poured by the water pouring unit 6 in the reheating so that warm air supplied into the water tub 1 is rendered moist. Consequently, laundry can be prevented from being excessively dried in the preheating, whereupon soil can be prevented from becoming difficult to wash off.
- the target temperature of laundry which is a temperature of laundry in the termination of the preheating, is set to be equal to or lower than 60° C. Consequently, the protein component, which is a soil component of laundry, can be prevented from being hardened. Moreover, the target temperature of laundry is rendered low when the temperature of water is high, whereas the target temperature is rendered high when the water temperature is high. Consequently, since the temperature difference between the laundry heated and the water supplied into the water tub 1 is reduced, the laundry can be prevented from shrinkage or damage.
- FIGS. 6 and 7 illustrate a second embodiment of the invention.
- the preheating is executed while a small amount of water is reserved on the bottom of the water tub 1 .
- the drain valve 11 is adapted to be closed during the water pouring in the preheating (see step S 3 in the flowchart of FIG. 3 ). Accordingly, water poured into the heat exchanger 5 is reserved in the circulation passage 4 and also flows through the warm-air outlet 1 a into the water tub 1 thereby to be reserved in the water tub.
- the water pouring is carried out until the water reserved in the water tub 1 reaches such a level that the water reserved in the water tub is kept away from contact with the drum 2 and that the water reserved in the water tub does not prevent warm air from passing through the circulation passage 4 .
- the aforesaid water level is designated by symbol “L 3 ” in FIGS. 6 and 7 .
- the target temperature of laundry in the preheating may be constant irrespective of the temperature of water poured from the water pouring unit 6 when the washing machine is installed in an environment where temperature changes are small throughout the year and changes in the ambient temperature need not be taken into consideration.
- the target temperature for example, as shown in FIG. 8 .
- the temperature sensor 15 may be eliminated in the aforesaid arrangement.
- the water pouring by the water pouring unit 6 need not be carried out continuously throughout the preheating.
- the water pouring may be carried out intermittently or for a short period of the preheating.
- a water pouring time may be controlled according to an amount of laundry or the like. Consequently, warm air can contain moisture.
- the water supply (first water supply) before the preliminary wash may be carried out until a normal water level is reached.
- the water level is reduced in the first washing operation (that is, the preliminary wash) since the dried laundry absorbs water.
- additional water supply is usually carried out until a set water level is reached in the middle of the washing operation, whereby the lowered water level is returned to the former state. Accordingly, even when the water level for the preliminary wash is set to the normal water level, substantially the same effect can be achieved as the case where the water level is set so as to be lower than the normal water level without execution of additional water supply.
- the invention may be applied to a washing machine with drying function, which is provided with a rotating tub rotated about a vertical axis.
Abstract
Description
- This application is based upon and claims the benefit of priority from the prior Japanese Patent Application No. 2005-12671, filed on Jan. 20, 2005, the entire contents of which are incorporated herein by reference.
- 1. Field of the Invention
- The present invention relates to a washing machine having a drying function and provided with a warm-air generator.
- 2. Description of the Related Art
- A drum washing machine with a drying function can provide effective washing action while reserving a relatively smaller amount of water in a lower interior of a water tub or drum, for example. Accordingly, the aforesaid drum washing machine can achieve water saving. Furthermore, laundry is vertically moved in a drum when the drum is rotated. When warm air is supplied into the drum, the entire laundry can efficiently be dried while being agitated. The above-described type drum washing machine with the drying function has recently been diffused rapidly.
- On the other hand, in order that a sufficient cleaning performance may be achieved from a small amount of wash water, some types of the foregoing drum washing machines have recently been designed so that wash water is warmed to accelerate activation of enzyme contained in a detergent. A method of warming wash water includes heating wash water by a sheathed heater disposed on a bottom of a wash tub, and introducing, into a drum, warm air produced by a warm-air supplier comprising a fan and a heater so that wash water is heated. JP-A-2-277494 discloses the construction of a drum washing machine of the aforesaid type, for example.
- However, in the aforesaid method using the sheathed heater, on one hand, the sheathed heater disposed in the water needs to be provided with a safety arrangement against electric leakage. On the other hand, in the method using the warm-air supplier, both wash water and warm air are fluid and accordingly, thermal conduction from warm air to wash water has a low efficiency, whereupon it takes a lot of time to warm overall wash water in the drum.
- Therefore, an object of the present invention is to provide a washing machine with a drying function, in which wash water can be heated by a simple construction efficiently.
- The present invention provides a washing machine with a drying function, comprising a water tub, a rotating tub provided in the water tub so as to be rotatable, a driver rotating the rotating tub, a circulation passage defined so as to communicate with the water tub, a warm-air supply unit circularly supplying warm air through the circulation passage into the water tub and the rotating tub, a water-supply unit supplying water into the water tub, a control unit controlling the driver, the warm-air supply unit and the water-supply unit thereby to be capable of controlling wash, rinse, dehydration and drying steps, and a preheating unit executing a preheating operation in which warm air is supplied into the water tub and the rotating tub during rotation of the rotating tub before the wash step is executed.
- The preheating operation is carried out before the wash step is carried out and when no water is reserved in the water tub. Accordingly, warm air is supplied into the water tub and the rotating tub so that heat is directly applied to laundry, the water tub and the rotating tub. Water reserved in the water tub in the wash tub subsequently to the preheating is warmed by making use of heat stored in the laundry, water tub and rotating tub by the preheating. Consequently, heat can be conducted from the warm air to water in the water tub more efficiently as compared with the construction that water in the water tub is directly heated by warm air.
- Other objects, features and advantages of the present invention will become clear upon reviewing the following description of the embodiment with reference to the accompanying drawings, in which:
-
FIG. 1 is a schematic front view of a drum washing machine with a drying function in accordance with a first embodiment of the present invention; -
FIG. 2 is a schematic block diagram showing an electrical arrangement of the washing machine; -
FIG. 3 is a flowchart showing a washing operation; -
FIGS. 4A to 4C illustrate water levels in a water tub and motion of laundry in a preheating, preliminary washing and main washing respectively; -
FIG. 5 is a graph showing the relationship between an amount of laundry and a water temperature, a temperature in a water tub and a target laundry temperature; -
FIG. 6 is a view similar toFIG. 1 , showing a second embodiment of the invention; -
FIG. 7 is a view similar toFIG. 4A ; and -
FIG. 8 is a graph showing the relationship between an amount of laundry, and a temperature in a water tub and a target laundry temperature in a modified form of the first embodiment. - A first embodiment of the present invention will be described with reference to FIGS. 1 to 5. Referring to
FIG. 1 , a washing machine with a drying function includes a generallycylindrical water tub 1 and a generally cylindrical rotating tub ordrum 2 mounted in the water tub. Thewater tub 1 is elastically supported by elastic supporting units (not shown). Thewater tub 1 is substantially non-porous and accordingly enables to reserve water. Thedrum 2 serves as a washing tub, dehydrating tub and drying tub and has a number of through-holes 2 a formed through a circumferential wall thereof. Thedrum 2 further has a plurality of baffles (not shown). - A
brushless DC motor 3 of the outer rotor type (serving as a driver) is mounted on a left side of thewater tub 1, for example. Themotor 3 has arotational shaft 3 a horizontally extending through a hole (not shown) of thewater tub 1 to be connected to a central left side of thedrum 2. Thus, thedrum 2 is rotated with a rotor (not shown) of themotor 3. Asupport shaft 2 b coaxial with therotational shaft 3 a protrudes from a side of thedrum 2 opposed to themotor 3 and is rotatably supported on the corresponding side of thewater tub 1. Thedrum 2 is thus rotated about a substantially horizontal axis. - The
water tub 1 has a peripheral wall including an upper part formed with an access opening (not shown) through which laundry is put into and taken out of thedrum 2. Thedrum 2 has an opening (not shown) corresponding to the access opening. Thedrum 2 is controlled so as normally to stop with the opening being located at an upper part of the drum so that laundry can be put into and taken out of thedrum 2 through the upper part of the drum. - A
circulation passage 4 with a duct structure is defined on the right of thewater tub 1. Thewater tub 1 has a warm-air outlet 1 a formed through a lower right portion thereof. Thecirculation passage 4 has one end connected to the warm-air outlet 1 a. Thewater tub 1 also has warm-air inlets 1 b formed through a potion of thewater tub 1 around thesupport shaft 2 b mounted on the right side of the water tub. Thedrum 2 also hasopenings 2 c formed through a portion of thedrum 2 around thesupport shaft 2 b so that the openings correspond to the warm-air inlets 1 b respectively. Thecirculation passage 4 has the other end connected to the warm-air inlet 1 b. - A water-cooled
heat exchanger 5 is provided in the middle of thecirculation passage 4. Awater pouring unit 6 is provided in an upper portion of theheat exchanger 5 for pouring water into an interior of the heat exchanger. A blowingfan unit 7 and aheater unit 8 are provided in an upper interior of thecirculation passage 4 located over theheat exchanger 5. When the blowingfan unit 7 and theheater unit 8 are driven, air in thecirculation passage 4 is heated so that warm air is produced. The warm air is caused to flow in a direction of arrow A inFIG. 1 by the blowing action of the blowingfan unit 7 to be supplied through the warm-air inlets 1 b and openings 1 c into thewater tub 1 and thedrum 2. The warm air supplied into thedrum 2 flows through theholes 2 a into thewater tub 1, returning through the warm-air outlets 1 a into thecirculation passage 4. The warm air is then caused to flow upward through theheat exchanger 5. Thus the warm air is circulated repeatedly. The blowingfan unit 7 andheater unit 8 serve as warm-air supply unit in the embodiment. - A
drain hole 9 is formed in the bottom of thewater tub 1. Adrain hose 10 is connected via adrain valve 11 to thedrain hole 9. Anoverflow port 12 is formed in the right side of thewater tub 1 so as to be located below the warm-air inlet 1 b. Anoverflow hose 13 is connected to theoverflow port 12. Theoverflow hose 13 is further connected to thedrain hose 10 downstream with respect to thedrain valve 11. - A
temperature sensor 14 is mounted on a portion of the right side inner face of thewater tub 1 located just over theoverflow port 12. Thetemperature sensor 14 comprises a thermistor and detects a temperature in thewater tub 1. Anothertemperature sensor 15 is provided in the lower interior of theheat exchanger 5. Thetemperature sensor 15 also comprises a thermistor and detects a temperature of water supplied from thewater pouring unit 6. Thetemperature sensor 14 serves as a laundry temperature sensor, whereas thetemperature sensor 15 serves an ambient temperature sensor. -
FIG. 2 shows an electrical arrangement of the washing machine. Acontrol device 20 comprises a microcomputer and serves as a control unit for controlling an overall operation of the washing machine and a preheating unit. Connected to thecontrol device 20 are aswitch input section 21, awater level sensor 22, arotation sensor 23 and theaforesaid temperature sensors switch input section 21 delivers a detection signal (operation signal) according to an amount of operation of an operation switch (not shown). Thewater level sensor 22 delivers a detection signal according to a water level in thewater tub 1. Therotation sensor 23 delivers a detection signal according to a rotational speed of themotor 3. - The
motor 3 is connected via aninverter circuit 24 to thecontrol device 20. A water-supply valve 26 (a water-supply unit), aheater element 27, afan motor 28, thedrain valve 11 are connected via adrive circuit 25 to thecontrol device 20. The water-supply valve 26 switches a water supply path between a water-supply path extending from a tap (not shown) of the water service to thewater pouring unit 6 and a water-supply path extending from the tap to thewater tub 1. Theheater element 27 constitutes theheater unit 8, and thefan motor 28 constitutes the blowingfan unit 7. Thecontrol device 20 controls themotor 3, water-supply valve 26,heater element 27,fan motor 28 anddrain valve 11 based on a control program previously stored therein. - The operation of the washing machine will now be described.
FIG. 3 is a flowchart showing processing for a standard washing/drying operation. Upon start of operation, thedrain valve 11 is opened so that a draining operation is carried out (step S1). Consequently, even when water is present in thewater tub 1 upon start of the operation, all the water is discharged from thewater tub 1. At subsequent step S2, the weight of laundry in thedrum 2 is detected. Subsequently, the water-supply valve 26 is switched at step S3 so that the water-supply path leading to thewater pouring unit 6 is opened. As a result, thewater pouring unit 6 starts a water pouring operation. Since thedrain valve 11 is open in this case, water supplied into theheat exchanger 5 is discharged from thedrain hole 9 without being reserved. At step S4, thedrum 2 is rotated, for example, at 400 rpm. At step S5, theheater element 27 and thefan motor 28 are energized, so that warm air flows through thecirculation passage 4 to be supplied into thewater tub 1. - The steps S3, S4 and S5 are carried out substantially simultaneously. More specifically, warm air is circulated through the
circulation passage 4 supplied with water and therotating drum 2. Consequently, moisturized warm air is supplied into thedrum 2 and thewater tub 1 so that heat is applied to laundry in thedrum 2 as well as to thedrum 2 and thewater tub 1. Accordingly, the treatment at steps S3 to S5 constitutes a preheating. Since thedrain valve 11 is open in the preheating operation, water is discharged through thedrain hole 9 without being reserved. Accordingly, a part of thecirculation passage 4 near the warm-air outlet 1 a can be prevented from being closed by water, or water can be prevented from entering thedrum 2. - A rotational speed of the
drum 2 at step S4 is set to about 400 rpm in the embodiment. The reason for this setting is as follows: an experiment conducted by the inventors shows that a centrifugal force starts acting upon laundry and warm air in thedrum 2 when a rotational speed of thedrum 2 exceeds about 300 rpm and that the centrifugal force moves laundry in the drum uniformly to an inner peripheral surface of thedrum 2 as shown inFIG. 4A when the rotational speed of thedrum 2 ranges from 400 rpm to 500 rpm (symbol “W” inFIG. 4 designates laundry) Furthermore, warm air flowing into the central interior of thedrum 2 is also caused to flow toward the peripheral wall of thedrum 2 by the centrifugal force as shown by arrow inFIG. 1B . On the other hand, noise is produced when the rotational speed of thedrum 2 exceeds about 400 rpm. In view of the above drawback, the rotational speed of thedrum 2 is set so that warm air is blown against the whole laundry uniformly while noise production is restrained. - The above-described preheating finishes when the temperature of laundry in the
drum 2 has reached a target temperature. Thecontrol device 20 reads the detection signals of thetemperature sensors control device 20 estimates a target temperature of the laundry based on the read detection signal of thetemperature sensor 14. Furthermore, thecontrol device 20 is arranged to change the target temperature of laundry according to an amount of laundry and the detection signal of thetemperature sensor 15. The relationship among the target temperature of the laundry, the amount of laundry and detection temperatures oftemperature sensors - Upon completion of the preheating operation, the
control device 20 advances to step S6 to execute a first water-supply. The water-supply valve 26 is switched in the first water-supply so that the water-supply path from the tap to thewater tub 1 is opened, whereupon water is supplied into thewater tub 1. In this case, water is adapted to be supplied through a detergent case (not shown) into thewater tub 1. As a result, detergent contained in the detergent case is supplied into thewater tub 1 with the water. The first water supply is carried out until a water level as shown by “L1” inFIG. 4B is reached in thewater tub 1. The water level L1 is previously set according to an amount of laundry detected at step S2. Thedrum 2 is rotated at low speeds (40 rpm, for example) repeatedly alternately in the normal and reverse directions, whereby preliminary washing is carried out. As a result, laundry in thedrum 2 is lifted up by baffles and caused to fall down, so that the laundry is tumbled repeatedly thereby to be cleaned. - The water level L1 for the preliminary washing is set to be lower than a water level of normal washing. Accordingly, wash liquid made by dissolution of detergent into water in the
water tub 1 has a higher density than usual wash liquid. Furthermore, the temperature of the water supplied into thewater tub 1 is increased by heat stored in the laundry,water tub 1 anddrum 2 heated by the preliminary washing. Consequently, a high cleaning action can be obtained from the preliminary washing. - Upon completion of the preliminary washing, the
control device 20 advances to step S8 to execute a second water supply. In the second water supply, water is added into thewater tub 1 so that a water level L2 as shown inFIG. 4C is reached in thewater tub 1. The water level L2 is previously set according to an amount of laundry detected at step S2 and corresponds to a water level in the normal washing operation. At step S9, thedrum 2 is rotated at a low speed (40 rpm, for example) repeatedly alternately in the normal and reverse directions so that a main washing is executed. As a result, laundry in thedrum 2 is lifted up by baffles and caused to fall down, so that the laundry is tumbled repeatedly thereby to be cleaned. Since the water level in the main washing is set to the normal water level as described above, a normal cleaning action can be obtained. When the water level in thewater tub 1 is reduced below L2 for the reason of absorption of water by laundry or the like, water is supplied into thewash tub 1 for compensation until water level L2 is reached. - The above-described steps S6 through S9 constitute a wash step in the embodiment. Upon completion of the main washing, the
drain valve 11 is opened so that water is discharged from the water tub 1 (step S10). Successively, thedrum 2 is rotated at high speeds, for example, 800 rpm so that laundry is centrifugally dehydrated (step S1). Subsequently, a rinse step (step S12), dehydration step (step S13) and drying step (step S14) are sequentially executed and thereafter, the washing operation is completed. In the drying step, theheater element 27 andfan motor 28 are energized and the water pouring operation is carried out by thewater pouring unit 6 in the same manner as in the preliminary washing. As a result, warm air supplied into thedrum 2 absorbs moisture from laundry. The warm air containing moisture is dehumidified by theheat exchanger 5 and heated by theheater unit 8 again. The warm air is returned into thedrum 2 so that laundry is dried. - The following describes the relationship among a target laundry temperature, an amount of laundry and temperatures detected by the
temperature sensors FIG. 5 shows the relationship among a water temperature detected by thetemperature sensor 15, a temperature in thewater tub 1 detected by thetemperature sensor 15 and a target temperature of laundry, for every amount of laundry. The target temperature of laundry is set in a range from 45° C. to 55° C. according to a water temperature as shown inFIG. 5 . The target laundry temperature is thus set in order that a protein component, such as blood, milk or egg, which is one of soil components adherent to laundry may be prevented from being hardened by the preheating operation. Since the protein component is hardened at about 60° C., the target temperature is set so as to be lower than 60° C. so that the protein component can be prevented from being hardened, sticking to a fiber of laundry. Secondly, the target laundry temperature is set in the above-described manner in order that a temperature difference between laundry and water supplied into thewater tub 1 in the first water supply may be rendered small for prevention of cloth shrinkage of laundry. A temperature of water supplied into thewater tub 1 in the first water supply is substantially equal to a water temperature detected by thetemperature sensor 15 in the preliminary washing. Accordingly, a target temperature is set to be low when the water temperature detected by thetemperature sensor 15 is low, whereas the target temperature is set to be high when the detected water temperature is high. - Furthermore, the
control device 20 estimates a target temperature of laundry from the water-tub interior temperature detected by thetemperature sensor 14. The relationship between the water-tub interior temperature and the laundry target temperature was obtained from an experiment conducted by the inventor. Accordingly, when the temperature detected by thetemperature sensor 14 has reached the water-tub interior temperature as shown inFIG. 5 , thecontrol device 20 determines that the laundry has reached a target temperature, finishing the preliminary heating. A target temperature of laundry is higher by 2° C. to 15° C. than the water-tub interior temperature as shown inFIG. 5 . It is considered that warm air flows through the warm-air inlet 1 b into thewater tub 1 anddrum 2 during the preheating and the temperature of warm air is detected by thetemperature sensor 14 after heat has been absorbed by laundry,water tub 1 anddrum 2. Accordingly, the difference between the laundry temperature and the temperature detected by thetemperature sensor 14 tends to be larger as an amount of laundry is large. - According to the foregoing embodiment, the preheating is carried out when no water is reserved in the
water tub 1 before execution of the wash step. In the preheating, warm air is supplied into thedrum 2 so that laundry,water tub 1 anddrum 2 are heated. Water reserved in thewater tub 1 is heated in the wash step by making use of heat stored in the laundry,water tub 1 anddrum 2 as the result of the preheating. Consequently, heat can be transferred from warm air to the water in thewater tub 1 more efficiently as compared with the construction that water in the water tub is directly heated by warm air. - Furthermore, the preheating is carried out making a direct use of the
heater unit 8 and blowingfan unit 8 which constitute the drying function of the washing machine. Accordingly, since no new equipment is necessitated for the preheating, the construction of the washing machine can be prevented from complication and the production cost of the washing machine can be prevented from increase. - Water is poured by the
water pouring unit 6 in the reheating so that warm air supplied into thewater tub 1 is rendered moist. Consequently, laundry can be prevented from being excessively dried in the preheating, whereupon soil can be prevented from becoming difficult to wash off. - The target temperature of laundry, which is a temperature of laundry in the termination of the preheating, is set to be equal to or lower than 60° C. Consequently, the protein component, which is a soil component of laundry, can be prevented from being hardened. Moreover, the target temperature of laundry is rendered low when the temperature of water is high, whereas the target temperature is rendered high when the water temperature is high. Consequently, since the temperature difference between the laundry heated and the water supplied into the
water tub 1 is reduced, the laundry can be prevented from shrinkage or damage. -
FIGS. 6 and 7 illustrate a second embodiment of the invention. The following describes only the differences of the second embodiment from the first embodiment. In the second embodiment, identical or similar parts are labeled by the same reference symbols as those in the first embodiment. In the second embodiment, the preheating is executed while a small amount of water is reserved on the bottom of thewater tub 1. More specifically, thedrain valve 11 is adapted to be closed during the water pouring in the preheating (see step S3 in the flowchart ofFIG. 3 ). Accordingly, water poured into theheat exchanger 5 is reserved in thecirculation passage 4 and also flows through the warm-air outlet 1 a into thewater tub 1 thereby to be reserved in the water tub. The water pouring is carried out until the water reserved in thewater tub 1 reaches such a level that the water reserved in the water tub is kept away from contact with thedrum 2 and that the water reserved in the water tub does not prevent warm air from passing through thecirculation passage 4. The aforesaid water level is designated by symbol “L3” inFIGS. 6 and 7 . As the result of the above-described construction, too, moist warm air can be supplied into thewater tub 1 in the preheating. - The invention should not be limited to the foregoing embodiments. The embodiments may be modified as follows. For example, the target temperature of laundry in the preheating may be constant irrespective of the temperature of water poured from the
water pouring unit 6 when the washing machine is installed in an environment where temperature changes are small throughout the year and changes in the ambient temperature need not be taken into consideration. In this case, for example, as shown inFIG. 8 , it is determined that the laundry has reached the target temperature, whereupon the preheating is finished. The determination is based on that the temperature detected by thetemperature sensor 14 has reached a previously determined water-tub interior temperature previously set for every amount of laundry. Thetemperature sensor 15 may be eliminated in the aforesaid arrangement. - The water pouring by the
water pouring unit 6 need not be carried out continuously throughout the preheating. The water pouring may be carried out intermittently or for a short period of the preheating. Furthermore, a water pouring time may be controlled according to an amount of laundry or the like. Consequently, warm air can contain moisture. - The water supply (first water supply) before the preliminary wash may be carried out until a normal water level is reached. The water level is reduced in the first washing operation (that is, the preliminary wash) since the dried laundry absorbs water. Then, additional water supply is usually carried out until a set water level is reached in the middle of the washing operation, whereby the lowered water level is returned to the former state. Accordingly, even when the water level for the preliminary wash is set to the normal water level, substantially the same effect can be achieved as the case where the water level is set so as to be lower than the normal water level without execution of additional water supply.
- The invention may be applied to a washing machine with drying function, which is provided with a rotating tub rotated about a vertical axis.
- The foregoing description and drawings are merely illustrative of the principles of the present invention and are not to be construed in a limiting sense. Various changes and modifications will become apparent to those of ordinary skill in the art. All such changes and modifications are seen to fall within the scope of the invention as defined by the appended claims.
Claims (7)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2005012671A JP2006198149A (en) | 2005-01-20 | 2005-01-20 | Washing machine with drying function |
JP2005-12671 | 2005-01-20 |
Publications (1)
Publication Number | Publication Date |
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US20060156766A1 true US20060156766A1 (en) | 2006-07-20 |
Family
ID=36682436
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US11/335,555 Abandoned US20060156766A1 (en) | 2005-01-20 | 2006-01-20 | Washing machine with drying function |
Country Status (4)
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US (1) | US20060156766A1 (en) |
JP (1) | JP2006198149A (en) |
CN (1) | CN1807746B (en) |
TW (1) | TW200643256A (en) |
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US20100242549A1 (en) * | 2007-11-07 | 2010-09-30 | Kabushiki Kaisha Toshiba | Inverter device for washing machine |
US20100307201A1 (en) * | 2007-11-05 | 2010-12-09 | Tsuyoshi Shiga | Washing machine |
US20120030959A1 (en) * | 2010-08-09 | 2012-02-09 | Tai-Her Yang | Rotary drum dryer with heat recycling and water collecting function |
EP2570548A1 (en) * | 2011-09-19 | 2013-03-20 | Electrolux Home Products Corporation N.V. | A washer-dryer with at least one condenser |
US20130200834A1 (en) * | 2012-02-07 | 2013-08-08 | Youngsuk Kim | Controlling method of laundry device |
WO2019045446A1 (en) * | 2017-08-29 | 2019-03-07 | Samsung Electronics Co., Ltd. | Washing machine and control method thereof |
KR20190024573A (en) * | 2017-08-29 | 2019-03-08 | 삼성전자주식회사 | Washing apparatus, and control method for the same |
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JP4668945B2 (en) * | 2007-04-24 | 2011-04-13 | 三菱電機株式会社 | Washing machine |
EP2390397A1 (en) * | 2010-05-25 | 2011-11-30 | Electrolux Home Products Corporation N.V. | A method for operating a washing cycle and a subsequent drying cycle in a laundry washer-dryer |
JP5762063B2 (en) * | 2011-03-11 | 2015-08-12 | シャープ株式会社 | Washing and drying machine |
JP5296170B2 (en) * | 2011-09-09 | 2013-09-25 | 株式会社東芝 | Drum washing machine |
JP5300946B2 (en) * | 2011-09-09 | 2013-09-25 | 株式会社東芝 | Drum washing machine |
JP5599932B2 (en) * | 2013-12-27 | 2014-10-01 | 日立アプライアンス株式会社 | Washing and drying machine |
CN105648709B (en) * | 2014-12-01 | 2017-12-22 | 无锡小天鹅股份有限公司 | Washing machine and its clothing warming by fire control device and control method |
JP2017189484A (en) * | 2016-04-15 | 2017-10-19 | 日立アプライアンス株式会社 | Washing and drying machine |
JP2017185191A (en) * | 2016-09-08 | 2017-10-12 | 日立アプライアンス株式会社 | Washing and drying machine |
JP6706735B2 (en) * | 2016-09-27 | 2020-06-10 | パナソニックIpマネジメント株式会社 | Washing machine |
CN110106661B (en) * | 2018-02-01 | 2023-06-23 | 青岛海尔洗涤电器有限公司 | Household appliance control method and household appliance |
KR20210009963A (en) * | 2019-07-18 | 2021-01-27 | 삼성전자주식회사 | Washing machine and controlling method thereof |
TR202022219A2 (en) * | 2020-12-29 | 2022-07-21 | Vestel Beyaz Esya Sanayi Ve Ticaret Anonim Sirketi | A working method for washer and dryer devices. |
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- 2006-01-20 CN CN2006100059636A patent/CN1807746B/en not_active Expired - Fee Related
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US20120030959A1 (en) * | 2010-08-09 | 2012-02-09 | Tai-Her Yang | Rotary drum dryer with heat recycling and water collecting function |
US20140338404A1 (en) * | 2011-09-19 | 2014-11-20 | Electrolux Home Products Corporation N.V. | Washer-Dryer With At Least One Condenser |
WO2013041513A1 (en) * | 2011-09-19 | 2013-03-28 | Electrolux Home Products Corporation N.V. | A washer-dryer with at least one condenser |
EP2570548A1 (en) * | 2011-09-19 | 2013-03-20 | Electrolux Home Products Corporation N.V. | A washer-dryer with at least one condenser |
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US20130200834A1 (en) * | 2012-02-07 | 2013-08-08 | Youngsuk Kim | Controlling method of laundry device |
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WO2019045446A1 (en) * | 2017-08-29 | 2019-03-07 | Samsung Electronics Co., Ltd. | Washing machine and control method thereof |
KR20190024573A (en) * | 2017-08-29 | 2019-03-08 | 삼성전자주식회사 | Washing apparatus, and control method for the same |
US10900161B2 (en) | 2017-08-29 | 2021-01-26 | Samsung Electronics Co., Ltd. | Washing machine and control method thereof |
US11512420B2 (en) | 2017-08-29 | 2022-11-29 | Samsung Electronics Co., Ltd. | Washing machine and control method thereof |
KR102572096B1 (en) * | 2017-08-29 | 2023-08-30 | 삼성전자주식회사 | Washing apparatus, and control method for the same |
Also Published As
Publication number | Publication date |
---|---|
TW200643256A (en) | 2006-12-16 |
CN1807746A (en) | 2006-07-26 |
CN1807746B (en) | 2012-02-22 |
JP2006198149A (en) | 2006-08-03 |
TWI341344B (en) | 2011-05-01 |
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