WO2007128641A1

WO2007128641A1 - Condensation dryer having a process-air coil, and method for drying in a condensation dryer of this type

Info

Publication number: WO2007128641A1
Application number: PCT/EP2007/053500
Authority: WO
Inventors: Oliver Despang
Original assignee: BSH Bosch und Siemens Hausgeräte GmbH
Priority date: 2006-05-10
Filing date: 2007-04-11
Publication date: 2007-11-15
Also published as: DE502007003089D1; DE102006021828A1; EP2024552B1; EP2024552A1; ATE460526T1

Abstract

The invention relates to a condensation dryer 1 having a drying chamber (2) and a process-air circuit 3, 4, 5 for circulating process air through the drying chamber 2. The process-air circuit 3, 4, 5 leads from the drying chamber 2 first of all to a condenser 10 for cooling the process air, separating water from the process air and collecting the water in a first collecting vessel 11, then to a first fan 7, 20 for driving the process air, then to a heater 13 for heating the process air and then to the drying chamber 2 again. The first fan 7, 20 has a rotor 7 and a stator 20 which is configured as a process-air coil 20. According to the invention, a guiding arrangement 12, 17, 19 is formed between the process-air coil 20 and the first collecting vessel, through which guiding arrangement 12, 17, 19 water can be transported from the fan 7, 20 into the first collecting vessel 11. In the method according to the invention for drying laundry in a condensation dryer 1 of this type, water which is accumulated in the process-air coil 20 is transported through the guiding arrangement 12, 17, 19 into the first collecting vessel 11 by means of a pressure difference which is produced between the condenser 20 and the fan 7, 20.

Description

Condensation dryer with a process air spiral, and method for drying in such a condensation dryer

The invention relates to a condensation dryer having a drying chamber and a process air circuit for circulating process air through the drying chamber, wherein the process air circuit from the drying chamber first to a condenser for cooling the process air, separating water from the process air and collecting the water in a first collecting vessel, thereafter to a first fan for driving the process air, then to a heater for heating the process air and then back to the drying chamber, and wherein the first fan has a rotor and a stator formed as a process air spiral. Likewise, the invention relates to a method for drying laundry in such a condensation dryer.

In a condensation dryer (condensation dryer) work generally a closed hot air circuit (process air circuit) and an open cooling air flow. In the hot air circulation, the laundry to be dried is heated by means of flowing process air, the water being absorbed and transported to a heat exchanger (condenser). There, the water contained in the process air condenses due to cooling with the cooling air and is separated from the process air and collected in a condensate tank. The dehumidified process air is reheated by a heating unit and then passed through the laundry to be dried again. In a condensation dryer is generally a process air blower, in the lower part of which the wet laundry entzogener enriched. This is especially true when the condensation dryer is at a standstill. The lower part of the process air blower, by design, is generally lower than the condensate tank used to catch the water from the process air used to dry the wet laundry.

A blower in a spiral housing, in particular for use in a condensation dryer, is apparent from EP 1 046 822 B1, EP 0 702 105 B1 or U.S. Patent 5,915,922. A condenser for a condensation dryer is described in EP 1 050 618 B1.

The object of the invention is therefore to provide a condensation dryer and a method in which the water accumulating in the process air blower can be removed and, in particular, transferred to a condensate container for disposal by an operator.

Accordingly, the condensation dryer according to claim 1 and the method according to claim 7 have been invented. Preferred embodiments are listed in dependent claims.

The condensation dryer according to the invention with a drying chamber and a process air circuit for circulating process air through the drying chamber, wherein the process air circuit from the drying chamber first to a condenser for cooling the process air, separating water from the process air and collecting the water in a first collecting vessel, then to a first blower for driving the process air, then to a heater for heating the process air and then leads back to the drying chamber, and wherein the first fan has a rotor and a stator formed as a process air spiral, characterized in that between the process air spiral and the first collecting vessel a guide arrangement is formed, through which water from the fan can be transported into the first collecting vessel.

The inventive method for drying laundry with such a condensation dryer is characterized by water, which collects in the process air spiral, formed by the between the process air coil and the first collecting vessel guide assembly by means of an adjusting between the condenser and the fan pressure difference in the first Collecting vessel is transported.

Preference is given to a condensation dryer in which the guide arrangement has an opening in the process air spiral, a second one communicating with the fan via the latter Collecting vessel, in which water from the process air spiral can drip, and a communicating with the second receptacle and the first receptacle pipe socket comprises. In this embodiment, water that enters the process air spiral, drip easily into the second receptacle, so that the process air coil can be kept largely dry. The second collecting vessel is brought through a pipe socket in the necessary communication with the first collecting vessel, so that a structurally possibly required height difference between the process air coil and the condenser or communicating with this first collecting vessel can be bridged, taking advantage of a pressure difference between suction and Pressure side of the blower. Furthermore, a condensation dryer is preferred in which the opening is located at the vertically lowest point of the process air spiral.

The condensation dryer according to the invention may be a dryer with or without a heat pump cycle.

Also preferred is a condensation dryer in which the first blower is a centrifugal blower.

A particularly preferred condensation dryer is characterized in that the first collecting vessel communicates with a condensate container above it for collecting the water. In such a condensate container, collected condensate including the water carried from the process air coil can be easily provided for disposal by an operator.

A likewise particularly preferred condensation dryer has an open or closed cooling air duct, through which the condenser can be supplied with cooling air from an environment of the condensation dryer by means of a second blower and led out of the condensation dryer after cooling the process air. At standstill of the condensation dryer, ie at standstill of the stator or fan wheel in the first fan, prevails atmospheric pressure in the lower region or at the lowest point of the process air spiral. When you turn on the condensation dryer and thus the fan in the fan, however, in the flow direction of the process air in front of the blower (fan wheel) is a negative pressure, while behind there is an overpressure.

The invention has numerous advantages. So there is no condensate in the

Process air spiral. The condensate water does not collect in the

Process air spiral, but is centrally collected, and can be easily and regularly disposed of.

Embodiments of the condensation dryer according to the invention and method will be explained with reference to Figure 1 and Figure 2.

FIG. 1 shows a condensation dryer;

FIG. 2 shows the region in the condensation dryer in which the process air spiral is located.

The condensation dryer 1 according to FIG. 1 has a drying chamber 2, into which the material to be dried, generally linen, is filled. The drying chamber 2 can be driven by a motor, not shown. By means of a first blower 7, the drying chamber 2 is supplied with the process air heated by means of a heater 13 in the direction of the arrow. The air fed to the condensation dryer 1 is conducted in a closed process air circuit 3,4,5. From the drying chamber 2, the moisture-enriched process air flows into the condenser 10, where the moisture is condensed in the condenser 10 as a function of the cooling and collected in a first collecting vessel 11. The process air dried in this way is then passed through the first fan 7 through a heater 13 and heated. Subsequently, the heated process air is fed back into the drying chamber 2, whereby the cycle of the process air is closed. The first receptacle 1 1 is located in the vicinity of the capacitor 10 and thus at a very low-lying and difficult to reach for a non-expert operator place. In order to make the disposal of condensed water possible for such an operator, the water is pumped from the first receptacle 1 1 in a more accessible condensate tank 14; a designated pump is not shown for clarity. The condensate tank 14 can be easily emptied after each use of the condensation dryer 1.

The location of the process air coil 20 is only indicated in the schematic drawing of FIG. At the lower end of the process air coil 20 is a second collecting vessel 12, which is connected via a pipe socket 19 with the overlying first collecting vessel 1 1.

In the condensation dryer 1 of Figure 1, the first fan 7 and the second fan 8, which promotes cooling air for the condenser 10, by a common motor, which is located in a drive unit 6, driven. However, the drive of the two fans 7 and 8 can also be done separately.

The process air circuit 3, 4, 5 need not necessarily be closed; if necessary, it is possible to change between an open and a closed process air circuit 3, 4, 5 by means of a suitable system of flaps or the like. In Figure 1, the process air circuit is closed for the sake of simplified illustration.

The condensation dryer 1 according to FIG. 1 has an open cooling air duct 9, in which a cooling air flow from the cooling air inlet 15 to the cooling air outlet 16 is conveyed. According to the invention, however, a closed cooling air flow circuit is possible, or the condenser 10 and the heater 13 may be components of a heat pump.

FIG. 2 shows the region in the condensation dryer in which the process air coil 20 is located (in section 4 of the process air cycle). The process air entering in the arrow direction in section 4 of the process air cycle is conveyed by means of a first blower 7, 20 with rotor or fan wheel 7 and stator or process air coil 20 into the section 5 of the process air cycle (see arrow direction). In the lower part of the process air coil 20 there is an opening 17, through which water can enter a second collecting vessel 12.

The rotational movement of the fan wheel 7 about the fan axis 18 creates an overpressure on the outer circumference of the fan wheel 7 (indicated by a "+" in Figure 2.) In front of the blower 7, 20, in particular also in the region of the upper first collecting vessel 11, arises 2, since an excess pressure is generated in the region of the second collecting vessel 12 due to the operation of the blower 7, 20, the water dropped there can pass through a pipe connection 19, which extends into both the second collecting vessel 12 as well as into the first collecting vessel 11, due to the pressure difference, are transported into the upper first collecting vessel 11, from where the water can then be conveyed further to the condensate vessel 14, as already explained second collecting vessel 12 and the pipe socket 19 thus form an example of a guide arrangement, with which water from the process air spiral 20 sucked into the first receptacle 1 1 and can be disposed of together with the separated in the condenser 20 from the process air water.

Claims

claims

A condensation dryer (1) having a drying chamber (2) and a process air circuit (3,4,5) for circulating process air through the drying chamber (2), the process air circuit (3, 4, 5) coming from the drying chamber (2) first to a condenser (10) for cooling the process air, separating water from the process air and collecting the water in a first collecting vessel (11), then to a first blower (7, 20) for driving the process air, then to a heater (13 ) to heat the process air and then back to the drying chamber (2), and wherein the first fan (7, 20) comprises a rotor (7) and a process air spiral (20) formed stator (20), characterized in that between the Process air spiral (20) and the first collecting vessel, a guide arrangement (12, 17, 19) is formed, through which water from the fan (7,20) in the first collecting vessel (1 1) is transportable.

2. condensation dryer (1) according to claim 1, wherein the guide arrangement (12,17,19) has an opening (17) in the process air coil (20), via this with the fan (7,20) communicating second collecting vessel (12). , in which water from the process air spiral (20) can drip, and a with the second collecting vessel (12) and the first collecting vessel (1 1) communicating pipe socket (19).

3. condensation dryer (1) according to claim 2, wherein the opening (17) is located at a vertically lowermost point of the process air spiral (20).

4. condensation dryer (1) according to one of the preceding claims, wherein the first fan (7,20) is a centrifugal fan (7,20).

5. condensation dryer (1) according to one of the preceding claims, wherein the first collecting vessel (1 1) communicates with a lying above this condensate tank (14) for collecting the water.

6. Condenser dryer (1) according to one of the preceding claims, which has an open or closed cooling air duct (9) through which the condenser (10) by means of a second blower (8) cooling air from an environment of the condensation dryer (1) fed and after the Cooling of the process air from the condensation dryer (1) can be led out.

7. A method for drying laundry in a condensation dryer (1) Condensation dryer (1) with a drying chamber (2) and a process air circuit (3,4,5) for circulating process air through the drying chamber (2), wherein the process air circuit (3, 4,5) from the drying chamber (2) first to a condenser (10) for cooling the process air, separating water from the process air and collecting the water in a first collecting vessel (11), then to a first blower (7,20) for driving the process air, then to a heater (13) for heating the process air and then back to the drying chamber (2), and wherein the first fan (7, 20) comprises a rotor (7) and a stator formed as a process air spiral (20) (20), characterized in that water which collects in the process air spiral (20) by means of a between the process air coil (20) and the first collecting vessel formed guide arrangement (12, 17,19) by means of a between the capacitor (20) and the fan (7,20) adjusting pressure difference in the first collecting vessel (1 1) is transported.

8. The method according to claim 7, wherein in the first collecting vessel (1 1) collected water is pumped into a condensate tank (14).