WO2013041092A2

WO2013041092A2 - Peristaltic pump

Info

Publication number: WO2013041092A2
Application number: PCT/DE2012/100294
Authority: WO
Inventors: Gunter Krauss
Original assignee: Gunter Krauss
Priority date: 2011-09-21
Filing date: 2012-09-21
Publication date: 2013-03-28
Also published as: DE112012003935A5; WO2013041092A3; DE202012103619U1; DE102012108900A1

Abstract

The invention relates to a peristaltic pump comprising at least one tube and one or more occluding means for continually occluding the tube in the direction of travel of a fluid. A contact surface of the tube rests on a casing, and the contact surface of the tube in the casing and/or the occluding means has/have occluding elements in the direction of the tube, said occluding elements being designed in the form of elevations, and/or the tube is multilayered at least in the occluded region and/or consists of multiple individual tubes that are inserted into each other.

Description

peristaltic pump

The invention relates to a peristaltic pump, in particular in the radial design.

A peristaltic pump, also referred to as a peristaltic pump or peristaltic pump, is a positive-displacement pump in which the medium to be delivered is forced through it by external mechanical deformation of a hose. In this case, the hose is supported in each case on the outside of the housing of the pump head and is clamped from the inside by rollers or sliding shoes, which rotate on a rotor (radial active system). In the case of the linear actuation system, the clamping elements are moved via a camshaft. In any design, the movement causes the Abklemmstelle moves along the tube, thereby driving the fluid. The generation of the intake vacuum is in standard hose pumps by the elasticity of

Tubing produced.

A distinction is made between devices with a maximum working pressure of approx. 2 bar and 16 bar. Up to 2 bar are mainly so-called dry runners, where there is no lubricant in the pump head. Up to 16 bar, the pump head is filled with a lubricant, which also fulfills a cooling function at the same time.

The disadvantage of peristaltic pumps is their relatively short hose life due to heavy walking, the danger of hose damage if the pump and the pump medium are not adapted correctly (chemical resistance and solid load), whereby the pumping capacity and pressure are reduced with increasing hose wear.

Therefore, high demands are placed on the pump hose in terms of Walkability, elasticity, abrasion resistance and dimensional stability. The delivery volume depends on the cross-sectional dimensions of the pump hose and its resilience. Usually pump hoses for peristaltic pumps made of highly elastic material, eg. As silicone, manufactured with high dimensional accuracy and have a round cross-section. To withstand the required pressures, the

Pump hoses have a relatively high wall thickness, whereby the required forces are relatively high, with which the hose must be compressed.

Furthermore, it is difficult to really clamp the hose completely tight.

Therefore, hoses with special cross-sectional geometries have been developed.

For example, a pump hose for a peristaltic pump is known from the document DE 39 09 657 A1, which in the undeformed state of two arcuate There are sections that merge along crease lines so that it has the cross-sectional shape of a convex lens. At the junctions of the arcuate sections follow outwardly facing webs. When the hose is compressed, only moderate bruising occurs at the connection points and the webs are intended to prevent over-squeezing.

From the document DE 101 31 563 A1 a hose pump and a

Hose member known, wherein the hose member has a hose which is preformed into a shape which is adapted to the inner peripheral surface of the pump housing. The tube has a substantially lenticular cross-section and is made of a synthetic resin molding material with high chemical resistance,

For example, polypropylene, polyethylene or fluorocarbon resin, which, however, has a low flexibility and elasticity. A hose for peristaltic pumps made of rubber or rubber-like plastics, which in an arcuate shape of a rotating pressing member, in particular in the form of a pressure roller on a support track is compressible, in such a way that arise on both sides of the hose at this kinking, is also from DE 295 01 633 U1 known. In this solution, the hose body at least over most of its kink area (compared to the other cross-sectional areas) on a lower hardness.

The aforementioned solutions are expensive to produce and thus costly.

It is also known from DE 10 2006 016 806 A1 discloses a displacement machine, in which a reliable and leak-free sealing takes place in that a common wall portion of the variable-volume working chambers is profiled on the working chamber inside pages. For this purpose, a kind of sawtooth profile is provided, wherein the teeth preferably extend transversely to the direction of movement of the moving element and are spaced apart in the direction of movement. Two themselves

opposite wall sections are on their inside with a

Profiling provided. The formation of this sawtooth profile towards the

Working chamber is very expensive and hoses not feasible.

Further pumps of the prior art can be found in the publications DE 10 2005 052 623 B4, DE 3431 189 A1, DE 10 2009 059 721 A1 and CH 266467. The object of the invention is to develop a peristaltic pump, in particular in a radial design, which has a simple and inexpensive structural design and works with high efficiency and environmentally friendly. This object is solved by the features of the first claim.

Advantageous embodiments emerge from the subclaims.

The hose pump has at least one hose and one or more

Clamping means for progressively disconnecting the hose, wherein under a progressive Abklemmbewegung the fluid is transported in the hose.

According to the invention arranged in the housing bearing surface of the hose and / or the clamping means in the direction of the hose clamping members which are formed in the form of elevations and by which a reliable and complete or almost complete clamping of the hose is guaranteed. The Abklemmelemente are preferably arranged at a small distance from each other and may be formed, for example in the manner of a toothing, which is transverse to

Transport direction extends.

Additionally or alternatively, the tube is formed in multiple layers at least in the area that is clamped and / or consists of several nesting individual hoses, on the one hand to ensure the required flexibility and on the other hand, the required abrasion resistance and compressive strength.

In the case of a layered construction, the tube has at least one inner layer made of an elastic material which springs back outside the clamping point to its outer diameter and at least one outer layer consisting of a textile, flexible, abrasion-resistant and pressure-resistant material and a high bursting pressure withstand.

Alternatively, the hose may be made of e.g. be composed of two individual tubes, wherein an inner first single tube made of an elastic material which springs back outside the Abklemmstelle / n to its outer diameter. This is inserted into an outer second single tube made of a textile, flexible material.

Silicone is preferably used as elastic hose material. The outer second single tube is preferably a pressure hose made of a flexible synthetic fiber fabric, which withstands a high bursting pressure. For this purpose, a fire hose or a section of a fire hose has proved particularly advantageous since the fire hose can be loaded up to a pressure of 50 bar. Alternatively, other thin-walled flexible pressure hoses can be used as an outer tube.

Preferably, two to four spaced apart clamping means for

Clamping of the hose is provided, which on the rotor, which is rotatably mounted on a rotating shaft, in the form of rotatable rollers or

Sliding shoes or sliding elements are formed. Both on the rollers and on the shoes / sliding elements Abklemmelemente can be formed.

The hose is supported on the outside of a housing on a contact surface and inside the Abklemmmittel (sliding elements, shoes, rollers) with the

Drive shaft rotatably mounted.

The tube is preferably received in a circular segment-like bend in the housing or alternatively clamped linearly to the housing by means of rotatingly mounted rollers. If a pressure valve is arranged at the outlet of the peristaltic pump, it works as a compressor.

According to the invention, the peristaltic pump has at least one longitudinally or curvedly extending pressure chamber and one or more clamping means for advancing local clamping of the pressure chamber along the pressure chamber. Of the

Pressure chamber can be formed, for example, in a progressively partially clamped hose or a progressively partially abklemmbaren hose-like element.

Alternatively, the pressure space between a housing with a recess and one or more arranged in the recess sealed to this

Be formed elements, wherein by the / the clamping means / the elements in the recess, the cross section of the pressure chamber progressively partially clamping, can be pressed.

The hose is supported on the outside of a housing on a contact surface and inside the Abklemmmittel are rotatably connected to the shaft and the shaft rotatably mounted in the housing. As a flow medium, a liquid or gaseous fluid can be used, for example as a gaseous fluid air or as a liquid fluid water. However, other liquid or gaseous media can be transported with the pump according to the invention.

The pump is inexpensive to manufacture, works very energy efficient, is very smooth and can be used in conjunction with an output-side valve for the first time as a compressor.

The invention will be explained in more detail with reference to embodiments and accompanying drawings. Show it:

FIG. 1 shows the basic structure of a peristaltic pump,

FIG. 2 peristaltic pump with outlet-side pressure valve,

Figure 3 is a schematic diagram of a linearly extending pressure chamber in one

tubular element,

FIG. 4 shows a cross-section of an embodiment, similar to FIG. 3, at the top with a roller not shown, at the bottom with the pressure chamber clamping roller,

5 shows a pressure chamber between a housing with a recess and one or more in the recess arranged sealed to this U-shaped elements in cross section,

6 shows a cross section of a variant in which the pressure chamber is formed between two intermeshing U-profiles, above with not shown roller, below with clamped pressure chamber, Figure 7 shows a cross section of a variant in which a circumferentially closed cushion between two profiles is arranged through a whale

be moved against each other, wherein the pressure chamber located in the cushion is disconnected continuously.

According to Figure 1, the hose pump 1, a housing 2, in which a hose 3 is inserted here bent by 180 ° and rests with its outer region on a correspondingly curved contact surface (trundle bed) 2.1 of the housing 2. Inside the case 2 is mounted by means of a drive shaft 4, a rotor 5 and driven here in a clockwise direction. The rotor 5 has two clamping means 6 rotatably mounted thereon, which are designed in the form of rotatable rollers and compress the tube 3. To ensure that the tube 3 is completely or almost completely disconnected, the housing 2 adjoins the contact surface 2.1 or formed in this first Abklemmelemente in the form of first elevations 7.1 in the direction of the tube 3, which at close intervals to each other are arranged. The first elevations may be formed, for example, by a toothed belt (not shown), which rests against the contact surface 2.1 and whose toothing points in the direction of the hose 3.

The clamping means 6 are provided at its periphery with Abklemmelementen in the form of second elevations 7.1, which are formed in the manner of a toothing. Between the tube 3 and the first and / or second elevations 7.1, 7.2 can additionally foil are arranged (not shown), which protects the tube 3 from heavy abrasion. The tube 3 here consists of two individual tubes in the form of a first inner single tube 3.1 made of silicone and an outer second

Single hose 3.2 in the form of a fire hose or a section of a fire hose.

For required hose dimensions, which are not available as a fire hose, or as an alternative to fire hose other external hoses can be used, which are flexible and fold flat when missing pressure (such as the fire hose) and withstand high bursting pressure. The fact that the silicone hose is supported on the fire hose (or another similar outer hose), the silicone hose can be provided with a smaller wall thickness, through which it is easier to press. Normally, the thinner wall thickness would not withstand high pressures, but the support on the fire hose makes it easy to use thin silicone tubing.

Of course, other single or multi-layer hoses can be used, which are flexible (preferably highly flexible), withstand high pressures and are suitable for the corresponding temperature range.

The tube 3 is supplied in the direction of arrow conveying medium M, when the rotor 5 is rotated by the drive shaft 4 in rotation. Increases 7.1, 7.2 ensure this a reliable disconnection of the tube 3. In one revolution of the rotor 5, the tube 3 is offset by the two at an angle of 180 ° to each other

Clamping means 6 a total of four times progressively compressed. Figure 2 shows a variant of a peristaltic pump 1, in which only on the contact surface 2.1 of the housing 2 elevations 7.1 are provided and on the drive shaft 4, a rotor 5 is arranged with rounded in the direction of the hose Abklemmelementen 6. The medium is air and at the outlet of the tube 3, a pressure valve 9 is arranged, through which the air is compressed, whereby the peristaltic pump operates as a compressor.

The hose 3 is also in this variant of two individual tubes in the form of a first inner single tube 3.1 made of silicone and an outer second single tube 3.2 in the form of a fire hose or a section of a fire hose.

FIG. 3 shows a linearly extending peristaltic pump in which a hose 3 is clamped in a progressive linear movement by two rotating clamping means 6 in the form of rollers against a housing 2 or an abutment surface.

According to FIG. 4, the hose-like element 3b can, for example, rest against a housing 2 or a contact surface and can be folded bellows-shaped in cross-section or be collapsible. The illustration in Figure 4 above shows the variant in which the pressure chamber D is open and the representation below the variant in which the pressure chamber D is closed / clamped. The roller 6 moves to this, as shown in Fig. 3, along the pressure chamber D and pushes or folds the hose-like element together. Due to the pressure acting in pressure chamber D, the tubular element 3b then moves apart again. The tubular element has two opposite parallel sides, one of which rests against the housing and the roller acts on the other. The other two sides are each designed kinked in the direction of the pressure chamber, so that they buckle to each other when the element 3b is compressed by the roller 6.

In particular, the side against which the roller rests can consist of a wear-resistant and abrasion-resistant material. It may be made entirely of steel or spring steel, carbon, aramid or plastic on the side on which the clamping means 6 acts. It is also possible, the side on which the Abklemmmittel 6 acts and to manufacture the voltage applied to the housing 2 side of these materials and the intermediate fold-like region of another material in the manner of a membrane to produce, so that this easily can be squeezed when disconnecting.

Another variant is shown in Figure 5 in cross section. It is in one

Recess of a housing 2 at least one in the direction of the bottom of the recess by means of at least one clamping means 6 (roller) can be pressed displaceable element 3c, which is sealed to the housing. The pressure space D is thus formed between the recess and the element 3c. This is formed in the manner of a U-profile, whose mutually parallel legs are guided in the housing 2 and wherein between the legs of the roller dips.

According to FIG. 6, two U-profiles 3c and 3c 'run into one another, their mutually parallel legs pointing in the direction of the roller 6 and the roller 6 immersed therebetween. Between the two U-profiles 3c, 3c ', the pressure space D is formed according to the upper illustration. The outer profile 3c is supported on the housing 2 with its side connecting the parallel legs. As the roller is moved toward the housing and progressing axially, it pushes the inner profile 3c 'toward the profile adjacent the housing 2, thereby partially and axially clamping the pressure space D as shown in the lower illustration in FIG. With a suitable choice of material should be ensured that outside the roller / n of the mutually parallel sides of the profiles again to form the

Move pressure chamber away from each other.

In the illustration in FIG. 7, as in FIG. 6, a U-profile is attached to the housing 2 and its mutually parallel legs point away from the housing 6. Between the mutually parallel sides of a cushion 8 is arranged with a rectangular profile here in the direction of the housing 2 slidably. Between the pad 8 and the U-profile 3 c, the pressure chamber D is formed. By means of the roller 6, the pad 8 is pushed into the profile and thereby the pressure chamber D partially and axially progressively clamped. This can, as shown by a wide U-profile 3c 'take place, which surrounds the pad 8 and on which the roller acts. The U-profile 3c 'has two mutually parallel legs, which point in the direction of the housing 2 and are guided on the legs of the U-profile 3c outside. Also in the variants gem. FIGS. 3 to 7 may additionally be provided with elevations (preferably on the housing, which ensure reliable disconnection.

Of course, the profiles in Figure 6 and the profiles and the pad 8 are sealed in Figure 7 to the pressure chamber D accordingly.

With the hose pump according to the invention, the energy input can be significantly reduced. The system has an extremely simple and very cost-effective design.

REFERENCE CHARACTERS

peristaltic pump

casing

.1 contact surface

tube

.1 first hose

.2 second hose

a hose-like element

b hose-like element

c U-profile

drive shaft

5 rotor

6 Clamping means

7 increase

7.1 first increase

7.2 second increase

8 pillows

9 pressure valve

D pressure chamber

M fluid

Claims

claims

Hose pump with at least one hose (3) and one or more clamping means (6) for progressing in the conveying direction of a fluid disconnecting the hose (3), wherein the hose (3) on a housing (2) on a contact surface (2.1) is supported, characterized,

- That in the housing (2) arranged contact surface (2.1) of the hose (3) and / or the clamping means (6) in the direction of the hose (3) Abklemmelemente (6), which are in the form of elevations (7)

and or

- That the hose (3) is formed at least in the area to be clamped, multi-layered and / or consists of several nestable individual hoses.

Hose pump according to claims 1, characterized in that the

Abklemmelemente (6) are arranged at a small distance from each other.

Peristaltic pump according to claim 1 or 2, with which a fluid is transported, wherein the peristaltic pump (1)

Having at least one longitudinally or curved extending pressure chamber (D) and one or more clamping means (6) along the pressure chamber progressing clamping of the pressure chamber (D).

Hose pump according to one of claims 1 to 3, characterized in that the Abklemmelemente (6) are formed in the manner of a toothing.

Peristaltic pump according to one of claims 1 to 4, characterized in that the hose (3) has at least one inner layer of an elastic material which springs back outside the Abklemmstelle / n to an outer diameter and that the hose (3) at least one outer layer a flexible and pressure-resistant textile material.

Peristaltic pump according to claim 5, characterized in that the hose (3) has an inner first single hose (3.1) made of an elastic material which springs back outside the Abklemmstelle / n to an outer diameter and that the hose is an outer second single hose (3.2) of a textile, flexible material and that the first and the second tube are inserted into one another.

Hose pump according to claim 6, characterized in that the outer second single hose (3.2) is a pressure hose made of a synthetic fiber fabric.

Hose pump according to claim 6 or 7, characterized in that the outer second single hose (3.2) is a fire hose or a portion of a fire hose.

Hose pump according to one of claims 1 to 8, characterized in that at the output of a pressure valve (9) is arranged and this operates as a compressor. 10. peristaltic pump according to one of claims 1 to 9, characterized in that the pressure chamber (D) in a progressively disconnectable hose (3a) or a progressively disconnectable hose-like element (3b) is formed.

1 hose pump according to one of claims 1 to 10, characterized in that the pressure chamber (D) between a housing (2) having a recess and one or more arranged in the recess sealed to this

Is formed and that by the / the clamping means (6) / the elements in the recess, the cross section of the pressure chamber (D) progressively clamping, be pressed or that the pressure chamber (D) is formed between each other displaceably arranged profiles through a roller partially movable towards each other are such that the pressure chamber (D) is partially axially progressively clamped.

12. peristaltic pump according to one of claims 1 to 1 1, that the / the clamping means (6) rotatably received at a curved extending pressure chamber (D) on a shaft (4).

13. Peristaltic pump according to one of claims 1 to 12, characterized in that the clamping means (6) are designed in the form of rotating rollers, rollers or sliding shoes.