EP1788248B1 - Peristaltic pump - Google Patents

Abstract

The pump has a pump body (1) and a receiving part (1a) for the hose (2) in a recess (3). A wheel (5) with rams (6) is based on a non-round rotor (8), which presses the rams against the hose and withdraws them from it in succession.

Description

Peristaltic pumps are e.g. used in dialysis for blood transport. Usual are roller pumps, in which a rotating roller carrier is provided, wherein the rollers gradually compress a piece of the tube over its length, thus conveying the liquid forward. By rolling the rollers on the hose creates friction (rolling resistance) and wear. The speed can therefore be relatively low.

By the German Offenlegungsschrift DE 1911874 A1 a peristaltic pump is known in which the hose is pressed by the side of a pivotable, successively operated pressure fingers against a support surface for the hose. For this purpose, a rotating eccentric is provided, which acts on the other side of the pressure fingers. The peristaltic pump consists of many parts, has a large volume and is prone to failure and expensive.

This also applies to the peristaltic pump according to the German Offenlegungsschrift DE 2152352 A1 in which the tube rests against a cylindrical inner surface and is progressively compressed by a circumferential eccentric body, wherein between the hose and the eccentric body in a ring radially movably guided pressure body are arranged.

Out FR 1 430 288 is a hose pump with a receiving part for a flexible hose in a recess and a ring with a plurality of radially extending punches which are pressed with their outer ends against the tube lying in the recess known. Furthermore, acts on the inner end of the punch, a motor-driven, non-circular rotor such that the punch pressed during the rotation of the rotor progressively against the hose and then moved back in the opposite direction to release the hose one after the other. In addition, the stamps are wrapped at their outer ends by an elastic band, which presses the punch with their inner ends against the rotor. The stamps are in holes a ring guided longitudinally displaceable. The peristaltic pump is made up of relatively many individual parts consuming.

The invention has for its object to build a peristaltic pump of a few items and to prevent the rolling resistance, so that higher speeds are possible and the wear of the hose is low.

• Fig. 1 eine Ansicht einer Schlauchpumpe nach der Erfindung mit geöffnetem Deckel,
• Fig. 2 einen Schnitt nach der Linie II-II in Fig. 1,
• Fig. 3 und 4 Varianten der Schlauchlagerung bei der Schlauchpumpe gemäß den Fig. 1 und 2,
• Fig. 5 eine Variante der Schlauchpumpe gemäß den Fig. 1 und 2 für zwei Schläuche und
• Fig. 6 eine Variante des inneren Teils der Schlauchpumpe gem. den Fig. 1 und 2, bei der gleitende Reibung vermieden ist.

The invention is explained below with reference to the drawing. Show it:

• Fig. 1 a view of a hose pump according to the invention with the lid open,
• Fig. 2 a section along the line II-II in Fig. 1 .
• 3 and 4 Variants of the hose storage in the hose pump according to the Fig. 1 and 2 .
• Fig. 5 a variant of the peristaltic pump according to the Fig. 1 and 2 for two tubes and
• Fig. 6 a variant of the inner part of the hose pump acc. the Fig. 1 and 2 in which sliding friction is avoided.

In the Fig. 1 and 2 is a pump body with 1 and 1a a receiving part, for. B. plastic, designated for a hose 2. The hose 2 is made of flexible material and is located in a recess 3, which results from pump body 1 and receiving part 1a. The recess 3 is formed by a plastic cover 4, which in Fig. 1 is omitted, closed.

In the recess 3, a wheel 5 is arranged with a plurality of approximately radially located punches 6, which are interconnected by resilient webs 7. The stamp 6 are with their outer ends by a non-circular, z. B. elliptical rotor 8 progressively pressed against the tube 2 and lie with their inner ends on the rotor 8 at. During the rotation of the rotor 8, z. B. in the direction of arrow 9, the tube 2 is compressed by the plunger 6 progressively peristaltic and the punch 6 are then moved back to release the tube 2 in succession. This will be liquid from the entrance 10 to the exit 11. An electric motor 12 drives the rotor 8.

In the Fig. 3 is a variant in the area III of Fig. 2 shown. In this case, a yielding material 14 is applied to the punches 6 opposite the tube bed 13 of the recess 3, which prevents excessive squeezing of the tube 2. Alternatively, the punch 6 may be formed resiliently in its longitudinal direction.

Between this material 14 and the hose 2 is gem. Fig. 4 a U-shaped receiving part 15 in which the tube 2 is located between serving as stops 16 sides, which rests on the elastic material 14 and is movable in the direction of the tube bed 13 of the recess 3. As a result, the pressing path of the hose 2 is limited. The latter is not completely compressed and thus z. B. lowered the hemolysis rate of blood pumps.

The Fig. 5 shows that the hose 2 between the wheel 5 (punch 6) and the hose bed 13 can be biased so that the flexing is reduced. In the recess 3, a further, unbiased hose 2a is arranged. The hose pump can therefore work simultaneously with several hoses.

In the variant according to Fig. 6 is located at the inner ends of the punch 6, a flexible ring 17 and between this ring 17 and the rotor 8 are rolling elements 18, which are guided by a flexible cage 19. Sliding friction between the punches 6 and the rotor 8 is thereby prevented.

1. 1. Keine Rollreibung am Schlauch 2, 2a (kein Darüberrollen über den Schlauch 2, 2a). Hohe Drehzahlen sind möglich, daher ist kein vollständiges Zusammendrücken des Schlauches 2, 2a erforderlich; der Schlauchpressweg kann begrenzt werden.
2. 2. Schlauch 2, 2a kann über seine Presslänge vorgespannt werden, daher sind geringe Schlauchpresswege erforderlich, d. h. es sind große Schlauchdurchmesser bei geringen Presswegen möglich.
3. 3. Die Stempel 6 sind durch die Stege 7 miteinander zu einem Rad 5 verbunden, daher müssen die Stempel 6 nicht durch den Schlauch 2, 2a zurückgedrückt werden oder bei weichen Schläuchen durch Federn. Die Rückstellung der Stempel 6 erfolgt durch die Form und Bewegung des Rotors 8.

The main advantages of the hose pump described are:

1. 1. No rolling friction on the hose 2, 2a (no rolling over the hose 2, 2a). High speeds are possible, so no complete compression of the tube 2, 2a is required; The hose pressing path can be limited.
2. 2. Hose 2, 2 a can be biased over its press length, therefore, low Schlauchpresswege are required, ie, it is possible large hose diameter at low pressure paths.
3. 3. The punch 6 are connected by the webs 7 together to form a wheel 5, therefore, the punch 6 must not be pushed back through the tube 2, 2 a or soft tubes by springs. The provision of the punch 6 is effected by the shape and movement of the rotor eighth

LIST OF REFERENCE NUMBERS

1

pump body

1a

receiving part

2,2a

tube

3

recess

4

cover

5

wheel

6

stamp

7

Stege

8th

rotor

9

arrow

10

entrance

11

output

12

electric motor

13

tube bed

14

elastic material

15

receiving part

16

attacks

17

ring

18

rolling elements

19

Cage

Claims (7)

1. Peristaltic hose pump with a housing (1a) for a flexible hose (2, 2a) in a recess (3) and a wheel (5) with several approximately radially arranged stamps (6) whose outer ends can be pressed against the hose (2, 2a) which is lying in the recess (3); the stamps (6) being interconnected by elastic bars (7) to form one single part made out of plastic; wherein a motor-driven non-circular rotor (8) acts upon the inner ends of the stamps in such a manner that when the rotor (8) rotates, the stamps (6) are pressed successively against the hose (2, 2a) and are moved back one after the other in the opposite direction to release the hose (2, 2a).
2. A hose pump in accordance with claim 1, characterized in that the rotor (8) has an elliptical cross-section.
3. A hose-pump in accordance with at least one of the preceding claims, characterized in that the hose bed (13) of the recess (3) opposite the stamps (6) is covered with an elastic material (14).
4. A hose-pump in accordance with at least one of the preceding claims, characterized in that the stamps (6) are resilient in the longitudinal direction.
5. A hose-pump in accordance with at least one of the preceding claims, characterized in that stops (16) for the stamps (6) are provided inside the recess (3) which enclose the hose (2, 2a) from the sides.
6. A hose-pump in accordance with claim 5, characterized in that the stops (16) for the sides of a u-shaped bearing (15) for the hose (2, 2a) and that this bearing (15) rests upon the elastic material (14).
7. A hose-pump in accordance with at least one of the preceding claims, characterized in that a the inner ends of the stamps (6) surround a flexible ring (17) and that there are rolling-elements (18) between this ring (17) and the rotor (8) which are guided by a flexible cage (19).

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