DE2842737A1 - High pressure liq. pump - has flexible hose with one end fixed and other moved by reciprocating plunger to vary curvature of hose - Google Patents

Abstract

A flexible semicircular hose (2) is held at one end in a block. This contains a non return inlet valve (4) into the hose. The other end of the hose is held in a reciprocating plunger (8). This has a non-return discharge valve (10) into a discharge connection (11). The plunger is depressed against a spring by a cam or eccentric (9) on a camshaft. The movement of the plunger bends the flexible hose and thus alters its cross section and therefore volume. This gives a pumping action on the fluid in it. The stroke can be adjusted by a linkage (17, 15) which alters the rest position of the plunger.

Description

Tube pump for conveying liquids

The invention extends to a tube pump for conveying Liquids in small quantities at high pressure.

Such pumps are known as piston pumps. I) these have, however the disadvantage that the piston and cylinder are relatively due to precise manufacturing are expensive and that an exchange of these parts or the required seals, which have become unusable due to abrasive wear cannot be avoided.

The object of the invention is to provide a liquid pump for small delivery rates to create at high pressure that is simple and cheap to manufacture and operate is.

This object is achieved in that a tube consists of a resilient elastic material is firmly clamped at one end in a support body and t its other end with an oscillating pump drive, especially one Eccentric drive is engaged.

By bending and stretching the unilaterally clamped federud elastic The tube around the neutral fiber (center of gravity line) are alternately in the of this removed and the outer fibers of the pipe lying in the bending direction tensile and compressive stresses caused, walche the cross-sectional area of the pipe and thus the volume of the same change in the same rhythm from a maximum to a minimum.

According to a further feature of the invention, the pipe can be cross-sectioned be designed essentially square and there can be two opposite Side surfaces are concave. Furthermore, the oscillation amplitude of the Eccentric be directed parallel to the concave side surfaces.

As a result, the side faces at e new. \ Outward bulging is prevented, rather these are forced inward to bulge against each other, resulting in a substantial cross-sectional constriction of such Rohres leads. The high, this cross-sectional constriction when the pipe is bent Inevitably causing tensile and compressive stresses therefore displaced one Liquid located in the tube, possibly at high pressure.

In addition, either of the other two can be essentially planar Side surfaces of the tube several, transverse to the longitudinal axis and in the area of curvature of the Have horizontal beads.

This has the advantage that the bending of the pipe creates compressive stresses This side surface can be better pressed in, which reduces the deflection of the pipe and a reduction in the pipe volume is favored.

Furthermore, the tube can be substantially dumbbell-shaped in cross-section be designed and it can depending on the two parallel, opposite surfaces a leaf spring can be arranged. This design enables liquid to be conveyed under particularly high pressure.

Furthermore, a pump valve can be installed in the 7u and drainage pipes. Check valve or the like. be provided. This will result in a volume expansion sucked in liquid in the year and a part in the subsequent volume reduction the sucked-in liquid is displaced through the drain.

Finally, the tube can be made up of one or more helical shapes curved turns exist.

As a result, the delivery rate of the tube pump can be designed to be increased accordingly will.

Based on an embodiment shown in the drawing the invention will be explained in more detail. They show: FIG. 1 a view of a tube pump, FIG. 2 shows a pipe pump according to FIG. 1 with an inlet and outlet on one side, FIG. 3 shows a cross section through the pipe of a pipe pump and FIG. 4 shows a cross section through the pipe of a Tube pump in a particularly useful design.

The tube pump shown schematically in FIGS. 1 and 2 consists from a support body 1, in which a tube 2 made of a resiliently elastic material firmly clamped isL, the tube 2 can be straight, arcuate, in the form of a helical spring or be designed differently.

With a straight flow of the pumped liquid (Fig. 1) is in Support body 1 provided a liquid flow @ with a check valve 4, which is in communication with the hollow pipe cross-section C via a channel 5. The free Pipe end 7 is provided with a pump drive tappet 8, which is connected to a pump drive, Eccentric or the like. 9 iu is engaged and the pipe end 7 in oscillating motion offset. In the pump drive tappet 8 there is another check valve 10 for the Liquid outflow 11 is arranged.

If the pipe 2 is curved more by the pump assembly 9, it is through the resultant change in cross-section of the pipe fluid v @@ pushes during an expansion of the pipe volume due to the spring-back when the pump drive is reversed occurs, so that liquid is replenished via the non-return valve 4.

With the support body 1, a bracket 12 is connected, which has a bearing pin 13 carries. A double-armed lever 14 is pivotably mounted on the bearing pin 13. One lever arm 15 engages in the pump drive tappet 8, while the other Lever arm 16 can be moved via a connecting rod 17 such that the Pump drive tappet 8 more or less lifts off from eccentric 9. This is the Oscillating movement of the pipe and thus the delivery rate can be regulated.

In Fig. 2 are the inflow and outflow of the liquid and the two Backflow valves 4, 10 are arranged in the support body 1. The free end of the pipe 7 carries a cup-shaped pump drive plunger 18, which is driven by a pump drive 19 is set in oscillating motion. By one provided inside the tube 2 Hose channel 20, the displaced liquid is conducted to check valve 10 and can flow off via the liquid drain 11.

In Fig. 3 is a tube 2 with a substantially quadrangular Cross section 21 of a tube pump shown, with two opposite side surfaces 22 and 23 are concave, while the other two side surfaces 24 and 25 have flat contours, iinen also provided in the side surface 25 beads 26 which extend essentially transversely to the longitudinal axis of the tube 2. the Concave-shaped side surfaces 22 and 23 force with increasing pipe curvature during the oscillating movement an increasing displacement of the liquid due to the fact that sic When bending, the concave side surfaces curve inwards and the clear cross-section narrow, while the beads 26 also the bend of the tube 2 be.-favorable.

That in the lig. 4 Mohr 2 shown in cross section is dumbbell-shaped educated. When bending in direction A, in particular, the free passage will be 27 strongly reduce, so that with such a tube pump a considerable flow rate can be achieved. To increase the delivery pressure, on the outside of the Tube 2 two leaf springs 28, 29 are arranged, which loosely and on the one hand are firmly anchored in the support body 1, on the other hand in the pump tappet 8 and in the same Rhythm can be moved with the tube 2.

The tube 2 can also be bent in the shape of a helical spring to form several turns if the tube pump is to be designed for a larger flow rate.

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Claims (7)

Claims tube pump for pumping liquids in small Quantities at high I) jerks, which means that there is a pipe (2) made of a resilient elastic material with an end in a support body (1) is firmly clamped and at its other end (7) with an oscillating pump drive, in particular an eccentric drive (9) is in engagement. 2. Pipe pump according to claim 1, d a d u r c h g e -k e n n z e i c Not that the tube (2) has an expensive cut (21) and is essentially rectangular in shape is and that two opposite side surfaces (22, 23) are concave. Pipe pump according to claims 1 and 2, d u r c h g e n n z e i c h n e t that the oscillation amplitude of the eccentric drive (@) is parallel to the konl aven side surfaces (22, 23) is directed. 4. Tube pump nncli claims 1 to 3, d a d u r c h g e k e n n z e i c h n e t @ that one of the two is different, essentially flat side surfaces (24, 25) of the tube (2) mehreme, transversely to the longitudinal axis and in the area of curvature of the Has tube (2) lying beads (26). 5. Pipe pump according to claim 1, d a d u r c h g e -k c n n z e i e h n e t @ that the tube (2) is essentially skin-shaped in cross section is and that on the two parallel, opposite surfaces each have a leaf spring (28, 29) is arranged. (. Pipe pump according to claims 1 to 5, d u r c h g e k e n n z e i c h n e t that in the inflow and outflow (3, 11) of the pipe (2) each have a pump valve, Check valve or the like. (4, 10) is provided. 7. Pipe pump according to one or more of claims 1 to 6 du r c h g e k k n n z e i c h n e t that the tube (2) consists of one or more helical springs curved turns.