PERISTALTIC PUMP WITH OSCILLATING DRIVE AND DIVERTER FITTING

Abstract

A peristaltic pump with an oscillating drive 14 and a diverter valve 5, having a cylindrical pump housing 2 and the ports 4 and 12 are arranged in a end wall. The ports 4 and 12 are alternately used as outlet and inlet, controlled by the diverter valve 5 and in dependence on the pivot direction of the pump head 7. The roller or the sliding shoe 8 constantly flattens the pump hose and in this way, forms an annular space that is distinguished into a suction and compression chamber. Due to the constant contact of the roller or the sliding shoe 8, a sudden space enlargement is prevented according to the invention.

Claims

1. A peristaltic pump with comprising: a cylindrical pump housing centered on an axis, having an inner surface, and formed with angularly spaced intake and output ports; a hose lying against the inner surface and having ends connected to or extending through the ports; a pump head pivotal in the housing and provided with a head that flattens the hose; an oscillating drive that can displace the pump head along a circular arc alternately back and forth as far as the ports while the roller or the sliding shoe of the pump head constantly flattens the pump hose during output and intake and does not disengage from the hose; and diverter valve means connecting the ports alternately as inlet and outlet synchronously with oscillation of the pump head.

2. The peristaltic pump according to claim 1, wherein the diverter valve is controlled by the position of the pump head.

3. The peristaltic pump according to claim 2, further comprising: a respective position detector at each angular end position of the head for controlling the diverter valve and a change in the direction of pivot of the the pump head.

4. The peristaltic pump according to claim 1, wherein the diverter valve is electrically, hydraulically or mechanically driven.

5. The peristaltic pump according to claim 1, wherein the diverter valve is mounted on the cylindrical pump housing or on an external container outside of the pump housing.

6. The peristaltic pump according to claim 1, wherein the diverter valve has a connection piece connectable with a flexible output hose and coupled to one of the ports in the two end positions of the diverter valve that can pivot between them.

7. The peristaltic pump according to claim 1, further comprising: at least one shape-stable internal ball or external rollers is in or on the outside of the pump hose next to the hose is flattened by the head.

8. The peristaltic pump according to claim 1, wherein the pump housing is mounted beneath a material holder forming an end wall of the housing.

9. The peristaltic pump according to claim 1, wherein the pump housing can pivot about an axis perpendicular to the axis of rotation of the pump head and has bolts opposite each other on the pivot axis and projecting out from the housing that is mounted via the bolts.

10. The peristaltic pump according to claim 1, wherein the oscillating drive is a hydraulic motor.

11-13. (canceled)

13. The peristaltic pump according to claim 1, wherein the hose has a bearing surface that is turned toward and engageable with the roller and that lined with a rubber or polyurethane layer to increase the life of the hose.

14. The peristaltic pump according to claim 1, wherein the pump hose extends along a circular arc centered on the axis in the pump housing and does not disengage from the pump housing ends of the hose being connected to respective pipe pieces bent at 90 degrees and passing through a housing wall and forming the ports.

15. The peristaltic pump according to claim 1, wherein a torque greater than 10,000 Newton-meters can be generated with the drive motor of the pump head.

16. The peristaltic pump according to claim 1, wherein the pump hose has a rated width larger than 50 mm.

17. The peristaltic pump according to claim 1, wherein the pump hose has a wall thickness greater than 20 mm and has at least 4 fabric inlays.

18. The peristaltic pump according to claim 1, wherein the drive motor drives the pump head through a planetary gearing.

19. The peristaltic pump according to claim 1, wherein the pump housing has an outer diameter larger than 500 mm.

20. A mounting accessory for use with a peristaltic pump according to claim 1, wherein the pump hose is mounted on a ring prior to installation in the housing and in this way, is given a curvature that corresponds at least substantially to the curvature that the pump hose has inside the pump housing.

21. A method of making of a pump hose for a peristaltic pump according to claim 1, wherein the material of the pump hose is arranged on a production mandrel that is bent at least partially in a circle and has preferably a circular cross section shape, after which the material on the bent production mandrel is processed into the finished hose, especially by vulcanization, and it then has a curvature such that it can be placed at least substantially free of stress inside the pump housing.

22. The method according to claim 21, wherein the production mandrel in its at least partial circular curvature has an outer diameter that corresponds at least substantially to the diameter of the pump housing at the inner wall against which the finished pump hose rests during operation, minus the wall thickness of the hose.

Description

[0039] In the following, preferred sample embodiments of the invention shall be explained more closely with the aid of the enclosed drawings in which.

[0040] FIG. 1 is a view into the pump housing after removing one of the end walls;

[0041] FIG. 2 is a perspective view of the pump housing with the pivot motor;

[0042] FIG. 3 is a top view of the pump housing seen from the drive side;

[0043] FIG. 4 is a view with pump housing and mounted material container;

[0044] FIG. 5 shows the inside (section) of the pump hose with the two bodies, in this case two balls;

[0045] FIG. 6 shows an embodiment in which rollers are used for straightening out the flattened hose, enclosing the hose in pair on both sides of the pump head;

[0046] FIG. 7 shows a mounting accessory of pump hose and ring, maintaining the hose curved.

[0047] A pump housing 1 comprises substantially a cylindrical wall 2 and a circular end wall 3. In the end wall 3 are situated the ports 4 that serve as inlet and outlet, depending on the position of the diverter valve 5.

[0048] In FIG. 1, a driving core 6 is situated inside the pump housing 1 that in combination with the pump head 7 moves the roller or the sliding shoe 8 in circular manner, pivoting in the pump housing 1. In this process, the roller or the sliding shoe 8 flattens the pump hose 9, since this lies against the wall of the pump housing 2 and forms a partitioned annular space. The pump hose 9 lies against the cylinder inner surface 2 and is connected to pipe ends 10 and 11, whose outer mouths form the port 4 or pass into the port 12 across the diverter valve.

[0049] Moreover, a roller or sliding shoe 8 extends between the driving core 6 and the cylindrical wall 2, flattening the pump hose 9 in back and forth manner and forming a suction or compression chamber depending on the direction of rotation; in dependence on the position of the diverter valve 5.

[0050] The roller or the sliding shoe 8 always remains in contact with the pump hose 9 and forms a separation point between the suction and compression chamber; this is determined by the position of the diverter valve 5 and the rotation direction of the pump head 7.

[0051] In the end wall 3 there are two ports 4 and 12 with a circular cross section. The port 4 or 12 freed up by the diverter valve 5 serve as the material inlet during normal operation.

[0052] In FIG. 2 moreover the port 4 is visible from the outside of the end wall 3, while the other port 12 is concealed by a connection piece 13; or by the diverter valve 5. At this connection piece the material emerges, for the most part into a flexible hose that serves as a discharge line for the thick material emerging from the port 12. The diverter valve is shown here in a position in which the connection piece 13 is standing above the left port in the figure. Upon reversal of direction of the pump head 7, the diverter valve 5 will then be pivoted over the right port 4.

[0053] The pivot axis of the diverter valve 5, looking radially, lies between the pivot axis of the pump head 7 and the ports 4/12 and it has a circumferential position lying between the ports 4/12.

[0054] A reversed pump mode can also be realized, in which the function of the ports 12 and 4 is interchanged; now, the thick material is suctioned in through the port covered by the diverter valve 5 that normally serves as a discharge line for the thick material, and the material emerges through the port not covered. This is accomplished by a changing of the dependency of the diverter valve position on the rotation direction of the pump head 7. Thus, by inverting the dependency, the pump operation can be reversed.

[0055] FIG. 3 is a top view of the side of the pump housing with the pivot motor 14 of the pump head facing the observer. One can also see the arrangement of the diverter valve 5 and the ports 4 and 12.

[0056] The pins 16 serve as a pivot point of the pump housing 2, and in this way, the pump housing or the entire unit can be pivoted by hand. The cleaning and maintenance of the pump is always done in a user-friendly position. In this way, a complete emptying and cleaning of the pump is possible, with no additional cleaning ports.

[0057] In FIG. 4 one sees the peristaltic pump with oscillating drive and a diverter valve with a mounted material container 15. This allows the pump to be flange-mounted on a machine or to be used without container as a submerged pump. The material container here is semicircular in cross section with a central indentation, surrounding the drive 14. The material container can also extend for an angle range of more than 180 degrees, e.g., it can be a complete circle extending for 360 degrees.

[0058] In FIG. 5 one sees the pump hose 9 in cross section; one recognizes here the balls 17 to the right and left of the roller 8 that serve to straighten out the flattened hose once more from the inside.

[0059] On the other hand, FIG. 6 shows a design in which a pair of two rollers 18 each is arranged on either side of the sliding shoe or roller 8 of the pump head 7 for straightening out the flattened hose from the outside. The rollers 18 have radially directed axes of rotation and are arranged axially opposite each other, preferably with a spacing corresponding to the outer diameter of the hose.

[0060] FIG. 7 shows a mounting accessory, formed from a ring 19, on which a pump hose 9 is placed on the outside and secured on the ring 19 with belts 20 at least at the hose ends. Thanks to the ring 19, the hose 9 is held in a curvature that corresponds to the curvature that the hose 9 must have inside the pump housing. When such a mounting accessory is used, the installer does not need to place the hose in the required curvature by himself. Such a mounting accessory can be installed in its entirety in the pump housing for a hose replacement, after which the belts are loosened and removed.

[0061] For the pivoting of the pump head, a hydraulic pivot motor or a gear motor would be the best variant, since it is compact and theoretically can work in the medium. Large forces can also be achieved. This also allows the peristaltic pump with an oscillating drive and a diverter valve to work in water, for example.

[0062] For smaller peristaltic pumps with oscillating drive and a diverter valve, electric drives are also possible, of course.