PUMPS

• US 3,658,445 A
• Filed: 06/11/1970
• Issued: 04/25/1972
• Est. Priority Date: 06/12/1969
• Status: Expired due to Term

• Current Assignee: Geoffrey D.S. Horsfall, Prockter T. Pulman
• Original Assignee: Geoffrey D.S. Horsfall, Prockter T. Pulman
• Inventors: Pulman, Prockter T., Horsfall, Geoffrey D. S.
• Primary Examiner(s): Croyle, Carlton R.
• Assistant Examiner(s): Gluck, Richard E.
• Application Number:
  US05/045,488
• Time in Patent Office: 684 Days
• Field of Search: 417/474,475
• US Class Current: 417/474
• CPC Class Codes: F04B 43/082 the tubular flexible member being pressed against a wall by a number of elements, each having an alternating movement in a direction perpendicular to the axes of the tubular member and each having its own driving mechanism

Abstract

A peristaltic type pump comprises a reciprocating pumping element which alternately pinches and releases a flexible-walled tube, and, on either side of the pumping element, reciprocating inlet and outlet closure elements respectively. When the pumping element pinches the tube during a pumping stroke the inlet closure element pinches the tube to close it while the outlet closure member releases the tube, and during induction strokes, as the pumping element releases the tube, the inlet closure element is open, while the outlet element is closed. Synchronised operation of the elements is conveniently effected by respective cams.

Claims

1. A pump of the peristaltic type which effects pumping by the deformation of a flexible-walled tube, comprising, in combination, a pumping element cooperating with a portion of the flexible-walled tube, said pumping element comprising a pad extending generally in the longitudinal direction of said portion of the flexible tube and having a tube-engaging face, and a transverse rib on said tube engaging face;

first operating means for reciprocating the pumping element so as cyclically to pinch and release said portion of the tube, thereby to effect pumping and induction strokes successively of the pump, the rib of the pumping element engaging the tube in each pumping cycle before the remainder of said tube-engaging face of said pad;

inlet and outlet closure elements mounted on either side of the pumping element;

two second operating means for effecting reciprocation of said inlet and outlet closure elements, respectively, between respective closed positions in which said closure elements pinch the tube to prevent flow therethrough and open positions in which said closure elements permit flow through the tube;

means interRelating the operation of said first and second operating means so that during pumping strokes of the pumping element the inlet closure element is in its closed position and the outlet closure element in its open position, while during induction strokes the inlet closure element is in its open position and the outlet closure element in its closed position; and

stroke adjustment means for varying the stroke of said pumping element, said pumping element engaging the tube only by said transverse rib in the position of said adjustment means corresponding to minimum pumping stroke.

2. Pump as claimed in claim 1, wherein the said first and second operating means include respective rotary cams and respective pivoted lever arms engageable by the rotary cams and carrying the pumping element and the respective closure elements, the pivot axis of each said lever arm being disposed between said portion of said flexible tube and that part of the said lever arm which engages the respective rotary cam.

3. Pump as claimed in claim 1, wherein the pump has a housing and comprises an anvil member having an anvil surface upon which the said portion of said flexible-walled tube lies and against which said tube is pressed when engaged by the pumping element and by the respective closure elements;

and means mounting said anvil member in said housing removable as a unit from said housing permitting access to the flexible-walled tube.

4. A pump of the peristaltic type which effects pumping by the deformation of a flexible-walled tube, comprising, a pumping element cooperating with a portion of the flexible-walled tube;

first operating means for reciprocating the pumping element so as cyclically to pinch and release said portion of the tube, thereby to effect pumping and induction strokes successively of the pump;

inlet and outlet closure elements mounted on either side of the pumping element;

two second operating means for effecting reciprocation of said inlet and outlet closure elements, respectively, between respective closed positions in which said closure elements pinch the tube to prevent flow therethrough and open positions in which said closure elements permit flow through the tube, said second operating means including pivoted lever arms, respectively;

means pivotally connecting each respective closure element to the respective lever arm for rocking movement about an axis parallel to the pivotal axis of said lever arm;

means resiliently biasing said lever arms to urge the respective closure elements into pinching engagement with said portion of the tube, and rotary cams engaging said lever arms, respectively, and adapted to rock the latter in opposition to their resilient biasing means to effect reciprocation of the closure elements upon rotation of said cams;

means interrelating the operation of said first and second operating means so that during pumping strokes of the pumping element the inlet closure element is in its closed position and the outlet closure element in its open position, while during induction strokes the inlet closure element is in its open position and the outlet closure element in its closed position.

5. Pump as claimed in claim 4 wherein the first operating means for reciprocating the pumping element comprise a lever arm carrying the pumping element, means resiliently biassing the lever arm to urge the pumping element into engagement with said portion of the tube and a rotary cam engaging said lever arm and adapted to rock the latter in opposition to said resilient biassing means to reciprocate the pumping element upon rotation of said cam, and a common shaft supporting the respective lever arms of said first, and second operating means for rocking movement about the axis of said common shaft.

6. Pump as claimed in claim 5, including a common cam shaft supporting the respective cams of said operating means.

7. A pump of the peristaltic type which effects pumping by the deformation of a flexible-walled tube, comprising, a pumping element cooperating wiTh a portion of the flexible-walled tube;

first operating means for reciprocating the pumping element so as cyclically to pinch and release said portion of the tube, thereby to effect pumping and induction strokes successively of the pump;

inlet and outlet closure elements mounted on either side of the pumping element;

two second operating means for effecting reciprocation of said inlet and outlet closure elements, respectively, between respective closed positions in which said closure elements pinch the tube to prevent flow there through and open positions in which said closure elements permit flow through the tube;

means interrelating the operation of said first and second operating means so that during pumping strokes of the pumping element the inlet closure element is in its closed position and the outlet closure element in its open position, while during induction strokes the inlet closure element is in its open position and the outlet closure element in its closed position;

eccentric release cam means; and

means rotating said release cam means to effect simultaneous movement of the pumping element and the two closure elements out of engagement with said portion of the tube to facilitate replacement of the tube, said release cam means being out of engagement with said pumping and closure elements during normal operation of the pump.

8. Pump as claimed in claim 7, comprising a removable anvil member having a surface upon which rest the portions of the flexible-walled tube engageable by said pumping and closure elements when the anvil member is in a normal operative position;

and latching means retaining said anvil member in said operative position, said latching means being releasable automatically when said pumping element and said closure elements are out of engagement with said tube to permit removal of the anvil member.

9. Pump as claimed in claim 7, wherein said first operating means include a lever arm carrying the pumping element;

and comprising means for varying the stroke of said pumping element including a presettable rotatable cam engageable with said lever arm, said presettable rotatable cam comprising part of said release cam means and including a common adjusting member operatively connected to both said rotatable cam and the release cam means for selective adjustment thereof.

10. Pump as claimed in claim 7, comprising a housing provided with an opening;

a removable anvil member;

means mounting said anvil member in said housing removable from said housing through said opening, said anvil member, in its fully mounted position in said housing, supporting the portions of said flexible-walled tube with which said pumping and closure elements cooperate.

11. Pump as claimed in claim 10, wherein said anvil member includes means for retaining said flexible walled tube thereon in contact with an anvil surface of said anvil member, so that the tube is removable for inspection together with said anvil member, when said pumping and closure elements are out of engagement with said tube.

12. A pump of the peristaltic type which effects pumping by the deformation of a flexible-walled tube, comprising, a pumping element cooperating with a portion of the flexible-walled tube;

first operating means for reciprocating the pumping element so as cyclically to pinch and release said portion of the tube, thereby to effect pumping and induction strokes successively of the pump, said first operating means including a lever arm carrying said pumping element;

means resiliently biasing said lever arm to urge said pumping element into engagement with said portion of the tube;

a rotary cam engaging said lever arm and adapted to rock the latter in opposition to said resilient biasing means for reciprocating said pumping element upon rotation of said cam, and a presettable rotatable cam engageable with said lever arm and determining the stroke of said pumping element in operation of the pump;

inlet and outlet closure elements mounted on either side of the pumping element;

twO second operating means for effecting reciprocation of said inlet and outlet closure elements, respectively, between respective closed positions in which said closure elements pinch the tube to prevent flow therethrough and open positions in which said closure permit flow through the tube;

means interrelating the operation of said first and second operating means so that during pumping strokes of the pumping element the inlet closure element is in its closed position and the outlet closure element in its open position, while during induction strokes the inlet closure element is in its open position and the outlet closure element in its closed position.

13. A pump of the peristaltic type which effects pumping by the deformation of a flexible-walled tube, comprising, a pumping element cooperating with a portion of the flexible-walled tube;

first operating means for reciprocating the pumping element so as cyclically to pinch and release said portion of the tube, thereby to effect pumping and induction strokes successively of the pump;

inlet and outlet closure elements mounted to either side of the pumping element;

two second operating means for effecting reciprocation of said inlet and outlet closure elements, respectively, between respective closed positions in which said closure elements pinch the tube to prevent flow therethrough and open positions in which said closure elements permit flow through the tube;

means interrelating the operation of said first and second operating means so that during pumping strokes of the pumping element the inlet closure element is in its closed position and the outlet closure element in its open position, while during induction strokes the inlet closure element is in its open position and the outlet closure element in its closed position, a housing enclosing said pumping and closure elements and provided with an opening;

a removable anvil member;

means mounting said anvil member in said housing slidable into and slidable out of said housing through said opening, said anvil member, in its fully mounted position in said housing, supporting theportions of said flexible-walled tube with which said pumping and closure elements cooperate, and means on said anvil member for retaining said flexible-walled tube in contact with said anvil surface, whereby the length of said tube with which said pumping and closure elements cooperate is removable from said housing along with said anvil member.