Peristaltic pump

• US 7,625,189 B2
• Filed: 03/09/2005
• Issued: 12/01/2009
• Est. Priority Date: 03/10/2004
• Status: Expired due to Fees

• Current Assignee: Zaijun Cheng
• Original Assignee: Zaijun Cheng
• Inventors: Cheng, Zaijun
• Primary Examiner(s): Kramer; Devon C
• Assistant Examiner(s): Bobish; Christopher
• Application Number:
  US10/592,104
• Publication Number:
  US 20070148022A1
• Time in Patent Office: 1,728 Days
• Field of Search: 417/474, 417/476, 417/477.1, 417/477.3, 417/477.7, 417/477.8
• US Class Current: 417/474
• CPC Class Codes: F04B 43/1253 by using two or more rollers as squeezing elements, the rollers moving on an arc of a circle during squeezing

Abstract

A peristaltic pump, for propelling liquid through a flexible pump tube, includes an outer casing having a guiding channel wherein an operating portion of the pump tube extends along the guiding channel. The peristaltic pump further includes at least two pressuring rollers supported at the outer casing in a radially movable manner which can move outwardly to press against the operating portion of the pump tube. A center driving mechanism is supported at a center portion of the outer casing to radially push the pressure rollers and to drive the pressuring rollers to concurrently rotate such that the pressuring rollers roll against the operating portion of the pump tube for continuously propelling the fluid in the pump tube in the direction of rotation.

Claims

1. A peristaltic pump for propelling liquid, comprising:

an outer casing having a guiding channel and defining a circular path therealong;

a flexible pump tube, which is adapted for allowing said liquid flowing therealong, having an operating portion extended along said guiding channel of said outer casing;

a driving shaft;

at least two pressuring rollers spacedly and eccentrically supported at said outer casing in a radially movable manner for rotatably moving along said circular path, wherein said two pressuring rollers are arranged to radially and outwardly moved to press against said operating portion of said pump tube along said circular path; and

a transmission unit, which comprises at least first through fifth driving plates mechanically communicated with said driving shaft in a side-by-side manner, wherein each of said driving plates has at least one peripheral indention formed thereon, and a pedal slot having a predetermined arc length formed in a central portion of said corresponding driving plate for connecting with said driving shaft, wherein said peripheral indention of said driving plate has a predetermined depth for at least partially receiving said pressuring roller therein, wherein when said driving shaft is driven to rotate, said driving plates are arranged to rotate sequentially for sequentially engaging with and disengaging from said pressing rollers by said corresponding peripheral indention, so as to allow said pressing rollers to be sequentially biased in a radial direction for biasing against a corresponding portion of said flexible pump tube, wherein said third driving plate is sandwiched between said second and said fourth driving plates, wherein said arc length of said pedal slot of each of said second and said fourth driving plates is larger than said arc length of said pedal slot of said third driving plate, wherein said pressuring rollers are sequentially driven to bias against different portions of said flexible pump tube when said driving shaft rotates, so as to maximize an efficiency and effectiveness of pumping said liquid while minimizing normal wear and tear of said flexible pump tube.

2. The peristaltic pump, as recited in claim 1, wherein said second, said third and said fourth driving plates are sandwiched between said first and said fifth driving plate, wherein said arc length of said pedal slot of each of said first and said fifth driving plates is larger than said arc length of said pedal slot of each of said second and said fourth driving plates.

3. The peristaltic pump, as recited in claim 1, wherein at least two of said pressuring rollers are symmetrically and planetary supported at said outer casing in a radially movable manner.

4. The peristaltic pump, as recited in claim 2, wherein at least two of said pressuring rollers are symmetrically and planetary supported at said outer casing in a radially movable manner.

5. The peristaltic pump, as recited in claim 1, further comprising a retainer retaining a radial movement of said pressuring rollers, wherein said retainer further has a retainer rod and a retainer slot to further stabilize said pressuring roller.

6. The peristaltic pump, as recited in claim 2, further comprising a retainer retaining a radial movement of said pressuring rollers, wherein said retainer further has a retainer rod and a retainer slot to further stabilize said pressuring roller.

7. The peristaltic pump, as recited in claim 4, further comprising a retainer retaining a radial movement of said pressuring rollers, wherein said retainer further has a retainer rod and a retainer slot to further stabilize said pressuring roller.

8. The peristaltic pump, as recited in claim 1, wherein a corner of said peripheral indention of each of said driving plates is a smooth corner which tangents out with an outer diameter of said corresponding driving plate.

9. The peristaltic pump, as recited in claim 4, wherein a corner of said peripheral indention of each of said driving plate is a smooth corner which tangents out with an outer diameter of said corresponding driving plate.

10. The peristaltic pump, as recited in claim 7, wherein a corner of said peripheral indention of each of said driving plate is a smooth corner which tangents out with an outer diameter of said corresponding driving plate.

11. The peristaltic pump, as recited in claim 4, wherein a thickness of said combined driving plates is approximately equal to a width of said pressuring roller, and is approximately equal to two times of a width of said compressed pump tube.

12. The peristaltic pump, as recited in claim 7, wherein a thickness of said combined driving plates is approximately equal to a width of said pressuring roller, and is approximately equal to two times of a width of said compressed pump tube.

13. The peristaltic pump, as recited in claim 10, wherein a thickness of said combined driving plates is approximately equal to a width of said pressuring roller, and is approximately equal to two times of a width of said compressed pump tube.

14. The peristaltic pump, as recited in claim 7, wherein said peripheral indention of each of said driving plates is located at a circumference edge of said driving plate and said peripheral indention provides a space for said pressuring roller to receive in and has a depth approximately equal to a distance that said compressed pump tube needs to recover from.

15. The peristaltic pump, as recited in claim 10, wherein said peripheral indention of each of said driving plates is located at a circumference edge of said driving plate and said peripheral indention provides a space for said pressuring roller to receive in and has a depth approximately equal to a distance that said compressed pump tube needs to recover from.

16. The peristaltic pump, as recited in claim 13, wherein said peripheral indention of each of said driving plates is located at a circumference edge of said driving plate and said peripheral indention provides a space for said pressuring roller to receive in and has a depth approximately equal to a distance that said compressed pump tube needs to recover from.