Rotary peristaltic pump
First Claim
1. A rotary peristaltic pump adapted to be fitted with motor drive means and pump tubing for connection to a source of fluid, said pump comprising:
- a rotor member adapted for operative coupling to the motor drive means and having a circular head section housing a plurality of pump tubing-compressing idler rollers in approximately equidistant radially disposed positions for idle rotation axially parallel to the axis of rotation of the rotor member in the course of rotation of said rotor member, said circular head section having an inner flange member and an outer flange member joined in spaced-apart relationship by an axial cylindrical mid-section so as to form a circumferential recess defining a race compartment of the pump tubing-compressing idler rollers, said pump tubing-compressing idler rollers positioned between said inner flange member and outer flange member for idle rotation axially parallel to the axis of rotation of the rotor member by the opposite ends of each said pump tubing-compressing idler roller engaging in recess bearings in the inner flange member and outer flange member respectively, and a minor portion of the circumferential face of each said pump tubing-compressing idler roller disposed in an axially parallel idler roller thrust-bearing groove in the circumferential face of said axial cylindrical mid-section, with the major portion of the circumferential face of each pump tubing-compressing idler roller protruding into said race compartment; and
a stator member having a base section and a wall section with inner faces which define an axial opening for accommodating the circular head section of the rotor member and having pump tubing entry and exit ports in the wall section for tangential communication with said race compartment of the rotor member;
said pump tubing being fitted to the pump by loading into the race compartment via said pump tubing entry port, then passing around the race compartment to exit therefrom via said pump tubing exit port, whereby the portion of the pump tubing in said race compartment is successively contacted by the protruding circumferential faces of the pump tubing-compressing idler rollers in the course of rotation of said rotor member so as to be compressed between said inner face of the stator member wall section and said circumferential faces of the pump tubing-compressing idler rollers for effective peristaltic pumping of fluid in said pump tubing, and the circumferential faces of the pump tubing-compressing idler rollers engaging the axially parallel roller thrust-bearing grooves in the circumferential face of the axial cylindrical mid-section so as to minimize axial flexural deformation of each pump tubing-compressing idler roller induced by compression of the pump tubing.
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Accused Products
Abstract
A rotary peristaltic pump comprises a rotor member (4) fitted in a stator member (5) and coupled to a motor (2) and having a cylindrical head section (6) housing a plurality of pump tube compressing idler rollers (7) equidistantly radially disposed around the head section, with their longitudinal axes parallel to the axis of the head section. The rollers are positioned in an annular recess (8) in the periphery of the head section, the root periphery of the recess being grooved (17) to accept each compressing idler roller such that a substantial part of each roller protrudes into the annular recess. The stator member (5) comprises a base section (9) and wall section (10) defining an axial opening (11) to accommodate the cylindrical head section and has pump tube entry ports (12, 13) in the wall (10) for tangential communication with the annular recess. Stator member (5) may slide along the rotor shaft (31) to facilitate service to the rotor elements and tube. Rotor member (4) may also include pump tube stabilizing idler rollers in the annular recess and a magnetic element to facilitate pump control in conjunction with an electronic control circuit.
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Citations
20 Claims
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1. A rotary peristaltic pump adapted to be fitted with motor drive means and pump tubing for connection to a source of fluid, said pump comprising:
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a rotor member adapted for operative coupling to the motor drive means and having a circular head section housing a plurality of pump tubing-compressing idler rollers in approximately equidistant radially disposed positions for idle rotation axially parallel to the axis of rotation of the rotor member in the course of rotation of said rotor member, said circular head section having an inner flange member and an outer flange member joined in spaced-apart relationship by an axial cylindrical mid-section so as to form a circumferential recess defining a race compartment of the pump tubing-compressing idler rollers, said pump tubing-compressing idler rollers positioned between said inner flange member and outer flange member for idle rotation axially parallel to the axis of rotation of the rotor member by the opposite ends of each said pump tubing-compressing idler roller engaging in recess bearings in the inner flange member and outer flange member respectively, and a minor portion of the circumferential face of each said pump tubing-compressing idler roller disposed in an axially parallel idler roller thrust-bearing groove in the circumferential face of said axial cylindrical mid-section, with the major portion of the circumferential face of each pump tubing-compressing idler roller protruding into said race compartment; and a stator member having a base section and a wall section with inner faces which define an axial opening for accommodating the circular head section of the rotor member and having pump tubing entry and exit ports in the wall section for tangential communication with said race compartment of the rotor member; said pump tubing being fitted to the pump by loading into the race compartment via said pump tubing entry port, then passing around the race compartment to exit therefrom via said pump tubing exit port, whereby the portion of the pump tubing in said race compartment is successively contacted by the protruding circumferential faces of the pump tubing-compressing idler rollers in the course of rotation of said rotor member so as to be compressed between said inner face of the stator member wall section and said circumferential faces of the pump tubing-compressing idler rollers for effective peristaltic pumping of fluid in said pump tubing, and the circumferential faces of the pump tubing-compressing idler rollers engaging the axially parallel roller thrust-bearing grooves in the circumferential face of the axial cylindrical mid-section so as to minimize axial flexural deformation of each pump tubing-compressing idler roller induced by compression of the pump tubing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification