Radial piston pump
AssigneeKitronic Gesellschaft fur Mikrotechnik in der Medizin mbH
InventorHarm Koelln
Life of this patent
Estimating the term…
Abstract
A radial piston pump has a pump body with two pump chambers lying in a straight line. In the pump chambers pistons reciprocate along this same straight line. The pump pistons are coupled to an actuator which is rotatable about an axis which bisects the straight line, and reciprocates the pistons in opposite directions. Each pump chamber is connected to an intake fluid duct and a discharge fluid duct, and the intake ducts are connected to a common main intake duct and the discharge fluid ducts to a common main discharge duct. An actuator controls operating components which co-operate with valve arrangements for the opening and closing of the fluid ducts.
Claims18
A radial piston pump comprising:
- a pump body defining first and second pump chambers, said chambers lying on a common straight line;
- first and second pistons disposed in said first and second chambers for reciprocation in line with each other along said common straight line;
- an actuator rotatable about an axis of rotation, said axis bisecting said common straight line;
- each chamber having an inlet fluid duct and an outlet fluid duct adjacent the ends thereof closest to said axis;
- said inlet fluid ducts connected to a main inlet fluid duct, and said outlet fluid ducts connected to a main outlet fluid duct;
- valve means for controlling fluid communication between said inlet ducts and main inlet duct, and outlet ducts and main outlet duct;
- and
- means for connecting said actuator to said pistons and valve means so that upon rotation of said actuator about said axis of rotation said pistons are moved in opposite directions, and said valve means are operated so that only one inlet duct at a time is connected to said main inlet duct, and only one outlet duct at a time to said main outlet duct.
A method of controlling a pump to pump small amounts of liquid in a precisely controlled manner, using a pump body having first and second in line pump chambers, and first and second in line pistons reciprocal in the chambers, a main inlet duct, a main outlet duct, and an inlet and outlet duct connected from each chamber to the main inlet and outlet ducts, said method comprising the steps of:
- (a) reciprocating the pistons in the chambers so that as one is being withdrawn from a chamber the other is being inserted into the chamber;
- and
- (b) during the practice of step (a) connecting the inlet ducts of the first piston to the main inlet duct during the majority of the time the outlet duct of the second piston is connected to the main outlet duct, and vice versa, by connecting a pump chamber to a main intake duct or main discharge duct only when the piston in that chamber is at a standstill.
A radial piston pump comprising:
- a pump body defining first and second pump chambers, said chambers aligned on a common straight line;
- first and second pistons disposed on said first and second chambers for reciprocation in line with each other along said common straight line;
- an actuator rotatable about an axis of rotation, said axis bisecting said common straight line, said actuator comprising first and second control discs mounted on opposite sides of said body, each control disc concentric with said axis of rotation;
- each chamber having an inlet fluid duct and an outlet fluid duct;
- valve means for controlling fluid communication between said inlet and outlet ducts;
- and
- means for connecting said control discs to said pistons and valve means so that upon rotation of said actuator about said axis of rotation said pistons are moved in opposite directions, and said valve means are operated so that fluid is being supplied to one inlet duct during the majority of the time that fluid is being exhausted from the opposite outlet duct, and vice versa.
Dependencies are inferred from the claim text.