Constant volume seal-free reciprocating pump

• US 4,102,610 A
• Filed: 09/03/1976
• Issued: 07/25/1978
• Est. Priority Date: 09/03/1976
• Status: Expired due to Term

• Current Assignee: John Taboada, Marvin H. Lindsey
• Original Assignee: John Taboada, Marvin H. Lindsey
• Inventors: Taboada, John, Lindsey, Marvin H.
• Primary Examiner(s): Husar, C. J.
• Application Number:
  US05/720,465
• Time in Patent Office: 690 Days
• Field of Search: 415/214, 417/415, 417/417, 128/1 D, 128/DIG. 3, 128/273, 3/1.7, 318/128, 318/130, 318/132
• US Class Current: 417/417
• CPC Class Codes: F04B 17/046 the fluid flowing through the moving part of the motor
• CPC Class Codes: F04B 53/102 Disc valves
• CPC Class Codes: H02K 33/02 with armatures moved one way by energisation of a single coil system and returned by mechanical force, e.g. by springs

Abstract

A reciprocating pump having a piston completely enclosed by and moving within a cylinder. The pumping action is provided by the interaction between a magnetic component embedded in the piston and an external varying magnetic field produced by a permanent magnet, solenoid, etc. The necessary back-and-forth motion is produced by momentarily offsetting the gravitational force by the spatial driving or time variation of the magnetic field and a suitable combination of valves is provided to control the fluid flow through the cylinder.

Claims

1. An electromagnetic reciprocating pump for handling biomedical fluids, gases, mixtures of gases and fluids and the like under sterile conditions free of contamination, said pump comprising a vertically oriented hollow elongate cylinder having a check valve at the lower extremity thereof, a tubular elongate piston slidably positioned in said cylinder for vertical movement therein, a magnetic component fixedly attached to said piston for movement therewith, a solenoid coil surrounding the outside of said cylinder in close proximity thereto for producing an external magnetic field, said solenoid coil being positioned immediately above the magnetic component attached to said piston to cause upward movement of said piston by attracting the magnetic component attached thereto, valve means located in said piston for controlling the flow of fluids through said pump in response to cyclic applications of the magnetic field thereto, and a power supply for alternately energizing and deenergizing the solenoid coil producing the external magnetic field including a serially connected transformer and full wave rectifier, a Zener diode connected across said rectifier, a timer operating in the astable mode powered by said power supply, and a relay controlled by the output of said timer for momentarily connecting said power supply to the solenoid coil, such that said piston is caused to move upward in response to magnetic attraction of said magnetic component by the external magnetic field and to move downward under the influence of gravity when the magnetic field is deenergized.