ELECTROMAGNETIC PUMP

• US 3,601,509 A
• Filed: 08/11/1969
• Issued: 08/24/1971
• Est. Priority Date: 08/11/1969
• Status: Expired due to Term

• Current Assignee: Morton A. Kreitchman
• Original Assignee: Morton A. Kreitchman
• Inventors: Kreitchman, Morton A.
• Primary Examiner(s): Walker, Robert M.
• Application Number:
  US04/849,067
• Time in Patent Office: 743 Days
• Field of Search: 417/417 103/53,178,192 230/55
• 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 53/1032 Spring-actuated disc valves F04B53/1022, F04B53/103 take precedence

Abstract

The present invention includes an electromagnetically responsive pump including a spring-biased piston assembly reciprocatory within a cylinder. Inlet and outlet fittings formed with inlet and outlet ports, respectively, are secured to opposite ends of the cylinder. An electromagnetic coil surrounds a portion of the cylinder and, when energized, is operative to move the piston assembly against its spring bias. The piston assembly is formed with a fluid-conducting slot which communicates with said outlet port. Sealing means for sealing said slot from the inlet port comprise a sealing ring engaging inner walls of the cylinder, and flanges forming part of said piston assembly spaced from and disposed on opposite sides of the sealing ring, said flanges movably engaging first and second portions of the sealing ring during suction and return strokes of the piston assembly, said slot being sealed from the inlet port during the suction stroke and communicating therewith during the return stroke. A springbiased check valve normally seals the inlet port.

Claims

1. A pump comprising:

a. a housing defining an internal pumping chamber and having inlet and outlet ports communicating with said chamber;

b. a piston moveable in first and second directions within said chamber and having a fluid conducting opening extending between portions of said chamber proximal to said outlet port and other portions of said chamber;

c. a seAling member connected to said piston to engage the inner walls of said chamber during movement of said piston in said first direction;

d. means connected to said piston for supporting said sealing member when said piston moves in said first direction, said means having a contoured lateral surface adjacent said member to deflect said member substantially in conformity with the shape of said surface;

e. means for biasing said piston in said second direction; and

f. electromagnetic means for moving said piston in said first direction.

2. The pump as recited in claim 1, wherein said sealing member comprises a flexible disc concentric with said piston and having a diameter greater than the diameter of said pumping chamber.

3. The pump as recited in claim 1, wherein said sealing member comprises a flexible annular blade concentric with said piston and having a diameter greater than the diameter of said pumping chamber.

4. The pump as recited in claim 1 wherein said sealing member comprises a peripheral portion pivotally arranged relative to said piston such that pressure exerted on said portion when said piston moves in said first direction tends to pivot said portion against the inner walls of said chamber.

5. The pump as recited in claim 4, wherein said contoured surface comprises an annular shelf inclined substantially in said first direction and engageable with the proximal lateral surface of said portion when said piston moves in said first direction.

6. The pump as recited in claim 1, wherein said piston comprises a substantially cylindrical member having a central bore which opens at one end of said member proximal to said outlet port, said bore communicating substantially along its entire length with said fluid conducting opening.

7. The pump as recited in claim 6, wherein said fluid conducting opening extends substantially radially between said bore and said pumping chamber.

8. The pump as recited in claim 1, wherein said biasing means comprises a helical compression spring, one end of which is disposed within said bore and the other end of which bears against a portion of the inner boundary of said pumping chamber adjacent said outlet port.