FLUID PUMP

• US 3,791,768 A
• Filed: 06/16/1972
• Issued: 02/12/1974
• Est. Priority Date: 06/16/1972
• Status: Expired due to Term

• Current Assignee: Recovery Engineering, Incorporated (The Procter & Gamble Company)
• Original Assignee: William F. Wanner
• Inventors: Wanner, William F.
• Primary Examiner(s): Croyle, Carlton R.
• Assistant Examiner(s): Sher, Richard
• Application Number:
  US05/263,692
• Time in Patent Office: 606 Days
• Field of Search: 417/395,393,401,344,345 91/304,313X,329X,445,446 137/99,624.14,625.69X
• US Class Current: 417/393
• CPC Class Codes: F01L 25/063 the auxiliary valve being actuated by the working motor-piston or piston-rod
• CPC Class Codes: F04B 43/0736 with two or more pumping chambers in parallel
• CPC Class Codes: F04B 53/1032 Spring-actuated disc valves F04B53/1022, F04B53/103 take precedence
• CPC Class Codes: Y10T 137/2516 Interconnected flow displacement elements
• CPC Class Codes: Y10T 137/8671 With annular passage [e.g., spool]

Abstract

A pair of fluid pressure operated diaphragm pumps, the diaphragms of which are disposed in separate housings and connected together for common reciprocatory movements. A valve body provides support for the housings and for a connection between the diaphragms. The valve body contains a reversing valve, a pilot valve, and a pressure relief valve in a pump operating fluid circuit which includes primary pressure chambers in the housings at one side of the diaphragms. The housings define secondary chambers at the other side of the diaphragms for pumping fluids isolated from the pump operating fluids.

Claims

1. A fluid pump comprising:

a. a main body;

b. a pair of housings each disposed at an opposite side of said body;

c. a pair of pumping diaphragms one in each of said housings and dividing the interior of each housing into primary and secondary pressure chambers;

d. inlet and discharge manifolds disposed to communicate with said secondary pressure chambers and havIng one-way check valves therein and secondary inlet and outlet ports respectively;

e. means connecting said diaphragms together for common reciprocatory movement in their respective housings;

f. said main body defining primary inlet and outlet ports and passage means connecting said primary inlet and outlet ports to said primary chambers, said passage means including pilot and reversing valve chambers, said primary inlet port being adapted for connection to a source of fluid under pressure;

g. and a pilot valve and a reversing valve movably mounted in respective ones of said pilot and reversing valve chambers;

h. said pilot valve being movable alternately in opposite directions responsive to movement of said diaphragms to control flow of fluid to said reversing valve chamber;

said pilot valve comprising a spool axially movable in said pilot valve chamber and having a diametrically reduced portion within said pilot valve chamber, a tubular member encompassing said reduced portion and axially movable relative to said main body and spool, and stop means in said pilot valve chamber limiting movements of said tubular member axially of said spool;

i. said reversing valve being fluid pressure operated and operative responsive to movement of said pilot valve in opposite directions to direct flow of fluid from said primary inlet and alternately to said primary pressure chambers and from alternating primary pressure chambers to said outlet port.

2. The fluid pump defined in claim 1 in which said passage means includes a valve passage intermediate said primary inlet and outlet ports, characterized by an adjustable pressure relief valve in said valve passage operative to by-pass flow of fluid around said pilot and reversing valves responsive to predetermined pressure in said primary pressure chambers.

3. The fluid pump defined in claim 1, in which said stop means comprises a pair of axially spaced stop elements projecting radially outwardly of said diametrically reduced spool portion and each engageable with a different end of said tubular member.