US2354958A

US2354958A - Diaphragm pump

Info

Publication number: US2354958A
Application number: US489042A
Authority: US
Inventors: Erwin F Loweke
Original assignee: Hydraulic Brake Co
Current assignee: Hydraulic Brake Co
Priority date: 1943-05-29
Filing date: 1943-05-29
Publication date: 1944-08-01
Anticipated expiration: 1961-08-01

Description

Aug. 1, 1944.

E. F. LOWEKE DIAPHRAGM PUMP Filed May 29, 1945 M M m 6 3 a 6 MI 0 MIN? \5 M Q BTTOBNEX Patented Aug. 1, g

Erwin F. Loweke, Detroit, Mlcln, assignor to Bydraulic Brake Company, Detroit, Micln, a corporation or California Application May 29, 1943, Serial No. 489,042 Claims. (Cl. 103-150) This invention relates to fluid pump and more particularly to' the diaphragm structure and arrangement thereof. I

Heretofore fluid pumpswi the diaphragm type have not proved satisfactory for certain heavyduty uses, and it is the aim of this invention to provide an effective as well as economical diaphragm fluid pump.

The present invention is concerned primarily Y with the employment of a flexible diaphragm of rubber, or like material, as the pumping agent for a fluid pump, and of so utilizing the resilient and flowing qualities of rubber as to provide =ior a highlyv efflcient pumping. action. In so utilizing the normal characteristics of rubber, a diaphragm of sumcient bulk has been devised whereby energy is stored therein upon distortion or deflection thereof, operative to provide for the power stroke of the pump. With abuild up in pressure by the pump to a predetermined figure,

the diaphragm acts tofautomatically cut off the pump action inasmuch as the energy stored in the diaphragm would not be sufllcient to over come the pressure resistance.

An object of the invention is the provision of a fluid pump having a diaphragm wherein, upon suction stroke of the pump, an ample amount of energy is stored in the diaphragm due to the loaded distortion thereof to provide for a pumping stroke or the pump.

Other objects and advantages of the invention will appear from the following description taken in connection with the drawing forming part of this specification, and in which- Fig. 1 is a vertical sectional view of one embodiment of the nuiepump: a

Fig. 2 is a fragmentary view in section, illustrating the pump diaphragm in compressed position;

Fig. 3 is an enlarged sectional view of the outlet valve of the pump; and

Fig. 4 is an enlarged sectional view of the inlet valve of the pump.

Referring to the drawing for more specific details of the invention; Ill represents generally a fluid pump includinga irusto-conically shaped cylinder l2 adapted to be mounted in a fixed vertical position. The cylinder has an open end,

' and its other end is closed as by a valve body It a suction stroke of the pump, power is stored in v the diaphragm effective to' provide for a power stroke of the pump.

Another object of the invention is the provision of a fluid pump having a flexible diaphragm operative to efl'ect an automatic cut-off of the pump.

Another object of the invention is the provision of a fluid pump having a frusto-conically shaped diaphragm.

Another object of the invention is the provision of a fluid pump comprising a resilient diaphragm, a member for supporting the diaphragm at its base, anda suction-stroke power-driven plunger for the diaphragm having its'peripheral area bonded thereto, the diaphragm being actuated during the suction stroke of the pump and thereby storing energy to provide for the. power stroke or the pump.

A further object of the invention is the provision of a fluid pump having a diaphragm comagainst its seat by a spring 24, the whole comprising a heady and a base section, said base sec-1 tion having a hollow central portion providing for uniform annular cross-sectional area or the base soas to allow for greater flexibility or the diaphragm.

A further object of the invention is the provision of a fluid pump phragm of considerable bulk wherein, upon ahaving a, resilient diahaving ports l8 and ilcommunicating with one another by way of a chamber 20. A connection 22 threaded in thevalve body I4 has a passage 24 therethrough communicating with the chamber 20 controlled as by a valve 28 normally held prising the inlet valve assembly of the pump. A connection connected

passages

32 and 34 therethrough communicating by way or a chamber 36 with port cates with a fluid pressure accumulator or any suitable pressure actuated mechanism, not shown, to be actuated by the pump-created fluid pressure.

The cylinder 12 communicating with the valve body l4 by way of a port 42 includes a chamber 44 bounded by an interior conically shaped wall 46 of-the cylinder, the purpose of which will hereinafter appear.

A diaphragm 4! of rubber or other suitable resilient material, provided w th a i'msto-conically shaped exterior ll conforming to the wall 4 of the cylinder and having an annular skirt 8!, is

mounted on and bonded at I4 to a ring I, which 30, similarto connection 22,'is threaded in the valvefbody l4, and hasinter- 2 2,s54,9ss

in turn is bolted or otherwise suitably secured to the cylinder [2.

The diaphragm 48 is provided with a concentric passage 58 for the'reception of a. plunger 80 phragm.

In a normal operation, upon downward actuation of the plunger 60; viz: the suction strokes of the pump, fluid is drawn from the fluid supply source past the valve 26 through the chamber 20, passage l6,'and port 42, into chamber 44 ahead of the plunger and diaphragm. At the conclusion of the suction stroke, with the plunger and diaphragm in the position illustrated by Fig. 2, wherein the diaphragm has been placed under a compressive force, the pump diaphragm is prepared to begin its power stroke with the consequent creation of pressure ahead of the diaphragm and the expulsion of the fluid from chamber 55, through port 42, chamber 20, port l8, past valve 38, and through

passages

32 and 34 to the mechanism to be actuated thereby. The

diaphragm 48 is bonded at 54 to provide an effective seal and thereby prevent the seepage of fluid around the diaphragm.

Upon the attainment of a predetermined pressure on the fluid in the pump, the diaphragm automatically becomes inactive to cut out the pump until the pressure again falls below the predetermined amount, when once again the diaphragm fluctuates in accordance with theenergy stored therein. It will be observed from this that th pump operates variably, depending on the pressure stored and the set predetermined pressure.

It will be noted that the diaphragm comprises a sufllcient body of rubber or like material to absorb the necessary power during the suction stroke, during which it is confined externally by the encircling conical wall of the pump body, while it is free to flow inwardly, as necessary. The diaphragm when so deflected is in effect a reservoir of sufiicient power to operate the pump on its pumping stroke, thereby eliminating the usual return spring. The more the rubber of thediaphragm is compressed, the more effectively does it act as a seal.

While this invention has been described in connection with certain specific embodiments, the principle involved is susceptible of numerous other applications that will readily occur to persons skilled in the art. The invention is, therefore, to be limited only as indicated by the scope of the appended claims.

I claim:

1. In a fluid pump, a cylinder having a closed end and an open end, a frusto-conical diaphragm having its base supported in the open end of the cylinder, and means for actuating the diaphragm solely during a suction strok of the pump, the apex of the diaphragm being the pressure head of the pump.

2. In a fluid pump, a frusto-conical diaphragm adapted to be actuated during a suction stroke of the pump and operable under its own power to provide for the power stroke of the pump.

3. A fluid pump comprising a pump body having valves associated therewith, a pump element movable with respect to said body, and a dia-- phragm of considerable bulk and of rubber material sealing said element to said body and stressed by suction movement of said element, said diaphragm acting resiliently to operate said element on its pumping-stroke, said diaphragm having a generally conical exterior surface and said body being formed to embrace said surface and confine the diaphragm while it is stressed on the suction stroke.

4. A pump comprising a cylinder having a conical chamber, a flexible diaphragm seated therein and held against displacement, and a plunger therefor operative to place the diaphragm under compression.

5. A pump comprising a cylinder having a irusto-com'cal chamber, a flexible diaphragm seated therein and held against displacement, and a plunger supported by the diaphragm operative to intermittently place the diaphragm under compression.