Diaphragm pump

• US 4,375,346 A
• Filed: 03/18/1980
• Issued: 03/01/1983
• Est. Priority Date: 03/29/1979
• Status: Expired due to Term

• Current Assignee: A T Ramot Plastics Limited
• Original Assignee: A T Ramot Plastics Limited
• Inventors: Livni, Avinoam, Kraus, Menahem A., Frommer, Moshe A.
• Primary Examiner(s): Smith, Leonard E.
• Application Number:
  US06/131,370
• Time in Patent Office: 1,078 Days
• Field of Search: 417/199 A, 417/200, 417/205, 417/244, 417/383, 417/385, 417/386, 417/387, 417/388, 417/395, 417/474, 417/475, 417/476, 417/477, 417/571, 417/389
• US Class Current: 417/388
• CPC Class Codes: F04B 43/067 the fluid being actuated directly by a piston
• CPC Class Codes: F04B 43/14 having plate-like flexible members

Abstract

A diaphragm pump is described comprising a reciprocated diaphragm for expanding and contracting a chamber communicating with a passageway connecting the housing inlet and outlet for pumping a fluid therethrough, and a pair of check valves in the passageway permitting the fluid to flow only from the inlet to the outlet. The check valves are disposed along laterally-spaced parallel axes and provide a forward fluid flow through both valves in the same direction along the laterally-spaced parallel axes, the outlet of one check valve communicating with the inlet of the other via a folded section of the passageway having two 180° bends. Such an arrangement enables the diaphragm pump to be constructed in compact and/or miniaturized form.

According to another described feature, the diaphragm pump is constructed in combination with the peristaltic pump having an inlet for a liquid to be pumped, and an outlet connected to the inlet of the diaphragm pump. Both pumps are driven by a common drive shaft.

Claims

1. A diaphragm pump comprising a housing having an upper housing section and a lower housing section secured together at one of their ends;

and a diaphragm supported between the secured ends of the housing sections;

the upper housing sections including a rotatable drive shaft, a cam driven by said drive shaft, a cylinder, a piston reciprocated within said cylinder by said cam, and a cover disc closing the said secured end of said upper housing section;

said cover disc being formed with an inwardly-dished outer face facing the diaphragm, and with a bore establishing communication between said dished outer face and the outer end of said cylinder;

said lower housing section having an inlet for the fluid to be pumped, an outlet therefor, a fluid passageway connecting the inlet to the outlet, a pumping chamber communicating with said passageway which chamber is expanded and contracted by the reciprocation of said diaphragm effected by the reciprocation of said piston for pumping the fluid through said passageway, and a pair of check valves in said passageway permitting the fluid to flow only from the inlet to the outlet by the reciprocation of the diaphragm;

said check valves being disposed along laterally-spaced parallel axes and providing a forward fluid flow through both valves in the same direction along the laterally-spaced parallel axes, the outlet of one check valve communicating with the inlet of the other check valve via a folded section of the passageway having two 180°

bends;

said lower housing section including a further cover disc closing the said secured end of the lower housing section, which further cover disc is formed with an inwardly-dished outer face facing the diaphragm and defining therewith said pumping chamber;

said further cover disc being formed with a socket centrally of said inwardly-dished face and including a spring disposed within said socket urging the diaphragm in the return direction;

said further cover disc being further formed with a recess underlying said socket and constituting a portion of the folded section of said passageway at a location between said pair of check valves, and a bore leading from said socket to said recess and thereby establishing communication between said pumping chamber and said folded section of said passageway.

2. A pump according to claim 1, wherein said upper housing section further includes a reservoir for the hydraulic fluid, and a further check valve for replenishing the hydraulic chamber with the hydraulic fluid.

3. A pump according to claim 1, wherein said upper housing section further includes a hydraulic chamber within which said drive shaft and cam rotate and communicating with said cylinder and piston, and a bleeding valve communicating with the upper end of the hydraulic chamber for bleeding air therefrom.

4. A pump according to claim 1, wherein said lower housing section includes a bleeding valve communicating with the lower end of the folded section of the fluid passageway between the two check valves therein.