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Publication numberUS3416461 A
Publication typeGrant
Publication dateDec 17, 1968
Filing dateSep 1, 1966
Priority dateSep 1, 1966
Publication numberUS 3416461 A, US 3416461A, US-A-3416461, US3416461 A, US3416461A
InventorsRolland Mcfarland
Original AssigneeHills Mccanna Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Diaphragm pump
US 3416461 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

Dec. 17, 1968 R. MCFARLAND 3,415461 DIAPHRAGM PUMP Fnd sept. 1, 1988 United States Patent Office Patented Dec. 17, 1968 3,416,461 DIAPHRAGM PUMP Rolland McFarland, Crystal Lake, Ill., assignor to Hills- McCanna Company, Carpentersville, Ill., a corporation of Illinois Filed Sept. 1, 1966, Ser. No. 576,704 4 Claims. (Cl. 103-150) ABSTRACT OF THE DISCLOSURE` There is disclosed a pump comprising a diaphragm having a central portion of progressively increasing thickness and an integral axially extending projection connected to an actuating member by a fitting extending over the projection and a transversely disposed pin.

The present invention relates to a novel pump structure, and more specifically to a novel diaphragm pump.

It has heretofore been proposed to provide a pump having a flexible diaphragm with means mechanically connected to the diaphragm for actuating the diaphragm in at least one direction during a pumping operation. For

example, it has been proposed to provide a diaphragm structure wherein the diaphragm is hydraulically actuated in one direction and mechanically pulled in an opposite or return direction. While certain of such heretofore proposed pumps have generally been satisfactory, diaphragm wear and leakage problems have been encountered.

An important object of the present invention is to provide a novel diaphragm pump structure wherein the diaphragm is mechanically actuated in at least one direction and wherein the diaphragm and a mechanical actuating element are constructed and connected in a manner which precludes any possibility of leakage and minimizes any possibility of diaphragm wear.

A further important object of the present invention is to provide a novel pump structure of the above described type which is of simple and economical construction which may be easily assembled.

Other objects and advantages of the present invention will be come apparent from the following description and the accompanying drawings wherein:

FIG. 1 is a partial sectional view showing a pump structure incorporating features of the present invention; and

FIG. 2 is a fragmentary partal sectional view taken generally along line 2-2 in FIG. 1.

Referring now more specifically to the drawings wherein like parts are designated by the same numerals throughout the various figures, a pump structure 10 incorporating features of the present invention comprises complementary body members 12 and 14 adapted to be detachably secured together by screws, bolts or other suitable fastening means. The body members 12 and 14 respectively present opposing annular seats 16 and 1-8. A flexible diaphragm 20 which is described more fully below is disposed with its annular margin clamped between the seats 16 and 18 and functions in combination with the body member 14 and defining a pumping chamber 22. The diaphragm also serves to separate the pumping chamber 22 from another chamber 24 in the body member 12 which accommodates hydraulic actuating fiuid as will be described below.

The body member 14 is formed with a fluid inlet 26 communicating with the pumping chamber 22 and connected through inlet passageway means 28 with an inlet conduit 30. In the embodiment shown, check valves 32 and 34 are connected in series in the passageway means 28 for preventing the reverse flow of fiuid through the passageway means. The check valves are secured in position by a suitable fitting 36.

The body means 14 is also formed with an outlet port 38 communicating with the pumping chamber 22 and with outlet passageway means 40. Additional check valves 42 and 44 are disposed in the outlet passageway means 40 for preventng reverse flow of fiuid. The check valves 42 and 44 are retained in position by a fitting 46 which is adapted to be connected with an outlet conduit 48.

The diaphragm 20 is adapted to be flexed back and forth within the chambers 22 and 24 during a pumping operation. As will be understood, movement of the diaphragm toward the left as viewed in FIG. 1 will force or pump fluid from the chamber 22 through the check valves 42 and 44 and into the outlet conduit 48.

Means are provided for hydraulically actuating the diaphragm 20 toward the left as viewed in FIG. 1 or, in other words, through its pumping stroke. As indicated above, the chamber 24, is provided for hydraulic actuating fiuid. The chamber 24 communicates with and includes a bore 50 and a reduced diameter bore 52 which are filled with hydraulic fiuid. A reservoir 54 for the hydraulic fiuid' is provided at the upper side of the body member 12 and is enclosed by a cover 56.

A valve unit 58 is disposed between the reservoir 54 and passageways 60 and 62 communicating with the chamber 24 and the bore 50. The valve unit 58 is adapted to permit hydraulic fiuid to flow from the reservoir so as completely to fill the spaces of the chamber 24, the bores 50 and 52 and the passageways 60 and 62. At the same time the valve unit 58 is constructed for permitting air to escape from these spaces whereby to insure that the spaces are completely filled with the liquid.

In order to actuate the hydraulic fiuid and thus the diaphragm 20 toward the left as viewed in FIG. 1, a mechanical piston or plunger 64 is reciprocably disposed in the bore 52. A pressure relief valve 65 is disposed between the bore 50 and the reservoir for permitting hydraulic fiuid to return to the reservoir in the event the pressure in the chamber 24 increases during the forward or working stroke of the piston to a level which may cause injury to the diaphragm. Any suitable means, not shown, may be connected with the piston 64 for reciprocating the piston. As will be understood, such piston actuating means may be made in accordance with any of a variety of heretofore known and used structures.

While the piston 64 serves to actuate the hydraulic fluid and the diaphragm toward the left, the valve unit is provided with spring means for actuating the diaphragm toward the right during the return stroke of piston 64 for minimizing any possibility of cavitation in the hydraulic actuating fiuid and for causing the diaphragm more positively to follow the reciprocating movement of the piston. In accordance with the features of the present invention the spring means is constructed and connected with the diaphragm in a manner so as to preclude leakage through the diaphragm and minimize any possibility of injury to the diaphragm while at the same time providing the desired efliciency in operation. More specifically, the spring means comprises a compression spring 66 disposed within the bore '50 and having one end seating against a fixed annular abutment 68 which in turn is supported by a snap ring 70 disposed in an annular groove or seat in the wall of the bore 50. A hollow tubular connecting rod or stem 72 is connected with the diaphragm in a manner described below and extends axially in the bore 50. The stem has an internal diameter similar to and communicates with the bore 52. Apertures 73 provide communication between the interior of the stem 72 and the bore 50. The stem 72 presents an annular fiange 74 at an end thereof opposite from the abutment 68 which flange is engaged by'the spring 66 so that the stem or connecting rod 72 is biased toward the right as viewed in FIG. l or, in other words, toward a diaphragm retracting position.

The diaphragm 20 comprises a 'body having relatively thin planar peripheral portion 76 which merges with a relatively thick central portion 78. The peripheral and central portions are integrally molded from a suitable tough resilient rubber, Synthetic rubber, plastic or other suitable material. The central and peripheral portions are preferably formed so that they provide a substantially coplanar surface facing the working or pumpiug cbarnber 22, which surface preferably covered with a laminated film or sheet material liner 80 of plastic, metal or other material inert to the fluid being pumped through the chamber 22, whereby to protect the main body of the diaphragm from the fiud.

As shown in the drawings, the relatively thick central portion 78 of the diaphragm merges with a projection 82 molded integrally therewith and from the same material as the remainder of the diphragm body, which projection extends axially rearwardly of the diaphragm or, in other words, axially into the bore 50. A transverse aperture 84 is provided through the projection 82 for accommodating a pin 86 which in turn extends through ears 88 and 90 of a fitting 92 assembled over the end of the projection 82. The fitting 92 is adapted to be connected with the stem 72.

In the embodiment shown, the fitting 92 and the stem 72 are formed with complementary threads 94 for detachably connecting the two parts together. With this constmction, it is seen that the connection between the diaphragm and the stem '72 is located entirely at one side of the main portions of the diaphragm whereby there is no possibility of leakage through the diaphragm. More precisely, the aperture which receives the pin 86 is at one side of and does not eXtend through the central portion 78 of the diaphragm. Furthermore, it will be observed that the projection 82 merges with the relatively thick portion 78 of diaphragm which gradually diminishes in thickness from adjacent the projection substantially to the peripheral portion 76, Whereby to accommodate the stresses imposed on the diaphragm by the spring means pulling on the projection 82 and to minimize any concentration of stresses during fiexing of the diaphragm and thereby promote a longer useful working life for the diaphragm. In certain instances, it is desirable to hold or otherwise secure a tubular liner 96 within the transverse aperture 84 for accommodating the connecting pin 86 and further minimizing any possibility Of injury to the diaphragm structure.

It will be noted that during assembly of the pump structure, the spring 66 and diaphragm stem 72 are dsposed within the bore 50 and secured in position by the abutment 68 and snap ring 70 prior to assembly with the diaphragm. Then the fitting 92 which has previously been connected to the diaphragm 20 is threaded into the end of the stem 72 and the peripheral portion 76 of the diaphragm is positioned against the seat 16. Prefera'bly the peripheral portion of the diaphragm is provided with annular ribs 100 which are adapted to fit within complementary grooves formed in the seat 16 for minimizing any possibility of leakage past the periphery of the diaphragm. Then the valve body member 14 is positioned against the diaphragm and the main body member 12 and is bolted or otherwise secured. If desired, additional annular ribs 102 may be provided on the diaphragrn for engaging in complementary grooves formed in the seat 18 or on the body member 14.

While a preferred embodiment of the present invention has been shown and described herein, it is obvious that many structural details may be changed without departing from the spirit and scope of the appended claims.

The invention is claimed as follows:

1. A pump comprising means including a fiexible resilient diaphragm providing a pumping chamber having an inlet and an outlet, valve means controlling fiow of fluid through said inlet and outlet, means for reciprocating said diaphragm for accomplishing a pumping action, said last named means including an element connected to said diaphragm for actuating the diaphragm in one direction, said diaphragm comprising a relatively thin flexible annular portion, an integral relatively thick central portion, an axially extending projection integral with said central portion, and means connecting said element to said projection, said means connecting said element to said projection comprises a fitting disposed over said projection, pin means extending in said projection and connected to said fitting, and complementary inter-engaging means on said fitting and said element detachably connecting said fittin g and said element.

2. A pump, as defined in claim 1, Wherein said projection has transverse aperture means therein, and said pin means extends into said aperture means.

3. A pump, as defined in claim 1 wherein said relatively thick central portion is of substantially greater radial extent than said axially extending projection and progressively decreases in thickness from adjacent a junction with said projection substantially to adjacent a junction with said relatively thin annular portion.

4. A pump, as defined in claim 1, wherein said complementary inter-engaging means comprise helical thread convolutions on said fitting and said element.

References Cited UNITED STATES PATENTS 1,711,803 5/1929 Munday 103 150 2,148,957 2/1939 Morris et al 103-150 2,267,280 12/1941 Kuhnel 230` 2,575,398 11/1951 Schroeder 103-150 2,675,758 4/1954 Hughes 103-150 3,075,468 11/1963 Eifel 103-44 WILLIAM L. FREEH, Primary Examiner.

U.S. Cl. X.R.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1711803 *Jan 4, 1927May 7, 1929Luther Munday ReginaldDiaphragm pump
US2148957 *Jun 28, 1937Feb 28, 1939Cooper Riggs ThomasDiaphragm pump
US2267280 *Oct 14, 1938Dec 23, 1941Hermes Patentverwertungs GmbhDevice for conveying fluids
US2575398 *Sep 26, 1949Nov 20, 1951John SchroederDiaphragm pump
US2675758 *Jan 6, 1949Apr 20, 1954Infilco IncChemical feeder
US3075468 *Apr 6, 1960Jan 29, 1963Hills Mccanna CoHydraulically actuated diaphragm pump
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3503307 *Mar 28, 1968Mar 31, 1970I V Pressure Controllers LtdDiaphragms
US3884598 *Oct 5, 1973May 20, 1975Wanner EngineeringPiston assembly for diaphragm pump
US4035107 *Sep 15, 1976Jul 12, 1977Durotech Co.Pump system for high pressure abrasive liquids
US4644847 *Jun 29, 1984Feb 24, 1987Fluitron, Inc.Reduction of failure incidence of metallic diaphragms for compressors
US4779641 *Sep 9, 1987Oct 25, 1988Penicillin Assays, Inc.Sanitary control back pressure diaphragm valve and sanitary control system employing said valve
US4785719 *Oct 24, 1983Nov 22, 1988J. Wagner GmbhDiaphragm for high pressure pumps, compressors or the like
US4860640 *Dec 3, 1986Aug 29, 1989Neway Corp.Air operated diaphragm spring brake
US4968301 *Feb 2, 1989Nov 6, 1990Imed CorporationDisposable infusion device
US5368570 *Nov 12, 1991Nov 29, 1994Imed CorporationApparatus for infusing medical solutions
US5507217 *Sep 30, 1994Apr 16, 1996Indian Head Industries, Inc.Perforate diaphragm alignment system for spring brake actuators
US5816779 *Mar 27, 1997Oct 6, 1998Abbott LaboratoriesDisposable fluid infusion pumping cassette having an interrelated flow control and pressure monitoring arrangement
US5848738 *Mar 28, 1997Dec 15, 1998Tetra Laval Holdings & Finance, S.A.Fill system including a fill pump disconnect system
US5863185 *Aug 30, 1995Jan 26, 1999Franklin Electric Co.Liquid pumping system with cooled control module
US6276907 *Aug 12, 1999Aug 21, 2001Wagner Spray Tech CorporationHydraulically driven diaphragm pump
US7090474 *May 16, 2003Aug 15, 2006Wanner Engineering, Inc.Diaphragm pump with overfill limiter
US7201097Jul 4, 2003Apr 10, 2007Weir Minerals Netherlands B.V.Diaphragm pump
US7329104 *Mar 2, 2004Feb 12, 2008Drummond Scientific CompanySplit-housing pipette pump
US7503910Feb 1, 2006Mar 17, 2009Carmeli AdahanSuctioning system, method and kit
US7758321 *Jul 15, 2005Jul 20, 2010Smc Kabushiki KaishaPump apparatus
US8235972Nov 8, 2006Aug 7, 2012Carmeli AdahanSuctioning system, method and kit
US8297939 *Jul 23, 2009Oct 30, 2012Fujifilm CorporationMethod of pumping agglomerative liquid and method of producing recording medium
US8317774May 6, 2008Nov 27, 2012Carmeli AdahanSuction system
US8506554Jul 24, 2005Aug 13, 2013Carmeli AdahanWound closure and drainage system
US8858534Jun 14, 2013Oct 14, 2014Carmeli AdahanWound closure and drainage system
US9050408 *Dec 20, 2010Jun 9, 2015Jean-Denis RochatReciprocating positive-displacement diaphragm pump for medical use
US9248222Oct 1, 2014Feb 2, 2016Carmeli AdahanWound closure and drainage system
US9377017Nov 15, 2013Jun 28, 2016Shenzhen Mindray Bio-Medical Electronics Co., Ltd.Extended elasticity of pump membrane with conserved pump force
US9638185Dec 22, 2014May 2, 2017Graco Minnesota Inc.Pulseless positive displacement pump and method of pulselessly displacing fluid
US9777721Dec 22, 2014Oct 3, 2017Graco Minnesota Inc.Hydraulic drive system for a pulseless positive displacement pump
US9777722Dec 29, 2015Oct 3, 2017Graco Minnesota Inc.Pulseless positive displacement pump and method of pulselessly displacing fluid
US9784265Dec 22, 2014Oct 10, 2017Graco Minnesota Inc.Electric drive system for a pulseless positive displacement pump
US20040228748 *May 16, 2003Nov 18, 2004Wanner Engineering, Inc.Diapharagm pump
US20050196303 *Mar 2, 2004Sep 8, 2005Drummond Scientific CompanySplit-housing pipette pump
US20060027606 *Jul 15, 2005Feb 9, 2006Smc Kabushiki KaishaPump apparatus
US20060110268 *Jul 4, 2003May 25, 2006De Koning Cornelis JDiaphragm pump
US20070179460 *Feb 1, 2006Aug 2, 2007Carmeli AdahanSuctioning system, method and kit
US20080299764 *Aug 7, 2008Dec 4, 2008Jun-Hwan OhInterconnection having dual-level or multi-level capping layer and method of forming the same
US20090157016 *Jul 24, 2006Jun 18, 2009Carmeli AdahanSuctioning system, method and kit
US20090198201 *Feb 6, 2009Aug 6, 2009Carmeli AdahanSuctioning system, method and kit
US20090264837 *Jul 24, 2005Oct 22, 2009Carmeli AdahanWound closure and drainage system
US20100021326 *Jul 23, 2009Jan 28, 2010Fujifilm CorporationMethod fo pumping agglomerative liquid and method of producing recording medium
US20100063483 *May 6, 2008Mar 11, 2010Carmeli AdahanSuction system
US20120312399 *Feb 16, 2011Dec 13, 2012Grundfos Management A/SDosing pump
US20120315157 *Dec 20, 2010Dec 13, 2012Jean-Denis RochatReciprocating Positive-Displacement Diaphragm Pump For Medical Use
CN104995407A *Nov 15, 2013Oct 21, 2015迈瑞医疗(瑞典)公司Extended elasticity of pump membrane with conserved pump force
DE10392934B4 *Jul 4, 2003Feb 5, 2015Weir Minerals Netherlands B.V.Membranpumpe
EP0223580A2 *Nov 17, 1986May 27, 1987Critikon, Inc.Parenteral solution diaphragm pump
EP0223580A3 *Nov 17, 1986Jan 13, 1988Critikon, Inc.Parenteral solution diaphragm pump
EP0751794B1 *May 10, 1995Jul 16, 2003Abbott LaboratoriesDisposable fluid infusion pumping chamber cassette having a push button flow stop thereon
EP2216057A2May 6, 2008Aug 11, 2010Carmeli AdahanSuction system
EP2733355A1 *Nov 15, 2013May 21, 2014Mindray Medical Sweden ABExtended elasticity of pump membrane with conserved pump force
EP3102828A4 *Dec 22, 2014Sep 20, 2017Graco Minnesota IncDrive system for a pulseless positive displacement pump
WO2004007961A1 *Jul 4, 2003Jan 22, 2004Weir Netherlands B.V.Diaphragm pump
WO2004104415A3 *May 13, 2004May 12, 2005Wanner EngineeringDiaphragm pump
WO2007088530A1 *Nov 8, 2006Aug 9, 2007Carmeli AdahanSuctioning system, method and kit
WO2014076239A1 *Nov 15, 2013May 22, 2014Mindray Medical Sweden AbExtended elasticity of pump membrane with conserved pump force
U.S. Classification417/568, 92/98.00R, 92/99, 417/388
International ClassificationF04B43/00, F04B43/067, F04B43/06
Cooperative ClassificationF04B43/0054, F04B43/067
European ClassificationF04B43/00D8, F04B43/067
Legal Events
Jul 20, 1981AS02Assignment of assignor's interest
Effective date: 19810710
Jul 20, 1981ASAssignment
Effective date: 19810710