US3230889A - Venturi fluid pumps - Google Patents

Description

Jan. 25, 1966 R. D. BREWER VENTURI FLUID PUMPS 3 Sheets-Sheet 1 Filed June 29, 1964 FIG.].

RICHARD D. BREWER I N VEN TOR.

ATTORNEYS Jan. 25, 1966 D, BREWER 3,230,889

VENTURI FLUID PUMPS Filed June 29, 1964 5 Sheets-Sheet 2 F'IG.3

RICHARD D. BREWER INVENTOR.

AT TORNEVS Jan. 25, 1966 R. D. BREWER 3,230,889

VENTURI FLUID PUMPS Filed June 29, 1964 3 Sheets-Sheet 5 FIG.5

RICHARD D. BREWER INVENTOR.

BY 73 h A T TORNEVS United States Patent 3,230,889 VENTURI FLUID PUMPS Richard D. Brewer, Dear-born, Mich., assignor to Ford Motor Company, Dearborn, Mich, a corporation of Delaware Filed June 29, 1964, Ser. No. 378,628 11 Claims. (Cl. 103-53) This invention relates to venturi fluid pumps and more particularly to improvements in the venturi pump shown in my prior Patent No. 2,872,877, entitled Fuel Pump,

issued February 10, 1959.

A venturi pump employs the decreased static pressure generated by fluid flow through the throat of a venturi as a source of pressure differential for pumping fluids. Since the pressure diflerential is independent of the direction of flow, fluid may be pumped by causing a reversing fiow through the venturi. In my aforementioned patent, a reciprocating diaphragm is employed at one side of the venturi to cause alternating flow through its throat. A diaphragm also is positioned at the opposite end of the venturi to form a surge chamber.

The present invention contemplates increasing the capacity of a venturi pump by forming two separate driving chambers that communicate with opposite sides of the throat of the venturi. By decreasing the volume of one chamber simultaneously with an increase in volume of the other chamber, fluid may be driven through the throat. Reversing the change in the volumes of the chambers causes the fluid to flow in an opposite direction. The use of two separate chambers communicating with opposite sides of the throat permits a more positive flow reversal with a resulting increase in pump capacity.

It is, therefore, a principal object of this invention to provide a venturi pump having an increased flow capacity from that heretofore known.

Although the pump shown in my earlier patent could be modified to create a positive flow in both directions by positively actuating both of its diaphragms, the additional driving mechanism would be prohibitively costly.

It is a further object of this invention to provide a venturi fuel pump wherein a single actuating member controls the change in volume of fluid chambers communicating with the venturi on opposite sides of its throat.

A pump embodying this invention includes a venturi and a movable wall that defines first and second fluid chambers. Fluid communication is provided between the first chamber and the venturi on one side of its throat and between the second chamber and the venturi on the other side of its throat. A fluid inlet extends from a fluid source to the throat of the venturi. A fluid outlet extends from a position that is spaced from the throat of the venturi. Means are provided to move the wall in opposite directions to alternately compress the volumes of the first and second fluid chambers and drive fluid in opposite directions through the venturi throat. The fluid flow through the throat causes a pressure differential to be established between the fluid inlet and the fluid outlet.

In a first embodiment of this invention, the movable wall comprises a resilient diaphragm. The mean-s that provides communication between one of the fluid chambers and the venturi is a tubular member that is aflixed to the diaphragm and extends through it and the throat of the venturi. A small annular clearance is provided between external surface of the tubular member and the internal diameter of the throat.

The use of the flexible diaphragm in the aforementioned embodiment necessitates the provision of a seal around the periphery of the diaphragm. This seal is eliminated in other embodiments of the invention through the use of a cup-shaped member that defines opposing fluid chambers. The cup-shaped member has a wall that extends normal to the longitudinal axis of the venturi throat. A tubular portion surrounds the wall and extends axially through the throat of the venturi.

Further objects and advantages of this invention will become more apparent when considered in conjunction with the accompanying drawings, wherein:

FIGURE 1 is a cross-sectional view taken through the longitudinal axis of a venturi pump showing a first embodiment of this invention.

FIGURE 2 is an enlarged cross-sectional view of the circled area of the pump shown in FIGURE 1.

FIGURE 3 is a cross-sectional view taken through the longitudinal axis of a second embodiment of this inventio-n.

FIGURE 4 is a cross-sectional view, in part similar to FIGURE 3, showing a third embodiment of the invention.

FIGURE 5 is a top plan view of the return spring employed in the pump shown in FIGURE 4.

Referring now in detail to the embodiment shown in FIGURES 1 and 2 of the drawings, the pump comprises three cylindrical members, indicated by thereference numerals 11, 12 and 13. Thecylindrical member 13 forms thelower portion 14 of a venturi section. A matingupper portion 15 of the venturi section is formed within thecylindrical member 12. Theventuri portions 14 and 15 converge at a throat, indicated by thereference numeral 16.

Anannular cavity 17 is formed by corresponding recesses in the adjacent surfaces of themembers 12 and 13 around the periphery of thethroat 16. Thecavity 17 is positioned in fluid communcation with thethroat 16 by a plurality of radially extendingpassages 18. Thepassages 18 form a fluid inlet to thethroat 16 as will become more apparent as this description proceeds.

Afirst fluid chamber 19 is formed in part by a cylindrical recess in the upper surface of thecylindrical member 12. Thefirst fluid chamber 19 is in open communication with theupper portion 15 of the venturi section. Aresilient diaphragm 21 extends across the upper surface of thecylindrical member 12 to enclose thefirst fluid chamber 19. A plurality ofbolts 22 extend throughapertures 23 and 24 in thecylindrical members 13 and 12, respectively. Thebolts 22 are threaded into tappedholes 25 formed in the cylinder member 11. Agasket 26 is positioned between thecylinder members 12 and 13 to provide a fluid tight connection between them, and thediaphragm 21 forms a seal between thecylinder members 11 and 12.

Asecond fluid chamber 27, formed by a. cylindrical recess in the member 11, is enclosed by the upper surface of thediaphragm 21. Thesecond fluid chamber 27 is positioned in fluid communcation with thelower portion 14 of the venturi section by a tubular member, indicated generally by thereference numeral 28. Thetubular member 28 passes through a central aperture 29 in thediaphragm 21 along the axis of the venturi section. Ashoulder 31 formed on thetubular member 28 engages arigid disc 32 that bears against the lower surface of thediaphragm 21. A ferromagneticannular member 33 is threaded upon a threaded upper end 34- of thetubular member 28. Theferromagnetic member 33 engages arigid disc 35 that bears against the upper surface of thediaphragm 21 in opposition to thedisc 32. Thediaphragm 21 is compressed between thediscs 32 and 35 by threading theferromagnetic member 33 onto the tubular member 2.8.

Thetubular member 28 extends through theventuri throat 16 along its longitudinal axis and terminates within thelower portion 14 of the venturi section. A 1ongitudinal bore 36 that extends through thetubular member 28 provides fluid communication between thesecond fluid chamber 27 and thelower portion 14 of the venturi section. A slight annular clearance is provided between the outer diameter of thetubular member 28 and the inner diameter of the throat 16 (FIGURE 2).

Asolenoid coil 37 is supported within an extension of the cylindrical cavity that forms thesecond fluid chamber 27. Thecoil 37 is supported upon a ferromagnetic armature orcore 38 having a reduceddiameter portion 39 that extends through an aperture 41 formed in the upper wall of the member 11. Thecoil 37 is supported at its lower end upon ashoulder 42 of thearmature 38. Anut 43 is threaded ontothreads 44 formed on the reduceddiameter portion 39 to axially fix thecoil 37 andarmature 38 within the pump assembly. A suitable electric circuit (not shown) is provided to energize thecoil 37 and create a magnetic field through thearmature 38 that attracts theferromagnetic member 33 that is aflixed to thediaphragm 21.

Acoil spring 45 is positioned within thefirst fluid chamber 19 in engagement at one end with thecylindrical member 12 and at the other end with thedisc 32 to urge thediaphragm 21 toward thearmature 38. A stronger, returnspring 46 engages thecoil 37 and disc within thesecond fluid chamber 27 to return the dia phragm 21 to its normal position when thecoil 37 is not energized.

Afluid inlet passage 47 extends through thecylindrical member 13 to thecavity 17. Thepassage 47 may communicate with a source of fluid through a suitable conduit (not shown). Alternatively, the pump may be submerged within a source of fluid whereby thepassage 47 will form a direct fluid inlet. Afluid outlet passage 48 extends coaxially through thearmature 38 from thesecond fluid chamber 27. Anipple 49 formed upon the I upper end of thearmature 38 may be employed for connection to a fluid outlet conduit (not shown).

When thecoil 37 is energized, the magnetic field created through thearmature 38 will attract theferromagnetic member 33 and deflect thediaphragm 21 upwardly. This action decreases the volume within thefluid chamber 27 and increases the volume within thefluid chamber 19. Fluid is caused to flow from thesecond chamber 27 through the bore 36 in thetubular member 28 into thelower portion 14 of the venturi section. The fluid then flow-s through the clearance between thetubular member 28 and theventuri throat 16 to thefirst fluid chamber 19. The upward flow of fluid past thethroat 16 causesa static pressure decrease at thepassages 18 and draws fluid from theinlet passage 47 andcavity 17 into the venturi section. The increased fluid within the systern is discharged from theoutlet passage 48. When thecoil 37 is deenergized, thereturn spring 46 overcomes the action of the spring and thediaphragm 21 is deflected downwardly to reverse the fluid flow direction through theventuri throat 16. The flow in the reverse direction again causes a static pressure decrease at thethroat 16 to drive fluid through the pump.

Referring now to the embodiment shown in FIGURE 3, a pump is depicted that embodies two fluid chambers separated by a common wall as in the previously described embodiment. In this embodiment, however, a diaphragm is not employed with the resulting reduction in sealing problems.

The pump shown in FIGURE 3 comprises a lowercylindrical member 61 and an uppercylindrical member 62 secured together by a plurality ofbolts 63 with agasket 64 positioned therebetween. 61 forms alower portion 65 of a venturi section. A complementaryupper portion 66 of the venturi section is formed by thecylindrical member 62. The upper andlower venturi portions 66 and 65 converge at 'athroat 67.

The lower member Anannular cavity 68 formed within opposing faces of themembers 61 and 62 surrounds thethroat 67.Radial openings 69 extend from theannular cavity 63 into thethroat 67. Afluid inlet passage 71 extends through the lowercylindrical member 61 to theannular cavity 68. As in the previously described embodiment, theinlet passage 71 may communicate with a source of fluid in any suitable manner.

A cup-shaped member, indicated generally by thereference numeral 72, is supported for reciprocation within the venturi section. The cup-shapedmember 72 has a lower wall '73 that extends normally to the longitudinal axis of the venturi section within thelower venturi portion 65. A cylindrical portion '74 surrounds thelower wall 73 and is formed integrally therewith. Thecylindrical portion 74 extends coaxially with the longitudinal axis of the venturi section and its outer diameter is spaced radially inwardly of thethroat 67. A small annular clearance, therefore, exists between thethroat 67 and thecylindrical portion 74.

It should be readily apparent that the cup-shapedmember 72 divides the venturi section into two fluid chambers, indicated generally by thereference numerals 75 and 76. Thefirst fluid chamber 75 lies completely on the lower side of thethroat 67. A portion of thesecond fluid chamber 76 lies partially on the lower side of thethroat 67. Thesecond chamber 76, however, is in fluid communication with the venturi section only at the upper side of thethroat 67 because of the extent of thecylindrical portion 74.

A solenoid coil 77 encircles a ferromagnetic armature orcore 78 that extends along the axis of the venturi section. The lower end of the coil 77 is supported upon ashoulder 79 of thearmature 78. The upper end of the coil 77 engages aspacer 31 that encircles a threadedupper end 82 of thearmature 78. The threadedupper end 82 extends through anaperture 83 in the upper wall of thecylindrical member 62. An internally threaded,hollow cap member 84 engages thethreads 82 of thearmature 78 to axially position thearmature 78 and the coil 77 within the venturi section.

A supportingrod 85 reciprocates within abore 86 formed along the axis of thearmature 78. Therod 85 terminates at acap 87 that is supported within abore 88 of thecap member 84. A coil spring 8% engages thecap 87 and anadjustable stop 91 to urge therod 85 and cup-shapedmember 72 to which therod 85 is aflixed in a downward direction. A morerigid return spring 92 is positioned within the venturi section between thespacer 81 and wall 7 3.

When the coil 77 is energized by means of a suitable electric circuit (not shown), a magnetic field is created through thearmature 78. The cup-shapedmember 72 is formed of a ferromagnetic material so that the lower wall '73 will be attracted by the magnetic field. The magnetic attraction causes the cup-shapedmember 72 to be drawn upwardly and compress thesprings 8h and 92. The upward movement of the cup-shapedmember 72 compresses the volume in thesecond fluid chamber 76 and increases the volume in thefirst fluid chamber 75. A resulting fluid flow occurs through the venturi section in a downward direction through the clearance between thethroat 67 and thecylindrical portion 74. The flow through this clear ance creates a decreased static pressure at theopenings 69 to draw fluid into the venturi section from thefluid inlet passage 71. The fluid is discharged through anoutlet connection 93 positioned in the upper wall of thecylindrical member 62. When the coil 77 is deenergized, thesprings 89 and 92 will urge the cup-shapedmember 72 downwardly and reverse the direction of fluid flow through the clearance between thethroat 67 and thecylindrical portion 74. Although the fluid flow takes place in the opposite direction, pumping action will continue since a decreased pressure again is generated within the venturi throat.

The embodiment shown in FIGURES 4 and 5 is similar to that shown in FIGURE 3. In this embodiment, however, a different form of return spring for the reciprocating member is employed. Referring now to FIGURES 4 and 5, the pump comprises first and secondcylindrical members 111 and 112 forming upper andlower portions 113 and 114, respectively, of a venturi section. The venturi section is closed at each end bycylindrical end plates 115 and 116. Thecylindrical members 111 and 112 and theend plates 115 and 116 are held together to form a unitary assembly by the plurality of bolts 117 (only one of which is shown).Suitable gaskets 118 are positioned be tween the adjacent surfaces of each of the pump casing members.

Theventuri portions 113 and 114 converge at athroat 119 that is surrounded by an annular cavity 121 formed in opposing surfaces of thecylindrical members 111 and 112. The cavity 121 opens into thethroat 119 through a plurality of radially extendingopenings 122.Fluid inlet passages 123 and 124 formed in theend plate 116 andcylindrical member 112, respectively, connect the annular cavity 121 with a source of fluid, as in the previous embodiments.

A cup-shaped member, indicated generally by thereference numeral 125, is supported for reciprocation within the venturi section. The cup-shaped member comprises alower wall 126 that extends normally to the longitudinal axis of the venturi section. An integralcylindrical portion 127 surrounds thelower Wall 126 and extends coaxially with the venturi section through thethroat 119. A small annular clearance is provided between the outer surface of thecylindrical portion 127 and the inner surface of thethroat 119 for fluid flow therethrough.

The cup-shaped member divides the venturi section into two fluid chambers, indicated generally by thereference numerals 128 and 129. Thefirst chamber 128 lies completely on the lower side of thethroat 119. A portion of thesecond chamber 129 also lies below thethroat 119. Thechamber 123 is in fluid communication with the venturi section at the upper side of thethroat 119 because of the axial extent of thecylindrical portion 127.

Asolenoid coil 131 is supported coaxially Within the venturi section by a ferromagnetic armature or core 132. The lower edge of thecoil 131 is supported upon a shoulder 133 of the armature 132 and the upper end engages aspacer 134. A reduceddiameter portion 135 of the armature 132 extends throughapertures 136 and 137 in thespacer 134 andend plate 115, respectively. The upper end of theportion 135 is threaded, as at 138, for receipt of anut 139 that axially aflixes thecoil 131 and armature 132 in the pump assembly. Suitable electric circuit means (not shown) are provided to alternately energize thecoil 131.

A flat spiral leaf spring, indicated generally by thereference numeral 141 and shown in more detail in FIG- URE 5, is positioned within the lower end of the pump assembly to function as a return and centering spring for the cup-shapedmember 125. A threadedfastener 142 passes through an aperture in thelower wall 126 and acomplimentary aperture 143 formed in thespring 141. The outer ends of thespring 141 are secured to theend plate 116 byscrews 144.

When thecoil 131 is energized a magnetic field is created through the armature 132. The cup-shapedmember 125 is formed from a ferromagnetic material and the armature 132 draws the cup-shapedmember 125 upwardly. During the upward motion thespring 141 is deformed from its normal, fiat shape into a conical shape. As thecupshaped member 125 moves upwardly the volume of the secondfluid chamber 129 is decreased and the volume of thefirst chamber 128 is increased. This causes fluid to be driven downwardly through the clearance between thecylindrical portion 127 and thethroat 119. The flow through the clearance causes a decrease in static pressure so that fluid enters the venturi section. Fluid is therefore driven out of the venturi section through anoutlet conduit 145 positioned in thecover plate 115. When thecoil 131 is deenergized, thespring 141 returns to its flattened shape and causes fluid flow in the opposite direction between thethroat 119 and thecylindrical portion 127. A pressure dilferential is thereby generated again between the fluid inlet and fluid outlet and fluid flow takes place.

It is to be understood that the invention is not limited to the embodiments shown and described, but that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims.

I claim:

1. A pump comprising a venturi, a movable Wall defining first and second fluid chambers, means providing fluid communication between said first fluid chamber and said venturi on one side of its throat, means providing fluid communication between said second fluid chamber and said venturi on the other side of said throat, fluid inlet means extending from a fluid source to said venturi at said throat, fluid outlet means extending from said venturi at a point remote from said throat, and means for moving said wall in opposite directions to alternately compress the volumes of said first and said second fluid chambers to drive fluid in opposite directions through said throat for generating a pressure differential between said fluid inlet means and said fluid outlet means.

2. A pump comprising a venturi, first and second fluid chambers separated by a common movable wall, means comprising a tubular member extending through said venturi for providing fluid communication between said first fluid chamber and said venturi on one side of its throat, said tubular member being spaced radially inwardly of said throat to provide a clearance therebetween, said second fluid chamber being in fluid communication with said venturi on the other side of said throat, fluid inlet means extending from a fluid source to the throat of said venturi, fluid outlet means extending from said venturi at a point remote from said throat, and means for moving said wall in opposite directions to alternately compress the volumes of said first and said second fluid chambers to drive fluid in opposite directions through the clearance between said tubular member and said throat for generating a pressure differential between said fluid inlet means and said fluid outlet means.

3. A pump comprising a venturi, first and second fluid chambers separated by a common wall, said wall being supported for reciprocation, means including a tubular member extending through said venturi for providing fluid communication between said first fluid chamber and said venturi on one side of its throat, said tubular member being spaced radially inwardly from said throat to provide a clearance therebetween, said second fluid chamber being in open communication with said venturi on the other side of said throat, fluid inlet means extending from a fluid source to said venturi at its throat, fluid outlet means extending from said venturi at a point remote from said throat, means interconnecting said wall with one of said tubular member and said venturi for simultaneous reciprocation, and means for reciprocating said wall to alternately compress the volumes of said first and said second fluid chambers to drive fluid in opposite directions through said throat for generating a pressure differential between said fluid inlet means and said fluid outlet means.

4. A pump comprising a venturi, first and second fluid chambers separated by a common well, said wall being supported for reciprocation, means including a tubular member extending through said venturi for providing fluid communication between said first fluid chamber and said venturi on one side of its throat, said tubular member being spaced radially inwardly from said throat to provide a clearance therebetween, said second fluid chamber being in open communication with said venturi on the other side of said throat, fluid inlet means extending from a fluid source to said venturi at its throat, fluid outlet means extending from said venturi at a point remote from said throat, means interconnecting said wall with said tubular member for simultaneous reciprocation, and means for reciprocating said wall and said tubular member to alternately compress the volumes of said first and said second fluid chambers to drive fluid in opposite directions through the clearance between said tubular member and said throat for generating a pressure differential between said fluid inlet means and said fluid outlet means.

5. A pump comprising a venturi, first and second fluid chambers separated by a diaphragm, means including a tubular member extending throughsaid venturi for providing fluid communication between said first fluid chamber and said venturi on one side of its throat, said tubular member being spaced radially inwardly from said throat to provide a clearance therebetween, said second fluid chamber being in fluid communication with said venturi on the other side of said throat, fluid inlet means extending from a fluid source to said venturi at said throat, fluid outlet means extending from said venturi at a point remote from said throat and means for reciprocating said diaphragm to alternately compress the volumes of said first and said second fluid chambers to drive fluid in opposite directions through said throat for generating a pressure diflerential between said fluid inlet means and said fluid outlet means.

e. A pump comprising a casing having a cavity opening into a venturi, a diaphragm extending across said cavity and defining first and second fluid chambers, means providing fluid communication between the first of said fluid chambers and said venturi on one side of its throat, said second fluid chamber being in open communication with said venturi on the other side of said throat, fluid inlet means extending from a fluid source to said venturi at its throat, fluid outlet means extending from said venturi at a point remote from said throat, a ferromagnetic member affixed to said diaphragm, a coil positioned adjacent said ferromagnetic member, and means for alternately causing current flow through said coil for reciprocating said diaphragm to alternately compress the volumes of said first and said second fluid chambers and drive fluid in opposite directions through said throat for generating a pressure differential between said fluid inlet means and said fluid outlet means.

7. A fluid pump comprising a housing having a cavity opening into a venturi section, a diaphragm extending across said cavity and dividing said cavity into first and second fluid chambers, a tubular member aflixed to said diaphragm and extending therethrough, said tubular member further extending through the throat of said venturi for fluid communication between said first fluid chamber and said venturi on one side of said throat, said tubular member being spaced radially inwardly from said throat to provide a clearance therebetween, said second fluid chamber being in open communication with said venturi on the other side of said throat, fluid inlet means extending from a fluid source to said venturi at said throat, fluid outlet means extending from a point remote from said throat, and means for reciprocating said diaphragm to alternately compress the volumes of said first and said second fluid chambers to drive fluid in opposite directions through the clearance between said tubular member and said throat for generating a pressure diflerential between said fluid inlet means and said fluid outlet means.

8. A pump comprising a housing defining a venturi, a cup-shaped member having a wall extending normal to the longitudinal axis of said venturi and surrounded by a tubular portion that extends parallel to the longitudinal axis, said tubular portion extending axially through the throat of said venturi and being spaced radially inwardly therefrom to provide a clearance therebetween, fluid inlet means extending from a source of fluid to the throat of said venturi, fluid outlet means extending from said venturi at a point spaced from said throat, and means for reciprocating said cup-shaped member in opposite directions along the axis of said venturi for driving fluid in opposite directions through the clearance between said tubular portion and said throat for generating a pressure diflerential between said fluid inlet means and said fluid outlet means. v

9. A pump comprising a housing forming a venturi, a cup-shaped member supported within said venturi, said cup-shaped member having a wall extending normally to the longitudinal axis of said venturi on one side of its throat, said cup-shaped member further having a cylindrical portion surrounding said wall and extending parallel to said longitudinal axis and axially through said throat, said cylindrical portion being spaced radially inwardly from said throat to provide a clearance therebetween, a fluid inlet extending from a fluid source to the throat of said venturi, a fluid outlet extending from said venturi at a point spaced from said throat, at least a portion of the wall of said cup-shaped member being formed of a ferromagnetic material, a coil positioned in proximity to the ferromagnetic portion of said wall, biasing means urging said wall away from said coil, and means for causing an electrical current to flow alternately through said coil for reciprocating said cup-shaped member and driving fluid in opposite directions through the clearance between said throat and said cylindrical portion for generating a pressure differential between said fluid inlet and said fluid outlet.

10. A pump comprising a housing forming a venturi, a cup-shaped member supported within said venturi, said cup-shaped member comprising a wall portion extending normally to the longitudinal axis of said venturi on one side of its throat, said cup-shaped member further having a cylindrical portion surrounding said wall portion and extending parallel to said longitudinal axis and through said throat, said cylindrical portion being spaced radially inwardly from said throat to provide a clearance therebetween, fluid inlet means extending from a fluid source to said throat, fluid outlet means extending from said venturi at a point spaced from said throat, at least the central part of said wall portion being formed of a ferromagnetic material, a ferromagnetic core extending along the longitudinal axis of said venturi and terminating adjacent said central part, a guide member aflixed to said wall portion and supported for reciprocation by said core, biasing means urging said guide member and said cup-shaped member away from said core, a coil encircling said core, and means for causing an electrical current flow through said core for reciprocating said cupshaped member to drive fluid in opposite directions through the clearance between said cylindrical portion and said throat for generating a pressure differential between said fluid inlet means and said fluid outlet means.

11. A pump comprising a housing forming a venturi, a cup-shaped member supported within said venturi, said cup-shaped member comprising a wall portion extending normally to the longitudinal axis of said venturi on one side of its throat, said cup-shaped member further having a cylindrical portion surrounding said wall portion and extending parallel to said longitudinal axis and through said throat, said cylindrical portion being spaced radially inwardly from said throat to provide a clearance therebetween, fluid inlet means extending from a fluid source to said throat, fluid outlet means extending from said venturi at a point spaced from said throat, at least the central part of said wall portion being formed of a ferromagnetic material, a ferromagnetic core extending along the longitudinal axis of said venturi and terminating adjacent said central part, a guide member aflixed to said wall and supported for reciprocation by said core, a spiral shaped leaf spring aflixed at one end to said central part 9 10 and at another end to said housing, a coil encircling said References Cited by the Examiner core, and means for causing an electrical current flow UNITED STATES PATENTS through said core for reciprocating said cup-shaped membar to drive fluid in opposite directions through the clearance between said cylindrical portion and said throat 5 2,461,611 2/1949 Lott for generating a pressure differential between said fluid inlet means and said fluid outlet means. ROBERT WALKER Prlmary Examl'wr- 2,312,712 3/1943 Hartline 230-95 X 222-193

Claims (1)

1. 6. A PUMP COMPRISING A CASING HAVING A CAVITY OPENING INTO A VENTURI, A DIAPHRAGM EXTENDING ACROSS SAID CAVITY AND DEFINING FIRST AND SECOND FLUID CHAMBERS, MEANS PROVIDING FLUID COMMUNICATION BETWEEN THE FIRST OF SAID FLUID CHAMBERS AND SAID VENTURI ON ONE SIDE OF ITS THROAT, SAID SECOND FLUID CHAMBER BEING IN OPEN COMMUNICATION WITH SAID VENTURI ON THE OTHER SIDE OF SAID THROAT, FLUID INLET MEANS EXTENDING FROM A FLUID SOURCE TO SAID VENTURI AT ITS THROAT, FLUID OUTLET MEANS EXTENDING FROM SAID VENTURI AT A POINT REMOTE FROM SAID THROAT, A FERROMAGNETIC MEMBER AFFIXED TO SAID DIAPHRAGM, A COIL POSITIONED ADJACENT SAID FERROMAGNETIC MEMBER, AND MEANS FOR ALTERNATELY CAUSING CURRENT FLOW THROUGH SAID

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