US3392674A - Pump with piston and diaphragm - Google Patents

Pump with piston and diaphragm Download PDF

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Publication number
US3392674A
US3392674A US590429A US59042966A US3392674A US 3392674 A US3392674 A US 3392674A US 590429 A US590429 A US 590429A US 59042966 A US59042966 A US 59042966A US 3392674 A US3392674 A US 3392674A
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fluid
diaphragm
piston
compartment
pump
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US590429A
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English (en)
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Paul W Schlosser
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Individual
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Individual
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Priority to US590429A priority Critical patent/US3392674A/en
Priority to DE19671728490 priority patent/DE1728490A1/de
Priority to DE19671653624 priority patent/DE1653624A1/de
Priority to GB45100/67A priority patent/GB1208003A/en
Priority to GB50607/69A priority patent/GB1208004A/en
Priority to CH1612268A priority patent/CH500380A/de
Priority to CH1509667A priority patent/CH485121A/de
Priority to JP42069039A priority patent/JPS504882B1/ja
Application granted granted Critical
Publication of US3392674A publication Critical patent/US3392674A/en
Anticipated expiration legal-status Critical
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/12—Valves; Arrangement of valves arranged in or on pistons
    • F04B53/123—Flexible valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
    • F04B43/06—Pumps having fluid drive
    • F04B43/067—Pumps having fluid drive the fluid being actuated directly by a piston
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/1002—Ball valves
    • F04B53/101—Ball valves having means for limiting the opening height
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • F04B53/162—Adaptations of cylinders
    • F04B53/164—Stoffing boxes

Definitions

  • the present invention relates to a pump having a piston actuating a driving fluid actuating a flexible diaphragm pumping a driven fluid.
  • the diaphragm is part of a separator assembly which seals 21 compartment containing the driving fluid from a compartment containing the driven fluid; and the separator assembly includes means for increasing the effectiveness of the seal in response to a pressure stroke by the piston when the latter actuates the driving fluid.
  • the piston reciprocates inwardly and outwardly within a cylinder; and the piston and cylinder each include sealing means cooperating to permit expulsion of fluid from behindthe piston to the front of the piston, during outward movement of the piston, and for impeding entry of fluid from the front of the piston to the rear thereof, during inward movement of the piston, while maintaining a pressure less than atmospheric within the cylinder to the rear of the piston.
  • the separator assembly also includes means which minimize wear on the diaphragm and extends the life thereof.
  • FIGURE 1 is a side elevational view, partially in section, illustrating an embodiment of a pump constructed in accordance with the present invention
  • FIGURE 2 is an enlarged exploded perspective view, partially cut away, of an embodiment of a separate assembly forming part of the pump of FIGURE 1;
  • FIGURE 3 is a plan view, partially in section and partially cut away, of the pump of FIGURE 1;
  • FIGURE 4 is an enlarged fragmentary view, partially in section and partially cut away, of an embodiment of a piston assembly forming part of the pump of FIGURE 1.
  • the embodiment of the pump illustrated therein includes first and second housing portions indicated generally at 11, 12, respectively, and secured together by bolts 22 (FIG. 3).
  • Each housing portion 11, 12 has a first or inner open end in mutually facing disposition, and a second or outer open end opposite the first open end. Closing the outer open end of second housing portion 12 is an end member indicated generally at 13 and secured to housing portion 12 by bolts 23 (FIG. 3).
  • first housing portion 11 Located at the outer open end of first housing portion 11 is a hollow cylinder indicated generally at 14 and at- 3,392,674 Patented July 16, 1968 tachcd to housing portion 11 by bolts 24 (FIG. 3). Disposed between housing portions 11 and 12, at the mutually facing inner open ends thereof, is a separator assembly indicated generally at 16. Separator assembly 16 is free floating in the sense that it is not secured by fasteners to either of the housing portions 11, 12, but is clamped therebetween. Located within cylinder 14 is a piston assembly indicated generally at 15.
  • First housing portion 11, separator assembly 16, cylinder 14 and piston assembly 15 define a driving fluid chamber 17.
  • Second housing portion 12, separator assembly 16 and end member 13 define a driven fluid chamber 18.
  • piston assembly 15 reciprocates in inward and outward directions within cylinder 14 (to the left and to the right, respectively, as viewed in FIGURE 1).
  • driving fluid within chamber 17 is urged against separator assembly 16 causing a flexible, fluid-impermeable diaphragm 19, constituting part of separator assembly 16, to flex tothe left, as viewed in FIGURE 1.
  • piston assembly 15 moves outwardly, the pressure within driving fluid chamber 17 is decreased, and flexible diaphragm 19 is urged to the right, as viewed in FIGURE 1.
  • driven fluid chamber 18 The components which define driven fluid chamber 18 will now be described in more detail.
  • End member 13 includes an outer portion 28 which bears against an O-ring seal 29 received within a circular indentation 30 located around the outer open end of housing portion 12.
  • End member 13 also includes an inner portion 31 extending within housing portion 12 and including an inner recess 32 holding a valve seat 34 composed of a hard, Wear-resistant material, such as tungsten carbide, and constituting part of the inlet valve.
  • the inlet valve also includes a ball 35 normally maintained in a seated position, closing inlet conduit 20, by a retainer indicated generally at 36.
  • Retainer 36 is constructed of a springy material and includes an inclined portion 37 and an upright portion 38 extending upwardly from inclined portion 37. Inclined portion 37 normally urges ball 35 in a downward direction to maintain the ball in a seated position against seat 34, thereby closing inlet conduit 20.
  • Valve assembly 41 includes an upper portion 50 from which depends an externally threaded, cylindrical portion 42 threadedly engaged within a threaded opening 43 communicating with outlet channel 21 in housing portion 12. The innermost end of cylindrical portion 42 presses against a gasket 44 resting atop a shoulder 33 at the innermost end of threaded opening 43 in housing portion 12. Located atop gasket 44 is an annular valve seat 45 held in place by an interior shoulder 65 on valve housing portion 42. A ball 46 normally rests on seat 45.
  • ball 46 When fluid is expelled from compartment 18, ball 46 is raised upwardly by the expelled fluid to permit the fluid to flow therearound and upwardly through the interior of housing portion 42. Upward movement of ball 46 is limited by a retainer 47 held in place by the lower end of a spring 48, the upper end of which engages an interior shoulder 49 in valve upper portion 50.
  • Gasket 44- is composed of conventional compressible gasket material and provides a seal to prevent leakage of driven fluid around the exterior of cylindrical portion 42. Gasket 44 also help deaden the sound of ball 46 striking against seat 45, when ball 46 returns to a position closing outlet conduit 21; and this occurs when diaphragm 19 stops flexing to the left.
  • Valve upper portion 50 has four internally threaded channels therein, each channel space 90 apart. In the illustrated embodiment, two of these channels are closed by externally threaded plugs 51, 52; and these channels normally perform no function, but are available for connection of externally threaded outlets such as 53, shown received in one of the other threaded channels in valve portion 50.
  • the fourth channel on valve portion 50 receives an air relief valve for driven fluid compartment 18.
  • This valve is indicated generally at 55 in FIGURE 3 and includes a housing 56 having an elongated, hollow, cylindrical portion 57 terminating at an inner open end normally closed by a ball 58 attached to one end of a rod 59 having another end extending outwardly from housing 56 and terminating at a button 60 normally urged in an outward direction by one end of a spring 61, the other end of which seats against an annular member 62 located in a recess at the outermost portion of housing 56.
  • Housing 56 also includes a port 63 communicating with a conduit 64 through which air is expelled in a manned now to be described.
  • Gasket 44 is sufliciently compressible to permit threaded cylindrical portion 42 of valve assembly 41 to be turned through an angle suflicient to permit adjustment of driven outlet 53 or of air relief valve 55 to a particular angular orientation.
  • each housing portion 11, 12 has a recess or shoulder 26, 27, respectively, for clamping therebetween the outer peripheral portion 82 of the main body element 70 (FIG. 2) of separator assembly 16.
  • Second housing portion 12 also includes another recess 25 located concentrically within outer shoulder 27. Recess 25 provides a clearance for flexing of diaphragm 19 during operation of the pump.
  • main body element 70 also includes opposed first and second surfaces 66, 67 facing toward driving and driven fluid compartments 17, 18, respectively.
  • Second surface 67 of element 70 includes a tapered portion 68 extending inwardly from peripheral portion 82 to a recess 69.
  • Extending through main body element 70 are a plurality of fluid passages 71 arranged around a central opening 72 in which is slidably received a plug 73 having a threaded interior for engagement by a bolt 74 upon which are mounted a number of elements.
  • a disk 76 Sandwiched between an adjacent end of plug 73 and a nut 77.
  • a relatively rigid metal washer Mounted on bolt 74, next to the ned of plug 73 adjacent driven fluid compartment 18, and adjacent second surface 67 of main body element 70, is a relatively rigid metal washer and mounted next to metal washer 80 is flexible diaphragm 19.
  • Mounted adjacent the surface of diaphragm 19 facing the interior of driven fluid compartment 18 is a relatively hard, rigid second metal washer 78 and sandwiched between the latter and diaphragm 19 is a relatively soft, pliable plastic washer 79.
  • First metal washer 80, diaphragm 19, plastic washer 79 and second metal washer 78 are all held in place between a head 81 of bolt 74 and the adjacent end of plug 73.
  • the washers 78, 80 provide rigidity to the central portion of diaphragm 19, and are of a substantially smaller diameter than the diaphragm to permit flexibility of intermediate portions of the diaphragm.
  • the outermost peripheral portion 182 of diaphragm 19 is clamped between shoulder 27 of second housing portion 12 and outer peripheral portion 82 of main body element 70.
  • First metal washer 80 has a diameter corresponding to the diameter of recess 69 in main body element 70 of separator assembly 16.
  • second metal washer 78 has a diameter slightly smaller than that of the first metal washer
  • plastic washer 79 has a diameter slightly smaller than the second metal washer.
  • recess 69 and first metal washer 80 would have a diameter of about one and three-quarter inches
  • second metal washer 78 would have a diameter of about one and one-half inches
  • plastic washer 79 would have a diameter of about one and three-eighths inches
  • the flexible diaphragm 19 would have an unclamped diameter of about two and one-quarter inches.
  • Second O-ring 84 forms a seal between outer peripheral portion 82 of main body element 70 and shoulder 26 on first housing portion 11. This prevents leakage of driving fluid from driving fluid compartment 17 outwardly between main body element 70 and first housing portion 11.
  • the effective area, on first surface 66 of main body element 70, against which driving fluid pressure is exerted, is an area having a diameter corresponding to the inner diameter of outer O-ring 84. This is greater than the effective area against which driving fluid pressure is exerted on second surface 67 of main body element 70, the latter area having a diameter defined by the outer diameter of tapered portion 68 on main body element 70.
  • first surface 66 is greater than the effective area on second surface 67, there will be a greater fluid force exerted against surface 66 than against surface 67 of main body element 70 when the piston assembly 15 is moving inwardly.
  • main body element 90 will be urged toward driven fluid compartment 18 (to the left, as viewed in FIGURE 1), and clamped diaphragm peripheral portion 182 will be further compressed between the flat surface of shoulder 27 on second housing portion 12 and the opposed flat surface on outer peripheral portion 82 of main body element 70.
  • the area of disk 76 is approximately the same as the area of the unclamped part of diaphragm 19 and is substantially larger than the area of piston assembly 15 which acts on the driving fluid, the latter area corresponding to that of the interior cross section of cylinder 14. As a result of these area relationships, it is easier to break the seal between disk 76 and O-ring 83 upon commencement of a suction stroke of piston assembly 15 (outward movement, to the right, as viewed in FIGURE 1) than would be the case if the disk were smaller in area.
  • First metal washer 80 serves as a back-stop divider between compartments 17 and 18 in case diaphragm 19 is punctured or wears out. In such a situation, washer 80 would engage recess 69 and prevent driven fluid in compartment 18 from flowing through fluid passages 71 into driving fluid chamber 17, during outward movement of piston assembly 15.
  • Relatively soft plastic washer 79 maintains hard, rigid second metal washer 78 spaced away from diaphragm 19 and out of contact with the diaphragm in all positions of flexing movement of the diaphragm. Soft washer 79 also prevents metal washer 78 from pressing abrasive particles against the adjoining surface of diaphragm 19. Plastic washer 79, being relatively soft, does not press abrasive particles into diaphragms 19 as would hard metal washer 78 if it were in contact with the diaphragm. Thus, plastic washer 79 prevents diaphragm 19 from being damaged and increases the life thereof.
  • cylinder 14 has opposed inner and outer Open ends 172, 173 and includes a pehipheral portion which bears against an O-ring 91 mounted in a circular indentation at the outer open end of first housing portion 11.
  • O-ring 91 is held between first housing portion 11 and.
  • cylinder 14 and defines a seal to prevent the leakage of fluid from within driving fluid compartment 17 outwardly between first housing portion 11 and cylinder 14.
  • the cylinder has an inner surface 181 which is hardened to resist wear and abrasion from components of the piston assembly.
  • piston assembly 15 typically is rigidly attached, by a bolt 101, to an inner end portion 102 of a connecting rod 94 having an outer end terminating at a bearing 95 mounted around an offset portion 96 of a crank shaft 97 powered by conventional motive means such as an electric motor (not shown).
  • piston assembly 15 comprises an internally threaded cylindrical member 100 threadedly engaged around bolt 101 and spaced from inner end portion 102 of connecting rod 94 by a backing washer 103 and a pair of spacing washers 104, 105, all loosely mounted on bolt 101.
  • a retainer plate 108 Secured to the inner face 170 of member 100, by the head 170 of bolt 101, is a retainer plate 108 having a larger diameter than member 100.
  • annular, elastically deformable cup seal 106 composed of rubber, or the like, and having an outer circular flange 113, an inner circular flange 114 and a Web 115 between the two flanges.
  • Retainer plate 108 has a diameter larger than that of cup seal inner flange 114 and helps hold cup seal 106 in the desired position around member 100.
  • Boot 110 is in the form of a tapered tubular member turned inside out, and has an inner edge portion 112 sealiugly fixed around inner end portion 102 of connecting rod 104 and an outer edge portion 111 sealingly fixed around cylinder 14 adjacent its outer open end 173. Boot 110 prevents air outside the pump from entering cylinder 14.
  • outer flange 113 of cup seal 106 ' will be urged, by the larger pressure to the left thereof, rearwardly and radially outwardly against the walls of cylinder 14, thus effecting a seal to prevent driving fluid in compartment 17 from passing around the piston assembly into the space between the latter and boot 110.
  • Boot 110 and cup seal 113 also cooperate to expel, back into driving fluid chamber 17, whatever fluid has leaked past the cup seal into the space behind piston assembly 15 between it and boot 110. More specifically, 'when piston assembly 15 again moves outwardly (to the right, as viewed in FIGURE 4), the decreasing pressure in driving fluid chamber 17 will be less than the increasing pressure in the space between piston assembly 15 and boot 110, thereby causing expulsion of driving fluid from said space back into driving fluid chamber 17. The fluid is expelled around the outer flange 113 of cup seal 106.
  • Annular follower seal 107 has an inner diameter greater than the outer diameter of member 100.
  • the increasing pressure in driving fluid chamber 17 causes elastically deformable U-cup 106 to deform as follows: the inner part of web 115 and inner flange 114 are extruded into an annular space 174 between annular follower 107 and member 100; and outer flange 113 is forced radially outwardly and to the right so as to wipe against the wall of cylinder 14 and form a seal.
  • elastic follower seal 107 is compressed between the relatively rigid web 115 of cup seal 106 (itself, forced rearwardly) and the rigid metal backing washer 103 located behind follower seal 107. Backing washing 103, being fixed behind follower seal 107, restricts rearward movement thereof. As the compressive pressure on the 'follo'wer seal increases, it extrudes radially inwardly into annular space 174 and radially outwardly against the wall of cylinder 14 to provide a further seal against leakage of driving fluid from compartment 17 around the outside of piston assembly 15.
  • Piston assembly 15 is illustrated in a some-what exaggerated rocked condition, in FIGURE 4.
  • the piston assembly will rock as a result of the rigid connection thereof to the inner end portion 102 of connecting rod 94; but the sealing action described in the preceding paragraph occurs even though piston assembly 15 rocks during an inward stroke; and special structure to minimize rocking is not needed.
  • Boot 110 is essential to obtain the above-described sealing effect. Without a seal such as boot 110, air from outside the pump could enter cylinder 14 behind (to the right of) piston assembly 15 and prevent the formation of a partial vacuum in cylinder 14 behind the piston assembly. Without this partial vacuum, the cup seal flanges and the elastic follower seal would not be deformed in the manner described. With boot 110, the pressure behind the piston assembly is always less than atmospheric.
  • the piston assembly be constructed so as to provide an annular space 174 into which the cup seals inner flange 114 and the follower seal 107 can extrude. Without such an annular space to accommodate extrusion, the cup seals outer flange 113 would be extruded between the walls of cylinder 14 and the backing Washer 103 and would be worn away or damaged.
  • the pump also includes structure to permit driving fluid to be introduced into driving fluid chamber 17 and structure to permit driving fluid to be expelled from the driving fluid chamber.
  • FIGURES l and 3 there is illustrated a reservoir at for containing the driving fluid.
  • a line 121 Connected to reservoir 120 is a line 121 having an end 175 (FIG. 3) communicating with the hollow interior 176 of an externally threaded inlet valve having a body 122 threadedly engaged to pump housing portion 11.
  • Interior 176 may be closed to the entry of driving fluid by a ball 123 when the latter is seated, as shown in FIGURE 3.
  • Ball 123 On a suction stroke of piston assembly 15 (movement to the right, as viewed in FIGURE 1), ball 123 is urged to the left, as viewed in FIGURE 3, and unseated, thus opening the valves hollow interior 176 for the entry of liquid from line 121.
  • Driving fluid passes from valve interior 176 to compartment 17 via an opening 124 (FIG. 1) extending through pump housing portion 11 and cylinder 14 and communicating with the inlet valve.
  • Ball 123 has a slightly smaller diameter than interior 176 to provide a slight clearance between ball 123 and the walls of interior 176 when the ball is unseated.
  • the size of this clearance being relatively small, permits the introduction of only a relatively small volume of driving fluid on a suction stroke of piston assembly 15, compared to the volume displaced by movement of the piston assembly to the right.
  • the difference between the displaced volume and the volume of driving fluid entering through the inlet valve is made up by the movement of diaphragm 19.
  • the smaller the volume of fluid entering through the inlet valve the greater the movement of diaphragm 19.
  • driving fluid is expelled from driving fluid compartment 17 through a passage in pump housing portion 11.
  • Passage 130 communicates with the hollow interior of a hollow bolt 131 which secures a valve assembly, indicated generally at 132, to pump housing portion 11.
  • Valve assembly 132 includes a housing 129 which rests on a spacer 133 in turn resting on pump housing portion 11. Seal 134, between pump housing portion 11 and spacer 133, seal 135, between valve housing 129 and spacer 133, and seal 136, between valve housing 129 and the head 124 of bolt 131, are provided for the usual leakage-preventing purpose.
  • hollow bolt 131 includes a radially extending port 137 communicating with externally threaded tubular valve seat 138 threadedly engaged within valve housing 129.
  • a ball 139 normally closes seat 138 and is surrounded by a tubular retainer 140' and held in place by one end of a retaining rod 141 extending longitudinally through a hollow interior portion of valve housing 129 and through an externally threaded hollow member 142 threadedly engaged within housing 129.
  • Rod 141 is urged against ball 139 to hold the ball in a closed position on seat 138 by a spring 143.
  • the pressure which spring 143 exerts against ball 139 may be adjusted by unscrewing an internally threaded cap 150 threadedly engaged to an outer end portion 180 of hollow member 142, and turning member 142, the pressure on spring 143 being increased or decreased depending upon the direction in which member 142 is turned.
  • a seal 151, between rod 141 and hollow member 142, and a seal 152, between cap 150 and hollow member 142, are provided for the usual leak-preventing purpose.
  • Structure is also provided to bleed air from driving fluid compartment 17, in situations wherein air may be present therein, such situations being, for example, when the pump is brand new or when it has been recently repaired.
  • hollow bolt 131 includes a second port 160 communicating with the hollow interior of an externally threaded fitting 161 threadedly engaged to housing 129 and having a valve seat 162 closed by a ball 163 held in place by one end of a bolt 164 having another end attached to a knob 165.
  • Fitting 161 also includes a port 166 communicating with a transparent line 167.
  • knob 165 When knob 165 is loosened sufliciently, ball 163 will be displaced'from its seat on an inward movement of piston assembly 15, and will return to its seat upon an outward movement of piston assembly 15. The net result is to eX- pel fluid through fitting 161 into line 167.
  • means including a first housing portion, defining a driving fluid compartment
  • hollow cylinder means communicating with said driving fluid compartment
  • piston means mounted for reciprocal movement inwardly and outwardly within said cylinder means; separator means separating said compartments;
  • said separator means comprising means, including a flexible fluid-impermeable diaphragm, for sealing each of said fluid compartments from the other;
  • said diaphragm having an outer peripheral portion located between said first and second housing portions and clamped solely between opposed flat surfaces to form said seal;
  • said means defining each of the fluid compartments and said separator means including means cooperable for increasing and decreasing the clamping pressure of the opposed flat surfaces on the outer peripheral portion of said diaphragm cyclically in response to in ward and outward movement of the piston means to increase the effectiveness of said sealing means.
  • a pump means, including a first housing portion, defining a driving fluid compartment; means, including a second housing portion, defining a driven fluid compartment; hollow cylinder means communicating with said driving fluid compartment; piston means mounted for reciprocal movement inwardly and outwardly within said cylinder means; separator means separating said compartments; said separator means comprising means, including a flexible fluid-impermeable diaphragm, for sealing each of said fluid compartments from the other; said separator means comprising a free-floating main body element having a first surface, facing toward said driving fluid compartment, and a second surface, opposite said first surface, facing toward said driven fluid compartment; said main body element including an outer peripheral portion; said flexible diaphragm being located between the main body element and said driven fluid.
  • said flexible diaphragm is composed of material which will cold extrude; and said outer peripheral portion of the flexible diaphragm is clamped solely between opposed flat surfaces on the outer peripheral portion of the main body element and on the second housing portion to form said seal.
  • said main body element having at least one fluid passage extending therethrough from the first to the second surface; said fluid passage comprising means for communicating with said driving fluid compartment; said flexible diaphragm and the second surface of the main body element defining a space communicating with the fluid passage in the main body element; the outer peripheral portion of said main body element being clamped between the first and second housing portions for movement relative to the outer peripheral portion of the flexible diaphragm in response to changes of driven fluid pressure; the first surface of the main body element having a greater area exposed to the pressure of the driving fluid than does said second surface of the main body element.
  • hollow cylinder means having an inner open end and an outer open end; means communicating with said inner open end of the cylinder means and cooperating therewith to define a fluid enclosure; piston means mounted for reciprocal movement inwardly and outwardly within said cylinder means; said piston means having a front facing the inner open end of the cylinder means and a rear located behind said front;
  • sealing means on the piston means and on said cylinder means for permitting expulsion of fluid from behind said piston means to the front of the piston means during Outward movement of the piston means and for impeding entry of fluid from the front of the piston means to the rear thereof during inward movement of the piston means, while maintaing a pressure less than atmospheric within said cylinder means to the rear of the piston means.
  • sealing means on the cylinder means comprising a flexible, fluid-impermeable tubular boot
  • tubular boot having one peripheral edge portion sealingly fixed around said connecting rod and another peripheral edge portion sealingly fixed around said cylinder means, whereby the outer open end of the cylinder means is sealed closed.
  • said piston means comprising a cylindrical member connected to said connecting rod;
  • sealing means on the piston means comprising an annular, elastically deformable cup seal around said cylindrical member and an annular, disk-shaped follower seal located behind said cup seal;
  • cup seal facing toward the front of the piston means and having an inner circular flange *on said cylindrical member, an outer circular flange for wiping the interior of said hollow cylinder means, and a web therebetween;
  • annular follower seal having an inner diameter greater than the external diameter of the cylindrical member of the piston means, whereby said cylindrical member and said follower seal define an annular space therebetween;
  • sealing means on the cylinder means comprising a flexible, fluid-impermeable tubular boot
  • tubular boot having one peripheral edge portion sealingly fixed around said connecting rod and another peripheral edge portion sealingly fixed around said cylinder means, whereby the outer open end of the cylinder means is sealed closed.
  • air bleed valve means associated with said fluid enclosure
  • said adjusting means including means for adjusting the air bleed valve means to an inoperable condition in which the valve means is always closed.
  • flexible diaphragm means sealing said first recited fluid enclosure from said second fluid enclosure;
  • separator means for separating said compartments, said separator means comprising:
  • a free-floating main body element having a first surface, facing toward said driving fluid compartment, and a second surface, opposite said first surface, facing toward said driven fluid compartment;
  • said main body element having at least one fluid passage extending therethrough from the first to the second surface;
  • said soft washer maintaining the hard washer out of contact with the diaphragm in all positions of flexing movement of the diaphragm.
  • means including a first housing portion, defining a driving fluid compartment
  • hollow cylinder means communicating with said driving fluid compartment
  • piston means mounted for reciprocal movement inwardly and outwardly within said cylinder means
  • separator means separating said compartments
  • said separator means comprising means, including a flexible fluid imperable diaphragm, for sealing each of said said fluid compartments from the other;
  • means including a first housing portion, defining a driving fluid compartment
  • hollow cylinder means communicating with said driving fluid compartment
  • piston means mounted for reciprocal movement inwardly and outwardly within said cylinder means
  • separator means separating said compartments
  • said separator means comprising means, including a flexible fluid-impermeable diaphragm, for sealing each of said fluid compartments from the other;
  • said soft washer maintaining the hard washer out of contact with the diaphragm in all positions of flexing movement of the diaphragm.
  • means including a first housing portion, defining a driving fluid compartment
  • hollow cylinder means communicating with said driving fluid compartment
  • piston means mounted for reciprocal movement inwardly and outwardly within said cylinder means
  • separator means separating said compartments
  • said separator means comprising means, including a flexible fluid-impermeable diaphragm, for sealing each of said fluid compartments from the other;
  • a free-floating main 'body element having a first surface, facing toward said driving fluid compartment, and a second surface, opposite said first surface, facing toward said driven fluid compartment;
  • said main body element including an outer peripheral portion
  • said flexible diaphragm being located. between the main body element and said driven fluid compartment;
  • said main body element having at least one fluid passage extending therethrough from the first to the second surface;
  • said fluid passage comprising means for communicating with said driving fluid compartment
  • said disk having an area substantially larger than the area of the interior cross section of said hollow cylinder means.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
US590429A 1966-10-28 1966-10-28 Pump with piston and diaphragm Expired - Lifetime US3392674A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
US590429A US3392674A (en) 1966-10-28 1966-10-28 Pump with piston and diaphragm
DE19671653624 DE1653624A1 (de) 1966-10-28 1967-09-30 Pumpe
DE19671728490 DE1728490A1 (de) 1966-10-28 1967-09-30 Pumpe
GB50607/69A GB1208004A (en) 1966-10-28 1967-10-04 Pump with piston and diaphragm
GB45100/67A GB1208003A (en) 1966-10-28 1967-10-04 Pump with piston and diaphragm
CH1612268A CH500380A (de) 1966-10-28 1967-10-27 Pumpe
CH1509667A CH485121A (de) 1966-10-28 1967-10-27 Pumpe
JP42069039A JPS504882B1 (de) 1966-10-28 1967-10-28

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US590429A US3392674A (en) 1966-10-28 1966-10-28 Pump with piston and diaphragm

Publications (1)

Publication Number Publication Date
US3392674A true US3392674A (en) 1968-07-16

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Family Applications (1)

Application Number Title Priority Date Filing Date
US590429A Expired - Lifetime US3392674A (en) 1966-10-28 1966-10-28 Pump with piston and diaphragm

Country Status (5)

Country Link
US (1) US3392674A (de)
JP (1) JPS504882B1 (de)
CH (1) CH485121A (de)
DE (2) DE1653624A1 (de)
GB (2) GB1208004A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3925988A (en) * 1973-11-30 1975-12-16 Beck Louis Pump having spring-loaded piston shaft assembly
US4021155A (en) * 1975-11-13 1977-05-03 Sundstrand Corporation Oil burner pumping system with air purging valve
EP0175105A1 (de) * 1984-08-21 1986-03-26 Wolfgang Eichler KG Membranpumpe, insbesondere zum Dosieren von Flüssigkeiten
FR2845734A1 (fr) * 2002-05-11 2004-04-16 Horst Kleibrink Soupape de decharge d'huile a ressort pour compresseur a membrane

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4050859A (en) * 1976-07-01 1977-09-27 Graco Inc. Diaphragm pump having a reed valve barrier to hydraulic shock in the pressurizing fluid
US6135301A (en) * 1994-03-28 2000-10-24 Mitsubishi Jukogyo Kabushiki Kaisha Swaying hoisted load-piece damping control apparatus
WO2017157478A1 (en) * 2016-03-18 2017-09-21 Ecolab Usa Inc. Apparatus arranged for providing a liquid medium from a storage container

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US581469A (en) * 1897-04-27 Pump-valve
US2303597A (en) * 1940-05-09 1942-12-01 Infilco Inc Measuring pump
US2792790A (en) * 1950-08-07 1957-05-21 Frank R Capps Fluid pump
US3052188A (en) * 1960-03-17 1962-09-04 Pressure Products Ind Inc High pressure diaphragm compressors and pumps
US3207081A (en) * 1962-04-24 1965-09-21 Burckhardt Ag Maschf Automatic system for fluidtightly holding the valve-carrying head on a piston-operated machine subjected to high pressures
US3318250A (en) * 1966-03-09 1967-05-09 Pressure Products Ind Inc High pressure diaphragm compressors and pumps

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US581469A (en) * 1897-04-27 Pump-valve
US2303597A (en) * 1940-05-09 1942-12-01 Infilco Inc Measuring pump
US2792790A (en) * 1950-08-07 1957-05-21 Frank R Capps Fluid pump
US3052188A (en) * 1960-03-17 1962-09-04 Pressure Products Ind Inc High pressure diaphragm compressors and pumps
US3207081A (en) * 1962-04-24 1965-09-21 Burckhardt Ag Maschf Automatic system for fluidtightly holding the valve-carrying head on a piston-operated machine subjected to high pressures
US3318250A (en) * 1966-03-09 1967-05-09 Pressure Products Ind Inc High pressure diaphragm compressors and pumps

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3925988A (en) * 1973-11-30 1975-12-16 Beck Louis Pump having spring-loaded piston shaft assembly
US4021155A (en) * 1975-11-13 1977-05-03 Sundstrand Corporation Oil burner pumping system with air purging valve
EP0175105A1 (de) * 1984-08-21 1986-03-26 Wolfgang Eichler KG Membranpumpe, insbesondere zum Dosieren von Flüssigkeiten
FR2845734A1 (fr) * 2002-05-11 2004-04-16 Horst Kleibrink Soupape de decharge d'huile a ressort pour compresseur a membrane

Also Published As

Publication number Publication date
GB1208003A (en) 1970-10-07
JPS504882B1 (de) 1975-02-25
DE1653624A1 (de) 1971-09-16
CH485121A (de) 1970-01-31
GB1208004A (en) 1970-10-07
DE1728490A1 (de) 1973-04-12

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