US3433161A - Diaphragm pump - Google Patents

Diaphragm pump Download PDF

Info

Publication number
US3433161A
US3433161A US618615A US3433161DA US3433161A US 3433161 A US3433161 A US 3433161A US 618615 A US618615 A US 618615A US 3433161D A US3433161D A US 3433161DA US 3433161 A US3433161 A US 3433161A
Authority
US
United States
Prior art keywords
pressure
chamber
valve
diaphragm
fluid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US618615A
Other languages
English (en)
Inventor
Gerhard Vetter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lewa Herbert Ott GmbH and Co KG
Original Assignee
Lewa Herbert Ott GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lewa Herbert Ott GmbH and Co KG filed Critical Lewa Herbert Ott GmbH and Co KG
Application granted granted Critical
Publication of US3433161A publication Critical patent/US3433161A/en
Assigned to LEWA HERBERT OTT KG reassignment LEWA HERBERT OTT KG CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE SEPTEMBER 17, 1976 Assignors: LEWA HERBERT OTT
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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

Definitions

  • the present invention relates to a diaphragm pump in which the diaphragm separates a pump chamber and/ or a pressure fluid pipe from a pressure fluid chamber, the pressure fluid chamber communicating with a pressure fluid reservoir both by an inlet valve to supplement the fluid and by an overflow valve to limit the fluid pressure generated by a displacement piston.
  • the diaphragm is usually arranged in a chamber, the walls of which are cup shaped and contain holes, the cup-shaped surfaces determining the end positions of the diaphragm. If, for example, the pressure in the pump chamber drops below a given value, or if too much pressure fluid passes into the fluid chamber by way of the inlet valve, the diaphragm will abut the cup-shaped surface adjacent the pump chamber. In order to prevent the diaphragm from being overstrained in the process, the holes in the cup-shaped walls are made small. However, this creates difliculties in production. Small holes are also disadvantageous, particularly when conveying viscous fluids, since many fluids cannot pass through the holes rapidly enough.
  • the present invention is directed towards providing a diaphragm valve in which overstraining of the diaphragm is avoided without incurring the above disadvantages. This is achieved by varying the closing force of the overflow valve in dependence on the pressure in the pump chamber, in the conveying pipe or in both.
  • the closing force of the overflow valve is generated by a hydraulic means controlled by the pressure of the pump chamber, of the conveying pressure pipe or of both, the means urging a valve head onto a seat with a valve spring being interposed therebetween so as to control the overflow valve.
  • a hydraulic device provides a convenient means for transferring the controlling pressure to the valve spring, the latter allowing the overflow valve to be opened without displacing the pressure fluid column of the hydraulic means.
  • the valve head is accordingly not subject to the forces of inertia of the latter.
  • FIG. 1 is a view, part diagrammatic and part in section
  • FIG. 2 shows a detail of the pump shown in FIG. 1.
  • the diaphragm pump has a driving mechanism 1, a stroke adjusting mechanism 2, and a pump head 3.
  • the head 3 contains a pump chamber 4 for the fluid to be con veyed, a pressure fluid chamber 5 and a pressure fluid reservoir 6.
  • a diaphragm 7 separates the chamber 4 and its conveying pipe 4a from the chamber 5. Between the chamber 5 and reservoir 6 are an inlet valve 8 and an overflow valve 9.
  • the diaphragm 7 follows the pressure changes and transmits them to the fluid to be conveyed.
  • One-way valves 12 and 13 provide for the conversion of the pressure fluctuations into a pumping movement for the fluid.
  • the inlet valve 8 comprises a tappet with a valve head 14, a spring 15, and a set screw 16. If the pressure in the chamber 5 drops a given value below the pressure in reservoir 6, fluid will flow out of the reservoir 6 and into the chamber 5 through the valve 8. This flow adds to any leakage of fluid which may occur from the reservoir 6 into the chamber 5 through the seal 11.
  • the overflow valve 9 contains a chamber 23, a head 17, a seat 18, a spring 19, and a set screw 20 to adjust the force of the spring 19.
  • a known method for meeting this danger is to limit the movement of the diaphragm 7 with two opposingly mounted cup-shaped walls. These walls contain holes 21 and 22 so that the diaphragm 7 communicates with the chambers 4 and 5, respectively.
  • the force of the valve spring 19 is adjusted so that, when a given pressure is exceeded, the overflow valve 9 will respond and allow the surplus pressure fluid to flow back from the chamber 5 into the reservoir 6.
  • the present invention is based on the principle that the closing force of the overflow valve 9 should be controlled in dependence on the pressure in the pump chamher 4 or in the pipe 4a or in both.
  • the diaphragm 7 when it covers the holes 21, 22 at either end of its movement, is subjected to a constant pressure resulting from the diflerence between the pressures in the chambers 4 and 5.
  • the pressure in the chamber 4- is low, the strain on the diaphragm 7 is not increased, and when it is high, the pumping head is not cut down.
  • the closing force of the overflow valve 9 is controlled by a hydraulic actuator 30 which is subjected to the pressure in the pump chamber 4 and which presses the valve head 17 onto the seat 18 through the intermediary of the spring 19. If the pressure differential between the chambers 4 and 5 ex ceeds a given value, the valve spring 19 will be further compressed beyond the degree of compression determined by the hydraulic actuator 30 or set screw 20; the fluid column of the hydraulic actautor need not therefore move when the overflow valve 9 is being released, and the response time of the valve 9 is short.
  • the hydraulic actuator 30, only diagrammatically indicated in FIG. 1, is shown in detail in FIG. 2 and comprises a pressure pipe 31, a cylinder 32 having a piston 33 mounted therein, a thrust rod 34 fixed on one end to the piston and provided with a spring seat 35 at the opposite end, and two stops 36 and 37 arranged between the spring seat 35 and piston 33 to limit the movement of the piston 33.
  • the stop 36 in the region of the spring seat 35, is formed by a sleeve-shaped spring housing 38 which in turn is a portion of the set screw 20.
  • a given selected minimum tension can be set for the spring 19 by appropriately adjusting the spring housing-set screw 38, 20.
  • the valve head 17 is accordingly pressed against the seat 18 with the desired amount of tension.
  • the stop 37 in the region of the piston 33, is in the form of a tubular screw 39 so that a given selected maximum tension can be set for the valve spring 19 by allowing the piston 33 to compress the spring 19 only to a certain degree.
  • Apertures 40 are provided in the cylinder 32 to give access to a suitable means such as a bar for turning the housing 38 and the tubular screw 39.
  • the pressure chamber of the cylinder 32 and the valve chamber 23 are respectively sealed off from these apertures by means of a sealing ring 41 mounted on the piston 33 and by a seal 42 mounted in housing 38 encompassing thrust rod 34.
  • the housing 38 and tubular screw 39 contain holes 43 and 44, respectively, for receiving therein the turning means.
  • the apertures 40 in the housing of the hydraulic means 30 can be closed by detachable covers, if so desired.
  • a throttle 45 is arrangedin parallel with a nonreturn valve 46 in the pressure pipe 31 of the hydraulic actuator 30.
  • the valve 46 is connected to open when fluid flows into the hydraulic cylinder 32 and closes when the fluid flows back towards the pump chamber.
  • the action of the throttle 45 is adjustable. If such adjustability is not required, the throttle 45 can be dispensed with as a separate component and instead a nonreturn valve 46, with a slight leakage, can be used.
  • the nonreturn valve comprises a ball 47 and a valve spring 28.
  • the pressure fluid acting on the hydraulic cylinder 32 can come directly from the pump chamber 4; it is also possible for the hydraulic actuator 30 to be separated from the chamber 4 of the pipe 4a by a diaphragm or bellows.
  • the nonreturn valve 46 provides for the pressure loading of the cylinder 32 while the throttle 45 equalizes the pressure in the cylinder 32 with that in the chamber 4, in pipe 4a or in both. If the pressure pipe 31 does not open into the chamber 4, as illustrated, but instead leads into the pipe 4:: or a pressure tank associated therewith, the throttle 45 and nonreturn valve 46 can be omitted as their functions are fulfilled by the one-way valve 13.
  • the force for controlling the valve spring 19 may equally be drawn from a source which, although controlled by the pressure in the pump chamber 4, in pipe 4a or in both, does not take the energy for changing the position of the spring 19 from the chamber 4 or the pipe 4a.
  • a diaphragm pump comprising a pump head containing a pump chamber and a pressure fluid chamber with a diaphragm mounted therebetween, means to vary the pressure in said pressure fluid chamber to develop a pumping movement by said diaphragm, a pressure fluid reservoir, an inlet valve and an overflow valve connecting said pressure fluid chamber and said reservoir, said overflow valve comprising a chamber connected to both said pressure fluid chamber and said reservoir, a valve seat in said chamber, a valve head, spring means biasing said valve head into engagement with said valve seat to interrupt fluid flow through said chamber between saidpressure fluid chamber and said reservoir, and means for controlling said overflow valve in dependence on theipressure developed in said pump chamber comprising hydraulic actuator means operatively connected to said valve head and responsive to the pressure developed in said pump chamber, said hydraulic actuator means comprising a cylinder having a piston therein forming a pressure chamber, pressure pipe means connecting said cylinder pressure chamber to said pump chamber, a thrust rod one end of which is fixed to said piston, the other end of said rod forming a seat for
  • a diaphragm pump according to claim 2 in which said stop means are mounted interiorly of said cylinder and access aperture means are provided in the walls of said cylinder.
  • a diaphragm pump according to claim 3 in which sealing means are provided to seal off said pressure chamber and said valve chamber from said access aperture means.
  • a diaphragm pump according to claim 1 further comprising a nonreturn valve mounted in said pressure pipe, said nonreturn valve opening when pressure fluid flows into said hydraulic actuator and closing when said fluid flows out therefrom.
  • a diaphragm pump according to claim 5 further comprising adjustable throttle means connected to said pressure pipe in parallel to said nonreturn valve.
  • a diaphragm pump according to claim 1 further comprising means to adjust the biasing force of said spring.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
US618615A 1966-03-01 1967-02-27 Diaphragm pump Expired - Lifetime US3433161A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEL0052982 1966-03-01

Publications (1)

Publication Number Publication Date
US3433161A true US3433161A (en) 1969-03-18

Family

ID=7275062

Family Applications (1)

Application Number Title Priority Date Filing Date
US618615A Expired - Lifetime US3433161A (en) 1966-03-01 1967-02-27 Diaphragm pump

Country Status (4)

Country Link
US (1) US3433161A (fr)
DE (1) DE1528474B1 (fr)
FR (1) FR1512839A (fr)
GB (1) GB1167224A (fr)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3796516A (en) * 1972-08-08 1974-03-12 Cormick A Mc Bellows pump
JPS50106207A (fr) * 1973-08-04 1975-08-21
US4003679A (en) * 1975-04-02 1977-01-18 Hewlett-Packard Company High pressure pump with metering
US4022381A (en) * 1975-11-24 1977-05-10 Karliner Rudolf R Airless spray apparatus
US4116590A (en) * 1976-01-20 1978-09-26 Warwick Pump And Engineering Company Limited Diaphragm pump with pulse piston position responsive work fluid replenishment
DE2843054A1 (de) * 1978-10-03 1980-04-10 Bran & Luebbe Kolbenmembranpumpe
US4353684A (en) * 1980-09-05 1982-10-12 Superpressure, Inc. Pressure limiting device
US4806082A (en) * 1987-11-09 1989-02-21 Pennwalt Corporation Fluid actuated pump with improved flow-limiting fluid refill valve
US4865528A (en) * 1987-03-18 1989-09-12 Lewa Herbert Ott Gmbh & Co. Method and arrangement for starting an hydraulic diaphragm pump against load
US4934906A (en) * 1988-01-29 1990-06-19 Williams James F High pressure diaphragm pump
US5106274A (en) * 1990-07-23 1992-04-21 Mark Holtzapple Hermetic compressor
US5163820A (en) * 1987-11-16 1992-11-17 Karldom Corporation Airless sprayer with adjustable pressure unloading valve
US5186615A (en) * 1990-06-26 1993-02-16 Karldom Corporation Diaphragm pump
FR2765635A1 (fr) * 1997-07-07 1999-01-08 Sagem Pompe d'injection directe de combustible pour moteur a allumage commande et systeme d'injection comportant une telle pompe
US5863185A (en) * 1994-10-05 1999-01-26 Franklin Electric Co. Liquid pumping system with cooled control module
CN105392992A (zh) * 2013-08-05 2016-03-09 Seko股份公司 自校准复位弹簧泵，具体而言自校准复位弹簧计量泵
US20170037840A1 (en) * 2014-07-11 2017-02-09 Prominent Gmbh Diaphragm pump with reduced leak extension in the event of overload

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1651964A (en) * 1924-06-16 1927-12-06 Nelson John Air compressor
US2753805A (en) * 1954-06-24 1956-07-10 Boivinet Jean Regulator for diaphragm pumps
US2971465A (en) * 1956-05-15 1961-02-14 Separation Sa Franc Pour La Diaphragm pumps

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1961918A (en) * 1930-06-24 1934-06-05 Frank R West Compressor structure
DE953489C (de) * 1954-06-24 1956-11-29 Jean Boivinet Regler fuer Membranpumpen
US3151562A (en) * 1962-04-25 1964-10-06 Charles A Swartz Pump device
NL145924B (nl) * 1962-07-10 1975-05-15 Philips Nv Inrichting bevattende een cilinder en een daarin beweegbare met een drijfwerk gekoppelde zuiger, waarbij de afdichting tussen zuiger en cilinder als rolmembraan is uitgevoerd.
FR1414364A (fr) * 1964-11-16 1965-10-15 Philips Nv Dispositif de compression ou de détente d'un fluide

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1651964A (en) * 1924-06-16 1927-12-06 Nelson John Air compressor
US2753805A (en) * 1954-06-24 1956-07-10 Boivinet Jean Regulator for diaphragm pumps
US2971465A (en) * 1956-05-15 1961-02-14 Separation Sa Franc Pour La Diaphragm pumps

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3796516A (en) * 1972-08-08 1974-03-12 Cormick A Mc Bellows pump
JPS50106207A (fr) * 1973-08-04 1975-08-21
JPS5732230B2 (fr) * 1973-08-04 1982-07-09
US4003679A (en) * 1975-04-02 1977-01-18 Hewlett-Packard Company High pressure pump with metering
US4022381A (en) * 1975-11-24 1977-05-10 Karliner Rudolf R Airless spray apparatus
US4116590A (en) * 1976-01-20 1978-09-26 Warwick Pump And Engineering Company Limited Diaphragm pump with pulse piston position responsive work fluid replenishment
DE2843054A1 (de) * 1978-10-03 1980-04-10 Bran & Luebbe Kolbenmembranpumpe
US4353684A (en) * 1980-09-05 1982-10-12 Superpressure, Inc. Pressure limiting device
US4865528A (en) * 1987-03-18 1989-09-12 Lewa Herbert Ott Gmbh & Co. Method and arrangement for starting an hydraulic diaphragm pump against load
US4806082A (en) * 1987-11-09 1989-02-21 Pennwalt Corporation Fluid actuated pump with improved flow-limiting fluid refill valve
US5163820A (en) * 1987-11-16 1992-11-17 Karldom Corporation Airless sprayer with adjustable pressure unloading valve
US4934906A (en) * 1988-01-29 1990-06-19 Williams James F High pressure diaphragm pump
US5186615A (en) * 1990-06-26 1993-02-16 Karldom Corporation Diaphragm pump
US5106274A (en) * 1990-07-23 1992-04-21 Mark Holtzapple Hermetic compressor
US5863185A (en) * 1994-10-05 1999-01-26 Franklin Electric Co. Liquid pumping system with cooled control module
FR2765635A1 (fr) * 1997-07-07 1999-01-08 Sagem Pompe d'injection directe de combustible pour moteur a allumage commande et systeme d'injection comportant une telle pompe
WO1999002851A1 (fr) * 1997-07-07 1999-01-21 Sagem S.A. Pompe d'injection directe de combustible pour moteur a allumage commande et systeme d'injection comportant une telle pompe
US6178951B1 (en) * 1997-07-07 2001-01-30 Sagem Sa Direct injection fuel pump for engine with controlled ignition and injection system comprising same
CN105392992A (zh) * 2013-08-05 2016-03-09 Seko股份公司 自校准复位弹簧泵，具体而言自校准复位弹簧计量泵
CN105392992B (zh) * 2013-08-05 2017-09-05 Seko股份公司 自校准复位弹簧泵，具体而言自校准复位弹簧计量泵
US20170037840A1 (en) * 2014-07-11 2017-02-09 Prominent Gmbh Diaphragm pump with reduced leak extension in the event of overload
US10378530B2 (en) * 2014-07-11 2019-08-13 Prominent Gmbh Diaphragm pump with reduced leak extension in the event of overload

Also Published As

Publication number Publication date
DE1528474B1 (de) 1970-07-23
GB1167224A (en) 1969-10-15
FR1512839A (fr) 1968-02-09

Similar Documents

Publication Publication Date Title
US3433161A (en) Diaphragm pump
US3957399A (en) Diaphragm pump
US5165869A (en) Diaphragm pump
US6295914B1 (en) Pressure intensifier for fluids, particularly for hydraulic liquids
US2424035A (en) Pressure governor for pumps
US4161308A (en) Switching valve assembly for fluid motor-driven injector pump
US2562615A (en) Hydraulic control system responsive to pressure and flow rate
CA1061641A (fr) Dispositif pour ameliorer le rendement d'une pompe a membrane
US2753805A (en) Regulator for diaphragm pumps
US3112705A (en) Two-speed hydraulic pumps
US4019837A (en) Pressure unloading apparatus for a diaphragm pump
US5380159A (en) Pressure compensation device for high-pressure liquid pump
US3416453A (en) Diaphragm-type compressors and pumps
US3286640A (en) Automatic control for hydraulically driven diaphragm-operated compressors and pumps subjected to very high pressures
US3285182A (en) Diaphragm metering pump
US4102609A (en) Valve control system for air powered vacuum pump
CN109611403A (zh) 一种具有减振功能的溢流型液压平衡阀
US4353684A (en) Pressure limiting device
US2667129A (en) Twin diaphragm pump with stressrelieved diaphragms
US4116590A (en) Diaphragm pump with pulse piston position responsive work fluid replenishment
US10788846B2 (en) Active surge chamber
US2993446A (en) Diaphragm piston pump
JPH0427392B2 (fr)
US2442631A (en) Pump
EP0035569A1 (fr) Pompe alternative

Legal Events

Date Code Title Description
AS Assignment

Owner name: LEWA HERBERT OTT KG

Free format text: CHANGE OF NAME;ASSIGNOR:LEWA HERBERT OTT;REEL/FRAME:004375/0501

Effective date: 19850104