EP0280745A1 - Pompe à membrane à piston - Google Patents

Pompe à membrane à piston Download PDF

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Publication number
EP0280745A1
EP0280745A1 EP87102867A EP87102867A EP0280745A1 EP 0280745 A1 EP0280745 A1 EP 0280745A1 EP 87102867 A EP87102867 A EP 87102867A EP 87102867 A EP87102867 A EP 87102867A EP 0280745 A1 EP0280745 A1 EP 0280745A1
Authority
EP
European Patent Office
Prior art keywords
piston
valve body
diaphragm pump
valve seat
valve
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.)
Granted
Application number
EP87102867A
Other languages
German (de)
English (en)
Other versions
EP0280745B1 (fr
Inventor
Dirk Petersen
Peter Wente
Rüdiger Bräuer
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.)
BRAN and LUEBBE
SPX Flow Technology Germany GmbH
Original Assignee
BRAN and LUEBBE
Bran und Luebbe GmbH
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 BRAN and LUEBBE, Bran und Luebbe GmbH filed Critical BRAN and LUEBBE
Priority to ES87102867T priority Critical patent/ES2022824B3/es
Priority to EP87102867A priority patent/EP0280745B1/fr
Priority to DE8787102867T priority patent/DE3771065D1/de
Priority to US07/035,904 priority patent/US4773831A/en
Publication of EP0280745A1 publication Critical patent/EP0280745A1/fr
Application granted granted Critical
Publication of EP0280745B1 publication Critical patent/EP0280745B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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 invention relates to a piston diaphragm pump, with a housing, a delivery chamber arranged therein, a piston working chamber separated from it by at least one sealingly clamped membrane, filled with hydraulic fluid in the operating state, a piston sealingly guided therein for alternating stroke deflection of the membrane, one via at least one valve storage space for hydraulic fluid connected to the piston working space and possibly devices for adjusting the delivery rate.
  • a bore parallel to the cylindrical piston working space is provided in the housing, which communicates with the diaphragm chamber via a connecting channel and is connected to the storage space at an axial distance therefrom.
  • a sleeve sealed on its circumference by three ring seals with a concentric bore is axially adjustable, in which a slide rod connected to the piston via a lost motion connection is guided for common movement, which briefly communicates an opening of the sleeve that communicates with the connecting channel during the suction stroke releases in front of the rear dead center position of the piston and thereby connects the piston working space filled with hydraulic fluid to the gear housing, which is under external pressure and serves as a storage space.
  • the slide rod which is laterally offset and connected to the piston and which slides in the sleeve, does not provide a reliable seal, different leakages occur depending on the operating temperature, the viscosity of the hydraulic fluid and the differential pressure between the working chamber and the storage chamber, which affect the delivery accuracy of the diaphragm pump.
  • three seals are required on the sleeve which is designed to be displaceable for adjusting the delivery flow, two of which are each dynamically loaded by the pressure pulsating between the suction stroke and the pressure stroke.
  • the object of the invention was to create a piston diaphragm pump of the type mentioned, which avoids undesirable leakages with a simple, inexpensive construction and enables a higher dosing accuracy.
  • the piston diaphragm pump of the type mentioned is equipped according to the invention with the features of claim 1.
  • the piston diaphragm pump designed in this way can be manufactured with less effort due to its simple construction, requires a minimum of seals and, because of the coaxial arrangement of the piston, valve seat, valve body and guide, allows low-wear operation with a much better seal without impairing the flow rate setting.
  • the latter will move when the piston moves during the suction stroke if the piston falls below a predetermined distance from its rear dead center position is lifted from the valve seat, thereby creating a direct connection between the piston working space and the storage space for hydraulic fluid, so that the further movement of the piston into its rear dead center position does not cause any further deflection of the diaphragm.
  • the guide sleeve for example by means of a threaded sleeve provided with an adjustment button, the delivery flow of the piston diaphragm pump can be adjusted continuously, for example between 100% and 25%.
  • a displacement projection projecting into the central bore of the piston is provided on the valve body, which forms an annular gap together with the wall of the bore during the closing or opening of the valve body, a stable starting position of the membrane on the contact surface facing away from the delivery chamber is ensured.
  • the piston diaphragm pump shown in FIG. 1 has an engine housing 1 connected to the pump housing 9 with a worm wheel 3 rotatably mounted therein and drivable via a worm shaft 2 with an eccentric 4.
  • the piston 10 carries a cross head 7, which is connected via a cross head pin 6 to a connecting rod 5 comprising the eccentric 4. In this way, the rotary movement of the worm shaft 2 is converted into a reciprocating movement of the piston 10.
  • the piston 10 has a valve seat 13 arranged centrally in its end face 12 and a central bore 25.
  • a housing cover 22 is detachably fastened by threaded bolts.
  • a membrane 23 is clamped hermetically with its peripheral edge between the pump housing 9 and the housing cover 22.
  • the membrane separates a delivery chamber 21, which is provided in a conventional manner with inlet and outlet channels, not shown, from the piston working space 20, which comprises the cylinder space 20d adjoining the end face 12 of the piston 10 and the membrane chamber 20c communicating with it via a transverse channel 20a and an annular gap 20b .
  • the membrane 23 rests on a support plate 31 held in the pump housing 9 by means of a guide pin 31a.
  • a threaded spindle 15 is screwed into a bore 9a, which runs coaxially to the cylinder space 20d and is provided with an internal thread 9b, and which is connected at its end protruding from the pump housing 9 to an adjusting knob 14 for common rotation.
  • the threaded spindle 15 has at its end facing the piston 10 a central blind bore in which a guide sleeve 17 is fixed.
  • a valve rod 18 is slidably guided, which carries at its end facing the piston 10 a valve body 19 which is pressed by a helical spring 16 sealingly against the valve seat 13 of the piston 10.
  • a stop projection 24 is attached, which by engagement with the end surface facing away from the piston 10 17a of the guide sleeve 17 limits the displacement of the valve rod 18 and the valve body 19 in the direction of the piston 10.
  • the valve body 19 carries in its closed position projecting into the bore 25, provided with a chamfer 29 cylindrical or slightly conical displacement projection 28, which forms an annular gap 30 with the surrounding wall of the bore 25 during the opening and closing movement of the valve body 19.
  • This annular gap always displaces hydraulic fluid from the piston working space 20 into the engine space 27 serving as a storage space, depending on the pressure in the piston working space 20, and thus ensures a stable, reproducible initial position of the membrane 23 on the support plate 31.
  • At least one connecting channel 26 is provided in the crosshead 7.
  • the piston 10 then moves forward in the subsequent pressure stroke from its rear dead center position HT, it rests with the valve seat 13 in a sealing manner against the valve body 19 and then moves the valve body 19 against the force of the helical compression spring 16 while moving the valve rod 18 backwards in the direction of the Guide sleeve 17 with in the direction of its front dead center position VT, so that the valve body 19th during the main part of the pressure stroke sealingly against the valve seat 13.
  • the guide sleeve 17 can e.g. 4 so that the stop protrusion 24 comes into contact with the piston 10 on the stop surface 17a of the guide sleeve 17 after a relatively slight movement of the valve body 19 during the suction stroke and thus the valve body 19 is lifted off the valve seat 13 causes.
  • the piston working space 20 is thus connected to the engine space 27.
  • the valve body closes during the pressure stroke only after the piston 10 has already completed the greater part of its forward movement, so that the part of the piston stroke which determines the flow rate only makes up 25% of the maximum flow rate effected when the guide sleeve 17 according to FIG. 2 is in position.
  • the guide sleeve 17 can be adjusted to any intermediate position in order to regulate the flow accordingly.
  • the piston diaphragm pump explained above on the basis of a preferred embodiment requires only a single seal 32 on the threaded spindle 15 and enables the flow rate to be adjusted continuously without additional adjustment of the piston stroke, with the valve body 19 being arranged coaxially with the piston 10.
  • the piston diaphragm pump described can be modified by the person skilled in the art in various ways depending on the requirements, provided that the coaxial arrangement of the piston, valve seat and valve body is retained.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)
EP87102867A 1987-02-28 1987-02-28 Pompe à membrane à piston Expired - Lifetime EP0280745B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
ES87102867T ES2022824B3 (es) 1987-02-28 1987-02-28 Bomba de embolo de membrana
EP87102867A EP0280745B1 (fr) 1987-02-28 1987-02-28 Pompe à membrane à piston
DE8787102867T DE3771065D1 (de) 1987-02-28 1987-02-28 Kolbenmembranpumpe.
US07/035,904 US4773831A (en) 1987-02-28 1987-04-02 Diaphragm plunger pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP87102867A EP0280745B1 (fr) 1987-02-28 1987-02-28 Pompe à membrane à piston

Publications (2)

Publication Number Publication Date
EP0280745A1 true EP0280745A1 (fr) 1988-09-07
EP0280745B1 EP0280745B1 (fr) 1991-06-26

Family

ID=8196788

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87102867A Expired - Lifetime EP0280745B1 (fr) 1987-02-28 1987-02-28 Pompe à membrane à piston

Country Status (4)

Country Link
US (1) US4773831A (fr)
EP (1) EP0280745B1 (fr)
DE (1) DE3771065D1 (fr)
ES (1) ES2022824B3 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5262068A (en) * 1991-05-17 1993-11-16 Millipore Corporation Integrated system for filtering and dispensing fluid having fill, dispense and bubble purge strokes
US5137482A (en) * 1991-07-29 1992-08-11 Hull Harold L Flushing device for inboard motors
EP1048849B1 (fr) * 1996-06-07 2005-03-16 Hydro Leduc Pompe à haute pression pour tous liquides
US6004105A (en) * 1998-02-23 1999-12-21 Warren Rupp, Inc. Diaphragm pump with adjustable stroke length
CN114320815B (zh) * 2021-12-17 2024-01-02 镇江长城注浆设备有限公司 一种全液控可注粘稠颗粒材料的注浆泵

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB786487A (en) * 1954-05-13 1957-11-20 Ernest Williams Improvements in or relating to pumps
GB1280518A (en) * 1969-10-08 1972-07-05 Vni K I T I Gidromashinostroen Control device for metering pumps
DE2255958A1 (de) * 1971-11-16 1973-05-24 Ransburg Corp Pumpe fuer eine spruehvorrichtung
FR2339076A1 (fr) * 1976-01-20 1977-08-19 Warwick Pump & Eng Co Pompes pour pressions elevees
DE3422357A1 (de) * 1983-07-14 1985-01-24 Asahiokuma Sangyo K.K., Owariasahi, Aichi Membranpumpe

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3149469A (en) * 1962-04-27 1964-09-22 Milton Roy Co Controlled volume pump
SU486142A1 (ru) * 1971-10-27 1975-09-30 Предприятие П/Я М-5356 Поршневой насос
US3910727A (en) * 1972-09-13 1975-10-07 Valve Syst Int Inc Metering pump
SU522338A1 (ru) * 1974-06-24 1976-07-25 Регулируемый плунжерный насос
SU727871A1 (ru) * 1977-04-12 1980-04-15 Britvin Lev N Дозировочна насосна установка
JPS58197481A (ja) * 1982-05-14 1983-11-17 Asahi Okuma Ind Co Ltd ダイアフラム方式による流体圧送方法およびその装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB786487A (en) * 1954-05-13 1957-11-20 Ernest Williams Improvements in or relating to pumps
GB1280518A (en) * 1969-10-08 1972-07-05 Vni K I T I Gidromashinostroen Control device for metering pumps
DE2255958A1 (de) * 1971-11-16 1973-05-24 Ransburg Corp Pumpe fuer eine spruehvorrichtung
FR2339076A1 (fr) * 1976-01-20 1977-08-19 Warwick Pump & Eng Co Pompes pour pressions elevees
DE3422357A1 (de) * 1983-07-14 1985-01-24 Asahiokuma Sangyo K.K., Owariasahi, Aichi Membranpumpe

Also Published As

Publication number Publication date
EP0280745B1 (fr) 1991-06-26
DE3771065D1 (de) 1991-08-01
ES2022824B3 (es) 1991-12-16
US4773831A (en) 1988-09-27

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