EP0280745B1 - Pompe à membrane à piston - Google Patents

Pompe à membrane à piston Download PDF

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Publication number
EP0280745B1
EP0280745B1 EP87102867A EP87102867A EP0280745B1 EP 0280745 B1 EP0280745 B1 EP 0280745B1 EP 87102867 A EP87102867 A EP 87102867A EP 87102867 A EP87102867 A EP 87102867A EP 0280745 B1 EP0280745 B1 EP 0280745B1
Authority
EP
European Patent Office
Prior art keywords
piston
valve body
valve
space
diaphragm
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
EP87102867A
Other languages
German (de)
English (en)
Other versions
EP0280745A1 (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.)
SPX Flow Technology Germany GmbH
Original Assignee
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 und Luebbe GmbH filed Critical Bran und Luebbe GmbH
Priority to DE8787102867T priority Critical patent/DE3771065D1/de
Priority to ES87102867T priority patent/ES2022824B3/es
Priority to EP87102867A priority patent/EP0280745B1/fr
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 connected to the piston work chamber for hydraulic fluid and optionally devices for adjusting the Föredermenge, a arranged in the piston, provided with a valve seat central bore for connecting the piston work chamber to the reservoir, a valve body interacting with the valve seat coaxially displaceably guided, a device for sealing Pressing the valve body against the valve seat and lifting the valve body from its rear dead center when the piston falls below a predetermined axial distance nd the stop device, the valve body on the side facing away from the piston having a coaxial valve rod which is axially displaceably guided in a guide sleeve arranged coaxially in the housing to the longitudinal axis of the piston.
  • Such a piston diaphragm pump is known from FR-A-23 39 076.
  • the bottom of the piston is pierced by an axial opening into which an insert part is fitted, which consists of a sleeve Tax openings exist.
  • the sleeve sits directly on an axial control pin.
  • the control pin is attached to a piston that can move back and forth in the control cylinder and is moved by a feedback control.
  • oil flows through the valve opening and the passage in the piston at a position of the piston determined by the control pin during the piston stroke and runs back to the crankcase until the free end of the control pin closes the openings of the sleeve.
  • a feedback control for the pump is designed so that it can either get a constant pressure or constant volume characteristics to the pump.
  • a disadvantage of this design is that a feedback control is required for uniform operation, which avoids fluctuations in the delivery rate due to temperature fluctuations. Especially because the slide valve designed in this way does not open precisely and quickly due to the system.
  • a piston diaphragm pump in which a second concentric cylinder with a hydraulic pilot control and a second piston is arranged in a cylindrical piston, the second piston having a central bore with a valve opening for connecting the piston working space with the pantry.
  • the valve opening can be closed by a valve spindle.
  • the known seat valve in the second piston opens hydraulically in a pilot-controlled manner solely as a function of the pressure in the piston working space and thus differs both in its task and in the disadvantageously designed design solution.
  • the manufacture of the known diaphragm pump is correspondingly complex.
  • 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 is axially adjustable with a concentric bore, 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 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 with the piston and which slides in the sleeve in a metallic manner, does not permanently seal reliably.
  • the viscosity of the hydraulic fluid and the differential pressure between the working area and the storage area different leaks occur 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 piston diaphragm pump of the type mentioned is equipped according to the invention with the features of claim 1.
  • the piston diaphragm pump equipped in this way is easy to manufacture due to its simple construction, requires a minimum of seals and, due to the coaxial arrangement of the piston, valve seat, valve body and guide, allows closable operation with a much better seal without impairing the delivery setting.
  • the latter moves when the piston moves during the suction stroke when the pressure falls below one predetermined distance of the piston from its rear dead center position lifted from the valve seat and thereby created a direct connection between the piston working space and the reservoir for hydraulic fluid, so that the further movement of the piston into its rear dead center position causes no 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 continuously adjusted, 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.
  • a seal 11 provided Piston 10 guided axially.
  • 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 hole 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.
  • 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 guide sleeve 17 can e.g. 4, so that the stop projection 24 during the suction stroke 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 and thus a lifting of the valve body 19 from 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 already has the greater part of its forward movement behind it, so that the part of the piston stroke which determines the flow rate is only 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 described piston diaphragm pump 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)

Claims (7)

  1. Pompe à membrane à piston pourvue d'un carter, d'une chambre de refoulement (21) disposée dans celui-ci, d'une chambre de travail de piston (20) remplie de liquide hydraulique en état de fonctionnement, qui est séparée de la première par au moins une membrane (23) serrée de manière hermétique, d'un piston guidé se déplaçant de manière étanche dans cette chambre, pour assurer l'alternance de la course de déplacement de la membrane, d'une chambre d'approvisionnement (27) du liquide hydraulique reliée par au moins une soupape à la chambre de travail du piston, ainsi que, le cas échéant, de dispositifs pour régler la quantité refoulée, d'un alésage central disposé dans le piston (10) pourvu d'un siège de soupape (13), qui est destiné à relier la chambre de travail du piston à la chambre d'approvisionnement, d'un corps de soupape (19), guidé de manière mobile coaxialement à celui-ci, d'un dispositif destiné à appuyer de manière étanche le corps de soupape (19) sur le siège de soupape (13) et d'un dispositif de butée (24) soulevant le corps de soupape (19) endessous d'une distance axiale préétablie du piston (10) à son point mort bas, tandis que le corps de soupape (19) présente sur son côté opposé au piston (10) une tige de soupape (18) coaxiale, qui est guidée de manière mobile avec limitation axiale dans un manchon de guidage (17) disposé dans le carter (2), coaxialement à l'axe longitudinal du piston (10),
    caractérisée en ce que :
    le manchon de guidage (17) est fixé dans le carter (9) avec possibilité de déplacement coaxialement à l'axe longitudinal du piston (10) et en ce qu'il est prévu pour le réglage du point de soulèvement du corps de soupape (19) du siège de soupape (13) et, par suite, de la course de piston utile, une broche filetée (15) avec un bouton de réglage (14), qui est reliée au manchon de guidage (17) et peut tourner dans un alésage fileté (9a) du carter (9) coaxial au piston (10).
  2. Pompe à membrane à piston selon la revendication 1, caractérisée en ce que la tige de soupape (18) présente une saillie de butée (24) associée à une surface du manchon de guidage (17) opposée au corps de soupape (19), afin de limiter le déplacement du corps de soupape en direction du piston.
  3. Pompe à membrane à piston selon l'une des revendications 1 ou 2, sur laquelle le carter de pompe (9) est relié à un carter de mécanismes (1), dans la chambre de mécanismes (27) duquel sont disposées une roue d'entraînement (3) pourvue d'un excentrique (4) actionnable par un moteur et une bielle (5) reliée par un axe de crosse de piston (6) à une tête (7) du piston (10), qui enserre son excentrique (4), caractérisée en ce que l'alésage (25) central du piston (10) est relié à la chambre de mécanisme (27) d'entraînement , qui sert en même temps de chambre d'approvisionnement pour le liquide hydraulique et est soumise à la pression extérieure.
  4. Pompe à membrane à piston selon l'une des revendications 1 à 3, caractérisée en ce qu'il est prévu pour serrer le corps de soupape (19) sur le siège de soupape (13) au moins un dispositif à ressort (16) s'appuyant sur le carter de pompe (9), ou sur le manchon de guidage ou sur la broche filetée (15).
  5. Pompe à membrane à piston, selon l'une des revendications 1 à 4, caractérisée en ce que le corps de soupape (19) présente une saillie de déplacement (28) qui s'avance dans l'alésage (25) du piston (10) dans la position de fermeture s'appuyant contre le siège de soupape (13) et qui, lors de l'ouverture et de la fermeture du corps de soupape (19) constitue entre elle et la paroi de l'alésage (25) une fente annulaire aux dimensions préétablies.
  6. Pompe à membrane à piston selon l'une des revendications 1 à 5, sur laquelle la chambre de travail du piston (20) comprend une chambre à membrane (20c) avoisinant la membrane (23) et une chambre cylindrique (20d) recevant le piston (10) et reliée à celle-ci, caractérisée en ce que l'axe longitudinal du piston (10) et de la chambre cylindrique (20d) s'étend de manière essentiellement perpendiculaire à l'axe médian de la membrane (23).
  7. Pompe à membrane à piston selon l'une des revendications 3 à 6, caractérisée en ce que le dispositif de butée présente sur une paroi latérale de la chambre du mécanisme d'entraînement (27) une saillie de manoeuvre s'avançant dans un évidement latéral du piston (10) prévu entre la tête du piston (7) et un joint d'étanchéité du piston (11), qui est déplaçable en direction de l'axe longitudinal de piston, et une tige de butée disposée sur celle-ci ou sur le corps de soupape, qui traverse l'alésage (25) du piston (10) et qui soulève le corps de soupape (19) du siège de soupape (13).
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
DE8787102867T DE3771065D1 (de) 1987-02-28 1987-02-28 Kolbenmembranpumpe.
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
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 EP0280745A1 (fr) 1988-09-07
EP0280745B1 true 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
ES2238968T3 (es) * 1996-06-07 2005-09-16 Hydro Leduc Bomba de alta presion para cualquier liquido.
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

Family Cites Families (11)

* 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
US3149469A (en) * 1962-04-27 1964-09-22 Milton Roy Co Controlled volume pump
GB1280518A (en) * 1969-10-08 1972-07-05 Vni K I T I Gidromashinostroen Control device for metering pumps
SU486142A1 (ru) * 1971-10-27 1975-09-30 Предприятие П/Я М-5356 Поршневой насос
BE789518A (fr) * 1971-11-16 1973-01-15 Ransburg Corp Pompe pour appareil de pulverisation
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
SE7700353L (sv) * 1976-01-20 1977-07-21 Warwick Pump & Eng Co Hogtryckspump
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
JPS6019973A (ja) * 1983-07-14 1985-02-01 Asahi Okuma Ind Co Ltd ダイアフラムポンプ

Also Published As

Publication number Publication date
EP0280745A1 (fr) 1988-09-07
ES2022824B3 (es) 1991-12-16
US4773831A (en) 1988-09-27
DE3771065D1 (de) 1991-08-01

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