WO2000015962A1 - Pompe a double action - Google Patents

Pompe a double action Download PDF

Info

Publication number
WO2000015962A1
WO2000015962A1 PCT/SE1999/001571 SE9901571W WO0015962A1 WO 2000015962 A1 WO2000015962 A1 WO 2000015962A1 SE 9901571 W SE9901571 W SE 9901571W WO 0015962 A1 WO0015962 A1 WO 0015962A1
Authority
WO
WIPO (PCT)
Prior art keywords
pump
operating
working
chamber
pump according
Prior art date
Application number
PCT/SE1999/001571
Other languages
English (en)
Inventor
Svante Bahrton
Original Assignee
Svante Bahrton
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 Svante Bahrton filed Critical Svante Bahrton
Priority to AU62361/99A priority Critical patent/AU6236199A/en
Priority to EP99949506A priority patent/EP1112449A1/fr
Publication of WO2000015962A1 publication Critical patent/WO2000015962A1/fr

Links

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
    • F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
    • F04B11/005—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using two or more pumping pistons
    • 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
    • F04B43/073—Pumps having fluid drive the actuating fluid being controlled by at least one valve
    • F04B43/0736—Pumps having fluid drive the actuating fluid being controlled by at least one valve with two or more pumping chambers in parallel

Definitions

  • the present invention relates to a double-acting pump of the kind defined in the preamble of Claim 1.
  • the pump may therewith be of the kind that includes two rooms which are each divided into an operating chamber and a working, chamber by means of a respective moveable partition wall in the form of a piston or diaphragm, wherewith each of said operating and working chambers includes valve-controlled inlet and outlet means for a gaseous driving and operating medium and a liquid working medium transported by the pump.
  • Double-acting diaphragm or membrane pumps of this kind are known to the art, cf for instance EP Patent Specifications 0 132 913 and 0 181 756 in this regard.
  • the operating medium is normally air and the working medium is one of the liquids that are normally pumped through piping, primarily in the pharmaceutical, foodstuffs, chemical and paint industries.
  • One object of the present invention is to provide a novel and advantageous double-acting pump with which the aforesaid drawbacks can be eliminated, either completely or partially.
  • the object of the invention is achieved with a pump according to the accompanying Claim 1. Further embodiments of the invention are set forth in the accompanying dependent Claims.
  • the pump can be used to replace pressure vessels in, e.g., filling machines with a time pressure-system.
  • the pump can be combined conveniently with a venturi-like constriction combined with a diffuser placed downstream of the pump outlet, wherewith the velocity of the liquid is maintained at such a high magnitude as to create cavitation in the constriction.
  • the flow will be precisely constant even if the resistance in the pipe, or conduit, changes downstream of the constriction.
  • Liquid can be sucked into one working chamber without affecting the pumping of liquid from the other working chamber, when displacement movements of the partition walls are mutually independent (for instance when the partition walls have no mechanically fixed coupling relative to one another) , wherewith the pressure in the outlet conduit will be totally independent of the pressure in the inlet conduit.
  • the inflow of liquid to respective working chambers can be effected with a spring that is compressed in pumping liquid and that expands in sucking liquid in.
  • the operating chamber may be connected to a subpressure which is effective to cause liquid to be sucked into the working chamber.
  • a third alternative is to press liquid into the operating chamber. Liquid is pumped from the liquid chamber by pressurising respective operating chambers with preferably compressed air of constant although adjustable pressure.
  • Respective operating chambers are pressurised through the medium of an electrically operated three-path valve. These valves are controlled electronically such as to pressurise one operating chamber at a time, where- with liquid is forced out at the same time as liquid is sucked into the non-pressurised pump chamber.
  • the switch-over is effected at a frequency that is adapted to liquid flow re- quirements.
  • the electronic circuitry is adapted to ensure that a given time overlap is achieved each time pressu ⁇ sa- tion is switched from one operating chamber to the other. In other words, both operating chambers are pressurised simultaneously for a brief moment in time, e.g.
  • the instantaneous outflow may be greater than the inflow.
  • Fig. 1 is a sectional view of an inventive double-acting pump; and Figs. 2 and 3 illustrate respectively alternative embodiments of movement transmission devices.
  • partition walls have been illustrated and described as diaphragms, or membranes, it will be understood that the partition walls may alternatively comprise technically equivalent piston-cylinder devices in which the pistons fit in passageways and slide sealingly therealong.
  • the double-acting pump shown in Fig. 1 is a so-called diaphragm pump that includes a generally cylindrical pump housing 1 which has two rooms or spaces delimited by housing end walls 3. Each of these rooms is, in turn, divided into a working chamber 5 and an operating chamber 6 by means of a respective partition wall or diaphragm (membrane) unit 4, wherewith the working chambers 5 are located proximal to one another and the operating chambers 6 are located outwardly of associated diaphragm units 4.
  • the working chambers 5 are provided with valve-controlled inlets and outlets for liquid working medium transported by the pump. In the case of the Fig. 1 illustration, these inlets and outlets have the form of openings 7, 8 in the working chamber walls 3, said openings coacting with check valves 9.
  • check valves may have the form of ball valves for instance, they are preferably in the form of flap valves as in the illustrated case.
  • the working medium arrives at the pump in the arrowed direction through a conduit 10 which discharges into a space 11 located between the walls 3 and exits in a diametrically opposite space 12 which is also located between the walls 3, and continues out through an outlet conduit 13 in the arrowed direction.
  • the diaphragm units 4 consist of a round, preferably rigid central part 14 and a peripheral part 15 which is preferably made of a soft, pliable material and which is connected to the pump housing 1 at its radially outer edge. Each of the diaphragm units 4 is in contact with its respective resilient spring device 16.
  • Fig. 1 illustrates an embodiment in which this device has the form of a helical spring 16 situated in the liquid between the diaphragm units 4 and the inner working chambers walls 3.
  • the operating chambers 6 include openings which function as drive medium inlet and outlet means and which are connected to a net 20 ⁇ for a pressurised drive medium, via two-position three-path valves 21.
  • valves 21 are caused to take one or the other of said two positions by an electronic control unit 22.
  • the left-hand diaphragm unit 4 is shown just prior to its turning point at the end of its suction movement.
  • the liquid working medium is sucked from the space 11 through the inlet 7 with the check valve 9 open, and into the left-hand working chamber 5, wherewith the check valve 9 of the outlet 8 of said working chamber is held closed by the pressure exerted by the liquid portion that is pressed by the right-hand diaphragm unit 4 from the right-hand working chamber 5 into the space 12, said right-hand diaphragm unit 4 being close to the end of its pressure stroke at this stage.
  • the right-hand operating chamber 6 is connected to the drive medium net via the right- hand valve 21, whilst the left-hand operating chamber 6 is evacuated via the left-hand valve 21.
  • the left-hand operating chamber 6 of the Fig. 1 embodiment is pressurised via its associated three- path valve 21, which is controlled by the electronic control unit 22, liquid is forced out of the working chamber 5 and the spring 16 compressed at the same time.
  • the pressure force from the operating chamber always exceeds the force of the spring.
  • Air is evacuated from the right-hand operating chamber through the right-hand electropneumatic valve 21, which is controlled from the electronic unit 22.
  • the spring 16 therewith expands and liquid is sucked into the right-hand liquid chamber through the check valve 7, 9.
  • the control valves 21 switch over so as to pressurise the right-hand operating chamber and evacuate air from the left-hand operating chamber. The same sequence of events is repeated in the reverse order, and so on.
  • the electronic control unit 22 can be given the function of controlling the valves 21 so that both the left-hand and the right-hand operating chambers will be pressurised simultaneously for a very brief moment of time before the operating pressure is released from the operating chamber next in turn to be air-evacuated. This completely avoids pulsation of the flow at the outlet.
  • Fig. 2 shows an embodiment in which the resilient element 16 has been placed outwardly of the liquid chamber and also outwardly of the operating chamber.
  • the spring abutment means 19 is mounted on the centre part 14 of the diaphragm 4 and extends through an airtight seal in the outer wall of the housing 2. Positioning of the spring 16 in the operating chamber would increase dead space when the operating medium is a gaseous medium.
  • the operating medium may be a liquid medium, for instance oil.
  • the function of the spring element may also be achieved with the aid of a piston-cylinder device that is pressurised at the same time as air is evacuated from a corresponding operating chamber.
  • Fig. 3 illustrates the following features:
  • a venturi-configured constriction 24 which is preferably provided with a diffuseT and in which the velocity of the liquid is maintained at such a high magnitude as to cause cavitation in the constriction. (A sharp-edge constriction will result in much higher energy losses.) Constant flows are achieved even if the resistance downstream of the constriction changes, provided that cavitation prevails.
  • the pump outlet conduit may also be provided with a so-called manifold 23 which distributes the liquid to several, parallel conduits each having a cavitation-generatmg constriction so that a constant flow will be obtained in each conduit.
  • This arrangement can be used in conjunction with metering liquid volumes into packages when valves 25 in each conduit open and close at precise, adjustable times, these opening and closing times being controlled from the electronic control unit 22 which also controls the pump.
  • the discharged volumes can be repeated precisely, since said volume is held constant m this way.
  • the volume will remain constant even if the pressure n the conduits is changed downstream of the cavitation-generatmg restriction, provided that cavitation is maintained in said conduits.
  • the filling volume and the flow will also remain constant in the event of changes in the viscosity of the liquid.
  • Liquid can also be sucked into the pump working chambers without the assistance of resilient elements or like spring means, simply by forcing liquid into the pump at an overpressure which is lower than the pressure imparted to the liquid in said working chambers by the operating chambers of said pump.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)

Abstract

Pompe à double action comprenant deux chambres divisées chacun en une chambre opérationnelle (6) et une chambre de travail (5) au moyen d'une cloison mobile (4) sous forme de piston ou de membrane, chacune desdites chambres comportant une entrée et une sortie commandées par un clapet (7, 9; 8, 9) et assurant le passage d'un milieu gazeux et d'un milieu liquide de travail véhiculés respectivement par la pompe, lesdites cloisons de séparation étant dépourvues de toute forme d'accouplement mécanique intermédiaire. Un conduit de sortie (23) présente un étranglement (24) produisant une cavitation. On peut mettre cette pompe en service de façon à conserver la cavitation dans l'étranglement (24) quand le liquide de travail passe à travers ledit conduit de sortie.
PCT/SE1999/001571 1998-09-10 1999-09-09 Pompe a double action WO2000015962A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU62361/99A AU6236199A (en) 1998-09-10 1999-09-09 Double-acting pump
EP99949506A EP1112449A1 (fr) 1998-09-10 1999-09-09 Pompe a double action

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9803074A SE514807C2 (sv) 1998-09-10 1998-09-10 Dubbelverkande membranpump för konstant tryck och flöde
SE9803074-5 1998-09-10

Publications (1)

Publication Number Publication Date
WO2000015962A1 true WO2000015962A1 (fr) 2000-03-23

Family

ID=20412555

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1999/001571 WO2000015962A1 (fr) 1998-09-10 1999-09-09 Pompe a double action

Country Status (4)

Country Link
EP (1) EP1112449A1 (fr)
AU (1) AU6236199A (fr)
SE (1) SE514807C2 (fr)
WO (1) WO2000015962A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1152149A2 (fr) * 2000-05-01 2001-11-07 Advance Denki Kougyou Kabushiki Kaisha Pompe à membrane double
WO2011140089A2 (fr) * 2010-05-03 2011-11-10 Kickstart International, Inc. Pompe souterraine à double action
US8770954B2 (en) 2010-02-10 2014-07-08 KickSmart International, Inc. Human-powered irrigation pump
US9383094B2 (en) 2012-06-25 2016-07-05 Orbital Atk, Inc. Fracturing apparatus
US10288060B2 (en) 2008-12-19 2019-05-14 Stobbe Pharma Tech Gmbh Electronically controlled diaphragm pump
CN111237150A (zh) * 2020-01-18 2020-06-05 浙江启尔机电技术有限公司 一种柔性联动往复泵

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106979149B (zh) * 2017-03-09 2018-10-26 同济大学 模拟常规柱塞泵运动规律及空化现象的可视化实验装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4093403A (en) * 1976-09-15 1978-06-06 Outboard Marine Corporation Multistage fluid-actuated diaphragm pump with amplified suction capability
EP0304210A2 (fr) * 1987-08-17 1989-02-22 The Aro Corporation Pompe à double membrane
DE19511677A1 (de) * 1995-03-16 1996-09-19 Abel Gmbh & Co Membrankolbenpumpe

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4093403A (en) * 1976-09-15 1978-06-06 Outboard Marine Corporation Multistage fluid-actuated diaphragm pump with amplified suction capability
EP0304210A2 (fr) * 1987-08-17 1989-02-22 The Aro Corporation Pompe à double membrane
DE19511677A1 (de) * 1995-03-16 1996-09-19 Abel Gmbh & Co Membrankolbenpumpe

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1152149A2 (fr) * 2000-05-01 2001-11-07 Advance Denki Kougyou Kabushiki Kaisha Pompe à membrane double
EP1152149A3 (fr) * 2000-05-01 2003-06-04 Advance Denki Kougyou Kabushiki Kaisha Pompe à membrane double
US10288060B2 (en) 2008-12-19 2019-05-14 Stobbe Pharma Tech Gmbh Electronically controlled diaphragm pump
US10508647B2 (en) 2008-12-19 2019-12-17 Stobbe Pharma Tech Gmbh Electronically controlled diaphragm pump
US8770954B2 (en) 2010-02-10 2014-07-08 KickSmart International, Inc. Human-powered irrigation pump
US10100818B2 (en) 2010-02-10 2018-10-16 Kickstart International, Inc. Human powered irrigation pump
WO2011140089A2 (fr) * 2010-05-03 2011-11-10 Kickstart International, Inc. Pompe souterraine à double action
WO2011140089A3 (fr) * 2010-05-03 2012-04-05 Kickstart International, Inc. Pompe souterraine à double action
US9383094B2 (en) 2012-06-25 2016-07-05 Orbital Atk, Inc. Fracturing apparatus
CN111237150A (zh) * 2020-01-18 2020-06-05 浙江启尔机电技术有限公司 一种柔性联动往复泵
CN111237150B (zh) * 2020-01-18 2022-06-14 浙江启尔机电技术有限公司 一种柔性联动往复泵

Also Published As

Publication number Publication date
EP1112449A1 (fr) 2001-07-04
SE514807C2 (sv) 2001-04-30
SE9803074L (sv) 2000-03-11
SE9803074D0 (sv) 1998-09-10
AU6236199A (en) 2000-04-03

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