US3327633A - Dosing pump operating in opposite phases for dosing liquid or gaseous media - Google Patents

Dosing pump operating in opposite phases for dosing liquid or gaseous media Download PDF

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Publication number
US3327633A
US3327633A US432139A US43213965A US3327633A US 3327633 A US3327633 A US 3327633A US 432139 A US432139 A US 432139A US 43213965 A US43213965 A US 43213965A US 3327633 A US3327633 A US 3327633A
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US
United States
Prior art keywords
pistons
dosing
chamber
housing
pump
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
US432139A
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English (en)
Inventor
Duinker Simon
Gossel Dieter
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.)
US Philips Corp
North American Philips Co Inc
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US Philips Corp
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Publication of US3327633A publication Critical patent/US3327633A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K33/00—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
    • H02K33/12—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with armatures moving in alternate directions by alternate energisation of two coil systems
    • 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
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
    • F04B17/04—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids
    • F04B17/042—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids the solenoid motor being separated from the fluid flow
    • 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
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/04—Measures to avoid lubricant contaminating the pumped fluid
    • F04B39/041—Measures to avoid lubricant contaminating the pumped fluid sealing for a reciprocating rod
    • F04B39/044—Measures to avoid lubricant contaminating the pumped fluid sealing for a reciprocating rod sealing with a rolling diaphragm between piston and cylinder
    • 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
    • F04B43/025—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms two or more plate-like pumping members in parallel
    • F04B43/026—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms two or more plate-like pumping members in parallel each plate-like pumping flexible member working in its own pumping chamber
    • 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
    • F04B43/04—Pumps having electric drive
    • 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
    • F04B5/00—Machines or pumps with differential-surface pistons
    • F04B5/02—Machines or pumps with differential-surface pistons with double-acting pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/50—Sealings between relatively-movable members, by means of a sealing without relatively-moving surfaces, e.g. fluid-tight sealings for transmitting motion through a wall
    • F16J15/52—Sealings between relatively-movable members, by means of a sealing without relatively-moving surfaces, e.g. fluid-tight sealings for transmitting motion through a wall by means of sealing bellows or diaphragms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J3/00—Diaphragms; Bellows; Bellows pistons
    • F16J3/06—Bellows pistons

Definitions

  • the invention relates to a dosing pump operating in opposite phases for dosing liquid or gaseous media with displacers, which are sealed with respect to the housing of the pump by means of flexible diaphragms, which are supported, on the side remote from the operating space, by an incompressible medium.
  • Piston-dosing pumps have a large stroke volume and an associated large delivery. This large stroke volume and the associated large delivery are based on a favorable ratio of the stroke volume to the so-called dead space.
  • the name dead space is given to that part of the cylinder contents which is not reached by the piston during its movement and which is consequently not emptied during a stroke. Therefore, the displacing stroke only depends on the pressure to a small extent.
  • the medium to be pumped comes in contact ,with the sealing parts of the piston and the stufiing boxes.
  • Diaphragm dosing pumps are used when, usually as a result of the properties of the medium to be dosed, a
  • the stroke is obtained by flexible deformation of the diaphragm, the tension increasing with the stroke.
  • the ratio of the stroke .volume to the dead space becomes unfavorable.
  • the accuracy is no better than that of piston pumps.
  • the delivery is only low in relation to the size of the pumps.
  • rolling diaphragms In compressors it is known to seal the compression chamber by means of flexible diaphragms, so-called rolling diaphragms.
  • the rolling diaphragms are either forced against the wall of the housing only in which they engage a movable piston in the shape of a flattened hose, or they are connected in the housing and to the piston. During the strokes of the piston the diaphragm rolls along with the piston.
  • the hollow space below the diaphragm is in addition filled with an incompressible liquid.
  • the dosing pump according to the invention operate in opposite phases distinguishes from the known pumps in that with long stroke and small dead space no leakage losses occur in this pump.
  • a small migration of the medium from the sealing space of one cylinder to the sealing space of the other is compensated by an equally large opposite migration during a movement of the piston in the opposite direction, so that thereby no error can occur.
  • the load of the rolling diaphragms in the pump according to the invention is extremely small because these diaphragms are mainly uncoiled only and thereby subjected to very small flexible loads only. Moreover, the load of the diaphragm is entirely independent of the extent of the stroke.
  • the life of the diaphragms in the pump according to the invention increases.
  • a life is stated of 4500 hours at 108 strokes per minute, which corresponds to approximately 3 10 strokes totally
  • the pump according to the invention with rolling diaphragms still operates excellently after more than 10,000 operating hours at 1500 strokes per minute, which corresponds to 9X10 strokes totally and a length of stroke of 65 mm.
  • the life of the rolling diaphragm in the pump according to the invention consequently is at least 30 times as large as the life of the diaphragm in a diaphragm dosing pump of the conventional construction.
  • the dosing pump according to the invention is preferably driven electromagnetically.
  • the pistons with the sliding member connecting them as well as the sliding bearing and movable stop members for varying the volume of the stroke consist of a magnetically readily conducting material, whereas the remaining parts of the pump are manufactured from magnetically poorly conducting material.
  • the pistons in the dosing pump according to the invention are reciprocated through energizing coils which are provided on iron yokes which connect the bearing and the stop members by means of the field forces, which are the result of the currents flowing through the energizing coils. In this manner any mechanical connection between the operating chambers for the pistons and the surroundings is lacking so that the problems involved in stufiing boxes are omitted.
  • FIG. 1 diagrammatica lly shows an embodiment of an electromagnetically driven dosing pump according to the invention operating in opposite phases, the piston being in the lowermost final condition.
  • FIG. 2 shows the pump according to FIG. 1, the piston being in the uppermost final position.
  • FIG. 3 shows the pump according to FIG. 1 with a stroke reduced by a stop member.
  • FIG. 4 diagrammatically shows the electromagnetic drive of the pump according to the invention for operation which is independent of the direction of current.
  • FIG. 5 shows an electromagnetic drive for operation which is dependent upon the direction of current.
  • the dosing pump which operates in opposite directions consists of a housing 1 comprising a sliding bearing 3 for a piston 5 which consists of a sliding member 7 and two oppositely located pistons 9 provided on the sliding member 7.
  • the piston is guided in the sliding bearing 3 and is capable of displacing gaseous or liquid media contained in cylinders 11 which are located on both sides of the sliding bearing.
  • Rolling diaphragms 15 are attached to the end faces 13- of the pistons. In addition these rolling diaphragms engage the cylinder walls 17 approximately at half of the length of stroke.
  • the sealing chambers 19 between the rolling diaphragms 15 are filled with an incompressible liquid. They are substantially equal at any position of the stroke of the piston 5. This is reached in that the pistons have a reduced diameter over parts of their cross-section, which parts can be moved exactly up to the sliding bearing 3 during the stroke movements, in which the cylinders, preferably also up to the sliding bearing, have a diameter which is larger than the cross-section of the sliding bearing so that the formed annular surfaces are equal to one another.
  • the volumes of the chambers 11 of the cylinders can be adjusted by means of stop members 21.
  • one of the stop members 21 is screwed into a cylinder chamber 11 through a given distance.
  • the medium to be displaced flows through the chambers 11 through a feed-pipe 23 provided on the housing of the pump and through pipes 25 joining this feed pipe.
  • the medium to be displaced is conducted away from the upper or lower chamber 11 through pipe 27 and a-n outlet pipe 29.
  • Check valves 31 in the pipes 25 and 27 ensure that the displaced medium cannot flow back erroneously.
  • the spaces 33 in the pump according to the invention are extremely small since the end faces of the pistons engage the stop member 21 provided in the housing of the pump 1 and only annular spaces remain which the rolling diaphragms leave as a result of their construction.
  • the piston construction is operated electromagnetically.
  • the stop members 21, the sliding bearing 3 and the piston 5 are manufactured from magnetically conducting material.
  • the sliding bearing and the stop members are connected together by means of soft magnetic iron yokes 35 (FIG. 4.).
  • a material for the yokes is to be considered iron or ferrite.
  • Energizing coils 37, 38 are connected to the yokes 35 and are provided with a current by a voltage source 41, at choice and alternately, by means of a switch 39. In accordance with the position of the switch 39 the current from the direct voltage or alternating voltage source 41 flows through the winding 37 or through the winding 38. Since the magnetic forces in this case are so operative that they try to reduce the magnetic resistance in the circuit energized at that instant, independent of the direction of the magnetic field, the piston construction 5 is attracted by one or by the other pole shoe 21.
  • the piston construction 5 is magnetized.
  • one end face of the piston has a magnetic south pole 43 and the other end face of the piston has a magnetic north pole 45.
  • a direct current source 47 By reversing the polarities of the windings 37 and 38 fed by a direct current source 47 by means of a switch 49, the direction of the driving force acting upon the piston construction 5 is varied.
  • the windings 37 and 38 may also be supplied directly from a current source with alternating polarity.
  • alternating current or pulse current sources are to be considered.
  • the delivery is determined by the frequency of the supply source. This is particularly favorable for dosing devices in which it must be possible to vary the delivery during operation.
  • a pump operating in opposite directions for supplying liquid or gaseous media, said pump having a pair of axially spaced pistons, a housing for said pistons, flexible diaphragms connecting said pistons to said housing, an operating chamber for each of said pistons, an incompressible medium supporting each of said flexible diaphragms on a side thereof remote from said operating chamber to form an annular sealing chamber wherein the improvement comprises a sliding member journalled in said housing and connecting said pistons, said flexible diaphragms separating said operating chambers and each being connected on one end to the adjacent end face of said piston and at the other end to the adjacent housing wall, said pistons having a reduced diameter with respect to said sliding member, said slidable member when operative entering said sealing chamber to thereby displace said medium in an amount equal to the change in the configuration of said chamber whereby the net volume of said chamber remains constant.
  • a pump as claimed in claim 1 further comprising a sleeve-like bearing in said housing, said sliding member being rectil-inearly movable therein, and said sliding member and piston being circular in cross-section and movable in said annular sealing chamber.
  • a pump as claimed in claim 1 further comprising movable stop members which are adapted to vary the volumes of their respective operating chambers; said movable stop members and sliding member being constituted of magnetically conducting material, and further comprising a magnetic yoke connecting said stop members and said sliding member together, and means for providing an electrical current to said yoke whereby said pistons are magnetized and are selectively moved.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Reciprocating Pumps (AREA)
US432139A 1964-03-07 1965-02-12 Dosing pump operating in opposite phases for dosing liquid or gaseous media Expired - Lifetime US3327633A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1964P0033785 DE1453610B2 (de) 1964-03-07 1964-03-07 Gegentakt-dosierpumpe zum dosieren von fluessigen oder gasfoermigen medien

Publications (1)

Publication Number Publication Date
US3327633A true US3327633A (en) 1967-06-27

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Application Number Title Priority Date Filing Date
US432139A Expired - Lifetime US3327633A (en) 1964-03-07 1965-02-12 Dosing pump operating in opposite phases for dosing liquid or gaseous media

Country Status (5)

Country Link
US (1) US3327633A (de)
DE (1) DE1453610B2 (de)
FR (1) FR1426572A (de)
GB (1) GB1097715A (de)
NL (1) NL6502583A (de)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3488763A (en) * 1968-02-16 1970-01-06 Alden A Lofquist Jr Rolling seal pump
FR2050440A1 (en) * 1969-07-02 1971-04-02 Daref Gmbh Kunststoff Piston operated sampling and dosage device
US4036112A (en) * 1974-07-02 1977-07-19 Motoren-Werke Mannheim Ag Rolling diaphragm sealing devices
US4131398A (en) * 1975-11-24 1978-12-26 Onofrio Rocchitelli Glass washing electromagnetic pump, more particularly for windscreens of motor vehicles
EP0001463A1 (de) * 1977-09-22 1979-04-18 Augustinus Johannes Petrus Maria Van Boxtel Kolbenpumpe
US4191514A (en) * 1977-06-13 1980-03-04 Ely Richard H Pumping arrangements to conserve energy
US4468177A (en) * 1981-04-27 1984-08-28 Strimling Walter E Diaphragm pump arrangement in which alternately expanded and contracted chambers are used independently
US4725207A (en) * 1985-02-21 1988-02-16 Regents Of The University Of Minnesota Automated peritoneovenous shunt
US5152671A (en) * 1989-03-30 1992-10-06 Infus Hospitalbedarf Gmbh & Co. Vertriebs Kg Haemodialysis process
US5725365A (en) * 1995-12-12 1998-03-10 Solomon; Fred D. Rolling diaphragm seal arrangement for a submersible pump system
US6517329B2 (en) * 1998-10-28 2003-02-11 Nitto Kohki Co., Ltd. Electromagnetic blower and two-passage air supply apparatus
JP2012529597A (ja) * 2009-06-09 2012-11-22 ダブリュ． ヒーリー、ジェイムズ 波エネルギ発電
CN103498780A (zh) * 2013-10-18 2014-01-08 钟小玉 一种改良结构的单缸双作用往复式活塞泵
EP2712601A1 (de) * 2012-09-26 2014-04-02 Obotics Inc. Fluidische Verfahren und Vorrichtungen
US9068554B2 (en) 2009-06-09 2015-06-30 James W. Healy Wave energy electrical power generation
EP2456977A4 (de) * 2009-07-22 2017-03-15 Vbox Incorporated Verfahren zur steuerung einer pumpe für ein gasförmiges fluid
CN107288858A (zh) * 2017-08-07 2017-10-24 常州柏繁电气有限公司 一种净水机用隔膜泵
US20170335832A1 (en) * 2014-12-18 2017-11-23 Ge Healthcare Bio-Sciences Ab Pump System for Inline Conditioning
EP3318758A1 (de) * 2016-11-08 2018-05-09 Lutz Holding GmbH Doppelmembranpumpe sowie verfahren zum betrieb einer solchen doppelmembranpumpe
WO2020038639A1 (de) * 2018-08-20 2020-02-27 Robert Bosch Gmbh Pumpenanordnung

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2701525B1 (fr) * 1993-02-12 1995-04-21 Hutchinson Perfectionnements aux dispositifs antivibratoires hydrauliques.

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2191861A (en) * 1939-01-12 1940-02-27 Theodore R Rymal Pump
US2342906A (en) * 1941-04-01 1944-02-29 Cecil W Smith Pump
US2576747A (en) * 1946-01-24 1951-11-27 Austin U Bryant Liquid dispenser with means to vary a measured discharge
US2686280A (en) * 1949-10-25 1954-08-10 Herbert W Strong Electromagnetic piston pump
US2943577A (en) * 1957-09-16 1960-07-05 Woodrow F Barker Pump
US2952218A (en) * 1958-09-09 1960-09-13 Adam P G Steffes Pump
US3099260A (en) * 1960-02-09 1963-07-30 Davol Rubber Co Heart pump apparatus
US3134938A (en) * 1962-07-05 1964-05-26 Exxon Research Engineering Co Reciprocating motor control system
US3204858A (en) * 1962-07-10 1965-09-07 Philips Corp Piston cylinder means with fluid-coupled drive means and rolling diaphragm seal
US3227093A (en) * 1964-02-03 1966-01-04 John F Taplin Piston pump having rolling diaphragm

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2191861A (en) * 1939-01-12 1940-02-27 Theodore R Rymal Pump
US2342906A (en) * 1941-04-01 1944-02-29 Cecil W Smith Pump
US2576747A (en) * 1946-01-24 1951-11-27 Austin U Bryant Liquid dispenser with means to vary a measured discharge
US2686280A (en) * 1949-10-25 1954-08-10 Herbert W Strong Electromagnetic piston pump
US2943577A (en) * 1957-09-16 1960-07-05 Woodrow F Barker Pump
US2952218A (en) * 1958-09-09 1960-09-13 Adam P G Steffes Pump
US3099260A (en) * 1960-02-09 1963-07-30 Davol Rubber Co Heart pump apparatus
US3134938A (en) * 1962-07-05 1964-05-26 Exxon Research Engineering Co Reciprocating motor control system
US3204858A (en) * 1962-07-10 1965-09-07 Philips Corp Piston cylinder means with fluid-coupled drive means and rolling diaphragm seal
US3227093A (en) * 1964-02-03 1966-01-04 John F Taplin Piston pump having rolling diaphragm

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3488763A (en) * 1968-02-16 1970-01-06 Alden A Lofquist Jr Rolling seal pump
FR2050440A1 (en) * 1969-07-02 1971-04-02 Daref Gmbh Kunststoff Piston operated sampling and dosage device
US4036112A (en) * 1974-07-02 1977-07-19 Motoren-Werke Mannheim Ag Rolling diaphragm sealing devices
US4131398A (en) * 1975-11-24 1978-12-26 Onofrio Rocchitelli Glass washing electromagnetic pump, more particularly for windscreens of motor vehicles
US4191514A (en) * 1977-06-13 1980-03-04 Ely Richard H Pumping arrangements to conserve energy
EP0001463A1 (de) * 1977-09-22 1979-04-18 Augustinus Johannes Petrus Maria Van Boxtel Kolbenpumpe
US4468177A (en) * 1981-04-27 1984-08-28 Strimling Walter E Diaphragm pump arrangement in which alternately expanded and contracted chambers are used independently
US4725207A (en) * 1985-02-21 1988-02-16 Regents Of The University Of Minnesota Automated peritoneovenous shunt
US5152671A (en) * 1989-03-30 1992-10-06 Infus Hospitalbedarf Gmbh & Co. Vertriebs Kg Haemodialysis process
US5725365A (en) * 1995-12-12 1998-03-10 Solomon; Fred D. Rolling diaphragm seal arrangement for a submersible pump system
US6517329B2 (en) * 1998-10-28 2003-02-11 Nitto Kohki Co., Ltd. Electromagnetic blower and two-passage air supply apparatus
JP2012529597A (ja) * 2009-06-09 2012-11-22 ダブリュ． ヒーリー、ジェイムズ 波エネルギ発電
US8963352B2 (en) 2009-06-09 2015-02-24 James W. Healy Wave energy electrical power generation
US9068554B2 (en) 2009-06-09 2015-06-30 James W. Healy Wave energy electrical power generation
EP2456977A4 (de) * 2009-07-22 2017-03-15 Vbox Incorporated Verfahren zur steuerung einer pumpe für ein gasförmiges fluid
US9695806B2 (en) 2009-07-22 2017-07-04 Vbox, Incorporated Method of controlling gaseous fluid pump
EP2712601A1 (de) * 2012-09-26 2014-04-02 Obotics Inc. Fluidische Verfahren und Vorrichtungen
US9498404B2 (en) 2012-09-26 2016-11-22 Obotics Inc. Fluidic methods and devices
US10527030B2 (en) 2012-09-26 2020-01-07 Obotics Inc. Fluidic methods and devices
CN103498780B (zh) * 2013-10-18 2016-04-06 钟小玉 一种改良结构的单缸双作用往复式活塞泵
CN103498780A (zh) * 2013-10-18 2014-01-08 钟小玉 一种改良结构的单缸双作用往复式活塞泵
US20170335832A1 (en) * 2014-12-18 2017-11-23 Ge Healthcare Bio-Sciences Ab Pump System for Inline Conditioning
EP3318758A1 (de) * 2016-11-08 2018-05-09 Lutz Holding GmbH Doppelmembranpumpe sowie verfahren zum betrieb einer solchen doppelmembranpumpe
US10662937B2 (en) 2016-11-08 2020-05-26 Lutz Holding GmbH Double-membrane pump and method for operation of such a double-membrane pump
CN107288858A (zh) * 2017-08-07 2017-10-24 常州柏繁电气有限公司 一种净水机用隔膜泵
WO2020038639A1 (de) * 2018-08-20 2020-02-27 Robert Bosch Gmbh Pumpenanordnung

Also Published As

Publication number Publication date
NL6502583A (de) 1965-09-08
FR1426572A (fr) 1966-01-28
DE1453610B2 (de) 1972-06-29
DE1453610A1 (de) 1969-07-31
GB1097715A (en) 1968-01-03

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