US20170198689A1 - Displacement pump with fluid reservoir - Google Patents

Displacement pump with fluid reservoir Download PDF

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Publication number
US20170198689A1
US20170198689A1 US15/320,777 US201515320777A US2017198689A1 US 20170198689 A1 US20170198689 A1 US 20170198689A1 US 201515320777 A US201515320777 A US 201515320777A US 2017198689 A1 US2017198689 A1 US 2017198689A1
Authority
US
United States
Prior art keywords
pressure
valve
delivery chamber
displacement pump
suction
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.)
Abandoned
Application number
US15/320,777
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English (en)
Inventor
Maximilian Bechtler
Holger Ludwig
Michael Rummer
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.)
Prominent GmbH
Original Assignee
Prominent 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 Prominent GmbH filed Critical Prominent GmbH
Assigned to PROMINENT GMBH reassignment PROMINENT GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BECHTLER, Maximilian, LUDWIG, HOLGER, RUMMER, Michael
Publication of US20170198689A1 publication Critical patent/US20170198689A1/en
Abandoned 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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/06—Venting
    • 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
    • F04B13/00—Pumps specially modified to deliver fixed or variable measured quantities
    • 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
    • F04B23/00—Pumping installations or systems
    • F04B23/02—Pumping installations or systems having reservoirs
    • 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
    • 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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2210/00—Working fluid
    • F05B2210/10—Kind or type
    • F05B2210/11—Kind or type liquid, i.e. incompressible
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S417/00—Pumps

Definitions

  • the present invention concerns a displacement pump having a delivery chamber connected to a pressure and a suction connection.
  • the displacement pump further has a displacer element which determines the volume of the delivery chamber and which can be reciprocated between a first position in which the delivery chamber is of a smaller volume and a second position in which the delivery chamber is of a larger volume.
  • the pressure connection is connected to the delivery chamber by way of a pressure valve in the form of a non-return valve and the suction connection is connected to the delivery chamber by way of a suction valve which is also in the form of a non-return valve.
  • the displacer element which for example can be a diaphragm is reciprocated oscillatingly between the first and second positions.
  • the so-called suction stroke movement the volume of the delivery chamber is increased whereby the pressure in the delivery chamber drops.
  • the suction valve opens and medium to be delivered is sucked into the delivery chamber by way of the suction connection.
  • the displacer element moves from the second position in the direction of the first position again (this is the so-called pressure stroke movement) the volume in the delivery chamber decreases and the pressure in the delivery chamber rises.
  • the suction valve is closed to prevent a backflow of the medium to be delivered, into the suction line. As soon as the pressure in the delivery chamber exceeds the pressure in a pressure line connected to the pressure connection the pressure valve is opened so that the delivery medium in the delivery chamber can be pushed into the pressure line.
  • metering liquids in particular outgassing delivery media like for example sodium hypochlorite (NaOCl) gas bubbles can be formed in the suction line which is connected to the suction connection, and sucked into the metering head. It is also possible for gas bubbles to be formed in the delivery chamber. That is frequently the case after prolonged breaks in the metering process.
  • the suction connection is connected to a suction line which in the simplest case is in the form of a hose and ends in a supply container it can happen when changing the supply container, in particular with the pump running, that the suction line is briefly no longer connected to the delivery medium and sucks in gas.
  • the displacer element no longer succeeds in applying a sufficiently high pressure to open the pressure valve the delivery medium is not pumped, that is to say the desired metering operation cannot take place.
  • the pressure valve is of a non-tight structure so that even when the pressure valve is closed a return flow passage interconnects the delivery chamber and the pressure connection, through which medium can pass into the delivery chamber and/or gas can escape from the delivery chamber.
  • That structure however suffers from the disadvantage that the delivery characteristic depends on the pressure in the pressure line connected to the pressure connection. Particularly if pumping is to be effected against a very high pressure the amount of delivery fluid which flows back into the delivery chamber through the non-tight pressure valve markedly increases so that the metering efficiency is reduced.
  • the object of the present invention is to provide a displacement pump which is self-venting, which is of a simple structure and which in addition has a pressure-stable metering capacity even when there are high counteracting pressures in the pressure line.
  • a reservoir which can be filled with delivery fluid is connected to the delivery chamber by way of a gas venting valve.
  • reservoir is used to denote any cavity which can be filled with delivery fluid and which is possibly separated by way of valves both from the delivery chamber and also from the pressure and suction connections.
  • the gas venting valve is so designed that it can be opened or opens automatically during the suction stroke movement at least whenever there is too much gas in the delivery chamber whereby delivery fluid is transferred from the reservoir into the delivery chamber and consequently the pressure in the delivery chamber rises further during the next pressure stroke movement.
  • delivery fluid can again be passed from the reservoir into the delivery chamber so that the pressure in the delivery chamber rises further during the pressure stroke movement. That can be continued until pressure sufficiently builds up again in the delivery chamber to open the pressure valve so that the delivery fluid, possibly together with gaseous constituents, is pumped into the pressure line.
  • the displacement pump is preferably of such a design configuration that delivery fluid can be transported from the suction connection by way of the suction valve into the delivery chamber without flowing through the reservoir. It is then possible during the suction stroke movement to pass liquid to be delivered into the delivery chamber even when the pressure drop is not sufficient to open the suction valve.
  • the gas venting valve in the direction from the reservoir to the delivery chamber has a through-flow coefficient which is less than the through-flow coefficient of the suction valve.
  • the through-flow coefficient of the gas venting valve can be less than 1%, or preferably even less than 0.2%, of the through-flow coefficient of the suction valve.
  • the through-flow coefficient is a measurement in respect of the achievable throughput of the delivery fluid for the valve in question and in principle is also a measurement in respect of the effective cross-section.
  • the absolute value of the through-flow coefficient is not an important consideration, but only the ratio of the through-flow coefficient of the gas venting valve to that of the suction or pressure valve.
  • the effective cross-section of the gas venting valve is less than 1% and preferably even less than 0.2% of the effective cross-section of the suction valve.
  • the delivery fluid through-flow of the valve (ml/min) can be defined as the definition of the through-flow coefficient, at a pressure difference of 1 bar and at a delivery fluid temperature of 25° C.
  • the through-flow is in that case respectively defined with the valve opened.
  • the gas venting valve By the corresponding reduction in the through-flow coefficient of the gas venting valve same can be opened even when there is no gas in the delivery chamber so that detection of the amount of gas is not absolutely necessary.
  • a quantity of delivery fluid flows out of the reservoir into the delivery chamber, and that leads to venting of gas from the delivery chamber.
  • delivery fluid is also taken from the reservoir so that the reservoir has to be filled up again.
  • this reduces the delivery capacity as less fluid is sucked in by way of the suction connection and pumped into the pressure line by way of the pressure connection.
  • the pressure capacity however is only minimally reduced due to the great reduction in the through-flow coefficient.
  • the gas venting valve can also always be opened or can comprise a suitably sized throttle.
  • the gas venting valve is in the form of a throttle non-return valve which provides a permanent throttled communication and if the pressure in the delivery chamber is greater than the pressure in the reservoir an unthrottled communication. That measure provides that the reservoir can also be filled with delivery fluid again when the delivery chamber is vented as then a part of the delivery fluid is pumped into the reservoir.
  • the throttle non-return valve has a through-flow coefficient which is less than the through-flow coefficient of the pressure valve, wherein preferably the through-flow coefficient of the unthrottled gas venting valve is less than 15%, particularly preferably less than 5%, of the through-flow coefficient of the pressure valve.
  • That measure ensures that only a small part of the delivery fluid in the delivery chamber is pumped into the reservoir and the greater proportion of the delivery fluid is transported into the pressure line.
  • the gas venting valve is a non-return valve which opens when the pressure in the delivery chamber is less than the pressure in the reservoir.
  • the embodiment with a non-return valve is advantageous if the pressure in the reservoir is greater than the pressure in the suction line as then during the suction stroke movement fluid can be taken from the reservoir, even if the pressure in the delivery chamber does not drop below the pressure in the suction line.
  • the reservoir is connected to the pressure connection.
  • the gas venting valve it is particularly preferred for the gas venting valve to be connected in series with the pressure valve, with the gas venting valve being arranged closer to the delivery chamber.
  • delivery fluid which is pumped from the delivery chamber into the pressure line must flow firstly through the gas venting valve and thereafter the pressure valve.
  • the reservoir is then formed by the connecting line between the gas venting valve on the one hand and the pressure valve on the other hand.
  • the reservoir is connected to an accumulator.
  • An accumulator or also a hydraulic storage means stores the liquid, that is to say the delivery fluid, under pressure.
  • such an accumulator can be formed by a pressure vessel whose internal space is subdivided into two chambers by a moveable separating member, wherein a gas which serves as a pressure storage means is kept in the one chamber and the delivery fluid in the other chamber.
  • the displacement pump can be used in a metering installation having a pressure line in which delivery fluid is contained at a pressure p 2 and a suction line in which delivery fluid is contained at a pressure p 1 ⁇ p 2 , wherein the pressure line is connected to the pressure connection and the suction line to the suction connection.
  • the delivery fluid in the reservoir is under a pressure p 3 , wherein p 1 ⁇ p 3 ⁇ p 2 .
  • This embodiment has the advantage that, when there is too much gas in the delivery chamber and therefore no delivery medium is pumped by way of the pressure valve into the pressure line and even at the end of the suction stroke movement no further delivery fluid is sucked by way of the suction line and the suction valve into the delivery chamber, instead of that during the suction stroke movement delivery fluid is introduced from the reservoir into the delivery chamber by way of the gas venting valve, with the consequence that the pressure in the delivery chamber rises in the next pressure stroke movement.
  • FIG. 1 shows a diagrammatic view of a preferred embodiment.
  • FIG. 1 diagrammatically shows a metering installation having a displacement pump.
  • the metering installation serves to pump a delivery fluid from a suction line 1 in which delivery fluid is contained at the fluid pressure p 1 into a pressure line 6 in which delivery fluid is under a fluid pressure p 2 , wherein p 2 >p 1 .
  • the displacement pump has a delivery chamber 3 in which a displacer element 11 in the form of a diaphragm can be reciprocated between two positions, wherein the delivery chamber is of a smaller volume in the first position which is shown in broken line in the Figure and identified by reference 4 ′, and the delivery chamber is of a larger volume in the second position which is shown in solid line and is denoted by reference 4 .
  • the volume of the delivery chamber 3 thus increases and the pressure in the delivery chamber drops.
  • the suction valve 2 which is arranged between the suction line 1 and the delivery chamber 3 and which is in the form of a non-return valve opens.
  • the pressure in the delivery chamber 3 further rises until the pressure p 2 in the pressure line 6 is reached or exceeded. In that case the pressure valve 5 opens and delivery fluid is transported from the delivery chamber 3 into the pressure line 6 .
  • a reservoir 10 and a gas venting valve 7 are provided between the delivery chamber 3 and the pressure valve 5 which is also in the form of a non-return valve.
  • the reservoir 10 is formed by the communicating line between the gas venting valve 7 and the pressure valve 5 .
  • the gas venting valve 7 is in the form of a throttle non-return valve, that is to say it comprises a throttled connection 9 and a non-return valve 8 .
  • the gas venting valve 7 does not influence the mode of operation of the displacement pump.
  • the advantages of the arrangement according to the invention of the reservoir and the gas venting valve only become apparent when the delivery chamber 3 contains an excessively large proportion of gaseous constituents, which can happen in operation or after a prolonged stoppage.
  • this has the result that the movement of the diaphragm from the position 4 into the position 4 ′ is no longer sufficient to increase the pressure in the delivery chamber 3 to such an extent that the pressure p 2 is reached and the non-return valve 5 can be opened.
  • the diaphragm is reciprocated between the positions 4 and 4 ′, but there is neither opening of the suction valve 2 nor opening of the pressure valve 5 .
  • the pressure in the conveyor chamber 3 will fall during the suction stroke movement to such a degree that further delivery fluid is sucked out of the suction line 1 by way of the suction valve 2 .
  • This also leads to an increase in the pressure in the delivery chamber 3 at the end of the pressure stroke movement as now there is more delivery fluid in the delivery chamber 3 .
  • the pressure in the delivery chamber 3 will increase until the gas can be compressed to such an extent that it succeeds in opening the pressure valve 5 and urging the gas into the pressure line.
  • the gas venting valve 7 can be of precisely the same structure as described in WO 2013/135681 A1, that is to say it can have a valve member and a valve seat, between which even in the closed position there is a return flow passage formed for example by a groove.
  • the gas venting valve represents a non-tight non-return valve.
  • the described structure has the advantage that even when operating against a high pressure in the suction line 6 the metering capacity does not decrease as the pressure line 6 is not permanently in contact with the gas venting valve 7 . That is also advantageous from considerations relating to safety technology as, in the case of a diaphragm rupture, there is not a permanent connection between the metering line 6 on the one hand and delivery chamber 3 on the other hand.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)
US15/320,777 2014-09-05 2015-09-01 Displacement pump with fluid reservoir Abandoned US20170198689A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102014112833.8 2014-09-05
DE102014112833.8A DE102014112833A1 (de) 2014-09-05 2014-09-05 Verdrängerpumpe mit Fluidreservoir
PCT/EP2015/069933 WO2016034576A1 (de) 2014-09-05 2015-09-01 Verdrängerpumpe mit fluidreservoir

Publications (1)

Publication Number Publication Date
US20170198689A1 true US20170198689A1 (en) 2017-07-13

Family

ID=54072813

Family Applications (1)

Application Number Title Priority Date Filing Date
US15/320,777 Abandoned US20170198689A1 (en) 2014-09-05 2015-09-01 Displacement pump with fluid reservoir

Country Status (9)

Country Link
US (1) US20170198689A1 (ja)
EP (1) EP3189234B1 (ja)
JP (1) JP2017525884A (ja)
KR (1) KR20170052559A (ja)
CN (1) CN106795873B (ja)
BR (1) BR112017002095A2 (ja)
DE (1) DE102014112833A1 (ja)
SG (1) SG11201700200RA (ja)
WO (1) WO2016034576A1 (ja)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7232989B2 (ja) * 2019-09-11 2023-03-06 パナソニックＩｐマネジメント株式会社 洗濯機

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3762838A (en) * 1968-10-08 1973-10-02 R Sato Pumping system with circulating mechanism of bubble gas
US4776771A (en) * 1986-09-19 1988-10-11 Grunbeck Wasseraufbereitung Gmbh Metering pump
US5588809A (en) * 1992-12-05 1996-12-31 Lang Apparatebau Gmbh Metering pump with a vent valve
US6168390B1 (en) * 1997-03-22 2001-01-02 Henkel Kommanditgesellschaft Auf Aktien Dosing pump for dosed liquid conveyance
US20040062662A1 (en) * 2002-09-27 2004-04-01 Claude Cordell E. Effervescent gas bleeder apparatus
US20050019180A1 (en) * 2003-06-17 2005-01-27 Seiko Epson Corporation Pump
US6848408B1 (en) * 2002-07-23 2005-02-01 Edward Charles Mendler Intake port
US20120192956A1 (en) * 2010-08-13 2012-08-02 Gunther Weiszl Device for monitoring gas concentration and method using the device
JP2013015040A (ja) * 2011-07-01 2013-01-24 Tacmina Corp ポンプ及びポンプの運転方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3827489C1 (ja) * 1988-08-12 1989-10-12 Gruenbeck Wasseraufbereitung Gmbh, 8884 Hoechstaedt, De
MX339953B (es) * 2011-07-28 2016-06-20 Ecolab Inc Bomba de diafragma para la dosificacion de un fluido y metodo adecuado.
DE102012102088A1 (de) 2012-03-13 2013-09-19 Prominent Dosiertechnik Gmbh Verdrängerpumpe mit Zwangsentlüftung
CN202520500U (zh) * 2012-04-28 2012-11-07 浙江大学 一种超声波电机驱动的精密计量泵

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3762838A (en) * 1968-10-08 1973-10-02 R Sato Pumping system with circulating mechanism of bubble gas
US4776771A (en) * 1986-09-19 1988-10-11 Grunbeck Wasseraufbereitung Gmbh Metering pump
US5588809A (en) * 1992-12-05 1996-12-31 Lang Apparatebau Gmbh Metering pump with a vent valve
US6168390B1 (en) * 1997-03-22 2001-01-02 Henkel Kommanditgesellschaft Auf Aktien Dosing pump for dosed liquid conveyance
US6848408B1 (en) * 2002-07-23 2005-02-01 Edward Charles Mendler Intake port
US20040062662A1 (en) * 2002-09-27 2004-04-01 Claude Cordell E. Effervescent gas bleeder apparatus
US20050019180A1 (en) * 2003-06-17 2005-01-27 Seiko Epson Corporation Pump
US20120192956A1 (en) * 2010-08-13 2012-08-02 Gunther Weiszl Device for monitoring gas concentration and method using the device
JP2013015040A (ja) * 2011-07-01 2013-01-24 Tacmina Corp ポンプ及びポンプの運転方法
US20140119952A1 (en) * 2011-07-01 2014-05-01 Katsumi Adachi Pump and method for operating pump

Also Published As

Publication number Publication date
CN106795873B (zh) 2019-05-14
EP3189234A1 (de) 2017-07-12
WO2016034576A1 (de) 2016-03-10
EP3189234B1 (de) 2018-11-07
DE102014112833A1 (de) 2016-03-10
JP2017525884A (ja) 2017-09-07
SG11201700200RA (en) 2017-02-27
BR112017002095A2 (pt) 2017-11-21
CN106795873A (zh) 2017-05-31
KR20170052559A (ko) 2017-05-12

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