EP3189234A1 - Displacement pump with fluid reservoir - Google Patents
Displacement pump with fluid reservoirInfo
- Publication number
- EP3189234A1 EP3189234A1 EP15762528.6A EP15762528A EP3189234A1 EP 3189234 A1 EP3189234 A1 EP 3189234A1 EP 15762528 A EP15762528 A EP 15762528A EP 3189234 A1 EP3189234 A1 EP 3189234A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- valve
- delivery chamber
- suction
- reservoir
- 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
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
- 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 relates to a positive displacement pump with a delivery chamber, which is connected to a pressure and a suction port.
- the displacement pump furthermore has a displacement element which determines the volume of the delivery space and which is moved back and forth between a first position in which the delivery space has a smaller volume and a second position in which the delivery space has a larger volume can.
- the pressure connection is usually connected to the delivery chamber via a pressure valve designed as a check valve and the suction connection is connected to the delivery chamber via a suction valve which is likewise designed as a check valve.
- the displacer element which may for example be a membrane, oscillates between the first and the second position.
- the so-called suction stroke the volume of the delivery chamber is increased, as a result of which the pressure in the delivery chamber drops.
- the suction valve opens and via the suction connection the medium to be delivered is sucked into the delivery chamber.
- the displacement element moves back from the second position in the direction of the first position (this is the so-called pressure stroke)
- the volume in the delivery chamber decreases and the pressure in the delivery chamber increases.
- the suction valve is closed in order to prevent backflow of the pumped medium into the suction line.
- the pressure valve is opened so that the delivery medium located in the delivery chamber can be pressed into the delivery line.
- the dosing process may be disturbed, provided that the self-compression capability of the dosing head is insufficient to open the pressure valve against the return spring, the dead weight of the closing body and the system pressure due to the enclosed gas volume.
- the gas content in the pumping chamber becomes too high, despite the movement of the displacer from the second to the first position, the pressure in the pumping chamber is not increased sufficiently to open the pressure valve connected to the pressure port.
- the reason for this is the high compressibility of gas compared to liquids. If, therefore, it is no longer possible for the displacer element to apply a sufficiently high pressure to the opening of the pressure valve, the pumped medium is not pumped, i. the desired dosage can not be done.
- an additional connection between delivery chamber on the one hand and pressure port on the other hand is provided, which is opened intermittently to allow liquid re-entry from the pressure line into the pumping chamber, whereby gas can escape from the pumping chamber at the same time so that the ratio between compressible gases and incompressible liquids improves again and, ideally, the counter-pressure in the delivery chamber applied to the pressure connection can be reached again.
- this embodiment has the disadvantage that the delivery characteristic depends on the pressure in the pressure line connected to the pressure port. In particular, when it is to be pumped against a very high pressure, the amount of delivery fluid, which flows back through the leaking pressure valve in the delivery chamber, increases significantly, so that the dosing is reduced.
- this object is achieved in that a reservoir which can be filled with conveying fluid is connected to the delivery chamber via a degassing valve. Under a reservoir while any cavity is understood, which is filled with conveying fluid and is optionally separated via valves both from the pumping chamber and from the pressure and suction port.
- the degassing valve is designed such that it can be opened at least then during the suction stroke or automatically opens when too much gas in the pumping chamber, whereby conveying fluid is transferred from the reservoir into the pumping chamber and in the sequence during the next pressure stroke of the pressure in the delivery room continues to increase.
- the positive displacement pump is preferably designed such that conveying fluid from the suction port via the suction valve without flowing through the reservoir transported in the delivery chamber can be. Then it is possible during the suction stroke and then to conduct delivery liquid into the delivery chamber, if the pressure drop is insufficient to open the suction valve.
- the degassing valve in the direction from the reservoir to the delivery chamber has a flow coefficient which is smaller than the flow coefficient of the suction valve.
- the flow rate coefficient of the degassing valve may be less than 1% or, preferably, even less than 0.2% of the flow coefficient of the suction valve.
- the flow coefficient is a measure of the achievable throughput of the fluid through the valve in question and is in principle also a measure of the effective cross section.
- the absolute value of the flow coefficient does not matter, but only the ratio of the flow coefficient of the degassing valve to the flow coefficient of the suction or pressure valve.
- the effective cross section of the degassing valve is less than 1% and preferably even less than 0.2% of the effective cross section of the suction valve.
- the flow coefficient of the conveying fluid flow rate of the valve (ml / min) at a pressure difference of 1 bar and a delivery fluid temperature of 25 ° C can be defined.
- the flow rate is determined in each case with the valve open.
- this can also be opened when there is no gas in the pumping chamber, so that a detection of the amount of gas is not absolutely necessary.
- the degassing valve is opened, a quantity of conveying fluid flows from the reservoir into the delivery space, which leads to a degassing of the delivery space.
- delivery fluid is also removed from the reservoir so that it must be replenished.
- the degassing valve may also always be open or consist of a correspondingly sized throttle.
- the degassing valve is designed as a throttle check valve, which provides a permanent, throttled connection and, if the pressure in the pumping chamber is greater than the pressure in the reservoir, an unthrottled connection.
- the reservoir can also be filled again with delivery fluid when the delivery chamber is vented, since then a portion of the delivery fluid is pumped into the reservoir.
- the throttle check valve in the unged rosselten state has a flow coefficient which is smaller than the flow coefficient of the pressure valve, wherein preferably the flow coefficient of the unthrottled degassing valve is less than 15%, more preferably less than 5% of the flow coefficient of the pressure valve.
- the degassing valve is a check valve which opens when the pressure in the delivery chamber is less than the pressure in the reservoir.
- the embodiment with check valve is advantageous if the pressure in the reservoir is greater than the pressure in the suction line, then During the suction stroke fluid can be removed from the reservoir, even if the pressure in the delivery chamber does not fall below the pressure in the suction line.
- the reservoir is connected to the pressure connection.
- the degassing valve is particularly preferably connected in series with the pressure valve, wherein the degassing valve is arranged closer to the delivery chamber.
- delivery fluid which is pumped from the delivery chamber into the pressure line, must first flow through the degassing valve and then through the pressure valve.
- the reservoir is then formed by the connecting line between the degassing valve on the one hand and the pressure valve on the other.
- the reservoir is automatically replenished, which must be done manually from the separate reservoir from and to.
- the flow coefficient of the degassing valve from the delivery chamber into the reservoir should be approximately equal to the flow coefficient of the pressure valve.
- the reservoir is connected to an accumulator.
- An accumulator or hydraulic accumulator stores the liquid, ie the conveying fluid, under pressure.
- an accumulator can be formed by a pressure vessel, the interior of which is divided by a movable partition member into two spaces, wherein in one space, a gas, which serves as a pressure accumulator, and in the other space, the conveying fluid is stored.
- the positive displacement pump can be used in a metering system with a pressure line in which conveying fluid at a pressure p2 is contained, and with a suction line in which conveying fluid is contained at a pressure pi ⁇ p2, wherein the pressure line to the pressure port and the suction line connected to the suction port.
- the delivery fluid is pressurized in the reservoir with a pressure p3, wherein pi
- This embodiment has the advantage that when there is too much gas in the pumping chamber and therefore no pumped fluid pumped via the pressure valve in the pressure line and at the end of the suction stroke no further pumping fluid through the suction line, the suction valve is sucked into the pumping chamber, instead during the suction stroke is introduced via the degassing valve delivery fluid from the reservoir into the delivery chamber with the result that the pressure in the delivery chamber increases during the next pressure stroke.
- Figure 1 is a schematic representation of a preferred embodiment.
- FIG. 1 schematically shows a metering system with a positive displacement pump.
- the metering system serves to pump a delivery fluid from a suction line 1, in the conveying fluid with the fluid pressure pi, to pump in a pressure line 6, in the conveying fluid under a fluid pressure p2, wherein
- the positive-displacement pump has a delivery chamber 3 in which a displacement element 11 constructed as a membrane can be moved back and forth between two positions, wherein in the first position, which is shown in dashed lines in the figure and designated by the reference numeral 4 ', the delivery chamber has a smaller volume, and in the second position, which is shown in solid lines and provided with the reference numeral 4, the delivery chamber has a larger volume. If the membrane is moved from the position 4 'to the position 4, the volume of the delivery space 3 thus increases and the pressure in the delivery space drops. As soon as the pressure in the delivery chamber is smaller than the pressure pi in the suction line 1, the suction valve 2 arranged between the suction line 1 and the delivery chamber 3 opens, which is designed as a check valve. As a result, Forderfluid is transported from the suction line 1 in the delivery chamber 3.
- the pressure in the delivery chamber 3 continues to increase until the pressure p2 in the pressure line 6 is reached or exceeded.
- the pressure valve 5 opens and Forderfluid is transported from the conveyor chamber 3 in the pressure line 6.
- a reservoir 10 and a degassing valve 7 are now provided between the delivery chamber 3 and the pressure valve 5, which is likewise designed as a check valve.
- the reservoir 10 is formed by the connecting line between the degassing valve 7 and the pressure valve 5.
- the degassing valve 7 is designed as a throttle check valve, i. it consists of a throttled connection 9 and a check valve eighth
- the degassing valve 7 does not affect the functioning of the positive displacement pump.
- the advantages of the inventive arrangement of the reservoir and the degassing valve become clear only when, what can happen during operation or after a long standstill, the delivery chamber 3 contains too large a proportion of gaseous components. Because of the comparatively high compressibility of the gaseous constituents, this may in some circumstances mean that the movement of the membrane from position 4 to position 4 'is no longer sufficient to increase the pressure in delivery chamber 3 to such an extent that pressure p2 is reached and the check valve 5 can be opened. In this state, although the membrane between the positions 4 and 4 'reciprocated, but there is neither an opening of the suction valve 2 nor an opening of the pressure valve. 5
- the pressure in the delivery chamber 3 will drop so much during the suction stroke that further Forderfluid from the suction line 1 via the suction valve 2 is sucked. This also leads to an increase in the pressure in the delivery chamber 3 at the end of the pressure stroke, since there is now more delivery fluid in the delivery chamber 3.
- the pressure in the delivery chamber 3 will rise until the gas can be compressed to such an extent that it is possible to open the pressure valve 5 and press the gas into the pressure line.
- the degassing valve 7 can in principle be constructed in the same way as described in WO 2013/135681 A1, i. it can have a valve body and a valve seat, between which, even in the closed position, a reflux channel, which is formed for example by a groove, is formed.
- the degassing valve is a leaking check valve.
- the structure described has the advantage that even when working against high pressures in the suction line 6, the dosing does not decrease, since the pressure line 6 is not permanently in contact with the degassing valve 7. This is also advantageous for safety reasons, since in the case of a diaphragm fracture there is no permanent connection between metering line 6 on the one hand and delivery chamber 3 on the other hand.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
- Details Of Reciprocating Pumps (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102014112833.8A DE102014112833A1 (en) | 2014-09-05 | 2014-09-05 | Positive displacement pump with fluid reservoir |
PCT/EP2015/069933 WO2016034576A1 (en) | 2014-09-05 | 2015-09-01 | Displacement pump with fluid reservoir |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3189234A1 true EP3189234A1 (en) | 2017-07-12 |
EP3189234B1 EP3189234B1 (en) | 2018-11-07 |
Family
ID=54072813
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15762528.6A Not-in-force EP3189234B1 (en) | 2014-09-05 | 2015-09-01 | Displacement pump with fluid reservoir |
Country Status (9)
Country | Link |
---|---|
US (1) | US20170198689A1 (en) |
EP (1) | EP3189234B1 (en) |
JP (1) | JP2017525884A (en) |
KR (1) | KR20170052559A (en) |
CN (1) | CN106795873B (en) |
BR (1) | BR112017002095A2 (en) |
DE (1) | DE102014112833A1 (en) |
SG (1) | SG11201700200RA (en) |
WO (1) | WO2016034576A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP7232989B2 (en) * | 2019-09-11 | 2023-03-06 | パナソニックIpマネジメント株式会社 | washing machine |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1232738A (en) * | 1968-10-08 | 1971-05-19 | ||
DE3631982C1 (en) * | 1986-09-19 | 1988-02-04 | Hans Ing Kern | Dosing pump |
DE3827489C1 (en) * | 1988-08-12 | 1989-10-12 | Gruenbeck Wasseraufbereitung Gmbh, 8884 Hoechstaedt, De | |
DE4241030C1 (en) * | 1992-12-05 | 1994-06-01 | Lang Apparatebau Gmbh | Dosing pump with vent valve |
DE19712096C1 (en) * | 1997-03-22 | 1998-04-02 | Lang Apparatebau Gmbh | Dosing pump for conveying fluids through suction valve |
US6848408B1 (en) * | 2002-07-23 | 2005-02-01 | Edward Charles Mendler | Intake port |
US7175397B2 (en) | 2002-09-27 | 2007-02-13 | Pulsafeeder, Inc. | Effervescent gas bleeder apparatus |
JP4678135B2 (en) * | 2003-06-17 | 2011-04-27 | セイコーエプソン株式会社 | pump |
GB201013623D0 (en) * | 2010-08-13 | 2010-09-29 | Linde Ag | Device for monitoring gas concentration and method using the device |
JP4977791B1 (en) * | 2011-07-01 | 2012-07-18 | 株式会社タクミナ | Pump and pump operation method |
EP2737209B1 (en) * | 2011-07-28 | 2018-11-28 | Ecolab USA Inc. | A diaphragm pump for dosing a fluid and an according method |
DE102012102088A1 (en) | 2012-03-13 | 2013-09-19 | Prominent Dosiertechnik Gmbh | Positive displacement pump with forced ventilation |
CN202520500U (en) * | 2012-04-28 | 2012-11-07 | 浙江大学 | Precision metering pump driven by ultrasonic motor |
-
2014
- 2014-09-05 DE DE102014112833.8A patent/DE102014112833A1/en not_active Withdrawn
-
2015
- 2015-09-01 WO PCT/EP2015/069933 patent/WO2016034576A1/en active Application Filing
- 2015-09-01 JP JP2017507378A patent/JP2017525884A/en active Pending
- 2015-09-01 BR BR112017002095A patent/BR112017002095A2/en not_active Application Discontinuation
- 2015-09-01 US US15/320,777 patent/US20170198689A1/en not_active Abandoned
- 2015-09-01 CN CN201580045658.7A patent/CN106795873B/en not_active Expired - Fee Related
- 2015-09-01 EP EP15762528.6A patent/EP3189234B1/en not_active Not-in-force
- 2015-09-01 SG SG11201700200RA patent/SG11201700200RA/en unknown
- 2015-09-01 KR KR1020177001295A patent/KR20170052559A/en unknown
Also Published As
Publication number | Publication date |
---|---|
DE102014112833A1 (en) | 2016-03-10 |
KR20170052559A (en) | 2017-05-12 |
CN106795873A (en) | 2017-05-31 |
BR112017002095A2 (en) | 2017-11-21 |
US20170198689A1 (en) | 2017-07-13 |
JP2017525884A (en) | 2017-09-07 |
CN106795873B (en) | 2019-05-14 |
WO2016034576A1 (en) | 2016-03-10 |
SG11201700200RA (en) | 2017-02-27 |
EP3189234B1 (en) | 2018-11-07 |
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