EP0688954A1 - Dispositif de supplément contrÔlé pour des pompes à membrane et à haute pression - Google Patents

Dispositif de supplément contrÔlé pour des pompes à membrane et à haute pression Download PDF

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Publication number
EP0688954A1
EP0688954A1 EP95103877A EP95103877A EP0688954A1 EP 0688954 A1 EP0688954 A1 EP 0688954A1 EP 95103877 A EP95103877 A EP 95103877A EP 95103877 A EP95103877 A EP 95103877A EP 0688954 A1 EP0688954 A1 EP 0688954A1
Authority
EP
European Patent Office
Prior art keywords
piston
sniffer
connection
pressure chamber
channel
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
Application number
EP95103877A
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German (de)
English (en)
Other versions
EP0688954B1 (fr
Inventor
Horst Dipl. Ing. Fritsch
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.)
Lewa GmbH
Lewa Herbert Ott GmbH and Co KG
Original Assignee
Lewa GmbH
Lewa Herbert Ott GmbH and Co KG
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 Lewa GmbH, Lewa Herbert Ott GmbH and Co KG filed Critical Lewa GmbH
Publication of EP0688954A1 publication Critical patent/EP0688954A1/fr
Application granted granted Critical
Publication of EP0688954B1 publication Critical patent/EP0688954B1/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 hydraulically driven diaphragm pump according to the preamble of claim 1.
  • a leakage supplement device a so-called sniffing device
  • a sniffing device which has a sniffing connection in the form of a connecting channel between the pressure chamber and the storage chamber.
  • This connection channel is normally closed by a vacuum-controlled, spring-loaded sniffer valve.
  • the snifting valve then responds or opens the connection between the pressure chamber and the storage chamber when the piston generates an excessive vacuum in the hydraulic system caused by a lack of hydraulic fluid during the suction stroke.
  • This negative pressure in the work space is detected by the sniffer valve, so that the missing hydraulic fluid in the pressure space can then be supplemented via the connecting channel coming from the storage space.
  • a modified membrane system control is also known, by means of which premature leakage supplementation can also be prevented.
  • a control system influenced by the respective membrane system is also provided, which works with spring-loaded control pins. These normally keep the leakage valve closed mechanically. However, if a movably guided perforated plate is moved accordingly against the force of springs through the membrane in the suction stroke end position, the control pins are also displaced thereby, so that the leakage supplement valve is released.
  • the invention is therefore based on the object of designing the diaphragm pump of the generic type in order to eliminate the disadvantages described in such a way that a premature response of the snifting valve, in particular during the occurrence of the coupling vacuum peak, is prevented with little design effort and thus prevents such vacuum peaks from already occurring trigger the sniffer valve at the beginning of the suction stroke.
  • the invention is based on the essential idea of controlling the sniffer connection between the pressure chamber and the storage chamber not by the membrane system but by the position of the displacement piston itself. This is done in such a way that the piston serves as a control element, in particular as a control slide, which at least at the beginning of the suction stroke interrupts the sniffer connection between the pressure chamber and the storage chamber and only releases this connection when it has covered part of its suction stroke. In this case, the piston preferably releases the sniffer connection when it has covered approximately half of its stroke.
  • Such a sniffing obstruction controlled by means of the respective piston position, can be achieved with simple constructive means, at the same time ensuring that it works effectively.
  • the piston act directly or indirectly as a control slide, but in any case the design effort associated with a diaphragm control system is avoided.
  • the arrangement is preferably such that this pressure chamber side channel of the sniffer connection opens into the cylinder bore for the piston.
  • This pressure chamber-side channel of the sniffing connection is therefore only released by the piston for the purpose of supplementing the leak when the latter has covered a certain distance of its suction stroke, so that the vacuum peak which occurred at the beginning of the suction stroke has remained ineffective.
  • the configuration can be such that the reservoir-side channel of the sniffer connection opens into the cylinder bore for the piston. This canal-side canal then connected to a piston channel, which opens into the storage space, when the piston has covered part of its suction stroke.
  • the piston in a modification of this, it is also possible for the piston to act indirectly as a control element, for example by connecting the piston at its rear end to a parallel auxiliary control slide.
  • This is displaceable in a part of the channel of the sniffer connection on the storage space side and can, because it is hollow or as a sleeve, interrupt or release the connection to the storage space depending on the stroke position of the displacement piston.
  • the invention prevents with simple means that the vacuum peak occurring in the hydraulic system at the start of the suction stroke causes the snifting valve to respond prematurely, which would result in the pressure chamber being overfilled with hydraulic fluid.
  • the hydraulically driven diaphragm pump shown in FIG. 1 is a high-pressure diaphragm pump in which a metal diaphragm 1 is used. This is clamped between two perforated plates 2, 3 - a perforated plate 2 with a flat inner surface and a perforated plate 3 with a concave inner surface. These, in turn, are clamped between a pump housing 4 and a pump cover 5, which is detachably attached to the front of the latter.
  • the membrane 1 separates a delivery chamber 6 from a pressure chamber 7 filled with hydraulic fluid.
  • the diaphragm pump shown has a hydraulic diaphragm drive in the form of an oscillating displacement piston 8, which can be displaced in a sealed manner in the pump housing 4 between the pressure chamber 7 and a storage chamber 9 for the hydraulic fluid.
  • the piston 8 is sealed by means of a so-called ground-in seal.
  • the pump cover 5 has a spring-loaded inlet valve 10 and a spring-loaded outlet valve 11 in the usual way. These two valves 10, 11 are connected via an inlet channel 12 and an outlet channel 13 to the delivery chamber 6 in such a way that the conveying medium during the suction stroke of the displacer 8 and thus the diaphragm 1 to the right according to FIG the inlet valve 10 and the inlet channel 12 is sucked into the delivery chamber 6. In contrast, the pumped medium is then metered out of the delivery chamber 6 in the direction of the arrow during the pressure stroke of the piston 8 and thus of the membrane 1 via the outlet channel 13 and the outlet valve 11.
  • a pressure limiting valve 14 which communicates with the pressure chamber 7 and the storage chamber 9 via corresponding channels 15, 16 communicates; it is set such that it opens when an undesirably large excess pressure in the pressure chamber 7 occurs at the end of the pressure stroke of the piston 8, so that the excess hydraulic fluid is then discharged into the reservoir 9 via the channels 15, 16.
  • a leakage supplementation device 17 is provided.
  • This has a conventional spring-loaded, vacuum-controlled sniffer valve 18, which is connected to the storage space 9 via a channel 19.
  • the leak supplement device 17 or the sniffer valve 18 is connected to the pressure chamber 7 via a further channel 20 which, as can be clearly seen in FIG. 1, leads from the sniffer valve 18 directly into the cylinder bore 21 for the piston 8 or opens there.
  • this pressure chamber-side channel 20 opens into the piston cylinder bore 21 at a point which is approximately half the stroke h of the piston 8, i.e. in the middle between its front and rear dead center.
  • the piston 8 holds the pressure chamber side Channel 20 of the leakage supplement device 17 is closed at the beginning of its suction stroke, so that the sniffer connection between the pressure chamber 7 and the storage chamber 9 is thereby interrupted. This connection is only released by the piston 8 when it has covered part of its suction stroke. Only then is the leakage replenishment device 17 or the sniffer valve 18 able to replenish hydraulic fluid from the reservoir 9 when an excessively high vacuum caused by leakage losses occurs.
  • the arrangement shown, in which the controlled sniffing hindrance occurs on the high pressure side, is particularly suitable for stroke-controllable diaphragm pumps with a constant piston center position.
  • the piston 8 is used as a control slide for temporarily blocking the leakage supplement device 17 in order to prevent its premature response at the beginning of the piston suction stroke.
  • the piston 8 is in the position according to FIG. 1, in which its front end surface is approximately flush with the corresponding wall of the pressure chamber 7.
  • the channel 20 of the leakage supplement device 17 on the pressure chamber side is closed by the piston 8.
  • control of the sniffing obstruction on the low-pressure side is provided.
  • This is particularly suitable for diaphragm pumps with a constant stroke length, the sealing of the piston 8 within its cylinder bore 21 likewise being formed by means of a single-joint seal, just as in the previously described embodiment according to FIG. 1.
  • the pressure chamber-side channel 20a starting from the snifting valve 18 of the treat device 17 is arranged in such a way that it does not open into the cylinder bore 21 of the displacer 8, but rather runs to the pressure chamber 7 and opens out at its end wall.
  • the channel 19 on the storage room side which, starting from the sniffer valve 18, runs in the direction of the storage room, is also provided. However, its end facing away from the snifting valve 18 does not open directly into the storage space 9, but, as it were, only indirectly.
  • the channel 19 on the storage room side opens with its end facing away from the snifting valve 18 into an additional channel 19a, which - transversely extending to the axis of the displacer 8 - runs in a bush-like insert 22 which displaceably guides the piston 8 and in turn opens into the storage space 9.
  • the piston 8 has an annular groove 23 at a specific point on its longitudinal extent, this point being selected such that it is at a distance h (piston stroke path) from the additional duct 19a when the piston 8 is at its front dead center position (pressure stroke end shown in FIG. 3) ) having.
  • the configuration is similar to the embodiment according to FIG. What is different, however, is that the piston 8 is sealed in your bore 21 not by means of a single-joint seal, but by means of piston rings 24, which are fixed on the piston 8 in the usual way.
  • piston 8 instead of an annular groove 23 is provided with a reduced-diameter piston part 8a, so that an annular space 23a is formed between this reduced-diameter piston part 8a and the associated cylinder bore 21, which function corresponds to that of the annular groove 23.
  • the additional channel 19a connected to the storage chamber-side channel 19 is designed in such a way that it does not pass through the entire insert 22, transverse to the axis of the piston 8, but only opens into the cylinder bore 21 of the piston 8.
  • the connection between the additional channel 19a and the storage space 9 is made, with a corresponding piston position, in that a further channel 19b is provided in the insert part 22, which extends from the storage space 9 to the cylinder bore 21 of the piston 8 and there at a point which displaces to the mouth of the additional channel 19a, opens out.
  • low-pressure control of the sniffing obstruction is also provided.
  • the piston 8 has a parallel auxiliary control slide in the form of an additional control piston 25 at its storage chamber end. This is arranged on a flange 26 attached to the piston 8 in the vicinity of its circumference and extends in such a way that it plunges into a correspondingly extending channel 27 of the housing 4. As shown, this housing channel 27 is connected, on the one hand, to the channel 19 of the leakage supplement device 17 on the storage room side and, on the other hand, opens out into the storage room 9.
  • the additional control piston 25 is hollow or a sleeve with ends open on both sides.
  • the position of the piston 8 shown which corresponds to the end of the pressure stroke or the beginning of the suction stroke according to FIG Position 3 in the two diagrams according to FIG. 2 corresponds to the sniffer connection between the storage chamber 9 and the pressure chamber 7 being interrupted, since the control piston 25 is largely completely immersed in the housing channel 27 and thus closes the channel 19 on the storage chamber side.
  • the sniffer connection between the storage chamber 9 and the pressure chamber 7 - via the hollow control piston 25, the housing channel 27, the storage chamber-side channel 19 and the pressure chamber-side channel 20a - is made, so that with a corresponding negative pressure in the pressure chamber 7, the sniffer valve 18 responds and for an automatic leak replenishment from the storage room 9 ensures.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
EP95103877A 1994-06-15 1995-03-16 Dispositif de supplément contrÔlé pour des pompes à membrane et à haute pression Expired - Lifetime EP0688954B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4420863A DE4420863C2 (de) 1994-06-15 1994-06-15 Gesteuerte Schnüffelbehinderung für Hochdruck-Membranpumpen
DE4420863 1994-06-15

Publications (2)

Publication Number Publication Date
EP0688954A1 true EP0688954A1 (fr) 1995-12-27
EP0688954B1 EP0688954B1 (fr) 1998-06-10

Family

ID=6520615

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95103877A Expired - Lifetime EP0688954B1 (fr) 1994-06-15 1995-03-16 Dispositif de supplément contrÔlé pour des pompes à membrane et à haute pression

Country Status (4)

Country Link
US (1) US5655894A (fr)
EP (1) EP0688954B1 (fr)
JP (1) JPH084656A (fr)
DE (2) DE4420863C2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014010108A1 (de) 2014-07-08 2016-01-14 Lewa Gmbh Hydraulisch angetriebene Membranpumpe
CN111828331A (zh) * 2020-08-28 2020-10-27 唐慈津 一种防堵塞污水水泵

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3601148B2 (ja) * 1994-12-26 2004-12-15 アイシン精機株式会社 ベローズポンプ
US5707219A (en) * 1995-10-04 1998-01-13 Wanner Engineering Diaphragm pump
DE19826610A1 (de) 1998-06-16 1999-12-23 Bran & Luebbe Membranpumpe und Vorrichtung zur Steuerung derselben
US6278246B1 (en) * 1998-11-19 2001-08-21 Thomas Consumer Electronics, Inc. Dynamic focus voltage amplitude controller and high frequency compensation
DE10056568C1 (de) 2000-11-15 2002-01-03 Horst Kleibrink Vorrichtung zur Einhaltung der korrekten Ölüberströmmenge an Membrankompressoren
JP4741125B2 (ja) * 2001-09-27 2011-08-03 新コスモス電機株式会社 携帯型ガス検知器
DE10322221B3 (de) * 2003-05-16 2005-01-27 Lewa Herbert Ott Gmbh + Co Leckageüberwachung im Hydraulikdruckraum einer Membranpumpe
DE10341223A1 (de) * 2003-09-04 2005-03-24 Bühler AG Schleif- bzw. Poliermaschine
WO2008031418A2 (fr) * 2006-09-16 2008-03-20 Thomas Magnete Gmbh Pompe à membrane
DE102006044252B3 (de) * 2006-09-16 2008-02-28 Thomas Magnete Gmbh Membranpumpe zur Förderung und Dosierung eines Fluids
GB2443422B (en) * 2006-10-31 2011-02-23 Dlp Ltd Pump and pumped shower drain system
US20140144131A1 (en) * 2010-07-27 2014-05-29 Delaware Capital Formation, Inc. Energy Efficient Variable Displacement Dosing Pump
DE102010039829A1 (de) * 2010-08-26 2012-03-01 Prominent Dosiertechnik Gmbh Membranpumpe mit trägheitsgesteuertem Leckergänzungsventil
DE102014109801A1 (de) * 2014-07-11 2016-01-14 Prominent Gmbh Membranpumpe mit reduzierter Leckageergänzung im Überlastfall
CN110925174B (zh) * 2019-11-28 2022-06-24 陕西航天动力高科技股份有限公司 一种隔膜泵柱塞腔排液装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1122901A (fr) * 1955-04-22 1956-09-14 Perfectionnements aux pompes à diaphragme
GB887774A (en) * 1959-06-26 1962-01-24 Charles Wilfred Simpson Improvements in and relating to diaphragm pumps
DE1453579A1 (de) * 1962-04-27 1969-04-30 Milton Roy Co Pumpe
EP0226122A2 (fr) * 1985-12-04 1987-06-24 Kopperschmidt-Mueller GmbH & Co KG Pompe

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2902936A (en) * 1955-03-17 1959-09-08 Kontak Mfg Co Ltd Pumps for metering liquids
DE1453597C3 (de) * 1962-12-04 1973-12-06 Orlita Kg, 6300 Giessen Membranpumpe mit regelbarer For dermenge
FR1376286A (fr) * 1963-12-04 1964-10-23 Orlita Kommanditgesellschaft Pompe à membrane à quantité réglable de liquide d'alimentation
US3354831A (en) * 1966-11-04 1967-11-28 Weatherhead Co Piston diaphragm pump
DE1653586C3 (de) * 1967-06-21 1975-08-28 Orlita Kg, 6300 Giessen Pumpe mit hin- und herbewegbarem Kolben
US3680981A (en) * 1970-12-21 1972-08-01 Josef Wagner Pump and method of driving same
ATE10670T1 (de) * 1980-12-29 1984-12-15 Lewa Herbert Ott Gmbh + Co. Membranpumpe mit druckentlastet eingespannter membran.
US4365745A (en) * 1981-02-05 1982-12-28 Louis Beck Diaphragm pump
DE4141670C2 (de) * 1991-12-17 1994-09-29 Ott Kg Lewa Hydraulisch angetriebene Membranpumpe mit Membranhubbegrenzung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1122901A (fr) * 1955-04-22 1956-09-14 Perfectionnements aux pompes à diaphragme
GB887774A (en) * 1959-06-26 1962-01-24 Charles Wilfred Simpson Improvements in and relating to diaphragm pumps
DE1453579A1 (de) * 1962-04-27 1969-04-30 Milton Roy Co Pumpe
EP0226122A2 (fr) * 1985-12-04 1987-06-24 Kopperschmidt-Mueller GmbH & Co KG Pompe

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014010108A1 (de) 2014-07-08 2016-01-14 Lewa Gmbh Hydraulisch angetriebene Membranpumpe
DE102014010108B4 (de) * 2014-07-08 2016-01-28 Lewa Gmbh Hydraulisch angetriebene Membranpumpe
CN111828331A (zh) * 2020-08-28 2020-10-27 唐慈津 一种防堵塞污水水泵
CN111828331B (zh) * 2020-08-28 2021-10-08 浙江丰源泵业有限公司 一种防堵塞污水水泵

Also Published As

Publication number Publication date
DE4420863A1 (de) 1995-12-21
US5655894A (en) 1997-08-12
EP0688954B1 (fr) 1998-06-10
DE4420863C2 (de) 1998-05-14
JPH084656A (ja) 1996-01-09
DE59502465D1 (de) 1998-07-16

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