EP0688954B1 - Gesteuerte Schnüffelbehinderung für Hochdruck-Membranpumpen - Google Patents

Gesteuerte Schnüffelbehinderung für Hochdruck-Membranpumpen Download PDF

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Publication number
EP0688954B1
EP0688954B1 EP95103877A EP95103877A EP0688954B1 EP 0688954 B1 EP0688954 B1 EP 0688954B1 EP 95103877 A EP95103877 A EP 95103877A EP 95103877 A EP95103877 A EP 95103877A EP 0688954 B1 EP0688954 B1 EP 0688954B1
Authority
EP
European Patent Office
Prior art keywords
piston
channel
pressure
reservoir
valve
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
EP95103877A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0688954A1 (de
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/de
Application granted granted Critical
Publication of EP0688954B1 publication Critical patent/EP0688954B1/de
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 high-pressure diaphragm pump.
  • a diaphragm pump is known from GB-A-887.774. However, this is a conventional diaphragm pump, which is only suitable for low pressures. A Supply of a hydraulic fluid that may need to be filled is only possible in the end position of the drive piston.
  • FR-A-1,122,901 From FR-A-1,122,901 is a hydraulically driven Diaphragm pump known, which is also only for low Prints is suitable.
  • the hydraulic fluid reservoir sits directly on the cylinder of the drive piston and enables hydraulic fluid supply when the drive piston releases the inlet.
  • a diaphragm pump can be found in DE-A-1 453 579, in which a timed relationship to the drive piston operated slide is provided, the one Connection between the hydraulic pressure chamber and the reservoir open for the hydraulic fluid and can close.
  • a sniffer valve is in this diaphragm pump not provided.
  • sniffing device In the case of diaphragm pumps, there is usually a leakage a so-called sniffing device, provided which is a sniffer connection in the form of a connecting channel between the pressure chamber and the storage room.
  • This connection channel is normally controlled by a vacuum spring-loaded sniffer valve closed.
  • the sniffer valve then responds or opens then the connection between the pressure room and the storage room, if the piston suffers from a lack of hydraulic fluid during the suction stroke caused excessive vacuum in the hydraulic system generated. This negative pressure in the work area will detected by the sniffer valve, so that then the missing Hydraulic fluid in the pressure chamber above that from the reservoir coming connection channel can be supplemented.
  • a modified membrane control system is also already available known, by means of which also a premature Leakage supplementation can be prevented.
  • a premature Leakage supplementation can be prevented.
  • the respective membrane system Control system provided that with spring-loaded control pins is working. These usually hold the leakage valve mechanically closed. However, if by the diaphragm is movably guided in the suction stroke end position Perforated plate against the force of springs accordingly is moved, this also moves the control pins, so that the leakage valve is released.
  • the invention is therefore based on the object, the diaphragm pump of the generic type for the elimination of the described To design disadvantages such that with little constructive effort to address the Sniffer valve, especially during the occurrence of the Coupling vacuum peak, is prevented and thus avoided is that such negative pressure peaks already at the beginning trigger the sniffer valve during the suction stroke.
  • the invention is based on the essential idea that Sniffer connection between pressure room and storage room not by the membrane structure, but by the location of the Control the displacer yourself. This is done in such a way that the piston as a control element, in particular as a control slide, serves the at least at the beginning of the suction stroke Sniffer connection between pressure room and storage room interrupts and only releases this connection when he has covered part of his suction stroke.
  • the piston preferably provides the sniffing connection then free when he has traveled about half of his stroke Has.
  • the piston it is possible to use the piston to act directly or indirectly as a spool, but in any case with a membrane control system associated design effort is avoided.
  • the Control is according to the low pressure side provided so that here by the piston each a channel on the pantry side is closed is held or opened in a controlled manner.
  • the design be taken such that the pantry side Channel of the sniffer connection in the cylinder bore for the piston opens.
  • This canal-side canal then with a piston channel that opens into the storage space, associated when the piston is part of its Suction stroke.
  • the piston it is also possible to indirectly use the piston to act as a control, for example the piston at its rear end with a parallel running Auxiliary control slide is connected.
  • This is in a part of the sniffer connection channel on the storage room side displaceable and because it is hollow or is designed as a sleeve, the connection to the storage room interrupt depending on the stroke position of the displacer or release.
  • the invention is simple prevents that at the beginning of the suction stroke in the hydraulic system occurring vacuum peak a premature response of the snifting valve causes an overfill of the pressure chamber with hydraulic fluid.
  • Diaphragm pump is a high pressure diaphragm pump, in which a metal membrane 1 is used. This is between two perforated plates 2, 3 - a perforated plate 2 with flat inner surface and a perforated plate 3 with concave Inner surface - clamped. These in turn are between a pump housing 4 and one detachable on the front side fixed pump cover 5 clamped.
  • the membrane 1 separates a delivery chamber 6 from one Hydraulic fluid filled pressure chamber 7.
  • the diaphragm pump shown has a hydraulic one Diaphragm drive in the form of an oscillating displacement piston 8 on, which is sealed in the pump housing 4 between the Pressure chamber 7 and a reservoir 9 for the hydraulic fluid is movable.
  • the piston 8 is sealed by means of a so-called joint seal.
  • the pump cover 5 has a spring-loaded in the usual way Inlet valve 10 and a spring-loaded outlet valve 11 on. These two valves 10, 11 are above one Inlet channel 12 and an outlet channel 13 with the Delivery chamber 6 in connection that the medium is at the 1 to the right according to FIG. 1 suction stroke of the displacer 8 and thus the membrane 1 in the direction of the arrow the inlet valve 10 and the inlet channel 12 into the delivery chamber 6 is sucked in.
  • the pumped medium in the pressure stroke to the left according to FIG. 1 of the piston 8 and thus the membrane 1 via the outlet channel 13 and the outlet valve 11 metered in the direction of the arrow from the Delivery chamber 6 pushed out.
  • a pressure relief valve 14 is provided, the via corresponding channels 15, 16 with the pressure chamber 7 and communicates with the storage room 9; it is so set that when an undesirable occurs large overpressure in the pressure chamber 7 at the end of the pressure stroke of the piston 8 opens, so that the excess Hydraulic fluid via the channels 15, 16 in the storage room 9 is discharged.
  • a leak supplement device 17 is provided.
  • This has a conventional spring-loaded, vacuum-controlled Sniffer valve 18, which via a channel 19 with the Storage room 9 communicates.
  • the connection of the leak supplement device 17 or the sniffer valve 18 with the pressure chamber 7 takes place via a further channel 20 which, 1, from the snifting valve 18 leads directly into the cylinder bore 21 for the piston 8 or flows there.
  • This channel 20 on the pressure chamber side opens at one point the piston cylinder bore 21, which is about half the stroke h of the piston 8, i.e. in the middle between whose front and rear dead center lies.
  • the piston 8 holds the pressure chamber side Channel 20 of the leak supplement device 17 at the beginning of its Suction strokes are closed, so that the sniffer connection interrupted between pressure chamber 7 and storage room 9 is. This connection is only then through the piston 8 released when he has covered part of his suction stroke Has. Only then is the leak supplement device 17 or the sniffer valve 18 is able to when a Excessive negative pressure caused by leakage losses for refilling hydraulic fluid from the storage room 9 to worry about.
  • the arrangement shown, in which the controlled Sniffing on the high pressure side is suitable are particularly suitable for stroke-controlled diaphragm pumps with constant Piston center position.
  • the piston 8 as a spool for temporarily blocking the Leakage supplement 17 used to their premature To prevent response at the beginning of the piston suction stroke.
  • To The beginning of the suction stroke is the piston 8 in the Position according to Fig. 1, in the front face approximately flush with the corresponding wall of the pressure chamber 7 completes.
  • that of position 3 2 corresponds to the two diagrams, is the Channel 20 of the leakage supplement device 17 on the pressure chamber side closed by the piston 8.
  • the invention is - in contrast to the high-pressure control of the Sniffing disability according to FIG. 1 - a low-pressure side Control of sniffing disability provided.
  • This is suitable are particularly suitable for diaphragm pumps with constant stroke length, the seal of the piston 8 within its cylinder bore 21 also - just like the one previously described Embodiment according to FIG. 1 - by means of a Single joint seal is formed.
  • the duct 19 on the storage room side which, starting from the sniffer valve 18, runs in the direction of the pantry, is also intended.
  • the sniffer valve 18 opens opposite end not directly in the storage room 9, but as it were only indirectly.
  • the piston 8 points at a certain point on it Longitudinal extension of an annular groove 23, this point is selected such that it is at a distance h (piston stroke) to the additional channel 19a when the piston 8 is 3 front dead center position (pressure stroke end) having.
  • the annular groove is located 23 of the piston 8 at the level of the additional channel 19a.
  • the sniffer connection via channels 19a, 19 and 20a produced between the storage space 9 and the pressure space 7, so when in the hydraulic system due to a defect there is an excessive vacuum in hydraulic fluid, the sniffer valve 18 responds and automatically the missing Hydraulic fluid from the reservoir 9 supplemented.
  • the ring groove shifts 23 of the piston 8 immediately out of alignment with the additional channel 19, so that it is closed immediately and the Sniffer connection interrupts.
  • the configuration is similar to that of the embodiment 3 taken. What is different, however, is that the Piston 8 in its bore 21 not by means of a single-joint seal, but sealed by means of piston rings 24 is in the usual way on the piston 8th are set.
  • the piston 8 instead of an annular groove 23 with a provided reduced diameter piston part 8a, so that thereby between this reduced diameter piston part 8a and the associated cylinder bore 21 an annular space 23a is formed, the function of that of the annular groove 23 corresponds.
  • the canal-side duct 19 connected additional channel 19a formed such that it transverse to the axis of the piston 8 - not the whole Insert 22 penetrates, but only in the cylinder bore 21 of the piston 8 opens out.
  • the connection between the additional channel 19a and the storage room 9, at corresponding piston position, manufactured in that in the insert 22 is a further channel 19b provided by the Storage space 9 extends to the cylinder bore 21 of the piston 8 and there at a point that is offset from the mouth of the additional channel 19a, opens out.
  • Fig. 4 is shown in the Position of the piston 8, the position at the end of Pressure stroke or at the beginning of the suction stroke according to the Corresponds to position 3 in the two diagrams according to FIG. 2, the sniffer connection between the storage room 9 and the pressure chamber 7 interrupted.
  • the piston 8 in the course of its suction stroke the position 4 in the two diagrams according to FIG. 2, because here the two channels 19a, 19b still through the Pistons 8 are closed, so that in this position occurring vacuum peak does not lead to a premature response of the snifting valve 18 can lead. Only, when the piston 8 is in the course of its further suction stroke the position 1 in the two diagrams according to FIG.
  • the Piston 8 parallel at its storage chamber end trending auxiliary spool in the form of an additional Control piston 25 on.
  • This is on a piston 8 attached flange 26 arranged in the vicinity of its circumference and runs in such a way that it runs in a corresponding Channel 27 of the housing 4 is immersed.
  • This housing channel 27 stands, as shown, on the one hand with the channel 19 of the leakage supplement device on the storage room side 17 in connection and on the other hand opens into the storage room 9 out.
  • the additional control piston 25 is hollow or as a sleeve ends open on both sides. This will, on the one hand in the position shown of the piston 8, which the End of the pressure stroke or the start of the suction stroke according to the Corresponds to position 3 in the two diagrams according to FIG. 2, the sniffer connection between the pantry 9 and the Pressure chamber 7 interrupted, since the control piston 25 largely is completely immersed in the housing channel 27 and thus closes the channel 19 on the storage room side.
  • the sniffing connection between the storage room 9 and the pressure chamber 7 - over the hollow control piston 25, the housing channel 27, the storage room side Channel 19 and the pressure chamber side channel 20a-manufactured so that with a corresponding negative pressure in the pressure chamber 7 the sniffer valve 18 responds and for an automatic Leakage supplement 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 Gesteuerte Schnüffelbehinderung für Hochdruck-Membranpumpen Expired - Lifetime EP0688954B1 (de)

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 EP0688954A1 (de) 1995-12-27
EP0688954B1 true EP0688954B1 (de) 1998-06-10

Family

ID=6520615

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95103877A Expired - Lifetime EP0688954B1 (de) 1994-06-15 1995-03-16 Gesteuerte Schnüffelbehinderung für Hochdruck-Membranpumpen

Country Status (4)

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

Families Citing this family (17)

* 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
DE102006044252B3 (de) * 2006-09-16 2008-02-28 Thomas Magnete Gmbh Membranpumpe zur Förderung und Dosierung eines Fluids
WO2008031418A2 (de) * 2006-09-16 2008-03-20 Thomas Magnete Gmbh Membranpumpe
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
DE102014010108B4 (de) 2014-07-08 2016-01-28 Lewa Gmbh Hydraulisch angetriebene Membranpumpe
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
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

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Publication number Priority date Publication date Assignee Title
US2902936A (en) * 1955-03-17 1959-09-08 Kontak Mfg Co Ltd Pumps for metering liquids
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
US3149469A (en) * 1962-04-27 1964-09-22 Milton Roy Co Controlled volume pump
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
EP0055467B1 (de) * 1980-12-29 1984-12-05 LEWA Herbert Ott GmbH + Co. Membranpumpe mit druckentlastet eingespannter Membran
US4365745A (en) * 1981-02-05 1982-12-28 Louis Beck Diaphragm pump
DE3542926A1 (de) * 1985-12-04 1987-06-11 Kopperschmidt Mueller & Co Pumpe
DE4141670C2 (de) * 1991-12-17 1994-09-29 Ott Kg Lewa Hydraulisch angetriebene Membranpumpe mit Membranhubbegrenzung

Also Published As

Publication number Publication date
DE4420863C2 (de) 1998-05-14
EP0688954A1 (de) 1995-12-27
US5655894A (en) 1997-08-12
DE59502465D1 (de) 1998-07-16
DE4420863A1 (de) 1995-12-21
JPH084656A (ja) 1996-01-09

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