EP0378629B1 - Piston pump - Google Patents

Piston pump Download PDF

Info

Publication number
EP0378629B1
EP0378629B1 EP89907131A EP89907131A EP0378629B1 EP 0378629 B1 EP0378629 B1 EP 0378629B1 EP 89907131 A EP89907131 A EP 89907131A EP 89907131 A EP89907131 A EP 89907131A EP 0378629 B1 EP0378629 B1 EP 0378629B1
Authority
EP
European Patent Office
Prior art keywords
damping hose
piston pump
damping
hose
filter element
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
EP89907131A
Other languages
German (de)
French (fr)
Other versions
EP0378629A1 (en
Inventor
Ludwig Budecker
Anton David
Hans-A. Guse
Ulrich Zutt
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.)
Continental Teves AG and Co oHG
Original Assignee
Alfred Teves 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 Alfred Teves GmbH filed Critical Alfred Teves GmbH
Publication of EP0378629A1 publication Critical patent/EP0378629A1/en
Application granted granted Critical
Publication of EP0378629B1 publication Critical patent/EP0378629B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
    • F04B11/0008—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using accumulators
    • F04B11/0016—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using accumulators with a fluid spring
    • 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
    • F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
    • 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
    • F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
    • F04B11/0008—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using accumulators
    • F04B11/0033—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using accumulators with a mechanical spring

Definitions

  • the invention relates to a piston pump according to the preamble of claim 1.
  • intake wind boilers To dampen vibrations in the intake pipes, it is known to use so-called intake wind boilers.
  • these suction wind boilers have the disadvantage that they require an enormous size in order to ensure an acceptable balance between the flow velocity of the sucked-in and the discharged liquid. Furthermore, they become ineffective in high vacuum ventilation with subsequent pressure filling.
  • FR-A-2 305 614 discloses a piston pump provided with a damping element.
  • the tubular damping element either contains a closed, gas-filled chamber or it is made of foam.
  • the tubular damping element is fitted in one piece over the outer circumference of a ring filter element inserted into the pump chamber, the pressure medium being able to be pumped via a suction chamber located outside the ring filter element into the pressure chamber (working chamber) inside the ring filter element and thus to a pressure line connected to a consumption.
  • the aim of the invention is therefore to provide noise damping for piston pumps which is characterized by a particularly small space requirement with the best possible damping properties, can be realized in a cost-effective manner with simple means and is easy to maintain and is suitable for use in pumps which are vacuum-vented before the pressure filling.
  • the invention is based on a damping element which is designed as an annularly closed rubber hose.
  • a damping element which is designed as an annularly closed rubber hose.
  • This allows a large damping area to be achieved, the damping element being inserted particularly well in the suction space in a pressure-tight manner by means of a connector which can be inserted into both ends of the damping hose and is positioned on a ring filter element for guidance and for the purpose of defined deformability.
  • Web-shaped holding arms are provided on the filter element, which partially grip the damping element at a radial distance with almost the same spacing. This ensures simple assembly, disassembly and thus quick interchangeability.
  • Fig. 1 shows schematically a radial piston pump 1 which is flanged to an electric motor.
  • the radial piston pump 1 conveys liquid from a container into the pressure line 5 via the suction chamber 3 and the suction line 4.
  • an elastically deformable molded part 6 is arranged in the suction chamber 3, which consists of a foamed material with closed air or gas bubbles .
  • the geometry of this molded part 6 depends on the special spatial conditions in the suction area of the pump. Instead of a foamed material, a molded part can also be used which instead of the many bubbles has only one or more specially designed air or gas chambers.
  • FIG. 2 shows an annular circumferential damping hose 9 arranged in the suction chamber 3, which is fixed by the annular filter element 10 likewise arranged in the suction chamber 3.
  • the filter element 10 is provided with a plurality of holding arms 11 distributed over the circumference of the filter element, which partially surround the damping hose 9 and thus clamp it between the filter element 10 and the adjacent wall in the housing 12.
  • the damping hose 9 is designed as a component which is plugged together at its two ends, or it can be composed of a plurality of segments which are each inserted into one another.
  • Fig. 3 shows an overall view of the gas-filled damping hose 9, according to which in the region of the partial section the obtuse-angled connector 13 inserted into the two ends of the hose seals the gas-impermeable chamber 8 in the damping hose 9 in a pressure-tight manner.
  • the damping hose 9 is preferably made of rubber, so that the pretensioning force of the expanded rubber keeps the two hose ends secured against displacement on the truncated cone-shaped connecting piece 13 on both sides.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pipe Accessories (AREA)
  • Compressor (AREA)
  • Reciprocating Pumps (AREA)

Abstract

To obtain a compact, silently operating piston pump with at least one delivery piston, which drives the pressurized fluid from an inlet chamber (3) through a working chamber into a power take-off, elastic damping elements (6, 7, 9) which compensate the pressure pulses arising are arranged in the inlet chamber.

Description

Die Erfindung betrifft eine Kolbenpumpe nach dem Oberbegriff des Anspruchs 1.The invention relates to a piston pump according to the preamble of claim 1.

Bei derartigen Pumpen enstehen unerwünschte Geräusche durch Druckpulsation. Zur Geräuschdämpfung ist aus der DE AS 28 24 239 bekannt, das Druckmittel von der Arbeitskammer zum Druckanschluß über einen Sammelraum zu führen, der als Schwingungstilger wirkt.In pumps of this type, undesirable noises occur due to pressure pulsation. For noise damping, it is known from DE AS 28 24 239 to guide the pressure medium from the working chamber to the pressure connection via a collecting space, which acts as a vibration damper.

Zur Dämpfung von Schwingungen in den Ansaugleitungen ist es bekannt, sog. Ansaugwindkessel zu verwenden. Diese Ansaugwindkessel haben jedoch den Nachteil, daß sie, um einen akzeptablen Ausgleich zwischen der Strömungsgeschwindigkeit der angesaugten und der abgegebenen Flüssigkeit zu gewährleisteten, eine enorme Baugröße erfordern. Ferner werden sie bei Hochvakuumentlüftung mit anschließender Druckbefüllung unwirksam.To dampen vibrations in the intake pipes, it is known to use so-called intake wind boilers. However, these suction wind boilers have the disadvantage that they require an enormous size in order to ensure an acceptable balance between the flow velocity of the sucked-in and the discharged liquid. Furthermore, they become ineffective in high vacuum ventilation with subsequent pressure filling.

Aus der FR-A-2 305 614 geht eine mit einem Dämpfungselement versehene Kolbenpumpe hervor. Das schlauchförmige Dämpfungselement enthält entweder eine geschlossene, gasgefüllte Kammer oder es besteht aus Schaumstoff. Das schlauchförmige Dämpfungselement ist einstückig über den Außenumfang eines in den Pumpenraum eingesetzten Ringfilterelementes gestülpt, wobei das Druckmittel über einen außerhalb des Ringfilterelementes gelegenen Ansaugraum in den innerhalb des Ringfilterelementes befindlichen Druckraum (Arbeitskammer) und damit zu einer an einem Verbrauch angeschlossenen Druckleitung gepumpt werden kann.FR-A-2 305 614 discloses a piston pump provided with a damping element. The tubular damping element either contains a closed, gas-filled chamber or it is made of foam. The tubular damping element is fitted in one piece over the outer circumference of a ring filter element inserted into the pump chamber, the pressure medium being able to be pumped via a suction chamber located outside the ring filter element into the pressure chamber (working chamber) inside the ring filter element and thus to a pressure line connected to a consumption.

Ziel der Erfindung ist es daher, eine Geräuschdämpfung für Kolbenpumpen zu schaffen, die sich durch besonders geringen Platzbedarf bei bestmöglichen Dämpfungseigenschaften auszeichnet, mit einfachen Mitteln kostensparend realisierbar sowie wartungsfreundlich ist und dabei für den Einsatz bei Pumpen geeignet ist, die vor der Druckbefüllung vakuumentlüftet werden.The aim of the invention is therefore to provide noise damping for piston pumps which is characterized by a particularly small space requirement with the best possible damping properties, can be realized in a cost-effective manner with simple means and is easy to maintain and is suitable for use in pumps which are vacuum-vented before the pressure filling.

Diese Aufgabe wird erfindungsgemäß durch die den Patentanspruch 1 kennzeichnenden Merkmale gelöst.This object is achieved by the features characterizing claim 1.

Folglich geht die Erfindung von einem Dämpfungselement aus, das als ringförmig geschlossener Gummischlauch ausgebildet ist. Hierdurch läßt sich eine große Dämpfungsfläche erzielen, wobei das Dämpfungselement besonders gut mittels eines in beide Enden des Dämpfungsschlauches einfügbaren Verbindungsstück druckmitteldicht im Ansaugraum eingefügt ist und zur Führung und zum Zwecke einer definierten Verformbarkeit an einem Ringfilterelement positioniert ist. Am Filterelement sind stegförmig ausgebildete Haltearme vorgesehen , die teilgreifend in einem radialen Abstand mit nahezu gleicher Abstandsteilung das Dämpfungselement aufnehmen. Hierdurch ist eine einfache Montage, Demontage und somit schnellte Austauschbarkeit gewährleistet.Consequently, the invention is based on a damping element which is designed as an annularly closed rubber hose. This allows a large damping area to be achieved, the damping element being inserted particularly well in the suction space in a pressure-tight manner by means of a connector which can be inserted into both ends of the damping hose and is positioned on a ring filter element for guidance and for the purpose of defined deformability. Web-shaped holding arms are provided on the filter element, which partially grip the damping element at a radial distance with almost the same spacing. This ensures simple assembly, disassembly and thus quick interchangeability.

Weitere vorteilhafte Merkmale, sowie die Funktion der Erfindung ergeben sich aus der nachstehenden Beschreibung anhand den Zeichnungen.Further advantageous features, as well as the function of the invention result from the following description with reference to the drawings.

Hierzu zeigt:

  • Fig. 1 den prinzipiellen Aufbau einer Pumpen-Ausführungsform gemäß dem Stand der Technik,
  • Fig. 2 ein konkretes Ausführungsbeispiel des Erfindungsgegenstandes und
  • Fig. 3 eine Gesamtansicht des als Dämpfungsschlauch ausgebildeten Dämpfungselementes mit im Teilschnitt dargestellten Verbindungsstück.
This shows:
  • 1 shows the basic structure of a pump embodiment according to the prior art,
  • Fig. 2 shows a concrete embodiment of the subject matter of the invention and
  • Fig. 3 is an overall view of the damping element designed as a damping hose with a connector shown in partial section.

Fig. 1 zeigt schematisch eine radiale Kolbenpumpe 1, die an einem Elektromotor angeflanscht ist. Die Radialkolbenpumpe 1 fördert über den Ansaugraum 3 und die Saugleitung 4 Flüssigkeit aus einem Behälter in die Druckleitung 5. Zum Kompensieren der Pulsation des Ansaugdruckes ist im Ansaugraum 3 ein elastisch verformbares Formteil 6 angeordnet, das aus einem geschäumten Werkstoff mit geschlossenen Luft- oder Gasblasen besteht. Die Geometrie dieses Formteiles 6 richtet sich nach den speziellen Raumverhältnissen im Saugbereich der Pumpe. Statt einem geschäumten Werkstoff kann auch ein Formteil verwandt werden, das statt der vielen Blasen nur eine oder mehrere speziell ausgebildete Luft- bzw. Gaskammern aufweist.Fig. 1 shows schematically a radial piston pump 1 which is flanged to an electric motor. The radial piston pump 1 conveys liquid from a container into the pressure line 5 via the suction chamber 3 and the suction line 4. To compensate for the pulsation of the suction pressure, an elastically deformable molded part 6 is arranged in the suction chamber 3, which consists of a foamed material with closed air or gas bubbles . The geometry of this molded part 6 depends on the special spatial conditions in the suction area of the pump. Instead of a foamed material, a molded part can also be used which instead of the many bubbles has only one or more specially designed air or gas chambers.

Die in Fig. 2 dargestellte, erfindungsgemäße Ausführungsform zeigt einen im Ansaugraum 3 angeordneten, ringförmig umlaufenden Dämpfungsschlauch 9, der durch das ebenfalls im Ansaugraum 3 angeordnete, ringförmige Filterelement 10 fixiert ist. Hierzu ist das Filterelement 10 mit mehreren, über den Umfang des Filterelementes verteilte Haltearme 11 versehen, die den Dämpfungsschlauch 9 teilweise umgeben und ihn so zwischen dem Filterelement 10 und der angrenzenden Wand im Gehäuse 12 einspannen. Der Dämpfungsschlauch 9 ist als ein an seinen beiden Enden zusammengestecktes Bauteil ausgeführt, oder er kann aus mehreren Segmenten, die jeweils ineinandergesteckt sind, zusammengesetzt sein.The embodiment according to the invention shown in FIG. 2 shows an annular circumferential damping hose 9 arranged in the suction chamber 3, which is fixed by the annular filter element 10 likewise arranged in the suction chamber 3. For this purpose, the filter element 10 is provided with a plurality of holding arms 11 distributed over the circumference of the filter element, which partially surround the damping hose 9 and thus clamp it between the filter element 10 and the adjacent wall in the housing 12. The damping hose 9 is designed as a component which is plugged together at its two ends, or it can be composed of a plurality of segments which are each inserted into one another.

Fig. 3 zeigt eine Gesamtansicht des gasgefüllten Dämpfungsschlauches 9, wonach im Bereich des Teilschnittes das stumpfwinklig abgekröpfte, in die beiden Enden des Schlauches eingefügte Verbindungsstück 13 druckmitteldicht die gasundurchlässige Kammer 8 im Dämpfungsschlauch 9 verschließt. Der Dämpfungsschlauch 9 ist vorzugsweise aus Gummi hergestellt, so daß die Vorspannkraft des aufgeweiteten Gummis die beiden Schlauchenden auf den beidseitig kegelstumpfförmig angefasten Verbindungsstück 13 verschiebegesichert hält.Fig. 3 shows an overall view of the gas-filled damping hose 9, according to which in the region of the partial section the obtuse-angled connector 13 inserted into the two ends of the hose seals the gas-impermeable chamber 8 in the damping hose 9 in a pressure-tight manner. The damping hose 9 is preferably made of rubber, so that the pretensioning force of the expanded rubber keeps the two hose ends secured against displacement on the truncated cone-shaped connecting piece 13 on both sides.

Bezugszeichenliste:Reference symbol list:

11
RadialkolbenpumpeRadial piston pump
22nd
ElektromotorElectric motor
33rd
AnsaugraumIntake space
44th
SaugleitungSuction line
55
DruckleitungPressure line
66
FormteilMolding
88th
Kammerchamber
99
DämpfungsschlauchDamping hose
1010th
FilterelementFilter element
1111
HaltearmHolding arm
1212
Gehäusecasing
1313
VerbindungsstückConnector

Claims (7)

  1. A piston pump (1) having at least one delivery plunger delivering pressure fluid from a suction chamber (3) via a working chamber into a pressure port, comprising an elastomeric damping element (9) arranged in the suction chamber and being formed by a deformable damping hose (9) of preferably annular closed configuration, the said damping hose (9) containing at least one closed gas-filled compartment,
    characterised in that the compartment is closable pressure-fluid-tightly by a connecting portion (13) which can be inserted into the two ends of the damping hose (9), in that the external diameter of the damping hose (9) is coacting with a plurality of retaining arms (11) which are distributed over the periphery of a filter element (10) and which extend substantially in axial direction, and in that the retaining arms (11) of the filter element (10) embrace the damping hose (9) partly in radial direction.
  2. A piston pump as claimed in claim 1,
    characterised in that the connecting portion (13) of the damping hose (9) has a circular cross-section and is bent preferably at an obtuse angle.
  3. A piston pump as claimed in claim 1 or 2,
    characterised in that the external diameter of the connecting portion (13) mirror-symmetrically is larger than the internal diameter of the damping hose (9) by an identical length to be inserted into the damping hose (9) on either side of its angled-off portion.
  4. A piston pump as claimed in at least one of the preceding claims,
    characterised in that the external diameter of the connecting portion (13) by approximation corresponds to the external diameter of the damping hose (9).
  5. A piston pump as claimed in at least one of the preceding claims,
    characterised in that the filter element (10) cooperates with the damping hose (9) in the suction chamber (3) of the pump.
  6. A piston pump as claimed in at least one of the preceding claims,
    characterised in that the filter element (10) is conformed to the shape of the damping hose and can be penetrated by fluid in radial direction.
  7. A piston pump as claimed in at least one of the claims 1 to 6,
    characterised in that the damping hose (9), at its periphery, is in partially supporting contact with a wall confining the suction chamber (3).
EP89907131A 1988-07-07 1989-06-16 Piston pump Expired - Lifetime EP0378629B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3822988 1988-07-07
DE3822988 1988-07-07
DE3914954 1989-05-06
DE3914954A DE3914954A1 (en) 1988-07-07 1989-05-06 PISTON PUMP

Publications (2)

Publication Number Publication Date
EP0378629A1 EP0378629A1 (en) 1990-07-25
EP0378629B1 true EP0378629B1 (en) 1993-04-28

Family

ID=25869828

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89907131A Expired - Lifetime EP0378629B1 (en) 1988-07-07 1989-06-16 Piston pump

Country Status (5)

Country Link
US (2) US5030070A (en)
EP (1) EP0378629B1 (en)
JP (1) JPH03500326A (en)
DE (2) DE3914954A1 (en)
WO (1) WO1990000682A1 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5516266A (en) * 1993-09-07 1996-05-14 Walbro Corporation Fuel pump tubular pulse damper
DE4419758A1 (en) * 1994-06-06 1995-12-07 Teves Gmbh Alfred Electric motor with radial sliding surfaces for armature shaft
US5860799A (en) * 1997-02-27 1999-01-19 Sealand Technology, Inc. Pulsation damper for marine tank pumpout systems
DE19756727A1 (en) * 1997-11-07 1999-05-12 Itt Mfg Enterprises Inc Piston pump
EP2191104B1 (en) * 2007-08-30 2019-12-04 Micropump. Inc. Pumps and pump-heads comprising internal pressure-absorbing member
DE102015215478A1 (en) * 2015-08-13 2017-02-16 Mahle International Gmbh Pumping device, in particular axial piston pump, for a waste heat utilization device of a motor vehicle
DE102015215477A1 (en) * 2015-08-13 2017-02-16 Mahle International Gmbh Pumping device, in particular axial piston pump, for a waste heat utilization device of a motor vehicle
US10883497B2 (en) 2016-11-11 2021-01-05 Micropump, Inc., A Unit Of Idex Corporation Systems and methods of securing a compliant member in a pump
DE102018212221A1 (en) * 2018-07-23 2020-01-23 Continental Automotive Gmbh Pump for a motor vehicle

Family Cites Families (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7416426U (en) * 1974-10-10 Fichtel & Sachs Ag high pressure pump
US2311916A (en) * 1939-06-24 1943-02-23 Gunnar A Wahlmark Fuel pump
DE223130C (en) * 1940-07-16 1910-06-15 Erik Anton Rundlöf REGULATING DEVICE FOR FUEL PUMPS
US2473726A (en) * 1946-12-28 1949-06-21 Harvey Payne & Co W Electric pump
US2557247A (en) * 1948-03-11 1951-06-19 Ziherl Frank Double-action sprayer
US2873688A (en) * 1955-11-18 1959-02-17 Gen Motors Corp Pump with oblique pulsator diaphragm
US3146724A (en) * 1961-11-20 1964-09-01 Armco Steel Corp Pumps with pulsation damper
AT277435B (en) * 1966-02-11 1969-12-29 Hoerbiger Ventilwerke Ag Device for stepless regulation of the delivery quantity of reciprocating compressors
US3366067A (en) * 1966-04-25 1968-01-30 Kocolowski Michael Pump assembly
DE2513010C3 (en) * 1975-03-25 1980-08-28 Danfoss A/S, Nordborg (Daenemark) oil pump for firing systems
DE7618432U1 (en) * 1976-06-10 1976-10-07 Wepuko-Hydraulik Gmbh, 7418 Metzingen HIGH PRESSURE PISTON PUMP
FR2499651B1 (en) * 1981-02-11 1986-09-05 Poclain Hydraulics Sa HYDRAULIC HOUSING MECHANISM PROVIDED WITH A PRESSURE VARIATION DAMPER INSIDE THE HOUSING
FR2517378B1 (en) * 1981-11-28 1988-03-11 Becker Erich MEMBRANE PUMP
DE3210110A1 (en) * 1981-11-28 1983-06-01 Erich 7812 Bad Krozingen Becker Diaphragm pump
DE8205932U1 (en) * 1982-03-04 1982-07-08 Pumpenfabrik Urach, 7432 Urach PISTON PUMP WITH PULSATION DAMPER ARRANGEMENT
US4641860A (en) * 1984-06-25 1987-02-10 Berkley And Company, Inc. Coupling for flexible tubing
US4629562A (en) * 1985-08-06 1986-12-16 Scientific Systems, Inc. Pulse dampener
DE3718777A1 (en) * 1986-06-07 1987-12-17 Mitsuba Electric Mfg Co PULSATION PROTECTION ELEMENT FOR A PUMP

Also Published As

Publication number Publication date
US5141415A (en) 1992-08-25
DE3914954A1 (en) 1990-01-11
WO1990000682A1 (en) 1990-01-25
DE58904213D1 (en) 1993-06-03
EP0378629A1 (en) 1990-07-25
US5030070A (en) 1991-07-09
JPH03500326A (en) 1991-01-24

Similar Documents

Publication Publication Date Title
EP0378629B1 (en) Piston pump
EP0401320B1 (en) Hydraulic pump
EP0787607B1 (en) Sound damping device
EP0569875B1 (en) Hose pump
CH628116A5 (en) Submersible pump, especially drum pump
EP0011189A1 (en) Device with a membrane for damping oscillations in flowing liquids
DE102005035726A1 (en) linear pump
AT522171A4 (en) cooler
DE2053945B2 (en) ONE-PIECE WALL CONNECTOR FOR WATER OUTLET FITTINGS
DE4302977A1 (en) Hydraulic plant with pump or motor - generates 180 deg. phase-displaced compensation wave against uneven surface of pressure medium flow
DE3804217A1 (en) AXIAL FAN
EP0092827B1 (en) Pressure monitoring device for incorporation in a pipe or hose
EP0921299B1 (en) Device for sealing a fuel pumping device in a fuel tank
DE4142268C2 (en) Fuel delivery system
DE3735081A1 (en) Pressure-pulsation damper for flow media
EP2430968B1 (en) Water-guiding household appliance, in particular dishwashers
DE2822615A1 (en) Shock absorber rod seal - has sealing rings with lips around piston rod, connected to rod guide as one assembly
DE2937403A1 (en) Stator for eccentric-screw pump - comprises rubber or elastomer moulding with integral seals which overlap housing ends
DE2633781B2 (en) Centrifugal fan with high pressure factor
DE19846189A1 (en) Friction vacuum pump
EP0065693B1 (en) Compressor plant
DE19941594A1 (en) Constriction or blocking element for conduits of fluid media comprises an elastically compliant tube and at least one magnet capable of deforming the tube so that the flow cross section is either decreased or increased
DE916250C (en) Sealing between two telescopically arranged tubes
DE3710452A1 (en) Mounting for the fastening of a lower liquid-pump
DE4110833C2 (en) Boiler feed pump in pot housing design

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19900112

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB

17Q First examination report despatched

Effective date: 19910524

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB

REF Corresponds to:

Ref document number: 58904213

Country of ref document: DE

Date of ref document: 19930603

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19930528

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20010522

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20010619

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20010621

Year of fee payment: 13

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20020616

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20030101

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20020616

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20030228

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST