EP0711923B1 - Electric motor-driven air pump - Google Patents

Electric motor-driven air pump Download PDF

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Publication number
EP0711923B1
EP0711923B1 EP95111114A EP95111114A EP0711923B1 EP 0711923 B1 EP0711923 B1 EP 0711923B1 EP 95111114 A EP95111114 A EP 95111114A EP 95111114 A EP95111114 A EP 95111114A EP 0711923 B1 EP0711923 B1 EP 0711923B1
Authority
EP
European Patent Office
Prior art keywords
pump
electric motor
pump cover
plastic
air pump
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
EP95111114A
Other languages
German (de)
French (fr)
Other versions
EP0711923A1 (en
Inventor
Frank Kemmerling
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.)
Pierburg GmbH
Original Assignee
Pierburg 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 Pierburg GmbH filed Critical Pierburg GmbH
Publication of EP0711923A1 publication Critical patent/EP0711923A1/en
Application granted granted Critical
Publication of EP0711923B1 publication Critical patent/EP0711923B1/en
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
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/02—Selection of particular materials
    • F04D29/023—Selection of particular materials especially adapted for elastic fluid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/4226—Fan casings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/668—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps damping or preventing mechanical vibrations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/40—Organic materials
    • F05D2300/43—Synthetic polymers, e.g. plastics; Rubber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/70—Treatment or modification of materials
    • F05D2300/702—Reinforcement
    • 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
    • Y10S415/00—Rotary kinetic fluid motors or pumps
    • Y10S415/915—Pump or portion thereof by casting or molding

Definitions

  • the invention relates to an electrically driven air pump, for example for Motor vehicles in which so-called secondary air is conveyed into the exhaust pipe system should be to improve the exhaust gas values.
  • the invention has for its object an air pump with reduced To create running noise, spraying a metal reinforcement with the Pump cover wall should be possible.
  • FIG. 1 shows the air pump 1 according to the invention, consisting of a plastic Manufactured housing 2, which houses a pump unit 3 on the one hand and on the other hand an electric motor 4.
  • the housing 1 is on the electric motor side by a cover 5 closed and has led out electrical connection cable 6 for the Electric motor 4.
  • the pump station side is closed by a pump cover 7, which has an air supply connection 8.
  • a stator 9 having guide channels 10 with which in turn the air conveyed by a first impeller 11 from the outer impeller outlet 12 the inner impeller inlet 13 of a further impeller 14 is supplied.
  • the Housing 2 has an annular channel 15 in the area of the last impeller 14, in which the air exits the impeller 14 and is led to a pressure connection.
  • the two impellers 11, 14 are with their hubs 16 on a shaft 17 of the Fixed electric motor 4, which protrudes into the pump station side.
  • the electric motor 4 is in a recess by means of a first elastomer ring 18 19 a housing wall separating the pump station side from the electric motor side 20 and a second elastomer ring 21 held.
  • the pump cover made of plastic 7 a metal reinforcement 23 sprayed with an axial wall 22 of the pump cover 7 has, with its outer surface or its edge 24 made of plastic or the pump cover wall protrudes and its inner jacket surface or inner edge 25 interrupted by a plurality of openings 26 arranged in a star shape is, as can be seen from Figure 2, a view of the metal reinforcement 23 from Figure 1 shows.
  • openings 26 are filled with plastic during the pressure spraying process form plastic walls 27 that exist on both sides of the metal reinforcement 23 Connect axial walls 28, 29 of the axial wall 22.
  • the one after the spraying process shrinking process of the plastic against the metal can now take place without Stress build up because the outer edge 24 of the metal reinforcement 23 from the Plastic or the pump cover wall can slide out and also the between the openings 26 existing plastic walls 27 from the star shape arranged openings 26.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Compressor (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Details Of Reciprocating Pumps (AREA)

Description

Die Erfindung betrifft eine elektrisch angetriebene Luftpumpe, beispielsweise für Kraftfahrzeuge, bei denen sogenannte Sekundärluft in das das Abgasrohrsystem gefördert werden soll, um die Abgaswerte zu verbessern.The invention relates to an electrically driven air pump, for example for Motor vehicles in which so-called secondary air is conveyed into the exhaust pipe system should be to improve the exhaust gas values.

Bei einer derartigen Pumpe (EPA 0 385 298 A2) besteht das Problem, daß ihr Betrieb aufgrund von Unwuchten des Laufrades und des Elektromotors sowie des entstehenden magnetischen Drehfeldes unvermeidbar mit mehr oder weniger Vibrationen verbunden ist, die sich auf die Einrichtung, an der die Pumpe angeschlossen ist bzw. an der sie befestigt ist, übertragen und ein Laufgeräusch verursachen.The problem with such a pump (EPA 0 385 298 A2) is that its operation due to imbalance of the impeller and the electric motor as well as the resulting magnetic rotating field inevitable with more or less vibrations connected to the device to which the pump is connected or to which it is attached, transmit and cause running noise.

Aus der DE-A1 41 07 049 ist eine gattungsgemäße Luftpumpe bekannt, die mit Merkmalen ausgestattet ist, mit denen eine Verringerung der Vibrationen und der Laufgeräusche erzielt werden soll.From DE-A1 41 07 049 a generic air pump is known, which with Features that reduce vibration and vibration Running noise should be achieved.

Es hat sich nun gezeigt, daß diese Maßnahmen insgesamt zu einer Verringerung der Vibrationen und der Laufgeräusche führen, wobei jedoch durch die Membranwirkung eines bei der vorliegenden Ausführung einen Luftzufuhranschluß aufweisenden und aus Kunststoff bestehenden Pumpendeckels im Zusammenwirken mit weiteren Bauteilen ein niederfrequentes Laufgeräusch verbleibt.It has now been shown that these measures lead to a reduction in the overall Vibrations and the running noise cause, however, by the membrane effect one in the present embodiment having an air supply connection and Pump cover made of plastic in cooperation with others Components a low-frequency running noise remains.

Dieses niederfrequente Laufgeräusch wurde dadurch beseitigt, daß die Axialwand des Pumpendeckels durch eine Metallarmierung versteift wurde. Hierbei konnte jedoch als einzige gangbare Lösung nur ein Vernieten der Metallarmierung mit dem Pumpendeckel gefunden werden, da ein Verspritzen der Metallarmierung mit dem Pumpendeckel wegen unterschiedlicher Temperaturausdehnung der Materialien als nicht durchführbar angesehen wurde. Diese Verbindungsart ist jedoch fertigungstechnisch aufwendig und beseitigt nicht restlos durch Temperaturunterschiede verursachte Temperaturspannungen zwischen Pumpendeckel und Metallarmierung, die zu einem Versagen der Pumpe führen können.This low-frequency running noise was eliminated by the fact that the axial wall of the Pump cover was stiffened by a metal reinforcement. Here, however, as only viable solution just riveting the metal reinforcement to the Pump covers can be found because the metal reinforcement is sprayed with the Pump cover as a result of different temperature expansion of the materials was not considered feasible. However, this type of connection is elaborate in terms of production technology and not completely eliminated by temperature differences caused temperature tensions between the pump cover and the metal reinforcement can cause the pump to fail.

Der Erfindung liegt die Aufgabe zugrunde, eine Luftpumpe mit verringertem Laufgeräusch zu schaffen, wobei ein Verspritzen einer Metallarmierung mit der Pumpendeckelwand möglich werden soll.The invention has for its object an air pump with reduced To create running noise, spraying a metal reinforcement with the Pump cover wall should be possible.

Diese Aufgabe ist bei der angegebenen Luftpumpe durch die im Kennzeichen des Patentanspruchs angegebenen Merkmale gelöst worden.This task is in the specified air pump by the in the characterizing part of the claim specified features have been resolved.

Mit der Erfindung erzielbare Vorteile sind in der nachfolgenden Beschreibung eines Ausführungsbeispiels der Erfindung angegeben, das in der Zeichnung dargestellt ist.Advantages achievable with the invention are in the following description of a Embodiment of the invention specified, which is shown in the drawing.

Diese zeigt:

  • Figur 1
    ein Ausführungsbeispiel nach der Erfindung;
  • Figur 2
    eine Einzelheit aus Figur 1.
    • This shows:
  • Figure 1
    an embodiment according to the invention;
  • Figure 2
    a detail from Figure 1.

    • Figur 1 zeigt die erfindungsgemäße Luftpumpe 1, bestehend aus einem in Kunststoff gefertigten Gehäuse 2, das einerseits ein Pumpenwerk 3 aufnimmt und andererseits einen Elektromotor 4. Das Gehäuse 1 ist auf der Elektromotorseite von einem Deckel 5 verschlossen und weist herausgeführte elektrische Anschlußkabel 6 für den Elektromotor 4 auf. Die Pumpenwerkseite ist von einem Pumpendeckel 7 verschlossen, der einen Luftzuführanschluß 8 aufweist. Zwischen Pumpendeckel 7 und Gehäuse 2 ist bei dieser Luftpumpe 1 ein Leitrad 9 eingesetzt, das Leitkanäle 10 aufweist, mit denen die von einem 1. Laufrad 11 geförderte Luft vom äußeren Laufradaustritt 12 wiederum dem inneren Laufradeintritt 13 eines weiteren Laufrades 14 zugeführt wird. Das Gehäuse 2 weist im Bereich des letzten Laufrades 14 einen ringförmigen Kanal 15 auf, in den die Luft aus dem Laufrad 14 austritt und zu einem Druckanschluß geführt wird. Figure 1 shows the air pump 1 according to the invention, consisting of a plastic Manufactured housing 2, which houses a pump unit 3 on the one hand and on the other hand an electric motor 4. The housing 1 is on the electric motor side by a cover 5 closed and has led out electrical connection cable 6 for the Electric motor 4. The pump station side is closed by a pump cover 7, which has an air supply connection 8. Between pump cover 7 and housing 2 is used in this air pump 1, a stator 9 having guide channels 10 with which in turn the air conveyed by a first impeller 11 from the outer impeller outlet 12 the inner impeller inlet 13 of a further impeller 14 is supplied. The Housing 2 has an annular channel 15 in the area of the last impeller 14, in which the air exits the impeller 14 and is led to a pressure connection.

    Die beiden Laufräder 11, 14 sind mit ihren Naben 16 auf einer Welle 17 des Elektromotors 4 befestigt, die in die Pumpenwerkseite hineinragt.The two impellers 11, 14 are with their hubs 16 on a shaft 17 of the Fixed electric motor 4, which protrudes into the pump station side.

    Der Elektromotor 4 ist mittels eines ersten Elastomerringes 18 in einer Ausnehmung 19 einer die Pumpenwerkseite von der Elektromotorseite trennenden Gehäusewand 20 und eines zweiten Elastomerringes 21 gehalten.The electric motor 4 is in a recess by means of a first elastomer ring 18 19 a housing wall separating the pump station side from the electric motor side 20 and a second elastomer ring 21 held.

    Erfindungsgemäß ist vorgesehen, daß der aus Kunststoff bestehende Pumpendeckel 7 eine mit einer Axialwand 22 des Pumpendeckels 7 verspritzte Metallarmierung 23 aufweist, die mit ihrer äußeren Mantelfläche bzw. ihrem Rand 24 aus dem Kunststoff bzw. der Pumpendeckelwandung herausragt und deren innere Mantelfäche bzw. innerer Rand 25 durch mehrere sternförmig angeordnete Durchbrüche 26 unterbrochen ist, wie aus der Figur 2 ersichtlich ist, die eine Ansicht der Metallarmierung 23 aus Figur 1 zeigt.According to the invention it is provided that the pump cover made of plastic 7 a metal reinforcement 23 sprayed with an axial wall 22 of the pump cover 7 has, with its outer surface or its edge 24 made of plastic or the pump cover wall protrudes and its inner jacket surface or inner edge 25 interrupted by a plurality of openings 26 arranged in a star shape is, as can be seen from Figure 2, a view of the metal reinforcement 23 from Figure 1 shows.

    Diese Durchbrüche 26 werden beim Druckspritzvorgang mit Kunststoff gefüllt und bilden Kunststoffwände 27, die beiderseits der Metallarmierung 23 bestehende Axialwände 28, 29 der Axialwand 22 verbinden. Der nach dem Spritzvorgang stattfindende Schrumpfvorgang des Kunststoffs gegenüber dem Metall kann nun ohne Spannungsaufbau erfolgen, da der äußere Rand 24 der Metallarmierung 23 aus dem Kunststoff bzw. der Pumpendeckelwandung herausgleiten kann und ebenso die zwischen den Durchbrüchen 26 bestehenden Kunststoffwände 27 aus den sternförmig angeordneten Durchbrüchen 26.These openings 26 are filled with plastic during the pressure spraying process form plastic walls 27 that exist on both sides of the metal reinforcement 23 Connect axial walls 28, 29 of the axial wall 22. The one after the spraying process shrinking process of the plastic against the metal can now take place without Stress build up because the outer edge 24 of the metal reinforcement 23 from the Plastic or the pump cover wall can slide out and also the between the openings 26 existing plastic walls 27 from the star shape arranged openings 26.

    Bei einer nach der ersten Abkühlung erfolgenden Erwärmung des Pumpendeckels 7 erfolgt eine Kunststoffausdehnung innerhalb des Freiraumes, der beim ersten Schrumpfen nach dem Druckspritzvorgang entstanden ist. When the pump cover 7 is heated after the first cooling there is a plastic expansion within the free space, the first Shrinkage has occurred after the pressure spraying process.

    Mit der Erfindung wurde eine kostensparende Anordnung der Metallarmierung gefunden, wobei diese gegenüber einer genieteten Ausführung größere Toleranzen aufweisen kann, da diese durch die Axialwände 28, 29 des Pumpendeckels 7 kompensiert werden, und Funktionsvorteile.With the invention, a cost-saving arrangement of the metal reinforcement found, these being larger tolerances compared to a riveted version can have, since this through the axial walls 28, 29 of the pump cover 7th be compensated, and functional advantages.

    Claims (1)

    1. Electrically driven air pump (1), comprising a housing (2) with a pump unit (3) arranged on one side and electric motor (4) arranged on the other side, wherein the pump side of the housing is closed by a pump cover (7), characterized in that the pump cover (7) comprising plastic has a metal reinforcement (23) moulded with an axial wall (22) of the pump cover (7) which projects out of the plastic and/or the pump cover walling with its outer lateral surface and/or its edge (24) and whose inner lateral surface and/or inner edge (25) is interrupted by several openings (26) arranged in a star shape.
    EP95111114A 1994-10-29 1995-07-15 Electric motor-driven air pump Expired - Lifetime EP0711923B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE4438751 1994-10-29
    DE4438751A DE4438751A1 (en) 1994-10-29 1994-10-29 Electrically powered air pump

    Publications (2)

    Publication Number Publication Date
    EP0711923A1 EP0711923A1 (en) 1996-05-15
    EP0711923B1 true EP0711923B1 (en) 1998-04-01

    Family

    ID=6532054

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP95111114A Expired - Lifetime EP0711923B1 (en) 1994-10-29 1995-07-15 Electric motor-driven air pump

    Country Status (4)

    Country Link
    US (1) US5823753A (en)
    EP (1) EP0711923B1 (en)
    DE (2) DE4438751A1 (en)
    ES (1) ES2114251T3 (en)

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    Publication number Priority date Publication date Assignee Title
    US6270310B1 (en) 1999-09-29 2001-08-07 Ford Global Tech., Inc. Fuel pump assembly
    US6604917B2 (en) * 2000-10-06 2003-08-12 Torrington Research Company Light-weight electric motor driven fluid pump assembly
    WO2009006385A1 (en) * 2007-07-02 2009-01-08 Borgwarner Inc. Inlet design for a pump assembly
    CN101560993A (en) * 2009-04-04 2009-10-21 李家林 Multifunctional cover plate and impeller pump chamber
    US8974197B2 (en) * 2010-02-16 2015-03-10 Halla Visteon Climate Control Corporation Compact structure for an electric compressor
    ITTO20110188A1 (en) * 2011-03-02 2012-09-03 Denso Thermal Systems Spa ELASTIC INSULATION SYSTEM OF AN ELECTRIC MOTOR TO REDUCE VIBRATION TRANSMISSION
    CN103573671B (en) * 2012-07-27 2017-03-15 富瑞精密组件（昆山）有限公司 Fan base and its manufacture method
    GB2513661B (en) * 2013-05-03 2016-03-16 Dyson Technology Ltd Vibration isolation mount
    CN107120318A (en) 2014-01-03 2017-09-01 北京怡和嘉业医疗科技股份有限公司 Blower fan apparatus and the lung ventilator for including this blower fan apparatus
    JP6470210B2 (en) * 2016-03-15 2019-02-13 日立アプライアンス株式会社 Electric blower for vacuum cleaner and electric vacuum cleaner provided with the same

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    DE2307688A1 (en) * 1973-02-16 1974-08-29 Zimmermann & Jansen Gmbh HOUSING OR CYLINDER WITH WEAR RESISTANT WALLS
    DE2706110C3 (en) * 1977-02-14 1981-07-09 Aktiengesellschaft Kühnle, Kopp & Kausch, 6710 Frankenthal Compressor housing preferably for exhaust gas turbochargers
    SE411571B (en) * 1978-06-16 1980-01-14 Skega Ab wear lining
    US4639191A (en) * 1983-06-01 1987-01-27 R. Leon Wells Centrifugal fan liner and installing tool therefor
    JPS6022500A (en) * 1983-07-15 1985-02-04 Mitsubishi Electric Corp Controller of charging generator
    JPS60225000A (en) * 1984-04-24 1985-11-09 Matsushita Seiko Co Ltd Casing of centrifugal blower
    JP2701057B2 (en) * 1988-02-08 1998-01-21 株式会社荏原製作所 Fully circumferential flow type submersible motor pump made of elastic material
    JPH0765597B2 (en) 1989-03-01 1995-07-19 株式会社日立製作所 Electric blower
    DE4107049C2 (en) 1991-03-06 1997-12-11 Pierburg Ag Electrically powered air pump

    Also Published As

    Publication number Publication date
    EP0711923A1 (en) 1996-05-15
    DE59501774D1 (en) 1998-05-07
    DE4438751A1 (en) 1996-05-02
    US5823753A (en) 1998-10-20
    ES2114251T3 (en) 1998-05-16

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