EP0797004A1 - Electric motor driven air pump - Google Patents

Electric motor driven air pump Download PDF

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Publication number
EP0797004A1
EP0797004A1 EP96118675A EP96118675A EP0797004A1 EP 0797004 A1 EP0797004 A1 EP 0797004A1 EP 96118675 A EP96118675 A EP 96118675A EP 96118675 A EP96118675 A EP 96118675A EP 0797004 A1 EP0797004 A1 EP 0797004A1
Authority
EP
European Patent Office
Prior art keywords
air pump
pump
shaft
electric motor
impellers
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
EP96118675A
Other languages
German (de)
French (fr)
Other versions
EP0797004B1 (en
Inventor
Rainer Peters
Michael Bonse
Günter van de Venne
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 EP0797004A1 publication Critical patent/EP0797004A1/en
Application granted granted Critical
Publication of EP0797004B1 publication Critical patent/EP0797004B1/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
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/08—Centrifugal pumps
    • F04D17/16—Centrifugal pumps for displacing without appreciable compression
    • F04D17/164—Multi-stage fans, e.g. for vacuum cleaners
    • 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
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/263—Rotors specially for elastic fluids mounting fan or blower rotors on shafts
    • 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
    • F05D2230/00—Manufacture
    • F05D2230/20—Manufacture essentially without removing material
    • F05D2230/23—Manufacture essentially without removing material by permanently joining parts together
    • F05D2230/232—Manufacture essentially without removing material by permanently joining parts together by welding
    • F05D2230/234—Laser welding
    • 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
    • F05D2230/00—Manufacture
    • F05D2230/50—Building or constructing in particular ways
    • F05D2230/51—Building or constructing in particular ways in a modular way, e.g. using several identical or complementary parts or features
    • 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
    • F05D2260/00—Function
    • F05D2260/30—Retaining components in desired mutual position
    • F05D2260/36—Retaining components in desired mutual position by a form fit connection, e.g. by interlocking
    • 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
    • F05D2260/00—Function
    • F05D2260/96—Preventing, counteracting or reducing vibration or noise
    • 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

Definitions

  • the invention relates to an electrically driven air pump, for example for motor vehicles, in which so-called secondary air is to be conveyed into the exhaust pipe system in order to improve the exhaust gas values.
  • the object of the invention is to create an air pump with reduced running noise, with a simplified pump structure also being achieved.
  • FIG. 1 shows the air pump according to the invention, consisting of a housing 1 made of plastic, which on the one hand accommodates a pump unit 2 and on the other hand an electric motor 4 in an electric motor chamber 3.
  • the housing 1 is closed on the pump side by a cover 5 which has an intake port 6 having.
  • the pump unit 2 has one or more pump impellers 7, 8 molded from plastic, as a result of which a streamlined shape and a lighter dish than metal can be achieved.
  • the pump impellers 7, 8 are pressed with impeller hubs 9, 10 onto an electric motor shaft 11, the impeller hubs 9, 10 bearing against a shaft collar 12 in the pressing-on direction and secured by an end ring 13 made of metal and pressed onto the shaft 11. So that the relatively smooth plastic does not slide on the shaft 11, it is provided that contacting axial surfaces 14, 15 and 16 of the impellers 7, 8 and the end ring 13 have interlocking teeth 17.
  • the shaft collar 12 is formed by a metal stop ring 18 pressed onto the shaft 11.
  • the measure can be taken that the contacting axial surfaces 15, 19 of the Impeller 8 and the stop ring 18 have an interlocking toothing 20, as shown in Fig. 2, whereby the impellers 7, 8 can be made uniform.
  • the teeth 17 shown in the drawing are each provided by a hub extension 21, interrupted by a hub bore 22 and a hub groove 23, ie one end wall 15 of the pump impeller hub 9 then has the hub extension 21 and the other end wall 16 has the hub groove 23.
  • the stop ring 18 then has a groove 24 and the end ring has a shoulder 25 which are designed in accordance with the hub groove 23 and the hub shoulder 21.
  • the end ring 13 can be connected to the shaft 11 by laser beam welding and can thus be secured against rotation.
  • the air pump according to the invention With the air pump according to the invention, low-noise operation has become possible since lighter pump impellers can now be used.
  • the invention provides a very simple air pump that is inexpensive to manufacture and will have a long service life.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Reciprocating Pumps (AREA)

Abstract

The pump (2) incorporates one or more plastic rotors (7,8) whose hubs (9,10) are pressed on to the shaft (11) of the electric motor (4) as far as a collar (12), and secured in position by a metallic termination ring (13). To prevent the relatively smooth plastics from sliding on the shaft, sets of teeth (17) in mesh are provided on the axial surfaces (14-16) of the rotors. After assembly of these the ring may be secured by laser beam welding.

Description

Die Erfindung betrifft eine elektrisch angetriebene Luftpumpe, beispielsweise für Kraftfahrzeuge, bei denen sogenannte Sekundärluft in 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 to be conveyed into the exhaust pipe system in order 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 hochfrequentes Laufgeräusch verursachen.In such a pump (EPA 0 385 298 A2) there is the problem that its operation is inevitably associated with more or less vibrations due to imbalance of the impeller and the electric motor and the resulting magnetic rotating field, which affects the device on which the pump connected or to which it is attached, and cause high-frequency running noise.

Zur Verminderung dieses Geräusches wurde in der DE-A1 41 07 049.6 bereits vorgeschlagen, daß der Elektromotor mittels zweier elastischer Motorlager zwischen Elektromotor und Gehäuse abgestützt ist. Bei dem in dieser Druckschrift vorgeschlagenen Pumpenlaufrad handelt es sich um ein aus mehreren Teilen zusammengesetztes Laufrad, welches ausgewuchtet werden muß.To reduce this noise, it has already been proposed in DE-A1 41 07 049.6 that the electric motor is supported between the electric motor and the housing by means of two elastic motor bearings. The pump impeller proposed in this publication is an impeller composed of several parts, which must be balanced.

Aus der US-PS 2,857,849 beispielsweise ist eine Pumpenausführung bekannt, bei der mehrere Pumpenlaufräder auf einer Elektromotorwelle befestigt sind, und zwar mittels einer quer zur Pumpenlängsachse in die Pumpenlaufradnabe eingeschraubten Schraube, die gegen die Welle drückt. Daraus, daß das Gewinde für diesen Zweck ausreichend fest sein muß, kann geschlossen werden, daß die Laufräder aus Metall bestehen. Diese sind schwer und weisen Unwuchten auf.From US Pat. No. 2,857,849, for example, a pump version is known in which a plurality of pump impellers are fastened on an electric motor shaft, by means of a screw which is screwed transversely to the longitudinal axis of the pump into the pump impeller hub and presses against the shaft. From the fact that the thread must be sufficiently strong for this purpose, it can be concluded that the impellers are made of metal. These are heavy and have imbalances.

Hiervon ausgehend liegt der Erfindung die Aufgabe zugrunde, eine Luftpumpe mit verringertem Laufgeräusch zu schaffen, wobei darüber hinaus ein vereinfachter Pumpenaufbau erreicht werden soll.Proceeding from this, the object of the invention is to create an air pump with reduced running noise, with a simplified pump structure also being achieved.

Diese Aufgabe ist bei der angegebenen Luftpumpe durch die im Kennzeichen des Patentanspruchs 1 angegebenen Merkmale gelöst worden. Vorteilhafte Weiterbildungen sind mit den Unteransprüchen angegeben.This object has been achieved in the specified air pump by the features specified in the characterizing part of patent claim 1. Advantageous further developments are specified in the subclaims.

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 specified in the following description of an embodiment of the invention, which is shown in the drawing.

Diese zeigt:

  • Fig. 1
    eine Luftpumpe
  • Fig. 2
    eine Einzelheit aus Fig. 1 in einer alternativen Ausbildung.
This shows:
  • Fig. 1
    an air pump
  • Fig. 2
    a detail of Fig. 1 in an alternative embodiment.

Fig. 1 zeigt die erfindungsgemäße Luftpumpe, bestehend aus einem in Kunststoff gefertigten Gehäuse 1, das einerseits ein Pumpenwerk 2 aufnimmt und andererseits in einer Elektromotorkammer 3 einen Elektromotor 4. Das Gehäuse 1 ist auf der Pumpenseite von einem Deckel 5 verschlossen, der einen Ansaugstutzen 6 aufweist.1 shows the air pump according to the invention, consisting of a housing 1 made of plastic, which on the one hand accommodates a pump unit 2 and on the other hand an electric motor 4 in an electric motor chamber 3. The housing 1 is closed on the pump side by a cover 5 which has an intake port 6 having.

Erfindungsgemäß ist nun vorgesehen, daß das Pumpenwerk 2 ein oder mehrere aus Kunststoff gespritzte Pumpenlaufräder 7, 8 aufweist, wodurch eine strömungsgünstige Formgebung und ein gegenüber Metallausführung leichteres Gericht erreichbar sind. Die Pumpenlaufräder 7, 8 sind mit Laufradnaben 9, 10 auf eine Elektromotorwelle 11 aufgepreßt, wobei die Laufradnaben 9, 10 in Aufpreßrichtung gegen einen Wellenbund 12 anlegen und durch einen auf die Welle 11 gepreßten, aus Metall bestehenden Abschlußring 13 gesichert sind. Damit der relativ glatte Kunststoff auf der Welle 11 nicht gleitet, ist vorgesehen, daß einander berührende Axialflächen 14, 15 und 16 der Laufräder 7, 8 und des Abschlußringes 13 eine ineinandergreifende Verzahnung 17 aufweisen.According to the invention, it is now provided that the pump unit 2 has one or more pump impellers 7, 8 molded from plastic, as a result of which a streamlined shape and a lighter dish than metal can be achieved. The pump impellers 7, 8 are pressed with impeller hubs 9, 10 onto an electric motor shaft 11, the impeller hubs 9, 10 bearing against a shaft collar 12 in the pressing-on direction and secured by an end ring 13 made of metal and pressed onto the shaft 11. So that the relatively smooth plastic does not slide on the shaft 11, it is provided that contacting axial surfaces 14, 15 and 16 of the impellers 7, 8 and the end ring 13 have interlocking teeth 17.

Vorteilhafterweise ist vorgesehen, daß der Wellenbund 12 durch einen auf die Welle 11 gepreßten, aus Metall bestehenden Anschlagring 18 gebildet ist. Auch hier kann die Maßnahme getroffen werden, daß die einander berührenden Axialfächen 15, 19 des Laufrades 8 und des Anschlagringes 18 eine ineinandergreifende Verzahnung 20 aufweisen, wie in Fig. 2 dargestellt ist, wodurch die Laufräder 7, 8 einheitlich ausgeführt werden können. Die in der Zeichnung dargestellte Verzahnung17 erfolgt durch jeweils einen Nabenansatz 21, unterbrochen durch eine Nabenbohrung 22 und eine Nabennut 23, d. h. die eine Stirnwand 15 der Pumpenlaufradnabe 9 weist dann den Nabenansatz 21 und die andere Stirnwand 16 die Nabenut 23 auf.It is advantageously provided that the shaft collar 12 is formed by a metal stop ring 18 pressed onto the shaft 11. Here too, the measure can be taken that the contacting axial surfaces 15, 19 of the Impeller 8 and the stop ring 18 have an interlocking toothing 20, as shown in Fig. 2, whereby the impellers 7, 8 can be made uniform. The teeth 17 shown in the drawing are each provided by a hub extension 21, interrupted by a hub bore 22 and a hub groove 23, ie one end wall 15 of the pump impeller hub 9 then has the hub extension 21 and the other end wall 16 has the hub groove 23.

Entsprechend dieser Ausführung weist dann der Anschlagring 18 eine Nut 24 und der Abschlußring einen Ansatz 25 auf, die entsprechend der Nabennut 23 und des Nabenansatzes 21 ausgeführt sind.
Nach der Montage oder Teilmontage der Luftpumpe kann der Abschlußring 13 durch Laserstrahlverschweißung mit der Welle 11 verbunden und damit gegen Verdrehen gesichert sein.According to this embodiment, the stop ring 18 then has a groove 24 and the end ring has a shoulder 25 which are designed in accordance with the hub groove 23 and the hub shoulder 21.
After assembly or partial assembly of the air pump, the end ring 13 can be connected to the shaft 11 by laser beam welding and can thus be secured against rotation.

Mit der erfindungsgemäßen Luftpumpe ist ein geräuscharmer Betrieb möglich geworden, da nun leichtere Pumpenlaufräder verwendet werden können. Darüber hinaus liegt mit der Erfindung eine sehr einfach aufgebaute Luftpumpe vor, die kostengünstig herstellbar ist und eine lange Lebensdauer haben wird.With the air pump according to the invention, low-noise operation has become possible since lighter pump impellers can now be used. In addition, the invention provides a very simple air pump that is inexpensive to manufacture and will have a long service life.

Claims (5)

Elektrisch angetriebene Luftpumpe, bestehend aus einem Gehäuse mit auf einer Seite angeordnetem Pumpenwerk und auf der anderen Seite angeordnetem Elektromotor, wobei Pumpen- und Motorseite des Gehäuses durch Deckel verschlossen sind, dadurch gekennzeichnet, daß das Pumpenwerk (2) ein oder mehrere aus Kunststoff gespritzte Pumpenlaufräder (7, 8) aufweist, daß die Pumpenlaufräder (7, 8) mit Laufradnaben (9, 10) auf eine Elektromotorwelle (11) aufgepreßt sind und daß die Laufradnaben (9, 10) in Aufpreßrichtung gegen einen Wellenbund (12) anlegen und durch einen auf die Welle (11) gepreßten, aus Metall bestehenden Abschlußring (13) gesichert sind und daß einander berührende Axialflächen (14, 15 und 16) der Laufräder (7, 8) und des Abschlußringes (13) eine ineinandergreifende Verzahnung (17) aufweisen.Electrically driven air pump, consisting of a housing with a pump unit arranged on one side and an electric motor arranged on the other side, the pump and motor side of the housing being closed by a cover, characterized in that the pump unit (2) has one or more pump impellers injection molded from plastic (7, 8), that the pump impellers (7, 8) with impeller hubs (9, 10) are pressed onto an electric motor shaft (11) and that the impeller hubs (9, 10) press against a shaft collar (12) and through an on the shaft (11) pressed, made of metal end ring (13) are secured and that contacting axial surfaces (14, 15 and 16) of the impellers (7, 8) and the end ring (13) have an interlocking toothing (17) . Luftpumpe nach Anspruch 1, dadurch gekennzeichnet, daß der Wellenbund (12) durch einen auf die Welle (11) gepreßten, aus Metall bestehenden Anschlagring (18) gebildet ist.Air pump according to claim 1, characterized in that the shaft collar (12) is formed by a metal stop ring (18) pressed onto the shaft (11). Luftpumpe nach Anspruch 1, dadurch gekennzeichnet, daß die einander berührenden Axialfächen (15 und 19) des Laufrades (8) und des Anschlagringes (18) eine ineinandergreifende Verzahnung (20) aufweist.Air pump according to claim 1, characterized in that the contacting axial surfaces (15 and 19) of the impeller (8) and the stop ring (18) have interlocking teeth (20). Luftpumpe nach einem der Ansprüche 2 oder 3, dadurch gekennzeichnet, daß die Verzahnung (17, 20) durch Nabenansatz (21, 25) und Nabenut (23, 24) erfolgt.Air pump according to one of claims 2 or 3, characterized in that the toothing (17, 20) is carried out by hub attachment (21, 25) and hub groove (23, 24). Luftpumpe nach einem der vorstehenden Ansprüche , dadurch gekennzeichnet, daß der Abschlußring (13) nach der Montage der Laufräder (7, 8) durch Laserstrahlverschweißung gesichert ist.Air pump according to one of the preceding claims, characterized in that the end ring (13) is secured by laser beam welding after the impellers (7, 8) have been installed.
EP96118675A 1996-03-23 1996-11-21 Electric motor driven air pump Expired - Lifetime EP0797004B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19611512 1996-03-23
DE19611512A DE19611512A1 (en) 1996-03-23 1996-03-23 Electrically powered air pump

Publications (2)

Publication Number Publication Date
EP0797004A1 true EP0797004A1 (en) 1997-09-24
EP0797004B1 EP0797004B1 (en) 2002-08-28

Family

ID=7789192

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96118675A Expired - Lifetime EP0797004B1 (en) 1996-03-23 1996-11-21 Electric motor driven air pump

Country Status (4)

Country Link
US (1) US5797727A (en)
EP (1) EP0797004B1 (en)
DE (2) DE19611512A1 (en)
ES (1) ES2177709T3 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107002698A (en) * 2014-09-24 2017-08-01 施乐百欧洲公司 Blast fan

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DE19743069A1 (en) * 1997-09-30 1999-04-01 Pierburg Ag Electrically powered air pump
JPH11303961A (en) * 1998-04-17 1999-11-02 Nippon Seiko Kk Toroidal-type continuously variable transmission
DE19943816A1 (en) 1999-09-14 2001-03-15 Pierburg Ag Electrically powered air pump
US6296459B1 (en) * 2000-02-15 2001-10-02 Intex Recreation Corp. Electric air pump having multiple impellers and method
DE20016769U1 (en) * 2000-09-28 2000-12-14 Papst Motoren Gmbh & Co Kg Radial blowers, especially for ventilators
US6890159B2 (en) * 2002-03-19 2005-05-10 Denso Corporation Air blower with fan unable to contact motor housing
US6663343B1 (en) 2002-06-27 2003-12-16 Sea Solar Power Inc Impeller mounting system and method
US8025346B2 (en) 2006-12-15 2011-09-27 Caterpillar Inc. Machine component configuration for enhanced press fit and press fit coupling method
EP2273123B9 (en) 2009-07-08 2018-03-21 Pierburg Pump Technology GmbH Axial bearing for a pump wheel
CA3035508A1 (en) * 2011-07-13 2013-01-17 Fisher & Paykel Healthcare Limited Impeller and motor assembly
US10137264B2 (en) 2011-07-13 2018-11-27 Fisher & Paykel Healthcare Limited Respiratory assistance apparatus
WO2014097030A1 (en) 2012-12-18 2014-06-26 Fisher & Paykel Healthcare Limited Impeller and motor assembly
US11401974B2 (en) 2017-04-23 2022-08-02 Fisher & Paykel Healthcare Limited Breathing assistance apparatus

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GB190928866A (en) * 1909-12-10 1910-11-03 Edmund Allday Improvements in Multiple Centrifugal Fans.
US2857849A (en) 1953-11-13 1958-10-28 Joseph R Smylie Motor driven pumping units
US3084852A (en) * 1961-03-29 1963-04-09 Gen Electric Fan blade hub connector
EP0385298A2 (en) 1989-03-01 1990-09-05 Hitachi, Ltd. Electric blower having improved return passage for discharged air flow
DE4107149A1 (en) 1990-03-09 1991-09-12 Gold Star Electronics Blocking process in implantation of energetic ions - uses locos nitride film and improves efficiency of implantation
DE4107049A1 (en) * 1991-03-06 1992-09-10 Pierburg Gmbh Electric air pump for motor vehicles - has electric motor supported via two elastomeric rings
EP0603665A1 (en) * 1992-12-22 1994-06-29 Siemens Aktiengesellschaft Blower unit comprising a motor and a blower
DE4409629A1 (en) * 1993-03-25 1994-09-29 Ozen Sa Pump rotor and method for manufacturing it

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Publication number Priority date Publication date Assignee Title
GB190928866A (en) * 1909-12-10 1910-11-03 Edmund Allday Improvements in Multiple Centrifugal Fans.
US2857849A (en) 1953-11-13 1958-10-28 Joseph R Smylie Motor driven pumping units
US3084852A (en) * 1961-03-29 1963-04-09 Gen Electric Fan blade hub connector
EP0385298A2 (en) 1989-03-01 1990-09-05 Hitachi, Ltd. Electric blower having improved return passage for discharged air flow
DE4107149A1 (en) 1990-03-09 1991-09-12 Gold Star Electronics Blocking process in implantation of energetic ions - uses locos nitride film and improves efficiency of implantation
DE4107049A1 (en) * 1991-03-06 1992-09-10 Pierburg Gmbh Electric air pump for motor vehicles - has electric motor supported via two elastomeric rings
EP0603665A1 (en) * 1992-12-22 1994-06-29 Siemens Aktiengesellschaft Blower unit comprising a motor and a blower
DE4409629A1 (en) * 1993-03-25 1994-09-29 Ozen Sa Pump rotor and method for manufacturing it

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107002698A (en) * 2014-09-24 2017-08-01 施乐百欧洲公司 Blast fan

Also Published As

Publication number Publication date
EP0797004B1 (en) 2002-08-28
DE59609589D1 (en) 2002-10-02
US5797727A (en) 1998-08-25
ES2177709T3 (en) 2002-12-16
DE19611512A1 (en) 1997-09-25

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