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EP0556895A1 - Device for displacing a gaseous or liquid medium, and vacuum cleaner comprising such a device - Google Patents

Device for displacing a gaseous or liquid medium, and vacuum cleaner comprising such a device Download PDF

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Publication number
EP0556895A1
EP0556895A1 EP93200352A EP93200352A EP0556895A1 EP 0556895 A1 EP0556895 A1 EP 0556895A1 EP 93200352 A EP93200352 A EP 93200352A EP 93200352 A EP93200352 A EP 93200352A EP 0556895 A1 EP0556895 A1 EP 0556895A1
Authority
EP
European Patent Office
Prior art keywords
guide vanes
viewed
flow direction
displacing
gaseous
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.)
Withdrawn
Application number
EP93200352A
Other languages
German (de)
French (fr)
Inventor
Michiel Allan Aurelius Schallig
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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 Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Gloeilampenfabrieken NV
Publication of EP0556895A1 publication Critical patent/EP0556895A1/en
Withdrawn legal-status Critical Current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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/445—Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps
    • F04D29/448—Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps bladed diffusers
    • 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
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/441—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps
    • F04D29/444—Bladed diffusers
    • 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
    • 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
    • F05D2250/00—Geometry
    • F05D2250/50—Inlet or outlet
    • F05D2250/52—Outlet

Definitions

  • the invention relates to a device for displacing a gaseous or liquid medium, which device comprises a rotatably drivable impeller wheel and a diffusor comprising a plurality of guide vanes adjoining the impeller wheel viewed in the flow direction, of which two successive guide vanes have an overlap viewed in the flow direction, between which guide vanes diverging passages for the medium are formed.
  • a problem associated with compressors is the high noise level.
  • any obstacle in a fluctuating gas or liquid stream constitutes a source of noise.
  • the level of the noise produced upon impingement of a stream upon an obstacle is to be minimised.
  • a device for displacing a gas or a liquid such as for example a compressor
  • such an obstacle acting as a source of noise is formed by inter alia a wall of a guide vane of a diffusor.
  • each guide vane has at least one opening which, viewed in the flow direction, is situated in the first one of two successive guide vanes outside said overlap.
  • each guide vane adjoining the rotatable vanes of the compressor has an opening which, viewed in the flow direction, is situated in the first one of two successive guide vanes outside said overlap.
  • a preferred embodiment of the device is characterised in that the opening is a slit.
  • a further embodiment is characterised in that the slit extends parallel to the impeller-vane end edges facing the guide vanes. As a result of this, levelling out will take place at the location of the slit over its entire height substantially simultaneously and within a minimal time.
  • Yet another embodiment of the device in accordance with the invention is characterised in that the slits extend over the entire height of the guide vanes and are open at one end.
  • the compressor comprises a housing 1 with an inlet 2.
  • the housing accommodates a motor 3, which drives an impeller wheel 4, and a diffusor 5 having a plurality of guide vanes 6. Viewed in the flow direction A two successive guide vanes have an overlap 7 (see Fig. 2).
  • the rotation of the impeller wheel causes air to be drawn into the housing of the compressor through the inlet 2 and to be blown radially towards the diffusor 5.
  • the air stream is guided by the diverging passages 8 (see Fig. 2) and deflected via the wall 9 of the compressor housing, after which it is blown past the motor.
  • the guide vanes 6 of the diffusor have openings in the form of slits 10 extending parallel to the end edges 11 of the impeller vanes 12, which edges face the guide vanes. Near the entry side 12 of the air each guide vane 6 preferably has one slit which extends over the entire height of the guide vane and which is open at the upper end. Measurements on a compressor having a speed of 25,000 revolutions per minute have revealed that a slit width of approximately 1 mm yields a noise level reduction of approximately 10 dB(A) at twice the rate of passage of the vanes ( i.e. the product of the number of vanes and the number of revolutions) and higher harmonic frequencies. This is illustrated in Fig.
  • the device is particularly suitable for use in compressors, for example in vacuum cleaners, but also in blowers in which diffusor-like vanes are arranged downstream of the impeller wheel.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Electric Suction Cleaners (AREA)

Abstract

A device for displacing a gaseous or liquid medium comprises a rotatably drivable impeller wheel and a diffusor (5) having a plurality of guide vanes (6) adjoining the impeller wheel viewed in the flow direction (A), of which two successive guide vanes have an overlap (7) viewed in the flow direction, between which guide vanes diverging passages (8) for the medium are formed. In order to reduce the noise level each guide vane has at least one opening (10) which, viewed in the flow direction (A), is situated in the first one of two successive guide vanes outside said overlap (7). Preferably, the opening is a slit.

Description

  • The invention relates to a device for displacing a gaseous or liquid medium, which device comprises a rotatably drivable impeller wheel and a diffusor comprising a plurality of guide vanes adjoining the impeller wheel viewed in the flow direction, of which two successive guide vanes have an overlap viewed in the flow direction, between which guide vanes diverging passages for the medium are formed.
  • Such a device is known from US-A-4,679,990.
  • A problem associated with compressors is the high noise level. In fact, any obstacle in a fluctuating gas or liquid stream constitutes a source of noise. In general, the level of the noise produced upon impingement of a stream upon an obstacle is to be minimised. In a device for displacing a gas or a liquid, such as for example a compressor, such an obstacle acting as a source of noise is formed by inter alia a wall of a guide vane of a diffusor.
  • It is an object of the invention to provide a device for displacing a gaseous or liquid medium with a comparatively low noise level.
  • To this end the device in accordance with the invention is characterised in that each guide vane has at least one opening which, viewed in the flow direction, is situated in the first one of two successive guide vanes outside said overlap.
  • It is another object of the invention to provide a vacuum cleaner which has a compressor forming part of said device and whose noise level is low.
  • To this end the vacuum cleaner in accordance with the invention is characterised in that each guide vane adjoining the rotatable vanes of the compressor has an opening which, viewed in the flow direction, is situated in the first one of two successive guide vanes outside said overlap.
  • Surprisingly, it has been found that said steps lead to a considerable reduction of the noise level in a device and in a vacuum cleaner in accordance with the invention. A possible explanation could be that time-shifted pressure impulses of different magnitude are produced at opposite sides of a guide vane, and that these impulses are levelled out by the openings in the guide vanes.
  • In order to enable a pressure impulse to be levelled out effectively a preferred embodiment of the device is characterised in that the opening is a slit.
  • A further embodiment is characterised in that the slit extends parallel to the impeller-vane end edges facing the guide vanes. As a result of this, levelling out will take place at the location of the slit over its entire height substantially simultaneously and within a minimal time.
  • Yet another embodiment of the device in accordance with the invention is characterised in that the slits extend over the entire height of the guide vanes and are open at one end.
  • The invention will now be described in more detail on the basis of a vacuum-cleaner compressor shown in the drawings. In the drawings
    • Fig. 1 is a view of a compressor with the impeller wheel and the diffusor shown partly in sectional view,
    • Fig. 2 is a perspective view of the diffusor with the guide vanes, and
    • Fig. 3 shows noise amplitude versus frequency curves for guide vanes with and without slits.
  • The compressor comprises a housing 1 with an inlet 2. The housing accommodates a motor 3, which drives an impeller wheel 4, and a diffusor 5 having a plurality of guide vanes 6. Viewed in the flow direction A two successive guide vanes have an overlap 7 (see Fig. 2). In operation the rotation of the impeller wheel causes air to be drawn into the housing of the compressor through the inlet 2 and to be blown radially towards the diffusor 5. In the diffusor the air stream is guided by the diverging passages 8 (see Fig. 2) and deflected via the wall 9 of the compressor housing, after which it is blown past the motor.
  • The guide vanes 6 of the diffusor have openings in the form of slits 10 extending parallel to the end edges 11 of the impeller vanes 12, which edges face the guide vanes. Near the entry side 12 of the air each guide vane 6 preferably has one slit which extends over the entire height of the guide vane and which is open at the upper end. Measurements on a compressor having a speed of 25,000 revolutions per minute have revealed that a slit width of approximately 1 mm yields a noise level reduction of approximately 10 dB(A) at twice the rate of passage of the vanes (i.e. the product of the number of vanes and the number of revolutions) and higher harmonic frequencies. This is illustrated in Fig. 3, in which the rate of passage of the vanes {Hz} has been plotted verses the noise amplitude {dB(A)}. The curve A relates to the situation without slits in the guide vanes and the curve B to the situation with slits in the guide vanes.
  • The device is particularly suitable for use in compressors, for example in vacuum cleaners, but also in blowers in which diffusor-like vanes are arranged downstream of the impeller wheel.

Claims (5)

  1. A device for displacing a gaseous or liquid medium, which device comprises a rotatably drivable impeller wheel and a diffusor comprising a plurality of guide vanes adjoining the impeller wheel viewed in the flow direction, of which two successive guide vanes have an overlap viewed in the flow direction, between which guide vanes diverging passages for the medium are formed, characterised in that each guide vane has at least one opening which, viewed in the flow direction, is situated in the first one of two successive guide vanes outside said overlap.
  2. A device as claimed in Claim 1, characterised in that the opening is a slit.
  3. A device as claimed in Claim 2, characterised in that the slit extends parallel to the impeller-vane end edges facing the guide vanes.
  4. A device as claimed in Claim 2 or 3, characterised in that the slits extend over the entire height of the guide vanes and are open at one end.
  5. A vacuum cleaner comprising a device as claimed in any one of the preceding Claims.
EP93200352A 1992-02-17 1993-02-10 Device for displacing a gaseous or liquid medium, and vacuum cleaner comprising such a device Withdrawn EP0556895A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP92200443 1992-02-17
EP92200443 1992-02-17

Publications (1)

Publication Number Publication Date
EP0556895A1 true EP0556895A1 (en) 1993-08-25

Family

ID=8210429

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93200352A Withdrawn EP0556895A1 (en) 1992-02-17 1993-02-10 Device for displacing a gaseous or liquid medium, and vacuum cleaner comprising such a device

Country Status (2)

Country Link
EP (1) EP0556895A1 (en)
JP (1) JPH0585340U (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0622549A1 (en) * 1993-04-28 1994-11-02 Hitachi, Ltd. Centrifugal compressor and vaned diffuser
WO1997019629A1 (en) * 1995-11-24 1997-06-05 Nilfisk A/S A blower for a vacuum cleaner
KR100457551B1 (en) * 2001-12-19 2004-11-17 엘지전자 주식회사 The centrifugal blower for a cleaner
EP1538342A3 (en) * 2003-12-06 2005-07-06 Johnson Electric S.A. Blower motor
EP1618821A3 (en) * 2004-07-20 2006-06-07 LG Electronics, Inc. Centrifugal fan and vacuum cleaner having the centrifugal fan
EP1790263A3 (en) * 2005-11-28 2008-07-02 Samsung Gwangju Electronics Co., Ltd. Fan assembly for vacuum cleaner
RU2331351C2 (en) * 2006-07-25 2008-08-20 Самсунг Гуангджу Электроникс Ко., Лтд. Fan assembly for vacuum cleaner
CN103126611A (en) * 2011-11-30 2013-06-05 乐金电子(天津)电器有限公司 Vacuum cleaner fan diffuser structure capable of reducing noise
EP3312432A1 (en) * 2016-10-19 2018-04-25 IFP Energies nouvelles Diffuser for a fluid compression device, comprising at least one vane with opening
CN108158489A (en) * 2017-12-26 2018-06-15 大连民族大学 A kind of noise-decreasing device of dust catcher
CN109340187A (en) * 2018-10-08 2019-02-15 江苏美的清洁电器股份有限公司 Impeller, blower and dust catcher are determined for dust catcher
GB2578760A (en) * 2018-11-07 2020-05-27 Dyson Technology Ltd Compressor

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2399072A (en) * 1944-10-18 1946-04-23 Gen Electric Centrifugal compressor
CH317623A (en) * 1953-11-28 1956-11-30 Sulzer Ag Shoveling for hoisting machines with centrifugal force
FR2185222A5 (en) * 1972-05-19 1973-12-28 Neyrpic Creusot Loire
US3917434A (en) * 1974-10-07 1975-11-04 Gen Motors Corp Diffuser
JPS55146299A (en) * 1979-04-27 1980-11-14 Matsushita Electric Ind Co Ltd Electric blower
US4679990A (en) * 1984-12-28 1987-07-14 Matsushita Electric Industrial Co., Ltd. Electric blower
DE3835622A1 (en) * 1987-10-19 1989-05-03 Sundstrand Corp RADIAL COMPRESSORS

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2399072A (en) * 1944-10-18 1946-04-23 Gen Electric Centrifugal compressor
CH317623A (en) * 1953-11-28 1956-11-30 Sulzer Ag Shoveling for hoisting machines with centrifugal force
FR2185222A5 (en) * 1972-05-19 1973-12-28 Neyrpic Creusot Loire
US3917434A (en) * 1974-10-07 1975-11-04 Gen Motors Corp Diffuser
JPS55146299A (en) * 1979-04-27 1980-11-14 Matsushita Electric Ind Co Ltd Electric blower
US4679990A (en) * 1984-12-28 1987-07-14 Matsushita Electric Industrial Co., Ltd. Electric blower
DE3835622A1 (en) * 1987-10-19 1989-05-03 Sundstrand Corp RADIAL COMPRESSORS

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 5, no. 18 (M-53)(690) 3 February 1981 & JP-A-55 146 299 ( MATSUSHITA ) 14 November 1980 *

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0622549A1 (en) * 1993-04-28 1994-11-02 Hitachi, Ltd. Centrifugal compressor and vaned diffuser
US5516263A (en) * 1993-04-28 1996-05-14 Hitachi, Ltd. Centrifugal compressor and vaned diffuser
US5709531A (en) * 1993-04-28 1998-01-20 Hitachi, Ltd. Centrifugal compressor and vaned diffuser
WO1997019629A1 (en) * 1995-11-24 1997-06-05 Nilfisk A/S A blower for a vacuum cleaner
KR100457551B1 (en) * 2001-12-19 2004-11-17 엘지전자 주식회사 The centrifugal blower for a cleaner
EP1538342A3 (en) * 2003-12-06 2005-07-06 Johnson Electric S.A. Blower motor
US7223070B2 (en) 2003-12-06 2007-05-29 Johnson Electric S.A. Blower motor
EP1618821A3 (en) * 2004-07-20 2006-06-07 LG Electronics, Inc. Centrifugal fan and vacuum cleaner having the centrifugal fan
EP1790263A3 (en) * 2005-11-28 2008-07-02 Samsung Gwangju Electronics Co., Ltd. Fan assembly for vacuum cleaner
RU2331351C2 (en) * 2006-07-25 2008-08-20 Самсунг Гуангджу Электроникс Ко., Лтд. Fan assembly for vacuum cleaner
CN103126611A (en) * 2011-11-30 2013-06-05 乐金电子(天津)电器有限公司 Vacuum cleaner fan diffuser structure capable of reducing noise
EP3312432A1 (en) * 2016-10-19 2018-04-25 IFP Energies nouvelles Diffuser for a fluid compression device, comprising at least one vane with opening
US10995770B2 (en) 2016-10-19 2021-05-04 IFP Energies Nouvelles Diffuser for a fluid compression device, comprising at least one vane with opening
CN108158489A (en) * 2017-12-26 2018-06-15 大连民族大学 A kind of noise-decreasing device of dust catcher
CN109340187A (en) * 2018-10-08 2019-02-15 江苏美的清洁电器股份有限公司 Impeller, blower and dust catcher are determined for dust catcher
GB2578760A (en) * 2018-11-07 2020-05-27 Dyson Technology Ltd Compressor
GB2578760B (en) * 2018-11-07 2021-08-04 Dyson Technology Ltd Compressor

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Publication number Publication date
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