EP2536956B1 - Elektrische zentrifugalpumpe zur ansaugung von gasförmigen flüssigkeiten mit einer dämpfervorrichtung - Google Patents

Elektrische zentrifugalpumpe zur ansaugung von gasförmigen flüssigkeiten mit einer dämpfervorrichtung Download PDF

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Publication number
EP2536956B1
EP2536956B1 EP11713350.4A EP11713350A EP2536956B1 EP 2536956 B1 EP2536956 B1 EP 2536956B1 EP 11713350 A EP11713350 A EP 11713350A EP 2536956 B1 EP2536956 B1 EP 2536956B1
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EP
European Patent Office
Prior art keywords
suction
outlet openings
suction box
electric pump
silencing device
Prior art date
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Application number
EP11713350.4A
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English (en)
French (fr)
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EP2536956A2 (de
Inventor
Alfonso Bergamaschini
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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
    • F04D29/66—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
    • F04D29/663—Sound attenuation
    • 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
    • F04D29/667—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence

Definitions

  • the present invention relates to the sector of machine tools for handling aeriform fluids.
  • the present invention relates to single- and multistage centrifugal pumps and suction devices driven by an electric motor, particularly suitable for use as vacuum pumps in vacuum cleaners and floor washers, used to clean surfaces by sucking up air containing dust or liquids, in domestic as well as in industrial and professional appliances.
  • Conventional centrifugal electric pumps for the suction of aeriform fluids essentially comprise a high-RPM electric motor and a cylindrical suction box with an inlet through which the fluid is sucked, and at least one outlet opening for discharging said fluid.
  • the movement of the fluid through the chamber inside said box is induced by at least one impeller, or fan, contained therein.
  • Said fan is arranged for sucking a flow of air through the suction inlet, located centrally in relation to a bottom of said box, centrifuge it and return it to the environment through a plurality of outlet openings arranged on the lateral surface of said suction box or, alternatively, in a tangential version of the pump, through a single outlet opening connected to a tangential outlet pipe.
  • Such a pump is normally used in vacuum cleaners or floor washers to create a negative pressure inside a tank for collecting dust or liquid contained in the flow of air sucked into the device.
  • centrifugal electric pumps for aeriform fluids have a major drawback: when in use, because of the high turning speed of the motor, the air is sucked into and subsequently discharged from the appliance at high speeds. The impact of the air against the outlet openings and the turbulence induced inside the suction chamber by the rotation of the fan give rise to high noise levels.
  • the object of the present invention is to overcome said drawback by means of a centrifugal electric pump for the suction of aeriform fluids with a silencing device that reduces the noise it generates when in use.
  • Another object of the present invention is to produce a silencing device that is easy to install in any type of suction box for said pumps, avoiding or reducing the need for additional fixing means and containing the manufacturing costs.
  • centrifugal electric pump for suction of aeriform fluids comprising:
  • the edge of said annular deflector with larger circumference cooperates with the lateral wall of the suction box to produce a joint with interference fit.
  • said annular deflector comprises a shaped wing bent parallel to said closing cover.
  • a preferred method for obtaining and installing the silencing device in the cylindrical suction box of a centrifugal pump for the suction of aeriform fluids comprises the following stages:
  • the invention offers the following advantages.
  • the main advantage lies in a considerable reduction in the amount of noise usually generated inside the suction box of said centrifugal electric pump for the suction of aeriform fluids.
  • the annular deflector arranged and shaped so that the outlet opening(s) come to be downstream from the flow of air sucked into the appliance, shields said outlet openings, preventing the flow of air from being discharged directly, and orthogonally as is normally the case, at maximum speed.
  • the shaped annular damping chamber delimited laterally by said annular deflector and open on the side facing said suction inlet, also only allows the flow of air to reach the outlet openings from below, further damping its speed and the turbulence created by the fan inside said suction box.
  • Another advantage lies in the simplicity with which said annular deflector cooperates with the lateral wall of the suction box to achieve a joint with an interference fit, possibly even without any need for additional fixing means, thereby containing the manufacturing costs and assembly times.
  • the method for manufacturing the silencing device is also highly advantageous, involving the reuse, after simple processing steps, of the same closing cover for the suction boxes of known types of centrifugal pumps used for the suction of aeriform fluids, readily available without having to manufacture any additional components.
  • FIG. 1-3 show a centrifugal electric pump 1 for the suction of aeriform fluids with a silencing device according to a preferred embodiment of the present invention.
  • Said electric pump 1 essentially comprises an electric motor 2 with a drive shaft 3, a suction box 4, and fans 8 arranged for moving a flow of air F.
  • Said suction box 4 has a cylindrical shape and comprises a circular bottom 4' with a suction inlet 5 located at its centre, and a lateral surface with a plurality of outlet openings 6.
  • the bottom 4' and the lateral wall 4" of the box 4 are made of a single, suitably shaped and perforated sheet of metal.
  • Said box 4 is closed at the top by a cover 7 arranged for serving as a base for said motor 2 as well.
  • Said fans 8 are splined onto said drive shaft 3 and driven by said motor 2.
  • the silencing device comprises an annular deflector 9, arranged inside said suction box 4 in front of said outlet openings 6.
  • said annular deflector 9 and the lateral wall 4" of said suction box 4 laterally delimit a shaped annular damping chamber 10 for the flow F of centrifuged air, wherein said chamber 10 opens towards said suction inlet 5.
  • the annular deflector forms an acute angle ⁇ with said lateral wall 4" of said suction box 4, so that said shaped annular damping chamber has a triangular or trapezoidal cross section.
  • the edge 11 of said annular deflector 9 with the wider circumference cooperates with the lateral wall of the suction box to achieve a joint with an interference fit.
  • said annular deflector 9 comprises a shaped wing 12 bent parallel to said closing cover 7.
  • a preferred method for obtaining and installing the silencing device in the cylindrical suction box 4 of a centrifugal electric pump 1 for the suction of aeriform fluids comprises the following stages:
  • the operation of the silencing device is as follows.
  • the flow of air F is drawn through the suction inlet 5, centrifuged by the fans 8 located inside the suction box 4 and sent towards the outlet openings 6.
  • the annular deflector 9 deviates the flow of air F, intercepting its direct discharge perpendicular to the outlet openings 6. Said flow of air F is carried under the chamber 10 laterally delimited by the annular deflector 9 forming an acute angle ⁇ with the cylindrical wall 4" of the suction box 4, and it is obliged to reach the outlet openings 6 by travelling through the annular chamber 10 with a sloping wall and consequently with a gradually narrowing cross section.
  • the table below compares the noise levels recorded on two centrifugal pumps for the suction of aeriform fluids, connected to a vacuum measuring device with a calibrated fluid inlet of selectively variable dimensions, wherein one of said pumps is provided with a silencing device according to the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • External Artificial Organs (AREA)
  • Degasification And Air Bubble Elimination (AREA)

Claims (3)

  1. Eine Elektrokreiselpumpe (1) zur Ansaugung von gasartigen Flüssigkeiten, umfassend:
    - einen Elektromotor (2), ausgestattet mit einer Welle (3);
    - einen zylinderförmigen Saugkasten (4), versehen mit einem Eingang (5) für die gasartige Flüssigkeit, zentral gelegen in Bezug auf den Boden (4') des besagten Kastens, mit einer oder mehreren Ausgangsöffnungen (6), angeordnet auf dessen Seitenwand (4") und mit einem Verschlussdeckel (7), ebenfalls angeordnet, um als Basis für besagten Motor (2) zu wirken;
    - mindestens einen Ventilator (8), der auf besagter Welle (3) eingekeilt ist und von besagtem Motor (2) angetrieben wird, angeordnet, um einen Luftstrom (F) durch besagten Eingang (5) anzusaugen, ihn zu zentrifugieren und ihn außerhalb des besagten Saugkastens (4) durch besagte eine oder mehrere Ausgangsöffnungen (6) auszustoßen;
    - eine Schalldämpfungsvorrichtung, innerhalb des besagten Saugkastens (4) angeordnet, wobei besagte Schalldämpfungsvorrichtung einen ringförmigen Deflektor (9) umfasst, der vor besagten Ausgangsöffnungen (6) platziert ist, sodass er den direkten Weg des zentrifugierten Luftstroms (F) zwischen dem besagten mindestens einen Ventilator (8) und den besagten Ausgangsöffnungen (6) unterbricht und angeordnet, um eine ringförmige Dämpfungskammer (10) für den zentrifugierten Luftstrom (F) zu schaffen, offen gegenüber dem besagten Saugeingang (5), wobei besagte ringförmige Dämpfungskammer (10) eine Schrägwand besitzt, gekennzeichnet dadurch, dass besagte ringförmige Dämpfungskammer (10) einen Querschnitt aufweist, der sich allmählich zu den Ausgangsöffnungen (6) hin verengt, und dadurch, dass besagter ringförmiger Deflektor (9) einen spitzen Winkel (α) mit besagter Schrägwand (4") des besagten Saugkastens (4) bildet, so dass besagte ringförmige Dämpfungskammer (10) einen dreieckigen oder trapezförmigen Querschnitt hat.
  2. Eine Elektrokreiselpumpe (1) gemäß Anspruch 1, gekennzeichnet dadurch, dass der Rand (11) des besagten ringförmigen Deflektors (9) mit breiterem Umfang mit der Schrägwand (4") des Saugkastens (4) zusammenarbeitet, um eine Verbindung mit Festsitz zu bilden.
  3. Eine Elektrokreiselpumpe (1) gemäß Anspruch 1, gekennzeichnet dadurch, dass besagter ringförmiger Deflektor (9) einen geformten Trakt (12) umfasst, der zu besagtem Verschlussdeckel (7) parallel gebogen ist.
EP11713350.4A 2010-02-15 2011-02-09 Elektrische zentrifugalpumpe zur ansaugung von gasförmigen flüssigkeiten mit einer dämpfervorrichtung Active EP2536956B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITCR2010A000006A IT1398030B1 (it) 2010-02-15 2010-02-15 Elettropompa centrifuga per aspirazione di fluidi aeriformi con dispositivo silenziatore.
PCT/IB2011/000244 WO2011098898A2 (en) 2010-02-15 2011-02-09 Centrifugal electric pump for suction of aeriform fluids with silencing device

Publications (2)

Publication Number Publication Date
EP2536956A2 EP2536956A2 (de) 2012-12-26
EP2536956B1 true EP2536956B1 (de) 2019-05-08

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Application Number Title Priority Date Filing Date
EP11713350.4A Active EP2536956B1 (de) 2010-02-15 2011-02-09 Elektrische zentrifugalpumpe zur ansaugung von gasförmigen flüssigkeiten mit einer dämpfervorrichtung

Country Status (4)

Country Link
US (1) US20120308361A1 (de)
EP (1) EP2536956B1 (de)
IT (1) IT1398030B1 (de)
WO (1) WO2011098898A2 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101498016B1 (ko) * 2013-09-12 2015-03-09 임경상 원심분리식 흡입장치

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2888192A (en) * 1956-12-27 1959-05-26 American Machine & Metals Vacuum cleaner motor-fan unit
GB1420278A (en) * 1972-08-18 1976-01-07 Gen Signal Corp Motor fan device for vacuum cleaners
US4669952A (en) * 1985-05-17 1987-06-02 Ametek, Inc. Quiet by-pass vacuum motor
JPH0765597B2 (ja) * 1989-03-01 1995-07-19 株式会社日立製作所 電動送風機
US5156535A (en) * 1990-10-31 1992-10-20 Itt Corporation High speed whirlpool pump
US6166462A (en) * 1998-05-04 2000-12-26 Ametek, Inc. Bypass motor/fan assembly having separate working air passages
WO2001011206A2 (en) * 1999-08-11 2001-02-15 Türk Elektrik Endüstrisi A.Ş. Perforated acoustic silencer for electrical motors
US6439843B1 (en) * 2000-11-16 2002-08-27 Ametek, Inc. Motor/fan assembly having a radial diffuser bypass
DE10253937B3 (de) * 2002-11-19 2004-01-15 Seleon Gmbh Lüftereinheiten für ein Beatmungsgerät

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP2536956A2 (de) 2012-12-26
IT1398030B1 (it) 2013-02-07
ITCR20100006A1 (it) 2011-08-16
WO2011098898A2 (en) 2011-08-18
WO2011098898A3 (en) 2011-12-01
US20120308361A1 (en) 2012-12-06

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