EP2536956A2 - Centrifugal electric pump for suction of aeriform fluids with silencing device - Google Patents

Centrifugal electric pump for suction of aeriform fluids with silencing device

Info

Publication number
EP2536956A2
EP2536956A2 EP11713350A EP11713350A EP2536956A2 EP 2536956 A2 EP2536956 A2 EP 2536956A2 EP 11713350 A EP11713350 A EP 11713350A EP 11713350 A EP11713350 A EP 11713350A EP 2536956 A2 EP2536956 A2 EP 2536956A2
Authority
EP
European Patent Office
Prior art keywords
suction
outlet openings
suction box
electric pump
flow
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
EP11713350A
Other languages
German (de)
French (fr)
Other versions
EP2536956B1 (en
Inventor
Alfonso Bergamaschini
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.)
EMB Srl
Original Assignee
E M B DI BERGAMASCHINI ALFONSO
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 E M B DI BERGAMASCHINI ALFONSO filed Critical E M B DI BERGAMASCHINI ALFONSO
Publication of EP2536956A2 publication Critical patent/EP2536956A2/en
Application granted granted Critical
Publication of EP2536956B1 publication Critical patent/EP2536956B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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:
  • a cylindrical suction box provided with an inlet for the aeriform fluid positioned centrally with respect to a bottom of said box, with one or more outlet openings arranged on the lateral wall thereof and with a closing cover, also arranged for acting as base for said motor;
  • silencing device arranged inside said suction box, wherein said silencing device comprises an annular deflector placed in front of said outlet openings, so as to interrupt the direct path of the flow of centrifuged air between said at least one fan and said outlet openings, and arranged for creating a shaped annular damping chamber for the flow of centrifuged air, open towards said suction inlet.
  • said annular deflector forms an acute angle a with said lateral surface of said suction box, so that said shaped annular damping chamber has a triangular or trapezoidal cross section.
  • 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.
  • Figs. 1 and 3 show a cross view and an axonometric cross sectional view, respectively, of a centrifugal pump for the suction of aeriform fluids with a silencing device according to the invention
  • Fig. 2 shows a cross sectional view of a detail of the suction box without the impellers, wherein the silencing device is made transparent.
  • 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
  • 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 a 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 a 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)

Abstract

A centrifugal electric pump (1 ) for suction of aeriform fluids comprising an electric motor (2) equipped with a shaft (3); a cylindrical suction box (4) provided with an inlet (5) for the aeriform fluid, one or more outlet openings (6) arranged on the lateral wall (4") thereof and with a closing cover (7); at least one fan (8) driven in movement by said motor (2), arranged for sucking a flow of air (F) from said inlet (5), centrifuge it and discharge it outside said suction box (4) through said one or more outlet openings (6), characterized in that it comprises a silencing device arranged inside said suction box (4), wherein said silencing device comprises an annular deflector (9), placed in front of said outlet openings (6), so as to interrupt the direct path of the flow of centrifuged air (F) between said at least one fan (8) and said outlet openings (6), and arranged for creating a shaped annular damping chamber (10) for the flow of centrifuged air (F), open towards said suction inlet (5).

Description

CENTRIFUGAL ELECTRIC PUMP FOR SUCTION OF AERIFORM
FLUIDS WITH SILENCING DEVICE
* * * * *
The present invention relates to the sector of machine tools for handling aeriform fluids.
In particular, 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.
Such 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.
Said noise unfortunately persists all the time the appliance is in use, disturbing the user, polluting the working environment and affecting any other people in the vicinity.
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.
These objects are achieved with a centrifugal electric pump for suction of aeriform fluids comprising:
- an electric motor equipped with a shaft;
- a cylindrical suction box provided with an inlet for the aeriform fluid positioned centrally with respect to a bottom of said box, with one or more outlet openings arranged on the lateral wall thereof and with a closing cover, also arranged for acting as base for said motor;
- at least one fan, splined onto said shaft and driven in movement by said motor, arranged for sucking a flow of air from said inlet, centrifuge it and discharge it outside said suction box through said one or more outlet openings,
characterized in that it comprises a silencing device arranged inside said suction box, wherein said silencing device comprises an annular deflector placed in front of said outlet openings, so as to interrupt the direct path of the flow of centrifuged air between said at least one fan and said outlet openings, and arranged for creating a shaped annular damping chamber for the flow of centrifuged air, open towards said suction inlet.
According to one aspect of the invention, said annular deflector forms an acute angle a with said lateral surface of said suction box, so that said shaped annular damping chamber has a triangular or trapezoidal cross section.
According to a preferred aspect of the invention, 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.
According to another preferred aspect of the invention, 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:
- preparing a bottom for a cylindrical suction box for a centrifugal pump;
- widening the central hole serving as a suction inlet;
- using a press to deform said bottom in order to make it suitably conical, obtaining an annular deflector in the shape of a truncated cone with a shaped wing bent parallel to said closing cover;
- positioning said deflector on the base of a motor of a centrifugal pump for the suction of aeriform fluids, and fixing it in place by interference against the cylindrical lateral wall of the suction box. 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.
These and other advantages will become more apparent below, in the description of a preferred embodiment of the invention, given here as a non-limiting example with reference to the figures, wherein:
Figs. 1 and 3 show a cross view and an axonometric cross sectional view, respectively, of a centrifugal pump for the suction of aeriform fluids with a silencing device according to the invention;
Fig. 2 shows a cross sectional view of a detail of the suction box without the impellers, wherein the silencing device is made transparent.
With reference to Figs. 1-3, the figures 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.
Between them, 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 a 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.
In particular, 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:
- providing a bottom 4' of a cylindrical suction box 4 for a centrifugal pump 1 ;
- widening the central hole serving as a suction inlet 5;
- using a press to deform said bottom 4' so as to create a suitable acute angle a of conicity, obtaining an annular deflector 9 with a shaped wing 12 bent parallel to said closing cover 7;
- positioning said deflector 9 on the base of a motor 2 serving a centrifugal electric pump 1 for the suction of aeriform fluids and fixing it by interference between one of its edges 11 and the cylindrical lateral wall 4" of the suction box 4.
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 a 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.
The invention as described and illustrated enables the previously stated aims and objects to be achieved.
In practice, all the manufacturing details may naturally be replaced by other, technically equivalent solutions, and the materials, shapes and sizes may vary as necessary, without departing from the patent-protected scope of the invention as explained in the claims.

Claims

1 ) A centrifugal electric pump (1 ) for suction of aeriform fluids comprising:
- an electric motor (2) equipped with a shaft (3);
- a cylindrical suction box (4) provided with an inlet (5) for the aeriform fluid positioned centrally with respect to a bottom (4') of said box, with one or more outlet openings (6) arranged on the lateral wall (4") thereof and with a closing cover (7) also arranged for acting as base for said motor (2);
- at least one fan (8), splined onto said shaft (3) and driven in movement by said motor (2), arranged for sucking a flow of air (F) from said inlet (5), centrifuge it and discharge it outside said suction box (4) through said one or more outlet openings (6),
characterized in that it comprises a silencing device arranged inside said suction box (4), wherein said silencing device comprises an annular deflector (9), placed in front of said outlet openings (6), so as to interrupt the direct path of the flow of centrifuged air (F) between said at least one fan (8) and said outlet openings (6), and arranged for creating a shaped annular damping chamber (10) for the flow of centrifuged air (F), open towards said suction inlet (5).
2) A centrifugal electric pump (1 ) according to claim 1 , characterized in that said annular deflector (9) forms an acute angle (a) with said lateral wall (4") of said suction box (4), so that said shaped annular damping chamber (10) has a triangular or trapezoidal cross section. 3) A centrifugal electric pump (1 ) according to claim 1 , characterized in that the edge (11 ) of said annular deflector (9) with larger circumference cooperates with the lateral wall (4") of the suction box (4) to produce a joint with interference fit. A centrifugal electric pump (1 ) according to claim 1 , characterized in that said annular deflector (9) comprises a shaped wing (12) bent parallel to said closing cover (7).
EP11713350.4A 2010-02-15 2011-02-09 Centrifugal electric pump for suction of aeriform fluids with silencing device Active EP2536956B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITCR2010A000006A IT1398030B1 (en) 2010-02-15 2010-02-15 CENTRIFUGAL ELECTRIC PUMP FOR ASPIRATION OF FLUIDS AERIFORMS WITH SILENCER DEVICE.
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 true EP2536956A2 (en) 2012-12-26
EP2536956B1 EP2536956B1 (en) 2019-05-08

Family

ID=42751869

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11713350.4A Active EP2536956B1 (en) 2010-02-15 2011-02-09 Centrifugal electric pump for suction of aeriform fluids with silencing device

Country Status (4)

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

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101498016B1 (en) * 2013-09-12 2015-03-09 임경상 Apparatus for suction of centrifugation type

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 (en) * 1989-03-01 1995-07-19 株式会社日立製作所 Electric blower
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
AU5457199A (en) * 1999-08-11 2001-03-05 Turk Elektrik Endustrisi A.S. 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 (en) * 2002-11-19 2004-01-15 Seleon Gmbh Fan units for a ventilator

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2011098898A2 *

Also Published As

Publication number Publication date
ITCR20100006A1 (en) 2011-08-16
EP2536956B1 (en) 2019-05-08
IT1398030B1 (en) 2013-02-07
US20120308361A1 (en) 2012-12-06
WO2011098898A3 (en) 2011-12-01
WO2011098898A2 (en) 2011-08-18

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