EP1517044A1 - A volute casing for fans for use in fan convectors - Google Patents

A volute casing for fans for use in fan convectors Download PDF

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Publication number
EP1517044A1
EP1517044A1 EP03425614A EP03425614A EP1517044A1 EP 1517044 A1 EP1517044 A1 EP 1517044A1 EP 03425614 A EP03425614 A EP 03425614A EP 03425614 A EP03425614 A EP 03425614A EP 1517044 A1 EP1517044 A1 EP 1517044A1
Authority
EP
European Patent Office
Prior art keywords
casing
fan
frame
intended
mechanical stiffness
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Withdrawn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
EP03425614A
Other languages
German (de)
French (fr)
Inventor
Valerio Giordano Riello
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.)
Aermec SpA
Original Assignee
Aermec SpA
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 Aermec SpA filed Critical Aermec SpA
Priority to EP03425614A priority Critical patent/EP1517044A1/en
Priority to IT001784A priority patent/ITMI20041784A1/en
Publication of EP1517044A1 publication Critical patent/EP1517044A1/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Withdrawn legal-status Critical Current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
    • F04D29/4206—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
    • F04D29/02—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
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
    • F04D29/624—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/626—Mounting or removal of fans
    • 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
    • F05D2300/50—Intrinsic material properties or characteristics
    • F05D2300/501—Elasticity

Definitions

  • the present invention relates to a casing and, in particular, to a volute casing which is intended to constitute the housing of the rotor of a fan particularly for fan convectors and comprises a first portion and a second portion that are connected to one another in a coupling plane by releasable connection means.
  • volute casings in two separate portions is commonly used in the specific field of the manufacture of fan units for fan convectors since, amongst other things, it permits easy mounting of the rotor and quick connection to the frame of the fan convector.
  • volute casing is fixed to the frame of the fan convector or to a part thereof, the rotor is positioned inside the portion with the shaft supported by respective bearings and, finally, the volute casing is closed by positioning the second portion on the first, to which it is fixed by connection means which can be released to permit any subsequent dismantling.
  • the portion of the casing that is intended to be fixed to the frame of the fan convector also performs the function of a mechanical support for the entire volute casing and is therefore secured firmly to the frame with little chance of vibrating, clearly, in the event of loosening of the connection means, the other portion which is intended mainly to perform the function simply of a closure cover, can easily vibrate and knock against the first portion, generating annoying noises.
  • both of the portions of which the volute casings are composed are made of metallic material so that mutual knocks and bangs are naturally very noisy.
  • the object of the present invention is therefore to provide a volute casing for housing the rotors of fan units of fan convectors of the type indicated in the introduction, with characteristics such as to prevent the production of annoying noises in operation.
  • this object is achieved by means of a volute casing according to Claim 1.
  • the present invention enables the quietest possible fan convector to be produced.
  • volute casing is constituted by a first portion 2 and by a second portion 3 which are connected to one another in a coupling plane 4 by connection means constituted by pairs of slots 5 formed in the portion 2 and by pairs of teeth 6 formed in the portion 3.
  • the rotor which has blades 8 and is shown schematically in Figure 1, is housed inside the volute casing 1 in conventional manner.
  • the axis of rotation of the rotor is indicated 9.
  • the portion 2 of the casing is intended to be connected, by means of its flattened region 10, to the frame of the fan convector, not shown, or to a part thereof such as, for example, the condensation collecting tray, which is also not shown but is conventional.
  • the portion 2 is thus intended also to perform a structural support function and the material of which it is made must therefore have sufficient mechanical stiffness.
  • this portion 2 is made of bent sheet metal or pressed aluminium or even, preferably, of a rigid plastics material the mechanical stiffness value of which is at most equal to, but no greater than, that of the material of the frame or part thereof to which the portion 2 is connected.
  • the portion 3 which is to be connected to the portion 2 in the plane 4 performs mainly the function of a closure cover of the casing 1 and can therefore be made entirely of a material having low mechanical stiffness such as, for example, an elastomeric plastics material, or natural or synthetic rubber.
  • it is made of a plastics material having a mechanical stiffness value no greater than that of the material of which the first portion 2 is made.
  • the second portion 3 is preferably also made of the same material.
  • any vibrations that may arise between the two portions 2 and 3 of the casing 1 in the coupling plane 4 do not generate annoying noises such as those which might result if both portions 2 and 3 were made of metallic material.
  • the portion 3 which has the function of a cover may be made of the above-mentioned material having low mechanical stiffness purely on the periphery 11 which is intended to come into contact with the portion 2 of the casing in the coupling plane 4.

Abstract

A casing, in particular, a volute casing (1) which is intended to constitute the housing of the rotor (7) of a fan particularly for fan convectors, comprises a first portion (2) and a second portion (3) that are connected to one another in a coupling plane (4) by releasable connection means (5, 6); the first portion (2) is intended to be connected to the frame of the fan convector or to a part thereof and the second portion (3) is the portion which acts as a closure cover of the casing (1). The first portion (2) is made of a first material having a mechanical stiffness value no greater than that of the material of the frame or part thereof to which the portion is connected and the second portion (3) is made of a second material having a mechanical stiffness value no greater than that of the said first material.

Description

  • The present invention relates to a casing and, in particular, to a volute casing which is intended to constitute the housing of the rotor of a fan particularly for fan convectors and comprises a first portion and a second portion that are connected to one another in a coupling plane by releasable connection means.
  • The construction of volute casings in two separate portions is commonly used in the specific field of the manufacture of fan units for fan convectors since, amongst other things, it permits easy mounting of the rotor and quick connection to the frame of the fan convector.
  • In fact, a portion of the volute casing is fixed to the frame of the fan convector or to a part thereof, the rotor is positioned inside the portion with the shaft supported by respective bearings and, finally, the volute casing is closed by positioning the second portion on the first, to which it is fixed by connection means which can be released to permit any subsequent dismantling.
  • It is known that one of the main problems which affect fan convectors is the generation of noise which is produced by fan units and in particular by the vibrations which arise between the two portions which make up the volute casings in which the rotors are housed because of possible loosening of the connection means which may occur with the passage of time.
  • Whereas the portion of the casing that is intended to be fixed to the frame of the fan convector also performs the function of a mechanical support for the entire volute casing and is therefore secured firmly to the frame with little chance of vibrating, clearly, in the event of loosening of the connection means, the other portion which is intended mainly to perform the function simply of a closure cover, can easily vibrate and knock against the first portion, generating annoying noises.
  • This is aggravated by the fact that, according to the prior art, both of the portions of which the volute casings are composed are made of metallic material so that mutual knocks and bangs are naturally very noisy.
  • The object of the present invention is therefore to provide a volute casing for housing the rotors of fan units of fan convectors of the type indicated in the introduction, with characteristics such as to prevent the production of annoying noises in operation.
  • According to the present invention, this object is achieved by means of a volute casing according to Claim 1.
  • The present invention, enables the quietest possible fan convector to be produced.
  • The characteristics and the advantages of the present invention will become clear from the following detailed description of an embodiment which is illustrated by way of non-limiting example in the appended drawings, in which:
  • Figure 1 shows the volute casing according to the present invention in a section transverse the axis of rotation of the rotor,
  • Figure 2 shows the first portion of the casing of Figure 2 in cross-section,
  • Figure 3 shows the second portion of the casing of Figure 2 in section,
  • Figure 4 is a view of the first portion of the casing of Figure 2 taken from the side having the respective connection means, and
  • Figure 5 is a view of the second portion of the casing of Figure 3 taken from the side having the respective connection means.
  • With reference to the above-mentioned drawings, the volute casing, generally indicated 1, is constituted by a first portion 2 and by a second portion 3 which are connected to one another in a coupling plane 4 by connection means constituted by pairs of slots 5 formed in the portion 2 and by pairs of teeth 6 formed in the portion 3.
  • The rotor, indicated 7, which has blades 8 and is shown schematically in Figure 1, is housed inside the volute casing 1 in conventional manner. The axis of rotation of the rotor is indicated 9.
  • The portion 2 of the casing is intended to be connected, by means of its flattened region 10, to the frame of the fan convector, not shown, or to a part thereof such as, for example, the condensation collecting tray, which is also not shown but is conventional.
  • The portion 2 is thus intended also to perform a structural support function and the material of which it is made must therefore have sufficient mechanical stiffness. Normally, this portion 2 is made of bent sheet metal or pressed aluminium or even, preferably, of a rigid plastics material the mechanical stiffness value of which is at most equal to, but no greater than, that of the material of the frame or part thereof to which the portion 2 is connected.
  • The portion 3 which is to be connected to the portion 2 in the plane 4 performs mainly the function of a closure cover of the casing 1 and can therefore be made entirely of a material having low mechanical stiffness such as, for example, an elastomeric plastics material, or natural or synthetic rubber.
  • Preferably, it is made of a plastics material having a mechanical stiffness value no greater than that of the material of which the first portion 2 is made.
  • If the first portion 2 is made of a plastics material having a stiffness value less than that of the material of the frame or part thereof to which the portion 2 is connected, the second portion 3 is preferably also made of the same material.
  • As a result, in the event of loosening of the connection means 5 and 6, any vibrations that may arise between the two portions 2 and 3 of the casing 1 in the coupling plane 4 do not generate annoying noises such as those which might result if both portions 2 and 3 were made of metallic material.
  • Alternatively, the portion 3 which has the function of a cover may be made of the above-mentioned material having low mechanical stiffness purely on the periphery 11 which is intended to come into contact with the portion 2 of the casing in the coupling plane 4.

Claims (5)

  1. A casing, in particular, a volute casing (1) which is intended to constitute the housing of the rotor (7) of a fan particularly for fan convectors, comprising a first portion (2) and a second portion (3) that are connected to one another in a coupling plane (4) by releasable connection means (5, 6), and in which the first portion (2) is intended to be connected to the frame of the fan convector or to a part thereof and the second portion (3) is the portion which acts as a closure cover of the casing (1), characterized in that the first portion (2) is made of a first material having a mechanical stiffness value no greater than that of the material of the frame or part thereof to which the portion is connected and the second portion (3) is made of a second material having a mechanical stiffness value no greater than that of the said first material.
  2. A casing according to Claim 1, characterized in that the first material is a metallic material.
  3. A casing according to Claim 1, characterized in that the first material is a plastics material.
  4. A casing according to Claims 1 and 3, characterized in that the second material is a plastics material having a mechanical stiffness value equal to that of the first material.
  5. A casing according to Claims 1 to 4, characterized in that the second casing portion (3) is made of the said second material at least on the periphery (11) which is in contact with the first portion (2) in the coupling plane (4).
EP03425614A 2003-09-22 2003-09-22 A volute casing for fans for use in fan convectors Withdrawn EP1517044A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP03425614A EP1517044A1 (en) 2003-09-22 2003-09-22 A volute casing for fans for use in fan convectors
IT001784A ITMI20041784A1 (en) 2003-09-22 2004-09-17 SPIRAL COLLECTOR FOR FANS TO BE ENGAGED IN FAN COIL UNITS.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP03425614A EP1517044A1 (en) 2003-09-22 2003-09-22 A volute casing for fans for use in fan convectors

Publications (1)

Publication Number Publication Date
EP1517044A1 true EP1517044A1 (en) 2005-03-23

Family

ID=34178701

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03425614A Withdrawn EP1517044A1 (en) 2003-09-22 2003-09-22 A volute casing for fans for use in fan convectors

Country Status (2)

Country Link
EP (1) EP1517044A1 (en)
IT (1) ITMI20041784A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2017077595A1 (en) * 2015-11-04 2018-02-22 三菱電機株式会社 Fan casing

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4321924C1 (en) * 1993-07-01 1994-06-23 Siegenia Frank Kg Radial-flow fan production method
US5639228A (en) * 1994-10-29 1997-06-17 Pierburg Gmbh Electrically driven air pump having friction-fit, air-tight seal joints
DE19721367A1 (en) * 1996-05-24 1997-12-04 Fime Fab It Motor Elett Fan or impeller volute in pair of half shells for suction fan of sealed boiler combustion chamber
DE19906537A1 (en) * 1999-02-17 2000-08-31 Behr Gmbh & Co Housing for radial fan for motor vehicle heating or air conditioning system has helical dividing line between housing with axial component and pitch that is constant in axial direction
US20020178980A1 (en) * 2000-08-30 2002-12-05 Gatley William Stuart Blower housing with maximized interior spacing
US20030159803A1 (en) * 2000-07-07 2003-08-28 Ole Hansen Ventilating device and a building comprising such a ventilating device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4321924C1 (en) * 1993-07-01 1994-06-23 Siegenia Frank Kg Radial-flow fan production method
US5639228A (en) * 1994-10-29 1997-06-17 Pierburg Gmbh Electrically driven air pump having friction-fit, air-tight seal joints
DE19721367A1 (en) * 1996-05-24 1997-12-04 Fime Fab It Motor Elett Fan or impeller volute in pair of half shells for suction fan of sealed boiler combustion chamber
DE19906537A1 (en) * 1999-02-17 2000-08-31 Behr Gmbh & Co Housing for radial fan for motor vehicle heating or air conditioning system has helical dividing line between housing with axial component and pitch that is constant in axial direction
US20030159803A1 (en) * 2000-07-07 2003-08-28 Ole Hansen Ventilating device and a building comprising such a ventilating device
US20020178980A1 (en) * 2000-08-30 2002-12-05 Gatley William Stuart Blower housing with maximized interior spacing

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2017077595A1 (en) * 2015-11-04 2018-02-22 三菱電機株式会社 Fan casing
CN108350905A (en) * 2015-11-04 2018-07-31 三菱电机株式会社 Blower-casting
CN108350905B (en) * 2015-11-04 2019-11-22 三菱电机株式会社 Blower-casting

Also Published As

Publication number Publication date
ITMI20041784A1 (en) 2004-12-17

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