EP0924436A2 - Fan casing - Google Patents

Fan casing Download PDF

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Publication number
EP0924436A2
EP0924436A2 EP98830730A EP98830730A EP0924436A2 EP 0924436 A2 EP0924436 A2 EP 0924436A2 EP 98830730 A EP98830730 A EP 98830730A EP 98830730 A EP98830730 A EP 98830730A EP 0924436 A2 EP0924436 A2 EP 0924436A2
Authority
EP
European Patent Office
Prior art keywords
semi
die
motor
fan
rotor assembly
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
EP98830730A
Other languages
German (de)
French (fr)
Other versions
EP0924436A3 (en
EP0924436B1 (en
Inventor
Lino Natalini
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.)
LN 2 S.R.L.
LN DI NATALINI LINO & C. S.P.A.
Original Assignee
Ln Di Natalini Lino & C - Srl
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 Ln Di Natalini Lino & C - Srl filed Critical Ln Di Natalini Lino & C - Srl
Publication of EP0924436A2 publication Critical patent/EP0924436A2/en
Publication of EP0924436A3 publication Critical patent/EP0924436A3/en
Application granted granted Critical
Publication of EP0924436B1 publication Critical patent/EP0924436B1/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
    • 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
    • F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
    • F04D29/701—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps
    • F04D29/703—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps specially for fans, e.g. fan guards

Definitions

  • This patent application refers to a fan for installation in gas boilers with proof combustion, which is provided with a die-cast aluminum casing including a bracket for the support and centering of the motor-rotor assembly.
  • the combustion chamber of the "proof combustion” boilers is hermetically sealed and works in light depression thanks to the suction action of a fan, used to suck in the fumes of the combustion chamber and push them along the flue from which the said fumes are expelled into the air.
  • the fan comprises a centrifuge rotor with cylindrical cage configuration housed inside a spiral composed of two semi-shells that is rigidly fixed to the boiler frame.
  • the motor-rotor assembly is supported on the outside of the back wall of the spiral with the interposition of some anti-vibration rubber collars, used to prevent the assembly vibrations from being integrally transmitted to the spiral and from the spiral to the boiler casing, thus generating annoying noises.
  • bracket used as an additional support for the motor-rotor assembly onto the external side of the back wall of the spiral.
  • the bracket supports the whole weight of the motor-rotor assembly during the operation of the fan that is fixed to the boiler casing with the driving shaft in perfectly horizontal position.
  • the bracket Since the orientation of the fan on the boiler casing is known in advance, the bracket is located in such a position that, once the fan is installed, the bracket is located on the projection of the barycenter of the motor-rotor assembly, in order to represent a perfectly centered point of support with respect to the barycenter of the motor-rotor assembly above it.
  • the assembling and fixing of the bracket to the fan casing is usually carried out manually. Even if this operation is carried out by specialized workers, it is not possible to guarantee with utmost certainty that all the brackets are positioned exactly in the same position on the fan casing.
  • the purpose of the present invention is to find a solution to guarantee with utmost accuracy and reliability the perfect position of the bracket outside the spiral of the fans that are normally used in proof combustion boilers.
  • the fan according to this invention features an ordinary centrifuge rotor with cylindrical cage configuration - not shown in the enclosed drawings since it is of known structure and does not have anything to do with the present invention - housed inside a spiral composed of two semi-shells (1 and 2).
  • the bottom wall (1a) of the first semi-shell (1) features a small central hole (1b) for the shaft of the electrical motor (M) that operates the above mentioned rotor, which is screwed onto the external side of the bottom wall (1a) provided with an annular series of drilled indentations (1c) used to fix the support U bolt (C) of the motor-rotor assembly with the interposition of anti-vibration rubber collars (G).
  • the bottom wall (2a) of the second semi-shell (2) features a wide circular window (2b) that represents the suction opening of the fan.
  • the fan casing is obtained by matching the two semi-shells (1 and 2) to obtain a spiral ending with a nozzle of circular delivery (4) obtained half with the semi-shell (1) and half with the semi-shell (2).
  • each semi-shell (1 and 2) is obtained from one die-cast aluminum piece.
  • the external wall of the semi-shell (1) features a bracket (5) obtained from one die-cast piece together with the semi-shell, composed of a small shelf (5a) that projects perpendicularly from the said wall and is tangent to the circumference on which the above mentioned annular series of drilled indentations is distributed.
  • the shelf (5a) is hardened by a lateral pair of triangular pieces and features a central hole (5c) on which the anti-shock rubber (G) is located to support the weight of the motor-rotor assembly, once the fan is installed inside the boiler.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Centrifugal Separators (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Gas Burners (AREA)

Abstract

This invention relates to a fan for gas boilers with proof combustion, comprising a centrifuge rotor housed inside a spiral made up of two die-cast aluminum semi-shells, of which one is externally provided with a bracket for the support and centering of the motor-rotor assembly made from one die cast piece together with its semi-shell.

Description

  • This patent application refers to a fan for installation in gas boilers with proof combustion, which is provided with a die-cast aluminum casing including a bracket for the support and centering of the motor-rotor assembly.
  • As it is known, the combustion chamber of the "proof combustion" boilers is hermetically sealed and works in light depression thanks to the suction action of a fan, used to suck in the fumes of the combustion chamber and push them along the flue from which the said fumes are expelled into the air.
  • The fan comprises a centrifuge rotor with cylindrical cage configuration housed inside a spiral composed of two semi-shells that is rigidly fixed to the boiler frame. The motor-rotor assembly is supported on the outside of the back wall of the spiral with the interposition of some anti-vibration rubber collars, used to prevent the assembly vibrations from being integrally transmitted to the spiral and from the spiral to the boiler casing, thus generating annoying noises.
  • It is a common practice today to screw a bracket used as an additional support for the motor-rotor assembly onto the external side of the back wall of the spiral. The bracket supports the whole weight of the motor-rotor assembly during the operation of the fan that is fixed to the boiler casing with the driving shaft in perfectly horizontal position.
  • Since the orientation of the fan on the boiler casing is known in advance, the bracket is located in such a position that, once the fan is installed, the bracket is located on the projection of the barycenter of the motor-rotor assembly, in order to represent a perfectly centered point of support with respect to the barycenter of the motor-rotor assembly above it.
  • The assembling and fixing of the bracket to the fan casing is usually carried out manually. Even if this operation is carried out by specialized workers, it is not possible to guarantee with utmost certainty that all the brackets are positioned exactly in the same position on the fan casing.
  • Even a small inaccuracy in the bracket position may prejudice the perfect centering of the motor-rotor assembly with respect to the casing, thus causing strong vibrations able to generate annoying noises during the operation of the fan.
  • The purpose of the present invention is to find a solution to guarantee with utmost accuracy and reliability the perfect position of the bracket outside the spiral of the fans that are normally used in proof combustion boilers.
  • This purpose is obtained with a fan with die-cast aluminum casing including the above-mentioned bracket located outside the fan spiral.
  • For clearer explication, the description of the fan model according to this invention continues with reference to the enclosed drawings, which only have an explanatory, not restrictive purpose, where:
    • Fig. 1 is a view of the first of the two semi-shells used to build the fan casing according to this invention;
    • Fig. 2 is a view of the internal side of the first of the two semi-shells as mentioned above;
    • Fig. 3 is a view of the external side of the first of the two semi-shells as mentioned above;
    • Fig. 4 is a view of the second of the two semi-shells used to build the fan casing according to this invention;
    • Fig. 5 is a view of the internal side of the second of the two semi-shells as mentioned above;
    • Fig. 6 is a view of the external side of the second of the two semi-shells as mentioned above;
    • Fig. 7 and 8 are two views with different angle of the fan provided with the motor-rotor assembly.
  • With reference to the above mentioned figures, the fan according to this invention features an ordinary centrifuge rotor with cylindrical cage configuration - not shown in the enclosed drawings since it is of known structure and does not have anything to do with the present invention - housed inside a spiral composed of two semi-shells (1 and 2).
  • The bottom wall (1a) of the first semi-shell (1) features a small central hole (1b) for the shaft of the electrical motor (M) that operates the above mentioned rotor, which is screwed onto the external side of the bottom wall (1a) provided with an annular series of drilled indentations (1c) used to fix the support U bolt (C) of the motor-rotor assembly with the interposition of anti-vibration rubber collars (G).
  • The bottom wall (2a) of the second semi-shell (2) features a wide circular window (2b) that represents the suction opening of the fan.
  • The fan casing is obtained by matching the two semi-shells (1 and 2) to obtain a spiral ending with a nozzle of circular delivery (4) obtained half with the semi-shell (1) and half with the semi-shell (2).
  • It must be noted that according to the present invention each semi-shell (1 and 2) is obtained from one die-cast aluminum piece.
  • The external wall of the semi-shell (1) features a bracket (5) obtained from one die-cast piece together with the semi-shell, composed of a small shelf (5a) that projects perpendicularly from the said wall and is tangent to the circumference on which the above mentioned annular series of drilled indentations is distributed.
  • The shelf (5a) is hardened by a lateral pair of triangular pieces and features a central hole (5c) on which the anti-shock rubber (G) is located to support the weight of the motor-rotor assembly, once the fan is installed inside the boiler.

Claims (2)

  1. Fan for gas boilers with proof combustion, provided with a die-cast aluminum casing including a bracket for the support and centering of the motor-rotor assembly, of the type comprising a centrifuge rotor housed inside a spiral made up of two symmetrically matched die-cast aluminum semi-shells (1 and 2), characterized in that the semi-shells (1 and 2) are obtained from one die-cast aluminum piece and the external wall of the semi-shell supporting the motor-rotor assembly features a bracket (5) which is obtained from one die-cast piece together with the semi-shell and composed of a small shelf (5a) that projects perpendicularly from the said wall and is tangent to the circumference on which an annular series of drilled indentations (1c) is distributed, with the indentations located on the external wall of the semi-shell to support the U bolt supporting the motor-rotor assembly.
  2. Fan according to the claim 1, characterized in that the small shelf (5a) is hardened by a lateral pair of triangular pieces (5b) and features a central hole (5c).
EP98830730A 1997-12-17 1998-12-03 Fan casing Expired - Lifetime EP0924436B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMC970027U 1997-12-17
IT1997MC000027U IT238513Y1 (en) 1997-12-17 1997-12-17 FAN FOR WATERPROOF COMBUSTION GAS BOILERS, EQUIPPED WITH A DIE-CAST ALUMINUM CASE INCORPORATING A TEAM OF

Publications (3)

Publication Number Publication Date
EP0924436A2 true EP0924436A2 (en) 1999-06-23
EP0924436A3 EP0924436A3 (en) 2000-02-23
EP0924436B1 EP0924436B1 (en) 2004-04-21

Family

ID=11357353

Family Applications (2)

Application Number Title Priority Date Filing Date
EP98830731A Withdrawn EP0924437A3 (en) 1997-12-17 1998-12-03 Fan casing with condensate collection and drainage
EP98830730A Expired - Lifetime EP0924436B1 (en) 1997-12-17 1998-12-03 Fan casing

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP98830731A Withdrawn EP0924437A3 (en) 1997-12-17 1998-12-03 Fan casing with condensate collection and drainage

Country Status (3)

Country Link
EP (2) EP0924437A3 (en)
DE (1) DE69823318T2 (en)
IT (1) IT238513Y1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001000996A1 (en) * 1999-06-30 2001-01-04 Alliedsignal Inc. Die cast compressor housing for centrifugal compressors with a true volute shape
EP1591668A1 (en) * 2004-04-30 2005-11-02 Nidec Shibaura Corporation Blower
DE10204037C5 (en) * 2002-02-01 2009-07-23 Ebm-Papst Landshut Gmbh Radial fan with electric motor
CN103807217A (en) * 2012-11-07 2014-05-21 日本电产株式会社 Centrifugal fan, housing component cast, and method of manufacturing housing component

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2584146A1 (en) * 1985-06-28 1987-01-02 Sueddeutsche Kuehler Behr Radial-flow fan frame
EP0596837A2 (en) * 1992-10-28 1994-05-11 F.I.M.E. - FABBRICA ITALIANA MOTORI ELETTRICI - S.r.l. A barycentric support for balancing the motor-rotor unit on airtight combustion chamber boilers

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3446435A1 (en) * 1984-12-20 1986-07-03 Wolfgang 6630 Saarlouis Arweiler Pipe for ventilation and aeration
US4899726A (en) * 1988-09-12 1990-02-13 Carrier Corporation Furnace inducer outlet elbow
US4892045A (en) * 1988-09-22 1990-01-09 Snyder General Corporation Condensate drain system
DE29608984U1 (en) * 1995-05-15 1996-07-04 Vaillant Joh Gmbh & Co heater
US5620302A (en) * 1995-08-31 1997-04-15 Fasco Industries, Inc. Dynamic condensate evacuator for high efficiency gas furnaces

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2584146A1 (en) * 1985-06-28 1987-01-02 Sueddeutsche Kuehler Behr Radial-flow fan frame
EP0596837A2 (en) * 1992-10-28 1994-05-11 F.I.M.E. - FABBRICA ITALIANA MOTORI ELETTRICI - S.r.l. A barycentric support for balancing the motor-rotor unit on airtight combustion chamber boilers

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001000996A1 (en) * 1999-06-30 2001-01-04 Alliedsignal Inc. Die cast compressor housing for centrifugal compressors with a true volute shape
DE10204037C5 (en) * 2002-02-01 2009-07-23 Ebm-Papst Landshut Gmbh Radial fan with electric motor
EP1591668A1 (en) * 2004-04-30 2005-11-02 Nidec Shibaura Corporation Blower
CN103807217A (en) * 2012-11-07 2014-05-21 日本电产株式会社 Centrifugal fan, housing component cast, and method of manufacturing housing component
CN103807217B (en) * 2012-11-07 2016-05-04 日本电产株式会社 The manufacture method of centrifugal fan, cabinet parts cast body and cabinet parts

Also Published As

Publication number Publication date
IT238513Y1 (en) 2000-11-13
ITMC970027U1 (en) 1999-06-17
EP0924437A3 (en) 2000-02-23
DE69823318T2 (en) 2005-05-04
EP0924436A3 (en) 2000-02-23
EP0924437A2 (en) 1999-06-23
EP0924436B1 (en) 2004-04-21
DE69823318D1 (en) 2004-05-27

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