EP0133845B1 - Rotor for centrifugal compressors and fans - Google Patents

Rotor for centrifugal compressors and fans Download PDF

Info

Publication number
EP0133845B1
EP0133845B1 EP84830232A EP84830232A EP0133845B1 EP 0133845 B1 EP0133845 B1 EP 0133845B1 EP 84830232 A EP84830232 A EP 84830232A EP 84830232 A EP84830232 A EP 84830232A EP 0133845 B1 EP0133845 B1 EP 0133845B1
Authority
EP
European Patent Office
Prior art keywords
appendage
blade
rotor
hub
flange
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.)
Expired
Application number
EP84830232A
Other languages
German (de)
French (fr)
Other versions
EP0133845A3 (en
EP0133845A2 (en
Inventor
Erminio Coral
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.)
Coral SpA
Original Assignee
Coral 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 Coral SpA filed Critical Coral SpA
Priority to AT84830232T priority Critical patent/ATE36588T1/en
Publication of EP0133845A2 publication Critical patent/EP0133845A2/en
Publication of EP0133845A3 publication Critical patent/EP0133845A3/en
Application granted granted Critical
Publication of EP0133845B1 publication Critical patent/EP0133845B1/en
Expired 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
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
    • 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
    • F05D2230/00—Manufacture
    • F05D2230/50—Building or constructing in particular ways
    • F05D2230/54—Building or constructing in particular ways by sheet metal manufacturing

Definitions

  • This invention relates to rotors for centrifugal compressors and fans comprising a central hub having an annular flange, a backing disc made of sheet metal and having a central bore for receiving said hub, said backing disc being connected to said annular flange of the hub, and a circular row of spaced blades, each blade being made of sheet metal and the edge facing the backing disc, of each blade, being connected to said backing disc.
  • a rotor of the above mentioned type is known from DE-C 968 553, which describes a closed rotor for centrifugal fans in which a flat rim connected to the other edges of the blades is formed by bending the free end of each blade and connecting said bent extension to the next blade.
  • the inner edge of each blade is provided with a securing flange, bent at right angle to the surface of the blade and connected to a backing disc, made of sheet metal, the central portion of which is connected to the rotor hub.
  • the manufacture of said rotor would require, besides the stamping of the blades and the shearing of the backing disc, a further operation for straightening out the sheared disc, which has to be made by skilled labour.
  • US-A-1 437 610 discloses a rotor for centrifugal compressors and fans in which each blade is made of sheet metal and is provided with a securing flange for connection to a circular web formed by machining in one piece with the hub. Said rotor is much heavier and expensive to produce than a rotor having a backing disc made of sheet metal and interposed between the blades and a flange of the hub.
  • the object of the invention is to provide a light rotor of the type specified above, which requires a smaller number of parts for its manufacture than is required for the manufacture of the rotor according to DE-C-968 583, so as to render it simpler and cheaper to manufacture.
  • each blade is provided with an integral appendage extending at right angle from said edge to the next blade and having two side edges with a circular profile concentric with the axis of rotation of the rotor, an end edge and a stepped portion close to the respective blade, the end portion of the appendage of each blade is located beneath the stepped portion of the appendage of an adjacent blade, whereby the assemblage of appendages constitute said centrally bored backing disc, and th- stepped portion of each appendage is connected to the underlying end portion of the appendage of the adjacent blade and to the flange of the hub.
  • the rotor blades are cylindrical with generatrices parallel to the axis of rotation.
  • each of the blades 1 has an integral appendage 2 lying in a plane perpendicular to the axis of rotation.
  • the appendage 2 is conveniently formed in one piece with the respective blade 1 by pressing from sheet metal.
  • the appendage 2 has two side edges 2a, 2b with circular profiles concentric with the axis of rotation, and an end edge 2c having a concave profile with a curvature equal to that of the blades 1.
  • the appendage 2 has a raised part 3 close to the root of the respective blade 1.
  • the appendage 2 also has a series of holes 4 close to the end edge 2c and a series of holes 5 in correspondence with its raised part 3.
  • each appendage 2 adjacent the end edge 2c is located beneath the raised part 3 of the appendage of the blade adjacent thereto.
  • the rotor hub, indicated 6, is provided with a flange 7 having a ring of holes 8.
  • the appendages of two adjacent blades are connected together by rivets 9 which pass through the holes 4 and 5, and by longer rivets 10 which pass through the radially innermost holes 4 and 5 and through the holes 8 in the flange 7 of the hub 6, thus connecting the blades to the hub without the need for intermediate elements.
  • the appendages 2 integral with the blades 1 in the rotor according to the present invention also fulfil the function of a disc for partly closing the rotor.
  • a rotor of the closed type could be formed by providing each blade with an integral appendage located at the opposite end to the root and lying in a plane perpendicular to the axis of rotation, for connecting together the appendages of adjacent blades in order to fulfil the function of the apertured disc indicated 11 in Figure 2.
  • connection between the appendages 2 of the blades 1 and the flange 7 of the hub 6 could be achieved by bolts or other connecting means which allow easy replacement of the blades in the event of breakage thereof during operation of the rotor, instead of by rivets.
  • connection could be achieved by welding.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Wind Motors (AREA)

Abstract

A rotor for centrifugal compressors and fans, of the type comprising a ring of blades (1) connected to a central hub (6) with an annular flange (7), is formed simply and economically by providing the root of each blade (1) with an integral appendage (2) which lies in a plane perpendicular to the axis of rotation and fixing the appendage (2) of each blade (1) to both the appendage of one of the blades adjacent thereto and to the flange (7) of the hub (6). Each blade (1) and its appendage (2) are conveniently made by pressing from sheet metal and the form of the appendages (2) is such that together they constitute a disc for a rotor of the semi-closed type or one of the discs for a rotor of the closed type.

Description

  • This invention relates to rotors for centrifugal compressors and fans comprising a central hub having an annular flange, a backing disc made of sheet metal and having a central bore for receiving said hub, said backing disc being connected to said annular flange of the hub, and a circular row of spaced blades, each blade being made of sheet metal and the edge facing the backing disc, of each blade, being connected to said backing disc.
  • A rotor of the above mentioned type is known from DE-C 968 553, which describes a closed rotor for centrifugal fans in which a flat rim connected to the other edges of the blades is formed by bending the free end of each blade and connecting said bent extension to the next blade. The inner edge of each blade is provided with a securing flange, bent at right angle to the surface of the blade and connected to a backing disc, made of sheet metal, the central portion of which is connected to the rotor hub. The manufacture of said rotor would require, besides the stamping of the blades and the shearing of the backing disc, a further operation for straightening out the sheared disc, which has to be made by skilled labour.
  • US-A-1 437 610 discloses a rotor for centrifugal compressors and fans in which each blade is made of sheet metal and is provided with a securing flange for connection to a circular web formed by machining in one piece with the hub. Said rotor is much heavier and expensive to produce than a rotor having a backing disc made of sheet metal and interposed between the blades and a flange of the hub.
  • The object of the invention is to provide a light rotor of the type specified above, which requires a smaller number of parts for its manufacture than is required for the manufacture of the rotor according to DE-C-968 583, so as to render it simpler and cheaper to manufacture.
  • In order to achieve this object, the rotor accord- - ing to the present invention is characterised in that each blade is provided with an integral appendage extending at right angle from said edge to the next blade and having two side edges with a circular profile concentric with the axis of rotation of the rotor, an end edge and a stepped portion close to the respective blade, the end portion of the appendage of each blade is located beneath the stepped portion of the appendage of an adjacent blade, whereby the assemblage of appendages constitute said centrally bored backing disc, and th- stepped portion of each appendage is connected to the underlying end portion of the appendage of the adjacent blade and to the flange of the hub.
  • The advantages of the rotor according to the present invention with respect to the rotor according to DE-C-968 553 reside in that a smaller number of parts is required for its manufacture and in that the manufacture of the rotor requires less skilled labour and is therefore cheaper.
  • Further characteristics and advantages of the present invention will become apparent from the detailed description which follows with reference to the appended drawings, provided purely by way of non-limiting example, in which:
    • Figure 1 is a plan view of a rotor for centrifugal compressors or fans,
    • Figure 2 is a section taken on the line II-II of Figure 1,
    • Figure 3 is a section taken on the line III-III of Figure 1,
    • Figure 4 is a perspective view of a blade of the rotor, and
    • Figure 5 is a perspective view of the rotor - illustrated in Figures 1 to 4.
  • In the example illustrated the rotor blades, indicated 1, are cylindrical with generatrices parallel to the axis of rotation.
  • As its root, each of the blades 1 has an integral appendage 2 lying in a plane perpendicular to the axis of rotation.
  • The appendage 2 is conveniently formed in one piece with the respective blade 1 by pressing from sheet metal.
  • The appendage 2 has two side edges 2a, 2b with circular profiles concentric with the axis of rotation, and an end edge 2c having a concave profile with a curvature equal to that of the blades 1.
  • The appendage 2 has a raised part 3 close to the root of the respective blade 1.
  • The appendage 2 also has a series of holes 4 close to the end edge 2c and a series of holes 5 in correspondence with its raised part 3.
  • During assembly of the rotor, that part of each appendage 2 adjacent the end edge 2c is located beneath the raised part 3 of the appendage of the blade adjacent thereto.
  • The rotor hub, indicated 6, is provided with a flange 7 having a ring of holes 8. The appendages of two adjacent blades are connected together by rivets 9 which pass through the holes 4 and 5, and by longer rivets 10 which pass through the radially innermost holes 4 and 5 and through the holes 8 in the flange 7 of the hub 6, thus connecting the blades to the hub without the need for intermediate elements.
  • More particularly, in the case of rotors of the semi-closed type illustrated in the drawings, there is no need to use a disc to which, in the prior art, the blades are fixed and which is fixed in its turn to the flange of the hub.
  • The appendages 2 integral with the blades 1 in the rotor according to the present invention also fulfil the function of a disc for partly closing the rotor.
  • In the case of rotors of the closed type, it is possible to fix, for example by welding, a disc 11 with a centrally-flared aperture, such as that illustrated in Figure 2, to the edges 2d of the blades 1 opposite the roots.
  • According to a variant not illustrated, a rotor of the closed type could be formed by providing each blade with an integral appendage located at the opposite end to the root and lying in a plane perpendicular to the axis of rotation, for connecting together the appendages of adjacent blades in order to fulfil the function of the apertured disc indicated 11 in Figure 2.
  • The connection between the appendages 2 of the blades 1 and the flange 7 of the hub 6 could be achieved by bolts or other connecting means which allow easy replacement of the blades in the event of breakage thereof during operation of the rotor, instead of by rivets.
  • Alternatively, the said connection could be achieved by welding.

Claims (4)

1. Rotor for centrifugal compressors and fans comprising:
- a central hub having an annular flange,
- a backing disc made of sheet metal and having a central bore for receiving said hub, said backing disc being connected to said annular flange of the hub, and
- a circular row of spaced blades, each blade being made of sheet metal and the edge facing the backing disc, of each blade, being connected to said backing disc, characterized in that
- each blade (1) is provided with an integral appendage (2) extending at right angle from said edge to the next blade and having two side edges (2a, 2b) with a circular profile concentric with the axis of rotation of the rotor, an end edge (2c) and a stepped portion (3) close to the respective blade,
- the end portion of the appendage (2) of each blade (1) is located beneath the stepped portion (3) of the appendage (2) of an adjacent blade, whereby the assemblage of appendages (2) constitute said centraiiy bored backing disc, and
- the stepped portion (3) of each appendage (2) is connected to the underlying end portion of the appendage (2) of the adjacent blade (1) and to the flange (7) of the hub (6).
2. Rotor according to claim 1, characterized in that the stepped portion (3) of each appendage (2) is riveted to the underlying and portion of the appendage (2) of the adjacent blade (1) and to the flange (7) of the hub (6).
3. Rotor according to claim 1, characterized in that the stepped portion (2) of each appendage (2) is bolted to the underlying end portion of the appendage (2) of the adjacent blade (1) and to the flange (7) of the hub (6).
4. Rotor according to claim 1, characterized in that the stepped portion (3) of each appendage is welded to the underlying end portion of the appendage (2) of the adjacent blade (1) and to the flange (7) of the hub (6).
EP84830232A 1983-08-01 1984-07-31 Rotor for centrifugal compressors and fans Expired EP0133845B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84830232T ATE36588T1 (en) 1983-08-01 1984-07-31 IMPELLER FOR CENTRIFUGAL COMPRESSOR AND BLOWER.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT6783383 1983-08-01
IT67833/83A IT1159048B (en) 1983-08-01 1983-08-01 IMPELLER FOR CENTRIFUGAL FANS AND COMPRESSORS

Publications (3)

Publication Number Publication Date
EP0133845A2 EP0133845A2 (en) 1985-03-06
EP0133845A3 EP0133845A3 (en) 1985-07-10
EP0133845B1 true EP0133845B1 (en) 1988-08-17

Family

ID=11305639

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84830232A Expired EP0133845B1 (en) 1983-08-01 1984-07-31 Rotor for centrifugal compressors and fans

Country Status (4)

Country Link
EP (1) EP0133845B1 (en)
AT (1) ATE36588T1 (en)
DE (1) DE3473494D1 (en)
IT (1) IT1159048B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0226690D0 (en) * 2002-11-15 2002-12-24 Rolls Royce Plc Vane with modified base
KR101645178B1 (en) 2013-05-10 2016-08-03 엘지전자 주식회사 Centrifugal fan and manufacturing method thereof
EP2829733B1 (en) 2013-05-10 2021-01-27 Lg Electronics Inc. Centrifugal fan
CN103307025A (en) * 2013-06-28 2013-09-18 开平市永强风机制造有限公司 Impeller of air blower
US10563665B2 (en) * 2017-01-30 2020-02-18 Rolls-Royce North American Technologies, Inc. Turbomachine stage and method of making same

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1437610A (en) * 1922-12-05 Melach j
DE370845C (en) * 1920-12-24 1923-03-08 Siemens Schuckertwerke G M B H Fan, especially for electrical machines
US1953064A (en) * 1931-12-19 1934-04-03 Parsons C A & Co Ltd Centrifugal apparatus such as fans, impellers, and the like
DE968553C (en) * 1943-10-10 1958-03-06 Siemens Ag Fans, especially for electrical machines
US3305166A (en) * 1965-02-18 1967-02-21 Gen Motors Corp Centrifugal compressor
DE2520416C3 (en) * 1975-05-07 1980-02-21 Bosch-Siemens Hausgeraete Gmbh, 7000 Stuttgart Fan wheel for high temperature operation

Also Published As

Publication number Publication date
ATE36588T1 (en) 1988-09-15
IT1159048B (en) 1987-02-25
EP0133845A3 (en) 1985-07-10
EP0133845A2 (en) 1985-03-06
IT8367833A0 (en) 1983-08-01
DE3473494D1 (en) 1988-09-22

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