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WO2018181084A1 - Roue et machine rotative - Google Patents

Roue et machine rotative Download PDF

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Publication number
WO2018181084A1
WO2018181084A1 PCT/JP2018/011963 JP2018011963W WO2018181084A1 WO 2018181084 A1 WO2018181084 A1 WO 2018181084A1 JP 2018011963 W JP2018011963 W JP 2018011963W WO 2018181084 A1 WO2018181084 A1 WO 2018181084A1
Authority
WO
WIPO (PCT)
Prior art keywords
segment
impeller
disk
disk portion
axis
Prior art date
Application number
PCT/JP2018/011963
Other languages
English (en)
Japanese (ja)
Inventor
勇哉 紺野
Original Assignee
三菱重工コンプレッサ株式会社
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 三菱重工コンプレッサ株式会社 filed Critical 三菱重工コンプレッサ株式会社
Priority to US16/491,325 priority Critical patent/US20200032810A1/en
Publication of WO2018181084A1 publication Critical patent/WO2018181084A1/fr

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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
    • F04D29/284—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for compressors
    • 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
    • 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
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/266—Rotors specially for elastic fluids mounting compressor rotors on shafts
    • 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
    • F05D2230/20—Manufacture essentially without removing material
    • F05D2230/23—Manufacture essentially without removing material by permanently joining parts together
    • 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
    • F05D2300/60—Properties or characteristics given to material by treatment or manufacturing
    • F05D2300/603—Composites; e.g. fibre-reinforced

Definitions

  • the present invention relates to an impeller used for a rotating machine.
  • rotating machines such as industrial compressors, turbo refrigerators, and small gas turbines include an impeller in which a plurality of blades are attached to a disk fixed to a rotating shaft. This rotating machine gives pressure energy and velocity energy to the gas by rotating the impeller.
  • Patent Document 1 proposes making the impeller into one piece.
  • Patent Document 1 discloses an impeller that includes a disk part, a blade part, and a cover part.
  • the disk part is divided into two parts by a dividing surface perpendicular to the axis on the inner side in the radial direction of the blade part.
  • a first segment and a second member (second segment).
  • Patent document 1 proposes joining a 1st segment and a 2nd segment by a split surface. According to the proposal of patent document 1, while being able to improve the quality of a flow-path shape, it is supposed that an impeller can be easily attached or detached with respect to a rotating shaft.
  • Patent Document 1 the first segment and the second segment are joined to each other by brazing or friction stir welding (Friction Stir Welding) on the dividing surface.
  • This joining method is based on the premise that the first segment and the second segment in Patent Document 1 are made of a metal material. That is, in Patent Document 1, the choices of materials applied to the first segment and the second segment are limited.
  • an object of the present invention is to provide an impeller and a rotating machine that can expand the choice of materials applied to the first segment and the second segment.
  • the impeller of the present invention includes a disk portion fixed to a rotating shaft that rotates about an axis, a cover portion that is disposed to face the disk portion, and a plurality of blade portions that are provided between the disk portion and the cover portion, Is provided.
  • the impeller in the present invention includes a first segment composed of a first disk portion that is a portion on one side of the axis of the disk portion, a second disk portion that is a portion on the other side of the axis of the disk portion, and a cover portion. And a second segment in which the blade part is integrally formed, and a joining layer that joins the first disk part of the first segment and the second disk part of the second segment with an adhesive. .
  • the material choices for the first segment and the second segment are limited to metal materials. It spreads to fiber reinforced resin. That is, the impeller of this invention can comprise a 1st segment from a metal material or fiber reinforced resin, and can comprise a 2nd segment from a metal material or fiber reinforced resin.
  • the impeller of the present invention can be configured such that the first segment is made of a metal material and the second segment is made of a fiber reinforced resin. Moreover, the impeller of this invention can comprise both a 1st segment and a 2nd segment from fiber reinforced resin. Furthermore, the impeller of this invention can comprise both a 1st segment and a 2nd segment from a metal material.
  • the impeller of the present invention can be fixed to the rotating shaft via the first disk portion of the first segment.
  • the first segment can be fitted to the rotary shaft with a margin.
  • the first segment is made of a fiber reinforced resin, the first segment can be fitted to the rotating shaft via an adhesive.
  • the first segment and the second segment are made of a metal material
  • the present invention also provides a rotating machine including the impeller described above.
  • the first segment and the second segment are joined via the adhesive layer.
  • the material which comprises a 1st segment and a 2nd segment can be selected without being limited to a metal material, the choice of material spreads. Therefore, since the fiber reinforced resin that is lighter than, for example, a metal material can be formed in the first segment or the second segment, according to the present invention, the effect that the impeller can be reduced in weight compared to the case where the whole is made of a metal material. Bring.
  • the centrifugal compressor 100 includes a casing 102 and a rotating shaft 101 that is pivotally supported on the casing 102 via a journal bearing 103 and a thrust bearing 104.
  • the rotating shaft 101 is supported so as to be rotatable around the axis O, and a plurality of impellers 1 are attached to the rotating shaft 101 side by side in the direction of the axis O.
  • the impeller 1 compresses the gas G sucked from the suction port 3 opened on one side in the direction of the axis O while passing through the flow path 105 formed inside the impeller 1.
  • the impeller 1 is configured to discharge the compressed gas G from the discharge port 4 toward the outside in the radial direction.
  • Each impeller 1 compresses the gas G supplied from the upstream flow path 105 formed in the casing 102 into the downstream flow path 105 in a stepwise manner using centrifugal force generated by the rotation of the rotary shaft 101. Shed.
  • the casing 102 is formed with a suction port 106 for allowing the gas G to flow in from the outside on the front side (F) in the direction of the axis O of the rotary shaft 101. Further, the casing 102 is formed with a discharge port 107 for allowing the gas G to flow out to the outside on the rear side (R) in the direction of the axis O.
  • FIG. 1 shows an example in which six impellers 1 are provided in series on the rotating shaft 101, it is sufficient that at least one impeller 1 is provided on the rotating shaft 101.
  • FIG. 1 shows an example in which six impellers 1 are provided in series on the rotating shaft 101, it is sufficient that at least one impeller 1 is provided on the rotating shaft 101.
  • FIG. 1 shows an example in which six impellers 1 are provided in series on the rotating shaft 101, it is sufficient that at least one impeller 1 is provided on the rotating shaft 101.
  • a case where only one impeller 1 is provided on the rotating shaft 101 will be described as an example.
  • the impeller 1 includes a disk unit 30, a blade unit 40, and a cover unit 50.
  • the disk part 30 is attached to the rotating shaft 101 by being fitted from the outside in the radial direction.
  • the disk unit 30 includes a first disk unit 31 and a second disk unit 35 that are divided into two in the direction of the axis O by a bonding layer BL orthogonal to the axis O.
  • the first disk part 31 and the second disk part 35 are joined by a joining layer BL.
  • the first disk portion 31 has a substantially cylindrical shape with the axis O as the center.
  • the first disk portion 31 includes a grip portion A that is fitted to the rotating shaft 101 with a tightening margin on the front end portion 33 side on the front side (F) of the axis O.
  • cold fitting or shrink fitting can be applied.
  • the impeller 1 in this embodiment is fixed to the rotating shaft 101 only by the grip portion A.
  • the first disk portion 31 includes an outer peripheral surface 34 that gradually increases in diameter toward the rear side (R) of the axis O. This outer peripheral surface 34 is a concave curved surface toward the outside in a cross section including the axis O.
  • the rear end surface 32 on the rear side (R) of the axis O is bonded to the second disk portion 35 via a bonding layer BL made of an adhesive.
  • the second disk portion 35 is formed in a disk shape extending from the rear end portion 36 side opposite to the front end portion 33 side in the direction of the axis O toward the radially outer side.
  • the inner diameter side region 38 of the front end surface 37 is bonded via the rear end surface 32 bonding layer BL of the first disk portion 31.
  • the rear end face 32 and the inner diameter side region 38 of the front end face 37 constitute a bonding layer BL orthogonal to the axis O.
  • an epoxy resin adhesive, an anaerobic strong sealant or the like is applied for the bonding layer BL. If the impeller 1 is exposed to a temperature of about 200 ° C. as an example, the applied adhesive must have heat resistance at 200 ° C.
  • a plurality of blade parts 40 are arranged at predetermined intervals in the circumferential direction of the disk part 30.
  • the blade portion 40 is formed with a substantially constant plate thickness and protrudes from the front end surface 37 of the disk portion 30 toward the front side (F) in the direction of the axis O. Further, the blade portion 40 has a slightly tapered shape toward the outside in the radial direction in a side view.
  • each blade portion 40 is formed so as to go to the rear side in the rotation direction R of the impeller 1 as it goes to the outer side in the radial direction of the disk portion 30 when viewed from the direction of the axis O.
  • Each blade portion 40 is formed to be concavely curved toward the rear side in the rotational direction R when viewed from the direction of the axis O.
  • the blade portion 40 only needs to extend to the rear side in the rotational direction R toward the outer side in the radial direction.
  • the blade portion 40 may be formed linearly when viewed from the direction of the axis O.
  • the cover portion 50 is disposed to face the disk portion 30 and covers the blade portion 40 from the front end portion 33 side in the direction of the axis O.
  • the cover portion 50 has a rear end surface 52 in the direction of the axis O formed integrally with the front edge 41 of the blade portion 40.
  • the thickness dimension of the cover part 50 is formed in a plate shape in which the thickness dimension on the outer side in the radial direction is slightly thin, similarly to the thickness dimension of the disk part 30.
  • the cover part 50 has a bent part 51 bent toward the front side in the direction of the axis O at the position of the inner end 42 of the blade part 40.
  • the bonding layer BL is disposed inside the blade portion 40 in the radial direction. Further, the front end portion 33 of the first disk portion 31 is disposed so as to protrude forward (F) in the direction of the axis O from the front end edge 53 of the bent portion 51. Further, the impeller 1 has a flow path 105 through which the gas G flows by the outer peripheral surface 34 of the first disk portion 31, the front end surface 37 of the second disk portion 35, the side surface 43 of the blade portion 40, and the rear end surface 52 of the cover portion 50. Is formed.
  • the impeller 1 includes a first segment SG1 and a second segment SG2.
  • the first segment SG1 is composed of a first disk portion 31 that is a portion on one side of the axis O of the disk portion 30.
  • the second segment SG ⁇ b> 2 includes a second disk part 35, which is a part on the other side of the axis O of the disk part 30, a blade part 40, and a cover part 50.
  • the first segment SG1 is made of a metal material, for example, precipitation hardening stainless steel, while the second segment SG2 is made of fiber reinforced resin (FRP).
  • FRP fiber reinforced resin
  • carbon fiber or glass fiber is used as the reinforcing fiber.
  • CFRP Carbon Fiber Reinforced Plastics
  • CFRP Carbon Fiber Reinforced Plastics
  • the manufacturing method of the impeller 1 mentioned above is demonstrated, referring FIG.4 and FIG.5.
  • the first segment SG1 is manufactured by casting, cutting, or the like (FIG. 4A, FIG. 5 Step S101).
  • the second segment SG2 in which the second disk portion 35, the blade portion 40, and the cover portion 50 are integrated is produced (FIG. 4A, FIG. 5, step S103).
  • the second segment SG2 made of fiber reinforced resin is integrally manufactured by injection molding.
  • the first segment SG1 and the second segment SG2 are manufactured in this order, but this manufacturing order may be reversed.
  • the first segment SG1 (first disk portion 31) is fitted and fixed to the rotating shaft 101 (FIG. 4B, FIG. 5, step S105).
  • This fitting can be performed by shrink fitting.
  • the shrink fitting is performed by thermally expanding the first segment SG1 in the radial direction and then fitting the rotary shaft 101.
  • the first segment SG1 is cooled to room temperature, the first segment SG1 and the rotary shaft 101 are fitted with a margin.
  • the rear end surface 32 of the first segment SG1 (first disk portion 31) fitted to the rotary shaft 101 and the front end surface 37 (inner diameter side) of the second segment SG2 (second disk portion 35) separately manufactured.
  • the adhesive B is applied to the region 38) (FIG. 4B, FIG. 5, step S107). Note that the adhesive B may be applied to either the rear end surface 32 or the front end surface 37.
  • the second segment SG2 After applying the adhesive B to the rear end face 32 and the front end face 37, the second segment SG2 is fitted to the rotary shaft 101, and then pushed in until the rear end face 32 and the front end face 37 of the first segment SG1 abut. If the load is applied and held between the rear end face 32 and the front end face 37 until the adhesive B is cured, the joining of the first segment SG1 and the second segment SG2 is completed (FIG. 4 (c), FIG. 5 steps) S109).
  • the impeller 1 since the first segment SG1 and the second segment SG2 are joined with an adhesive, the range of selection of materials applied to the second segment SG2 is widened, and the second segment SG2 is lighter than a metal material. It can be made of any fiber reinforced resin. Therefore, since the weight of the impeller 1 can be reduced as compared with the case where the whole is made of a metal material, the highly efficient centrifugal compressor 100 can be obtained according to this embodiment.
  • the impeller 1 can be fitted to the rotary shaft 101 with a required strength simply by fitting it with a tightening margin, for example, by shrink fitting. Therefore, according to the impeller 1, since it is not necessary to provide a mechanical fitting structure such as a key and a key groove, the impeller 1 can be easily manufactured.
  • the bonding layer BL made of the adhesive of the first segment SG1 and the second segment SG2 may be maintained by bonding the rear end face 32 and the front end face 37 coated with the adhesive in the atmosphere. Therefore, according to the first embodiment, the joining operation is easier than using a heat treatment furnace whose temperature is controlled in a vacuum like brazing.
  • the impeller 1 can be manufactured in a short time.
  • the impeller 1 since bonding with an adhesive can be performed at room temperature without heating, the impeller 1 is not deformed by the application of heat. Therefore, according to the present embodiment, it is possible to obtain the impeller 1 with high shape and dimensional accuracy. In addition, since the bonding with the adhesive can be performed in the atmosphere, since the bonding state can be finely corrected before curing, the impeller 1 according to the present embodiment has more accurate shape and dimensions. high.
  • the impeller 2 according to the second embodiment differs from the impeller 1 of the first embodiment in that the first disk portion 31 that constitutes the first segment SG1 in addition to the second segment SG2 is also composed of fiber reinforced resin.
  • the impeller 2 will be described with a focus on differences from the impeller 1 with reference to FIG. 6.
  • the same components and elements as those of the impeller 1 are denoted by the same reference numerals as those of the impeller 1 in FIG.
  • the first disk portion 31 made of fiber reinforced resin is fixed to the rotary shaft 101 with an adhesive.
  • the impeller 2 is provided with key grooves S1 and S2 in the rotary shaft 101 and the first disk portion 31, respectively, and a key K is inserted into the key grooves S1 and S2.
  • the key grooves S1, S2 and the key K can be provided in a portion corresponding to the grip portion A, for example.
  • the rotary shaft 101 and the first disk portion 31 other than the key grooves S1, S2 and the key K are joined by an adhesive B.
  • the first disk portion 31 is joined to the rotary shaft 101 with an adhesive at the grip portion A portion.
  • the second segment SG2 is joined to the first segment SG1 including the first disk portion 31 fixed to the rotating shaft 101 with an adhesive via the joining layer BL. This joining is the same as that of the impeller 1 of the first embodiment.
  • the 1st disc part 31 which makes 1st segment SG1 is produced by injection molding using fiber reinforced resin (Drawing 8 Step S201).
  • a key groove S2 is formed in the inner periphery of the first disk portion 31.
  • the second segment SG2 in which the second disk portion 35, the blade portion 40 and the cover portion 50 are integrated is integrally manufactured by injection molding using a fiber reinforced resin (step S203 in FIG. 8).
  • the first segment SG1 (first disk portion 31) is fitted to the rotating shaft 101 (FIG. 7A, step S205 in FIG. 8).
  • a key groove S1 is formed in advance on the rotary shaft 101, and a key K is inserted into the key groove S1.
  • An adhesive B is applied to the outer peripheral surface of the first disk portion 31 corresponding to the grip portion A.
  • the key shaft S is fitted to the rotary shaft 101 so that the key groove S2 is inserted into the key K.
  • the key K is pushed in until it hits the back of the keyway S2 (right side in the figure), the fitting operation of the first disk portion 31 and the rotary shaft 101 is completed.
  • the key K can be fixed in advance to the key groove S1 of the rotary shaft 101 with an adhesive. Further, the fixing of the first disk portion 31 and the rotary shaft 101 with the adhesive can be performed only in the key grooves S1 and S2 and the key K portion as long as the bonding strength is allowed.
  • the impeller 2 according to the second embodiment uses a first segment SG1 (first disk portion 31) made of fiber reinforced resin. Therefore, according to 2nd Embodiment, since the weight reduction of the impeller 2 is implement
  • the impeller 2 can be manufactured in a shorter time than the first embodiment.
  • the present invention is not limited to this, and both the first segment SG1 and the second segment SG2 can be made of a metal material. That is, the present invention has the option of configuring the first segment SG1 from a metal material or fiber reinforced resin and configuring the second segment SG2 from a metal material or fiber reinforced resin.
  • the present invention can be applied to a means for increasing the strength of the bonding through the bonding layer BL of the first segment SG1 and the second segment SG2.
  • the rear end surface 32 and the front end surface 37 to which the adhesive is applied can be subjected to phosphate treatment.
  • Phosphate treatment forms a thin micron-order film of a metal salt such as zinc phosphate on the metal surface, but this film has a columnar form, which roughens the surface, thereby increasing the bonding strength of the adhesive.
  • phosphate treatment zinc phosphate treatment, calcium phosphate treatment and iron phosphate treatment are known, but zinc phosphate treatment which can be treated even at room temperature is preferred.
  • a mechanical fit is provided between the first disk part 31 and the second disk part 35.
  • a combined structure can also be provided.
  • the fitting structure 39 is provided on the recess 39 ⁇ / b> A provided on the rear end surface 32 of the first disk portion 31 and the front end surface 37 of the second disk portion 35. It is comprised from the convex part 39B.
  • the convex portion 39B is inserted into the concave portion 39A to constitute the fitting structure 39.
  • the fitting structures 39 are provided at four locations at intervals of 90 ° in the circumferential direction of the first disk portion 31 and the second disk portion 35.
  • the boundary surface between the first disk portion 31 and the second disk portion 35 is along the direction orthogonal to the axis O, but the present invention is not limited to this, and the boundary surface May be inclined with respect to the axis O.

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

Abstract

La présente invention concerne une roue 1, pourvue : d'une partie de disque 30 qui est fixée à un arbre de rotation 101 qui tourne autour d'un axe O, d'une partie de couvercle 50 qui est disposée face à la partie de disque 30, et de multiples parties de lame 40 qui sont disposées entre la partie de disque 30 et la partie de couvercle 50. La roue 1 est caractérisée en ce qu'elle est pourvue : d'un premier segment SG1 formé à partir d'une première partie de disque 31, qui est une partie de la partie de disque 30 située sur un côté de l'axe O ; d'une seconde partie de disque 35, qui est une partie de la partie de disque 30 située de l'autre côté de l'axe O ; d'une partie de couvercle 50 ; d'un second segment SG2 qui est configuré d'un seul tenant avec les parties de lame 40 ; et d'une couche de liaison BL qui lie le premier segment SG1 et le second segment SG2 avec un adhésif.
PCT/JP2018/011963 2017-03-27 2018-03-26 Roue et machine rotative WO2018181084A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US16/491,325 US20200032810A1 (en) 2017-03-27 2018-03-26 Impeller and rotary machine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017-060409 2017-03-27
JP2017060409A JP2018162720A (ja) 2017-03-27 2017-03-27 インペラ、及び、回転機械

Publications (1)

Publication Number Publication Date
WO2018181084A1 true WO2018181084A1 (fr) 2018-10-04

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JP (1) JP2018162720A (fr)
WO (1) WO2018181084A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7588975B2 (ja) * 2020-06-30 2024-11-25 三菱重工コンプレッサ株式会社 回転機械のインペラ及び回転機械
US11982208B2 (en) 2022-10-07 2024-05-14 Hamilton Sundstrand Corporation Two-piece impeller made of multiple materials

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62101007U (fr) * 1985-12-18 1987-06-27
JPH11351192A (ja) * 1998-06-12 1999-12-21 Matsushita Electric Ind Co Ltd 電動送風機
US20080206520A1 (en) * 2007-02-07 2008-08-28 Nissan Motor Co., Ltd. Surface-modified metal member and method of modifying metal surface
US20130272895A1 (en) * 2011-02-24 2013-10-17 Akihiro Nakaniwa Impeller, rotor comprising same, and impeller manufacturing method
US20140341715A1 (en) * 2011-12-14 2014-11-20 Nuovo Pignone S.P.A. Rotary machine including a machine rotor with a composite impeller portion and a metal shaft portion

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62101007U (fr) * 1985-12-18 1987-06-27
JPH11351192A (ja) * 1998-06-12 1999-12-21 Matsushita Electric Ind Co Ltd 電動送風機
US20080206520A1 (en) * 2007-02-07 2008-08-28 Nissan Motor Co., Ltd. Surface-modified metal member and method of modifying metal surface
US20130272895A1 (en) * 2011-02-24 2013-10-17 Akihiro Nakaniwa Impeller, rotor comprising same, and impeller manufacturing method
US20140341715A1 (en) * 2011-12-14 2014-11-20 Nuovo Pignone S.P.A. Rotary machine including a machine rotor with a composite impeller portion and a metal shaft portion

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JP2018162720A (ja) 2018-10-18

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