EP2199610A1 - Electric compressor for vehicle-mounted air conditioner - Google Patents

Electric compressor for vehicle-mounted air conditioner Download PDF

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Publication number
EP2199610A1
EP2199610A1 EP08837816A EP08837816A EP2199610A1 EP 2199610 A1 EP2199610 A1 EP 2199610A1 EP 08837816 A EP08837816 A EP 08837816A EP 08837816 A EP08837816 A EP 08837816A EP 2199610 A1 EP2199610 A1 EP 2199610A1
Authority
EP
European Patent Office
Prior art keywords
case
electric compressor
air conditioner
circumferential surface
vehicle air
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Withdrawn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
EP08837816A
Other languages
German (de)
English (en)
French (fr)
Inventor
Yuki Ichise
Takayuki Watanabe
Takeshi Hirano
Masaki Kawasaki
Takayuki Hagita
Masayuki Ishikawa
Minoru Kawada
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.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
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 Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Publication of EP2199610A1 publication Critical patent/EP2199610A1/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Withdrawn legal-status Critical Current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
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
    • F04B39/121—Casings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F04C23/008—Hermetic pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
    • F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
    • F04C18/0215—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form where only one member is moving
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2230/00—Manufacture
    • F04C2230/20—Manufacture essentially without removing material
    • F04C2230/21—Manufacture essentially without removing material by casting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/30—Casings or housings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/80—Other components
    • F04C2240/808—Electronic circuits (e.g. inverters) installed inside the machine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2201/00—Metals
    • F05C2201/02—Light metals
    • F05C2201/021—Aluminium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2201/00—Metals
    • F05C2201/90—Alloys not otherwise provided for
    • F05C2201/903—Aluminium alloy, e.g. AlCuMgPb F34,37

Definitions

  • the present invention relates to an electric compressor for a vehicle air conditioner.
  • an inverter case that accommodates an inverter unit for supplying electrical power to the electric motor and a pressure case that accommodates, for example, the electric motor or a compression unit are integrally formed by die-casting using, for example, aluminum as a material.
  • shrinkage cavities communicate between the screw holes and a machined surface, in the pressure case, facing the screw holes, and thus, refrigerant in the pressure case tends to leak outside through the shrinkage cavities.
  • the present invention has been conceived to solve the above-described problems, and an object thereof is to provide an electric compressor for a vehicle air conditioner capable of preventing refrigerant leakage.
  • the present invention provides the following solutions.
  • the present invention provides an electric compressor for a vehicle air conditioner, wherein a case is formed by injecting a molten metal into a mold, and a compression unit for compressing a refrigerant is accommodated inside, and wherein a machined portion is formed on only one of an inner circumferential surface in contact with the refrigerant and an outer circumferential surface adjacent to the inner circumferential surface.
  • the present invention it is possible to prevent the machined portion formed at the inner circumferential surface side of the case and the machined portion formed at the outer circumferential surface side from becoming adjacent, thus preventing the refrigerant from leaking from the inside to the outside of the case.
  • the inner circumferential surface or the outer circumferential surface adjacent to the machined portion is not processed, it is possible to leave a casting surface including a chill layer that has fewer cavities, such as shrinkage cavities, on the inner circumferential surface or the outer circumferential surface. Therefore, it is possible to reduce the probability of the above-described cavities passing through from the inside to the outside of the case, thus reducing the incidence of refrigerant leaks.
  • a thickness between the machined portion and an inner circumferential portion, or a thickness between the machined portion and an outer circumferential portion is preferably larger than that between the inner circumferential surface and the outer circumferential surface.
  • a pressure case that accommodates the compression unit and an electrical-equipment case that accommodates electrical parts that control an electric motor for driving the compression unit are preferably integrally provided in the case, and the molten metal is preferably injected from the pressure case side.
  • the pressure case be a substantially cylindrical member having at least a bottom surface, a plurality of ribs that radially extend being provided on the bottom surface, and a suction hole through which the refrigerant flows into the pressure case from outside be provided so as to pass through between the plurality of ribs in the case.
  • the ribs do not block the flow of the refrigerant flowing inside through the suction hole, the shape of the ribs is not restricted. Therefore, the ribs can be formed in any shape required to ensure the strength of the pressure case, thus ensuring the strength of the pressure case.
  • the pressure case be a substantially cylindrical member having at least a bottom surface, a plurality of ribs that radially extend be provided on the bottom surface, a suction hole through which the refrigerant flows into the pressure case from outside be provided so as to pass through between the plurality of ribs in the case, a boss that supports a rotation shaft of the compression unit be provided at the center portion of the bottom surface, and the suction hole be a through-hole extending toward the boss.
  • the refrigerant flowing into the pressure case through the suction hole includes lubricant, such as lubricating oil
  • lubricant such as lubricating oil
  • the boss together with the refrigerant and is supplied between the rotation shaft and the boss. Accordingly, lubrication between the rotation shaft and the boss can be ensured.
  • the pressure case be a substantially cylindrical member having at least a bottom surface, a plurality of ribs that radially extend be provided on the bottom surface, a suction hole through which the refrigerant flows into the pressure case from outside be provided so as to pass through between the plurality of ribs in the case, a discharge hole in which the refrigerant flows out from the pressure case be provided in the pressure case, and the suction hole and the discharge hole be formed substantially in the same direction with respect to the case.
  • the pressure case be a substantially cylindrical member having at least a bottom surface, a plurality of ribs that radially extend be provided on the bottom surface, a suction hole through which the refrigerant flows into the pressure case from outside be provided so as to pass through between the plurality of ribs in the case, and the suction hole be located at a position higher than the central axis of the pressure case when the pressure case is attached to a desired attachment position.
  • the electric compressor for the vehicle air conditioner according to the present invention provides advantages in that it is possible to prevent a machined portion formed at an inner circumferential surface side and a machined portion formed at an outer circumferential surface side in a case from becoming adjacent, as well as to prevent refrigerant from leaking from the inside to the outside of the case.
  • Fig. 1 is a sectional view for explaining, in outline, the configuration of an electric compressor according to an embodiment of the present invention.
  • an electric compressor (electric compressor for a vehicle air conditioner) 1 is applied to the electric compressor that is used for a vehicle air conditioner and whose rotational speed for driving thereof is controlled by an inverter.
  • the electric compressor 1 is provided with a scroll compression unit (compression unit) 3 that compresses a refrigerant used for a vehicle air conditioner, and a motor unit 5 that drives the scroll compression unit 3.
  • a scroll compression unit (compression unit) 3 that compresses a refrigerant used for a vehicle air conditioner
  • a motor unit 5 that drives the scroll compression unit 3.
  • the scroll compression unit 3 is provided with a fixed scroll (not shown) and an orbiting scroll (not shown) that compress the refrigerant, a main shaft (rotation shaft) 11 that transmits a rotational driving force of the motor unit 5 to the orbiting scroll, a housing (case, pressure case) 13 that accommodates the fixed scroll and the orbiting scroll therein, and an upper bearing case (case, pressure case) 15, described below, that supports the main shaft 11.
  • the main shaft 11 is a cylindrical member extending from the motor unit 5 toward the scroll compression unit 3 and transmits the generated rotational driving force by the scroll compression unit 3 to the orbiting scroll to orbitally drive the orbiting scroll.
  • the motor unit 5 is provided with a stator 63 and a rotor 65 that drive the main shaft 11, a motor case (case, pressure case) 67 that accommodates the stator 63 and the rotor 65, and an inverter unit (electrical part) 69 that controls an AC current supplied to the stator 63.
  • Fig. 2 is a perspective view for explaining the configuration of the motor case in Fig. 1 .
  • the motor case 67 is provided with a cylindrical portion (case, pressure case) 77, with a cylindrical shape, that accommodates the stator 63 and the rotor 65, and a box (electrical-equipment case) 83 that accommodates the inverter unit 69.
  • Fig. 3 is a diagram of the box, viewed from an opening side, for explaining the configuration of the motor case in Fig. 2 .
  • Fig. 4 is a diagram of the cylindrical portion, viewed from an opening side, for explaining the configuration of the motor case in Fig. 2 .
  • a plurality of screw holes (machined portions) 101 used for securing the inverter unit 69 are formed in the box 83.
  • the screw holes 101 are formed at edges of the box 83.
  • thick portions 102 that have machining allowance for the screw holes 101 and that have a thickness (plate thickness) substantially the same as that of other portions are formed on a surface of the box 83 facing the cylindrical portion 77.
  • the thick portions 102 have casting surfaces that are not processed.
  • Fig. 5 is a sectional view for explaining the configuration of a portion where a terminal portion is attached in the motor case in Fig. 1 .
  • an opening 111 for connecting the inverter unit 69 and the motor unit 5 is provided in the cylindrical portion 77, and securing bolt holes (machined portions) 113 are formed. Securing bolts for securing a terminal portion 112 that covers the opening 111 are screwed into the securing bolt holes 113.
  • the securing bolt holes 113 are holes that extend from the box 83 toward the cylindrical portion 77 and formed in the box 83.
  • Protrusions 114 that have machining allowance for the securing bolt holes 113 and have a thickness (plate thickness) substantially the same as that of other portions are formed at positions corresponding to the securing bolt holes 113 on an inner circumferential surface 77A of the cylindrical portion 77.
  • the protrusions 114 have casting surfaces that are not processed.
  • the terminal portion 112 can be disposed close to the cylindrical portion 77, thus reducing the size of the electric compressor 1.
  • Fig. 6 is a sectional view for explaining the configuration of a suction portion in the motor case in Fig. 3 .
  • a bottom surface 79 is provided at one end of the cylindrical portion 77, and a suction portion 121 is provided close to the bottom surface 79, as shown in Figs. 4 and 6 .
  • a cylindrical sub-boss (boss) 91 that supports an end of the main shaft 11 is provided at the center portion of the bottom surface 79, and six ribs 93 outwardly extend from the sub-boss 91 in the radial direction at equal intervals.
  • the suction portion 121 is a portion to which an external refrigerant pipe is connected and through which the refrigerant flows into the cylindrical portion 77.
  • the suction portion 121 is disposed higher than the center axis of the electric compressor 1 or the center axis of the main shaft 11.
  • the suction portion 121 is provided with a suction hole 122 through which the refrigerant flows and a mounting bolt hole (machined portion) 123 used for securing the external refrigerant pipe.
  • the suction hole 122 is a through-hole that connects the inside and outside of the cylindrical portion 77 and is a channel through which the refrigerant flows inside the cylindrical portion 77 from outside.
  • the suction hole 122 is formed so as to open between the ribs 93 and to extend toward a sub-boss 91.
  • the suction hole 122 is formed so as to extend substantially parallel with a discharge hole of a discharge portion (not shown).
  • the mounting bolt hole 123 is a hole into which a bolt used for securing the external refrigerant pipe is screwed.
  • the mounting bolt hole 123 is a hole that extends from the outside to the inside of the cylindrical portion 77 and is substantially parallel with the suction hole 122.
  • a thick portion 124 that has machining allowance for the mounting bolt hole 123 and has a thickness (plate thickness) substantially the same as that of other portions is formed on the inner circumferential surface 77A at a position corresponding to the mounting bolt hole 123 in the cylindrical portion 77.
  • the thick portion 124 has a casting surface that is not processed.
  • the motor case 67 is formed by, for example, die-casting, i.e., injecting a molten aluminum alloy into a metal mold.
  • An inlet (sprue gate) for the molten aluminum alloy is preferably disposed on the bottom surface 79.
  • a DC current is supplied from outside of the inverter, is frequency controlled by an electronic device at the inverter unit 69, and is supplied to the motor unit 5.
  • a stator 63 produces an AC magnetic field based on an AC current that is frequency controlled.
  • the rotor 65 generates a rotational driving force due to interaction with the produced AC magnetic field.
  • the rotational driving force generated by the rotor 65 is transmitted to the main shaft 11.
  • the rotational driving force is transmitted to the orbiting scroll at the scroll compression unit 3 via the main shaft 11.
  • the orbiting scroll is driven so as to revolve while restricting its movement with a rotation-preventing portion (not shown).
  • a compression chamber formed between it and the fixed scroll compresses the refrigerant, whose volume is reduced as it moves from an outer circumferential end toward the center.
  • the refrigerant compressed in the compression chamber is discharged into a discharge chamber through a discharge hole of the fixed scroll and discharged outside the housing from the discharge chamber.
  • the thick portions 102 that are not machined are provided on the inner circumferential surface adjacent to, for example, the screw holes 101, it is possible to leave a casting surface including a chill layer or the like that has fewer cavities, such as shrinkage cavities, on the inner circumferential surface. Therefore, it is possible to reduce the probability of the above-described cavities passing through from the inside to the outside of, for example, the cylindrical portion 77, thus reducing the incidence of refrigerant leaks.
  • the suction hole 122 is formed between the ribs 93, it is possible to prevent interference between the suction hole 122 and the ribs 93, thus ensuring the strength of the cylindrical portion 77. More specifically, because the ribs 93 do not block the flow of the refrigerant flowing inside through the suction hole 122, the shape of the ribs 93 is not restricted. Therefore, the ribs 93 can be formed in any shape required to ensure the strength of the cylindrical portion 77, thus ensuring the strength of the cylindrical portion 77.
  • the suction hole 122 is formed so as to extend toward the sub-boss 91, the lubricating oil contained in the refrigerant flowing into the cylindrical portion 77 by passing through the suction hole 122 flows toward the sub-boss 91 together with the refrigerant and is supplied between the main shaft 11 and the sub-boss 91. Accordingly, lubrication between the main shaft 11 and the sub-boss 91 can be ensured.
  • the suction hole 122 and the discharge hole are formed in different directions, because the suction hole 122 and the discharge hole are formed substantially in the same direction, it is possible to reduce the size in the width direction of the cylindrical portion 77, i.e., the size in a direction orthogonal to the center axis of the electric compressor 1.
  • the machined portions such as the screw holes 101
  • the casting surface is left on the inner circumferential surface 77A.
  • the casting surface may be left on the outer circumferential surface of, for example, the cylindrical portion 77, and the machined portions may be formed on the inner circumference.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
EP08837816A 2007-10-09 2008-10-02 Electric compressor for vehicle-mounted air conditioner Withdrawn EP2199610A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2007263367A JP2009091987A (ja) 2007-10-09 2007-10-09 車両空調用電動圧縮機
PCT/JP2008/067953 WO2009048013A1 (ja) 2007-10-09 2008-10-02 車両空調用電動圧縮機

Publications (1)

Publication Number Publication Date
EP2199610A1 true EP2199610A1 (en) 2010-06-23

Family

ID=40549158

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08837816A Withdrawn EP2199610A1 (en) 2007-10-09 2008-10-02 Electric compressor for vehicle-mounted air conditioner

Country Status (4)

Country Link
US (1) US20100028175A1 (ja)
EP (1) EP2199610A1 (ja)
JP (1) JP2009091987A (ja)
WO (1) WO2009048013A1 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111065817A (zh) * 2017-09-05 2020-04-24 三菱重工制冷空调***株式会社 压缩机壳体的制造方法、壳体材料及压缩机壳体

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5669586B2 (ja) * 2011-01-07 2015-02-12 三菱重工業株式会社 圧縮機用モータおよびそれを用いた電動圧縮機
CN107013460B (zh) 2017-04-28 2020-06-30 上海海立新能源技术有限公司 一种压缩机

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JPS5828432B2 (ja) * 1978-06-14 1983-06-15 株式会社日立製作所 斜板式圧縮機
JP2799449B2 (ja) * 1993-12-02 1998-09-17 敏之 塚本 車両用ホイールの鋳型構造
JP3976512B2 (ja) * 2000-09-29 2007-09-19 サンデン株式会社 冷媒圧縮用電動式圧縮機
JP4777541B2 (ja) * 2001-06-08 2011-09-21 パナソニック株式会社 電動機内蔵の圧縮機と、これを搭載した移動車
JP3843809B2 (ja) 2001-11-15 2006-11-08 株式会社デンソー 電動圧縮機
JP3802477B2 (ja) 2002-11-13 2006-07-26 株式会社デンソー 車両用インバータ横設型電動コンプレッサ
JP3997855B2 (ja) * 2002-07-15 2007-10-24 株式会社豊田自動織機 電動コンプレッサ
JP2005180292A (ja) 2003-12-18 2005-07-07 Denso Corp 電動圧縮機
JP2005188441A (ja) 2003-12-26 2005-07-14 Sanden Corp 電動圧縮機
JP4826212B2 (ja) 2005-11-04 2011-11-30 株式会社豊田自動織機 電動コンプレッサ
JP2007162661A (ja) 2005-12-16 2007-06-28 Denso Corp 電動圧縮機

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Title
See references of WO2009048013A1 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111065817A (zh) * 2017-09-05 2020-04-24 三菱重工制冷空调***株式会社 压缩机壳体的制造方法、壳体材料及压缩机壳体
CN111065817B (zh) * 2017-09-05 2022-04-05 三菱重工制冷空调***株式会社 压缩机壳体的制造方法、壳体材料及压缩机壳体

Also Published As

Publication number Publication date
WO2009048013A1 (ja) 2009-04-16
JP2009091987A (ja) 2009-04-30
US20100028175A1 (en) 2010-02-04

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