US20020085937A1 - Scroll type compressor and method of making the same - Google Patents

Scroll type compressor and method of making the same Download PDF

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Publication number
US20020085937A1
US20020085937A1 US10/014,054 US1405401A US2002085937A1 US 20020085937 A1 US20020085937 A1 US 20020085937A1 US 1405401 A US1405401 A US 1405401A US 2002085937 A1 US2002085937 A1 US 2002085937A1
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US
United States
Prior art keywords
scroll member
housing
drive shaft
movable
movable scroll
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.)
Abandoned
Application number
US10/014,054
Other languages
English (en)
Inventor
Hiroyuki Gennami
Kazuhiro Kuroki
Kenji Isomura
Shinji Tsubai
Naohiro Nakajima
Yasushi Watanabe
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.)
Toyota Industries Corp
Original Assignee
Toyota Industries Corp
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 Toyota Industries Corp filed Critical Toyota Industries Corp
Assigned to KABUSHIKI KAISHA TOYOTA JIDOSHOKKI reassignment KABUSHIKI KAISHA TOYOTA JIDOSHOKKI ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: GENNAMI, HIROYUKI, ISOMURA, KENJI, KUROKI, KAZUHIRO, NAKAJIMA, NAOHIRO, TSUBAI, SHINJI, WATANABE, YASUSHI
Assigned to KABUSHIKI KAISHA TOYOTA JIDOSHOKKI reassignment KABUSHIKI KAISHA TOYOTA JIDOSHOKKI CONFIRMATIN OF EARLIER ASSIGNMENT Assignors: GENNAMI, HIROYUKI, ISOMURA, KENJI, KUROKI, KAZUHIRO, TSUBAI, SHINJI
Publication of US20020085937A1 publication Critical patent/US20020085937A1/en
Assigned to KABUSHIKI KAISHA TOYOTA JIDOSHOKKI reassignment KABUSHIKI KAISHA TOYOTA JIDOSHOKKI CORRECTIVE ASSIGNMENT TO INSERT THE FIFTH AND SIXTH ASSIGNOR'S PREVIOUSLY RECORDED AT REEL 012968 FRAME 0501. (ASSIGNMENT OF ASSIGNOR'S INTEREST) Assignors: GENNAMI, HIROYUKI, ISOMURA, KENJI, KUROKI, KAZUHIRO, NAKAJIMA, NAOHIRO, TSUBAI, SHINJI, WATANABE, YASUSHI
Abandoned 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
    • 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
    • F04C2240/00—Components
    • F04C2240/60—Shafts
    • F04C2240/603—Shafts with internal channels for fluid distribution, e.g. hollow shaft

Definitions

  • the present invention relates to a scroll type compressor that is a type of a rotary compressor. More particularly, the present invention relates to a structure of the compressor and a method of making the same.
  • Japanese Unexamined Patent Publication No. 6-280757 discloses a general scroll type compressor.
  • This scroll type compressor compresses refrigerant gas by reducing the volume of the compression chamber as a movable scroll member orbits with respect to a fixed scroll member.
  • An inlet for introducing the refrigerant gas into the compression chamber is formed through a fixed scroll base plate.
  • a movable scroll base plate is provided with a discharge port and a rood-type discharge valve for discharging compressed refrigerant gas at an innermost compression chamber whose volume is the smallest.
  • the pressurized refrigerant gas discharged from compression chamber via the reed-type discharge valve flows into a motor chamber, and circulates from the motor chamber to an external refrigerant circuit.
  • a shaft sealing member is disposed between a drive shaft driving a movable scroll member and a housing rotatably supporting the drive shaft.
  • Part of the compressed refrigerant gas discharged into the motor chamber tends to leak into a relatively low pressure region through any gap between the drive shaft and a housing.
  • the refrigerant gas is inhibited from leaking into the relatively low pressure region by disposing the shaft sealing member between the drive shaft and the housing.
  • the present invention addresses the above-mentioned problems traceable to a power loss and a sealing performance of the shaft sealing member disposed between the drive shaft and the housing in the compressor by reducing the power loss and leakage of gas about the shaft sealing member.
  • a scroll type compressor has a housing, a fixed scroll member, a drive shaft, a movable scroll member, an inlet and a discharge device.
  • the fixed scroll member is fixed to the housing.
  • the drive shaft is rotatably supported by the housing.
  • the movable scroll member is accommodated in tho housing, and faces the fixed scroll member.
  • the movable scroll member and the fixed scroll member define a compression region.
  • the inlet is formed through the housing.
  • the discharge device is provided for one of the movable scroll member and the fixed scroll member. Gas introduced into the compressor via the inlet is compressed in the. compression region by orbiting the movable scroll member relative to the fixed scroll member by rotation of the drive shaft.
  • the pressurized gas is discharged via the discharge device.
  • the present invention also provides a method of making a scroll type compressor.
  • the method includes the steps of providing a discharge device for one of a movable scroll member and a fixed scroll member, and disposing a plane bearing between a drive shaft and a housing. Accordingly, sealing performance of the shaft scaling member can be ensured and the power loss can be reduced.
  • FIG. 1 is a longitudinal cross-sectional view of a scroll type compressor according to an embodiment of the present invention.
  • FIG. 1 is a longitudinal cross-sectional view of a scroll type compressor according to the embodiment of the present invention.
  • the left side and the right side in FIG. 1 correspond to the front end and the rear end, respectively.
  • a movable scroll member 20 and its drive mechanism are hermetically accommodated in a housing assembly as a housing of a scroll type compressor 1 , and the housing assembly is constituted of a fixed scroll member 2 , a center housing 4 and a motor housing 6 .
  • the center housing 4 is connected to the fixed scroll member 2 at its front end, and is connected to the motor housing 6 at its rear end.
  • a drive shaft 8 is rotatably supported by both the center housing 4 via a plane bearing 62 (corresponding to a plane bearing in the present invention) and the motor housing 6 via a radial bearing 12 .
  • the plane bearing 62 is accommodated in a boss 4 a of the center housing 4 .
  • the respective walls 28 , 30 of the fixed and movable scroll members 2 , 20 are aligned to engage with each other.
  • the movable scroll member 20 orbits in accordance with the rotation of the crankshaft 14 , creating traveling points of contact between the two walls 28 , 30 .
  • the volumes of the compression chambers 32 are progressively reduced, thus compressing the refrigerant gas as gas trapped in the volumes between the spiral walls 28 , 30 and discharging the refrigerant gas from a discharge port 50 .
  • a balance weight 18 cancels centrifugal force generated by the orbital motion of the movable scroll member 20 .
  • All orbiting mechanism is constituted of the crankshaft 14 , which integrally rotates with the drive shaft 8 , a bushing 16 , and a plane bearing 22 , which is interposed between the crankshaft 14 and a boss 24 a of the movable, scroll member 20 .
  • Two mutually parallel planes (a pair of planes) 14 a are formed on a circumferential surface of the crankshaft 14 , and the crankshaft 14 is fitted in the bushing 16 so that the bushing 16 can integrally rotate with the crankshaft 14 through the planes.
  • the balance weight, 18 is connected to the rear end of the bushing 16 so as to rotate integrally with the bushing 16
  • the movable scroll member 20 is connected to the bushing 16 so as to face the fixed scroll member 2 so that the movable scroll member 20 can relatively rotate with the bushing 16 via the plane bearing 22 .
  • the plane bearing 22 is accommodated in a cylindrical boss 24 a extending from the rear surfaces of the base plate 24 of the movable scroll member 20 .
  • a reed-type discharge valve mechanism 52 which opens and closes the discharge port 50 , is affixed to the rear surface of the movable scroll base plate 24 (an opposite surface relative to the crankshaft 14 ).
  • This discharge valve mechanism 52 has a reed valve 54 disposed at the discharge port 50 , a retainer 56 supporting the reed valve 54 and a bolt 58 fixing the reed valve 54 and the retainer 56 to the movable scroll base plate 24 , and is accommodated in a discharge valve chamber 25 which is bored at the rear surface of the movable scroll base plate 24 .
  • the reed valve 54 opens and closes due to pressure difference between the compression chamber 32 communicated with the discharge port 50 and a high pressure chamber 70 .
  • a discharge device is constituted of the discharge port 50 and the discharge valve mechanism 52 .
  • a plurality of recesses 41 (e.g. four recesses) is formed on an identical circumference in the front end surface of the center housing 4 in an equiangular positions.
  • Movable pins 40 fixed to the movable scroll base plate 24 are loosely fitted into the associated recesses so that the movable pins 40 can contact with fixed pins 42 fixed to the center housing 4 .
  • the recesses 41 , the fixed pins 42 and the movable pins 40 prevent the movable scroll member 20 from rotating even if the crankshaft 14 rotates.
  • a rotation preventing mechanism is constituted of the recesses 41 , the fixed pins 42 and the movable pins 40 .
  • a stator 46 is fixed to an inner circumferential surface of the motor housing 6 , and a rotor 48 is fixed to the drive shaft 8 .
  • the stator 46 and the rotor 48 constitute the motor.
  • the rotor 48 and the drive shaft 8 integrally rotate by energizing the stator 46 .
  • the crankshaft 14 of the drive shaft 8 rotates, the movable scroll member 20 orbits, and the refrigerant gas is introduced through an inlet 44 , which is formed through the fixed scroll member 2 , and the refrigerant gas flows from a peripheral side of both the scroll members 2 , 20 in between the fixed scroll base plate 26 and thc movable scroll base plate 24 .
  • the movable scroll member 20 orbits, the movable pins 40 slide along the outer circumferential surfaces of the assoiciated fixed pins 42 .
  • the movable scroll member 20 which can relatively rotate with respect to the crankshaft 14 via the plane bearing 22 , orbits about the axis of the drive shaft 8 without itself rotating.
  • the refrigerant gas is introduced through the inlet 44 , and is closed in the compression chamber 32 .
  • the compression chamber 32 moves toward the center, the refrigerant gas accordingly is inwardly led to the center of the movable scroll member 20 in parallel with compressing and pressurizing the refrigerant gas.
  • the pressurized refrigerant gas flows into the discharge port 50 , which is communicated with the compression chamber 32 , the pressure of which is the highest among the compression chambers 32 , defined at the center of the movable scroll base plate 24 .
  • the compressed refrigerant gas passing through the discharge port 50 and the discharge valve mechanism 52 is discharged into the high pressure chamber 70 inside the boss 24 a .
  • This high pressure chamber 70 communicates with the motor chamber 6 a via a first axial passage 72 formed within the drive shaft 8 (including the crankshaft 14 ), and the. refrigerant gas flowed into the motor chamber 6 a is discharged from a second axial passage 74 formed within the drive shaft 8 to an external refrigerant circuit via an outlet 76 , which is formed through a motor housing 6 .
  • the motor is cooled by the refrigerant gas while the refrigerant gas is flowing from the first axial passage 72 to the second axial passage 74 .
  • the plane bearing 62 also functions so as to inhibit the pressurized refrigerant gas in the motor chamber 6 a from leaking into the relatively low pressure region adjacent to the rear surface of the movable scroll base plate 24 via any gap between the drive shaft 8 and the center housing 4 . Accordingly, such structure ensures the sealing performance about the drive shaft 8 . Moreover, lubricant contained in the refrigerant gas occupies a small gap between the drive shaft 8 and the plane bearing 62 .
  • the discharge port 50 and the discharge valve mechanism 52 are disposed at the rear surface of the movable scroll base plate 24 , and the pressurized refrigerant gas is discharged to the roar surface side of the movable scroll base plate 24 , so that the plane bearing disposed at the hearing portion of the drive shaft 8 is efficient.
  • part of the pressurized refrigerant gas in the high pressure chamber 70 and the motor chamber 80 6 a leaks due to the pressure difference, that is, leaks to the intermediate pressure chamber 78 , then to the low pressure chamber 79 at the rear surface side of the movable scroll base plate 24 .
  • the seal 80 is disposed downstream to the plane bearings 22 , 62 , each of which has a seal function, the refrigerant gas can further be inhibited from leaking into the rear surface side of the movable scroll base plate 24 , with a consequence of reduced leakage of the refrigerant gas.
  • the intermediate pressure chamber 78 is defined in the vicinity of the rear surface of the movable scroll hase plate 24 , the. force pressing against the movable scroll member 20 increases. Accordingly, the force pressing the movable scroll member 20 against the fixed scroll member 2 increases, with a consequence of reduced leakage of the refrigerant gas from the compression chambers 32
  • the refrigerant gas in the motor chamber 6 a leaking into the intermediate pressure chamber 78 via the gap between the drive shaft 8 and the center housing 4 can be retrained. Furthermore the seal 80 maintains pressure in the intermediate pressure chamber 78 . Therefore, the refrigerant gas leaking from the motor chamber 6 a into the intermediate pressure chamber 78 due to the pressure difference between the front and rear sides of the plane bearing 62 can be minimized
  • the drive shaft 8 smoothly rotates due to the bearing function of the plane bearing 62 , and the power loss due to the friction generated between the drive shaft 8 and the center housing 4 can be reduced, as compared with disposing another shaft scaling member therebetween.
  • the plane bearing 62 disposed at the bearing portion of the drive shift 8 is efficient.
  • the discharge port 50 and the discharge valve mechanism 52 are disposed at the movable scroll base plate 24 , the passage of the refrigerant gas flowing from the discharge valve mechanism 52 into the motor chamber 6 a can simply be constructed.
  • the thrust bearing 60 receiving the thrust force acting on the drive shaft 8 is disposed on the front end surface of the center housing 4 .
  • the position of the thrust bearing 60 is not limited to that location, but can variously be modified for other situations.
  • the thrust bearing 60 may be disposed on the rear end surface of the center housing 4 wholly or partially surrounding the drive shaft 8 .
  • the seal 80 is disposed at the front end surface of the center housing 4 between the movable scroll base plate 24 and the center housing 4 .
  • the seal 80 may be disposed at the rear end surface of the movable scroll base plate 24 .
  • the discharge port 50 and the discharge valve mechanism 52 are provided for the, movable scroll member 20 .
  • the discharge port 50 and the discharge valve mechanism 52 may be provided for the fixed scroll member 2 , which is shown in FIG. 2.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
US10/014,054 2000-12-12 2001-12-10 Scroll type compressor and method of making the same Abandoned US20020085937A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2000-377934 2000-12-12
JP2000377934A JP2002180978A (ja) 2000-12-12 2000-12-12 スクロール型圧縮機およびガス圧縮方法

Publications (1)

Publication Number Publication Date
US20020085937A1 true US20020085937A1 (en) 2002-07-04

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ID=18846588

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/014,054 Abandoned US20020085937A1 (en) 2000-12-12 2001-12-10 Scroll type compressor and method of making the same

Country Status (3)

Country Link
US (1) US20020085937A1 (ja)
JP (1) JP2002180978A (ja)
DE (1) DE10160722A1 (ja)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1626178A1 (en) * 2004-08-09 2006-02-15 Anest Iwata Corporation Scroll vacuum pump
US20200318638A1 (en) * 2017-09-05 2020-10-08 Mitsubishi Heavy Industries Thermal Systems, Ltd. Method for manufacturing compressor casing, casing blank, and compressor casing
US11788541B2 (en) 2020-05-18 2023-10-17 Dover Pumps & Process Solutions Segment, Inc. High pressure gas sealing

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102086349B1 (ko) 2018-08-31 2020-03-09 엘지전자 주식회사 전동식 압축기

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1626178A1 (en) * 2004-08-09 2006-02-15 Anest Iwata Corporation Scroll vacuum pump
US20200318638A1 (en) * 2017-09-05 2020-10-08 Mitsubishi Heavy Industries Thermal Systems, Ltd. Method for manufacturing compressor casing, casing blank, and compressor casing
US11454236B2 (en) * 2017-09-05 2022-09-27 Mitsubishi Heavy Industries Thermal Systems, Ltd. Method for manufacturing compressor casing, casing blank, and compressor casing
US11788541B2 (en) 2020-05-18 2023-10-17 Dover Pumps & Process Solutions Segment, Inc. High pressure gas sealing

Also Published As

Publication number Publication date
DE10160722A1 (de) 2002-10-02
JP2002180978A (ja) 2002-06-26

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AS Assignment

Owner name: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI, JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:GENNAMI, HIROYUKI;KUROKI, KAZUHIRO;ISOMURA, KENJI;AND OTHERS;REEL/FRAME:012730/0803

Effective date: 20011217

AS Assignment

Owner name: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI, JAPAN

Free format text: CONFIRMATIN OF EARLIER ASSIGNMENT;ASSIGNORS:GENNAMI, HIROYUKI;KUROKI, KAZUHIRO;ISOMURA, KENJI;AND OTHERS;REEL/FRAME:012968/0501

Effective date: 20020521

AS Assignment

Owner name: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI, JAPAN

Free format text: CORRECTIVE ASSIGNMENT TO INSERT THE FIFTH AND SIXTH ASSIGNOR'S PREVIOUSLY RECORDED AT REEL 012968 FRAME 0501;ASSIGNORS:GENNAMI, HIROYUKI;KUROKI, KAZUHIRO;ISOMURA, KENJI;AND OTHERS;REEL/FRAME:013336/0562

Effective date: 20020521

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION