EP0468605B1 - Scroll type fluid machinery - Google Patents

Scroll type fluid machinery Download PDF

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Publication number
EP0468605B1
EP0468605B1 EP91250153A EP91250153A EP0468605B1 EP 0468605 B1 EP0468605 B1 EP 0468605B1 EP 91250153 A EP91250153 A EP 91250153A EP 91250153 A EP91250153 A EP 91250153A EP 0468605 B1 EP0468605 B1 EP 0468605B1
Authority
EP
European Patent Office
Prior art keywords
scroll
revolving
drive bushing
center
revolving 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.)
Expired - Lifetime
Application number
EP91250153A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0468605A1 (en
Inventor
Hiroaki C/O Mitsubishi Jukogyo K.K. Kondo
Takahisa C/O Mitsubishi Jukogyo K.K. Hirano
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
Priority claimed from JP8996990U external-priority patent/JPH0741843Y2/ja
Application filed by Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Publication of EP0468605A1 publication Critical patent/EP0468605A1/en
Application granted granted Critical
Publication of EP0468605B1 publication Critical patent/EP0468605B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/003—Systems for the equilibration of forces acting on the elements of the machine
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C1/00—Rotary-piston machines or engines
    • F01C1/02—Rotary-piston machines or engines 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
    • F01C1/0207—Rotary-piston machines or engines 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
    • F01C1/0215—Rotary-piston machines or engines 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

Definitions

  • the present invention relates to a scroll type fluid machinery used as a compressor, an expansion machinery and the like.
  • a radius of revolution variable mechanism for varying a radius of revolution in a solar motion of a revolving scroll automatically in accordance with the variation in gas pressure and a centrifugal force applied to the revolving scroll of a scroll type compressor has been disclosed in Japanese Patent Provisional Publication No. 59-120794 (No. 120794/1984).
  • an oscillating bearing 03 is fitted into a slide hole 02 bored on an upper end surface of a rotary shaft 01 so as to be slidable in a longitudinal direction but unable to rotate on its axis, and a pin 05 projecting downward from a central part of an underside of an end plate 04a of a revolving scroll 04 is inserted into this oscillating bearing 03 so as to be able to rotate relatively as shown in Fig. 5 and Fig. 6.
  • a spiral wrap 06b set up on an inner surface of an end plate 06a of a stationary scroll 06 is engaged mutually with a spiral wrap 04b set up on an inner surface of the end plate 04a of the revolving scroll 04 so as to delimit a compression chamber 07.
  • a numeral 08 denotes a frame
  • 09 denotes a thrust bearing for supporting thrust acting on the revolving scroll 04
  • 010 denotes a bearing for supporting the upper end of the rotary shaft 01
  • O1 denotes a shaft center of a rotary shaft 01
  • O2 denotes a center of a pin 05
  • r denotes eccentricity between O1 and O2
  • ⁇ denotes an inclination of a slide hole 02 with respect to the direction of eccentricity.
  • the rotation is transmitted to the revolving scroll 04 through the slide hole 02, the oscillating bearing 03 and the pin 05.
  • the revolving scroll 04 revolves in a solar motion while making its circular orbit with eccentricity r as a radius in a state that the rotation on its axis is checked by a mechanism for checking the rotation on its axis not shown.
  • a gas is suctioned into a compression chamber 07 and moves toward the center of the spiral while the compression chamber 07 is reducing the volume thereof, the gas is compressed gradually and reaches a central chamber 012, and is discharged therefrom through a discharge port 011.
  • a centrifugal force Fc is applied in an eccentric direction to the revolving scroll 04 by the revolution in a solar motion of the revolving scroll 04, and a gas force Fg acts in a direction which meets at right angles with the centrifugal force Fc by the gas pressure in the compression chamber 07.
  • a composite force F of these centrifugal force Fc and gas force Fg is applied to the center O2 of the pin 05.
  • W is the weight of the revolving scroll
  • r is a radius of revolution in a solar motion of the revolving scroll
  • ⁇ is a revolving angular velocity of the revolving scroll
  • g is acceleration of gravity.
  • the component of force F' of the composite force F is expressed by the following expression (4):
  • F' Fcos ( ⁇ + ⁇ ) (4)
  • the contact pressure F'' is expressed by the following expression (5):
  • the centrifugal force Fc acting on the revolving scroll 04 becomes larger in accordance with increase of revolving angular velocity ⁇ of the revolving scroll 04 as it is apparent from the expression (1).
  • the centrifugal force Fc becomes larger, the angle ⁇ becomes smaller as it is apparent from the expression (3). Accordingly, the component of force F' and the contact pressure F'' become larger as it is apparent from the expressions (4) and (5).
  • EP-A-91 544 as well as EP-A-122 066 disclose a scroll type fluid machinery in which a stationary scroll and a revolving scroll in which spiral wraps are set up at end plates, are engaged with each other, a drive bushing is fitted rotatably into a boss projected at the central part of the outer surface of the end plate of said revolving scroll and a drive pin projecting from the rotary shaft is fitted slidably (in the sense of rotatably sliding) into a slide hole bored in the drive bushing, wherein a counter weight wich generates a centrifugal force having an opposite direction to a centrifugal force acting on said revolving scroll at the time of revolving motion in a solar motion thereof is provided on said drive bushing and wherein the centrifugal force generated by the counter weight is made to accord substantially with the centrifugal force acting by revolution in a solar motion of the revolving scroll.
  • the gist of the present invention is as described in the following item.
  • a scroll type fluid machinery in which a stationary scroll and a revolving scroll in which spiral wraps are set up at end plates, respectively, are engaged with each other, a drive bushing is fitted rotatably into a boss projected at the central part of the outer surface of the end plate of the revolving scroll, and a drive pin projecting from the rotary shaft is fitted slidably into a slide hole bored in the drive bushing, characterized in that a balance weight for balancing dynamic unbalance caused by revolving motion in a solar motion of the revolving scroll is provided on the drive bushing, and an axial position of the center of gravity of the balance weight is made to accord with the axial center of the drive bushing substantially.
  • Fig. 1 and Fig. 2 show an example similar to prior art, wherein Fig. 1 is a longitudinal sectional view of a principal part and Fig. 2 is a cross-sectional view taken along a line II-II in Fig. 1.
  • Fig. 3 and Fig. 4 show an embodiment of the present invention, wherein Fig. 3 is a longitudinal sectional view of a principal part and Fig. 4 is a front view in a state that the revolving scroll is removed.
  • Fig. 5 and Fig. 6 show an example of a conventional scroll type compressor, wherein Fig. 5 is a partial longitudinal sectional view and Fig. 6 is a cross-sectional view taken along a line VI-VI in Fig. 5.
  • Fig. 1 and Fig. 2 show examples similar to the prior art.
  • a stationary scroll 1 consists of an end plate 1a and a spiral wrap 1b set up on the inner surface thereof.
  • a revolving scroll 2 consists of an end plate 2a and a spiral wrap 2b set up on the inner surface thereof.
  • a cylindrical boss 4 is projected at the central part of the outer surface of the end plate 2a of the revolving scroll 2, and a drive bushing 5 is fitted rotatably into the boss 4 through a bearing 6.
  • a slide hole 7 is bored in the drive bushing 5, and a drive pin 9 projecting from an end surface of a rotary shaft 8 with eccentricity by r from a shaft center O1 thereof is fitted into the slide hole 7.
  • the section of the slide hole 7 is formed into a notched circle obtained by notching a circle with a straight line which is inclined in a particular direction as shown in Fig. 2. Further, the section of the eccentric drive pin 9 is also formed into a notched circle having a diameter smaller than that of above-mentioned notched circle and having a same configuration as the notched circle.
  • a straight line portion 9a of the drive pin 9 comes in contact along a straight line portion 7a of the slide hole 7, and thus, the drive pin 9 may slide therealong and move in all directions within a range of a clearance between the inner peripheral surface of the slide hole 7 and the outer peripheral surface of the pin 9.
  • a counter weight 10 is attached fixedly to the drive bushing 5, and the counter weight 10 generates a centrifugal force in a direction opposite to that of a centrifugal force acting on the revolving scroll 2 at the time of revolution in a solar motion thereof.
  • the driving force is transmitted to the drive bushing 5 from the straight line portion 9a of the drive pin 9 through the straight line portion 7a of the slide hole 7, and transmitted further to the revolving scroll 2 through the bearing 6 and the boss 4.
  • the revolving scroll 2 revolves in a solar motion while making a circular orbit with the eccentricity r as a radius and with the shaft center O1 of the rotary shaft 8 as the center.
  • the gas taken into the compression chambers 3 is compressed gradually and reaches a central chamber 11 as the compression chambers 3 move toward the center of the spiral while reducing volumes thereof, and is discharged therefrom through a discharge port 12.
  • the axial position of the center of gravity G of the balance weight 10 is located at a lower part in an axial direction of the drive bushing 5, and the drive bushing 5 and the balance weight 10 are just placed so as to slide on the upper end surface of the rotary shaft 8 and the eccentric drive pin 9 is just fitted into the slide hole 7 slidably. Therefore, the balance weight 10 and the drive bushing 5 formed in one body therewith are rotated inclining clockwise in Fig. 1 by the centrifugal force F acting on the center of gravity of the balance weight 10 at the time of revolution in a solar motion of the revolving scroll 2. As a result, there have been such problems that offset working is produced on the rotary bearing 6 and the lower end surface of the drive bushing 5 also works on the upper end face of the rotary shaft 8 in an offset manner.
  • the present invention provides a scroll type fluid machinery in which above-described problems are solved.
  • Fig. 3 and Fig. 4 show an embodiment of the present invention.
  • the axial position of the center of gravity G of the balance weight 10 is made to almost accord with the center in an axial direction of the drive bushing 5 by increasing the thickness in a vertical direction of the balance weight 10.
  • the drive bushing 5 and the balance weight 10 fixed thereto also revolves in a solar motion with above-mentioned revolving motion, and a centrifugal force F acts on the balance weight 10 at the center of gravity G. Since the axial position of the center of gravity G is in accord with the center in an axial direction of the drive bushing 5 substantially, however, the moment of inclined rotation of the drive bushing 5 based on the centrifugal force F disappears or reduces remarkably.
  • the axial position of the center of gravity of the balance weight is made to accord substantially with the axial center of the drive bushing as described above.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Rotary Pumps (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
EP91250153A 1990-07-24 1991-06-11 Scroll type fluid machinery Expired - Lifetime EP0468605B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP19570190 1990-07-24
JP195701/90 1990-07-24
JP89969/90U 1990-08-28
JP8996990U JPH0741843Y2 (ja) 1990-08-28 1990-08-28 スクロール型流体機械

Publications (2)

Publication Number Publication Date
EP0468605A1 EP0468605A1 (en) 1992-01-29
EP0468605B1 true EP0468605B1 (en) 1994-11-02

Family

ID=26431347

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91250153A Expired - Lifetime EP0468605B1 (en) 1990-07-24 1991-06-11 Scroll type fluid machinery

Country Status (6)

Country Link
EP (1) EP0468605B1 (ko)
KR (1) KR960000092B1 (ko)
CN (1) CN1020497C (ko)
AU (1) AU634059B2 (ko)
CA (1) CA2042203C (ko)
DE (1) DE69104927T2 (ko)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3105714B2 (ja) * 1993-09-03 2000-11-06 三菱重工業株式会社 スクロ−ル型流体機械用ドライブブッシュ
JP3236144B2 (ja) * 1993-09-14 2001-12-10 株式会社デンソー 圧縮機
JP2682790B2 (ja) * 1993-12-02 1997-11-26 株式会社豊田自動織機製作所 スクロール型圧縮機
JPH07324689A (ja) * 1994-05-31 1995-12-12 Mitsubishi Heavy Ind Ltd スクロール型流体機械
US5496157A (en) * 1994-12-21 1996-03-05 Carrier Corporation Reverse rotation prevention for scroll compressors
LU91082B1 (fr) * 2004-06-04 2005-12-05 Wurth Paul Sa Dispositif pour remplacer la rigole principale d'un haut fourneau.
US9909586B2 (en) * 2012-03-23 2018-03-06 Bitzer Kuehlmaschinenbau Gmbh Crankshaft with aligned drive and counterweight locating features
CN111089055B (zh) * 2018-10-23 2024-09-06 谷轮环境科技（苏州）有限公司 涡旋压缩机
JP7439690B2 (ja) * 2020-08-05 2024-02-28 株式会社デンソー 圧縮機、圧縮機の製造方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59120794A (ja) * 1982-12-27 1984-07-12 Mitsubishi Electric Corp スクロ−ル圧縮機

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5819875B2 (ja) * 1980-03-18 1983-04-20 サンデン株式会社 スクロ−ル型圧縮機
JPS5979086A (ja) * 1982-10-27 1984-05-08 Hitachi Ltd スクロ−ル流体機械
JPS59142480U (ja) * 1983-03-15 1984-09-22 サンデン株式会社 スクロ−ル型流体装置
US4954057A (en) * 1988-10-18 1990-09-04 Copeland Corporation Scroll compressor with lubricated flat driving surface

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59120794A (ja) * 1982-12-27 1984-07-12 Mitsubishi Electric Corp スクロ−ル圧縮機

Also Published As

Publication number Publication date
DE69104927T2 (de) 1995-03-09
EP0468605A1 (en) 1992-01-29
CA2042203A1 (en) 1992-01-25
KR920002929A (ko) 1992-02-28
AU7645291A (en) 1992-01-30
DE69104927D1 (de) 1994-12-08
CN1058456A (zh) 1992-02-05
CA2042203C (en) 1996-02-13
KR960000092B1 (ko) 1996-01-03
CN1020497C (zh) 1993-05-05
AU634059B2 (en) 1993-02-11

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