GB2500003A - Scroll fluid machine - Google Patents

Scroll fluid machine Download PDF

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Publication number
GB2500003A
GB2500003A GB201203866A GB201203866A GB2500003A GB 2500003 A GB2500003 A GB 2500003A GB 201203866 A GB201203866 A GB 201203866A GB 201203866 A GB201203866 A GB 201203866A GB 2500003 A GB2500003 A GB 2500003A
Authority
GB
United Kingdom
Prior art keywords
orbiting
rotating shaft
shaft
scroll
fixed
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.)
Granted
Application number
GB201203866A
Other versions
GB201203866D0 (en
GB2500003B (en
Inventor
Booseok Hwang
Kwangseon Hwang
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.)
RichStone Ltd Japan
RichStone Ltd Korea
Original Assignee
RichStone Ltd Japan
RichStone Ltd Korea
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 RichStone Ltd Japan, RichStone Ltd Korea filed Critical RichStone Ltd Japan
Priority to GB201203866A priority Critical patent/GB2500003B/en
Publication of GB201203866D0 publication Critical patent/GB201203866D0/en
Publication of GB2500003A publication Critical patent/GB2500003A/en
Application granted granted Critical
Publication of GB2500003B publication Critical patent/GB2500003B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • 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
    • F01C17/00—Arrangements for drive of co-operating members, e.g. for rotary piston and casing
    • F01C17/06—Arrangements for drive of co-operating members, e.g. for rotary piston and casing using cranks, universal joints or similar elements
    • F01C17/066—Arrangements for drive of co-operating members, e.g. for rotary piston and casing using cranks, universal joints or similar elements with an intermediate piece sliding along perpendicular axes, e.g. Oldham coupling
    • 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
    • F01C21/02—Arrangements of bearings
    • 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
    • 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
    • F04C18/023—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 both members are moving
    • F04C18/0238—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 both members are moving with symmetrical double wraps
    • 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
    • F04C2240/50—Bearings
    • F04C2240/52—Bearings for assemblies with supports on both sides
    • 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
    • F04C2240/50—Bearings
    • F04C2240/56—Bearing bushings or details thereof
    • 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
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/0042—Driving elements, brakes, couplings, transmissions specially adapted for pumps
    • F04C29/0085—Prime movers
    • 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
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/02—Lubrication; Lubricant separation
    • F04C29/021—Control systems for the circulation of the lubricant

Abstract

A scroll fluid machine such as a pump or an expander has an orbiting scroll wrap 1 and a pair of fixed scrolls 2, 3. The orbiting scroll is supported by a hollow orbiting shaft 1D which extends through the fixed scrolls and is mounted at its ends by orbiting bearings 12, 14 fixed to eccentric portions 6A, 6B of a rotating shaft. A self-rotation prevention mechanism, such as cooperating fixed key grooves and orbiting grooves joined by an Oldhams ring, is provided at one end of the orbiting shaft 1D. Preferably a portion of the shaft between the orbiting bearings is coaxial with the rotation axis and in one arrangement there are also two balance weights 22, 23 secured to the rotating shaft. The use of the hollow orbiting shaft extending through the fixed scrolls is designed to reduce the temperature to which the orbiting bearings are exposed.

Description

SCROLL FLUID MACHINE
BACKGROUND OF THE INVENTION 1. Technical Field 5 The invention relates to a scroll fluid machine such as a compressor, a vacuum pump, a blower, and an expander. 2 . Background Art
A scroll compressor is proposed, which is configured to drive the center part of an orbiting scroll having wraps on both 10 sides such that an orbiting scroll performs an orbiting motion. For example, a scroll fluid machine as described in Japanese published unexamined application JP, 2010-77913,A (8 April 2010) is configured such that a drive shaft passes through the hollow portion of the center part of the orbiting scroll and the drive 15 shaft is rotatably supported on both sides. The intermediate part of the drive shaft passing through the center part of the orbiting scroll is an eccentric shaft. An eccentric bearing is provided between the eccentric shaft and the orbiting scroll.
20 SUMMARY OF THE INVENTION Technical Problem
In a conventional scroll fluid machine, a orbiting bearing is provided in the hollow portion of the center part of an orbiting scroll. Fluid is subjected to a change in temperature 25 due to compression when using a compressor or a vacuum pump, whereby the center part of the orbiting scroll is heated to a high temperature. In an expander, since high-temperature high-pressure fluid inflows, the center part of the orbiting scroll is heated to a high temperature. Thus, there has been a problem 30 that the orbiting bearing is heated to a high temperature, thereby reducing the durability of the orbiting bearing.
1
The present invention addresses the aforementioned problem and an object of the present invention is to provide a scroll fluid machine which has a high-durability orbiting bearing. Technical Solution
5 In the invention according to claim 1, a scroll fluid machine is constituted of a combination of an orbiting scroll that has a spiral wrap on both surfaces of a paneling and a pair of fixed scrolls that has a spiral wrap on one surface of a paneling, wherein a hollow orbiting shaft is provided at the 10 center part of said orbiting scroll to pass through said fixed scroll; a rotating shaft passes through the hollow portion of said orbiting shaft such that it is rotatably supported by a pair of covers provided on the outer surface side of said fixed scroll; orbiting bearings are provided on both ends of said 15 orbiting shaft to fit an eccentric portion provided on said rotating shaft; and a self-rotation prevention mechanism of said orbiting scroll is provided on one end of said orbiting shaft.
In the invention according to claim 2, said eccentric portion is provided only at the position of said rotating shaft 20 corresponding to said orbiting bearing, and the intermediate portion between the eccentric portions of said rotating shaft is formed coaxially with the rotation center axis.
In the invention according to claim 3, said self-rotation prevention mechanism is constituted of a pair of fixed-side key 25 grooves provided coupled with said fixed scroll on one side; a pair of orbiting-side key grooves provided so as to cross orthogonally to said fixed-side key grooves in an orbiting bearing housing which is provided on said orbiting shaft to accommodate said orbiting bearing; and an Oldham's ring having a 30 pair of Oldham's keys fitting said fixed-side key grooves and a pair of Oldham's keys fitting said orbiting-side key grooves.
2
In the invention according to claim 4, a 1st balance weight is attached to said rotating shaft between said orbiting bearing at one end of said orbiting shaft and the rotating shaft bearing rotatably supporting said rotating shaft at said one cover; and a 5 2nd balance weight is attached to said rotating shaft between said orbiting bearing at the other end of said orbiting shaft and the rotating shaft bearing rotatably supporting said rotating shaft at said the other cover.
10 Advantageous Effects
In the invention according to claim 1, orbiting bearings which support an orbiting shaft provided at the center part of an orbiting scroll are arranged on both sides of the orbiting shaft and the orbiting bearing is not located at the center part of the 15 orbiting scroll, whereby the heat of orbiting scroll is hardly transmitted to the orbiting bearing. Even if the center part of the orbiting scroll is heated to a high temperature, the orbiting bearing is not heated to a high temperature. Thus, the durability of the orbiting bearing is increased. Further, the 20 diameter of the orbiting shaft can be reduced, whereby the diameter of the orbiting scroll can be reduced. Hereby, a scroll fluid machine can be made compact.
In the invention according to claim 2, the eccentric portion of the rotating shaft is provided only at two positions of the 25 orbiting bearing. Other portions of the rotating shaft are not eccentrically formed. A centrifugal force is not generated in portions which are not eccentrically formed. Thereby, the deformation of the rotating shaft is reduced. As such, the vibration of the scroll fluid machine is also reduced. 30 In the invention according to claim 3, the housing of the orbiting bearing is also a component of a self-rotation prevention mechanism, whereby the number of components used in
3
the scroll fluid machine is reduced.
In the invention according to claim 4, the distance between a 1st and a 2nd balance weights and an orbiting bearing can be reduced, whereby a moment applied to a rotating shaft can be 5 reduced, thus the deformation of the shaft can be suppressed.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is an axial sectional view of an embodiment of a compressor according to the present invention.
10 Fig. 2 is a cross-sectional view of a self-rotation prevention mechanism taken along the plane orthogonal to the cross-sectional surface of Fig. 1.
MODE FOR THE INVENTION
15 Fig. 1 and Fig. 2 show an embodiment of compressor according to the present invention. An orbiting scroll 1 is installed inside a compressor. An orbiting scroll 1 includes a paneling 1A which has a spiral wrap IB and a spiral wrap 1C on both sides thereof. The orbiting scroll 1 is interposed between a 1st fixed
20 scroll 2 and a 2nd fixed scroll 3. The 1st fixed scroll 2 and the 2nd fixed scroll 3 are fixed to each other. The 1st fixed scroll 2 includes a paneling 2A which has a spiral wrap 2B. The 2nd fixed scroll 3 includes a paneling 3A which has a spiral wrap 3B. Compression chamber 4 is constituted of the paneling 1A of
25 the orbiting scroll 1 and the wrap IB, and the paneling 2A of the 1st fixed scroll 2 and the wrap 2B. Compression chamber 5 is constituted of the paneling 1A of the orbiting scroll 1 and the wrap 1C, and the paneling 3A of the 2nd fixed scroll 3 and the wrap 3B.
30 A hollow orbiting shaft ID is provided radially in the center part of the paneling 1A. A 1st orbiting bearing housing 11 is fixed to one end of the orbiting shaft ID in the axial
4
direction. A 1st orbiting bearing 12 is provided at the center part of the 1st orbiting bearing housing 11. A 2nd orbiting bearing housing 13 is fixed to the other end of the orbiting shaft ID in the axial direction. A 2nd orbiting bearing 14 is 5 provided at the center part of the 2nd orbiting bearing housing 13. A rotating shaft 6 passes through the hollow portion of the orbiting shaft ID. A cylindrical portion 2C is provided on the back surface of the 1st fixed scroll 2. A cover 7 is arranged on the end face of the cylindrical portion 2C. A 1st rotating shaft 10 bearing 8 is provided on the center part of the cover 7. A cylindrical portion 3C is provided on the back surface of the 2nd fixed scroll 3. A cover 9 is arranged on the end face of the cylindrical portion 3C. A 2nd rotating shaft bearing 10 is provided on the center part of the cover 9. The one end 6C of 15 the rotating shaft 6 is supported by the 1st rotating shaft bearing 8. The edge of the rotating shaft 6 passes through the cover 7 and extends outside the cover 7. A sealing member 15 is provided on the center part of the cover 7 so as to seal between the rotating shaft 6 and the cover 7 . The other end 6D of the 20 rotating shaft 6 is supported by the 2nd rotating shaft bearing 10. Eccentric portions 6A and 6B are formed at two positions of the rotating shaft 6. The intermediate portion between the eccentric portion 6A and the eccentric portion 6B of the rotating shaft 6 is formed coaxially with the rotation center axis of the 25 rotating shaft 6. The 1st orbiting bearing 12 fits the eccentric portion 6A. The 2nd orbiting bearing 14 fits the eccentric portion 6B. That is, the eccentric portions 6A and 6B are provided only on the positions corresponding to the 1st orbiting bearing 12 and the 2nd orbiting bearing 14 of the rotating shaft 30 6.
The 1st orbiting bearing housing 11 has a flange portion 11A. The flange portion 11A has orbiting-side key grooves 11B, 11B. A
5
fixed board 16 is fixed to the inner surface of the cylindrical portion 2C. An Oldham's ring 17 fits in between the flange portion 11A and the fixed board 16. The Oldham's ring 17 has Oldham's keys 17A, 17A. The Oldham's keys 17A, 17A fit the 5 orbiting-side key grooves 11B, 11B.
Fig. 2 is a partial cross-sectional view taken along the plane in the axial direction orthogonal to the cross-sectional surface of Fig. 1. As shown in Fig. 2, the Oldham's ring 17 has the Oldham's keys 17B, 17B on the surface of the opposite side 10 while having the Oldham's keys 17A, 17A. The Oldham's keys 17A, 17A and the Oldham's keys 17B, 17B cross orthogonally to each other. The fixed board 16 has fixed-side key grooves 16A, 16A at the positions facing the Oldham's keys 17B, 17B. That is, a pair of the fixed-side key grooves 16A, 16A is provided coupled to the 15 1st fixed scroll 2. The Oldham's keys 17B, 17B fit the fixed-side key grooves 16A, 16A. The Oldham's ring 17, the orbiting-side key grooves 11B, 11B, and the fixed-side key grooves 16A, 16A constitute a self-rotation prevention mechanism. Owing to the self-rotation prevention mechanism, the 1st orbiting bearing 20 housing 11 is prevented from rotating while being able to orbit. As such, the orbiting scroll 1 is also only able to orbit without rotation.
The 1st orbiting bearing housing 11 has a sealing board 11C. A sealing ring 18 is provided on the paneling 2A so as to seal 25 between the sealing board 11C and the paneling 2A.
The 2nd orbiting bearing housing 13 has a flange portion 13A, while a sealing board 19 is attached to the inner surface of the cylindrical portion 3C.
A sealing ring 20 is provided on the outer peripheral surface of 30 the sealing board 19. A sealing ring 21 is provided on the end face of the sealing board 19. The sealing ring 20 and the sealing ring 21 seal between the inner surface of the cylindrical
6
portion 3C and the end face of the flange portion 13A, and the sealing board 19.
A weight chamber 27 is formed between the cover 7 and the 1st orbiting bearing housing 11. A 1st balance weight 22 is 5 attached between the 1st rotating shaft bearing 8 of the rotating shaft 6 and the 1st orbiting bearing 12, in the weight chamber 27 A weight chamber 28 is formed between the cover 9 and the 2nd orbiting bearing housing 13. A 2nd balance weight 23 is attached between the 2nd rotating shaft bearing 10 of the rotating shaft 6 10 and the 2nd orbiting bearing 14, in the weight chamber 28.
An inlet 24 is provided on the outer peripheral portion of the fixed scroll 2. An opening 38 is provided on the paneling 1A adjacent to the orbiting shaft ID. An outlet chamber 25 is provided on the backside of the paneling 3A of the fixed scroll 3 15 An outlet 26 is provided on the outer peripheral portion of the paneling 3A. A compressor is installed on one side 37A of a base 37 .
An electric motor 29 is placed on the other side 37B of the base 37. A drive shaft 29A of the electric motor 29 and one end 20 6C of the rotating shaft 6 are coaxially arranged, and connected to each other with a coupling 30 while being prevented from rotating by a key and so forth.
An oil tank 31 is installed. Lubricant oil 32 is reserved in the oil tank 31. An oil inlet tube 33 is connected to the 25 bottom of the oil tank 31, and is connected to the entrance of a pump 34. An oil feed tube 35 is connected to the exit of the pump 34, and is communicated with the top of the weight chamber 27 and the weight chamber 28. An oil return tube 36 is connected to the bottom of the weight chamber 2 7 and the weight chamber 28, 30 and is communicated with the oil tank 31.
Next, the operation of the compressor is described. When the electric motor 29 is energized, the drive shaft 29A rotates,
7
and the rotating shaft 6 which is coupled with the drive shaft 29A rotates. When the rotating shaft 6 rotates, the orbiting shaft ID is eccentrically driven while being prevented from self-rotating by the self-rotation prevention mechanism. As a result, 5 the orbiting scroll 1 which is integrally formed with the orbiting shaft ID performs orbiting motion. Thereby gas moves from the outer periphery to the inner periphery in the compression chamber 4 and the compression chamber 5 while being reduced in volume. Gas is inleted through an inlet 24, is 10 compressed in the compression chamber 4 and the compression chamber 5. Then, the gas is discharged into the outlet chamber 25, and is discharged outside through the outlet 26. Owing to the 1st balance weight 22 and the 2nd balance weight 23, a centrifugal force of the orbiting scroll 1 is canceled. As such, 15 vibration hardly occurs.
The lubricant oil 32 is fed from the oil tank 31 through the oil inlet tube 33, pressurized by the pump 34, and is dropped into the weight chamber 27 and the weight chamber 28 through the oil feed tube 35. The lubricant oil 32 is supplied to the 1st 20 rotating shaft bearing 8, the 2nd rotating shaft bearing 10, the 1st orbiting bearing 12, the 2nd orbiting bearing 14, Oldham's keys 17A, 17A, and so forth, and returns from the bottom of the weight chamber 27 and the weight chamber 28 to the oil tank 31 through the oil return tube 36 after lubricating the curved 25 portions and slide portions of these components.
According to an example of this embodiment, the 1st orbiting bearing 12 and the 2nd orbiting bearing 14 are not located at the center part of the orbiting scroll 1. Thus, the 1st orbiting bearing 12 and the 2nd orbiting bearing 14 are difficultly 30 affected by the heat of the orbiting scroll 1 even when the orbiting scroll 1 is heated to a high temperature due to compression heat, thereby being less heated. That is, the
8
durability of the compressor is increased. Further, since no bearing exists inside the orbiting shaft ID, the distance between the outer periphery of the rotating shaft 6 and the inner periphery of the orbiting shaft ID becomes small, thus the 5 diameter of the orbiting shaft ID can be made smaller. As such, the diameters of the orbiting scroll 1, the 1st fixed scroll 2 and the 2nd fixed scroll 3 can be made smaller, whereby the compressor can be made compact.
Further, since orbiting scroll 1 is located between the 1st 10 orbiting bearing 12 and the 2nd orbiting bearing 14, a centrifugal force and gas load are equally applied to the 1st orbiting bearing 12 and the 2nd orbiting bearing 14. Thus, no tilt occurs for the orbiting scroll 1.
Further, the distance between the 1st orbiting bearing 12 15 and the 1st rotating shaft bearing 8 and the distance between the 2nd orbiting bearing 14 and the 2nd rotating shaft bearing 10 are small. Also, the distance between the 1st balance weight 22 and the 1st orbiting bearing 12 and the distance between the 2nd balance weight 23 and the 2nd orbiting bearing 14 are small. 20 Thus, the moment applied to the rotating shaft 6 is small, thereby causing little deformation to the rotating shaft 6. As such, the orbiting scroll 1 can be stably operated with a set amount of eccentricity, even if the orbiting scroll 1 is driven at a high speed. Thus, little vibration occurs in the compressor 25 In an example of this embodiment, a compressor is described.
However, the present invention can be also applied to a scroll fluid machine such as a vacuum pump, a blower, an expander and so forth.
9

Claims (3)

1. A scroll fluid machine constituted of a combination of an orbiting scroll that has a spiral wrap on both surfaces of a
5 paneling and a pair of fixed scrolls that has a spiral wrap on one surface of a paneling, wherein a hollow orbiting shaft is provided at the center part of said orbiting scroll to pass through said fixed scroll;
a rotating shaft passes through the hollow portion of said 10 orbiting shaft such that it is rotatably supported by a pair of covers provided on the outer surface side of said fixed scroll;
orbiting bearings are provided on both ends of said orbiting shaft to fit an eccentric portion provided on said rotating shaft;
15 and a self-rotation prevention mechanism of said orbiting scroll is provided on one end of said orbiting shaft.
2. The scroll fluid machine according to claim 1, wherein said eccentric portion is provided only at the position of said rotating shaft corresponding to said orbiting bearing, 20 and the intermediate portion between the eccentric portions of said rotating shaft is formed coaxially with the rotation center axis.
3. The scroll fluid machine according to claim 1 or 2, wherein said self-rotation prevention mechanism is constituted of a
25 pair of fixed-side key grooves provided coupled with said fixed scroll on one side;
a pair of orbiting-side key grooves provided so as to cross orthogonally to said fixed-side key grooves in an orbiting bearing housing which is provided on said orbiting shaft to 30 accommodate said orbiting bearing;
and an Oldham's ring having a pair of Oldham's keys fitting said fixed-side key grooves and a pair of Oldham's keys fitting o o
12
said orbiting-side key grooves.
4 . The scroll fluid machine according to any one of claims 1 to 3, wherein a 1st balance weight is attached to said rotating shaft 5 between said orbiting bearing at one end of said orbiting shaft and the rotating shaft bearing rotatably supporting said rotating shaft at said one cover;
and a 2nd balance weight is attached to said rotating shaft between said orbiting bearing at the other end of said orbiting 10 shaft and the rotating shaft bearing rotatably supporting said rotating shaft at said the other cover.
13
3. The scroll fluid machine according to claim 1 or 2, wherein said self-rotation prevention mechanism is constituted of a
25 pair of fixed-side key grooves provided coupled with said fixed scroll on one side;
a pair of orbiting-side key grooves provided so as to cross orthogonally to said fixed-side key grooves in an orbiting bearing housing which is provided on said orbiting shaft to 30 accommodate said orbiting bearing;
and an Oldham's ring having a pair of Oldham's keys fitting said fixed-side key grooves and a pair of Oldham's keys fitting
10
said orbiting-side key grooves.
4 . The scroll fluid machine according to any one of claims 1 to 3, wherein a 1st balance weight is attached to said rotating shaft 5 between said orbiting bearing at one end of said orbiting shaft and the rotating shaft bearing rotatably supporting said rotating shaft at said one cover;
and a 2nd balance weight is attached to said rotating shaft between said orbiting bearing at the other end of said orbiting 10 shaft and the rotating shaft bearing rotatably supporting said rotating shaft at said the other cover.
11
Amendments to the claims have been filed as follows:
1. A scroll fluid machine constituted of a combination of an orbiting scroll that has a spiral wrap on both surfaces of a
5 paneling and a pair of fixed scrolls that has a spiral wrap on one surface of a paneling, wherein a hollow orbiting shaft is provided at the center part of said orbiting scroll to pass through said fixed scrolls;
a rotating shaft passes through the hollow portion of said 10 orbiting shaft such that it is rotatably supported by a pair of covers provided on the outer surface side of said fixed scrolls;
orbiting bearings are provided on both ends of said orbiting shaft to fit an eccentric portion provided on said rotating shaft;
^^15 and a self-rotation prevention mechanism of said orbiting scroll is provided on one end of said orbiting shaft.
2. The scroll fluid machine according to claim 1, wherein said eccentric portion is provided only at the position of said rotating shaft corresponding to said orbiting bearings, 20 and the intermediate portion between the eccentric portion of said rotating shaft is formed coaxially with the rotation center axis.
GB201203866A 2012-03-06 2012-03-06 Scroll fluid machine Expired - Fee Related GB2500003B (en)

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GB2500003A true GB2500003A (en) 2013-09-11
GB2500003B GB2500003B (en) 2014-02-19

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105569736A (en) * 2014-10-31 2016-05-11 阿耐思特岩田株式会社 Scroll expander
CN110337543A (en) * 2017-02-17 2019-10-15 三菱重工业株式会社 Dual rotary Scrawl compressor and its assemble method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002089460A (en) * 2000-09-08 2002-03-27 Hitachi Koki Co Ltd Scroll type fluid machine
JP2012057509A (en) * 2010-09-07 2012-03-22 Ricchisutoon:Kk Scroll fluid machine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002089460A (en) * 2000-09-08 2002-03-27 Hitachi Koki Co Ltd Scroll type fluid machine
JP2012057509A (en) * 2010-09-07 2012-03-22 Ricchisutoon:Kk Scroll fluid machine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105569736A (en) * 2014-10-31 2016-05-11 阿耐思特岩田株式会社 Scroll expander
CN105569736B (en) * 2014-10-31 2019-07-16 阿耐思特岩田株式会社 Scroll expander
CN110337543A (en) * 2017-02-17 2019-10-15 三菱重工业株式会社 Dual rotary Scrawl compressor and its assemble method
CN110337543B (en) * 2017-02-17 2021-05-28 三菱重工业株式会社 Double-rotation scroll compressor

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