WO2019021711A1 - スクロール型流体機械 - Google Patents

スクロール型流体機械 Download PDF

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Publication number
WO2019021711A1
WO2019021711A1 PCT/JP2018/023914 JP2018023914W WO2019021711A1 WO 2019021711 A1 WO2019021711 A1 WO 2019021711A1 JP 2018023914 W JP2018023914 W JP 2018023914W WO 2019021711 A1 WO2019021711 A1 WO 2019021711A1
Authority
WO
WIPO (PCT)
Prior art keywords
scroll
bearing
drive shaft
main bearing
fluid machine
Prior art date
Application number
PCT/JP2018/023914
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
泰造 佐藤
今井　哲也
Original Assignee
サンデン・オートモーティブコンポーネント株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by サンデン・オートモーティブコンポーネント株式会社 filed Critical サンデン・オートモーティブコンポーネント株式会社
Priority to DE112018003777.0T priority Critical patent/DE112018003777B4/de
Publication of WO2019021711A1 publication Critical patent/WO2019021711A1/ja

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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
    • 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
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/0021—Systems for the equilibration of forces acting on the pump
    • 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

Definitions

  • the present invention relates to a scroll-type fluid machine that revolves a movable scroll relative to a fixed scroll.
  • a scroll mechanism of this type such as a scroll compressor, comprises a fixed scroll having a spiral wrap on the surface of a mirror plate and a scroll mechanism (a compression mechanism comprising a movable scroll having a spiral wrap on the mirror surface Allowing the wraps of the scrolls to face each other to form a compression chamber between the wraps, and rotating the movable scroll relative to the fixed scroll by the drive shaft of the motor to rotate the movable scroll in the compression chamber. It is configured to compress.
  • a back pressure chamber for pressing the movable scroll against the fixed scroll is formed on the back surface of the end plate of the movable scroll in opposition to the compression reaction force from the compression chamber.
  • the drive shaft is rotatably supported by a main bearing on the compression mechanism side and a sub-bearing positioned on the opposite side to the compression mechanism as viewed from the main bearing (see, for example, Patent Document 1).
  • a rolling bearing (deep groove ball bearing) or a sliding bearing (see, for example, Patent Document 2) as shown in Patent Document 1 is adopted as the bearing.
  • the slide bearing can realize significant simplification, downsizing, and noise reduction of the structure as compared with a rolling bearing.
  • this slide bearing is used as a main bearing, the shaft of the drive shaft Since it becomes impossible to regulate the movement of the direction, there has been a problem that external vibration causes contact or breakage of parts, particularly at the time of start or stop.
  • the present invention has been made to solve such conventional technical problems, and solves the problem caused by the axial movement of the drive shaft even when a slide bearing is used as the main bearing.
  • An object of the present invention is to provide a scroll type fluid machine that can
  • the scroll-type fluid machine drives a scroll mechanism including a fixed scroll and a movable scroll in which a spiral wrap is formed to face each surface of each end plate, and a movable scroll.
  • the main bearing is constituted by a slide bearing
  • the sub bearing is constituted by a rolling bearing
  • an elastic member for urging the drive shaft in the sub bearing direction is provided.
  • the drive shaft in the above invention is characterized in that it has a step portion which abuts on the main bearing side surface of the inner ring of the sub bearing.
  • the elastic member in each of the above inventions is characterized by comprising a wave washer disposed between the member holding the main bearing and the drive shaft.
  • the scroll-type fluid machine according to the invention of claim 4 is fixed to the center plate accommodating the movable scroll in each of the above-mentioned inventions, and is provided with a bearing holder constituting a member for holding the main bearing
  • the elastic member is characterized in that the elastic member is disposed between the bearing holder and the overhang.
  • a scroll mechanism comprising a fixed scroll and a movable scroll formed by facing respective spiral wraps on each surface of each end plate, a drive shaft for driving the movable scroll, and a drive shaft on the scroll mechanism side
  • a scroll type fluid including a main bearing rotatably supported and an auxiliary bearing rotatably supporting a drive shaft on the opposite side of the scroll mechanism as viewed from the main bearing, and rotating the movable scroll relative to the fixed scroll
  • the main bearing is constituted by a slide bearing
  • the auxiliary bearing is constituted by a rolling bearing
  • an elastic member for urging the drive shaft in the auxiliary bearing direction is provided. It is possible to bias in the direction to restrict the axial movement of the drive shaft.
  • the elastic member presses the stepped portion of the drive shaft against the inner ring of the auxiliary bearing.
  • the axial movement of the drive shaft can be effectively restricted.
  • the elastic member is constituted by a wave washer disposed between the member holding the main bearing and the drive shaft as in the invention of claim 3, the structure can be simplified and miniaturized. become.
  • a bearing holder fixed to the center plate for accommodating the movable scroll as in the invention of claim 4 is provided, and the bearing holder constitutes a member for holding the main bearing, and an overhang extending in the radial direction to the drive shaft
  • FIG. 1 is a cross-sectional view of a scroll-type fluid machine of one embodiment to which the present invention is applied. It is an enlarged view of the main bearing part of the scroll type fluid machine of FIG.
  • FIG. 1 is a cross-sectional view of a scroll-type fluid machine 1 of an embodiment to which the present invention is applied
  • FIG. 2 is an enlarged view of a main bearing 18 portion thereof.
  • the scroll-type fluid machine 1 according to the embodiment is a scroll compressor that is used, for example, in a refrigerant circuit of a vehicle air conditioner, and sucks, compresses and discharges a refrigerant as a working fluid of the vehicle air conditioner.
  • It is a so-called inverter-integrated scroll-type fluid machine including a motor 2, an inverter 3 for operating the electric motor 2, and a scroll mechanism 4 driven by the electric motor 2.
  • the scroll-type fluid machine 1 includes a front casing 6 that houses the electric motor 2 and the scroll mechanism 4 and the inverter 3 therein, an inverter cover 8 and a rear casing 9.
  • the front casing 6, the inverter cover 8, and the rear casing 9 are all made of metal (in the embodiment, made of aluminum), and they are integrally joined to constitute the housing 11 of the scroll-type fluid machine 1.
  • the front casing 6 is composed of a cylindrical peripheral wall 6A and a partition wall 6B.
  • the partition wall 6B is a partition that divides the inside of the front casing 6 into a main housing 12 that houses the electric motor 2 and the scroll mechanism 4 and an inverter housing 13 that houses the inverter 3.
  • a sub bearing 16 for rotatably supporting one end (front side) of the drive shaft 14 of the electric motor 2 is attached to the partition wall 6B.
  • the auxiliary bearing 16 is constituted by a rolling bearing (deep groove ball bearing) consisting of an inner ring 16A, an outer ring 16B and balls 16C, the outer ring 16B is fixed to the partition wall 6B of the front casing 6, and the drive shaft 14 is fixed to the inner ring 16A.
  • a stepped portion 14A is formed at one end of the drive shaft 14, and the stepped portion 14A is an inner ring of the sub bearing 16 with the drive shaft 14 fitted to the inner ring 16A of the sub bearing 16. It abuts on the surface of the 16A electric motor 2 side (main bearing 18 side described later).
  • reference numeral 7 denotes a center plate constituting the scroll mechanism 4 and is partially fixed to the inside of the peripheral wall portion 6A of the front casing 6. The center plate 7 is open on the side opposite to the electric motor 2 (the other end side), and after the movable scroll 22 described later is accommodated, the fixed scroll 21 described later also corresponds to the center plate 7.
  • the center plate 7 includes a cylindrical peripheral wall 7A and a frame 7B at one end thereof.
  • the movable scroll 22 of the scroll mechanism 4 is accommodated in a space defined by the peripheral wall 7A and the frame 7B.
  • the frame portion 7 B forms a partition that divides the inside of the front casing 6 and the center plate 7.
  • a through hole 17 is formed in the frame portion 7B for inserting the other end of the drive shaft 14 of the electric motor 2.
  • a main bearing 18 is provided which rotatably supports the other end of the drive shaft 14 on the side.
  • the main bearing 18 is constituted by a slide bearing.
  • the bearing holder 15 (member for holding the main bearing 18) is fixed to the inside of the peripheral wall portion 7A of the center plate 7 over the entire inner circumference, and the main bearing 18 is a part of the bearing holder 15. It is attached and held on the drive shaft 14 side.
  • the auxiliary bearing 16 is located on the opposite side of the scroll mechanism 4 as viewed from the main bearing 18 to support one end of the drive shaft 14.
  • reference numeral 19 denotes a sealing material which seals the outer peripheral surface of the drive shaft 14 and the inside of the center plate 7 at the through hole 17 portion.
  • the electric motor 2 comprises a stator 22 wound with a coil and fixed to the inside of the peripheral wall 6A of the front casing 6, and a rotor 23 rotating on the inside. Then, for example, a direct current from a battery (not shown) of the vehicle is converted into a three-phase alternating current by the inverter 3 and power is supplied to the coil of the stator 22 of the electric motor 2 so that the rotor 23 is rotationally driven. It is configured.
  • the drive shaft 14 is fixed to the rotor 23. Further, a suction port 21 is formed in the front casing 6, and the refrigerant sucked from the suction port 21 passes through the electric motor 2 in the front casing 6 and a gap between the center plate 7 and the front casing 6.
  • the scroll mechanism 4 includes the fixed scroll 21 and the movable scroll 22 described above.
  • the fixed scroll 21 integrally includes a disk-like end plate 23 and a spiral wrap 24 having an involute shape standing on the surface (one surface) of the end plate 23 or a curve similar thereto.
  • the surface of the mirror plate 23 on which the wrap 24 is erected is fixed to the center plate 7 with the frame portion 7B side.
  • a discharge hole 26 is formed at the center of the end plate 23 of the fixed scroll 21, and the discharge hole 26 is in communication with the discharge space 27 in the rear casing 9.
  • reference numeral 28 denotes a discharge valve provided at an opening on the back surface (the other surface) side of the end plate 23 of the discharge hole 26.
  • the movable scroll 22 is a scroll that revolves around the fixed scroll 21 and has a disk-like end plate 31 and an involute shape erected on the surface (one surface) of the end plate 31 or an approximation thereof.
  • a spiral wrap 32 composed of a curved line and a boss 33 formed in the center of the back surface (the other surface) of the mirror plate 31 are integrally provided.
  • the movable scroll 22 is disposed so that the wrap 32 faces the wrap 24 of the fixed scroll 21 with the protruding direction of the wrap 32 on the fixed scroll 21 side, and faces each other and engages with each other.
  • the wrap 32 of the movable scroll 22 faces the wrap 24 of the fixed scroll 21, the tip of the wrap 32 contacts the surface of the end plate 23, and the end of the wrap 24 meshes so as to contact the surface of the end plate 31.
  • An eccentric portion 36 eccentrically provided from the axial center at the other end of the drive shaft 14 is fitted to the boss 33 of the scroll 22. Then, when the drive shaft 14 is rotated together with the rotor 23 of the electric motor 2, the movable scroll 22 revolves around the fixed scroll 21 without rotating.
  • reference numeral 38 denotes an annular thrust plate.
  • the thrust plate 38 defines a back pressure chamber 39 formed between the rear surface of the end plate 31 of the movable scroll 22 and the center plate 7 and a suction portion 37 as a suction pressure area outside the scroll mechanism 4.
  • a seal 41 is attached to the back of the end plate 31 of the movable scroll 22 and abuts against the thrust plate 38.
  • the seal 41 and the thrust plate 38 divide the back pressure chamber 39 and the suction portion 37 from each other.
  • Reference numeral 42 denotes a sealing member attached to the center plate 7 to abut the outer peripheral portion of the thrust plate 38 and seal between the center plate 7 and the thrust plate 38, and 45 denotes the movable scroll 22 side as viewed from the main bearing 18. It is a counterweight attached to the drive shaft 14.
  • Reference numeral 48 denotes an oil separator provided in the discharge space 27 of the rear casing 9.
  • reference numeral 43 denotes a back pressure passage formed from the rear casing 9 to the center plate 7, and an orifice 44 is mounted in the back pressure passage 43.
  • the back pressure passage 43 is a path connecting the oil separator 48 provided in the discharge space 27 in the rear casing 9 (the discharge side of the scroll mechanism 4) and the back pressure chamber 39, whereby the back pressure chamber 39 is formed.
  • the discharge pressure adjusted by the orifice 44 is supplied together with the oil separated by the oil separator 48.
  • the pressure (back pressure) in the back pressure chamber 39 generates a back pressure load that presses the movable scroll 22 against the fixed scroll 21.
  • the movable scroll 22 is pressed against the fixed scroll 21 against the compression reaction force from the pressure chamber 34 of the compression mechanism 4 by this back pressure load, and the contact between the wraps 24 and 32 and the end plates 31 and 23 is maintained.
  • the refrigerant can be compressed.
  • a pressure relief passage 46 is formed in the center plate 7, and a pressure control valve (PCV) 47 is provided in the pressure relief passage 46.
  • the pressure relief passage 46 communicates a second back pressure chamber 39 B (described later) of the back pressure chamber 39 with the inside of the front casing 6 (intake pressure region), but the pressure control valve 47 is a second pressure chamber.
  • the drive shaft 14 at a portion entering the center plate 7 from the through hole 17 is provided with an overhanging portion 51 positioned radially outward on the seal material 19 side (sub bearing 16 side) of the bearing holder 15 there is.
  • the overhanging portion 51 is formed of a circular plate material attached to the drive shaft 14 and is provided at a distance from the bearing holder 15, and an elastic member is provided within the space between the overhanging portion 51 and the bearing holder 15.
  • the wave washer 52 is disposed as.
  • the wave washer 52 normally biases the projecting portion 51 away from the bearing holder 15.
  • the drive shaft 14 is always urged toward the secondary bearing 16 by the wave washer 52, and the step 14A is pressed against the surface of the inner ring 16A of the secondary bearing 16 on the primary bearing 18 side.
  • the main bearing 18 can not regulate the movement of the drive shaft 14 in the axial direction.
  • a first back pressure chamber 39A located on the opposite side of the movable scroll 22 by the bearing holder 15 and the main bearing 18, and a second back pressure chamber 39B located on the movable scroll 22 side.
  • the first back pressure chamber 39A and the second back pressure chamber 39B communicate with each other only by the radial clearance between the main bearing 18 and the drive shaft 14.
  • the back pressure passage 43 is in communication with the first back pressure chamber 39A. From the back pressure passage 43, as described above, the refrigerant gas of the discharge pressure whose pressure is adjusted by the orifice 44 is supplied to the first back pressure chamber 39A as shown by the arrow in FIG. 2 together with the oil separated by the oil separator 48. Ru.
  • the refrigerant gas and oil of the discharge pressure supplied into the first back pressure chamber 39A pass through the radial clearance between the main bearing 18 and the drive shaft 14 as indicated by the arrows and are transferred to the second back pressure chamber 39B.
  • the movable scroll 22 is pushed in the direction of the fixed scroll 21 but the radial clearance between the main bearing 18 and the drive shaft 14 is narrow, and the pressure in the second back pressure chamber 39B is It becomes lower than the first back pressure chamber 39A, and a differential pressure is generated between the first back pressure chamber 39A and the second back pressure chamber 39B. Since the oil flowing from the back pressure passage 43 into the first back pressure chamber 39A flows between the main bearing 18 and the drive shaft 14 by this differential pressure, these sliding portions are forced to be lubricated.
  • the pressure on the first back pressure chamber 39A side which is higher than the second back pressure chamber 39B, is directed to the movable scroll 22 side (rear casing 9 side) with respect to the drive shaft 14.
  • the load on the sub bearing 16 is reduced, and the life of the sub bearing 16 is extended.
  • the main bearing 18 is configured as a slide bearing
  • the sub bearing 16 is configured as a rolling bearing
  • the wave washer 52 is used as an elastic member that biases the drive shaft 14 in the direction of the sub bearing 16. Since the wave washer 52 is provided, the drive shaft 14 can be biased in the direction of the auxiliary bearing 16 to restrict the axial movement of the drive shaft 14.
  • the step portion 14A of the drive shaft 14 is in contact with the surface on the main bearing 18 side of the inner ring 16A of the sub bearing 16. Therefore, the step portion 14A of the drive shaft 14 is Thus, the axial movement of the drive shaft 14 can be restricted more effectively.
  • the elastic member is composed of the wave washer 52 disposed between the bearing holder 15 as the member for holding the main bearing 18 and the drive shaft 14, simplification and downsizing of the structure can be achieved.
  • a bearing holder 15 fixed to the center plate 7 for accommodating the movable scroll 22 is provided, and the bearing holder 15 constitutes a member for holding the main bearing 18 and radially protrudes to the drive shaft 14
  • the drive shaft 14 can be effectively urged in the direction of the sub bearing 16 Can be simplified and miniaturized.
  • the elastic member for urging the drive shaft 14 in the direction of the auxiliary bearing 16 is constituted by the wave washer 52, but the invention is not limited thereto and the scope of the present invention is not deviated from it. Needless to say, various elastic members can be used.
  • the present invention is applied to the scroll fluid machine used in the refrigerant circuit of the air conditioning apparatus for a vehicle, but the present invention is not limited thereto, and the present invention is applied to the scroll fluid machine used in the refrigerant circuit of various refrigeration systems. Is valid. Furthermore, although the present invention is applied to a so-called inverter-integrated scroll-type fluid machine in the embodiment, the present invention is not limited thereto, and can be applied to a normal scroll-type fluid machine not integrally provided with an inverter. Furthermore, although the present invention has been described using a scroll compressor in the embodiments, the present invention is not limited to this, and the present invention can be applied to a scroll-type expansion compressor and the like integrally provided with an expander and a compressor.
PCT/JP2018/023914 2017-07-24 2018-06-18 スクロール型流体機械 WO2019021711A1 (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE112018003777.0T DE112018003777B4 (de) 2017-07-24 2018-06-18 Strömungsmaschine des spiraltyps

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017142677A JP6961413B2 (ja) 2017-07-24 2017-07-24 スクロール型流体機械
JP2017-142677 2017-07-24

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Publication Number Publication Date
WO2019021711A1 true WO2019021711A1 (ja) 2019-01-31

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PCT/JP2018/023914 WO2019021711A1 (ja) 2017-07-24 2018-06-18 スクロール型流体機械

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JP (1) JP6961413B2 (de)
DE (1) DE112018003777B4 (de)
WO (1) WO2019021711A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2024030314A (ja) * 2022-08-24 2024-03-07 サンデン株式会社 スクロール圧縮機

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007285143A (ja) * 2006-04-13 2007-11-01 Matsushita Electric Ind Co Ltd スクロール式流体機械
JP2013155643A (ja) * 2012-01-27 2013-08-15 Toyota Industries Corp 電動圧縮機
JP2015113722A (ja) * 2013-12-09 2015-06-22 株式会社豊田自動織機 スクロール型圧縮機

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU632332B2 (en) 1989-06-20 1992-12-24 Sanden Corporation Scroll type fluid displacement apparatus
JP2538079B2 (ja) 1989-11-02 1996-09-25 松下電器産業株式会社 スクロ―ル圧縮機
JP4983714B2 (ja) 2008-04-23 2012-07-25 株式会社豊田自動織機 電動圧縮機
JP5998818B2 (ja) 2011-10-17 2016-09-28 株式会社豊田自動織機 電動圧縮機
JP5578159B2 (ja) 2011-11-18 2014-08-27 株式会社豊田自動織機 車両用圧縮機

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007285143A (ja) * 2006-04-13 2007-11-01 Matsushita Electric Ind Co Ltd スクロール式流体機械
JP2013155643A (ja) * 2012-01-27 2013-08-15 Toyota Industries Corp 電動圧縮機
JP2015113722A (ja) * 2013-12-09 2015-06-22 株式会社豊田自動織機 スクロール型圧縮機

Also Published As

Publication number Publication date
JP2019023440A (ja) 2019-02-14
DE112018003777T5 (de) 2020-04-16
JP6961413B2 (ja) 2021-11-05
DE112018003777B4 (de) 2024-03-21

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