US20140134033A1 - Scroll compressor - Google Patents

Scroll compressor Download PDF

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Publication number
US20140134033A1
US20140134033A1 US14/076,693 US201314076693A US2014134033A1 US 20140134033 A1 US20140134033 A1 US 20140134033A1 US 201314076693 A US201314076693 A US 201314076693A US 2014134033 A1 US2014134033 A1 US 2014134033A1
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United States
Prior art keywords
movable
scroll
movable member
void
shaft support
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
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US14/076,693
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English (en)
Inventor
Kosaku TOZAWA
Ken Suitou
Kazuo Murakami
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
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Toyota Industries Corp
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Publication date
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Assigned to KABUSHIKI KAISHA TOYOTA JIDOSHOKKI reassignment KABUSHIKI KAISHA TOYOTA JIDOSHOKKI ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MURAKAMI, KAZUO, TOZAWA, KOSAKU, SUITOU, KEN
Publication of US20140134033A1 publication Critical patent/US20140134033A1/en
Abandoned legal-status Critical Current

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    • 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
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • 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
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/18—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by varying the volume of the working chamber
    • F04C28/22—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members
    • 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
    • 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
    • F04C18/0215—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
    • 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
    • F04C18/0246—Details concerning the involute wraps or their base, e.g. geometry
    • F04C18/0253—Details concerning the base
    • F04C18/0261—Details of the ports, e.g. location, number, geometry
    • 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
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/08—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by varying the rotational speed
    • 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
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/13—Noise
    • 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
    • F04C27/00—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
    • F04C27/001—Radial sealings for working fluid

Definitions

  • the present invention relates to a scroll compressor.
  • a scroll compressor includes a fixed scroll, which is fixed to a housing, and a movable scroll, which orbits with respect to the fixed scroll.
  • the fixed scroll includes a fixed base plate and a fixed spiral wall projecting from the fixed base plate.
  • the movable scroll includes a movable base plate and a movable spiral wall projecting from the movable base plate.
  • the fixed spiral wall and the movable spiral wall are engaged with each other to define a compression chamber.
  • the orbital movement of the movable scroll decreases the volume of the compression chamber and compresses refrigerant.
  • Japanese Laid-Open Patent Publication No. 2010-14108 describes an example of such a scroll compressor.
  • one aspect of the present invention is a scroll compressor that includes a rotation shaft, a fixed scroll including a fixed spiral wall, and a movable scroll including a movable spiral wall engaged with the fixed spiral wall.
  • the movable scroll orbits when the rotation shaft is rotated.
  • a compression chamber is defined between the fixed spiral wall and the movable spiral wall.
  • the compression chamber has a volume that is decreased when the movable scroll orbits, and refrigerant is compressed in the compression chamber when the volume is decreased.
  • a shaft support supports the rotation shaft.
  • the shaft support and the fixed scroll are arranged at opposite sides of the movable scroll.
  • a housing accommodates the rotation shaft, the fixed scroll, the movable scroll, and the shaft support.
  • a movable member is arranged in the shaft support.
  • a rotation restriction mechanism is configured to restrict rotation of the movable scroll.
  • the rotation restriction mechanism includes a plurality of pins, a plurality of recesses into which the respective pins are loosely fitted, and the movable member.
  • the movable member includes one of the plurality of pins and the plurality of recesses.
  • a switching mechanism is configured to switch the movable member between a state in which movement of the movable member in a radial direction of the rotation shaft is restricted and a state in which the restriction is canceled and the movable member can move freely, which changes a movable range of the movable member in the radial direction of the rotation shaft so that an orbital radius of the movable scroll is changed.
  • FIG. 1 is a cross-sectional view showing a scroll compressor of a first embodiment
  • FIG. 2 is an enlarged cross-sectional view showing a rotation restriction mechanism of the scroll compressor of FIG. 1 ;
  • FIG. 3 is a cross-sectional view showing the scroll compressor of FIG. 1 ;
  • FIG. 4 is an enlarged cross-sectional view showing a rotation restriction mechanism of the first embodiment
  • FIG. 5 is an enlarged cross-sectional view showing the rotation restriction mechanism of the second embodiment.
  • FIG. 6 is an enlarged cross-sectional view showing the rotation restriction mechanism of a second embodiment.
  • the compressor is installed in a vehicle and used with a vehicle air-conditioning device.
  • the compressor 10 includes a housing 11 made of metal (aluminum in the present embodiment).
  • the housing 11 includes a cylindrical motor housing member 12 and a cylindrical discharge housing member 13 .
  • the motor housing member 12 includes a closed end and an open end 121 h (left end as viewed in FIG. 1 ).
  • the discharge housing member 13 which has a closed end, is connected to the open end 121 h of the motor housing member 12 .
  • the motor housing member 12 accommodates a compression unit P, which compresses refrigerant, and an electric motor M, which drives the compression unit P.
  • the motor housing member 12 includes an end wall 12 a and a cylindrical shaft support portion 121 a projecting from the central section of the end wall 12 a.
  • a shaft support 21 is fixed in the motor housing member 12 near the open end 121 h.
  • An insertion hole 21 a extends through a central section of the shaft support 21 .
  • the motor housing member 12 also accommodates a rotation shaft 20 .
  • the rotation shaft 20 includes two ends. One end, which faces toward the open end 121 h of the motor housing member 12 , is located in the insertion hole 21 a of the shaft support 21 and supported by a bearing B 1 to be rotatable relative to the shaft support 21 .
  • the other end of the rotation shaft 20 faces toward the end wall 12 a of the motor housing member 12 and is supported by a bearing B 2 to be rotatable relative to the shaft support portion 121 a.
  • the bearings B 1 and B 2 are plain bearings.
  • the motor housing member 12 includes a motor chamber 121 extending between the shaft support 21 and the end wall 12 a.
  • the motor chamber 121 accommodates the electric motor M that includes a rotor 16 , which rotates integrally with the rotation shaft 20 , and a stator 17 , which surrounds the rotor 16 and is fixed to the inner surface of the motor housing member 12 .
  • the rotor 16 includes a rotor core 16 a, which is fixed to the rotation shaft 20 and rotated integrally with the rotation shaft 20 , and a plurality of permanent magnets 16 b, which are embedded in the rotor core 16 a.
  • the stator 17 includes a stator core 17 a, which is annular and fixed to the inner surface of the motor housing member 12 , and coils 17 b, which are wound around the teeth (not shown) of the stator core 17 a.
  • Leads R for U, V, and W phases extend from the ends of the coils 17 b that face toward the shaft support 21 .
  • a fixed scroll 22 is arranged between the shaft support 21 and the open end 121 h of the motor housing member 12 .
  • the fixed scroll 22 includes a circular base plate 22 a, a cylindrically-formed peripheral wall 22 b projecting from the periphery of the base plate 22 a, and a fixed spiral wall 22 c projecting from the base plate 22 a at the inner side of the peripheral wall 22 b.
  • An eccentric shaft 20 a projects from the end face of the rotation shaft 20 that faces toward the open end 121 h.
  • the eccentric shaft 20 a is eccentric to the rotation axis L of the rotation shaft 20 .
  • the eccentric shaft 20 a supports a bushing 20 b.
  • a movable scroll 23 is supported by the bushing 20 b to be rotatable relative to the bushing 20 b.
  • a bearing B 3 is arranged between the movable scroll 23 and the bushing 20 b.
  • the movable scroll 23 includes a circular base plate 23 a and a movable spiral wall 23 b projecting from the base plate 23 a toward the base plate 22 a of the fixed scroll 22 .
  • the fixed spiral wall 22 c of the fixed scroll 22 and the movable spiral wall 23 b of the movable scroll 23 are engaged with each other.
  • the fixed spiral wall 22 c has a distal surface in contact with the base plate 23 a of the movable scroll 23 .
  • the movable spiral wall 23 b has a distal surface in contact with the base plate 22 a of the fixed scroll 22 .
  • the base plate 22 a and the fixed spiral wall 22 c of the fixed scroll 22 and the base plate 23 a and the movable spiral wall 23 b of the movable scroll 23 define a compression chamber 25 .
  • the end surface of the shaft support 21 that faces the movable scroll 23 includes an accommodating recess 21 h.
  • the accommodating recess 21 h accommodates an annular movable member 28 surrounding the bushing 20 b.
  • a clearance C 1 is formed between the movable member 28 and the shaft support 21 in the radial direction of the rotation shaft 20 .
  • the movable member 28 is movable in the radial direction of the rotation shaft 20 in the range of a distance corresponding to the clearance C 1 .
  • the terms “axial direction”, “radial direction”, and “circumferential direction” refer to the axial direction, the radial direction, and the circumferential direction of the rotation shaft 20 , respectively.
  • a rotation restriction mechanism 27 is arranged between the base plate 23 a of the movable scroll 23 and the shaft support 21 .
  • the rotation restriction mechanism 27 includes a plurality of circular holes 27 a, which are recesses arranged in the outer circumferential portion of the end surface of the base plate 23 a of the movable scroll 23 , and a plurality of pins 27 b (only one shown in FIG. 1 ), which project from the outer circumferential portion of the shaft support 21 and are loosely fitted into the circular holes 27 a.
  • the pins 27 b are integrated with the movable member 28 .
  • the shaft support 21 includes a plurality of cylindrical valve chambers 21 b extending in the axial direction.
  • the valve chambers 21 b are arranged in intervals in the circumferential direction.
  • Each valve chamber 21 b has one end facing toward the movable scroll 23 that opens in the accommodating recess 21 h and another end facing away from the movable scroll 23 that is closed by a cover 21 f, which has the form of a circular plate.
  • the cover 21 f is coupled to the end surface of the shaft support 21 that faces toward the end wall 12 a of the motor housing member 12 .
  • Each valve chamber 21 b accommodates a cylindrical valve body 21 v.
  • Each valve body 21 v has a semispherical distal end that faces toward the movable scroll 23 .
  • An annular seal 21 s is arranged in the outer surface of each valve body 21 v. The seal 21 s seals the gap between the valve body 21 v and the valve chamber 21 b and divides the valve chamber 21 b into a primary void K 1 and a secondary void K 2 .
  • the primary void K 1 is located between the movable scroll 23 and the secondary void K 2 .
  • the shaft support 21 incorporates an electromagnetic switching valve 70 .
  • the shaft support 21 includes a branch passage 71 extending from the switching valve 70 to the valve chambers 21 b.
  • the branch passage 71 includes a main passage 71 a, which is in communication with the switching valve 70 , and an annular passage 71 b, which extends in the circumferential direction and communicates the main passage 71 a and the secondary voids K 2 of the valve chambers 21 b.
  • the end surface of the movable member 28 that faces away from the movable scroll 23 includes circular fitting recesses 28 k at positions corresponding to the valve chambers 21 b.
  • the surface of each fitting recess 28 k is tapered so that the diameter of the fitting recess 28 k increases from the side that faces toward the movable scroll 23 to the end surface that faces away from the movable scroll 23 .
  • the movable member 28 also includes communication passages 28 r that extend in the axial direction and are in communication with the corresponding fitting recesses 28 k.
  • An annular, flat seat member 24 is arranged between the movable scroll 23 and the movable member 28 .
  • the seat member 24 includes a peripheral portion held between the fixed scroll 22 and the shaft support 21 .
  • the seat member 24 is fixed positioned relative to the motor housing member 12 .
  • the seat member 24 includes communication holes 24 g that communicate the corresponding communication passages 28 r and a gap between the seat member 24 and the movable scroll 23 .
  • the movable scroll 23 which is coupled to the rotation shaft 20 by the eccentric shaft 20 a, orbits about the axis of the fixed scroll 22 (the rotation axis L of the rotation shaft 20 ) without rotating.
  • the rotation restriction mechanism 27 prevents rotation of the movable scroll 23 while permitting the orbital motion.
  • the orbital motion of the movable scroll 23 reduces the volume of the compression chamber 25 .
  • the fixed scroll 22 and the movable scroll 23 form a compression unit P that draws in and discharges refrigerant.
  • the peripheral wall 22 b of the fixed scroll 22 and the outermost portion in the movable spiral wall 23 b of the movable scroll 23 define a suction chamber 31 that is in communication with the compression chamber 25 .
  • the peripheral wall 22 b of the fixed scroll 22 has an outer surface including a recess 221 b.
  • the area surrounded by the recess 221 b and the inner surface of the motor housing member 12 forms a suction passage 32 that is connected to the suction chamber 31 through a through hole 221 h in the peripheral wall 22 b of the fixed scroll 22 .
  • a through hole 211 which extends through the peripheral portions of the shaft support 21 and the cover 21 f, and a through hole 24 h, which extends through the peripheral portion of the seat member 24 , connect the suction passage 32 to the motor chamber 121 .
  • the motor housing member 12 includes a suction port 122 connected to an external refrigerant circuit 19 .
  • Refrigerant gas
  • the refrigerant in the motor chamber 121 is then sent to the compression chamber 25 through the through hole 211 , the through hole 24 h, the suction passage 32 , the through hole 221 h, and the suction chamber 31 .
  • the motor chamber 121 , the through hole 211 , the through hole 24 h, the suction passage 32 , the through hole 221 h, and the suction chamber 31 form a suction pressure region.
  • the refrigerant in the compression chamber 25 is compressed by the orbiting motion (discharging motion) of the movable scroll 23 , forced through a discharge valve 22 v of a discharge port 22 e, and discharged into a discharge chamber 131 of the discharge housing member 13 .
  • a chamber-forming wall 41 is formed integrally with the discharge housing member 13 .
  • An oil-separating chamber 42 is formed between the discharge housing member 13 and the chamber-forming wall 41 .
  • the oil-separating chamber 42 is in communication with the discharge chamber 131 through a discharge port 43 formed in the discharge housing member 13 .
  • the refrigerant in the discharge chamber 131 is sent to the oil-separating chamber 42 through the discharge port 43 .
  • the oil-separating chamber 42 accommodates an oil-separating cylinder 44 .
  • the oil-separating cylinder 44 includes a large diameter portion 441 , which is fitted in the oil-separating chamber 42 , and a small diameter portion 442 , which has a smaller diameter than the oil-separating chamber 42 and is located under the large diameter portion 441 .
  • Refrigerant flows into the oil-separating chamber 42 through the discharge port 43 , swirls around the small diameter portion 442 , and then flows into the oil-separating cylinder 44 from a lower opening in the small diameter portion 442 .
  • the refrigerant further flows from the oil-separating cylinder 44 to the external refrigerant circuit 19 and then returns to the motor chamber 121 .
  • Lubricating oil is separated from the refrigerant when the refrigerant swirls around the small diameter portion 442 .
  • the separated lubricating oil falls into the lower portion of the oil-separating chamber 42 . Accordingly, the discharge port 22 e, the discharge chamber 131 , the discharge port 43 , and the oil-separating chamber 42 form a discharge pressure region.
  • An inverter cover 51 made of metal (aluminum in the present embodiment) is fixed to the end wall 12 a of the motor housing member 12 .
  • the inverter cover 51 and the end wall 12 a of the motor housing member 12 define a chamber that accommodates a motor driving circuit 52 fixed to the outer surface of the end wall 12 a.
  • the compression unit P, the electric motor M, and the motor driving circuit 52 are arranged in this order in the axial direction.
  • the end wall 12 a of the motor housing member 12 includes a through hole 12 b that receives a sealing terminal 53 .
  • the sealing terminal 53 includes three sets of a metal terminal 54 and a glass insulator 55 (only one set shown in FIG. 1 ).
  • the metal terminals 54 extend through the motor housing member 12 to electrically connect the electric motor M to the motor driving circuit 52 .
  • Each glass insulator 55 fixes the corresponding metal terminal 54 to the end wall 12 a and insulates the metal terminal 54 from the end wall 12 a.
  • Each metal terminal 54 has a first end connected to the motor driving circuit 52 by a cable (not shown) and a second end extending into the motor housing member 12 .
  • An insulative resin cluster block 56 is fixed to the outer surface of the stator core 17 a.
  • the cluster block 56 accommodates three connection terminals 56 a (only one shown in the FIG. 1 ).
  • the connection terminals 56 a electrically connect the leads R to the metal terminals 54 .
  • the motor driving circuit 52 supplies power to the coils 17 b through the metal terminals 54 , the connection terminals 56 a, and the leads R. This integrally rotates the rotor 16 and the rotation shaft 20 .
  • an annular seal 61 which is in contact with the surface of the rotation shaft 20 , divides the insertion hole 21 a of the shaft support 21 into a back pressure chamber 62 and an accommodating chamber 63 .
  • the back pressure chamber 62 is located between the seal 61 and the movable scroll 23 .
  • the accommodating chamber 63 accommodates the bearing B 1 .
  • a snap ring 64 is fitted to a section of the insertion hole 21 a of the shaft support 21 that is located in the back pressure chamber 62 . The snap ring 64 restricts movement of the seal 61 into the back pressure chamber 62 .
  • the movable scroll 23 and the seat member 24 include a first oil passage 65 extending through the movable spiral wall 23 b and the base plate 23 a near the center of the movable scroll 23 .
  • the first oil passage 65 has an end that opens to the compression chamber 25 and another end that opens to the back pressure chamber 62 .
  • Some of the refrigerant compressed in the compression chamber 25 is supplied to the back pressure chamber 62 through the first oil passage 65 .
  • the refrigerant supplied to the back pressure chamber 62 flows through the inner side of the seat member 24 into the circular holes 27 a.
  • the pressure of the refrigerant supplied into the back pressure chamber 62 and the circular holes 27 a presses the movable scroll 23 toward the fixed scroll 22 .
  • the circular holes 27 a and the back pressure chamber 62 form a back pressure region located between the movable scroll 23 and the movable member 28 in the motor housing member 12 .
  • the back pressure region applies force to the movable scroll 23 , and the force presses the movable scroll 23 against the fixed scroll 22 .
  • the refrigerant When refrigerant enters the gap between the seat member 24 and the movable scroll 23 , the refrigerant flows to the primary voids K 1 of the valve chambers 21 b through the corresponding communication holes 24 g and the communication passages 28 r.
  • the primary voids K 1 function as part of the back pressure region due to the pressure of the refrigerant flowing into the primary voids K 1 .
  • the switching valve 70 is in communication with the oil-separating chamber 42 through the second oil passage 68 , which extends through the shaft support 21 , the seat member 24 , the fixed scroll 22 , and the discharge housing member 13 . Further, the switching valve 70 is in communication with the motor chamber 121 through a communication passage 69 formed in the shaft support 21 and the cover 21 f. The switching valve 70 operates so that the secondary voids K 2 of the valve chambers 21 b are in communication with the second oil passage 68 through the branch passage 71 when the compressor 10 operates at a high rotation speed and so that the secondary voids K 2 are in communication with the communication passage 69 through the branch passage 71 when the compressor 10 operates at a low rotation speed.
  • the switching valve 70 switches between a state in which the secondary voids K 2 are in communication with a suction pressure region and a state in which the secondary voids K 2 are in communication with a discharge pressure region.
  • the suction pressure region is a low pressure region, the pressure of which is lower than that of the primary voids K 1 .
  • the primary voids K 1 are part of the back pressure region.
  • the discharge pressure region is a high pressure region, the pressure of which is higher than that of the primary voids K 1 .
  • the switching valve 70 brings the secondary voids K 2 of the valve chambers 21 b into communication with the second oil passage 68 through the branch passage 71 .
  • This allows the lubricating oil flowing in the second oil passage 68 from the oil-separating chamber 42 to be sent into the secondary voids K 2 of the valve chambers 21 b through the switching valve 70 and the branch passage 71 . Consequently, the secondary voids K 2 become part of the discharge pressure region.
  • the difference between the pressure in the primary voids K 1 and the pressure in the secondary voids K 2 moves the valve bodies 21 v toward the movable scroll 23 .
  • the distal end of each valve body 21 v that faces toward the movable scroll 23 is guided by the surface of the corresponding fitting recess 28 k into the fitting recess 28 k. Accordingly, the movable member 28 is pressed by the valve bodies 21 v toward the movable scroll 23 and received by the seat member 24 .
  • the movable member 28 is held between the valve bodies 21 v and the seat member 24 . This restricts movement of the movable member in the radial direction.
  • the engagement between the valve bodies 21 v and the respective fitting recesses 28 k also restricts the radial movement of the movable member 28 and changes the movable range of the movable member 28 in the radial direction.
  • the orbital radius of the movable scroll 23 is decreased compared to when the restriction of the movable member 28 is canceled and the movable member 28 can move freely.
  • the movable spiral wall 23 b does not contact the fixed spiral wall 22 c when the compressor 10 operates at a high rotation speed. This reduces noise that would be caused by contact between the fixed spiral wall 22 c and the movable spiral wall 23 b during high speed rotation.
  • the switching valve 70 brings the secondary voids K 2 of the valve chambers 21 b into communication with the communication passage 69 through the branch passage 71 .
  • This allows the refrigerant in the valve chambers 21 b to flow into the motor chamber 121 through the branch passage 71 , the switching valve 70 , and the communication passage 69 . Consequently, the secondary voids K 2 become part of the suction pressure region.
  • the difference in the pressure in the primary voids K 1 and the pressure in the secondary voids K 2 moves the valve bodies 21 v away from the movable scroll 23 .
  • the movable range of the movable member 28 in the radial direction is changed.
  • the orbital radius of the movable scroll 23 is increased compared to when the radial movement of the movable member 28 is restricted.
  • the movable spiral wall 23 b is in contact with the fixed spiral wall 22 c when the compressor 10 operates at low rotation speed.
  • valve chamber 21 b, the valve body 21 v, the primary void K 1 , the secondary void K 2 , the branch passage 71 , and the switching valve 70 form a switching mechanism.
  • the orbital radius of the movable scroll 23 is increased or decreased when the bushing 20 b slides or swings to move in the radial direction relative to the eccentric shaft 20 a and thereby permit radial movement of the movable scroll 23 .
  • the movable member 28 is arranged in the shaft support 21 .
  • the pins 27 b, the circular holes 27 a, and the movable member 28 form the rotation restriction mechanism 27 .
  • the movable member 28 is switched between a state in which the radial movement of the movable member 28 is restricted and a state in which the restriction is canceled and the movable member 28 can move freely. This allows the movable range of the movable member 28 and the orbital radius of the movable scroll 23 to be changed.
  • the radial movement of the movable member 28 is restricted to reduce the movable range of the movable member 28 in the radial direction.
  • the orbital radius of the movable scroll 23 is decreased so that the movable spiral wall 23 b does not contact the fixed spiral wall 22 c. This reduces noise that would be caused by contact between the fixed spiral wall 22 c and the movable spiral wall 23 b during high speed rotation.
  • the restriction of the movable member 28 is canceled so that the movable member can move freely. This increases the movable range of the movable member 28 in the radial direction and allows the orbital radius of the movable scroll 23 to be increased.
  • the movable spiral wall 23 b contacts the fixed spiral wall 22 c. This suppresses leakage of refrigerant from the compression chamber 25 during low speed rotation.
  • the shaft support 21 includes the valve chambers 21 b, each accommodating the corresponding valve body 21 v that presses the movable member 28 toward the movable scroll 23 .
  • the radial movement of the movable member 28 can be restricted by moving the valve bodies 21 v toward the movable scroll 23 so that the valve bodies 21 v press the movable member 28 toward the movable scroll 23 .
  • the shaft support 21 includes the switching valve 70 , which switches between a state in which the secondary voids K 2 are in communication with the suction pressure region having a lower pressure than the primary voids K 1 , which function as the back pressure region, and a state in which the secondary voids K 2 are in communication with the discharge pressure region having a higher pressure than the primary voids K 1 .
  • the switching valve 70 brings the secondary voids K 2 into communication with the discharge pressure region, the difference between the pressure in the primary voids K 1 and the pressure in the secondary voids K 2 moves the valve bodies 21 v toward the movable scroll 23 .
  • valve bodies 21 v press the movable member 28 toward the movable scroll 23 and easily restrict the radial movement of the movable member 28 .
  • the switching valve 70 brings the secondary voids K 2 into communication with the suction pressure region, the difference between the pressure in the primary voids K 1 and the pressure in the secondary voids K 2 moves the valve bodies 21 v away from the movable scroll 23 .
  • the valve bodies 21 v no longer press the movable member 28 against the movable scroll 23 , and the restriction of the radial movement of the rotation shaft 20 is easily cancelled.
  • the movable member 28 includes the communication passages 28 r that communicate the back pressure region and the primary voids K 1 . This ensures that the primary voids K 1 function as part of the back pressure region and contrasts to a structure in which the movable member 28 does not include the communication passages 28 r. Consequently, when the secondary voids K 2 become part of the discharge pressure region due to actuation of the switching valve 70 , the difference between the pressure in the primary voids K 1 and the pressure in secondary voids K 2 is ensured to move the valve bodies 21 v toward the movable scroll 23 .
  • the shaft support 21 includes a plurality of valve chambers 21 b separated from one another in the circumferential direction.
  • the shaft support 21 also includes the branch passage 71 extending from the switching valve 70 to the valve chambers 21 b. This facilitates restriction of the radial movement of the movable member 28 and contrasts to a structure in which the shaft support 21 includes only one valve chamber 21 b and the radial movement of the movable member 28 is restricted by only one valve body 21 v.
  • the movable member 28 includes the fitting recesses 28 k to which the corresponding valve bodies 21 v can be fitted.
  • the switching valve 70 brings the secondary voids K 2 into communication with the discharge pressure region and the difference between the pressure in the primary voids K 1 and the pressure in the secondary voids K 2 moves the valve bodies 21 v toward the movable scroll 23 , the valve bodies 21 v are fitted to the corresponding fitting recesses 28 k. This further facilitates the restriction of radial movement of the movable member 28 .
  • the seat member 24 is arranged between the movable scroll 23 and the movable member 28 .
  • the seat member 24 is fixed to the motor housing member 12 and receives the movable member 28 that is pressed toward the movable scroll 23 by the valve bodies 21 v. This facilitates the restriction of radial movement of the movable member 28 compared to a structure in which the radial movement of the movable member 28 is restricted by holding the movable member 28 between the valve bodies 21 v and the movable scroll 23 , for example.
  • Each valve body 21 v includes the semispherical distal end that faces toward the movable scroll 23 .
  • the surface of each fitting recess 28 k is tapered so that the diameter of the fitting recess 28 k increases from the side that faces toward the movable scroll 23 to the end surface that faces away from the movable scroll 23 .
  • the end surface of the movable member 28 that faces away from the movable scroll 23 includes a conical projection 81 .
  • the conical projection 81 includes a conical projection surface 81 a that surrounds the bushing 20 b and has a diameter that decreases as the movable scroll 23 becomes farther.
  • an annular seal 28 s is arranged in the outer circumferential surface of the movable member 28 .
  • the seal 28 s has an outer surface that is located radially outward from the outer circumferential surface of the movable member 28 . Accordingly, a clearance C 2 is formed between the movable member 28 and the shaft support 21 in the radial direction.
  • the seal 28 s can be elastically deformed to allow the movable member 28 to move in the radial direction in the range of the distance of the clearance C 2 .
  • the accommodating recess 21 h accommodates a tip seal 29 arranged on the end surface of the movable member 28 that faces away from the movable scroll 23 .
  • the tip seal 29 seals the gap between the shaft support 21 and the movable member 28 .
  • the end surface of the movable member 28 that faces away from the movable scroll 23 includes an accommodating groove 28 g that can accommodate the tip seal 29 .
  • the accommodating recess 21 h is divided into a primary void K 1 and a secondary void K 2 .
  • the primary void K 1 is located between the movable scroll 23 and the secondary void K 2
  • the secondary void K 2 is located between the seal 28 s and the tip seal 29 .
  • the shaft support 21 includes a communication flow passage 83 that communicates the switching valve 70 and the secondary void K 2 .
  • the primary void K 1 is in communication with the first oil passage 65 , which is in communication with the back pressure chamber 62 .
  • the primary void K 1 functions as part of the back pressure region.
  • the shaft support 21 includes a conical recess 82 on the side that faces the movable member 28 .
  • the conical recess 82 includes a conical recess surface 82 a that surrounds the bushing 20 b and has a diameter that decreases as the movable member 28 becomes farther.
  • the conical projection 81 is movable toward and away from the conical recess 82 .
  • the switching valve 70 brings the secondary void K 2 into communication with the communication passage 69 through the communication flow passage 83 .
  • the difference between the pressure in the primary void K 1 and the pressure in the secondary void K 2 moves the movable member 28 away from the movable scroll 23 .
  • This moves the conical projection 81 toward the conical recess 82 and brings the conical projection surface 81 a and conical recess surface 82 a into contact with each other.
  • the conical projection 81 is fitted into the conical recess 82 and thereby restricts the radial movement of the movable member 28 .
  • the orbital radius of the movable scroll 23 is decreased compared to when the movable member 28 is not restricted and freely movable.
  • the switching valve 70 brings the secondary void K 2 into communication with the second oil passage 68 through the communication flow passage 83 .
  • This allows the lubricating oil flowing in the second oil passage 68 from the oil-separating chamber 42 to flow into the secondary void K 2 through the switching valve 70 and the communication flow passage 83 . Consequently, the secondary void K 2 becomes part of the discharge pressure region.
  • the difference between the pressure in the primary void K 1 and the pressure in the secondary void K 2 moves the movable member 28 toward the movable scroll 23 .
  • This moves the conical projection 81 away from the conical recess 82 and allows the movable member 28 to move freely.
  • the orbital radius of the movable scroll 23 is increased compared to when the radial movement of the movable member 28 is restricted.
  • the conical projection 81 , the conical recess 82 , the primary void K 1 , the secondary void K 2 , the communication passage 69 , and the switching valve 70 form a switching mechanism.
  • the second embodiment has the following advantages in addition to advantage (1) of the first embodiment.
  • the second embodiment does not require the valve chambers 21 b or the valve bodies 21 v of the first embodiment and has a simple structure.
  • the movable member 28 does not have to include the fitting recesses 28 k. Instead, the valve bodies 21 v may be pressed against the end surface of the movable member 28 that faces away from the movable scroll 23 to restrict radial movement of the movable member 28 with the friction produced between the valve bodies 21 v and the movable member 28 .
  • the communication passages 28 r may be omitted.
  • the primary voids K 1 can still become the back pressure region due to the refrigerant flowing into the primary voids K 1 from the back pressure chamber 62 through the gap between the movable member 28 and the shaft support 21 .
  • the number of the valve chambers 21 b is not limited.
  • the seat member 24 may be omitted.
  • the radial movement of the movable member 28 may be restricted by holding the movable member 28 between the valve bodies 21 v and the movable scroll 23 , for example.
  • the shape of the valve body 21 v is not limited.
  • the valve body 21 v may be spherical.
  • the surface of the fitting recesses 28 k may extend in the axial direction, for example.
  • the secondary void K 2 does not have to be in communication with the suction pressure region or the discharge pressure region as long as the secondary void K 2 is in communication with a low pressure region that has a lower pressure than the back pressure region or a high pressure region that has a higher pressure than the back pressure region.
  • the bushing 20 b may be fixed to the eccentric shaft 20 a, and the radial movement of the movable scroll 23 may be permitted by a gap between the movable scroll 23 and the bearing B 3 or a gap between the bushing 20 b and the bearing B 3 .
  • the secondary void K 2 receives lubricating oil from the oil-separating chamber 42 through the second oil passage 68 .
  • the secondary void K 2 may be in communication with the discharge chamber 131 so that refrigerant having the discharge pressure is delivered to the secondary void K 2 .
  • the movable scroll 23 may include a plurality of pins that are integrated with the movable scroll 23 , and the movable member 28 may include a plurality of circular holes into which the respective pins are loosely fitted.
  • the present invention may be embodied in a scroll compressor that is directly driven by a driving source such as an engine, instead of being driven by the electric motor M.

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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)
US14/076,693 2012-11-13 2013-11-11 Scroll compressor Abandoned US20140134033A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012249186A JP6007737B2 (ja) 2012-11-13 2012-11-13 スクロール型圧縮機
JP2012-249186 2012-11-13

Publications (1)

Publication Number Publication Date
US20140134033A1 true US20140134033A1 (en) 2014-05-15

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US14/076,693 Abandoned US20140134033A1 (en) 2012-11-13 2013-11-11 Scroll compressor

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US (1) US20140134033A1 (de)
EP (1) EP2730741A2 (de)
JP (1) JP6007737B2 (de)
KR (1) KR20140061251A (de)
CN (1) CN103807167A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140134032A1 (en) * 2012-11-13 2014-05-15 Kabushiki Kaisha Toyota Jidoshokki Scroll compressor
US20180363464A1 (en) * 2016-02-25 2018-12-20 Bitzer Kuehlmaschinenbau Gmbh Compressor
US11193476B2 (en) * 2016-12-21 2021-12-07 Samsung Electronics Co., Ltd. Scroll compressor

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107605727A (zh) * 2017-09-04 2018-01-19 珠海格力电器股份有限公司 涡旋压缩机
WO2019168526A1 (en) * 2018-02-28 2019-09-06 Hitachi-Johnson Controls Air Conditioning, Inc. Dynamic radial compliance in scroll compressors

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57198386A (en) * 1981-05-30 1982-12-04 Sanden Corp Scroll type fluid system
JP3560492B2 (ja) * 1999-02-25 2004-09-02 株式会社日本自動車部品総合研究所 スクロール型圧縮機
JP2000352389A (ja) * 1999-06-08 2000-12-19 Mitsubishi Heavy Ind Ltd スクロール圧縮機
US6217302B1 (en) * 2000-02-24 2001-04-17 Scroll Technologies Floating seal bias for reverse fun protection in scroll compressor
JP3913106B2 (ja) * 2002-05-22 2007-05-09 株式会社デンソー 可変容量型流体圧送機
JP2006274970A (ja) * 2005-03-30 2006-10-12 Sanden Corp スクロール圧縮機

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140134032A1 (en) * 2012-11-13 2014-05-15 Kabushiki Kaisha Toyota Jidoshokki Scroll compressor
US9181951B2 (en) * 2012-11-13 2015-11-10 Kabushiki Kaisha Toyota Jidoshokki Scroll compressor
US20180363464A1 (en) * 2016-02-25 2018-12-20 Bitzer Kuehlmaschinenbau Gmbh Compressor
US11041386B2 (en) * 2016-02-25 2021-06-22 Bitzer Kuehlmaschinenbau Gmbh Compressor with a carrier element for support a compressor body base
US11193476B2 (en) * 2016-12-21 2021-12-07 Samsung Electronics Co., Ltd. Scroll compressor

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JP2014098317A (ja) 2014-05-29
CN103807167A (zh) 2014-05-21
KR20140061251A (ko) 2014-05-21
JP6007737B2 (ja) 2016-10-12
EP2730741A2 (de) 2014-05-14

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