US20170268340A1 - Scroll Fluid Machine - Google Patents
Scroll Fluid Machine Download PDFInfo
- Publication number
- US20170268340A1 US20170268340A1 US15/505,435 US201515505435A US2017268340A1 US 20170268340 A1 US20170268340 A1 US 20170268340A1 US 201515505435 A US201515505435 A US 201515505435A US 2017268340 A1 US2017268340 A1 US 2017268340A1
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- United States
- Prior art keywords
- bush
- slide bush
- scroll
- receiving hole
- spring
- 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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Classifications
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- 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
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C1/00—Rotary-piston machines or engines
- F01C1/02—Rotary-piston machines or engines of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
- F01C1/0207—Rotary-piston machines or engines of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
- F01C1/0215—Rotary-piston machines or engines of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form where only one member is moving
-
- 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
- F01C11/00—Combinations of two or more machines or engines, each being of rotary-piston or oscillating-piston type
- F01C11/002—Combinations of two or more machines or engines, each being of rotary-piston or oscillating-piston type of similar working principle
- F01C11/004—Combinations of two or more machines or engines, each being of rotary-piston or oscillating-piston type of similar working principle and of complementary function, e.g. internal combustion engine with supercharger
-
- 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
- F01C13/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01C13/04—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby for driving pumps or compressors
-
- 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
- F01C21/007—General arrangements of parts; Frames and supporting elements
-
- 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
- F01C21/008—Driving elements, brakes, couplings, transmissions specially adapted for rotary or oscillating-piston machines or engines
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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
- 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
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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
- 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
- F04C23/001—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 of similar working principle
- F04C23/003—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 of similar working principle having complementary function
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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
- 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
- F04C29/005—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions
- F04C29/0071—Couplings between rotors and input or output shafts acting by interengaging or mating parts, i.e. positive coupling of rotor and shaft
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C1/00—Rotary-piston machines or engines
- F01C1/02—Rotary-piston machines or engines of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
- F01C1/0207—Rotary-piston machines or engines of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
- F01C1/0246—Details concerning the involute wraps or their base, e.g. geometry
- F01C1/0269—Details concerning the involute wraps
- F01C1/0276—Different wall heights
-
- 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
- F04C18/0269—Details concerning the involute wraps
- F04C18/0276—Different wall heights
-
- 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
Definitions
- the present invention relates to a scroll fluid machine in which a working chamber of a working fluid is formed between the wraps of a fixed scroll and a movable scroll.
- a single-plate type compressor-integrated expander which includes a scroll unit composed of a movable scroll provided with a wrap provided on a base surface thereof, and a fixed scroll provided with a wrap on a base surface thereof that meshes with the wrap of the movable scroll, and in which a working chamber of the scroll unit is divided into a compression chamber and an expansion chamber by a partition, thereby forming a compression section and an expansion section (refer to, for example, Patent Document 1).
- Patent Document 1 Publication of Japanese Patent No. 5209764
- Patent Document 2 Publication of Japanese Patent No. 3687279
- the eccentric bush is slidable and rotatable with respect to a fixed shaft and the movable scroll, thus posing a problem in that the slide bush or the spring provided in the eccentric bush comes off during an operation.
- the present invention has been made to solve the technological problem with the prior art described above, and an object of the invention is to provide a scroll fluid machine in which the dislodgement of a slide bush and a spring biasing the slide bush, which are provided in an eccentric bush to correct misalignment, is prevented by a simple structure.
- a scroll fluid machine includes: a scroll unit which is composed of a fixed scroll and a movable scroll each having spiral wraps formed on base surfaces of base plates thereof, the spiral wraps opposing each other, and in which a working chamber of a working fluid is formed between the wraps of the fixed scroll and the movable scroll by an orbital motion of the movable scroll about an axis of the fixed scroll; a frame having a pedestal which orbitably supports the movable scroll at an outer peripheral portion of a rear surface on the opposite side from the base surface of the movable scroll; and a support mechanism which orbitably supports the movable scroll at a central portion of the rear surface of the movable scroll, wherein the support mechanism includes: a boss provided on the rear surface of the movable scroll; an eccentric bush slidably and rotatably fitted in the boss; a slide bush placed in a receiving hole formed in the eccentric bush such that the slide bush is movable in the direction of eccentricity of the eccentric bush;
- the scroll fluid machine according to the invention of claim 2 is characterized in that the receiving hole is formed passing through the eccentric bush, the engagement projections are formed on both end portions of the slide bush, and the engagement projections engage with both opening edge portions of the receiving hole of the eccentric bush in a state in which the slide bush has been moved by the biasing force of the spring in the foregoing invention.
- the scroll fluid machine according to the invention of claim 3 is characterized in that the receiving hole is composed of a large-diameter section formed passing through the eccentric bush and a small-diameter section continuing from the large-diameter section in the direction of eccentricity, the engagement projections are formed on peripheral edges at both ends of the slide bush, and in a state in which the slide bush has been placed in the large-diameter section of the receiving hole and then the slide bush has been moved into the small-diameter section by the biasing force of the spring, the portions of the engagement projections positioned in the direction of the movement engage with both opening edge portions of the small-diameter section of the receiving hole, and the portions of the engagement projections positioned on the opposite side from the direction of the movement double as the spring holding section in the foregoing inventions.
- the scroll fluid machine according to the invention of claim 4 is characterized in that the receiving hole is formed passing through the eccentric bush, the engagement projections are formed on the other end portion of the slide bush and engage with an opening edge portion of the receiving hole in a state in which the slide bush has been moved by the biasing force of the spring, and one end portion of the slide bush is provided with a fastener for preventing the slide bush and the spring from falling off, the fastener being positioned outside the receiving hole, in the invention of claim 1 .
- the scroll fluid machine according to the invention of claim 5 is characterized in that the spring holding section has a sloping surface that inclines downward toward an opening direction of the receiving hole in the foregoing inventions.
- the scroll fluid machine according to the invention of claim 6 is characterized in that the scroll unit is composed of an expansion section which expands a working fluid in an expansion chamber formed between the wraps of the fixed scroll and the movable scroll thereby to orbit the movable scroll to recover motive power and a compression section which compresses the working fluid by the motive power, which has been recovered by the expansion section, in a compression chamber formed between the wraps of the both scrolls in the foregoing inventions.
- the scroll fluid machine according to the invention of claim 7 is characterized in that carbon dioxide is used as the working fluid in the foregoing inventions.
- the scroll fluid machine includes: a scroll unit which is composed of a fixed scroll and a movable scroll each having spiral wraps on base surfaces of base plates thereof, the spiral wraps being formed to oppose each other, and in which a working chamber of a working fluid is formed between the wraps of the fixed scroll and the movable scroll by an orbital motion of the movable scroll about an axis of the fixed scroll; a frame having a pedestal which orbitably supports the movable scroll at an outer peripheral portion of a rear surface on the opposite side from the base surface of the movable scroll; and a support mechanism which orbitably supports the movable scroll at a central portion of the rear surface of the movable scroll, wherein the support mechanism includes: a boss provided on the rear surface of the movable scroll; an eccentric bush slidably and rotatably fitted in the boss; a slide bush placed in a receiving hole formed in the eccentric bush such that the slide bush is movable in the direction of eccentricity of the eccentric bush; a fixed shaft which is
- the spring is retained by the spring holding section formed on the slide bush, and the engagement projections also formed on the slide bush engage with the eccentric bush by the biasing force of the spring, thus preventing the slide bush from falling off.
- the configuration according to the invention of claim 3 can also make it possible to stably retain the slide bush and the spring in the receiving hole of the eccentric bush so as to prevent the slide bush and the spring from falling off.
- the receiving hole is composed of a large-diameter section formed passing through the eccentric bush and a small-diameter section continuing from the large-diameter section in the direction of eccentricity
- the engagement projections are formed on the peripheral edges at both ends of the slide bush, and in a state in which the slide bush has been placed in the large-diameter section of the receiving hole and then moved into the small-diameter section by the biasing force of the spring, the portions of the engagement projections positioned in the direction of the movement engage with both opening edge portions of the small-diameter section of the receiving hole, and the portions of the engagement projections positioned on the opposite side from the direction of the movement double as the spring holding section.
- the receiving hole may be formed passing through the eccentric bush
- the engagement projection may be formed on the other end portion of the slide bush and engaged with an opening edge portion of the receiving hole in a state in which the slide bush has been moved by the biasing force of the spring
- one end portion of the slide bush may be provided with a fastener positioned outside the receiving hole to prevent the slide bush and the spring from falling off, the fastener being positioned outside the receiving hole.
- the engagement projection is required to be formed only on the other end portion of the slide bush, and the fastener is attached to one end portion of the slide bush after the spring is inserted into the receiving hole between the eccentric bush and the slide bush, thus advantageously facilitating the assembly work.
- providing the spring holding section with a sloping surface that inclines downward toward an opening direction of the receiving hole enables the spring to be inserted into the receiving hole between the eccentric bush and the slide bush by using the sloping surface. This arrangement makes the spring installation work extremely easy.
- the foregoing inventions are especially effective in the case where carbon dioxide is used as a working fluid, as in claim 7 .
- FIG. 1 is a longitudinal side view of a scroll fluid machine according to an embodiment to which the present invention has been applied;
- FIG. 2 is a top plan view of a fixed scroll in FIG. 1 , which is observed from a base surface side;
- FIG. 3 is a sectional view taken on line A-A in FIG. 2 ;
- FIG. 4 is an enlarged view of a support mechanism illustrated in FIG. 1 ;
- FIG. 5 is a perspective view of an eccentric bush to which a slide bush illustrated in FIG. 1 has been attached (a first embodiment);
- FIG. 6 is a top plan view of the eccentric bush illustrated in FIG. 5 ;
- FIG. 7 is a sectional view taken on line B-B in FIG. 6 ;
- FIG. 8 is a sectional view taken on line C-C in FIG. 7 ;
- FIG. 9 is a refrigerant circuit diagram of a refrigerating cycle of the embodiment using the scroll fluid machine illustrated in FIG. 1 ;
- FIG. 10 is a top plan view of an eccentric bush to which a slide bush according to another embodiment of the present invention has been attached (a second embodiment);
- FIG. 11 is a sectional view taken on line D-D in FIG. 10 ;
- FIG. 12 is a top plan view of an eccentric bush to which a slide bush according to a further embodiment of the present invention has been attached (a third embodiment);
- FIG. 13 is a sectional view taken on line E-E in FIG. 12 ;
- FIG. 14 is a perspective view of an eccentric bush to which a slide bush according to yet another embodiment of the present invention has been attached (a fourth embodiment);
- FIG. 15 is a top plan view of the eccentric bush illustrated in FIG. 14 ;
- FIG. 16 is a sectional view taken on line F-F in FIG. 15 ;
- FIG. 17 is a sectional view taken on line G-G in FIG. 16 .
- FIG. 1 is a longitudinal side view of a scroll fluid machine 1 according to an embodiment.
- the scroll fluid machine 1 according to the embodiment is, for example, a vertical single-plate type compressor-integrated expander, and used in a refrigerating cycle RC (refer to FIG. 9 ) of a heat pump or the like that uses carbon dioxide, which has a supercritical pressure on the high pressure side, as a refrigerant (working fluid).
- the refrigerating cycle RC is incorporated in an air conditioner or a heat pump type water heater (not illustrated). The configuration of the refrigerating cycle RC will be described in detail hereinafter.
- the scroll fluid machine 1 has an expansion section 2 , which performs an expanding operation by the pressure of a refrigerant and which will be discussed hereinafter, and a compression section 3 (on a low stage side), which performs a compressing operation by the expanding operation of the expansion section 2 ( FIG. 2 ).
- the scroll fluid machine 1 includes a housing 4 .
- a scroll unit 8 composed primarily of a fixed scroll 6 and a movable scroll 7 which is orbited with respect to the fixed scroll 6 , a main frame (frame) 9 which orbitably supports the movable scroll 7 , and a fixed shaft 11 which is fixed to the bottom surface of the main frame 9 and which is provided protruding from the bottom surface of the main frame 9 .
- the housing 4 is composed of a main shell 12 , which is the main body, a cap-shaped top shell 13 , which covers the top of the main shell 12 , and a cap-shaped bottom shell 14 which covers the bottom of the main shell 12 .
- the housing 4 is assembled by fastening the top shell 13 and the bottom shell 14 to each other by bolts, sandwiching the main shell 12 through a sealing material, such as an O-ring, and the interior of the housing 4 is hermetically sealed against the exterior. Further, the outer peripheral portion of the main frame 9 is fixed to the inner side of the main shell 12 .
- Acting inside the hermetically sealed housing 4 is a pressure obtained by compressing a refrigerant (carbon dioxide), which has been taken in from the refrigerating cycle RC as the working fluid of the scroll fluid machine 1 , by the compression section 3 .
- a refrigerant carbon dioxide
- An expansion-side suction pipe 16 through which the refrigerant taken in from the refrigerating cycle RC is supplied to the expansion section 2 is connected to the top shell 13 .
- the ends of the expansion-side suction pipe 16 and the expansion-side discharge pipe 17 are opened to and in communication with an expansion-side suction chamber 19 and an expansion-side discharge chamber 21 , respectively, which are formed in a base plate 6 a of the fixed scroll 6 .
- the end of the compression-side discharge pipe 18 is opened into the main shell 12 and in communication with a compression-side discharge chamber 22 , which is formed inside the top shell 13 , through the interior of the main shell 12 .
- a compression-side suction pipe 23 (illustrated in FIG. 3 , and positioned on the front side in FIG. 1 ), through which the refrigerant taken in from the refrigerating cycle RC is supplied to the compression section 3 , is connected to the main shell 12 .
- the end of the compression-side suction pipe 23 is opened to and in communication with a compression-side suction chamber 24 formed in the base plate 6 a of the fixed scroll 6 .
- a lubricant chamber 26 is formed inside the bottom shell 14 , and a lubricant for lubricating the scroll unit 8 is reserved in the lubricant chamber 26 .
- An oil feed hole 27 ( FIG. 2 ), which passes through the base plate 6 a of the fixed scroll 6 and the main frame 9 , is opened in the compression-side suction chamber 23 described above. The lubricant in the lubricant chamber 26 is fed to the compression-side suction chamber 24 through the oil feed hole 27 .
- an oil supply passage 28 is drilled in the fixed shaft 11 along the axial direction of the fixed shaft 11 .
- the lower end of the oil supply passage 28 is opened to the lubricant chamber 26 , while the upper end is opened to the space in a boss (recess) 31 , which will be discussed hereinafter.
- the fixed scroll 6 is fixed to an upper surface 9 a of the main frame 9 .
- a compression-side discharge hole 32 which will be discussed hereinafter, is formed passing through slightly closer to the center in the radial direction of the fixed scroll 6 than the foregoing compression-side suction chamber 24 of the base plate 6 a of the fixed scroll 6 .
- An oil separator 33 which separates the lubricant in the refrigerant, is attached to the opening of the compression-side discharge hole 32 relative to the compression-side discharge chamber 22 .
- the movable scroll 7 is supported by a pedestal 9 b of the main frame 9 such that the movable scroll 7 is enabled to perform an orbital motion without rotating via an anti-rotation mechanism 34 , such as an Oldham ring.
- the anti-rotation mechanism 34 is fitted in the pedestal 9 b and slidably passed through to a rear surface 7 c , which is a surface on the opposite side from a base surface 7 b of a base plate 7 a , as the movable scroll 7 performs the orbital motion.
- the foregoing cylindrical boss 31 in which an eccentric bush 36 to be discussed hereinafter is slidably and rotatably fitted by insertion, is protrusively provided on the rear surface 7 c of the movable scroll 7 .
- the scroll unit 8 is a so-called single-plate type scroll unit, in which both the compression section 3 and the expansion section 2 can be formed as the working chambers of a refrigerant by a pair of the fixed scroll 6 and the movable scroll 7 in the compressor-integrated expander.
- the fixed shaft 11 simply orbitably supports the movable scroll 7 together with the main frame 9 , and the fixed shaft 11 itself is not rotatively driven.
- annular intermediate partition (annular wall) 38 and an annular outer partition 39 are provided in a standing manner on a base surface 6 b of the fixed scroll 6 .
- a spiral outer fixed scroll wrap (wrap) 40 is provided in a standing manner between the intermediate partition 38 and the outer partition 39
- a spiral inner fixed scroll wrap (wrap) 41 is provided in a standing manner at a position closer to the center than the intermediate partition 38 is.
- annular groove 42 in which a seal ring (not illustrated) is fitted by insertion, is concavely provided in the edge surface of the intermediate partition 38 .
- the foregoing compression-side suction chamber 24 is formed on the outer circumferential end of the compression section 3 slightly toward the inner side of the outer partition 39 , and the compression-side discharge hole 32 is formed on the inner circumferential end of the compression section 3 slightly toward the outer side of the intermediate partition 38 .
- the foregoing expansion-side discharge chamber 21 is formed on the outer circumferential end of the expansion section 2 slightly toward the inner side of the intermediate partition 38 , and the foregoing expansion-side suction chamber 19 is formed at the central portion, which is the inner circumferential end of the expansion section 2 .
- annular oil groove 43 is formed slightly toward the outer side of the outer partition 39 , and the foregoing oil feed hole 27 is formed in the bottom surface of a recess formed by spot facing to a predetermined depth and to a diameter that is larger than the width of the groove provided over the oil groove 43 .
- a spiral outer movable scroll wrap (wrap) 44 which meshes with the outer fixed scroll wrap 40
- a spiral inner movable scroll wrap (wrap) 46 which meshes with the inner fixed scroll wrap 41 , are provided in a standing manner such that the spirals thereof are in opposite directions from each other.
- the expansion section 2 is formed on the inner side with respect to the intermediate partition 38 , and the compression section 3 is formed between the intermediate partition 38 and the outer partition 39 .
- the refrigerant taken in through the expansion-side suction pipe 16 is introduced into the expansion section 2 via the expansion-side suction chamber 19 , and expanded in the expansion chamber (working chamber), which is formed between the wraps 41 and 46 , by the scrolls 6 and 7 operating together.
- the volume of the expansion chamber is increased as the expansion chamber moves toward the outer peripheries of the scrolls 6 and 7 , thus causing the movable scroll 7 to perform an orbital motion about the axis of the fixed scroll 6 .
- the refrigerant subjected to the orbital motion of the movable scroll 7 passes through the expansion-side discharge chamber 21 and is discharged toward the refrigerating cycle RC outside the housing 4 through the expansion-side discharge pipe 17 .
- the refrigerant introduced from the compression-side suction pipe 23 is taken into the compression section 3 via the compression-side suction chamber 24 .
- the movable scroll 7 is caused to perform an orbital motion about the axis of the fixed scroll 6 so as to compress, by the scrolls 6 and 7 operating together, the refrigerant in the compression chamber (working chamber) formed between the wraps 40 and 44 .
- the volume of the compression chamber decreases as the compression chamber moves toward the centers of the scrolls 6 and 7 .
- the refrigerant that has been turned into a high-pressure refrigerant passes through the compression-side discharge hole 32 and the compression-side discharge chamber 22 and is discharged through the compression-side discharge pipe 18 toward the refrigerating cycle RC outside the housing 4 .
- the lubricant in the refrigerant discharged through the compression-side discharge hole 32 into the compression-side discharge chamber 22 is separated from the refrigerant when the refrigerant passes through the oil separator 33 , as indicated by the dashed line arrow in FIG. 1 .
- the lubricant separated from the refrigerant passes through an oil return passage 47 formed in the main frame 9 and is reserved in the lubricant chamber 26 .
- the lubricant reserved in the lubricant chamber 26 is moved up through the oil supply passage 28 by the pressure difference between the lubricant chamber 26 and the compression-side suction chamber 24 and discharged from the upper end of the fixed shaft 11 so as to lubricate a bearing 49 , a bearing 48 and a bearing 51 , which will be discussed hereinafter.
- the lubricant then reaches a back pressure chamber 52 formed between the pedestal 9 b of the main frame 9 and the rear surface 7 c of the movable scroll 7 , and reaches the compression-side suction chamber 24 through the oil feed hole 27 .
- FIG. 9 is a refrigerant circuit diagram of the refrigerating cycle RC (embodiment) using the scroll fluid machine 1 according to the present invention.
- the expansion section 2 and the compression section 3 of the scroll fluid machine 1 are illustrated in a separated manner.
- the compression section 3 driven by the motive power recovered by the expansion section 2 of the scroll fluid machine 1 constitutes a low stage side compressor (a low stage side compression section) in the refrigerating cycle RC.
- the foregoing compression-side discharge pipe 18 of the compression section 3 is connected to a high stage side compression section 70 a driven by an electric motor 70 b of a high stage side compressor 70 positioned in a rear stage of the compression section 3 .
- a gas cooler 71 which cools the refrigerant, is connected to the rear stage of the compression section 70 a .
- the expansion section 2 and an expansion valve 72 of the scroll fluid machine 1 are connected in parallel between the outlet of the gas cooler 71 and the inlet of an evaporator 73 .
- the refrigerant from the gas cooler 71 is taken into the expansion-side suction chamber 19 of the expansion section 2 through the foregoing expansion-side suction pipe 16 . Further, the refrigerant is sent from the expansion section 2 of the scroll fluid machine 1 to the evaporator 73 through the expansion-side discharge pipe 17 . Then, the refrigerant from the evaporator 73 is introduced into the compression section 3 of the scroll fluid machine 1 through the compression-side suction pipe 23 .
- An intermediate pressure refrigerant (the carbon dioxide refrigerant), the pressure of which has been increased by the low stage side compression section 3 driven by the expansion section 2 of the scroll fluid machine 1 , is sent through the compression-side discharge pipe 18 to the high stage side compressor 70 , and the pressure thereof is further increased to a high pressure (supercritical) by the compression section 70 a driven by the electric motor 70 b .
- the high-pressure refrigerant is cooled by the gas cooler 71 while remaining in the supercritical state, and then a part thereof is taken into the expansion section 2 of the scroll fluid machine 1 through the expansion-side suction pipe 16 and expanded to decrease the pressure.
- the rest of the refrigerant is sent to the expansion valve 72 whereby to be expanded to decrease the pressure.
- the expansion valve 72 is provided in order to adjust the flow rate of the refrigerant passing through the expansion section 2 of the scroll fluid machine 1 .
- the refrigerant isentropically expands, causing the movable scroll 7 to perform the orbital motion, and the motive power is thereby recovered.
- the compression section 3 is operated as the low stage side compressor by the orbital motion of the movable scroll 7 .
- the refrigerant expanded by the expansion section 2 is heated by the evaporator 73 (or an object is cooled thereby), and drawn into the compression section 3 of the scroll fluid machine 1 again through the compression-side suction pipe 23 .
- the compression section 3 of the scroll fluid machine 1 carries out a part (the low stage side) of the compression process of the refrigerating cycle RC, while the compression section 70 a of the compressor 70 on the high stage side carries out the rest (the high stage side) of the compression process.
- the compression power in the compression section 3 is provided by the recovered power in the expansion section 2 .
- the sliding portions between the anti-rotation mechanism 34 and the pedestal 9 b and the rear surface 7 c of the movable scroll 7 are lubricated by the lubricant.
- the interior of the housing 4 is maintained at the discharge pressure of the compression section 3 discharged into the compression-side discharge chamber 22 through the compression-side discharge hole 32 as described above, so that the lubricant maintained at a pressure close to the discharge pressure of the compression section 3 is supplied to the back pressure chamber 52 through the oil supply passage 28 . Therefore, from the back pressure chamber 52 , the movable scroll 7 is urged and pressed against the fixed scroll 6 under the discharge pressure of the compression section 3 .
- the back pressure from the back pressure chamber 52 enables the smooth orbital motion of the movable scroll 7 with respect to the fixed scroll 6 .
- the scroll unit 8 is driven by the expansion energy of the refrigerant, and the driving force of the scroll unit 8 generates the compression energy of the refrigerant.
- the fixed shaft 11 constitutes a support mechanism 54 which orbitably supports the movable scroll 7 together with the main frame 9 at the central portion of the rear surface 7 c.
- FIG. 4 which is an enlarged sectional view of the support mechanism 54 of the movable scroll 7
- the upper end portion of the fixed shaft 11 is inserted in an insertion hole 57 of a slide bush 56 such that the upper end portion is made slidable and rotatable by the bearing 49 .
- the slide bush 56 is accommodated in a receiving hole 58 , which is formed passing through a columnar insertion section 36 a in the axial direction thereof, the insertion section 36 a being positioned at the center of the eccentric bush 36 , such that the slide bush 56 is movable in the direction of eccentricity of the eccentric bush 36 .
- the upper end portion of the fixed shaft 11 is inserted in the eccentric bush 36 through the slide bush 56 .
- the insertion section 36 a of the eccentric bush 36 is slidably and rotatably fitted in the boss 31 through the bearing 48 .
- the bearing 48 receives a radial load applied to the eccentric bush 36 as the movable scroll 7 performs the orbital motion.
- a flanged portion 36 b which has a diameter that is larger than the diameter of the boss 31 , is formed at the lower end of the insertion section 36 a of the eccentric bush 36 , and a bearing 51 is provided between the flanged portion 36 b and the main frame 9 .
- a balance weight 59 which has an L-shaped section, is integrally formed on the flanged portion 36 b . The balance weight 59 is rotated in the space between the movable scroll 7 and the main frame 9 as the movable scroll 7 performs the orbital motion.
- the fixed shaft 11 orbitably supports the movable scroll 7 through the intermediary of the bearing 49 , the slide bush 56 , the eccentric bush 36 , the bearing 48 , and the bearing 51 .
- the support mechanism 54 is comprised of the boss 31 , the eccentric bush 36 , the slide bush 56 , the fixed shaft 11 , and a spring 61 , which will be discussed hereinafter.
- the receiving hole 58 of the eccentric bush 36 is formed passing through the insertion section 36 a positioned at the center of the eccentric bush 36 , and has a section that is longer in the direction of eccentricity of the eccentric bush 36 , as illustrated in the drawings.
- the receiving hole 58 has a pair of flat surfaces 58 a , which extend in the direction of eccentricity and oppose each other. Further, both opening end portions of the receiving hole 58 are provided with engagement recesses 58 b , which are concavely formed at one end in the direction of eccentricity.
- the slide bush 56 has a substantially cylindrical shape, the receiving hole 58 described above being formed passing through the center of the slide bush 56 .
- the bearing 49 is installed to the inner wall surface of the receiving hole 58 .
- Both end portions in the axial direction of the receiving hole 58 of the slide bush 56 are provided with engagement projections 56 a , which are formed protruding outward and positioned at one end in the direction of eccentricity of the eccentric bush 36 .
- a spring holding section 56 b which is recessed except both end portions in the axial direction, is formed on the other end.
- both side walls of the slide bush 56 positioned in the direction of eccentricity of the eccentric bush 36 are formed of a pair of flat surfaces 56 c.
- the spring 61 is composed of a leaf spring having a sectional shape illustrated in FIG. 8 , and provided in the spring holding section 56 b recessed in the slide bush 56 .
- the slide bush 56 With the spring 61 provided in the spring holding section 56 b as described above, the slide bush 56 is installed in the receiving hole 58 formed passing through the insertion section 36 a of the eccentric bush 36 .
- the spring 61 is first compressed to move the slide bush 56 toward the other end in the direction of eccentricity of the eccentric bush 36 and then the slide bush 56 is inserted in the receiving hole 58 .
- the dimension from the outer ends of the wall at both ends of the spring holding section 56 b of the slide bush 56 to the outer ends of the engagement projections 56 a is smaller than the dimension of the receiving hole 58 in that particular direction.
- the dimension of each of the flat surfaces 56 c of the slide bush 56 is set such that each of the flat surfaces 56 c comes in slidable contact with the inner side of each of the flat surfaces 58 a of the receiving hole 58 .
- the spring 61 is interposed between the slide bush 56 and the eccentric bush 36 in the receiving hole 58 . With this arrangement, the slide bush 56 is inserted in the receiving hole 58 such that the slide bush 56 is movable in the direction of eccentricity of the eccentric bush 36 .
- the slide bush 56 is placed in the receiving hole 58 of the eccentric bush 36 such that the slide bush 56 is movable in the direction of eccentricity of the eccentric bush 36 , and the slide bush 56 is constantly biased in the direction of eccentricity of the eccentric bush 36 by the spring 61 . Further, the engagement between both engagement projections 56 a of the slide bush 56 and the engagement recesses 58 b of the receiving hole 58 prevents the slide bush 56 from falling off the eccentric bush 36 .
- the spring 61 is positioned in the spring holding section 56 b of the slide bush 56 and pressed against the eccentric bush 36 , thus also preventing the spring 61 from falling off the eccentric bush 36 .
- the dimensional relationship between the engagement projections 56 a and the engagement recesses 58 b is set such that the engagement therebetween is not released even when the slide bush 56 moves during an operation (the same will apply in the following embodiments).
- the support mechanism 54 for orbitably supporting the movable scroll 7 is comprised of the boss 31 provided on the rear surface of the movable scroll 7 , the eccentric bush 36 slidably and rotatably fitted in the boss 31 , the slide bush 56 placed in the receiving hole 58 , which is formed in the eccentric bush 36 , such that the slide bush 56 is movable in the direction of eccentricity of the eccentric bush 36 , the fixed shaft 11 , which is provided protruding from the bottom surface of the frame 9 and which is slidably and rotatably inserted in the insertion hole 57 formed in the slide bush 56 , and the spring 61 , which is interposed between the slide bush 56 in the receiving hole 58 and the eccentric bush 36 and which biases the slide bush 56 in the direction in which the slide bush 56 moves.
- the slide bush 56 has the spring holding section 56 b and the engagement projections 56 a , which protrude outward.
- the engagement projections 56 a engage with the engagement recesses 58 b of the receiving hole 58 of the eccentric bush 36 thereby to prevent the slide bush 56 from falling off the receiving hole 58 and the spring holding section 56 b prevents the spring 61 from falling off the receiving hole 58 .
- the misalignment of the scrolls 6 and 7 can be eliminated by the movement of the slide bush 56 in the direction of eccentricity by the biasing force of the spring 61 .
- the spring 61 is retained by the spring holding section 56 b formed on the slide bush 56 , and the engagement projections 56 a formed also on the slide bush 56 engage with the engagement recesses 58 b formed in the receiving hole 58 of the eccentric bush 36 by the biasing force of the spring 61 , thereby preventing the slide bush 56 from falling off.
- the simple machining namely, forming the spring holding section 56 b in a recessed shape in the slide bush 56 and protrusively providing the engagement projections 56 a , makes it possible to prevent the slide bush 56 and the spring 61 from falling off the eccentric bush 36 , thus permitting a reduction in production cost.
- the receiving hole 58 is formed passing through the insertion section 36 a of the eccentric bush 36 , and the engagement projections 56 a are formed on both end portions of the slide bush 56 , so that the engagement projections 56 a engage with the engagement recesses 58 b formed on both opening edge portions of the receiving hole 58 of the eccentric bush 36 in the state in which the slide bush 56 has been moved by the biasing force of the spring 61 .
- the engagement of the engagement projections 56 a at both ends makes it possible to further reliably prevent the slide bush 56 from falling off the receiving hole 58 of the eccentric bush 36 .
- a slide bush 56 in this case has a sloping surface 62 , which inclines downward in the direction of the opening of a receiving hole 58 and which is formed on the wall at one end portion in the axial direction (denoted by reference numeral 56 d in FIG. 10 and FIG. 11 ) that constitutes a spring holding section 56 b.
- the wall 56 d is formed to have a low height such that the wall 56 d is shaped like an arrowhead pointing in the direction of the opening of the receiving hole 58 .
- the rest of the configuration is the same as the configuration of the first embodiment described above.
- the spring 61 can be inserted into the receiving hole 58 between the eccentric bush 36 and the slide bush 56 by making use of the sloping surface 62 of the wall 56 d after the slide bush 56 is placed in the receiving hole 58 of the eccentric bush 36 .
- the inserted spring 61 engages with the vertical wall surface on the opposite side from the sloping surface 62 of the wall 56 d , thus preventing the spring 61 from falling off. Therefore, the slide bush 56 and the spring 61 can be assembled with great ease, as compared with the case where the slide bush 56 is placed in the receiving hole 58 , with the spring 61 provided in the spring holding section 56 b , as in the foregoing embodiment.
- a spring 61 is formed to have a circularly deformed tubular shape, as illustrated in FIG. 12 .
- a receiving hole 58 of an eccentric bush 36 is formed passing through in the axial direction of an insertion section 36 a .
- the receiving hole 58 is comprised of a large-diameter section 63 a , which is a circular hole having a large inside diameter, and a small-diameter section 63 b , which is a circular hole having an inside diameter that is smaller than the inside diameter of the large-diameter section 63 a .
- the small-diameter section 63 b continues to the large-diameter section 63 a in the direction of eccentricity of the eccentric bush 36 (the direction in which a slide bush 56 moves).
- engagement recesses 58 b are concavely formed in the portions corresponding to both opening edge portions of the small-diameter section 63 b.
- the slide bush 56 has a cylindrical shape, and engagement projections 56 a are formed on the peripheral edges at both ends in the axial direction of the slide bush 56 , the engagement projections 56 a being in a flange shape projecting outward.
- the outside diameter of the slide bush 56 is smaller than the inside diameter of the small-diameter section 63 b of the receiving hole 58 .
- the outside diameters of the engagement projections 56 a are sufficiently smaller than the inside diameter of the large-diameter section 63 a of the receiving hole 58 and larger than the inside diameter of the small-diameter section 63 b .
- the inside diameters of the engagement recesses 58 b are set to be larger than the outside diameter of the engagement projections 56 a .
- the rest of the configuration is the same as the configurations of the embodiments described above.
- a spring 61 is provided in a compressed state between the engagement projections 56 a at both ends such that the spring 61 is located on the opposite side from the small-diameter section 63 b (opposite side from the moving direction), as illustrated in FIG. 13 .
- the slide bush 56 is inserted into the large-diameter section 63 a of the receiving hole 58 .
- the outside diameters of the engagement projections 56 a of the slide bush 56 are sufficiently smaller than the inside diameter of the large-diameter section 63 a of the receiving hole 58 , thus enabling the slide bush 56 to be smoothly inserted into the large-diameter section 63 a.
- both engagement projections 56 a of the slide bush 56 engage in the engagement recesses 58 b of the small-diameter section 63 b , thus preventing the slide bush 56 from falling off the eccentric bush 36 .
- the spring 61 is positioned between the engagement projections 56 a on the opposite side from the small-diameter section 63 b of the slide bush 56 and pressed relative to the eccentric bush 36 , thus also preventing the spring 61 from falling off the eccentric bush 36 .
- the receiving hole 58 is composed of the large-diameter section 63 a formed passing through the eccentric bush 36 , and the small-diameter section 63 b , which continues to the large-diameter section 63 a in the direction of eccentricity, and the engagement projections 56 a are formed on the peripheral edges at both ends of the slide bush 56 .
- the portions of the engagement projections 56 a positioned in the direction of the movement engage with the engagement recesses 58 b formed in both opening edge portions of the small-diameter section 63 b of the receiving hole 58 , and the portions of the engagement projections 56 a positioned on the opposite side from the direction of the movement double as a spring holding section that retains the spring 61 .
- This arrangement enables the slide bush 56 and the spring 61 to be stably retained in the receiving hole 58 of the eccentric bush 36 , thus preventing the slide bush 56 and the spring 61 from falling off.
- the slide bush 56 is cylindrical, thus leading to a reduction in machining cost.
- an elliptical receiving hole 58 having the same diameter as that of the small-diameter section 63 b of the third embodiment illustrated in FIG. 12 and FIG. 13 is formed in an insertion section 36 a of an eccentric bush 36 .
- the elliptical receiving hole 58 is longer in the direction of eccentricity of the eccentric bush 36 .
- the engagement projection 56 a around one end portion in the axial direction of the slide bush 56 has been eliminated. Instead, one end portion of the slide bush 56 in the axial direction protrudes out of a receiving hole 58 , as illustrated in FIG. 16 .
- a groove 64 is concavely formed around the protruding portion.
- a C-shaped fastener (clip) 66 illustrated in FIG. 14 and FIG. 15 is fitted in the groove 64 .
- the engagement recess 58 b at one end in the axial direction of the receiving hole 58 of the eccentric bush 36 is not provided. The rest of the configuration is the same as the configurations of the embodiments described above.
- the slide bush 56 is first inserted in the receiving hole 58 from the other end side of the receiving hole 58 without installing a spring 61 .
- the spring 61 is inserted from one end side in the axial direction in a compressed state between the engagement projection 56 a at the other end and the groove 64 such that the spring 61 is located on the opposite side from the moving direction, as illustrated in FIG. 17 .
- the restoring force of the spring 61 biases the slide bush 56 in the direction of eccentricity of the eccentric bush 36 , and the slide bush 56 is therefore moved, thus causing the engagement projection 56 a at one end side in the direction of eccentricity to enter and engage with the engagement recess 58 b at the opening edge portion (the state illustrated in FIG. 16 ).
- the groove 64 of the slide bush 56 is located outside the receiving hole 58 .
- a fastener 66 is fitted to the groove 64 . This causes the fastener 66 to engage with the eccentric bush 36 at one end side in the axial direction of the slide bush 56 , and this engagement is not released even when the slide bush 56 moves. Further, since the fastener 66 is positioned at one end side of the spring 61 , the fastener 66 constitutes a spring holding section jointly with the engagement projection 56 a positioned on the other end side. This arrangement prevents the slide bush 56 and the spring 61 from falling off.
- the receiving hole 58 is formed passing through the eccentric bush 36
- the engagement projection 56 a is formed on the other end portion of the slide bush 56 and arranged so as to engage with the engagement recess 58 b at the opening edge portion of the receiving hole 58 in the state in which the slide bush 56 has been moved by the biasing force of the spring 61
- the fastener 66 for preventing the slide bush 56 and the spring 61 from falling off is installed at one end portion of the slide bush 56 such that the fastener 66 is positioned outside the receiving hole 58 .
- the engagement projection 56 a is required to be formed only on the other end portion of the slide bush, and the fastener 66 can be attached to one end portion of the slide bush 56 after the spring 61 is inserted in the receiving hole 58 between the eccentric bush 36 and the slide bush 56 .
- the assembly work becomes easier.
- the present invention has been applied to the so-called single-plate type compressor-integrated scroll expander taken as an example of the scroll fluid machine; however, the inventions of claim 1 to claim 5 are not limited thereto.
- the present invention is effective also for a scroll fluid machine or the like in which an expansion section and a compression section are connected by a drive shaft.
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Abstract
Scroll fluid machine (1) in which the dislodgement of a slide bush (56) and a spring (61), which are provided in an eccentric bush (36), is prevented. Provided in receiving hole (58) of eccentric bush (36) are slide bush (56), which is movable in the direction of eccentricity, and spring (61), which biases slide bush (56) in a moving direction. A spring holding section (56 b) and engagement projections (56 a) are formed on slide bush (56). After slide bush (56) is placed in the receiving hole (58), engagement projections (56 a) engage with eccentric bush (36) in a state in which slide bush (56) has been moved by the biasing force of spring (61), thus preventing slide bush (56) from falling off the receiving hole (58), and the spring holding section (56 b) prevents the spring (61) from falling off the receiving hole (58).
Description
- The present invention relates to a scroll fluid machine in which a working chamber of a working fluid is formed between the wraps of a fixed scroll and a movable scroll.
- As this type of scroll fluid machine, there has been known a single-plate type compressor-integrated expander, which includes a scroll unit composed of a movable scroll provided with a wrap provided on a base surface thereof, and a fixed scroll provided with a wrap on a base surface thereof that meshes with the wrap of the movable scroll, and in which a working chamber of the scroll unit is divided into a compression chamber and an expansion chamber by a partition, thereby forming a compression section and an expansion section (refer to, for example, Patent Document 1).
- In such a scroll fluid machine, it is required to maintain an extremely small clearance between the wraps of the fixed scroll and the movable scroll, or to bring the wraps into mutual contact in an operation. If, therefore, the cores of the scrolls are misaligned due to poor component accuracy or assembly accuracy of the scrolls, a gap will occur between the wraps, resulting in significantly deteriorated performance. To avoid the problem, a structure has been developed, in which a slide bush is provided in an eccentric bush fitted in a boss of the movable scroll, the slide bush being movable in a direction of eccentricity and biased by a spring so as to prevent the misalignment of the scrolls (refer to, for example, Patent Document 2).
- Patent Document 1: Publication of Japanese Patent No. 5209764
- Patent Document 2: Publication of Japanese Patent No. 3687279
- However, the eccentric bush is slidable and rotatable with respect to a fixed shaft and the movable scroll, thus posing a problem in that the slide bush or the spring provided in the eccentric bush comes off during an operation.
- The present invention has been made to solve the technological problem with the prior art described above, and an object of the invention is to provide a scroll fluid machine in which the dislodgement of a slide bush and a spring biasing the slide bush, which are provided in an eccentric bush to correct misalignment, is prevented by a simple structure.
- To solve the problem described above, a scroll fluid machine according to the present invention includes: a scroll unit which is composed of a fixed scroll and a movable scroll each having spiral wraps formed on base surfaces of base plates thereof, the spiral wraps opposing each other, and in which a working chamber of a working fluid is formed between the wraps of the fixed scroll and the movable scroll by an orbital motion of the movable scroll about an axis of the fixed scroll; a frame having a pedestal which orbitably supports the movable scroll at an outer peripheral portion of a rear surface on the opposite side from the base surface of the movable scroll; and a support mechanism which orbitably supports the movable scroll at a central portion of the rear surface of the movable scroll, wherein the support mechanism includes: a boss provided on the rear surface of the movable scroll; an eccentric bush slidably and rotatably fitted in the boss; a slide bush placed in a receiving hole formed in the eccentric bush such that the slide bush is movable in the direction of eccentricity of the eccentric bush; a fixed shaft which is provided protruding from a bottom surface of the frame and which is slidably and rotatably inserted in an insertion hole formed in the slide bush; and a spring which is interposed between the slide bush in the receiving hole and the eccentric bush and which biases the slide bush in a direction in which the slide bush moves, a spring holding section and engagement projection which protrudes outward are formed on the slide bush, and the engagement projection engages with the eccentric bush in a state in which the slide bush has been placed in the receiving hole and then moved by a biasing force of the spring, thereby preventing the slide bush from falling off the receiving hole, and the spring holding section prevents the spring from falling off the receiving hole.
- The scroll fluid machine according to the invention of
claim 2 is characterized in that the receiving hole is formed passing through the eccentric bush, the engagement projections are formed on both end portions of the slide bush, and the engagement projections engage with both opening edge portions of the receiving hole of the eccentric bush in a state in which the slide bush has been moved by the biasing force of the spring in the foregoing invention. - The scroll fluid machine according to the invention of
claim 3 is characterized in that the receiving hole is composed of a large-diameter section formed passing through the eccentric bush and a small-diameter section continuing from the large-diameter section in the direction of eccentricity, the engagement projections are formed on peripheral edges at both ends of the slide bush, and in a state in which the slide bush has been placed in the large-diameter section of the receiving hole and then the slide bush has been moved into the small-diameter section by the biasing force of the spring, the portions of the engagement projections positioned in the direction of the movement engage with both opening edge portions of the small-diameter section of the receiving hole, and the portions of the engagement projections positioned on the opposite side from the direction of the movement double as the spring holding section in the foregoing inventions. - The scroll fluid machine according to the invention of
claim 4 is characterized in that the receiving hole is formed passing through the eccentric bush, the engagement projections are formed on the other end portion of the slide bush and engage with an opening edge portion of the receiving hole in a state in which the slide bush has been moved by the biasing force of the spring, and one end portion of the slide bush is provided with a fastener for preventing the slide bush and the spring from falling off, the fastener being positioned outside the receiving hole, in the invention of claim 1. - The scroll fluid machine according to the invention of claim 5 is characterized in that the spring holding section has a sloping surface that inclines downward toward an opening direction of the receiving hole in the foregoing inventions.
- The scroll fluid machine according to the invention of
claim 6 is characterized in that the scroll unit is composed of an expansion section which expands a working fluid in an expansion chamber formed between the wraps of the fixed scroll and the movable scroll thereby to orbit the movable scroll to recover motive power and a compression section which compresses the working fluid by the motive power, which has been recovered by the expansion section, in a compression chamber formed between the wraps of the both scrolls in the foregoing inventions. - The scroll fluid machine according to the invention of
claim 7 is characterized in that carbon dioxide is used as the working fluid in the foregoing inventions. - The scroll fluid machine according to the present invention includes: a scroll unit which is composed of a fixed scroll and a movable scroll each having spiral wraps on base surfaces of base plates thereof, the spiral wraps being formed to oppose each other, and in which a working chamber of a working fluid is formed between the wraps of the fixed scroll and the movable scroll by an orbital motion of the movable scroll about an axis of the fixed scroll; a frame having a pedestal which orbitably supports the movable scroll at an outer peripheral portion of a rear surface on the opposite side from the base surface of the movable scroll; and a support mechanism which orbitably supports the movable scroll at a central portion of the rear surface of the movable scroll, wherein the support mechanism includes: a boss provided on the rear surface of the movable scroll; an eccentric bush slidably and rotatably fitted in the boss; a slide bush placed in a receiving hole formed in the eccentric bush such that the slide bush is movable in the direction of eccentricity of the eccentric bush; a fixed shaft which is provided protruding from a bottom surface of the frame and which is slidably and rotatably inserted in an insertion hole formed in the slide bush; and a spring which is interposed between the slide bush in the receiving hole and the eccentric bush and which biases the slide bush in a direction in which the slide bush moves, a spring holding section and engagement projection which protrudes outward are formed on the slide bush, and the engagement projection engages with the eccentric bush in a state in which the slide bush has been placed in the receiving hole and then the slide bush has been moved by a biasing force of the spring, thereby preventing the slide bush from falling off the receiving hole, and the spring holding section prevents the spring from falling off the receiving hole. This arrangement makes it possible to eliminate the misalignment of the scrolls by the slide bush being moved in the direction of eccentricity by the biasing force of the spring.
- At this time, the spring is retained by the spring holding section formed on the slide bush, and the engagement projections also formed on the slide bush engage with the eccentric bush by the biasing force of the spring, thus preventing the slide bush from falling off. This means that it is possible to prevent the slide bush and the spring from falling off the eccentric bush by the simple machining, thus enabling the production cost to be reduced.
- In this case, as in the invention of
claim 2, forming the receiving hole passing through the eccentric bush, and forming the engagement projections on both end portions of the slide bush and arranging the engagement projections such that the engagement projections engage with both opening edge portions of the receiving hole of the eccentric bush in a state in which the slide bush has been moved by the biasing force of the spring make it possible to further reliably prevent the slide bush from falling off the receiving hole of the eccentric bush by the engagement of the engagement projections at both ends. - Further, the configuration according to the invention of
claim 3 can also make it possible to stably retain the slide bush and the spring in the receiving hole of the eccentric bush so as to prevent the slide bush and the spring from falling off. More specifically, in the configuration, the receiving hole is composed of a large-diameter section formed passing through the eccentric bush and a small-diameter section continuing from the large-diameter section in the direction of eccentricity, the engagement projections are formed on the peripheral edges at both ends of the slide bush, and in a state in which the slide bush has been placed in the large-diameter section of the receiving hole and then moved into the small-diameter section by the biasing force of the spring, the portions of the engagement projections positioned in the direction of the movement engage with both opening edge portions of the small-diameter section of the receiving hole, and the portions of the engagement projections positioned on the opposite side from the direction of the movement double as the spring holding section. - Further, as in the invention of
claim 4, the receiving hole may be formed passing through the eccentric bush, the engagement projection may be formed on the other end portion of the slide bush and engaged with an opening edge portion of the receiving hole in a state in which the slide bush has been moved by the biasing force of the spring, and one end portion of the slide bush may be provided with a fastener positioned outside the receiving hole to prevent the slide bush and the spring from falling off, the fastener being positioned outside the receiving hole. In this case, the engagement projection is required to be formed only on the other end portion of the slide bush, and the fastener is attached to one end portion of the slide bush after the spring is inserted into the receiving hole between the eccentric bush and the slide bush, thus advantageously facilitating the assembly work. - Further, as in the invention of claim 5, providing the spring holding section with a sloping surface that inclines downward toward an opening direction of the receiving hole enables the spring to be inserted into the receiving hole between the eccentric bush and the slide bush by using the sloping surface. This arrangement makes the spring installation work extremely easy.
- Further, in the single-plate type scroll fluid machine, which integrates the expansion section and the compression section, as in the invention of
claim 6, the foregoing inventions are especially effective in the case where carbon dioxide is used as a working fluid, as inclaim 7. -
FIG. 1 is a longitudinal side view of a scroll fluid machine according to an embodiment to which the present invention has been applied; -
FIG. 2 is a top plan view of a fixed scroll in FIG. 1, which is observed from a base surface side; -
FIG. 3 is a sectional view taken on line A-A inFIG. 2 ; -
FIG. 4 is an enlarged view of a support mechanism illustrated inFIG. 1 ; -
FIG. 5 is a perspective view of an eccentric bush to which a slide bush illustrated inFIG. 1 has been attached (a first embodiment); -
FIG. 6 is a top plan view of the eccentric bush illustrated inFIG. 5 ; -
FIG. 7 is a sectional view taken on line B-B inFIG. 6 ; -
FIG. 8 is a sectional view taken on line C-C inFIG. 7 ; -
FIG. 9 is a refrigerant circuit diagram of a refrigerating cycle of the embodiment using the scroll fluid machine illustrated inFIG. 1 ; -
FIG. 10 is a top plan view of an eccentric bush to which a slide bush according to another embodiment of the present invention has been attached (a second embodiment); -
FIG. 11 is a sectional view taken on line D-D inFIG. 10 ; -
FIG. 12 is a top plan view of an eccentric bush to which a slide bush according to a further embodiment of the present invention has been attached (a third embodiment); -
FIG. 13 is a sectional view taken on line E-E inFIG. 12 ; -
FIG. 14 is a perspective view of an eccentric bush to which a slide bush according to yet another embodiment of the present invention has been attached (a fourth embodiment); -
FIG. 15 is a top plan view of the eccentric bush illustrated inFIG. 14 ; -
FIG. 16 is a sectional view taken on line F-F inFIG. 15 ; and -
FIG. 17 is a sectional view taken on line G-G inFIG. 16 . - The following will describe the embodiments of the present invention in detail.
- (1) General Structure of a Scroll Fluid Machine 1
-
FIG. 1 is a longitudinal side view of a scroll fluid machine 1 according to an embodiment. The scroll fluid machine 1 according to the embodiment is, for example, a vertical single-plate type compressor-integrated expander, and used in a refrigerating cycle RC (refer toFIG. 9 ) of a heat pump or the like that uses carbon dioxide, which has a supercritical pressure on the high pressure side, as a refrigerant (working fluid). The refrigerating cycle RC is incorporated in an air conditioner or a heat pump type water heater (not illustrated). The configuration of the refrigerating cycle RC will be described in detail hereinafter. The scroll fluid machine 1 according to the embodiment has anexpansion section 2, which performs an expanding operation by the pressure of a refrigerant and which will be discussed hereinafter, and a compression section 3 (on a low stage side), which performs a compressing operation by the expanding operation of the expansion section 2 (FIG. 2 ). - The scroll fluid machine 1 includes a
housing 4. Provided in thehousing 4 are ascroll unit 8 composed primarily of afixed scroll 6 and amovable scroll 7 which is orbited with respect to thefixed scroll 6, a main frame (frame) 9 which orbitably supports themovable scroll 7, and afixed shaft 11 which is fixed to the bottom surface of themain frame 9 and which is provided protruding from the bottom surface of themain frame 9. - The
housing 4 is composed of amain shell 12, which is the main body, a cap-shapedtop shell 13, which covers the top of themain shell 12, and a cap-shaped bottom shell 14 which covers the bottom of themain shell 12. Thehousing 4 is assembled by fastening thetop shell 13 and thebottom shell 14 to each other by bolts, sandwiching themain shell 12 through a sealing material, such as an O-ring, and the interior of thehousing 4 is hermetically sealed against the exterior. Further, the outer peripheral portion of themain frame 9 is fixed to the inner side of themain shell 12. Acting inside the hermetically sealedhousing 4 is a pressure obtained by compressing a refrigerant (carbon dioxide), which has been taken in from the refrigerating cycle RC as the working fluid of the scroll fluid machine 1, by thecompression section 3. - An expansion-
side suction pipe 16 through which the refrigerant taken in from the refrigerating cycle RC is supplied to theexpansion section 2 is connected to thetop shell 13. Connected to themain shell 12 are an expansion-side discharge pipe 17 through which the refrigerant expanded by theexpansion section 2 is discharged toward the refrigerating cycle RC, and a compression-side discharge pipe 18 through which the refrigerant compressed by thecompression section 3 is discharged toward the refrigerating cycle RC. The ends of the expansion-side suction pipe 16 and the expansion-side discharge pipe 17 are opened to and in communication with an expansion-side suction chamber 19 and an expansion-side discharge chamber 21, respectively, which are formed in abase plate 6 a of the fixedscroll 6. The end of the compression-side discharge pipe 18 is opened into themain shell 12 and in communication with a compression-side discharge chamber 22, which is formed inside thetop shell 13, through the interior of themain shell 12. - Further, a compression-side suction pipe 23 (illustrated in
FIG. 3 , and positioned on the front side inFIG. 1 ), through which the refrigerant taken in from the refrigerating cycle RC is supplied to thecompression section 3, is connected to themain shell 12. The end of the compression-side suction pipe 23 is opened to and in communication with a compression-side suction chamber 24 formed in thebase plate 6 a of the fixedscroll 6. - Meanwhile, a
lubricant chamber 26 is formed inside thebottom shell 14, and a lubricant for lubricating thescroll unit 8 is reserved in thelubricant chamber 26. An oil feed hole 27 (FIG. 2 ), which passes through thebase plate 6 a of the fixedscroll 6 and themain frame 9, is opened in the compression-side suction chamber 23 described above. The lubricant in thelubricant chamber 26 is fed to the compression-side suction chamber 24 through theoil feed hole 27. - Further, an
oil supply passage 28 is drilled in the fixedshaft 11 along the axial direction of the fixedshaft 11. The lower end of theoil supply passage 28 is opened to thelubricant chamber 26, while the upper end is opened to the space in a boss (recess) 31, which will be discussed hereinafter. - The fixed
scroll 6 is fixed to anupper surface 9 a of themain frame 9. A compression-side discharge hole 32, which will be discussed hereinafter, is formed passing through slightly closer to the center in the radial direction of the fixedscroll 6 than the foregoing compression-side suction chamber 24 of thebase plate 6 a of the fixedscroll 6. Anoil separator 33, which separates the lubricant in the refrigerant, is attached to the opening of the compression-side discharge hole 32 relative to the compression-side discharge chamber 22. - The
movable scroll 7 is supported by apedestal 9 b of themain frame 9 such that themovable scroll 7 is enabled to perform an orbital motion without rotating via ananti-rotation mechanism 34, such as an Oldham ring. Theanti-rotation mechanism 34 is fitted in thepedestal 9 b and slidably passed through to arear surface 7 c, which is a surface on the opposite side from abase surface 7 b of abase plate 7 a, as themovable scroll 7 performs the orbital motion. Further, the foregoingcylindrical boss 31, in which aneccentric bush 36 to be discussed hereinafter is slidably and rotatably fitted by insertion, is protrusively provided on therear surface 7 c of themovable scroll 7. - The
scroll unit 8 according to the embodiment is a so-called single-plate type scroll unit, in which both thecompression section 3 and theexpansion section 2 can be formed as the working chambers of a refrigerant by a pair of the fixedscroll 6 and themovable scroll 7 in the compressor-integrated expander. The fixedshaft 11 simply orbitably supports themovable scroll 7 together with themain frame 9, and the fixedshaft 11 itself is not rotatively driven. - More specifically, as illustrated in
FIG. 2 , an annular intermediate partition (annular wall) 38 and an annularouter partition 39 are provided in a standing manner on abase surface 6 b of the fixedscroll 6. A spiral outer fixed scroll wrap (wrap) 40 is provided in a standing manner between theintermediate partition 38 and theouter partition 39, and a spiral inner fixed scroll wrap (wrap) 41 is provided in a standing manner at a position closer to the center than theintermediate partition 38 is. Further, in thebase surface 6 b, anannular groove 42, in which a seal ring (not illustrated) is fitted by insertion, is concavely provided in the edge surface of theintermediate partition 38. - In the
base plate 6 a of the fixedscroll 6, the foregoing compression-side suction chamber 24 is formed on the outer circumferential end of thecompression section 3 slightly toward the inner side of theouter partition 39, and the compression-side discharge hole 32 is formed on the inner circumferential end of thecompression section 3 slightly toward the outer side of theintermediate partition 38. In addition, in thebase plate 6 a, the foregoing expansion-side discharge chamber 21 is formed on the outer circumferential end of theexpansion section 2 slightly toward the inner side of theintermediate partition 38, and the foregoing expansion-side suction chamber 19 is formed at the central portion, which is the inner circumferential end of theexpansion section 2. Further, in thebase plate 6 a, anannular oil groove 43 is formed slightly toward the outer side of theouter partition 39, and the foregoingoil feed hole 27 is formed in the bottom surface of a recess formed by spot facing to a predetermined depth and to a diameter that is larger than the width of the groove provided over theoil groove 43. - Meanwhile, on the
base surface 7 b of themovable scroll 7, a spiral outer movable scroll wrap (wrap) 44, which meshes with the outer fixedscroll wrap 40, and a spiral inner movable scroll wrap (wrap) 46, which meshes with the inner fixedscroll wrap 41, are provided in a standing manner such that the spirals thereof are in opposite directions from each other. - According to the
scroll unit 8 described above, theexpansion section 2 is formed on the inner side with respect to theintermediate partition 38, and thecompression section 3 is formed between theintermediate partition 38 and theouter partition 39. More specifically, as indicated by the solid line arrow inFIG. 1 , the refrigerant taken in through the expansion-side suction pipe 16 is introduced into theexpansion section 2 via the expansion-side suction chamber 19, and expanded in the expansion chamber (working chamber), which is formed between thewraps scrolls scrolls movable scroll 7 to perform an orbital motion about the axis of the fixedscroll 6. The refrigerant subjected to the orbital motion of themovable scroll 7 passes through the expansion-side discharge chamber 21 and is discharged toward the refrigerating cycle RC outside thehousing 4 through the expansion-side discharge pipe 17. - Meanwhile, the refrigerant introduced from the compression-
side suction pipe 23 is taken into thecompression section 3 via the compression-side suction chamber 24. As the refrigerant in the foregoing expansion chamber expands, themovable scroll 7 is caused to perform an orbital motion about the axis of the fixedscroll 6 so as to compress, by thescrolls wraps movable scroll 7 proceeds, the volume of the compression chamber decreases as the compression chamber moves toward the centers of thescrolls side discharge hole 32 and the compression-side discharge chamber 22 and is discharged through the compression-side discharge pipe 18 toward the refrigerating cycle RC outside thehousing 4. - Further, during the process, the lubricant in the refrigerant discharged through the compression-
side discharge hole 32 into the compression-side discharge chamber 22 is separated from the refrigerant when the refrigerant passes through theoil separator 33, as indicated by the dashed line arrow inFIG. 1 . The lubricant separated from the refrigerant passes through anoil return passage 47 formed in themain frame 9 and is reserved in thelubricant chamber 26. - The lubricant reserved in the
lubricant chamber 26 is moved up through theoil supply passage 28 by the pressure difference between thelubricant chamber 26 and the compression-side suction chamber 24 and discharged from the upper end of the fixedshaft 11 so as to lubricate abearing 49, abearing 48 and abearing 51, which will be discussed hereinafter. The lubricant then reaches aback pressure chamber 52 formed between thepedestal 9 b of themain frame 9 and therear surface 7 c of themovable scroll 7, and reaches the compression-side suction chamber 24 through theoil feed hole 27. - (2) Refrigerating Cycle RC
-
FIG. 9 is a refrigerant circuit diagram of the refrigerating cycle RC (embodiment) using the scroll fluid machine 1 according to the present invention. In this diagram, for the sake of explanation, theexpansion section 2 and thecompression section 3 of the scroll fluid machine 1 are illustrated in a separated manner. Thecompression section 3 driven by the motive power recovered by theexpansion section 2 of the scroll fluid machine 1 constitutes a low stage side compressor (a low stage side compression section) in the refrigerating cycle RC. The foregoing compression-side discharge pipe 18 of thecompression section 3 is connected to a high stageside compression section 70 a driven by anelectric motor 70 b of a highstage side compressor 70 positioned in a rear stage of thecompression section 3. - A
gas cooler 71, which cools the refrigerant, is connected to the rear stage of thecompression section 70 a. Theexpansion section 2 and anexpansion valve 72 of the scroll fluid machine 1 are connected in parallel between the outlet of thegas cooler 71 and the inlet of anevaporator 73. The refrigerant from thegas cooler 71 is taken into the expansion-side suction chamber 19 of theexpansion section 2 through the foregoing expansion-side suction pipe 16. Further, the refrigerant is sent from theexpansion section 2 of the scroll fluid machine 1 to theevaporator 73 through the expansion-side discharge pipe 17. Then, the refrigerant from theevaporator 73 is introduced into thecompression section 3 of the scroll fluid machine 1 through the compression-side suction pipe 23. - The operation of the refrigerating cycle RC including the scroll fluid machine 1 will now be described. An intermediate pressure refrigerant (the carbon dioxide refrigerant), the pressure of which has been increased by the low stage
side compression section 3 driven by theexpansion section 2 of the scroll fluid machine 1, is sent through the compression-side discharge pipe 18 to the highstage side compressor 70, and the pressure thereof is further increased to a high pressure (supercritical) by thecompression section 70 a driven by theelectric motor 70 b. The high-pressure refrigerant is cooled by thegas cooler 71 while remaining in the supercritical state, and then a part thereof is taken into theexpansion section 2 of the scroll fluid machine 1 through the expansion-side suction pipe 16 and expanded to decrease the pressure. - The rest of the refrigerant is sent to the
expansion valve 72 whereby to be expanded to decrease the pressure. Theexpansion valve 72 is provided in order to adjust the flow rate of the refrigerant passing through theexpansion section 2 of the scroll fluid machine 1. - In the
expansion section 2, the refrigerant isentropically expands, causing themovable scroll 7 to perform the orbital motion, and the motive power is thereby recovered. Thecompression section 3 is operated as the low stage side compressor by the orbital motion of themovable scroll 7. The refrigerant expanded by theexpansion section 2 is heated by the evaporator 73 (or an object is cooled thereby), and drawn into thecompression section 3 of the scroll fluid machine 1 again through the compression-side suction pipe 23. - As described above, the
compression section 3 of the scroll fluid machine 1 carries out a part (the low stage side) of the compression process of the refrigerating cycle RC, while thecompression section 70 a of thecompressor 70 on the high stage side carries out the rest (the high stage side) of the compression process. The compression power in thecompression section 3 is provided by the recovered power in theexpansion section 2. - (3) Back Pressure of the
Movable Scroll 7 - In the
back pressure chamber 52 of the scroll fluid machine 1, mainly the sliding portions between theanti-rotation mechanism 34 and thepedestal 9 b and therear surface 7 c of themovable scroll 7 are lubricated by the lubricant. Further, the interior of thehousing 4 is maintained at the discharge pressure of thecompression section 3 discharged into the compression-side discharge chamber 22 through the compression-side discharge hole 32 as described above, so that the lubricant maintained at a pressure close to the discharge pressure of thecompression section 3 is supplied to theback pressure chamber 52 through theoil supply passage 28. Therefore, from theback pressure chamber 52, themovable scroll 7 is urged and pressed against the fixedscroll 6 under the discharge pressure of thecompression section 3. The back pressure from theback pressure chamber 52 enables the smooth orbital motion of themovable scroll 7 with respect to the fixedscroll 6. - As described above, in the scroll fluid machine 1, the
scroll unit 8 is driven by the expansion energy of the refrigerant, and the driving force of thescroll unit 8 generates the compression energy of the refrigerant. In this case, as described above, the fixedshaft 11 constitutes asupport mechanism 54 which orbitably supports themovable scroll 7 together with themain frame 9 at the central portion of therear surface 7 c. - (4) Configuration of the
Support Mechanism 54 - As specifically illustrated in
FIG. 4 , which is an enlarged sectional view of thesupport mechanism 54 of themovable scroll 7, the upper end portion of the fixedshaft 11 is inserted in aninsertion hole 57 of aslide bush 56 such that the upper end portion is made slidable and rotatable by thebearing 49. Theslide bush 56 is accommodated in a receivinghole 58, which is formed passing through acolumnar insertion section 36 a in the axial direction thereof, theinsertion section 36 a being positioned at the center of theeccentric bush 36, such that theslide bush 56 is movable in the direction of eccentricity of theeccentric bush 36. In other words, the upper end portion of the fixedshaft 11 is inserted in theeccentric bush 36 through theslide bush 56. - Further, the
insertion section 36 a of theeccentric bush 36 is slidably and rotatably fitted in theboss 31 through thebearing 48. Thebearing 48 receives a radial load applied to theeccentric bush 36 as themovable scroll 7 performs the orbital motion. Further, aflanged portion 36 b, which has a diameter that is larger than the diameter of theboss 31, is formed at the lower end of theinsertion section 36 a of theeccentric bush 36, and abearing 51 is provided between theflanged portion 36 b and themain frame 9. Further, abalance weight 59, which has an L-shaped section, is integrally formed on theflanged portion 36 b. Thebalance weight 59 is rotated in the space between themovable scroll 7 and themain frame 9 as themovable scroll 7 performs the orbital motion. - As described above, the fixed
shaft 11 orbitably supports themovable scroll 7 through the intermediary of thebearing 49, theslide bush 56, theeccentric bush 36, thebearing 48, and thebearing 51. Thesupport mechanism 54 is comprised of theboss 31, theeccentric bush 36, theslide bush 56, the fixedshaft 11, and aspring 61, which will be discussed hereinafter. - (5) Configurations of the
Eccentric Bush 36, theSlide Bush 56, and theSpring 61 - Referring now to
FIG. 5 toFIG. 8 , theeccentric bush 36, theslide bush 56, and an embodiment of thespring 61, which constitute the foregoingsupport mechanism 54 will be described in detail. The receivinghole 58 of theeccentric bush 36 is formed passing through theinsertion section 36 a positioned at the center of theeccentric bush 36, and has a section that is longer in the direction of eccentricity of theeccentric bush 36, as illustrated in the drawings. In this case, the receivinghole 58 has a pair offlat surfaces 58 a, which extend in the direction of eccentricity and oppose each other. Further, both opening end portions of the receivinghole 58 are provided withengagement recesses 58 b, which are concavely formed at one end in the direction of eccentricity. - Meanwhile, the
slide bush 56 has a substantially cylindrical shape, the receivinghole 58 described above being formed passing through the center of theslide bush 56. Thebearing 49 is installed to the inner wall surface of the receivinghole 58. Both end portions in the axial direction of the receivinghole 58 of theslide bush 56 are provided withengagement projections 56 a, which are formed protruding outward and positioned at one end in the direction of eccentricity of theeccentric bush 36. Further, aspring holding section 56 b, which is recessed except both end portions in the axial direction, is formed on the other end. Further, both side walls of theslide bush 56 positioned in the direction of eccentricity of theeccentric bush 36 are formed of a pair offlat surfaces 56 c. - Further, the
spring 61 is composed of a leaf spring having a sectional shape illustrated inFIG. 8 , and provided in thespring holding section 56 b recessed in theslide bush 56. With thespring 61 provided in thespring holding section 56 b as described above, theslide bush 56 is installed in the receivinghole 58 formed passing through theinsertion section 36 a of theeccentric bush 36. At this time, thespring 61 is first compressed to move theslide bush 56 toward the other end in the direction of eccentricity of theeccentric bush 36 and then theslide bush 56 is inserted in the receivinghole 58. - At that time, the dimension from the outer ends of the wall at both ends of the
spring holding section 56 b of theslide bush 56 to the outer ends of theengagement projections 56 a is smaller than the dimension of the receivinghole 58 in that particular direction. Further, the dimension of each of theflat surfaces 56 c of theslide bush 56 is set such that each of theflat surfaces 56 c comes in slidable contact with the inner side of each of theflat surfaces 58 a of the receivinghole 58. Thespring 61 is interposed between theslide bush 56 and theeccentric bush 36 in the receivinghole 58. With this arrangement, theslide bush 56 is inserted in the receivinghole 58 such that theslide bush 56 is movable in the direction of eccentricity of theeccentric bush 36. - After the
slide bush 56 is placed in the receivinghole 58, when thespring 61, which has been compressed, is released, the restoring force of thespring 61 biases theslide bush 56 in the direction of eccentricity of theeccentric bush 36, causing theslide bush 56 to move in the direction of eccentricity. This in turn causes bothengagement projections 56 a on one end in the direction of eccentricity to move into both engagement recesses 58 b at the opening edge portions of the receivinghole 58 of theeccentric bush 36 to engage with each other (the state illustrated inFIG. 7 ). - In this state, the
slide bush 56 is placed in the receivinghole 58 of theeccentric bush 36 such that theslide bush 56 is movable in the direction of eccentricity of theeccentric bush 36, and theslide bush 56 is constantly biased in the direction of eccentricity of theeccentric bush 36 by thespring 61. Further, the engagement between bothengagement projections 56 a of theslide bush 56 and the engagement recesses 58 b of the receivinghole 58 prevents theslide bush 56 from falling off theeccentric bush 36. In addition, thespring 61 is positioned in thespring holding section 56 b of theslide bush 56 and pressed against theeccentric bush 36, thus also preventing thespring 61 from falling off theeccentric bush 36. - Further, the upper end of the fixed
shaft 11 is inserted in thebearing 49 on the inner side of theinsertion hole 57 of theslide bush 56 installed to theeccentric bush 36 as described above, thus making the upper end of the fixedshaft 11 slidable and rotatable with respect to theinsertion hole 57 of theslide bush 56. Reference character X1 inFIG. 2 denotes the axial center of the fixedscroll 6 and the fixed shaft 11 (the slide bush 56), and L1 inFIG. 6 denotes a line passing through the axial center X1. Reference character L2 inFIG. 6 denotes a line passing through the axial center of themovable scroll 7 and theeccentric bush 36. The difference between L1 and L2 indicates the amount of eccentricity of themovable scroll 7 with respect to the fixed scroll 6 (the same will apply to the following embodiments). - As the
slide bush 56 moves in the direction of eccentricity of theeccentric bush 36 while being biased by thespring 61, thereby adjusting the amount of eccentricity of themovable scroll 7 with respect to the fixedscroll 6 and the fixedshaft 11 so as to eliminate the misalignment of themovable scroll 7 with respect to the fixedscroll 6. The dimensional relationship between theengagement projections 56 a and the engagement recesses 58 b is set such that the engagement therebetween is not released even when theslide bush 56 moves during an operation (the same will apply in the following embodiments). - As described above, the
support mechanism 54 for orbitably supporting themovable scroll 7 is comprised of theboss 31 provided on the rear surface of themovable scroll 7, theeccentric bush 36 slidably and rotatably fitted in theboss 31, theslide bush 56 placed in the receivinghole 58, which is formed in theeccentric bush 36, such that theslide bush 56 is movable in the direction of eccentricity of theeccentric bush 36, the fixedshaft 11, which is provided protruding from the bottom surface of theframe 9 and which is slidably and rotatably inserted in theinsertion hole 57 formed in theslide bush 56, and thespring 61, which is interposed between theslide bush 56 in the receivinghole 58 and theeccentric bush 36 and which biases theslide bush 56 in the direction in which theslide bush 56 moves. Theslide bush 56 has thespring holding section 56 b and theengagement projections 56 a, which protrude outward. In the state in which theslide bush 56 has been placed in the receivinghole 58 and then theslide bush 56 has been moved by the biasing force of thespring 61, theengagement projections 56 a engage with the engagement recesses 58 b of the receivinghole 58 of theeccentric bush 36 thereby to prevent theslide bush 56 from falling off the receivinghole 58 and thespring holding section 56 b prevents thespring 61 from falling off the receivinghole 58. Thus, the misalignment of thescrolls slide bush 56 in the direction of eccentricity by the biasing force of thespring 61. - At this time, the
spring 61 is retained by thespring holding section 56 b formed on theslide bush 56, and theengagement projections 56 a formed also on theslide bush 56 engage with the engagement recesses 58 b formed in the receivinghole 58 of theeccentric bush 36 by the biasing force of thespring 61, thereby preventing theslide bush 56 from falling off. In other words, the simple machining, namely, forming thespring holding section 56 b in a recessed shape in theslide bush 56 and protrusively providing theengagement projections 56 a, makes it possible to prevent theslide bush 56 and thespring 61 from falling off theeccentric bush 36, thus permitting a reduction in production cost. - In particular, according to the present embodiment, the receiving
hole 58 is formed passing through theinsertion section 36 a of theeccentric bush 36, and theengagement projections 56 a are formed on both end portions of theslide bush 56, so that theengagement projections 56 a engage with the engagement recesses 58 b formed on both opening edge portions of the receivinghole 58 of theeccentric bush 36 in the state in which theslide bush 56 has been moved by the biasing force of thespring 61. The engagement of theengagement projections 56 a at both ends makes it possible to further reliably prevent theslide bush 56 from falling off the receivinghole 58 of theeccentric bush 36. - (6) Another Embodiment of the
Slide Bush 56 - Referring now to
FIG. 10 andFIG. 11 , another embodiment of theslide bush 56 will be described. The shapes of aneccentric bush 36 and aspring 61 are the same as those in the first embodiment (FIG. 5 toFIG. 8 ). Aslide bush 56 in this case has a slopingsurface 62, which inclines downward in the direction of the opening of a receivinghole 58 and which is formed on the wall at one end portion in the axial direction (denoted byreference numeral 56 d inFIG. 10 andFIG. 11 ) that constitutes aspring holding section 56 b. - Further, the
wall 56 d is formed to have a low height such that thewall 56 d is shaped like an arrowhead pointing in the direction of the opening of the receivinghole 58. The rest of the configuration is the same as the configuration of the first embodiment described above. When installing thespring 61 in thespring holding section 56 b, the slopingsurface 62 formed as described above enables thespring 61 to be pushed into the receivinghole 58 between theslide bush 56 and theeccentric bush 36 by making use of the slopingsurface 62. - In other words, according to the present embodiment, the
spring 61 can be inserted into the receivinghole 58 between theeccentric bush 36 and theslide bush 56 by making use of the slopingsurface 62 of thewall 56 d after theslide bush 56 is placed in the receivinghole 58 of theeccentric bush 36. The insertedspring 61 engages with the vertical wall surface on the opposite side from the slopingsurface 62 of thewall 56 d, thus preventing thespring 61 from falling off. Therefore, theslide bush 56 and thespring 61 can be assembled with great ease, as compared with the case where theslide bush 56 is placed in the receivinghole 58, with thespring 61 provided in thespring holding section 56 b, as in the foregoing embodiment. - (7) Further embodiments of the
eccentric bush 36, theslide bush 56, and thespring 61 - Referring now to
FIG. 12 andFIG. 13 , further embodiments of theeccentric bush 36, theslide bush 56, and thespring 61 will be described. In this case, aspring 61 is formed to have a circularly deformed tubular shape, as illustrated inFIG. 12 . In this case also, a receivinghole 58 of aneccentric bush 36 is formed passing through in the axial direction of aninsertion section 36 a. According to the present embodiment, however, the receivinghole 58 is comprised of a large-diameter section 63 a, which is a circular hole having a large inside diameter, and a small-diameter section 63 b, which is a circular hole having an inside diameter that is smaller than the inside diameter of the large-diameter section 63 a. The small-diameter section 63 b continues to the large-diameter section 63 a in the direction of eccentricity of the eccentric bush 36 (the direction in which aslide bush 56 moves). Further, engagement recesses 58 b are concavely formed in the portions corresponding to both opening edge portions of the small-diameter section 63 b. - Meanwhile, the
slide bush 56 has a cylindrical shape, andengagement projections 56 a are formed on the peripheral edges at both ends in the axial direction of theslide bush 56, theengagement projections 56 a being in a flange shape projecting outward. The outside diameter of theslide bush 56 is smaller than the inside diameter of the small-diameter section 63 b of the receivinghole 58. The outside diameters of theengagement projections 56 a are sufficiently smaller than the inside diameter of the large-diameter section 63 a of the receivinghole 58 and larger than the inside diameter of the small-diameter section 63 b. Further, the inside diameters of the engagement recesses 58 b are set to be larger than the outside diameter of theengagement projections 56 a. The rest of the configuration is the same as the configurations of the embodiments described above. - Further, a
spring 61 is provided in a compressed state between theengagement projections 56 a at both ends such that thespring 61 is located on the opposite side from the small-diameter section 63 b (opposite side from the moving direction), as illustrated inFIG. 13 . With thespring 61 compressed between theengagement projections 56 a at both ends, theslide bush 56 is inserted into the large-diameter section 63 a of the receivinghole 58. - At this time, the outside diameters of the
engagement projections 56 a of theslide bush 56 are sufficiently smaller than the inside diameter of the large-diameter section 63 a of the receivinghole 58, thus enabling theslide bush 56 to be smoothly inserted into the large-diameter section 63 a. - When the
spring 61 is inserted after theslide bush 56 is placed in the receivinghole 58 as described above, thespring 61 biases, by the restoring force thereof, theslide bush 56 in the direction of eccentricity of theeccentric bush 36, thus causing theslide bush 56 to move into the small-diameter section 63 b. This in turn causes bothengagement projections 56 a at one end in the direction of eccentricity to enter into both engagement recesses 58 b at the opening edge portion of the small-diameter section 63 b to engage with each other (the state illustrated inFIG. 12 andFIG. 13 ). - In this state, the
slide bush 56 is placed in the receivinghole 58 of theeccentric bush 36 such that theslide bush 56 is movable in the direction of eccentricity of theeccentric bush 36, and theslide bush 56 will be constantly biased in the direction of eccentricity of theeccentric bush 36 by thespring 61. Further, bothengagement projections 56 a of theslide bush 56 engage in the engagement recesses 58 b of the small-diameter section 63 b, thus preventing theslide bush 56 from falling off theeccentric bush 36. Further, thespring 61 is positioned between theengagement projections 56 a on the opposite side from the small-diameter section 63 b of theslide bush 56 and pressed relative to theeccentric bush 36, thus also preventing thespring 61 from falling off theeccentric bush 36. - As described above, according to the third embodiment, the receiving
hole 58 is composed of the large-diameter section 63 a formed passing through theeccentric bush 36, and the small-diameter section 63 b, which continues to the large-diameter section 63 a in the direction of eccentricity, and theengagement projections 56 a are formed on the peripheral edges at both ends of theslide bush 56. After theslide bush 56 is placed in the large-diameter section 63 a of the receivinghole 58 and theslide bush 56 is moved in the small-diameter section 63 b by the biasing force of thespring 61, the portions of theengagement projections 56 a positioned in the direction of the movement engage with the engagement recesses 58 b formed in both opening edge portions of the small-diameter section 63 b of the receivinghole 58, and the portions of theengagement projections 56 a positioned on the opposite side from the direction of the movement double as a spring holding section that retains thespring 61. This arrangement enables theslide bush 56 and thespring 61 to be stably retained in the receivinghole 58 of theeccentric bush 36, thus preventing theslide bush 56 and thespring 61 from falling off. In addition, theslide bush 56 is cylindrical, thus leading to a reduction in machining cost. - (8) Further Additional Embodiments of the
Eccentric Bush 36, theSlide Bush 56, and theSpring 61 - Referring now to
FIG. 14 toFIG. 17 , further additional embodiments of theeccentric bush 36, theslide bush 56, and thespring 61 will be described. In the present embodiments, anelliptical receiving hole 58 having the same diameter as that of the small-diameter section 63 b of the third embodiment illustrated inFIG. 12 andFIG. 13 is formed in aninsertion section 36 a of aneccentric bush 36. Theelliptical receiving hole 58 is longer in the direction of eccentricity of theeccentric bush 36. Further, theengagement projection 56 a around one end portion in the axial direction of theslide bush 56 has been eliminated. Instead, one end portion of theslide bush 56 in the axial direction protrudes out of a receivinghole 58, as illustrated inFIG. 16 . Further, agroove 64 is concavely formed around the protruding portion. A C-shaped fastener (clip) 66 illustrated inFIG. 14 andFIG. 15 is fitted in thegroove 64. Further, theengagement recess 58 b at one end in the axial direction of the receivinghole 58 of theeccentric bush 36 is not provided. The rest of the configuration is the same as the configurations of the embodiments described above. - Further, in the case of the present embodiment, the
slide bush 56 is first inserted in the receivinghole 58 from the other end side of the receivinghole 58 without installing aspring 61. After that, thespring 61 is inserted from one end side in the axial direction in a compressed state between theengagement projection 56 a at the other end and thegroove 64 such that thespring 61 is located on the opposite side from the moving direction, as illustrated inFIG. 17 . After thespring 61 is inserted, the restoring force of thespring 61 biases theslide bush 56 in the direction of eccentricity of theeccentric bush 36, and theslide bush 56 is therefore moved, thus causing theengagement projection 56 a at one end side in the direction of eccentricity to enter and engage with theengagement recess 58 b at the opening edge portion (the state illustrated inFIG. 16 ). - In the state in which the
spring 61 has been inserted as described above, thegroove 64 of theslide bush 56 is located outside the receivinghole 58. In this state, afastener 66 is fitted to thegroove 64. This causes thefastener 66 to engage with theeccentric bush 36 at one end side in the axial direction of theslide bush 56, and this engagement is not released even when theslide bush 56 moves. Further, since thefastener 66 is positioned at one end side of thespring 61, thefastener 66 constitutes a spring holding section jointly with theengagement projection 56 a positioned on the other end side. This arrangement prevents theslide bush 56 and thespring 61 from falling off. - As described above, the receiving
hole 58 is formed passing through theeccentric bush 36, theengagement projection 56 a is formed on the other end portion of theslide bush 56 and arranged so as to engage with theengagement recess 58 b at the opening edge portion of the receivinghole 58 in the state in which theslide bush 56 has been moved by the biasing force of thespring 61, and thefastener 66 for preventing theslide bush 56 and thespring 61 from falling off is installed at one end portion of theslide bush 56 such that thefastener 66 is positioned outside the receivinghole 58. Therefore, theengagement projection 56 a is required to be formed only on the other end portion of the slide bush, and thefastener 66 can be attached to one end portion of theslide bush 56 after thespring 61 is inserted in the receivinghole 58 between theeccentric bush 36 and theslide bush 56. Thus, the assembly work becomes easier. - In the embodiments, the present invention has been applied to the so-called single-plate type compressor-integrated scroll expander taken as an example of the scroll fluid machine; however, the inventions of claim 1 to claim 5 are not limited thereto. The present invention is effective also for a scroll fluid machine or the like in which an expansion section and a compression section are connected by a drive shaft.
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- 1 Scroll fluid machine
- 2 Expansion section
- 3 Compression section (Low stage side)
- 6 Fixed scroll
- 7 Movable scroll
- 8 Scroll unit
- 9 Main frame
- 11 Fixed shaft
- 31 Boss
- 36 Eccentric bush
- 40, 41, 44, 46 Wrap
- 49 Bearing
- 54 Support mechanism
- 56 Slide bush
- 56 a Engagement projection
- 57 Insertion hole
- 58 Receiving hole
- 58 b Engagement recess
- 61 Spring
- 63 a Large-diameter section
- 63 b Small-diameter section
- 66 Fastener
- RC Refrigerating cycle
Claims (7)
1. A scroll fluid machine comprising:
a scroll unit which is composed of a fixed scroll and a movable scroll each having spiral wraps formed on base surfaces of base plates thereof, the spiral wraps opposing each other, and in which a working chamber of a working fluid is formed between the wraps of the fixed scroll and the movable scroll by an orbital motion of the movable scroll about an axis of the fixed scroll;
a frame having a pedestal which orbitably supports the movable scroll at an outer peripheral portion of a rear surface on the opposite side from the base surface of the movable scroll; and
a support mechanism which orbitably supports the movable scroll at a central portion of the rear surface of the movable scroll,
wherein the support mechanism includes:
a boss provided on the rear surface of the movable scroll;
an eccentric bush slidably and rotatably fitted in the boss;
a slide bush placed in a receiving hole formed in the eccentric bush such that the slide bush is movable in a direction of eccentricity of the eccentric bush;
a fixed shaft which is provided protruding from a bottom surface of the frame and which is slidably and rotatably inserted in an insertion hole formed in the slide bush; and
a spring which is interposed between the slide bush in the receiving hole and the eccentric bush and which biases the slide bush in a direction in which the slide bush moves,
a spring holding section and engagement projection which protrudes outward are formed on the slide bush, and
the engagement projection engages with the eccentric bush in a state in which the slide bush has been placed in the receiving hole and then moved by a biasing force of the spring, thereby preventing the slide bush from falling off the receiving hole, and the spring holding section prevents the spring from falling off the receiving hole.
2. The scroll fluid machine according to claim 1 , wherein
the receiving hole is formed passing through the eccentric bush,
the engagement projections are formed on both end portions of the slide bush and
the engagement projections engage with both opening edge portions of the receiving hole of the eccentric bush in a state in which the slide bush has been moved by the biasing force of the spring.
3. The scroll fluid machine according to claim 1 or 2 , wherein
the receiving hole is composed of a large-diameter section formed passing through the eccentric bush and a small-diameter section continuing from the large-diameter section in the direction of eccentricity,
the engagement projections are formed on peripheral edges at both ends of the slide bush, and
in a state in which the slide bush has been placed in the large-diameter section of the receiving hole and then the slide bush has been moved into the small-diameter section by the biasing force of the spring, the portions of the engagement projections positioned in the direction of the movement engage with both opening edge portions of the small-diameter section of the receiving hole, and the portions of the engagement projections positioned on the opposite side from the direction of the movement double as the spring holding section.
4. The scroll fluid machine according to claim 1 , wherein
the receiving hole is formed passing through the eccentric bush,
the engagement projection is formed on the other end portion of the slide bush and engages with an opening edge portion of the receiving hole in a state in which the slide bush has been moved by the biasing force of the spring, and
one end portion of the slide bush is provided with a fastener for preventing the slide bush and the spring from falling off, the fastener being positioned outside the receiving hole.
5. The scroll fluid machine according to claim 1 , wherein the spring holding section has a sloping surface that inclines downward toward an opening direction of the receiving hole.
6. The scroll fluid machine according to claim 1 ,
wherein the scroll unit includes:
an expansion section which expands a working fluid in an expansion chamber formed between the wraps of the fixed scroll and the movable scroll thereby to orbit the movable scroll to recover motive power; and
a compression section which compresses the working fluid by the motive power, which has been recovered by the expansion section, in a compression chamber formed between the wraps of the both scrolls.
7. The scroll fluid machine according to claim 1 , wherein carbon dioxide is used as the working fluid.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2014-173865 | 2014-08-28 | ||
JP2014173865A JP6393115B2 (en) | 2014-08-28 | 2014-08-28 | Scroll type fluid machinery |
PCT/JP2015/057797 WO2016031276A1 (en) | 2014-08-28 | 2015-03-17 | Scroll fluid machine |
Publications (1)
Publication Number | Publication Date |
---|---|
US20170268340A1 true US20170268340A1 (en) | 2017-09-21 |
Family
ID=55399183
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US15/505,435 Abandoned US20170268340A1 (en) | 2014-08-28 | 2015-03-17 | Scroll Fluid Machine |
Country Status (4)
Country | Link |
---|---|
US (1) | US20170268340A1 (en) |
JP (1) | JP6393115B2 (en) |
DE (1) | DE112015003978T5 (en) |
WO (1) | WO2016031276A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11002276B2 (en) | 2018-05-11 | 2021-05-11 | Emerson Climate Technologies, Inc. | Compressor having bushing |
US11015598B2 (en) * | 2018-04-11 | 2021-05-25 | Emerson Climate Technologies, Inc. | Compressor having bushing |
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US5378129A (en) * | 1993-12-06 | 1995-01-03 | Copeland Corporation | Elastic unloader for scroll machines |
US5496157A (en) * | 1994-12-21 | 1996-03-05 | Carrier Corporation | Reverse rotation prevention for scroll compressors |
US20020081224A1 (en) * | 2000-12-22 | 2002-06-27 | Motohiko Ueda | Scroll-type compressor |
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US20090246057A1 (en) * | 2008-03-27 | 2009-10-01 | Sanyo Electric Co.,Ltd. | Scroll compressor |
US20150322947A1 (en) * | 2012-12-14 | 2015-11-12 | Sanden Holdings Corporation | Scroll-Type Fluid Machine |
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JPS62126207A (en) * | 1985-11-27 | 1987-06-08 | Mitsubishi Electric Corp | Scroll hydraulic machine |
JP3114300B2 (en) * | 1991-12-13 | 2000-12-04 | 松下電器産業株式会社 | Scroll compressor |
JP3687279B2 (en) * | 1997-06-30 | 2005-08-24 | 松下電器産業株式会社 | Scroll compressor |
KR100590490B1 (en) * | 2003-12-16 | 2006-06-19 | 엘지전자 주식회사 | The stopper device of eccentric bush for scroll compressor |
KR20110108025A (en) * | 2010-03-26 | 2011-10-05 | 학교법인 두원학원 | Scroll compressor |
JP5209764B2 (en) * | 2010-08-04 | 2013-06-12 | サンデン株式会社 | Scroll type fluid machinery |
US9188124B2 (en) * | 2012-04-30 | 2015-11-17 | Emerson Climate Technologies, Inc. | Scroll compressor with unloader assembly |
-
2014
- 2014-08-28 JP JP2014173865A patent/JP6393115B2/en active Active
-
2015
- 2015-03-17 DE DE112015003978.3T patent/DE112015003978T5/en not_active Withdrawn
- 2015-03-17 US US15/505,435 patent/US20170268340A1/en not_active Abandoned
- 2015-03-17 WO PCT/JP2015/057797 patent/WO2016031276A1/en active Application Filing
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5378129A (en) * | 1993-12-06 | 1995-01-03 | Copeland Corporation | Elastic unloader for scroll machines |
US5496157A (en) * | 1994-12-21 | 1996-03-05 | Carrier Corporation | Reverse rotation prevention for scroll compressors |
US20020081224A1 (en) * | 2000-12-22 | 2002-06-27 | Motohiko Ueda | Scroll-type compressor |
US20060104846A1 (en) * | 2004-11-12 | 2006-05-18 | Lg Electronics Inc. | Scroll compressor |
US20090246057A1 (en) * | 2008-03-27 | 2009-10-01 | Sanyo Electric Co.,Ltd. | Scroll compressor |
US20150322947A1 (en) * | 2012-12-14 | 2015-11-12 | Sanden Holdings Corporation | Scroll-Type Fluid Machine |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11015598B2 (en) * | 2018-04-11 | 2021-05-25 | Emerson Climate Technologies, Inc. | Compressor having bushing |
US11002276B2 (en) | 2018-05-11 | 2021-05-11 | Emerson Climate Technologies, Inc. | Compressor having bushing |
Also Published As
Publication number | Publication date |
---|---|
DE112015003978T5 (en) | 2017-06-22 |
JP2016048054A (en) | 2016-04-07 |
WO2016031276A1 (en) | 2016-03-03 |
JP6393115B2 (en) | 2018-09-19 |
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Legal Events
Date | Code | Title | Description |
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AS | Assignment |
Owner name: SANDEN HOLDINGS CORPORATION, JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:OOTANI, HISASHI;MATSUMOTO, YASUOMI;TOBE, TAKAHISA;REEL/FRAME:041393/0945 Effective date: 20170207 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |