WO2014051085A1 - スクロール圧縮機 - Google Patents
スクロール圧縮機 Download PDFInfo
- Publication number
- WO2014051085A1 WO2014051085A1 PCT/JP2013/076354 JP2013076354W WO2014051085A1 WO 2014051085 A1 WO2014051085 A1 WO 2014051085A1 JP 2013076354 W JP2013076354 W JP 2013076354W WO 2014051085 A1 WO2014051085 A1 WO 2014051085A1
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- WIPO (PCT)
- Prior art keywords
- end plate
- oil
- scroll
- oil groove
- groove
- Prior art date
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Classifications
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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
- F04C29/02—Lubrication; Lubricant separation
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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
- F04C29/02—Lubrication; Lubricant separation
- F04C29/028—Means for improving or restricting lubricant flow
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C17/00—Arrangements for drive of co-operating members, e.g. for rotary piston and casing
- F01C17/06—Arrangements for drive of co-operating members, e.g. for rotary piston and casing using cranks, universal joints or similar elements
- F01C17/066—Arrangements for drive of co-operating members, e.g. for rotary piston and casing using cranks, universal joints or similar elements with an intermediate piece sliding along perpendicular axes, e.g. Oldham coupling
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
- F01C21/10—Outer members for co-operation with rotary pistons; Casings
-
- 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
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
- F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
- F04C18/0246—Details concerning the involute wraps or their base, e.g. geometry
- F04C18/0253—Details concerning the base
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/02—Lubrication; Lubricant separation
- F04C29/023—Lubricant distribution through a hollow driving shaft
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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
- F04C29/02—Lubrication; Lubricant separation
- F04C29/026—Lubricant separation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B31/00—Compressor arrangements
- F25B31/002—Lubrication
- F25B31/004—Lubrication oil recirculating arrangements
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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
- F04C23/008—Hermetic pumps
Definitions
- the present invention relates to a scroll compressor in which a back pressure space of a movable scroll communicates with a peripheral compression chamber.
- Patent Document 1 Japanese Patent Laid-Open No. 2001-214872
- a contact portion between the thrust sliding portion of the fixed scroll and the end plate of the movable scroll is lubricated.
- An oil groove to which oil is supplied from the space may be formed.
- Patent Document 1 since an oil groove is formed over the entire circumference of the fixed scroll, oil is supplied to the entire contact portion between the thrust sliding portion and the end plate of the movable scroll, and a good lubrication state is realized. .
- an intermediate pressure (intermediate between suction pressure and discharge pressure) communicated with a peripheral compression chamber on the back side of the movable scroll. Pressure) back pressure space may be formed.
- a communication hole formed in the movable scroll and a communication groove capable of communicating at a desired timing are fixed to the fixed scroll.
- a desired intermediate pressure compression chamber and a back pressure space are communicated with each other.
- the problem of the present invention is that the back pressure space is formed on the back side and the outer peripheral side of the movable scroll, and the fixed scroll is fixed when the communication groove for communicating the compression chamber and the back pressure space on the peripheral side is formed.
- An object of the present invention is to provide a highly reliable scroll compressor in which oil is supplied to the entire sliding portion of the scroll and the movable scroll.
- the scroll compressor according to the first aspect of the present invention includes a fixed scroll, a movable scroll, and a drive unit.
- the fixed scroll includes a flat plate-shaped first end plate, a spiral first wrap projecting from the front surface of the first end plate, and a thrust sliding portion surrounding the first wrap.
- the movable scroll has a flat plate-like second end plate and a spiral second wrap projecting from the front surface of the second end plate.
- the drive unit is connected to the movable scroll via a crankshaft and turns the movable scroll.
- the first wrap and the second wrap are combined so that the front surface of the first end plate and the front surface of the second end plate face each other, and a compression chamber is formed between the adjacent first and second wraps.
- the drive unit periodically rotates the movable scroll to compress the gaseous refrigerant in the compression chamber.
- a back pressure space communicating with the compression chamber on the peripheral side is formed for at least a fixed period during the revolution cycle of the movable scroll.
- a communication hole communicating with the back pressure space is formed in the second end plate.
- the thrust sliding portion opposed to the front surface of the second end plate includes a first oil groove, a communication groove, a second groove on a sliding surface in contact with the front surface of the second end plate for at least a certain period during one revolution cycle of the movable scroll. An oil groove is formed.
- the first oil groove extends in an arc shape in the first angle region with respect to the center of the first end plate in plan view, and the oil is supplied from the high-pressure space communicating with the high-pressure compression chamber to hold the oil.
- the communication groove is disposed in the second angle region outside the first angle region with respect to the center of the first end plate in plan view, and communicates with the compression chamber and communicates with the communication hole for at least a certain period.
- the second oil groove is disposed in the second angle region with respect to the center of the first end plate in plan view, and communicates with the back pressure space for at least a certain period.
- the back pressure space is constant in the vicinity of the communication groove where it is difficult to form the first oil groove of the thrust sliding portion (in the second angle region with respect to the center of the first end plate of the fixed scroll in plan view).
- a second oil groove communicating for a period is formed.
- the oil supplied to the first oil groove is supplied to the contact portion between the thrust sliding portion and the second end plate of the movable scroll.
- the oil supplied to the first oil groove is difficult to be supplied to the second angle region.
- the second oil groove communicating with the back pressure space is formed in the second angle region, the oil existing in the back pressure space is collected in the second oil groove, and the thrust sliding in the second angle region is performed. Is supplied to a contact portion between the first end plate and the second end plate. That is, oil can be supplied to the entire contact portion between the thrust sliding portion and the second end plate by the first oil groove and the second oil groove. As a result, the reliability of the scroll compressor can be increased.
- a scroll compressor includes a fixed scroll, a movable scroll, and a drive unit.
- the fixed scroll includes a flat plate-shaped first end plate, a spiral first wrap projecting from the front surface of the first end plate, and a thrust sliding portion surrounding the first wrap.
- the movable scroll has a flat plate-like second end plate and a spiral second wrap projecting from the front surface of the second end plate.
- the drive unit is connected to the movable scroll via a crankshaft and turns the movable scroll. The first wrap and the second wrap are combined so that the front surface of the first end plate and the front surface of the second end plate face each other, and a compression chamber is formed between the adjacent first and second wraps.
- the drive unit periodically rotates the movable scroll to compress the gaseous refrigerant in the compression chamber.
- a back pressure space communicating with the compression chamber on the peripheral side is formed for at least a fixed period during the revolution cycle of the movable scroll.
- a communication hole communicating with the back pressure space is formed in the second end plate.
- the fixed scroll is formed with an oil introduction path through which oil supplied from a high-pressure space communicating with the high-pressure compression chamber flows.
- the thrust sliding portion opposed to the front surface of the second end plate includes a first oil groove, a communication groove, a second groove on a sliding surface in contact with the front surface of the second end plate for at least a certain period during one revolution cycle of the movable scroll.
- the first oil groove extends in an arc shape in the first angle region with respect to the center of the first end plate in plan view, and the oil is supplied from the oil introduction path to hold the oil.
- the communication groove is disposed in the second angle region outside the first angle region with respect to the center of the first end plate in plan view, and communicates with the compression chamber and communicates with the communication hole for at least a certain period.
- the second oil groove is disposed in the second angle region with respect to the center of the first end plate in plan view, and communicates with the back pressure space for at least a certain period.
- the oil can be supplied to the entire contact portion between the thrust sliding portion and the second end plate by the first oil groove and the second oil groove. As a result, the reliability of the scroll compressor can be increased.
- a scroll compressor according to a third aspect of the present invention is the scroll compressor according to the first aspect or the second aspect, wherein the second oil groove is a radial direction with respect to the center of the first end plate in plan view. One distance extends in the circumferential direction by a second distance. The first distance is greater than or equal to the second distance.
- the second oil groove extends longer in the radial direction than in the circumferential direction in plan view, the outer edge of the movable scroll is not easily caught in the second oil groove even if the movable scroll turns. Therefore, oil can be supplied to the second angle region without adversely affecting the turning motion of the movable scroll, and a highly reliable scroll compressor can be realized.
- a scroll compressor according to a fourth aspect of the present invention is the scroll compressor according to the third aspect, and the second oil groove is circular, elliptical, rectangular, J-shaped, or It is L-shaped.
- the second oil groove for supplying oil to the second angle region can be formed by easy processing, and the reliability of the scroll compressor can be improved.
- a scroll compressor according to a fifth aspect of the present invention is the scroll compressor according to any one of the first to fourth aspects, wherein the communication groove is in a radial direction with respect to the center of the first end plate in plan view. And is formed in a J-shape that curves inward with respect to the center of the first end plate. At least one of the second oil grooves is formed in a J-shape that extends in the radial direction toward the center of the first end plate and curves outward with respect to the center of the first end plate in plan view.
- the curved portion of the communication groove and the curved portion of the J-shaped second oil groove are arranged to face each other.
- the second oil groove can be disposed close to the communication groove. Further, the second oil groove can be arranged such that the curved portion of the second oil groove surrounds the curved portion of the communication groove. Therefore, even in the vicinity of the communication groove where the oil is difficult to be retained due to the influence of the refrigerant flow (flow of refrigerant flowing from the compression chamber through the communication groove and the communication hole into the back pressure space), the second oil groove is sufficient. Oil can be supplied. As a result, the reliability of the scroll compressor can be increased.
- a scroll compressor according to a sixth aspect of the present invention is the scroll compressor according to any one of the first aspect to the fifth aspect, wherein the second oil groove includes a front surface of the second end plate of the thrust sliding portion. At least a part is formed on the always sliding surface that is always in contact.
- oil is supplied to the constantly sliding surface of the thrust sliding portion that is always in contact with the second end plate by the second oil groove. Since the constantly sliding surface is always in contact with the second end plate, lubrication is particularly necessary, and the reliability of the scroll compressor can be improved by sufficiently supplying oil to the constantly sliding surface.
- the scroll compressor which concerns on the 7th viewpoint of this invention is a scroll compressor which concerns on a 6th viewpoint, Comprising: A 1st oil groove and a communicating groove are always formed in a sliding surface.
- the communication groove is always formed on the sliding surface, the compression chamber and the back pressure space on the peripheral side are communicated directly only through the communication groove and the communication hole, and the pressure in the back pressure space is optimal. Controlled by pressure.
- oil cannot be supplied from the back pressure space to the contact portion between the thrust sliding portion and the second end plate via the communication groove.
- the pressure of the thrust sliding portion can be controlled while realizing the pressure control of the back pressure space. Oil can be supplied to the constantly sliding surface in the two-angle region. Furthermore, since the first oil groove is formed on the constantly sliding surface in the first angle region, it is easy to supply oil to the constantly sliding surface of the thrust sliding portion that particularly requires lubrication, and a highly reliable scroll compressor. Can be realized.
- a scroll compressor according to an eighth aspect of the present invention is the scroll compressor according to the first to seventh aspects, and the second oil groove is always in communication with the back pressure space.
- the second oil groove is always in communication with the back pressure space, the oil is easily reliably collected in the second oil groove, and the oil is easily supplied from the second oil groove to the second angle region. As a result, the reliability of the scroll compressor can be increased.
- the scroll compressor which concerns on the 9th viewpoint of this invention is a scroll compressor which concerns on the 8th viewpoint from the 1st viewpoint, Comprising:
- a 2nd oil groove consists of a some groove
- the second oil groove can be arranged by selecting an area where oil is difficult to be supplied. Therefore, it is easy to reliably supply oil from the second oil groove to the contact portion between the thrust sliding portion and the second end plate in the second angle region. As a result, the reliability of the scroll compressor can be increased.
- the oil supplied to the first oil groove is supplied to the contact portion between the thrust sliding portion and the second end plate of the movable scroll.
- the oil supplied to the first oil groove is difficult to be supplied to the second angle region.
- the second oil groove communicating with the back pressure space is formed in the second angle region, the oil existing in the back pressure space is collected in the second oil groove, and the thrust sliding in the second angle region is performed. Supplied to the contact portion between the first end plate and the second end plate.
- FIG. 2 is a schematic side view of a flow rate restricting member provided on a fixed scroll of the scroll compressor of FIG. 1. It is the schematic plan view which looked at the movable scroll of the scroll compressor of FIG. 1 from upper direction. It is a schematic perspective view of the Oldham coupling of the scroll compressor of FIG. In the scroll compressor of FIG.
- the scroll compressor 10 mainly includes a casing 20, a scroll compression mechanism 30, an Oldham coupling 40, a drive motor 50, a crankshaft 60, and a lower bearing 70.
- the scroll compressor 10 has a vertically long cylindrical casing 20.
- the casing 20 includes a substantially cylindrical cylindrical member 21 that is open at the top and bottom, and an upper lid 22a and a lower lid 22b that are provided at the upper end and the lower end of the cylindrical member 21, respectively.
- the cylindrical member 21, and the upper lid 22a and the lower lid 22b are fixed by welding so as to keep airtightness.
- the casing 20 accommodates the components of the scroll compressor 10 including the scroll compression mechanism 30, Oldham joint 40, drive motor 50, crankshaft 60, and lower bearing 70.
- An oil sump space 26 is formed in the lower part of the casing 20.
- oil L for lubricating the scroll compression mechanism 30 and the like is stored in the oil reservoir space 26.
- the oil sump space 26 communicates with a first space S1 described later.
- a suction pipe 23 for sucking a gas refrigerant which is a compression target of the scroll compression mechanism 30 is provided so as to penetrate the upper lid 22a.
- the lower end of the suction pipe 23 is connected to a fixed scroll 31 of a scroll compression mechanism 30 described later.
- the suction pipe 23 communicates with a compression chamber 35 of a scroll compression mechanism 30 described later.
- a low-pressure gas refrigerant before compression flows through the suction pipe 23.
- a discharge pipe 24 through which a gas refrigerant discharged to the outside of the casing 20 passes is provided at an intermediate portion of the cylindrical member 21 of the casing 20. More specifically, the discharge pipe 24 is arranged so that the end of the discharge pipe 24 inside the casing 20 protrudes into a first space S1 formed below the housing 33 of the scroll compression mechanism 30 described later. A high-pressure gas refrigerant compressed by the scroll compression mechanism 30 flows through the discharge pipe 24.
- the scroll compression mechanism 30 is mainly compressed in combination with a housing 33, a fixed scroll 31 disposed above the housing 33, and the fixed scroll 31. And a movable scroll 32 that forms a chamber 35. An eccentric space 37 and a back pressure space 36 are formed between the movable scroll 32 and the housing 33.
- the fixed scroll 31 has a disk-like fixed side end plate 311 and a spiral shape protruding from the front surface (lower surface 311a) of the fixed side end plate 311.
- the gas refrigerant compressed in the compression chamber 35 is discharged upward from the discharge port 311b, passes through a refrigerant passage (not shown) formed in the fixed scroll 31 and the housing 33 described later, and flows into the first space S1.
- the fixed side wrap 312 is formed in a spiral shape and protrudes from the lower surface 311 a of the fixed side end plate 311.
- the fixed-side wrap 312 and the movable-side wrap 322 of the movable scroll 32 described later are combined so that the lower surface 311a of the fixed-side end plate 311 and the upper surface 321a of the movable-side end plate 321 face each other.
- a compression chamber 35 is formed between the movable side wrap 322. As will be described later, the movable scroll 32 is pressed against the fixed scroll 31 by the force generated in the back pressure space 36 and the eccentric portion space 37.
- the peripheral edge 313 is formed in a thick ring shape and is arranged so as to surround the fixed side wrap 312.
- a second oil introduction path 90 communicating with a first oil introduction path 331 formed in the housing 33 described later is formed.
- the oil L supplied from the first oil introduction path 331 flows through the second oil introduction path 90.
- the oil L that has flowed through the second oil introduction path 90 is supplied to a first oil groove 313d described later.
- the second oil introduction path 90 includes a first vertical path 91, a first horizontal path 92, and a second vertical path 93.
- the first vertical passage 91 is formed so as to penetrate the peripheral edge 313 in the vertical direction (substantially vertical direction).
- the lower end of the first vertical passage 91 communicates with the upper opening of the vertical passage 331b of the first oil introduction passage 331 described later.
- a first insertion hole 91 a is formed at the upper end of the first vertical passage 91.
- An internal thread is formed in the vicinity of the opening of the first insertion hole 91a.
- a flow restricting member 95 is inserted and fixed in the first insertion hole 91a.
- a spiral passage 91 b is formed on the outer periphery by the flow restriction member 95.
- the spiral passage 91b functions as a throttle portion that adjusts the pressure of the oil L supplied to the first oil groove 313d.
- the flow restricting member 95 is a substantially rod-shaped member as shown in FIG.
- the flow restricting member 95 includes a main body 95a disposed at one end, a small diameter portion 95b provided continuously with the main body 95a, a screw portion 95c provided continuously with the main body 95a of the small diameter portion 95b, and a screw portion 95c.
- the large-diameter portion 95d is provided on the opposite side of the small-diameter portion 95b.
- a spiral groove 95aa that is continuous in a spiral shape is formed on the outer peripheral surface of the main body 95a, and is inserted into the first vertical passage 91 to form a spiral passage 91b.
- the screw portion 95c is formed with a male screw that is screwed into a female screw formed in the vicinity of the opening of the first insertion hole 91a.
- the large diameter portion 95d is formed larger than the diameter of the first insertion hole 91a, and constitutes an end portion of the flow restricting member 95 on the opposite side to the main body 95a.
- the flow restricting member 95 is inserted into the first insertion hole 91a from the main body 95a side, and the internal thread formed in the vicinity of the opening of the first insertion hole 91a and the male screw of the screw portion 95c are screwed together, whereby the flow restricting member 95 and the peripheral part 313 are fixed.
- the second vertical passage 93 is formed so as to penetrate the peripheral edge 313.
- a communication hole 313e communicating with the first oil groove 313d is formed at the lower end of the second vertical passage 93.
- the diameter of the communication hole 313e is formed smaller than the diameter of the second vertical passage 93 so as to be substantially the same as the width of the first oil groove 313d.
- a second insertion hole 93 a is formed at the upper end of the second vertical passage 93.
- An internal thread is formed in the vicinity of the opening of the second insertion hole 93a.
- a flow restricting member 95 is inserted and fixed in the second insertion hole 93a.
- a spiral passage 93 b is formed on the outer periphery by the flow restriction member 95.
- the spiral passage 93b functions as a throttle portion that adjusts the pressure of the oil L supplied to the first oil groove 313d.
- the fixing of the second insertion hole 93a and the flow restricting member 95 is the same as the fixing of the first inserting hole 91a and the flow restricting member 95, and the description thereof will be omitted.
- the first horizontal passage 92 is formed at the upper part of the peripheral edge portion 313 so as to communicate the first vertical passage 91 and the second vertical passage 93. More specifically, in the first horizontal passage 92, a portion where the small diameter portion 95b of the flow restriction member 95 of the first vertical passage 91 is arranged and a small diameter portion 95b of the flow restriction member 95 of the second vertical passage 93 are arranged. Communicate with the part to be used.
- the first horizontal passage 92 extends substantially horizontally from the outer peripheral surface of the peripheral edge portion 313, communicates with the first vertical passage 91, and further reaches the second vertical passage 93.
- the opening of the outer peripheral surface of the peripheral edge portion 313 of the first lateral passage 92 is closed by a plug 92a.
- a plurality of (two) flow restriction members 95 are provided to secure the distance between the spiral passages 91b and 93b, thereby reducing the flow passage area of the spiral passages 91b and 93b. It is possible to reduce the pressure of the high-pressure (substantially discharge pressure) oil L to an appropriate pressure while suppressing the excess. For this reason, it is possible to prevent the spiral passage 93b from being clogged with minute foreign matters and the like and blocking the second oil introduction passage 90.
- the lower surface 313a of the peripheral edge 313 is opposed to the front surface (upper surface 321a) of a movable side end plate 321 of the movable scroll 32 described later.
- the movable scroll 32 is pressed against the fixed scroll 31 by a force generated in a back pressure space 36 and an eccentric space 37 which will be described later.
- the contact portion between the lower surface 313 a of the peripheral edge 313 and the upper surface 321 a of the movable side end plate 321 is in close contact.
- the lower surface 313a of the peripheral edge portion 313 intermittently contacts the constantly sliding surface R1 that always contacts the upper surface 321a of the movable side end plate 321. It has intermittent sliding surface R2 and non-sliding surface R3 which does not contact. As shown by a one-dot broken line in FIG. 2, in a plan view, the sliding surface R1, the intermittent sliding surface R2, and the non-sliding surface R3 are always arranged in this order from the center side to the outer peripheral side of the fixed scroll 31.
- the intermittent sliding surface R2 faces a back pressure space 36 described later when not in contact with the upper surface 321a of the movable side end plate 321.
- the non-sliding surface R3 always faces the back pressure space 36.
- a first fixed scroll key groove 313b, a second fixed scroll key groove 313c, a first oil groove 313d, a second oil groove 80, and a communication groove 314 are formed on the lower surface 313a of the peripheral edge 313. Each groove will be described in detail below.
- the first and second fixed scroll key grooves 313b and 313c have the radial direction of the fixed scroll 31 as the longitudinal direction and round corners. It is a substantially rectangular groove.
- the first and second fixed scroll keyways 313b and 313c are formed over the intermittent sliding surface R2 and the non-sliding surface R3 from the vicinity of the boundary between the sliding surface R1 and the intermittent sliding surface R2 to the outer edge of the peripheral edge 313. Is done.
- the first and second fixed scroll keyways 313b and 313c are arranged point-symmetrically with respect to the center of the fixed side end plate 311 of the fixed scroll 31 in a plan view as shown in FIG.
- the first and second fixed scroll keyways 313b and 313c are formed so as not to penetrate the peripheral edge 313 in the vertical direction.
- a second key portion 43 of the Oldham joint 40 described later is fitted, and in other words, in the longitudinal direction of the first and second fixed scroll key grooves 313b and 313c. It slides in the radial direction of the fixed scroll 31. That is, the second key portion sliding space S2 in which the second key portion 43 slides is formed in the first and second fixed scroll key grooves 313b and 313c, respectively.
- the second key portion sliding space S2 is a space that always communicates with a back pressure space 36 described later.
- the distance (width) in the short direction of the first and second fixed scroll key grooves 313b and 313c is formed to be substantially equal to the width in the circumferential direction of the second key portion 43. More specifically, the distance in the short direction of the first and second fixed scroll key grooves 313b and 313c is determined so that the second key portion 43 smoothly slides in the first and second fixed scroll key grooves 313b and 313c. As far as possible, the gap when the second key portion 43 is fitted into the first and second fixed scroll key grooves 313b and 313c is formed to be as small as possible.
- the distance between the upper surface of the second key portion 43 and the upper surfaces of the first and second fixed scroll key grooves 313b and 313c is short of the second key portion 43 and the first and second fixed scroll key grooves 313b and 313c. It is set to be longer than the gap with the hand direction.
- the first oil groove 313d is located at the boundary between the constantly sliding surface R1 and the intermittent sliding surface R2 in the constantly sliding surface R1. It is formed in a substantially arc shape so as to follow.
- the first oil groove 313d is formed in the vicinity of the second fixed scroll key groove 313c so as to approach the inner edge side of the peripheral edge portion 313, that is, to approach the fixed side wrap 312.
- the cross section of the first oil groove 313d is substantially rectangular, but is not limited to this, and may be substantially triangular or arcuate.
- the first oil groove 313 d is formed in the counterclockwise direction when the fixed scroll 31 is viewed from below, from the vicinity of the communication groove 314 described later to the vicinity of the end of winding of the fixed side wrap 312.
- the first oil groove 313d does not communicate with the communication groove 314.
- the angle region where the first oil groove 313d is formed with respect to the center of the fixed side end plate 311 is an angle other than the first angle region A1 and the first angle region A1 in plan view.
- the region is defined as a second angle region A2.
- Oil L for lubricating the contact portion between the peripheral edge 313 and the movable side end plate 321 is supplied to the first oil groove 313d.
- Oil L in a high-pressure eccentric space 37 described later is supplied to the first oil groove 313d from a communication hole 313e through a first oil introduction path 331 and a second oil introduction path 90 described later.
- the first oil groove 313d is supplied with the oil L adjusted to a pressure slightly lower than the high pressure (discharge pressure) by being depressurized by the flow restriction member 95 provided in the second oil introduction path 90.
- the second oil groove 80 is a groove formed in the second angle region A2 with respect to the center of the fixed side end plate 311.
- the second oil groove 80 includes a circular second oil groove 81 and a J-shaped second oil groove 82.
- the circular second oil groove 81 is a circular oil groove.
- the groove here is not limited to an elongated recess, but is defined as including a recess of another shape.
- a plurality of circular second oil grooves 81 are formed at positions where the oil L spreads over particularly severe portions of the upper surface 321a of the movable scroll 32 sliding with the lower surface 313a of the peripheral edge portion 313.
- a plurality of circular second oil grooves 81 are formed in the second angle region A2 at substantially equal intervals in the circumferential direction with respect to the center of the fixed side end plate 311.
- the circular second oil groove 81 is formed in the intermittent sliding surface R2, and communicates with the back pressure space 36 described later at least for a certain period during the revolution cycle of the movable scroll 32 with respect to the fixed scroll 31 described later.
- the J-shaped second oil groove 82 includes an extending portion 82 a extending from the outer edge of the peripheral edge portion 313 toward the center of the fixed side end plate 311, and an end of the extending portion 82 a on the inner edge side of the peripheral edge portion 313.
- a substantially J-shaped groove having a curved portion 82b extending from the portion and curved outward with respect to the center of the fixed-side end plate 311.
- the extending portion 82 a extends between the circular second oil groove 81 disposed closest to the communication groove 314 and the circular second oil groove 81 adjacent thereto.
- the curved portion 82b of the J-shaped second oil groove 82 is disposed so as to face the curved portion 314b of the communication groove 314 described later.
- the curved portion 82b of the J-shaped second oil groove 82 is arranged so that the side with the large curvature faces the side with the large curvature of the curved portion 314b of the communication groove 314.
- the J-shaped second oil groove 82 is always formed over the sliding surface R1, the intermittent sliding surface R2, and the non-sliding surface R3, and always communicates with the back pressure space 36 described later.
- the communication groove 314 has a communication hole 321c formed in the movable side end plate 321 of the movable scroll 32 when the movable scroll 32 revolves with respect to the fixed scroll 31 as described later. Is formed on the constantly sliding surface R1 in the second angle region A2 so as to intermittently communicate with a back pressure space 36 described later.
- the communication groove 314 is formed in the radial direction of the fixed scroll 31 so as to extend from the inner edge of the peripheral edge 313 to near the boundary between the sliding surface R1 and the intermittent sliding surface R2. As shown in FIG. 2, the communication groove 314 is formed on the inner side by about one turn from the end of winding of the fixed side wrap 312.
- the communication groove 314 communicates with the intermediate pressure compression chamber 35 located on the peripheral side.
- the intermediate pressure indicates a pressure intermediate between the suction pressure and the discharge pressure.
- the communication groove 314 includes an extending portion 314 a that extends from the inner edge of the peripheral edge portion 313 to the outside in the circumferential direction of the fixed scroll 31, and an end portion of the extending portion 314 a on the outer edge side of the peripheral edge portion 313.
- a J-shaped groove having a curved portion 314b extending and curved inwardly with respect to the center of the fixed side end plate 311.
- an intermediate pressure compression chamber 35 and a back pressure space 36 located on the peripheral side are intermittently connected via the communication groove 314 and the communication hole 321c. Communicated. That is, the compression chamber 35 located on the peripheral side and the back pressure space 36 communicate with each other for at least a certain period with respect to one revolution cycle of the movable scroll 32.
- the movable scroll 32 includes a substantially disc-shaped movable side end plate 321 and a spiral projecting from the front surface (upper surface 321a) of the movable side end plate 321. And a boss portion 323 that protrudes from the back surface (lower surface 321b) of the movable side end plate 321 and is formed in a cylindrical shape.
- each convex portion 321i is formed with first and second movable scroll keyways 321e and 321f that open downward.
- the first and second movable scroll key grooves 321e and 321f are respectively formed on convex portions 321i arranged to face the center of the movable side end plate 321 as shown in FIG.
- the first and second movable scroll key grooves 321e and 321f are substantially rectangular grooves whose corners are rounded with the radial direction of the movable scroll 32 as the longitudinal direction.
- the first and second movable scroll key grooves 321e and 321f are formed on the lower surface 321b of the movable side end plate 321 up to the vicinity of the center in the vertical direction (thickness direction) of the movable side end plate 321.
- the first and second movable scroll key grooves 321e and 321f are arranged in a direction rotated 90 degrees with respect to the first and second fixed scroll key grooves 313b and 313c formed in the fixed side end plate 311.
- a first key portion 42 of the Oldham coupling 40 to be described later is fitted into the first and second movable scroll key grooves 321e and 321f, and is movable in the longitudinal direction of the first and second movable scroll key grooves 321e and 321f. It slides in the radial direction of the scroll 32.
- the distance (width) in the short direction of the first and second movable scroll key grooves 321e and 321f is formed to be substantially equal to the width in the circumferential direction of the first key portion 42.
- the distance in the short direction between the first and second movable scroll key grooves 321e and 321f is determined so that the first key portion 42 smoothly slides within the first and second movable scroll key grooves 321e and 321f.
- the gap when the first key portion 42 is fitted into the first and second movable scroll key grooves 321e and 321f is formed to be as small as possible.
- the distance between the upper surface of the first key portion 42 and the upper surfaces of the first and second movable scroll key grooves 321e and 321f is short of the first key portion 42 and the first and second fixed scroll key grooves 313b and 313c. It is set longer than the distance of the gap with the direction.
- the movable side end plate 321 of the movable scroll 32 has a communication hole 321c that intermittently connects a communication groove 314 formed in the peripheral edge 313 of the fixed scroll 31 and a back pressure space 36 described later. It is formed so as to penetrate 321 in the thickness direction.
- the communication hole 321c is disposed so as to communicate with the communication groove 314 for a predetermined period in one revolution cycle. The communication between the communication hole 321c and the communication groove 314 will be described later.
- the boss portion 323 is a cylindrical portion whose upper end is blocked.
- the boss portion 323 and the eccentric portion 61 are connected by inserting an eccentric portion 61 of the crankshaft 60 described later into the boss portion 323.
- the boss portion 323 is disposed in an eccentric portion space 37 formed between the movable scroll 32 and a housing 33 described later.
- the eccentric portion space 37 is supplied with high-pressure oil L from the oil sump space 26 communicating with the high-pressure first space S1, and as a result, the eccentric portion space 37 has a high pressure. More specifically, the pressure in the eccentric portion space 37 is substantially equal to the discharge pressure of the scroll compressor 10 at the steady state. Due to the pressure acting on the eccentric portion space 37, a force is generated on the lower surface 321 b of the movable side end plate 321 in the eccentric portion space 37 to push the movable scroll 32 upward toward the fixed scroll 31. The movable scroll 32 is in close contact with the fixed scroll 31 by the resultant force of the force generated by the pressure in the eccentric portion space 37 and the force generated by the pressure in the back pressure space 36 described later.
- the movable scroll 32 is engaged with the fixed scroll 31 via an Oldham joint 40 described later.
- the Oldham joint 40 is a member that prevents the orbiting scroll 32 from rotating and revolves.
- the crankshaft 60 connected by the boss portion 323 and the eccentric portion 61 rotates, the first key portion 42 of the Oldham joint 40 is in the first and second movable scroll key grooves 321e and 321f, and the second key portion 43 is in the first position.
- the first and second fixed scroll keyways 313b and 313c slide, the movable scroll 32 revolves without rotating with respect to the fixed scroll 31, and the gas refrigerant in the compression chamber 35 is compressed.
- the compression chamber 35 is reduced in volume as it moves in the center direction of the fixed-side end plate 311 and the movable-side end plate 321 due to the revolution of the movable scroll 32, and the pressure in the compression chamber 35 is increased at the same time. To do. That is, the pressure in the central compression chamber 35 is higher than that in the peripheral compression chamber 35.
- the back pressure space 36 is a space formed above the housing 33 described later and on the back side (the lower surface 321b side) of the movable side end plate 321 of the movable scroll 32.
- the back pressure space 36 faces the lower surface 321b and the peripheral surface 321d of the movable side end plate 321.
- the back pressure space 36 is arranged on the peripheral side with respect to the eccentric space 37 formed near the center of the movable side end plate 321.
- a seal ring (not shown) is disposed between the housing 33 and the lower surface 321b of the movable side end plate 321.
- the back pressure space 36 communicates with the compression chamber 35 of intermediate pressure located on the peripheral side through the communication groove 314 and the communication hole 321 c. That is, the back pressure space 36 communicates with the compression chamber 35 located on the peripheral side for at least a certain period with respect to one revolution cycle of the movable scroll 32.
- the back pressure space 36 always communicates with the J-shaped second oil groove 82 formed in the peripheral edge 313 of the fixed scroll 31, and the circular second oil groove 81 is in one revolution cycle of the movable scroll 32. Communicate for a certain period of time.
- the back pressure space 36 communicates with the second key portion sliding space S2 in which the second key portion 43 of the Oldham joint 40 slides. Further, the back pressure space 36 communicates with an upper space S ⁇ b> 3 formed above the fixed scroll 31.
- the housing 33 is press-fitted into the cylindrical member 21, and is fixed over the entire circumferential direction on the outer peripheral surface thereof.
- the housing 33 and the fixed scroll 31 are arranged such that the upper end surface of the housing 33 faces the lower surface 313a of the peripheral edge 313 of the fixed scroll 31, and is fixed by a bolt or the like (not shown).
- the housing 33 has a second recess 33b disposed so as to be recessed in the center of the upper surface, a bearing housing portion 33c disposed below the second recess 33b, and a first disposed so as to surround the second recess 33b.
- a recess 33a is formed.
- the housing 33 is formed with an oil reservoir 33d for storing the oil L flowing into the eccentric space 37, and a first oil introduction path 331 communicating with the oil reservoir 33d.
- 2nd recessed part 33b surrounds the side surface of the eccentric part space 37 in which the boss
- a bearing metal 34 is provided in the bearing housing portion 33c.
- the bearing metal 34 rotatably supports the main shaft 62 of the crankshaft 60.
- a bearing housing oil passage through which oil L supplied for lubrication of the bearing metal 34 from an oil supply passage 63 formed in the main shaft 62 described later flows toward the eccentric portion space 37 is provided at the periphery of the bearing metal 34. 33ca is formed.
- the first recess 33a is a part of the lower surface and side surface surrounding the back pressure space 36.
- the oil reservoir 33d is a recess formed in an annular shape below the second recess 33b.
- the oil reservoir 33d stores oil L that has flowed into the eccentric space 37 from an oil supply path 63 described later.
- the oil L flows into the eccentric part space 37 mainly through the following paths.
- the oil L flows out from an upper end opening of an oil supply path 63 formed in the main shaft 62 to be described later, lubricates the sliding portion between the eccentric portion 61 of the crankshaft 60 and the boss portion 323 of the movable scroll 32, and then the eccentric portion space. 37.
- the oil L flows out from an opening (not shown) of the oil supply path 63 formed at a position facing the inner surface of the bearing metal 34 and lubricates the sliding portion between the main shaft 62 of the crankshaft 60 and the bearing metal 34. Then, it flows into the eccentric part space 37 through the bearing housing part oil passage 33 ca or from the upper end of the bearing metal 34.
- the high-pressure (substantially discharge pressure) oil L in the oil reservoir 33d is formed around the low-pressure or intermediate-pressure compression chamber 35 via the first oil introduction passage 331 and the second oil introduction passage 90 due to the differential pressure. Supplied to the first oil groove 313d.
- the first oil introduction path 331 includes a lateral passage 331a extending from the oil reservoir 33d, and a longitudinal passage 331b communicating the lateral passage 331a and the second oil introduction path 90.
- the horizontal passage 331a extends substantially horizontally from the outer peripheral surface of the housing 33 to the oil reservoir 33d.
- the opening of the outer peripheral surface of the housing 33 of the lateral passage 331 a is sealed by the cylindrical member 21.
- the longitudinal passage 331b extends substantially vertically so as to communicate the lateral passage 331a and the second oil introduction passage 90.
- the upper end opening of the vertical passage 331 b communicates with the first vertical passage 91 of the second oil introduction passage 90.
- the Oldham Joint 40 is a member for preventing the rotational movement of the movable scroll 32. As shown in FIG. 5, the Oldham Joint 40 is mainly composed of the ring portion 41, the first key portion 42, and the first key portion 42. 2 keys 43 are provided.
- the ring portion 41 is a substantially annular member, and has protruding portions 411 protruding outward in the radial direction at four locations.
- An upper surface 41a (front surface) and a lower surface 41b (back surface) of the ring portion 41 are substantially flat surfaces parallel to each other.
- the upper surface 41a of the ring portion 41 is a lower surface 321b of the movable side end plate 321 and the lower surface 41b of the ring portion 41 is a housing. It faces the bottom surface of the first recess 33a of 33 respectively.
- the first key portion 42 is a pair of convex portions extending upward from the protruding portion 411 of the ring portion 41 to the first and second movable scroll key grooves 321e and 321f of the movable scroll 32. That is, the first key portion 42 is a convex portion that extends upward from the upper surface 41 a (front surface) of the ring portion 41.
- the pair of first key portions 42 are arranged in a point manner with respect to the center of the ring portion 41.
- the first key portion 42 is fitted in the first and second movable scroll key grooves 321e and 321f of the movable scroll 32, and slides in the first and second movable scroll key grooves 321e and 321f.
- the second key portion 43 is a pair of convex portions extending upward from the protruding portion 411 of the ring portion 41 to the first and second fixed scroll key grooves 313b and 313c of the fixed scroll 31. That is, the second key portion 43 is a convex portion that extends upward from the upper surface 41 a (front surface) of the ring portion 41.
- the pair of second key parts 43 are arranged as point targets with respect to the center of the ring part 41. Further, in plan view, the second key portion 43 is disposed at a position rotated 90 degrees with respect to the center of the ring portion 41 with the first key portion 42.
- the second key portion 43 is fitted in the first and second fixed scroll key grooves 313b and 313c of the fixed scroll 31, and slides in the first and second fixed scroll key grooves 313b and 313c.
- the drive motor 50 is an example of a drive unit.
- the drive motor 50 includes an annular stator 51 fixed to the inner wall surface of the cylindrical member 21, and a rotor 52 that is rotatably accommodated with a slight gap (air gap passage) inside the stator 51.
- the rotor 52 is connected to the movable scroll 32 via a crankshaft 60 disposed so as to extend in the vertical direction along the axial center of the cylindrical member 21. As the rotor 52 rotates, the movable scroll 32 revolves periodically with respect to the fixed scroll 31, and the gas refrigerant in the compression chamber 35 is compressed.
- crankshaft 60 transmits the driving force of the drive motor 50 to the movable scroll 32.
- the crankshaft 60 is disposed so as to extend in the vertical direction along the axial center of the cylindrical member 21, and connects the rotor 52 of the drive motor 50 and the movable scroll 32 of the scroll compression mechanism 30.
- the crankshaft 60 has a main shaft 62 whose center axis coincides with the axial center of the cylindrical member 21, and an eccentric portion 61 that is eccentric with respect to the axial center of the cylindrical member 21.
- the eccentric portion 61 is connected to the boss portion 323 of the movable scroll 32 as described above.
- the main shaft 62 is rotatably supported by the bearing metal 34 of the bearing housing portion 33c of the housing 33 and a lower bearing 70 described later.
- the main shaft 62 is connected to the rotor 52 of the drive motor 50 between the bearing housing portion 33 c and the lower bearing 70.
- an oil supply path 63 for supplying oil L for lubrication to the scroll compression mechanism 30 and the like is formed.
- the oil supply path 63 extends substantially vertically in the crankshaft 60 from the lower end to the upper end of the crankshaft 60.
- the oil supply path 63 opens at the upper and lower ends of the crankshaft 60.
- an opening is formed in the oil supply path 63 so as to face the inner surface of the bearing metal 34 disposed in the bearing housing portion 33c.
- a positive displacement oil pump 65 is provided at the lower end opening of the oil supply passage 63.
- the oil supply pump 65 sucks up the oil L in the oil sump space 26 and supplies the oil L to the oil supply path 63.
- the lower bearing 70 is disposed below the drive motor 50.
- the lower bearing 70 is fixed to the cylindrical member 21.
- the lower bearing 70 constitutes a bearing on the lower end side of the crankshaft 60 and rotatably supports the main shaft 62 of the crankshaft 60.
- the suction pipe 23 and the compression chamber 35 are not in communication with each other, and the pressure in the compression chamber 35 increases as the volume of the compression chamber 35 decreases.
- the pressure of the gas refrigerant in the peripheral compression chamber 35 is an intermediate value (intermediate pressure) between the suction pressure and the discharge pressure.
- the high-pressure gas refrigerant compressed by the scroll compression mechanism 30 is discharged from the discharge port 311b located near the center of the fixed side end plate 311.
- the high-pressure gas refrigerant passes through a refrigerant passage (not shown) formed in the fixed scroll 31 and the housing 33 and flows into the first space S1.
- a refrigerant passage (not shown) formed in the fixed scroll 31 and the housing 33 and flows into the first space S1.
- the pressure in the first space S1 gradually increases and becomes substantially equal to the discharge pressure in a steady state.
- the gas refrigerant in the first space S1 is discharged from the discharge pipe 24.
- the pressure in the eccentric part space 37 will be described. Since the oil L is supplied from the oil sump space 26 to the eccentric part space 37, the pressure of the eccentric part space 37 becomes substantially equal to the pressure of the oil sump space 26. Since the oil sump space 26 communicates with the first space S1, the pressure is substantially the same as that of the first space S1. That is, the oil reservoir space 26 normally stores high-pressure (substantially discharge pressure) oil L. Therefore, the eccentric portion space 37 to which the oil L is supplied from the oil sump space 26 is also usually at a high pressure (substantially discharge pressure).
- the pressure in the back pressure space 36 will be described.
- the communication hole 321c of the movable side end plate 321 moves along a locus C indicated by a two-dot broken line in FIG. 6 in a plan view with respect to the communication groove 314 of the peripheral edge portion 313.
- the communication hole 321c of the movable side end plate 321 and the communication groove 314 of the peripheral portion 313 communicate with each other for a certain period during the revolution cycle of the movable scroll 32, and the intermediate pressure compression chamber 35 positioned on the peripheral side,
- the pressure space 36 communicates.
- the pressure in the back pressure space 36 becomes an intermediate pressure.
- the compression chamber 35 and the back pressure space 36 are intermittently communicated via the communication hole 321c and the communication groove 314, thereby controlling the pressure in the back pressure space 36 to a desired pressure. Is easy.
- the oil L stored in the oil reservoir 33d passes through the first oil introduction passage 331 and the second oil introduction passage 90 due to the differential pressure into the first oil groove 313d formed in the peripheral portion 313 of the fixed scroll 31. Supplied.
- the pressure of the oil L supplied to the first oil groove 313d is slightly lower than the high pressure (discharge pressure) because the pressure is reduced by the flow restriction member 95 provided in the second oil introduction path 90.
- the pressure of the oil L supplied to the first oil groove 313d is referred to as a semi-high pressure.
- the oil L supplied to the first oil groove 313d formed in the first angle region A1 causes the first oil on the lower surface 313a of the peripheral portion 313 and the upper surface 321a of the movable side end plate 321 when the movable scroll 32 revolves. It spreads in the vicinity of the groove 313d.
- the oil L is compressed by a differential pressure in a low pressure or intermediate pressure compression chamber located on the inner peripheral side of the first oil groove 313d. 35, the lower surface 313 a of the peripheral edge 313 and the upper surface 321 a of the movable side end plate 321 are moved in the substantially radial direction of the fixed scroll 31.
- the oil L is caused by the differential pressure toward the intermediate pressure back pressure space 36 located on the outer peripheral side of the movable scroll 32, that is, toward the outer peripheral side of the first oil groove 313d.
- the lower surface 313 a of the peripheral edge 313 and the upper surface 321 a of the movable side end plate 321 are moved.
- the oil L supplied to the first oil groove 313d mainly includes the constantly sliding surface R1 and the intermittent sliding surface R2 in the first angle region A1, and the constantly sliding surface R1 in the first angle region A1. It is supplied to the upper surface 321a of the movable side end plate 321 that contacts the intermittent sliding surface R2.
- the oil L in the eccentric portion space 37 leaks into the back pressure space 36 from a gap of a seal ring (not shown) provided between the lower surface 321b of the movable side end plate 321 and the housing 33. Since the circular second oil groove 81 is formed on the intermittent sliding surface R2, and the J-shaped second oil groove 82 is partially formed on the non-sliding surface R3 and the intermittent sliding surface R2, it is circular. The second oil groove 81 and the J-shaped second oil groove 82 communicate with the back pressure space 36 for a certain period during the revolution cycle of the movable scroll 32 (the J-shaped second oil groove 82 is always).
- the oil L is collected in the back pressure space 36 in the circular second oil groove 81 and the J-shaped second oil groove 82.
- the oil L collected in the circular second oil groove 81 and the J-shaped second oil groove 82 revolves around the movable scroll 32 so that the circular second oil groove 81 and the J-shaped second oil are revolved.
- the movable side end plate in contact with the constantly sliding surface R 1 and the intermittent sliding surface R 2 in the second angle region A 2 and the constantly sliding surface R 1 and the intermittent sliding surface R 2 in the second angle region A 2.
- 321 is supplied to the upper surface 321a of 321.
- the oil L collected in the J-shaped second oil groove 82 is supplied to the vicinity of the curved portion 314b of the communication groove 314.
- the scroll compressor 10 includes a fixed scroll 31, a movable scroll 32, and a drive motor 50.
- the fixed scroll 31 includes a flat fixed side end plate 311, a spiral fixed side wrap 312 protruding from the lower surface 311 a (front surface) of the fixed side end plate 311, and a peripheral portion as a thrust sliding portion surrounding the fixed side wrap 312. 313.
- the movable scroll 32 has a flat movable side end plate 321 and a spiral movable side wrap 322 protruding from the upper surface 321a (front side) of the movable side end plate 321.
- the drive motor 50 is connected to the movable scroll 32 via the crankshaft 60 and rotates the movable scroll 32.
- the fixed side wrap 312 and the movable side wrap 322 are combined so that the lower surface 311a of the fixed side end plate 311 and the upper surface 321a of the movable side end plate 321 face each other, and between the adjacent fixed side wrap 312 and the movable side wrap 322.
- the compression chamber 35 is formed.
- the drive motor 50 periodically rotates the movable scroll 32 to compress the gaseous refrigerant in the compression chamber 35.
- a back pressure space 36 communicating with the compression chamber 35 on the peripheral side is formed for at least a fixed period during the revolution cycle of the movable scroll 32.
- a communication hole 321 c communicating with the back pressure space 36 is formed in the movable side end plate 321.
- the peripheral oil 313 facing the upper surface 321a of the movable side end plate 321 has a first oil groove 313d and a communication groove on the constantly sliding surface R1 always in contact with the upper surface 321a of the movable side end plate 321 during one revolution cycle of the movable scroll 32. 314 is formed.
- a circular second oil groove 81 is provided on the intermittent sliding surface R2 that is always in contact with the upper surface 321a of the movable side end plate 321 for a certain period during one revolution cycle of the movable scroll 32.
- a J-shaped second oil groove 82 is formed over the intermittent sliding surface R2.
- the first oil groove 313d extends in an arc shape in the first angle region A1 with respect to the center of the fixed-side end plate 311 in plan view, and the oil L is supplied from the high-pressure oil sump space 26 to hold the oil L.
- the communication groove 314 is disposed in the second angle region A2 outside the first angle region A1 with respect to the center of the fixed-side end plate 311 in plan view, communicates with the compression chamber 35, and communicates with the communication hole 321c of the movable scroll 32 for a certain period. Communicate.
- the circular second oil groove 81 and the J-shaped second oil groove 82 are disposed in the second angle region A2 with respect to the center of the fixed side end plate 311 in plan view, and communicate with the back pressure space 36 for at least a certain period.
- a second oil groove 80 (circular second oil groove 81 and J-shaped second oil groove 82) communicating with the back pressure space 36 for a certain period is formed.
- the oil L supplied to the first oil groove 313d is supplied to a contact portion between the peripheral edge 313 and the movable side end plate 321 of the movable scroll 32.
- the oil L supplied to the peripheral edge portion 313 via the first oil groove 313d is supplied to the second angle region A2. Hateful.
- the second oil groove 80 (circular second oil groove 81 and J-shaped second oil groove 82) communicating with the back pressure space 36 is formed in the second angle region A2, the back pressure space 36 is formed. Is collected in the circular second oil groove 81 and the J-shaped second oil groove 82, and supplied to the contact portion between the peripheral edge 313 of the second angle region A2 and the movable side end plate 321.
- the first oil groove 313d, the circular second oil groove 81, and the J-shaped second oil groove 82 provide oil L to the entire contact portion between the peripheral edge 313 of the fixed scroll 31 and the movable side end plate 321 of the movable scroll 32. Can supply. As a result, the reliability of the scroll compressor 10 can be improved.
- the scroll compressor 10 includes a fixed scroll 31, a movable scroll 32, and a drive motor 50.
- the fixed scroll 31 includes a flat fixed side end plate 311, a spiral fixed side wrap 312 protruding from the lower surface 311 a (front surface) of the fixed side end plate 311, and a peripheral portion as a thrust sliding portion surrounding the fixed side wrap 312. 313.
- the movable scroll 32 has a flat movable side end plate 321 and a spiral movable side wrap 322 protruding from the upper surface 321a (front side) of the movable side end plate 321.
- the drive motor 50 is connected to the movable scroll 32 via the crankshaft 60 and rotates the movable scroll 32.
- the fixed side wrap 312 and the movable side wrap 322 are combined so that the lower surface 311a of the fixed side end plate 311 and the upper surface 321a of the movable side end plate 321 face each other, and between the adjacent fixed side wrap 312 and the movable side wrap 322.
- the compression chamber 35 is formed.
- the drive motor 50 periodically rotates the movable scroll 32 to compress the gaseous refrigerant in the compression chamber 35.
- a back pressure space 36 communicating with the compression chamber 35 on the peripheral side is formed for at least a fixed period during the revolution cycle of the movable scroll 32.
- a communication hole 321 c communicating with the back pressure space 36 is formed in the movable side end plate 321.
- the fixed scroll 31 is formed with a second oil introduction path 90 through which the oil L supplied from the high-pressure oil sump space 26 flows.
- the peripheral oil 313 facing the upper surface 321a of the movable side end plate 321 has a first oil groove 313d and a communication groove on the constantly sliding surface R1 always in contact with the upper surface 321a of the movable side end plate 321 during one revolution cycle of the movable scroll 32. 314 is formed.
- a circular second oil groove 81 is provided on the intermittent sliding surface R2 that is always in contact with the upper surface 321a of the movable side end plate 321 for a certain period during one revolution cycle of the movable scroll 32.
- a J-shaped second oil groove 82 is formed over the intermittent sliding surface R2.
- the first oil groove 313d extends in an arc shape in the first angle region A1 with respect to the center of the fixed side end plate 311 in a plan view, and the oil L is supplied from the second oil introduction path 90 to hold the oil L.
- the communication groove 314 is disposed in the second angle region A2 outside the first angle region A1 with respect to the center of the fixed-side end plate 311 in plan view, communicates with the compression chamber 35, and communicates with the communication hole 321c of the movable scroll 32 for a certain period. Communicate.
- the circular second oil groove 81 and the J-shaped second oil groove 82 are disposed in the second angle region A2 with respect to the center of the fixed side end plate 311 in plan view, and communicate with the back pressure space 36 for at least a certain period.
- the communication groove 314 extends in the radial direction with respect to the center of the fixed-side end plate 311 in a plan view and curves inward with respect to the center of the fixed-side end plate 311.
- the J-shaped second oil groove 82 is formed in a J-shape that extends in the radial direction toward the center of the fixed-side end plate 311 and curves outward with respect to the center of the fixed-side end plate 311 in plan view.
- the curved portion 314b of the communication groove 314 and the curved portion 82b of the J-shaped second oil groove 82 are arranged to face each other.
- the J-shaped second oil groove 82 is communicated with the J-shaped communication groove 314 because the J-shaped second oil groove 82 is formed so that the curved portion 314b and the curved portion 82b face each other. It can be arranged close to the groove 314. Further, the J-shaped second oil groove 82 can be disposed so that the curved portion 82 b of the J-shaped second oil groove 82 surrounds the curved portion 314 b of the communication groove 314. Therefore, even in the vicinity of the communication groove 314 where the oil L is difficult to be retained due to the influence of the refrigerant flow (the flow of refrigerant flowing from the compression chamber 35 into the back pressure space 36 through the communication groove 314 and the communication hole 321c). Oil L can be sufficiently supplied through the letter-shaped second oil groove 82. As a result, the reliability of the scroll compressor 10 can be improved.
- a part of the J-shaped second oil groove 82 is formed on the constantly sliding surface R1 that is always in contact with the upper surface 321a of the movable side end plate 321 of the peripheral edge 313. .
- the oil L is supplied to the constantly sliding surface R1 of the peripheral edge portion 313, which is always in contact with the movable side end plate 321 by the J-shaped second oil groove 82. Since the constantly sliding surface R1 is always in contact with the movable side end plate 321, particularly lubrication is required, and the oil L is sufficiently supplied to the constantly sliding surface R1, thereby improving the reliability of the scroll compressor 10. Can be increased.
- the communication groove 314 is always formed on the sliding surface R1
- the compression chamber 35 and the back pressure space 36 on the peripheral side communicate directly with each other only through the communication groove 314 and the communication hole 321c. Instead, the pressure in the back pressure space 36 is controlled to an optimum pressure.
- the oil L cannot be supplied from the back pressure space 36 to the contact portion between the peripheral edge 313 and the movable side end plate 321 via the communication groove 314.
- a part of the J-shaped second oil groove 82 communicating with the back pressure space 36 is formed in the constantly sliding surface R1 of the second angle region A2, the pressure control of the back pressure space 36 is realized.
- the oil L can be supplied to the constantly sliding surface R1 of the second angle region A2 of the peripheral edge 313.
- the first oil groove 313d is formed on the constantly sliding surface R1 of the first angle region A1, the oil L is easily supplied to the constantly sliding surface R1 of the peripheral edge portion 313 that particularly needs lubrication, and is reliable.
- a high scroll compressor 10 can be realized.
- the J-shaped second oil groove 82 is always in communication with the back pressure space 36.
- the J-shaped second oil groove 82 is always in communication with the back pressure space 36, the oil L is easily collected in the J-shaped second oil groove 82, and the J-shaped second oil groove 82 is easily collected. Oil L is easily supplied from 82 to the second angle region A2. As a result, the reliability of the scroll compressor 10 can be improved.
- the second oil groove 80 including the circular second oil groove 81 and the J-shaped second oil groove 82 includes a plurality of grooves.
- the oil L is easily held securely in the second oil grooves 80.
- the circular second oil groove 81 and the J-shaped second oil groove 82 can be arranged by selecting an area where the oil L is difficult to be supplied. Therefore, the oil L is likely to be reliably supplied from the second oil groove 80 to the contact portion between the peripheral edge portion 313 of the second angle region A2 and the movable side end plate 321. As a result, the reliability of the scroll compressor 10 can be improved.
- the 2nd oil groove 80 consists of the circular 2nd oil groove 81 and the J-shaped 2nd oil groove 82, it is not limited to this, like FIG.7 and FIG.8, Instead of the circular second oil groove 81, an elliptical second oil groove 81a having an elliptical shape or a rectangular second oil groove 81b having a rectangular shape may be formed.
- the rectangle here includes a rectangle with rounded corners as shown in FIG.
- each second oil groove 80 (circular second oil groove 81, J-shaped second oil groove 82, elliptical second oil groove 81a, rectangular second oil groove 81b) is, for example, as shown in FIG.
- the first distance D1 extends in the radial direction and the second distance D2 in the circumferential direction with respect to the center of the fixed-side end plate 311.
- the first distance D1 is preferably not less than the second distance D2.
- the second oil groove 80 (circular second oil groove 81, J-shaped second oil groove 82, elliptical second oil groove 81a, rectangular second oil groove 81b) has a diameter of the fixed scroll 31 in plan view.
- the peripheral portion of the movable side end plate 321 (the corner portion where the upper surface 321a and the peripheral surface 321d of the movable side end plate 321 intersect) is formed when the movable scroll 32 revolves (turns). There is a possibility of being caught in the second oil groove 80.
- the movable scroll 32 turns by the second oil groove 80 extending in the radial direction longer than the circumferential direction (including the same) (that is, by setting the first distance D1 ⁇ the second distance D2), the movable scroll 32 is not easily caught in the second oil groove 80. Therefore, the oil L can be supplied to the second angle region A2 without adversely affecting the turning motion of the movable scroll 32, and the highly reliable scroll compressor 10 can be realized.
- region A2 is easily formed by making the 2nd oil groove 80 into circular shape, an ellipse shape, a rectangular shape, or J shape, The reliability of the scroll compressor 10 can be increased.
- an elliptical second oil groove 81c is formed over the sliding surface R1, the intermittent sliding surface R2, and the non-sliding surface R3 as shown in FIG. Also good. Further, as shown in FIG. 10, an elliptical second oil groove 81d may be formed over the constantly sliding surface R1 and the intermittent sliding surface R2. The same applies when oil grooves having other shapes are formed.
- the circular second oil grooves 81 are arranged at substantially equal intervals in the circumferential direction of the fixed scroll 31, but are not limited thereto. Further, the number of circular second oil grooves 81 is not limited to that shown in FIG.
- the arrangement and quantity of the second oil groove 80 including the circular second oil groove 81 is determined so that the oil L is sufficiently supplied to the entire second angle region A2.
- the communication groove 314 ′ is substantially composed of an extending portion 314 a and a second extending portion 314 b ′ extending in a direction different from the extending direction of the extending portion 314 a from the outer edge side tip of the extending portion 314 a. It may be formed in an L shape.
- the extending portion 82a and the second extending portion 82b extending substantially in parallel to the second extending portion 314b ′ of the communication groove 314 ′ from the inner edge side tip of the extending portion 82a.
- a substantially L-shaped L-shaped second oil groove 82 ′ may be formed.
- the communication groove and the corresponding second oil groove may be linear.
- the second key portion sliding space S2 in which the second key portion 43 of the Oldham joint 40 slides is formed in the peripheral edge portion 313 of the fixed scroll 31, but the present invention is not limited to this.
- a second key portion sliding space in which the second key portion slides may be formed in the housing 33.
- the present invention provides a scroll in which a back pressure space is formed on the back side and side surface side of a movable scroll, and a communication groove is formed in the fixed scroll for communicating the intermediate pressure compression chamber and the back pressure space at a desired timing. Applicable to compressors.
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Abstract
Description
つまり、第1油溝及び第2油溝により、スラスト摺動部と第2鏡板との接触部分全体に油を供給できる。その結果、スクロール圧縮機の信頼性を高めることができる。
ここでは、第1油溝及び第2油溝により、スラスト摺動部と第2鏡板との接触部分全体に油を供給できる。その結果、スクロール圧縮機の信頼性を高めることができる。
ここでは、第2角度領域に油を供給するための第2油溝を容易な加工で形成し、スクロール圧縮機の信頼性を高めることができる。
ここでは、連通溝は常時摺動面に形成されるため、周縁側の圧縮室と背圧空間とは連通溝と連通穴とを介してしか直接連通されず、背圧空間の圧力が最適な圧力に制御される。一方で、連通溝を介して、スラスト摺動部と第2鏡板との接触部分に背圧空間から油を供給することはできない。しかし、背圧空間と連通する第2油溝の少なくとも一部が、第2角度領域の常時摺動面に形成されるため、背圧空間の圧力制御を実現しながら、スラスト摺動部の第2角度領域の常時摺動面に油を供給することができる。さらに、第1油溝が第1角度領域の常時摺動面に形成されるため、特に潤滑が必要なスラスト摺動部の常時摺動面に油が供給されやすく、信頼性の高いスクロール圧縮機を実現できる。
ここでは、第2油溝が背圧空間と常に連通しているため、油が第2油溝に確実に捕集されやすく、第2油溝から第2角度領域に油が供給されやすい。その結果、スクロール圧縮機の信頼性を高めることができる。
ここでは、第2油溝が複数存在するため、油が第2油溝に捕集されやすい。また、油が供給されにくいエリアを選んで第2油溝を配置することができる。そのため、第2油溝から、第2角度領域のスラスト摺動部と第2鏡板との接触部分に油が確実に供給されやすい。その結果、スクロール圧縮機の信頼性を高めることができる。
本発明のスクロール圧縮機の実施形態を、図面を参照しながら説明する。
本実施形態に係るスクロール圧縮機10は、例えば、空気調和装置の室外機に使用される。
(2-1)ケーシング
スクロール圧縮機10は、縦長円筒状のケーシング20を有する。ケーシング20は、上下が開口した略円筒状の円筒部材21と、円筒部材21の上端及び下端にそれぞれ設けられた上蓋22a及び下蓋22bと、を有する。円筒部材21と、上蓋22a及び下蓋22bとは、気密を保つように溶接により固定される。
スクロール圧縮機構30は、図1に示されるように、主に、ハウジング33と、ハウジング33の上方に配置される固定スクロール31と、固定スクロール31と組み合わされて圧縮室35を形成する可動スクロール32と、を有する。可動スクロール32とハウジング33との間には、偏心部空間37及び背圧空間36が形成される。
固定スクロール31は、図1及び図2に示されるように、円板状の固定側鏡板311と、固定側鏡板311の前面(下面311a)から突出する渦巻状の固定側ラップ312と、固定側ラップ312を囲む周縁部313とを有する。
第1及び第2固定スクロールキー溝313b,313cは、図2のように、固定スクロール31の径方向を長手方向とし、角部に丸みがつけられた略矩形状の溝である。第1及び第2固定スクロールキー溝313b,313cは、常時摺動面R1と間欠摺動面R2との境界付近から周縁部313の外縁まで、間欠摺動面R2及び非摺動面R3にわたって形成される。第1及び第2固定スクロールキー溝313b,313cは、図2のように、平面視において固定スクロール31の固定側鏡板311の中心に対し点対称に配置される。第1及び第2固定スクロールキー溝313b,313cは、上下方向に周縁部313を貫通しないように形成される。
第1油溝313dは、図2に示されるように、常時摺動面R1において、常時摺動面R1と間欠摺動面R2との境界に沿うように略円弧状に形成される。第1油溝313dは、第2固定スクロールキー溝313c付近では、周縁部313の内縁側に近づくように、すなわち固定側ラップ312に近づくように形成されている。第1油溝313dの断面は略矩形状であるが、これに限定されるものではなく、略三角形状、円弧形状などであってもよい。
第2油溝80は、固定側鏡板311の中心に対し、第2角度領域A2内に形成される溝である。第2油溝80には、円状第2油溝81及びJ字状第2油溝82が含まれる。
連通溝314は、後述するように可動スクロール32が固定スクロール31に対して公転する時に、可動スクロール32の可動側鏡板321に形成された連通穴321cを介して後述する背圧空間36と間欠的に連通するように、第2角度領域A2内の常時摺動面R1に形成される。連通溝314は、固定スクロール31の径方向に、周縁部313の内縁部から、常時摺動面R1と間欠摺動面R2との境界近くまで延びるように形成される。連通溝314は、図2のように、固定側ラップ312の巻き終わりから約1周分内側に形成される。また、連通溝314は、周縁側に位置する、中間圧の圧縮室35と連通する。なお、中間圧とは、吸入圧と吐出圧との中間の圧力を示す。
可動スクロール32は、図1及び図4に示されるように、略円板状の可動側鏡板321と、可動側鏡板321の前面(上面321a)から突出する渦巻状の可動側ラップ322と、可動側鏡板321の背面(下面321b)から突出し円筒状に形成されたボス部323とを有する。
背圧空間36は、後述するハウジング33の上方であって、可動スクロール32の可動側鏡板321の背面側(下面321b側)に形成される空間である。背圧空間36は、可動側鏡板321の下面321b及び周縁面321dと面する。背圧空間36は、可動側鏡板321の中央付近に形成される偏心部空間37に対し周縁側に配置される。なお、背圧空間36と偏心部空間37とを気密状態で隔てるため、ハウジング33と可動側鏡板321の下面321bとの間には図示しないシールリングが配置される。
ハウジング33は、円筒部材21に圧入され、その外周面において周方向の全体に亘って固定されている。また、ハウジング33と固定スクロール31とは、ハウジング33の上端面が、固定スクロール31の周縁部313の下面313aと対向するように配置され、図示しないボルト等により固定されている。
オルダム継手40は、可動スクロール32の自転運動を防止するための部材であって、図5に示されるように、主に、リング部41、第1キー部42及び第2キー部43を有する。
駆動モータ50は、駆動部の一例である。駆動モータ50は、円筒部材21の内壁面に固定された環状のステータ51と、ステータ51の内側に僅かな隙間(エアギャップ通路)を空けて回転自在に収容されたロータ52とを有する。
クランクシャフト60は、駆動モータ50の駆動力を可動スクロール32に伝達する。クランクシャフト60は、円筒部材21の軸心に沿って上下方向に延びるように配置され、駆動モータ50のロータ52と、スクロール圧縮機構30の可動スクロール32とを連結する。
下部軸受70は、駆動モータ50の下方に配置される。下部軸受70は、円筒部材21と固定されている。下部軸受70は、クランクシャフト60の下端側の軸受を構成し、クランクシャフト60の主軸62を回転自在に支持する。
スクロール圧縮機10の動作について説明する。
駆動モータ50が駆動されると、ロータ52が回転し、ロータ52と連結されたクランクシャフト60も回転する。クランクシャフト60が回転すると、オルダム継手40の働きにより、可動スクロール32は自転せずに、固定スクロール31に対して公転する。そして、低圧の(吸入圧の)ガス冷媒が、吸入管23を通ってケーシング20内に吸引される。より具体的には、低圧のガス冷媒が、吸入管23から圧縮室35へ、圧縮室35の周縁側から吸引される。可動スクロール32が公転するのに従い、吸入管23と圧縮室35とは連通しなくなり、圧縮室35の容積が減少するのに伴って、圧縮室35の圧力が上昇する。ガス冷媒は、周縁側の圧縮室35から、中央側の圧縮室35へ移動するにつれ圧力が上昇し、最終的に高圧(吐出圧)となる。周縁側の圧縮室35のガス冷媒の圧力は、吸入圧と吐出圧との中間の値(中間圧)である。スクロール圧縮機構30によって圧縮された高圧のガス冷媒は、固定側鏡板311の中央付近に位置する吐出口311bから吐出される。その後、高圧のガス冷媒は、固定スクロール31及びハウジング33に形成された図示しない冷媒通路を通過して、第1空間S1へ流入する。スクロール圧縮機10の起動後、第1空間S1の圧力は次第に上昇し、定常時には、略吐出圧に等しくなる。第1空間S1のガス冷媒は、吐出管24から吐出される。
クランクシャフト60が回転すると、油溜め空間26の油Lは、給油経路63を通ってクランクシャフト60の上端の開口まで上方に流れ、開口から流出する。また、給油経路63を流れる油Lの一部は、軸受ハウジング部33cに設けられる軸受メタル34の内面に対向するように形成された図示しない開口から流出する。給油経路63の上端開口から流出する油Lは偏心部61とボス部323との摺動部を、軸受メタル34の内面に対向するように形成された開口から流出する油Lは主軸62と軸受メタル34との摺動部を潤滑した後、偏心部空間37に流入する。一部の油Lは油溜部33dに貯留される。
(4-1)
本実施形態のスクロール圧縮機10では、固定スクロール31と、可動スクロール32と、駆動モータ50と、を備える。固定スクロール31は、平板状の固定側鏡板311と、固定側鏡板311の下面311a(前面)から突出する渦巻状の固定側ラップ312と、固定側ラップ312を囲むスラスト摺動部としての周縁部313と、を有する。可動スクロール32は、平板状の可動側鏡板321と、可動側鏡板321の上面321a(前面)から突出する渦巻状の可動側ラップ322と、を有する。駆動モータ50は、可動スクロール32とクランクシャフト60を介して連結され、可動スクロール32を旋回させる。固定側ラップ312と可動側ラップ322とは、固定側鏡板311の下面311aと可動側鏡板321の上面321aとが対向するように組み合わされ、隣接する固定側ラップ312と可動側ラップ322との間に圧縮室35を形成する。駆動モータ50は、可動スクロール32を周期的に旋回させて圧縮室35内のガス状の冷媒を圧縮する。可動スクロール32の可動側鏡板321の下面321b(背面)側には、可動スクロール32の公転サイクル中の少なくとも一定期間、周縁側の圧縮室35と連通する背圧空間36が形成される。可動側鏡板321には、背圧空間36と連通する連通穴321cが形成される。可動側鏡板321の上面321aに対向する周縁部313には、可動スクロール32の1公転サイクル中、可動側鏡板321の上面321aに常に接する常時摺動面R1に、第1油溝313d及び連通溝314が形成される。また、周縁部313には、可動スクロール32の1公転サイクル中の一定期間、可動側鏡板321の上面321aに常に接する間欠摺動面R2に円状第2油溝81が、常時摺動面R1及び間欠摺動面R2にわたってJ字状第2油溝82が、形成される。第1油溝313dは、平面視において固定側鏡板311の中心に対し第1角度領域A1内で円弧状に延び、高圧の油溜め空間26から油Lが供給され油Lが保持される。連通溝314は、平面視において固定側鏡板311の中心に対し第1角度領域A1外の第2角度領域A2内に配置され、圧縮室35と連通すると共に可動スクロール32の連通穴321cと一定期間連通する。円状第2油溝81及びJ字状第2油溝82は、平面視において固定側鏡板311の中心に対し第2角度領域A2内に配置され、背圧空間36と少なくとも一定期間連通する。
本実施形態のスクロール圧縮機10では、固定スクロール31と、可動スクロール32と、駆動モータ50と、を備える。固定スクロール31は、平板状の固定側鏡板311と、固定側鏡板311の下面311a(前面)から突出する渦巻状の固定側ラップ312と、固定側ラップ312を囲むスラスト摺動部としての周縁部313と、を有する。可動スクロール32は、平板状の可動側鏡板321と、可動側鏡板321の上面321a(前面)から突出する渦巻状の可動側ラップ322と、を有する。駆動モータ50は、可動スクロール32とクランクシャフト60を介して連結され、可動スクロール32を旋回させる。固定側ラップ312と可動側ラップ322とは、固定側鏡板311の下面311aと可動側鏡板321の上面321aとが対向するように組み合わされ、隣接する固定側ラップ312と可動側ラップ322との間に圧縮室35を形成する。駆動モータ50は、可動スクロール32を周期的に旋回させて圧縮室35内のガス状の冷媒を圧縮する。可動スクロール32の可動側鏡板321の下面321b(背面)側には、可動スクロール32の公転サイクル中の少なくとも一定期間、周縁側の圧縮室35と連通する背圧空間36が形成される。可動側鏡板321には、背圧空間36と連通する連通穴321cが形成される。固定スクロール31には、高圧の油溜め空間26から供給された油Lが流れる第2油導入路90が形成される。可動側鏡板321の上面321aに対向する周縁部313には、可動スクロール32の1公転サイクル中、可動側鏡板321の上面321aに常に接する常時摺動面R1に、第1油溝313d及び連通溝314が形成される。また、周縁部313には、可動スクロール32の1公転サイクル中の一定期間、可動側鏡板321の上面321aに常に接する間欠摺動面R2に円状第2油溝81が、常時摺動面R1及び間欠摺動面R2にわたってJ字状第2油溝82が、形成される。第1油溝313dは、平面視において固定側鏡板311の中心に対し第1角度領域A1内で円弧状に延び、第2油導入路90から油Lが供給され油Lが保持される。連通溝314は、平面視において固定側鏡板311の中心に対し第1角度領域A1外の第2角度領域A2内に配置され、圧縮室35と連通すると共に可動スクロール32の連通穴321cと一定期間連通する。円状第2油溝81及びJ字状第2油溝82は、平面視において固定側鏡板311の中心に対し第2角度領域A2内に配置され、背圧空間36と少なくとも一定期間連通する。
本実施形態のスクロール圧縮機10では、連通溝314は、平面視において、固定側鏡板311の中心に対して径方向に延び、固定側鏡板311の中心に対して内向きに湾曲するJ字形状に形成される。J字状第2油溝82は、平面視において、固定側鏡板311の中心に向かって径方向に延び、固定側鏡板311の中心に対し外向きに湾曲するJ字形状に形成される。連通溝314の湾曲部314bと、J字状第2油溝82の湾曲部82bとは、対面するように配置される。
さらに、本実施形態のスクロール圧縮機10では、J字状第2油溝82は、周縁部313の、可動側鏡板321の上面321aと常に接する、常時摺動面R1に一部が形成される。
さらに、本実施形態のスクロール圧縮機10では、第1油溝313dおよび連通溝314は、常時摺動面R1に形成される。
本実施形態のスクロール圧縮機10では、J字状第2油溝82は、背圧空間36と常に連通する。
本実施形態のスクロール圧縮機10では、円状第2油溝81及びJ字状第2油溝82からなる第2油溝80は、複数の溝からなる。
上記実施形態は、本発明の趣旨を逸脱しない範囲で適宜変更可能である。
上記実施形態では、第2油溝80は、円状第2油溝81及びJ字状第2油溝82からなるが、これに限定されるものではなく、図7及び図8のように、円状第2油溝81に代えて、楕円形状の楕円状第2油溝81a、又は、矩形状の矩形状第2油溝81bが形成されてもよい。なお、ここでの矩形には、図8のように角部に丸みがつけられた矩形を含む。
上記実施形態及び変形例Aでは、円状第2油溝81、楕円状第2油溝81a、及び矩形状第2油溝81bは、間欠摺動面R2に形成されるが、これに限定されるものではない。
上記実施形態では、円状第2油溝81は、固定スクロール31の周方向に略等間隔に配置されるが、これに限定されるものではない。また、円状第2油溝81の数量は、図2に記載のものに限定されるものではない。
上記実施形態では、周縁部313の下面313aに、略J字形状の、連通溝314及びJ字状第2油溝82が形成されるが、これに限定されるものではない。
上記実施形態では、オルダム継手40の第2キー部43が摺動する第2キー部摺動空間S2が、固定スクロール31の周縁部313に形成されるが、これに限定されるものではない。例えば、特許文献1のように、ハウジング33に第2キー部の摺動する第2キー部摺動空間が形成されてもよい。
26 油溜め空間(高圧空間)
31 固定スクロール
311 固定側鏡板(第1鏡板)
311a 固定側鏡板の下面(第1鏡板の前面)
312 固定側ラップ(第1ラップ)
313 周縁部(スラスト摺動部)
313d 第1油溝
314,314’ 連通溝
32 可動スクロール
321 可動側鏡板(第2鏡板)
321a 可動側鏡板の上面(第2鏡板の前面)
321b 可動側鏡板の下面(第2鏡板の背面)
321c 連通穴
322 可動側ラップ(第2ラップ)
35 圧縮室
36 背圧空間
50 駆動モータ(駆動部)
60 クランクシャフト
80 第2油溝
81 円状第2油溝(第2油溝)
81a 楕円状第2油溝(第2油溝)
81b 矩形状第2油溝(第2油溝)
81c 楕円状第2油溝(第2油溝)
81d 楕円状第2油溝(第2油溝)
82 J字状第2油溝(第2油溝)
82’ L字状第2油溝(第2油溝)
90 第2油導入路(油導入路)
A1 第1角度領域
A2 第2角度領域
D1 第1距離
D2 第2距離
L 油
R1 常時摺動面(摺動面)
R2 間欠摺動面(摺動面)
Claims (9)
- 平板状の第1鏡板(311)と、前記第1鏡板の前面(311a)から突出する渦巻状の第1ラップ(312)と、前記第1ラップを囲むスラスト摺動部(313)と、を有する固定スクロール(31)と、
平板状の第2鏡板(321)と、前記第2鏡板の前面(321a)から突出する渦巻状の第2ラップ(322)と、を有する可動スクロール(32)と、
前記可動スクロールとクランクシャフト(60)を介して連結され、前記可動スクロールを旋回させる駆動部(50)と、
を備え、
前記第1ラップと前記第2ラップとは、前記第1鏡板の前記前面と前記第2鏡板の前記前面とが対向するように組み合わされ、隣接する前記第1ラップと前記第2ラップとの間に圧縮室(35)を形成し、
前記駆動部は、前記可動スクロールを周期的に旋回させて前記圧縮室内のガス状の冷媒を圧縮し、
前記可動スクロールの前記第2鏡板の背面(321b)側には、前記可動スクロールの公転サイクル中の少なくとも一定期間、周縁側の前記圧縮室と連通する背圧空間(36)が形成され、
前記第2鏡板には、前記背圧空間と連通する連通穴(321c)が形成され、
前記第2鏡板の前記前面に対向する前記スラスト摺動部には、前記可動スクロールの前記1公転サイクル中少なくとも一定期間、前記第2鏡板の前記前面と接する摺動面(R1,R2)に、
平面視において前記第1鏡板の中心に対し第1角度領域(A1)内で円弧状に延び、高圧の前記圧縮室と連通する高圧空間(26)から油(L)が供給され前記油が保持される第1油溝(313d)と、
平面視において前記第1鏡板の前記中心に対し前記第1角度領域外の第2角度領域(A2)内に配置され、前記圧縮室と連通すると共に前記連通穴と少なくとも一定期間連通する連通溝(314,314’)と、
平面視において前記第1鏡板の前記中心に対し前記第2角度領域内に配置され、前記背圧空間と少なくとも一定期間連通する第2油溝(81,81a,81b,81c,81d,82,82’)と、が形成される
スクロール圧縮機(10)。 - 平板状の第1鏡板(311)と、前記第1鏡板の前面(311a)から突出する渦巻状の第1ラップ(312)と、前記第1ラップを囲むスラスト摺動部(313)と、を有する固定スクロール(31)と、
平板状の第2鏡板(321)と、前記第2鏡板の前面(321a)から突出する渦巻状の第2ラップ(322)と、を有する可動スクロール(32)と、
前記可動スクロールとクランクシャフト(60)を介して連結され、前記可動スクロールを旋回させる駆動部(50)と、
を備え、
前記第1ラップと前記第2ラップとは、前記第1鏡板の前記前面と前記第2鏡板の前記前面とが対向するように組み合わされ、隣接する前記第1ラップと前記第2ラップとの間に圧縮室(35)を形成し、
前記駆動部は、前記可動スクロールを周期的に旋回させて前記圧縮室内のガス状の冷媒を圧縮し、
前記可動スクロールの前記第2鏡板の背面(321b)側には、前記可動スクロールの公転サイクル中の少なくとも一定期間、周縁側の前記圧縮室と連通する背圧空間(36)が形成され、
前記第2鏡板には、前記背圧空間と連通する連通穴(321c)が形成され、
前記固定スクロールには、高圧の前記圧縮室と連通する高圧空間(26)から供給された油(L)が流れる油導入路(90)が形成され、
前記第2鏡板の前記前面に対向する前記スラスト摺動部には、前記可動スクロールの前記1公転サイクル中少なくとも一定期間、前記第2鏡板の前記前面と接する摺動面(R1,R2)に、
平面視において前記第1鏡板の中心に対し第1角度領域(A1)内で円弧状に延び、前記油導入路から前記油が供給され前記油が保持される第1油溝(313d)と、
平面視において前記第1鏡板の前記中心に対し前記第1角度領域外の第2角度領域(A2)内に配置され、前記圧縮室と連通すると共に前記連通穴と少なくとも一定期間連通する連通溝(314,314’)と、
平面視において前記第1鏡板の前記中心に対し前記第2角度領域内に配置され、前記背圧空間と少なくとも一定期間連通する第2油溝(81,81a,81b,81c,81d,82,82’)と、が形成される
スクロール圧縮機(10)。 - 前記第2油溝は、平面視において前記第1鏡板の前記中心に対し、径方向に第1距離(D1)、周方向に第2距離(D2)延び、
前記第1距離は、前記第2距離以上である、
請求項1又は2に記載のスクロール圧縮機。 - 前記第2油溝は、平面視において、円形状、楕円形状、矩形状、J字形状、又は、L字形状である、
請求項3に記載のスクロール圧縮機。 - 前記連通溝(314)は、平面視において、前記第1鏡板の前記中心に対して径方向に延び、前記第1鏡板の前記中心に対して内向きに湾曲するJ字形状に形成され、
前記第2油溝(82)の少なくとも1つは、平面視において、前記第1鏡板の前記中心に向かって径方向に延び、前記第1鏡板の前記中心に対し外向きに湾曲するJ字形状に形成され、
前記連通溝の湾曲部(314b)と、J字形状の前記第2油溝の湾曲部(82b)とは、対面するように配置される、
請求項1から4のいずれか1項に記載のスクロール圧縮機。 - 前記第2油溝(81c,81d,82,82’)は、前記スラスト摺動部の、前記第2鏡板の前記前面と常に接する常時摺動面(R1)に少なくとも一部が形成される、
請求項1から5のいずれか1項に記載のスクロール圧縮機。 - 前記第1油溝および前記連通溝は、前記常時摺動面に形成される、
請求項6に記載のスクロール圧縮機。 - 前記第2油溝(81c,82,82’)は、前記背圧空間と常に連通する、
請求項1から7のいずれか1項に記載のスクロール圧縮機。 - 前記第2油溝は、複数の溝からなる、
請求項1から8のいずれか1項に記載のスクロール圧縮機。
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JP2021042749A (ja) * | 2019-09-13 | 2021-03-18 | ダイキン工業株式会社 | スクロール圧縮機 |
JP7343774B2 (ja) * | 2019-11-21 | 2023-09-13 | ダイキン工業株式会社 | スクロール圧縮機 |
KR20220100707A (ko) * | 2019-12-17 | 2022-07-15 | 이구루코교 가부시기가이샤 | 슬라이딩 부품 |
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US6074186A (en) * | 1997-10-27 | 2000-06-13 | Carrier Corporation | Lubrication systems for scroll compressors |
JP2003286975A (ja) * | 2002-03-27 | 2003-10-10 | Mitsubishi Electric Corp | スクロール圧縮機 |
CN102084134B (zh) * | 2008-07-15 | 2014-03-26 | 大金工业株式会社 | 涡旋压缩机 |
KR101480464B1 (ko) * | 2008-10-15 | 2015-01-09 | 엘지전자 주식회사 | 스크롤 압축기 및 이를 적용한 냉동기기 |
JP4992948B2 (ja) * | 2009-09-18 | 2012-08-08 | ダイキン工業株式会社 | スクロール圧縮機 |
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2012
- 2012-09-27 JP JP2012215068A patent/JP5464248B1/ja active Active
-
2013
- 2013-09-27 EP EP13840750.7A patent/EP2918840B1/en active Active
- 2013-09-27 WO PCT/JP2013/076354 patent/WO2014051085A1/ja active Application Filing
- 2013-09-27 BR BR112015006708-5A patent/BR112015006708B1/pt active IP Right Grant
- 2013-09-27 KR KR1020157010376A patent/KR101724976B1/ko active IP Right Grant
- 2013-09-27 CN CN201380051268.1A patent/CN104685213B/zh active Active
- 2013-09-27 ES ES13840750.7T patent/ES2635264T3/es active Active
- 2013-09-27 US US14/431,712 patent/US9759216B2/en active Active
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JPH0539786A (ja) * | 1991-08-02 | 1993-02-19 | Hitachi Ltd | スクロール圧縮機 |
JP2001214872A (ja) | 1999-11-22 | 2001-08-10 | Daikin Ind Ltd | スクロール型圧縮機 |
JP2012067712A (ja) | 2010-09-27 | 2012-04-05 | Panasonic Corp | スクロール圧縮機 |
JP2012077616A (ja) * | 2010-09-30 | 2012-04-19 | Daikin Industries Ltd | スクロール型圧縮機 |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3112684A1 (en) * | 2015-06-23 | 2017-01-04 | Samsung Electronics Co., Ltd. | Compressor |
US10066625B2 (en) | 2015-06-23 | 2018-09-04 | Samsung Electronics Co., Ltd. | Compressor |
US11199188B2 (en) * | 2019-10-22 | 2021-12-14 | Lg Electronics Inc. | Scroll compressor having anti-rotation ring |
Also Published As
Publication number | Publication date |
---|---|
KR101724976B1 (ko) | 2017-04-07 |
BR112015006708A2 (pt) | 2017-07-04 |
BR112015006708B1 (pt) | 2022-05-10 |
EP2918840A1 (en) | 2015-09-16 |
EP2918840A4 (en) | 2016-05-11 |
JP2014070509A (ja) | 2014-04-21 |
ES2635264T3 (es) | 2017-10-03 |
CN104685213B (zh) | 2017-02-08 |
KR20150060838A (ko) | 2015-06-03 |
EP2918840B1 (en) | 2017-06-21 |
CN104685213A (zh) | 2015-06-03 |
US20150260189A1 (en) | 2015-09-17 |
US9759216B2 (en) | 2017-09-12 |
JP5464248B1 (ja) | 2014-04-09 |
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