EP2626561B1 - Spiralverdichter und Spiralverarbeitungsverfahren - Google Patents

Spiralverdichter und Spiralverarbeitungsverfahren Download PDF

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Publication number
EP2626561B1
EP2626561B1 EP13154305.0A EP13154305A EP2626561B1 EP 2626561 B1 EP2626561 B1 EP 2626561B1 EP 13154305 A EP13154305 A EP 13154305A EP 2626561 B1 EP2626561 B1 EP 2626561B1
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EP
European Patent Office
Prior art keywords
scroll
spiral
orbiting
fine depressions
wrap
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.)
Active
Application number
EP13154305.0A
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English (en)
French (fr)
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EP2626561A2 (de
EP2626561A3 (de
Inventor
Yoshiaki Miyamoto
Yoshiyuki Kimata
Hajime Sato
Masanari Uno
Masashi Hamano
Akihisa Ohira
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Mitsubishi Heavy Industries Ltd
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Mitsubishi Heavy Industries Ltd
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Publication date
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Publication of EP2626561A2 publication Critical patent/EP2626561A2/de
Publication of EP2626561A3 publication Critical patent/EP2626561A3/de
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
    • F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
    • F04C18/0215—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form where only one member is moving
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B39/00—Burnishing machines or devices, i.e. requiring pressure members for compacting the surface zone; Accessories therefor
    • B24B39/003—Burnishing machines or devices, i.e. requiring pressure members for compacting the surface zone; Accessories therefor the working tool being composed of a plurality of working rolls or balls
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
    • C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
    • C21D7/08—Modifying the physical properties of iron or steel by deformation by cold working of the surface by burnishing or the like
    • 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
    • F04C18/0292—Ports or channels located in the wrap
    • 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
    • F04C2210/00—Fluid
    • F04C2210/26—Refrigerants with particular properties, e.g. HFC-134a
    • F04C2210/261—Carbon dioxide (CO2)
    • 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
    • F04C2230/00—Manufacture
    • F04C2230/90—Improving properties of machine parts
    • F04C2230/92—Surface treatment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C27/00—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
    • F04C27/02—Liquid sealing for high-vacuum pumps or for compressors
    • 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

Definitions

  • the present invention relates to a scroll compressor and a scroll processing method with which it is possible to reduce refrigerant leakage from side surfaces of spiral wraps of a fixed scroll and an orbiting scroll that are in sliding contact with each other.
  • Compression chambers of a scroll compressor are formed by engaging a pairing of a fixed scroll and an orbiting scroll.
  • a pairing of of a fixed scroll and an orbiting scroll in which spiral wraps vertically provided on one surface of each of end plates are engaged so that the phases thereof are shifted 180° and also so that centers thereof are shifted by an amount corresponding to the orbiting radius.
  • spaces between wrap top surfaces of the individual spiral wraps and wrap bottom surfaces of the engaged scrolls are sealed by means of a tip seal or the like.
  • the space between the side surface of the spiral wrap of the fixed scroll and the side surface of the spiral wrap of the orbiting scroll is sealed by pressing them into contact by means of a passive crank mechanism or the like. By doing so, a pair of sealed compression chambers are formed.
  • the compression chamber compresses refrigerant by moving it from the outer-circumferential side to the center of the chamber while decreasing the volume thereof in accordance with revolving orbiting of the orbiting scroll.
  • Patent Literatures 1 and 2 disclose systems in which numerous fine dimples are provided on thrust sliding surfaces of various component members of a compression mechanism so that friction and wear are prevented by improving lubrication at sliding surfaces by holding oil in the fine dimples, and also so that internal leakage of working fluid is reduced.
  • Patent Literatures 1 and 2 described above disclose systems in which numerous fine dimples are provided on the thrust sliding surfaces of various component members forming the compression mechanism, the fine dimples are not provided on the side surfaces formed by curves of the spiral wraps.
  • shot peening is generally performed. Specifically, the sliding surfaces are blasted with spherical particles, thus forming dimples randomly thereon. In this case, it may be also considered that, by holding oil in the dimples, the sliding loss may be reduced and wear resistance may also be enhanced.
  • the present invention has been made in light of the circumstances described above, and an object thereof is to provide a scroll compressor and a scroll processing method with which further efficiency enhancement can be achieved by realizing both leakage reduction and sliding-loss reduction at the same time by enhancing the side-surface seal in spiral wraps that are in sliding contact with each other.
  • a scroll compressor and scroll processing method of the present invention employ the following solutions.
  • a scroll compressor is a scroll compressor comprising a compression mechanism formed by engaging a pairing of a fixed scroll and an orbiting scroll in each of which a spiral wrap is vertically provided on one surface of an end plate thereof, wherein a plurality of fine depressions are provided on one or both of a side surface of the spiral wrap of the fixed scroll and a side surface of the spiral wrap of the orbiting scroll, which are in sliding contact with each other.
  • plurality of fine depressions are provided on one or both of the side surface of the spiral wrap of the fixed scroll and the side surface of the spiral wrap of the orbiting scroll, which are in sliding contact with each other, in the paired fixed scroll and orbiting scroll that form the compression mechanism. Because of this, during the compression operation, by holding oil that has been taken into the compression chamber along with the refrigerant gas by means of the plurality of fine depressions provided on the side surfaces of the spiral wraps that are in sliding contact with each other, sliding contact surfaces can be sealed with that oil, and the sliding friction coefficient due to the contact can also be reduced. Therefore, re-compression loss can be reduced by reducing refrigerant-gas leakage. In addition, the compression efficiency of the scroll compressor can be further enhanced by reducing the sliding loss by lowering the sliding friction coefficient.
  • the fine depressions are formed as dimples elongated in a revolving direction of the orbiting scroll which is revolved about the fixed scroll in an orbital manner.
  • multiple rows of the fine depressions are arranged in a staggered manner along the height direction of the spiral wraps. Because of this, by means of the multiple rows of plurality of fine depressions arranged in a staggered manner, the oil can be held substantially evenly over the entire areas of the side surfaces of the spiral wraps that are in sliding contact with each other. Therefore, the reduction effects on re-compression loss and sliding loss can be further enhanced.
  • each of the fixed scroll and the orbiting scroll is provided with a step portion at a wrap top side and at a wrap bottom side of the spiral wrap thereof, and height of each of the spiral wraps is made higher in a portion closer to the outer circumference thereof relative to the step portion than a portion closer to the inner circumference thereof relative to the step portion; and the fine depressions are also provided on a sliding contact surface of each of the step portions.
  • so-called stepped scrolls are employed as the fixed scroll and the orbiting scroll, and the fine depressions are also provided on sliding contact surfaces of the step portions thereof. Because of this, the sliding contact surfaces of the step portions can also be sealed with oil by holding the oil by providing the fine depressions on the sliding contact surfaces formed in the step portions. Therefore, refrigerant leakage can effectively be reduced at the step portions, where, structurally, refrigerant leakage tends to occur, and thus, it is possible to further enhance the efficiency of a so-called stepped scroll compressor.
  • the scroll compressor is a CO 2 -refrigerant compressor for a supercritical cycle system using CO 2 -refrigerant.
  • the scroll compressor is a CO 2 - refrigerant compressor for a supercritical cycle system using CO 2 refrigerant. Because of this, even if the present invention is employed in a scroll compressor for CO 2 refrigerant which is a higher-pressure refrigerant than HFC refrigerant and with which the pressure difference during compression increases, refrigerant leakage can effectively be reduced, as described above. Therefore, it is possible to further increase the performance of a CO 2 -refrigerant scroll compressor, and it is possible to enhance the COP (coefficient of performance) of supercritical-cycle air conditioners, refrigerators, heat pumps, and so forth employing the compressor.
  • COP coefficient of performance
  • An embodiment is directed to a scroll processing method for forming a plurality of fine depressions on a side surface of a spiral wrap of one or both of a fixed scroll and an orbiting scroll that form a scroll compressor, wherein the fine depressions are processed on the side surfaces of the spiral wraps by pressing and rotating a burnishing tool, which has a plurality of rolling elements that roll while vibrating at an outer circumferential surface thereof, against the side surfaces of the spiral wraps so as to dent the processed surfaces to form the deformations.
  • plurality of fine depressions can be processed on the side surfaces of the spiral wraps by pressing and rotating the burnishing tool, in which numerous rolling elements that roll while vibrating are held at the outer circumferential surface thereof, against the side surfaces of the spiral wraps of the fixed scroll and/or the orbiting scroll so as to dent the processed surfaces to cause deformation thereof. Because of this, merely by pressing and rolling the burnishing tool against the side surfaces of the spiral wraps, plurality of fine depressions having the desired shape and size can easily be processed in a regular arrangement.
  • this processing is a type of deformation processing for enhancing surface hardness, surface roughness, and so forth, and thus, durability, wear resistance, and so forth of the spiral wraps can also be enhanced by this processing.
  • a scroll compressor of the present invention With a scroll compressor of the present invention, during the compression operation, by holding oil that has been taken into the compression chamber along with refrigerant gas by means of plurality of fine depressions provided on side surfaces of spiral wraps that are in sliding contact with each other, sliding contact surfaces can be sealed with that oil, and the sliding friction coefficient due to the contact can also be reduced. Because of this, re-compression loss can be reduced by reducing refrigerant-gas leakage, the sliding loss can also be reduced by lowering the sliding friction coefficient, and thus, the compression efficiency of the scroll compressor can be further enhanced.
  • a scroll processing method of the present invention merely by pressing and rolling a burnishing tool against side surfaces of spiral wraps, plurality of fine depressions having a desired shape and size can easily be processed in a regular arrangement. Because of this, by employing these fine depressions for holding oil, re-compression loss can be reduced by reducing refrigerant-gas leakage in the scroll compressor, the sliding loss can also be reduced by lowering the sliding friction coefficient, and thus, enhanced compression efficiency can be achieved.
  • this burnishing processing is a type of deformation processing for enhancing surface hardness, surface roughness, and so forth, and thus, durability, wear resistance, and so forth of the spiral wraps can also be enhanced by this processing.
  • FIG. 1 A first embodiment of the present invention will be described below by using Figs. 1 to 4 .
  • Fig. 1 is a longitudinal sectional view showing entirely a scroll compressor according to the first embodiment of the present invention
  • Fig. 2 is a plan view showing a fixed or an orbiting scroll, viewed from a spiral wrap side
  • Fig. 3 shows a sectional view thereof. Note that, although an example of a sealed-type electric scroll compressor for CO 2 -refrigerant will be described in this embodiment, the present invention is not limited thereto.
  • a scroll compressor 1 is provided with a sealed-type housing 2 using steal plate that is elongated in the top-to-bottom direction and that has a bottomed-cylinder shape.
  • a scroll compression mechanism (compression mechanism) 3 is installed at a top portion inside the sealed housing 2, and an electric motor 4 is installed at a bottom portion thereof.
  • the portion above the scroll compression mechanism 3 serves as a discharge chamber 5 to which high-pressure gas compressed by the scroll compression mechanism 3 is discharged, a discharge pipe 6 being connected to said discharge chamber.
  • the portion below the scroll compression mechanism 3 serves as an intake chamber 7 for taking in low-pressure intake gas, to which an intake pipe 8 is connected.
  • the electric motor 4, formed of a stator 9 and a rotor 10, is installed inside the sealed housing 2 on the intake-chamber 7 side by means of press fitting or the like, and a crankshaft 11 that is joined with the rotor 10 of the electric motor 4 extends in the top-to-bottom direction.
  • the bottom end of the crankshaft 11 is supported by a lower bearing 12 provided inside the sealed housing 2.
  • lubrication oil 14 that is filled in the bottom of the sealed housing 2 is supplied to required lubrication portions of the scroll compression mechanism 3 and a top bearing member 15 through oil supply holes (not shown) provided in the crankshaft 11 by means of a known oil-supply pump 13 provided between the bottom end of the crankshaft 11 and the lower bearing 12 so that these portions can be lubricated.
  • the scroll compression mechanism 3 is installed inside the sealed housing 2 via the top bearing member 15.
  • the scroll compression mechanism 3 is formed of a fixed scroll 16 that is securely installed on the top bearing member 15 and an orbiting scroll 20 that is supported on the top bearing member 15 so as to be capable of revolvingly orbiting about the fixed scroll 16.
  • the fixed scroll 16 is provided with a fixed end plate 17 and a fixed spiral wrap 18 that is vertically provided on one surface thereof, and a discharge port 19 is provided at a center portion of the fixed end plate 17.
  • the orbiting scroll 20 is provided with an orbiting end plate 21 and an orbiting spiral wrap 22 that is vertically provided on one surface thereof, and an orbiting boss 23 is integrally provided on the back face of the orbiting end plate 21.
  • a pair of compression chambers 24 are formed between the two scrolls 16 and 20 by engaging the fixed spiral wrap 18 and the orbiting spiral wrap 22 in a known manner so that the phases thereof are shifted 180°.
  • the pair of compression chambers 24 are configured so that with revolving of the orbiting scroll 20, gas is moved toward the center portion from an outer-circumferential position while decreasing in volume, thus achieving compression.
  • the back face of the orbiting end plate 21 is supported on a thrust bearing 15A of the top bearing member 15, and a crank pin 11A provided at the top end of the crankshaft 11 is joined with the orbiting boss 23 by means of a drive bush 25 and an orbiting bearing 26 that form a known passive crank mechanism, thereby configuring the orbiting scroll 20 so that it can be revolved about the fixed scroll 16 in an orbital manner, allowing to make the orbiting radius variable.
  • Rotation preventing means 27 formed of an Oldham ring or the like that prevents rotation of the orbiting scroll 20 on its axis is installed between the back face of the orbiting end plate 21 of the orbiting scroll 20 and the thrust bearing 15A of the top bearing member 15.
  • the top portion of the crankshaft 11 is supported by a journal bearing 15B of the top bearing member 15 in a freely rotatable manner.
  • a discharge cover 28 is provided on the back face thereof, and a reed-valve-type discharge valve 29 that opens and closes the discharge port 19 is also provided.
  • multiple pairs of relief ports 30 formed of multiple groups of holes that communicate between the compression chambers 24 and the discharge chamber 5 and relief valves 31 that open and close the ports 30 are provided at multiple locations at different orbiting-angle positions along the spiral direction of the fixed spiral wrap 18 on the outer-circumferential side.
  • this embodiment employs a configuration in which, in the scroll compressor 1 described above, as shown in Fig. 4 , numerous fine depressions (dimples) 32 are provided on side surfaces of the spiral wraps 18 and 22, such that the fine depressions are provided one or both of a ventral side (radially inside) surface 18A of the spiral wrap 18 of the fixed scroll 16 and a dorsal side (radially outside) surface 22A of the spiral wrap 22 of the orbiting scroll 20, and such that the fine depressions are provided one or both of a dorsal side (radially outside) surface 18B of the spiral wrap 18 of the fixed scroll 16 and a ventral side (radially inside) surface 22B of the spiral wrap 22 of the orbiting scroll 20, as shown in Figs. 2 to 4 .
  • the spiral wraps 18 and 22 are in sliding contact with each other.
  • Multiple rows of the fine depressions 32 are regularly arranged along the wrap-height direction in a staggered manner, and the shape thereof is a substantially elliptical shape elongated along the sliding direction (direction of the arrow), as shown in Fig. 4 .
  • the fine depressions 32 can be processed by pressing a burnishing tool 40, in which numerous rolling elements (balls) 41 that roll while vibrating are held at the outer circumferential surface thereof, against the side surfaces of the spiral wraps 18 and 22, and also by rolling it along the side surfaces of the spiral wraps 18 and 22 while rotating it.
  • a burnishing tool 40 in which numerous rolling elements (balls) 41 that roll while vibrating are held at the outer circumferential surface thereof, against the side surfaces of the spiral wraps 18 and 22, and also by rolling it along the side surfaces of the spiral wraps 18 and 22 while rotating it.
  • the fine depressions (dimples) 32 having a desired depth and size are processed on the spiral wraps 18 and 22 having a wrap height of 45 mm by rolling the burnishing tool 40, in which multiple rows of rolling-elements each having twelve rolling elements 41 arranged lengthwise are provided on the outer circumferential surface along the circumferential direction, while applying a pressing force of about 10 N (Newton) on each rolling element.
  • the burnishing tool 40 there are known tools such as those disclosed in the Publication of Japanese Patent No. 4575899 , and so forth.
  • this embodiment affords the following operational advantages.
  • low-pressure refrigerant gas (CO 2 refrigerant) is taken into the sealed housing 2 via the intake pipe 8, and this refrigerant gas is taken into the compression chambers 24 of the scroll compression mechanism 3 through a refrigerant flow path provided in the top bearing member 15 and so forth.
  • the orbiting scroll 20 is revolved about the fixed scroll 16 in a orbital manner, the refrigerant gas taken into the compression chambers 24 is compressed into high-temperature, high-pressure gas while the compression chamber 24 moves toward the center from outer circumferential positions of the compression mechanism 3 while decreasing in volume.
  • the compressed gas is discharged into the discharge chamber 5 via the discharge port 19 and the discharge valve 29 provided at the center portion of the fixed scroll 16 to be discharged outside the compressor via the discharge pipe 6 connected to the discharge chamber 5.
  • the relief valves 31 are opened so that the relief ports 30 communicate with the discharge chamber 5, and thus, the high-pressure gas or the liquid are released into the discharge chamber 5 through the relief ports 30.
  • the lubrication oil 14 that is filled in the bottom of the sealed housing 2 is supplied to the required lubrication portions of the scroll compression mechanism 3, the top bearing member 15, and so forth by means of the oil-supply pump 13, thus lubricating those portions.
  • a portion of this lubrication oil is taken into the compression chambers 24 along with the refrigerant gas to be supplied for sealing the compression chambers 24.
  • the compression chambers 24 are sealed by bringing tooth-tip surfaces of the spiral wraps 18 and 22 and tooth-bottom surfaces of the engaged scroll into contact, with the tip seal (not shown) interposed therebetween.
  • the side surfaces of the spiral wraps 18 and 22 of the two scrolls 16 and 20, that is, the predetermined pair of the ventral side surface 18A of the spiral wrap 18 of the fixed scroll 16 and the dorsal side surface 22A of the spiral wrap 22 of the orbiting scroll 20, and also the predetermied pair of the dorsal side surface 18B of the spiral wrap 18 of the fixed scroll 16 and the ventral side surface 22B of the spiral wrap 22 of the orbiting scroll 20 are in sliding contact with each other, so that this achieves sealing therebetween, thus suppressing leakage of compressed gas.
  • numerous fine depressions 32 are provided on one or both of the ventral side surface 18A of the spiral wrap 18 of the fixed scroll 16 and the dorsal side surface 22A of the spiral wrap 22 of the orbiting scroll 20, and the numerous fine depressions 32 are also provided on one or both of the dorsal side surface 18B of the spiral wrap 18 of the fixed scroll 16 and the ventral side surface 22B of the spiral wrap 22 of the orbiting scroll 20.
  • the lubrication oil 14 that has been taken into the compression chamber 24 along with the refrigerant gas, as described above, is held by means of numerous fine depressions 32 provided on the ventral side surfaces 18A, 22B and/or the dorsal side surfaces 18B, 22A of the spiral wraps 18 and 22 that are in sliding contact with each other, and thus, the oil 14 seals the sliding contact surfaces together, and the sliding friction coefficient due to the contact can be reduced at the same time.
  • re-compression loss can be reduced by reducing the internal leakage during the refrigerant-gas compression, the sliding loss can also be reduced by lowering the sliding friction coefficient, and thus, the compression efficiency of the scroll compressor 1 can be further enhanced.
  • the fine depressions 32 are formed as dimples elongated in the direction in which sliding occurs when the orbiting scroll 20 is revolved about the fixed scroll 16 in the orbital manner. In this way, by holding the oil in the dimples elongated in the sliding direction, it is possible to seal and lubricate a longer portion of the sliding contact surfaces of the spiral wraps 18 and 22 that move in association with the orbital driving of the orbiting scroll 20. Because of this, the reduction effects on re-compression loss and sliding loss can be further enhanced.
  • multiple rows of the fine depressions 32 are arranged in a staggered manner along the height direction of the spiral wraps 18 and 22. With these multiple rows of numerous fine depressions 32 arranged in a staggered manner, oil can be held substantially evenly over the entire areas of the ventral side surface 18A and the dorsal side surface 22A of the spiral wraps 18 and 22 that are in sliding contact with each other. As a result, the reduction effects on re-compression loss and sliding loss can be further enhanced.
  • numerous fine depressions 32 provided on the side surfaces of the spiral wraps 18 and 22 of the fixed scroll 16 and/or the orbiting scroll 20 described above can be processed in the ventral side surfaces 18A, 22B and/or the dorsal side surfaces 18B, 22A of the spiral wraps 18 and 22 by rotating, while pressing it against them, the burnishing tool 40, in which numerous rolling elements 41 that roll while vibrating are held in the outer circumferential surface thereof, so as todent the processed surfaces to form deformation thereof. Because of this, merely by pressing and rolling the burnishing tool 40 against the side surfaces of the spiral wraps 18 and 22, numerous fine depressions 32 having the desired shape and size can easily be processed in a regular arrangement.
  • this burnishing processing is a type of deformation processing for enhancing surface hardness, surface roughness, and so forth, and thus, durability, wear resistance, and so forth of the spiral wraps can also be enhanced by this processing.
  • This embodiment differs from the first embodiment described above.
  • stepped scrolls are employed as the fixed scroll 16 and the orbiting scroll 20. Because other points are the same as those of the first embodiment, descriptions thereof will be omitted.
  • step portions 33 and 34 are provided at the tooth-tip surfaces and tooth-bottom surfaces, respectively, and the wrap heights of portions closer to the outer circumference thereof relative to the step portions 33 and 34 are made higher than the wrap heights of portions closer to the inner circumference thereof relative to the step portions 33 and 34.
  • the stepped scroll compressor provided with the above-described step portions 33 and 34, it is not only possible to compress the refrigerant in the circumferential direction but also to compress it in the wrap-height direction. Accordingly, three-dimensional compression is possible, which increases the compression ratio as compared with an ordinary scroll compressor, and therefore size reduction and performance enhancement are possible. However, structurally, refrigerant leakage tends to occur at the step portions.
  • the fine depressions 32 are also provided on sliding contact surfaces of the step portions 33 and 34, as shown in Fig. 4 .
  • the fine depressions 32 are also provided on the sliding contact surfaces of the step portions 33 and 34 in addition to the ventral side surfaces 18A, 22B and/or the dorsal side surfaces 18B, 22A of the spiral wraps 18 and 22, and the sliding contact surface of each of the step portions 33 and 34 can also be sealed with oil by holding the oil in those fine depressions 32. Therefore, refrigerant leakage can effectively be reduced at the step portions 33 and 34, where, structurally, refrigerant leakage tends to occur, and thus, it is possible to further enhance the efficiency of a so-called stepped scroll compressor.
  • the present invention is not limited to the invention according to the embodiments described above, and appropriate modifications are permissible within a range that does not depart from the scope thereof.
  • the present invention is employed in a sealed-type electric scroll compressor have been described in the above-described embodiments, it is of course possible to employ the present invention similarly to an open scroll compressor whose power source is externally provided.
  • CO 2 -refrigerant scroll compressors have been described in the above-described embodiments
  • the present invention may naturally be employed in compressors using other refrigerants, such as HFC refrigerant or the like.
  • the present invention can also be employed in a multi-stage compressor or the like, and the present invention encompasses such a case so long as one of a plurality of compression mechanisms is a scroll compression mechanism.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Rotary Pumps (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)

Claims (5)

  1. Spiralverdichter, der einen Verdichtungsmechanismus (3) umfasst, der gebildet wird, indem eine Paarung aus einer feststehenden Spirale (16) und einer umkreisenden Spirale (20) in Eingriff gebracht wird, wobei in jeder von ihnen eine Spiralumwicklung (18, 22) vertikal auf einer Fläche einer Endplatte (17, 21) davon angeordnet ist, dadurch gekennzeichnet, dass
    mehrere feine Vertiefungen (32) auf einer oder auf beiden einer Seitenfläche (18A, 18B) der Spiralumwicklung (18) der feststehenden Spirale (16) und einer Seitenfläche (22A, 22B) der Spiralumwicklung (22) der umkreisenden Spirale (20) angeordnet sind, die in einem Gleitkontakt miteinander stehen, und dadurch, dass die feinen Vertiefungen (32) als Grübchen ausgebildet sind, die in einer Drehrichtung der umkreisenden Spirale (20), die in umkreisender Weise um die feststehende Spirale (16) herum gedreht wird, länglich sind.
  2. Spiralverdichter nach Anspruch 1, wobei mehrere Reihen der feine Vertiefungen (32) in einer gestaffelten Weise entlang der Höhenrichtung der Spiralumwicklungen (18, 22) angeordnet sind.
  3. Spiralverdichter nach Anspruch 1 oder 2, wobei
    sowohl die feststehende Spirale (16) als auch die umkreisende Spirale (20) auf der Umwicklungsoberseite und der Umwicklungsunterseite ihrer Spiralumwicklung (18, 22) mit einem Stufenabschnitt (33, 34) versehen sind, und die Höhe einer jeden der Spiralumwicklungen (18, 22) an einem Abschnitt, der relativ zu dem Stufenabschnitt näher an ihrem Außenumfang liegt, höher ausgelegt ist als an einem Abschnitt, der relativ zu dem Stufenabschnitt näher an ihrem Innenumfang liegt, und
    die feinen Vertiefungen (32) ebenfalls auf einer Gleitkontaktfläche eines jeden der Stufenabschnitte angeordnet sind.
  4. Spiralverdichter nach einem der Ansprüche 1 bis 3, wobei der Spiralverdichter ein CO2-Kältemittelverdichter für ein superkritisches Zyklussystem ist, das mit CO2-Kältemittel arbeitet.
  5. Spiralbearbeitungsverfahren zum Bilden mehrerer feiner Vertiefungen (32) an einer Seitenfläche (18A, 18B, 22A, 22B) einer Spiralumwicklung (18, 22) von einer oder beiden einer feststehenden Spirale (16) und einer umkreisenden Spirale (20), die einen Spiralverdichter bilden,
    wobei die feinen Vertiefungen (32) an den Seitenflächen (18A, 18B, 22A, 22B) der Spiralumwicklungen (18, 22) bearbeitet werden, indem ein Polierwerkzeug (40), das mehrere Rollenelemente aufweist, die, während sie vibrieren, an deren Umfangsfläche entlang rollen, so gegen die Seitenflächen (18A, 18B, 22A, 22B) der Spiralumwicklungen (18, 22) gedrückt und gedreht wird, dass die bearbeiteten Flächen eingedrückt werden, um die Verformungen zu bilden,
    wobei die feinen Vertiefungen (32) als Grübchen ausgebildet werden, die in einer Umdrehungsrichtung der umkreisenden Spirale (20), die in umkreisender Weise um die feststehende Spirale (16) gedreht wird, länglich sind.
EP13154305.0A 2012-02-10 2013-02-07 Spiralverdichter und Spiralverarbeitungsverfahren Active EP2626561B1 (de)

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JP2012027421 2012-02-10
JP2013012155A JP6214875B2 (ja) 2012-02-10 2013-01-25 スクロール圧縮機およびそのスクロールの加工方法

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WO2023187903A1 (ja) * 2022-03-28 2023-10-05 三菱電機株式会社 バニシング加工工具、バニシング加工装置、ワーク、スクロール圧縮機用スクロール、及び、バニシング加工方法

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JPS63272981A (ja) * 1986-11-27 1988-11-10 Inoue Japax Res Inc スクロ−ルポンプ
JP4468157B2 (ja) * 2004-12-22 2010-05-26 三菱重工業株式会社 スクロール型圧縮機及び空気調和装置
US8118577B2 (en) * 2007-01-30 2012-02-21 Mitsubishi Heavy Industries, Ltd. Scroll compressor having optimized cylinder oil circulation rate of lubricant
JP4661801B2 (ja) * 2007-02-28 2011-03-30 株式会社デンソー スクロール型圧縮機およびその製造方法
JP5261135B2 (ja) * 2008-10-29 2013-08-14 株式会社スギノマシン ディンプル形成バニシング工具及びディンプル形成方法

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