EP3363991B1 - Sliding member of compressor and compressor having the same - Google Patents

Sliding member of compressor and compressor having the same Download PDF

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Publication number
EP3363991B1
EP3363991B1 EP18156470.9A EP18156470A EP3363991B1 EP 3363991 B1 EP3363991 B1 EP 3363991B1 EP 18156470 A EP18156470 A EP 18156470A EP 3363991 B1 EP3363991 B1 EP 3363991B1
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EP
European Patent Office
Prior art keywords
compressor
coating
sliding member
refrigerant
scroll
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
EP18156470.9A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3363991A1 (en
EP3363991C0 (en
Inventor
Hajime Sato
Yoshiyuki Kimata
Yougo Takasu
Kazuki Takahashi
Taichi Tateishi
Takuma YAMASHITA
Akihiro KANAI
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Thermal Systems Ltd
Original Assignee
Mitsubishi Heavy Industries Thermal Systems Ltd
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Publication of EP3363991A1 publication Critical patent/EP3363991A1/en
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Publication of EP3363991B1 publication Critical patent/EP3363991B1/en
Publication of EP3363991C0 publication Critical patent/EP3363991C0/en
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Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
    • F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
    • F04C18/0215—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form where only one member is moving
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • 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
    • F01C21/08—Rotary pistons
    • F01C21/0809—Construction of vanes or vane holders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
    • F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
    • F04B27/0873—Component parts, e.g. sealings; Manufacturing or assembly thereof
    • F04B27/0878—Pistons
    • F04B27/0886—Piston shoes
    • 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
    • F04C18/30—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C18/34—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members
    • F04C18/344—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
    • 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
    • F04C2230/91—Coating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2201/00—Metals
    • F05C2201/90—Alloys not otherwise provided for
    • F05C2201/903—Aluminium alloy, e.g. AlCuMgPb F34,37
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2203/00—Non-metallic inorganic materials
    • F05C2203/08—Ceramics; Oxides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2251/00—Material properties
    • F05C2251/10—Hardness

Definitions

  • the present invention relates to a sliding member of a compressor which reciprocates in a refrigerant atmosphere, in the field of air conditioners.
  • a key member of an Oldham's coupling As a member supporting an orbiting scroll such that the orbiting scroll can orbit to revolve with respect to a fixed scroll fixed to a casing of an air conditioner with the orbiting scroll combined with the fixed scroll, there is a key member of an Oldham's coupling.
  • the key member is supported so as to be able to reciprocate in a certain radial direction in an orbiting plane with respect to a base which holds the orbiting scroll, and supports the orbiting scroll such that the orbiting scroll can reciprocate with respect to itself in another direction orthogonal to the certain radial direction in the orbiting plane. In this way, in the orbiting scroll, only revolution is allowed with respect to the fixed scroll while rotation is prevented.
  • the key member of the Oldham's coupling is a sliding member which reciprocates in a certain radial direction in an orbiting plane with respect to a casing which is fixed to the fixed scroll and reciprocates in another direction orthogonal to the certain radial direction with respect to the orbiting scroll.
  • the key member as such a sliding portion reciprocates, and therefore, vibration easily occurs compared to a member which rotates. Therefore, in order to reduce an inertial force which causes vibration, a casting having a body made of a light metal alloy such as an aluminum alloy, for example, is used, and an abrasion-resistant coating is formed on the surface thereof by alumite treatment, tin plating treatment, or the like.
  • a sliding member for a compressor according to the preamble of claim 1 is disclosed in EP 1 314 887 A2 .
  • a further sliding member for a compressor is disclosed in US 5,024,591 A .
  • WO 2016/042218 A1 and WO 2009/055009 A2 disclose scroll compressors.
  • EP 2819716 discloses a sliding member in a refrigerant compressor for use with a refrigerator or an air conditioner.
  • the present invention has been made in view of the above circumstances and has an object to provide a sliding member of a compressor which reciprocates in a refrigerant atmosphere, which is resistant to abrasion even in an area where a sliding speed becomes slower, and has excellent durability.
  • a sliding member for a compressor according to the present invention includes: a body formed of an aluminum alloy; and a first coating having abrasion resistance and formed on a surface of the body, in which a Vickers hardness value of the first coating is 500 or more.
  • the first coating is a ceramic coating formed on the surface of the body.
  • a thickness of the first coating may be 20 ⁇ m or less.
  • the sliding member according to the present invention further includes: a second coating formed on the body so as to overlap the first coating and having self-lubricity.
  • the second coating is softer than the ceramic coating and is formed of one selected from a fluorine resin, a molybdenum disulfide, a carbon-based composite material, a boron nitride, or a tungsten disulfide-based material.
  • a compressor according to the present invention has the sliding member described above, and a support member for supporting the sliding member so as to be capable of reciprocating.
  • the compressor according to the present invention may be a scroll type compressor including: a fixed scroll; an orbiting scroll coupled with the fixed scroll; and a key member provided between the fixed scroll and the orbiting scroll to form an Oldham's coupling along with both the scrolls, and supporting the orbiting scroll so that the orbiting scroll can orbit with respect to the fixed scroll, in which the key member is the above-described sliding member.
  • a compressor according to the present invention may be a rotary type compressor including: a cylindrical housing; a rotor being rotatable inside the housing; and a pair of vanes supported by the rotor so as to be capable of reciprocating in a radial direction of the rotor, and being pressed onto an inner surface of the housing by a spring disposed in the rotor, in which each of the vanes is the above-described sliding member.
  • a compressor according to the present invention may be a reciprocal type compressor including: a cylinder; a piston disposed in the cylinder so as to be in contact with an inner surface of the cylinder; and a piston rod connected with the piston and supporting the piston such that the piston can reciprocate in a longitudinal direction of the cylinder, in which the piston is the above-described.
  • An air-conditioning system includes: a compressor for compressing a gaseous refrigerant; a condenser for condensing the gaseous refrigerant compressed by the compressor to release heat from the gaseous refrigerant; an expansion valve for expanding a liquid refrigerant liquefied by the condenser to reduce the pressure of the liquid refrigerant; and an evaporator for evaporating the liquid refrigerant expanded by the expansion valve to absorb heat of the liquid refrigerant, in which the compressor, the condenser, the expansion valve, and the evaporator are installed on a refrigerant tubing so as to be connected in sequence, the refrigerant as a heat-transfer medium is circularly transferred between the condenser and the evaporator through the refrigerant tubing to perform air-conditioning, and a sliding member in the compressor is the above-described sliding member.
  • the above-described member is adopted as a sliding member in a compressor, whereby the member is not easily worn even in an area where a sliding speed specific to a reciprocating member becomes slower, and thus the durability is improved.
  • Such improvement in abrasion resistance makes it possible to maintain the soundness of the compressor for a long period of time even in a case where a compressor is operated in a very severe lubricating state or refrigerating machine oil having low viscosity has to be adopted due to design restrictions, and accordingly, it is possible to realize a longer life of an air-conditioning system which includes the compressor.
  • the invention is as defined in claim 1.
  • FIG 1 is an exploded perspective view showing a fixed scroll, an orbiting scroll, and a key member configuring an Oldham's coupling along with both the scrolls, which are main components of a scroll type compressor according to the present invention.
  • a scroll type compressor which includes a sliding member not according to the present invention will be described hereinafter as useful example for understanding the invention.
  • a scroll type compressor 1 is provided with a fixed scroll 2, an orbiting scroll 3, a key member (a sliding member) 4 configuring an Oldham's coupling along with both the scrolls, and a base 5.
  • the fixed scroll 2 has an end plate 2a and a spiral protrusion 2b formed on the surface on one side of the end plate 2a.
  • the orbiting scroll 3 has an end plate 3a and a spiral protrusion 3b formed on the surface on one side of the end plate 3a.
  • the spiral protrusion 3b of the orbiting scroll 3 has substantially the same shape as the spiral protrusion 2b of the fixed scroll 2.
  • the key member 4 has an annular portion 4a which is disposed so as to be able to orbit around the spiral protrusions 2b and 3b, a pair of engaging protrusions 4b and 4b formed on the surface on one side of the annular portion 4a, and a pair of engaging protrusions 4c and 4c formed on the surface on the other side of the annular portion 4a.
  • the engaging protrusions 4b and 4b are formed at positions spaced apart from each other in a diameter direction of the annular portion 4a on the surface on one side of the annular portion 4a.
  • the engaging protrusions 4c and 4c are formed at positions spaced apart from each other in the diametrical direction and shifted from the engaging protrusions 4b and 4b by 90° on the surface on the other side of the annular portion 4a.
  • the engaging protrusions 4b and 4b of the key member 4 are fitted into guide grooves 2c and 2c formed on the surface on one side of the fixed scroll 2.
  • the guide grooves 2c and 2c are formed at positions spaced apart from each other in the diametrical direction of the end plate 2a with the spiral protrusion 2b interposed therebetween, and the key member 4 is supported so as to be able to reciprocate in the diameter direction of the fixed scroll 2 along the guide grooves 2c and 2c with respect to the fixed scroll 2.
  • the engaging protrusions 4c and 4c of the key member 4 are fitted into guide grooves 5a and 5a formed on the surface on one side of the base 5 on the orbiting scroll 3 side.
  • the guide grooves 5a and 5a are formed at positions spaced apart from each other in the diametrical direction of the base 5 with the spiral protrusion 3b interposed therebetween, and the key member 4 is supported so as to be able to reciprocate in the diameter direction of the orbiting scroll 3 along the guide grooves 5a and 5a with respect to the base 5 on the orbiting scroll 3 side.
  • the reciprocating direction of the key member 4 with respect to the orbiting scroll 3 is different by 90° from the reciprocating direction of the key member 4 with respect to the fixed scroll 2. In this way, in the orbiting scroll 3, only revolution is allowed with respect to the fixed scroll 2 while rotation is prevented.
  • the spiral protrusions 2b and 3b of both the scrolls mesh with each other, so that a plurality of arcuate compression cells are defined between the wall faces of the spiral protrusions 2b and 3b.
  • the compression cells move while decreasing the volume toward the center of the spiral due to the orbiting motion of the orbiting scroll 3.
  • the scroll type compressor 1 adiabatically compresses a refrigerant introduced into the compression cells by utilizing a decrease in volume associated with the orbiting motion of the orbiting scroll 3.
  • An air-conditioning system which includes the scroll type compressor 1 is provided with a condenser 12, an expansion valve 13, and an evaporator 14, as shown in FIG 2 , for example, and the respective elements are connected in sequence through a refrigerant tubing 15 through which a refrigerant flows.
  • the condenser 12 condenses and liquefies a high-temperature and high-pressure gaseous refrigerant to release heat from the gaseous refrigerant
  • the expansion valve 13 adiabatically expands a high-temperature and high-pressure liquid refrigerant obtained by being liquefied by the condenser 12, to reduce the pressure of the liquid refrigerant
  • the evaporator 14 evaporates and vaporizes a low-temperature and low-pressure liquid refrigerant expanded by the expansion valve 13, to absorb heat of the liquid refrigerant
  • the compressor 1 adiabatically compresses a low-temperature and low-pressure gaseous refrigerant which has passed through the evaporator 14.
  • the high-temperature and high-pressure gaseous refrigerant compressed by the compressor 1 is supplied to the condenser 12.
  • the refrigerant as a heat-transfer medium is circulated in the closed system in this manner, whereby movement of heat from the evaporator 14 to the condenser 12 is realized to enable air conditioning (heating and cooling) in a room.
  • Lubricating oil of the scroll type compressor circulates in the air-conditioning system which includes the evaporator, the expansion valve, and the condenser in a state of being mixed with the refrigerant, and returns to the compressor.
  • Lubricating oil of the air-conditioning system is first used without being replaced for a period in which the air-conditioning system is used, in a state of being sealed in the system together with the refrigerant
  • the key member 4 of this example has a body 10 made of an aluminum alloy, and a ceramic coating (a first coating) 11 having abrasion resistance and formed on the surface of the body 10.
  • the body 10 is a casted body made of an aluminum alloy, and has relatively rough irregularities formed on the surface thereof.
  • the ceramic coating 11 is formed on the surface, whereby the irregularities on the surface of the body 10 are suppressed.
  • the Vickers hardness value of the ceramic coating 11 is 500 or more and more preferably 700 or more. If the Vickers hardness value of the ceramic coating 11 is smaller than 500, the difference in hardness between the ceramic coating 11 and a member that is a rubbing partner is small, and therefore, under a condition where a lubrication state is severe, there is a possibility that the abrasion of the ceramic coating 11 may progress. However, if the Vickers hardness value of the ceramic coating 11 is 500 or more, the difference in hardness between the ceramic coating 11 and the mating member is sufficient, and therefore, even under a condition where a lubrication state is severe, it becomes possible to suppress abrasion of the ceramic coating 11.
  • the ceramic coating 11 be formed to a thickness of 20 ⁇ m or less. If the thickness of the ceramic coating 11 is larger than 20 ⁇ m), the surface roughness after film formation treatment increases (the surface becomes rough), and therefore, if the compressor is operated with the parts assembled directly, abrasion of the mating member progresses because a sliding surface becomes rough. In order to prevent the progress of such abrasion, it is necessary to additionally polish the surface to reduce the surface roughness to a specified value or less. Further, in order to increase the film thickness, it is necessary to lengthen a time required for the film formation treatment, and thus the cost of the film formation treatment increases. Further, there is also a problem in that the coating easily peels off.
  • the electrolytic ceramic coating method disclosed in, for example, Japanese Patent No. 5345115 .
  • light metal such as aluminum, magnesium, or titanium or an alloy thereof is used as an anode and anodic oxidation treatment is performed on the surface thereof.
  • a hard ceramic coating is formed on the surface of the light metal or the alloy thereof as an object to be treated, while accompanying plasma emission.
  • the key member 4 is supported so as to be able to reciprocate in a certain radial direction (that is, a direction connecting the two protrusions 4b and 4b) in an orbiting plane of the orbiting scroll 3 with respect to the fixed scroll 2, and supports the orbiting scroll 3 such that the orbiting scroll 3 can reciprocate with respect to itself in a direction (that is, a direction connecting the two protrusions 4c and 4c) orthogonal to the certain radial direction in the orbiting plane. In this way, in the orbiting scroll 3, only revolution is allowed with respect to the fixed scroll 2 while rotation is prevented.
  • the key member 4 reciprocates in each of two directions orthogonal to each other in the orbiting plane, unlike a member which rotates, such as a shaft which drives the orbiting scroll 3, and there are points (so-called “dead points") at which a speed becomes zero at both ends of a reciprocating area thereof.
  • dead points points at which a speed becomes zero at both ends of a reciprocating area thereof.
  • the speed of the key member 4 when the key member 4 slides with respect to the base 5 becomes extremely slow and the speed when the key member 4 slides with respect to the orbiting scroll 3 also becomes extremely slow.
  • the lubricating condition of a sliding portion becomes severe compared to a member which rotates at a substantially constant speed.
  • the refrigerant used as a heat-transfer medium is an HFC-based refrigerant such as R410A, R134A, R407C, or R32 (in the future, use of a CO 2 refrigerant, a HFO refrigerant, or the like is also studied).
  • lubricating oil used in accordance with these refrigerants is refrigerating machine oil which is compatible with the refrigerant, such as POE, PVE, or PAG, for example.
  • the lubricating of the key member 4 is generally considered to depend on a change in an operating state of a scroll type compressor.
  • a scroll type compressor usually, there is a possibility of falling into the following states during an operation.
  • the speed of the reciprocating motion of the key member 4 in two directions also decreases. Further, if the temperature of the refrigerant flowing in a sliding portion of the key member 4 between the key member 4 and the base 5 and the surroundings thereof, and a sliding portion of the key member 4 between the key member 4 and the orbiting scroll 3 and the surroundings thereof rises and approaches the state of the above (2), the viscosity of the refrigerating machine oil existing together with the refrigerant decreases.
  • the lubricating of the key member 4 is also considered to depend on a change in the properties of the refrigerant and the refrigerating machine oil.
  • a refrigerant and refrigerating machine oil which exhibit the following properties are generally used.
  • the R32 refrigerant not only has a lower viscosity grade but also becomes higher in temperature than other refrigerants under the use condition in the air-conditioning system, and therefore, a decrease in viscosity is more remarkable than others.
  • the HFC-based refrigerant which is widely used at present is premised on use under a higher pressure than the CFC-based or HCFC-based refrigerant used previously, and therefore, in order to secure the liquid tightness of the compression cell in the machine, the surface pressure between both the scrolls is set to be higher than that in the compressor of the related art, which uses the CFC-based or HCFC-based refrigerant In this manner, even in a case where the surface pressure between both the scrolls is set to be high, in the above-described scroll type compressor in which the ceramic coating 11 is formed on the surface of the key member 4 and the coefficient of friction is kept low, the surface of the key member 4 is hardly worn, and thus the durability of the key member 4 is improved. In this way, it is possible to maintain the soundness of the compressor for a long period of time and extend the life of the air-conditioning system which includes the compressor.
  • the ceramic coating is adopted as a first coating having abrasion resistance.
  • DLC diamond-like carbon
  • the example has been described with the key member 4 as the sliding member.
  • a configuration may be adopted in which a member on the side supporting the key member 4, that is, the fixed scroll 2 of the orbiting scroll 3, is set as the sliding member according to the above example and a hard film such as a ceramic coating is formed as a first coating on at least a portion which is in contact with the key member 4.
  • a rotary type compressor 30 shown in FIG 4 is provided with a cylindrical housing 31, a rotor 32 which rotates in the housing 31, and a pair of vanes 34 and 34 supported by the rotor 32 so as to be able to reciprocate in a radial direction of the rotor and pressed onto the inner surface of the housing 31 by a spring 33 disposed in the rotor 32.
  • a compression cell C is defined between the inner surface of the housing 31, the outer surface of the rotor 32, and the vanes 34 and 34 which slide along a groove of the rotor 32 and are pressed onto the inner surface of the housing 31, a refrigerant in the cell is compressed in a process in which the volume of the cell increases, and the compressed refrigerant in the cell is discharged in a process in which the volume of the compression cell C decreases.
  • the sliding member according to the present invention is adopted for each of the pair of vanes 34 and 34 (or the inner surface of the groove on the rotor side, which accommodates the vanes), whereby the sliding between the rotor 32 and the vane 34 is smoothed, and thus it is possible to maintain the soundness of the compressor for a long period of time.
  • a reciprocal type compressor 40 shown in FIG 5 is provided with a cylinder 41, a piston 42 disposed so as to be in contact with the inner surface of the cylinder 41, and a piston rod 43 which is connected to the piston 42 and makes the piston reciprocate inside the cylinder 41 in a longitudinal direction of the cylinder.
  • the piston 42 reciprocates inside the cylinder 41, a refrigerant is sucked into the cylinder 41 in a process in which the piston 42 is drawn out from the cylinder 41, and in a process in which the piston 42 is pushed into the cylinder 41, the refrigerant is compressed and the compressed refrigerant is discharged from the cylinder 41.
  • the sliding member according to the present invention is adopted for the piston 42 (or the inner surface of the cylinder 41), whereby the sliding between the inner surface of the cylinder and the piston is smoothed, and thus it is possible to maintain the soundness of the compressor for a long period of time.
  • a key member 20 of an Oldham's coupling has the body 10 made of a light alloy of aluminum, titanium, magnesium, or the like, the ceramic coating 11 formed on the surface of the body 10, and a fluorine resin coating (a second coating) 21 formed on the surface of the ceramic coating 11 so as to overlap the ceramic coating 11 and having self-lubricity.
  • Teflon registered trademark
  • Teflon is used as a fluorine resin configuring the coating 21.
  • the surface shape of the ceramic coating 11 is reflected in the surface of the key member 20 almost as is, and thus some irregularities remain on the surface of the key member 20.
  • the fluorine resin coating 21 is superior in self-lubricity and is softer than the ceramic coating 11, and therefore, while the scroll type compressor is operated, as shown in FIG 7 , the fluorine resin coating 21 placed on the convex portion of the ceramic coating 11 is gradually scraped off, and finally, a state where the fluorine resin coating 21 remains in only the concave portion of the ceramic coating 11 is created, so that the surface of the key member 20 becomes smooth without irregularities.
  • the fluorine resin coating is adopted as the second coating having self-lubricity.
  • a molybdenum disulfide coating can be mentioned as a material which is expected to be used as the second coating. Even if, instead of the fluorine resin coating, the molybdenum disulfide coating is formed on the ceramic coating 11 so as to overlap the ceramic coating 11, the same effects as those described above are obtained. Further, in addition to this, a graphite-based material (a carbon-based composite material), boron nitride, or a tungsten disulfide-based material can be used as the second coating.
  • the present invention relates to a sliding member of a compressor which is provided with a body made of light metal or an alloy thereof, and a first coating having abrasion resistance and formed on a surface of the body, in which the Vickers hardness value of the first coating is 500 or more, and a compressor having the sliding member.
  • the sliding member is adopted for a compressor, even in a case where the compressor is operated in a very severe lubricating state or low viscosity refrigerating machine oil has to be adopted due to design restrictions, the surface of the sliding member is hardly worn, and thus it is possible to improve the durability of the sliding member.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Manufacturing & Machinery (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Compressor (AREA)
EP18156470.9A 2017-02-15 2018-02-13 Sliding member of compressor and compressor having the same Active EP3363991B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2017025952A JP6967353B2 (ja) 2017-02-15 2017-02-15 空気調和装置、及び空調システム

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EP3363991A1 EP3363991A1 (en) 2018-08-22
EP3363991B1 true EP3363991B1 (en) 2024-05-08
EP3363991C0 EP3363991C0 (en) 2024-05-08

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JP (1) JP6967353B2 (ja)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2818716A1 (en) * 2012-02-20 2014-12-31 Panasonic Corporation Sliding member and refrigerant compressor using same, refrigerator, and air conditioner

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EP3363991A1 (en) 2018-08-22
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JP6967353B2 (ja) 2021-11-17

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