WO2020195490A1 - 密閉型圧縮機および冷凍サイクル装置 - Google Patents

密閉型圧縮機および冷凍サイクル装置 Download PDF

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Publication number
WO2020195490A1
WO2020195490A1 PCT/JP2020/007807 JP2020007807W WO2020195490A1 WO 2020195490 A1 WO2020195490 A1 WO 2020195490A1 JP 2020007807 W JP2020007807 W JP 2020007807W WO 2020195490 A1 WO2020195490 A1 WO 2020195490A1
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WIPO (PCT)
Prior art keywords
roller
blade
cylinder chamber
wear
dlc film
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.)
Ceased
Application number
PCT/JP2020/007807
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English (en)
French (fr)
Japanese (ja)
Inventor
将平 跡部
哲永 渡辺
青木　俊公
忠之 山崎
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Carrier Japan Corp
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Toshiba Carrier Corp
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Filing date
Publication date
Application filed by Toshiba Carrier Corp filed Critical Toshiba Carrier Corp
Priority to JP2021508842A priority Critical patent/JP7171892B2/ja
Priority to EP20776408.5A priority patent/EP3951176B1/en
Priority to CN202080023834.8A priority patent/CN113646533B/zh
Publication of WO2020195490A1 publication Critical patent/WO2020195490A1/ja
Anticipated expiration legal-status Critical
Priority to JP2022173490A priority patent/JP7532472B2/ja
Ceased legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • C01B32/05—Preparation or purification of carbon not covered by groups C01B32/15, C01B32/20, C01B32/25, C01B32/30
    • 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
    • C21D5/00—Heat treatments of cast-iron
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • C22C37/04—Cast-iron alloys containing spheroidal graphite
    • 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
    • F04C18/356—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 outer member
    • F04C18/3562—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 outer member the inner and outer member being in contact along one line or continuous surfaces substantially parallel to the axis of rotation
    • 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
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/004—Dispersions; Precipitations
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/38—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for roll bodies
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • 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
    • 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
    • F05C2201/04—Heavy metals
    • F05C2201/0433—Iron group; Ferrous alloys, e.g. steel
    • F05C2201/0436—Iron
    • F05C2201/0439—Cast iron
    • 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

  • An embodiment of the present invention relates to a closed compressor and a refrigeration cycle device.
  • a closed compressor is incorporated in the refrigeration cycle equipment such as air conditioners, refrigerators, refrigeration showcases, and heat pump water heaters that cool and heat the room, and refrigerants such as HFC-based refrigerants or natural refrigerants such as HC-based and CO 2 are used. To circulate.
  • the closed compressor includes a closed container, an electric motor unit housed in the closed container, and a compression mechanism unit connected to the electric motor unit via a rotating shaft.
  • a cylinder is provided in the compression mechanism portion.
  • a roller is arranged in the cylinder, and the tip of the blade is elastically brought into contact with the peripheral surface of the roller. When the roller is driven by the electric motor unit via the shaft and rotates, the roller and the blade slide. Since these sliding members slide against each other, it is required to improve the wear resistance of their sliding surfaces.
  • Japanese Patent No. 5113902 discloses a closed compressor provided with a compression mechanism. At least one of the sliding members of the compression mechanism, such as the blade, is made of tool steel. On the sliding surface of the tip of the blade with the roller, a single layer of chromium, a layer of chromium and tungsten carbide alloy, an amorphous carbon layer containing tungsten, and amorphous carbon containing carbon and hydrogen without containing metal. The layers are laminated in this order from the surface of the base material of the tool steel.
  • the sealed compressor described in the above-mentioned publication may not be able to sufficiently secure wear resistance if one-sided contact occurs, for example, when sliding the roller and the blade.
  • wear resistance can be ensured even in a sliding environment in which a first member and a second member sliding on each other of the compression mechanism portion, for example, a blade and a roller are in a one-sided contact state.
  • a possible sealed compressor and a refrigeration cycle device equipped with the compressor are provided.
  • the closed compressor includes a compression mechanism for compressing the refrigerant and refrigerating machine oil in a closed container.
  • the compression mechanism portion includes a first member and a second member that slide with each other.
  • the first member has a diamond-like carbon film on the surface of a base material made of an iron-based metal.
  • the second member is formed of cast iron to which magnesium is added, the amount of carbides deposited on the sliding surface with the first member is 5% or less in terms of area ratio, and the Rockwell hardness (HRC) is 40 or more and 55 or less. Is.
  • FIG. 1 is a schematic view showing a refrigeration cycle device according to an embodiment.
  • FIG. 2 is a perspective view showing a second roller and a blade of the second cylinder chamber of FIG.
  • FIG. 3 is a diagram showing the relationship between the amount of carbide deposited on the sliding surface of the roller with the blade and the amount of wear of the diamond-like carbon film (DLC film) of the blade when the roller and the blade are slid in the first embodiment. is there.
  • FIG. 4 is a diagram showing the relationship between the change in the lockwell hardness (HRC) of the roller, the amount of wear of the roller, and the amount of wear of the DLC film of the blade when the roller and the blade in the second embodiment are slid.
  • HRC lockwell hardness
  • FIG. 5 is a diagram showing changes in the amount of wear of the coating film of the blade when the roller and the blade are slid in Example 3 and Comparative Examples 1 and 2.
  • FIG. 6 is a diagram showing the relationship between the content of the extreme pressure additive in the refrigerating machine oil and the amount of wear of the DLC film of the blade in Example 5.
  • FIG. 1 is a schematic view showing a refrigeration cycle device 1 according to an embodiment.
  • the refrigeration cycle device 1 includes a closed compressor 2, a condenser 3, an expansion device 4, and an evaporator 5.
  • the refrigerant is circulated from the discharge side of the closed compressor 2 to the suction side of the closed compressor 2 via the condenser 3, the expansion device 4, the evaporator 5, and the accumulator 6.
  • the closed compressor 2 is, for example, a vertical rotary compressor, and includes a closed container 10, a compression mechanism portion 11, and an electric motor portion 12 as main components.
  • the closed container 10 has a cylindrical peripheral wall 10a and stands up along the vertical direction.
  • a discharge pipe 10b is provided at the upper end of the closed container 10.
  • the discharge pipe 10b is connected to the condenser 3.
  • an oil sump portion 10c for storing the refrigerating machine oil I for lubricating the compression mechanism portion 11 is provided in the lower part of the closed container 10.
  • the compression mechanism portion 11 is housed in the lower part of the closed container 10 so as to be immersed in the refrigerating machine oil I.
  • the compression mechanism portion 11 has a twin-type cylinder structure, and has a first cylinder 13, a second cylinder 14, a rotating shaft (shaft) 15, a first roller 16, a second roller 17, and a first blade.
  • the 30a and the second blade 30b are provided as main components.
  • the first cylinder 13 is fixed to the inner peripheral surface of the peripheral wall 10a of the closed container 10.
  • the second cylinder 14 is fixed to the lower surface of the first cylinder 13 via an intermediate partition plate 18.
  • the first bearing 20 is fixed to the upper surface of the first cylinder 13.
  • the first bearing 20 covers the inner diameter portion of the first cylinder 13 from above and protrudes upward toward the first cylinder 13.
  • the space surrounded by the inner diameter portion of the first cylinder 13, the intermediate partition plate 18, and the first bearing 20 constitutes the first cylinder chamber 21.
  • the intermediate partition plate 18 and the first bearing 20 are closing members of the first cylinder chamber 21.
  • the second bearing 22 is fixed to the lower surface of the second cylinder 14.
  • the second bearing 22 covers the inner diameter portion of the second cylinder 14 from below, and projects downward toward the lower side of the second cylinder 14.
  • the space surrounded by the inner diameter portion of the second cylinder 14, the intermediate partition plate 18, and the second bearing 22 constitutes the second cylinder chamber 23.
  • the intermediate partition plate 18 and the second bearing 22 are closing members of the second cylinder chamber 23.
  • the first cylinder chamber 21 and the second cylinder chamber 23 are located coaxially with the central axis O1 of the closed container 10.
  • the first cylinder chamber 21 and the second cylinder chamber 23 are connected to the accumulator 6 via suction pipes 25a and 25b.
  • the gas phase refrigerant separated from the liquid phase refrigerant by the accumulator 6 is guided to the first cylinder chamber 21 and the second cylinder chamber 23 through the suction pipes 25a and 25b.
  • the rotating shaft 15 is coaxially located on the central axis O1 of the closed container 10 and penetrates the first cylinder chamber 21, the second cylinder chamber 23, and the intermediate partition plate 18.
  • the rotating shaft 15 has a first journal portion 27a, a second journal portion 27b, and a pair of eccentric portions 28a, 28b.
  • the first journal portion 27a is rotatably supported by the first bearing 20.
  • the second journal portion 27b is rotatably supported by the second bearing 22.
  • the rotating shaft 15 has a connecting portion 27c coaxially extended from the first journal portion 27a.
  • the rotor 33 of the electric motor unit 12 is fixed to the connecting portion 27c.
  • the eccentric portions 28a and 28b are located between the first journal portion 27a and the second journal portion 27b.
  • the eccentric portions 28a and 28b have a phase difference of, for example, 180 degrees, and the amount of eccentricity with respect to the central axis O1 of the closed container 10 is the same as each other.
  • One eccentric portion 28a is housed in the first cylinder chamber 21.
  • the other eccentric portion 28b is housed in the second cylinder chamber 23.
  • the ring-shaped first roller 16 is fitted to the outer peripheral surface of one of the eccentric portions 28a.
  • the first roller 16 rotates eccentrically in the first cylinder chamber 21 when the rotation shaft 15 rotates, and a part of the outer peripheral surface of the first roller 16 is the inner peripheral surface of the first cylinder chamber 21. Sliding line contact through the oil film.
  • the ring-shaped second roller 17 is fitted to the outer peripheral surface of the other eccentric portion 28b.
  • the second roller 17 rotates eccentrically in the second cylinder chamber 23 when the rotation shaft 15 rotates, and a part of the outer peripheral surface of the second roller 17 is the inner peripheral surface of the second cylinder chamber 23. Sliding line contact through the oil film.
  • the first blade 30a is supported by the first cylinder 13.
  • the tip of the first blade 30a is slidably pressed against the outer peripheral surface of the first roller 16.
  • the first blade 30a cooperates with the first roller 16 to partition the first cylinder chamber 21 into a suction region and a compression region. Further, the first blade 30a follows the eccentric movement of the first roller 16 and moves in a direction of protruding into the first cylinder chamber 21 or moving out of the first cylinder chamber 21.
  • the volumes of the suction region and the compression region of the first cylinder chamber 21 are changed, and the vapor-phase refrigerant sucked from the suction pipe 25a into the first cylinder chamber 21 is compressed. Cylinder.
  • the second blade 30b is supported by the second cylinder 14.
  • the tip of the second blade 30b is slidably pressed against the outer peripheral surface of the second roller 17. Since the second blade 30b and the second roller 17 cooperate in the same manner as the first blade 30a and the first roller 16, when the second roller 14 moves eccentrically in the second cylinder chamber 23, The volumes of the suction region and the compression region of the second cylinder chamber 23 change, and the vapor-phase refrigerant sucked from the suction pipe 25b into the second cylinder chamber 23 is compressed.
  • the high-temperature, high-pressure vapor-phase refrigerant compressed in the first cylinder chamber 21 and the second cylinder chamber 23 is discharged into the closed container 10 via a discharge valve mechanism (not shown).
  • the discharged vapor-phase refrigerant rises inside the closed container 10.
  • the electric motor unit 12 is housed in an intermediate portion along the axial direction of the closed container 10 so as to be located between the compression mechanism unit 11 and the discharge pipe 10b.
  • the electric motor unit 12 is a so-called inner rotor type motor, and includes a rotor 33 and a stator 34.
  • a centrifugal oil separator 35 that separates the refrigerating machine oil I contained in the gas phase refrigerant inside the closed container 10 is incorporated in the upper end of the rotor 33 of the electric motor unit 12.
  • first members for example, the first and second blades 30a and 30b
  • the second members for example, the first and second blades 30a and 30b
  • the materials and physical properties of the first and second rollers 16, 17), the shaft (rotating shaft 15), and the closing member will be described in detail.
  • the first member (for example, the first and second blades 30a and 30b) has a structure in which a diamond-like carbon film (DLC film) is coated on the surface of an iron-based metal base material.
  • DLC film diamond-like carbon film
  • the iron-based metal is a metal containing carbon as a main component and further containing a metal other than iron such as Cr, Ni, Mn, and Si.
  • Preferred iron-based metals are high-speed tool steels (SKH steels), and specific examples thereof include tungsten-based SKH2 to SKH4 and molybdenum-based SKH50 to SKH59. Further, SKD11 (alloy steel material, die steel) can also be used as the iron-based metal.
  • DLC diamond-like carbon
  • Examples of diamond-like carbon (DLC) include hydrogen-free DLC, hydrogen-containing DLC, and Si-containing DLC.
  • the DLC film may be formed on the sliding surface of the base material with at least the second member.
  • the DLC film preferably has a thickness of 1 ⁇ m or more and 3 ⁇ m or less.
  • the DLC film preferably has a base layer interposed between the DLC film and the base material in order to improve the adhesion to the base material.
  • the base layer contains a first layer composed of a single layer of chromium from the surface side of the substrate, a second layer composed of a chromium-tungsten carbide alloy layer, and a metal containing at least one of tungsten and tungsten carbide. It is preferably composed of a third layer made of an amorphous carbon layer.
  • chromium and tungsten carbide have a concentration gradient, the chromium content is higher on the first layer side than on the third layer side, and the tungsten carbide content is first.
  • the height is higher on the third layer side than on the layer side. It is preferable that the third layer has a concentration gradient of tungsten or tungsten carbide, and the content of tungsten or tungsten carbide is higher on the second layer side than on the DLC film side.
  • the second member (for example, the first and second rollers 16 and 17) is formed of cast iron to which magnesium is added, and the amount of carbide deposited on the sliding surface with the first member is 5% or less in terms of area ratio. is there.
  • the second member has a rockwell hardness (HRC) of 40 or more and 55 or less.
  • the addition of magnesium serves to spheroidize the carbon in the cast iron, and the amount of magnesium added is preferably 0.02% by weight or more and 0.1% by weight or less.
  • Magnesium-added cast iron contains at least 0.02% by weight or more and 0.1% by weight or less of magnesium, 2.0% by weight or more and 5.0% by weight or less of carbon, and 0.05% by weight or less of phosphorus, and the balance is It is preferably iron.
  • the amount of carbides deposited (area ratio) on the sliding surface with the first member is taken from a photograph of the sliding surface with the first member taken at 100 times or more and 200 times or less (0. It means a value obtained by defining a measurement field of view of an area of 9 to 1.5 mm) ⁇ (1.2 to 2.0 mm) and determining the amount of carbides deposited in the field of view as an area ratio.
  • the precipitated carbide is, for example, cementite.
  • the amount of carbide deposited on the sliding surface with the first member is preferably 2% or less in terms of area ratio.
  • the lockwell hardness (HRC) of the second member can be determined by the test specified by JIS G2245. By setting the lockwell hardness (HRC) of the second member to 40 or more and 55 or less, familiar wear is likely to occur in the sliding of the first member with the DLC film. As a result, local abnormal wear of the second member can be prevented, and high long-term reliability can be realized.
  • HRC rockwell hardness
  • the rockwell hardness (HRC) exceeds 55 familiar wear is less likely to occur in sliding of the first member with the DLC film, so that the surface pressure is locally increased and abnormal wear occurs.
  • the more preferable rockwell hardness (HRC) of the second member is 45 or more and 50 or less.
  • the second member can obtain a Rockwell hardness (HRC) of 40 or more and 55 or less by performing the following heat treatment, for example. That is, after heating and holding at 880 ° C. for 1 hour, quenching is performed to obtain a martensite structure. Then, it is reheated at a temperature of 250 ° C. or higher and 500 ° C. or lower, held for 2 hours, and tempered to obtain a tempered structure of martensite.
  • the tempering temperature is preferably 400 ° C. or higher and 500 ° C. or lower, and more preferably 430 ° C. or higher and 470 ° C. or lower.
  • sub-zero treatment also called deep cooling treatment
  • the deep cooling treatment is a treatment of cooling at a temperature of 0 ° C. or lower after quenching.
  • the shaft is preferably made of spheroidal graphite cast iron in which graphite crystallizes spherically and has excellent lubricity and high rigidity (high Young's modulus).
  • the intermediate partition plate 18, the first bearing 20, and the second bearing 22, which are closing members, are preferably made of flake graphite cast iron in which graphite is crystallized in a fine flake form as compared with spheroidal graphite cast iron. ..
  • any member of the first member for example, a blade
  • the shaft for example, a shaft
  • the closing member that slides with each other with the second member for example, a roller
  • a solid lubricant such as molybdenum may be applied.
  • refrigerating machine oil I that lubricates the compression mechanism portion 11
  • refrigerating machine oil examples include polyol ester oil, polyvinyl ether oil, polyalkylene glycol oil, and mineral oil. It is desirable that such refrigerating machine oil does not contain an extreme pressure additive, and even if it contains an extreme pressure additive, it is desirable that the content is 0.5% by weight or less.
  • the extreme pressure additive for example, tricresyl phosphate can be used.
  • the refrigerating machine oil contains an extreme pressure additive, the smaller the amount, the better, preferably 0.3% by weight or less, and more preferably 0.1% by weight or less.
  • the refrigerant used in the closed compressor is preferably a chlorine-free refrigerant, and examples thereof include R448A, R449A, R449B, R407G, R407H, R449C, R456A, R516A, R460B, R463A, and R744, HC-based refrigerants.
  • the closed compressor includes a compression mechanism portion that compresses the refrigerant in the closed container, and the compression mechanism portion includes a first member that slides on each other, for example, a blade and a second member.
  • the compression mechanism portion includes a first member that slides on each other, for example, a blade and a second member.
  • a blade has a structure in which the surface of a base material made of an iron-based metal is coated with a diamond-like carbon film (DLC film).
  • the rollers that slide with the DLC film of the blade are formed of cast iron to which magnesium is added, and the amount of carbides deposited on the sliding surface of the blade with the DLC film is specified to be 5% or less in terms of area ratio.
  • the coating film on the surface of the base material of the blade is specified as a DLC film
  • the roller is formed from cast iron to which magnesium is added.
  • the extreme pressure additive of the refrigerating machine oil that lubricates the compression mechanism portion has a function of preventing wear, in the second member (roller) that slides with the DLC film of the first member (blade). Familiar wear of the second member is hindered.
  • the refrigerating machine oil does not contain an extreme pressure additive, or by reducing the extreme pressure additive to 0.5% by weight or less, the familiar wear of the roller is exhibited, and the DLC film of the blade and the roller Abnormal wear on the sliding surface with and can be prevented.
  • Chlorine contained in the refrigerant acts as an extreme pressure additive, that is, has a function of preventing wear. Therefore, in the second member (roller) that slides with the DLC film of the first member (blade), the second member (roller) Familiar wear of the member of 2 is hindered.
  • a chlorine-free refrigerant familiar wear of the rollers is exhibited, and abnormal wear on the sliding surface between the DLC film of the blade and the rollers can be prevented.
  • a compressor having excellent long-term reliability is provided by applying a first member to a blade and a second member to a roller. it can.
  • a shaft that slides with the roller and a closing member for the cylinder chamber are further provided, the roller is formed of magnesium-added cast iron, and the amount of carbides deposited (area) on the sliding surface of the blade with the DLC film.
  • the roller By defining the rate) and HRC in a specific range, the roller causes appropriate familiar wear in sliding with the DLC film, and the surface pressure is reduced.
  • the shaft that slides on the inner peripheral surface of the roller with spheroidal graphite cast iron having a high Young's modulus, the rigidity of the shaft (suppression of runout) is increased and the inclination of the roller that engages with the shaft is suppressed. , It is possible to suppress one-sided contact with the DLC film of the blade.
  • a first member for example, a blade, is composed of a base material made of SKH51 having a Rockwell hardness (HRC) of 63 and a diamond laccarbon film (DLC film) having a thickness of 2 ⁇ m in which the surface of the base material is coated by a CVD method. Made.
  • HRC Rockwell hardness
  • DLC film diamond laccarbon film
  • a second member eg, a roller
  • HRC Rockwell hardness
  • the amount of carbide deposited on the sliding surface with the blade was changed from 0 to 11% in terms of area ratio by adjusting the blending amount of P (phosphorus), which is a component of spheroidal graphite cast iron.
  • the obtained blades and rollers were incorporated into the compression mechanism of a rotary compressor. Further, R410A was used as the refrigerant and polyol ester oil was used as the refrigerating machine oil, and the operation was performed for 500 hours under the condition of a high compression ratio to determine the amount of wear of the DLC film of the blade.
  • Example 2 It was made of cast iron similar to that of Example 1, the amount of carbides deposited on the sliding surface with the blade was 2% in terms of area ratio, and the Rockwell hardness (HRC) was changed to 30 to 65 by adjusting the heating conditions. A roller was made. The roller was incorporated into the compression mechanism of the rotary compressor together with the same blade as in Example 1, and the amount of wear of the DLC film of the blade and the amount of wear of the roller were determined under the same operating conditions. The result is shown in FIG.
  • Example 3 A roller made of cast iron similar to that of Example 1, having a carbide precipitation amount of 2% on the sliding surface with the blade in an area ratio, and a rockwell hardness (HRC) of 45 was produced.
  • HRC hardness
  • Example 3 and Comparative Examples 1 and 2 were incorporated into the refrigerator section of the rotary compressor together with the blades similar to those of Example 1, and coated on the surface of the base material of the blades under the same operating conditions as those of Example 1.
  • the amount of wear of the DLC film was determined. The result is shown in FIG. In FIG. 5, the wear limit value is a value at which the DLC film on the surface of the base material is worn and the surface of the base material is exposed.
  • Example 4 A blade was prepared by coating the surface of a base material made of SKH51 having a Rockwell hardness (HRC) of 63 with a diamond lac carbon film (DLC film) having a Vickers hardness (Hv) of 2500 and a thickness of 2.5 ⁇ m by a CVD method. ..
  • a blade was produced by forming a nitride film having a Vickers hardness (Hv) of 1000 and a thickness of 8 ⁇ m by nitriding the surface of a substrate made of SUS440C having a Rockwell hardness (HRC) of 36.
  • a blade was prepared by coating the surface of a substrate made of SKH51 having a Rockwell hardness (HRC) of 63 with a CrN film having a Vickers hardness (Hv) of 1200 and a thickness of 2 ⁇ m by a CVD method.
  • Example 4 The obtained blades of Examples 4 and Comparative Examples 3 and 4 and the same rollers as in Example 3 were incorporated into the refrigerator section of the rotary compressor in the same manner as in Example 1, and the operating conditions were the same as in Example 1.
  • the wear resistance of the coating film on the blade surface was evaluated in.
  • the blade of Comparative Example 3 in which the base material of SUS440C was nitrided to form a nitride film and the blade of Comparative Example 4 in which the surface of the base material of SKH51 was coated with a CrN film were the same as in Example 4. It was found that the nitride film and the CrN film of the blade wear more than the DLC film of Example 4 in sliding with the roller.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Heat Treatment Of Articles (AREA)
  • Compressor (AREA)
  • Chemical Vapour Deposition (AREA)
PCT/JP2020/007807 2019-03-26 2020-02-26 密閉型圧縮機および冷凍サイクル装置 Ceased WO2020195490A1 (ja)

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JP2021508842A JP7171892B2 (ja) 2019-03-26 2020-02-26 密閉型圧縮機および冷凍サイクル装置
EP20776408.5A EP3951176B1 (en) 2019-03-26 2020-02-26 Sealed compressor and refrigeration cycle device
CN202080023834.8A CN113646533B (zh) 2019-03-26 2020-02-26 密闭型压缩机及制冷循环装置
JP2022173490A JP7532472B2 (ja) 2019-03-26 2022-10-28 密閉型圧縮機および冷凍サイクル装置

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JPS5113902B2 (https=) 1972-09-07 1976-05-04
JPH07259772A (ja) * 1994-03-18 1995-10-09 Nippon Piston Ring Co Ltd 圧縮機用部材
JPH11101189A (ja) * 1997-09-26 1999-04-13 Nippon Piston Ring Co Ltd 回転式圧縮機
JP2007245234A (ja) * 2006-01-26 2007-09-27 Daikin Ind Ltd 圧縮機の摺動部品の製造方法および圧縮機
JP2010101232A (ja) * 2008-10-23 2010-05-06 Panasonic Corp 冷媒圧縮機
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JP2017031830A (ja) * 2015-07-29 2017-02-09 株式会社富士通ゼネラル ロータリ圧縮機

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JPWO2020195490A1 (ja) 2021-12-02
CN113646533A (zh) 2021-11-12
JP7171892B2 (ja) 2022-11-15
EP3951176A4 (en) 2022-12-28
JP7532472B2 (ja) 2024-08-13
CN113646533B (zh) 2023-10-10
EP3951176A1 (en) 2022-02-09
JP2023017855A (ja) 2023-02-07

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