WO2012020740A1 - 冷媒圧縮機 - Google Patents
冷媒圧縮機 Download PDFInfo
- Publication number
- WO2012020740A1 WO2012020740A1 PCT/JP2011/068092 JP2011068092W WO2012020740A1 WO 2012020740 A1 WO2012020740 A1 WO 2012020740A1 JP 2011068092 W JP2011068092 W JP 2011068092W WO 2012020740 A1 WO2012020740 A1 WO 2012020740A1
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- WO
- WIPO (PCT)
- Prior art keywords
- refrigerant compressor
- coating
- hard
- hard coating
- hardness
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
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- 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
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/0094—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 crankshaft
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
- F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
- F04C18/0215—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form where only one member is moving
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/0042—Driving elements, brakes, couplings, transmissions specially adapted for pumps
- F04C29/005—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions
- F04C29/0071—Couplings between rotors and input or output shafts acting by interengaging or mating parts, i.e. positive coupling of rotor and shaft
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/043—Sliding surface consisting mainly of ceramics, cermets or hard carbon, e.g. diamond like carbon [DLC]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2230/00—Manufacture
- F04C2230/90—Improving properties of machine parts
- F04C2230/91—Coating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/50—Bearings
- F04C2240/54—Hydrostatic or hydrodynamic bearing assemblies specially adapted for rotary positive displacement pumps or compressors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2270/00—Control; Monitoring or safety arrangements
- F04C2270/16—Wear
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- 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
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- 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
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- 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
- F05C2253/00—Other material characteristics; Treatment of material
- F05C2253/12—Coating
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- 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
- F05C2253/00—Other material characteristics; Treatment of material
- F05C2253/20—Resin
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/20—Sliding surface consisting mainly of plastics
Definitions
- the present invention relates to a refrigerant compressor for refrigeration and air conditioning, and more particularly to improvement of a bearing sliding portion of the refrigerant compressor.
- APF energy consumption efficiency
- An object of the present invention is to obtain a highly reliable refrigerant compressor that can suppress the occurrence of galling and seizure in a bearing sliding portion and can also improve wear resistance.
- the present invention comprises a compression mechanism section that compresses a refrigerant and a rotation shaft that drives the compression mechanism section, and an engagement section between the rotation shaft and the compression mechanism section, or the rotation.
- the slide bearing is configured using a lead-free resin impregnated material having a foreign matter burying property for burying the wear particles
- the rotating shaft is made of an iron-based material, and a hard coating having a hardness of 1000 Hv or more is provided on a portion of the rotating shaft that slides with the slide bearing.
- FIG. 1 is a longitudinal sectional view showing a first embodiment of a refrigerant compressor according to the present invention.
- FIG. 2 is an enlarged cross-sectional view of the vicinity of a plain bearing portion in FIG. 1.
- the graph which shows the relationship between the hardness of the hard film coat
- the year-round energy consumption efficiency (APF) in an air conditioner is the efficiency of the air conditioner according to the state of use, and importance is placed on the efficiency in a load region lower than the rated point. For this reason, the refrigerant compressor is often operated at a low speed. However, when the refrigerant compressor is operated at a low speed, as described above, the oil film thickness at the bearing cannot be ensured sufficiently at the low speed operation, and the transition to the boundary lubrication region is likely. As a result, metal contact is induced and problems such as galling, seizure, and wear are easily caused, and the performance and quality of the refrigerant compressor are deteriorated.
- a resin material such as PTFE, which is an impregnation material, is also used as a bearing for a refrigerant compressor.
- a resin material includes wear particles (foreign matter) such as metal particles. ) Is embedded in the resin material, and has an effect of reducing galling and wear due to wear particles.
- wear particles foreign matter
- the metal particles (wear particles) embedded in the resin material and the rotating shaft cause metal contact, which causes galling and seizure. It has been found that there is a problem of developing. Specific examples for solving this problem will be described below with reference to the drawings.
- the fixed scroll 100 is also provided with a suction port 103 and a discharge port 104.
- the rotating shaft 300 is supported by a slide bearing (main bearing) 401 provided on the frame 400 at the upper part of the electric motor and a sub bearing 801 provided on the lower frame 800 at the lower part of the electric motor.
- the frame 400 and the lower frame 800 are fixed to a sealed container 700.
- a crankpin (eccentric shaft) 301 made of an iron-based material is provided at the tip of the rotary shaft 300, and the crankpin 301 is inserted into a boss portion 203 protruding below the base plate 201 of the orbiting scroll 200. Has been engaged.
- a slewing plain bearing 210 is provided in the boss portion 203 and is configured to slide with the crank pin 301.
- an Oldham joint 500 is disposed on the back surface of the base plate 201 of the orbiting scroll 200, and the orbiting scroll 200 is orbited by the Oldham joint 500 without rotating with respect to the fixed scroll 100.
- the rotation causes the crank pin 301 provided at the tip of the rotary shaft 300 to rotate eccentrically, and the orbiting scroll 200 is provided with a rotation prevention mechanism for the Oldham coupling 500.
- a turning motion is performed without rotating about the fixed scroll 100.
- the gas is sucked into the sealed chamber formed by the spiral wraps 102 and 202 through the suction pipe 711 and the suction port 103, and the sealed chamber moves toward the central portion side with the swirling motion.
- the volume is reduced while the gas is compressed, and the compressed gas is discharged from the discharge port 104 to the discharge chamber 710.
- the gas discharged into the discharge chamber 710 circulates around the compression mechanism section and the electric motor section, and is then discharged from the discharge pipe 701 to the outside of the compressor.
- a bearing housing 802 that accommodates the auxiliary bearing 801 is attached to the lower frame 800, and a pump unit 900 is provided at the lower end of the bearing housing 802.
- the pump unit 900 is driven via a pump joint 310 attached to the lower end of the rotating shaft 300.
- the oil in the oil reservoir 730 is sucked up by the pump unit 900 and reaches the upper portion of the crank pin 301 from the pump unit 900 via an oil passage 311 formed in the rotating shaft.
- the oil lubricates the swivel slide bearing 210 and then flows to the slide bearing 401.
- the oil lubricated the slide bearing 401 passes through the oil drain pipe 408 and returns to the oil reservoir 730.
- FIG. 2 is an enlarged cross-sectional view of the vicinity of the slewing slide bearing 210 and the slide bearing (main bearing) 401 shown in FIG. 1, and the portions denoted by the same reference numerals as those in FIG. 1 are the same portions.
- a lead-impregnated resin-impregnated material is used for the sliding bearings such as the swivel sliding bearing 210 and the sliding bearing 401, and the surface (outer peripheral surface) of the rotating shaft 300 that slides on the sliding bearing (main bearing) 401.
- a hard coating 1000 having a hardness of 1000 Hv or more (preferably 1500 Hv or more) is provided on the surface (outer peripheral surface) of the crank pin 301 that slides with the orbiting slide bearing 210.
- a resin material having a foreign substance burying property such as PTFE (polytetrafluoroethylene) is used.
- POM polyacetal
- PBT polybutylene terephthalate
- PPS polyphenylene sulfide
- PEEK polyetheretherketone
- the surface (outer peripheral surface) of the rotary shaft 300 and the crank pin 301 that slides with the slide bearing 401 or the swing slide bearing 210 has a hardness of 1000 Hv or more (preferably 1500 Hv or more). Since the hard coating 1000 is provided, it is possible to significantly reduce the wear of the rotating shaft and the crankpin due to the wear particles and the occurrence of galling and linear scratches. That is, since the hardness of the wear particles embedded in the lead-free resin-impregnated bearing in the refrigerant compressor is almost less than 1000 Hv, the rotating shaft 300 (including the crank pin) is worn by the wear particles, or is galling or linear. It has been found that the occurrence of scratches can be greatly reduced, and in particular, by using a hard coating of 1500 Hv or higher, the shaft galling, seizure, and wear hardly proceed.
- FIG. 3 is a graph showing the relationship between the hardness of the hard coating coated on the rotating shaft and the amount of bearing wear of the lead-free resin-impregnated bearing. This graph confirms a refrigerant compressor (scroll compressor) by performing a severe sliding test in a boundary lubrication region where it is difficult to form an oil film at low speed.
- the horizontal axis indicates the type of hard coating on the surface of the rotating shaft ( Hardness of hard coating), non-coating (A) uses S45C as an iron-based material, the sliding part is hardened to a hardness of about 600 Hv by hardening, DLC (B) is iron-based
- the rotating shaft surface is a rotating shaft with a DLC coating (hard carbon coating) having a hardness of 3000 Hv, and DLC (C) is a rotating shaft with a DLC coating having a hardness of 4000 Hv on the rotating shaft surface of a ferrous material. .
- the vertical axis is based on the amount of wear of a lead-free resin-impregnated bearing with a foreign substance burying property that slides when a non-coated (A) rotating shaft is used, and has another hard coating.
- the bearing wear amount (specific wear amount) of the lead-free resin-impregnated bearing having a foreign substance burying property that slides with the rotating shafts DLC (B) and DLC (C) is shown.
- the bearing wear amount of the lead-free resin-impregnated bearing that slides on the non-coated (A) rotating shaft is determined as follows. It is lower than when used. Further, the damaged state of the rotating shaft and the bearing after sliding was good, and neither the rotating shaft nor the bearing was found to have a linear scratch.
- the rotating shaft with a hard coating having a hardness of 1000 Hv or more is used in order to keep the rotating shaft in a good state without causing galling or seizure even when it comes into contact with wear particles such as metal particles. It is preferable to use it. Therefore, in the present embodiment, by applying a hard coating with a hardness in the range of 1000 Hv to 3000 Hv (preferably 1500 to 3000 Hv), bearing sliding such as the slewing slide bearing 210, the slide bearing 401, the rotating shaft 300 and the crank pin 301 is performed. The occurrence of galling and seizure in the section can be suppressed, and wear can be reduced, so that a highly reliable refrigerant compressor that can improve wear resistance can be obtained.
- a hard film having a hardness of 1000 Hv or more (preferably 1500 Hv or more) formed by vapor deposition or the like on the outer peripheral surface of the cylindrical member 302 made of an iron-based material is manufactured in advance, and the cylindrical member 302 is turned into a swivel slide bearing 210.
- the sliding shaft 401 and the rotating shaft 300 and the crank pin 301 are configured to be fitted to the sliding bearing 401.
- the productivity is about 5 to about 5 to that of the example shown in FIG. It becomes possible to improve 10 times, and as a result, the cost of the refrigerant compressor can be reduced.
- FIG. 5 is a diagram showing a configuration of the base material (rotating shaft 300 and cylindrical member 302) and the hard coating 1000 shown in FIG. 2 and FIG.
- the base material for forming a hard coating on the surface is a rotating shaft (including a crankpin) 300 shown in FIG. 2, or a cylindrical member 302 fitted to the rotating shaft as shown in FIG. is there.
- a hard coating 1000 having a hardness of, for example, 1500 Hv is formed on the surface of the substrate.
- the hard coating 1000 includes a chromium-based (Cr-based) coating (for example, CrN), a titanium-based (Ti-based) coating (for example, TiN), a hard carbon-based coating (DLC), and a Si-containing hard carbon-based coating (Si: DLC).
- Cr-based chromium-based
- Ti-based titanium-based
- DLC hard carbon-based coating
- Si Si-containing hard carbon-based coating
- DLC Diamond-Like Carbon
- SP 3 bonds that make up diamond
- SP 2 bonds that have a graphite structure
- each of the hard coatings described above can improve the smoothness of the surface, physical wear and friction are hardly caused, and a hard coating having a hardness of 1500 Hv or more can be easily obtained. Therefore, by providing any of the hard coatings described above on the surface of the rotating shaft that slides with the slide bearing, a refrigerant compressor that can suppress the occurrence of galling and seizure at the sliding portion of the bearing and can also improve wear resistance. Obtainable.
- FIG. 6 is an enlarged cross-sectional view for explaining another example in which a hard coating is provided on a base material, and the portions denoted by the same reference numerals as those in FIG.
- a hard coating is provided on a base material, and the portions denoted by the same reference numerals as those in FIG.
- the hardness of the iron-based material (base material) constituting the rotary shaft 300 is low
- a hard coating with high hardness for example, a DLC coating with high hardness
- the hard coating 1000 may be peeled off due to deformation of the sliding portion or the like.
- the example shown in FIG. 6 explains a method for forming a hard coating on a substrate that is effective in preventing the hard coating 1000 from peeling off.
- an intermediate layer 1001 having intermediate hardness between the base material and the hard film is provided between the hard film 1000 and the base material (the rotary shaft 300 or the cylindrical member 302). That is, the rotating shaft 300 and the cylindrical member 302 made of an iron-based material are used as a base material, and an intermediate layer 1001 made of a Cr-based film having a hardness of about 1000 to 1500 Hv is first formed on the base material.
- a hard coating 1000 made of a DLC coating having a hardness of about 2000 to 3000 Hv is formed thereon.
- the intermediate layer 1001 has good adhesion to the iron-based substrate.
- the Cr-based coating is provided, a highly reliable refrigerant compressor that can prevent the peeling of the hard coating can be obtained.
- the intermediate layer 1001 and the hard coating 1000 can be formed using a vapor deposition method or the like.
- FIG. 7 is an enlarged cross-sectional view for explaining still another example in which a hard coating is provided on a base material, and the portions denoted by the same reference numerals as those in FIG. 5 indicate the same or corresponding portions.
- the example shown in FIG. 7 is the same as the example shown in FIG. 5 in that the rotating shaft 300 and the cylindrical member 302 made of an iron-based material are used as the base material, and the hard coating 1000 is formed on the base material.
- the hard coating 1000 is characterized in that it is an inclined film whose hardness gradually increases from the base material side to the sliding surface side.
- a Si-containing carbon-based coating (Si: DLC) is used as the hard coating 1000, and the gradient film gradually reduces the Si amount (Si concentration) of the coating from the substrate surface side to the sliding surface side.
- the hardness of the hard coating 1000 on the substrate side is about 1000 Hv, and the hardness on the sliding surface side is 1500 Hv or more.
- a hard film made of such a gradient film can also be formed on the surface of the substrate by vapor deposition or the like.
- the base material (the rotating shaft 300 or the cylindrical member 302) is placed in a vacuum chamber having a vacuum degree of 10 ⁇ 3 to 10 ⁇ 5 Pa, and a negative bias is applied thereto.
- the ionized raw material for producing the hard coating is electrically accelerated and collides with the substrate to form the hard coating on the substrate surface.
- a hydrocarbon-based gas such as C 6 H 6 or C 2 H 2 is introduced for the formation of DLC, and silane such as tetramethylsilane is used as a raw material for Si as an additive.
- System gas is introduced.
- the Si amount of the hard coating 1000 near the substrate is approximately 20 at.% From the viewpoint of adhesion to the substrate.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
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- Applications Or Details Of Rotary Compressors (AREA)
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Abstract
Description
このPTFEを主成分とし鉛を含まない摺動材料の従来技術としては、特許文献1に記載されたものなどが挙げられる。
しかし、冷媒圧縮機を低速で運転すると、前述した通り、低速運転では軸受での油膜厚さを十分確保できず、境界潤滑領域に移行し易い。その結果、金属接触を誘発し、かじりや焼付き、或いは摩耗といった問題を引き起こし易く、冷媒圧縮機の性能、品質が低下する。
この課題解決のための具体的実施例を、以下図面に基づき説明する。
密閉容器700内には、上方に圧縮機構部、中央に電動機600、下方に油溜り730が配設されており、鉄系材料で構成された回転軸300を介して前記圧縮機構部と電動機600が接続されている。前記圧縮機構部は、台板101に渦巻き状のラップ102を直立した固定スクロール100と、台板201に渦巻き状のラップ202を直立した旋回スクロール200とを、ラップを互いに噛み合わせて形成されている。前記固定スクロール100には吸入口103及び吐出口104も設けられている。前記回転軸300は、電動機上部のフレーム400に設けられたすべり軸受(主軸受)401と、電動機下部の下フレーム800に設けられた副軸受801により支持されている。前記フレーム400及び前記下フレーム800は密閉容器700に固定されている。前記回転軸300の先端には鉄系材料で構成されたクランクピン(偏心軸)301が設けられ、該クランクピン301は前記旋回スクロール200の台板201の下方に突設したボス部203に挿入されて係合されている。ボス部203内には旋回すべり軸受210が設けられており、前記クランクピン301と摺動するように構成されている。また、前記旋回スクロール200の台板201の背面にはオルダム継手500が配設され、該オルダム継手500により、旋回スクロール200は、固定スクロール100に対して自転することなく旋回運動される。
図5において、表面に硬質被膜を形成する基材となるものは、図2に示す回転軸(クランクピンを含む)300、或いは図4に示すように回転軸に嵌合される円筒部材302である。この基材の表面には、硬度が例えば1500Hvの硬質被膜1000が形成されている。この硬質被膜1000としては、クロム系(Cr系)被膜(例えばCrN)、チタン系(Ti系)被膜(例えばTiN)、硬質炭素系被膜(DLC)、Si含有硬質炭素系被膜(Si:DLC)などを使用でき、これらの硬質被膜1000は、蒸着法などにより基材に被膜することで、基材表面に硬質被膜を形成することができる。また、前述した硬質被膜は、何れも耐腐食性が高く、高硬度で低摩擦係数を示すものであり、すべり軸受と摺動する摺動材として好適なものである。特に、硬質炭素系被膜であるDLC(Diamond-like Carbon)は、ダイヤモンドを構成するSP3結合と、グラファイト構造を有するSP2結合が混合しており、その硬度はコーティング条件の調整により結合比を種々変えることで調整することでができる。
200 旋回スクロール(201:台板、202:ラップ、203:ボス部、210:旋回すべり軸受、220:給油路)
300 回転軸(301:クランクピン、302:円筒部材、310:ポンプ継ぎ手、311:油通路)
400 フレーム(401:すべり軸受、402:シール部、408:排油パイプ)
500 オルダム継手
600 電動機
700 密閉容器(701:吐出管、710:吐出室、711:吸入管、730:油溜り)
800 下フレーム(801:副軸受、802:軸受ハウジング)
900 ポンプ部
1000 硬質被膜
1001 中間層。
Claims (7)
- 冷媒を圧縮する圧縮機構部と、該圧縮機構部を駆動する回転軸とを備え、前記回転軸と前記圧縮機構部との係合部、或いは前記回転軸を支持する回転支持部の少なくとも何れかにすべり軸受を備えている冷媒圧縮機において、
前記すべり軸受は摩耗粒子を埋収させる異物埋収性を有する無鉛樹脂含浸材を用いて構成され、
前記回転軸は鉄系材料で構成されると共に、この回転軸の前記すべり軸受と摺動する部分には硬さが1000Hv以上の硬質被膜が設けられていることを特徴とする冷媒圧縮機。 - 請求項1に記載の冷媒圧縮機において、前記硬質被膜の硬度は1500~3000Hvであることを特徴とする冷媒圧縮機。
- 請求項1に記載の冷媒圧縮機において、前記回転軸に設けた前記硬質被膜は、鉄系材料で構成された円筒部材の外周面に硬質被膜を形成し、この硬質被膜を形成した円筒部材を前記回転軸に嵌合することで設けられていることを特徴とする冷媒圧縮機。
- 請求項1に記載の冷媒圧縮機において、前記硬質被膜は、クロム系被膜、チタン系被膜、硬質炭素系被膜、Si含有硬質炭素系被膜の少なくとも何れかであることを特徴とする冷媒圧縮機。
- 請求項4に記載の冷媒圧縮機において、前記硬質被膜は、前記回転軸を構成する鉄系材料の基材表面にクロム系被膜を形成し、このクロム系被膜の上に、該クロム系被膜より硬度の高い硬質炭素系被膜を形成して構成されていることを特徴とする冷媒圧縮機。
- 請求項4に記載の冷媒圧縮機において、前記硬質皮膜はSi含有硬質炭素系被膜であって、このSi含有硬質炭素系被膜は、前記回転軸を構成する鉄系材料の基材表面から摺動面にかけて、そのSi濃度が減少する傾斜膜に形成されていることを特徴とする冷媒圧縮機。
- 請求項1に記載の冷媒圧縮機において、前記圧縮機構部は、台板に渦巻状のラップを有する固定スクロールと旋回スクロールを互いに組み合わせて構成されたスクロール圧縮機であることを特徴とする冷媒圧縮機。
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US13/815,000 US20130195707A1 (en) | 2010-08-11 | 2011-08-08 | Refrigerant Compressor |
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JP2012036878A (ja) | 2012-02-23 |
CN103069166B (zh) | 2016-01-27 |
JP5385873B2 (ja) | 2014-01-08 |
US20130195707A1 (en) | 2013-08-01 |
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