JP2006161702A - Refrigerant compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem that finish grinding or lapping process after nitriding treatment is required since dimension accuracy can not be kept due to expansion of nitriding treatment after final finishing work in a vane treated by conventional nitriding treatment, and that there is possibility of exfoliation of coating film during operation in a vane having ion plating applied on a vane tip. <P>SOLUTION: Shotpeening process is applied before ion plating treatment and ion plating treatment is applied on the vane tip after that. Consequently, since nitrided layer does not exist, the problems of expansion due to nitriding treatment and exfoliation of nitrided layer and ion plating treatment layer don't occur. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a refrigerant compressor used for commercial and household refrigeration air conditioning.

  In the conventional refrigerant compressor, for example, as shown in FIG. 3, the surface hardness of the vane base material 31 is increased by a nitriding treatment 32 before the ion plating treatment.

  The compressor includes a roller that rotates eccentrically in the cylinder, and a vane that is slidably inserted in the cylinder groove. However, under severe operating conditions of the HFC refrigerant, in order to minimize the sliding wear between the vane tip and the roller outer peripheral surface, the vane tip is not in a state where the nitrided layer is exposed at least, but a harder ion plating ( A treated film (CrN, carbon hard film) is required (for example, see Patent Document 1).

However, since the reliability of the sliding wear between the vane and the cylinder has been maintained in the conventional nitrided layer, the shot peening method is adopted as a method to replace the nitriding to increase the hardness of the vane side surface to the required level. (For example, see Patent Document 2).
Japanese Patent Laid-Open No. 06-093990 Japanese Patent Laid-Open No. 08-003633

  In this case, although the vane side surface is a nitrided layer and wear resistance can be maintained, there has been a problem that dimensional accuracy cannot be maintained due to expansion due to nitriding after final finishing. For this reason, after the nitriding treatment, further polishing or lapping must be performed.

  In the case where ion plating is performed on the tip of the vane, if an ion plating film is first formed on the tip of the vane, the coating film may be peeled off during operation and use, and therefore, countermeasures are necessary.

  The present invention eliminates the above-mentioned problems caused by nitriding by performing shot peening before the ion plating in the tip ion plating vane and then performing ion plating on the tip of the vane. It becomes possible.

  In the vane of the present invention, the conventional required nitriding hardness is ensured by shot peening, and finish polishing or lapping after nitriding is not required, and an ion plating film is formed at the vane tip as usual.

  By the shot peening process applied to the vane tip, fine irregularities are formed on the vane, and the subsequent adhesion strength with the base of the ion plating film can be improved, and the mechanical member between the cylinder groove and the roller outer peripheral surface can be improved. Reliability can be improved.

  In the present invention, an ion plating treatment film is formed on the vane tip at the roller and vane tip most important for compressor mechanical sliding wear, and the side surface of the vane is Hv850-1100 by shot peening instead of conventional nitriding. By ensuring the hardness, it is possible to improve the mechanical reliability of the roller and the cylinder sliding with the vane.

  In the present invention, the refrigerant is an HFC refrigerant and the refrigerating machine oil is ester oil or ether oil, and the operating conditions are severe sliding wear conditions in which the refrigerant does not contain chlorine. Can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 is a longitudinal sectional view of a mechanism part of a refrigerant compressor according to an embodiment of the present invention, FIG. 2 is a transverse sectional view showing a main part of the compression mechanism, and FIG. 4 is a schematic view showing a metal structure of a vane in the present invention. It is.

  In FIG. 1 and FIG. 2, 1 is a sealed container, and the electric motor part 2 and the compression mechanism part 3 are arranged. The electric motor unit 2 includes a rotor 2a and a stator 2b, and a shaft 8 rotatably supported by a main bearing 9 and a sub bearing 10 is fixed to the rotor 2a by a method such as press fitting. The compressor unit 3 includes a cylinder 20 having a suction hole 5 and a radial cylinder groove 23, a roller 7 that rotates eccentrically while sliding an outer peripheral surface on the inner peripheral surface of the cylinder 20, and an inner peripheral surface of the roller 7. The eccentric portion of the shaft 8 slidably inserted and the cylinder groove 23 are reciprocally slidably accommodated, and the tip portion is pressed against the roller 7 by the pressing force and back pressure (discharge pressure) by the spring 24. A vane 21 that divides the internal space into a suction chamber 25 and a compression chamber 26, and a main bearing 9 and a sub-bearing 10 that seal both ends of the cylinder are configured.

  Next, the operation of the rotary compressor according to this configuration will be described. When the motor unit 2 is energized from the outside, the rotor rotates and the shaft 8 is rotationally driven. When the shaft 8 rotates, the roller 7 slidably attached to the eccentric portion performs a planetary motion (counterclockwise rotation in FIG. 2) while slidingly contacting the cylinder inner peripheral surface. As a result, refrigerant gas such as HFC is sucked into the suction chamber 25 from the suction pipe 4 through the suction hole 5, and at the same time, the refrigerant gas whose pressure is increased in the compression chamber 26 passes through the discharge hole 6 through the discharge hole 6 and is sealed. 1 is discharged.

  In FIG. 1, the position of the discharge hole 6 is depicted at a position away from the suction hole for the sake of clarity, but in reality, it is disposed near the suction hole 5 with the vane 21 interposed therebetween as shown in FIG. 2. .

  At this time, the vane 21 that divides the suction chamber 25 and the compression chamber 26 is pressed against the outer peripheral surface of the roller 7 by the pressure applied to the spring 24 and the back of the vane, and the tip portion is the outer peripheral surface of the roller 7 and the side portion is the cylinder. It will slide with the inner wall surface of the groove 23. Lubrication of the vane 21, the roller 7, and the cylinder groove 23 is performed using the lubricating oil 12 stored in the bottom of the hermetic container in a steady operation state, but there is not enough lubricating oil in the sliding portion at the start. The lubricating oil 12 slightly contained in the sucked refrigerant gas (the lubricating oil is slightly discharged together with the refrigerant gas from the compressor, circulates through the refrigeration cycle, and then returns to the compressor from the suction pipe 4 again. Come) will be used.

  The vane 21 is generally made of a high-speed steel material. However, as described above, the sliding condition at the start of the hermetic rotary compressor is harsh when lubricating oil is not sufficiently supplied. It can be said that the sliding conditions are more severe because the oil film is difficult to be formed during the period. In addition, since the HFC refrigerant adopted for environmental measures in recent years has poor lubricity, it can be said that the sliding condition of the rotary compressor using the HFC refrigerant is particularly severe.

  In the conventional refrigerant compressor, additional finishing polishing or lapping treatment for correcting expansion or deformation due to nitriding treatment is necessary. However, the present invention replaces the ion plating pretreatment with the shot peening treatment 34, and Is intended to eliminate the problem.

  The vane of the present invention can be subjected to shot peening treatment on the vane surface as a substitute for surface modification by nitriding treatment, so that the final finishing of the surface after the treatment can be omitted, and there is no expansion of the vane dimensions compared with the nitriding treatment. For this reason, the vane can be used as it is. After that, by applying ion plating treatment to the vane tip to prevent severe sliding wear with the roller, wear between the vane tip, the roller outer periphery and the cylinder groove is a problem even under severe operating conditions under HFC refrigerant conditions. Since no vanes can be supplied, and cost reduction and reliability can be improved, the above-described problem of wear between compressor mechanical parts can be solved.

A longitudinal sectional view showing a conventional and a rotary compressor according to an embodiment of the present invention Cross-sectional view showing the main part of the refrigerant compressor in the prior art and the embodiment of the present invention Cross-sectional view schematically showing the metal structure of a conventional vane Cross-sectional view schematically showing the vane metal structure of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Electric motor part 3 Compressor part 4 Suction pipe 5 Suction hole 6 Discharge hole 7 Roller 8 Shaft 9 Main bearing 10 Sub bearing 11 Tightening bolt 12 Refrigerating machine oil 20 Cylinder 21 Vane 22 Discharge notch
23 Cylinder groove 24 Spring 25 Suction chamber 26 Compression chamber 31 Base material 32 Nitride layer 33 Ion plating layer 34 Shot peening layer

Claims (7)

A cylinder having a cylindrical cylinder and a vane groove formed in the radial direction while opening to the cylinder, a roller that rotates eccentrically while abutting against a cylindrical wall surface of the cylinder, and retracted and retracted in the vane groove A refrigerant compressor including a vane biased to contact the outer peripheral surface of the roller, wherein the vane cuts a raw material made of steel, performs a roughing process, performs a quenching and tempering process, and further performs a grinding finishing process. Then, a shot peening process is performed, and then a PVD coating film (CrN) is formed on the tip of the vane. A cylinder having a cylindrical cylinder and a vane groove formed in the radial direction while opening to the cylinder, a roller that rotates eccentrically while abutting against a cylindrical wall surface of the cylinder, and retracted and retracted in the vane groove A refrigerant compressor including a vane biased to contact the outer peripheral surface of the roller, wherein the vane cuts a raw material made of steel, performs a roughing process, performs a quenching and tempering process, and further performs a grinding finishing process. Then, a shot peening treatment is performed, and then a hard carbon thin film (DLC) is formed at the tip of the vane. 3. The refrigerant compressor according to claim 1, wherein the raw material of the vane is made of high speed steel SKH51. 3. The refrigerant compressor according to claim 1, wherein the raw material of the vane is martensitic stainless steel SUS440C. The refrigerant compressor according to claim 1 or 2, wherein the raw material of the vane is made of hot alloy tool steel SKD. 3. The refrigerant compressor according to claim 1, wherein the raw material of the vane is made of bearing steel SUJ2. 7. The refrigerant compressor according to claim 1, wherein the refrigerant is HFC and the refrigerating machine oil is ester or ether oil.

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