JP2001271774A - Rotary compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary compressor with high reliability and equipped with a vane having high wear resistance, having a refrigerating circuit formed by connecting a compressor, a condenser, an expansion device, and an evaporator with a pipe, even if a coolant containing no chlorine in molecules is used and polyol ester or polyvinyl ether is used as base oil of a lubricating oil. SOLUTION: The vane using steel as a base material is nitrided to form an iron nitride layer having Fe and F as the component on the surface, then heat-treated in a treating agent having at least one of a chloride of alkali metal and a chloride of alkali earth metal as the main component and containing chromium to disperse chromium in the iron nitride layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary compressor using a refrigerant containing no chlorine in a molecule and a polyol ester or polyvinyl ether as a base oil as a lubricating oil. The present invention is to provide a rotary compressor which prevents the rotation of the compressor.

[0002]

2. Description of the Related Art Compressors for refrigerators, vending machines and showcases, and compressors used in home and commercial air conditioners conventionally use a large amount of dichlorodifluoromethane (R12) or monochlorodifluoromethane (R22) as a refrigerant. I was Due to the potential of ozone depletion, R12 and R22 are subject to chlorofluorocarbon regulation because they are released into the atmosphere and reach the ozone layer above the earth, destroying the ozone layer. This destruction of the ozone layer is caused by chlorine groups (Cl) in the refrigerant. Therefore, the refrigerant containing no chlorine group, for example, R32, R125 or R134a
HFC-based refrigerants are considered as alternative refrigerants.

FIG. 1 shows a cross-sectional structure of a two-cylinder rotary compressor to which the present invention is applied, FIG. 2 is a cross-sectional explanatory view showing the relationship among cylinders, rollers, vanes, etc., and FIG. FIG. 1 is an explanatory view of a rotary compressor, which is generally designated by reference numeral 1 and includes a cylindrical hermetic container 10 and a hermetic container 10.
An electric motor 20 and a compression device 30 housed therein are provided.
The electric motor 20 has a stator 22 and a rotor 24 fixed to the inner wall of the closed casing 10, and a rotary shaft 25 attached to the center of the rotor 24 has two plates closing the openings of the cylinders 31 and 32. It is rotatably supported by 33 and 34. An eccentric crank portion 26 is formed on a part of the rotating shaft 25. The cylinders 31 and 32 are disposed inside the two plates 33 and 34. The cylinders 31 and 32 (hereinafter, the cylinder 32 will be described)
Has the same axis as the axis of the rotating shaft 25. In the peripheral wall of the cylinder 32, a refrigerant inlet 23 and a refrigerant outlet 35 are provided.
Is provided.

A ring-shaped roller 38 is provided in the cylinder 32.
The inner surface 38 b of the roller 38 contacts the outer surface 26 a of the crank 26, and the outer surface 38 a of the roller 38 contacts the inner surface 32 b of the cylinder 32.
A vane 40 is slidably provided on the cylinder 32,
The tip 40 a of the vane 40 contacts the outer peripheral surface 38 a of the roller 38. The vane 40 is urged toward the roller 38 and the compressed refrigerant is introduced into the back of the vane 40 to ensure the seal between the vane tip and the roller 38. The vane 40, the roller 38, and the cylinder 32
Thus, a compression chamber 50 is formed surrounded by the plate 34 and the like closing the cylinder 32.

When the rotation shaft 25 rotates counterclockwise in FIG. 2, the roller 38 also rotates eccentrically in the cylinder 32, and the refrigerant gas sucked from the suction port 23 is compressed.
It is discharged from the discharge port 35. In the suction-compression-discharge process, a pressing force Fv is generated at a contact portion between the roller 38 and the vane 40.

Conventionally, a material obtained by quenching cast iron or alloy cast iron is used as a base material of the roller 38, and stainless steel or tool steel or a nitriding treatment thereof is used as a base material of the vane 40 [for example, chromium Methods for forming a nitride layer on the surface of a steel product include a plating diffusion method, a chromizing treatment method (Japanese Patent Publication No. 42-24967, US Pat. No. 4,242,151) and a salt bath method (Japanese Patent Publication No.
JP-A-65435, JP-B-4-24422, JP-B-4-24423, JP-B4-47028, JP-B4-47029, and JP-A-2-1593.
61, JP-A-3-202460) and various other methods have been proposed. The surface treatment described above is mainly used, and in particular, the vane material is generally provided with high hardness and toughness. Hard chromium plating or physical vapor deposition (PVD)
Method) and other hard film coatings.

[0007]

The lubricating oil used for the HFC refrigerant includes ester oils, ether oils, and mixed oils thereof which are compatible with the HFC refrigerant. However, when the refrigerant is replaced with an HFC-based refrigerant and the lubricating oil is shifted to an ester-based oil or an ether-based oil, the conventional surface treatment, for example, in the case of ion nitriding, has a high friction coefficient. When present, the ester oil or ether oil is hydrolyzed to generate acid when the temperature becomes high due to friction, and sludge such as metal soap is formed by the generated acid, and this sludge is deposited on the sliding portion on the surface of the vane. Problems such as dripping, corrosion, and wear.
In the case of N-coating treatment, there was a problem that the coating peeled off during operation, and there was a problem that it was difficult to cope with production due to a variation in coating film thickness. Therefore, the rotary compressor equipped with these vanes can be operated stably for a long period of time. Did not.

An object of the present invention is to solve the conventional problems,
A rotary compressor that uses a polyol ester or polyvinyl ether as a base oil as a refrigerant and a lubricant that does not contain chlorine in the molecule, has no problem of peeling of the cured film, and has high abrasion resistance similar to conventional CrN coating. The object of the present invention is to provide a highly reliable rotary compressor equipped with a vane having the same.

[0009]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the problems. As a result, instead of coating, vanes made of steel as a base material are subjected to nitriding treatment, and an iron nitride layer (most (Including an iron nitride compound layer formed on the surface and an iron nitride diffusion layer formed thereunder), and replacing the Fe component of the iron nitride layer with Cr to change to a compound composed of CrN. Nitriding treatment is performed to form only an iron nitride diffusion layer, and the Fe component of this diffusion layer is replaced with Cr to change to a compound made of CrN. To form a compound consisting of CrN by replacing the Fe component of the compound layer with Cr, or by subjecting the vane to nitrosulphurizing treatment to form an iron sulfide layer (compound layer) on the outermost surface Rutotomoni to produce a diffusion layer whose components Fe and N under the iron sulfide layer, Fe of the iron nitride layer
By replacing the component with Cr and replacing it with a compound consisting of CrN, the problem of peeling off of the cured film as in the case of coating is eliminated, and the reliability with a vane having high abrasion resistance is the same as with conventional CrN coating. The present inventors have found that a high rotary compressor can be provided, and have accomplished the present invention.

That is, the invention of claim 1 of the present invention for solving the problems comprises a refrigerating circuit in which a compressor, a condenser, an expansion device, an evaporator and the like are sequentially connected by piping, and chlorine is contained in a molecule. Having a kinematic viscosity of 40 as a refrigerant and lubricating oil containing no
A rotary compressor using, as a base oil, a polyol ester or polyvinyl ether having a temperature of 20 to 80 mm / s as a base oil, wherein a vane whose base material is made of steel is subjected to nitriding treatment, and iron nitride having Fe and N as components on a surface layer is provided. After forming the layer, heat treatment is performed in a treating agent in which at least one of an alkali metal chloride and an alkaline earth metal chloride is used as a main component and a glass component mainly containing silicon oxide and chromium coexist. And a vane formed by diffusing chromium in the iron nitride layer.

Further, the invention according to claim 2 of the present invention is provided with a refrigeration circuit in which a compressor, a condenser, an expansion device, an evaporator and the like are sequentially connected by piping, and a refrigerant and a lubrication system which do not contain chlorine in molecules. 20-80mm / s kinematic viscosity at 40 ° C as oil
A rotary compressor using a polyol ester or polyvinyl ether as a base oil, wherein a vane made of steel is subjected to nitriding treatment, and an iron nitride layer (compound layer) containing Fe and N as components is formed on the outermost surface. After the formation, heat treatment in a treating agent in which at least one of an alkali metal chloride and an alkaline earth metal chloride as a main component and silicon oxide as a main component and a glass component and chromium coexist, A rotation characterized by comprising a vane that diffuses chromium into the iron nitride layer and removes at least a part or all of the iron nitride layer that diffuses chromium, except for at least the side of the vane that is in contact with the roller. It is a compressor.

According to a third aspect of the present invention, there is provided a refrigeration circuit in which a compressor, a condenser, an expansion device, an evaporator and the like are sequentially connected by piping, and a refrigerant and a lubrication system containing no chlorine in the molecule. 20-80mm / s kinematic viscosity at 40 ° C as oil
Is a rotary compressor using a polyol ester or polyvinyl ether as a base oil, wherein a vane made of steel is subjected to sulphonitriding treatment and an iron sulfide layer containing Fe and S as components on the outermost surface (compound) Layer) and a diffusion layer containing Fe and N below the iron sulfide layer.
Heat treatment is performed in a treatment agent containing at least one of an alkali metal chloride and an alkaline earth metal chloride as a main component, and a glass component mainly containing silicon oxide and chromium, to form an iron nitride layer in the iron nitride layer. A rotary compressor having a vane formed by diffusing chromium.

According to a fourth aspect of the present invention, there is provided a refrigeration circuit in which a compressor, a condenser, an expansion device, an evaporator, and the like are sequentially connected by piping, and a refrigerant and a lubrication system containing no chlorine in molecules. 20-80mm / s kinematic viscosity at 40 ° C as oil
Is a rotary compressor using a polyol ester or polyvinyl ether as a base oil, wherein a vane made of steel is subjected to sulphonitriding treatment and an iron sulfide layer containing Fe and S as components on the outermost surface (compound) Layer) and a diffusion layer containing Fe and N below the iron sulfide layer.
Heat treatment is performed in a treatment agent containing at least one of an alkali metal chloride and an alkaline earth metal chloride as a main component, and a glass component mainly containing silicon oxide and chromium, to form an iron nitride layer in the iron nitride layer. A rotary compressor comprising a vane that diffuses chromium and removes a part or all of an iron nitride layer in which chromium is diffused, except for at least a side of a sliding contact surface of the vane with a roller.

According to a fifth aspect of the present invention, in the rotary compressor according to any one of the first to fourth aspects, the base material of the vane has a longitudinal elastic modulus of 1.96 × 10 ^{5 to} 2.45.
It is characterized by being formed of an iron-based material of × 10 ⁵ N / mm ² .

According to a sixth aspect of the present invention, in the rotary compressor according to any one of the first to fifth aspects, a material of a roller that slides on the vane has a longitudinal elastic coefficient of 9.81 ×. It is characterized by being formed of an iron-based material of 10 ^{4 to} 1.47 × 10 ⁵ N / mm ² .

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below in detail. FIG. 4 shows an evaporated HF using a polyol ester or polyvinyl ether as a lubricating base oil.
A rotary compressor a of the present invention for compressing a refrigerant containing no chlorine molecules in molecules such as a C-based refrigerant, a condenser b for condensing and liquefying the refrigerant, an expansion device c for reducing the pressure of the refrigerant, and evaporating the liquefied refrigerant. An example of a refrigeration circuit formed by sequentially connecting evaporators d and the like with a refrigerant pipe is shown.

The base oil of the lubricating oil used in the present invention is a polyol ester or polyvinyl ether having a kinematic viscosity at 40 ° C. of 20 to 80, preferably 25 to 75, more preferably 30 to 70 mm / s. Kinematic viscosity is 20mm / s
If it is less than 80 mm / s or more than 80 mm / s, the lubricating properties may be unsuitable, which is not preferred.

The polyol ester or polyvinyl ether used in the present invention is not particularly limited. Specific examples of polyol esters include, for example, pentaerythritol (PET), trimethylolpropane (TM
P) a polyol ester comprising a polyhydric alcohol such as neopentyl glycol (NPG) and a fatty acid having 6 to 10 carbon atoms, preferably a fatty acid having 7 to 9 carbon atoms, and more preferably a side chain fatty acid having 7 to 9 carbon atoms. Can be mentioned.

For the polyol ester or polyvinyl ether used in the present invention, tricresyl phosphate (TCP), epoxy made of glycidyl ether, carbodiimide, phenol-based antioxidant, benzotriazole-based copper deactivator alone, etc. Alternatively, two or more kinds can be added in combination. Other known additives may be added to the polyol ester or polyvinyl ether used in the present invention.

The amount of tricresyl phosphate (TCP) to be added is not particularly limited, but may be from 0.1 to
It is preferable to add 2.0% by mass. If it is less than this range, a phosphoric acid film is not formed properly by TCP, so that lubricity is reduced, wear occurs in a boundary lubrication region, and base oil is deteriorated. Exceeding this range causes corrosion and abrasion due to TCP, and decomposed products of TCP adversely affect the base oil to accelerate the deterioration of the base oil.

The amount of the glycidyl ether epoxy added is not particularly limited, but may be 0.01 to 1 with respect to the lubricating oil.
It is preferable to add 0% by mass. If it is less than this range, the effect of the epoxy will not be exhibited, resulting in poor thermochemical stability. If it exceeds this range, the epoxy may polymerize, become sludge and deposit.

The amount of carbodiimide added is not particularly limited, but it is preferable to add 0.01 to 10% by mass based on the lubricating oil. If it is less than this range, the effect of carbodiimide does not appear, so that the thermochemical stability is poor. If the amount exceeds this range, carbodiimide may polymerize, form sludge and accumulate, or deteriorate stability.

It is preferable to add a phenolic antioxidant as an additive to the lubricating oil for the purpose of preventing oxidative deterioration during long-term storage, the amount of which is 0.01 to 1.0% by mass, more preferably. It is 0.05 to 0.3% by mass.
Antioxidants include 2,6-di-t-butyl-paracresol, 2,6-di-t-butyl-phenol,
4,6-tri-t-butyl-phenol or the like can be used.

It is preferable to add a benzotriazole-based copper deactivator to the lubricating oil.
It is 100 ppm, more preferably 5 to 50 ppm. As the benzotriazole-based copper deactivator, for example, specifically, 5-methyl-1H-benzotriazole, 1-dioctylaminomethylbenzotriazole and the like can be used.

The steel of the base metal to which the present invention is applied is ordinary steel,
Low alloy steel, high alloy steel, austenitic steel and the like. In the present invention, first, a vane made of steel as a base material is subjected to nitriding treatment to form an iron nitride compound layer on the outermost surface, and at the same time, to form an iron nitride diffusion layer thereunder, or to perform nitriding treatment on the vane. Either only an iron nitride diffusion layer is formed, or the vane is subjected to a nitriding treatment to form only an iron nitride compound layer on the outermost surface, or the vane is subjected to a sulfide nitriding treatment and an iron sulfide layer (compound layer) is formed on the outermost surface. ) And a diffusion layer containing Fe and N as components under the iron sulfide layer (hereinafter, may be referred to as a pretreated vane). The nitriding method and the sulphiding / nitriding method are not particularly limited, and various known methods can be used. Examples of the nitriding method include salt bath nitriding, salt bath nitrocarburizing, gas nitriding, gas nitrocarburizing, ion nitriding, carbonitriding,
Various methods such as an oxynitriding method and a combined treatment method of fluoridation and gas nitrocarburizing are exemplified. The conditions of each of these nitriding treatments and oxynitriding treatments are different depending on the nitriding method or the oxynitriding treatment method employed, as long as they are formed under a predetermined thickness on the surface of the pretreated vane, and are particularly limited. Not something.

A method in which the vane is subjected to a nitriding treatment to form only an iron nitride compound layer on the outermost surface, or a method in which the vane is subjected to a nitriding treatment to form an iron nitride compound layer on the outermost surface and at the same time an iron nitride diffusion layer is As a specific example of the forming method,
Examples thereof include a general ion nitriding method and a method described in JP-A-7-54123. Specific examples of the method of forming the iron nitride diffusion layer by subjecting the vane to nitriding treatment include a general radical nitriding treatment method and a method disclosed in
No. 245668 can be mentioned. The vane is subjected to nitrosulphurizing treatment and the outermost surface is made of Fe and S
As a specific example of a method of forming an iron sulfide layer (compound layer) containing as a component and forming a diffusion layer containing Fe and N as a component under the iron sulfide layer, for example, JP-A-10-16958
No. 1 can be mentioned.

According to the present invention, the pretreated vane is made to coexist with chromium and chromium containing silicon oxide as a main component and at least one of an alkali metal chloride and an alkaline earth metal chloride. Heat treatment is performed in the treatment agent (specifically, for example, heat treatment is performed by the method described in JP-A-11-158603).

As the alkali metal chloride, LiC
l, NaCl, KCl, RbCl, CsCl
BeCl as the alkaline earth metal chloride_Two ,
MgCl _Two , CaCl_Two , SrCl_Two , BaCl_Two , R
aCl_Two Is raised. These can be used alone or in combination
Can be used. These are mainly powdered
Or in the form of granules, which are heated and melted to form a salt bath.
It is suitable for easy processing. These are salt bath treatments
The medium that diffuses chromium into the surface layer of the pretreated vane
It is an intermediary.

As the chromium, industrial metal chromium is used. This metal chromium can be used in various forms such as powder, granule, fiber, etc., but powdered ones are particularly easy to obtain and inexpensive, and easy to dissolve and mix in a salt bath. Therefore, it is preferably used. The particle size of the powder is preferably 50 mesh or less, and more preferably 200 mesh or less. 5
If the mesh size exceeds 0 mesh, the dissolution and dispersion in the salt bath cannot be performed uniformly, so that it is difficult to form a stable chromium-enriched layer. Also, not limited to powder and the like, a rod-like or plate-like chromium material is immersed in a molten salt bath as an anode,
Electrolytic melting may be performed. The chromium is melted in the salt bath and diffuses into the pretreated vane surface layer, thereby replacing the iron in the iron nitride layer and forming a hardened film having a higher chromium concentration than the base metal.

The content of chromium in the treating agent is 3 to
It is preferably 30% by mass, and more preferably 15 to 20% by mass. If the amount is less than 3% by mass, the substitution reaction between chromium and iron hardly occurs, and a hardened film is hardly formed.
If the amount is more than 10% by mass, undissolved chromium accumulates in the treatment tank, the effect of which becomes flat, and the fluidity of the salt bath deteriorates, making it difficult to form a uniform cured film. Further, since the amount of the processing agent attached to the processing component increases, the carry-out amount increases, which is very uneconomical.

As the glass containing silicon oxide as a main component, various glasses are used as long as the glass contains silicon oxide (SiO ₂ ) as a main component, and there is no particular limitation. For example, various silicate glasses such as silicate glass, alkali silicate glass, soda lime glass, potassium lime glass, lead glass, barium glass, and borosilicate glass, and pure silicon oxide for industrial use may be used. They are,
They can be used alone or in combination. Further, the content of silicon oxide as a main component is preferably 80% by mass or more, and more preferably 95% by mass or more. 8
If the content is less than 0% by mass, the contamination of other impurities increases, and the effect of stabilizing the basicity of the salt bath is reduced. In addition, since the effect of activating chromium ions is adversely affected, chromium is contained in the iron nitride layer. This is because it is difficult to diffuse. Among these, in particular, pure silicon oxide having a purity of 99% by mass or more is suitably used because the stabilization of the basicity appears remarkably, and it is easily available and easy to handle.

The glass containing silicon oxide as a main component is
It can be used in powder form, granular form, fibrous form, liquid form, etc. In particular, powder form is easy to obtain and inexpensive, and can be uniformly mixed into treatment agents, and is easy to handle. Therefore, it is preferably used. The particle size of the powder in the salt bath is preferably 1000 μm or less,
It is more preferable that the thickness be 50 μm or less. 1000 μm
When it exceeds, it becomes difficult to uniformly disperse in the treating agent, and it remains in the salt bath as a lump.

The glass containing silicon oxide as a main component is contained in a salt bath comprising a chloride such as an alkali metal and chromium to stabilize the basicity of the salt bath and thermodynamically activate the chromium ion. Chromium in the iron nitride layer, facilitating the surface hardening.

The content of glass containing silicon oxide as a main component in the treatment agent is preferably 1 to 40% by mass,
If it is 0 to 20% by mass, it is more preferable. If the amount is less than 1% by mass, the effect of adding the silicon oxide to stabilize the basicity cannot be sufficiently obtained, so that it becomes difficult to diffuse chromium into the iron nitride layer. On the other hand, if the content exceeds 40% by mass, the viscosity of the salt bath becomes too high, so that the treatment agent is taken out more frequently, which causes processing unevenness and clogging of holes.

The above-mentioned treating agents may further include metal carbides, alkali metal carbides, alkaline earth metal carbides, alkali metal hydrides, alkaline earth metal hydrides, alkali metal hydroxides, alkaline earth metal Compounds such as hydroxides, manganese powders, silicon powders and titanium powders can be added alone or in combination.

In the present invention, for example, the surface treatment of the pretreated vane is performed as follows. First, a treatment agent is adjusted by mixing a chloride such as an alkali metal, a glass component mainly composed of silicon oxide, chromium, and the like at a predetermined mixing ratio. The treatment agent is further mixed with carbides such as metal carbides and alkali metals, hydrides, hydroxides and compounds such as manganese powders, silicon powders and titanium powders.

Next, the treating agent adjusted as described above is put into, for example, a treatment tank of a salt bath furnace, and heated and melted by a heater to form a salt bath. Then, the pretreated vane is immersed in the salt bath and heated and held for a predetermined time. At this time, the heating temperature is 500 to 700 ° C.
It is preferable to set If the temperature is lower than 500 ° C., the treatment efficiency is deteriorated and a stable cured film is hardly formed. In addition, since the treatment agent does not melt, it is difficult to perform the salt bath treatment. On the other hand, when the temperature exceeds 700 ° C., the erosion of the treated layer becomes severe, and the pretreated vane is softened to lower the strength. The processing time varies depending on the processing temperature and the thickness or depth of the cured film to be formed.
It is about several hours to several tens of hours.

By performing the salt bath treatment in this manner,
The chromium melted in the treatment agent diffuses into the iron nitride layer of the pretreated vane, causing a substitution reaction between iron and chromium in the iron nitride layer, increasing the chromium concentration in that portion, and increasing the base metal Thus, a cured film having a high chromium concentration is formed.
It is considered that this cured film exhibits very high hardness and extremely excellent wear resistance. And according to the present invention,
Since the treating agent contains a glass component containing silicon oxide as a main component, chromium is easily diffused into the iron nitride layer, so that surface hardening can be achieved.

In the above embodiment, the so-called molten salt bath treatment in which the treatment agent is heated and melted and the pretreated vane is immersed has been described. However, the present invention is not limited to this. Instead, the so-called molten salt electrolysis method in which the pretreated vane is immersed in the molten salt bath as a cathode and electrolyzed, or the pretreated vane is held in a powdery treatment agent and heated. So-called powder pack method, so-called paste method in which a powdery treating agent is mixed with a binder to form a paste, and this paste is applied to the treated portion of the pretreated vane and then heated, or in a powder state In a fluidized-bed furnace, the gas is blown into and fluidized, and the pretreated vane is heated and held in the fluidized-bed furnace. Can be also same effect as the above by respective methods.

[0040]

The rotary compressor according to the first aspect of the present invention has the following features.
Even if polyol ester or polyvinyl ether is used as a base oil as a refrigerant and a lubricant containing no chlorine in the molecule, a vane made of steel is subjected to nitriding treatment to form an iron nitride layer on the surface layer (formed on the outermost surface) An iron nitride compound layer and an iron nitride diffusion layer formed thereunder).
By replacing the Fe component of the iron nitride layer with Cr and changing it to a compound composed of CrN, or by performing a nitriding treatment to form only an iron nitride diffusion layer, and changing the Fe component of the diffusion layer to C
By replacing it with a compound consisting of CrN by substituting with r, the problem of peeling off of the cured film as in the case of coating is eliminated, and a vane having high abrasion resistance is provided similarly to conventional CrN coating, so that high reliability is provided. Is obtained.

In the rotary compressor according to the second aspect of the present invention, the vane whose base material is made of steel can be used even if a polyol ester or polyvinyl ether is used as a base oil as a refrigerant and a lubricant containing no chlorine in the molecule. A nitriding treatment is performed to form an iron nitride layer (compound layer) on the outermost surface.
By replacing the e component with Cr to change to a compound composed of CrN, and removing at least a part or all of the iron nitride layer diffused with chromium except for at least the sliding contact surface side of the vane with the roller, the vane is particularly improved. At least a hardened film is provided at the tip, which is the sliding part of the roller where high proof stress is required, to cope with dimensional changes caused by changes in crystal structure due to nitriding, etc. Even if the iron nitride layer in which chromium is diffused is removed, the desired high wear resistance vane can be obtained, the problem of peeling of the cured film as in the case of coating is eliminated, and the high wear resistance is the same as in the conventional CrN coating. The provision of the vanes having the proof stress has a remarkable effect that high reliability can be obtained.

In the rotary compressor according to the third aspect of the present invention, even when a refrigerant containing no chlorine in the molecule and a polyol ester or polyvinyl ether as a base oil are used as a base oil, a vane whose base material is made of steel is used. By performing oxynitriding treatment, an iron sulfide layer (compound layer) containing Fe and S is formed on the outermost surface, and a diffusion layer containing Fe and N is formed thereunder, and the Fe component of the iron nitride layer is formed. By replacing Cr with C
By changing to a compound consisting of rN, the problem of peeling of the cured film as in the case of the coating is eliminated, and since a vane having high abrasion resistance is provided similarly to the conventional CrN coating, high reliability is obtained. Effect.

The rotary compressor according to the fourth aspect of the present invention provides a vane whose base material is made of steel even when a polyol containing no chlorine in the molecule and a polyol oil or polyvinyl ether is used as a base oil as a lubricating oil. By performing oxynitriding treatment, an iron sulfide layer (compound layer) containing Fe and S is formed on the outermost surface, and a diffusion layer containing Fe and N is formed thereunder, and the Fe component of the iron nitride layer is formed. By replacing Cr with C
By changing to a compound consisting of rN and removing at least a part or all of the iron nitride layer diffused with chromium except for at least the sliding contact surface side of the vane with the roller, the vane is required to have a particularly high proof stress. At least a hardened film is provided at the tip, which is the sliding contact part, and in response to dimensional changes caused by changes in crystal structure due to nitrosulphurizing treatment, chromium diffused on the side surfaces of the vane by polishing for re-adjustment of dimensions Even if the iron nitride layer is removed, the desired vane with high wear resistance is obtained, the problem of peeling of the cured film is eliminated as in the case of coating, and a vane having high wear resistance is provided like the conventional CrN coating. Therefore, there is a remarkable effect that high reliability can be obtained.

In the rotary compressor according to a fifth aspect of the present invention, the base material of the vane has a longitudinal elastic modulus of 1.96 × 10 ^{5 to} 2.45 ×.
Since it is formed of an iron-based material of 10 ⁵ N / mm ² , it has a remarkable effect of having high wear resistance and obtaining high reliability. If the longitudinal elastic modulus is too small, the wear resistance of the vane is insufficient, and if it is too large, elastic deformation cannot be expected,
Since the stress cannot be reduced, high wear resistance cannot be obtained.

In the rotary compressor according to the sixth aspect of the present invention, the material of the roller in sliding contact with the vane has a longitudinal elastic coefficient of 9.81 ×.
Since it is formed of an iron-based material of 10 ^{4 to} 1.47 × 10 ⁵ N / mm ² , it has a remarkable effect of having high wear resistance and high reliability. If the longitudinal elastic modulus is too small, the abrasion resistance of the roller is insufficient, and if it is too large, elastic deformation cannot be expected and the stress between the vane and the roller cannot be reduced, so that a high abrasion resistance cannot be obtained.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a cross-sectional structure of a two-cylinder rotary compressor to which the present invention is applied.

FIG. 2 shows a cylinder, a roller, and the like of the rotary compressor shown in FIG.
It is sectional explanatory drawing which shows the relationship of a vane etc.

FIG. 3 is an explanatory view of a vane of the rotary compressor shown in FIG.

FIG. 4 is an explanatory diagram showing a refrigeration circuit of the rotary compressor shown in FIG.

[Explanation of symbols]

 a rotary compressor b condenser c expansion device d evaporator 1 rotary compressor 31, 32 cylinder 23 suction port 35 discharge port 26 crank section 38 roller 40 vane

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masazo Okajima 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Kazuhisa Ishikawa 2-chome Keihanhondori, Moriguchi-shi, Osaka No. 5-5 Sanyo Electric Co., Ltd. (72) Inventor Tsuyoshi Higuchi 2-5-2-5 Keihanhondori, Moriguchi-shi, Osaka Pref. Sanyo Electric Co., Ltd. (72) Inventor Tohru Ito Keihanhondori, Moriguchi-shi, Osaka 2-5-5 Sanyo Electric Co., Ltd. (72) Inventor Dai Matsuura 2-5-5 Keihanhondori, Moriguchi-shi, Osaka F-term in Sanyo Electric Co., Ltd. 3H029 AA04 AA13 AB03 BB01 BB31 CC38

Claims (6)

[Claims] 1. A refrigeration circuit comprising a compressor, a condenser, an expansion device, an evaporator, and the like connected in series by a pipe, and a kinematic viscosity of 20 to 40 ° C. as a refrigerant containing no chlorine in molecules and a lubricating oil. A rotary compressor using a polyol ester or polyvinyl ether having a speed of 80 mm / s as a base oil.
After forming an iron nitride layer containing e and N as components, at least one of an alkali metal chloride and an alkaline earth metal chloride is formed.
A heat treatment in a treatment agent in which chromium coexists with a glass component containing silicon oxide as a main component, and a vane formed by diffusing chromium into the iron nitride layer. Rotary compressor. 2. A refrigerating circuit comprising a compressor, a condenser, an expansion device, an evaporator, and the like connected in series by a pipe, and has a kinematic viscosity of 20 to 40.degree. A rotary compressor using a polyol ester or polyvinyl ether having a speed of 80 mm / s as a base oil, wherein a vane made of steel is subjected to nitriding treatment, and an iron nitride layer containing Fe and N as components on the outermost surface (compound) Layer), and then heat-treated in a treating agent containing at least one of an alkali metal chloride and an alkaline earth metal chloride as a main component, a glass component containing silicon oxide as a main component, and chromium. And a vane formed by diffusing chromium into the iron nitride layer and removing at least a part or all of the iron nitride layer diffused with chromium, except for at least a side of the vane in contact with a roller. Times Rolling compressor. 3. A refrigeration circuit in which a compressor, a condenser, an expansion device, an evaporator, and the like are sequentially connected by piping, and a kinematic viscosity of 20 to 40 ° C. as a refrigerant containing no chlorine in molecules and a lubricating oil. A rotary compressor using a polyol ester or polyvinyl ether having a speed of 80 mm / s as a base oil, wherein a vane made of steel is subjected to nitrosulphurizing treatment and iron sulfide containing Fe and S as components on the outermost surface. After forming a layer (compound layer) and a diffusion layer containing Fe and N below the iron sulfide layer, at least one of an alkali metal chloride and an alkaline earth metal chloride is used as a main component. A rotary compressor comprising a vane obtained by heat-treating in a treating agent in which glass containing silicon oxide as a main component and chromium coexist to diffuse chromium into an iron nitride layer. 4. A refrigeration circuit comprising a compressor, a condenser, an expansion device, an evaporator, and the like connected in order by a pipe, and has a kinematic viscosity of 20 to 40 ° C. as a refrigerant containing no chlorine in molecules and a lubricating oil. A rotary compressor using a polyol ester or polyvinyl ether having a speed of 80 mm / s as a base oil, wherein a vane made of steel is subjected to nitrosulphurizing treatment and iron sulfide containing Fe and S as components on the outermost surface. After forming a layer (compound layer) and a diffusion layer containing Fe and N below the iron sulfide layer, at least one of an alkali metal chloride and an alkaline earth metal chloride is used as a main component. Heat treatment in a treatment agent coexisting with glass and chromium containing silicon oxide as a main component, diffuses chromium into the iron nitride layer, and diffuses chromium except for at least the sliding surface side of the vane with the roller. Iron nitride layer A rotary compressor comprising a vane partially or entirely removed. 5. The vane base material has a longitudinal elastic modulus of 1.96.
The rotary compressor according to any one of claims 1 to 4, wherein the rotary compressor is formed of an iron-based material of × 10 ^{5 to} 2.45 × 10 ⁵ N / mm ² . 6. A material of a roller that is in sliding contact with the vane,
Longitudinal modulus of elasticity 9.81 × 10 ^{4 to} 1.47 × 10 ⁵ N / m
rotary compressor according to any one of claims 1 to 5, characterized in that it is formed of a ferrous material m ^2.