JP2001342981A - Rotary compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary compressor which has excellent wear resistance and can be used for R134a refrigerant, R22 refrigerant, and R22 substitute refrigerant. SOLUTION: A vane 1 is inserted into a groove formed in a radial direction of a cylinder, slides on an outer peripheral surface of a roller, and retreats to partition the inside of the cylinder into a suction portion side and a discharge portion side.
5 is obtained by molding and sintering a quench-hardenable iron-based powder material containing 9% to 27% of Cr and 0.4% or more of C
The base B1 of the base material is formed into a martensite structure by quenching and tempering, using a sintered iron having a 9 ratio of 15% or less as a base material. The configuration is formed. Cr amount 9
%, The wear resistance of the Fe—N layer 20 and the nitrogen diffusion layer 21 is improved, and the porosity is reduced to 15% or less, the dimensional distortion is reduced, and the strength is reduced by nitriding. And embrittlement is also reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary compressor, and more particularly to a rotary compressor suitable for an HFC refrigerant as an R22 refrigerant, an R134a refrigerant, or an R22 substitute refrigerant.

[0002]

2. Description of the Related Art As shown in FIGS. 8 and 9, a conventional rotary compressor has a motor unit 2 and a compressor unit 3 disposed inside a sealed container 1, and is directly connected to the motor unit 2. The shaft 4 includes main bearings 5 provided above and below the compressor unit 3.
And the auxiliary bearing 6. In the compressor unit 3, a suction hole 8 is formed on a side surface of a cylinder 7 provided concentrically with the shaft 4, and a discharge notch 9 is formed on an upper portion. One end of a suction pipe 10 is connected to the suction hole 8 and the closed container 1
One end of a discharge pipe 12 is connected to a discharge port 11 formed at the top of the container, and the other end of the suction pipe 10 and the other end of the discharge pipe 11 are connected to an accumulator (not shown), respectively. The refrigerant circulates inside and outside. L is a refrigerating machine oil as a lubricating oil added to the refrigerant and liquefied in the closed container 1.

[0003] Inside the cylinder 7, there is disposed a roller 13 eccentrically mounted on the shaft 4 and performing a planetary movement with the rotation of the shaft 4. A guide groove 14 is formed in the cylinder 7 between the suction hole 8 and the discharge notch 9 in the radial direction of the cylinder, and a plate-like vane 15 inserted in the guide groove 14 applies an urging force of a spring 16. And the back pressure (discharge pressure), the roller 13
To partition the space inside the cylinder 7 into a suction chamber 17 and a compression chamber 18.

[0004] With such a configuration, the roller 13 moves in a planetary manner inside the cylinder 7 along the inner wall, and the vane 15 pressed against the outer wall of the roller 13 accordingly moves the guide groove 1.
In the interior of the cylinder 4, the cylinder 7 moves in the radial direction of the cylinder 7, the gas is sucked into the suction chamber 17 partitioned by the vane 15 through the suction port 8, the sucked gas is compressed in the compression chamber 18, and the discharge notch is formed. It is discharged into a predetermined space via 37.

In general, the vane 15 is manufactured by subjecting a special iron-based soluble material having excellent wear resistance to a heat treatment, and after the heat treatment, performing a grinding finish and a nitriding treatment for forming a nitrogen diffusion layer and a compound layer. However, in this case, the compound layer at the tip of the vane 15 is left and the cylinder 7
The side part that slides on the surface is ground and precision finished to achieve dimensional accuracy.

[0006]

However, in the vane 15 described above, since the nitrogen diffusion layer on the side portion exposed by the precision finishing is a single layer, the vane 15 cannot hold the refrigerating machine oil, and the cylinder 7 and the vane 15 have a high durability. The result is that the abrasion is slightly inferior. Further, since a special iron-based soluble material is used, there is also a problem that the entire surface is required to be processed and the processing cost is extremely high.

On the other hand, in recent years, the cylinder 7, the roller 1
3. The sliding conditions of the vane 15 are becoming stricter, and as the refrigerant is replaced with R22 (monochlorodifluoromethane) substitute refrigerant, a combination of materials having higher wear resistance has been required. That is, if the special steel, the special casting, and the iron-based sintered material are used alone as in the conventional vane 15, the wear resistance is insufficient, and the vane formed of the special iron-based soluble material as described above is used. It has come to be said that, even if the finishing 15 is processed and nitrided, the wear resistance of the cylinder 7 and the vanes 15 is not sufficient.

An object of the present invention is to solve the above-mentioned problem, and to provide a rotary compressor having excellent wear resistance at low cost.

[0009]

In order to solve the above problems, the present invention improves the wear resistance of the Fe—N layer and the nitrogen diffusion layer by setting the Cr content to 9% (mass) or more. It was made. Further, by setting the porosity to 15% or less, nitrogen gas is prevented from penetrating deeply into the vane during the nitriding treatment, and dimensional distortion, reduction in strength, and embrittlement are reduced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 is a cylinder having a suction portion and a discharge portion for a refrigerant, a roller rolling along the inner peripheral surface of the cylinder, and A rotary compressor including a vane inserted into the formed groove portion and reciprocating while sliding on the outer peripheral surface of the roller to partition the inside of the cylinder into the suction portion side and the discharge portion side; Vane, Cr 9% -27%,
A base of the base material is quenched and tempered using sintered iron having a porosity of 15% or less as a base material by molding and sintering a quench-hardening iron-based powder material containing 0.4% or more of C. It is characterized in that a martensite structure is formed by the treatment, and a Fe-N layer and a nitrogen diffusion layer are formed on the surface in order from the surface layer by a nitriding treatment. The term nitriding includes nitrocarburizing.

According to this structure, the Cr content of the vane is reduced to 9%.
With the above, the wear resistance of the Fe—N layer is improved and the wear resistance of the nitrogen diffusion layer is dramatically improved. If the Cr content exceeds 27% or is less than 0.4%, the martensite organization becomes insufficient. Further, by setting the porosity to 15% or less, it is possible to prevent nitrogen gas from penetrating deeply into the vane during nitriding or nitrocarburizing treatment, to reduce dimensional distortion, and to reduce strength due to nitriding. Occurrence is reduced and embrittlement is also reduced.

According to a second aspect of the present invention, in the rotary compressor of the first aspect, the iron-based powder material is SUS440.
A, SUS440B, SUS440C, SKD1, SK
D11.
This is a preferred embodiment.

According to a third aspect of the present invention, there is provided a cylinder having a suction portion and a discharge portion for a refrigerant, a roller rolling along an inner peripheral surface of the cylinder, and a groove formed in the cylinder in a radial direction. A rotary vane having a vane inserted into the cylinder and sliding back and forth with respect to the outer peripheral surface of the roller to partition the inside of the cylinder into the suction portion side and the discharge portion side. % To 27%, Ni 4%
A base of sintered iron having a porosity of 15% or less obtained by molding and sintering a precipitation hardening iron-based powder material containing -8% and C of 0.2% or less, and heat-treating the base of the base material. To form a martensite structure, and nitriding the surface to form Fe
The present invention is characterized in that a -N layer and a nitrogen diffusion layer are formed in order from the surface layer. The term nitriding includes nitrocarburizing.

According to this structure, the Cr content of the vane is reduced to 9%.
With the above, the wear resistance of the Fe—N layer is improved and the wear resistance of the nitrogen diffusion layer is dramatically improved. If the Cr content exceeds 27% or is less than 0.4%, the martensite organization becomes insufficient. Further, by setting the porosity to 15% or less, it is possible to prevent nitrogen gas from penetrating deeply into the vane during nitriding or nitrocarburizing treatment, to reduce dimensional distortion, and to reduce strength due to nitriding. Occurrence is reduced and embrittlement is also reduced.

According to a fourth aspect of the present invention, in the rotary compressor of the third aspect, the iron-based powder material is SUS630,
SUS631, which is a preferred embodiment.

According to a fifth aspect of the present invention, in the rotary compressor according to any one of the first to fourth aspects, the sintered iron is formed by solid phase sintering or liquid phase sintering. In order to reduce the porosity to 15% or less, a liquid phase sintering material is usually used, but solid phase sintering is also possible depending on additives and sintering conditions.

According to a sixth aspect of the present invention, in the rotary compressor according to any one of the first to fifth aspects, the side surface of the vane sliding in the groove of the cylinder is formed of nitrogen exposed by grinding. The diffusion layer is characterized as a main sliding surface, and by this configuration, the refrigerating machine oil is securely held by the compound layer also formed on the inner surface of the pores of the nitrogen diffusion layer, and the vane and the cylinder A very good vane sliding surface against adhesive wear.

According to a seventh aspect of the present invention, in the rotary compressor according to any one of the first to fifth aspects, the side surface of the vane sliding in the groove of the cylinder is formed of nitrogen exposed by grinding. The sliding surface is characterized by a mixed structure of the diffusion layer and the Fe-N layer. With this configuration, a gap is generated between the Fe-N layer and the nitrogen diffusion layer due to sliding wear. Since the refrigerating machine oil is held in the gap, a vane sliding surface which is very excellent against cohesive wear between the vane and the cylinder is obtained.

According to an eighth aspect of the present invention, in the rotary compressor according to any one of the first to fifth aspects, the side surface of the vane sliding in the groove of the cylinder is made of Fe exposed by grinding. According to this configuration, the Fe-N layer has a structure that is extremely resistant to metal adhesion. Very good vane sliding surface.

According to a ninth aspect of the present invention, in the rotary compressor according to any one of the first to eighth aspects, the tip end of the vane sliding on the roller has an Fe-N layer as a sliding surface. According to this configuration,
Due to the effect of the chromium nitride contained in the Fe—N layer in the vane material having Cr of 9% or more, the wear resistance becomes very excellent.

According to a tenth aspect of the present invention, in the rotary compressor according to any one of the first to eighth aspects, the tip of the vane sliding on the roller has a surface roughness exposed by grinding. The present invention is characterized in that an Fe-N layer having a thickness of 3 μm or less is used as a sliding surface. According to this configuration, a fine projection is formed by sliding on a roller with an Fe-N layer having a surface roughness of 3 μm or less. A large stress is hardly applied to the portion, and it is extremely difficult to adhere to the metal, so that the vane sliding surface is very excellent against the abrasion and adhesion of the vane and the roller.

According to the eleventh aspect of the present invention, in the rotary compressor according to any one of the first to tenth aspects,
The nitriding treatment is a gas nitriding or gas nitrocarburizing treatment, and any of them can favorably form an Fe—N layer and a nitrogen diffusion layer.

According to a twelfth aspect of the present invention, in the rotary compressor according to any one of the first to eleventh aspects,
The nitrogen diffusion layer is characterized by being formed with a thickness of 0.05 mm or more at a nitriding temperature of 500 ° C. to 580 ° C.
-The thickness of the N layer and the nitrogen diffusion layer can be made possible, and the wear resistance of the nitrogen diffusion layer can be ensured even after grinding.

According to a thirteenth aspect of the present invention, in the rotary compressor according to any one of the first to twelfth aspects,
An oxide film is formed on the surface of the sintered iron including the pores by a steam treatment. With this structure, the oxide film ( It can be easily nitrided by the presence of ferric oxide film.

According to a fourteenth aspect of the present invention, in the rotary compressor according to any one of the first to thirteenth aspects,
Rollers are Cr 0.5% -1.0%, Mo 0.2%-
It is characterized by being made of a cast iron material containing 0.4% and P 0.1% to 0.4%.
Rollers made of cast iron having the optimum component content of o and P have extremely high wear resistance.

According to a fifteenth aspect of the present invention, in the rotary compressor according to any one of the first to thirteenth aspects,
Rollers are Cr 0.5% -1.0%, Mo 0.2%-
It is characterized by being made of a cast iron material containing 0.4% and B of 0.02% to 0.1%.
A roller made of a cast iron material having the optimum content of Mo and P has extremely high wear resistance.

According to a sixteenth aspect of the present invention, in the rotary compressor according to any one of the first to fifteenth aspects,
The refrigerant is HFC, and is characterized by the addition of an ester oil as a refrigerating machine oil, and high reliability can be realized also with respect to HFC as an alternative CFC refrigerant.

[0028] According to a seventeenth aspect of the present invention, in the rotary compressor according to any one of the first to sixteenth aspects,
The refrigerant is R32. In the above description, the Fe—N layer is composed of Fe ₂ N, Fe _2-3 N,
A nitrogen diffusion layer refers to a layer in which a nitride such as Fe ₃ N is formed, and a nitrogen diffusion layer refers to a supersaturated solid solution in which N is dissolved in Fe or a diffusion layer in which a hard nitride of an alloy element is present. Also,
HFC is hydrofluorocarbon and R32 is difluoromethane.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. (Embodiment 1) The rotary compressor according to Embodiment 1 of the present invention has substantially the same configuration as that of the conventional rotary compressor described with reference to FIGS. The description of the overall configuration and operation is omitted.

The rotary compressor according to the first embodiment is different from the conventional rotary compressor in the configuration of the cylinder 7 including the guide groove 14, the roller 13, and the vane 15. That is, the cylinder 7 has a pearlite of 10-50.
% Eutectic graphite cast iron. Roller 13
Are Cr 0.8%, Ni 0.2%, Mo 0.2%, P
It is made of alloy cast iron to which 0.2% is added, and quenched and tempered.

The vane 15 is shown in a top view and a side view in FIGS. 1 (a) and 1 (b). The vane 15 has a plurality of holes at a porosity of 15% or less, and a tip end. The part 15a and the side part 15b have layers formed as follows.

A method for forming the vane 15 will be described. First,
A base material having a porosity of 15% or less by forming and solid-phase sintering a quench-hardenable powdered martensitic stainless steel containing 16.0 to 18.0% of Cr and 0.95 to 1.2% of C. Then, the base material is quenched and tempered to form a martensite structure in the matrix, and then, is ground to finish the tip portion 15a and the side portion 15b.

Next, the finished base material is 560-570
2 and 3 (a) and 3 (b), a nitriding treatment (or a nitrocarburizing treatment) is performed at the base B having holes 19 as shown in FIGS.
Next, a compound layer 20 as a Fe—N layer and a nitrogen diffusion layer 21 are arranged in this order from the surface layer, and the side surface portion 15b is further ground to remove the compound layer 20, and as shown in FIG. The nitrogen diffusion layer 21 is exposed. The thickness of the nitrogen diffusion layer 21 is equal to 0.
It should be at least 05 mm.

The vane 15 has a Cr content of 16.
By being 0% to 18.0%, the wear resistance of the compound layer 20 at the tip 15a is improved and the wear resistance of the nitrogen diffusion layer 21 (adhesive wear resistance) as compared with the conventional one.
Is greatly improved.

Further, since the porosity is 15% or less, the nitrogen gas does not penetrate deeply into the vane 15 during the nitriding (or soft nitriding) treatment, so that the dimensional distortion is reduced. Reduction in strength and brittleness are suppressed.
Conversely, if all pores are continuous, the strength is reduced and the embrittlement occurs, so that not only operation under actual use conditions becomes impossible, but also the nitrogen gas diffuses throughout the vane 15 during the nitriding treatment, and the vane 15 Large distortion occurs, making it unusable. Therefore, setting the porosity to 15% or less is a very important factor.

In addition, the nitriding conditions are set at 560 ° C. to 570 ° C.
C., the compound layer 20 and the nitrogen diffusion layer 21 are formed stably, and stable wear resistance is exhibited. In addition, since the nitrogen diffusion layer 21 has a thickness of 0.05 mm or more, the wear resistance of the nitrogen diffusion layer 21 is stable. Nitriding temperature is 500
If the temperature is lower than 580 ° C., the formation of the compound layer 20 becomes difficult, and the formation of the nitrogen diffusion layer 21 also becomes difficult.

Further, since the holes 19 are scattered,
As shown in an enlarged view in FIG. 4, since the intra-cavity compound layer 22, which is an Fe—N layer, is also formed on the inner wall of the pore 19 during the nitriding treatment, the refrigerating machine oil L is retained in the pore 19 and retained. The refrigerating machine oil L is supplied to the sliding surface when the vane 15 slides, and the wear resistance is improved. Even when some continuous holes are formed, the intra-hole compound layer 22 functions as a seal, and the pressure applied in the cylinder 7 and the refrigerating machine oil L do not escape. The oil pressure is maintained, and the wear resistance is further improved.

Therefore, the vane 15 has a sufficient strength and the tip 15 provided with the compound layer 20 having good abrasion resistance.
As for a, the adhesive wear on the outer peripheral surface 13a of the roller 13 hardly occurs even under severe sliding conditions, and the nitrogen diffusion layer 21 on the side surface portion 15b is also excellent in wear resistance. Roller 1
Sample No. 3 is also extremely excellent in wear resistance due to the components Cr, Mo and P, and very excellent in hardenability due to Ni. Cylinder 7 has 15% pearlite in base B
Since it contains the above, the abrasion resistance is very good.

From these facts, the addition amount of the lubricating refrigerating machine oil L is small, and an oil film is hardly formed on the sliding surface between the guide groove 14 and the vane 15, and especially the refrigerant itself cannot be expected to have lubricity. The HFC refrigerant has severe sliding conditions, and the tip 15a of the vane 15 and the outer circumferential surface 13 of the roller 13
a also becomes a boundary lubrication state close to metal contact with little oil film,
High reliability can be realized in a rotary compressor under severe sliding conditions. (Embodiment 2) The rotary compressor of Embodiment 2 has substantially the same configuration as that of Embodiment 1, but differs in the following points.

The cylinder 7 is made of FC250 containing 95% or more of pearlite. The roller 13 is made of Cr
0.8%, Ni 0.2%, Mo 0.2%, B 0.04%
It is made of alloy cast iron to which is added, and is quenched and tempered.

The vane 15 has a Cr content of 16.0% to 18.0%.
%, Ni 6.50% to 7.75%, and C. 0.09% or less, by forming and solid-phase sintering a precipitation-hardenable SUS631, a base material having a porosity of 15% or less is prepared. After solution treatment and intermediate treatment of the base material,
Precipitation effect treatment is performed to make the matrix a structure in which martensite and precipitates are mixed, and then the front end portion 15a and the side surface portion 15b are finished by grinding. Then, after that, the compound layer 20 and the nitrogen diffusion layer 21 are formed on the base B1 by nitriding treatment (or nitrocarburizing treatment) as shown in FIGS. The tip part 15a of the vane 15 slidingly contacting leaves the compound layer 20, and the side surface part 15b of the vane 15 slidingly contacting the cylinder 7 grinds the compound layer 20 to form a nitrogen diffusion layer as shown in FIG. 21 are exposed.

The above configuration has the following advantages. The guide groove 14 of the cylinder 7 and the side of the vane 15 are subjected to severe sliding conditions.
Even when the leading end 15a of the vane 15 and the outer peripheral surface 13a of the roller 13 have sliding conditions close to metal contact with less oil, the leading end 15a of the vane 15 is a compound layer 20 having good wear resistance. Adhesive wear with the outer peripheral surface 13a is unlikely to occur, and the side surface portion 15b of the vane 15 is also hard to wear because the side surface portion 15b is the nitrogen diffusion layer 21. The roller 13 is also composed of the components Cr, Mo, B
Is very excellent in wear resistance, and Ni is very excellent in hardenability. Therefore, in combination with the vane 15, the wear resistance is very excellent. Since the cylinder 7 also contains 95% or more of pearlite in the base B1, the wear resistance is very good. From these, a highly reliable rotary compressor can be realized. (Third Embodiment) A rotary compressor according to a third embodiment has substantially the same configuration as that of the rotary compressor according to the first embodiment, but differs in the following points.

The roller 13 is made of 0.8% Cr, 0.2% Ni,
%, Mo0.2% and P0.3% are made of alloy cast iron and quenched and tempered. The cylinder 7 is an A-type flaky graphite cast iron FC250, and 90% of pearlite. It is created by including the above.

The vane 15 contains 0.95 to 1.2% of C,
The porosity is 1 by forming and solid-phase sintering a martensitic stainless steel containing 16.0 to 18.0% r.
A base material of 5% or less is prepared, the base material is quenched and tempered to form a martensite structure in the base, and then the tip portion 15a and the side portion 15b are finished by grinding. Then, after that, a nitriding treatment is performed at 560-570 ° C., and a tip portion 15a and a side portion 15b of the vane 15 are ground to form a compound layer 2 as shown in FIG. 6 (a).
Surface roughness Ry of about 1 μm while leaving 0
As shown in FIG. 6B, the compound layer 20 is also left on 5b. B1 is a base.

The above configuration has the following advantages. Since the tip 15a of the vane 15 has a surface roughness Ry of about 1 μm, even when the tip 15a contacts the roller 13 microscopically, the Hertzian stress is reduced, and the wear is not affected. Further, since the compound layer 20 is left at the tip 15a of the vane 15, adhesion and abrasion with the roller 13 is very unlikely to occur, and since the compound layer 20 is left on the side surface 15b, not only the side surface 15b but also the side surface 15b is used. The wear of the guide groove 14 of the cylinder 7 is extremely small. Further, since the refrigerating machine oil L is held in the holes 19 in the sliding surfaces of the tip portion 15a and the side surface portion 15b of the vane 15, the vane 15 has extremely excellent wear resistance.

With such a combination of the vane 15, the roller 13 and the cylinder 7, it is possible to realize a highly reliable compressor with a very small amount of wear. (Embodiment 4) The rotary compressor of Embodiment 4 has substantially the same configuration as that of Embodiment 3 but differs in the following points.

As shown in FIG. 7, by grinding the vicinity of the boundary between the compound layer 20 and the nitrogen diffusion layer 21, the vane 15
Has a texture in which the compound layer 20 and the nitrogen diffusion layer 21 are mixed.

Thus, a very hard tissue (compound layer 2)
0) and the hard tissue (nitrogen diffusion layer 21)
Is maintained, so that the wear resistance is further improved. (Fifth Embodiment) A rotary compressor according to a fifth embodiment has substantially the same configuration as that of the rotary compressor according to the third embodiment, but differs in the following points.

The vane 15 has a C content of 0.95 to 1.2%,
The porosity is 1 by forming and solid-phase sintering a martensitic stainless steel containing 16.0 to 18.0% r.
By forming a base material of 5% or less, quenching and tempering the base material to form a martensite structure of the base, and then performing steam treatment, as shown in FIG. Oxide film 2 made of ferric oxide
3 is formed.

Then, as in the third embodiment,
The tip portion 15a and the side portion 15b are finished by grinding, and nitriding is performed at 560-570 ° C.
0, a nitrogen diffusion layer 21 and an intra-vacancy compound layer 22;
By further grinding, the tip portion 15a has a surface roughness Ry of about 1 μm while leaving the compound layer 20, and the compound layer 20 also remains on the side surface portion 15b.

The above configuration has the following advantages. Cr as in vane 15 described above
In the case of a material containing a large amount of components and forming a chromium oxide film, it is difficult to perform nitridation only by ordinary nitriding treatment, and a pretreatment for removing the chromium oxide film with a hydrogen sulfide gas, a hooker nitrogen gas, or the like is required. By performing the steam treatment as described above, the pretreatment is not required or the time is short.

The compound layer 20 and the oxide film 2 in the pores are formed in the holes 19 of the compound layer 20 and the nitrogen diffusion layer 21 after the nitriding treatment.
Since a small amount of 3 remains, airtightness is improved,
Since triiron tetroxide constituting the oxide film 23 is porous, the ability to hold the refrigerating machine oil L is increased, and the wear resistance is improved.

The configurations of the third, fourth, and fifth embodiments can be realized by the base 2.

[0054]

As described above, according to the present invention, a porosity of 15% is obtained by molding and sintering an iron-based powder having a quench-hardening property of 9% to 27% Cr and 0.4% C or more. The following sintered iron, or Cr 9% to 27%, Ni 4% to 8%,
Using a sintered iron having a porosity of 15% or less as a base material obtained by molding and sintering an iron-based powder material having a precipitation-hardening property of 0.2% or less, the base thereof is formed into a martensite structure, and an Fe-N layer is formed on the surface. Since the structure in which the nitrogen diffusion layer is formed is adopted, not only the wear resistance is extremely excellent, but also the mass productivity is excellent and a low-cost vane can be provided. Such vanes are also useful for future alternative CFC refrigerants.

Further, since the sintered iron is used as the base material, all the processing can be performed only by the grinding processing, so that the number of steps and management can be greatly reduced. The conventional sintered iron simply provided with porosity had problems of strength and dimensional distortion, and mass production was difficult. However, setting the porosity to 15% or less solved these problems. In addition, by forming the Fe-N layer also in the pores, it was possible to serve as a seal and to hold the refrigerating machine oil, thereby greatly improving wear resistance.

From these facts, a very reliable rotary compressor can be realized.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a top surface and a side surface of a vane constituting a rotary compressor according to a first embodiment of the present invention.

FIG. 2 is a sectional view of the vane shown in FIG.

FIG. 3 is a cross-sectional view of the tip and side portions of the vane of FIG.

FIG. 4 is an enlarged sectional view of the vane of FIG. 1;

FIG. 5 is a cross-sectional view of a tip portion and a side portion of a vane included in a rotary compressor according to a second embodiment of the present invention.

FIG. 6 is a cross-sectional view of a side portion of a vane included in a rotary compressor according to Embodiment 3 of the present invention.

FIG. 7 is a cross-sectional view of a side portion of a vane included in a rotary compressor according to Embodiment 4 of the present invention.

FIG. 8 is a cross-sectional view of a side portion of a vane included in a rotary compressor according to Embodiment 5 of the present invention.

FIG. 9 is a longitudinal sectional view showing a schematic overall configuration of a conventional rotary compressor.

FIG. 10 is a cross-sectional view of the rotary compressor.

[Explanation of symbols]

 7 Cylinder 8 Suction hole 9 Discharge cutout 13 Roller 14 Guide groove 15 Vane 15a Tip 15b Side surface 19 Void 20 Compound layer (Fe-N layer) 21 Nitrogen diffusion layer 22 Compound layer in pore 23 Oxide film B1 base B2 base

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C21D 1/06 C21D 1/06 E 9/00 9/00 A C22C 33/02 C22C 33/02 B 37 / 06 37/06 Z 38/00 304 38/00 304 38/18 38/18 38/40 38/40

Claims (17)

[Claims] A cylinder having a refrigerant suction portion and a refrigerant discharge portion; a roller rolling along an inner peripheral surface of the cylinder; and a roller inserted into a groove formed in the cylinder in a radial direction. A rotary compressor comprising a vane sliding back and forth on an outer peripheral surface to partition the inside of the cylinder into a suction portion side and a discharge portion side, wherein the vane is 9% to 27% of Cr, C0. A quenching-hardening iron-based powder material containing 4% or more is formed and sintered to form a base material of sintered iron having a porosity of 15% or less, and the base of the base material is quenched and tempered. A rotary compressor having a structure in which a martensite structure is formed and an Fe-N layer and a nitrogen diffusion layer are formed on a surface by nitriding in order from a surface layer. 2. The iron-based powder material is SUS440A, SU
The rotary compressor according to claim 1, wherein the rotary compressor is any one of S440B, SUS440C, SKD1, and SKD11. 3. A cylinder having a suction portion and a discharge portion for a refrigerant, a roller rolling along an inner peripheral surface of the cylinder, and a roller inserted into a groove formed in the cylinder in a radial direction. A rotary compressor including a vane that slides and retracts on an outer peripheral surface to partition the inside of the cylinder into the suction portion side and the discharge portion side, wherein the vane is Cr 9% to 27%, Ni 4% ~ 8%, C
A precipitation hardening iron-based powder material containing 0.2% or less is formed and sintered to form a sintered iron having a porosity of 15% or less as a base material. A rotary compressor characterized in that a Fe-N layer and a nitrogen diffusion layer are formed on a surface in order from a surface layer by nitriding treatment. 4. The iron-based powder material is SUS630, SUS
The rotary compressor according to claim 3, wherein the rotary compressor is any one of 631. 5. The rotary compressor according to claim 1, wherein the sintered iron is formed by solid phase sintering or liquid phase sintering. 6. A side surface portion of a vane sliding in a groove of a cylinder has a nitrogen diffusion layer exposed by grinding as a main sliding surface. The rotary compressor as described in the above. 7. A side surface portion of a vane that slides in a groove of a cylinder has a nitrogen diffusion layer exposed by grinding and a Fe—N
The rotary compressor according to any one of claims 1 to 5, wherein the mixed structure with the layer is a sliding surface. 8. The method according to claim 1, wherein the side surface of the vane that slides in the groove of the cylinder has a sliding surface of an Fe—N layer exposed by grinding. The rotary compressor as described in the above. 9. The front end of a vane sliding on a roller has an F end.
The rotary compressor according to any one of claims 1 to 8, wherein the e-N layer is a sliding surface. 10. A tip of a vane sliding on a roller,
The Fe-N layer having a surface roughness Ry of 3 μm or less exposed by grinding is used as a sliding surface.
A rotary compressor according to claim 8. 11. The nitriding treatment is a gas nitriding treatment or a gas nitrocarburizing treatment.
The rotary compressor according to any one of the above. 12. The nitrogen diffusion layer has a nitriding temperature of 500.
The rotary compressor according to any one of claims 1 to 11, wherein the rotary compressor is formed to have a thickness of 0.05 mm or more at a temperature of from ℃ to 580 ° C. 13. An oxide film is formed on a surface of a sintered iron containing pores by steam treatment.
The rotary compressor according to claim 12. 14. A roller comprising: 0.5% to 1.0% of Cr;
The rotary compressor according to any one of claims 1 to 13, wherein the rotary compressor is made of a cast iron material containing 0.2% to 0.4% Mo and 0.1% to 0.4% Mo. 15. A roller comprising: 0.5% to 1.0% of Cr;
The rotary compressor according to any one of claims 1 to 13, wherein the rotary compressor is made of a cast iron material containing 0.2% to 0.4% Mo and 0.02% to 0.1% B. 16. The refrigerant according to claim 1, wherein the refrigerant is HFC, and an ester oil as refrigeration oil is added.
The rotary compressor according to claim 15. 17. The rotary compressor according to claim 1, wherein the refrigerant is R32.