JPH09222082A - Compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce incurring of the slide loss of a compressor and to improve durability of a compressor by a method wherein a slide material is made proper and an oil film is easily formed, in a compressor being used in a refrigerating device and an air-conditioner wherein the compressor uses 1, 1, 2- tetrafluoroethane as gas to be compressed. SOLUTION: In an element of which a compressor 1 consists, a plurality of oil grooves consisting of a radial groove formed in a traingular shape are attached to the upper end surface of a bearing 14 formed of an aluminum alloy, and a thrust support 15 on the surface of which nickel compound plating mixed with 10-35volume% polyvinyl tetrafluoroehtyleneparticulates is formed is attached between a rotor 3 and a bearing 14. This constitution improves the lubrication and wear characteristics of the slide surface of the thrust support and a bearing and improves the efficiency and durability of a compressor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique of a compressor used for a refrigerating machine, an air conditioner and the like.

[0002]

2. Description of the Related Art In recent years, refrigerants such as difluorodichloromethane (hereinafter referred to as CFC-12) containing chlorine in the molecule have been conventionally used in compressors of freezers and refrigerators and air conditioners due to environmental problems such as destruction of the ozone layer. , Difluorochloromethane (hereinafter, referred to as HCFC-22), etc., and refrigerant 1,2 tetrafluoroethane (hereinafter, referred to as HFC-134a) containing no chlorine in the molecule is enclosed. There is. However, since the refrigerant that does not contain chlorine in the molecule has poor lubrication performance, wear occurs in the sliding portion where wear did not occur in the case of the conventional refrigerant, wear increases, sliding loss increases, and It causes deterioration of durability. Therefore, it is necessary to improve the characteristics of the sliding material of the compressor and review the component structure.

An example of a conventional compressor will be described below with reference to the drawings. In FIGS. 13, 14 and 15, 1 is a compressor. Reference numeral 2 is a shaft, 3 is a rotor, 4 is a stator, and the rotor 3 and the stator 4 constitute a pair to constitute an electric motor. 5 is a connecting rod, 6 is a cylinder, 7 is a piston, and 8 is a piston pin. Rotor 3 and stator 4
The shaft 2 press-fitted into the rotor 3 rotates along the bearing 9 by the motor configured by. This time,
Through the connecting rod 5 attached to the eccentric portion of the shaft 2 and the piston pin 8 attached to the other end of the connecting rod 5 and fixed to the piston 7, the rotational movement of the shaft 2 is transmitted and the piston 7 is moved inside the cylinder 6. Reciprocate. Then, the refrigerant gas is sucked and compressed in the space 10 formed by the piston 7 and the cylinder 6. A thrust receiver 11 is provided between the rotor 3 and the bearing 9. The lubricating oil 12 in the lower part of the compressor is pumped up by an oil supply pipe 13 attached to the lower part of the shaft, and then further pumped up to the upper part of the compressor by a spiral oil supply groove formed in the shaft 2 Be refueled.

Here, the weight of the rotor 3 and the stator 4 is 1
200 to 1500 g, and conventionally, the rotor 3 and the bearing 9 directly slide due to the weight of the rotor 3 and the stator 4,
In order to prevent occurrence of thrust wear, for example, a hollow disk-shaped thrust receiver 11 is press-fitted into the shaft 2 between the rotor 3 and the bearing 9. The thrust receiver 11 is made of tool steel (JIS: SK5M), which is an iron-based material that is compatible with the aluminum-based alloy material that is the material of the bearing 9 in terms of wear resistance.

[0005]

However, in the above-mentioned structure, C having a high lubricating performance as the refrigerant of the compressor is used.
It is considered on the premise that FC-12 and HCFC-22 are enclosed. Generally, the contact part between the thrust receiver and the bearing is farthest from the oil supply pipe in the sliding parts of the components in the compressor, and the thrust receiver and the bearing are in surface contact sliding, so that the bearing top end Since it is difficult for the lubricating oil that has reached the sliding part to enter the sliding part, it can be said that the lubrication condition is not so good compared to the other sliding parts. In addition, dust such as minute abrasion powder generated in other sliding parts is pumped up to the upper end of the bearing together with the lubricating oil. Etc.

Here, even with the above configuration, the CFC-
The reason why wear did not occur in the compressor using 12 or HCFC-22 as a refrigerant is that CFC-12 or HCFC-22 itself, which is enclosed as a refrigerant in addition to the lubricating oil, has a high lubricating performance. .

In the case of a compressor containing a refrigerant HFC-134a containing no chlorine in the molecule and having inferior lubrication performance, sliding loss is increased particularly at the contact portion between the thrust receiver and the bearing, which are under relatively poor lubrication conditions. Therefore, the compression efficiency deteriorates. In addition, since metal contact is likely to occur, if adhesive wear occurs, sufficient durability of the compressor cannot be obtained.

Therefore, it is necessary to urgently newly optimize the sliding material for the above-mentioned chlorine-free refrigerant.

[0009] In view of the above problems, the present invention provides a refrigerant HFC-1.
The object of the present invention is to improve the durability of the compressor by reducing the sliding loss of the compressor by making the sliding material proper and making the oil film easy to form in the compressor using 34a. .

[0010]

In order to solve the above-mentioned problems, a compressor of the present invention uses a refrigerant HFC-134 as a refrigerant to compress a gas to be compressed.
a, a plurality of oil grooves consisting of radial grooves are attached to the upper end surface of the bearing, and plating between the rotor and the bearing is made by blending 10 to 35% by volume of polytetrafluoroethylene with a matrix alloy containing nickel as the main component. It is equipped with a thrust receiver on the surface. According to the present invention, the sliding loss between the rotor and the bearing, for example, the thrust receiver supporting the own weight of the rotor and the stator and the bearing is reduced, and the wear is prevented. As a result, the efficiency and the durability of the compressor are improved. it can.

In order to solve the above-mentioned problems, the compressor of the present invention uses the refrigerant HFC-134a as the gas to be compressed, installs a plurality of oil grooves consisting of radial grooves on the upper end surface of the bearing, and connects the rotor and the bearing. In the meanwhile, the gas nitriding treatment in which the water content in the ammonia gas is 3 to 10% and the steaming treatment are simultaneously applied to the surface to form a solid solution layer containing nitrogen and oxygen and an oxide film layer formed thereon. It has a receiver attached. According to the present invention, the sliding loss between the rotor and the bearing, for example, the thrust receiver supporting the own weight of the rotor and the stator and the bearing is reduced, and the wear is prevented. As a result, the efficiency and the durability of the compressor are improved. it can.

In order to solve the above-mentioned problems, the compressor of the present invention uses the refrigerant HFC-134a as the gas to be compressed, installs a plurality of oil grooves consisting of radial grooves on the upper end surface of the bearing, and connects the rotor and the bearing. In between, a salt bath nitriding treatment and a steam treatment are applied to the surface to attach a nitriding layer and a thrust receiver having an oxide film layer formed thereon. According to the present invention, the sliding loss between the rotor and the bearing, for example, the thrust receiver supporting the own weight of the rotor and the stator and the bearing is reduced, and the wear is prevented. As a result, the efficiency and the durability of the compressor are improved. it can.

In order to solve the above-mentioned problems, the compressor of the present invention uses the refrigerant HFC-134a as the gas to be compressed, installs a plurality of oil grooves consisting of radial grooves on the upper end surface of the bearing, and connects the rotor and the bearing. In between, a salt bath nitriding treatment in which a sulfur compound is added to the surface is performed, and a nitriding treatment layer and a thrust receiver having a sulfide coating layer formed thereon are attached. According to the present invention, the sliding loss between the rotor and the bearing, for example, the thrust receiver supporting the own weight of the rotor and the stator and the bearing is reduced, and the wear is prevented. As a result, the efficiency and the durability of the compressor are improved. it can.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION According to the present invention, an oil groove consisting of a radial groove is attached to the upper end surface of the bearing, and a thrust receiver subjected to a specific strengthening treatment is provided between the rotor and the bearing to reduce sliding loss of the bearing. It reduces and prevents wear, resulting in high efficiency and improved durability of the compressor.

[0015]

【Example】

(Embodiment 1) Hereinafter, Embodiment 1 of the present invention will be described with reference to the drawings.

In FIG. 1, the same components as those of the conventional example are designated by the same reference numerals as those in FIG. 13 and their detailed description is omitted. 1 is a compressor. 2 is a shaft, 3 is a rotor, 4
Is a stator, and the rotor 3 and the stator 4 together form an electric motor. Here, the rotor 3 and the bearing 14
A thrust receiver 15 is provided between them. 5 is a connecting rod, 6 is a cylinder, 7 is a piston, and 8 is a piston pin. The shaft 2 press-fitted into the rotor 3 rotates along the bearing 14 by the motor formed by the rotor 3 and the stator 4. At this time, the rotational movement of the shaft 2 is transmitted via the connecting rod 5 attached to the eccentric part of the shaft 2 and the piston pin 8 attached to the other end of the connecting rod 5 and fixed to the piston 7, and It reciprocates in the cylinder 6. Then, the refrigerant gas is sucked and compressed in the space 10 formed by the piston 7 and the cylinder 6. The lubricating oil 12 in the lower part of the compressor is pumped up by an oil supply pipe 13 attached to the lower part of the shaft, and then further pumped up to the upper part of the compressor by a spiral oil supply groove formed in the shaft 2 Be refueled.

Here, the bearing 1 of the first embodiment is shown in FIG.
4 is a top view of the upper end of 4, that is, the sliding portion with the thrust receiver 15. After the bearing 14 is machined from an aluminum alloy, as shown in FIG. 2, a plurality of oil grooves 14a formed of, for example, triangular radial grooves are formed.

Further, FIG. 3 shows the thrust receiver 1 of the first embodiment.
5 is an explanatory view of a part of the view seen from the side surface of FIG. After processing the base material 15a into tool steel (JIS: SK5M), the thrust receiver 15 is subjected to a nickel alloy plating bath in which fine particles 15b of polytetrafluoroethylene having an average particle diameter of about 1 μm and excellent in lubricity are dispersed. Aging treatment was performed at about 300 ° C. The nickel-phosphorus composite plating layer 15c has a hardness HV of 400 to 600 and a thickness of about 10 μm, and contains 20 to 25 volume% of polytetrafluoroethylene.

As a result, the lubricating oil 12
Is guided into the oil groove 14a formed by the radial groove formed in the bearing 14 by the rotation of the shaft 2, so that an oil film is more likely to be formed on the sliding surface as compared with the conventional case. By providing the oil groove 14a in the bearing 14 in this manner, sliding characteristics with respect to the surface of the thrust receiver 15 can be improved, and minute wear powder of other sliding portions can escape from the oil groove 14a. Therefore, it is possible to prevent fine abrasion powder from being caught in the sliding surface.

On the other hand, the polytetrafluoroethylene fine particles 15b dispersed on the surface of the thrust receiver 15 have a self-lubricating property, and the polytetrafluoroethylene fine particles 15b are slid along with the entire contact surface. Bearing 1 to spread to
4 and the thrust receiver 15 do not have a sufficient oil film formed on the sliding portion between the bearing 14 and the thrust receiver 1.
Adhesive wear due to metal contact on the contact surface of No. 5 can be prevented in advance.

Therefore, in order to facilitate the formation of the oil film, the oil groove 14a provided in the bearing 14 and the thrust receiver 15 having the self-lubricating nickel phosphorus composite plating formed on the surface thereof should be provided with a double anti-wear measure. Due to the synergistic effect of the above, the wear of the sliding portion of the bearing 14 and the thrust receiver 15 can be reduced even under the HFC-134a having poor lubrication performance, and as a result, the friction coefficient can be kept small.

As described above, in the first embodiment, HFC-134a is used as the gas to be compressed, and several oil grooves 14a, for example, triangular radial grooves are attached to the upper end surface of the bearing of the compressor. , The bearing 14 and the thrust bearing 15 are mounted between the rotor and the bearing by mounting a nickel-composite-plated nickel-phosphorus composite-plated thrust bearing 15 in which a matrix alloy containing nickel as a main component is mixed with 20 to 25% by volume of polytetrafluoroethylene. Abnormal wear at the contact portion of 15 can be prevented, and the durability and compression efficiency of the compressor can be improved.

According to the first embodiment, the thrust receiver 1
20 particles of polytetrafluoroethylene 15b on the surface of 5
˜25% by volume dispersed nickel-phosphorus composite plating layer 15
c was formed, but polytetrafluoroethylene fine particles 15
Even if b is dispersed in an amount of 10 to 35% by volume, the same effect can be obtained. 10% by volume of fine particles of polytetrafluoroethylene 15b
If it is less, sufficient self-lubricity cannot be obtained. On the other hand, polytetrafluoroethylene fine particles 15b are 35% by volume.
When it is more, the uniformity and surface roughness of the plated layer deteriorate.

According to the first embodiment, it is nickel phosphorus plating in which polytetrafluoroethylene is mixed, but the same effect can be obtained by nickel plating or chromium plating.

In the first embodiment, the bearing 14 is machined from an aluminum alloy and then the oil groove 14a formed of a triangular radial groove is formed, but the upper end of the bearing 14 is formed of a triangular radial groove. It may be formed by casting an aluminum alloy after forming a mold having the oil groove 14a.

In the first embodiment, a plurality of oil grooves 14a, which are radial grooves, are formed on the upper end surface of the bearing, but the same effect can be obtained by forming a plurality of spiral or spiral oil supply grooves.

According to a second aspect of the present invention, a plurality of oil grooves, which are radial grooves, are attached to the upper end surface of the bearing, and the water content of ammonia gas is 3 on the surface between the rotor and the bearing. Gas nitriding treatment of 10% to 10% and steam treatment are simultaneously performed, and a solid solution layer containing nitrogen and oxygen and a thrust receiver having an oxide film layer formed thereon are attached. It is possible to reduce sliding loss between the thrust bearing that supports the weight of the bearing and the bearing, and prevent wear, resulting in high efficiency and improved durability of the compressor.

(Second Embodiment) A second embodiment of the present invention will be described below with reference to the drawings.

In FIG. 4, the same components as those in the conventional example are designated by the same reference numerals as those in FIG. 13 and their detailed description is omitted. 1 is a compressor. 2 is a shaft, 3 is a rotor, 4
Is a stator, and the rotor 3 and the stator 4 together form an electric motor. Here, the rotor 3 and the bearing 16
A thrust receiver 17 is provided between them. 5 is a connecting rod, 6 is a cylinder, 7 is a piston, and 8 is a piston pin. The shaft 2 press-fitted into the rotor 3 rotates along the bearing 16 by the motor formed by the rotor 3 and the stator 4. At this time, the rotational movement of the shaft 2 is transmitted via the connecting rod 5 attached to the eccentric part of the shaft 2 and the piston pin 8 attached to the other end of the connecting rod 5 and fixed to the piston 7, and It reciprocates in the cylinder 6. Then, the refrigerant gas is sucked and compressed in the space 10 formed by the piston 7 and the cylinder 6. The lubricating oil 12 in the lower part of the compressor is pumped up by an oil supply pipe 13 attached to the lower part of the shaft, and then further pumped up to the upper part of the compressor by a spiral oil supply groove formed in the shaft 2 Be refueled.

Here, the bearing 1 of the second embodiment is shown in FIG.
The upper end of 6, ie, the top view of the sliding portion with the thrust receiver 17, is shown. After the bearing 16 is machined from an aluminum alloy, as shown in FIG. 5, a plurality of oil grooves 16a formed of, for example, triangular radial grooves are formed.

Further, FIG. 6 shows the thrust receiver 1 of the second embodiment.
7 is an explanatory view of a part of the view seen from the side of FIG. After processing the base metal 17a into tool steel (JIS: SK5M), the thrust receiver 17 performs the gas nitriding treatment method and the steam treatment method at the same time with the moisture content in ammonia of 5% and the treatment temperature of 500 to 520 ° C. A solid solution layer 17b containing nitrogen and oxygen having a film thickness of 20 to 30 μm or more and an oxide film layer 17c formed on the solid solution layer 17b. The oxide film layer 17c, which is the outermost layer, is porous and is mainly made of pure magnetite.

As a result, the lubricating oil 12
Is guided into the oil groove 16a formed by the radial groove formed in the bearing 16 by the rotation of the shaft 2, so that an oil film is more likely to be formed on the sliding surface as compared with the conventional case. By providing the oil groove 16a in the bearing 16 in this manner, sliding characteristics with respect to the surface of the thrust receiver 17 can be improved, and minute wear powder of other sliding portions can escape from the oil groove 16a. Therefore, it is possible to prevent fine abrasion powder from being caught in the sliding surface. Further, the iron oxide film layer (oxide film layer 17c) formed on the surface of the thrust receiver 17 is porous, and if a small amount of lubricating oil is supplied, the lubricating oil will penetrate into the oxide film layer 17c and slide. It becomes easier to form an oil film on the surface.

Here, when a sufficient oil film is not formed on the sliding surface of the bearing and the thrust receiver, the hardness of the material of the thrust receiver is HV1000 to about HV1000 if only the gas nitriding layer is formed on the surface of the thrust receiver. Since it becomes as high as 1200, the wear resistance of the thrust receiver itself is improved, but on the contrary, it is considered that the aggression against the bearing material is increased and the adhesive wear is caused. Therefore, the sufficient durability of the compressor cannot be improved only by improving the wear resistance of the thrust receiver itself.

However, the thrust receiver 17 in the present invention
The frictional coefficient of the sliding portion can be reduced by the sliding characteristics of the oxide film layer 17c formed on the surface of the. Oxide film layer 17
c has an excellent non-adhesive property with respect to the metal or alloy which is the mating material. Further, the hardness of the thrust receiver 17 itself is HV10.
Since it becomes 00 to 1200 and wear resistance is also improved,
As a result, it is possible to prevent adhesive wear due to metal contact in the sliding portion between the bearing 16 and the thrust receiver 17.

Therefore, the oil groove 16a provided in the bearing 16 for facilitating the formation of the oil film and the thrust receiver 17 having the surface subjected to the gas nitriding treatment and the steam treatment having the sliding property and the non-adhesive property are doubled. HFC-134a with inferior lubrication performance due to the synergistic effect of the wear prevention measures
Even below, the sliding loss of the sliding portion between the bearing 16 and the thrust receiver 17 can be reduced, and abnormal wear can be prevented.

As described above, in the second embodiment, HFC-134a is used as the gas to be compressed, and several oil grooves 16a, for example, triangular radial grooves, are attached to the upper end surface of the bearing of the compressor. Tool steel (JIS: SK5M) that is the base material 17a between the rotor and the bearing
The total film thickness on the surface of the film by gas nitriding and steaming is 20
~ 30 μm or more solid solution layer 1 containing nitrogen and oxygen
7b and the thrust receiver 17 having the oxide film layer 17c formed thereon can prevent abnormal wear at the contact portion between the bearing 16 and the thrust receiver 17 and improve the compression efficiency and durability of the compressor. Can be made.

In the gas nitriding treatment and the steam treatment in Example 2, the water content in the ammonia gas atmosphere was 5%, but the total film thickness is 20 to 30 even if the water content is 3 to 10%.
It is formed to have a similar effect. When the water content is less than 3% and 10% or more,
In both cases, the thickness of the solid solution layer becomes small and sufficient abrasion resistance cannot be obtained.

In Example 2, after the bearing 16 was machined from an aluminum alloy, the oil groove 16a formed of a triangular radial groove was formed. However, the oil formed of a triangular radial groove is formed at the upper end of the bearing 16. It may be formed by casting an aluminum alloy after forming a mold having the groove 16a.

In the second embodiment, a plurality of oil grooves 16a, which are radial grooves, are formed on the upper end surface of the bearing, but the same effect can be obtained by forming a plurality of spiral or spiral oil supply grooves.

According to a fourth aspect of the present invention, a plurality of oil grooves, for example, triangular radial grooves are attached to the upper end surface of the bearing, and a salt bath nitriding treatment is performed on the surface between the rotor and the bearing. It has a nitriding layer and a thrust receiver on which an oxide film layer is formed by applying steam treatment to reduce the sliding loss between the thrust receiver and the bearing that supports the weight of the rotor and stator. In addition, it is possible to prevent abrasion, and as a result, it is possible to improve the efficiency and durability of the compressor.

(Third Embodiment) A third embodiment of the present invention will be described below with reference to the drawings.

In FIG. 7, the same components as those in the conventional example are designated by the same reference numerals as those in FIG. 13 and their detailed description is omitted. 1 is a compressor. 2 is a shaft, 3 is a rotor, 4
Is a stator, and the rotor 3 and the stator 4 together form an electric motor. Here, the rotor 3 and the bearing 18
A thrust receiver 19 is provided between them. 5 is a connecting rod, 6 is a cylinder, 7 is a piston, and 8 is a piston pin. A motor formed by the rotor 3 and the stator 4 causes the shaft 2 press-fitted into the rotor 3 to rotate along the bearing 18. At this time, the rotational movement of the shaft 2 is transmitted via the connecting rod 5 attached to the eccentric part of the shaft 2 and the piston pin 8 attached to the other end of the connecting rod 5 and fixed to the piston 7, and It reciprocates in the cylinder 6. Then, the refrigerant gas is sucked and compressed in the space 10 formed by the piston 7 and the cylinder 6. The lubricating oil 12 in the lower part of the compressor is pumped up by an oil supply pipe 13 attached to the lower part of the shaft, and then further pumped up to the upper part of the compressor by a spiral oil supply groove formed in the shaft 2 Be refueled.

Here, the bearing 1 of the third embodiment is shown in FIG.
8 is a top view of the upper end of FIG. 8, that is, a sliding portion with the thrust receiver 19. After the bearing 18 is machined from an aluminum alloy, as shown in FIG. 8, a plurality of oil grooves 18a made of, for example, triangular radial grooves are formed.

Further, FIG. 9 shows the thrust receiver 1 of the third embodiment.
9 is an explanatory view of a part of the view seen from the side surface of FIG. For the thrust receiver 19, after processing the base material 19a as tool steel (JIS: SK5M), the processing temperature is 500 to 600 ° C. and the processing time is 1.
A nitriding layer 1 having a total film thickness of 20 to 30 μm or more, which is obtained by performing a salt bath nitriding method and a steam treatment method for 5 to 2 hours.
9b and an oxide film layer 19c formed thereon. The oxide film layer 19c, which is the outermost layer, is porous and is mainly made of pure magnetite.

As a result, even if the amount is small, the lubricating oil 12 is guided by the rotation of the shaft 2 into the oil groove 18a formed of the triangular radial groove formed in the bearing 18, so that the lubricating oil 12 slides as compared with the conventional case. An oil film is easily formed on the surface. Then, the oil groove 18 is formed in the bearing 18 in this manner.
By providing a, the sliding characteristics with respect to the surface of the thrust receiver 19 can be improved, and minute wear powder of other sliding portions can be released from the oil groove 18a, so that minute abrasion powder on the sliding surface can be released. It is also possible to prevent the abrasion powder from being caught. Further, the iron oxide film layer (oxide film layer 19c) formed on the surface of the thrust receiver 19 is porous, and if a small amount of lubricating oil is supplied, the lubricating oil will penetrate into the oxide film layer 19c and slide. It becomes easier to form an oil film on the surface.

Here, when a sufficient oil film is not formed on the sliding surface of the bearing and the thrust receiver, the hardness of the material of the thrust receiver is HV700 if only the salt bath nitriding layer is formed on the surface of the thrust receiver. Since it becomes as high as ~ 800, the abrasion resistance of the thrust receiver itself is improved, but on the contrary, it is considered that the aggression to the bearing material is increased and the adhesive wear is caused. Therefore, the sufficient durability of the compressor cannot be improved only by improving the wear resistance of the thrust receiver itself.

However, the thrust receiver 19 of the present invention
The frictional coefficient of the sliding portion can be reduced by the sliding characteristics of the oxide film layer 19c formed on the surface of the. Oxide film layer 19
c has an excellent non-adhesive property with respect to the metal or alloy which is the mating material. Further, the hardness of the thrust receiver 19 itself is HV70.
Since it becomes 0 to 800 and wear resistance is also improved, as a result, adhesive wear due to metal contact in the sliding portion of the bearing 18 and the thrust receiver 19 can be prevented in advance.

Therefore, the oil groove 18a provided in the bearing 18 for facilitating the formation of the oil film and the thrust receiver 19 having the surface subjected to the salt bath nitriding treatment and the steam treatment having the sliding property and the non-adhesive property are used. Due to the synergistic effect of applying heavy wear prevention measures, HFC-134a with poor lubrication performance
Even below, the sliding loss of the sliding portion between the bearing 18 and the thrust receiver 19 can be reduced, and abnormal wear can be prevented.

As described above, in the third embodiment, HFC-134a is used as the gas to be compressed, and a plurality of oil grooves 18a, each of which is formed of, for example, a triangular radial groove, is attached to the upper end surface of the bearing of the compressor. Between the rotor 3 and the bearing 18, the surface is subjected to a salt bath nitriding treatment and a steam treatment, and the nitriding layer 1 has a total film thickness of 20 to 30 μm or more.
By attaching 9b and the thrust receiver 19 having the oxide film layer 19c formed thereon, abnormal wear at the contact portion between the bearing 18 and the thrust receiver 19 can be prevented, and the compression efficiency and durability of the compressor are improved. be able to.

The hardness of the nitriding layer formed by the salt bath nitriding method in Example 3 is about 1/2 to 2/3 of the hardness of the solid solution layer formed by the gas nitriding method. The sliding characteristics of the oxide film layer 19c and the non-adhesiveness with respect to the metal or alloy as the mating material are almost the same as those of the gas nitriding method. However, the treatment time required for the salt bath nitriding treatment method is 1.5 to 2 hours, and even if the treatment time required for the subsequent steam treatment is added, it is 1/3 compared with the treatment time in the gas nitriding treatment and the steam treatment. It is the following. Therefore, since the time required for the treatment is short, the method is excellent in mass productivity.

Further, according to the third embodiment, the nitriding layer 19 is formed.
Although the film thickness of b is 20 to 30 μm or more, if it is less than 20 μm, the abrasion resistance of the thrust receiver 19 itself cannot be secured.

In the third embodiment, the bearing 18 is machined from an aluminum alloy and then the oil groove 18a formed of a triangular radial groove is formed. However, the upper end of the bearing 18 is formed of a triangular radial groove. It may be formed by casting an aluminum alloy after forming a mold having the oil groove 18a.

In the third embodiment, a plurality of oil grooves 18a, which are radial grooves, are formed on the upper end surface of the bearing 18, but the same effect can be obtained by forming a plurality of spiral or spiral oil supply grooves. To be

According to a sixth aspect of the present invention, a plurality of oil grooves consisting of radial grooves are attached to the upper end surface of the bearing, and a salt bath nitriding treatment in which a sulfur compound is added to the surface between the rotor and the bearing. And a nitriding layer and a thrust receiver having a sulfide coating layer formed thereon are attached to reduce the sliding loss of the thrust receiver supporting the own weight of the rotor and the stator and the bearing, and Wear can be prevented, and as a result, high efficiency and improved durability of the compressor can be realized.

(Embodiment 4) Hereinafter, Embodiment 4 of the present invention will be described with reference to the drawings.

In FIG. 10, the same components as those in the conventional example are designated by the same reference numerals as those in FIG. 13 and their detailed description is omitted. 1 is a compressor. 2 is a shaft, 3 is a rotor, 4
Is a stator, and the rotor 3 and the stator 4 together form an electric motor. Here, the rotor 3 and the bearing 20
A thrust receiver 21 is provided between them. 5 is a connecting rod, 6 is a cylinder, 7 is a piston, and 8 is a piston pin. A motor formed by the rotor 3 and the stator 4 causes the shaft 2 press-fitted into the rotor 3 to rotate along the bearing 20. At this time, the rotational movement of the shaft 2 is transmitted via the connecting rod 5 attached to the eccentric part of the shaft 2 and the piston pin 8 attached to the other end of the connecting rod 5 and fixed to the piston 7, and It reciprocates in the cylinder 6. Then, the refrigerant gas is sucked and compressed in the space 10 formed by the piston 7 and the cylinder 6. The lubricating oil 12 in the lower part of the compressor is pumped up by an oil supply pipe 13 attached to the lower part of the shaft, and then further pumped up to the upper part of the compressor by a spiral oil supply groove formed in the shaft 2 Be refueled.

Here, FIG. 11 shows a top view of the upper end of the bearing 20 of the fourth embodiment, that is, the sliding portion with the thrust receiver 21. After the bearing 20 is machined from an aluminum alloy, as shown in FIG. 11, a plurality of oil grooves 20a formed of, for example, triangular radial grooves are formed.

Further, FIG. 12 shows a partial explanatory view of the thrust receiver 21 of the fourth embodiment as viewed from the side. For the thrust receiver 21, the base material 21a is tool steel (JIS: SK5M)
After processing, processing temperature 570 ° C, processing time 1.5-2
A nitriding layer 2 having a total film thickness of 20 to 30 μm or more, which is obtained by performing only a salt bath nitriding method in which a sulfur compound is added for a time.
1b and a sulfide film layer 21c formed thereon.

As a result, even if the amount is small, the lubricating oil 12 is guided by the rotation of the shaft 2 into the oil groove 20a formed of the triangular radial groove formed in the bearing 20, so that it slides as compared with the conventional case. An oil film is easily formed on the surface. Then, the oil groove 20 is formed in the bearing 20 in this way.
By providing a, the sliding characteristics with respect to the surface of the thrust receiver 21 can be improved, and minute wear powder of other sliding portions can be released from the oil groove 20a, so that minute wear powder on the sliding surface can be released. It is also possible to prevent the abrasion powder from being caught.

Here, when a sufficient oil film is not formed on the sliding surface of the bearing and the thrust receiver, the hardness of the material of the thrust receiver is HV700 if only the salt bath nitriding layer is formed on the surface of the thrust receiver. Since it becomes as high as ~ 800, the abrasion resistance of the thrust receiver itself is improved, but on the contrary, it is considered that the aggression to the bearing material is increased and the adhesive wear is caused. Therefore, the sufficient durability of the compressor cannot be improved only by improving the wear resistance of the thrust receiver itself.

However, the thrust receiver 21 in the present invention
The sulfide film layer 21c formed on the surface of the
That is, in the mild wear area which is normal wear, the wear resistance is hardly exhibited, but in the non-lubrication friction area, that is, in the severe wear in which adhesion and thermal wear mainly appear,
Particularly excellent adhesion and seizure resistance.

The sulfurating treatment layer 21c by the salt bath nitriding treatment method in which the sulfur compound is added in the present invention has the oil film forming ability and the sliding property like the oxide film layer formed by the salt bath nitriding treatment and the steam treatment. However, especially in the non-lubricating friction region, the same or higher effect as the oxide film layer can be obtained with respect to the adhesion resistance and wear resistance performance. As a result, bearing 2
It is possible to prevent adhesive wear due to metal contact in the sliding portion of the thrust receiver 21 and the thrust receiver 21. Further, since only the salt bath nitriding treatment with the addition of the sulfur compound is required, the number of steps is smaller than the method of performing the salt bath nitriding treatment and the steam treatment to form the oxide film layer and the nitriding treatment layer. Therefore, the method is excellent in mass productivity.

Therefore, the oil groove 20a provided in the bearing for facilitating the formation of an oil film and the excellent adhesion resistance,
HFC with inferior lubricating performance due to the synergistic effect of double anti-wear measures of the thrust receiver 21 whose surface is subjected to salt bath nitriding treatment with addition of a sulfur compound having seizure resistance
Even under −134a, the sliding loss of the sliding portion between the bearing 20 and the thrust receiver 21 can be reduced and abnormal wear can be prevented.

As described above, in the fourth embodiment, the HFC-134a is used as the gas to be compressed, and a plurality of oil grooves 20a, for example, triangular radial grooves are attached to the upper end surface of the bearing of the compressor. Between the rotor 3 and the bearing 20, a salt bath nitriding treatment in which a sulfur compound is added to the surface is performed to form a nitriding layer 21b having a film thickness of 20 to 30 μm or more and a sulfide film layer 21c formed thereon. By installing the receiver 21, the bearing 2
It is possible to prevent abnormal wear at the contact portion between the thrust receiver 21 and the thrust receiver 21 and improve the durability of the compressor.

According to the fourth embodiment, the nitriding layer 21
Although the film thickness of b is 20 to 30 μm or more, if it is less than 20 μm, the wear resistance of the thrust receiver 21 itself cannot be secured.

In Example 4, the bearing 20 was machined from an aluminum alloy and then the oil groove 20a formed of a triangular radial groove was formed. However, the oil groove formed of a triangular radial groove is formed at the upper end of the bearing. It may be formed by casting an aluminum alloy after forming a mold capable of forming 20a.

In the fourth embodiment, a plurality of oil grooves 20a, which are radial grooves, are formed on the upper end surface of the bearing 20, but the same effect can be obtained by forming a plurality of spiral or spiral oil supply grooves. To be

[0068]

As described above, according to the present invention, a plurality of oil grooves consisting of radial grooves are attached to the upper end surface of the bearing of the compressor, and a matrix alloy containing nickel as a main component is provided between the rotor and the bearing. Due to the synergistic effect of mounting the plated thrust receiver containing 20 to 25% by volume of polytetrafluoroethylene, the refrigerant HFC
-134a lubrication, even under severe wear characteristics, lubrication of the sliding parts of the bearing and thrust receiver,
The wear characteristics can be improved, and as a result, the compression efficiency and durability of the compressor can be improved.

A plurality of oil grooves, which are radial grooves, are attached to the upper end surface of the bearing of the compressor, and a tool steel (JIS: SK5) as a base material is provided between the rotor and the bearing.
Due to the synergistic effect of mounting a solid solution layer containing nitrogen and oxygen by gas nitriding treatment and steam treatment on the surface of M) and a thrust receiver having an oxide film layer formed thereon,
Even under severe conditions of lubrication and wear characteristics using the refrigerant HFC-134a, it is possible to improve the lubrication and wear characteristics of the sliding parts of the bearing and the thrust receiver. As a result,
The compression efficiency and durability of the compressor can be improved.

Further, a plurality of oil grooves, which are radial grooves, are attached to the upper end surface of the bearing of the compressor, and a tool steel (JIS: SK5) as a base material is provided between the rotor and the bearing.
M) is subjected to a salt bath nitriding treatment and a steam treatment on the surface thereof, and a nitriding layer and a thrust receiver having an oxide film layer formed thereon are attached.
34a, the lubrication and wear characteristics of the sliding portion of the bearing and the thrust receiver can be improved even under severe conditions of lubrication and wear characteristics, and as a result, the compression efficiency and durability of the compressor can be improved. You can

A plurality of oil grooves, which are radial grooves, are attached to the upper end surface of the bearing of the compressor, and a tool steel (JIS: SK5) as a base material is provided between the rotor and the bearing.
M) is subjected to a salt bath nitriding treatment in which a sulfur compound is added, and a nitriding layer and a thrust receiver having a sulfide film layer formed thereon are attached, whereby the refrigerant H
It is possible to improve the lubrication and wear characteristics of the sliding parts of the bearing and the thrust receiver even under severe conditions of lubrication and wear characteristics using FC-134a, and as a result, improve the compression efficiency and durability of the compressor. Can be made.

[Brief description of drawings]

FIG. 1 is a sectional view of a compressor according to a first embodiment of the present invention.

[Figure 2] Top view of the bearing

FIG. 3 is a partial explanatory view of a view seen from a side surface of the thrust receiver.

FIG. 4 is a sectional view of a compressor according to a second embodiment of the present invention.

[Figure 5] Top view of the bearing

FIG. 6 is a partial explanatory view of a view seen from the side of the thrust receiver.

FIG. 7 is a sectional view of a compressor according to a third embodiment of the present invention.

FIG. 8 is a top view of the bearing section.

FIG. 9 is a partial explanatory view of a view seen from a side surface of the thrust receiver.

FIG. 10 is a sectional view of a compressor according to a fourth embodiment of the present invention.

FIG. 11 is a top view of the bearing section.

FIG. 12 is a partial explanatory view of a view seen from the side of the thrust receiver.

FIG. 13 is a sectional view of a conventional compressor.

FIG. 14 is a top view of the bearing section.

FIG. 15 is a partial explanatory view of a view seen from a side surface of the thrust receiver.

[Explanation of symbols]

 3 Rotor 4 Stator 6 Cylinder 7 Piston 9, 14, 16, 18, 20 Bearing 11, 15, 17, 19, 19, 21 Thrust receiver 14a, 16a, 18a, 20a Oil groove 15a, 17a, 19a, 21a Base material 15b Poly 4 Fine particles of ethylene fluoride 15c Nickel phosphorus composite plating layer 17b Solid solution layer 17c, 19c Oxide film layer 19b, 21b Nitriding layer 21c Sulfide film layer

Claims (7)

[Claims] 1. A compressor provided with a shaft to be connected to an electric motor composed of a rotor and a stator, and a bearing for supporting the shaft, wherein the compressed gas is refrigerant 1,1,2 tetrafluoroethane. While installing multiple oil grooves consisting of radial grooves on the end surface,
Between the rotor and the bearing, 10 to 3 polytetrafluoroethylene was added to the nickel-based matrix alloy.
A compressor characterized by being equipped with a plated thrust receiver containing 5% by volume. 2. A compressor provided with a shaft to be connected to an electric motor composed of a rotor and a stator, and a bearing for supporting the shaft, wherein the compressed gas is refrigerant 1,1,2 tetrafluoroethane, While installing multiple oil grooves consisting of radial grooves on the end surface,
Between the rotor and the bearing, the surface is simultaneously subjected to gas nitriding treatment in which the water content of ammonia gas is 3 to 10% and steam treatment to form a solid solution layer containing nitrogen and oxygen and an oxide film layer thereon. A compressor characterized by having a thrust receiver formed therein. 3. The compressor according to claim 2, wherein both the solid solution layer containing nitrogen and oxygen in the thrust receiver and the oxide film layer formed thereon have a thickness of 20 μm or more. . 4. A compressor provided with a shaft to be connected to an electric motor composed of a rotor and a stator, and a bearing for supporting the shaft, the compressed gas being refrigerant 1,1,2 tetrafluoroethane, While installing multiple oil grooves consisting of radial grooves on the end surface,
A compressor characterized in that, between a rotor and a bearing, a surface is subjected to a salt bath nitriding treatment and a steam treatment to attach a nitriding layer and a thrust receiver having an oxide film layer formed thereon. 5. The nitriding layer in the thrust receiver is 20.
The compressor according to claim 4, wherein the compressor has a thickness of not less than μm. 6. A compressor provided with a shaft to be connected to an electric motor composed of a rotor and a stator, and a bearing for supporting the shaft, wherein the compressed gas is refrigerant 1,1,2 tetrafluoroethane, While installing multiple oil grooves consisting of radial grooves on the end surface,
A compressor characterized in that a salt bath nitriding treatment in which a sulfur compound is added to the surface is performed between a rotor and a bearing, and a nitriding treatment layer and a thrust receiver having a sulfide coating layer formed thereon are attached. 7. The nitriding layer in the thrust receiver is 20.
7. The compressor according to claim 6, wherein the compressor has a thickness of not less than μm.