JP2000297772A - Rotary compressor and refrigerating cycle system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the abrasion of a crankshaft and its sliding face and improve the sealing property of a refrigerant by providing a seal cap fixed to the inside of a discharge muffler and pressed-in and coupled with the boss section outer diameter of a sub-bearing. SOLUTION: A resin seal cap 12a having elastic force with weak rigidity and caulk-connected 14 by an oil feed pipe 5 together with a discharge muffler 6a having no press-in coupling section is pressed-in and coupled with the boss section outer diameter 11a of a sub-bearing 4a. Since the seal cap 12a has weak rigidity, the press-in distortion quantity of the inner diameter 13a of the sub-bearing 4a having little nonsliding face 9 is reduced. When the press-in distortion quantity applied to the inner diameter 13a of the sub-bearing 4a having little nonsliding face 9 is reduced, the nonsliding face 9 can be reduced, and a sliding face 8 can be sufficiently secured. The abrasion of a crankshaft and its sliding face can be reduced, and the sealing property of a refrigerant can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary compressor used for a refrigerator or the like and a refrigeration cycle system using the same.

[0002]

2. Description of the Related Art A conventional rotary compressor is disclosed in
What is described in -146074 is known.

Hereinafter, a conventional rotary compressor will be described with reference to the drawings. FIG. 7 is a side sectional view of a conventional rotary compressor, and FIG. 8 is a main enlarged view thereof.
In FIG. 7, reference numeral 1 denotes a closed casing.
A compression muffler 6 integrated with an oil supply pipe 5 is press-fitted into a sub-bearing 4 of the compression element 2. The discharge muffler 6 has a disk-shaped outer shape, and one end of the oil supply pipe 5 is caulked and fixed to an opening at the center thereof. The discharge muffler 6 has a high rigidity in order to reduce the noise of the rotary compressor. Reference numeral 7 denotes a crankshaft which rotates on a sliding surface 8 of the sub bearing 4. Reference numeral 9 denotes a non-sliding surface provided on the sliding surface 8 of the sub-bearing 4 for absorbing distortion when the discharge muffler 6 is press-fitted.

[0004]

However, in the above-mentioned conventional structure, since the rigidity of the discharge muffler 6 is strong,
The press-fit distortion occurs, and the non-sliding surface 9 is provided to absorb the press-fit distortion. Therefore, the sliding surface 8 cannot be sufficiently secured, and the abrasion of the crankshaft 7 and the sliding surface 8 increases. There was a problem of applying.

In order to solve the above-mentioned problems, Japanese Patent Application Laid-Open No.
FIG. 9 shows a technique disclosed in Japanese Patent Publication No. 26079.
In FIG. 9, reference numeral 10 denotes a groove provided in the press-fitting portion of the discharge muffler 6 of the sub bearing 4b having no non-sliding surface 9. The distortion of the sliding surface 8 due to the discharge muffler 6 press-fitted into the sub bearing 4b having no non-sliding surface 9 is absorbed by the groove 10, so that the non-sliding surface 9 provided on the conventional sliding surface 8 is conventionally used. Can be eliminated, and the sliding surface 8 can be sufficiently secured.

However, there is a problem that the clearance for forming the above-mentioned groove is small and processing is difficult. Further, the sealability of the refrigerant at the press-fit portion of the discharge muffler 6 press-fitted into the sub-bearing 4b without the non-sliding surface 9 is poor, and the crankshaft 7 There is a problem that the refrigerant leaks in the direction as indicated by the arrow. Furthermore, a high-temperature compressed gas is discharged from the first discharge pipe 15 to the outside of the closed casing 1 to radiate heat once, as shown in FIG. When the pre-cooler system is used, the pre-cooler system returns from the closed casing 1.
The pressure inside will drop. Further, since the high-temperature compressed gas is directly discharged from the inside of the discharge muffler 6, the pressure inside the discharge muffler 6 increases. Accordingly, the pressure difference between the inside of the closed casing 1 and the inside of the discharge muffler 6 becomes large, and the refrigerant is likely to leak in the direction of the crankshaft 7 from the outer diameter 11b of the boss portion of the sub-bearing 4b which is the press-fit portion of the discharge muffler 6.

The present invention solves the above problems, and provides a high-quality, high-efficiency rotary compressor in which the wear of a crankshaft and its sliding surface is reduced and the sealing performance of a refrigerant is improved. Is what you do.

[0008]

According to the present invention, there is provided a seal cap having a weak rigidity, which is fixed inside a discharge muffler and is press-fitted to an outer diameter of a boss portion of a sub-bearing. Since the discharge muffler is not press-fitted as in the prior art, the press-fit distortion is reduced.

[0009]

According to the first aspect of the present invention, oil is stored in a closed casing, an electric element including a stator and a rotor, and a compression element driven by the electric element are provided. The elements are a crankshaft having an eccentric part, a cylinder forming a compression chamber concentrically with the rotation center of the crankshaft, a roller fitted in the eccentric part and rolling in the compression chamber, and the roller A vane that separates the compression chamber into a high pressure and a low pressure by being pressed against the main body and a main bearing on the electric element side and a sub-bearing on the anti-electric element side that support the shaft while sealing both side surfaces of the cylinder. A discharge valve provided on the side opposite to the cylinder surface of the sub-bearing, a discharge muffler covering the discharge valve, and one end fixed to the discharge muffler, and the other end opened into the oil. And a seal cap fixed to the inside of the discharge muffler and press-fitted to the outer diameter of the boss portion of the sub-bearing, so that the press-fit distortion is reduced and the non-sliding surface is reduced. And a sufficient sliding surface can be secured, so that the abrasion of the crankshaft and its sliding surface is reduced, and the sealing performance of the refrigerant is improved by the seal cap, so that high quality and high efficiency rotary compression can be achieved. You can get a chance.

According to a second aspect of the present invention, in the rotary compressor according to the first aspect, by using a seal cap having a low rigidity, the press-fit distortion is reduced, and the non-sliding surface is reduced. It is possible to secure a sufficient sliding surface, so that the abrasion of the crankshaft and its sliding surface is reduced, and the sealability of the refrigerant is improved by the seal cap having a low rigidity, thereby achieving high quality and high efficiency. Can be obtained.

According to a third aspect of the present invention, in the rotary compressor according to the first aspect, the seal cap is made of a resin material having elasticity, so that the press-fit distortion is reduced.
Since the non-sliding surface can be reduced and the sliding surface can be sufficiently secured, wear of the crankshaft and its sliding surface is reduced. By improving the sealing performance of the rotary compressor, a high-quality, high-efficiency rotary compressor can be obtained.

According to a fourth aspect of the present invention, in the rotary compressor according to the first aspect, by forming the seal cap from a thin metal plate, the press-fit distortion is reduced, and the non-sliding surface can be reduced. Since a sufficient sliding surface can be ensured, the wear of the crankshaft and its sliding surface is reduced, and the sealing performance of the refrigerant is improved by a thin metal plate sealing cap, so that a high-quality, high-efficiency rotary You can get a compressor.

[0013] The invention described in claim 5 is the first invention.
In the rotary compressor according to any one of 4, the seal cap is caulked together with the discharge muffler by an oil supply pipe, and when the discharge muffler is connected to the boss of the sub-bearing, the seal cap is adjusted to the outer diameter of the boss. Since the press-fitting is performed, the amount of distortion of the inner diameter of the sub-bearing can be reduced, the non-sliding surface conventionally provided on the sliding surface can be reduced, and the sliding surface can be sufficiently secured.
Reduce the wear of the crankshaft and its sliding surface,
By improving the sealing performance of the refrigerant by the seal cap, a high-quality, high-efficiency rotary compressor can be obtained.

According to a sixth aspect of the present invention, in the rotary compressor according to the fourth aspect, the seal cap is caulked and joined together with the discharge muffler by an oil supply pipe, and the caulked portion is sealed by resistance welding, so that the refrigerant can be further reduced. It is possible to obtain a high-quality, high-efficiency rotary compressor with reduced leakage loss.

[0015] Further, the invention according to claim 7 is based on claims 1 to
6. In the rotary compressor according to any one of the above, a pre-cooler system is used in which the high-temperature compressed gas is directly discharged from the discharge muffler to the outside of the closed casing, and once radiated, is returned to the inside of the closed casing. descend. Further, since the high-temperature compressed gas is directly discharged from the discharge muffler, the pressure in the discharge muffler increases. As a result, the pressure difference between the closed casing and the discharge muffler increases, and the refrigerant easily leaks from the press-fit portion of the discharge muffler. , A highly efficient rotary compressor can be obtained.

The invention according to claim 8 is an HFC refrigerant in which the sliding conditions are usually severe and the surface pressure of the sliding surface needs to be reduced, provided with the rotary compressor according to any one of claims 1 to 7. It has a refrigeration cycle system, and can be a high-efficiency, high-quality refrigeration cycle system.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment for a rotary compressor according to the present invention will be described below with reference to the drawings. The same components as those in the related art are denoted by the same reference numerals, and detailed description is omitted.

(Embodiment 1) FIG. 1 is a longitudinal sectional view of a rotary compressor showing Embodiment 1 of the present invention. FIG. 2 is an enlarged view of a main part of the rotary compressor.

1 and 2, reference numeral 1 denotes a closed casing, in which a compression element 2 and an electric element 3 are provided in the closed casing 1, and a sub-bearing on the compression element side for supporting a crankshaft 7 of the compression element 2 is provided. Non-sliding surface 9 provided on sliding surface 8 of 4a
The resin cap 12a having a low elasticity and having a low rigidity is press-fitted into the outer diameter 11a of the boss portion of the sub-bearing 4a with a small rigidity, which is crimped together with the discharge muffler 6a having no press-fitting portion by the oil supply pipe 5. Mated.

The resin seal cap 12a having a resilient force and press-fitted to the outer diameter 11a of the boss portion of the sub-bearing 4a having a small non-sliding surface 9 has a low rigidity. Since the amount of press-fit distortion of the inner diameter 13a of the sub-bearing 4a with less 9 is reduced, the sub-bearing 4a with less non-sliding surface 9 can be provided.

As described above, the rotary compressor shown in the first embodiment is provided on the sliding surface 8 by reducing the amount of press-fit distortion applied to the inner diameter 13a of the sub-bearing 4a having a small sliding surface 9. Since the non-sliding surface 9 can be reduced and the sliding surface 8 can be sufficiently ensured, wear of the crankshaft 7 and its sliding surface is reduced, and furthermore, a resin seal having elasticity. By improving the sealing performance of the refrigerant by the cap 12a, a high-quality, high-efficiency rotary compressor can be obtained.

(Embodiment 2) FIG. 3 is an enlarged view of a main part of a rotary compressor according to Embodiment 2 of the present invention. FIG. 4 is a diagram comparing the measured value of the press-fitting strain applied to the inner diameter of the sub-bearing of the rotary compressor according to each embodiment with the press-fitting strain applied to the inner diameter of the sub-bearing of the conventional rotary compressor.

In FIG. 3, the outer diameter 1 of the boss portion of the sub bearing 4a is shown.
1a is press-fitted with a seal cap 12b of a thin sheet metal pressed product having low rigidity, which is caulked and connected 14 'together with the discharge muffler 6a having no press-fitting portion by the oil supply pipe 5. The caulked joint 14 'is sealed by resistance welding.

The non-sliding surface 9 has a small amount of non-sliding surface 9 because the seal cap 12b of a thin metal pressed product press-fitted to the outer diameter 11a of the boss portion of the sub bearing 4a has a small rigidity. Since the amount of press-fit distortion of the inner diameter 13a of the sub-bearing 4a is reduced, the non-sliding surface 9 is reduced in the sub-bearing 4a.
Can be provided.

As shown in FIG. 4, the non-sliding surface 9 on the side of the compression element 2 that supports the crankshaft 7 of the rotary compressor shown in the second embodiment has a small number of non-sliding surfaces 9 outside the boss portion. The inner diameter of the sub-bearing 4a having a small non-sliding surface 9 when the seal cap 12b of a sheet metal pressed product press-fitted to the diameter 11a together with the discharge muffler 6a having no press-fitting portion by the oil supply pipe 5 is press-fitted. 13a and the distortion amount of the inner diameter 13 of the sub bearing 4 when the discharge muffler 6 (having a high rigidity) is press-fitted to the outer diameter 11 of the boss portion of the sub bearing 4 of the conventional rotary compressor. Then, the result that it was the same level was obtained.

From the above, the rotary compressor shown in the second embodiment is provided on the sliding surface 8 by reducing the amount of press-fit distortion applied to the inner diameter 13a of the sub-bearing 4a having a small non-sliding surface 9. In addition, since the non-sliding surface 9 can be reduced and the sliding surface 8 can be sufficiently ensured, the wear of the crankshaft and its sliding surface is reduced, and the refrigerant is formed by the cap 12b of a thin metal stamped product. By improving the sealing performance of the rotary compressor, a high-quality, high-efficiency rotary compressor can be obtained.

The resistance welding of the caulking connection portion 14 'further reduces the leakage loss of the refrigerant, so that a high-quality, high-efficiency rotary compressor can be obtained.

(Embodiment 3) Embodiment 3 will be described below. In FIG. 1, the rotary compressor includes a first discharge pipe 15
, A high-temperature compressed gas is discharged outside the closed casing 1 and once radiated, a pre-cooler system is returned into the closed casing 1 through the return pipe 16. In the pre-cooler method, the pressure in the closed casing 1 decreases. Further, since the high-temperature compressed gas is directly discharged from the discharge muffler 6a having no press-fitting portion, the discharge muffler 6 having no press-fitting portion is provided.
The pressure in a rises. As a result, the pressure difference between the inside of the closed casing 1 and the inside of the discharge muffler 6a having no press-fitting portion becomes large, and the refrigerant is more likely to leak from the press-fitting portion of the discharge muffler 6a having no press-fitting portion. Since the sealability of the refrigerant is improved by press-fitting the seal cap 12b of the product, a high-quality, high-efficiency rotary compressor can be obtained.

(Embodiment 4) FIG. 5 is a refrigeration cycle system diagram of a refrigeration apparatus according to Embodiment 4 of the present invention. FIG.
In this example, reference numeral 01 denotes a rotary compressor shown in Examples 1 to 4 which is connected to a condenser 03 by a discharge pipe 02 and an evaporator 0 by a suction pipe 06.
5 is connected. 04 is a capillary tube,
As shown in the figure, the well-known refrigeration cycle system is sequentially connected in a ring shape. The HFC refrigerant usually has severe sliding conditions and needs to reduce the surface pressure of the sliding surface. However, by providing the rotary compressor 01 shown in the first to third embodiments, the wear of the sliding surface can be reduced. Since the number of the refrigeration cycles is reduced and the sealing performance of the refrigerant is improved, a high-quality and high-efficiency refrigeration cycle system can be obtained.

[0030]

As described above, according to the first aspect of the present invention, oil is stored in a closed casing, and an electric element comprising a stator and a rotor and a compression element driven by the electric element are formed. The compression element is fitted to the crankshaft having an eccentric portion, a cylinder forming a compression chamber concentrically with the rotation center of the crankshaft, and rolling in the compression chamber. A roller, a vane that is pressed against the roller to partition the compression chamber into a high pressure and a low pressure, seals both side surfaces of the cylinder, and a main bearing and a counter bearing on an electric element side that supports the crankshaft. The sub-bearing on the electric element side, a discharge valve provided on the side opposite to the cylinder surface of the sub-bearing, a discharge muffler covering the discharge valve, one end is fixed to the discharge muffler, and the other end is Together with an oil supply pipe which opens into serial in oil, it said fixed inside the discharge muffler, in which provided with the sealing cap is fitted pressed into a boss outer diameter of the auxiliary bearing.

Therefore, when connecting the discharge muffler to the boss portion of the sub-bearing, the seal cap having low rigidity is press-fitted to the outer diameter of the boss portion, so that the distortion amount of the inner diameter of the sub-bearing can be reduced. Since the non-sliding surface provided on the sliding surface can be reduced, and the sliding surface can be sufficiently secured, the wear of the crankshaft and its sliding surface is reduced, and the seal cap is used for the refrigerant. By improving the sealing property, a high-quality, high-efficiency rotary compressor can be obtained.

The invention according to claim 2 is the rotary compressor according to claim 1, wherein the seal cap has a low rigidity. Therefore, when the discharge muffler is coupled to the boss portion of the sub-bearing, the seal cap having low rigidity is press-fitted to the outer diameter of the boss portion, so that the distortion amount of the inner diameter of the sub-bearing can be reduced, and the conventional sliding surface can be reduced. Since the non-sliding surface provided on the surface of the crankshaft can be reduced and the sliding surface can be sufficiently secured, the wear of the crankshaft and its sliding surface is reduced, and the refrigerant is formed by a seal cap having a low rigidity. By improving the sealing performance of the rotary compressor, a high-quality, high-efficiency rotary compressor can be obtained.

According to the third aspect of the present invention, since the seal cap is made of a resin material having elasticity, the amount of distortion of the inner diameter of the sub-bearing can be reduced, and the non-sliding surface provided on the conventional sliding surface can be reduced. Since the running surface can be reduced and the sliding surface can be sufficiently secured, the wear of the crankshaft and its sliding surface is reduced, and the sealing performance of the refrigerant is improved. An efficient rotary compressor can be obtained.

According to the fourth aspect of the present invention, since the cap is made of a thin metal plate, the amount of distortion of the inner diameter of the sub-bearing can be reduced, and the non-sliding surface provided on the conventional sliding surface can be reduced. Since it is possible to reduce the wear of the crankshaft and its sliding surface, and further improve the sealing performance of the refrigerant,
A high quality, high efficiency rotary compressor can be obtained.

According to the fifth aspect of the present invention, the cap is caulked together with the discharge muffler by an oil supply pipe, so that a high quality and high efficiency rotary compressor can be provided by improving the sealing property of the refrigerant. Can be obtained.

In the invention according to claim 6, the cap is caulked together with the discharge muffler by an oil supply pipe, and the caulked portion is sealed by resistance welding.
It is possible to reduce the leakage loss of the refrigerant and obtain a highly efficient rotary compressor.

Further, according to the present invention, the high-temperature compressed gas is directly discharged from the discharge muffler to the outside of the closed casing,
Once the heat is released, the pre-cooler method is used to return to the inside of the closed casing. Therefore, the pre-cooler method increases the pressure difference between the closed casing and the discharge muffler, and the refrigerant easily leaks from the press-fitted portion of the discharge muffler. However, since the sealing performance of the refrigerant is improved by press-fitting the seal cap, a high-quality, high-efficiency rotary compressor can be obtained.

An eighth aspect of the present invention is a refrigeration cycle system using an HFC and including the rotary compressor according to any one of the first to seventh aspects.

Therefore, even in the case of an HFC refrigerant in which the sliding conditions are usually severe and it is necessary to lower the surface pressure of the sliding surface, the provision of the rotary compressor according to any one of claims 1 to 7 makes it possible to wear the sliding surface. Therefore, a high-quality and high-efficiency refrigeration cycle system can be obtained since the sealing performance of the refrigerant is improved.

[Brief description of the drawings]

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

FIG. 2 is an enlarged sectional view of a main part of the rotary compressor showing the first embodiment.

FIG. 3 is an enlarged sectional view of a main part of a rotary compressor showing the second and third embodiments.

FIG. 4 is a characteristic diagram of the amount of press-fit distortion applied to the inner diameter of the sub-bearing of the rotary compressor showing the first to third embodiments.

FIG. 5 is a refrigeration cycle system diagram showing a fourth embodiment of the present invention.

FIG. 6 is a longitudinal sectional view of a conventional rotary compressor.

FIG. 7 is an enlarged sectional view of a main part of a conventional rotary compressor.

FIG. 8 is an enlarged sectional view of a main part of another conventional rotary compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed casing 2 Compression element 3 Electric element 4, 4a, 4b Secondary bearing 5 Oil supply pipe 6a Discharge muffler 7 Crankshaft 8 Sliding surface 9 Non-sliding surface 11a, 11b Boss outer diameter 12a, 12b Seal cap 13a Non-sliding Inner diameter of sub-bearing 4a with less surface 9 14, 14 'swaged joint 15 First discharge pipe 16 Return pipe 01 Rotary compressor 02 Discharge pipe 03 Condenser 04 Capillary tube 05 Evaporator 06 Suction pipe

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Kiyoshi Izumo 4-5-2-5 Takaida Hondori, Higashi-Osaka-shi, Osaka Matsushita Refrigerator Co., Ltd. F-term (reference) 3H029 AA04 AA15 AA21 AB03 BB16 BB31 BB42 BB44 CC17 CC19 CC25 CC28 CC38 CC39

Claims (8)

[Claims] 1. A crankshaft for storing oil in a closed casing, including an electric element including a stator and a rotor, and a compression element driven by the electric element, wherein the compression element has an eccentric portion. A cylinder that forms a compression chamber concentrically with the rotation center of the crankshaft; a roller that is fitted to the eccentric portion and that rolls in the compression chamber; A high-pressure and low-pressure vane, and sealing both sides of the cylinder, a main bearing on the electric element side and a sub-bearing on the anti-electric element side that supports the crankshaft,
A discharge valve provided on the side opposite to the cylinder surface of the sub-bearing,
The discharge muffler covering the discharge valve, one end is fixed to the discharge muffler, and the other end has an oil supply pipe opened in the oil, and is fixed inside the discharge muffler. A rotary compressor equipped with a press-fitted seal cap. 2. The rotary compressor according to claim 1, wherein the seal cap has a low rigidity. 3. The rotary compressor according to claim 1, wherein the seal cap is made of an elastic resin material. 4. The rotary compressor according to claim 1, wherein the seal cap is made of a thin metal plate. 5. The rotary compressor according to claim 1, wherein the seal cap is caulked with the discharge muffler at a fixed portion between the oil supply pipe and the discharge muffler by the oil supply pipe. 6. The rotary compressor according to claim 4, wherein the seal cap is caulked together with the discharge muffler by an oil supply pipe, and the caulked portion is sealed by resistance welding. 7. A pre-cooler system in which a high-temperature compressed gas is directly discharged from a discharge muffler to the outside of a closed casing, once radiated, and returned into the closed casing.
A rotary compressor according to any one of the above. 8. A refrigeration cycle system using an HFC refrigerant and comprising the rotary compressor according to claim 1.