JPH08114190A - Hermetic compressor - Google Patents

Abstract

PURPOSE: To form an oil film between a partition vane and a piston without lowering the efficiency of a compressor by a method wherein a communication hole is formed in the lower cover on the lower end side of a cylinder and connected to a feed oil pipe, the other opening end of the feed oil pipe is opened on the intake hole side of a compression chamber partitioned by a vane. CONSTITUTION: An upper cover 20 with which the groove part 11 of a vane 12 on the upper end plate side of a cylinder 6 is cover is provided. Further, a lower cover 21 with which an end face making contact with a vane groove 11 in the vicinity of a top dead center of the vane 12 on the lower end side of the cylinder 6 is covered in provided. A communication hole 22 is formed in the lower cover 21 and connected to a feed oil pipe 23, and the other opening end of the feed oil pipe 23 is disposed in the feed oil hole 24 of a lower end plate. The feed oil hole 24 is provided with a throttle part 25 and disposed in the lower pressure chamber 17 on the intake hole side of a compression chamber partitioned by the vane 12. This constitution forms an oil film between the vane 12 and a piston 8 without lowering the efficiency of a compressor, improves wear resistance, and provides an increased life.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic compressor for compressing a refrigerant gas in a refrigeration system or an air conditioner.

[0002]

2. Description of the Related Art A conventional compressor will be described with reference to FIGS.

FIG. 5 is a vertical sectional view of the compressor, and FIG. 6 is a horizontal sectional view of the compression mechanism portion. In FIG. 5, reference numeral 1 is a closed container in which a refrigerating machine oil 2 is enclosed. 3 is an electric motor, 4
Is a compression mechanism unit, which is driven via the crankshaft 5. The compression mechanism portion 4 is rotatably arranged on the cylinder 6, a eccentric cam 7 provided on the crankshaft 5, and the eccentric cam portion 7, and eccentrically rotates while contacting the eccentric cam 7. A piston 8, an upper end plate 9 and a lower end plate 10 that close the openings at both ends of the cylinder 6, and a vane groove 11 provided in the cylinder 6 and extending in a perpendicular direction,
The vane 12 is inserted in the vane groove 11 so as to be retractable, and the tip of the vane 12 contacts the piston 8.

The refrigerating machine oil 2 is adapted to lubricate its sliding portion by an oil pump 13 (not shown) provided at the lower end of the crankshaft 5 as the crankshaft 5 rotates.

The refrigerant is introduced into the compression mechanism section 4 from the suction hole 15 of the cylinder 6 through the gas-liquid separator 14, is discharged once into the closed container 1, and is then discharged from the upper portion of the closed container 1. It is supplied from the pipe 16 to the refrigeration cycle side.

In the sliding portion of such a compression mechanism, it is the piston 8 and the vane 12 that are particularly subject to wear.

The vane 12 reciprocates with the rotation of the crankshaft 5, but the compression chamber is rubbed against the vane groove 11 by the pressure difference between the low pressure chamber 17 and the high pressure chamber 18 of the divided cylinder 6, and the vane 12 is moved. Therefore, the wear of the vane groove 11 becomes a problem.

Further, the tip of the vane 12 is strongly pressed against the outer peripheral portion of the piston 8 by the spring 19 and the pressure on the rear surface of the vane 12, so that the outer peripheral portion of the vane 12 and the tip portion of the piston 8 are worn. . This sliding portion is different from other sliding portions, for example, the sliding portion between the crankshaft 5 and the upper end plate 9 or the lower end plate 10, and refrigerating machine oil is not supplied by the oil pump 13 and is contained in the sucked refrigerant. Since it was lubricated only with the refrigerating machine oil bleeding from the end face of the piston 8 or the piston 8, a large supply amount could not be expected, and wear often occurred. In order to solve such a problem, JP-A-57-17
In 3589, an oil injector mechanism 51 as shown in FIG. 6 is proposed. The oil injector 51 is attached to the lower portion of the cylinder 6 so as to communicate with the suction hole 15, and has an oil supply pipe 52 formed of a capillary tube having one end immersed in the refrigerating machine oil 2, a valve 53 opened and closed by a pressure difference, and a coil spring. 54.

By setting the spring force of the coil spring 54 to be larger than the pressure of the closed container 1 during normal operation and smaller than the pressure inside the closed container 1 during abnormal high pressure operation, the abnormal high pressure with a large load is set. During operation, since the piston 8 and the vane 12 in the cylinder 6 are easily worn, the refrigerating machine oil 2 stored in the bottom of the closed container 1 is caused to flow into the suction hole 15 due to the pressure difference, and enters the cylinder 6 together with the refrigerant. Piston 8 and vane 1 in cylinder 6
2 to the surface to prevent abrasion.

Further, during normal operation, high temperature oil is prevented from entering the suction passage and lowering the efficiency.

[0011]

As a refrigerant for such a hermetic compressor, a conventional dichlorofluoromethane (hereinafter referred to as C
FC12) and hydrodifluoromethane (hereinafter referred to as HCFC22) are mainly used. Also,
Regarding the refrigerating machine oil 1 sealed in the closed container 1,
Naphthenic and paraffinic mineral oils that are compatible with C12 and HCFC22 have been used.

Since these refrigerants and refrigerating machine oil circulate directly in the closed container 2, it is necessary that they have abrasion resistance in the compression mechanism section.

Recently, it has been revealed that the release of the above-mentioned refrigerants into the atmosphere leads to the destruction of the ozone layer and seriously affects the human body and biological systems. Therefore, CFC12 and HCFC22
Is gradually restricted from use and it has been decided to abolish it in the future.

Under these circumstances, 1,1,1,2-tetrafluoroethane (hereinafter referred to as HFC) is used as an alternative refrigerant.
134a), pentafluoroethane (hereinafter HF)
C125), hydrofluoromethane (hereinafter H
FC32), mixed refrigerants of these, and the like have been developed.

These HFC134a, HFC125,
HFC32 refrigerant has a low ozone depletion potential, but CFC
12 and mineral oil, which is a refrigerating machine oil used in HCFC22, is hardly compatible. Therefore, HFC134a, 1
When 25, 32, or a mixed refrigerant thereof is used as a refrigerant for a refrigerant compressor, studies have been made on ester-based, ether-based, and fluorine-based oils compatible with these refrigerants as refrigerating machine oil.

However, as the refrigerant, CFC12 or H
Instead of CFC22, HFC134a, HFC125,
In the case of a refrigerant compressor using a polyalkylene glycol-based oil or a polyester-based oil that is compatible with these refrigerants as a refrigerating machine oil using HFC32, gray cast iron used as a sliding material for the above-mentioned compression mechanism unit 4, The wear resistance of special cast iron and stainless steel decreases, and there is a problem in that the refrigerant compressor cannot be operated stably for a long period of time.

This is a conventional refrigerant such as CFC12 or H.
When CFC22 is used, chlorine (C1) atom, which is one of the constituent elements, reacts with Fe atom of the metal substrate to form an iron chloride film having good wear resistance, whereas HFC134a,
One of the causes is that when HFC125, HFC32, etc. are used, a chlorine atom does not exist in these compounds, so that a lubricating film such as iron chloride is not formed and the lubricating action is reduced.

Further, the conventional mineral oil type refrigerating machine oil contains a cyclic compound and has a relatively high oil film forming ability, whereas the refrigerating machine oil compatible with HFC134a, HFC125 and HFC32 is mainly a chain compound. However, the wear resistance is also deteriorated due to the fact that an appropriate oil film thickness cannot be maintained under severe sliding conditions.

As described above, HFC134a, HFC125, which are new refrigerants replacing CFC12 and HCFC22,
In a refrigerant compressor using HFC32 and a refrigerating machine oil that is compatible with these refrigerants, severe sliding conditions occur not only when the load is high but also when the load is normal, especially wear between the vane 12 and the piston 8. Has become a major issue.

In order to solve such a problem, for example,
When the spring in JP-A-57-173589 is weakened or is removed and oil injection is performed even under normal load, high-temperature oil is injected into the suction hole to heat the suction refrigerant and reduce the efficiency of the compressor. A problem is expected.

The present invention has been invented to solve such a problem, and in particular, an oil film between the partition vane 12 and the piston 8 which has a severe sliding condition even under a normal load using an HFC type refrigerant is used as a compressor. It is an object of the present invention to provide a refrigerant compressor which is formed without lowering the efficiency of (1), has improved wear resistance, and has a long life.

[0022]

The present invention relates to a hermetic compressor in which a compression mechanism portion driven by a driving element having an electric motor is axially arranged in a hermetic container. Side cover is provided with an upper cover that covers the vane groove part on the side of the cylinder, and a lower cover that covers the end face that contacts the vane groove near the top dead center of the vane on the lower end plate side of the cylinder is provided with a communication hole in the lower cover to connect to the oil supply pipe. The other open end of the oil supply pipe is arranged in the oil supply hole of the lower end plate, and the oil supply hole is located in the low pressure chamber of the compression chamber which is provided with a throttle and is partitioned by vanes.

Secondly, an upper cover for covering the vane groove portion on the upper end plate side of the cylinder is provided, and a lower cover for covering the end surface in contact with the vane groove near the top dead center of the vane on the lower end plate side of the cylinder is provided. Is provided with a communication hole and is connected to an oil supply pipe, and the other open end of the oil supply pipe is provided in the oil supply hole of the lower end plate, and the oil supply hole is provided with a throttle portion and is located in the low pressure chamber of the compression chamber partitioned by the vane. Let Moreover, the position of the oil supply hole is adjusted so that the opening timing of the oil supply hole is ± 60 ° of the top dead center of the piston.

Thirdly, in a horizontally installed compressor, an upper cover for covering the vane groove portion on the upper end plate side of the cylinder is provided.
Further, a lower cover is provided to cover the end surface of the cylinder on the lower end plate side in the vicinity of the top dead center of the vane in contact with the vane groove, and a communication hole is provided in the lower cover to connect to the oil supply pipe. The oil supply pipe is branched and one open end of the oil supply pipe is arranged in the oil supply hole of the lower end plate, and the oil supply hole is located in the low pressure chamber of the compression chamber partitioned by the vane with the throttle portion. The other oil supply pipe is connected to an oil pump provided on the crankshaft.

[0025]

With this configuration, not only the oil pump is used to supply oil to the sliding portion during operation, but also the compressor oil that uses the HFC system as a refrigerant is the refrigerating machine oil that is eliminated by the reciprocating motion of the vanes during normal operation. The oil is supplied to the low pressure chamber through the oil supply hole and particularly forms an appropriate oil film between the piston and the vane.

The refrigerating machine oil in the oil sump portion has the refrigerant dissolved therein, and the refrigerating machine oil passing through the oil supply hole is decompressed by the throttle portion.
At this time, the refrigerant that has been melted evaporates and cools the refrigerating machine oil, so that the temperature of the refrigerating machine oil decreases, and after cooling, the refrigerant enters promptly into the compression chamber, so that the suctioned refrigerant is not heated.

By adjusting the position of the opening of the oil supply hole, the opening timing per rotation can be changed, and the amount of oil supply can be adjusted to ensure the optimum amount of lubrication. Similar effects can be obtained even in a horizontally installed compressor.

With the above structure, the reliability of the sliding portion, especially between the piston and the vane is improved without lowering the efficiency of the compressor.

[0029]

1 is a longitudinal sectional view of a first invention of a compressor according to the present invention, and FIG. 2 is a transverse sectional view thereof. FIG. 3 is a cross-sectional view of a second invention of the compressor of the present invention. FIG. 3 is a vertical sectional view of the third invention.

An electric motor 3 and a compression mechanism portion 4 driven by the electric motor 3 via a crank shaft 5 are arranged in the closed container 1, and the compression mechanism portion 4 includes a cylindrical cylinder 6 and the crank shaft 5. An eccentric cam 7, a piston 8 rotatably disposed on the eccentric cam portion 7 and eccentrically rotating while being in contact with the eccentric cam 7, and an upper end plate 9 for closing both end openings of the cylinder 6. The vane groove 11 provided in the lower end plate 10 and the cylinder 8 and extending in the diametrical direction.
And a vane 12 which is inserted in the vane groove 11 so as to be retractable and has a tip contacting the piston 8.

Refrigerating machine oil 2 is enclosed in the bottom of the closed container 1. This refrigerating machine oil is a conventional refrigerant CFC12, H
In the case of CFC22, naphthene-based or paraffin-based mineral oil or alkylbenzene-based oil has been generally used. In the case of HFC type refrigerant, ether type and ester type oils having compatibility with the refrigerant are enclosed.

The crankshaft 5 is provided with an oil pump 13 (not shown) and supplies the refrigerating machine oil 2 to the sliding portion while rotating.

An upper cover 20 is provided to cover the vane groove portion of the cylinder 6 on the upper end plate side, and a lower cover 21 is provided to cover the end surface of the cylinder 6 in contact with the vane groove near the top dead center of the vane on the lower end plate side. The cover 21 is provided with a communication hole 22 and is connected to an oil supply pipe 23, and the other opening end of the oil supply pipe 23 is arranged in an oil supply hole 24 of the lower end plate. It is arranged in the low pressure chamber 17 of the compression chamber which is partitioned.

The crankshaft 5 is driven by the electric motor 3, and the planetary motion of the piston 8 draws in a refrigerant gas such as HFC, compresses it, and then discharges it into the closed container 1. At this time, the vane 12 partitioning the compression chamber is the spring 1
9 and the vane 12 slide while being pressed against the outer periphery of the piston 8 by the pressure applied to the back of the vane 12. Lubrication of this sliding point
Mainly due to refrigerating machine oil mixed from inhaled gas. Refrigerant oil is slightly contained in the sucked refrigerant gas, but it is not sufficient, and lubricity cannot be expected only with this amount.
Especially HFC is not enough.

Refrigerating machine oil removed by the reciprocating motion of the vane 12 is supplied to the low pressure chamber 17 through the communication hole 22, the oil supply pipe 23, the oil supply hole 24, and the throttle portion 25.

Refrigerating machine oil containing this refrigerant is stored in the oil sump portion 26.
In the above, the temperature is high temperature and high pressure, but the pressure is reduced by the throttle portion 25. At this time, the refrigerant evaporates, the refrigerating machine oil is cooled by the heat of vaporization, and the refrigerating machine oil whose temperature has dropped is supplied to the low pressure chamber 17. In the case of the conventional oil injection mechanism,
Since the capillary tube is arranged in the oil sump, decompression is performed by the capillary tube immersed in the oil sump. For this reason, even if the oil inside the thin tubes is cooled, it will immediately receive heat from the surrounding oil, and almost hot oil will mix into the suction holes, causing heating of the suction gas, leading to a reduction in compressor efficiency. It was However, the configuration of the present invention prevents heat from being received from the surroundings and supplies cooled refrigerating machine oil, which does not lead to a decrease in efficiency.

The refrigerating machine oil 2 supplied into the compression chamber enters the sliding portion between the viston 8 and the partition vane 12 and forms an oil film to prevent abrasion.

The refrigerating machine oil 2 mixed in the compression chamber is discharged from the compression mechanism section 4 together with the refrigerant, is sifted off while passing through the cutout section of the electric motor 3, and most of it returns to the oil sump section 26. In this way, by suppressing the refrigerating machine oil circulating in the refrigerating cycle, it is possible to prevent the heat exchanging of the heat exchanger from being hindered by the refrigerating machine oil and improve the efficiency of the refrigerating cycle.

When the position of the oil supply hole 24 is adjusted so that the opening timing of the oil supply hole 24 is ± 60 ° of the top dead center of the piston, the amount of refrigerating machine oil supplied can be adjusted. Lubrication and improvement of compression efficiency can be realized at the same time.

In the case of a horizontally installed hermetic compressor, the oil supply pipe 23 is branched and one open end of the oil supply pipe 23 is connected to the bottom plate 1.
No. 0 oil supply hole 24, and the other oil supply pipe 23 is connected to the oil pump 13 provided on the crankshaft 5 to supply refrigerating machine oil to each sliding portion. With this configuration, even in the case of a horizontally installed hermetic compressor, refrigerating machine oil can be supplied between the vane 12 pistons 8 and reliability can be improved.

Although the case where the compressed gas is the HFC type refrigerant in which the sliding condition between the vane 12 and the piston 8 is particularly severe has been described above, the same effect can be expected when the conventional CFC 12 and HCFC 22 are used.

[0042]

As described above, according to the present invention, the hermetic container 1 is provided with the electric motor 3 and the compression mechanism portion 4 driven by the electric motor 3 through the crankshaft 5, and the compression mechanism portion 4 is provided.
A cylindrical cylinder 6, an eccentric cam 7 provided on the crankshaft 5, a piston 8 rotatably arranged on the eccentric cam portion 7, and eccentrically rotating while being in contact with the eccentric cam 7. An upper end plate 9 and a lower end plate 10 that close the openings at both ends of the cylinder 6, a vane groove 11 provided in the cylinder 6 and extending in a diametrical direction, and a tip that is inserted into and retractable from the vane groove 11 and has a tip end. It comprises a vane 12 that contacts the piston 8.

An upper cover 20 is provided to cover the vane groove portion of the cylinder 6 on the upper end plate side, and a lower cover 21 is provided to cover the end surface of the cylinder 6 on the lower end plate side in contact with the vane groove near the top dead center. 21 is provided with a communication hole 22, is connected to the oil supply pipe 23, and the other open end of the oil supply pipe 23 is provided in the oil supply hole 24 of the lower end plate, and the oil supply hole 24 is partitioned by the vane 12 by providing the throttle portion 25. Low pressure chamber 1 of compression chamber
Located at 7.

With the above construction, even when HFC is used as the refrigerant, the reciprocating motion of the vanes can ensure an appropriate amount of oil supply. Further, by providing the throttle portion 25, the refrigerating machine oil in the oil sump portion 26 can be supplied. It is cooled by evaporating the refrigerant contained in the refrigerating machine oil.

As a result, the cooled refrigerating machine oil can be supplied to the sliding portion between the vane 12 and the piston 8.

When the position of the oil supply hole 24 is adjusted so that the opening timing of the oil supply hole 24 is ± 60 ° of the top dead center of the piston, the amount of refrigerating machine oil supplied can be adjusted. .

In the case of a horizontally installed hermetic compressor, the oil supply pipe 23 is branched, the open end of one oil supply pipe 23 is disposed in the oil supply hole 24 of the lower end plate 10, and the other oil supply pipe 23 is connected to the crank. It is connected to an oil pump 13 provided on the shaft 5 to supply refrigerating machine oil to each sliding portion. With this configuration, cooled refrigeration oil can be supplied between the vane 12 and the piston 8 even in a horizontally installed hermetic compressor.

As described above, since the suction gas is not heated and the refrigerating machine oil circulating in the refrigeration cycle can be suppressed to a small amount, it is possible to realize a highly efficient device.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a hermetic compressor of the present invention.

FIG. 2 is a cross-sectional view of the hermetic compressor of the present invention.

FIG. 3 is a transverse sectional view of the hermetic compressor of the present invention.

FIG. 4 is a vertical sectional view of the hermetic compressor of the present invention.

FIG. 5 is a vertical sectional view of a hermetic compressor of a conventional example.

FIG. 6 is a cross-sectional view of a hermetic compressor of a conventional example.

FIG. 7 is a vertical sectional view of a hermetic compressor of a conventional example.

[Explanation of symbols]

 1 Airtight container 2 Refrigerator oil 3 Electric motor 4 Compression mechanism part 5 Crankshaft 6 Cylinder 7 Eccentric cam 8 Piston 9 Upper end plate 10 Lower end plate 11 Vane groove 12 Vane 13 Oil pump 14 Gas-liquid separator 15 Suction hole 16 Discharge pipe 17 Low pressure chamber 18 High-pressure chamber 19 Spring 20 Upper cover 21 Lower cover 22 Communication hole 23 Oil supply pipe 24 Oil supply hole 25 Throttling portion 26 Oil sump portion 51 Oil injector 52 Oil supply pipe 53 Valve 54 Coil spring

Claims (6)

[Claims] 1. An electric motor and a compression mechanism portion driven by the electric motor via a crankshaft are arranged in a closed container, and the compression mechanism portion includes a cylindrical cylinder and an eccentric cam provided on the crankshaft. A piston rotatably arranged on the eccentric cam portion and eccentrically rotating while contacting the eccentric cam, an upper end plate and a lower end plate closing both end openings of the cylinder, and a diametrical direction provided on the cylinder. A vane groove that extends, and a vane that is inserted into and retractable from the vane groove and has a tip that contacts the piston,
Further, an upper cover is provided to cover the vane groove portion on the upper end plate side of the cylinder, and a lower cover is provided to cover the end face of the cylinder that contacts the vane groove near the top dead center of the lower end plate side of the cylinder. A hermetic compressor, which is provided, is connected to an oil supply pipe, and opens on the suction hole side of a compression chamber partitioned by a vane through the other opening end of the oil supply pipe through a throttle portion. 2. An electric motor and a compression mechanism portion driven by the electric motor via a crankshaft are arranged in a closed container, the compression mechanism portion includes a cylindrical cylinder and an eccentric cam provided on the crankshaft. A piston that is rotatably disposed on the eccentric cam portion and that rotates eccentrically while being in contact with the eccentric cam, an upper end plate and a lower end plate that close both end openings of the cylinder, and a diametrical direction provided on the cylinder. It is composed of a vane groove that emerges, and a vane that is inserted in the vane groove so as to be retractable and has a tip contacting the piston. Further, an upper cover is provided to cover the vane groove portion on the upper end plate side of the cylinder, and a lower cover is provided to cover the end face of the cylinder that contacts the vane groove near the top dead center of the lower end plate side of the cylinder. Provided and connected to the oil supply pipe, and the other opening end of the oil supply pipe is arranged in the oil supply hole of the lower end plate, and the oil supply hole passes through the throttle portion and the opening end of the oil supply hole is set to ± of the top dead center of the piston. A hermetic compressor characterized by being arranged at a position that opens at 60 °. 3. An electric motor and a compression mechanism portion are arranged in a closed container so that a drive crankshaft is horizontal, and the compression mechanism portion is
A cylinder having a cylindrical shape, an eccentric cam provided on the crankshaft, a piston rotatably arranged on the eccentric cam portion, which eccentrically rotates while contacting the eccentric cam, and both end openings of the cylinder are closed. The upper end plate and the lower end plate, and a vane groove provided in the cylinder extending in the diametrical direction, and a vane that is inserted into and retractable from the vane groove and has a tip contacting the piston. further,
An upper cover is provided to cover the vane groove portion on the upper end plate side of the cylinder, and a lower cover is provided to cover the end surface in contact with the vane groove near the vane top dead center on the lower end plate side of the cylinder, and a communication hole is provided in the lower cover, Connect to the oil supply pipe. The oil supply pipe is branched, one open end of the oil supply pipe is arranged in the oil supply hole of the lower end plate, and the oil supply hole is provided on the suction hole side of the compression chamber partitioned by the vane and the other oil supply pipe is provided. A hermetic compressor characterized in that a pipe is connected near the end of the crankshaft. 4. HFC (hydrofluorocarbon) containing no chlorine atom is used alone or as a refrigerant, and the refrigerating machine oil is filled with a refrigerating machine oil compatible with the refrigerant in a hermetically sealed container for refrigeration / air conditioning. In a hermetic compressor that constitutes a system, an electric motor and a compression mechanism section driven by the electric motor via a crankshaft are arranged in a hermetic container, and the compression mechanism section is provided in a cylindrical cylinder and the crankshaft. An eccentric cam, a piston rotatably disposed on the eccentric cam portion, which eccentrically rotates while contacting the eccentric cam, an upper end plate and a lower end plate closing both end openings of the cylinder, and the cylinder. And a vane groove extending in the diametrical direction, and the vane groove is inserted into the vane groove so that the vane groove can retract.
It comprises a vane whose tip contacts the piston. Further, an upper cover is provided to cover the vane groove portion on the upper end plate side of the cylinder, and a lower cover is provided to cover the end face of the cylinder that contacts the vane groove near the top dead center of the lower end plate side of the cylinder. A hermetic compressor, wherein the hermetic compressor is provided and connected to an oil supply pipe, and the other open end of the oil supply pipe is opened to a suction hole side of a compression chamber partitioned by a vane through a throttle portion. 5. HFC (hydrofluorocarbon) containing no chlorine atom is used alone or as a refrigerant, and the refrigerating machine oil is filled with a refrigerating machine oil compatible with the refrigerant in a hermetically sealed container for refrigeration / air conditioning. In a hermetic compressor that constitutes a system, an electric motor and a compression mechanism section driven by the electric motor via a crankshaft are arranged in a hermetic container, and the compression mechanism section is provided in a cylindrical cylinder and the crankshaft. An eccentric cam, a piston rotatably disposed on the eccentric cam portion, which eccentrically rotates while contacting the eccentric cam, an upper end plate and a lower end plate closing both end openings of the cylinder, and the cylinder. And a vane groove extending in the diametrical direction, and the vane groove is inserted into the vane groove so that the vane groove can retract.
It comprises a vane whose tip contacts the piston. Further, an upper cover is provided to cover the vane groove portion on the upper end plate side of the cylinder, and a lower cover is provided to cover the end face of the cylinder that contacts the vane groove near the top dead center of the lower end plate side of the cylinder. Provided and connected to the oil supply pipe, and the other opening end of the oil supply pipe is arranged in the oil supply hole of the lower end plate, and the oil supply hole passes through the throttle portion and the opening end of the oil supply hole is set to ± of the top dead center of the piston. A hermetic compressor characterized by being arranged at a position that opens at 60 °. 6. HFC (hydrofluorocarbon) containing no chlorine atom is used alone or as a refrigerant, and the refrigerating machine oil is filled with a refrigerating machine oil compatible with the refrigerant in a hermetically sealed container for refrigeration / air conditioning. In a hermetic compressor that constitutes a system, an electric motor and a compression mechanism unit are arranged in a hermetic container so that a drive shaft is horizontal, and the compression mechanism unit is provided on a cylindrical cylinder and the crankshaft. An eccentric cam, a piston rotatably arranged on the eccentric cam portion, which eccentrically rotates while contacting the eccentric cam, an upper end plate and a lower end plate closing both end openings of the cylinder, and a diameter provided in the cylinder. The vane groove extends in the direction, and the vane is inserted into the vane groove so as to be retractable and has a tip contacting the piston. Further, an upper cover is provided to cover the vane groove portion on the upper end plate side of the cylinder, and a lower cover is provided to cover the end face of the cylinder that contacts the vane groove near the top dead center of the lower end plate side of the cylinder. Provided and connected to the oil supply pipe. The oil supply pipe is branched so that the open end of one of the oil supply pipes is arranged in the oil supply hole of the lower end plate, the oil supply hole is provided with a throttle portion, and is located on the suction hole side of the compression chamber partitioned by the vane, and the other oil supply pipe is provided. Is connected near the end of the crankshaft. A horizontally installed hermetic compressor.