JPH07133780A - Internal high pressure type compressor - Google Patents

Abstract

PURPOSE:To provide a compressor in which R22 is used as the refrigerant, a desuperheater of large capacity is used, liquefaction of compressed gas can be restrained even if the using condition (refrigerating load, ambient temperature) is variously changed, and lubricity of sliding parts is favorably maintained so as to be excellent in durability. CONSTITUTION:In an internal high pressure type compressor constituted so that a motor element 2 and a compression element 3 are received in a closed vessel 1, high pressure gas compressed in the cylinder 7 of the compression element 3 is, after being introduced to a desuperheater 19 outside the closed vessel 1 and cooled, introduced again in the closed vessel 1, and refrigerant R22 is enclosed in the closed vessel 1, a cylinder 7 is provided with a passage circulating a cylindrical compression chamber 20, and return gas from the desuperheater 19 is introduced into this passage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal high pressure type compressor used in refrigerators, air conditioners and the like.

[0002]

2. Description of the Related Art Generally, a compressor for a refrigerator or an air conditioner has the following structure.

That is, an electric element is housed on the upper side and a rotary compression element driven by the electric element is housed on the lower side in a closed container. The electric element is composed of a stator having windings and a rotor provided inside the stator. The rotary compression element is a cylinder, a roller which is rotated along the inner wall of the cylinder by the eccentric part of the rotary shaft, and is pressed against the peripheral surface of the roller to divide the compression chamber in the cylinder into a suction side and a discharge side. And a vane that is pressed by a spring,
It is composed of an upper bearing and a lower bearing that seal the opening of the cylinder and also support the rotating shaft.

The high-pressure gas compressed in the cylinder of the rotary compression element is led to a dissuperheater outside the hermetic container, cooled, and then introduced into the hermetic container again (for example, JP-A-58-98690
(See the official gazette).

Further, the R502 refrigerant is enclosed in the closed container.

[0006]

However, the above configuration uses R502 including R12, which is a regulated refrigerant that is considered to have an adverse effect on ozone layer destruction and global warming. Therefore, for example, an alternative refrigerant is used. If R22 (HCFC22), which is considered to be less affected by ozone depletion, is used, the internal temperature of the compressor rises significantly due to the difference in the evaporation temperature point, which lowers the performance and reliability of the compressor. There's a problem.

Further, as the capacity of the compressor increases, the amount of heat generated increases, so that a larger capacity dissuper heater is required. However, the dissuper heater is compressed depending on the use conditions (refrigeration load, ambient temperature). There is a problem in that the temperature of the gas becomes too low and liquefies, and a large amount of liquid refrigerant mixes in the lubricating oil, which impairs the lubricity of the sliding portion and reduces the durability.

Further, as described above, since the capacity of the dissuper heater has to be selected depending on the usage conditions, there is a problem that the selection is difficult.

The present invention solves the above problems,
Even if R22 (HCFC22), which is considered to be less affected by ozone depletion, is used as an alternative refrigerant, the internal temperature of the compressor does not rise so much and the performance and reliability of the compressor are not degraded. The first purpose is to provide a machine.

Further, even if a large-capacity dissuper heater is used or the usage conditions (refrigeration load, ambient temperature) change, the liquefaction of the compressed gas can be suppressed, and the lubricity of the sliding portion can be kept good. A second object is to provide a compressor having excellent durability.

A third object of the present invention is to provide a compressor which can easily select a dissuper heater.

[0012]

According to the present invention, an electric element and a compression element are housed in a closed container, and high-pressure gas compressed in a cylinder of the compression element is led to a dissuperheater outside the closed container. In the internal high-pressure compressor in which the R22 refrigerant is sealed in the closed container, the cylinder is provided with a passage that circulates a cylindrical compression chamber. The return gas from the dissuper heater is introduced into the passage.

[0013]

The present invention is constructed as described above,
The compressed gas once cooled by the dissuper heater can be directly passed through the passage of the cylinder having a particularly high temperature, and the compression element can be efficiently cooled to effectively cool the temperature of the compressor. Therefore, even if R22 (HCFC22), which is considered to be less affected by ozone destruction, is used as an alternative refrigerant, the internal temperature of the compressor does not rise so much and the performance and reliability of the compressor are degraded. Can provide no compressor.

The compressed gas that has been liquefied by the dissuper heater due to changes in operating conditions and the like passes around the passage of the cylinder having a particularly high temperature, so that it is gasified again and discharged into the closed container. Therefore, even if a large capacity dissuper heater is used and the usage conditions (refrigeration load, ambient temperature) change, the liquefaction of compressed gas can be suppressed, and the lubricity of the sliding part is kept good and the durability is improved. It is possible to provide an excellent compressor and to easily select a dissuper heater.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in the drawings.

A is an internal high-pressure rotary compressor,
1 is an airtight container in which an electric element 2 is arranged on the upper side,
The rotary compression element 3 driven by this electric element on the lower side
Are stored respectively. The electric element 2 is composed of a stator 5 having a winding 4 insulated with an organic material, and a rotor 6 provided inside the stator. Rotary compression element 3
Is a cylinder 7, a roller 10 that is rotated along the inner wall of the cylinder 7 by the eccentric portion 9 of the rotary shaft 8, and is pressed against the peripheral surface of this roller to divide the inside of the cylinder 7 into a suction side and a discharge side. Vane pressed by spring (not shown)
And an upper bearing 11 and a lower bearing 12 that seal the opening of the cylinder 7 and that pivotally support the rotary shaft 8.

The upper bearing 11 is provided with a discharge hole 13 communicating with the discharge side of the cylinder 7. Further, a discharge valve 14 that opens and closes the discharge hole 13 and a discharge muffler 15 that covers the discharge valve are attached to the upper bearing 11.

The cylinder 7 is a casting, and the rollers 10 and the vanes are made of an iron material.

A refrigerant R22 (HCFC2
2) is enclosed.

The oil stored in the closed container 1 lubricates the sliding surface between the vane and the roller 10 which is the sliding member of the rotary compression element 3.

Reference numeral 16 denotes a suction pipe attached to the closed container 1 to guide the refrigerant to the suction passage 17 of the cylinder 7, and 18 denotes a discharge pipe attached to the upper wall of the closed container 1.

Reference numeral 19 denotes a dissuper heater for discharging the high-pressure gas compressed in the cylinder 7 of the compression element 3 to the outside of the closed container 1 for cooling. The high-pressure gas that has been cooled by the dissuper heater is introduced into the closed container 1 again. Here, a passage 21 that circulates in the vicinity of the cylindrical compression chamber 20 is formed in the cylinder 7. The return refrigerant from the dissuperheater 19 is introduced into this passage 21. After that, it is discharged into the internal space of the closed container 1 through the discharge port 22 of the cylinder 7 which is the end of the passage 21, and is discharged from the discharge pipe 18 to the external refrigerant circuit outside the machine through the air gap of the electric element 2. It

In the rotary compressor A thus constructed, the refrigerant R22 flowing from the suction pipe 16 into the suction side of the cylinder 7 is compressed by the cooperation of the roller 10 and the vane.
The discharge valve 14 is opened through the discharge hole 13 to discharge the muffler 1.
5 is discharged. The refrigerant in the discharge muffler is once drawn out to the dissuper heater 19 outside the machine and cooled, and then discharged from the discharge port 22 into the closed container 1 through the passage 21 of the cylinder 7 to pass through the air gap of the electric element 2. It is discharged from the discharge pipe 18 to the outside of the closed container 1 via the discharge pipe 18. Then, the oil is supplied to the sliding surface of the sliding member such as the roller 10 and the vane of the rotary compression element 3 for lubrication, and the refrigerant compressed in the cylinder 7 is prevented from leaking to the low pressure side. .

Therefore, the compressed gas once cooled by the dissuperheater 19 can be directly passed through the passage 21 of the cylinder 7, which has a particularly high temperature, so that the compression element 3 can be efficiently cooled to control the temperature of the compressor A. Can be cooled effectively. Therefore,
Even if R22 (HCFC22), which is considered to be less affected by ozone depletion as an alternative refrigerant, is used, a compressor that does not cause a rise in the internal temperature of the compressor A and does not deteriorate performance and reliability Can be provided.

Since the compressed gas circulates and passes through the passage 21 of the cylinder 7 having a particularly high temperature, it is gasified again and is discharged into the closed container 1. Therefore, even if a large-capacity dissuperheater 19 is used or the usage conditions (refrigeration load, ambient temperature) change, the liquefaction of the compressed gas can be suppressed, and the lubricity of the sliding part is kept good and the durability is improved. Compressor A with excellent properties can be provided and dissuper heater 1
It is possible to facilitate the selection and size reduction of item 9.

[0026]

As described above, according to the present invention, the compressed gas once cooled by the dissuperheater can be directly passed through the passage of the cylinder having a particularly high temperature, thereby efficiently cooling the compression element. The temperature of the compressor can be cooled effectively. Therefore, even if R22 (HCFC22), which is considered to be less affected by ozone destruction, is used as an alternative refrigerant, the internal temperature of the compressor does not rise so much and the performance and reliability of the compressor are degraded. Can provide no compressor. As a result, the clearance of each part can be reduced and the above-mentioned performance improvement can be promoted.

The compressed gas that has been liquefied by the dissuperheater due to changes in operating conditions and the like passes around the passage of the cylinder having a particularly high temperature, so it is gasified again and led out into the closed container. Therefore, even if a large capacity dissuper heater is used and the usage conditions (refrigeration load, ambient temperature) change, the liquefaction of compressed gas can be suppressed, and the lubricity of the sliding part is kept good and the durability is improved. In addition to providing an excellent compressor, it is possible to facilitate the selection and size reduction of the dissuper heater.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a rotary compressor showing an embodiment of the present invention.

FIG. 2 is a plan view of a rotary compressor showing an embodiment of the present invention. .

[Explanation of symbols]

 A rotary compressor 1 closed container 3 rotary compression element 7 cylinder 19 dissuper heater 20 compression chamber 21 passage 22 discharge hoat

Claims (1)

[Claims] 1. An electric element and a compression element are housed in a closed container, and high-pressure gas compressed in a cylinder of the compression element is led to a dissuperheater outside the closed container for cooling and then closed again. Equipped with a configuration to be introduced into the container,
In the internal high-pressure compressor in which the R22 refrigerant is sealed in the hermetic container, the cylinder is provided with a passage that circulates a cylindrical compression chamber, and the return gas from the dissuperheater is introduced into the passage. Internal high pressure type compressor.