JPH11303782A - Rotary compressor and its cooling system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce an oil content taken to the outside a closed vessel, and prevent decrease of the oil content inside the closed vessel in a rotary compressor which uses coolant mainly composed of HFC, and oil mainly composed of mineral oil or alkylbenzene. SOLUTION: This type of rotary compressor has a discharge pipe 19 arranged on the side of a cylinder 5 compared to a main side housing 6 of a closed vessel 1, and a bypass 21 having one end opened into a discharge cover 20 and the other end opened to the main side housing 6 on the side of a motor M. The opening on the side of the motor M is opened to a rotor 2. It is thus possible to separate oil from the discharged gas without deteriorating life which may be caused by local temperature rise of motor windings, and reduce oil content taken to the outside of the closed vessel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary compressor (hereinafter referred to as "compressor") used in refrigerators and the like, and to a high reliability cooling system using the same.

[0002]

2. Description of the Related Art A conventional compressor is disclosed in Japanese Unexamined Patent Publication No. Hei 3-25899.
No. 1 is known.

FIG. 3 shows CFC or H such as R12 and R22.
This shows the structure of a conventional compressor that uses a refrigerant mainly composed of CFC and uses naphthenic mineral oil as oil.
Reference numeral 1 denotes a substantially cylindrical hermetic container which is long in the lateral direction and houses a motor M including a rotor 2 having a balancer weight M1 and an end weight M2 and a stator 3, and a compression element C driven by the motor M. I have. Reference numeral 4 denotes oil, which accumulates below the closed container 1. 5 is a cylinder,
6 is a main side housing, 7 is a sub side housing,
The compression chamber 8 is formed in close contact with both sides of the cylinder 5.
Reference numeral 9 denotes a shaft coupled to the rotor 2 and has an eccentric portion 10. 11 is a roller fitted to the eccentric part 10,
It is inscribed in the compression chamber 8. Reference numeral 12 denotes a vane which partitions the compression chamber 8 into high and low pressures. Reference numeral 13 denotes a discharge valve provided in the sub-side housing. Reference numeral 14 denotes a discharge cover having a discharge hole 15 and a curved oil pipe 16 in the center. One end of the oil pipe 16 penetrates into the oil 4 and has a coil spring fixed to the shaft 9 therein. 17 are provided.

In the above configuration, the unbalance component generated from the eccentric portion 10 of the shaft 9 and the roller 11 is rotationally balanced by the balancer weight M1 and the end weight M2 provided on the rotor 2. The rotation of the rotor 2 is transmitted to the shaft 9, and the coil spring 17 fixed to the shaft 9 is controlled by the oil pipe 16 and rotates while maintaining a curved shape. Are sequentially supplied to the shaft 9. At the same time, the gas sucked from the suction pipe 18 is compressed in the compression chamber 8 and is discharged from the discharge valve 13 provided in the sub-side housing 7 to the discharge cover 14.
After being discharged into the inside of the closed container 1 through the discharge hole 15, the liquid is discharged out of the closed container 1 through the discharge pipe 19.

[0005]

However, in the above conventional structure, a large amount of oil contained in the discharge gas is taken out of the closed container together with the discharge gas, and the refrigerant mainly composed of HFC and the mineral oil or alkylbenzene are removed. When the main oil is used, the compatibility between the refrigerant and the oil is poor, so that the return of the oil from the cooling system becomes poor, and the amount of oil in the closed container is reduced.
There has been a problem that the amount of oil supplied to the shaft 9 by the lead of the coil spring 17 passing through the inside is reduced, leading to a decrease in reliability.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a compressor which reduces the amount of oil taken out of a closed container and hardly causes a decrease in the amount of oil in the closed container. .

Another object of the present invention is to provide a system in which oil is returned more reliably in addition to the above objects.

[0008]

In order to solve the above-mentioned problems, according to the present invention, a discharge pipe is mounted on a closed container at a position opposite to the motor when viewed from the main side housing, and one end or the discharge cover is provided. And the other end is provided with a bypass that opens to the motor side of the main side housing, and the opening direction toward the motor side opens toward the rotor.

As a result, oil contained in the discharged gas is separated without causing a local temperature rise of the motor winding,
The amount of oil taken out of the closed container can be reduced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first aspect of the present invention, a discharge pipe is attached to a position of a hermetically sealed container on a side opposite to a motor when viewed from a main side housing, and one end of the discharge tube is opened in a discharge cover. The other end is provided with a bypass opened to the motor side of the main side housing, and the opening direction to the motor side is open toward the rotor, and once the discharge gas is discharged from the main side housing. After discharging to the motor side, it is discharged to the outside of the closed container from the discharge pipe provided on the cylinder side from the main side housing of the closed container, so the oil contained in the discharge gas is separated and the amount of oil taken out of the closed container is reduced In addition, since the high-temperature discharge gas is not directly applied to the motor winding, a local temperature rise of the motor winding can be suppressed.

According to a second aspect of the present invention, the opening of the bypass of the first aspect toward the motor is open toward the axial center.
This makes it difficult for the discharge gas to directly hit the balancer weight of the rotor, thereby suppressing noise.

According to a third aspect of the present invention, the compressor according to the first or second aspect is used,
A cooling system in which an evaporator is disposed above the compressor, the discharge gas is discharged from the main side housing to the motor side, and the closed vessel is discharged from a discharge pipe provided on the cylinder side from the main side housing of the closed vessel. Because it discharges outside,
The oil contained in the discharge gas is separated, so that the amount of oil taken out of the closed container is reduced, and the oil from the cooling system is easily returned.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The same parts as those of the conventional example are denoted by the same reference numerals, and detailed description will be omitted.

(Embodiment 1) FIG. 1 shows the first and second embodiments.
According to one embodiment of the present invention, R134 used in refrigerators and the like, and HFC-based refrigerants such as R410A, R407C and R404A used in vending machines, air conditioners and the like, and oils are used. FIG. 1 is a side sectional view of a compressor using an oil having poor compatibility with an HFC-based refrigerant such as a naphthenic mineral oil or an alkylbenzene-based synthetic oil.
Is a sealed container, 2 is a rotor having a balancer weight M1 and an end weight M2, 5 is a cylinder, 6 is a main side housing, 7 is a sub side housing, 8 is a compression chamber, 1
3 is a discharge valve, 19 is a discharge pipe provided on the cylinder side of the closed container 1 partitioned by the main side housing 6, 2.
0 is a discharge cover, 21 is a bypass, one end is opened in the discharge cover 20, the other end is opened on the motor M side of the main side housing 6, and the opening direction on the motor side is in the axial direction. It opens toward the rotor 2.

In the above-described configuration, the high-temperature discharge gas compressed in the compression chamber 8 is discharged from the discharge valve 13 into the discharge cover 20 and passes through the bypass 21 to be partitioned by the main side housing 6. The fluid is discharged toward the rotor 2 in the axial direction toward the motor M in 1. Once the motor M
The discharge gas released toward the rotor 2 in the axial direction toward the rotor 2 in the side space passes through the space between the motor M and the main side housing 6 after passing through the space between the motor M and the main side housing 6. Through the main side housing 6
Is released into the space on the side of the cylinder 5 in the closed container 1 partitioned by the above, and is discharged out of the closed container 1 through a discharge pipe 19 provided in the closed container 1. In the meantime, the gas flow velocity is reduced, the discharge gas is blown against the rotor 2, and the mist-like oil contained in the discharge gas is agglomerated by passing through the gaps of the motor M, the main side housing 6, and the cylinder 5. It is dropped and separated. At this time, since the opening direction of the bypass 21 toward the motor is opened toward the rotor 2, the high-temperature discharge gas discharged to the motor M through the bypass 21 flows to the winding M3 of the motor M. Direct contact does not occur, and a local temperature rise of the winding M3 of the motor M can be suppressed. Further, since the opening direction of the bypass 21 toward the motor is opened toward the rotor 2 in the axial direction, the discharged gas is less likely to directly hit the balancer weight M1 rotating with the rotor 2 at a high speed, so that the rotating gas rotates at a high speed. The wind noise generated when the discharge gas is directly applied to the balancer weight can also be suppressed.

(Embodiment 2) FIG. 2 shows an R134 used in a refrigerator or the like according to an embodiment of the present invention.
a, R410 to be used in vending machines, air conditioners, etc.
A, R407C, R404A and other refrigerants using HFC-based refrigerants, and using a compressor using oil with poor compatibility with HFC-based refrigerants such as naphthenic mineral oil or alkylbenzene-based synthetic oil as oil. 1 is a schematic diagram of a system, in which 22 is a compressor described in Example 1, 23 is a condenser, 2
4 is a dryer, 25 is a capillary, 26 is an evaporator, and the evaporator 26 is provided above the compressor 22.

In the above configuration, gas sucked from the suction pipe 18 is compressed by the compressor 22 and discharged from the discharge pipe 19. The discharged gas is condensed and liquefied in the condenser 23, passes through the drier 24, is further decompressed in the capillary 25, is evaporated and vaporized in the evaporator 26, and the evaporator 26 is cooled. It is compressed by suction. Oil is contained in the discharge gas discharged from the compressor 22 and passes through the same cycle as the discharge gas. The oil viscosity increases in the evaporator where the temperature drops the most in the middle. In addition to the action of the first embodiment, the oil returns to the compressor 22 in addition to the action of the first embodiment because a force due to its own weight is applied in addition to the flow of the gas.

[0018]

As is apparent from the above embodiment, according to the first aspect of the present invention, the discharge pipe provided on the cylinder side from the main side housing of the closed container, one end is opened in the discharge cover, and The other end is provided with a bypass that opens to the motor side of the main side housing, and since the opening direction to the motor side opens toward the rotor, without reducing the life of the motor winding, The effect of reducing the amount of oil taken out of the closed container and preventing a decrease in the amount of oil in the closed container is obtained.

According to the second aspect of the present invention, since the opening of the bypass of the first aspect toward the motor side is open toward the axis, the noise of the first aspect is added to the effect of the first aspect. Is obtained.

According to the third aspect of the present invention, the rotary compressor according to the first or second aspect is used as the compressor, and the evaporator is disposed above the compressor. The effect of reducing the amount of oil taken out of the closed container, improving the return of oil from the cooling system to the compressor, and preventing the decrease in the amount of oil in the closed container is obtained.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a rotary compressor according to a first embodiment of the present invention described in claims 1 and 2;

FIG. 2 is a schematic diagram of a cooling system according to a second embodiment of the present invention described in claim 3;

FIG. 3 is a side sectional view of a conventional rotary compressor.

DESCRIPTION OF SYMBOLS 1 Closed container 2 Rotor 3 Stator M Motor M1 Balancer weight M3 Winding of motor M 4 Oil 5 Cylinder 6 Main side housing 7 Secondary side housing 13 Discharge valve 18 Suction pipe 19 Discharge pipe 20 Discharge cover 21 Bypass 22 Compressor 23 Condenser 24 Dryer 25 Capillary 26 Evaporator

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Hiroyuki Komori 4-5-2-5 Takaida Hondori, Higashi-Osaka City, Osaka Inside Matsushita Refrigerator Co., Ltd.

Claims (3)

[Claims] 1. A motor which uses a refrigerant mainly composed of HFC, and is composed of an oil mainly composed of mineral oil or alkylbenzene, a compression element, a stator for driving the compression element, and a rotor having a balancer weight in a closed container. A cylinder constituting the compression element, a main side housing on the motor side for sealing both end faces of the cylinder and forming a compression chamber, a sub-side housing on the opposite side to the motor, and a bias in the cylinder. A core-rotating roller, a vane whose leading end presses against the roller to partition the compression chamber, a discharge valve disposed on the side of the sub-side housing opposite the cylinder, and the sub-side covering the discharge valve. A discharge cover fixed to the housing, the closed container being located at a position opposite to the motor when viewed from the main side housing. Attached to the discharge pipe, one end is opened in the discharge cover, the other end is provided with a bypass opened to the motor side of the main side housing, and the opening direction on the motor side faces the rotor. An open rotary compressor. 2. The rotary compressor according to claim 1, wherein the opening of the bypass toward the motor is open toward the axial center. 3. At least a compressor, a condenser, a dryer, a capillary, and an evaporator, wherein the compressor includes the rotary compressor according to claim 1 or 2, and the evaporator. A cooling system, wherein the compressor is located above the compressor.