JPH0318686A - Rotary compressor - Google Patents

Abstract

PURPOSE:To reduce the noise of a compressor and improve the efficiency of compression, by providing a semi-circular refrigerant passage at the perimeter of the high pressure side of a compression chamber, and letting a return refrigerant flow from the middle position of this passage, and discharging refrigerant gas from both ends of the passage. CONSTITUTION:A semi-circular refrigerant passage 16 is provided at the perimeter of the high pressure side of a compression chamber formed at a compressor portion 3. Gas which has been compressed at the compression chamber of the compressor portion 3, is discharged into a discharge muffler 8 through a discharge valve 18, and then, is led to a desuperheater 10 through a discharge passage 19 and a connection pipe 11, and cooling is done. Afterward, the gas is made to flow dividedly to both sides of the refrigerant passage 16 through an entrance 17, and heat exchange with high pressure gas within the compression chamber is done, and then, the gas is discharged into the inside space of a sealed case 2 through penetration holes 14, 15 at both ends of the passage. Thus, the occurrence of a constant wave within the sealed case is prevented, and the noise of a compressor can be reduced. Also, the efficiency of compression can be improved.

Description

Detailed Description of the Invention (a) Field of Industrial Application The present invention relates to a rotary compressor for refrigerant used in refrigerators, showcases, etc. 《Convention〉 Conventional technology Conventionally, this type of rotary compressor has a rotating compressor inside a sealed case, as disclosed in Japanese Patent Publication No. 7038/1983, for the purpose of reducing the temperature of the discharged gas. The refrigerant compressed by the compressor is once discharged outside the sealed case and cooled in a desuperheater, and then the compressor is returned to the compressor. Some types of refrigerant are introduced into the airtight case space between the refrigerant and the electric motor, and are then discharged to the external refrigerant circuit via the air gap of the electric motor and the discharge pipe. (c) Problems to be Solved by the Invention However, according to the above configuration, the discharged gas that is returned to the sealed case is returned into the case through only one return port on the side wall of the sealed case. There has been a problem in that the pressure pulsations in the return section become high, causing standing waves to be generated in the internal space of the sealed case, which increases the noise of the compressor.

In addition, such desuperheating type compressors only cool the compressed gas, and do not take any measures to prevent heat transfer between high and low pressure gas in the compression chamber during compression, which improves compression efficiency. It wasn't possible.

The present invention has been developed in view of the above, and prevents the generation of standing waves in the sealed case due to gas returned from the desuperheater, reduces compressor noise, and reduces high and low pressure gas in the compressor section. The purpose is to suppress heat transfer between the two and improve compression efficiency.

(2) Means for Solving the Problems The present invention comprises a rotary compressor section and an electric motor section for driving the rotary compressor section housed in a sealed case, and an FE.
In this system, the refrigerant is once discharged outside the sealed case and cooled, and then introduced into the sealed case again. A refrigerant passage is provided, the return refrigerant flows from an intermediate position of the passage toward both ends, and refrigerant gas is discharged from both ends of the passage into the sealed case.

(*) Function The rotary compressor of the present invention has the above-described configuration, and can divert the return gas from the desuperheater into the semicircular refrigerant passage and discharge it from both ends of the passage into the sealed case. This allows the pressure pulsating components of the gas discharged from both ends of the refrigerant passage to cancel each other out, preventing the generation of standing waves and reducing compressor noise. Because it is formed in a shape, the high pressure gas in the compression chamber can be cooled with the refrigerant cooled by the desuperheater, and the compression efficiency can be improved by suppressing heat transfer between high and low pressure gas in the compression chamber. It is something.

(f) Examples Examples of the present invention will be described below based on the drawings. 1 is a rotary compressor for refrigerant, which includes a rotary compressor section 3 and an electric motor section 4 for driving the compressor section 3 housed in a sealed case 2. The compressor section 3 includes a cylinder block 5 that is welded to the sealed case 2 and has a cylinder bore inside, an upper frame 6 that is attached to the bottom end surface of the cylinder block and closes the cylinder bore to form a compression chamber inside. Lower frame 7
, a cup-shaped discharge muffler 8 attached to the upper frame 6, a roller (not shown) that is fitted around the eccentric part of the rotating shaft 9 and rotates eccentrically within the compression chamber, and a It is composed of a vane (not shown) whose tip abuts to divide the compression chamber into a high-pressure side and a low-pressure side. Reference numeral 10 denotes a desuperheater that once leads out the refrigerant compressed in the compression chamber of the compressor section 3 to the outside of the closed case 2 through a connecting pipe 11 to cool it, and then returns it to the inside through the connecting pipe 12. 13
14. is a semicircular groove formed on the lower surface of the upper frame;
15 are the grooves 1 so that they are at positions 180@ opposite to each other.
This is a through hole formed at both ends of 3. Then, the groove 1
A refrigerant passage 16 is formed by closing the upper surface of the third cylinder block 5.

Reference numeral 17 is an inlet of return gas formed at an intermediate position of the refrigerant passage 16 and communicating with the connecting pipe 12 of the desuperheater 10. 18 is a discharge valve installed in the discharge muffler 8.

In the compressor configured in this way, the gas compressed in the compression chamber of the compressor section 3 is discharged into the discharge muffler 8 via the discharge valve 18, and is then discharged through the discharge passage 19 of the cylinder block 5 and the connecting pipe. 11 to the desuperheater 10 outside the sealed case 2, where it is cooled. Thereafter, the cooled refrigerant is returned to the sealed case 2 via the connecting pipe 12, but after being branched from the inlet 17 to both sides of the refrigerant passage 16 and exchanging heat with the high pressure gas in the compression chamber, the refrigerant is is discharged from the through holes 14 and 15 at both ends into the internal space of the sealed case 2, and then the air gap 20 of the electric motor section 4 and the discharge pipe 2.
1 to the external refrigerant circuit.

According to this configuration, the return gas from the desuperheater 10 can be separated by the refrigerant passage 16 and discharged from the two through holes 14 and 15 that are opposed to each other by 180 degrees at both ends of the passage. Since the phases of the gases discharged from .15 are the same, the pressure pulsation components of both discharged gases cancel each other out, and the generation of standing waves can be prevented. Also,
Since the refrigerant passage 16 is formed in a semicircular shape around the high pressure side of the compression chamber, the high pressure gas in the IE compression chamber can be cooled with the refrigerant cooled by the desuper heater 10, and the cylinder block 5 etc. It is possible to suppress the heat transfer between the high and low pressure gas in the compression chamber through the components of the compressor section 3, thereby approaching an isothermal compression state and improving the compression efficiency.

In this embodiment, the groove 13 is formed in the upper frame 6 to form the refrigerant passage 16, but the present invention is not limited to this, and the cylinder block 5 and the lower frame 7 are
The refrigerant passage 16 may be formed in other structural parts of the compressor section 3, such as, or may be formed in a separate pipe body or the like.

(G) Effects of the Invention As described above, according to the present invention, even in a compressor that uses a cooling method using a desuperheater, it is possible to prevent the generation of standing waves in the sealed case due to the return gas from the heater. ,
Not only can the noise of the compressor be reduced, but also heat transfer between high and low pressure gas in the compressor section can be suppressed to improve compression efficiency.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of a rotary compressor showing an embodiment of the present invention, Fig. 2 is a plan view of main parts showing the discharge gas flow of the compressor section, and Fig. 3 is a bottom view of the upper frame. . 2... Sealed case, 3... Compressor section, 4...
Electric motor group, 5... Cylinder block, 6...
Upper frame body, 7... Lower frame body, 10... Day super heater, 13... Groove, 14.15...
- Through hole, 16... Refrigerant passage, 17... Inlet.

Claims (1)

[Claims] (1) A rotary compressor unit and an electric motor unit that drives it are housed in a sealed case, and the refrigerant compressed by the compressor unit is once discharged to the outside of the sealed case to cool it, and then sealed again. A semicircular refrigerant passage is provided around the high pressure side of the compression chamber formed in the compressor section, and the return refrigerant is introduced into the case from an intermediate position toward both ends. A rotary compressor, characterized in that it is configured to flow and discharge refrigerant gas into a sealed case from both ends of the passage.