JPH0114438B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a rotary compressor used in a refrigeration cycle, etc., and particularly relates to a rotary compressor that supplies condensed liquid refrigerant into a high-pressure chamber to cool gas being compressed. .

Conventional configuration and its problems A conventional configuration will be explained with reference to FIG.

1 is a sealed casing, 2 is an electric motor section, and at the bottom thereof are a cylinder 3, a roller 4, a main bearing 5,
A mechanical part main body 8 composed of an auxiliary bearing 6, a gate valve 7, and a gate valve spring 7' is fixed.
Inside the cylinder 3, a compression chamber 9 is formed by a main bearing 5 and a sub-bearing 6. The main bearing 5 and the sub-bearing 6 rotatably support a shaft 10 connected to the electric motor section 2. This shaft 10 is provided with an eccentric cam 11 located within the compression chamber 9, and a ring-shaped roller 4 is mounted on the eccentric cam 11. A holder 15 that airtightly holds the capillary tube 12 and fixes a protective tube 14 containing the capillary tube 12 and communicating with the liquid refrigerant supply pipe 13 is press-fitted into the cylinder 3 . The capillary tube 12 has one end communicating with the compression chamber 9 via the refrigerant supply hole 16 and an opening 12' opening in the protection tube 14 outside the hermetic casing 1 at the other end.

In such a configuration, the return gas from the evaporator C flows into the compression chamber 9 through the suction pipe 17, and as the electric motor section 2 rotates, the shaft 10 and the eccentric cam 1
1, the roller 4 rotates within the compression chamber 9 to compress the refrigerant, and the compressed refrigerant is once discharged into the sealed casing 1 from the discharge hole 15 via the discharge valve 15a, and then into the discharge pipe. It is discharged from 18 to condenser A, and reaches evaporator C via main capillary tube B. On the other hand, a part of the refrigerant liquefied by the condenser A is transferred from the liquid refrigerant supply pipe 13 to the protection pipe 1.
4. The refrigerant flows into the compression chamber 9 through the capillary tube 12 and the refrigerant supply hole 16, and cools the mechanical part main body 8.

However, in this conventional example, as the refrigerant flows intermittently through the capillary tube 12 during each compression stroke, the refrigerant within the refrigerant supply pipe 13 generates pulsations, and there is no mechanism to attenuate the pulsations. There were problems such as large vibrations in the refrigerant supply pipe 13, pipe breakage, and large noise.

Purpose of the Invention The present invention uses a gas damper effect to attenuate the pulsation of refrigerant in a refrigerant supply pipe caused by the refrigerant flowing intermittently in a capillary tube every rotation of a rotary compressor. The purpose is to reduce pulsation in the supply pipe and reduce noise.

Structure of the Invention In order to achieve this object, a gas damper pipe is provided, one end of which is fixed to the cylinder for heat exchange, the other end of which communicates with the refrigerant supply pipe, and which branches off the sealing pipe, and one end of which communicates with the compression chamber. The capillary tube is configured so that the other end is opened in the sealed tube, and the pulsation of the refrigerant supply tube caused by the intermittent flow of refrigerant in the capillary tube is absorbed by the refrigerant near the compression chamber in the gas damper tube. It is designed to attenuate by the gas damper effect caused by gasification by receiving heat from the cylinder.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. Incidentally, parts that are the same as those in the conventional example are given the same reference numerals, and explanations thereof will be omitted. 19 is the refrigerant supply hole 16 of the cylinder 3
This holder is press-fitted into the refrigerant supply section 16a having a holder, and the length of contact with the cylinder is longer than that of conventional holders. A gas damper pipe 20 is fixed to this holder 19, and the gas damper pipe 20 branches off from a sealed pipe 21 near the sealed casing 1.
It communicates with the refrigerant supply pipe 13. Further, the capillary tube 12 is airtightly fixed to the holder 19, communicates with the compression chamber 9 through the refrigerant supply hole 16, and has the other end opened with a sealing tube 21.

In this configuration, the liquefied refrigerant reaches the gas damper pipe 20 from the refrigerant supply pipe 13, but at this time, the gas damper section 21' near the holder 19 in the gas damper pipe 20 receives heat from the cylinder 3 and becomes high temperature. , a part of the liquid refrigerant is gasified, and as a result, this gas damper section 20' acts as a cushion for the liquefied refrigerant, and the sealing tube 2 is closed every rotation of the compressor.
The liquefied refrigerant flowing through the opening 12' of the capillary tube 12 in the refrigerant tube 12 is once subjected to the gas damper effect of the gas damper section 20', so that pressure pulsations in the refrigerant supply pipe 13 are attenuated. here,
When the amount of gas refrigerant in the gas damper section 20' increases,
The liquid refrigerant is mixed with the inflowing liquid refrigerant through the refrigerant supply pipe 13 and the gas damper pipe 20, reaches the sealing pipe 21, and reaches the compression chamber 9 through the opening 12' of the capillary tube 12. Therefore, more than a predetermined amount of gas does not accumulate in the gas damper portion 20', and the opening 1
2' will not be occluded. Further, the gas damper effect can be obtained as long as a predetermined amount of gas accumulates in the gas damper portion 20'.

Therefore, with a simple structure, pressure pulsations in the refrigerant supply pipe 20 can be attenuated, vibration noise can be reduced, and breakage of the pipe can be prevented.

In addition, in the illustrated example, the refrigerant supply pipe 20
and the capillary tube 12 are fixed to the cylinder 3 via the holder 19, but the present invention is not limited to this.
A press-fitting bore may be formed in and fixed.

Effects of the Invention As is clear from the above description, the present invention provides a gas damper pipe that has one end fixed to the cylinder for heat exchange, and the other end communicates with the refrigerant supply pipe outside the sealed casing and branches the sealed pipe. Since the capillary tube has one end communicating with the compression chamber and the other end leading from the gas damper pipe to the sealed pipe and opens within the sealed pipe, the pressure pulsations of the liquefied refrigerant flowing from the refrigerant supply pipe are prevented. Since the gas refrigerant generated in the refrigerant supply pipe near the compression chamber is sucked into the sealed pipe which is subjected to a cushioning action, vibration and noise of the refrigerant supply pipe can be reduced, and breakage of the pipe can be prevented.

[Brief explanation of drawings]

Figure 1 is a sectional view of a conventional rotary compressor;
The figure is a sectional view of a rotary compressor showing an embodiment of the present invention. 1... Sealed casing, 3... Cylinder, 4...
... Piston, 9 ... Compression chamber, 16 ... Refrigerant supply hole, 16a ... Refrigerant supply section, 12 ... Capillary tube, 20 ... Gas damper pipe, 21 ... Sealing tube.

Claims (1)

[Claims] 1. A refrigerant supply section that houses a compression chamber constituted by a cylinder, a piston, and a bearing in a sealed casing, and is equipped with a refrigerant supply hole that opens into the compression chamber;
One end is fixed to the refrigerant supply section for heat exchange, and the other end communicates with the refrigerant supply pipe outside the sealed casing, and one end is in airtight communication with the refrigerant supply hole and a gas damper pipe that branches the sealed pipe. and a capillary tube whose other end extends from inside the gas damper pipe to the sealed pipe and opens inside the sealed pipe.