JPH03290073A - Sealed type motor-driven compressor - Google Patents

Abstract

PURPOSE:To reduce the coolant staying in a suction chamber and prevent the heating of coolant gas by inserting the communication pipe of a suction muffler formed by the material having a low thermal conductivity into an insertion hole on a cylinder head and forming an opened port opposed to the suction hole. CONSTITUTION:As for a compression element 3 accommodated in a sealed container 1, a cylinder 6 is installed on a cylinder head 4 through a valve plate 5 by a screw N. In this case, an insertion pipe 7 is inserted into a suction muffler 9 made of synthetic resin, and a communication pipe 10 which is integrally molded with the lower part 9b of a suction muffler 9 is allowed to penetrate through the insertion hole 4a of the cylinder head 4, and a part of the pipe 10 is positioned in a suction chamber 4b. The communication pipe 10 is formed into cylindrical form, and the undersurface is formed into an arcuate form so as to contact the undersurface of the suction chamber 4b, and an opened port 10b is formed upwardly from the lower edge at the position faced to the suction hole 5a of the valve plate 5. Accordingly, the thermal influence supplied from the cylinder head 4 is suppressed, and the heating of the coolant gas is prevented, and the volume efficiency is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a hermetic electric compressor used in refrigerators, near conditioners, and the like.

Conventional technology In recent years, hermetic electric compressors (hereinafter referred to as compressors) are required to have high energy efficiency, and the suction mufflers used in direct suction systems are generally made of synthetic resin or other materials with low thermal conductivity. is already known.

An example of the conventional compressor mentioned above (Japanese Unexamined Patent Publication No. 160570/1982) will be described below with reference to the drawings.

5 and 6 show a conventional compressor.

50 is an airtight container, 61 is a compression element elastically supported within the airtight container 50, and 52 is an electric element disposed above the compression element 51. Reference numeral 53 denotes a suction muffler, 54 a cylinder head, 55 a communication pipe having a string-drawing part, and 56 a spring washer.The suction muffler 63 is fixed by press-fitting the communication pipe 56 into the cylinder head 54 via the spring washer 56. ing. 57 is an insertion tube inserted into the suction muffler 53. 58 is a valve plate, 59 is a suction hole provided in the pulp plate 58, and 6o is a cylinder. 61 is lubricating oil 61 to the inside of the cylinder head 54, 62 is lubricating oil 61 to the inside of the cylinder head 54
is press-fitted into the cylinder head 64 with an oil capillary that supplies the oil.

The operation of the compressor configured as above will be explained below.

First, refrigerant gas is sucked into the compression element 61 driven by the electric element 52 from an external cooling circuit (not shown) into the suction muffler 63 through the insertion pipe 5 . After this refrigerant gas is guided into the cylinder head 54 through the communication pipe 55,
It passes through the suction hole 69 and is guided to the cylinder 60.

Problems to be Solved by the Invention However, in the above configuration, the cylinder head 5
A communication pipe 55 is press-fitted into the cylinder head 4, and since the communication pipe has a metallic structure, heat transfer is good, and the refrigerant gas sucked in through this communication pipe is heated by the high-temperature cylinder head and expands. It was difficult to improve the volumetric efficiency.

In view of the above problems, the present invention provides a compressor that improves workability and uses a communication pipe made of a material with low thermal conductivity such as synthetic resin.

Means for Solving the Problems In order to solve the above problems, the compressor of the present invention has the following features:
A compression element and an electric element that are elastically supported are disposed in a closed container, a metal cylinder head having an insertion hole on the upper surface attached to the compression element, and a cylinder head formed in communication with the insertion hole. A suction chamber formed adjacent to the suction chamber, a discharge chamber formed adjacent to the suction chamber, and a communication pipe that passes through the insertion hole and is partially located within the suction chamber. It is composed of a suction muffler formed therein, and an opening formed at a position facing a suction hole that guides refrigerant gas to the compression element of the communication pipe.

According to the above-described structure, the present invention inserts the communication pipe of the suction muffler made of a material with low thermal conductivity such as synthetic resin into the insertion hole of the cylinder head, and also inserts the opening facing the suction hole. Because of this, less refrigerant remains in the suction chamber, and the refrigerant gas flowing into the suction hole is guided to the suction hole where it is not heated by the cylinder head.

Embodiment The compressor according to one embodiment of the present invention is shown in Figs. 1 to 4 below.
This will be explained with reference to the figures. In the figure, 1 is a closed container, 2 is an electric element, 3 is a compression element, and 4 is a metal cylinder head that constitutes a part of the compression element 3. 4a is an insertion hole formed on the upper surface side of the cylinder head 4. 4b
is a suction chamber formed in the cylinder head 4. A discharge chamber 4C is formed adjacent to this suction chamber 4b. Reference numeral 5 denotes a pulp plate constituting the compression element 3, in which suction holes 6a and discharge holes (not shown) are formed.

6 is a cylinder constituting the compression element 3 and a pulp plate 6
Then, remove the cylinder head 4 with screw N. 7
is an insertion tube attached via a suction tube and a spring 8. 9 is a suction muffler made of synthetic resin (for example, polybutylene terephthalate). Suction muffler 9 is upper and lower 2
It is composed of two parts, chambers 9a and 9b, into which the insertion tube 7 is inserted. 10 is a communicating pipe formed integrally with the lower part 9b of the suction muffler 9. 10a is the communication pipe 10
The mounting unit formed integrally with the cylinder head 4 is a leg.
This is to fix the suction muffler 9 to. The communication pipe 10 of the suction muffler 9 passes through the insertion hole 4a of the cylinder head 4 and is partially located within the suction chamber 4b. This communication pipe 10 has a cylindrical shape, and its lower surface has an arcuate shape so as to come into contact with the lower surface of the suction chamber 4b, and an opening 10b is formed upward from the lower end at a position facing the suction hole 5a. .

10C is a small hole provided in the communication pipe 10, which penetrates into the communication pipe 1°. 12 is a lubricating oil; 13 is an oil capillary; one end of the oil capillary is inserted into the small hole 10C, and the other end is immersed in the lubricating oil 12.

In the above configuration, the refrigerant gas returned from the cooling device (not shown) is guided to the suction muffler 9 through the insertion pipe 7, and is then introduced into the communication pipe 10. The refrigerant gas is sucked into the cylinder 6 through the opening 1ob and the suction hole 5a, but the refrigerant gas flows while contacting the synthetic resin wall, and also flows through the opening 10b and into the suction hole 5a.
Since the refrigerant gas is discharged to the side, it is less affected by heat from the cylinder head 4, and since the refrigerant gas is less likely to be heated, the volumetric efficiency can be improved. Unfortunately, since the cylinder head 4 is mounted between the legs 10a and the communication pipe 10, the suction muffler 9 does not rotate and can be easily fixed.

Effects of the Invention As described above, in the present invention, the communication pipe is inserted into the insertion hole of the cylinder head, and the cylinder head is fixed between the legs for installation, which prevents rotation when the suction muffler is fixed. Improves assembly workability.

In addition, the communication pipe for the refrigerant gas is molded from a material with low thermal conductivity such as synthetic resin, and is discharged from the communication pipe to the large suction side, which reduces heating of the refrigerant gas and improves volumetric efficiency. It is something.

[Brief explanation of the drawing]

Figure 1 is a partial sectional view of a compressor according to an embodiment of the present invention, Figure 2 is a front view of the suction chamber in Figure 1, and Figure 3 is a
Fig. 4 is a sectional view of the electric compressor shown in Fig. 1, Fig. 5 is a front view of main parts of a conventional compressor, and Fig. 6 is taken along line E-E in Fig. 6. It is a sectional view of the main part that can be pressed. 1... Airtight container, 2... Electric element, 3
...Compression element, 4...Cylinder head, 4a...Insertion hole, 4b...Suction chamber,
4C...Discharge chamber, 5a...Suction hole, 9
...Suction muffler, 10...Communication pipe, 1
0a... Installation is on the legs, 1ob... Opening.

Claims (1)

[Claims] (1) A metal cylinder head with an elastically supported compression element and an electric element arranged in a closed container, an insertion hole provided in the upper surface attached to the compression element, and a cylinder head communicating with the insertion hole. A suction chamber formed in the suction chamber, a discharge chamber formed adjacent to the suction chamber, and a communication pipe that passes through the insertion hole and is partially located within the suction chamber. A suction muffler formed by
A hermetic electric compressor comprising an opening formed at a position facing a suction hole that guides refrigerant gas to the compression element of the communication pipe.