JPH03290072A - Sealed type motor-driven compressor - Google Patents

Abstract

PURPOSE:To improve assembly work performance and increase volume efficiency by inserting the communication pipe of a suction muffler shaped by the material having the low thermal conductivity in an insertion hole of a cylinder head and installing a cap having the low thermal conductivity on the periphery of a suction hole and the penetration chamber of the cylinder head. CONSTITUTION:As for a compression element 3 accommodated in a sealed container 1, a cylinder head 4 is installed on one edge side of a cylinder 6 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 the suction muffler 9 is inserted into the insertion hole 4a of the cylinder head 4. A cap 11 is arranged in a penetration chamber 4b, and the communication pipe 10 of the suction muffler 9 penetrates through the insertion hole 4a of the cylinder head 4 and the hole 11c of the cap 11, and a part of the pipe 10 is positioned in the cap 11. Accordingly, the sucked gas is introduced into the suction hole without being warmed by the cylinder head 4 made of metal, 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-conditioner refrigerators, and the like.

Conventional technology In recent years, hermetic electric compressors (hereinafter referred to as compressors) have been required to have high energy efficiency, and in general, materials with low thermal conductivity such as synthetic resin are suitable for the suction muffler used in the direct suction system. It is already known that there are.

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

6 and 6 show a conventional compressor.

6o is an airtight container, 61 is a compression element elastically supported within the airtight container 6o, and 62 is an electric element disposed above the compression element 51. Reference numeral 63 indicates a suction muffler, 54 indicates a cylinder head, 55 indicates a connecting pipe having a string-drawing part, 66 indicates a spring washer, and the suction muffler 53 is fixed by press-fitting the communicating pipe 66 into the cylinder head 54 via the spring washer 56. has been done. 6 is inserted into the suction muffler 63 with an insertion tube. 68 is a pulp plate, 69 is a suction hole provided in the pulp plate 68, and 6o is a cylinder. 61 is a lubricating oil, and 62 is an oil capillary that supplies the lubricating oil 61 into the cylinder head 64 and is press-fitted into the cylinder head 64.

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

A compression element 61 driven by an electric element 52 without a housing receives refrigerant gas from an external cooling circuit (not shown) through an insertion pipe 6 and into a suction muffler 63 . After this refrigerant gas is guided into the cylinder head 64 in seven ways through the communication pipe 66,
It is led to the cylinder 6o through the suction hole 59.

Problem to be Solved by the Invention However, in the above-mentioned oval, the cylinder head 6
The communication pipe 55i is press-fitted into the cylinder head 4, but since the communication pipe is metallic in structure, it has good heat transfer, and the refrigerant gas entering the suction pipe through this communication pipe is 71! ]!
! 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 material with low thermal conductivity such as synthetic resin for the communication tW.

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 through chamber, a discharge chamber formed adjacent to the through chamber, and a compression element formed of a material with low thermal conductivity such as synthetic resin provided in the through chamber on the side opposite to the suction hole. A cap with a hole formed therein;
a suction muffler formed of a material with low thermal conductivity, such as a synthetic resin, having a communication pipe passing through the insertion hole and the hole in the cap; The mounting legs that come into contact with each other and the screws that attach these legs to the cylinder head are attached to the bottom.

According to the above-described configuration, the present invention inserts the communication pipe of the suction muffler made of a material with low thermal conductivity such as FY or M fat into the insertion hole of the cylinder head, and connects the ζ suction hole with the cylinder head. Since a cap with low thermal conductivity is provided around the through chamber, the intake gas is guided to the intake hole without being heated by the metal 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. 4atd
4, which is an insertion hole formed on the upper surface side of the cylinder head 4.
b is a through chamber formed in the cylinder head 4. A discharge chamber 4C is formed adjacent to this through chamber 4b. 5i
The pulp plate constituting the 1:m compression element 3 has a suction hole 6a and a discharge hole (not shown) formed therein.

6 is a cylinder that constitutes the positive feedback element 3 and has a pulp grade of 6.
and cylinder head 4 are attached with screws 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). The suction muffler 9 is composed of two parts, upper and lower chambers 9a and 9b, into which the lower part of the insertion tube is inserted. 10 is a communicating pipe formed integrally with the lower part 9b of the suction muffler 9. 10& is a mounting leg formed integrally with the communication pipe 1°, and is used to fix the suction muffler 9 to the cylinder head 4. 11 is a cap,
It is arranged within the penetration chamber 4b.

The arrangement of this cap 11 is such that the wall 11 is placed on the pulp plate 6 side.
A hole 11b is formed at a position opposite to the suction hole 6a of the pulp plate 6 at the same time as a.

Additionally, a hole 11C is formed in the upper surface of the cap 11. The communication pipe 10 of the suction muffler 9 is connected to the cylinder head 4.
A portion thereof is located inside the cap 11 by passing through the insertion hole 4a and this hole 11cf. An opening 10bi is formed in the communication tube 10 located inside this cap toward the lower surface side. 1 oa (r; 1) A small hole provided in the communication pipe 10, which penetrates into the communication pipe 1o.12 is 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 lubricating oil. It is immersed in oil 12.

Further, the leg 10a is drawn on the side opposite to the wall 11a of the cap 11 and comes into contact with the opening surface of the cap 11 to define a suction chamber within the cap. Therefore, cup 11
It is desirable that the leg 10a be in airtight contact with the leg 10a.

Further, the capillary 13 is fixed with a screw via a support piece 14.

Further, an extension pipe 16 of the communication pipe 1o integrated with the lower part 9b of the suction muffler 9 extends also to the opposite side and is in contact with the wall 16 of the upper part 9a. The upper part 9 and the lower part 9b of the suction muffler 9 are engaged with each other via a partition plate 17. At this time, the partition plate 17 is fixed in an inclined state. Holes 18 for sucking refrigerant gas are formed at intervals in the extension pipe 16 facing the insertion pipe 7 in the housing. Then, a hole 20 for discharging (1 oil) v19 is provided in the partition plate 17 and the lower part 9b.
゜21 form is used.

With the above configuration, the refrigerant gas returning from the cooling device (not shown) is guided to the suction muffler 9 through the insertion pipe T, and is guided to the suction muffler 9 through the communication pipe 10. Opening 1 ob, cap 11
The suction pipe passes through the suction hole 6a and enters the cylinder e, but since the refrigerant gas flows while contacting the synthetic resin wall, it is less affected by heat from the cylinder head 4, and the refrigerant gas is less likely to be heated, so the volumetric efficiency can be improved. I can figure it out. Further, since the mounting leg 10a comes into airtight contact with the cap 11 to form a suction chamber with poor heat conduction, assembly can be easily performed. Furthermore, since the cylinder head 4 is mounted so as to be sandwiched between the legs 10a and the communication pipe 1o, the suction muffler 9 does not rotate all over, so it can be easily fixed.

Effects of Komei As mentioned above, this research is inserted into the insertion hole of the communication pipe cylinder head and fixed by sandwiching the cylinder head with the mounting legs, so when the suction muffler is fixed, the rotation is prevented, making assembly work easier. Improves sex.

In addition, since the refrigerant gas flows from the chamber with low thermal conductivity formed by the leg and the cap of the communicating tube to the suction hole, heating of the refrigerant gas is suppressed and the volumetric efficiency can be improved.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view of a compressor according to an embodiment of the present invention, FIG. 2 is a perspective view of the cap shown in FIG. 1, FIG. 3 is a perspective view of the communicating pipe shown in FIG. 1, and FIG. The drawings are a cross-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 a cross-section of main parts taken along line E--E in FIG. 1... Airtight container, 2... Electric element, 3
...Compression element, 4...Cylinder head, 4a...Insertion hole, 4b...Penetration chamber,
4C...Discharge chamber, 5a...Suction hole, 9.
...Suction muffler, 10...Communication pipe, 10a
...Mounting leg, 10b...Opening, 1
1... Cap, 11b... Hole, 11
C...hole.

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 through chamber formed in the through chamber, a discharge chamber formed adjacent to the through chamber, and a suction hole of a compression element formed of a material with low thermal conductivity such as synthetic resin provided in the through chamber and opposing a suction muffler made of a material with low thermal conductivity such as a synthetic resin having a communication pipe passing through the insertion hole and the hole in the cap; and a communication pipe of the suction muffler. A hermetic electric compressor comprising a mounting leg that is integrally formed and comes into contact with the opening surface of the cap, and a screw that attaches the leg to the cylinder head.