JPH03258978A - Sealed type compressor - Google Patents

Abstract

PURPOSE:To moderate the heating of a coolant gas in an inlet passage by providing heat insulating layer between two partitioning plates forming the inlet passage and two partitioning outer walls. CONSTITUTION:An inlet passage 32 is formed of two partitioning plates 33, 33a. On the outside of the partitioning plates 33, 33a, partitioning outer walls 35, 35a are provided to form heat insulating layers 36, 36a, and a heat insulating material by foamed body and the like is charged between them. Hence, the heating of a coolant gas passing the inlet passage 32 by the influence of the heat transmitted from an inlet muffler 25 outer wall can be reduced. Thus, a sufficient heat insulating effect of the coolant gas can be attained.

Description

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

Conventional technology In recent years, hermetic compressors (hereinafter referred to as compressors) are required to be small, highly energy efficient, and low cost.
A method has been proposed to improve the specific volume of suction gas by placing the suction muffler close to the suction hole of the compression element (
For example, JP-A-62-147058, JP-A-63
-29079 Publication). An example of a conventional compressor will be described below with reference to the drawings.

1 and 4 are longitudinal sectional views of a conventional compressor described in Japanese Patent Application Laid-Open No. 147058/1983. In FIG. 4, reference numeral 1 denotes a closed container in which an electric element 2 and a compression element 3 are elastically supported. Reference numeral 3a denotes a space inside the closed container, and 4 a suction muffler.A suction pipe 5 constituting one end of the suction muffler 4 is located close to and opposite to the suction hole 7 of the pulp plate 6. Reference numeral 8 denotes a suction portion that introduces suction gas (not shown) into the suction muffler 4 via a suction tube (not shown) attached to the closed container 1. 9 is a muffler space inside the suction muffler 4;
Reference numeral 10 denotes a suction passage, which is composed of a cylindrical pipe.

The operation of the compressor constructed as described above will be explained with reference to FIG. When the compressor starts operating, gas discharged from the compressor is guided from the refrigeration cycle (not shown) to the suction section 8 of the suction muffler 4 through a suction tube (not shown). Gas entering the suction muffler 4 from the suction portion 8 is released into the muffler space. The gas released into the muffler space 9 is guided through the suction passage 10 and the suction pipe 5 through the suction hole 5 of the valve plate 6 to the compression element during operation of the compressor.

Next, FIG. 5 is a sectional view of a main part showing a part of a suction muffler of a second example of the conventional compressor described in Japanese Patent Application Laid-Open No. 53-29079. Reference numeral 11 denotes a suction muffler, and a connecting portion 13 constituting one end of the suction muffler 11 is connected to a gas introduction hole 16 of a cylinder head 14 . 16 is a rail-shaped protrusion, 17
is a partition wall that separates the open space 18 and the suction space 19. A gas passage 2o is located near the center of the partition wall 17, and constitutes a gas passage connecting the open space 18 and the suction space 19.

The operation of the second example of the conventional compressor constructed as described above will be explained with reference to the sectional view of the main parts in FIG. When the compressor starts operating, gas is sucked into the open space 18 through the suction section 12 of the suction muffler 11. Then, it passes through the rail-shaped projection 16, is guided from the gas passage 20 to the suction space 19, and is passed from the connection part 13 of the suction muffler 11 through the gas introduction hole 15 of the cylinder head 14 to the compression element (
(not shown). At this time, since the open space 18 and the suction space 19 are divided by the partition wall 17, the gas passes through the gas path 20.

Problems to be Solved by the Invention However, in the configurations shown in FIG. 4 (described in JP-A-62-147058) and FIG. 5 (described in JP-A-63-29079), the suction passage, the open space, and the suction space are The outer wall of the suction muffler constitutes the outer wall of the suction muffler and is in direct contact with the space inside the sealed container (the space outside the suction muffler), so the heat transferred from the outside of the suction muffler is transferred to the suction passage, open space,
In the closed space, the refrigerant gas in the suction section is heated, and sufficient insulation effect cannot be obtained.For compressors with small cylinder volume, the efficiency decreases significantly due to the reduction in the insulation effect of refrigerant gas. I had the problem of doing so.

In view of the above problems, the present invention provides an inexpensive and easy-to-manufacture compressor with high efficiency even in a compressor with a small cylinder volume by obtaining a sufficient heat insulation effect of refrigerant gas. .

Means for Solving the Problems In order to solve the above problems, the compressor of the present invention has a suction muffler made of a heat insulating material such as plastic, and one end of the suction muffler is connected to a certain suction muffler. The pipe is configured to communicate with or be close to the suction hole of the valve plate, and the connecting pipe portion forming the other end of the suction muffler is connected to or be close to the suction tube installed in the sealed container, and the suction muffler , at least two partition plates having one end forming a small suction space connected to the connecting pipe portion and the other end forming a suction passage opening in the vicinity of the suction pipe, and forming the suction passage. Two partition outer walls are provided on the side opposite to the suction passage of the two partition plates, and a heat insulating layer is formed between the two partition plates and the two partition outer walls. It is prepared. Furthermore, the compressor described above has a structure in which a heat insulating layer made of two partition plates and two outer walls of the partition constituting the suction passage is filled with a heat insulating material such as a foam.

According to the above-described configuration, the present invention has a heat insulating layer composed of two partition plates and two partition outer walls, and a heat insulating material filled in the heat insulating layer, so that the refrigerant gas passing through the suction passage is directed to the suction muffler outer wall. Since heating due to the influence of heat transferred from the suction passage is significantly reduced, a sufficient heat insulation effect of the refrigerant gas passing through the suction passage can be obtained.

EXAMPLE Hereinafter, a compressor according to an example of the present invention will be described with reference to the drawings.

FIG. 1 is a cross-sectional view of a compressor in an embodiment of the present invention;
2 is a longitudinal cross-sectional view of the suction muffler shown in FIG. 1, taken along the line AA, and FIG. 3 is a cross-sectional view of a compressor according to another embodiment of the present invention. In FIGS. 1 to 3, 21 is a compressor, 22 is a closed container, and an electric element 23 and a compression element 24 are elastically supported. The compression element 24 is a piston 24a,
It has a cylinder 24b. 25 is a suction muffler, and a suction pipe 26 constituting one end of the suction muffler 25 is connected to a suction hole 28 of a valve plate 27 in a cylinder head suction portion 28a.
communicated through. A connecting portion 29 connects the other end of the suction muffler 25 to the suction tube 30 via a spring 29a. The suction tube 30 is attached to pass through the closed container 22. On the other hand, inside the suction muffler 25, reference numeral 31 denotes a small suction space, which constitutes a connecting portion 29 and is connected to a spring 29a and a suction passage 32. The suction passage 32 has two partition plates 33.3.
3a, and one end forms a suction port 34 in the center of the suction pipe 26. There is a partition outer wall 35.35a on the outside of the partition plate 33.33a, and the partition plate 33,3
3a and the partition outer wall 35.35a form a heat insulating layer 36.36a.

37.37a is a heat insulation layer opening. 38 is a muffler wall surface, and 39 is a muffler space.

The operation of the compressor configured as described above will be described below with reference to FIGS. 1 and 2.

When the compressor 21 starts operating, the gas discharged from the compressor 21 passes from the refrigeration cycle (not shown) to the suction muffler 2 through the suction tube 3o and the spring 29a.
You will be guided to the small suction space of 5.

The gas introduced into the small suction space 31 is continuously suctioned by the reciprocating movement of the piston 24a, passes through the suction passage 32, and flows from the suction port 34 to the suction pipe 26°, the cylinder head suction section 28a, and the pulp plate. 27 into the cylinder 24b.

The temperature of the refrigerant gas just before it is sucked into the cylinder 24b (
The specific volume (specific volume) greatly influences the efficiency of the compressor, and it is desirable that the temperature is as low as possible. However, when passing through the suction muffler 25, the refrigerant gas is easily heated because the wall surface of the suction muffler is at a very high temperature (approximately 110°C).
．． There is a heat insulating layer 36.36a on the outside of 33a, and on the outside thereof, a partition wall surface 36°35 forming the heat insulating layer 36, 36a.
Due to the presence of a, the influence of heat transfer from the muffler wall surface 38 is significantly reduced, and heating in the suction passage 32 while the refrigerant gas reaches the suction port 39 from the suction small space 31 is alleviated. I can do it. As a result, the temperature of the gas sucked into the cylinder 24b is maintained low, and refrigeration performance and refrigeration efficiency can be improved. In other words, small cylinder volume (2~7d
) compressor has a small volumetric flow rate and the influence of heating is large, so it is very effective as a means of improving efficiency. Also, in terms of cost and ease of manufacture, it is very cheap and easy, so it can be easily applied to small compressors.

In addition, FIG. 3 shows another embodiment, in which the heat insulating layer 36.36a was an air heat insulating layer in the previous embodiment, but a heat insulating material 40.40a is provided in the heat insulating layer 36.36a. It is filled with heat to further improve insulation.

Effects of the Invention As described above, the compressor of the present invention has an electric element, a compression element, and a suction muffler made of a heat insulating material such as plastic in a closed container, and a suction pipe connecting one end of the suction muffler. Communicating with or close to the suction hole of the valve rev plate,
A connecting pipe portion constituting the other end of the suction muffler is connected to or adjacent to a suction tube installed in the closed container, and the suction muffler has a small suction space connected at one end to the connecting pipe portion. and at least two partition plates forming a suction passage whose other ends open near the suction pipe, and a side opposite to the suction passage of the two partition plates forming the suction passage. The device has two partition outer walls, and a heat insulating layer is formed between the two partition plates and the two partition outer walls.

Furthermore, the compressor described above can be provided with a structure in which the heat insulating layer formed by the two partition plates and the two partition outer walls constituting the suction passage is filled with a heat insulating material such as a foam. The heat insulating layer formed by the two partition plates and the two partition outer walls, and the heat insulating material filled in the heat insulating layer, are affected by the heat transferred from the suction muffler outer wall to the refrigerant gas passing through the suction passage. This greatly reduces the amount of heat generated by the refrigerant gas passing through the suction passage, which makes it possible to obtain a sufficient insulation effect for the refrigerant gas passing through the suction passage. , and can be easily manufactured.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the structure of a compressor according to an embodiment of the present invention, FIG. 2 is a longitudinal sectional view taken along the line A-A of the suction muffler in FIG. FIG. 4 is a cross-sectional view showing the structure of a conventional compressor, and FIG. 5 is a partial cross-sectional view of a suction muffler of the conventional compressor. 21... Sealed compressor, 22... Sealed container, 23... Electric element, 24... Compression element, 25... Suction 77 ra, 26...
...Suction pipe, 27...Valve plate, 28.
...Suction hole, 29...Connection part, 30...
... Suction tube, 31 ... Suction small space,
32...Suction passage, 33.33a...
Partition plate, 36° 35a... Partition outer wall, 36
．． 36a...Insulating layer, 40...Insulating material.

Claims (2)

[Claims] (1) A closed container includes an electric element, a compression element, and a suction muffler made of a heat insulating material such as plastic, and a suction pipe forming one end of the suction muffler communicates with or is close to the suction hole of the valve plate, A connecting pipe part forming the other end of the suction muffler is connected to or adjacent to a suction tube installed in the closed container, and the suction muffler constitutes a small suction space with one end connected to the connecting pipe part,
It has at least two partition plates forming a suction passage whose other ends open near the suction pipe, and two partition outer walls on the side opposite to the suction passage of the two partition plates forming the suction passage. A hermetic compressor characterized in that a heat insulating layer is formed between the two partition plates and the two partition outer walls. (2) The hermetic compressor according to claim 1, wherein the heat insulating layer is filled with a heat insulating material such as a foam.