JPH1061555A - Rotary compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent heating of an intake pipe so as to improve efficiency by arranging a stainless socket made of a material having a low thermal conductivity between an closed casing and the intake pipe. SOLUTION: A compressing element and a electrically driven element for driving the compressing element are arranged in a closed casing 1, a socket made of a material having a small thermal conductivity is arranged between the closed casing 1 and an intake pipe 10 for sucking a refrigerant, and an intake pipe 10 is fixed thereby. The closed casing 1 is heated by means of heating at the time of compressing, heating of a stator, and the like. The heat transmission from the closed casing 1 to the intake pipe 10 is thus reduced, and a heating degree of the intake pipe 10 is reduced. It is thus possible to prevent the refrigerant from heating by the intake pipe 10 so as to improve efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improving the efficiency of a rotary compressor used for a refrigerator or the like.

[0002]

2. Description of the Related Art In recent years, demands for higher efficiency of refrigerators and vending machines have increased.

Conventionally, a rotary compressor is disclosed in Japanese Patent Laid-Open No. 1-253.
No. 578 is known.

FIG. 3 shows the structure of a conventional rotary compressor. In FIG. 3, reference numeral 1 denotes a closed casing, A denotes an electric element, and a stator 2 fixed in a closed casing 1 and a rotor serving as a rotor. 3. The compression element B has a shaft 4 fixed to the rotor 3, a roller 5 penetrating through the shaft 4, a cylinder 6 for accommodating the roller 5, a sub-bearing 7 of the shaft 4, and a main bearing 8 of the shaft 4. 9 is pressed by the roller 5 with a vane, and partitions the inside of the cylinder 6 into a high pressure side and a low pressure side. Reference numeral 10 denotes a suction pipe which is welded to the closed casing 1 and communicates with the low pressure side.

In the rotary compressor configured as described above, the shaft 4 is rotated by the electric element A, and the roller 5 is eccentrically rotated with the rotation, so that the roller 5 is introduced into the cylinder through the suction pipe 9. The compressed refrigerant is compressed. The compressed refrigerant is radiated by the hot plate 15 through the inner pipe of the discharge pipe 12, cooled, and then returned again to the return pipe 1.
3, is opened into the closed casing 1 through the inner pipe, cools the electric element A and the compression element B, and then flows to the high pressure side of the refrigeration cycle.

[0006]

However, in the above conventional structure, the suction pipe is heated by heat transfer from the closed casing, compressed gas, heat generation of the stator, and the like, so that the density of the refrigerant is reduced and the pressure is reduced. There is a problem that an increase occurs, resulting in a decrease in volumetric efficiency of the compressor and an increase in input.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a high-efficiency rotary compressor by preventing heating of a suction pipe.

[0008]

According to the first aspect of the present invention, a socket made of a material having low thermal conductivity is provided between a closed casing and a suction pipe.

Further, in the second aspect of the present invention, a stainless steel socket is provided between the closed casing and the suction pipe.

This makes it difficult for heat to be transmitted from the closed casing to the suction pipe. According to the third aspect of the present invention, the refrigerant once compressed and cooled outside the closed casing is introduced again into the closed casing and blown to the suction pipe.

Thus, the suction pipe can be cooled by the cooled refrigerant.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention has a compression element and an electric element for driving the compression element in a closed casing, and further comprises a space between the closed casing and a suction pipe for sucking refrigerant. It has a socket made of a material having a low thermal conductivity, and has an effect of reducing heat transmitted from the closed casing to the suction pipe by the socket as the connection portion.

The invention according to claim 2 is provided with a socket made of stainless steel, and has an effect of reducing the heat transmitted from the closed casing to the suction pipe by the socket as the connection portion.

According to a third aspect of the present invention, a compression element and an electric element for driving the compression element are provided in a closed casing, and a refrigerant once compressed and cooled outside the closed casing is introduced into the closed casing again. The cooling device has a configuration in which the suction pipe is cooled by spraying on the suction pipe, and has a function of cooling the suction pipe by directly applying the cooled refrigerant to the suction pipe.

FIG. 1 shows an embodiment of the present invention.
This will be described with reference to FIG. The same parts as those of the conventional example are denoted by the same reference numerals, and detailed description will be omitted.

(Embodiment 1) FIG. 1 is a sectional view of a main part of an embodiment of the present invention. In FIG. 1, a compression element B and an electric element A for driving the compression element B are provided in a closed casing 1. A material socket 11 having a low thermal conductivity is provided between the closed casing 1 and the suction pipe 10 for sucking the refrigerant, and the suction pipe 10 is fixed. Further, the socket 11 of the compressor according to claim 2 is made of stainless steel.

With the above-described configuration, the shaft 4 is rotated by the electric element A, and the roller 5 is eccentrically rotated with the rotation, whereby the shaft 4 is introduced into the cylinder 6 through the inner pipe of the suction pipe 10. The compressed refrigerant is compressed. Here, the closed casing 1 is heated by heat generated during compression or heat generated by the stator 2. Here, a socket 11 made of a material having a low thermal conductivity is provided between the closed casing 1 and the suction pipe 10.
1, the heat transfer from the closed casing 1 to the suction pipe 10 is reduced, and the heating of the suction pipe 10 is reduced.

(Embodiment 2) FIG. 2 is a cross-sectional view of a rotary compressor according to an embodiment of the present invention. The compressor has a compression element and an electric element for driving the same in a closed casing 1 and has a hermetic seal. A return pipe 14 attached to the casing 1 opens in the direction of the suction pipe 10 in the closed casing 1.

With the above configuration, the refrigerant compressed through the inner pipe of the suction pipe 10 passes through the inner pipe of the discharge pipe 12, is radiated and cooled by the hot plate 15, and then returned to the return pipe of the compressor again. And is opened into the closed casing 1. Here, since the cooled refrigerant is directly blown onto the compressed refrigerant, the suction pipe 10 heated by the heat generated by the stator, etc., the suction pipe 10 is cooled.

[0020]

As described above, according to the present invention, a socket made of a material having low thermal conductivity and a stainless steel socket are provided between the closed casing and the suction pipe for sucking the refrigerant. Since the heat transfer from the closed casing is reduced, the advantageous effect of reducing the heating of the suction pipe is obtained. In addition, since the refrigerant once compressed and cooled outside the closed casing is introduced again into the closed casing and blown to the suction pipe to cool the suction pipe, it is provided with a means for cooling the suction pipe. ,
Even when the suction pipe is heated, the cooled refrigerant is directly blown onto the suction pipe, so that an advantageous effect that the heating of the suction pipe can be prevented can be obtained.

[Brief description of the drawings]

FIG. 1 is an enlarged view of a main part of a rotary compressor according to first and second embodiments of the present invention.

FIG. 2 is a sectional view of a rotary compressor according to a third embodiment of the present invention.

FIG. 3 is a sectional view of a conventional rotary compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed casing 10 Suction pipe 11 Socket 14 Return pipe of this example A Electric element B Compression element

Claims (3)

[Claims] 1. A rotary type having a compression element and an electric element for driving the compression element in a closed casing, and having a socket made of a material having a low thermal conductivity between the closed casing and a suction pipe for sucking a refrigerant. Compressor. 2. The socket according to claim 1, wherein the socket is made of stainless steel.
The rotary compressor as described. 3. A compressor having a compression element and an electric element for driving the compression element in a closed casing. The refrigerant once compressed and cooled outside the closed casing is again introduced into the closed casing and blown into the suction pipe. A rotary compressor equipped with a means for cooling a suction pipe.