JPH03258994A - Sealed type rotary compressor - Google Patents

Abstract

PURPOSE:To reduce the heating of an inlet coolant gas and improve the capacity efficiency of a compressor by providing a nearly cylindrical heat insulating plate having at least one end formed into trumpet shape in the inside of an inlet pipe airtighlty fixed to a compression element and a sealed vessel. CONSTITUTION:An electric element 2 and a compression element 4 are received in a sealed vessel 1. An inlet pipe 7 airtightly fixed to the compression element 4 and the sealed vessel 1 is provided. A nearly cylindrical heat insulating plate 15 having at least one end formed into trumpet shape is provided in the inside of the inlet pipe 7. As a heat insulating air layer is formed between the inlet pipe 7 and the heat insulating plate 15, thus, the heat transfer from the sealed vessel 1, the compression element 4 and a high temperature and high pressure gas to the inlet pipe 7 can be reduced. Hence, the heating of the inlet coolant gas can be reduced, so that the capacity efficiency of the compressor can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a hermetic rotary compressor that can be incorporated into a refrigeration device such as a refrigerator.

BACKGROUND OF THE INVENTION In recent years, closed-type rotary crushers in the refrigeration and air-conditioning industry have become extremely popular in the market, and are on the verge of replacing closed-type reciprocating crushers.

Hereinafter, an example of a conventionally known hermetic rotary compressor as found in Japanese Patent Application Laid-Open No. 1-318783 will be described with reference to the drawings. FIG. 5 shows a conventional closed type rotary presser.

As shown in FIG. 5, a stator 3 and a compression element 4 for transmitting an electric element 2 are fixed in a closed container 1, and a crankshaft 6 with a rotor 6 fixed at one end is attached to the stator 3. It is arranged concentrically with the axis. The suction pipe 7 is made of copper or passes through the hermetic container 1 and is hermetically secured to the compression element 4, and the hermetic container 1 and the suction pipe 7 are also hermetically secured.

At the bottom of the groove, the low-temperature, low-pressure refrigerant gas returned from the refrigeration cycle /I/ (not shown) passes through the suction pipe 7 and flows into the compression chamber 8 of the compression element 4 .

The refrigerant gas compressed by the pressure element 4 to a high temperature and high pressure passes through a discharge valve (not shown) with metal teeth and is discharged into the closed container 1. After fc, the refrigerant gas is discharged into the closed container 1 through a discharge pipe 9 disposed in the closed container 1. The structure is such that it is sent to the refrigeration cycle.

Problems to be Solved by the Invention However, in the above configuration, when the compressor is in operation, the closed container 1 is filled with high temperature and high pressure refrigerant gas. It is heated by the high-temperature, high-pressure refrigerant gas, and as shown in FIG. 6, the refrigerant gas temperature at the inlet surface of the suction pipe 70 (section A in FIG. 6) becomes higher by V than Tin.

At this time, the average temperature eTca of the closed container 1. .

When the average temperature of the compression element 4 is TP, since the suction pipe 7 is fixed to the sealed container 1 and the compression element 4, the heat conduction of the high-salt high-pressure gas in the fixed portion and the sealed container is Yo! The temperature distribution of the suction pipe 7 reaches a high temperature close to the temperature of the closed container 1 and the pressure element 4, as shown in FIG.

Therefore, the refrigerant gas flowing into the inlet of the suction pipe 7 at a temperature of Tin is heated by the suction pipe 7, and as shown in FIG. At the outlet surface of the suction pipe 7 (section B in FIG. 6), the temperature rises by Tls and flows into the compression chamber 8, so the specific volume of the refrigerant increases, which causes a problem of lowering the volumetric efficiency. was.

In view of the above problems, the present invention provides a compressor that prevents heating of the suction refrigerant gas flowing into the suction pipe 7 and has high volumetric efficiency.

Section = e Means for Solving In order to solve the above problems, the hermetic rotary compressor of the present invention is provided with a substantially cylindrical heat shield plate with at least one side shaped like a trumpet inside the suction pipe. .

According to the above-mentioned structure, the heat shield plate with high thermal and mechanical strength forms an insulating air layer between the suction pipe and the heat shield plate, so that the high temperature and high pressure of the closed container, compression element, and closed valley device can be maintained. The heat transfer from the refrigerant gas to the refrigerant gas in the suction pipe is completely reduced, and the suction temperature of the refrigerant gas to the compression element can be completely reduced.

EXAMPLE Hereinafter, a hermetic rotary compressor according to an example of the present invention will be described with reference to drawing 'C8.

Note that parts that are the same as those in the conventional example are designated by the same reference numerals, and explanations thereof will be omitted.

FIG. 1 is a sectional view of a closed rotary pressure machine according to an embodiment of the invention, FIG. 2 is a curved view of the main part of FIG. 1, and FIG. 3 is a partial view. 1, 2, and 3, reference numeral 15 denotes a heat shield plate made of stainless steel material with a low heat transfer coefficient stretched inside the suction pipe 7. The heat shield plate 15 is wound into a substantially cylindrical shape, and both ends are trumpet-shaped 1.
It is bent to 7. The heat shield plate 16 has sufficient strength both thermally and mechanically, and is stretched over the suction pipe 7 due to its self-nupping property to form a stable heat insulating air layer 16.

In the above belief, the low-temperature, low-pressure refrigerant gas returned from the refrigeration cycle IV (not shown) flows through the suction pipe 7' (i
- The refrigerant gas passes through the compression chamber 8 in the compression element 4 and becomes high temperature and pressure due to the compression element 4.
After passing through the gold (not shown) and being discharged into the circular space of the sealed container 1, it is sent to the refrigeration cycle through a discharge pipe 9 fixed to the sealed container 1.

A heat insulating air layer 16 is formed by providing an approximately cylindrical stainless steel material with a low heat transfer coefficient or a ranal shield plate 16 with both ends bent into a trumpet shape inside the suction pipe 7, so that high temperature and high pressure refrigerant gas Heat transfer from the heated compression element 4 and closed container 1 to the suction gas passing through the suction pipe 7 is reduced.

Therefore, as shown in FIG. 4, compared to the conventional example, the refrigerant gas temperature in the suction pipe 7 is T8°, and the suction gas addition is 2 seconds, which can be reduced compared to the conventional example.

Therefore, the specific volume of the refrigerant flowing into the compression chamber 8 can be prevented from increasing, and the volumetric efficiency can be improved.

Effects of the Invention As described above, the present invention provides a heat shield plate with high thermal and mechanical strength, with at least one side of the suction pipe of a hermetic rotary compressor having a trumpet shape and having a substantially inner cylindrical shape.
Since an insulating air layer is formed between the suction pipe and the heat shield, it is possible to reduce heat transfer from the closed container, compression element, and high-temperature, high-pressure gas to the suction pipe, and to reduce the effects of suction refrigerant gas. , it is possible to suppress the layering of the specific volume of the suction gas and improve the volumetric efficiency of the compressor.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a hermetic rotary compressor showing an embodiment of the present invention, FIG. 2 is a sectional view of the main part in FIG. 1, and FIG. 3 is a perspective view of the heat shield plate shown in FIG. 1. Figure 4 is a diagram of the intake pipe and suction gas temperature distribution of the sealed rotary pressure s Iso, Figure 5 is a conventional hermetic rotary compressor, and Figure 6 is the intake of a conventional hermetic rotary compressor. It is a temperature distribution diagram of a pipe and suction gas. 1...Airtight container, 2...Electric element, 4
...Compression element, 7...Suction pipe, 1
6... Heat shield plate.

Claims (1)

[Claims] A hermetic rotary compressor that houses an electric element and a compression element in a hermetic container, and has a suction pipe that is hermetically secured to the compression element and also to the hermetic container, the compressor comprising: A hermetic rotary compressor characterized in that a substantially cylindrical heat shield plate with at least one side shaped like a trumpet is provided inside a suction pipe.