JPH03225084A - Hermetic type motor compressor - Google Patents

Abstract

PURPOSE:To reduce the heating of intake refrigerant gas so as to improve volume efficiency by connecting an insertion pipe, inserted with a slight clearance into an intake muffler inlet port, to an intake pipe by an adhesive coil spring, and forming the insertion pipe of low heat conductive material such as stainless material. CONSTITUTION:Low-temperature low-pressure refrigerant gas returned from a refrigerating cycle is led into a compression element part 3 through an intake gas lead-in passage. The refrigerant gas turned into high-temperature high- pressure gas being compressed by the compression element part 3, is led into the refrigerating cycle through a discharge line 18 and a discharge pipe. Since an insertion pipe 15' is formed of low heat conductive material such as stainless material, the heating of the refrigerant gas can be lowered. The increase of the specific volume of the refrigerant gas flowing into a cylinder can be thereby prevented to improve volume efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a sealed electric motor used in refrigerators, air conditioners, etc.

2. Description of the Related Art In recent years, hermetic electric compressors (hereinafter referred to as compressors) are required to have high efficiency and low noise.

An example of a conventional compressor will be described below with reference to the drawings.

3 and 4 are compressors shown in Japanese Patent Publication No. 64-1498, and FIG. 4 is a view taken from the line nn' in FIG. 3.

In the figure, 1 is a closed container, 2 is a compression element section elastically supported within the closed container 1, and 3 is an electric element section disposed above the compression element section λ.

≠ is a stator, j is a rotor, and constitutes an electric element s3. O is the cylinder head, 7 is the cylinder, t is the piston, ri is the crankshaft, and IO is the eccentric part around the crankshaft.
/, and these parts constitute the compression element section 2.

The compression element portion 2 is elastically supported within the closed container l by a spring 12. 13 is a copper suction pipe, /44 is a close coil spring whose lower end is press-fitted and fixed to suction pipe /3, /j is a copper insertion tube whose lower end is press-fitted and fixed to the upper end of the close coil spring l≠, 1
Reference numeral 6 denotes a suction muffler into which the insertion tube /J' is inserted, and constitutes a suction gas introduction path 17. /I is a discharge line, which is connected to a discharge pipe (not shown) attached to the closed container 7, and the other end is connected to a system (not shown).

Based on the above configuration, the operation of a conventional hermetic electric compressor will be explained.

The low-temperature, low-pressure refrigerant gas returned from the refrigeration cycle (not shown) passes through the suction gas introduction path/7 and is guided to the compression element 3. The refrigerant gas, which is compressed by the compression element 3 and becomes high temperature and high pressure, passes through a discharge line/r discharge pipe (not shown) and is guided to a refrigeration cycle (not shown).

Problem to be Solved by the Invention However, in the above configuration, when the electric motor is in operation, the refrigeration cycle (not shown) is
The low-temperature, low-pressure refrigerant gas that has returned is heated as it passes through the suction gas introduction path 17.

For this reason, the temperature of the refrigerant gas when it flows into the cylinder 7 increases, so the specific volume increases and the volumetric efficiency of the compressor decreases, t! l! It had a problem.

In view of the above problems, the present invention provides a compressor that reduces heating of refrigerant gas in an intake gas introduction path and has high volumetric efficiency.

Means for Solving the Problems The hermetic electric compressor of the present invention is provided with an elastically supported electric element part and a compression element part housed in a hermetic container, a suction pipe penetrating the said hermetic container, and a suction pipe penetrating the said compression element. fixing a suction muffler to the cylinder head of the section, arranging an insertion pipe inserted into the inlet hole of the suction muffler with a slight gap, and connecting the suction pipe and the insertion pipe with a tight fill spring;
The insertion tube is made of a material with low thermal conductivity such as stainless steel.

Function: In the present invention, the insertion tube is made of a material with a small thermal conductivity as described above, so that the suction gas is introduced from the refrigerant gas heated by the heat generated by the electric element part and the pressure element part in the closed container. This makes it possible to reduce heat transfer to the low-temperature, low-pressure refrigerant gas returning from the refrigeration cycle (not shown) on the road.

Therefore, it has become possible to improve the volumetric efficiency of the hermetic electric compressor.

Embodiment FIG. 1 is a sectional view of an embodiment of the hermetic electric compressor of the present invention, and FIG. 2 is a sectional view taken along line I--I' in FIG. Note that parts that are the same as those in the conventional example will be explained using the same symbols, and the configuration,
The parts with the same operations will be omitted.

Reference numeral ``L'' is an insertion tube made of a material with low thermal conductivity such as stainless steel, and one end of which is press-fitted and fixed to the upper end of the close coil spring 1, and the other end inserted into the suction muffler 16.

The operation of the above configuration of the hermetic electric compressor of the present invention will be explained.

The low-temperature, low-pressure refrigerant gas returned from the refrigeration cycle (not shown) passes through the suction gas introduction path 17 and is guided to the compression element section 3 . The refrigerant gas, which has been compressed by the compression element 3 and has become high temperature and high pressure, passes through a discharge line 1g1 discharge pipe (not shown) and is led to a refrigeration cycle (not shown).

In a hermetic electric compressor that operates in this manner, the insertion tube /j' is made of a material with low thermal conductivity such as stainless steel, so the refrigerant gas inside the insertion tube /j' is lower than in the conventional example. Heating can be reduced.

Therefore, an increase in the specific volume of the refrigerant gas flowing into the cylinder 7 can be prevented, and the volumetric efficiency can be improved.

Advantages of the invention: Necessary/77/1 By making the insertion tube a material with low thermal conductivity, such as stainless steel, as described in AiI, the electric element part inside the closed container,
This prevents heat transfer from the refrigerant gas heated by the heat generated by the compression element to the refrigerant gas in the insertion tube, reducing suction heating of the refrigerant gas, thereby preventing an increase in the specific volume of the suction gas. Therefore, the volumetric efficiency of the hermetic electric compressor can be improved.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of an embodiment of the hermetic electric compressor of the present invention, FIG. 2 is a cross-sectional view taken along line I I in FIG.
The figure shows a sectional view of a conventional hermetic electric compressor, and FIG. 4 shows a sectional view taken along line II-I' in FIG. 3. 1: Sealed '8 vessel, 2: Compression element, 3: Electric element,
/3: Suction pipe, 1lI-: Close coil spring 1/j':
Insertion tube, 16: Suction muffler.

Claims (1)

[Claims] An elastically supported electric element section and a compression element section are housed in a closed container, a suction pipe is provided that penetrates the closed container, a suction muffler is fixed to the cylinder head of the compression element section, and an inlet hole of the suction muffler is fixed to the cylinder head of the compression element section. An insertion tube is provided with a slight gap between the suction tube and the insertion tube, the suction tube and the insertion tube are connected by a tight coil spring, and the insertion tube is made of a material with low thermal conductivity such as stainless steel. Hermetic electric compressor.