JPH02267385A - Closed type compressor - Google Patents

Abstract

PURPOSE:To suppress the temperature of a suction pipe from being increased to increase volume efficiency of a compressor by forming the suction pipe, communicating to the low pressure chamber of a compression element, of a material with small heat conductivity, and applying the coating of an elastic and organic material to the communicating portion of the suction pipe. CONSTITUTION:A stator 2 and a rotor-side housing 3 are fixed in a closed container 1, and a crankshaft 5, at the one end of which a rotor 4 is fixed, is provided in the stator 2 in the same axis as a cylinder 6. Also, a roller 7 is mounted rotatably at the eccentric portion of the crankshaft 5, and a compression element 11 is composed of the roller, housings 3 and 8 choking both end surfaces of the cylinder 6, and a vane 10 separating a compression chamber 9 by coming in contact with the outer periphery of the roller 7. In this case, a suction pipe 16 is formed of material with small heat conductivity such as stainless steel, etc., and the one end of it is pressed into the communicating hole 13 of the housing 8 at a position opposite to the rotor. The pressed-in portion of the suction pipe 16 is coated with an elastic and organic material 16a such as Teflon, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a hermetic compressor incorporated in a refrigeration device such as a refrigerator-freezer.

2. Description of the Related Art The structure of a conventional hermetic compressor (hereinafter referred to as a compressor) is shown in FIG.

A stator 2 and a rotor-side housing 3 are fixed in a sealed case 1, and a crankshaft 5 having a rotor 4 fixed at one end is disposed within the stator 2 concentrically with the center of the inner wall of a cylinder 6. A roller 7 is provided on the eccentric portion of the crankshaft 5.
The rotor-side housing 3 and the anti-rotor side housing 8 hermetically close both end surfaces of the cylinder 6, and the compression chamber 9 is connected to the outer periphery of the roller 7 and is connected to a high-pressure chamber and a low-pressure chamber. Together with the vane 10 that partitions the compressor element 11, it constitutes a compression element 11. The suction pipe 12 is made of copper, passes through the sealed case 1, is fixed to the sealed case 1, and is hermetically press-fitted into a communication hole 13 provided in the housing 8 on the side opposite to the rotor. It is fixed to a low pressure side pipe 14 made of copper of a refrigeration system (not shown).

In the above configuration, the low-temperature, low-pressure refrigerant gas returned from the refrigeration system passes through the suction pipe 12 and flows into the compression chamber 9. The refrigerant gas, which is compressed in the compression chamber 9 and becomes high temperature and high pressure, passes through a muffler (not shown),
After being released into the sealed case 1, the sealed case 71
It is sent out to the refrigeration system from a discharge pipe 15 arranged in the refrigeration system.

Furthermore, the low pressure side pipe 14 and the suction pipe 12 are
It is fixed by silver or copper solder welding during system assembly.

Problems to be Solved by the Invention However, in the above configuration, when the compressor is in operation, the closed case 1 is filled with high temperature and high pressure refrigerant gas, and the closed case 1 and the compression element 11 are The temperature of the refrigerant gas at the tip of the suction pipe 12 on the refrigeration system side increases as shown in Figure 4.
Higher than in. At this time, when the average temperature of the closed case 71 is TOAB@s and the average temperature of the compression element 11 is Tp, the suction pipe 7 is connected to the closed case 1.
Since it is fixed and press-fitted into the communication hole 13, it is heated by the heat conduction of the high temperature and high pressure gas in the fixed part and the sealed case 1, and the temperature distribution of the suction pipe 12 is as shown in Tpipe in FIG. , the temperature is close to that of the hermetic case 71 and the compression element 11.

In this case, the refrigerant gas that has entered the tip of the suction pipe 12 on the refrigeration system side at a temperature of Tin is heated by the suction pipe 12, and as shown in FIG. The temperature rises by ΔT1s at the tip of the suction pipe 12 on the compression element side and flows into the compression chamber 9, which increases the specific volume of the refrigerant and reduces the volumetric efficiency.

In view of the above problems, the present invention provides a compressor with high volumetric efficiency, which prevents heating of suction refrigerant gas in a suction pipe and prevents leakage of refrigerant gas from a press-fit fixed part of the suction pipe. .

Means for Solving the Problems In order to solve the above-mentioned problems, the hermetic compressor of the present invention includes a suction pipe made of a material with low thermal conductivity such as stainless steel, and a press-fitting fixing part of the suction pipe. It is coated with a highly elastic organic material such as Teflon.

Effects The present invention, with the above configuration, can prevent heat conduction from the sealed case and the high temperature and high pressure refrigerant gas in the sealed case to the refrigerant gas in the suction pipe, and reduce suction heating of the refrigerant gas. Since it is possible to prevent refrigerant gas from leaking from the press-fitted part of the suction pipe, the volumetric efficiency of the compressor can be improved.

EXAMPLE Hereinafter, a hermetic compressor according to an example of the present invention will be described with reference to the drawings. Note that parts that are the same as those in the conventional example will be described using the same reference numerals, and parts that are the same in structure and operation will be omitted.

FIG. 1 shows a hermetic compressor showing an embodiment of the present invention. 16 is a suction pipe made of a material with low thermal conductivity such as stainless steel, and one end is made of highly elastic organic material 1 such as Teflon.
6a is coated, and is press-fitted and fixed airtightly into the communication hole 13 via the organic material 1f3a, and is airtightly fixed to the sealed case 1 at the intermediate portion.

In a hermetic compressor having such a structure, the low-temperature, low-pressure refrigerant gas passing through the suction pipe 16, the high-temperature state of the hermetic case 1, and the high-temperature, high-pressure refrigerant gas inside the hermetic case 1 are thermally separated. Because of the insulation, as shown in FIG. 2, the refrigerant gas temperature in the suction pipe 16 is Tsg (solid line in the diagram) compared to the conventional example (broken line in the diagram), and the suction gas heating is ΔT2s, compared to the conventional example (broken line in the diagram). It can be reduced by ΔT1g - ΔT2s compared to .

Therefore, an increase in the specific volume of the refrigerant flowing into the compression chamber 9 can be prevented, and the volumetric efficiency can be improved.

Also, when press-fitting and fixing the suction pipe 16 into the communication hole 13,
Since the press-fit fixing portion is coated with a highly elastic organic material 16a such as Teflon, high temperature and high pressure refrigerant gas will not leak from this portion and flow into the low pressure chamber of the compression chamber 9.

Therefore, a compressor with high volumetric efficiency can be obtained.

Effects of the Invention As described above, the present invention includes a suction pipe made of a material with low thermal conductivity such as stainless steel, and coats the press-fitted part of the suction pipe with a highly elastic organic material such as Teflon. temperature rise can be suppressed, and heating of the suction refrigerant gas passing through the suction pipe can be reduced.

Further, since high temperature and high pressure refrigerant gas does not leak from the press-fitting part of the suction pipe, the volumetric efficiency of the compressor can be improved.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a hermetic compressor equipped with an inhalation device according to an embodiment of the present invention, FIG. 2 is a diagram of the suction pipe and temperature distribution of suction gas in the hermetic compressor of the present invention, and FIG. 3 is a diagram of the temperature distribution of suction gas. FIG. 4 is a sectional view of a conventional hermetic compressor, and is a temperature distribution diagram of the suction pipe and suction gas of the conventional hermetic compressor. 16... Suction pipe, 15a... Organic material. Name of agent: Patent attorney Shigetaka Awano and one other person Figure 3-B

Claims (1)

[Scope of Claims] An electric element consisting of a stator press-fitted into a sealed case and a rotor driven by the stator; a crankshaft having an eccentric portion press-fitted into the rotor; and the crankshaft. a cylinder that forms a compression chamber concentrically with the rotation center of the cylinder; a rotor side housing that airtightly closes both end surfaces of the cylinder; and an anti-rotor side housing that is attached to the eccentric part and that rotates the cylinder by rotation of the shaft. a compression element having a vane that is in contact with the outer periphery of the roller and partitions the compression chamber into a high pressure chamber and a low pressure chamber; A suction pipe made of a material with low thermal conductivity is press-fitted into a communication hole that communicates with the low-pressure chamber provided in the compression element, and the press-fitted portion of the suction pipe is coated with an organic material rich in elasticity. Features: Hermetic compressor.