JPH02267384A - 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 a cupper plating to the refrigerating system side top end 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 coming in contact with the outer periphery of the roller 7. In this case, a suction pipe 16 is formed of a 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 refrigerating system side top end 16a of the closed container 1 is plated with cupper.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention 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.

Stator 2 and rotor housing 3 are placed inside the sealed case 1.
is fixed, and a crankshaft 6 having a rotor 4 fixed to one end thereof is disposed within the stator 2 concentrically with the center of the inner wall of the cylinder 6. A roller 7 is rotatably mounted on the eccentric portion of the crankshaft 5, and the rotor side housing 3 and the anti-rotor side housing 8 hermetically close both end surfaces of the cylinder 6, and the A compression element 11 is configured together with a vane 10 that contacts the outer periphery of the roller 7 and partitions the compression chamber 9 into a high pressure chamber and a low pressure chamber. The suction nozzle 12 is made of copper, passes through the sealed case 1, is fixed to the sealed case 1, and is press-fitted airtightly into a communication hole 13 provided in the housing 8 on the side opposite to the rotor. It is fixed and is firmly attached 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 1
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 refrigerant gas at a high temperature and high pressure. 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.
It's getting more expensive. At this time, when the average temperature of the sealed case 1 is T and the average temperature of the compression element 11 is Tp, the suction pipe 7 is fixed and press-fitted into the communicating hole 13 of the sealed case 1. , the temperature distribution of the suction pipe 12 is as shown in T in FIG.
As shown in FIG. 2, the temperature is close to that of the closed case 1 and the compression element 11.

Therefore, the refrigerant gas that has flowed in at the refrigeration system side tip of the suction pipe 12 at a temperature of 1.5 in is heated by the suction pipe 12, and as shown in FIG. T8° has a problem in that 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, increasing the specific volume of the refrigerant and reducing volumetric efficiency. .

In view of the above problems, the present invention provides a compressor that prevents heating of the suction refrigerant gas in the suction pipe, increases volumetric efficiency, improves weldability between the suction pipe 12 and the low-pressure side pipe, and is excellent in mass production. It is something to do.

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 refrigeration system side tip of the suction pipe. The parts are copper plated.

Effect The present invention can prevent heat conduction from the closed case and the high temperature and high pressure refrigerant gas in the closed case to the refrigerant gas in the suction pipe, and reduce suction heating of the refrigerant gas. This improves the volumetric efficiency of the compressor, and since the tip of the suction pipe on the refrigeration system side and the low-pressure side pipe are made of copper when assembling the refrigeration system, welding workability 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 of 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. Reference numeral 16 denotes a suction pipe made of a material with low thermal conductivity such as stainless steel, one end of which is press-fitted into the communication hole 13 in an airtight manner, the middle part is airtightly fixed to the sealed case 1, and the tip part on the refrigeration system side. Copper plating is applied at 16a.

In a hermetic compressor having such a structure, the low-temperature, low-pressure refrigerant gas passing through the suction pipe 16 and 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. In order to insulate the
Compared to the conventional example (broken line in the figure), the refrigerant gas temperature in the suction pipe 16 is Ti1g (solid line in the figure), and the suction gas heating is ΔT2s, which is ΔT1B-ΔT2 compared to the conventional example.
can be reduced by g.

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.

Furthermore, when incorporating the hermetic compressor into a refrigeration system, since the low-pressure side pipe 14 on the refrigeration system side and the refrigeration system side tip 16a of the suction pipe are made of copper, silver soldering or copper soldering work is required. can be easily done,
By making the suction pipe 16 from a material with low thermal conductivity, such as stainless steel, it is possible to prevent deterioration in welding workability and improve mass productivity.

Effects of the Invention As described above, the present invention has a suction pipe made of a material with low thermal conductivity such as stainless steel, and has copper plating applied to the tip of the suction pipe on the refrigeration system side. It is possible to suppress the rise in temperature and reduce the heating of the suction refrigerant gas passing through the suction pipe.
It is possible to prevent an increase in the specific volume of suction gas, improve the volumetric efficiency of the hermetic compressor, and facilitate silver solder or copper solder welding work, improving mass productivity.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a hermetic compressor equipped with an inhalation device according to an embodiment of the present invention, FIG. 2 is a temperature distribution diagram of the suction pipe and suction gas of the hermetic compressor of the present invention, and FIG. 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, 16a... Refrigeration system side tip. Name of agent: Patent attorney Shigetaka Awano and one other person Fig.-A B-β Inhalation nomaibui'ii Fig.-A +X and 8-ε Inhalation life 0ii

Claims (1)

[Claims] An electric element consisting of a stator press-fitted into a sealed case, a rotor driven by the stator, a crankshaft press-fitted into the rotor and having an eccentric portion, and compressed concentrically with the rotation center of the crankshaft. A cylinder forming a chamber, a rotor-side housing that airtightly closes both end surfaces of the cylinder, and an anti-rotor side housing, which is attached to the eccentric part and rolls along the inner wall of the cylinder by rotation of the shaft. and 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, the low pressure chamber is airtightly fixed to the sealed case and provided in the compression element. What is claimed is: 1. A hermetic compressor comprising: a suction pipe made of a material with low thermal conductivity press-fitted into a communication hole communicating with the compressor; and copper plating is applied to the tip of the suction pipe on the refrigeration system side.