JPH0331596A - Closed type compressor - Google Patents

Abstract

PURPOSE:To restrain any temperature increase in an intake pipe and intake gas by pressing one end of an intake pipe with a small coefficient of thermal conductivity in an anti-rotor side housing for forming a compression element, and interposing a gasket between a projecting portion near the above one end and the end surface of the housing. CONSTITUTION:A stator 2 is fixed in the interior of a closed case 1, and a crankshaft 5 having a rotor 4 fixed to one end thereof is disposed concentrically with the center of the inner wall of a cylinder 6 in the interior of the stator 2. A roller 7 is rotatably installed on the eccentric portion of the crankshaft 5, and the roller forms a compression element 11 together with a vane 10 for partitioning a compression chamber 9. In this arrangement, one end of an intake pipe 16 formed by material with a small coefficient of thermal conductivity such as stainless or the like, is pressed in a communicating hole 13 of an anti- rotor side housing 8. A gasket 17 is fixed between a large-diameter projecting portion 16a formed near one end of the intake pipe 16 and the end surface of the anti-rotor side housing 8.

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.

BACKGROUND OF THE INVENTION In recent years, rotary compressors, which have become established in the industry, are desired to be highly efficient.

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 6, to which a rotor 4 is fixed at one end, is disposed within the stator 2 concentrically with the center of the inner wall of the cylinder 6. A roller 7 is attached to the eccentric part of the above two link shafts 5.
is rotatably mounted, and the rotor-side housing 3 and the anti-rotor side housing 8 hermetically close both end faces of the cylinder 60, and the compression chamber 9 is in contact with the outer periphery of the row 27 and is connected to a high pressure chamber and a low pressure chamber. The compression element 11 is configured together with the bay 710 that partitions the compressor element 11 into two parts. The suction pipe 12 is made of copper and passes through the sealed case 1 and is connected to the sealed case 1.
71, and is press-fitted and fixed airtightly into a communication hole 13 provided in the anti-rotor side housing 8, and 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 77 lar (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 16 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. It is heated by high temperature and high pressure refrigerant gas, and as shown in FIG. 6, the refrigerant gas temperature T at the tip of the suction pipe 12 on the refrigeration system side
, Yuyoshi gets high. 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. Therefore, the temperature distribution of the suction pipe 12 is as shown in FIG.
As shown in e, the temperature is close to that of the sealed case 1 and the compression element 11, and the temperature becomes high.

Therefore, 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 the refrigerant gas in the suction pipe 12 is heated as shown in FIG. The temperature T, 9 increases by ΔT111 degrees at the tip of the suction pipe 12 on the compression element side, and as it flows into the compression chamber 9, the specific volume of the refrigerant increases, causing a problem of lowering the volumetric efficiency. Was.

In order to solve the above problem, when a suction pipe made of a material with low thermal conductivity such as stainless steel is used, the rigidity of the pipe is high, so when the pipe is press-fitted into the communication hole of the housing on the opposite side of the rotor, Due to poor compatibility, high temperature and high pressure refrigerant gas leaks and flows into the low pressure chamber of the compression chamber, resulting in a reduction in 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 is provided with a suction pipe made of a material with low thermal conductivity such as stainless steel, and a suction pipe on the communication hole side of the suction pipe. A protrusion with a large diameter is provided near the end, and a gasket is interposed between the protrusion and the end surface of the housing on the side opposite to the rotor.

Effect: With the above-described configuration, the present invention can prevent heat conduction from the high temperature and high pressure refrigerant gas in the closed case and the closed cane to the refrigerant gas in the suction pipe, and reduce suction heating of the refrigerant gas. In addition, since leakage of refrigerant gas from the press-fitted portion of the suction pipe can be prevented, 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.

1 and 2 show a hermetic compressor according to 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, and has a protrusion 16a with a large diameter near the end of the suction pipe 16 on the side of the communication hole; A gasket 17 is hermetically pressed between the protrusion 16a and the end surface of the housing 8 on the side opposite to the rotor.

In a hermetic compressor having such a structure, the low-temperature, low-pressure refrigerant gas passing through the suction pipe 16 is thermally separated from the high-temperature state of the closed case 1 and the high-temperature, high-pressure refrigerant gas inside the closed case 1. Because of the insulation, as shown in FIG. 3, the temperature of the refrigerant gas in the suction pipe 16 is T8. (solid line in the figure), the intake gas heating becomes Δ"2g, which can be reduced by Δ"18-Δ"2g compared to the conventional case.

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 gasket 17 is compressed and fixed airtight between the protrusion 16a provided near the press-fit fixing part and the housing 8 on the anti-rotor side, high-temperature and high-pressure refrigerant gas leaks from this part and enters the low-pressure chamber of the compression chamber 9. There is no inflow into the country. 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 a protrusion with a large diameter is provided near the end of the suction pipe on the side of the communication hole, so that the protrusion is opposite to the protrusion. By sandwiching the gasket between the gasket and the end surface of the rotor-side housing, it is possible to suppress an increase in the temperature of the suction pipe, and the 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 inhaler according to an embodiment of the present invention, FIG. 2 is an enlarged sectional view of the main part of FIG. 1, and FIG. 3 is a sectional view of a hermetic compressor of the present invention. FIG. 4 is a sectional view of a conventional hermetic compressor, and FIG. 6 is a temperature distribution diagram of a suction pipe and suction gas of a conventional hermetic compressor. 16...Suction pipe, 16a...Protrusion, 17...Gasket. Fig. 2 Fig. 3 Fig. 8-A-8 Re-entry pipe standing 1L Fig.-A-8 Suction pipe size

Claims (1)

[Claims] An electric element consisting of a stator press-fitted and fixed in a sealed case, a rotor driven by the stator, a crankshaft having an eccentric part press-fitted to the rotor, 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. a suction pipe made of a material with low thermal conductivity, such as stainless steel, which is press-fitted into a communication hole communicating with the suction pipe, and a protrusion with a large diameter is provided near the end of the suction pipe on the side of the communication hole, and the protrusion and the A hermetic compressor, characterized in that a gasket is interposed between the end face of the housing on the side opposite to the rotor.