JPS6237980Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a refrigerant suction pipe device for a hermetic compressor.

BACKGROUND ART Conventionally, a so-called high-pressure shell type compressor has been known in which compressed refrigerant gas is directly sucked into a closed container and then discharged to the outside from the closed container.

The structure of the refrigerant suction pipe device for such a hermetic compressor is shown in FIGS. 1 and 2, and the lower end opening of the vertically elongated suction pipe 2 is welded to the hermetic container 1 by means such as wax welding or electric welding. The suction pipe 2 is fixedly connected to the other end of the suction pipe 2 for communication, and a suction conduit 4 through which refrigerant gas from an evaporator (not shown) is introduced is fixed and connected to the opening at the other end of the suction pipe 2.

However, the conventional structure of the refrigerant suction pipe device as described above has the following drawbacks.

That is, a part of the thermal energy generated inside the compressor is released to the outside air from the surface of the closed container 1, and a part of it is radiated toward the suction pipe 2 disposed near the container 1. Further, since the lower end opening of the suction pipe 2 is fixed to the closed container 1, heat is directly transferred from the container 1 to the suction pipe 2 through the fixed portion 6.

Therefore, part of the thermal energy transferred to the suction pipe 2 is released to the outside air, but most of it is transferred to the suction refrigerant gas 7 flowing inside the suction pipe 2, and as a result, the refrigerant sucked into the compressor is reduced. This has been a disadvantage in that it causes a rise in temperature and reduces the volumetric efficiency of the compressor.

Therefore, in view of the above-mentioned conventional circumstances, the present invention adopts a double pipe structure for the suction pipe, consisting of an outer pipe connected to the airtight container and an inner pipe into which the refrigerant from the evaporator is introduced. An object of the present invention is to provide a suction pipe device for a hermetic compressor that prevents heat energy from being added to the suction refrigerant as much as possible, eliminates the above-mentioned drawbacks, and improves the volumetric efficiency of the compressor.

An embodiment of the present invention will be described below with reference to FIG.

In the figure, reference numeral 11 denotes a hermetic container of a hermetic compressor, in which an electric element and a compression element (not shown) are housed. Reference numeral 12 denotes a refrigerant suction pipe device interposed between the hermetic compressor and an evaporator (not shown), which has a double pipe structure consisting of an outer pipe 18 and an inner pipe 19.

The outer tube 18 is disposed so as to extend vertically along the side surface of the closed container 11, and its lower end opening is fixed to and connected to the lower side wall of the closed container 11.

The inner pipe 19 is connected to a suction conduit 14 into which refrigerant from an evaporator (not shown) is introduced, but in this embodiment, the tip of the suction conduit 14 is extended as is.

The inner tube 19 is fixedly supported through the inner periphery of a contracted tube section 18A formed by contracting the upper end opening of the outer tube 18, and is extended to the side of the outer tube 18 connected to the closed container 11. The tip opening 19A is open.

Reference numeral 15 denotes a strainer, which is installed in the outer tube 18 below the inner tube tip opening 19A.

According to this configuration, in the suction pipe 12, the refrigerant gas flows in the inner pipe 19, which does not come into contact with the outer pipe 18 except at the contracted end portion 18A, and there are few places where the refrigerant gas flows in contact with the outer pipe 18. Therefore, airtight container 1
The refrigerant gas receives less thermal energy due to the radiant heat from 1 to the outer tube 18. Furthermore, the fixed portion 16 of the outer tube 18 with the airtight container 11 is also attached to the contracted end portion 18A, which is the contact portion between the inner tube 19 and the outer tube 18.
Since the outer tube 1 is far away from the closed container 11,
The amount of thermal energy directly transferred to inner tube 19 is extremely small.

Therefore, of the thermal energy added to the suction pipe 12 from the airtight container 11, only a small amount of the thermal energy is added to the suction refrigerant gas, and most of it is released to the outside air, and as a result, it is possible to suppress the temperature rise of the suction refrigerant gas. , the volumetric efficiency of the compressor increases, and the efficiency of the compressor can be improved.

In the above embodiment, the present invention was applied to a high-pressure shell type compressor, but the same effect can be obtained even if the present invention is applied to a low-pressure shell type compressor.

As explained above, the present invention has a refrigerant suction pipe with a double structure of an outer pipe and an inner pipe, and the refrigerant gas from the evaporator is introduced from the inner pipe side, and the refrigerant gas is introduced into the compressor from the outer pipe side. This allows the heat energy added to the suction refrigerant gas from the sealed container to be minimized, suppressing the temperature rise of the suction refrigerant gas and increasing the volumetric efficiency of the compressor, which in turn enables a high-efficiency compressor. The practical effects obtained are great.

[Brief explanation of the drawing]

Fig. 1 is a front view showing a suction pipe device of a conventional hermetic compressor, Fig. 2 is a vertical sectional view showing details of the same suction pipe device, and Fig. 3 is an example of the suction pipe device according to the present invention. FIG. 11... airtight container, 12... suction tube, 14...
Suction conduit, 18... outer pipe, 19... inner pipe.

Claims (1)

[Claims for Utility Model Registration] (1) In a refrigerant suction pipe device installed in a refrigerant path between an evaporator and a hermetic compressor, the refrigerant suction pipe is connected to a hermetic compressor. an outer tube having an opening at one end connected to the container; and an airtight container within the outer tube, the outer tube being connected to the suction conduit into which refrigerant from the evaporator is introduced, penetrating and supported by the opening at the other end of the outer tube. A suction pipe device for a hermetic compressor, characterized in that it has a double pipe structure with an inner pipe extending and opening on the connection side. (2) Utility model registration claim 1, in which a strainer is provided at the downstream position of the inner tube tip opening in the outer tube.
A suction pipe device for a hermetic compressor as described in .