JPS6040876Y2 - Hermetic electric compressor - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improved structure of a hermetic electric compressor.

Conventionally, in this type of compressor, return gas flows into a sealed container from the suction pipe, is temporarily stored, and then enters the suction muffler. During this storage, the gas is heated by the heat generated by the electric compressor. This has the disadvantage that the volumetric efficiency is lowered, and the temperature of the compressed gas also increases, which accelerates the deterioration of the lubricating oil and adversely affects other components.

Furthermore, a deflection plate was provided opposite the opening of the suction pipe, which required time and effort to manufacture.

This proposal has been made in view of the above points, and the embodiment shown in the drawings will be described below.

Reference numeral 1 denotes a closed container in which lubricating oil 2 is stored at the bottom, and an electric compressor body 4 is arranged and housed within the container via an elastic support device 3.

The electric compressor body 4 is constructed by arranging an electric element 5 above and a compression element 6 below.

The compression element 6 includes a cylinder 8 integrated with a support frame 7, a piston 11 connected to an eccentric portion 10 of a crankshaft 9 and sliding in the cylinder 8, and an intake valve that is opened and closed by valve plates 12 and 13, respectively. The cylinder head 17 is attached to the open end of the cylinder 8 via a valve seat plate 16 having a hole 14 and a discharge hole 15.

The cylinder head 17 forms a suction chamber 18 and a discharge chamber 19, and above the suction chamber 18, a suction muffler 20 located on the side of the electric element 5 is integrally formed.

This suction muffler 20 has an inclined surface 24 which faces the opening of the suction pipe 21 in the container 1 and is inclined at an obtuse angle with respect to the axis of the outlet of the suction pipe, and a downstream surface of the gas. The muffler 20 has a suction port 22 formed therein.
It is configured such that the gas flowing therein passes through the inner wall surface of the inclined surface 24.

23 is a plurality of protrusions provided on the inclined surface 24 upstream of the suction port 22.

Note that a porous member may be provided in place of the projection 23.

In the above configuration, the gas that has flowed into the closed container 1 through the suction pipe 21 is applied to the slope 24 of the suction muffler 20 to cool the muffler 20, and then becomes slightly heated and tilted. The gas flows along the downstream sloped surface 24.
It is introduced into the muffler 20 through a suction port 22 formed in the muffler 20 .

The gas introduced into the muffler 20 flows to the cylinder head 17 through the communication hole 25 serving as a discharge port, but on the way, it passes through the inner wall surface of the inclined surface 24 facing the opening of the suction pipe 21. Therefore, the gas passing through this inner wall continues to flow into the suction pipe 2.
1 and is cooled again by the gas that is applied to the inclined surface 24.

Therefore, the gas introduced into the silencer 20 is
1 into the container 1, the temperature becomes as low as the temperature when it is introduced into the container 1 through the communication hole 25 and the suction chamber 18 of the cylinder head 17.
It flows into the cylinder 8 through the.

Thereby, the temperature of the gas flowing into the cylinder 8 can be lowered, and the volumetric efficiency can also be improved.

Further, since the temperature of the discharged gas after compression is kept low, the deterioration of the lubricating oil is not accelerated and other components are not adversely affected.

Furthermore, if the suction gas contains a liquid that does not vaporize, it hits the protrusion 23 and falls downward to cool the cylinder head 17, so troubles such as damage to the valve due to liquid compression do not occur.

Furthermore, since the inclined surface 24 guides the gas, there is no need to provide a separate deflection plate, and the number of parts is small and manufacturing is easy.

As mentioned above, the hermetic electric compressor according to the present invention has the electric compressor main body, which is composed of an electric element and a compression element, housed in a hermetic container, and has a suction pipe fixed inside the hermetic container. In the hermetic electric compressor in which the compression element includes a suction muffler having a suction port and a discharge port, the suction muffler has an inclined surface inclined at an obtuse angle with respect to an axis of an outlet portion of the suction pipe. , and the suction port is formed in the wall of the muffler on the downstream side of the gas sucked into the container, and the slope of the part of the slope of the muffler that faces the opening of the suction pipe is Since the inner wall is configured to be a part of the gas passage flowing from the suction port to the discharge port,
The gas that has flowed into the sealed container through the suction pipe is applied to the slope of the suction muffler to cool the muffler, and the gas slightly heated by this cooling is guided to the suction port along the slope to form the muffler. The introduced gas can be cooled again by the gas that is continuously applied to the inclined surface, and the temperature of the gas flowing into the cylinder can be maintained low.

This improves the compression efficiency of the compressor, reduces deterioration of the lubricating oil, and facilitates production, which is beneficial in practical terms.

[Brief explanation of the drawing]

Figure 1 is a longitudinal sectional view of the hermetic electric compressor according to the present invention, Figure 2
The figure is an enlarged view of the main part of Fig. 1, and Fig. 3 is a slope view of the main part. 1... Sealed container, 4... Electric compressor body, 17... Cylinder head, 20... Suction muffler, 21... Suction pipe, 22... Suction port, 24... Inclined surface.

Claims (1)

[Claims for Utility Model Registration] 1. An electric compressor main body consisting of an electric element and a compression element is housed in a closed container, and a suction pipe is fixed to the closed container, and the compression element is connected to the compressor. In a hermetic electric compressor equipped with a suction muffler having a suction port and a discharge port, the suction muffler has an inclined surface inclined at an obtuse angle with respect to the axis of the outlet portion of the suction pipe, and The suction port is formed in the wall of the silencer on the downstream side of the gas sucked into the container, and the slope of the part of the slope of the silencer that faces the opening of the suction pipe has an inner wall that A hermetic electric compressor characterized in that it is configured to be part of a gas passageway that flows from the mouth to the discharge port. 2. The hermetic electric compressor according to claim 1, which is a registered utility model, characterized in that a wall surface upstream of the suction port is provided with a protrusion that intersects with the gas flow.