JPH0118866Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a hermetic rotary compressor, and is particularly aimed at absorbing discharge pulsations, absorbing rapid pressure increases in refrigerant during liquid compression, and further reducing noise.

A conventional rotary compressor is constructed as shown in Fig. 3, and the discharge gas compressed by the compressor is discharged through the discharge hole a.
and is once discharged into the discharge chamber b. This discharge chamber b
has the role of a muffler, reducing the noise of discharged gas and the pulsation of discharge. The discharged gas is discharged from the opening d of the upper lid c into the closed container e. In order to further increase the effect of muffling noise and reducing discharge pulsation, it is necessary to make the volume of the discharge chamber b larger and the area of the opening d smaller.

However, when the upper cover c is provided on the upper part of the upper frame f, there is a limit to the volume that can be provided between it and the electric motor part g.

On the other hand, when the compressor causes liquid compression, the discharge chamber b is also filled with liquid, causing a rapid pressure rise in the discharge chamber b, which may even damage the upper cover c.

In order to prevent this from occurring, the area of the opening d may be increased. However, if the opening d is made large, there arises a drawback that pulsation and noise during steady operation become large.

The present invention solves the above-mentioned conventional drawbacks.
The purpose is to reduce pulsation of discharged gas and noise during steady operation, and to prevent damage to the discharge chamber due to liquid compression by the compressor.

Hereinafter, the present invention will be explained with reference to FIGS. 1 and 2 of the accompanying drawings showing one embodiment thereof.

In the figure, reference numeral 1 denotes an airtight container, in which a rotary compression element 2 is disposed and housed in the lower part of the airtight container 1, and an electric element 3 is arranged and housed in the upper part.
We are in contact with you. The compression element 2 includes a cylinder 6 that forms a compression chamber 5, an upper frame 7 and a lower frame 8 that close the opening of the compression chamber 5, and a piston 9 that rotates eccentrically along the inner surface of the compression chamber 5. It is made up of. Reference numeral 10 denotes a gas discharge hole opened by a discharge valve 11, and an upper lid 12 is fitted to the upper frame 7 so as to surround the discharge hole 10.
A discharge chamber 13 is formed. An opening 14 is formed in the upper lid 12 so that the discharge gas diffused in the discharge chamber 13 is discharged into the closed container 1. A discharge pipe 16 is attached to pass through the closed container 1. Reference numeral 17 denotes a suction pipe that passes through the closed container 1 and has a suction hole 6a in the cylinder 6.
communicated via. 18 is a communication path;
A lubricating oil layer 19 formed by penetrating the upper frame 7, the cylinder 6, and the lower frame 8 and stored in the lower part of the closed container 1 communicates with the discharge chamber 13, thereby providing lubrication. Oil is lubricant level 2
0 has entered the communication path 18.

With the above structure, when the rotating shaft 4 rotates, the piston 9 rotates eccentrically, and the volume change of the compression chamber 5 at this time causes the gas to be compressed to be sucked into the compression chamber 5 via the suction pipe 17. At the same time, it is compressed and passes through the discharge port 10 of the upper frame body 7 to the upper lid 12.
The liquid is discharged into a discharge chamber 13 formed by. In this case, the lubricating oil level 20 in the communication passage 18 formed in the discharge chamber 13 is such that the pressure inside the closed container 1 and the pressure inside the discharge chamber 13 tend to be balanced, and the pressure inside the closed container 1 and the pressure inside the discharge chamber 13 tend to be balanced. It functions to move up and down depending on the pressure difference with the discharge chamber 13.

Therefore, when the compressed gas is discharged into the discharge chamber 13, the discharge chamber is formed up to the lubricating oil level 20 inside the communication passage 18, so that the volume of the discharge chamber 13 is expanded; A greater sound deadening effect can be obtained. In addition, in order to balance the pressure within the sealed container 1 and the discharge chamber 13,
Since the lubricating oil level 20 inside the communication passage 18 rises and falls, the discharge pulsation of the compressed gas due to the opening and closing of the discharge valve 11 is attenuated, and even when the inside of the discharge chamber 13 is filled with liquid refrigerant during liquid compression, the By escaping the liquid refrigerant from the communication path 18, a sudden pressure increase inside the discharge chamber 13 can be prevented.

In this way, the compressed gas sequentially discharged into the discharge chamber 13 is discharged into the closed container 1 from the opening 14 of the upper lid 12, passes through the gap of the electric element 3, and then passes through the discharge pipe 16. Airtight container 1
Extracted outside.

In this embodiment, the communication passage 18 is formed by penetrating the upper frame 7, the cylinder 6, and the lower frame 8 from the discharge chamber 13, but the present invention is not limited to this. A communication path may be formed by joining a pipe to the upper lid 12 that forms the discharge chamber 13 and communicating the discharge chamber 13 and the lubricating oil layer 19. In this way, the communication passage 18 is connected to the cylinder 6.
This is effective in cases where there is no volume to form a large number of communicating passages.

As described above, the present invention stores an electric element in the upper part of a closed container, a rotary compression element and lubricating oil in the lower part, the compression element is a cylinder, the piston rotates eccentrically within the cylinder, and the It is formed from an upper frame body and a lower frame body provided on the upper and lower end surfaces of the cylinder, and a discharge hole is formed in the upper frame body, and the upper frame body is covered with an upper cover, and there is a space between the upper frame body and the upper cover. forming a discharge chamber, and forming an opening in the upper lid to communicate between the inside of the sealed container and the discharge chamber;
Since the compressor is a hermetic rotary compressor in which the compression element is provided with a communication path that communicates the discharge chamber with the lubricating oil layer stored in the lower part of the hermetic container, the volume of the discharge chamber can be expanded and the noise reduction effect can be improved. In addition, in response to the discharge pulsation due to the opening and closing of the discharge valve, the lubricating oil level inside the communication hole rises and falls in an attempt to balance the pressure in the discharge chamber and the pressure inside the closed container, thereby attenuating the discharge pulsation. In addition, the internal volume of the discharge chamber increases in response to the sudden pressure increase during liquid compression, preventing excessive pressure increases. By providing the communication passage, the lubricating oil has a discharge chamber internal volume and pressure adjustment function, and the above-mentioned beneficial effects are obtained.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of a hermetic rotary compressor according to an embodiment of the present invention, Fig. 2 is an enlarged longitudinal sectional view of the same hermetic rotary compressor, and Fig. 3 is a hermetic rotary compressor showing a conventional example. FIG. DESCRIPTION OF SYMBOLS 1... Airtight container, 2... Compression element, 3... Electric element, 6... Cylinder, 7... Upper frame, 8...
Lower frame body, 10... Discharge hole, 12... Upper lid, 13
...Discharge chamber, 14...Opening, 18...Communication path,
19...Lubricating oil layer.

Claims (1)

[Scope of utility model registration request] An electric element is housed in the upper part of a closed container having a discharge pipe in the upper part, and a rotary compression element and lubricating oil are housed in the lower part, and the compression element is a cylinder, a piston that rotates eccentrically within the cylinder, and a piston that rotates eccentrically within the cylinder. It is formed from an upper frame body and a lower frame body provided on the upper and lower end surfaces, and a discharge hole is formed in the upper frame body, and the upper frame body is covered with an upper lid to form a discharge chamber between the upper frame body and the upper lid. an opening is formed in the upper lid to allow communication between the inside of the sealed container and the discharge chamber, and a connection is formed in the compression element to allow communication between the discharge chamber and a lubricating oil layer stored in a lower portion of the closed container. A hermetic rotary compressor with a passage.