JPH04353276A - Suction device of sealed compressor - Google Patents

Abstract

PURPOSE:To suppress temperature rise and pulsation of refrigerant in a suction pipe for supplying refrigerant to a cylinder. CONSTITUTION:A suction pipe 18 penerates through the wall of a sealed vessel 1 and thus is fixed to a suction port 19 of a cylinder 8. In the suction pipe, there is provided a space 20 between the sealed vessel and the cylinder, being immersed within oil. The space is coverted with a heat insulator 21. Accordingly, temperature rise and pulsation of refrigerant are suppressed, thereby enhancing the refrigeration performance.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a suction device for a hermetic compressor.

0002

[Prior Art] A conventional hermetic compressor is, for example,
It is configured as shown in Japanese Patent No. 29995. Here, a conventional example will be explained with reference to this publication. Figure 3
In FIG. 4, 50 is a closed container, and inside this container is a rotary compression element 5 driven by an electric element (not shown).
1 is stored. This rotary compression element is a closed container 50
A frame body 53 having a bearing 52 press-fitted therein, a cylinder 56 fixed to the frame body with a bolt 54 and having a compression chamber 55 therein, and a rotating shaft 5 pivotally supported by the bearing 52.
A roller 59 is inserted into the eccentric portion 58 of No. 7 and rotates inside the compression chamber 55, and the other end is biased by a spring 60 so that the tip of this roller comes into pressure contact with the inside of the compression chamber 55 to a low pressure side and a high pressure side. It is configured by partitioning vanes 61. Reference numeral 62 designates a cup body attached to the outer periphery of the lower part of the cylinder 56, and a discharge silencing chamber (not shown) is formed inside thereof. 63 is oil stored at the bottom of the closed container 50.

Reference numeral 64 denotes a suction pipe inserted through a sleeve 65 provided on the side wall of the closed container 50, and this suction pipe is connected to the cylinder 56.
It is press-fitted into the suction hole 66 through a tapered heat insulating pipe 67 connected to the end of the suction hole 66 provided in the.

In the suction device of the hermetic compressor having this structure, the suction pipe 64 is insulated with a heat insulating pipe 67 to prevent the refrigerant flowing through the suction pipe from being heated.

[0005]

However, since the suction pipes 64 are formed of pipes having approximately the same diameter, the compression chamber 55
When the suction hole 66 is opened and closed by the inner roller 59, the refrigerant pulsates, and the amount of refrigerant sucked into the compression chamber decreases, causing a problem that the refrigerating capacity decreases.

[0006] This invention solves the above problems.
It is an object of the present invention to provide a suction device for a hermetic compressor that prevents heating of refrigerant while preventing pulsation within a suction pipe.

[0007]

[Means for Solving the Problems] The present invention includes a closed container having an oil reservoir at the bottom, an upper electric element housed within the container, and a lower compression element driven by the electric element. , the compression element is composed of a cylinder, a roller rotated within the cylinder by an eccentric part of a rotating shaft, and a suction pipe that passes through the sealed container and supplies refrigerant into the cylinder, and the suction pipe is sealed. The suction pipe is immersed in oil in a container, and a space covered with a heat insulating material is formed in the suction pipe immersed in the oil.

[0008]

[Operation] This invention is configured as described above, so that
A space covered with a heat insulating material is formed in a suction pipe immersed in oil to suppress the pulsation and heating of the refrigerant sucked into the cylinder through this suction pipe, thereby improving the refrigerating capacity.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below based on the embodiments shown in FIGS. 1 and 2.

Reference numeral 1 denotes a closed container having an oil reservoir 2 at the bottom. Inside this container, an electric element 3 is housed on the upper side, and a rotary compression element 4 driven by the electric element is housed on the lower side. The electric element 3 is composed of a stator 5 fixed to the inner wall of the closed container 1, and a rotor 7 having a rotating shaft 6 inside the stator.

The rotary compression element 4 includes a cylinder 8 and a rotating shaft 6.
a roller 10 rotated along the inner wall of the cylinder 8 by an eccentric portion 9; and an upper bearing 1 that seals the opening of the cylinder 8.
1, a lower bearing 12, and a cup muffler 13 attached to the upper bearing.

The upper bearing 11 is provided with a flange 14 that is fixed to the inner wall of the closed container 1. The cylinder 8 is fixed to the upper bearing 11 with a bolt 5 with a gap provided between the cylinder 8 and the inner wall of the closed container 1. The upper bearing 11 is provided with a discharge hole 16 that communicates between the inside of the cylinder 8 and the inside of the cup muffler 13, and this discharge hole is opened and closed by a discharge valve 17.

Reference numeral 18 denotes a suction pipe that passes through the sealed container 1 and is attached to the suction hole 19 of the cylinder 8. In this suction pipe, a space 20 with a large volume is provided in the gap between the sealed container 1 and the cylinder 8, and an oil reservoir 2 is provided. It is immersed in oil. Further, the space 20 is insulated by covering the inside with a heat insulating material 21.

Reference numeral 22 denotes a discharge pipe attached to the upper wall of the closed container 1.

In the suction device of the hermetic compressor constructed as described above, the refrigerant flowing into the cylinder 8 from the suction pipe 18 through the suction hole 19 is compressed by the roller 10, and is discharged by opening the discharge valve 17. Cup muffler 1 from hole 16
It is discharged within 3 minutes. The refrigerant in this cup muffler passes between the stator 5 and rotor 7 of the electric element 3 and is discharged from the discharge pipe 22 to the outside of the closed container 1.

The suction pipe 18 that introduces the refrigerant into the cylinder 8 is compressed within the cylinder 8 by providing a space 20 immersed in oil and covered with a heat insulating material 21 in the gap between the closed container 1 and the cylinder 8. The amount of refrigerant flowing into the cylinder 8 is kept at a low temperature by absorbing the pulsation of the suction refrigerant gas in the space 20 and keeping the amount of refrigerant flowing into the cylinder 8 at a low temperature.
We are trying to increase the freezing capacity by increasing the amount.

By immersing the space 20 of the suction pipe 18 in the oil in the oil reservoir 2, the vibration energy is attenuated by the viscosity of the oil, and the kinetic energy of the suction refrigerant gas is reduced along with the absorption of pulsation due to the volume effect. ing.

This invention prevents the refrigerant flowing into the cylinder 8 from being heated by high-temperature gas by providing a space 20 covered with a heat insulating material 21 in the suction pipe 18 between the closed container 1 and the cylinder 8. At the same time, the pulsation of the suction refrigerant gas is absorbed to prevent the amount of refrigerant supplied into the cylinder 8 from decreasing.

[0019]

As described above, according to the present invention, there is provided a closed container having an oil reservoir at the bottom, an upper electric element housed in the container, and a lower compression element driven by the electric element. a cylinder, the compression element being a cylinder, and a roller rotated within the cylinder by an eccentric portion of the rotating shaft;
and a suction pipe that passes through the sealed container to supply refrigerant into the cylinder, the suction pipe is immersed in oil within the sealed container, and the suction pipe immersed in the oil is covered with a heat insulating material. Since the space is formed, it is possible to suppress the temperature rise of the suction refrigerant gas flowing into the cylinder from the suction pipe, absorb the pulsation of this refrigerant gas, and increase the amount of refrigerant suction, thereby improving the refrigerating capacity.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a rotary compressor showing an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of the main parts of the rotary compressor of the present invention.

FIG. 3 is a vertical sectional view of a main part of a conventional rotary compressor.

FIG. 4 is a cross-sectional view of a main part of a conventional rotary compressor.

[Explanation of symbols]

1　Airtight container 2 Oil reservoir 3　Electric element 4 Rotating compression element 6 Rotation axis 8 Cylinder 9 Eccentric part 10 Roller 18 Suction pipe 20 Space 21 Insulation material

Claims (1)

[Claims] [Claim 1] A closed container having an oil reservoir at the bottom;
The container includes an upper electric element housed in the container and a lower compression element driven by the electric element, the compression element including a cylinder and a roller rotated by an eccentric part of a rotating shaft in the cylinder. and a suction pipe that passes through the sealed container and supplies refrigerant into the cylinder, wherein the suction pipe is immersed in oil within the sealed container, and the suction pipe is immersed in the oil. A suction device for a hermetic compressor, characterized in that a space covered with a heat insulating material is formed.