JPH09236092A - Enclosed compressor for refrigerating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the specific volume of refrigerant gas sucked in a compressor by branching off a suction pipe of the refrigerant gas into two parts, connecting one to a compression mechanism after the refrigerant gas cools a motor, and connecting the other to a sealed housing in a position where the refrigerant gas is directly introduced to the compression mechanism, respectively. SOLUTION: A suction pipe of refrigerant gas is branched off into two parts, and its one 82 is connected to a position where the refrigerant gas is introduced to a compression mechanism C after cooling a motor M, that is, a lower part of a closed housing 8, and the other 90 is connected to a position where the refrigerant gas is directly introduced to the compression mechanism C, that is, a middle stage of the closed housing 8. However, a part of the refrigerant gas evaporated and gasified by an evaporator 86 is sucked in the closed housing 8 from a suction pipe 82, and is sucked in the compression mechanism C after cooling the motor M, but most of the refrigerant gas is sucked in the closed housing 8 from a suction pipe 90, and is directly sucked in the compression mechanism C. Therefore, a circulating quantity of a circulating refrigerant is increased, and capacity of a refrigerating device can be improved.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a hermetic compressor for a refrigeration system.

[0002]

2. Description of the Related Art FIG. 3 shows an example of a conventional compressor of this type. Inside the hermetic housing 8, a scroll type compression mechanism C is arranged at an upper part thereof, and a drive motor M is arranged at a lower part thereof, which are interlockingly connected to each other via a rotary shaft 5.

The scroll compression mechanism C comprises a fixed scroll 1 and an orbiting scroll 2. The fixed scroll 1 includes an end plate 11 and a spiral wrap 12 provided upright on the inner surface of the end plate 11.
The end plate 11 is provided with a discharge port 13 and a check valve 17 for opening and closing the discharge port 13.

The fixed scroll 1 and the drive motor M are fastened to a frame 6, and the rotary shaft 5 is supported by an upper bearing 71 and a lower bearing 72.

The orbiting scroll 2 is provided with an end plate 21 and a spiral wrap 22 which is erected on the inner surface of the end plate 21, and a drive bush 54 is provided in the orbiting bearing in a boss 23 which is erected on the outer surface of the end plate 21.
This drive bush is rotatably fitted through 73.
An eccentric pin 53 projecting from the upper end of the rotary shaft 5 is slidably fitted in a slide hole 55 formed in 54. The orbiting scroll 2 is supported by the frame 6 via a thrust bearing 74, and a balance weight 84 is attached to the drive bush 54.

A plurality of compression chambers 24 are formed by making the fixed scroll 1 and the orbiting scroll 2 eccentric to each other by a predetermined distance and engaging with each other while shifting the angle by 180 °.

By driving the drive motor M, the rotary shaft 5, the eccentric pin 53, the drive bush 54, and the boss 23.
The orbiting scroll 2 is driven via the orbit, and the orbiting scroll 2 revolves in a circular orbit having a revolving orbital radius while being prevented from rotating by the rotation preventing mechanism 3.

Then, the refrigerant gas is sucked into the closed housing 8 through the suction pipe 82 to cool the drive motor M, and
It is sucked into the compression chamber 24 of the compression mechanism C via the suction passage 15. Then, as the volume of the compression chamber 24 decreases due to the orbiting movement of the orbiting scroll 2, the compression chamber 24 is compressed and reaches the central portion, and the check valve 17 is pushed open from the discharge port 13 to the first position.
Into the second discharge cavity 19 through the communication hole 18 formed in the partition plate 25, and then discharged through the discharge pipe 83.

At the same time, the lubricating oil stored in the oil sump 81 at the bottom of the closed housing 8 is sucked up by the centrifugal pump 51 and passes through the oil supply hole 52 formed in the rotary shaft 5 to the lower bearing 72 and the eccentric pin. After lubricating the sliding parts such as 53, the upper bearing 71, the rotation preventing mechanism 3, the swivel bearing 73, the thrust bearing 74, etc., they return to the oil reservoir 81 through the chamber 61 and the oil drain hole 62, and are stored there.

The gas refrigerant discharged from the discharge pipe 83 is a condenser
After entering 84 and condensing here, it is adiabatically expanded by here and is throttled by the expansion valve 85. Then, after being evaporated by the evaporator 86, it is sucked into the closed housing 8 through the suction pipe 82.

A part of the liquid refrigerant condensed and liquefied by the condenser 84 is a liquid injection circuit 87 and a liquid injection valve interposed therein.
88, returning to the compressor through the capillary tube 89, and from the liquid passage 31 formed in the end plate 11 of the fixed scroll 1 to the compression chamber.
It is injected into 24 to cool the compression chamber 24.

[0012]

In the above conventional compressor, the refrigerant gas sucked into the hermetically sealed housing 8 is sucked into the compression mechanism C in a state where the specific volume of the refrigerant gas is increased by cooling the drive motor M. Therefore, there is a problem that the circulation amount of the refrigerant circulating in the refrigerating apparatus is reduced and the refrigerating capacity is lowered.

[0013]

SUMMARY OF THE INVENTION The present invention has been invented to solve the above problems, and its gist is to provide a refrigerant gas in a hermetically sealed housing containing a compression mechanism and its drive motor. In a hermetic compressor for a refrigerating device, which is sucked and sucked into the compression mechanism, a refrigerant gas suction pipe is branched into two, and one of them is guided to the compression mechanism after cooling the motor. In the closed position, the other is connected to the closed housing at a position where the refrigerant gas is directly guided to the compression mechanism.

Thus, one of the branched refrigerant gases is introduced into the compression mechanism after cooling the motor, and the other is directly introduced into the compression mechanism.

The gist of the second invention is that the refrigerant gas is sucked into the hermetically-sealed housing containing the compression mechanism and its drive motor to be sucked into the compression mechanism, and at the same time, the liquid refrigerant is stored in the compression chamber of the compression mechanism. In a hermetic compressor for a refrigerating machine having a liquid injection circuit for injecting a part, a suction pipe for a refrigerant gas is connected to the hermetic housing at a position where the refrigerant gas is directly guided to the compression mechanism, and the liquid injection circuit is connected to the hermetic housing. A hermetic compressor for a refrigerating machine, characterized in that it is branched and one of them is connected to a position where a liquid refrigerant is injected toward the motor.

Thus, the refrigerant gas is directly guided to the compression mechanism, and a part of the liquid refrigerant is injected toward the motor to cool it.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention is shown in FIG. The refrigerant gas suction pipe is branched into two, one of which is connected to the position where the compression mechanism C is guided after the refrigerant gas cools the motor M, that is, the lower part of the hermetic housing 8, and the other 90 is the refrigerant gas. Is directly connected to the compression mechanism C, that is, the middle stage of the closed housing 8. Other configurations are the same as those of the conventional one shown in FIG. 3, and corresponding members are designated by the same reference numerals and the description thereof will be omitted.

Thus, a part of the refrigerant gas evaporated and vaporized in the evaporator 86 is sucked into the closed housing 8 through the suction pipe 82, cools the motor M, and is then sucked into the compression mechanism C. Portion from suction pipe 90 to closed housing 8
It is sucked inside and directly sucked into the compression mechanism C. Therefore, the specific volume of the refrigerant gas sucked into the compression mechanism C becomes smaller than that of the conventional one, and the circulation amount of the refrigerant circulating in the refrigeration apparatus increases, so that the capacity of the refrigeration apparatus is improved.

A second embodiment of the present invention is shown in FIG. In the second embodiment, the suction pipe 90 is connected to a position where the refrigerant gas is directly guided to the compression mechanism C, that is, the middle stage of the closed housing 8.

A plurality of liquid injection circuits 87 are provided.
(3 in the figure), one of the branch pipes communicates with the compression chamber 24 of the compression mechanism C as in the conventional one, but the other 2
91 and 92 are connected to a position where the liquid refrigerant is sprayed toward the motor M, that is, the closed housing 8 around the motor M. The other configuration is the same as that of the conventional one shown in FIG. 3, and the corresponding members are denoted by the same reference numerals and description thereof will be omitted.

Then, a part of the liquid refrigerant condensed and liquefied in the condenser 84 is injected into the motor M through the branch pipes 91 and 92 to cool it. Since the refrigerant gas evaporated and vaporized in the evaporator 86 enters the closed housing 8 from the suction pipe 90 and is directly guided to the compression mechanism C, its specific volume becomes smaller than that of the conventional one, and the refrigerant gas circulates in the refrigeration system. As the volume increases, the capacity of the refrigeration system improves.

[0022]

In the first aspect of the present invention, a part of the branched refrigerant gas is introduced into the compression mechanism after cooling the motor, but most of the branched refrigerant gas is directly introduced into the compression mechanism and is thus sucked into the compression mechanism. Since the specific volume of the refrigerant gas becomes smaller than that in the conventional case and the circulation amount of the refrigerant circulating in the refrigeration system increases, the capacity of the refrigeration system can be improved.

In the second aspect of the invention, since a part of the liquid refrigerant is injected toward the motor to cool it, it is not necessary to cool the motor with the refrigerant gas. Therefore,
The refrigerant gas can be guided directly to the compression mechanism, which results in
Since the specific volume of the refrigerant gas sucked into the compressor can be made smaller than that in the conventional case, the circulation amount of the refrigerant circulating in the refrigerating apparatus is increased and the capacity of the refrigerating apparatus is improved.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view showing a second embodiment of the present invention.

FIG. 3 is a vertical sectional view of a conventional hermetic compressor for a refrigeration system.

[Explanation of symbols]

 8 Closed housing C Compression mechanism 24 Compression chamber M Motor 82, 90 Refrigerant gas suction pipe 87 Liquid injection circuit 84 Condenser 85 Expansion valve 86 Evaporator

Claims (2)

[Claims] 1. A hermetic compressor for a refrigerating device, wherein a refrigerant gas is sucked into a hermetically sealed housing containing a compression mechanism and a drive motor thereof to be sucked into the compression mechanism, and two refrigerant gas suction pipes are provided. And one of them is connected to the hermetic housing at a position where the refrigerant gas is guided to the compression mechanism after cooling the motor, and the other is connected to the hermetic housing at a position where the refrigerant gas is directly guided to the compression mechanism. Closed type compressor for refrigeration equipment. 2. A liquid injection circuit for injecting a refrigerant gas into a hermetically-sealed housing containing a compression mechanism and a drive motor for causing the gas to be sucked into the compression mechanism and for injecting a part of the liquid refrigerant into a compression chamber of the compression mechanism. In the hermetic compressor for a refrigerating device provided, the refrigerant gas suction pipe is connected to the hermetic housing at a position where the refrigerant gas is directly guided to the compression mechanism, and the liquid injection circuit is branched so that one of the liquid refrigerant is A hermetic compressor for a refrigeration apparatus, characterized in that the hermetic compressor is connected to a position where it is injected toward the motor.