JPH0444869Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention relates to an improvement of a hermetic compressor having an integral accumulator.

(b) Conventional technology A conventional hermetic compressor is, for example, the Utility Model Publication No. 49-12249
The structure is as shown in the publication. Here, a conventional example will be explained with reference to this publication. Third
In the figure, 50 is a first sealed container, a frame 51 is press-fitted into this container, a cylinder 52 of a compression mechanism is fixed to the lower part of this frame, and a lower lid 53 is fixed to the lower part of this cylinder. At the same time, a rotating body 55 is provided on the roller 54 of the cylinder 52, a motor rotor 57 is attached to the upper part of a shaft 56 to which this rotating body is attached at the bottom, and a motor stator 58 is arranged around the motor rotor. It is press-fitted and fixed into the airtight container 50 of No. 1.

The first hermetic container 50 in which the compression mechanism and motor are installed is inserted into the second hermetic container 59,
It is supported via upper and lower buffer bodies 60 and 61.

Then, the cylinder 52 inside the first closed container 50
A suction pipe 62 is horizontally protruded and opened into the second closed container 59 from the opening, and an ejector pipe extending to the bottom of the second closed container 59 is located slightly inward from the opening at the tip of the suction pipe. 63 are provided.

A suction pipe 64 from the evaporator is connected to the upper part of the second closed container 59, and a discharge pipe 65 made of a flexible tube or the like is connected to the upper part of the first closed container 50. is wound around the upper part of the first closed container 50 and led out to the outside of the second closed container 59.

66 is the terminal, 67 is the first closed container 50
It is an oil reservoir that stores oil at the bottom of the tank.

In a hermetic compressor with this structure, the first hermetic container 5
A refrigerant is made to flow into the space 68 formed between the first hermetic container 50 and the second hermetic container 59 from the suction pipe 64, and the refrigerant that has flowed in cools the compression mechanism and the motor in the first hermetic container 50. The oil and the like contained in this refrigerant are collected at the bottom of the second closed container 59 and separated into gas and liquid, so that the oil and liquid refrigerant are not directly sucked into the compression mechanism.

(c) Problems to be solved by the invention However, since the second hermetic container 59 encloses the first hermetic container 50, the oil and liquid refrigerant accumulated in the second hermetic container may be used to remove the first airtight container. The oil stored in the oil reservoir 67 of the sealed container 50 is supercooled and forms during startup, causing the first
There was a problem that the oil in the oil reservoir 67 in the sealed container 50 was discharged.

In order to solve the above-mentioned problem, this invention includes a second sealed container that forms an annular space around the first sealed container that houses the electric element and the compression element, and extends over the electric element and the compression element. The annular space is located above the oil reservoir in the first sealed container, and the refrigerant and oil flowing into the annular space cool the electric element and the compression element, and the oil stored in the oil reservoir in the first sealed container cools the electric element and the compression element. The purpose of this is to prevent the oil from being overcooled.

(d) Means for solving the problem This invention provides a second sealed container that forms an annular space around the outer periphery of the first sealed container that houses the electric element and the compression element, and this annular space is connected to the first sealed container. located above the oil sump and within the annular space.
A communication passage communicating with the suction passage of the compression element is provided in the outer wall of the closed container, and the open end of the communication passage opens above the annular space and is provided on the substantially opposite side of the suction pipe.

(e) Effect This device is constructed as described above, so that
An annular space is formed around the outer periphery of the first hermetic container with a second hermetic container, and this annular space prevents oil or liquid refrigerant from directly flowing into the compression element, and the oil or refrigerant in the annular space flows into the first hermetic container. The electric element and compression element inside the annular space are cooled, and the oil stored in the oil reservoir of the first closed container is prevented from being cooled by the oil and liquid refrigerant collected at the bottom of the annular space.

(F) Example This invention will be explained below based on the example shown in FIGS. 1 and 2.

Reference numeral 1 denotes a first closed container having an oil reservoir 2 in which oil is stored at the bottom, and this container is attached to a bottomed cylindrical case 4 having a flange portion 3 at the open end, and to the outer edge of the flange portion 3 of this cylindrical case. Lid body 5
It is made up of. Inside the bottomed cylindrical case 4, an electric element 6 is housed on the upper side, and a rotary compression element 8 driven by a rotating shaft 7 of the electric element is housed on the lower side. The electric element 6 is composed of a stator 9 fixed to the inner wall of the bottomed cylindrical case 4, and a rotor 11 inserted into the rotating shaft 7 through an air gap 10 inside the stator. Rotary compression element 8
includes a cylinder 12, a roller 14 that rotates within the cylinder 12 by an eccentric portion 13 of the rotating shaft 7, an upper bearing portion 15 and a lower bearing portion 16 that close the opening of the cylinder 12, and a roller 14 that is attached to the upper bearing portion. Discharge valve 17
and a cup muffler 18 that covers this discharge valve. Reference numeral 19 denotes a second sealed container provided on the outer periphery of the bottomed cylindrical case 4 forming the first sealed container 1;
An annular space 20 is formed extending from the lower end of the flange portion 3 to the electric element 6 and the rotary compression element 8.
This annular space is formed above the oil reservoir 2 of the first closed container 1. Reference numeral 21 denotes a communication passage that communicates with a suction passage 22 provided in the cylinder 12, and this communication passage is formed by closely adhering a plate member 23 having a U-shaped cross section to the outer wall of the first sealed container 1 within the annular space 20. There is. The open end 24 of the communication path 21 opens above the annular space 20 . A small hole 25 for oil return is bored in the lower part of the plate member 23 forming the communication path 21. 26 is a suction pipe attached to the second closed container 19 so as to open into the annular space 20;
This suction pipe is provided on the opposite side of the open end 24 of the communication channel 21.

Reference numeral 27 denotes an oil separation plate provided in the upper space 28 of the electric element 6 formed by the lid 5, and this oil separation plate is provided facing the air gap 10 of the electric element 6. 29 is a discharge pipe, and this discharge pipe is attached to the center of the lid body 5 so as to open into the upper space 28.

In the hermetic compressor configured in this way,
The refrigerant flowing into the cylinder 12 from the suction passage 22 is compressed by the roller 14, opens the discharge valve 17, and is discharged into the cup muffler 18. The refrigerant in this cup muffler is discharged into the upper space 28 through the air gap 10 of the electric element 6. The refrigerant discharged into the upper space collides with the oil separation plate 27 to separate the oil contained therein. Most of the oil-separated refrigerant is discharged from the discharge pipe 29 to an external cooling circuit (not shown).
The refrigerant that has circulated through this external cooling circuit and returned flows into the annular space 20 from the suction pipe 26, where oil and liquid refrigerant are separated and gas refrigerant is sucked in from the open end 24 of the communication path 21. It flows into the passage 22. Further, the separated oil and liquid refrigerant are stored at the bottom of the annular space 20. The oil and liquid refrigerant accumulated in this annular space are returned to the suction passage 22 through the small holes 25 of the plate member 23 forming the communication passage 21.

The electric element 6 and the rotary compression element 8 housed in the first closed container 1 are cooled by the low-temperature refrigerant flowing into the annular space 20 . Therefore, the electric element 6
The temperature of the rotary compressor element 8 and the rotary compressor element 8 are kept from rising abnormally to prevent the rotary compressor from burning out or seizing due to wear and becoming inoperable. Further, the electric element 6 and the rotary compression element 8 are covered with a double wall of the first sealed container 1 and the second sealed container 19, making it difficult for vibrations and noise to be transmitted to the outside.

Further, the annular space 20 is formed above the oil reservoir 2 of the first closed container 1, and prevents the oil stored in this oil reservoir from being cooled by the low-temperature refrigerant in the annular space 20. Liquid refrigerant stays in the oil to prevent forming during startup.

Open end 24 of plate member 23 forming communication path 21
is provided on the opposite side of the suction pipe 26 so as to be far away from the suction pipe to prevent oil and liquid refrigerant contained in the refrigerant flowing from the suction pipe 20 from directly entering into the annular space 20. ing.

(g) Effects of the invention The hermetic compressor of this invention is provided with a second hermetic container that forms an annular space around the outer periphery of the first hermetic container that houses an electric element and a compression element, and a compressor that is formed by the second hermetic container. An annular space is located above the oil reservoir of the first sealed container, and a communication path communicating with the suction passage of the compression element is provided on the outer wall of the first sealed container within the annular space, and an open end of the communication path is provided. Since it opens above the annular space and is provided on the substantially opposite side of the suction pipe, it has the following effects.

The electric element and the compression element can be cooled by the refrigerant flowing into the annular space.

Oil and liquid refrigerant contained in the refrigerant flowing into the annular space from the suction pipe can be prevented from being directly sucked into the open end of the communication path.

The oil stored in the oil reservoir of the first closed container is not cooled by the refrigerant in the annular space, and it is possible to prevent the liquid refrigerant from sleeping in the oil and causing forming upon startup.

[Brief explanation of the drawing]

Figures 1 and 2 show this invention, with Figure 1 being a longitudinal sectional view of the rotary compressor, and Figure 2 being the same as in Figure 1.
A line sectional view and FIG. 3 are vertical sectional views of a rotary compressor showing a conventional example. 1...First airtight container, 2...Oil reservoir, 6...
Electric element, 8... Rotating compression element, 19... Second sealed container, 20... Annular space, 21... Communication path, 2
2... Suction passage, 24... Open end, 26... Suction pipe.

Claims (1)

[Scope of utility model registration request] The electric element and the compression element are housed in a first sealed container having an oil reservoir at the bottom;
In the hermetic compressor, the hermetic compressor is provided with a second hermetic container that forms an annular space on the outer periphery of the first hermetic container over the electric element and the compression element, and has a suction pipe that opens into the annular space. The annular space is provided above the oil reservoir of the first closed container, and a communication path communicating with the suction path of the compression element is provided on the outer wall of the first closed container within the annular space, and the open end of the communication path is provided. opens above the annular space, and
A hermetic compressor characterized by being installed on the substantially opposite side of a suction pipe.