JPH06346851A - Hermetic compressor - Google Patents

Abstract

PURPOSE:To prevent coolant from flowing into a compression element, reduce an amount of cooling medium gas suctioned into a closed container, and prevent temperature rise of the cooling medium gas caused by direct transmission of heat of lubricating gas to a suction pipe. CONSTITUTION:An intake pipe 5 is communicated with outside of a closed container 1. A first branch pipe 6 is communicated with a intake muffler 11. A tank 7 which has a sectional area larger than that of an intake passage 5 is arranged between the intake pipe 5 and the branch pipe 6. A coolant discharge passage of an N-character shape whose one end is opened inside the closed container 1 is arranged on a lower position of the tank 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic compressor used in refrigerators, air conditioners, etc.
Particularly, it relates to a suction pipe in a closed container.

[0002]

2. Description of the Related Art In recent years, a hermetic compressor (hereinafter referred to as "compressor") is required to have high energy efficiency, and there is a direct suction system as a suction system for that purpose. As this prior art, for example, Japanese Utility Model Laid-Open No. 52-170307
It is shown in the publication.

An example of the above-mentioned conventional inhalation system will be described below with reference to the drawings. FIG. 8 is a vertical sectional view of a conventional compressor. Reference numeral 1 is a closed container, 2 is a compression element elastically supported in the closed container 1, 3 is an electric element disposed above the compression element 2, and 4 is a cylinder head constituting the compression element 2. Reference numeral 9 is an insertion tube, and 11 is a suction muffler into which the insertion tube 9 is inserted.

Reference numeral 12 is a lubricating oil, 13 is an oil capillary having one end opened in the suction muffler and the other end is opened in the lubricating oil 12, 14 is a steel strip having a spring property, and 15 is a suction muffler 11 and the oil capillary 13. At the same time, it is a fixing bolt for fixing through the steel strip 14 having a spring property.

Reference numeral 24 denotes a suction pipe that is branched into a plurality of parts in the closed container 1, and one branch end 24a communicates with the compression element 2.
One branch end 24 b communicates with the outside of the closed container 1, and one branch end 24 c opens into the space inside the closed container 1.

Regarding the compressor configured as described above,
The operation will be described below. Refrigerant gas from the external cooling circuit (not shown) enters the compression element 2 driven by the electric element 3 from the branch end 24b of the suction pipe 24, and the branch end 24
a, It is sucked into the suction muffler 11 through the insertion tube 9. This refrigerant gas is introduced into the cylinder head 4 and then introduced into the compression element 2 and compressed.

A part of the refrigerant gas sucked from the branch end 24b of the suction pipe 24 is discharged into the closed container 1 from one branch end 24c of the suction pipe 24 to cool the electric element 3 etc. We are trying to improve the sex. Further, when the liquid refrigerant is sucked from the suction pipe 24, it is opened in the closed container 1 space so as to discharge the liquid refrigerant from one branch end 24 of the suction pipe 24.

[0008]

However, in the above-mentioned conventional structure, since one branch end of the suction pipe is opened to the space inside the closed container, a part of the heated and expanded refrigerant gas inside the closed container space is partially discharged. It is sucked into the suction pipe. Further, if the opening end of the branch pipe is narrowed in order to reduce the suction of the heated and expanded refrigerant gas in the closed container into the suction pipe, there is a problem that it becomes difficult to discharge the liquid refrigerant from the branch pipe. It was In addition, if a branch pipe opened to the space inside the closed container is opened in the lubricating oil to prevent the refrigerant gas that is heated and expanded in the closed container from being sucked in, the suction pipe is directly drawn from the branch pipe opened in the lubricating oil. There is a problem that the heat of the lubricating oil is transferred to the suction pipe to heat it and the temperature of the refrigerant gas rises.

The present invention solves the above-mentioned conventional problems, and an object thereof is to reliably discharge the liquid refrigerant from the suction pipe into the closed container without being sucked into the compression element. Another object of the present invention is to reduce the suction of the heated and expanded refrigerant gas in the closed container into the suction pipe without heating the suction pipe with the lubricating oil.

Further, in the above-mentioned conventional structure, since the suction pipe is constituted by the branch pipe having the same passage sectional area, the pressure pulsation in the suction pipe is large and noise is generated.

The present invention solves the above conventional problems, and an object thereof is to reduce the pressure pulsation in the suction pipe and to reduce the noise.

[0012]

In order to solve the above-mentioned problems, a compressor according to the present invention is provided with a suction pipe, a first branch pipe connected to the suction muffler, and a suction pipe and the first branch pipe. And a tank having a cross-sectional area larger than the cross-sectional area of the passage of the suction pipe, and a liquid refrigerant discharge passage consisting of a trap for communicating the inside of the tank with the inside of the closed container is provided at the bottom of the tank.

Further, a U-shaped second branch pipe for communicating the inside of the tank and the inside of the closed container is formed at the lower part of the tank.

Further, it comprises a plurality of tanks connected by at least one communication passage.

[0015]

According to the present invention, the liquid refrigerant is discharged into the closed container without being sucked into the compression element by the above-mentioned structure,
It is possible to reduce the suction of the heated and expanded refrigerant gas in the closed container into the suction pipe without directly heating the suction pipe by the lubricating oil.

Further, it is possible to reduce pressure pulsation in the suction pipe and noise.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A suction pipe according to a first embodiment of the present invention will be described below with reference to the drawings. It should be noted that the same components as those of the related art are designated by the same reference numerals and detailed description thereof is omitted.

FIG. 1 is a vertical sectional view of a compressor according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of the main part of FIG.

In FIGS. 1 and 2, 5 is a suction pipe and 6 is a first pipe.
It is a branch pipe and is composed of a tank 7 having a cross-sectional area larger than that of the suction pipe 5. The suction pipe 5 communicates with the outside of the closed container 1, and the first branch pipe 6 is connected to a tightly wound spring 10. Reference numeral 8 denotes a liquid refrigerant discharge passage formed of an N-shaped trap provided in the lower portion of the tank 7, and connects the tank 7 and the inside of the closed container 1 through the opening 8a in the tank and the opening 8b in the closed container. .

Regarding the compressor configured as described above,
The operation will be described below. First, the refrigerant gas returned from the external cooling circuit (not shown) to the compression element 2 driven by the electric element 3 is a suction pipe 5, a tank 7, a first branch pipe 6, a close coil spring 10, and an insertion pipe 9. Through the suction muffler 11. At this time, the closely wound spring 1
A part of the refrigerant gas is discharged into the close contact container 1 through the close contact gap of 0, and the electric element 3 and the like can be cooled.

On the contrary, the heated and expanded refrigerant gas in the closed container 1 is passed through the close contact gap and the close wound spring 1
The amount sucked into 0 can be reduced by adjusting the contact amount of the contact winding spring 10. Furthermore, when the liquid refrigerant is sucked from the suction pipe 5, the cross-sectional area of the tank 7 is larger than the cross-sectional area of the suction pipe 5, so that the flow velocity of the liquid refrigerant can be rapidly reduced, and On the other hand, the tank 7 serves as a trap. Then, the liquid refrigerant accumulated in the lower portion of the tank 7 is discharged by its own weight into the closed container 1 through the liquid refrigerant discharge passage 8 together with the lubricating oil 12a in the liquid refrigerant discharge passage 8.

After the liquid refrigerant is discharged, the lubricating oil 12a returned from the cooling circuit into the suction pipe 5 is accumulated in the liquid refrigerant discharge passage 8, so that the tank 7 and the closed container 1 are shut off and the closed container 1 is closed.
The heated and expanded refrigerant gas in the opening 8b in the closed container
Also, it is not sucked into the suction pipe 5. Further, since the tank 7 is not immersed in the lubricating oil 12, the heat of the lubricating oil 12 is not transferred to the suction pipe 5 via the tank 7 and the refrigerant gas is not heated.

As described above, the hermetic compressor of this embodiment is
An intake pipe 5, a first branch pipe 6 connected to the intake muffler 11, and a tank 7 having a cross-sectional area larger than that of the intake pipe 5 provided between the intake pipe 5 and the first branch pipe 6. Consists of
N that connects the inside of the tank 7 and the inside of the closed container 1 to the lower part of the tank 7
Since the liquid refrigerant discharge passage 8 has a V-shape, the liquid refrigerant can be prevented from being sucked into the compression element 2, and the heat of the lubricating oil 12 is transferred to the suction pipe 5 to heat the refrigerant gas. Without being sucked into the suction pipe 5 by the heated and expanded refrigerant gas in the closed container 1, and by supplying only the dense refrigerant gas to the compression element 2, the volume efficiency can be improved. it can.

Next, a suction pipe according to a second embodiment of the present invention will be described with reference to the drawings. The same components as those in the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted.

FIG. 3 is a vertical sectional view of a compressor according to the second embodiment of the present invention. FIG. 4 is a cross-sectional view of the main parts of FIG.

In FIG. 3, the U-shaped second branch pipe 17 is connected to the lower portion of the tank 16, and the open end 17 a at one end of the second branch pipe 17 is opened in the closed container 1.

Regarding the compressor configured as described above,
The operation will be described below. When the liquid refrigerant is sucked from the suction pipe 5, the cross-sectional area of the tank 16 is larger than the cross-sectional area of the suction pipe 5, so that the flow velocity of the liquid refrigerant can be drastically reduced, and 16 is a trap.
The liquid refrigerant accumulated in the lower portion of the tank 16 is discharged by its own weight into the closed container 1 through the second branch pipe 17 together with the lubricating oil 12b in the second branch pipe 17. After the liquid refrigerant is discharged, the lubricating oil 12 returning from the cooling circuit collects in the second branch pipe 17 and shuts off the tank 16 and the sealed container 1. By making the passage cross-sectional area of the U-shaped second branch pipe 17 sufficiently small, the lubricating oil 12b can be promptly fed into the second branch pipe 17 even if the amount of lubricating oil returning from the cooling circuit is small. Can be stored.

Therefore, even if the amount of lubricating oil returned from the cooling circuit is small, after discharging the liquid refrigerant from the second branch pipe 17,
The lubricating oil 12b can be quickly stored in the second branch pipe 17, the time until the tank 16 and the closed container 1 are shut off is shortened, and the closed container 1 is heated and expanded even after the liquid refrigerant is discharged. Refrigerant gas is not supplied into the compression element 2, and the volumetric efficiency can be improved.

As described above, the hermetic compressor of this embodiment is
Since it is composed of the U-shaped second branch pipe 17, the lubricating oil 12b is quickly accumulated in the second branch pipe 17 after the liquid refrigerant is discharged even if the amount of the lubricating oil returned from the cooling circuit is small. be able to.

Therefore, the lubricating oil 12b can be quickly accumulated in the second branch pipe 17 even after the liquid refrigerant is discharged, and the time until the tank 16 and the closed container 1 are shut off is shortened. However, the heated and expanded refrigerant gas in the closed container 1 is no longer supplied to the compression element 2,
It is possible to improve the volumetric efficiency.

Next, a suction pipe according to a third embodiment of the present invention will be described with reference to the drawings. The same components as those in the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted.

FIG. 5 is a vertical sectional view of a compressor according to the third embodiment of the present invention. FIG. 6 is a cross-sectional view of the main parts of FIG.

In FIGS. 5 and 6, reference numeral 18 is a tank,
The first tank 19 has a cross-sectional area larger than the passage cross-sectional area of the suction pipe 5, and the second tank 20 communicated with the first tank 19 through at least one communication passage. Reference numeral 21 is an N-shaped liquid refrigerant discharge passage provided in the lower portion of the second tank.

Regarding the compressor configured as described above,
The operation will be described. Suction pipe 5, first tank 19, first
When the refrigerant gas flows through the branch pipe 6, pressure pulsation or the like occurs and noise is generated. However, the noise can be silenced by the second tank 20 which is a resonance chamber for the first tank designed for a specific frequency.

Therefore, the noise generated by the pressure pulsation of the suction pipe 5 and the like is silenced by the second tank.

As described above, the hermetic compressor of the present invention comprises the suction pipe 5 and the tank 18 including the first tank 19 and the second tank 20 communicating with the first tank 19 through at least one communication passage. Therefore, the noise generated by the pressure pulsation of the suction pipe 5 is generated in the second tank 2 which is the resonance chamber.
Mute by 0.

As shown in FIG. 7, a U-shaped second branch pipe 23 may be provided below the second tank 22 instead of the N-shaped liquid refrigerant discharge passage 21.

[0038]

As described above, the present invention is larger than the sectional area of the suction pipe, the first branch pipe connected to the suction muffler, and the suction pipe provided between the suction pipe and the first branch pipe. Since it is composed of a tank having a cross-sectional area and a trap-shaped liquid refrigerant discharge passage provided in the lower portion of the tank, lubricating oil is introduced into the N-shaped liquid refrigerant discharge passage provided in the lower portion of the tank. By storing, the liquid refrigerant can be prevented from being sucked into the compression element, and the heat of the lubricating oil is not transferred to the suction pipe to heat the refrigerant gas. It is possible to reduce the suction of air and to improve the volumetric efficiency by supplying only the dense refrigerant gas to the compression element.

Further, since the lower part of the tank is constituted by the U-shaped second branch pipe which communicates the inside of the tank with the inside of the closed container, the amount of the lubricating oil returned from the cooling circuit is small after the liquid refrigerant is discharged. However, since the lubricating oil can be quickly accumulated in the second branch pipe, the time until the tank is closed from the closed container is shortened, and the heated and expanded refrigerant gas in the closed container is discharged even after the liquid refrigerant is discharged. Since it is not supplied into the compression element, the volumetric efficiency can be improved.

Further, since it is composed of the first tank and the tank composed of the second tank communicating with the first tank through at least one communication passage, noise generated by pressure pulsation of the suction pipe or the like is generated in the resonance chamber. Is muted by the second tank which is

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a compressor according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the main part of the embodiment.

FIG. 3 is a vertical sectional view of a compressor according to a second embodiment of the present invention.

FIG. 4 is a sectional view of a main part of the same embodiment.

FIG. 5 is a vertical sectional view of a compressor according to a third embodiment of the present invention.

FIG. 6 is a sectional view of a main part of the embodiment.

FIG. 7 is a cross-sectional view of a main part of a compressor having another configuration according to the embodiment.

FIG. 8 is a vertical sectional view of a conventional compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Airtight container 2 Compression element 3 Electric element 5 Suction pipe 6 First branch pipe 7 Tank 8 Liquid refrigerant discharge passage 10 Closely wound coil spring 11 Suction muffler 12 Lubricating oil 16 Tank 17 Second branch pipe 18 Tank

Claims (4)

[Claims] 1. An airtight container, a compression element and an electric element elastically supported in the airtight container, lubricating oil accumulated in the airtight container, and a suction pipe attached to the return side of a cooling cycle. A first branch pipe connected to the suction muffler, the suction pipe being provided between the suction pipe and the suction port of the compression element; and the suction pipe and the first branch pipe.
A tank having a cross-sectional area larger than the passage cross-sectional area of the suction pipe arranged between the branch pipes, and at the bottom of the tank,
A hermetic compressor provided with a liquid refrigerant discharge passage including an N-shaped trap that communicates the inside of the tank and the inside of the hermetic container. 2. The hermetic compressor according to claim 1, wherein the first branch pipe is formed of a coil spring closely wound. 3. The hermetic compressor according to claim 1, wherein a U-shaped second branch pipe that connects the inside of the tank and the inside of the closed container is formed at the lower part of the tank. 4. A tank comprising a plurality of tanks communicating with each other through at least one communication passage.
The hermetic compressor described.