KR20190085418A - Long pipe cooling system - Google Patents

Abstract

The present invention provides a cooling system for a long pipe, capable of being easily installed and maintained. The cooling system for a long pipe includes: a compressor compressing a refrigerant; a fluid processing unit separating gas and fluid in oil among the refrigerant of high pressure and the oil and discharging the refrigerant of the high pressure; a condenser condensing the refrigerant of the high pressure, discharged from the fluid processing unit; a first high-pressure pipe connecting the fluid processing unit and condenser so that the refrigerant of the high pressure discharged from the fluid processing unit flows; an evaporator evaporating the refrigerant of the high pressure, discharged from the condenser; an expansion valve decompressing the refrigerant of the high pressure, which is discharged from the condenser, to be the refrigerant of low pressure; a second high-pressure pipe connecting the condenser and the expansion valve so that the refrigerant of the high pressure, which is discharged from the condenser, flows; a first low-pressure pipe connecting the expansion valve and the evaporator so that the refrigerant of the low pressure, which is decompressed by the expansion valve, flows; and a second low-pressure pipe connecting the evaporator and the compressor so that the refrigerant of the low pressure, which is discharged from the evaporator, flows and is collected to the compressor.

Description

[0001] The present invention relates to a long pipe cooling system,

[0001] The present invention relates to a cooling system for a large-capacity pipe, in which a large-capacity oil water separator, which is essential for a cooling system for a large pipe having a refrigerant pipe having a length of 30 m or more, and pipes and devices for pneumatic operation are housed in one fluid treatment unit, So that it is simple to install and easy to maintain and maintain.

Generally, the air conditioner is designed in various forms. In the case of a building, an outdoor unit is installed on the roof, and a plurality of copper pipes are connected to the evaporator through the wall and the ceiling to circulate the refrigerant to generate cold or warm air. It is means.

Such an air conditioner is usually called an air conditioner, and it is installed in a large amount in a large building or a subway history.

Meanwhile, the compressor applied to the air conditioner compresses the refrigerant to a high temperature and a high pressure, and transfers the compressed refrigerant to the respective members. The refrigerant compressed at high temperature and high pressure through the compressor is circulated through the respective members of the air conditioner. The refrigerant passing through the member expansion valve constituting the air conditioner is sucked into the suction end side of the compressor at a low temperature and low pressure.

In addition, the compressor uses oil in addition to the refrigerant. This is to increase the compression efficiency of the refrigerant. If the oil is insufficient, the noise generated from the compressor becomes large and the performance of the air conditioner deteriorates. .

In the case of general domestic air conditioners, the piping length is about 5 m. Even if the refrigerant and oil circulate together in the piping, it is not difficult to recover the oil. However, in the case of large buildings, the length of the piping is considerable. When the oil flows into the internal pipe due to an unintentional gradient, it is difficult to recover the oil in the pipe and the efficiency of the air conditioner deteriorates.

In addition, in the case of a long-haul air conditioner, the refrigerant must be sent far away, so that the pressure difference between the refrigerant flowing in the piping connected to the suction end side of the compressor and the refrigerant flowing in the piping connected to the output end side is increased. The instantaneous restart of the compressor becomes impossible due to the difference in pressure between the output end and the suction end of the compressor. To solve this problem, pneumatic operation must be carried out.

Accordingly, most long-term air conditioners must have separate piping and equipment for the above-mentioned pneumatic operation, and further piping and equipment must be provided to prevent the above-mentioned problem of oil from flowing into the piping inside the building. As shown in FIG. 9, the piping and the equipment before and after the compressor are very complicated, and there is a high possibility that the piping is connected incorrectly during the construction process, and maintenance is difficult even if the construction is good.

Korean Patent Registration No. 10-0531838

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a large-capacity oil water separator and a pipe and apparatus for pneumatic operation, which are essential for a cooling system for a large- The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a cooling system for a long pipe which is simple and easy to install and maintain.

A cooling system for a long tube according to the present invention comprises: a compressor for compressing a refrigerant; A fluid processor connected to an output end of the compressor for separating the high-pressure refrigerant discharged from the compressor and the oil in the oil into a gas-liquid separator and discharging high-pressure refrigerant; A condenser for condensing the high-pressure refrigerant discharged from the fluid treatment unit; A first high-pressure pipe connecting the fluid treatment unit and the condenser such that the high-pressure refrigerant discharged from the fluid treatment unit flows; An evaporator for evaporating the high-pressure refrigerant discharged from the condenser; An expansion valve installed between the condenser and the evaporator to reduce the high-pressure refrigerant discharged from the condenser to low-pressure refrigerant; A second high-pressure pipe connecting the condenser and the expansion valve so that the high-pressure refrigerant discharged from the condenser flows; A first low-pressure pipe connecting the expansion valve and the evaporator so that the low-pressure refrigerant decompressed in the expansion valve flows; And a second low pressure pipe connecting the evaporator and the compressor so that the low pressure refrigerant discharged from the evaporator flows and is recovered to the compressor,

The fluid treatment unit includes: a body defining an internal space; A suction pipe connected to the internal space of the body at one end and connected to the compressor at the other end to guide the high-pressure refrigerant discharged from the compressor and the oil into the internal space of the main body; A discharge pipe communicating with an inner space of the main body at one end and connected to the first high-pressure pipe to guide the high-pressure refrigerant passed through the main body to the first high-pressure pipe; Pressure pipe connected to the second low-pressure pipe and the capillary to communicate with the high-pressure refrigerant passing through the main body and the low-pressure oil at the bottom of the main body to the second low-pressure pipe; A capillary having one end abutting the lower surface of the main body and the other end guiding the oil recovered to the lower surface of the main body directly to the bypass pipe to the bypass pipe; And a first valve installed in a path of the bypass pipe to intermittently open and close the bypass pipe.

According to another preferred aspect of the present invention, the bypass pipe includes three connection points, the first connection point is located at the uppermost point and the high-pressure refrigerant flows into the main body, and the second connection point and the third connection point are located at the first And the second connection point is located inside the main body and connected to the capillary while the third connection point is located outside the main body and connected to the second low pressure pipe.

According to another preferred aspect of the present invention, the bypass pipe includes a bending pipe in which a high-pressure refrigerant flows and in which the first valve is installed, and an oil pipe in which the other end of the capillary is directly connected to the bending pipe, Only the portion where the first valve is installed is located outside the main body 100 and all the portions other than the portion where the first valve is provided are all installed inside the main body 100 .

According to another preferred aspect of the present invention, the first valve is opened when the refrigerant remaining in the high-pressure pipe before the operation of the compressor and the refrigerant remaining in the low-pressure pipe are closed, .

According to another preferred aspect of the present invention, the gas-liquid separated oil into the internal space of the main body is guided through the bypass pipe and flows to the second low-pressure pipe.

The effects according to the present invention are as follows.

First, the oil water separator used in the cooling system for the long pipe, the equipment for the pneumatic operation, and the piping are housed in one fluid treatment unit to minimize the piping and the equipment exposed to the outside, so that the external structure is simple, There is an advantage that the installation and maintenance are easy.

Second, the present invention is not limited to the complicated implementation of the flow path of the refrigerant, but rather to a simple structure in which the fluid treatment section is connected between the first high pressure pipe and the compressor and the bypass pipe of the fluid treatment section is connected to the second low pressure pipe, The structure can be simplified. As a result, there is an advantage that ease of construction is improved, ease of maintenance and repair is increased, and the occupied area occupied by the apparatus can be minimized.

Third, in the long pipe, oil is low at the low point due to an unintended gradient of the piping installed inside the building during the construction process, so that it is difficult to recover the oil. The oil discharged from the compressor is efficiently separated from the body of the fluid treatment unit It is possible to solve the problem of oil accumulation inside the long pipe.

Fourth, when the operation of the compressor is stopped in the fluid processing unit having a simple structure, the first valve is opened to circulate the high-pressure refrigerant remaining in the high-pressure pipe to the low-pressure pipe side through the bypass pipe, So that the refrigerant gas is allowed to assume a pneumatic pressure with respect to each other, whereby the operating condition of the compressor can be quickly secured within a few seconds.

Fifth, since the main body is configured such that the case, the upper cover and the lower cover are coupled and assembled to each other, the ease of cleaning the main body is improved and the gas-liquid separation of oil and the pressure- The number of parts can be simplified.

1 is a conceptual diagram schematically showing a cycle of a cooling system for a supercharger according to the present invention;
FIG. 2 is a schematic perspective view of a cooling system for an extension pipe according to the present invention; FIG.
3 is a schematic cross-sectional view showing an internal configuration of a fluid treatment section according to the present invention.
4 is a perspective view for explaining a configuration of a bypass pipe according to the present invention;
5 is a conceptual diagram for explaining refrigerant circulation in a state where the compressor is operated in the cycle of the cooling system for the long tube according to the present invention.
6 is a conceptual diagram for explaining a pressure difference between a high-pressure pipe and a low-pressure pipe in a state where the operation of the compressor is interrupted.
7 is a conceptual diagram for explaining refrigerant circulation in a state in which the operation of the compressor is stopped in the cycle of the cooling system for the long tube according to the present invention.
8 is a conceptual diagram for explaining the pressure difference between the high-pressure pipe and the low-pressure pipe in the state of FIG. 7;

For a better understanding of the present invention, a preferred embodiment of the present invention will be described with reference to the accompanying drawings. The embodiments of the present invention may be modified into various forms, and the scope of the present invention should not be construed as being limited to the embodiments described in detail below. The present embodiments are provided to enable those skilled in the art to more fully understand the present invention. Therefore, the shapes and the like of the elements in the drawings can be exaggeratedly expressed to emphasize a clearer description. It should be noted that in the drawings, the same members are denoted by the same reference numerals. Detailed descriptions of well-known functions and constructions which may be unnecessarily obscured by the gist of the present invention are omitted.

2 is a schematic perspective view of a cooling system for a long tube according to the present invention, and FIG. 3 is a perspective view of the internal structure of the fluid treatment unit according to the present invention. And FIG. 4 is a perspective view illustrating a structure of a bypass pipe according to the present invention. Referring to FIG.

1, a cooling system for a boiler according to the present invention includes a compressor (CPS), an evaporator (EPT), a condenser (CDS), an expansion valve (EV) and a fluid treatment section 10, A flow path for mutual piping is provided. The flow path includes first and second high pressure pipes HP1 and HP2 and first and second low pressure pipes LP1 and LP2.

In more detail, the cooling system for a long pipe according to the present invention comprises a compressor (CPS) for compressing a refrigerant, a high-pressure refrigerant connected to an output end (CPS-10) of the compressor (CPS) (CDS) for condensing the high-pressure refrigerant discharged from the fluid treatment section (10), a high-pressure refrigerant discharged from the high-pressure refrigerant discharged from the fluid treatment section (10) A first high pressure pipe HP1 for connecting the fluid treatment unit 10 and the condenser CDS, an evaporator EPT for evaporating the high pressure refrigerant discharged from the condenser CDS, an evaporator EPT (CDS) and an expansion valve (EV) so that the high-pressure refrigerant discharged from the condenser (CDS) flows through the expansion valve (EV), which is installed between the condenser (CDS) The second high-pressure pipe (HP2) (LP1) connecting the expansion valve (EV) and the evaporator (EPT) such that the low-pressure refrigerant decompressed in the expansion valve (EV) flows, and a low-pressure refrigerant discharged from the evaporator And a second low pressure pipe LP2 connecting the evaporator EPT and the compressor CPS so as to be recovered to the compressor CPS.

At this time, the fluid treatment section 10 is directly connected to the output end CPS-1 of the compressor CPS so that the oil discharged from the compressor CPS flows through the first and second high pressure pipes HP1 and HP2, the condenser CDS, The oil is immediately separated from the gas at the downstream end of the compressor so as not to interrupt the flow path from the evaporator (EV) and the evaporator (EPT).

Since the compressor (CPS), the condenser (CDS), the expansion valve (EV), and the evaporator (EPT) are known members provided in a general air conditioning cycle, a detailed description thereof will be omitted and only the fluid treatment section would.

The fluid treatment unit 10 includes a main body 100 having an internal space formed therein and one end connected to the internal space of the main body 100 and the other end connected to a compressor CPS, A suction pipe 200 for guiding the oil to the internal space of the main body 100, a first end communicating with the internal space of the main body 100 and a second end connected to the first high-pressure pipe HP1, Pressure piping HP1, one end communicating with the internal space of the main body 100, and the other end connected to the second low-pressure pipe LP2 and the capillary 600 A bypass pipe 400 for guiding the high-pressure refrigerant passed through the main body 100 and the oil under the main body 100 to the second low-pressure pipe LP2, a bypass pipe 400 connected to the bypass pipe 400, The capillary tube 600 positioned at the lower portion of the bypass tube 400 and the bypass tube 400 And a first valve (500) installed in the furnace.

3, the main body 100 includes a hollow case 110 having upper and lower openings, upper and lower covers 120 and 130 coupled to upper and lower portions of the case 110, And a lower cover (130). At this time, the upper cover 120 and the lower cover 130, which are coupled to the case 110, may be threaded on the inner circumferential surface and the outer circumferential surface so as to be coupled by the respective screw tightening methods, And the cleaning easiness of the main body 100 can be greatly improved. However, it goes without saying that the case 110, the upper cover 120, the lower cover 130, etc. may be integrally formed.

Next, the suction pipe 200 interconnects the output port CPS-1 of the compressor CPS-1 and the main body 100 and guides the high-pressure refrigerant discharged from the compressor CPS and the oil to the internal space of the main body 100 . At this time, the suction pipe 200 is vertically connected to the upper end of the main body 100, more specifically, to the upper cover so that the high-pressure refrigerant discharged from the compressor CPS and the oil are injected in a downward direction toward the inner space of the main body 100 do.

Meanwhile, the suction pipe 200 may be provided with a high-pressure refrigerant discharged from the compressor CPS and a check valve 210 for preventing the oil from flowing back to the compressor CPS.

The fluid treatment unit 10 according to the present invention may further include a filter 700 installed in the inner space of the main body 100 to collect oil discharged from the compressor CPS. A first collecting net 710 installed at an upper part of the inner space of the main body 100 and a second collecting net 710 installed at an inner space of the main body 100 and spaced downward from the first collecting net 710, And a collection network 720.

As a result, the refrigerant sprayed in the downward direction and the oil scattered in the oil adhere to the first collection net 710 and the second collection net 720, thereby increasing the gas-liquid separation efficiency.

In addition, the first collection net 710 causes the relatively light oils rising together with the refrigerant to stick to each other, so that the oil does not flow back to the discharge pipe 300 side, and when the differential oil contained in the rising refrigerant is present, So that even a small amount can not be discharged to the discharge pipe 300.

Next, the discharge pipe 300 interconnects the main body 100 and the high-pressure pipe HP, and the high-pressure refrigerant flows to the discharge pipe 300 via the main body 100 while the compressor CPS is driven. At this time, the discharge pipe 300 can be positioned higher than the first collecting net 710, and the differential oil contained in the refrigerant scattered or rising in the inner space of the main body 100 flows into the first collecting net 710 So that only pure high-pressure refrigerant can flow through the discharge pipe 300.

Particularly, in order to prevent oil from being discharged to the discharge pipe 300, the end of the discharge pipe 300 is bent upward as shown in the drawing, and the end of the discharge pipe 300 is installed higher than the end of the suction pipe 200.

In addition, the discharge pipe 300 may be provided with a second valve 310 for interrupting the high-pressure refrigerant flowing therethrough.

The bypass pipe 400 largely serves two functions. That is, in order to perform the pneumatic operation, the high pressure refrigerant at the output of the compressor (CPS) is fed to the input of the compressor (CPS) to match the pressure at the input and output of the compressor (CPS) As shown in FIG.

The bypass pipe 400 is installed inside the main body 100 to prevent complicated piping and equipment from being exposed to the outside of the main body 100. A valve requiring a relatively large number of times of maintenance during operation is installed in the main body 100, 3 and 4 so as to be exposed to the outside.

In particular, when the first valve 500 is opened to adjust the pressure of the input end and the output end of the compressor CPS, the capillary 600 can be operated without installing a separate valve. The high-pressure gas in the inside flows into the third connection point P3 where the pressure is lower than that at the capillary.

Since the high-pressure gas flows instantaneously according to the opening and closing of the first valve 500, the bypass pipe 400 frequently generates vibration of the pipe, thereby causing a problem in the welded part. To prevent this, 400 is brought into close contact with the main body of the main body as much as possible. In some cases, this portion may be completely fixed to the inner wall of the main body by welding or the like.

The bypass pipe 400 includes three connection points. The first connection point P1 is located at the uppermost position and is the point where the high pressure refrigerant flows into the main body 100. The second connection point P2 and the third connection point P3 are located at the other end of the first connection point P1 The second connection point P2 is located inside the main body 100 and connected to the capillary 600 and the third connection point P3 is located outside the main body 100 and connected to the second low pressure pipe LP2 .

That is, the bypass pipe 400 connects the main body 100 and the second low-pressure pipe LP2, and connects the main pipe 100 to the second low-pressure pipe LP2, Lt; / RTI > The oil separated in the internal space of the main body 100 is guided to the bypass pipe 400 and continuously flows to the second low pressure pipe LP2 and the oil that flows into the second low pressure pipe LP2 flows into the compressor (CPS-2) of the CPS.

The fluid treatment unit 10 according to the present invention has one end contacting the lower surface of the main body 100 and the other end being directly connected to the bypass pipe 400 to bypass the gas- And a capillary (600) for guiding to the tube (400). At this time, the capillary tube 600 is spirally wound on the wall surface of the main body 100 from the lower part of the main body 100 toward the upper part. The capillary tube 600 feeds the oil by a pressure difference. The amount of the oil to be returned varies depending on the length of the capillary tube 600, and the capillary tube 600 has a length sufficient to effectively return the oil.

The capillary tube 600 may be spirally arranged on the wall surface of the main body 100 to control the temperature inside the main body 100.

More specifically, the bypass pipe 400 connects the bending pipe 410 in which the high-pressure refrigerant flows and the first valve 500 is installed and the oil pipe 420 to which the other end of the capillary pipe 600 is directly connected It is in the form of a branch. In other words, the high-pressure refrigerant discharged into the internal space of the main body 100 selectively flows into the second low-pressure pipe LP2 depending on whether the first valve 500 opening / closing the bending pipe 410 is opened, Is continuously supplied to the oil pipe 420 by the capillary 600 and finally circulated to the suction end CPS-2 of the compressor CPS-2.

At this time, one end of the oil pipe 420 is gradually narrowed in order to improve airtightness with the capillary tube 600. Accordingly, when the first valve 500 is opened, The refrigerant can be prevented from flowing into the capillary tube 600.

In addition, the bending pipe 410 may reduce the flow velocity of the high-pressure refrigerant flowing through the bending pipe 410 by reducing the flow rate of the flow pipe several times, thereby reducing noise due to the vibration of the flow pipe.

3, the first valve 500 is installed on the path of the bending pipe 410 exposed to the outside of the main body 100, so that only the bending pipe 410 is partially exposed to the outside of the main body 100, And the first valve 500 is exposed to the outside, so that the first valve 500 can be easily maintained and maintained.

The lower cover 130 may be provided with a drain 131 for discharging the oil stored in the inner space of the main body 100. [ In other words, the drain 131 is a means for opening and closing the oil discharge hole 132 passing through the lower cover 130, and it is difficult to remove the oil only by the capillary tube 600, When the oil exceeds the predetermined level, the drain 131 can be operated to discharge the oil contained in the internal space of the main body 100 to the outside.

 The cooling system for the long pipe according to the present invention may further include a control unit (not shown) for electrically controlling the first valve 500 and the second valve 310.

In addition, a pressure sensor (not shown) may be installed in each of the first and second high-pressure pipes HP1 and HP2 and the first and second low-pressure pipes LP1 and LP2 to detect the pressure of the refrigerant flowing in the flow pipe, The pressure sensor is electrically connected to the control unit, and the driving of the compressor (CPS) may be controlled based on the detection value of the pressure sensor.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG.

5 is a conceptual view for explaining refrigerant circulation in a state in which the compressor is operated in a cycle of the cooling system for a long pipe according to the present invention, and FIG. 6 is a conceptual view for explaining the circulation of the refrigerant in the high- FIG. 7 is a conceptual view for explaining the refrigerant circulation in a state where the operation of the compressor is stopped in the cycle of the cooling system for the long tube according to the present invention. FIG. 8 is a conceptual view for explaining the circulation of the high- Fig. 8 is a conceptual diagram for explaining the pressure difference of the piping. Fig.

5, when the compressor (CPS) is in operation, that is, when the cooling system for the long tube is operating, the high-pressure refrigerant discharged from the output end (CPS-1) Pressure refrigerant flows to the first high-pressure pipe HP1 which is connected to the discharge pipe 300 and is discharged through the condenser (CDS), the expansion valve (EV) and the evaporator (EPT) To the compressor (CPS).

At this time, when the oil is discharged into the internal space of the main body 100, the gas is entirely separated by the gas and flows in the order of the capillary tube 600 and the oil tube 420, discharged from the internal space of the main body 100, LP2 to the suction end CPS-2 side of the compressor CPS.

As a result, since the oil discharged from the compressor (CPS) is not structured to circulate the oil passage as a whole, it is possible to prevent problems such as clogging of the pipe caused by oil accumulation in the pipe or the like in advance.

On the other hand, the flow path of the refrigerant is indicated by a one-dot chain line, and the flow path of the oil is indicated by a two-dot chain line.

The refrigerant remaining in the first high-pressure pipe HP1 and the second low-pressure pipe LP2 is discharged from the compressor CPS from the point of time when the operation of the compressor CPS is stopped, The operation can not be performed until the pneumatic pressure is achieved.

In other words, once the operation of the cooling system for the large-capacity boiler is stopped, the cooling system can not be operated until the restarting condition of the compressor (CPS) is provided.

As shown in FIG. 7, when the high-pressure refrigerant remaining in the first high-pressure pipe HP1 is circulated through the bypass pipe 400 to the second low-pressure pipe LP2 through the inner space of the main body 100, The high pressure refrigerant remaining in the first and second high pressure pipes HP1 and HP2 and the low pressure refrigerant remaining in the first and second low pressure pipes LP1 and LP2 within a few seconds can establish a pneumatic pressure.

For example, when the power supply system is restarted, when the power supply signal is applied, the compressor (CPS), which is not operated as shown in FIG. 7, is not operated immediately but the first valve 500 is opened The high pressure refrigerant circulates in the order of the first high pressure pipe HP1 → the internal space of the main body 100 → the bypass pipe 400 → the second low pressure pipe LP2, The pressure of the refrigerant remaining in the first and second low pressure pipes LP1 and LP2 is maintained and the operating condition of the compressor CPS is provided so that the compressor CPS can be quickly restarted.

In other words, the first valve 500 is opened when the refrigerant remaining in the first high-pressure pipe HP1 and the second low-pressure pipe LP2 before the compressor CPS is operated to be in a pneumatic state and the compressor CPS is operated, Pressure refrigerant introduced into the internal space of the main body 100 to the discharge pipe 300.

It will be apparent to those skilled in the art that various modifications and equivalent arrangements may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, it is to be understood that the present invention is not limited to the above-described embodiments. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims. It is also to be understood that the invention includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

CPS: Compressor
CDS: Condenser
EV: expansion valve
EPT: Evaporator
HP1: 1st high pressure piping
HP2: 2nd high pressure piping
LP1: First low pressure pipe
LP2: Second low pressure piping
10:
100:
200: suction pipe
300: discharge pipe
400: Bypass pipe
500: first valve
600: capillary tube
700: Filter

Claims (5)

A compressor for compressing the refrigerant;
A fluid processor connected to an output end of the compressor for separating the high-pressure refrigerant discharged from the compressor and the oil in the oil into a gas-liquid separator and discharging high-pressure refrigerant;
A condenser for condensing the high-pressure refrigerant discharged from the fluid treatment unit;
A first high-pressure pipe connecting the fluid treatment unit and the condenser such that the high-pressure refrigerant discharged from the fluid treatment unit flows;
An evaporator for evaporating the high-pressure refrigerant discharged from the condenser;
An expansion valve installed between the condenser and the evaporator to reduce the high-pressure refrigerant discharged from the condenser to low-pressure refrigerant;
A second high-pressure pipe connecting the condenser and the expansion valve so that the high-pressure refrigerant discharged from the condenser flows;
A first low-pressure pipe connecting the expansion valve and the evaporator so that the low-pressure refrigerant decompressed in the expansion valve flows; And
And a second low pressure pipe connecting the evaporator and the compressor so that the low pressure refrigerant discharged from the evaporator flows and is recovered to the compressor,
Wherein the fluid treatment section comprises:
A body forming an internal space;
A suction pipe connected to the internal space of the body at one end and connected to the compressor at the other end to guide the high-pressure refrigerant discharged from the compressor and the oil into the internal space of the main body;
A discharge pipe communicating with an inner space of the main body at one end and connected to the first high-pressure pipe to guide the high-pressure refrigerant passed through the main body to the first high-pressure pipe;
Pressure pipe connected to the second low-pressure pipe and the capillary to communicate with the high-pressure refrigerant passing through the main body and the low-pressure oil at the bottom of the main body to the second low-pressure pipe;
A capillary having one end abutting the lower surface of the main body and the other end guiding the oil recovered to the lower surface of the main body directly to the bypass pipe to the bypass pipe; And
And a first valve installed in a path of the bypass pipe for controlling the opening and closing of the bypass pipe. The method according to claim 1,
The bypass pipe includes three connection points. The first connection point is located at the uppermost point, and the high-pressure refrigerant flows into the main body. The second connection point and the third connection point are located at the other end of the first connection point. Wherein the connection point is located inside the main body and is connected to the capillary, and the third connection point is located outside the main body and connected to the second low-pressure pipe. The method according to claim 1,
Wherein the bypass pipe is in the form of a branch pipe through which a high-pressure refrigerant flows and is connected to a bending pipe provided with the first valve and an oil pipe connected to the bending pipe and directly connected to the other end of the capillary, Respectively,
Wherein only the portion where the first valve is installed is located outside the main body (100), and all the portions other than the portion where the first valve is provided are installed inside the main body (100). The method according to claim 1,
Wherein the first valve opens the high-pressure piping before operation of the compressor and the refrigerant remaining in the low-pressure piping to open the high pressure refrigerant guided to the internal space of the main body to the discharge pipe when the compressor is operated, Cooling system. The method according to claim 1,
And the gas-liquid separated into the internal space of the main body is guided through the bypass pipe and flows to the second low-pressure pipe.

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