JP7188563B2 - cooling system - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid separator, a cooling system, and a gas-liquid separation method, which are mainly used in cooling systems and separate liquid flowing from an evaporator into a compressor.

In a cooling system consisting of an evaporator, a compressor, a condenser and an expansion valve, an accumulator serving as a liquid separator may be installed in front of the suction port of the compressor.
For example, the cooling system shown in Patent Document 1 includes an evaporator, a compressor, a condenser, and a pressure reducing expansion valve along a refrigerant flow path. The evaporator absorbs ambient heat by evaporating liquid-phase refrigerant. A compressor compresses the vapor-phase refrigerant delivered from the evaporator. The condenser releases the heat of the refrigerant pressurized by the compressor to condense the vapor phase refrigerant. The decompression expansion valve decompresses and expands the liquid-phase refrigerant cooled by the condenser.
This cooling system disclosed in Patent Literature 1 is provided with a liquid separator that separates the refrigerant from gas and liquid after passing through the evaporator on the upstream side of the compressor.

This liquid separator has a separation container formed vertically as a whole. A refrigerant inlet pipe and a vapor refrigerant outlet pipe are installed on the upper part of the separation container. Also, a liquid-phase refrigerant outflow pipe is installed at the bottom of the separation container.
In this liquid separator, the refrigerant flowing into the inside via the refrigerant inflow pipe rotates in the circumferential direction along the inner wall of the liquid separator of the separation container, and flows into liquid-phase refrigerant and gas-phase refrigerant. centrifuged to
After that, the gas-phase refrigerant in the separation vessel is guided to the pressure reducing expansion valve through the upper gas-phase refrigerant outflow pipe, and the liquid-phase refrigerant in the separation vessel passes through the lower liquid-phase refrigerant outflow pipe to the evaporator. be guided.

On the other hand, Patent Document 2 also discloses a similar liquid separator.
Like Patent Document 1, the liquid separator disclosed in Patent Document 2 has a closed container formed vertically as a whole. At the bottom of the closed container, there are a first pipe for flowing the gas-liquid two-phase fluid into the closed container, a second pipe for discharging the gas in the closed container to the outside, and a second pipe for discharging the liquid in the closed container to the outside. 3 pipes are connected.

Japanese Patent Application Laid-Open No. 2015-172469 Japanese Patent Application Laid-Open No. 2013-120028

In the cooling systems shown in Patent Documents 1 and 2, the compressor is positioned above the accumulator, and gravity causes the liquid-phase refrigerant to return to the accumulator.
Therefore, if the accumulator is vertically long and the compressor is arranged above the accumulator, the upper part of the liquid separator is heavy and the center of gravity is high. As a result, the liquid separator is in an unstable state, and there has been a desire to provide a new technique to improve this point.

The present invention has been made in view of the circumstances described above. Accordingly, the present invention provides a liquid separator, a cooling system, and a gas-liquid separation method that can stably place a compressor on top of a closed vessel.

In order to solve the above problems, the present invention proposes the following means.
A liquid separator according to a first aspect of the present invention comprises a cylindrical sealed container in which a refrigerant is stored, a refrigerant inflow pipe for inflowing the refrigerant into the closed container, and a gas phase refrigerant in the space inside the closed container. and a refrigerant outflow pipe for flowing out to the outside, the refrigerant inflow pipe and the refrigerant outflow pipe are arranged from the upper part of the closed container toward the inside of the container, and the closed container has a height relative to the diameter is configured to form a relatively small short cylinder.

A second aspect of the present invention includes an evaporator that absorbs ambient heat by evaporating a liquid-phase refrigerant along a refrigerant flow path, a compressor that compresses the gas-phase refrigerant, and a high pressure by the compressor. A cooling system comprising: a condenser that releases heat from a cooled refrigerant to condense a gaseous refrigerant; and a pressure reducing expansion valve that decompresses and expands the liquid refrigerant cooled by the condenser, the cooling system being upstream of the compressor. is provided with a liquid separator for gas-liquid separation of the refrigerant after passing through the evaporator. and a refrigerant outflow pipe through which the refrigerant in the space inside the closed container flows out to the outside, and the closed container has a short cylindrical shape whose height is relatively small relative to its diameter. configured as

A gas-liquid separation method according to a third aspect of the present invention includes a refrigerant inflow pipe for inflowing a refrigerant into a cylindrical sealed container in which the refrigerant is stored, and a refrigerant outflow pipe for flowing out the refrigerant in the space inside the sealed container to the outside. are connected to each other, and the closed container is formed into a short cylindrical shape whose height is relatively small with respect to its diameter.

ADVANTAGE OF THE INVENTION According to this invention, even if it arrange|positions the compressor which has a weight above a liquid separator, a liquid separator can be hold|maintained in a stable state.

1 is a configuration diagram showing a cooling system including a liquid separator according to an embodiment of the invention; FIG. 1 is a configuration diagram showing a cooling system including a liquid separator according to a first embodiment of the present invention; FIG. 1 is a perspective view showing a liquid separator according to a first embodiment; FIG. FIG. 4 is a longitudinal sectional view showing the internal configuration of the liquid separator shown in FIG. 3; FIG. 4 is a diagram for explaining the action of a splash prevention plate provided in the liquid separator shown in FIG. 3; FIG. 5B is a perspective view showing the splash prevention plate shown in FIG. 5A; It is a perspective view which shows the modification 1 of a splash prevention board. It is a perspective view which shows the modification 2 of a splash prevention board. It is a sectional view showing a liquid separator concerning a 2nd embodiment. It is a perspective view which shows the liquid separator which concerns on 3rd Embodiment. FIG. 11 is a configuration diagram showing a cooling system including a liquid separator according to a third embodiment;

A liquid separator 10 according to an embodiment of the present invention will be described with reference to FIG.
The liquid separator 10 is located upstream of the compressor 3 in the cooling system 1, and is provided for gas-liquid separation of the refrigerant after passing through the evaporator 2, for example.
This cooling system 1 includes an evaporator 2, a compressor 3, a condenser 4, and a pressure reducing expansion valve 5 along a refrigerant flow path 1A. The evaporator 2 absorbs surrounding heat by evaporating the liquid-phase refrigerant. The compressor compresses gas phase refrigerant. The condenser 4 releases the heat of the refrigerant that has been pressurized by the compressor 3 and condenses (or forcibly compresses) the vapor-phase refrigerant. A pressure reducing expansion valve 5 expands the liquid-phase refrigerant supplied from the condenser 4 .

A liquid separator 10 located on the upstream side of the compressor 3 has a tubular sealed container 11 in which the refrigerant C is stored. A refrigerant inflow pipe 12 into which a gaseous medium or a gas-liquid two-phase refrigerant flows, and a refrigerant outflow pipe 13 through which the gaseous refrigerant in the sealed container 11 is discharged to the outside are provided in the closed container 11 .

The refrigerant inflow pipe 12 and the refrigerant outflow pipe 13 are respectively installed from the upper surface 11A of the sealed container 11 toward the inside 11B of the container. The refrigerant inflow pipe 12 and the refrigerant outflow pipe 13 are arranged with a mutual distance as large as possible in the radial direction (R direction) of the sealed container 11 .
The closed container 11 of the liquid separator 10 has a relatively small height h relative to the diameter along the R direction, and is configured to have a short cylindrical shape as a whole.
In such a liquid separator 10, since the sealed container 11 is formed in a short cylindrical shape, even if the heavy compressor 3 is arranged on the upper surface 11A of the sealed container 11, the upper part of the liquid separator 10 can be The liquid separator 10 can be held in a stable state by avoiding the so-called top-heavy.

In such a vapor compression cooling system 1, the vapor-phase refrigerant evaporated by absorbing the heat H1 from the heat source in the evaporator 2 is separated into gas and liquid in the liquid separator 10, and then compressed in the compressor 3. , is sent to the condenser 4 . Thereafter, the liquid-phase refrigerant condensed by releasing heat H2 to the cold heat source in the condenser 4 is decompressed to a predetermined pressure by the decompression expansion valve 5 and sent to the evaporator 2 again.
Here, the liquid-phase refrigerant may not evaporate sufficiently in the evaporator 2 due to a decrease in the load of the heat source, a failure of the pressure reducing expansion valve 5, or the like, and may be supplied to the compressor 3 as a gas-liquid mixed flow. The phenomenon in which the liquid is supplied to the compressor 3 in this manner is called liquid backflow. If the liquid is supplied to the compressor 3, it may cause performance deterioration or failure of the compressor 3. In order to prevent this, the liquid separator 10 according to the embodiment of the present invention separates the liquid from the gas-liquid mixed flow after passing through the evaporator 2 and supplies only the gas to the compressor 3. there is

As described above, in the liquid separator 10 according to the embodiment of the present invention, the sealed container 11 is formed in a short cylindrical shape having a relatively small height (h) with respect to the radial direction (R direction). formed. Therefore, the height of the entire cooling system can be reduced, and even if the heavy compressor 3 is arranged on the upper surface 11A of the closed container 11, the entire apparatus can be installed in a stable state without becoming top-heavy. can.
Further, in the liquid separator 10, the sealed container 11 is formed in a short cylindrical shape. Therefore, the coolant inflow pipe 12 and the coolant outflow pipe 13 can be arranged on the upper surface 11A of the sealed container 11 at sufficient intervals in the radial direction (R direction).
As a result, in the liquid separator 10, the influence of the turbulence of the liquid surface of the refrigerant caused by the inflow of the refrigerant from the refrigerant inflow pipe 12 into the closed container 11 affects the refrigerant flowing out of the refrigerant outflow pipe 13. can be prevented. Therefore, it is possible to prevent the liquid-phase refrigerant in the sealed container 11 from being rolled up and flowing out of the refrigerant outflow pipe 13 .

(First embodiment)
A liquid separator 200 according to a first embodiment of the present invention will be described with reference to FIGS. 2 to 7. FIG.
This liquid separator 200 is installed in the cooling system F.
Cooling system F, as shown in FIG. , a liquid separator 200 , a compressor 300 , a condenser 400 and a pressure reducing expansion valve 500 . The evaporator 100 absorbs ambient heat H1 by evaporating the liquid-phase refrigerant. The liquid separator 200 separates the refrigerant into gas and liquid. Compressor 300 compresses the gas-phase refrigerant discharged from liquid separator 200 . The condenser 400 releases the heat of the refrigerant pressurized by the compressor 300 to condense the vapor phase refrigerant. The decompression expansion valve 500 decompresses and expands the liquid-phase refrigerant cooled by the condenser 400 .

The refrigerant supplied from the pressure reducing expansion valve 500 through the refrigerant flow path 650 absorbs the heat H1 from the heat source in the evaporator 100 and evaporates. The vaporized gaseous refrigerant passes through the refrigerant channel 610 , the liquid separator 200 and the refrigerant channel 620 in order and is sent to the compressor 300 .
The gas-phase refrigerant compressed to a high temperature and high pressure by the compressor 300 is sent to the condenser 400 via the refrigerant flow path 630, where heat is released H2 to the cold heat source and condensed.
After that, the liquid-phase refrigerant condensed in the condenser 400 moves through the refrigerant passage 640 to the pressure reducing expansion valve 500 and is reduced to a predetermined pressure. After that, the liquid-phase refrigerant is sent to the evaporator 100 again through the refrigerant flow path 650 .

Here, the liquid separator 200 is arranged on the upstream side of the compressor 300 and has a role of preventing the liquid phase refrigerant from being sucked into the compressor 300 .
Since the compressor 300 is designed to compress gas-phase refrigerant, it is known that if it is mixed with liquid-phase refrigerant, it will lead to failure (called liquid backflow phenomenon). Typically, the refrigerant is completely evaporated in the evaporator 100 to only vapor phase refrigerant. However, in the evaporator 100, if a disturbance such as a decrease in heat load occurs, the refrigerant may not evaporate and some of the liquid-phase refrigerant may remain. In that case, this liquid phase refrigerant is sent to the refrigerant channel 610 . Therefore, the liquid separator 200 separates the liquid-phase refrigerant contained in the refrigerant and supplies only the gas-phase refrigerant to the downstream compressor 300 .

As long as there are no restrictions on installation, it is preferable to construct the coolant channel 620 by avoiding a structure having a reverse gradient with respect to the direction of gravity or a U-shaped structure. This is because if such a reverse gradient structure or U-shaped structure exists in the refrigerant flow path 620, the condensed liquid-phase refrigerant stays in the refrigerant flow path 620 when the cooling system F is stopped. . As described above, the liquid-phase refrigerant staying in the refrigerant flow path 620 is sucked into the compressor 300 together with the gas-phase refrigerant when the cooling system F is started next time. , may cause a liquid backflow phenomenon in the compressor 300 .

3 and 4, the liquid separator 200 located upstream of the compressor 300 has a cylindrical housing 210 that serves as a sealed container in which refrigerant is stored. Inside the housing 210, a refrigerant inflow pipe 220 for inflowing a gas-phase refrigerant or a two-phase gas-liquid refrigerant and a refrigerant outflow pipe 230 for flowing out the gas-phase refrigerant in the housing 210 are installed.

Refrigerant inflow pipe 220 and refrigerant outflow pipe 230 are installed from upper surface 210A of housing 210 toward container interior 210B. The refrigerant inflow pipe 220 and the refrigerant outflow pipe 230 are arranged at intervals in the radial direction (R direction) of the housing 210 . The refrigerant inflow pipe 220 is connected to a refrigerant channel 610 through which the gas-phase refrigerant or gas-liquid two-phase refrigerant from the evaporator 100 is guided. Refrigerant outflow pipe 230 is connected to refrigerant channel 620 that guides the gaseous refrigerant to compressor 300 .
After passing through the evaporator 100, the gas-phase refrigerant or gas-liquid two-phase refrigerant flows into the housing 210 through the refrigerant inflow pipe 220, and the liquid-phase refrigerant in the gas-liquid mixture flows to the bottom of the housing 210 by gravity. fall and stay. Meanwhile, the gas-phase refrigerant in the gas-liquid mixed flow is sent to the compressor 300 through the refrigerant outflow pipe 230 .

The housing 210 of the liquid separator 200 has a relatively small height h relative to the diameter along the R direction, and is configured to have a short cylindrical shape as a whole.
As described above, in the liquid separator 200, the housing 210 is formed in a short cylindrical shape in which the height h is relatively small with respect to the diameter in the R direction. Even if a heavy compressor 300 is arranged, the compressor 300 can be held in a stable state.

Referring to FIG. 2 again, in the vapor compression cooling system F as described above, the vapor phase refrigerant evaporated by absorbing the heat H1 from the heat source in the evaporator 2 is compressed by the compressor 300 to become high temperature and high pressure. , is sent to the condenser 400 . Thereafter, the liquid-phase refrigerant condensed by the condenser 400 radiating heat H2 to the cold heat source is decompressed to a predetermined pressure by the decompression expansion valve 500 and sent to the evaporator 100 again.

Below inlet 220A (opening for liquid to flow into liquid separator 200) of refrigerant inflow pipe 220, air supplied through refrigerant inflow pipe 220 is provided, as shown in FIGS. A mesh-like splash prevention plate 240 is installed to prevent the phase refrigerant C1 from blowing up the liquid-phase refrigerant C2 staying in the housing 210 .
In the housing 210, when the flow velocity of the gas-phase refrigerant C1 supplied through the refrigerant inflow pipe 220 is high, the momentum of the gas-phase refrigerant C1 causes the housing 210 to move even if the refrigerant C1 is not mixed with the liquid-phase refrigerant. There is a possibility that the liquid-phase refrigerant C2 staying on the bottom surface is blown up. In this case, the blown-up liquid-phase refrigerant C2 may flow out from the outlet (opening for the liquid to flow out from the housing 210) 230A of the refrigerant outflow pipe 230. FIG.
Therefore, as shown in FIGS. 5A and 5B, a mesh-like splash prevention plate 240 is installed below the coolant inflow pipe 220 . The mesh-like splash prevention plate 240 mitigates the impact of the gas-phase coolant C1 on the liquid surface of the liquid-phase coolant C2, thereby preventing the liquid-phase coolant C2 from blowing up.

As described above, in the liquid separator 200 according to the first embodiment, the housing 210 is formed in a short cylindrical shape with a relatively small height h relative to the radial direction (R direction). Even if the heavy compressor 300 is arranged on the upper surface 210A of the housing 210, the compressor 300 can be stably held without being top-heavy.
Further, in the liquid separator 200, the housing 210 is formed in a short cylindrical shape. and a coolant outflow tube 230 can be arranged.
As a result, in the liquid separator 200, the influence of the waving (turbulence) of the liquid surface of the liquid-phase refrigerant C2 caused by the inflow of the refrigerant from the refrigerant inflow pipe 220 into the housing 210 affects the refrigerant outflow pipe 230. to prevent Therefore, it is possible to prevent the liquid-phase refrigerant C<b>2 in the housing 210 from blowing up and flowing out of the refrigerant outflow pipe 230 .

Furthermore, in the liquid separator 200, a mesh-like splash prevention plate 240 is provided below the inlet 220A of the refrigerant inflow pipe 220 to reduce the impetus of the gas-phase refrigerant C1 colliding with the liquid surface, This prevents the liquid surface of the liquid phase refrigerant C2 from waving. This also prevents the liquid-phase refrigerant C2 in the housing 210 from flowing out from the outlet 230A of the refrigerant outflow pipe 230. As shown in FIG.

Further, in the liquid separator 200, there is no complicated structure that causes a large pressure loss in the flow path of the gas-phase refrigerant from the refrigerant inflow pipe 220 to the refrigerant outflow pipe 230. FIG. As a result, in the liquid separator 200, while suppressing pressure loss during gas-liquid separation of the refrigerant, the so-called liquid back phenomenon to the compressor 300 (due to the liquid droplets flowing through the flow path with kinetic energy) , cooling system pipelines and equipment damage).

(Modification 1)
In the above embodiment, a mesh plate is used as the splash prevention plate 240, but the present invention is not limited to this. That is, as the splash prevention plate 240, a plate having a large number of through holes 240a as shown in FIG. 6, for example, a plate with a plurality of holes such as punching metal may be used.

(Modification 2)
Furthermore, as the splash prevention plate 240, a net-like body formed by entangling a plurality of fibers 240b as shown in FIG.

(Second embodiment)
A liquid separator 200' according to a second embodiment of the present invention will be described with reference to FIG.
The liquid separator 200' according to the second embodiment differs in configuration from the liquid separator 200 according to the first embodiment in that a liquid entry prevention plate 250 is provided below the outlet of the refrigerant outflow pipe 230. .

In the liquid separator 200' shown in the second embodiment, when the flow velocity of the gas-phase refrigerant C1 is high, the force to blow up the liquid-phase refrigerant C2 stored in the housing 210 is strong, and the splash prevention plate 240 alone There is a risk that the prevention of scattering of droplets will be insufficient. For this reason, in the liquid separator 200', in addition to providing the splash prevention plate 240 below the inlet (outlet toward the liquid separator 200') 220A of the refrigerant inflow pipe 220, the outlet of the refrigerant outflow pipe 230 ( Below the port 230A to which the liquid from the liquid separator 200' is directed, a liquid intrusion prevention plate 250 is provided to prevent suction of the liquid phase refrigerant C2.

Accordingly, in the liquid separator 200′ shown in the second embodiment, the droplets of the liquid-phase refrigerant C2 are sucked into the refrigerant outflow pipe 230 by adding the liquid intrusion prevention plate 240 below the refrigerant inflow pipe 220. can be prevented, and the liquid separation function can be improved.
As the liquid intrusion prevention plate 240, in addition to a normal plate, a mesh-like plate shown in FIG. A net-like body (or cotton-like body) formed by entangling fibers can also be used.

(Third embodiment)
A liquid separator 200″ according to a third embodiment of the present invention will be described with reference to FIGS. 9 and 10. FIG.

The liquid separator 200″ shown in the third embodiment differs in configuration from the liquid separators 200 and 200′ shown in the first and second embodiments in that the liquid level sensor 260, the maintenance valve 270 and the controller 700 The point is that

In normal operation of the cooling system, the gas refrigerant is completely sent from the outlet of the evaporator 100, and only when the operation becomes unstable due to disturbance, the liquid phase refrigerant is transferred from the evaporator 100 to the liquid separator 200. sent to At this time, the liquid-phase refrigerant C2 that has accumulated in the housing 210 due to the unstable operation gradually evaporates to become the gas-phase refrigerant C1 during the subsequent normal operation, and the accumulation is eliminated.

However, if unstable operations continue to occur, it is expected that the amount of liquid-phase refrigerant C2 remaining in housing 210 of liquid separator 200 will gradually increase.
For this reason, in the liquid separator 200″ shown in the third embodiment, as shown in FIG. 210 is installed.
If the liquid level of the liquid-phase refrigerant C2 remaining in the housing 210 becomes higher than the position of the splash prevention plate 240, the splash prevention plate 240 will not function, and the liquid separation function may be significantly reduced. is expected.
In this case, the liquid-phase refrigerant C2 may flow out from the refrigerant outflow pipe 230 and cause liquid backflow, so it is necessary to stop the compressor 300 .

Therefore, in the liquid separator 200″ of the third embodiment, the value of the liquid level sensor 260 of the liquid separator 200 is monitored as shown in FIG. In this case, a controller 700 is provided to stop the entire cooling system F' including the compressor 300. FIG.
Then, in the liquid separator 200″ of the third embodiment, after the cooling system F′ is stopped, the maintenance valve 270 at the bottom of the housing 210 is opened to release the stagnant liquid phase refrigerant C2, thereby restoring the normal state. can do.
The maintenance valve 270 may be opened and closed manually by an operator, or may be opened and closed by a drive means operated by a control unit 700 provided separately.

As described above, the embodiment of the present invention has been described in detail with reference to the drawings, but the specific configuration is not limited to this embodiment, and design changes and the like are included within the scope of the present invention.

This application claims priority based on Japanese Patent Application No. 2019-55600 filed in Japan on March 22, 2019, the content of which is incorporated herein.

INDUSTRIAL APPLICABILITY The present invention is mainly used in a cooling system and can be applied to a liquid separator, a cooling system, and a gas-liquid separation method for separating liquid flowing into a compressor from an evaporator, and a compressor having a weight on the upper part of the liquid separator. Even when arranged, the liquid separator can be held in a stable state. .

REFERENCE SIGNS LIST 1 cooling system 1A refrigerant flow path 2 evaporator 3 compressor 4 condenser 5 pressure reducing expansion valve 10 liquid separator 11 sealed container 12 refrigerant inflow pipe 13 refrigerant outflow pipe 100 evaporator 200 liquid separator 200′ liquid separator 200″ liquid Separator 210 Case 240 Splash Prevention Plate 250 Liquid Intrusion Prevention Plate 260 Liquid Level Sensor 270 Maintenance Valve 300 Compressor 400 Condenser 500 Decompression Expansion Valve 610 Refrigerant Channel 620 Refrigerant Channel 630 Refrigerant Channel 640 Liquid Pipe 650 Liquid Pipe 700 Control unit C Refrigerant C1 Gas-phase refrigerant C2 Liquid-phase refrigerant F Cooling cycle F' Cooling cycle R Radial direction

Claims (8)

A cylindrical closed container in which a refrigerant is stored, a refrigerant inflow pipe for inflowing the refrigerant into the closed container, a refrigerant outflow pipe for outflowing the refrigerant that has flowed into the space in the closed container, and the refrigerant outflow pipe. a compressor that receives and compresses refrigerant from and is disposed above the closed vessel;
The refrigerant inflow pipe and the refrigerant outflow pipe are arranged from the upper part of the closed container toward the inside of the container,
The closed container has a short cylindrical shape with a relatively small height relative to the diameter,
A cooling system according to claim 1, wherein a splash prevention plate is installed near an outlet of the refrigerant inflow pipe located in the sealed container to prevent splashes of the refrigerant from scattering. A cylindrical closed container in which a refrigerant is stored, a refrigerant inflow pipe for inflowing the refrigerant into the closed container, a refrigerant outflow pipe for outflowing the refrigerant that has flowed into the space in the closed container, and the refrigerant outflow pipe. a compressor that receives and compresses refrigerant from and is disposed above the closed vessel;
The refrigerant inflow pipe and the refrigerant outflow pipe are arranged from the upper part of the closed container toward the inside of the container,
The closed container has a short cylindrical shape with a relatively small height relative to the diameter,
A cooling system according to claim 1, wherein a liquid intrusion prevention plate is provided near an entrance of the refrigerant outflow pipe located in the closed container to prevent intrusion of the liquid-phase refrigerant in the closed container. 2. The cooling system according to claim 1, wherein said splash prevention plate is composed of a mesh plate. 2. The cooling system according to claim 1, wherein said splash prevention plate is composed of a plate having a large number of through holes. 2. The cooling system according to claim 1, wherein said splash prevention plate is composed of a net-like body formed by entangling a plurality of fibers. The airtight container is provided with a liquid level sensor for detecting the height of the liquid level of the liquid refrigerant, and a control section for stopping the entire apparatus when the detected value of the liquid level sensor exceeds a predetermined limit value. The cooling system according to any one of claims 1 to 5, characterized in that: The cooling system according to any one of claims 1 to 5, wherein a discharge valve for discharging the liquid-phase refrigerant is provided at the bottom of the closed container. Along the refrigerant flow path, there are an evaporator that absorbs surrounding heat by evaporating a liquid-phase refrigerant, a compressor that compresses the refrigerant, and a gas-phase refrigerant that releases the heat of the refrigerant that has been pressurized by the compressor. A cooling system comprising a condenser for condensing and a decompression expansion valve for decompressing and expanding the liquid phase refrigerant cooled by the condenser,
A liquid separator is provided on the upstream side of the compressor for gas-liquid separation of the refrigerant after passing through the evaporator,
The liquid separator includes a cylindrical closed container in which a refrigerant is stored, a refrigerant inflow pipe that allows the refrigerant to flow into the space inside the closed container, and a refrigerant outflow that allows the refrigerant in the space inside the closed container to flow out to the outside. and a pipe, wherein the closed container is configured to have a short cylindrical shape with a relatively small height relative to the diameter,
A cooling system, wherein the compressor is mounted on the closed container.

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