JP7003758B2 - Gas-liquid separator - Google Patents

Description

The present invention relates to, for example, the art of a gas-liquid separator used to separate water from the gas discharged from the anode of a fuel cell.

As a gas-liquid separator having the above configuration, Patent Document 1 includes an inlet pipe at the upper part of a cylindrical main body portion, a drainage pipe at the lower part of the main body portion, and a filter at an upper position of the drainage pipe inside the main body portion. The technology provided is described.

In Patent Document 1, the posture is set so that the inlet pipe supplies gas tangentially to the main body portion, and the outlet pipe is provided at the center position of the upper surface of the main body portion. Further, the filter is configured by insert-molding a wire mesh with a resin having an outer diameter substantially equal to the inner diameter of the main body.

In Patent Document 1, the exhaust gas introduced from the inlet pipe is separated into gas and water by the cyclone effect in the main body, and the separated water is filtered by a filter to discharge the water from which foreign substances have been removed. ..

Further, as the gas-liquid separator having the above configuration, Patent Document 2 includes a gas-liquid separator main body having a water storage portion at the lower portion, and the gas-liquid separator main body has an introduction port and an outlet at a position higher than the water storage portion. The technology with is described.

In Patent Document 2, a vertical wall-shaped collision wall is provided at an intermediate position between an inlet and an outlet inside the main body of the gas-liquid separator, and a bounce reduction plate is provided above the water storage portion. From this configuration, the gas introduced from the inlet collides with the collision wall to separate water, the separated water is stored in the water storage section, and the gas after colliding with the collision wall and separating the water is guided. It is discharged from the outlet.

Further, as a gas-liquid separator having the above configuration, Patent Document 3 includes a suction pipe at the upper part of the chamber, a discharge pipe at the upper surface of the chamber, a drain pipe at the lower end of the chamber, and a screen (filter) inside the chamber. The technology provided is shown.

In Patent Document 3, the chamber is composed of an upper vortex chamber and a lower collection chamber, and a screen is arranged between them. The suction tube is configured to create a vortex in the chamber and separate water from the fluid by supplying the fluid tangentially to the vortex chamber. In this configuration, the water separated from the fluid is filtered through a screen and then drained from the drain pipe.

Japanese Patent Application Laid-Open No. 2002-373698 JP-A-2017-147159 Japanese Unexamined Patent Publication No. 2016-72183

A gas-liquid separator having a water storage unit inside may be equipped with an electromagnetic on-off valve that opens the valve body by driving an electromagnetic solenoid in order to discharge water from the water storage unit at an arbitrary timing.

Considering the configuration of the on-off valve, the contact surface of the valve body is brought into contact with the opening of the flow path housing to block the flow path of the flow path housing, and the valve body is separated from the flow path housing. It is also possible to assume that the flow path is opened to discharge water. When an on-off valve with this configuration is used for a gas-liquid separator, assuming a situation in which fine particle-like foreign matter is contained in the water stored in the water storage section, the valve body comes into contact with the valve body in the open position. Foreign matter sometimes adhered to the surface.

When foreign matter adheres to the contact surface of the valve body, even if the valve body reaches the closed position from the open position, the fine particle foreign matter is caught between the contact surface of the valve body and the flow path housing. In some cases, the flow of water could not be completely blocked, and a small amount of water was continuously discharged.

In addition, considering the reuse of water discharged from the gas-liquid separator, if the water contains fine particle-like foreign matter, the foreign matter stays on the inner surface of the pipe and supplies water. In some cases, it adhered to the inside of the pump and impaired the smooth operation of the pump.

In order to solve this problem, it is conceivable to provide a filter for filtering the water separated by the gas-liquid separator inside the gas-liquid separator on the upstream side of the water storage unit. In particular, in this configuration, reducing the area (opening) of the eyes of the filter (increasing the mesh) is effective in removing fine particle-like foreign substances contained in water.

However, when a filter with a large mesh (small opening) is used, the eyes of the filter are blocked with water, and the gas in the space below this filter (space in the water storage section) is above the filter. Since it does not escape into the space, it causes a phenomenon that water does not pass through the eyes of the filter.

That is, when the opening of the filter is small, the opening of the filter is easily closed by the surface tension of water. Immediately after the filter's eyes are closed, the gas pressure in the space below the filter (water storage space) is equal to the gas pressure in the space above the filter (internal space of the gas-liquid separator). .. After that, when water collects in the eyes of the filter, some water falls into the water storage part due to gravity while the eyes of the filter are closed, and the amount of water stored increases, while the gas in the space above the filter does not pass through the filter. As it remains, the pressure in the space below the filter rises. When the pressure in the space below the filter exceeds a predetermined value, the water stored in the filter will not fall due to the pressure difference from the pressure in the space above. In this way, if the eyes of the filter are closed, gas cannot pass through the eyes of the filter, and as a result, water cannot pass through, which may lead to insufficient gas-liquid separation. ..

For this reason, there is a demand for a gas-liquid separator capable of filtering water separated from gas with a filter and storing it in a water storage unit even if the size of the filter is small.

The characteristic configuration of the gas-liquid separator according to the present invention is a housing having a gas-liquid separation unit that separates water from the introduced water-containing gas and a water storage unit that stores the water separated by the gas-liquid separation unit. It is provided with a filtration unit that removes foreign substances contained in the water contained in the housing and sent from the gas-liquid separation unit to the water storage unit.
The filtration unit is arranged above the water storage unit, and includes a filter that separates the gas-liquid separation unit and the water storage unit, and a communication tube that allows gas to flow from the lower side to the upper side of the filter. There is a point.

According to this feature configuration, the filter of the filtration unit has a small opening, and even in a situation where the eyes are closed by water due to surface tension, the communication cylinder allows gas to flow from the lower side to the upper side of the filter, so that it is better than the filter. The pressure in the lower space can be the same as the pressure in the space above the filter, allowing the phenomenon of water filtering through the eyes of the filter.
As a result, a gas-liquid separator capable of filtering the water separated from the gas with the filter and storing it in the water storage unit was constructed even if the size of the filter was small.

As another configuration, the filtration unit may be integrally formed with a net material constituting the filter, a frame supporting the net material, and the communication cylinder protruding upward from the frame.

According to this, since the frame that supports the net material and the communication cylinder are integrally formed, it is necessary to set the frame and the communication cylinder separately even if the filtration unit is provided inside the gas-liquid separator. This makes it easier to assemble the gas-liquid separator.

As another configuration, the housing has a lower housing in which the water reservoir and the filtration unit are supported, and an upper housing arranged so as to cover the lower housing, and
The filtration unit may be supported in a state of being fitted from the upper side to the lower side with respect to the lower housing, and the upper end of the communication cylinder may be arranged at a position close to or in contact with the lower surface of the wall portion of the upper housing. ..

According to this, when the filtration unit is fitted into the lower housing and supported, and the upper housing is set at a position covering the lower housing, the upper end of the communication cylinder is close to or abuts on the lower surface of the wall portion of the upper housing. This makes it possible to suppress the floating of the filtration unit. This makes it possible to omit the step for fixing the filtration unit when assembling the gas-liquid separator.

As another configuration, the filtration unit may include a plurality of the communication tubes.

According to this, the gas in the space below the filter is surely flowed to the space above the filter by the plurality of communication cylinders, and the water in the filter can be easily filtered.

It is a perspective view of a gas-liquid separator. It is a vertical sectional side view of a gas-liquid separator. It is a perspective view of a filtration unit. It is a cross-sectional plan view of the part including the introduction port in the bulging wall part. It is a cross-sectional plan view of the intermediate part of a bulging wall part. It is a vertical sectional side view of the gas-liquid separator of another embodiment (a). It is a perspective view of the filtration unit of another embodiment (a). It is a vertical sectional side view of the gas-liquid separator of another embodiment (b). It is a vertical sectional side view of the gas-liquid separator of another embodiment (c). It is a perspective view of the filtration unit of another embodiment (c). It is a perspective view of the filtration unit of another embodiment (d).

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Main unit configuration]
As shown in FIGS. 1 and 2, a housing 10 having a water-containing gas introduction port 1, a water-containing gas discharge port 2, a gas-liquid separation unit 3, a flow-down guide unit 4, and a water storage unit 5 is provided. The gas-liquid separator A is configured with an electromagnetic on-off valve 6 for discharging the water stored in the water storage unit 5.

This gas-liquid separator A introduces the water-containing gas discharged from the anode of the fuel cell into the inside of the housing 10 from the introduction port 1 in a vehicle traveling by the electric power of the solid polymer fuel cell (not shown). The gas-liquid separation unit 3 separates water from the water-containing gas and stores it in the water storage unit 5, and the gas separated from the water is discharged from the discharge port 2.

In other words, in a solid polymer fuel cell, fuel gas, which is a mixture of hydrogen gas and nitrogen gas, is humidified and supplied to the anode, and oxidant gas (air containing oxygen) is supplied to the cathode to generate power. Will be done. The reason for humidifying the fuel gas is to moisten the anode, and the (water-containing gas) gas discharged from the anode includes nitrogen gas, unreacted hydrogen gas, and water.

For this reason, in this type of vehicle, water is separated from the water-containing gas discharged from the anode and stored in the water storage unit 5, and the gas-liquid separator is used as a reduction path for returning the separated gas to the anode of the fuel cell. It has an A.

In the fuel cell having this configuration, since the amount of water stored in the water storage unit 5 can be estimated from the amount of power generation, the amount of water in the water storage unit 5 is estimated by a control device such as an ECU based on the amount of power generation. Based on this estimation, the control device controls the electromagnetic on-off valve 6 to control the discharge of water. The gas-liquid separator A may be provided with a sensor for detecting the amount of water stored in the water storage unit 5, and may be configured to open the electromagnetic on-off valve 6 based on the detection result of this sensor.

〔housing〕
The gas-liquid separator A is provided in the vehicle in a posture in which a vertical relationship is set as shown in FIGS. 1 and 2. The housing 10 has an upper housing 11 and a lower housing 15, and an internal space is formed by joining the upper flange 11f of the upper housing 11 and the lower flange 15f of the lower housing 15 with a plurality of bolts 7. .. It should be noted that the structure is such that the introduction port 1 and the discharge port 2 communicate with each other with respect to the internal space of the housing 10, and the discharge flow path 17a communicates with the water storage unit 5.

The upper housing 11 and the lower housing 15 are made of resin, and a sealing material is sandwiched between the interface between the upper flange 11f and the lower flange 15f. The upper housing 11 and the lower housing 15 may be formed of a metal such as aluminum.

An introduction port 1 and a discharge port 2 are formed in the upper housing 11 with the water storage portion 5 interposed therebetween in a plan view, and the discharge port 2 is formed so as to penetrate the upper housing 11 in the vertical direction. Further, in the upper housing 11, a bulging wall 12 that bulges upward is integrally formed, and a separation space 3S is formed inside the bulging wall 12. Further, an introduction port 1 is formed at the upper end portion of the bulging wall 12, and the gas-liquid separating portion 3 is arranged in the separation space 3S inside the bulging wall 12.

As shown in FIGS. 2, 4, and 5, the bulging wall 12 has an inner wall that is circular in a plan view, so that the separation space 3S is formed as a columnar space. The gas-liquid separation unit 3 integrally forms a plurality of collision walls 3a (six in the figure) along the inner wall of the bulging wall 12, and the water-containing gas supplied from the introduction port 1 is supplied to the plurality of collision walls 3a. The water contained in the gas is separated as water droplets on the collision wall 3a by colliding with the water droplets, and the separated water is further dropped downward from the collision wall 3a by its own weight as water droplets.

The height of the introduction port 1 is set near the upper end of the plurality of collision walls 3a. The introduction posture of the introduction port 1 is set so as to send the water-containing gas diagonally downward as shown in FIG. 2 in the tangential direction along the inner circumference of the separation space 3S as shown in FIG. As a result, when the water-containing gas is introduced in the direction indicated by the arrow as the introduction path S in FIGS. 2 and 4, it turns in the separation space 3S inside the introduction cylinder 13 (counterclockwise in FIGS. 4 and 5). A swirl flow is created, and this swirl flow moves downward while swirling. It should be noted that the introduction port 1 may be set at a position higher than the position shown in FIG. 2 because the water separation performance is improved by setting the introduction port 1 at a position higher than the plurality of collision walls 3a.

As a specific configuration, the gas-liquid separation unit 3 is provided in the introduction path S of the introduction port 1 so that the water-containing gas supplied from the introduction port 1 to the separation space 3S first collides with one of the plurality of collision walls 3a. The positional relationship between the introduction direction and the collision wall 3a is set. Further, the angles of the plurality of collision walls 3a are set so that the water-containing gas that has collided flows toward the adjacent collision wall 3a. As a result, the water-containing gas supplied from the introduction port 1 to the separation space 3S sequentially collides with the plurality of collision walls 3a to change the flow direction, and creates a swirl flow swirling in the separation space 3S.

Therefore, when the water-containing gas is supplied to the separation space 3S from the introduction port 1, each time the water-containing gas collides with the collision wall 3a, the water contained in the water-containing gas becomes water droplets and adheres to the collision wall 3a. In addition, the flow of the water-containing gas is disturbed and the flow velocity decreases, so that the fine water contained in the water-containing gas is also separated. As a result, the water droplets fall downward by their own weight as the water path W in FIG. 2 and flow from the flow guide unit 4 to the water storage unit 5, and the gas in the state where the water droplets are separated is the gas flow G in FIG. As shown by the arrow, the water flows from the lower part of the separation space 3S toward the discharge port 2, and is discharged upward from the discharge port 2.

The lower housing 15 is provided with a bottomed cylindrical water storage portion wall 17 extending downward from the central portion. Further, in the lower housing 15, a flow-down wall 18 (specific configuration of the flow-down guide portion 4) having a lower inclined posture is formed in a portion closer to the water storage portion wall 17 on the lower side of the separation space 3S.

The water storage unit 5 is formed in a space surrounded by the water storage unit wall 17 and opened upward, and an electromagnetic on-off valve 6 is provided on the outer surface of the lower portion of the water storage unit wall 17. Further, the upper part of the water storage unit 5 is provided with a filtration unit F for removing foreign substances contained in water.

As shown in FIG. 2, a discharge flow path 17a is formed in the water storage portion wall 17. The electromagnetic on-off valve 6 includes a valve body 6a held at a position where the discharge flow path 17a is blocked by a spring-forced force, and an electromagnetic solenoid 6b that opens the valve body 6a against the spring-forced force by energization. It is configured. The discharge flow path 17a communicates with the drainage port 17b shown in FIG. 1, and when the electromagnetic on-off valve 6 is opened, the water in the water storage unit 5 is discharged from the drainage port 17b.

The electromagnetic on-off valve 6 is provided with a resin sealing film 6c that flexibly deforms at a portion of the valve body 6a that abuts on the water storage portion wall 17, and the valve body 6a is in the closed position shown in FIG. In this case, the sealing film 6c comes into contact with the discharge flow path 17a. Further, when the electromagnetic solenoid 6b is driven, the seal film 6c is configured to be separated from the discharge flow path 17a as the valve body 6a operates.

As shown in FIGS. 2 and 3, the filtration unit F is a resin annular frame 21 fitted into the water storage portion wall 17, and a net material stretched around the inner circumference of the annular frame 21 and using a metal wire or nylon. It is configured to include a circular filter 22 and a resin communication cylinder 25. The opening of the filter 22 is set to about 0.05 mm, and a ring-shaped seal 21a is fitted into the annular groove on the outer periphery of the annular frame 21.

The annular frame 21 is circular in a plan view, and the annular frame 21 is such that a part of the annular frame 21 is connected to the inner peripheral portion of the annular frame 21 at a position biased toward the discharge port 2 with respect to the center of the annular frame 21. The communication cylinder 25 is formed integrally with the 21. The filter 22 is provided by an insert when the annular frame 21 and the communication cylinder 25 are molded by a mold.

Since the communication cylinder 25 is formed by this mold forming, the lower end position of the communication cylinder 25 is set at a level corresponding to the lower end position of the annular frame 21, and the communication cylinder 25 is set in the region protruding upward from the lower end position. It is formed. Further, since the filter 22 has a circular shape, it is also arranged inside the communication cylinder 25.

As shown in FIG. 2, a rib 11a projecting downward is formed on the wall portion of the upper housing 11, and the amount of protrusion of the communication cylinder 25 is such that the upper end of the communication cylinder 25 abuts on the lower surface of the rib 11a. It is set. The positional relationship may be set so that the upper end of the communication cylinder 25 is close to the rib 11a.

In this filtration unit F, the seal 21a on the outer periphery of the annular frame 21 is brought into close contact with the inner circumference of the water storage portion wall 17, so that the water flowing from the down wall 18 is surely supplied to the filter 22.

[Action and effect of the embodiment]
From this configuration, when the water-containing gas is introduced from the introduction port 1 along the introduction path S, the introduced water-containing gas collides with the high position of the collision wall 3a and creates a swirl flow. When this swirl flow flows into the separation space 3S, the water-containing gas is continuously collided with the plurality of collision walls 3a, and the collision positions are sequentially moved downward to repeatedly collide with the plurality of collision walls 3a. The water contained in the water-containing gas can be efficiently separated.

Further, when the water contained in the water-containing gas collides with the collision wall 3a and adheres to the water-containing gas to form water droplets, the water droplets fall downward from the collision position along the water path W and flow down the wall 18 (flowing down). It is received by the guide unit 4) and flows along the flow-down wall 18 (along the water path W) to be stored in the water storage unit 5.

In this configuration, since the water droplets on the collision wall 3a do not directly fall on the water storage unit 5, the phenomenon that the water in the water storage unit 5 jumps up is prevented. Moreover, since the down wall 18 is formed in an oblique posture, the upper surface of the down wall 18 is always in a state where water flows, and the water droplets that have fallen on the down wall 18 come into contact with the flowing water. Even if kinetic energy is absorbed and droplets are generated from the dropped water droplets, the droplets do not bounce high, and the phenomenon that the water separated from the water-containing gas comes into contact with the gas again in the housing can be suppressed.

Further, since the filtration unit F is provided at the upper position of the water storage unit 5, not only can foreign matter in the form of fine particles be removed, but also the filter of the filtration unit F even if water droplets may fall directly on the water storage unit 5. Since it comes into contact with 22, it does not come into direct contact with the water stored in the water storage unit 5 again, and the water is not splashed up.

Then, since the foreign matter contained in the water is removed from the filter 22, the valve body 6a moves from the open position to the closed position even if the electromagnetic on-off valve 6 is configured to operate the valve body 6a by driving the electromagnetic solenoid 6b. At that time, there is no inconvenience that foreign matter contained in water is caught in the valve body 6a, and the electromagnetic on-off valve 6 can be operated properly.

Since the water-containing gas supplied from the introduction port 1 to the separation space 3S flows as a swirl flow in the separation space 3S, the gas reaching the separation space 3S easily flows in the horizontal direction and reaches the discharge port 2. It is discharged upward from the discharge port 2. As a result, the possibility that the separated water is sent to the inside of the housing 10 without approaching the water storage unit 5 is reduced, and the inconvenience that the separated water is contained in the gas again can be suppressed.

In particular, as compared with the gas-liquid separator A that separates water from the water-containing gas by the cyclone effect, in this configuration, there are no restrictions on the positions of the introduction port 1 and the discharge port 2 and the shape of the housing 10. Easy to design.

In this gas-liquid separator A, even if the water separated from the water-containing gas in the gas-liquid separation unit 3 by providing the communication cylinder 25 in the filtration unit F may reach the portion of the filter 22, the water communicates. It does not get inside the cylinder 25. Therefore, even if water adheres to the filter 22 outside the communication cylinder 25 and closes the eyes of the filter 22 due to surface tension, the state in which water does not adhere to the filter 22 inside the communication cylinder 25 is maintained. Therefore, the gas in the space below the filter 22 (hereinafter referred to as the lower space LS) and the gas in the space above the filter (hereinafter referred to as the upper space US) pass through the communication cylinder 25. The gas in the lower space LS and the gas in the upper space US can have the same pressure.

Further, in the assembled state of the gas-liquid separator A, the upper end of the communication cylinder 25 abuts on the rib 11a of the upper housing 11, so that the filtration unit F can be held at a fixed position.

As a result, even if a filter 22 having a small opening value is used, the water storage portion 5 does not fall into a sealed state due to the water adhering to the filter 22, and the portion of the filter 22 outside the communication cylinder 25 is watered. Can be well filtered and water can be sent to the water storage unit 5.

[Another Embodiment]
The present invention may be configured as follows in addition to the above-described embodiments (those having the same functions as those of the embodiments are designated by the same numbers and reference numerals as those of the embodiments).

(A) As shown in FIGS. 6 and 7, the filtration unit F is configured by arranging the communication cylinder 25 at a position where it rises from the center position of the filter 22. In the other embodiment (a), a plurality of reinforcing frame portions 21f are formed in the central direction from the annular frame 21, and a communication cylinder 25 is integrally formed with the plurality of reinforcing frame portions 21f.

Also in this other embodiment (a), since it is assumed that the annular frame 21 and the communication cylinder 25 are molded by the mold and the filter 22 is inserted at the time of molding, the lower end of the annular frame 21 is assumed. The position and the lower end position of the communication cylinder 25 are at the same level, and the filter 22 is also formed inside the communication cylinder 25.

Also in the configuration of the other embodiment (a), the protrusion amount of the communication cylinder 25 is set so that the upper end of the communication cylinder 25 abuts on the lower surface of the rib 11a of the wall portion of the upper housing 11. There is.

(B) As shown in FIG. 8, the configuration of the filtration unit F is basically the same as that of the other embodiment (a), and the filter 22 is not provided at the lower position inside the communication cylinder 25. A filter 22 is provided near the upper end of the communication cylinder 25.

In such a configuration in which the filter 22 is provided near the upper end of the communication cylinder 25, the phenomenon of water adhering to the filter 22 can be reliably suppressed. Therefore, the gas of the water storage unit 5 is sent out by the communication cylinder 25 to the water storage unit 5. Water can be sent in even better.

(C) As shown in FIGS. 9 and 10, the configuration of the filtration unit F is basically the same as that of the other embodiments (a) and (b), and the upper end of the communication cylinder 25 is in an inclined posture. By setting the shape to be cut, an elliptical upper opening 25a is formed, and further, the filter 22 is provided in the upper opening of the communication cylinder 25 without providing the filter 22 in the lower position inside the communication cylinder 25.

In this other embodiment (c), the inflow of gas is suppressed by setting the opening direction of the upper opening 25a to the downstream side in the direction in which the gas flows. Also in the configuration, the protrusion amount of the communication cylinder 25 is set so that the upper end of the communication cylinder 25 abuts on the lower surface of the rib 11a of the wall portion of the upper housing 11. Further, since the filter 22 having the upper opening 25a is arranged in an inclined manner, even if water adheres to the filter 22, the attached water flows downward on the surface of the filter 22 in the inclined posture and communicates with the communication cylinder. Since it flows downward along the outer circumference of the 25, the eyes of the filter 22 are not easily closed.

(D) As shown in FIG. 11, the filtration unit F is configured to include a plurality of communication tubes 25. Although the drawings show a pair of communication cylinders 25, there may be three or more communication cylinders 25. When a plurality of communication cylinders 25 are provided in this way, the filter 22 may be provided on either the lower portion or the upper end of the communication cylinder 25.

Also in this other embodiment (d), the upper end of each communication cylinder 25 is arranged so as to abut against the rib 11a of the upper housing 11. By providing the plurality of communication cylinders 25 in this way, the gas of the water storage unit 5 can be satisfactorily flowed upward, and the water filtered through the filter 22 can be satisfactorily flowed into the water storage unit 5.

The present invention can be used for a gas-liquid separator that removes water contained in a gas.

3 Air-liquid separation part 5 Water storage part 11 Upper housing 15 Lower housing 21 Frame (annular frame)
22 Filter 25 Communication cylinder F Filtration unit

Claims (4)

A housing having a gas-liquid separation unit that separates water from the introduced water-containing gas and a water storage unit that stores the water separated by the gas-liquid separation unit, and the water storage unit housed in the housing and from the gas-liquid separation unit. It is equipped with a filtration unit that removes foreign substances contained in the water sent to the unit.
The filtration unit is arranged above the water storage unit, and includes a filter that separates the gas-liquid separation unit and the water storage unit, and a communication tube that allows gas to flow from the lower side to the upper side of the filter. There is a gas-liquid separator. The gas-liquid separation according to claim 1, wherein the filtration unit is integrally formed with a mesh material constituting the filter, a frame supporting the mesh material, and a communication cylinder protruding upward from the frame. vessel. The housing has a lower housing in which the water reservoir and the filtration unit are supported, and an upper housing arranged so as to cover the lower housing.
A claim in which the filtration unit is supported in a state of being fitted from the upper side to the lower side with respect to the lower housing, and the upper end of the communication cylinder is arranged at a position close to or in contact with the lower surface of the wall portion of the upper housing. Item 2. The gas-liquid separator according to Item 1. The gas-liquid separator according to any one of claims 1 to 3, wherein the filtration unit includes a plurality of the communication tubes.

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