JP5844661B2 - Gas-liquid separator - Google Patents

Description

  The present invention is arranged in an evaporation pipe passage that communicates between the inside of a fuel tank and a canister disposed outside the fuel tank, and prevents liquid fuel that flows in along with fuel vapor from flowing to the canister side. This relates to a gas-liquid separator.

  For example, a fuel tank of an automobile is provided with a cut valve that prevents liquid fuel in the fuel tank from leaking out of the fuel tank when the automobile turns or tilts.

  The cut valve includes a case having an opening and a float valve disposed in the case. When the liquid fuel in the fuel tank is tilted or swings and is immersed in the float valve, the float valve is caused by buoyancy. Ascending and closing the opening of the case prevents external leakage of fuel.

  However, depending on the degree of tilting and swinging of the liquid fuel, before the float valve of the cut valve rises and closes the opening of the case, the liquid fuel enters from the opening and flows into the canister outside the fuel tank. There is a case.

  In order to prevent such a situation, the evaporative pipe passage that connects the inside of the fuel tank to the canister outside the fuel tank prevents the liquid fuel from flowing into the canister and allows the fuel vapor to flow into the canister. A gas-liquid separator is provided.

  As a conventional gas-liquid separation device of this type, in Patent Document 1 below, a casing having a gas-liquid separation chamber, an inlet provided at the lower part of the casing and connecting the gas-liquid separation chamber to a fuel tank, Provided in the upper part on the tip end side of the casing, the outlet for connecting the gas-liquid separation chamber to the canister, and the liquid fuel in the gas-liquid separation chamber for flowing out the liquid fuel to the outlet The thing provided with the control member to control is described. The restricting member is disposed between the inlet and the outlet, and has a V-shaped first rib that opens from the outlet to the inlet, and projects in a C shape from both sides of the inner wall of the casing. It is comprised from a pair of 2nd rib in which a part overlaps the both ends of a rib.

Japanese Patent No. 4492441

  In the gas-liquid separation device of Patent Document 1 described above, when the vehicle is tilted so that the outlet is below the inlet and liquid fuel flows into the gas-liquid separation chamber, it is surrounded by the first rib and the second rib. The liquid fuel stays in the open space.

  However, since a gap is formed between the V-shaped first rib and the pair of second ribs having a C shape, the liquid fuel flows from the gap when the vehicle is largely inclined. Then, there is a possibility that the liquid fuel is accumulated on the front end side of the casing, and the accumulated liquid fuel flows into the outlet formed on the inner wall surface on the front end side of the casing and flows to the canister side.

  Accordingly, an object of the present invention is to provide a gas-liquid separator that can more effectively prevent liquid fuel from flowing into the opening of an outlet pipe communicating with a canister.

  In order to achieve the above object, the present invention provides a liquid fuel that is disposed in an evaporation pipe passage that communicates between a fuel tank and a canister disposed outside the fuel tank. Is a gas-liquid separation device for preventing the gas from flowing into the casing, wherein the lower casing and the upper casing are joined to each other, and a casing main body forming a gas-liquid separation chamber therein is communicated with the gas-liquid separation chamber An inlet pipe provided in the lower casing and connected to a pipe communicating with the fuel tank, and a pipe provided in the upper casing so as to communicate with the gas-liquid separation chamber and connected to the canister An outlet pipe to be connected; and a first barrier for preventing liquid fuel flowing in from the inlet pipe from flowing into an opening in the gas-liquid separation chamber of the outlet pipe, The barrier is erected in a frame shape so as to surround the opening of the outlet pipe from the bottom surface of the lower casing toward the upper casing, and communicates the inside and outside of the frame portion of the first barrier. A gap is formed.

  In the gas-liquid separation device of the present invention, the lower casing and the upper casing have a shape in which a square shape or a square corner portion is chamfered in plan view, and the lower casing and the upper casing are It is preferable that the mounting angle of the upper casing can be changed.

  In the gas-liquid separation device of the present invention, the first barrier is formed in a frame shape by arranging a plurality of L-shaped wall portions in plan view through the gaps between the wall portions. It is preferable that the gaps that are configured and provided at opposing positions are formed at positions that are offset from each other.

  In the gas-liquid separation device of the present invention, the second barrier is provided on the inner surface of the top wall of the upper casing so as to project toward the lower casing so as to at least partially surround the opening of the outlet pipe. Is preferably formed.

  In the gas-liquid separator of the present invention, a recess is formed in the bottom surface of the lower casing, an opening in the gas-liquid separation chamber of the inlet pipe is formed in a side wall of the recess, and the inlet pipe is connected to the lower casing. It is preferable that it extends in a substantially horizontal direction.

  According to the present invention, since the opening in the gas-liquid separation chamber of the outlet pipe is surrounded by the frame-shaped first barrier, the liquid in the fuel tank can be caused by vehicle inclination, rapid acceleration / deceleration, turning, etc. Even if liquid fuel flows into the casing body due to tilting or swinging of the fuel, the liquid fuel collides with the first barrier and changes its path, so that it reaches the opening in the gas-liquid separation chamber of the outlet pipe. It is possible to effectively prevent the liquid fuel from flowing into the opening of the outlet pipe and flowing to the canister side.

  Further, even if the liquid fuel enters the inside of the frame-shaped first barrier, it can flow out to the outside through the gap and can be returned to the fuel tank through the inlet pipe.

  Furthermore, by providing the inlet pipe in the lower casing and the outlet pipe in the upper casing, it becomes easier to arrange the inlet pipe at the lower side and the outlet pipe at the upper side, making it difficult for liquid fuel to flow into the outlet pipe. In addition, the liquid fuel that has flowed into the gas-liquid separation chamber can be easily returned from the inlet pipe into the fuel tank.

It is a perspective view which shows one Embodiment of the gas-liquid separator which concerns on this invention. The component of the same gas-liquid separator is shown, (a) is a perspective view at the time of seeing an upper casing from the back surface side, (b) is a perspective view of a lower casing. It is a top view of the same gas-liquid separator. It is sectional drawing in the AA arrow line of FIG. 3 of the same gas-liquid separator. It is a schematic block diagram of the fuel tank to which the same gas-liquid separator is applied. In the same gas-liquid separator, it is a top view which shows the state which changed the attachment angle of the upper casing with respect to the lower casing. It is explanatory drawing which shows the other shape of the casing main body which comprises the same gas-liquid separator. It is explanatory drawing which shows the other shape of the 1st barrier provided in the same gas-liquid separator. The other embodiment of the gas-liquid separator which concerns on this invention is shown, (a) is a bottom view of the upper casing which comprises the gas-liquid separator, (b) is a BB arrow line of (a). FIG.

  Hereinafter, an embodiment of the gas-liquid separator of the present invention will be described with reference to FIGS.

  As shown in FIG. 5, the gas-liquid separation device 10 in this embodiment is attached to the inside of the fuel tank 1, and communicates the inside of the fuel tank 1 with the canister 2 disposed outside the fuel tank 1. It arrange | positions in the middle of the evaporation piping channel | path 3 to be made. The evaporation pipe passage 3 includes a pipe 3 a for connecting the gas-liquid separator 10 to the cut valve 4 and a pipe 3 b for connecting the gas-liquid separator 10 to the canister 2. Although not particularly illustrated, the cut valve 4 includes a case in which an opening is formed and a float valve disposed in the case so as to be movable up and down. A check valve 5 for adjusting the internal pressure of the fuel tank 1 is arranged in the middle of the pipe 3b.

  As shown in FIG.1 and FIG.4, the gas-liquid separation apparatus 10 of this embodiment joins the lower casing 30 and the upper casing 20, and has the casing main body 15 which forms the gas-liquid separation chamber R inside. Have.

  First, the upper casing 20 will be described. As shown in FIGS. 1 and 2 (a), the upper casing 20 in this embodiment includes a substantially square top wall 21, a peripheral wall 23 suspended downward from the periphery of the top wall 21, and It has a flange portion 25 that spreads outward from the outer periphery of the lower end of the peripheral wall 23. Further, the peripheral wall 23 and the flange portion 25 have a substantially square shape corresponding to the shape of the top wall 21 and have four corner portions chamfered in an R shape.

  As shown in FIGS. 1 and 4, the upper casing 20 is provided with a cylindrical outlet pipe 29 that communicates with the gas-liquid separation chamber R of the casing body 15. The outlet pipe 29 has a base side disposed inside the upper casing 20 (see FIG. 2A), and a tip end side protruding from the outer wall surface of the peripheral wall 23 of the upper casing 20 with a predetermined length. (See FIG. 1). As shown in FIG. 4, the outlet pipe 29 in the present embodiment has a shape extending obliquely downward from the base side toward the tip side.

  An opening 29a in the gas-liquid separation chamber R on the base side of the outlet pipe 29 is arranged at substantially the center of the top wall 21 of the upper casing 20 (FIG. 2A and FIG. 4). As shown in FIGS. 4 and 5, a pipe 3 b communicating with the canister 2 is connected to the tip of the outlet pipe 29, whereby the gas-liquid separation chamber R of the gas-liquid separation device 10 communicates with the canister 2. It is like that.

  An opening 29a in the gas-liquid separation chamber R on the base side of the outlet pipe 29 is arranged at substantially the center of the top wall 21 of the upper casing 20 (FIG. 2A and FIG. 4). As shown in FIGS. 4 and 5, a pipe 3 b communicating with the canister 2 is connected to the tip of the outlet pipe 29, whereby the gas-liquid separation chamber R of the gas-liquid separation device 10 communicates with the canister 2. It is like that.

  Next, the lower casing 30 will be described. As shown in FIG. 2 (b), the lower casing 30 in this embodiment has a shape suitable for the above-described upper casing 20, and includes a substantially square bottom wall 31 and a peripheral edge of the bottom wall 31. It has a peripheral wall 33 that hangs upward, and a flange portion 35 that extends outward from the outer periphery of the upper end of the peripheral wall 33 in a frame shape and joins the flange portion 25 of the upper casing 20. The peripheral wall 33 and the flange portion 35 have a substantially square shape corresponding to the shape of the bottom wall 31, and have four corner portions chamfered in an R shape.

  The “chamfering” in the present invention means that corners of the upper casing 20 and the lower casing 30 are processed into a predetermined shape, and the corners are not only processed into an R shape as described above, but also the corners. This includes processing the part obliquely at a predetermined angle (for example, 45 °).

  By the way, in the present embodiment, the lower casing 30 and the above-described upper casing 20 have a square shape and a corner portion that is chamfered in an R shape. For example, the shape shown in FIG. Good.

  That is, the upper casing 20 and the lower casing 30 are formed in a pentagonal shape with corners chamfered in an R shape (see FIGS. 7A and 7B), or in a hexagonal shape in which corners are chamfered in an R shape. (See FIGS. 7C and 7D) or a circular shape (see FIGS. 7E and 7F). In addition to this, the casings 20 and 30 may have a rectangular shape, a shape in which both ends of the rectangle are rounded, an elliptical shape, a triangular shape, or the like, and are not particularly limited.

  As shown in FIG. 4, the predetermined portion of the bottom wall 31 of the lower casing 30 has a shape protruding in a box shape from the outer surface of the bottom wall, and is parallel to one side surface of the peripheral wall 33 inside the protruding portion. An elongated rectangular recess 38 is formed (see FIG. 3). A pair of inlet pipes 39, 39 arranged in parallel with each other are provided so as to be substantially horizontal from the outer surface of the protruding portion where the recess 38 is formed.

  As shown in FIG. 4, the opening 39 a of each inlet pipe 39 is formed in the side wall of the recess 38, and the pair of inlet pipes 39, 39 are connected to the casing body through the openings 39 a, 39 a and the recess 38. It communicates with 15 gas-liquid separation chambers R. Further, pipes 3 a and 3 a communicating with the cut valve 4 are connected to the pair of inlet pipes 39 and 39, respectively. Through these cut valves 4, the gas-liquid separation chamber R and the fuel tank 1 of the gas-liquid separation device 10 are connected. It is designed to communicate with each other.

  In the gas-liquid separation device 10, as shown in FIG. 2 (b), the inside of the gas-liquid separation chamber R of the outlet pipe 29 is directed from the inner surface of the bottom wall 31 of the lower casing 30 toward the upper casing 20. A first barrier 41 having a frame shape is erected so as to surround the opening 29a.

  The first barrier 41 in this embodiment is a quadrangular frame shape that is formed by combining four wall portions 43 that are L-shaped in plan view, and are disposed between the wall portions 43 with a predetermined gap 45 therebetween. In addition, the gaps 45, 45 provided at the opposed positions are formed at positions displaced from each other (see FIGS. 2B and 3). In addition, each gap 45 is arranged so as to be displaced with respect to the opening 29 a of the outlet pipe 29 provided in the substantially central portion of the upper casing 20.

  Further, as shown in FIG. 4, the frame-shaped first barrier 41 extends so as to be positioned below the inner surface of the top wall 21 of the upper casing 20, and the upper end portion of the first barrier 41 and the upper casing 20. A predetermined gap 47 is formed between the inner surface of the top wall 21. Note that when the upper casing 20 is attached to the lower casing 30, the first barrier 41 is not formed so that the upper end portion of the first barrier 41 is brought into contact with the top wall inner surface of the upper casing 20 to form the gap 47. It may be erected.

  Moreover, although the 1st barrier 41 in this embodiment made the square frame shape combining four L-shaped wall parts 43, it is not limited to this, As a shape shown to Fig.8 (a)-(e) Also good.

  The first barrier 41 a shown in FIG. 8A has a rectangular frame shape in which four flat wall portions 43 are combined and a gap 45 is provided between the wall portions 43 and 43. A plurality of reinforcing ribs 44 project from the side surface of each wall portion 43.

  The first barrier 41b shown in FIG. 8B has a cylindrical frame shape by combining four wall portions 43 formed in an arc shape with the same width.

  The first barrier 41c shown in FIG. 8 (c) is arranged so as to face the arcuate wall portions 43a, 43a arranged opposite to each other and to a position orthogonal to these, and wider than the wall portion 43a. It has a frame shape composed of wall portions 43b and 43b formed in an arc shape.

  The first barrier 41d shown in FIG. 8 (d) has three flat plate-like wall portions 43 arranged in a U-shape and an arc shape arranged on the opening side of the U-shaped portion formed by these wall portions 43. The frame part which consists of the wall part 43c is comprised.

  The first barrier 41e shown in FIG. 8 (e) is formed of a pair of arcuate wall portions 43, 43 arranged opposite to each other, and has a frame shape in which both end portions are displaced from each other. There is no.

  In addition to the above shape, the frame-shaped first barrier 41 may be rectangular, elliptical, pentagonal, hexagonal, or the like, and is not particularly limited.

  Next, the effect of the gas-liquid separator 10 having the above structure will be described.

  First, a method for attaching the gas-liquid separator 10 to the fuel tank 1 will be described. First, the flange portion 25 of the upper casing 20 is aligned with the flange portion 35 of the lower casing 30 having a frame shape and brought into contact with each other, and the flange portions 25, 25 are joined by joining means such as ultrasonic welding and hot plate welding. 35 are joined together. Thereby, the upper casing 20 is attached to the lower casing 30 at a predetermined angle, and the casing main body 15 in which the gas-liquid separation chamber R is defined is configured. The joining means may be an adhesive or the like and is not particularly limited.

  In this embodiment, the axial direction of the outlet pipe 29 with respect to the axial direction of the inlet pipe 39 is the same, and the direction in which the inlet pipe 39 and the outlet pipe 29 protrude opposite to each other, that is, the direction of the outlet pipe 29 with respect to the inlet pipe 39. The upper casing 20 is attached to the lower casing 30 so that the angle is 180 degrees (see FIGS. 1 and 3).

  Further, in this embodiment, the lower casing 30 and the upper casing 20 have a shape in which square corners are chamfered in plan view, and, for example, as shown in FIG. The upper casing 20 can be attached to the lower casing 30 so that the angle of the pipe 29 is 90 degrees, and the attachment angle of the upper casing 20 with respect to the lower casing 30 can be appropriately changed.

  Since the angle of the outlet pipe 29 with respect to the inlet pipe 39 can be changed by changing the mounting angle of the upper casing 20 with respect to the lower casing 30 in this way, piping connected to the inlet pipe 39 and the outlet pipe 29 The degree of freedom of the layouts 3a and 3b can be increased, and versatility for the fuel tank 1 can be increased. In the case of this embodiment, the attachment angle of the upper casing 20 with respect to the lower casing 30 can be appropriately changed in four directions at intervals of 90 degrees.

  Moreover, when the upper casing 20 and the lower casing 30 are pentagonal shapes with corners chamfered in an R shape, the upper casing 20 can be attached to the lower casing 30 in five directions at intervals of 72 degrees (see FIG. 7 (a) and (b)), in the case of a hexagonal shape whose corners are chamfered in an R shape, the upper casing 20 can be attached to the lower casing 30 in six directions at intervals of 60 degrees (FIG. 7). In the case of a circular shape, the upper casing 20 can be attached to the lower casing 30 at an arbitrary angle of 360 degrees (see FIGS. 7E and 7F).

  The pipes 3a and 3a connected to the cut valve 4 are connected to the pair of inlet pipes 39 and 39, respectively, and the pipe 3b connected to the canister 2 and connected to the check valve 5 in the middle is connected to the outlet pipe 29. After connection, gas-liquid separation is performed on the ceiling surface of the fuel tank 1 via a mounting bracket (not shown) (when the fuel tank 1 is made of metal), welding (when the fuel tank 1 is made of resin), or other attachment means. The device 10 can be mounted (see FIGS. 4 and 5). Note that the pipes 3 a and 3 b may be connected to the inlet pipe 39 and the outlet pipe 29 after the gas-liquid separator 10 is attached to the fuel tank 1.

  At this time, in this embodiment, since the pair of inlet pipes 39, 39 extend from the outer surface of the lower casing 30 in a substantially horizontal direction, the entire gas-liquid separator 10 can be configured to be thin and compact. The installation space inside the fuel tank 1 can be reduced. Even when the gas-liquid separator 10 is disposed outside the fuel tank 1, the installation space can be reduced.

  Further, since the outlet pipe 29 extends obliquely downward from the outer surface of the upper casing 20, the pipe 3b connected to the outlet pipe 29 can be made difficult to interfere with the ceiling surface of the fuel tank 1, and the gas-liquid After the separation device 10 is attached to the fuel tank 1, the pipe 3 b can be easily connected to the outlet pipe 29.

  The liquid fuel in the fuel tank 1 tilts or swings due to the inclination of the vehicle, sudden acceleration / deceleration, turning, etc., and before the float valve of the cut valve 4 closes the opening, the pipe 3a is used. Even if the liquid fuel passes through the opening 39 a and the recess 38 of the inlet pipe 39 and flows into the gas-liquid separation chamber R, in this gas-liquid separator 10, the frame is formed so as to surround the opening 29 a of the outlet pipe 29. Since the first barrier 41 having a shape is erected, the liquid fuel that has flowed into the gas-liquid separation chamber R collides with the frame-shaped first barrier 41 and changes its path, so that the outlet pipe 29 The liquid fuel can be made difficult to reach the opening 29a, and the liquid fuel can be effectively prevented from flowing into the opening 29a of the outlet pipe 29 and flowing to the canister 2 side through the pipe 3b.

  Further, in this embodiment, since the opening 29a of the outlet pipe 29 is disposed at the substantially central portion of the top wall 21 of the upper casing 20, the gas-liquid separation chamber can be used regardless of whether the vehicle is inclined in the front, rear, left, or right direction. The liquid fuel that has flowed into R can be made difficult to reach the opening 29a of the outlet pipe 29, and can be prevented from flowing to the canister 2 side.

  Further, since the gap 45 is formed in the frame-shaped first barrier 41, when the liquid fuel flows into the gas-liquid separation chamber R as described above, the liquid fuel enters the first barrier 41 from the gap 45. However, when the inclination of the vehicle returns to the horizontal level or when sudden acceleration / deceleration or turning is finished, the liquid fuel can flow out of the first barrier 41 through the gap 45, and the inlet pipe 39, the pipe 3a, the cut valve The liquid fuel can be returned into the fuel tank 1 via 4.

  Further, by providing the inlet pipe 39 in the lower casing 30 and the outlet pipe 29 in the upper casing 20, the inlet pipe 39 can be more easily disposed at the lower side and the outlet pipe 29 can be disposed at the upper side. It is possible to make it difficult to flow into the opening 29 a of the outlet pipe 29, and it is possible to easily return the liquid fuel that has flowed into the gas-liquid separation chamber R into the fuel tank 1 from the inlet pipe 39.

  Furthermore, in this embodiment, since each wall part 43 which comprises the 1st barrier 41 was formed so that it may make L shape in planar view, the intensity | strength of the wall part 43 can be raised and durability can be improved. it can. Further, since the gaps 45, 45 provided at the opposed positions are formed at positions deviated from each other (see FIGS. 2B and 3), the entrance of the liquid fuel passage in the first barrier 41. In addition, the position of the outlet can be displaced, and the liquid fuel can be prevented from passing across the first barrier 41.

  In this embodiment, since the recess 38 is formed on the inner surface of the bottom wall of the lower casing 30 and the opening 39a of the inlet pipe 39 is formed on the side wall of the recess 38, the gas-liquid separation chamber R Since the liquid fuel that has flowed into the tank accumulates in the recess 38, the liquid fuel can easily flow into the opening 39a of the inlet pipe 39, and the liquid fuel can be easily returned to the fuel tank 1.

  When the pressure in the fuel tank 1 increases, the fuel vapor in the fuel tank 1 flows into the gas-liquid separation chamber R through the cut valve 4, the pipe 3 a, and the inlet pipe 39, and Through the gap 45 and the gap 47 between the first barrier 41 and the upper casing 20, the gas flows into the opening 29 a of the outlet pipe 29, flows out into the canister 2 through the check valve 5 and the pipe 3 b, and enters the fuel tank 1. The pressure is reduced.

  On the other hand, when the pressure in the fuel tank 1 falls below a predetermined value, the external air becomes the canister 2, the pipe 3b, the check valve 5, the outlet pipe 29 of the gas-liquid separator 10, the gas-liquid separation chamber R, the recess 38, the inlet The gas passes through the pipe 39, the pipe 3a, and the cut valve 4 and flows into the fuel tank 1, so that the pressure in the fuel tank 1 increases. At this time, the liquid fuel accumulated in the gas-liquid separation chamber R is also returned into the fuel tank 1 through the inlet pipe 39.

  FIG. 9 shows another embodiment of the gas-liquid separation device of the present invention. Note that substantially the same parts as those of the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.

  In the gas-liquid separator 10a of this embodiment, a second barrier 48 protrudes from the inner surface of the top wall 21 of the upper casing 20 toward the lower casing 30 so as to surround the opening 29a of the outlet pipe 29. Has been.

  As shown in FIG. 9A, the second barrier 48 of this embodiment is substantially U-shaped in a plan view, and a predetermined gap 50 is formed from the base end portion of the outlet pipe 29 so that the first barrier 41 It is arrange | positioned so that it may become a position substantially aligned with a part of. A predetermined gap 49 is formed between the lower end of the second barrier 48 and the upper end of the first barrier 41 (see FIG. 9B), and fuel vapor is emitted from the gap 49 and the gap 50. It can flow.

  According to this embodiment, the liquid fuel that flows in from the inlet pipe 39 and flows in the gas-liquid separation chamber R collides not only with the first barrier 41 but also with the second barrier 48. It is possible to make it difficult for fuel vapor to reach the opening 29a of the pipe 29, and it is possible to more effectively prevent liquid fuel from flowing into the opening 29a of the outlet pipe 29 and flowing to the canister 2 side.

DESCRIPTION OF SYMBOLS 1 Fuel tank 2 Canister 3 Evaporative piping passages 10 and 10a Gas-liquid separator 15 Casing main body 20 Upper casing 21 Top wall 29 Outlet pipe 29a Opening 30 Lower casing 31 Bottom wall 38 Recessed part 39 Inlet pipe 39a Opening 41, 41a, 41b, 41c, 41d, 41e 1st barrier 43, 43a, 43b, 43c Wall 45 Gap 47 Gap 48 Second barrier R Gas-liquid separation chamber

Claims (5)

Gas-liquid separation for preventing liquid fuel flowing together with the fuel vapor from flowing to the canister side, which is disposed in an evaporation pipe passage that communicates the inside of the fuel tank and the canister disposed outside the fuel tank. A device,
A casing body formed by joining a lower casing and an upper casing, and forming a gas-liquid separation chamber therein;
An inlet pipe provided in the lower casing so as to communicate with the gas-liquid separation chamber, and connected to a pipe communicating with the fuel tank;
An outlet pipe provided in the upper casing so as to communicate with the gas-liquid separation chamber, and connected to a pipe communicating with the canister;
A first barrier for preventing liquid fuel flowing in from the inlet pipe from flowing into the opening in the gas-liquid separation chamber of the outlet pipe;
The first barrier is erected in a frame shape so as to surround the opening of the outlet pipe from the bottom surface of the lower casing toward the upper casing, and inside and outside of the frame-shaped portion of the first barrier A gas-liquid separation device characterized in that a gap for communicating is formed.   The lower casing and the upper casing have a quadrangular shape or a rectangular corner portion chamfered in plan view so that the mounting angle of the upper casing can be changed with respect to the lower casing. The gas-liquid separator according to claim 1, which is configured.   The first barrier is formed in a frame shape by arranging a plurality of L-shaped wall portions in a plan view through the gaps between the wall portions, and is provided at opposed positions. The gas-liquid separator according to claim 1 or 2, wherein the gap is formed at a position displaced from each other.   The top wall of the upper casing is provided with a second barrier projecting toward the lower casing so as to at least partially surround the periphery of the opening of the outlet pipe. The gas-liquid separator as described in any one of these.   A recess is formed in the bottom surface of the lower casing, an opening in the gas-liquid separation chamber of the inlet pipe is formed in a side wall of the recess, and the inlet pipe extends from the lower casing in a substantially horizontal direction. The gas-liquid separator according to any one of claims 1 to 4.