WO2020105508A1

WO2020105508A1 - Gas-liquid separation device with check valve

Info

Publication number: WO2020105508A1
Application number: PCT/JP2019/044336
Authority: WO
Inventors: 健太三原
Original assignee: 株式会社パイオラックス
Priority date: 2018-11-19
Filing date: 2019-11-12
Publication date: 2020-05-28
Also published as: JP7076573B2; JPWO2020105508A1

Abstract

A gas-liquid separation device with a check valve is provided in which, even if a liquid fuel flows towards the canister, the liquid fuel can be easily returned into the gas-liquid separation chamber. This gas-liquid separation device 10 with a check valve is arranged in a passage that connects a fuel cut-off device and a canister, and is for preventing liquid fuel that flows together with the fuel vapor from flowing towards the canister. The gas-liquid separation device has a casing 15, inside of which a gas-liquid separation chamber is formed, and a check valve 50. The casing 15 has a tank-side opening 28 which connects the fuel cut-off device and the gas-liquid separation chamber, and a canister-side opening 31 which connects the canister and the gas-liquid separation chamber. The check valve 50 has a connection pipe section 60 which is connected directly to the canister-side opening 31 and which constitutes part of the passage.

Description

Gas-liquid separator with check valve

According to the present invention, a liquid shutoff device that prevents a fuel from flowing out of a fuel tank and a canister that is disposed outside the fuel tank are disposed in a passage that communicates with each other. The present invention relates to a gas-liquid separation device with a check valve for preventing flow to the side.

For example, a fuel tank of a car is equipped with a cut valve that prevents the liquid fuel in the fuel tank from leaking to the outside of the fuel tank when the car turns or leans. This cut valve includes a case having an opening and a float valve arranged in the case. When the liquid fuel in the fuel tank tilts or rocks and is immersed in the float valve, the float valve moves up. The external leakage of fuel is prevented by closing the case opening.

However, depending on the degree of tilt or swing of the liquid fuel, the liquid fuel may enter through the opening and flow into the canister outside the fuel tank before the float valve of the cut valve rises to close the case opening. ..

In order to prevent such a situation, the passage that connects the canister inside the fuel tank and the canister outside the fuel tank blocks the inflow of liquid fuel into the canister, and at the same time permits the liquid vapor that allows the inflow of fuel vapor into the canister. A separating device is provided.

As a conventional gas-liquid separation device of this type, in Patent Document 1 below, a lower casing and an upper casing are joined together to form a gas-liquid separation chamber inside, and a lower casing is provided. , An inlet pipe connected to a pipe communicating with the inside of the fuel tank, an outlet pipe connected to a pipe communicating with the canister provided on the upper casing, and a liquid fuel flowing from the inlet pipe into a gas-liquid separation of the outlet pipe. A gas-liquid separation device is described, which comprises a first barrier preventing entry into an opening in the chamber. The upper casing is in the shape of a box having a ceiling wall and a peripheral wall extending from the peripheral edge of the upper wall, and an outlet pipe extends from the peripheral wall.

JP, 2013-177063, A

Regarding fuel systems for automobiles, it is necessary to consider the case where the vehicle rolls over or turns over due to an accident, for example. In this respect, for example, in the conventional gas-liquid separation device as disclosed in Patent Document 1 above, liquid fuel accumulates on the top wall of the upper case, and this liquid fuel flows into the pipe communicating with the canister through the outlet pipe. Even if the vehicle accumulates and the vehicle recovers from rollover or reversal, the liquid fuel may be difficult to return to the gas-liquid separation chamber.

Therefore, an object of the present invention is to provide a gas-liquid separation device with a check valve that can easily return to the gas-liquid separation chamber even if liquid fuel flows into the canister side.

In order to achieve the above-mentioned object, the present invention is arranged in a passage that communicates a fuel cutoff device for preventing the outflow of fuel in a fuel tank and a canister arranged outside the fuel tank, and is arranged together with fuel vapor. A gas-liquid separation device with a check valve for preventing the flowing liquid fuel from flowing to the canister side, which adjusts the pressure in the casing having a gas-liquid separation chamber formed therein and the fuel tank. The casing has a check valve, and the casing has a tank-side opening that connects the fuel cutoff device and the gas-liquid separation chamber, and a canister-side opening that connects the canister and the gas-liquid separation chamber. And the check valve has a connecting pipe portion that is directly connected to the canister-side opening and forms a part of the passage.

According to the present invention, the check valve has the connecting pipe portion that is directly connected to the canister-side opening of the casing and that forms a part of the passage that connects the gas-liquid separation chamber and the canister. A pipe for connecting the gas-liquid separation device and the check valve is not necessary, and liquid fuel is prevented from accumulating in the pipe so that the liquid fuel flowing out to the check valve side can be easily returned to the gas-liquid separation chamber. You can

It is an exploded perspective view showing one embodiment of a gas-liquid separation device with a check valve concerning the present invention. It is a schematic block diagram of a fuel tank to which the same gas-liquid separator is applied. It is a perspective view of a check valve which constitutes the gas-liquid separation device. FIG. 3 is an enlarged perspective view of the gas-liquid separation device with a check valve connected to the canister-side opening of the casing. It is sectional drawing of the same gas-liquid separator. It is sectional drawing which shows the state at the time of connecting a check valve to the casing main body which comprises the same gas-liquid separator. In the gas-liquid separation device, it is a cross-sectional view showing the operation of the check valve when the tank internal pressure increases. In the gas-liquid separation device, it is a cross-sectional view showing the operation of the check valve when the tank internal pressure is reduced. FIG. 3 is a cross-sectional view of the gas-liquid separation device when the vehicle is tilted. FIG. 3 is a cross-sectional view of the gas-liquid separation device in a state where the vehicle is reversed. It is sectional drawing which shows other embodiment of the gas-liquid separator with a check valve which concerns on this invention. It is an exploded perspective view showing further another embodiment of the gas-liquid separation device with a check valve concerning the present invention. The casing main body which comprises the gas-liquid separator is shown, (a) is the sectional view, (b) is sectional drawing in the AA arrow line of (a). It is sectional drawing in the arrow B line of FIG.13 (b). It is a perspective view of the cap which comprises the same gas-liquid separation device. In the gas-liquid separation device, the state where the valve case of the check valve is mounted on the support wall on the casing side is shown, (a) is an explanatory view thereof, and (b) is a plan view. It is explanatory drawing of the state which inserted the check valve into the canister side opening part of a casing from the state shown in FIG. It is explanatory drawing of the state which attached the cap to the opening part of the casing from the state shown in FIG. 17, and connected the check valve to the canister side opening part.

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

As shown in FIG. 2, the gas-liquid separator 10 with a check valve connects a fuel cutoff device 2 for preventing the fuel in the fuel tank 1 from flowing out and a canister 3 arranged outside the fuel tank 1. The liquid fuel is disposed in the passage 5 to prevent the liquid fuel flowing along with the fuel vapor from flowing to the canister 3 side. In addition, the passage 5 in this embodiment includes a pipe 5a connecting the gas-liquid separation device 10 and the fuel cutoff device 2, and a pipe 5b connecting the gas-liquid separation device 10 and the canister 3. The fuel cutoff device 2 is a so-called cut valve, and includes a case having an opening formed therein and a float valve arranged in the case so as to be able to move up and down, although not particularly shown.

As shown in FIGS. 1 and 5, a gas-liquid separator 10 with a check valve (hereinafter, also simply referred to as “gas-liquid separator 10”) in this embodiment is a casing in which a gas-liquid separation chamber R is formed. A gas-liquid separator with a check valve, which has a check valve 15 attached to the casing 15 and adjusting the pressure in the fuel tank 1.

Referring to FIG. 1, a casing 15 of this embodiment is mounted between a casing body 20 having a bottomed cylindrical shape with an open upper side and an opening 25 of the casing body 20, and between the casing body 20 and the casing body 20. It is composed of a cap 40 that defines a gas-liquid separation chamber R.

The casing body 20 is composed of a substantially disc-shaped bottom wall 21 and a substantially cylindrical peripheral wall 23 provided upright from the peripheral edge thereof. At the upper end of the peripheral wall 23 in the standing direction, a ring-shaped enlarged diameter portion 24 that extends in the outer diameter direction is provided. The inside of the expanded diameter portion 24 forms an opening 25 in which the cap 40 is mounted. A tapered surface 24a is formed on the inner circumference of the expanded diameter portion 24.

On the other hand, the cap 40 is a substantially disc-shaped base portion 41 formed with an outer diameter that matches the expanded diameter portion 24, and a back surface side (a surface side facing the casing body 20) of the base portion 41. And an annular projecting portion 43 having an annular shape and projecting slightly inward from the outer peripheral edge portion. In the cap 40, the annular protrusion 43 is brought into contact with the tapered surface 24a of the expanded diameter portion 24 of the casing main body 20 to perform adhesive bonding, ultrasonic welding, spin welding, hot plate welding, vibration welding, or the like. The taper surface 24a on the inner circumference of the enlarged diameter portion 24 can be fixed by means such as welding. Then, as shown in FIG. 5, the gas-liquid separation chamber R is defined in the casing 15 by fixing the cap 40 to the opening 25 of the casing body 20.

Returning to the description of the casing body 20 again, as shown in FIG. 6, on the bottom wall 21 side of the peripheral wall 23, at one position in the circumferential direction, a circular tank side passage 27a is formed. It is formed so as to communicate with the liquid separation chamber R. In addition, at a position near the opening 25 of the peripheral wall 23 and aligned in the circumferential direction with respect to the tank side communication port 27a, a circular canister side communication port 30a is formed. Is formed in communication with.

A tank-side connecting pipe 27 having a substantially cylindrical shape extends outward from the casing main body 20 from the front-side peripheral edge of the tank-side communication port 27 a of the peripheral wall 23, and the canister-side connecting pipe 27 of the peripheral wall 23 communicates with the tank-side connecting pipe 27. A canister-side connecting pipe 30 having a substantially cylindrical shape extends outward from the casing main body 20 from the front peripheral edge of the mouth 30a (see FIG. 6). Further, both connecting

pipes

27, 30 extend in the horizontal direction (direction orthogonal to the axial direction of the casing body 20) from the front side of the peripheral wall 23 so as to be parallel to each other. The inner diameter of the canister-side connecting pipe 30 is larger than the inner diameter of the tank-side connecting pipe 27, and the extension length is shorter than that of the tank-side connecting pipe 27.

As shown in FIG. 5, one end of a pipe 5a communicating with the fuel cutoff device 2 is attached to the outer periphery of the tank-side connecting pipe 27, and the pipe 5a and the tank-side connecting pipe 27 communicate with each other. It is supposed to do. That is, the internal space of the tank-side connection pipe 27 forms the tank-side opening 28 that connects the fuel cutoff device 2 and the gas-liquid separation chamber R.

On the other hand, as shown in FIG. 5, the connecting pipe portion 60, which will be described later, of the check valve 50, to which the pipe 5b communicating with the canister 3 is connected, is inserted from the outside of the opening on the tip end side in the extending direction of the canister side connecting pipe 30. Thus, the connecting pipe portion 60 is directly connected to the canister-side opening portion 31 (this aspect will be described in detail below). As a result, the pipe 5b communicating with the canister 3 and the canister-side connecting pipe 30 communicate with each other via the check valve 50. That is, the internal space of the canister-side connection pipe 30 forms the canister-side opening 31 that connects the canister 3 and the gas-liquid separation chamber R.

Further, a retaining bracket for preventing the connection pipe portion 60 inserted into the canister-side opening 31 and connected to the outer periphery of the canister-side connection pipe 30 from coming off from the canister-side opening 31. 32 are provided. As shown in FIG. 1, the retaining bracket 32 extends in a bifurcated manner from the front end of the canister-side connecting pipe 30 to a wall portion 32a standing upright, and from the front end of the wall portion 32a toward the outside of the casing. The holding

pieces

32b and 32b and the engaging

portions

32c and 32c protruding from the inside of the tip of each holding piece 32b.

The casing main body 20 in this embodiment has a bottomed cylindrical shape with an upper opening, but the casing main body 20 has, for example, a substantially quadrangular shape or a substantially oval shape when viewed two-dimensionally. The shape may be a box shape having a substantially oval shape (in this case, the cap has a substantially square plate shape, a substantially elliptical plate shape, or a substantially oval shape), and is not particularly limited. Further, the cap does not necessarily have to be attached to the casing body. Further, the casing may be composed of a box-shaped lower casing and an upper casing which are divided into upper and lower halves. Further, in this embodiment, the tank-side connecting pipe 27 and the canister-side connecting pipe 30 extend in the same direction toward the outside of the casing, but both connecting pipes extend in different directions in the circumferential direction of the casing. It may have been done. Further, both connecting pipes may extend obliquely with respect to the axial direction of the casing, and further, a plurality of both connecting pipes may extend with respect to the casing.

On the other hand, in the case of this embodiment, the check valve 50 attached to the casing 15 is, as shown in FIG. 1 and FIG. It is mainly composed of a positive pressure valve 70 that discharges fuel vapor to the outside of the tank when the pressure in 1 rises above a predetermined value. In this embodiment, the positive pressure valve 70 has a double structure in which the negative pressure valve 75 that opens when the inside of the fuel tank 1 becomes a negative pressure and introduces the outside air into the fuel tank 1 is arranged inside. It is a valve. The valve case 51 has a substantially cylindrical first case 53 having a wall portion at one end and an opening at the other end, and a lid-like second case fixed to the other end opening of the first case 53. It consists of a case 55.

As shown in FIG. 5, the first case 53 has a substantially disk-shaped wall portion 53a arranged on one end side thereof and a stepwise expanding diameter extending from the peripheral edge of the wall portion 53a. It has a substantially cylindrical cup shape having a substantially cylindrical peripheral wall 53b. In addition, a first vent hole 53c communicating with the inside of the valve case 51 is formed in the center of the wall portion 53a, and a connection pipe portion 60 having a substantially cylindrical shape is formed from the outer peripheral edge of the first vent hole 53c. Is extended.

Further, as shown in FIGS. 3 and 5, the tip end portion 61 of the connecting pipe portion 60 in the extending direction has a shape in which the outer circumference thereof is gradually reduced in diameter toward the tip of the connecting pipe portion 60. A ventilation part 63 communicating with the internal space of the connection pipe part 60 is formed on the upper surface side of the outer periphery of the tip part 61 (the side facing the opening 25 of the casing body 20 when the check valve 50 is connected to the casing 15). Has been done. As shown in FIG. 3, the ventilation part 63 of this embodiment is cut out in the shape of an elongated groove along the axial direction of the connection pipe part 60 and is formed up to the tip of the connection pipe part 60. The inner diameter side and the outer diameter side of the pipe portion 60 are opened, and the axial end of the connection pipe portion 60 is also formed in a slit shape. The ventilation part may have a hole shape or a notch shape instead of the groove shape as long as it can communicate the inside and outside of the connection pipe part 60. Further, a seal ring mounting groove 62 is formed on the outer periphery of the connecting pipe portion 60 on the base end side, and an annular seal ring 80 is mounted.

Then, as shown in FIG. 6, in the check valve 50, the connecting pipe portion 60 is inserted into the canister-side opening portion 31 from the outside of the casing 15, the canister-side connecting pipe 30 is passed therethrough, and the tip portion 61 thereof is inserted. It is pushed so as to project into the gas-liquid separation chamber R from the canister-side passage 30a. Further, the base end side of the connecting pipe portion 60 enters the canister-side connecting pipe 30, and the seal ring 80 mounted on the outer periphery thereof is pressed against the inner periphery of the canister-side connecting pipe 30 to cause the canister-side connecting pipe 30 to move. The connection pipe portion 60 is directly connected to the canister-side opening 31 by sealing the gap between the inner periphery and the outer periphery of the connection pipe portion 60 (see FIG. 5). In this way, the connecting pipe portion 60 directly connected to the canister-side opening 31 constitutes a part of the passage 5. That is, in this embodiment, the connection pipe portion 60 constitutes the “connection pipe portion which is directly connected to the canister-side opening and constitutes a part of the passage” in the present invention.

In the present invention, the term “the connecting pipe portion is directly connected to the canister-side opening” means that the connecting pipe portion of the check valve is indirectly connected to the canister-side opening portion through the pipe. It means that. In addition, in this embodiment, the seal rings 80 mounted on the outer periphery of the connection pipe portion 60 are brought into pressure contact with the canister-side opening 31 and the outer periphery of the connection pipe portion 60, respectively, and are connected via the seal ring 80, so to speak. Although the pipe portion 60 is directly connected to the canister-side opening portion 31, it is not limited to this mode. For example, the inner circumference of the canister-side opening is shaped such that the diameter thereof is gradually reduced toward the distal end side in the insertion direction of the connecting pipe portion, and the outer periphery of the connecting pipe portion is tapered so that the diameter is gradually reduced toward the distal end side. By welding the inner circumference of the canister-side opening with the outer circumference of the connecting pipe pressed, the connecting pipe can be directly connected to the canister-side opening, or the outer circumference of the connecting pipe and the canister-side opening can be connected. It is also possible to apply an adhesive between the connection pipe and the adhesive to directly connect the connecting pipe portion to the canister-side opening, and the connecting pipe portion is directly connected to the canister-side opening. It is not particularly limited.

Moreover, a retaining portion 57 is provided on the outer periphery of the first case 53 so as to project therefrom. As shown in FIGS. 3 and 5, the retaining portion 57 is sandwiched between the pair of retaining

pieces

32b and 32b of the retaining bracket 32, and a neck portion 57a that engages with the engaging

portions

32c and 32c. , A long plate-shaped presser plate portion 57b that is connected to the neck portion 57a and engages with the front sides of the holding

pieces

32b and 32b. Then, as described above, when the connecting pipe portion 60 is inserted from the outside of the canister side opening portion 31, the retaining portion 57 is aligned with the retaining bracket 32 of the casing body 20, and the check valve 50 is pushed in. As shown in FIGS. 4 and 5, the neck portion 57a of the retaining portion 57 is inserted by pushing the pair of holding

pieces

32b and 32b of the retaining bracket 32, and engaging the engaging

portions

32c and 32c. When the fitting plate portion 57b is fitted, the holding plate portion 57b is engaged with the front side of the pair of holding

pieces

32b, 32b to prevent the connecting pipe portion 60 from coming off from the canister-side opening portion 31, so that the connecting pipe portion 60 is retained and held. There is. In the state where the retaining bracket 57 is engaged with the retaining bracket 32, the neck portion 57a of the retaining portion 57 is arranged between the pair of holding

pieces

32b, 32b of the retaining bracket 32. On the other hand, the check valve 50 is also stopped.

Further, in this embodiment, as shown in FIG. 6, a length L1 along the axial direction of the connecting pipe portion 60 (from the surface of the wall portion 53a of the first case 53 to the tip of the connecting pipe portion 60). The length up to this point) is longer than the length L2 of the canister-side connecting pipe 30 (the length from the canister-side opening 30a to the tip end opening of the canister-side opening 31). As a result, as shown in FIG. 5, the connecting pipe portion 60 is inserted from the outside of the casing 15 into the canister-side opening portion 31, and the wall portion 53a of the first case 53 of the check valve 50 is inserted into the canister-side opening portion 31. In the state where the check valve 50 is pushed in until it comes into contact with the front side peripheral edge, the tip end portion 61 of the connecting pipe portion 60 in the extending direction projects into the gas-liquid separation chamber R. In this state, the tip portion 61 of the connecting pipe portion 60 is arranged at a position slightly beyond the radial center of the casing body 20, and the ventilation portion 63 formed at the tip portion 61 of the connecting pipe portion 60 is It is arranged to face the cap 40 side.

A valve seat 64 that communicates with the inside of the check valve 50 is provided on the base end side of the connecting pipe portion 60 (see FIG. 5). In this embodiment, an annular valve seat 64 is provided from a peripheral edge of the wall portion 53a of the first case 53 to which the proximal end side of the connection pipe portion 60 is connected (the side facing the inner side of the check valve) of the first ventilation port 53c. It is projected.

On the other hand, as shown in FIG. 5, the second case 55 has a lid-shaped wall portion 55a arranged so as to close the opening side of the peripheral wall 53b of the first case 53. A second vent 55c communicating with the inside of the valve case 51 is formed in the center of the wall 55a, and a substantially cylindrical connecting pipe 65 extends from the outer peripheral edge of the second vent 55c. I have put it out. As shown in FIG. 5, one end of a pipe 5b communicating with the canister 3 is connected to the outer periphery of the connecting pipe portion 65 so that the pipe 5b and the internal space of the check valve 50 communicate with each other. ing.

In the case of this embodiment, the positive pressure valve 70 slidably housed in the internal space of the check valve 50 is fixed to a substantially cylindrical support portion 71 having a reduced diameter at the tip and a base end opening portion of the support portion 71. And a substantially cylindrical holding portion 73.

Openings

71a and 73a are formed at the center of the tip of the support 71 and the center of the base of the holder 73 (see FIG. 5).

Further, the first biasing spring S1 is interposed between the positive pressure valve 70 and the wall portion 55a of the second case 55, whereby the tip end side of the support portion 71 of the positive pressure valve 70 is The valve seat 64 is constantly urged toward the valve seat 64 to close the valve seat 64 (see FIG. 5).

Then, when the internal pressure of the fuel tank 1 rises above a predetermined value, the fuel vapor flows into the gas-liquid separation chamber R through the tank-side connecting pipe 27 and the like, and also passes through the connecting pipe portion 60 to turn the positive pressure valve 70 on. Press. Then, as shown in FIG. 7, the positive pressure valve 70 as a whole slides in the direction away from the valve seat 64 against the urging force of the first urging spring S1, so that the valve seat 64 is opened and the connecting pipe portion 60 is opened. Fuel vapor is discharged to the outside of the fuel tank. As a result, the internal pressure of the fuel tank 1 can be reduced.

Further, in this embodiment, the negative pressure valve 75 is provided for introducing the outside air into the tank when the internal pressure of the fuel tank 1 becomes a negative pressure lower than a predetermined value. The negative pressure valve 75 is slidably arranged in the positive pressure valve 70, and a tip end surface of the negative pressure valve 75 comes into contact with and separates from the inside of the opening 73a of the holding portion 73. Further, the negative pressure valve 75 is constantly biased by the second biasing spring S2 so as to come into contact with the opening 73a of the holding portion 73 (see FIG. 5).

Then, when the inside of the fuel tank has a negative pressure with respect to the outside air pressure, as shown in FIG. 8, the negative pressure valve 75 is pressed by the outside air pressure, and resists the urging force of the first urging spring S1 to prevent the valve seat. Since it slides in the direction approaching 64, the opening 73 a of the holding portion 73 is opened accordingly. Then, the outside air passes through the positive pressure valve 70, the connecting pipe portion 60, and the like, flows into the gas-liquid separation chamber R, further passes through the tank side connecting pipe 27, and the like, and is introduced into the fuel tank. Is becoming As a result, the internal pressure of the fuel tank 1 can be increased.

Next, the operation and effect of the gas-liquid separation device 10 of the present invention having the above configuration will be described.

First, a method of connecting the check valve 50 to the casing 15 will be described. That is, as shown in FIG. 6, while aligning the connecting pipe portion 60 of the check valve 50 with the canister-side opening 31 of the casing body 20 having the cap 40 mounted in the opening 25, the check bracket 32 is checked. The retaining portion 57 of the valve 50 is aligned, and in that state, the check valve 50 is pushed into the casing 15. Then, the connecting pipe portion 60 is inserted from the outer end of the canister-side opening portion 31 from the tip portion 61 thereof, the connecting pipe portion 60 passes through the inside of the canister-side connecting pipe 30, and the tip portion 61 passes through the canister-side communicating portion. It is inserted from the opening 30a and projects into the gas-liquid separation chamber R of the casing 15.

Further, when the check valve 50 is pushed in until the wall portion 53a of the first case 53 forming the valve case 51 comes into contact with the tip of the canister-side connecting pipe 30 (that is, the peripheral portion of the canister-side opening 31), The base end side of the connecting pipe portion 60 enters the canister-side connecting pipe 30, the seal ring 80 is pressed against the inner circumference of the canister-side connecting pipe 30, and the connecting pipe portion 60 is press-fitted into the canister-side connecting pipe 30. .. At the same time, the neck portion 57a of the retaining portion 57 presses the engaging

portions

32c, 32c of the retaining bracket 32 from the inner side to push and expand the pair of holding

pieces

32b, 32b to bend and deform them. When the neck portion 57a goes in and passes through the engaging

portions

32c and 32c, the pair of holding

pieces

32b and 32b elastically return, the neck portion 57a engages with the engaging

portions

32c and 32c, and the holding plate portion 57b. Engage with the front side of the pair of holding

pieces

32b, 32b.

As a result, as shown in FIG. 5, the canister 60 is retained so that the connecting pipe portion 60 does not come off from the canister-side opening 31, and the check valve 50 is prevented from rotating with respect to the casing 15. The connecting pipe portion 60 can be directly connected to the side opening 31. The gap between the inner circumference of the canister-side connection pipe 30 and the outer circumference of the connection pipe portion 60 is hermetically sealed by the seal ring 80.

When the liquid fuel in the fuel tank 1 tilts or rocks due to tilting, sudden acceleration / deceleration, turning, etc. of the vehicle, a float valve (not shown) of the fuel cutoff device 2 normally opens the opening. Although it is blocked, the inflow to the canister 3 side is blocked, but before the float valve closes the opening, the liquid fuel is combined with the fuel vapor through the pipe 5a, and the tank side connection pipe 27 passes through the tank side. It may flow into the gas-liquid separation chamber R through the port 27a. At this time, the liquid fuel that has flowed into the gas-liquid separation chamber R collides with the inner circumference of the peripheral wall 23 of the casing main body 20 to separate the fuel vapor and the liquid fuel into gas and liquid, but they are not in time. Instead, liquid fuel may flow out to the canister side.

At this time, in the gas-liquid separation device 10, the check valve 50 is directly connected to the canister-side opening 31 of the casing 15 and constitutes a part of the passage 5 that allows the gas-liquid separation chamber R and the canister 3 to communicate with each other. Since the connecting pipe portion 60 for connecting the gas-liquid separation device 10 and the check valve 50 is unnecessary, the liquid fuel flowing into the gas-liquid separation chamber R is accumulated in the pipe. Can be prevented. Therefore, as described above, even if the liquid fuel that has flowed into the gas-liquid separation chamber R flows out to the check valve 50 side through the connection pipe portion 60, since the above-described piping does not exist in the first place, the liquid fuel is It can be easily returned to the gas-liquid separation chamber R.

Further, as shown in FIG. 10, when the vehicle is reversed, the liquid fuel accumulates in the gas-liquid separation chamber R due to the downward facing cap 40 and the peripheral wall 23 on the opening 25 side of the casing body 20. The liquid fuel may enter the check valve 50 through the opening of the tip of the connecting pipe portion 60. Also in this case, as described above, since there is no pipe connecting the gas-liquid separation device 10 and the check valve 50, it is possible to easily return the liquid fuel into the gas-liquid separation chamber R.

Further, in this embodiment, as shown in FIG. 5, the connecting pipe portion 60 is inserted into the canister-side opening 31 from the outside of the casing 15 and is connected to the base end side of the connecting pipe portion 60. A valve seat 64 is provided on which the valve element of the check valve 50 (here, the positive pressure valve 70 incorporated in the check valve 50) comes in and out. Therefore, as shown by the arrow in FIG. 5, even if the liquid fuel flows into the connecting pipe portion 60, the valve seat 64 provided on the proximal end side of the connecting pipe portion 60 and the valve body abutting the valve seat 64 cause Since the invasion into the check valve 50 is prevented, the liquid fuel can be easily returned to the gas-liquid separation chamber R.

Further, in this embodiment, as shown in FIG. 5, the tip portion 61 of the connecting pipe portion 60 inserted into the canister-side opening 31 projects into the gas-liquid separation chamber R. Therefore, even if the liquid fuel in the fuel tank 1 tilts or swings due to the tilting or turning of the vehicle and flows into the gas-liquid separation chamber R from the tank-side opening 28, the connecting pipe portion 60 of the connecting pipe portion 60 will be removed. The opening of the tip portion 61 can be made hard to be buried in the liquid fuel, and the inflow of the liquid fuel into the check valve 50 can be suppressed. Further, as described above, even if the liquid fuel in the fuel tank flows into the gas-liquid separation chamber R from the tank-side opening 28 due to the rocking of the fuel or the like, the liquid remains in the tip portion 61 of the connecting pipe portion 60. Since it is possible to easily collide the fuel and change the course of the fuel or disperse the fuel, the gas-liquid separation performance of the gas-liquid separation device 10 can be enhanced, and the liquid fuel flows into the check valve 50. Can be hardened.

Further, in this embodiment, as shown in FIG. 4 and FIG. 5, a ventilation portion 63 communicating with the inside of the connecting pipe portion 60 is formed on the outer peripheral upper surface side of the tip portion 61 of the connecting pipe portion 60. Therefore, for example, as shown in FIG. 9, even if the gas-liquid separation device 10 tilts due to the vehicle leaning or the like and the opening of the tip end portion 61 of the connecting pipe portion 60 is buried in the liquid fuel, the connecting pipe portion is It becomes easier to secure ventilation inside and outside 60, and it is possible to prevent liquid fuel from being sucked up into the connecting pipe portion 60 by the pressure inside the gas-liquid separation chamber R. That is, as shown by the arrow in FIG. 9, the pressure in the gas-liquid separation chamber R pushes the liquid surface of the liquid fuel via the ventilation portion 63, so that the suction of the liquid fuel into the connecting pipe portion 60 is suppressed. It

FIG. 11 shows another embodiment of the gas-liquid separator with a check valve according to the present invention. It should be noted that substantially the same parts as those in the above-described embodiment are designated by the same reference numerals and the description thereof will be omitted.

In a gas-liquid separator 10A with a check valve in this embodiment (hereinafter, also simply referred to as “gas-liquid separator 10A”), a check valve 50A has a different shape from that of the above embodiment. That is, as shown in FIG. 11, in the check valve 50A, the connecting pipe portion 60A of the first case 53 is formed shorter than the connecting pipe portion 60 of the above embodiment. More specifically, the connecting pipe portion 60A is inserted into the canister-side opening 31 from the outside of the casing 15, and the check is performed until the wall portion 53a of the first case 53 contacts the front-side peripheral edge of the canister-side opening 31. In the state in which the valve 50A is pushed in, the distal end portion 61 of the connecting pipe portion 60A in the extending direction does not project into the gas-liquid separation chamber R, but is located at a position retracted to the outside of the casing from the canister side communication port 30a. Is formed.

Also in this gas-liquid separator 10A, the check valve 50A is directly connected to the canister-side opening 31 of the casing 15 as in the gas-liquid separator 10 of the above-described embodiment, and the gas-liquid separation chamber R and the canister are connected. Since it has the connecting pipe portion 60A that constitutes a part of the passage 5 that communicates with the gas flow path 3, the pipe for connecting the gas-liquid separation device 10A and the check valve 50A is unnecessary, and the gas-liquid separation chamber R is provided in the pipe. It is possible to prevent the liquid fuel that has flowed into the inside from being accumulated, and to easily return the liquid fuel into the gas-liquid separation chamber R.

12 to 18 show still another embodiment of the gas-liquid separator with a check valve according to the present invention. It should be noted that substantially the same parts as those in the above-described embodiment are designated by the same reference numerals and the description thereof will be omitted.

In the gas-liquid separator 10B with a check valve (hereinafter, also simply referred to as "gas-liquid separator 10B") in this embodiment, the entire check valve 50B is housed and arranged in the gas-liquid separation chamber R in the casing 15A. Therefore, it is different from the gas-

liquid separators

10 and 10A of the above embodiment.

The casing 15B of this embodiment has a gas-liquid separation chamber R inside and a casing body having a check valve accommodation opening 25a (hereinafter, also simply referred to as "accommodation opening 25a") capable of accommodating the check valve 50B. 20B and a cap 40B attached to the accommodation opening 25a.

On the other hand, unlike the check valve 50 of the above-described embodiment, the check valve 50B of this embodiment is connected from the outer peripheral edge of the first ventilation port 53c of the wall portion 53a of the first case 53 as shown in FIG. The pipe portion 60 does not extend, but the annular protrusion 64a protrudes. Further, the connection pipe portion 65B extending from the outer peripheral edge of the second ventilation port 55c of the wall portion 55a of the second case 55 has a seal ring mounting groove 67 formed on the outer periphery on the tip portion 66 side, and has an annular seal. A ring 80 is attached.

Then, the connecting pipe portion 65B is inserted from the inside of the casing 15B into the canister-side opening portion 31 and press-fitted into the canister-side connecting pipe 30 via the seal ring 80, whereby the connecting pipe portion 65B is moved to the canister-side. It is adapted to be directly connected to the opening 31. That is, in this embodiment, the connection pipe portion 65B constitutes the "connection pipe portion which is directly connected to the canister-side opening and constitutes a part of the passage" in the present invention.

Further, as shown in FIGS. 12 and 18, the peripheral wall 53b of the first case 53, which constitutes the valve case 51 of the check valve 50B and has a substantially cylindrical shape that gradually expands in diameter, is provided on the valve seat 64 side. The most reduced diameter portion 53d located, the most enlarged diameter portion 53e located on the side of the second case 55, and the most enlarged diameter portion 53e arranged between them, and having a larger diameter than the reduced diameter portion 53d and an enlarged diameter portion. The intermediate portion 53f has a diameter smaller than that of 53e. The intermediate portion 53f is continuously provided in the axial direction from the tip of the reduced diameter portion 53d via the step portion 53g.

The check valve 50B can be housed in the gas-liquid separation chamber R of the casing body 20B through the housing opening 25a. In this embodiment, as shown in FIGS. 16A and 16B, the entire axial length L3 of the check valve 50B (from the tip of the annular protrusion 64a of the first case 53 to the connecting pipe of the second case 55). The length up to the tip of the portion 65B) is matched with the inner diameter D of the casing body 20B, and the check valve 50B can be accommodated in the casing body 20B through the accommodation opening 25a. Further, as shown by the chain double-dashed line in FIG. 16 (b), in the state where the check valve 50B is housed in the gas-liquid separation chamber R of the casing body 20B with its connecting pipe portion 65B facing the canister-side opening 31, The valve case 51 can be pushed in the direction in which the connecting pipe portion 65B is inserted into the canister-side opening 31. Since the valve case 51 can be pushed in the gas-liquid separation chamber R as described above, the valve case 51 can be moved in the gas-liquid separation chamber R.

A support wall for supporting the valve case 51 of the check valve 50B housed in the casing body 20B is provided from the inside of the bottom wall 21 of the casing body 20B located on the side opposite to the housing opening 25a. It is standing. As shown in FIG. 12 and FIG. 13, in this embodiment, on the inside of the bottom wall 21 (the side facing the gas-liquid separation chamber R) and on the extension line E along the opening direction of the tank-side opening 28. The first support wall 35 and the second support wall 37 are erected so as to be located at.

More specifically, the first supporting wall 35 faces the tank-side opening 28 in the circumferential direction of the peripheral wall 23 of the casing body 20B, and stands from a position slightly inner diameter side of the peripheral wall 23. The tank-side opening 28 has a plate-like shape with a predetermined width, which is arranged in a direction orthogonal to the extension line E (see FIG. 13A). Further, the width of the first support wall 35 is formed to be larger than the inner diameter of the tank side opening 28, so that the tank side opening 28 can be covered.

Further, an arcuate notch 36 for holding the outer periphery of the first case 53 forming the valve case 51 of the check valve 50B is formed at the tip end portion 35a of the first support wall 35 in the standing direction. There is. As shown in FIG. 17, the arcuate notch 36 is formed with a curvature that matches the reduced diameter portion 53d of the peripheral wall 53b of the first case 53 of the check valve 50B. In addition, the first support wall 35, as shown by the arrow B in FIG. 13B, when the gas-liquid separation chamber R is viewed from the axial direction of the canister-side opening 31 (more specifically, When the gas-liquid separation chamber R is viewed from the inner peripheral portion of the casing main body 20B on the side opposite to the canister-side opening 31 toward the axial direction of the canister-side opening 31), as shown in FIG. The center C1 of the arc K forming the circle 36 and the center C2 of the canister-side opening 31 are provided coaxially. Note that, as shown in FIG. 13B, when the first support wall 35 looks at the gas-liquid separation chamber R from the opening direction of the accommodation opening 25a (see the arrow Y in FIG. 13A), It can be said that the center C1 of the arc forming the notch 36 and the center C2 of the canister-side opening 31 are coaxial with each other. Further, the center C2 of the canister side opening 31 means the radial center of the canister side opening 31 (here, the center in the axial direction of the canister side connecting pipe 30).

On the other hand, as shown in FIG. 13B, the second support wall 37 is located between the tank-side opening 28 and the first support wall 35, and extends in the opening direction of the tank-side opening 28. It has a plate shape that extends along the extending line E and that is arranged so as to be orthogonal to the first support wall 35. As shown in FIG. 16A, a tip portion 37a of the second support wall 37 in the standing direction supports the expanded diameter portion 53e of the first case 53 of the check valve 50B.

Further, the heights of the first support wall 35 and the second support wall 37 (the standing lengths of the

walls

35, 37 from the inside of the bottom wall 21) are the same as those of the first support wall 35 and the second support wall 35. With the first case 53 supported by the support wall 37, as shown in FIG. 16A, the axis C3 of the check valve 50B and the center C2 of the canister-side opening 31 are aligned (coaxially). Is set).

Next, the cap 40B will be described. As shown in FIG. 15, the cap 40B of this embodiment is a gas-liquid separation device that prevents the connection pipe portion 65B inserted into the canister-side opening 31 from the inside of the casing and directly connected from coming out from the canister-side opening 31. A restricting portion that restricts the movement of the valve case 51 in the chamber R is provided. The regulation portion is composed of a first regulation portion 45 and a pair of

second regulation portions

47, 47 which are respectively provided so as to project from the back side of the cap 40B.

More specifically, on the back surface side of the base portion 41 of the cap 40B, at a substantially central position in the radial direction, a first restricting portion 45 extending with a predetermined width is provided so as to project. An arcuate notch 45a is formed at the tip of the first restricting portion 45 in the projecting direction so as to press and hold the outer periphery of the first case 53. The arcuate notch 45a is formed with a curvature adapted to the reduced diameter portion 53d of the peripheral wall 53b of the first case 53. Further, as shown in FIG. 18, the first restricting portion 45 has a valve case 51 accommodated in the gas-liquid separation chamber R, and the cap 40B is attached to the accommodation opening 25a of the casing body 20B. It is arranged so as to face the stepped portion 53g of the peripheral wall 53b of the first case 53 forming the case 51, and thereby restricts the movement of the valve case 51 in the gas-liquid separation chamber R.

Further, on the back surface side of the base portion 41 of the cap 40B, between the first regulation portion 45 and the annular projection 43, a pair of

second regulation portions

47, 47 having a substantially prismatic shape are provided. The spaces are projected in parallel with each other. The tip of each of the second restricting portions 47 in the protruding direction, the surface on the side of the first restricting portion 45 is inclined so as to be gradually thinned toward the tip of the protruding direction of the second restricting portion 47. A pressing surface 47a is formed so that the valve case 51 can be pressed in with the work of mounting the cap 40B in the housing opening 25a of the casing body 20B. Further, one side surface on the base side of each restricting portion 47 and in the same direction as the pushing surface 47a forms a restricting surface 47b for restricting the movement of the valve case 51.

In addition, the second restricting portion 47 projects longer than the first restricting portion 45, and when the cap 40B is attached to the housing opening 25a of the casing body 20B, the second restricting portion 47 comes out before the first restricting portion 45. The tip portion of the restriction portion 47 contacts the valve case 51. Further, in the pair of

second restriction parts

47, 47, the valve case 51 is housed in the gas-liquid separation chamber R, and the cap 40B is attached to the housing opening 25a of the casing body 20B (see FIG. 17). The valve case 51 is arranged on both sides of the annular protrusion 64a of the first case 53.

When the cap 40B is attached to the housing opening 25a of the casing body 20B, the pair of the second restricting

portions

47, 47 has the

pressing surfaces

47a, 47a which are By pressing the outer peripheral edge of the wall portion 53a of the first case 53 of the case 51, the connecting pipe portion 65B is pushed in the direction of being inserted into the canister-side opening portion 31 as shown by an arrow F2 in FIG. ing. That is, the pushing surface 47a serves to convert the pushing force of the cap 40B in the direction of the arrow F1 into the pushing force of the valve case 51 indicated by the arrow F2. Further, as shown in FIG. 17, in a state where the valve case 51 is housed in the gas-liquid separation chamber R and the cap 40B is attached to the housing opening 25a of the casing body 20B, the pair of second restricting

portions

47, 47. The restriction surfaces 47b, 47b are arranged to face the outside of the wall portion 53a of the first case 53 of the valve case 51, and the movement of the valve case 51 in the gas-liquid separation chamber R is prevented. regulate. That is, the second restricting portion 47 allows the valve case to be pushed in the direction in which the connecting pipe portion is inserted into the canister side opening portion when the cap is attached to the check valve accommodation opening portion in the present invention. It is a "regulatory department."

Next, the function and effect of the gas-liquid separator 10B having the above configuration will be described.

First, above the casing main body 20B, the connection pipe portion 65B of the check valve 50B is directed toward the canister-side connection pipe 30 side, and the first case 53 of the valve case 51 is cut into an arcuate cutout of the first support wall 35. The check valve 50B is housed in the gas-liquid separation chamber R from above the casing main body 20B through the housing opening 25a while being aligned so as to be substantially aligned with the casing 36. Then, as shown in FIG. 16, the reduced diameter portion 53d of the peripheral wall 53b of the first case 53 is placed and supported in the notch 36 of the first support wall 35, and the tip end portion of the second support wall 37 is formed. The enlarged diameter portion 53e of the peripheral wall 53b of the first case 53 is placed and supported on the 37a. As a result, as shown in FIG. 16A, the valve case 51 is provided in the gas-liquid separation chamber R so that the axis C3 of the check valve 50B and the center C2 of the canister-side opening 31 are coaxial. It is housed and arranged.

After that, move the valve case 51 and insert the connecting pipe portion 65B into the canister-side opening 31 for a while. That is, the valve case 51 is moved by a predetermined distance in the direction indicated by the arrow F2 in FIG. 16B, and as shown in FIG. 17, the tip end portion 66 of the connecting pipe portion 65B passes through the canister-side passage 30a. Then, the canister-side opening 31 is inserted by a predetermined length.

In the above state, as shown in FIG. 17, the notch 45a of the first restricting portion 45 of the cap 40B is directed toward the peripheral wall 53b side of the first case 53 of the valve case 51, and the pair of second restricting

portions

47, 47 is provided. So that the cap 40B is generally positioned above the casing body 20B so as to be located outside the wall portion 53a of the first case 53, and the cap 40B is pushed into the accommodation opening 25a of the casing body 20 to be mounted. I will do it. Then, the pushing

surfaces

47a, 47a of the pair of second restricting

portions

47, 47 press the outer peripheral edge portion of the wall portion 53a of the first case 53, and as shown by the arrow F2 in FIG. 17, the connecting pipe portion 65B. Is pushed in the direction further inserted into the back side of the canister-side opening 31, the connecting pipe portion 65B is press-fitted into the canister-side connecting pipe 30 via the seal ring 80, and as shown in FIG. It can be directly connected to the canister-side opening 31.

After that, the annular projection 43 of the cap 40B is fixed to the tapered surface 24a of the inner circumference of the expanded diameter portion 24 of the casing body 20B, so that the cap 40 is attached to the accommodation opening 25a of the casing body 20B. In this state, as shown in FIG. 18, the arcuate notch 45a of the first restricting portion 45 of the cap 40B abuts on the reduced diameter portion 53d of the peripheral wall 53b of the first case 53, so that the valve case 51. Is pressed from above, the distal end portion 45a of the first restricting portion 45 is arranged so as to face the step portion 53g of the peripheral wall 53b of the first case 53, and the restricting surfaces 47b of the pair of second restricting

portions

47, 47. , 47b are arranged opposite to the outside of the wall portion 53a of the first case 53, and the movement of the valve case 51 in the gas-liquid separation chamber R is restricted.

In this embodiment, as shown in FIG. 17, after the valve case 51 is supported by the

support walls

35 and 37, the connection pipe portion 65B is slightly inserted into the canister-side opening 31, and then the casing body 20B is closed. Although the cap 40B is attached to the accommodation opening 25a and the valve case 51 is pushed in through the second restricting portion 47, after the valve case 51 is supported by the

support walls

35 and 37, the connecting pipe portion 65B is inserted. The connection pipe portion 65B may be inserted into the canister-side opening portion 31 only by the pushing force of the valve case 51 by the second restricting portion 47 when the cap 40B is attached, without being inserted into the canister-side opening portion 31.

In the gas-liquid separation device 10B having the above-described configuration, the valve case 51 of the check valve 50B is arranged in the gas-liquid separation chamber R as shown in FIG. Even if the liquid fuel in the tank flows into the gas-liquid separation chamber from the tank-side opening 28, the liquid fuel can collide with the valve case 51 and change its course or be dispersed. It is possible to improve the gas-liquid separation performance by 10B to make it difficult for the liquid fuel to flow into the check valve 50B, and to suppress the noise when the positive pressure valve 70 and the negative pressure valve 75 housed in the valve case 51 are activated. can do.

Further, in this embodiment, the casing main body 20B has an accommodation opening 25a capable of accommodating the check valve 50B. Therefore, before mounting the cap 40B, the check valve 50B can be easily housed in the gas-liquid separation chamber R through the housing opening 25a. Further, in the cap 40B, a restriction part (here, the first restriction part 45 and the first restriction part 45 and the restriction part 45 in this example) that restricts the movement of the valve case 51 in the gas-liquid separation chamber R so that the connection pipe part 65B does not come off from the canister-side opening 31. The 2nd control part 47) is provided. Therefore, with the cap 40B attached to the housing opening 25a, the movement of the valve case 51 is restricted by the restriction part, and the connection pipe part 65B is securely retained and held so as not to come off from the canister side opening 31. be able to.

Further, in this embodiment, a support wall (here, the first support wall 35 and the second support wall 37) is erected from the bottom wall 21 of the casing body 20B, and the valve case 51 is provided by the tip of the support wall. Is supposed to support. Therefore, the valve case 51 arranged in the gas-liquid separation chamber R can be firmly supported, and the liquid fuel in the fuel tank can flow from the tank-side opening 28 to the gas-liquid separation chamber R due to the rocking of the fuel or the like. When the liquid fuel flows into the inside of the check valve 50B, the liquid fuel collides with the support wall and can change its course or be dispersed, so that the liquid fuel can be made difficult to flow into the check valve 50B.

Further, in this embodiment, the outer circumference of the valve case 51 is circular (here, the peripheral wall 53b of the first case 53 constituting the valve case 51 is circular), and the support wall (here In the front end portion 35a of the first support wall 35), an arcuate notch 36 for holding the outer periphery of the valve case is formed. As shown in FIG. 14, the gas-liquid separation chamber R is opened on the canister side. When viewed from the axial direction of the portion 31, the center C1 of the arc forming the notch 36 and the center C2 of the canister-side opening 31 are provided so as to be coaxial. Therefore, by mounting the valve case 51 in the notch 36 of the tip end portion 35a of the first support wall 35 through the accommodation opening portion 25a of the casing main body 20B and supporting the valve case 51, the connecting pipe portion 65B is positioned in the canister side opening portion 31. In the aligned state, the check valve 50B can be housed in the gas-liquid separation chamber R, and the subsequent insertion work of the connecting pipe portion 65B into the canister-side opening 31 can be facilitated so that the canister-side opening It is possible to improve workability of connecting the connection pipe portion 65B to the connection pipe 31.

Further, in this embodiment, the restricting portion (here, the second restricting portion 47) of the cap 40B is configured such that the connecting pipe portion 65B is inserted into the canister-side opening 31 when the cap 40B is attached to the accommodation opening 25a. The valve case 51 can be pushed in the direction of the arrow. That is, the valve case 51 is pushed by the second restricting portion 47 and the connecting pipe portion 65B is inserted into the canister-side opening portion 31 as the cap 40B is attached to the housing opening portion 25a of the casing body 20B. Before mounting the cap 40B, it is possible to reduce the need to insert the connection pipe portion 65B into the canister-side opening portion 31, or to eliminate the need to insert the connection pipe portion 65B into the canister-side opening portion 31. The connection workability of 65B can be further improved.

The present invention is not limited to the above-described embodiment, and various modified embodiments are possible within the scope of the gist of the present invention, and such an embodiment is also included in the scope of the present invention. ..

1 Fuel Tank 2 Fuel Cutoff Device 3 Canister 5

Passage

10, 10A, 10B Gas-

Liquid Separation Device

15, 15A,

15B Casing

20, 20B Casing Body 25 Opening 25a Check Valve Housing Opening 28 Tank Side Opening 31 Canister Side Opening 35 1st support wall 37

2nd support wall

40,40B cap 45 1st control part 47

2nd control part

50,50A, 50B check valve 51 valve case 53 1st case 55

2nd case

60,60A connection pipe part 63

ventilation Portion

65, 65B Connection pipe portion 70 Positive pressure valve 75 Negative pressure valve 80 Seal ring R Gas-liquid separation chamber

Claims

A liquid shutoff device that prevents the fuel from flowing out of the fuel tank and a canister that is disposed outside the fuel tank are placed in a passage that communicates with each other, and liquid fuel that flows together with the fuel vapor flows to the canister side. A gas-liquid separation device with a check valve for preventing
It has a casing in which a gas-liquid separation chamber is formed, and a check valve for adjusting the pressure in the fuel tank,
The casing has a tank-side opening that connects the fuel cutoff device and the gas-liquid separation chamber, and a canister-side opening that connects the canister and the gas-liquid separation chamber,
The gas-liquid separation device with a check valve, wherein the check valve has a connecting pipe portion that is directly connected to the canister-side opening and forms a part of the passage.
The check valve is connected by inserting the connecting pipe portion into the canister-side opening from the outside of the casing, and a valve seat communicating with the inside of the check valve is provided on the base end side of the connecting pipe portion. The gas-liquid separator with a check valve according to claim 1, wherein the valve body of the check valve is configured to come into contact with and separate from the valve seat.
The gas-liquid separation device with a check valve according to claim 2, wherein a tip end portion of the connection pipe part inserted into the canister-side opening projects into the gas-liquid separation chamber.
The gas-liquid separator with a check valve according to claim 3, wherein a ventilation part communicating with the inside of the connection pipe is formed on the outer peripheral upper surface side of the tip end of the connection pipe.
The check valve has a valve case accommodating the valve body and the connection pipe portion provided in the valve case, and the valve case is arranged in the gas-liquid separation chamber to perform the connection. The gas-liquid separator with a check valve according to claim 1, wherein the pipe portion is inserted into the canister-side opening from the inside of the casing.
The casing has the gas-liquid separation chamber inside, a casing main body having a check valve accommodation opening capable of accommodating the check valve, and a cap attached to the check valve accommodation opening. Cage,
6. The check according to claim 5, wherein the cap is provided with a restriction portion that restricts movement of the valve case in the gas-liquid separation chamber so that the connection pipe portion does not come out of the canister-side opening. Gas-liquid separator with valve.
The casing main body has a bottom wall located on the side opposite to the check valve accommodation opening, and a support wall is erected from the bottom wall, and a tip portion in the erection direction of the support wall. The gas-liquid separation device with a check valve according to claim 6, wherein the valve case is supported by.
The outer periphery of the valve case has a circular shape, and an arcuate notch for holding the outer periphery of the valve case is formed at the tip of the support wall.
When the gas-liquid separation chamber is viewed from the axial direction of the canister-side opening, the center of the arc forming the notch and the center of the canister-side opening are coaxial with each other. The gas-liquid separation device with a check valve according to claim 7, further comprising:
The restriction portion of the cap is configured to be able to push the valve case in a direction in which the connection pipe portion is inserted into the canister-side opening when the cap is attached to the check valve accommodation opening. The gas-liquid separator with a check valve according to any one of claims 6 to 8.