JP2001003818A - Gas-liquid separating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a liquid phase fuel from invading to a canister by connecting an inlet pipe to a lower end part of a gas-liquid separating chamber, opening an outlet pipe to the inside of the gas-liquid separating chamber, and arranging foaming eliminating means for bursting air bubbles generated at an opening part of the inlet pipe before it reaches an opening part of the outlet pipe. SOLUTION: When gasoline steam flows from an opening part 6 into a bubble passage 14 through an inlet pipe 5 by positive pressure in a fuel tank, bubbles are generated at the opening part 6 at the time of flow-in, and air bubbles are generated. When the air bubbles grow, its liquid film is burst by foam eliminating member 18 such as continuous air bubble urethane. As a result, it is obstructed by a partition wall 10 that liquid phase fuel forming a liquid film is invaded from a gas communicating passage 13 into a liquid reservoir chamber 15, it drops downward the bubble passage 14, and flows to a liquid phase part of the liquid reservoir chamber 15 bypassing liquid communicating passages 16, 17 formed on both side of the bubble passage 14. On the other hand, air phase fuel is raised in the bubble passage 14, and is entered into the gas-liquid separating chamber 3 to lead to a canister bypassing the outlet pipe 7 and the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-liquid separation device, and more particularly, to an evaporative fuel treatment device for collecting evaporative fuel evaporated from a fuel tank in an internal combustion engine and discharging the same to an intake system. And a device for separating gasoline vapor sucked into the canister into gaseous fuel and liquid fuel.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5, a gas phase portion of a fuel tank 101 mounted on a vehicle and an adsorbent 10 such as activated carbon are used.
A gas-liquid separation device 105 is provided in a communication passage 104 with the canister 103 containing the gas tank 2, and gasoline vapor generated in a gas phase portion of the fuel tank 101 is passed through the communication passage 104 to the gas-liquid separation device 1.
05 into the gas-liquid separation chamber 106
6, the gaseous fuel and the liquid phase fuel are separated, only the gaseous fuel is introduced into the canister 103, and the high boiling point of the liquid phase fuel adheres to the adsorbent 102 in the canister 103 and the adsorbent 102
There is known an evaporative fuel processing apparatus for preventing deterioration of the fuel.

[0003] As the gas-liquid separation device 105,
As shown in FIG. 5, an opening 108 of an inlet pipe (tank port) 107 communicating with the communication passage 104 is opened above the gas-liquid separation chamber 106, and an outlet pipe 109 communicating with the canister 103 is connected to the gas-liquid separation chamber. The one which is set up at the center of 106 and whose upper end is opened into the gas-liquid separation chamber 106 is
For example, it is disclosed in JP-A-8-158958.

However, in the case where the opening 108 of the inlet pipe 107 is opened at the upper part of the gas-liquid separation chamber 106 as described above, the gas-liquid pressure is reduced by the negative pressure in the fuel tank 101 when the fuel tank 101 is cooled. The liquid fuel stored in the separation chamber 106 is supplied to the fuel tank 10 through the inlet pipe 107.
The effect of backflow to the liquid 1 is small, and the liquid-phase fuel is
There is a problem that it stays in 06.

In order to solve this problem, the present applicant has previously set up an outlet pipe 203 similar to the above at the center of a gas-liquid separation chamber 202 in a gas-liquid separation device 201 as shown in FIG. And an opening 204 at the upper end thereof.
Is opened in the gas-liquid separation chamber 202, and an opening 206 of the inlet pipe 205 is opened at the lower end of the gas-liquid separation chamber.
Japanese Patent Application No. Hei 10-119837 proposes that the liquid fuel stored in the fuel tank 02 is easily returned to the fuel tank through the inlet pipe 205.

[0006]

However, when the opening 206 of the inlet pipe 205 is opened at the lower end of the gas-liquid separation chamber 202 as shown in FIG. When the air-mixed fuel introduced into the pipe 205 flows into the gas-liquid separation chamber 202 from the opening 206 of the inlet pipe 205, the fuel bubbles as shown in FIG. 7, and the bubbles grow as shown in FIG. In the meantime, the liquid film 300 forming the bubble is formed in the opening 204 of the outlet pipe 203.
Gasoline vapor reaches the outlet pipe 20
When the liquid film 300 is sucked from the opening 204 into the canister by the flow, the liquid film 300 is sucked from the outlet pipe 203 into the canister, and there is a problem that the adsorbent 102 in the canister is deteriorated.

Therefore, the present invention solves the problem caused by the above-mentioned bubbles generated by bubbling of fuel being ruptured before reaching the outlet pipe, and the liquid film being sucked from the outlet pipe as described above. The purpose is to do so.

[0008]

According to a first aspect of the present invention, an opening for an inlet pipe is provided at a lower end of a gas-liquid separation chamber. An outlet pipe is opened in the separation chamber, and defoaming means is provided in the gas-liquid separation chamber to burst a liquid film of bubbles generated at the opening of the inlet pipe before reaching the opening of the outlet pipe. It is assumed that.

When an opening of the inlet pipe is provided at the lower end of the gas-liquid separation chamber, gas bubbles are generated from the opening when gasoline vapor flows into the gas-liquid separation chamber from the opening. Since the present invention is provided with defoaming means for rupture of the liquid film of the bubbles before reaching the opening of the outlet pipe, the liquid film forming the bubbles is sucked from the opening of the outlet pipe provided in the gas-liquid separation chamber. Is prevented, and the liquid fuel is prevented from being sucked into the canister.

According to a second aspect of the present invention, an inlet pipe is opened at a lower portion of the gas-liquid separation chamber, and an outlet pipe is provided upright at a substantially central portion of the gas-liquid separation chamber. An upper end is opened to the gas-liquid separation chamber, and a partition wall is provided between the opening of the inlet pipe and the outlet pipe. The partition wall forms a bubble passage on the opening side of the inlet pipe and a liquid reservoir on the outlet pipe side. A chamber is provided, and a bubble breaker is installed in the bubble passage;
A gas communication path is provided at an upper portion of the partition wall for communicating the bubble passage with the liquid reservoir, and a bottom of the bubble passage and a bottom of the liquid reservoir are partially communicated with each other by a liquid communication passage. Things.

In the present invention, gas bubbles generated when gasoline vapor flows into the gas-liquid separation chamber from the opening of the inlet pipe opened at the lower end of the gas-liquid separation chamber flows into the liquid storage chamber by the partition wall. Ascends the bubble path without. At the time of this rising, the liquid film of the bubbles is ruptured and defoamed by the defoaming member which is the defoaming means. This rupture separates the gaseous fuel and the liquid-phase fuel, the gaseous fuel rises and flows from the gas communication passage formed at the upper part of the partition wall to the opening of the outlet pipe, and the liquid-phase fuel falls and falls into the bubble passage. The liquid flows out of the liquid communication passage formed at the bottom into the liquid storage chamber. Therefore, the liquid film forming bubbles is prevented from reaching the outlet pipe, and the liquid fuel is prevented from being sucked into the canister.

According to a third aspect of the present invention, an inlet pipe is opened at a lower portion of the gas-liquid separation chamber, and an outlet pipe is provided upright at a substantially central portion of the gas-liquid separation chamber. An upper end is opened to the gas-liquid separation chamber, a partition wall is provided around the outlet pipe, and an annular bubble passage is formed by the partition wall and a peripheral wall constituting the gas-liquid separation chamber, and a liquid is formed inside the partition wall. A reservoir is formed, an upper portion of the bubble passage communicates with the reservoir in a direction opposite to an opening of the inlet pipe, and a lower end of at least a part of the bubble passage communicates with the reservoir. It is assumed that.

In the present invention, gas bubbles generated when gasoline vapor flows into the gas-liquid separation chamber from the opening of the inlet pipe opened at the lower end of the gas-liquid separation chamber flows into the liquid storage chamber by the partition wall. Without passing through the annular bubble passage to the side opposite to the opening of the inlet pipe. When the air bubbles pass through the long annular air bubble passage, the air bubbles come into contact with a wide wall surface forming the air bubble passage, and the wall surface serves as a defoaming means, and the liquid film of gas-liquid is ruptured. This rupture separates the fuel into gaseous fuel and liquid fuel.The gaseous fuel flows from the side opposite to the opening of the inlet pipe to the opening of the outlet pipe. Spills to bottom of chamber. Therefore, the liquid film forming the bubbles is prevented from being sucked into the outlet pipe.

Moreover, in the second aspect of the present invention, since the bubble cutting member easily holds the liquid phase fuel, the held liquid phase fuel is pushed out to the liquid storage chamber by the pressure of the gasoline vapor flowing in next. Although there is a possibility, in the third aspect of the present invention, there is no such a possibility because the bubble removing member is not provided and the defoaming action is performed on a wide wall surface. Therefore, the liquid film is further suppressed from being sucked into the outlet pipe.

According to a fourth aspect of the present invention, in the third aspect of the present invention, an opening to the liquid reservoir is provided between the opening to the liquid reservoir above the bubble passage and the outlet pipe. A turning plate is provided to prevent the gaseous fuel flowing out of the outlet from directly hitting the outlet pipe.

In the present invention, the gaseous fuel flowing out of the bubble passage hits the deflection plate and is prevented from flowing directly into the opening of the outlet pipe. Moreover, the defoaming is also performed by the deflection plate. Therefore, the liquid film forming the bubbles is further suppressed from being sucked into the outlet pipe.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described based on an embodiment shown in FIGS. 1 and 2
1 shows a first embodiment, FIG. 1 shows a gas-liquid separation device, and FIG. 2 shows a state of generation of bubbles in the device of FIG.

In FIG. 1, a gas-liquid separation chamber 3 is formed in a case 2 constituting the gas-liquid separation device 1A. An inlet pipe 5 is provided on the peripheral wall 4 of the case 2 with its opening 6 located at the lower end of the peripheral wall 4, that is, at the lower end of the gas-liquid separation chamber 3. The inlet pipe 5 communicates with the gas phase of the fuel tank 101 as shown in FIG.

An outlet pipe 7 is provided upright at the center of the gas-liquid separation chamber 3, and an opening 8 on the inlet side of the outlet pipe 7 is located above the gas-liquid separation chamber 3 and opens. The outlet side is connected to a communication pipe 9. The communication pipe 9 is communicated with the canister 103 as shown in FIG.

In the gas-liquid separation chamber 3, the partition wall 1 is located between the opening 6 of the inlet pipe 5 and the outlet pipe 7.
0 is provided. The partition wall 10 is erected in close contact with the bottom wall 11 of the gas-liquid separation chamber 3, and has a height H ₁ between the upper end face 10 a and the upper wall 12 of the gas-liquid separation chamber 3. The passage 13 is set to be formed. Also,
The height H ₁ of the partition wall 10 and the height H of the outlet pipe 7
Relationship and _2, is set to H _1> H _2. Further, the partition wall 10 is arranged inwardly from the inner peripheral surface of the peripheral wall 4 of the case 2 by a predetermined distance D ₁ and is arranged in a semicircular shape along the peripheral wall 4, and a half circle is formed between the partition wall 10 and the peripheral wall 4. A circular bubble passage 14 is formed, and a liquid reservoir 15 is formed between the partition wall 10 and the outlet pipe 7. The partition walls 10 are evenly arranged on both sides with the opening 6 of the inlet pipe 5 as a center. Furthermore, both end portions 10b, 10c of the partition wall 10
Are separated from the peripheral wall 4, and liquid communication passages 16, 17 for communicating the bubble passage 14 and the liquid storage chamber 15 at least at the bottom thereof are provided between the side ends 10 b, 10 c and the peripheral wall 4. It is formed in such a manner.

In the bubble passage 14, a bubble removing member 18 as a defoaming means for bursting a liquid film of bubbles is accommodated. As the bubble removing member 18, for example, a sponge or urethane (honeycomb open cell urethane) having continuous cells in the body is used. The bubble removing member 18 has an outer peripheral surface in close contact with the peripheral wall 4, an inner peripheral surface in close contact with the partition wall 10, and a lower end surface in close contact with the bottom wall 11.
It is arranged to fill the whole. Thereby, the bubble removing member 18 is in close contact with the opening 6 of the inlet pipe 5. Further, the bubble-cutting member 18 is provided on the upper end face 10 of the partition wall 10.
a, and the upper end of the bubble removing member 18 is located above the upper end surface of the opening 8 of the outlet pipe 7.

In the above structure, when gasoline vapor flows into the bubble passage 14 from the opening 6 through the inlet pipe 5 due to the positive pressure in the fuel tank, the gas flows through the opening 6 as shown in FIG. The liquid film 19 is generated by the bubbles and the bubbles. However, when the bubble grows, the liquid film 19 is ruptured by the bubble breaker 18. The liquid fuel having formed the liquid film 19 due to the rupture is prevented from entering the liquid storage chamber 15 from the gas communication passage 13 by the partition wall 10 and falls below the bubble passage 14. The liquid flows into the liquid phase portion of the liquid storage chamber 15 through the liquid communication passages 16 and 17 formed on both sides.

Further, due to the rupture of the liquid film 19, the gaseous fuel rises in the bubble passage 14 and flows into the upper part of the liquid reservoir 15 through the gas communication passage 13 formed in the upper part of the partition wall 10.

Since the bubbling mainly occurs near the entrance of the opening 6 of the inlet pipe 5, the area of D _{2 in} the bubble passage 14 becomes a gas phase as shown in FIG.
The range of ₃ is the liquid phase. Although foaming ranges D ₁ of the bubble passageway 14 shown in FIG. 2 (a), the foaming partition wall 1
0 is not transmitted to the liquid reservoir chamber 15 by the liquid phase fuel in the liquid reservoir chamber 15 indicated by a range of D ₄ is stabilized.

As described above, almost only the gaseous phase fuel is sucked from the opening 8 of the outlet pipe 7, and the liquid film of bubbles, ie, the liquid phase Can be prevented from deteriorating the adsorbent of the canister by being sucked.

Next, a second embodiment shown in FIGS. 3 and 4 will be described. FIG. 3 shows a gas-liquid separation device, and FIG. 4 shows a state of generation of bubbles in the device of FIG. A gas-liquid separation chamber 3 is formed in a case 2 constituting the gas-liquid separation device 1B. An inlet pipe 5 similar to that of the first embodiment is provided on the peripheral wall 4 of the case 2 with the opening 6 located at the lower end of the peripheral wall 4 of the case 2, that is, at the lower end of the gas-liquid separation chamber 3. ing.

An outlet pipe 7 is provided upright at the center of the gas-liquid separation chamber 3, and an opening 8 on the inlet side of the outlet pipe 7 is located above the gas-liquid separation chamber 3 and opens. The outlet side is connected to a communication pipe 9 similar to the first embodiment.

A partition wall 20 is arranged in the gas-liquid separation chamber 3 so as to surround the outer peripheral portion of the outlet pipe 7. Further, the partition wall 20 is formed in a cylindrical shape concentric with the outlet pipe 7 between the peripheral wall 4 and the outlet pipe 7, and an annular space having a predetermined width D ₅ is formed between the partition wall 20 and the peripheral wall 4. A liquid reservoir chamber 15 having a diameter of D ₆ is formed between the partition wall 20 and the outlet pipe 7.

A gas communication passage 22 is formed above the partition wall 20 in a direction opposite to the opening 6 of the inlet pipe 5 with the outlet pipe 7 interposed therebetween. Further, the upper end of the partition wall 20 excluding the gas communication passage 22 is in close contact with the inner surface of the upper wall 12 of the case 2. The height H ₃ from the inner surface of the bottom wall 11 to the bottom surface of the gas communication passage 22 is equal to the height of the bottom wall 1.
Height H ₂ from the inner surface 1 to the upper end surface of the outlet pipe 7
Is set at a higher position.

[0030] In the case where the gas communicating passage 22 is located diametrically opposite the opening 6, the height H ₃ is the height H ₂ and equal to or may be less. Further, a lower end of the partition wall 20 is provided with a horizontal pipe portion 9a from the outlet pipe 7 to the communication pipe 9.
Except for the bubble passage 21 and the liquid storage chamber 15 between the bottom end of the partition wall 20 and the bottom wall 11.
And a liquid communication passage 23 is formed. Also,
Height H ₄ from the inner surface of the bottom wall 11 to the lower end surface of the partition wall 20
It is set lower than the height H ₅ from the inner surface to the top edge 6a of the opening 6 of the inlet pipe 5 of the bottom wall 11.

In the liquid storage chamber 15, a deflecting plate 24 is provided between the gas communication passage 22 and the outlet pipe 7 as shown in FIG.
As shown in (b), the gaseous fuel flowing from the gas communication passage 22 into the liquid storage chamber 15 is disposed at an angle with respect to the outflow direction from the gas communication passage 22 when viewed in plan. It does not directly enter the opening 8 of the pipe 7. Then, the gaseous phase fuel hitting the deflecting plate 24 is transferred to an exit passage 25 formed by a gap between the deflecting plate 24 and the partition wall 20.
From the outlet pipe 7 side.

In the structure shown in FIG. 3, when the gasoline vapor flows into the bubble passage 21 from the opening 6 through the inlet pipe 5 due to the positive pressure in the fuel tank, the gas flows into the opening as shown in FIG. The liquid film 26 is generated by the bubbles at 6. When the bubble is generated, the upper end 6 a of the opening 6 is formed by the partition wall 2 forming the liquid communication passage 23.
Since the bubble is set at a position higher than the lower end of 0, the air bubble hits the partition wall 20 and does not enter the liquid storage chamber 15 from the liquid communication path 23. Therefore, the liquid phase fuel is stabilized without the liquid in the liquid storage chamber 15 foaming.

The air bubbles generated in the opening 6 hit the outer peripheral surface 20a of the partition wall 20 and grow while expanding on both sides and upward in the air bubble passage 21. At this time, the liquid film 26 of the bubbles comes into contact (collides) with the outer peripheral surface 20a of the partition wall 20 and the inner peripheral surface 4a of the peripheral wall 4, which bursts as defoaming means. Due to this rupture, the liquid fuel drops to the bottom of the bubble passage 21.

As shown in FIG. 4 (a), the air bubbles which have grown greatly due to the repetition of the above-mentioned rupture are formed in the gas communication passage 2 as shown in FIG.
When the pressure reaches 2, the gas flows into the liquid storage chamber 15 from the gas communication passage 22. The number of bubbles flowing in is smaller than the number of bubbles reaching the outlet pipe 203 in FIG. 7, and the size of the bubbles is considerably large, so that the amount of liquid due to the liquid film is small.

Further, as described above, the liquid film of the bubbles flowing from the gas communication passage 22 is prevented from flowing directly into the opening 8 of the outlet pipe 7 by the deflection plate 24 and hits the deflection plate 24. To burst. Then, the defoamed gaseous fuel flows from the outlet passage 25 to the opening 8 of the outlet pipe 7 as shown by the arrow Y.
And is sucked into the outlet pipe 7.

Therefore, almost gas-phase fuel is sucked from the outlet pipe 7 into the canister. Next, FIG. 6 and FIG.
The measurement results of the inflow amount of the liquid-phase fuel into the canister by the gas-liquid separation device shown in FIG. 1 and the inflow amount of the liquid-phase fuel into the canister by the gas-liquid separation devices of the first and second embodiments of the present invention will be described. .

At the time of measurement, first, as shown in FIG.
The inlet pipe 205 of the gas-liquid separator 201 shown in FIGS. 6 and 7 is connected to the air supply device 400 through the communication passage 104, and the communication passage 104 is provided with a syringe 401, and the outlet pipe 203 is connected to the measuring cylinder 402. . Then, a predetermined amount of air was supplied from the air supply device 400 at a positive pressure, and 30 ml of liquid fuel was injected by the syringe 401. As a result, 3 ml of liquid fuel 403 was accumulated in the measuring cylinder 402.

Next, the above-described bubble separation device 201 was replaced with the gas-liquid separation device 1A of the first embodiment shown in FIGS. 1 and 2 of the present invention, and the measurement was performed in the same manner as above. Has accumulated 0.8 ml of liquid fuel.

Further, as a result of performing measurement in the same manner as above by replacing the gas-liquid separator 1B of the second embodiment shown in FIGS. 3 and 4 of the present invention, 0.4 ml of liquid fuel is stored in the measuring cylinder 402. Was.

From the above measurement results, it was found that according to the embodiment of the present invention, it is possible to reduce the amount of liquid-phase fuel flowing into the canister as compared with the embodiment shown in FIGS.
In the first embodiment shown in FIGS. 1 and 2, the liquid-phase fuel in the bubble removing member 18 does not easily flow into the liquid storage chamber 15 and is easily retained in the bubble removing member 18. Therefore, when the next high-pressure gasoline vapor flows in from the opening 6, there is a possibility that the liquid-phase fuel held in the bubble breaker 18 is pushed upward and is sucked into the outlet pipe 7.

On the other hand, in the second embodiment shown in FIGS.
According to the embodiment, there is no liquid fuel in the bubble passage 21 as described above, and the bubbles are in large contact with the inner peripheral surface 4a of the peripheral wall 4 and the outer peripheral surface 20a of the partition wall 20 (FIG. Defoamed in the (collision) area.

Therefore, according to the second embodiment shown in FIGS. 3 and 4, the problem of the first embodiment shown in FIGS. 1 and 2 is solved, and as shown in the measurement result, the liquid-phase fuel is introduced into the canister. The amount can be the lowest of the three.

The peripheral wall 4 in each of the above embodiments may have a square planar shape.

[0044]

As described above, according to the first aspect of the present invention, by providing the defoaming means, the amount of the liquid-phase fuel flowing into the canister from the outlet pipe provided in the gas-liquid separation chamber is provided. And the deterioration of the adsorbent in the canister can be prevented.

According to the second aspect of the present invention, the bubble removing member serves as a defoaming means, and can exert the same effect as described above. According to the third aspect of the invention, the amount of the liquid-phase fuel flowing into the canister is further reduced as compared with the second aspect of the invention,
The deterioration of the adsorbent can be further prevented.

According to the fourth aspect of the present invention, the provision of the deflection plate can further reduce the amount of liquid-phase fuel flowing into the canister, and can further prevent the deterioration of the adsorbent.

[Brief description of the drawings]

FIGS. 1A and 1B show a first embodiment of the present invention, in which FIG. 1A is a longitudinal sectional view, and FIG. 1B is a sectional view taken along line AA in FIG.

FIGS. 2A and 2B show a foaming state in the embodiment shown in FIG. 1, wherein FIG. 2A is a longitudinal sectional view, and FIG.
FIG.

3A and 3B show a second embodiment of the present invention, in which FIG. 3A is a longitudinal sectional view, and FIG. 3B is a sectional view taken along line BB in FIG. 3A.

4A and 4B show a bubbling state in the embodiment shown in FIG. 3, wherein FIG. 4A is a longitudinal sectional view, and FIG.
B sectional drawing.

FIG. 5 is a diagram showing an evaporated fuel processing apparatus to which the gas-liquid separation device of the present invention is applied.

FIGS. 6A and 6B show a gas-liquid separation device previously proposed by the present applicant, wherein FIG. 6A is a longitudinal sectional view, and FIG.
C line sectional drawing.

FIGS. 7A and 7B show a bubbling state of the gas-liquid separator of FIG. 6, wherein FIG. 7A is a longitudinal sectional view, and FIG.
Line sectional view.

FIG. 8 is a schematic diagram showing an apparatus for measuring gas-liquid separation.

[Explanation of symbols]

 1A, 1B Gas-liquid separator 2 Case 3 Gas-liquid separation chamber 4 Peripheral wall 5 Inlet pipe 6 Opening 7 Outlet pipe 8 Opening 10 Partition wall 13 Gas communication path 14, 21 Bubble path 15 Liquid storage chamber 16, 17 Liquid communication path 18 Defoaming member as defoaming means 19, 26 Liquid film 20 Partition wall as defoaming means 22 Gas communication passage 23 Liquid communication passage 24 Deflection plate

Claims (4)

[Claims] An opening of an inlet pipe is provided at a lower end of a gas-liquid separation chamber, an outlet pipe is opened in the gas-liquid separation chamber, and a liquid of bubbles generated at the opening of the inlet pipe is provided in the gas-liquid separation chamber. A gas-liquid separation device, further comprising defoaming means for bursting the membrane before reaching the opening of the outlet pipe. 2. An inlet pipe is opened at a lower part of the gas-liquid separation chamber, and an outlet pipe is erected at a substantially central part of the gas-liquid separation chamber, and an upper end thereof is opened at the gas-liquid separation chamber. Providing a partition wall between the opening of the inlet pipe and the outlet pipe,
This partition wall forms a bubble passage on the opening side of the inlet pipe,
A liquid storage chamber is defined on the outlet pipe side, a bubble cut-off member is installed in the bubble passage, and a gas communication passage communicating the bubble passage and the liquid storage chamber is provided at an upper portion of the partition wall, A gas-liquid separator characterized in that the bottom of the bubble passage and the bottom of the liquid storage chamber are partially connected by a liquid communication passage. 3. An inlet pipe is opened at a lower part of the gas-liquid separation chamber, and an outlet pipe is erected at a substantially central part of the gas-liquid separation chamber, and an upper end thereof is opened at the gas-liquid separation chamber. Providing a partition wall around the outlet pipe, forming an annular bubble passage with the partition wall and a peripheral wall constituting a gas-liquid separation chamber, and forming a liquid reservoir inside the partition wall; Wherein the upper part of the air bubble communicates with the reservoir in a direction opposite to the opening of the inlet pipe, and at least a lower end of at least a part of the bubble passage communicates with the reservoir. 4. A diversion between the opening to the reservoir at the upper part of the bubble passage and the outlet pipe so that the gas-phase fuel flowing out from the opening to the reservoir does not directly hit the outlet pipe. The gas-liquid separation device according to claim 3, further comprising a plate.