JP2009117174A - Gas-liquid separator for fuel cell, and moving vehicle equipped with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve efficiency of gas-liquid separation with respect to a gas-liquid separator for a fuel cell and a moving vehicle equipped with the same. <P>SOLUTION: This is a gas-liquid separator for the fuel cell 10 to separate moisture in the off-gas exhausted from the fuel cell, and is provided with a cylindrical body 20, an entrance part 22 of the off-gas installed in the body 20, an exit part 24 of the off-gas installed in the body 20, and an exhaust water port 26 of moisture installed in the main body 20. The body 20 is provided with windmills 41-44 to turn impellers by the flow of the off-gas. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a gas / liquid separation device for a fuel cell that separates moisture in off-gas discharged from the fuel cell, and a moving body including the fuel cell gas / liquid separation device.

  In general, off-gas discharged from a fuel cell that generates electricity by reacting oxygen and hydrogen contains a large amount of mist-like water and water generated by a chemical reaction to promote the reaction. A large amount of water may cause various problems. For example, in a vehicle equipped with a fuel cell, it causes a problem of water splashing on the following vehicle.

  For this reason, conventionally, as shown in Patent Documents 1 to 3, various devices for separating moisture in the offgas discharged from the fuel cell have been proposed. These produced a spiral flow in the conduit, and the water was separated by the centrifugal force generated by the spiral flow.

JP 2005-160187 A JP 2002-35895 A JP 2002-143617 A

  However, the conventional gas-liquid separator for a fuel cell has a problem that a sufficient centrifugal force cannot be obtained and the efficiency of gas-liquid separation is low.

  The present invention has been made to solve the above-described conventional problems, and an object thereof is to increase the efficiency of gas-liquid separation.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

[Application Example 1]
A gas-liquid separation device for a fuel cell that separates moisture in off-gas discharged from the fuel cell,
A tubular body,
The off-gas inlet provided in the main body;
The off-gas outlet provided in the main body;
The water outlet provided in the main body, and
The main body is
A gas-liquid separator for a fuel cell, comprising an impeller that is provided in the middle of the flow of the off gas from the inlet portion to the outlet portion and emits the off gas by rotating.

  According to the fuel cell gas-liquid separator described in Application Example 1, off-gas is diffused by the rotation of the impeller and sent to the inner wall of the main body. As a result, moisture in the off-gas adheres to the inner wall as droplets. Further, the off gas hits the blades of the impeller, and the droplets adhere to the blades, and the attached droplets are scattered far away by the centrifugal force generated by the rotation of the impeller. This action also causes droplets to adhere to the inner wall of the main body. As a result, the efficiency of gas-liquid separation can be increased.

[Application Example 2]
The fuel-liquid gas-liquid separator according to Application Example 1, wherein the impeller is a windmill that is rotated by the off-gas flow. According to this configuration, power for rotating the impeller is not required, and the energy efficiency is excellent.

[Application Example 3]
In the gas-liquid separation device for a fuel cell according to Application Example 2, the inlet portion and the outlet portion are provided on one side and the other side on the central axis of the main body portion, and the windmill is connected to the windmill. A gas-liquid separation device for a fuel cell, which is arranged so that a rotation axis coincides with a central axis of the main body. According to this configuration, the wind turbine can efficiently receive the off-gas introduced from the inlet portion, and moreover, can efficiently blow moisture toward the inner peripheral wall surface of the main body portion. Therefore, the efficiency of gas-liquid separation can be further increased.

[Application Example 4]
The gas-liquid separation device for a fuel cell according to Application Example 3, wherein the fuel cell gas-liquid separation device extends linearly on the central axis of the main body portion, and is exposed from the outlet portion and bent at the exposed portion, so that the outer wall surface of the main body portion A fuel cell gas-liquid separator, wherein the wind turbine is disposed on the linear portion of the shaft rod. According to this configuration, since it is not necessary to provide a means for fixing the shaft rod in the main body in the main body, the discharge of liquid droplets is not hindered by that means.

[Application Example 5]
5. The fuel cell gas-liquid separator according to any one of Application Examples 2 to 4, wherein a first windmill as the windmill is disposed near the entrance. According to this configuration, since the off-gas entering from the inlet can be immediately gas-liquid separated, the overall gas-liquid separation efficiency can be further improved.

[Application Example 6]
The fuel-liquid gas-liquid separator according to Application Example 5, wherein a second windmill as the windmill is disposed in the vicinity of the outlet portion. According to this configuration, since gas-liquid separation can be achieved in two stages near the entrance and exit, the efficiency of gas-liquid separation can be further increased. In particular, since a part of the liquid droplets attached to the inner wall by the windmill provided near the inlet portion can be scattered from the outlet portion toward the inner wall again by the windmill provided near the outlet portion, The efficiency of gas-liquid separation can be further increased.

[Application Example 7]
6. The fuel cell gas-liquid separator according to Application Example 5, wherein the outlet portion is configured by an opening formed in a wall surface of the main body, and projects from the opening toward the inside of the main body. A gas-liquid separator for a fuel cell, further comprising: According to this configuration, even when a droplet attached to the inner wall of the main body due to the action of the windmill receives the off-gas flow and moves to the outlet side through the inner wall, the double structure of the main body and the inner cylinder The droplet can be caught once at the part. For this reason, it is possible to prevent droplets from entering the inner cylinder and being discharged from the outlet portion. Therefore, the efficiency of gas-liquid separation can be further increased.

[Application Example 8]
8. The fuel cell gas-liquid separation device according to Application Example 7, wherein the inner cylinder includes a bottom surface that closes an opening end in the inlet portion direction, and an opening provided on a peripheral wall. Separation device. According to this configuration, the off gas sent from the direction of the inlet portion advances straight and is prevented from entering the inner cylinder as it is. Thereby, it is possible to prevent the droplets from being discharged straight from the outlet portion on the off gas.

[Application Example 9]
The gas-liquid separator for a fuel cell according to any one of Application Examples 2 to 8, wherein the windmill includes two windmills, and the two windmills are viewed from the direction of the central axis. The fuel cell gas-liquid separator is arranged so as to be displaced from each other when the two blades are rotated so that both blades rotate integrally. According to this configuration, when viewed from the direction of the central axis, the blades of the second wind turbine are always located between the blades of the first wind turbine. For this reason, it is possible to prevent the off-gas that has passed between the blades of the first windmill without hitting the blades and not passing through the blades of the second windmill. Therefore, since the off gas can be reliably scattered, the efficiency of gas-liquid separation can be further enhanced.

[Application Example 10]
A fuel cell;
A moving body comprising: an exhaust system that discharges off-gas discharged from the fuel cell to the atmosphere;
A moving body comprising the fuel cell gas-liquid separator according to any one of Application Examples 1 to 9 provided on the most downstream side of the exhaust system.

  According to the moving body described in the application example 10, the moisture in the off-gas discharged from the fuel cell can be reliably separated by the fuel cell gas-liquid separator. For this reason, by collecting or appropriately treating the separated water, it is possible to prevent water from moving on the moving body following the moving body.

[Application Example 11]
It is a moving body of application example 10, Comprising: The impeller with which the said gas-liquid separation apparatus for fuel cells is equipped with the structure rotated by the flow of the atmosphere which generate | occur | produces by the driving | running | working of the said moving body. According to this configuration, power for rotating the impeller is not required, and the energy efficiency is excellent.

  The present invention can be realized in various forms other than those described above. For example, the present invention can be realized in the form of a fuel cell system including the gas-liquid separation device for a fuel cell of the present invention, the form in which the moving body of the present invention is a vehicle, or the like. It is possible.

  Hereinafter, embodiments of the present invention will be described based on examples.

1. First embodiment:
A. Overall car configuration:
FIG. 1 is a schematic configuration diagram of an automobile 1 equipped with a gas-liquid separator for a fuel cell as a first embodiment of the present invention. The automobile 1 includes a fuel cell 3 disposed in an engine room in the front part of the vehicle and an exhaust system 5 of the fuel cell 3. The exhaust system 5 includes a diluter 7, a muffler 8, a fuel cell gas-liquid separator 10 and the like.

  The fuel cell 3 is supplied with a hydrogen gas containing hydrogen and an oxidant gas containing oxygen (for example, air), and causes an electrochemical reaction at the hydrogen electrode and the oxygen electrode to generate electric power. Used hydrogen off-gas and oxidant off-gas are discharged from the exhaust system 5 to the outside of the vehicle.

  The diluter 7 is for treating residual hydrogen in the hydrogen off gas, and is provided near the center of the vehicle. A muffler 8 is provided on the downstream side of the diluter 7 of the exhaust system 5, and a fuel cell gas-liquid separator 10 is provided on the tail end which is the most downstream side.

B. Configuration of gas-liquid separator for fuel cell:
FIG. 2 is a cross-sectional view showing the inside of the fuel cell gas-liquid separator 10. The fuel cell gas-liquid separator 10 includes a cylindrical main body 20. The main body portion 20 is provided with an inlet portion 22 for introducing off gas. The inlet portion 22 is configured by opening the main body portion 20, and the diameter of the opening is smaller than the diameter of the cylindrical main body portion 20. The inlet portion 22 is connected to an oxidant offgas passage 5a through which the oxidant offgas discharged from the fuel cell 3 flows.

  On the opposite side of the main body portion 20 from the inlet portion 22, an outlet portion 24 for discharging off-gas into the atmosphere is provided. The outlet portion 24 is configured by an opening formed in the wall surface of the main body portion 20. A cylindrical inner cylinder 26 is connected to the opening. The inner cylinder 26 has a structure protruding from the opening of the main body portion 20 toward the inner side of the main body portion, that is, a structure folded from the wall surface of the main body portion 20. The inlet portion 22 and the outlet portion are provided on one side and the other side on the central axis of the cylindrical main body portion 20.

  A drain port 28 for discharging moisture is provided near the lowest point of the peripheral wall on the side close to the outlet 24 in the main body 20. A water distribution pipe 30 is connected to the drain port 28.

  A shaft bar 32 is provided on the central axis of the cylindrical main body 20. The shaft 32 is exposed from the outlet portion 24 and bent into a U shape, and is fixed to the outer wall surface of the main body portion 20. In this embodiment, it is fixed by brazing with a brazing material 34. The range of the shaft bar 32 located inside the main body 20 has a linear shape that matches the central axis.

  First to fourth windmills 41, 42, 43, 44 are disposed in the linearly extending range of the shaft rod 32. The first to fourth windmills 41, 42, 43, 44 are provided in this order in the direction from the inlet portion 22 toward the outlet portion 24, and the first windmill 41 and the second windmill 42 are paired with each other. The third windmill 43 and the fourth windmill 44 are paired and provided in the vicinity of the outlet section 24, that is, in the vicinity of the inner cylinder 26. The “second windmill” referred to here is different from the “second windmill” referred to in the claims. The “first windmill” referred to in the claims refers to a windmill provided near the entrance, and corresponds to the first windmill 41 and the second windmill 42. The “second windmill” referred to in the claims refers to a windmill provided in the vicinity of the exit, and corresponds to the third windmill 43 and the fourth windmill 44.

  Each windmill 41, 42, 43, 44 is an impeller that rotates with the flow of gas from the inlet portion 22 to the outlet portion 24 in the main body portion 20. Each of the wind turbines 41 to 44 includes a rotation support portion RT that is rotatably provided on the shaft rod 32 by a bearing, and four blades (blades) BD that are fixed to the rotation support portion RT. The blade BD provided in the second windmill 42 is the largest of the four windmills 41 to 44, and the blade BD provided in the first windmill 41 is a medium-sized one. The size is suitable for being arranged in a range from the inlet portion 22 to the portion having a large diameter. The blade BD provided in each of the third windmill 43 and the fourth windmill 44 is the same size and is the smallest of the four windmills 41 to 44, and covers the open end of the inner cylinder 26. The size is appropriate. In this embodiment, the shape of the blade BD of each windmill 41 to 44 is a propeller type.

  The rotation support portion RT of the first windmill 41 and the rotation support portion RT of the second windmill 42 are connected to each other and are common. Thereby, the 1st windmill 41 and the 2nd windmill 42 rotate integrally. On the other hand, the rotation support portion RT of the third windmill 43 and the rotation support portion RT of the fourth windmill 44 are connected to each other and are common. Thereby, the 3rd windmill 43 and the 4th windmill 44 rotate integrally.

  FIG. 3 is an explanatory diagram showing the positional relationship between the blades BD of the first windmill 41 and the second windmill 42. This figure is a view seen from the direction of the central axis of the main body 20. Each windmill 41, 42 includes four blades BD (1) and BD (2) arranged at 90 ° intervals. The blade BD (1) that is not hatched in the drawing is that of the first windmill 41, and the blade BD (2) that is hatched is that of the second windmill 42. The blade blade BD (2) of the second windmill 42 is arranged so as to be shifted (offset) by 45 ° with reference to the position of the blade BD (1) of the first windmill 41. That is, when the first and second windmills 41 and 42 are viewed from the direction of the central axis of the main body portion 20, the second windmill 41, between the blade BD (1) and the blade BD (1) of the first windmill 41, Each blade BD (2) of the wind turbine 42 is located.

  The positional relationship between the blades of the third windmill 43 and the blades of the fourth windmill 42 is also the position of the blade BD (1) of the first windmill 41 and the blade BD (2) of the second windmill 42. Similar to the relationship, they are offset from each other by 45 °.

C. Off-gas flow:
Next, the flow of the oxidant off-gas in the fuel cell gas-liquid separator 10 configured as described above will be described. As shown in FIG. 2, the oxidant off-gas (hereinafter simply referred to as “off-gas”) introduced from the inlet 22 extends into the main body 20 and is discharged from the outlet 24 into the atmosphere through the inner cylinder 26. Is done. The wind turbines 41 to 44 rotate in the flow from the off-gas inlet 22 to the outlet 24. The off-gas is diffused due to the rotation, and travels toward the inner wall of the main body 20. Further, the off gas hits the blades BD of the first and second windmills 41 and 42, and the droplets M adhere to the blades BD, and the adhered droplets M are scattered far away by the centrifugal force generated by the rotation of the windmills 41 and 42. It will be. The scattered droplets M adhere to the inner wall of the main body 20.

  As a result, the droplet M ′ adhering to the inner wall of the main body 20 receives the off-gas flow and travels along the wall surface toward the outlet 24. The droplet M ′ transmitted through the wall surface is discharged from the drain outlet 28 to the water distribution pipe 30. The water distribution pipe 30 is connected to a water recovery device (not shown), and the discharged water is recovered. Alternatively, the water distribution pipe 30 may be configured to be exposed from the bottom surface of the automobile 1 and may be configured to discharge moisture to the outside of the vehicle.

  The off-gas flowing in the main body portion 20 passes through the inner cylinder 26 to the outlet portion 24, but immediately before reaching the inner cylinder 26, the off-gas is diffused by the rotation of the third and fourth windmills 43 and 44. Sent to the inner wall. Also in the third and fourth windmills 43 and 44, the droplet M adheres to the blade BD, and the adhered droplet M is scattered far away by the centrifugal force generated by the rotation of the windmills 43 and 44.

  Even when the droplet M ′ adhering to the inner wall of the main body portion 20 receives the off-gas flow and moves to the outlet portion 24 side through the wall surface, a double structure of the main body portion 20 and the inner cylinder 26 is obtained. The droplet M ″ can be caught once in the portion. The droplet M ″ travels along the peripheral surface of the inner cylinder 26 and finally reaches the drain port 28.

D. effect:
According to the fuel cell gas-liquid separator 10 configured as described above, the oxidant off-gas is diffused by the rotation of the first to fourth windmills 41 to 44 as described above, and Head to the inner wall. Further, as described above, the droplets ejected from the blade BD by the centrifugal force of the wind turbines 41 to 44 adhere to the inner wall of the main body 20. As a result, there is an effect that the efficiency of gas-liquid separation can be increased. Furthermore, in the present embodiment, the efficiency of gas-liquid separation is further enhanced by the following actions (i) to (xi).

(I) Since the shaft rod 32 is provided on the central axis of the main body 20 and the first to fourth windmills 41, 42, 43, 44 are arranged on the shaft rod 32, The impellers of the wind turbines 41 to 44 can efficiently blow moisture toward the inner peripheral wall surface of the main body 20. Since the moisture that has arrived at the wall surface adheres to the wall surface and becomes droplets, the droplet travels along the wall surface and facilitates the discharge of moisture from the drain port.

(Ii) Further, since the shaft bar 32 is exposed from the outlet portion 24 and is bent in a U shape and fixed to the outer wall surface of the main body portion 20, means for fixing the shaft rod 32 is provided. Since it is not necessary to provide in the main-body part 20, discharge | emission of a droplet is not inhibited by the means.

(Iii) Since the first and second wind turbines 41 and 42 are provided in the vicinity of the inlet portion 22 of the main body portion 20, off-gas entering from the inlet portion 22 can be immediately gas-liquid separated. For this reason, the efficiency of gas-liquid separation as a whole can be further increased.

(Ix) Since the third and fourth wind turbines 43 and 44 are further provided in the vicinity of the outlet portion 24 of the main body portion 20, gas-liquid separation is achieved in two stages, near the inlet portion and near the outlet portion. Can do. In particular, the third and fourth windmills 43 and 44 show that part of the liquid droplets attached to the wall surface by the first and second windmills 41 and 42 provided in the vicinity of the inlet portion 22 is sucked out from the inner cylinder 26. Therefore, the efficiency of gas-liquid separation can be further enhanced.

(X) The droplet M ″ that has moved to the outlet portion 24 side is once captured by the portion having the double structure of the main body portion 20 and the inner cylinder 26 as described above. For this reason, it is possible to prevent droplets from entering the inner cylinder 26 and being discharged from the outlet portion 24.

(Xi) The first and second wind turbines 41 and 42 are paired, and the blades BD are offset from each other by 45 °, so that the space between the blade BD and the blade BD of the first wind turbine 41 is It is possible to prevent the off-gas that has passed through without hitting the blade BD from passing through the second windmill 42 without hitting the blade BD. Therefore, since the off gas can be reliably scattered, the efficiency of gas-liquid separation can be further enhanced. In the third and fourth wind turbines 43 and 44, off-gas can be reliably scattered by the same configuration.

2. Second embodiment:
FIG. 4 is a cross-sectional view showing the inside of a fuel cell gas-liquid separator 110 as a second embodiment of the present invention. The fuel cell gas-liquid separator 110 of the second embodiment is different from the fuel cell gas-liquid separator 10 (FIG. 2) of the first embodiment described above in that the inner cylinder 26 is not provided. Accordingly, the third and fourth wind turbines 43 and 44 are arranged on the downstream side as compared with the above embodiment. Except for these configurations, the second embodiment is the same as the first embodiment, and the same parts are denoted by the same reference numerals in the drawings. The second embodiment having such a configuration also has an effect that the efficiency of gas-liquid separation can be increased as in the first embodiment.

3. Third embodiment:
FIG. 5 is a sectional view showing the inside of a fuel cell gas-liquid separator 210 as a third embodiment of the present invention. Compared with the fuel cell gas-liquid separator 10 (FIG. 2) of the first embodiment described above, the fuel cell gas-liquid separator 210 of the second embodiment includes third and fourth wind turbines 43 and 44, respectively. There is no difference in that the entire length of the inner cylinder 226 is longer than that of the first embodiment (the configuration other than the entire length is the same as that of the inner cylinder 26 of the first embodiment). Other configurations are the same as those of the first embodiment, and the same parts are denoted by the same reference numerals in the drawings.

  According to the second embodiment having the above-described configuration, the efficiency of gas-liquid separation can be increased by the action of the first and second windmills 41 and 42, as in the first embodiment. Further, in the present embodiment, even when the droplets attached to the inner wall of the main body 20 due to the action of the first and second windmills 41 and 42 receive the flow of off-gas and move to the outlet 224 side through the inner wall. Since the wall surface is folded by the inner cylinder 226, the droplet can be temporarily captured by the folded portion. For this reason, it is possible to prevent droplets from entering the inner cylinder 226 and being discharged from the outlet portion 224. Therefore, the efficiency of gas-liquid separation can be further increased. In the present embodiment, the total length of the inner cylinder 226 is longer than that of the first embodiment, but it is not necessarily required to be longer, and may be the same length as the first embodiment or a shorter length.

4). Fourth embodiment:
FIG. 6 is a sectional view showing the inside of a fuel cell gas-liquid separator 310 as a fourth embodiment of the present invention. The fuel cell gas-liquid separator 310 of the fourth embodiment differs from the fuel cell gas-liquid separator 310 (FIG. 5) of the third embodiment described above in that the configuration of the inner cylinder 326 is different. The configuration is the same. The same parts are denoted by the same reference numerals in the figure.

  The inner cylinder 326 in this embodiment has a configuration in which the opening end in the direction of the inlet portion 22 is closed by the bottom surface 326a. The opening 326 b is provided on the peripheral wall of the inner cylinder 326. According to this configuration, the bottom surface 326a can prevent the off-gas sent from the direction of the inlet portion 22 from proceeding straight and entering the inner cylinder 326 as it is. Off-gas enters through the opening 326 b and is discharged from the outlet 324. Therefore, according to the present embodiment, it is possible to prevent droplets from being discharged straight from the outlet portion 324 on the off gas. As a result, the efficiency of gas-liquid separation can be further increased.

5). Example 5:
FIG. 7 is a sectional view showing the inside of a fuel cell gas-liquid separator 410 as a fifth embodiment of the present invention. Compared with the fuel cell gas-liquid separator 10 (FIG. 2) of the first embodiment described above, the fuel cell gas-liquid separator 410 of the fifth embodiment includes the third and fourth wind turbines 43 and 44. The difference is that a windbreak wall 450 is provided at the position of the third and fourth windmills 43 and 44. Other configurations are the same as those of the first embodiment, and the same parts are denoted by the same reference numerals in the drawings.

  The windbreak wall 450 has a cylindrical shape and is fixed to the shaft 32 so as to cover the inner cylinder 26 with a gap. A surface 450 a on the inlet portion 22 side of the windbreak wall 450 has a hemispherical shape, and allows the off gas to flow smoothly toward the wall surface direction of the main body portion 20. Even with such a configuration, it is possible to prevent the off-gas sent from the direction of the inlet portion 22 from proceeding straight and entering the inner cylinder 26 as it is by the windbreak wall 450. As a result, as in the fourth embodiment, it is possible to prevent the droplets from being discharged straight from the outlet portion 24 on the off gas. Therefore, the efficiency of gas-liquid separation can be further increased.

6). Other embodiments:
The present invention is not limited to the first to fifth examples and embodiments described above, and can be implemented in various modes without departing from the scope of the invention.

(1) Modification 1:
In the third to fifth embodiments (FIGS. 5 to 7) described above, the first and second windmills 41 and 42 are provided in the main body 20, and another characteristic configuration is provided in the main body 20. It is a thing. Another characteristic configuration mentioned here is an inner cylinder 226 in the third embodiment, an inner cylinder 326 having a bottom surface 326a and an opening 326b in the fourth embodiment, and in the fifth embodiment. These are the inner cylinder 26 and the windbreak wall 450. By adding this other characteristic configuration, as described above, the droplets adhering to the inner wall of the main body portion 20 are discharged from the outlet portion by the action of the first and second windmills 41 and 42. Can be prevented.

  In turn, when considering a configuration in which the first and second wind turbines 41 and 42 are not provided in the main body 20, the off-gas introduced from the input unit 41 spreads in the main body 20 even in this configuration, and the off-gas The water inside adheres to the inner wall of the main body 20 as a droplet. For this purpose, the gas-liquid separation device for a fuel cell provided with the other characteristic configuration described above alone, that is, the fuel provided with the other characteristic configuration without including the first and second windmills 41 and 42. A gas-liquid separator for a battery may be another aspect of the present invention.

That is, the first aspect as another aspect is:
A gas-liquid separation device for a fuel cell that separates moisture in off-gas discharged from the fuel cell,
A tubular body,
The off-gas inlet provided in the main body;
The off-gas outlet provided in the main body;
The water outlet provided in the main body, and
The inlet part and the outlet part are provided on one side and the other side on the central axis of the main body part,
The outlet part is constituted by an opening formed in the wall surface of the main body part,
A gas-liquid separator for a fuel cell, further comprising an inner cylinder protruding from the opening toward the inside of the main body.

The second aspect is
A gas-liquid separator for a fuel cell according to the first aspect,
The inner cylinder is
A bottom surface that closes the open end in the direction of the inlet,
A gas-liquid separator for a fuel cell, comprising: an opening provided on a peripheral wall.

The third aspect is
A gas-liquid separator for a fuel cell according to the first aspect,
A gas-liquid separator for a fuel cell, comprising a windproof wall that is cylindrical and covers the inner cylinder with a gap.

(2) Modification 2:
In the first and second embodiments, two pairs of wind turbines 41, 42, 43, 44 are provided, but instead of this, only one pair of wind turbines 41, 42 provided near the entrance is used. Also good. Or it is good also as a structure only of a pair of windmills 43 and 44 provided in the exit part vicinity. Furthermore, it is good also as a structure which provides 3 or more pairs of windmills. In addition, the wind turbine does not necessarily have to have a configuration in which two wind turbines are provided as a pair, and only one wind turbine may be provided, or a plurality of wind turbines may be provided individually without forming a pair. Further, in the third to fourth embodiments, the number of wind turbines may be two pairs.

(3) Modification 3:
In the first to fifth embodiments, the wind turbine has a configuration including four blades. However, instead of this, the wind turbine may include other numbers of blades such as 1, 2, 3, 5, 6,. Good. The windmill can be of various types such as a sail wing type. In short, the wind turbine can have any configuration as long as it can emit off-gas from the inlet to the outlet in the main body.

(4) Modification 4:
In the first to fifth embodiments, the shaft rod 32 on which the wind turbines 41 to 44 are arranged is fixed to the outer wall surface of the main body 20. Instead of this, a means for fixing the shaft rod is used as the main body. It is good also as a structure provided in a part. Moreover, it is not necessary to provide two pairs of wind turbines 41 to 44 on one shaft rod, and a configuration may be adopted in which a shaft rod is provided for every two wind turbines that make a pair. Furthermore, in the said 1st thru | or 5th Example, although the windmills 41-44 were arrange | positioned so that the rotating shaft of an impeller might correspond with the central axis of the main-body part 20, it replaces with this and does not correspond with a central axis. It is good also as a structure arrange | positioned in a position. In short, the windmill is provided in the middle of the flow of offgas from the inlet to the outlet in the main body, and can be arranged at any position as long as it can dissipate offgas by rotating. You may install by such means.

(5) Modification 5:
In the first to fifth embodiments, the main body 20 is cylindrical. However, instead of this, a polygonal cylinder such as a triangular cylinder, a square cylinder, a pentagonal cylinder, or a hexagonal cylinder may be used.

(6) Modification 6:
In the first to fifth embodiments, the fuel cell gas-liquid separator introduces the oxidant off-gas as the off-gas, but instead of this, a hydrogen off-gas may be introduced.

(7) Modification 7:
In the first to fifth embodiments, the impeller is a windmill rotating with an off-gas flow. However, it is not always necessary to rotate with an off-gas flow, and the impeller may be rotated with other power. . For example, a configuration in which a windmill rotating with an air flow generated by traveling of an automobile is provided outside the gas-liquid separator for a fuel cell, and the rotational force of the windmill is transmitted to an impeller included in the gas-liquid separator for a fuel cell. It is good. Alternatively, the impeller may be rotated by a power engine such as a motor.

(8) Modification 8:
In the first to fifth embodiments, the moving body including the fuel cell gas-liquid separator is an automobile. However, instead of this, a vehicle other than an automobile such as a train may be used. Moreover, it is not necessary to restrict to a vehicle, It is good also as other moving bodies, such as a ship and an airplane.

1 is a schematic configuration diagram of an automobile 1 equipped with a fuel cell gas-liquid separator 10 as a first embodiment of the present invention. 1 is a cross-sectional view showing the inside of a fuel cell gas-liquid separator 10. It is explanatory drawing which shows the positional relationship of the blade BD of the 1st windmill 41 and the 2nd windmill. It is sectional drawing which shows the inside of the gas-liquid separator 110 for fuel cells as 2nd Example of this invention. It is sectional drawing which shows the inside of the gas-liquid separation apparatus 210 for fuel cells as 3rd Example of this invention. It is sectional drawing which shows the inside of the gas-liquid separation apparatus 310 for fuel cells as 4th Example of this invention. It is sectional drawing which shows the inside of the gas-liquid separation apparatus 410 for fuel cells as 5th Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Automobile 3 ... Fuel cell 5 ... Exhaust system 5a ... Oxidant off-gas flow path 7 ... Diluter 8 ... Muffler 10 ... Gas-liquid separator for fuel cells 20 ... Main-body part 22 ... Inlet part 24 ... Outlet part 26 ... Inner cylinder DESCRIPTION OF SYMBOLS 28 ... Drain port 30 ... Distribution pipe 32 ... Shaft rod 34 ... Brazing material 41 ... 1st windmill 42 ... 2nd windmill 43 ... 3rd windmill 44 ... 4th windmill RT ... Rotation support part BD ... Blade M ... Droplet 110 ... Gas-liquid separator for fuel cell 124 ... Outlet portion 210 ... Gas-liquid separator for fuel cell 224 ... Outlet portion 226 ... Inner tube 310 ... Gas-liquid separator for fuel cell 324 ... Outlet portion 326 ... Inner tube 326a ... bottom surface 326b ... opening 410 ... gas-liquid separator for fuel cell 450 ... wind barrier

Claims (11)

A gas-liquid separation device for a fuel cell that separates moisture in off-gas discharged from the fuel cell,
A tubular body,
The off-gas inlet provided in the main body;
The off-gas outlet provided in the main body;
The water outlet provided in the main body, and
The main body is
A gas-liquid separator for a fuel cell, comprising an impeller that is provided in the middle of the flow of the off gas from the inlet portion to the outlet portion and emits the off gas by rotating. A gas-liquid separator for a fuel cell according to claim 1,
The impeller is
A gas-liquid separator for a fuel cell, which is a windmill rotating with the flow of the off-gas. It is a gas-liquid separator for fuel cells according to claim 2,
The inlet and outlet are
Provided on one side and the other side on the central axis of the main body,
The windmill is
A gas-liquid separation device for a fuel cell, which is disposed so that a rotation axis of the windmill coincides with a central axis of the main body. It is a gas-liquid separator for fuel cells according to claim 3,
A shaft bar that extends linearly on the central axis of the main body portion, is exposed from the outlet portion, is bent at the exposed portion, and is fixed to the outer wall surface of the main body portion,
The windmill is
A gas-liquid separator for a fuel cell, which is disposed in the linear portion of the shaft rod. A gas-liquid separator for a fuel cell according to any one of claims 2 to 4,
A gas-liquid separation device for a fuel cell, wherein a first windmill as the windmill is disposed in the vicinity of the entrance. The gas-liquid separator for a fuel cell according to claim 5,
A gas-liquid separation device for a fuel cell, wherein a second windmill as the windmill is disposed in the vicinity of the outlet. The gas-liquid separator for a fuel cell according to claim 5,
The outlet part is constituted by an opening formed in the wall surface of the main body part,
A gas-liquid separator for a fuel cell, further comprising an inner cylinder protruding from the opening toward the inside of the main body. The fuel-liquid gas-liquid separator according to claim 7,
The inner cylinder is
A bottom surface that closes the open end in the direction of the inlet,
A gas-liquid separator for a fuel cell, comprising: an opening provided on a peripheral wall. A gas-liquid separator for a fuel cell according to any one of claims 2 to 8,
The windmill includes two windmills,
The two windmills are
A gas-liquid separator for a fuel cell, wherein the blades are arranged so as to be displaced from each other when viewed from the direction of the central axis, and are configured such that both blades rotate integrally. A fuel cell;
A moving body comprising: an exhaust system that discharges off-gas discharged from the fuel cell to the atmosphere;
10. A moving body comprising the fuel cell gas-liquid separator according to claim 1 provided on the most downstream side of the exhaust system. The moving body according to claim 10,
The impeller included in the fuel cell gas-liquid separator is,
A moving body configured to rotate by a flow of air generated by traveling of the moving body.

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