JP2008204942A - Fuel cell system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel cell system capable of quickly restarting. <P>SOLUTION: A negative pressure operating section 24 generating negative pressure when a fuel cell stops driving has a high pressure-resistant rubber hose 30 among pipings connected with a fuel cell. A collar 32 as a rigid cylindrical member is arranged in the inside of the rubber hose in order to prevent a blockage of the rubber hose. The collar 32 is made of a rigid material, and is short enough in comparison with the rubber hose. A displaced position of the collar 32 is determined on the basis of deformation characteristics of the rubber hose 30 and a magnitude of generated negative pressure. Namely, the collar 32 is arranged at a position in which an interval D of the rigid cylindrical members is in a distance where the rubber hose 30 is not blocked up. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fuel cell system that generates electric power by bringing gas, that is, fuel gas (hydrogen gas), oxidant gas (air), and the like into and out of the fuel cell via one or more pipes.

  In recent years, a fuel cell system is often used as a drive source for a passenger car or the like. The fuel cell system is a system that generates electric power by carrying various gases into and out of a fuel cell (FC stack) in which a large number of cells are stacked through one or more pipes. Here, the gas supplied to the fuel cell or the gas recovered from the fuel cell is usually compressed and often has a high pressure. Therefore, piping for carrying in and out these gases is required to have sufficient resistance against high pressure. Therefore, conventionally, a high pressure rubber hose has been used as piping of the fuel cell system (for example, Patent Document 1). In other words, conventionally, it can be said that measures for high pressure have been sufficient for piping used in fuel cell systems.

JP 2002-373687 A JP 2004-6166 A JP 2005-267910 A

  By the way, in some fuel cell systems, an open / close valve is provided on a pipe for carrying gas in and out, and when the fuel cell is stopped, the open / close valve is closed to seal the fuel cell (for example, the above-mentioned patent document). 2, 3 etc.). In such a fuel cell system, after sealing, the gas remaining in the piping located closer to the fuel cell than the opening / closing valve is consumed for the reaction with the catalyst provided in the fuel cell, and the internal pressure of the piping is reduced. The negative pressure was lower than the atmospheric pressure, and the blockage occurred. When the fuel cell system is left in a cold environment for a long time in this closed state, the pipe may freeze while being closed. In this case, there is a problem that even if an attempt is made to restart the fuel cell, gas cannot be carried in and out, and the fuel cell cannot be started until freezing is eliminated. In other words, the conventional fuel cell system may not be able to restart quickly in a cold environment.

  Therefore, an object of the present invention is to provide a fuel cell system that can be quickly restarted even in a cold environment.

  The fuel cell system of the present invention is a fuel cell system that generates electric power by carrying gas into and out of the fuel cell via one or more pipes, and the pipe has a negative internal pressure when the fuel cell is stopped. A negative pressure acting portion and a negative pressure non-acting portion in which the internal pressure does not become negative even when the fuel cell is stopped. It is characterized by having an obstruction-inhibiting structure that obstructs obstruction caused by the negative pressure that accompanies it.

  In a preferred aspect, the negative pressure acting portion is a portion that is sealed in a state of communicating with the electrode of the fuel cell in the pipe when the fuel cell is stopped.

  In another preferred aspect, when the negative pressure acting portion includes a flexible tube made of a flexible material, the blocking prevention structure is made of a rigid material inside the flexible tube. In addition, one or more rigid cylindrical members shorter than the flexible tubular body are arranged. In this case, the length of the portion of the flexible tube where the rigid cylindrical member is not disposed is determined based on the deformation characteristics of the flexible tube and the magnitude of the negative pressure generated. It is desirable. In addition, it is desirable that a concave portion for locking the rigid cylindrical member to fix the position of the rigid cylindrical member is formed on the inner wall of the flexible tubular body. Alternatively, the occlusion prevention structure is further provided with a clip body that is attached to the outer periphery of the flexible tubular body and fixes the position of the rigid tubular member by crimping the flexible tubular body to the tubular member. You may prepare. Further, when the flexible tubular body is bent in advance, the flexible tubular body is divided into two tubular bodies at the arrangement position of the rigid tubular member, and the two tubular bodies are the same. It is desirable to be connected by inserting the rigid cylindrical member. In this case, at least the outer surface of the rigid tubular member is covered with an insulating material, or the connecting portion of the two tubular bodies is covered with an insulating material, so that the insulating property at the connecting portion of the two tubular bodies is increased. It is desirable to ensure. Further, the rigid cylindrical member has a pair of outer seal portions that protrude radially outward in the vicinity of both ends thereof and closely contact the inner peripheral surface of the flexible tubular body, and a diameter at a position closer to the inner side than the outer seal portion. An outer seal provided on one end side of the outer surface of the rigid cylindrical member, and a pair of inner seal portions projecting outward in the direction and closely contacting the inner peripheral surface of the flexible tubular body Insulating the connecting portion of the two pipes by applying an insulating coating to the region from the intermediate position between the outer seal portion and the inner seal portion to the intermediate position between the outer seal portion and the inner seal portion provided on the other end side It is also desirable to ensure the sex.

  In another preferred aspect, in the case where the negative pressure acting portion includes a flexible tube body having flexibility and a rigid tube body having rigidity and attached to a fixing member, the blocking prevention structure is provided. Is a structure in which the flexible tube has a length that cannot be closed, and the rigid tube is attached to the fixing member so as to be able to advance and retract.

  In another preferred aspect, in the case where the negative pressure acting portion includes a flexible tube body having flexibility, the strength of the flexible tube body is configured to be uneven in the circumferential direction. .

  In another preferable aspect, when the negative pressure acting part includes a flexible tubular body having flexibility, a water-repellent coating is applied to the inside of the flexible tubular body.

  In another preferred aspect, the negative pressure acting portion is a flexible and large-diameter outer flexible tube, and a flexible and small-diameter inner flexible tube, wherein the outer An inner flexible tube inserted into the flexible tube.

  In another preferred aspect, in the case where the negative pressure acting portion includes a flexible tube made of a flexible material, the blocking prevention structure covers the outer periphery of the flexible tube. A rigid covering for preventing the outer diameter of the sex tube from expanding. In this case, the rigid covering is a cylindrical body having a rigidity that can inhibit elastic deformation of the flexible tube, and has an inner diameter that is substantially the same as the outer diameter of the flexible tube. It is desirable to have a cylindrical body. Further, the rigid covering is an incomplete cylindrical body formed in an arc shape so that both ends of the plate material are close to or in contact with each other, and an elastic deformation causes a gap amount between the both ends to pass through the flexible tube. An incomplete cylindrical body that can be changed to a possible size, and the blockage preventing structure further flexes the incomplete cylindrical member while inhibiting an increase in the gap amount between both ends of the incomplete cylindrical body. It is also desirable to have a clip body or a band that binds the incomplete cylindrical body so as to be crimped to the sex tube. In addition, it is desirable that the rigid covering body is composed of a pair of half-cylinders that are brought into a cylindrical shape by attracting and fixing each other.

  In another preferred aspect, in the case where the negative pressure acting portion includes a flexible tube made of a flexible material, the blocking prevention structure has a spiral shape in which a wire having shape retention is formed in a spiral shape. This is a structure in which a wire is arranged inside the flexible tube.

  According to the present invention, since the negative pressure acting portion where the internal pressure becomes negative when the fuel cell is stopped is provided with the blockage inhibiting structure that inhibits the blockage due to the negative pressure, the possibility of freezing while being blocked is low. As a result, the fuel cell can be restarted quickly.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of a fuel cell system 10 according to a first embodiment of the present invention. The fuel cell system 10 includes a fuel cell 12 configured as an FC stack in which a large number of cells are stacked.

  The FC stack configuring the fuel cell 12 is configured by stacking a large number of cells. In each cell, an MEA configured by sandwiching an electrolyte membrane made of an ion exchange membrane between a fuel electrode (anode electrode) and an air electrode (cathode electrode) is further sandwiched between a pair of separators. A diffusion layer and a catalyst layer are formed on the fuel electrode, and a fuel gas such as hydrogen gas is supplied. The supplied fuel gas is diffused in the diffusion layer and then reaches the catalyst layer. In the catalyst layer, hydrogen is separated into protons (hydrogen ions) and electrons. Hydrogen ions pass through the electrolyte membrane and move to the air electrode, and electrons move through the external circuit to the air electrode.

  A diffusion layer and a catalyst layer are also formed on the electric electrode, and an oxidant gas such as air is supplied. The oxidant gas supplied to the air electrode is diffused in the diffusion layer and reaches the catalyst layer. In the catalyst layer, water is generated by a reaction between the oxidant gas, hydrogen ions that have reached the air electrode through the solid polymer electrolyte membrane, and electrons that have reached the air electrode through the external circuit. Electrons passing through an external circuit during the reaction at the fuel electrode and the air electrode are used as electric power for a load connected between both terminals of the FC stack.

  When the fuel cell is driven, hydrogen gas is supplied from a fuel supply source (not shown). The hydrogen gas supplied from the fuel supply source is pressurized by the air compressor 14 and then supplied to the humidification module 16. In the humidification module 16, the supplied hydrogen gas is mixed with the hydrogen offgas (anode offgas) recovered from the fuel cell 12 and humidified. The mixed gas obtained as a result of mixing is supplied as fuel gas to the fuel cell 12 through the fuel supply pipe 20a.

  The hydrogen gas that has not been consumed in the fuel cell 12 is recovered by the humidification module 16 through the fuel recovery pipe 20b as hydrogen off-gas containing moisture. As described above, a part of the recovered hydrogen off-gas is mixed with unused hydrogen gas and supplied to the fuel cell 12 again. Further, the hydrogen off-gas that has not been resupplied is diluted by the hydrogen diluter 18 and then discharged to the outside through the muffler 19.

  Further, when the fuel cell 12 is driven, air is also supplied to the fuel cell 12. The air is pressurized by an air compressor (not shown) and then supplied to the fuel cell 12 via the air supply pipe 20c. In addition, air off-gas that is air that has not been consumed by the fuel cell 12 is discharged to the outside through the air recovery pipe 20d.

  Here, the configuration of the pipes 20a, 20b, 20c, and 20d connected to the fuel cell 12 will be briefly described. FIG. 2 is a schematic diagram showing the configuration of a certain pipe 20. One end of the pipe 20 is connected to the fuel cell 12, and the other end is connected to another constituent member (for example, the humidification module 16), and gas is carried into and out of the fuel cell 12 as necessary. In the present embodiment, an opening / closing valve 22 is provided in the middle of the pipe 20. This is because when the driving of the fuel cell 12 is stopped, communication between the fuel cell 12 and the external environment is hindered and the fuel cell 12 is sealed. That is, when the fuel cell 12 is stopped, when the fuel cell 12 and the external environment remain in communication with each other, oxygen present in the air reaches the fuel cell 12 through the various pipes 20, and the oxygen and the fuel cell. Reaction with 12 catalyst layers occurs. As a result, there has been a problem that the catalyst layer is prematurely deteriorated. Therefore, when the driving of the fuel cell 12 is stopped, the open / close valve 22 provided in the pipe 20 is closed to seal the fuel cell 12. Thereby, the inflow of oxygen to the fuel cell 12 when the fuel cell is stopped can be prevented. As a result, the life of the catalyst layer, and hence the life of the fuel cell 12 can be improved.

  By the way, in the case of such a configuration, a portion of the pipe 20 closer to the fuel cell than the opening / closing valve 22 is connected to the fuel cell 12 even after the opening / closing valve 22 is closed, and is sealed together with the fuel cell 12. A portion of the pipe 20 closer to the fuel cell than the opening / closing valve 22 has an internal pressure lower than the atmospheric pressure when the fuel cell is stopped. Hereinafter, a portion closer to the fuel cell than the on-off valve 22 is referred to as a “negative pressure acting portion 24”, and a portion closer to the outside than the on-off valve 22 is referred to as a “negative pressure non-acting portion 25”.

  Here, the principle that the internal pressure of the negative pressure acting part 24 becomes negative when the fuel cell 12 is stopped will be briefly described. Even if the on-off valve 22 is closed when the fuel cell 12 is stopped, the negative pressure acting portion 24 remains in communication with the fuel cell 12. Gases such as fuel gas and air remaining in the negative pressure acting portion 24 communicating with the fuel cell 12 reach the catalyst layer of the fuel cell 12 and are consumed. As a result, the internal pressure of the negative pressure acting part 24 becomes a negative pressure lower than the atmospheric pressure. When such a negative pressure occurs, the following problems occur.

  Usually, the pipe 20 connected to the fuel cell is required to have a certain degree of flexibility in order to facilitate the assembling work of each component of the fuel cell system 10, such as the fuel cell 12 and the humidification module 16. Further, the pipe 20 is required to have a high pressure resistance in order to allow passage of the compressed and high pressure gas. Further, in order to insulate the fuel cell 12, it is also desired that the pipe 20 be made of an insulating material. Conventionally, a high pressure rubber hose has been frequently used to construct a pipe that satisfies these conditions.

  However, the conventional piping represented by the high pressure rubber hose has sufficient countermeasures against high pressure, but it cannot be said that countermeasures against negative pressure are sufficient. Therefore, when the fuel cell 12 is stopped and the inside of the negative pressure acting part 24 in the pipe 20 becomes negative pressure, the negative pressure acting part 24 is deformed and closed by this negative pressure. And when left in this cold state for a long time in a cold environment, the negative pressure acting part 24 may freeze while being closed. In this case, even if the fuel cell 12 is to be restarted, the supply or recovery of the fuel gas or the like is hindered due to the blockage. As a result, there is a problem that the fuel cell 12 cannot be restarted quickly.

  Therefore, in the present embodiment, the configuration of the negative pressure acting portion 24 that becomes negative pressure when the fuel cell is stopped in the pipe 20 (that is, the portion of the pipe 20 closer to the fuel cell than the opening / closing valve 22) is special. . Note that the negative pressure non-acting portion 25, which is a portion closer to the outer side than the opening / closing valve 22, is not required to have negative pressure resistance, and thus is configured with a high pressure rubber hose 29 as in the prior art. Below, the structure of the negative pressure action part 24 is explained in full detail.

  FIG. 3 is a schematic cross-sectional view of the negative pressure operation unit 24. The negative pressure acting part 24 is composed of a rubber hose 30 that connects the fuel cell 12 and the open / close valve 22. The rubber hose 30 is a high pressure rubber hose that has been widely used in the fuel cell system 10 conventionally, and has high pressure resistance, insulation, and flexibility. One end of the rubber hose 30 is connected to a battery side pipe 34 protruding from the fuel cell 12, and the other end is connected to a valve side pipe 36 connected to the opening / closing valve 22. Note that each of the battery side pipe 34 and the valve side pipe 36 is a cylindrical member made of a rigid material, and has a strength that does not block even if a negative pressure is generated.

  The length of the rubber hose 30 is such a length that can prevent conduction due to moisture generated when the fuel cell 12 is driven, and is flexible enough to facilitate assembly of the components of the fuel cell system 10. It has become. However, when the rubber hose 30 is lengthened to some extent, there is a problem that the amount of deformation at the time of negative pressure action increases and becomes blocked. In order to prevent this problem, in this embodiment, a blockage inhibiting structure that blocks the blockage of the rubber hose 30 is formed.

  The blockage inhibiting structure is configured by arranging a collar 32 inside the rubber hose 30. The collar 32 is a cylindrical member made of a rigid material, for example, a metal or a rigid resin, and has a rigidity that does not deform even when a negative pressure is generated when the driving of the fuel cell 12 is stopped. The outer diameter of the collar 32 is the same as or slightly larger than the inner diameter of the rubber hose 30, and the length thereof is sufficiently shorter than that of the rubber hose 30.

  In the present embodiment, the collar 32 is arranged inside the rubber hose 30 with an appropriate interval. More specifically, in the collar 32, the interval D between the adjacent rigid cylindrical members (collar 32, battery side pipe 34, valve side pipe 36) inside the rubber hose 30 prevents the rubber hose 30 from being blocked by negative pressure. It is arranged to be as long as possible. That is, the portion of the rubber hose 30 in which the rigid cylindrical member is disposed is not deformed and does not close even if a negative pressure is generated inside when the fuel cell 12 is stopped. On the other hand, since the portion where the rigid cylindrical member is not arranged is not rigidly reinforced by the rigid cylindrical member, deformation occurs when negative pressure is generated. However, when the distance D of the portion where the rigid cylindrical member is not disposed is short, the deformation amount of the rubber hose 30 when subjected to negative pressure has to be reduced, and as a result, the rubber hose 30 is not blocked. . That is, by disposing the collar 32 inside the rubber hose 30 with an appropriate interval, even if the rubber hose 30 is lengthened, the rubber hose 30 can be prevented from being blocked, and the fuel cell 12 is reliably insulated. be able to. In addition, by arranging the collar 32 at an appropriate interval, the entire rubber hose 30 does not become highly rigid, but partially has a flexible structure, so that the assembly work of each constituent member is easy. it can. In addition, the space | interval D of the rigid cylindrical members which can prevent obstruction | occlusion of the rubber hose 30 can be determined based on the magnitude | size of the negative pressure which arises, and the deformation | transformation characteristics (strength, shape, etc.) of the rubber hose 30. For example, when the generated negative pressure is −60 kPa, the inner diameter of the rubber hose is 30 mm, and the thickness of the rubber hose is 5.5 mm, the interval between the rigid cylindrical members is preferably 60 mm or less.

  As is apparent from the above description, according to the present embodiment, the rubber hose 30 can be prevented from being blocked without impairing the insulating property of the fuel cell 12 and the ease of assembling of each component member. As a result, even after the fuel cell system 10 is left in a cold environment for a long time, the fuel cell system 10 can be restarted quickly. In FIG. 3, only one collar 32 is arranged on one rubber hose 30, but a larger number of collars 32 may be arranged according to the length of the rubber hose 30.

  As is clear from the above description, in order to prevent the rubber hose 30 from being blocked, it is important to securely fix the collars 32 at desired positions. This is because when the arrangement position of the collar 32 is shifted and the interval D between the rigid cylindrical members is changed, the rubber hose 30 may be blocked by negative pressure. Therefore, it is desirable to provide a fixing means for securely fixing the collar 32 at a desired position.

  Various methods are conceivable as fixing means for fixing the position of the collar 32. For example, a recess for accommodating and locking the collar 32 and restricting the movement of the collar may be provided inside the rubber hose 30. . That is, as shown in FIG. 4, a recess 31 is formed in the inner wall surface of the rubber hose 30 at a position where the collar 32 is desired to be accommodated. At this time, if the outer diameter of the collar 32 is substantially the same as the inner diameter of the rubber hose 30 in the recess 31, the end of the collar 32 disposed in the recess 31 is locked to the step portion of the recess 31. As a result, the movement is restricted. As a result, the position of the collar 32 inside the rubber hose 30 is fixed.

  Further, as another color fixing means, a clip body 40 that presses the outer periphery of the rubber hose 30 and press-bonds the rubber hose 30 to the collar 32 may be used. FIG. 5 is a diagram illustrating a usage state of the clip body 40. The clip body 40 is a ring body having an inner diameter slightly smaller than the outer diameter of the rubber hose 30, and an elastic body 40a such as rubber is provided on the inner peripheral surface thereof. When the clip body 40 is press-fitted into the rubber hose 30 and attached to the arrangement position of the collar 32, the elastic body 40a of the clip body 40 presses the outer periphery of the rubber hose 30. With this pressing force, the rubber hose 30 is pressure-bonded to the collar 32 and restricts the movement of the collar 32. As a result, the position of the collar 32 is fixed.

  In the above description, the linear rubber hose 30 is described as an example. However, in order to avoid interference with other members, a rubber hose 30 that is bent in advance may be used. In this case, as shown in FIG. 6, it is desirable to divide the rubber hose 30 into two tubular bodies 42 a and 42 b in advance and join the two tubular bodies 42 a and 42 b with a collar 32. That is, in the case of the rubber hose 30 formed to be bent, the passage of the collar 32 tends to be inhibited at the bent portion, and it is often difficult to arrange the collar 32 at a desired position. Therefore, in this case, the rubber hose 30 is cut at the position where the collar 32 is disposed and divided into two tubular bodies 42a and 42b. Then, one collar 32 is inserted into the two tubular bodies 42a and 42b generated by this division, and the two tubular bodies 42a and 42b are joined. Thereby, even if it is the bent rubber hose 30, the collar 32 can be arrange | positioned in a desired position. As a result, even when the rubber hose 30 is bent, it can be reliably prevented from being blocked. Even when two divided pipe bodies 42a and 42b are joined by the collar 32 as shown in FIG. 5, a fixing means for fixing the position of the collar 32, for example, the recess 31 or the clip body 40 is provided. It is desirable.

  By the way, when the two tubular bodies 42a and 42b generated by the division are joined by the collar 32, a gap 44 is inevitably generated between the joined tubular bodies 42a and 42b. At this time, when the collar 32 is made of a conductive material, the outer peripheral surface of the collar 32 is exposed from the gap, and the insulation performance of the negative pressure acting portion 24 as a whole is lowered. Therefore, in the case where the collar 32 is made of a conductive material, an adhesive having an insulating property may be applied to the end faces of the pipe bodies 42a and 42b to fill the gap 44 between the pipe bodies 42a and 42b. desirable. Alternatively, insulation may be achieved by winding an insulating tape around the ends of the tubular bodies 42a and 42b so as to cover the gap 44. As another method, an insulation coating may be applied to the outer surface of the collar 32 to achieve insulation. Needless to say, the collar 32 may be formed of an insulating material having rigidity, for example, a rigid resin, to take measures against insulation.

  Next, a second embodiment will be described. The second embodiment is substantially the same as the first embodiment except that the configuration of the negative pressure acting part 24 in the pipe is different. Therefore, below, it demonstrates centering around the structure of the negative pressure action part 24 in 2nd embodiment. FIG. 7 is a schematic configuration diagram of the negative pressure operation unit 24 in the second embodiment.

  In the second embodiment, the negative pressure acting part 24 includes a first rubber hose 30a connected to the battery side pipe 34, a second rubber hose 30b connected to the valve side pipe 36, and a rigid pipe connecting the both rubber hoses 30a and 30b. 46 is provided.

  Each of the first rubber hose 30a and the second rubber hose 30b is a high pressure rubber hose having high pressure resistance, flexibility, and insulation, like the rubber hose 30 in the first embodiment. However, unlike the first embodiment, the first and second rubber hoses 30a and 30b have a length that does not block even if negative pressure occurs. That is, the first and second rubber hoses are shorter than 30a and 30b and the rubber hose 30 in the first embodiment.

  The rigid pipe 46 is a rigid tube made of a rigid material such as metal, and connects the first rubber hose 30a and the second rubber hose 30b. Since the rigid pipe 46 has sufficient rigidity, naturally, even if the internal pressure becomes negative as the fuel cell 12 stops, no blockage occurs.

  That is, in this embodiment, both the rubber hoses 30a and 30b and the rigid pipe 46 are configured not to be closed even if negative pressure is generated. On the other hand, in the present embodiment, since the flexible rubber hoses 30a and 30b are short, it is difficult to obtain sufficient flexibility, and the assembly work of each component of the fuel cell system 10 may be complicated. .

  Here, normally, the negative pressure action part 24 is attached to a fixing member (for example, a vehicle chassis) via a bracket or the like. Conventionally, although the negative pressure acting part 24 is completely fixed to the fixing member, the negative pressure acting part 24 itself has flexibility, so that the flexibility can be secured. However, in this embodiment, as described above, there is a possibility that sufficient flexibility cannot be obtained because the flexible rubber hoses 30a and 30b are short. Therefore, in the present embodiment, the rigid pipe 46 is attached to the fixing member 48 in a state where the rigid pipe 46 can be advanced and retracted to ensure flexibility and facilitate the assembly work.

  Specifically, the rigid pipe 46 of this embodiment is attached to the fixing member 48 via the bracket 50. The bracket 50 is a metal fitting that clamps the rigid pipe 46 and is bolted to the fixing member 48. The fixing member 48 is formed with a long hole 48a through which the bolt 50a is inserted. When the bolt 50a is inserted into the long hole 48a, the bracket 50, and hence the rigid pipe 46 sandwiched between the bracket 50, can advance and retreat in the long axis direction of the long hole 48a. By moving the rigid pipe 46 back and forth, the assembly position error of each component of the fuel cell system 10 can be absorbed. As a result, even if the rubber hoses 30a and 30b having flexibility are short, the respective constituent members can be easily assembled.

  As is clear from the above description, according to the present embodiment, it is possible to easily assemble the constituent members while preventing the negative pressure acting portion 24 of the pipe 20 from being blocked. Note that the configuration of the bracket 50 described here is an example, and other configurations may be used as long as the rigid pipe 46 to be held can be advanced and retracted relative to the fixing member 48.

  Next, a third embodiment will be described. In the third embodiment, the shape of the rubber hose 30 used for the negative pressure acting portion 24 is a special shape. FIG. 8 is a schematic cross-sectional view of the negative pressure acting part 24 in the third embodiment.

  The negative pressure operating portion 24 of this embodiment includes a rubber hose 30 that connects the fuel cell 12 and the open / close valve 22. The rubber hose 30 has high pressure resistance, insulation, and flexibility, as in the first embodiment. Further, the rubber hose 30 has such a length that the fuel cell 12 can be reliably insulated and flexible enough to easily assemble each member. However, unlike the first embodiment, the rubber hose 30 has nonuniform strength in the circumferential direction.

  Specifically, as shown in FIG. 8A, the rubber hose 30 has a circular outer diameter shape but an elliptical inner diameter shape. Therefore, the thickness of the rubber hose 30 decreases as it approaches the elliptical long axis X, and increases as it approaches the short axis Y. In other words, the thickness in the circumferential direction is not uniform. Naturally, it can be said that the thinner the portion, the lower the strength, and the thicker the portion, the higher the strength. Therefore, when the internal pressure of the rubber hose 30 becomes a negative pressure, a thin portion with low strength, that is, the vicinity of the major axis X of the ellipse is most easily deformed. As a result, when the negative pressure is generated, the rubber hose 30 is deformed in the direction in which the thin portion near the long axis X is closed, but the thick portion near the short axis Y is difficult to deform. And when it sees as the rubber hose 30 whole, as shown in FIG.8 (b), it will not completely obstruct | occlude.

  That is, by making the strength of the rubber hose 30 non-uniform in the circumferential direction, the amount of deformation when the negative pressure is generated becomes non-uniform in the circumferential direction, and as a result, blockage is less likely to occur. As a result, the rubber hose 30 can be prevented from being blocked without impairing the insulating properties and flexibility, and the fuel cell 12 can be restarted quickly.

  Of course, the rubber hose 30 may have another form as long as the strength is not uniform in the circumferential direction. For example, as shown in FIG. 9, even when the outer diameter shape is circular and the inner diameter shape is substantially triangular, the possibility of blockage can be reduced. Further, the rubber hose 30 with non-uniform strength may be applied to the first embodiment and the second embodiment described above. That is, by making the rubber hose 30 in the first embodiment and the first and second rubber hoses 30a and 30b in the second embodiment non-uniform in thickness as in this embodiment, the possibility of blockage can be further reduced.

  Next, a fourth embodiment will be described with reference to the drawings. The fourth embodiment is the same as the third embodiment except for the form of the rubber hose 30 in the negative pressure operation unit 24. Therefore, below, it demonstrates focusing on the form of the rubber hose 30 in the negative pressure action part 24. FIG.

  FIG. 10 is a cross-sectional view of the negative pressure application unit 24 in the present embodiment. The negative pressure acting part 24 includes a large-diameter outer hose 30c and a small-diameter inner hose 30d inserted into the outer hose 30c. Since the outer hose 30c has a larger diameter than the inner hose 30d, the amount of gas to be conveyed is large. On the other hand, the outer hose 30c is deformed when the internal pressure becomes negative because the wall thickness is smaller than the inner diameter. Easy to block. On the other hand, the inner hose 30d has a smaller diameter than the outer hose 30c, and therefore the amount of gas to be conveyed is small. However, since the inner hose 30d is thicker than the inner diameter, the inner hose 30d has a characteristic that it is difficult to block even if negative pressure occurs. In order to further reduce the possibility of blockage, the inner diameter of the inner hose 30d is desirably equal to or less than the thickness of the inner hose 30d.

  In the negative pressure acting portion 24 having such a configuration, when the internal pressure becomes negative, the state illustrated in FIG. That is, the outer hose 30c is deformed and closed by the negative pressure. On the other hand, since the inner hose 30d is thicker than the inner diameter, even if it becomes a negative pressure, it hardly deforms and does not block. Therefore, even if it is left standing in a cold environment for a long time and freezes in this state, the gas can be conveyed through the inner hose 30d.

  Of course, since the inner hose 30d has a small inner diameter, the amount of gas that can be conveyed is small. Therefore, it is difficult to convey the gas for sufficiently driving the fuel cell 12 with the inner hose 30d alone. However, the gas conveyed by the inner hose 30d is usually a high-pressure and high-temperature gas. If this high-temperature gas is supplied to the inner hose 30d, the freezing of the outer hose 30c is quickly eliminated by the temperature of the gas. Also, the freezing of the outer hose 30c is quickly eliminated by the heat generated from the fuel cell 12 as it is driven. As a result, even if the outer hose 30c is frozen while closed, if it is restarted, the freezing is quickly eliminated, and the fuel cell 12 can be normally driven in a relatively short time. That is, according to the present embodiment, it is possible to improve the performance of the fuel cell 12, particularly the cold resistance, without impairing the flexibility and insulation of the rubber hose 30.

  In the present embodiment, only one inner hose 30d is used, but naturally a larger number of inner hoses 30d may be used. Moreover, you may apply this embodiment to 1st embodiment mentioned above, 2nd embodiment, and 3rd embodiment. That is, the performance of the fuel cell 12 can be further improved by inserting the small-diameter inner hose 30d into the rubber hose 30 in the first, second, and third embodiments.

  Next, a fifth embodiment will be described. The fifth embodiment is substantially the same as the first embodiment, except that the configuration of the negative pressure operating unit 24 in the pipe is different. Therefore, hereinafter, the configuration of the negative pressure operation unit 24 in the fifth embodiment will be mainly described. FIG. 12 is a schematic configuration diagram of the negative pressure application unit 24 in the fifth embodiment.

  As in the first embodiment, a rubber hose 30 that connects the fuel cell 12 and the open / close valve 22 is provided in the negative pressure operating portion 24 in the fifth embodiment. As described above, the rubber hose 30 is blocked and deformed when a negative pressure is applied, and in winter, the rubber hose 30 may be frozen while being blocked and deformed.

  Therefore, in order to prevent the rubber hose 30 from being closed and deformed, in the present embodiment, a rigid covering body 60 that partially covers the outer periphery of the rubber hose 30 and prevents the outer diameter of the rubber hose 30 from expanding is provided.

  The rigid covering body 60 is a cylindrical body made of a material having a certain degree of rigidity such as a rigid resin (plastic or the like) or metal, and the inner diameter thereof is substantially the same as the outer diameter of the rubber hose 30. Therefore, when the rigid covering 60 is inserted outside the rubber hose 30, the inner peripheral surface thereof is in close contact with the outer peripheral surface of the rubber hose 30. And by this close contact relationship, expansion of the outer diameter of the rubber hose 30 can be prevented, and as a result, blockage deformation of the rubber hose 30 can be prevented.

  This will be described with reference to FIG. Fig.13 (a) is CC sectional drawing in FIG. Before the rubber hose 30 is deformed, the outer peripheral surface of the rubber hose 30 is in close contact with the inner peripheral surface of the rigid cover 60 as shown in FIG. FIG. 13B is an image diagram showing a state when the rubber hose 30 is about to be closed and deformed by a negative pressure. As shown in FIG. 13 (b), when the outer diameter of a part of the rubber hose 30 (the outer diameter in the horizontal direction in the illustrated example) is reduced due to the blocking deformation, the other part to absorb the reduction. The outer diameter (the outer diameter in the vertical direction in the illustrated example) increases. In other words, when the rubber hose 30 is closed and deformed, the outer diameter of a part of the rubber hose 30 is always increased. However, in this embodiment, the rigid covering body 60 which adheres to the outer peripheral surface of the rubber hose 30 is provided, and the outer diameter expansion of the rubber hose 30 is prevented over the entire circumference. As a result, the outer diameter of the rubber hose 30 does not increase, and as a result, blockage deformation is prevented.

  That is, according to this embodiment in which the rigid covering body 60 is provided, it is possible to reliably prevent the rubber hose 30 from being closed and deformed. In addition, since the rigid covering body 60 of the present embodiment is installed outside the rubber hose 30, it can be installed relatively easily as compared with the collar provided inside the rubber hose 30 as in the first embodiment. Can do.

  The length of the rigid covering 60 is not particularly limited as long as it is shorter than the rubber hose 30, and the number thereof is not particularly limited. However, like the collar 32 described in the first embodiment, this rigid covering 60 also does not impair the flexibility of the rubber hose 30 and prevents the rubber hose 30 from being blocked over the entire length of the rubber hose 30. It is desirable that the length and number be as much as possible.

  By the way, when the rubber hose 30 has a straight shape, a cylindrical body (rigid covering body 60) having an annular cross section as described above can be inserted. However, when the rubber hose 30 is bent, the cylindrical hose 30 is already described. It becomes difficult to mount the cylindrical body. Therefore, when the rubber hose 30 is bent, a rigid cover having the following special shape is used.

  FIG. 14 is a schematic side view of the bent rubber hose 30 with a special-shaped rigid covering 62 attached thereto. 15A is a perspective view of the rigid covering body 62, and FIG. 15B is a cross-sectional view taken along DD in FIG.

  The rigid covering 62 is an incomplete cylindrical body formed in an arc shape so that both ends of the metal plate are close to or in contact with each other. From another viewpoint, it can be said that the rigid covering 62 has a substantially C-shaped cross section obtained by cutting the side surface of the cylindrical body in the axial direction.

  The thickness and material of the rigid covering 62 are adjusted so that appropriate elasticity can be exerted, and the amount of gap between both ends can be changed to a size that allows the rubber hose 30 to pass by elastic deformation. ing. By providing the rigid covering 62 with such elasticity, it is possible to attach it to the rubber hose 30 from the side.

  That is, when the rigid covering 62 is attached to the bent rubber hose 30, the operator makes the gap portion of the rigid covering 62 larger than the outer diameter of the rubber hose 30 as shown by a two-dot chain line in FIG. As much as possible, the rigid covering 60 is elastically deformed. And the rubber hose 30 is made to relatively approach into the inside of the rigid covering 62 while maintaining this state. Then, when the hand is released from the rigid covering 60, the rigid covering 62 returns to a substantially cylindrical shape that is in close contact with the outer peripheral surface of the rubber hose 30 by the elastic restoring force, and is attached to the rubber hose 30.

  When the rigid covering 62 is attached to the rubber hose 30, the operator uses the fixing member 63 to fix the rigid covering 62 to the rubber hose 30. Here, the fixing member 63 binds the rigid covering body 62 so as to press the rigid covering body 62 against the rubber hose 30, and is, for example, a worm type band or a spring type clip. By being fixed by the fixing member 63, the gap amount between both ends of the rigid covering body 62 is prevented from being enlarged.

  In this fixing, the rigid covering 62 may be tightened too much, and the inner diameter of the rigid covering 62 may be smaller than the outer diameter of the rubber hose 30. Such excessive reduction of the inner diameter of the rigid covering 62 is undesirable because it induces deformation of the rubber hose 30. Therefore, in the present embodiment, a pair of abutting bodies 62a that stand up to oppose each other at both circumferential ends of the rigid covering body 62 are provided. The pair of abutting bodies 62a abuts each other when the rigid covering body 62 becomes substantially the same as the outer diameter of the rubber hose 30, thereby further elastically deforming the rigid covering body 62 in the diameter reduction direction. To prevent. In other words, by providing the contact body 62a, the inner diameter of the rigid covering body 62 can always be kept at a suitable value.

  As is clear from the above description, the rigid covering body 62 that is an incomplete cylindrical body can be easily attached to the bent rubber hose 30. Then, by attaching the rigid covering 62 to the rubber hose 30, as in the case illustrated in FIG. 13B, the diameter of the rubber hose 30 can be prevented from being increased, and the rubber hose 30 can be prevented from being blocked.

  Further, when the rubber hose 30 is bent, a rigid covering 64 as shown in FIGS. 16 and 17 may be used. FIG. 16 is a schematic side view when the rigid cover 64 having a special shape is attached to the bent rubber hose 30. FIG. 17 is a perspective view of the rigid cover 64.

  The rigid covering body 64 is composed of a pair of half-cylinder bodies 65 that are brought into a cylindrical shape by being attracted and fixed to each other. The two half cylinders 65 are separable from each other, and the inner diameter thereof is substantially the same as the outer diameter of the rubber hose 30. The rigid cover 64 is attached to the rubber hose 30 by sandwiching the rubber hose 30 between the pair of half cylinders 65 and then pulling and fixing the pair of half cylinders 65 together.

  The pair of half cylinders 65 may be fixed by using known fixing means such as a worm type band or a spring type clip. In this embodiment, in order to make the fixing operation easier, the half cylinder is used. A fixing member is provided on the body 65. The fixing member includes a band body 65a and a band receiving portion 65b. The band body 65a is a band-shaped member extending from the circumferential end of the semi-cylindrical body 65, and a plurality of projections and depressions that are engaged with the band receiving section 65b are formed on the surface thereof. Moreover, the band receiving part 65b is formed in the circumferential direction end part of the half cylinder body 65, and the through-hole which accept | permits the approach of the corresponding band body 65a is formed. When the two half cylinders 65 are attracted and fixed, after inserting the band bodies 65a extending from the one half cylinder 65 into the through holes of the band receiving portions 65b formed in the corresponding half cylinders 65, The band body 65a is tightened. And the unevenness | corrugation of this band body 65a latches to the band receiving part 65b, and the two half cylinder bodies 65 are attracted and fixed.

  As is clear from the above description, the rigid covering body 64 composed of the pair of half cylinders 65 can be easily attached to the bent rubber hose 30. By attaching the rigid covering 64 to the rubber hose 30, the diameter of the rubber hose 30 can be prevented from being enlarged, and the rubber hose 30 can be prevented from being blocked, as in the case shown in FIG.

  Next, a sixth embodiment will be described. The sixth embodiment is substantially the same as the first embodiment, except that the configuration of the negative pressure acting unit 24 in the pipe is different. Therefore, hereinafter, the configuration of the negative pressure operation unit 24 in the fifth embodiment will be mainly described. FIG. 18 is a schematic configuration diagram of the negative pressure application unit 24 in the sixth embodiment.

  Similarly to the first embodiment, a rubber hose 30 that connects the fuel cell 12 and the opening / closing valve 22 is also provided in the negative pressure operation unit 24 in the sixth embodiment. In the present embodiment, in order to prevent the rubber hose 30 from being blocked and deformed, a spiral wire, specifically a coil spring 66, in which a wire having a shape-retaining property is formed in a spiral shape is disposed inside the rubber hose 30. ing. The free outer diameter of the coil spring 66 (the outer diameter when the coil spring 66 is not expanded or contracted) is slightly larger than the inner diameter of the rubber hose 30. Therefore, when the coil spring 66 is inserted into the rubber hose 30, the coil spring 66 comes into close contact with the inner peripheral surface of the rubber hose 30, thereby reliably preventing the diameter reduction of the rubber hose 30. As a result, blocking deformation of the rubber hose 30 is prevented.

  Here, as is well known, the coil spring 66 has flexibility (direction changeability). Therefore, even if the coil spring 66 is disposed inside, the flexibility of the rubber hose 30 is hardly impaired. That is, according to the present embodiment, it is possible to prevent the blocking deformation while maintaining the flexibility of the rubber hose 30.

  Further, the flexibility of the coil spring 66 is advantageous when it is inserted into the rubber hose 30. For example, when the coil spring 66 is inserted into a bent rubber hose 30 as shown in FIG. 19A, the coil spring 66 is deformed in accordance with the bending of the rubber hose 30, so that it is desirable compared to a rigid pipe material such as a collar. It is possible to easily enter the position. Moreover, since the coil spring 66 can maintain the bent state, it can be attached to the bent portion of the rubber hose 30 as shown in FIG. As a result, the blocking deformation of the rubber hose 30 at the bent portion can be reliably prevented.

  As is apparent from the above description, according to the present embodiment using the coil spring 66, the rubber hose 30 can be prevented from being closed regardless of the shape of the rubber hose 30. Further, the mounting operation is easier than in the case of using a rigid pipe material such as a collar.

  Finally, a modification of the embodiment described with reference to FIG. 6 will be described. In the present specification, as shown in FIG. 6, the rubber hose 30 is closed and deformed by joining the two tubular bodies 42 a and 42 b generated by dividing the rubber hose 30 with a collar 32 which is a rigid cylindrical member. The form to prevent is described. It is also described that insulation is applied to the outer surface of the collar 32 to maintain insulation in the gap 44 between the two tubular bodies 42a, 42b. When this insulating coating is applied, it is desirable to provide a seal portion on the collar 32 and further define the range of the insulating coating according to the position of the seal portion. This will be described with reference to FIG.

  FIG. 20 is a schematic side view showing a state in which two pipe bodies 42a and 42b generated by dividing the rubber hose 30 are joined by the collar 32 formed with the seal portions 32a and 32b. As in the case described with reference to FIG. 8, the collar 32 is a cylindrical member made of a rigid material, and its outer shape is substantially the same as or slightly larger than the inner diameter of the rubber hose 30. In the vicinity of both ends of the collar 32, a pair of outer seal portions 32a are provided. Each outer seal portion 32 a is a convex portion that protrudes radially outward and is in close contact with the inner peripheral surface of the rubber hose 30. The outer seal portion 32 a prevents generated water (hydrofluoric acid) passing through the inside of the rubber hose 30 from entering between the outer peripheral surface of the collar 32 and the inner peripheral surface of the rubber hose 30.

  The collar 32 is also provided with a pair of inner seal portions 32b provided on the inner side (side away from the end portion) of the outer seal portion 32a. Each inner seal portion 32 b is also a convex portion that protrudes radially outward and is in close contact with the inner peripheral surface of the rubber hose 30, similarly to the outer seal portion 32 a. The inner seal portion 32 b prevents foreign matter and the like from entering between the outer peripheral surface of the collar 32 and the inner peripheral surface of the rubber hose 30 from the gap 44 between the two tubular bodies 42 a and 42 b.

  Here, in the region between the outer seal portion 32a and the inner seal portion 32b, the outer seal portion 32a prevents foreign matter from entering from the outside of the rubber hose 30, and the inner seal portion 32b prevents foreign matter from entering from the inside of the rubber hose 30. It can be said that it is a prevented area. In the present embodiment, the edge of the insulating coating 70 is located in a region between the outer seal portion 32a and the inner seal portion 32b, in other words, in a region where foreign matter has been prevented from entering.

  That is, the outer surface of the collar 32 is provided with an insulating coating 70 in order to maintain insulation. When a foreign object (such as hydrofluoric acid) comes into contact with the edge of the insulating coating 70, the insulating coating may be peeled off due to an impact during the contact. The insulating coating piece that has been peeled off may cause clogging of the humidifying module, which is a downstream component, and may cause a sealing failure such as an air shut valve. Of course, it is conceivable to apply an insulating coating to the entire surface of the collar 32 so as not to cause an edge portion. In this case, however, the insulating coating is easily peeled off at an edge portion such as an end portion of the collar 32. As a result, there is a possibility that the humidification module is clogged or a seal failure such as an air shut valve is caused.

  In the present embodiment, in order to prevent the insulation coating 70 from peeling off, the outer surface of the collar 32 is moved from an intermediate position between the outer seal portion 32a and the inner seal portion 32b provided on one end side to the other end side. An insulating coating 70 is applied between the provided outer seal portion 32a and the inner seal portion 32b. With this configuration, the edge of the insulating coating 70 is located in a region between the outer seal portion 32a and the inner seal portion 32b, in other words, a region where foreign matter intrusion is prevented. And the edge part of the insulating coating 70 is located in this area | region, and peeling of the insulating coating 70 accompanying the contact of a foreign material and an edge part is prevented. As a result, while preventing the rubber hose 30 from being blocked, it is possible to prevent problems caused by the peeling off of the insulating coating 70, and it is possible to always drive the fuel cell satisfactorily.

  As is clear from the above description, in the first to sixth embodiments, the negative pressure acting portion 24 that generates a negative pressure when the fuel cell is stopped is connected to the negative pressure acting part 24 when the fuel cell is stopped. Compared to the negative pressure non-acting portion that does not occur, the structure is less likely to block. As a result, the fuel cell 12 can be restarted quickly without degrading the workability of assembling each component of the fuel cell system 10 and the insulation of the fuel cell 12. In addition, as long as it makes it difficult to block | close the negative pressure action part 24 compared with a negative pressure non-action part, structures other than the above-mentioned may be sufficient. For example, if the fuel cell 12 is insulated by a member other than the rubber hose 30, a metal bellows hose may be used instead of the rubber hose 30. Since the metal bellows hose has high rigidity, it is difficult to close even if a negative pressure is generated, but sufficient flexibility can be secured. It is also effective to adopt a configuration in which freezing does not occur even if the rubber hose 30 is blocked when negative pressure is generated. For example, as shown in FIG. 11, it is also effective to apply a water repellent coating 56, for example, a fluorine coating, to the inner wall surface of the rubber hose 30 so that moisture hardly remains inside the rubber hose 30. With such a configuration, even when the rubber hose 30 is closed and left in a cold environment, the rubber hose 30 has a small amount of water, so that it is difficult to freeze. As a result, if the opening / closing valve 22 is opened to restart the fuel cell 12, the blockage is immediately eliminated, and the fuel cell 12 can be restarted quickly.

1 is a schematic configuration diagram of a fuel cell system according to a first embodiment of the present invention. It is the schematic which shows the structure of piping in 1st embodiment. It is a schematic sectional drawing of the negative pressure action part in a first embodiment. It is a schematic sectional drawing of the negative pressure action part of another example. It is a schematic sectional drawing of the negative pressure action part of another example. It is a schematic side view of the negative pressure action part of another example. It is the schematic which shows the structure of piping in 2nd embodiment. It is a schematic sectional drawing of the negative pressure action part in 3rd embodiment. It is a schematic sectional drawing of the negative pressure action part of another example. It is a schematic sectional drawing of the negative pressure action part in 4th embodiment. It is a schematic sectional drawing of the negative pressure action part of another example. It is a schematic sectional drawing of the negative pressure action part in 5th embodiment. It is CC sectional drawing in FIG. It is a schematic sectional drawing of the negative pressure action part of another example. It is the perspective view of the rigid coating body of another example, and DD sectional drawing in FIG. It is a schematic sectional drawing of the negative pressure action part of another example. It is a perspective view of the rigid coating body of another example. It is a schematic sectional drawing of the negative pressure action part in 6th embodiment. It is a schematic sectional drawing of the negative pressure action part of another example. It is a figure which shows the modification of the negative pressure action part shown in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Fuel cell system, 12 Fuel cell, 14 Air compressor, 16 Humidification module, 18 Hydrogen diluter, 19 Muffler, 20 Piping, 22 Open / close valve, 24 Negative pressure action part, 25 Negative pressure non-action part, 30 Rubber hose, 32 Color , 34 Battery side pipe, 36 Valve side pipe, 40 Clip body, 46 Rigid pipe, 48 Fixed member, 50 Bracket, 60, 62, 64 Rigid covering body, 63 Fixed member, 65 Half cylinder, 66 Coil spring, 70 Insulation coating.

Claims (20)

A fuel cell system for generating electric power by carrying gas into and out of a fuel cell via one or more pipes,
The pipe includes a negative pressure acting portion where the internal pressure becomes negative when the fuel cell is stopped, and a negative pressure non-acting portion where the internal pressure does not become negative when the fuel cell is stopped,
The negative pressure acting part is provided with a flexibility capable of changing its direction, and further includes a blockage inhibiting structure that inhibits a blockage caused by a negative pressure caused by stopping the fuel cell. The fuel cell system according to claim 1,
The said negative pressure action part is a part sealed in the state connected with the pole of the said fuel cell at the time of a fuel cell stop among the said piping. The fuel cell system according to claim 1 or 2,
When the negative pressure acting part includes a flexible tube made of a flexible material,
The blockage preventing structure has a structure in which one or more rigid cylindrical members made of a rigid material and shorter than the flexible tube are arranged inside the flexible tube. system. The fuel cell system according to claim 3,
The length of the portion of the flexible tube where the rigid cylindrical member is not disposed is determined based on the deformation characteristics of the flexible tube and the magnitude of the negative pressure generated. A fuel cell system. The fuel cell system according to claim 3 or 4, wherein
A fuel cell system, wherein a concave portion is formed on an inner wall of the flexible tubular body to lock the rigid cylindrical member and fix the position of the rigid cylindrical member. A fuel cell system according to any one of claims 3 to 5,
The blocking prevention structure further includes a clip body that is attached to the outer periphery of the flexible tubular body and fixes the position of the rigid tubular member by crimping the flexible tubular body to the tubular member. A fuel cell system. A fuel cell system according to any one of claims 3 to 5,
When the flexible tube is bent in advance,
The flexible tubular body is divided into two tubular bodies at the arrangement position of the rigid tubular member,
The two tube bodies are connected by inserting the same rigid tubular member into the fuel cell system. The fuel cell system according to claim 7, wherein
Covering at least the outer surface of the rigid tubular member with an insulating material, or covering the connecting portion of the two tubular bodies with an insulating material, thereby ensuring insulation at the connecting portion of the two tubular bodies. A fuel cell system. The fuel cell system according to claim 1 or 2,
In the case where the negative pressure acting portion includes a flexible tubular body having flexibility, and a rigid tubular body having rigidity and attached to a fixing member,
The blockage preventing structure is a structure in which the flexible tube body has a length that cannot be closed, and the rigid tube body is attached to the fixing member so as to be movable back and forth. The fuel cell system according to any one of claims 1 to 9,
In the case where the negative pressure acting portion includes a flexible tubular body having flexibility,
The flexible tubular body is configured to have a nonuniform strength in the circumferential direction. The fuel cell system according to any one of claims 1 to 10,
In the case where the negative pressure acting portion includes a flexible tubular body having flexibility,
A fuel cell system, wherein a water-repellent coating is applied to the inside of the flexible tube. The fuel cell system according to any one of claims 1 to 11,
The negative pressure acting part is
An outer flexible tube having flexibility and a large diameter;
An inner flexible tube having flexibility and a small-diameter inner flexible tube inserted into the outer flexible tube;
A fuel cell system comprising: The fuel cell system according to claim 1 or 2,
When the negative pressure acting part includes a flexible tube made of a flexible material,
2. The fuel cell system according to claim 1, wherein the blocking prevention structure includes a rigid covering that covers an outer periphery of the flexible tube and prevents an expansion of the outer diameter of the flexible tube. The fuel cell system according to claim 13, wherein
The rigid covering is a tubular body having a rigidity that can inhibit elastic deformation of the flexible tubular body, and has a substantially same inner diameter as the outer diameter of the flexible tubular body. A fuel cell system characterized by being a body. The fuel cell system according to claim 13, wherein
The rigid covering is an incomplete cylindrical body formed in an arc shape so that both ends of the plate material are close to or in contact with each other, and a gap amount between the both ends can pass through the flexible tube by elastic deformation. It is an incomplete cylindrical body that can be changed to the size,
The blockage preventing structure further prevents the incomplete cylindrical body from being pressed against the flexible tubular body while inhibiting the expansion of the gap between both ends of the incomplete cylindrical body. A fuel cell system comprising a clip body or a band for binding. The fuel cell system according to claim 15, wherein
The incomplete cylindrical body is a pair of abutting bodies that stand to oppose each other at both circumferential ends thereof, and the inner diameter of the incomplete cylindrical body is substantially the same as the outer diameter of the flexible tubular body. A fuel cell system comprising a pair of abutting bodies that prevent further elastic deformation of the incomplete cylindrical body in the direction of diameter reduction by abutting each other when they become the same. The fuel cell system according to claim 13, wherein
The said rigid coating | covering body is comprised from a pair of half cylinder body which becomes a cylindrical shape by mutually attracting and fixing, The fuel cell system characterized by the above-mentioned. The fuel cell system according to claim 17, wherein
The half cylinder has a fixing means for attracting and fixing the corresponding half cylinder,
The fixing means includes a band receiving portion into which a band body protruding from a corresponding half cylinder is inserted, and a band body inserted into a band receiving portion formed in the corresponding half cylinder. Fuel cell system. The fuel cell system according to claim 1 or 2,
In the case where the negative pressure acting part includes a flexible tube made of a flexible material,
2. The fuel cell system according to claim 1, wherein the blocking prevention structure is a structure in which a spiral wire formed by spirally forming a shape-retaining wire is arranged inside the flexible tube. The fuel cell system according to claim 7, wherein
The rigid cylindrical member has a pair of outer seal portions projecting radially outward in the vicinity of both ends thereof and closely contacting the inner peripheral surface of the flexible tubular body, and a radially outer side at a position closer to the inner side than the outer seal portion. And a pair of inner seal portions that stick to the inner peripheral surface of the flexible tubular body,
Out of the outer surface of the rigid cylindrical member, from an intermediate position between the outer seal portion and the inner seal portion provided on one end side to an intermediate position between the outer seal portion and the inner seal portion provided on the other end side. Ensuring insulation in the connecting part of the two pipes by applying an insulating coating to the region,
A fuel cell system.

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