JP5402781B2 - Valve operated by pressure difference and fuel cell system using the valve - Google Patents

Description

The present invention relates to a valve that opens and closes by a pressure difference and a fuel cell system using the valve.

A portable device using a fuel cell system that supplies fuel from a fuel cartridge to a power generation cell via a control valve and a pump is known. In such a fuel cell system, when the environmental temperature becomes high, the internal pressure of the fuel cartridge suddenly rises, and high pressure fuel may act on the control valve, pump, and power generation cell, and may adversely affect these devices. . When the internal pressure of such a cartridge becomes high, a pressure-resistant valve that shuts off the flow path and protects the control valve, the pump, and the power generation cell is required.

Patent Document 1 discloses an emergency shut-off valve that automatically closes a flow path when a fluid flowing in the flow path becomes an abnormal pressure. This emergency shut-off valve includes a spindle attached to a diaphragm provided in a valve body, and a cylindrical valve body that is biased in a closing direction by a spring. A peripheral groove is provided on the outer periphery of the spindle. A notch is provided in the circumference, and a ball that engages with the circumferential groove and the notch is disposed between the spindle and the valve body. When an abnormally high pressure is generated in the valve body, the diaphragm pushes up the spindle against the spring, so the ball moves to the circumferential groove side and comes off the notch. Therefore, the valve element can block the flow path by the biasing force of the spring.

However, the emergency shut-off valve is composed of a large number of parts and has a very complicated structure, which makes it difficult to reduce the size. Moreover, there is a drawback that once it is activated, it cannot be automatically restored. Therefore, it is not suitable as a pressure-resistant valve or control valve for a fuel cell system.

Japanese Utility Model Publication No. 62-2377

An object of the present invention is to provide a valve that can be opened and closed by a pressure difference between inside and outside, has a simple structure, and can be automatically restored.
Another object is to provide a fuel cell system using the valve.

In order to achieve the above object, the present invention is provided between an inlet member having an inlet, an outlet member having an outlet, and between the inlet member and the outlet member, and between the inlet and the outlet. A valve body made of an elastic body that can be deformed in the radial direction, and arranged at the center of the valve body, and is capable of opening and closing one of the inlet or the outlet. A valve body, and a plurality of connecting portions that are provided so as to be inclined with respect to an axis, connecting the inner peripheral surface of the valve body and the outer peripheral surface of the valve body, The valve body is deformed in a radial direction by a differential pressure between the pressure inside the body and the pressure outside, and the inclination angle with respect to the axis of the connection portion changes along with the deformation of the valve body. One of the inlet or outlet is displaced axially Providing a valve wherein the open or closed.

FIG. 1 shows the operation principle of an example of a valve according to the present invention (an example of a normally open type). A valve body 3 is provided between an inlet member 1 having an inlet 1a and an outlet member 2 having an outlet 2a. The valve body 3 is made of a cylindrical elastic body and can be deformed in the radial direction. A valve body 4 capable of opening and closing one of the inflow port 1a and the outflow port 2a (here, the outflow port 2a) is disposed at the center of the valve body 3. Between the inner peripheral surface of the central part of the valve body 3 and the outer peripheral surface of the valve body 4, there are provided a plurality of connecting portions 5 that can change the angle so as to be inclined with respect to the axis. These connecting portions 5 support the valve body 4 at the central position of the valve body 3 and parallel to the axial direction, and convert the radial deformation of the valve body 3 into the axial displacement of the valve body 4. Have. Here, the valve body 4 and the connecting portion 5 are formed integrally with the valve body 3. Since each connection part 5 is provided in the circumferential direction at intervals, the inflow port 1a and the outflow port 2a are mutually connected.

When the pressure difference between the inside and the outside of the valve body 3 is small, the valve body 4 opens the outlet 2a as shown in FIG. Is discharged from the outlet 2a. If the pressure inside the valve body 3 is now higher than the pressure outside, the central portion of the valve body 3 bulges in the radial direction due to the differential pressure. As the valve body 3 bulges, the outer end of the connecting portion 5 is pulled in the radial direction, so that the inclination angle of the connecting portion 5 with respect to the axis is increased. That is, the inclination of the connecting portion 5 changes in the direction perpendicular to the axis. Therefore, the valve body 4 is displaced in the axial direction to close the outflow port 2a and shut off the fluid flow (see FIG. 1B). Thereafter, when the pressure difference between the inside and the outside of the valve body 3 becomes small, the valve body 3 returns to its original state by its own spring elasticity, and the inclination angle of the connecting portion 5 also returns to its original state. Therefore, the valve body 4 is pulled back in the axial direction, and the outflow port 2a is opened (see (c) in FIG. 1). In this case, it can be used as a shutoff valve for preventing the pressure of the fluid flowing from the inlet 1a from becoming excessive.

It is desirable that the valve body, the valve body, and the connection portion are integrally formed of a rubber-like elastic body. That is, the valve main body and the valve body may be formed as separate members and connected via the connection portion, but the number of parts increases and downsizing becomes difficult. On the other hand, if the three parts are integrally formed, it can be constituted by one part, so that the structure is simplified and the size can be easily reduced. In particular, in the case of a fuel cell system for portable equipment, a small valve is required, so that such a request can be met.

The connecting portion has an outer end portion joined to the inner peripheral surface of the valve body and an inner end portion joined to the outer peripheral surface of the valve body extending in a direction perpendicular to the axis, and an intermediate portion connecting both ends is the axis line. It is good also as a shape inclined with respect to. The connecting portion may have a shape inclined with respect to the axial line over its entire length, but durability of both end portions connected to the inner peripheral surface of the valve body and the outer peripheral surface of the valve body becomes a problem for repeated use. . If the R portions are formed at both ends of the connecting portion, the durability is improved, but the angle of the valve body is also reduced because the connecting portion is difficult to change in angle. On the other hand, when both end portions of the connecting portion are perpendicular to the axis and the intermediate portion is inclined, it is possible to achieve both change in the angle of the connecting portion and durability.

The valve body may be formed in an elliptical cross section having an arcuate wall portion and a flat plate wall portion, and may have a structure in which a connection portion is provided between the flat wall portion and the valve body. For example, the valve body may be cylindrical, but a large differential pressure is required for the entire valve body to bulge, and the radial displacement of the valve body is small. Therefore, the axial displacement amount of the valve body with respect to the differential pressure is also reduced. Although it is possible to increase the amount of deformation of the valve body relative to the differential pressure by reducing the overall thickness of the valve body, this reduces the strength of the valve body itself. When the valve body has an elliptical cross section with an arcuate wall and a flat wall, the flat wall has a greater amount of deformation with respect to the differential pressure than the arcuate wall. The flat wall can be greatly deformed even under pressure. Since the connecting portion is provided between the flat wall portion and the valve body, the axial displacement amount of the valve body can be reduced by converting the radial deformation of the flat wall portion into the axial displacement of the valve body. Can be increased. When the valve body has an elliptical cross section, the displacement of the plate body can be further expanded by making the flat wall portion thinner than the arc wall portion, and the strength of the valve body is the arc wall portion. Can be secured.

The outer casing further includes a cylindrical outer casing covering the outer periphery of the valve body, and both axial ends of the outer casing are connected to the inlet member and the outlet member, respectively, and the inner peripheral surface of the outer casing and the outer peripheral surface of the valve main body An external space may be formed between the external space and an external connection port for connecting the external space and the outside to the peripheral wall of the external housing. In this case, the external housing serves as a protective cover for protecting the outer periphery of the valve body, and serves as a regulating member for regulating the bulging amount of the valve body. It can have a role as a space forming member for forming a space. The external space may be communicated with the atmosphere, or a pressure different from atmospheric pressure may be introduced.

A first flange portion and a second flange portion are formed at both axial ends of the valve body, the first flange portion is crimped between one end portion of the external housing and the inlet member, and the second flange portion is It is good also as a structure crimped | bonded between the other end part of the external housing | casing, and the exit member. In this case, since the flanges provided at both ends of the valve body also serve as a sealing material, the space between the external space and the inside of the valve body is securely sealed, preventing fluid leakage when the valve body swells it can.

The valve according to the present invention can be applied to a fuel cell system. The fuel cell system includes a fuel cartridge in which fuel is stored, a pump that sends out fuel from the fuel cartridge, and a power generation cell that generates electric power using the fuel sent out by the pump. The inflow port of the valve according to the present invention may be connected to the fuel cartridge, the outflow port may be connected to the suction port of the pump, and the outflow port may be opened when the valve body is normal. In this case, if the valve body closes the outlet when the internal pressure of the fuel cartridge reaches a predetermined value or more, it can be used as a pressure-resistant valve.

Also, the valve according to the present invention is provided between the pump and the power generation cell of the fuel cell system, the inlet is connected to the discharge port of the pump, the outlet is connected to the power generation cell, and the external connection port is connected to the fuel cartridge. You may connect. In this case, the valve body normally closes the outlet, and the valve body opens the outlet when the discharge pressure of the pump becomes higher than a predetermined value with respect to the internal pressure of the fuel cartridge supplied to the external space. do it. That is, the fuel can be used as a control valve that passes the valve from the pump to the power generation cell during the pump operation and shuts off the fuel flow from the pump to the power generation cell when the pump is stopped.

As described above, according to the valve of the present invention, since the deformation in the radial direction of the valve body is converted into the axial displacement of the valve body through the connection portion, the valve body is operated by the differential pressure inside and outside the valve body, which is extremely simple. A valve with a simple structure can be realized. Consists of a valve body, a valve body, and a connecting part that connects the valve body, so it is easy to downsize, and when the pressure difference disappears, the valve body can be automatically restored to its original state, which is very easy to handle. Easy to be.

It is a figure which shows the operating principle of the valve | bulb which concerns on this invention. It is a longitudinal section of a 1st embodiment of a valve concerning the present invention. It is a perspective view of the valve | bulb shown in FIG. It is IV-IV sectional drawing of FIG. It is the longitudinal cross-sectional view of the valve body used for the valve | bulb shown in FIG. 2, VV sectional drawing, and a perspective view. It is a deformation | transformation comparison figure of the valve main body of a circular cross section and the valve main body of an oval cross section. It is sectional drawing of the other example of a valve body. It is a figure which shows the relationship between the internal pressure of a valve main body, and the displacement amount of a valve body. It is a figure which shows the relationship between the inclination-angle of a connection part, and the displacement amount of a valve body. It is operation | movement explanatory drawing of the valve | bulb shown in FIG. It is a block diagram of an example which applied the valve | bulb which concerns on this invention to the fuel cell system. It is a block diagram of the example which applied the valve | bulb of 2nd Embodiment which concerns on this invention to the fuel cell system. It is sectional drawing of 3rd Embodiment of the valve | bulb which concerns on this invention.

[First Embodiment]
2 to 5 show a first embodiment of a valve according to the present invention. The valve A includes a valve body 10 made of a rubber-like elastic body (for example, silicon rubber), an inlet member 20 having an inflow port 21, an outlet member 30 having an outflow port 31, and an external housing 40. Yes. The inlet member 20, the outlet member 30, and the external housing 40 are formed of a hard material (for example, resin, metal, etc.).

As shown in FIG. 5, the valve body 10 includes a cylindrical body portion 11 and disk-shaped flange portions 12 and 13 that are integrally formed at both ends of the body portion 11. The body 11 of the valve body 10 of this example is formed in an oval cross section having an arcuate wall 11a and a flat wall 11b, and the flat wall 11b is thinner than the arcuate wall 11a. Is formed. A round shaft-like valve element 14 is arranged at the center of the body part 11, and the valve element 14 and the flat plate-like wall part 11 b are connected by a pair of band-like connecting parts 15. In this example, the valve body 14 and the connection portion 15 are integrally formed with the valve body 10. The connecting portion 15 is provided so as to be inclined with respect to the axis at an angle θ (0 <θ <90 °). The connecting portion 15 serves as a support member that supports the valve body 14 at the center position of the valve main body 10 so as to be parallel to the axial direction, and the bulging deformation of the valve main body 10 is changed to the axial displacement of the valve body 14. It has a role as a conversion member for conversion.

One end portion of the inlet member 20 is provided with a convex portion 22 fitted to one end side of the body portion 11 of the valve main body 10, and the inflow port 21 is opened at the center of the convex portion 22. A convex part 32 fitted to the other end side of the body part 11 of the valve body 10 is also provided at one end part of the outlet member 30, and the outlet 31 is open at the center of the convex part 32. The connecting portion 15 is inclined toward the inflow port 21 from the outer peripheral end to the inner peripheral end, and in a normal state, one end portion of the valve body 14 is close to the convex portion 32 at a position facing the outflow port 31. In position. Therefore, the outlet 31 is normally opened to constitute a normally open valve. The valve body 14 is far away from the inlet 21.

The outer casing 40 is formed in a cylindrical shape covering the outer periphery of the valve body 10, and both axial ends of the outer casing 40 are connected and fixed to the inlet member 20 and the outlet member 30, respectively. Therefore, an external space 41 is formed between the inner peripheral surface of the external housing 40 and the outer peripheral surface of the valve body 10. In particular, in this embodiment, since the body 11 of the valve body 10 has an oval cross section, the two external spaces 41 are provided at symmetrical positions (see FIG. 4). Two external connection ports 42 for supplying external pressure to the external space 41 are formed on the peripheral wall of the external housing 40. One flange portion 12 of the valve body 10 is pressure-bonded between one end portion of the outer housing 40 and the inlet member 20, and the other flange portion 13 is interposed between the other end portion of the outer housing 40 and the outlet member 30. It is crimped. Therefore, the space between the external space 41 and the internal space of the valve body 10 is securely sealed.

As described above, the body 11 of the valve body 10 of the present embodiment has an oval cross section. The reason will be described below with reference to FIG. As shown in FIG. 6A, when the valve body 10A is formed with a circular cross section having a constant thickness, even when the internal pressure P increases, the amount of deformation in the radial direction is small. For example, in a cylindrical valve body made of silicon rubber (Young's modulus 10 MPa) with an inner diameter of 2 mm, an outer diameter of 3 mm, and an axial length of 3 mm, the amount of deformation in the radial direction when a pressure P of 100 kPa is applied on the inside is about 30 μm. On the other hand, in the case of an elliptical cross section (inner diameter φ2 mm, outer diameter φ3 mm of the arcuate wall portion 11a, inner dimension S1 = 1.7 mm, outer dimension S2 = 2.2 mm of the flat wall portion 11b), The deformation amount of the flat wall portion 11b is about 130 μm, and can be enlarged by about 4 times. In addition, when the thickness of the valve main body 10 can be reduced, or when a soft material can be used for the valve main body 10, it is needless to say that the shape is not limited to the elliptical cross section, and may be a cylindrical shape.

As shown in FIG. 5, the connecting portion 15 of this embodiment has an outer end portion 15 a joined to the inner peripheral surface of the body portion 11 and an inner end portion 15 b joined to the outer peripheral surface of the valve body 14. The intermediate portion 15c that extends in the vertical direction and connects the both end portions is inclined with respect to the axis. The reason is demonstrated compared with the case where the connection part 15 is the shape inclined with respect to the axis line over the full length (refer FIG. 7). In the case of the valve main body 10B having a linear connection portion as shown in FIG. 7, durability of the connection portion connected to the inner peripheral surface of the valve main body 10 and the outer peripheral surface of the valve body 14 becomes a problem for repeated use. Therefore, it is better to form the R portions 15d and 15e at both ends of the connecting portion 15. In that case, since the connection portion 15 is less likely to change in angle, the amount of axial displacement of the valve body 14 when the body portion 11 bulges is reduced. On the other hand, when both end portions 15a and 15b of the connection portion 15 are perpendicular to the axis, and the intermediate portion 15c is inclined, the angle change of the connection portion 15 when the body portion 11 bulges easily. Thus, the axial displacement amount of the valve body 14 can be increased. Moreover, since the load concerning the both ends 15a and 15b of the connection part 15 when the trunk | drum 11 bulges can be reduced, durability can be improved. Of course, the shape of the connecting portion 15 may be as shown in FIG. 7 as long as durability and displacement can be ensured. Further, the connecting portion 15 is not necessarily limited to a belt-like shape, and the valve body 10 is deformed in the radial direction due to a pressure difference between the pressure inside the valve body 10 and the pressure outside the valve body 10, and accompanying the deformation of the valve body 10. Any shape may be used as long as the inclination angle of the connecting portion 15 with respect to the axis changes.

FIG. 8 shows the relationship between the internal pressure of the valve body 10 and the amount of axial displacement of the valve body 14. As is apparent from FIG. 8, the displacement amount of the valve element 14 increases proportionally as the internal pressure increases. However, when the internal pressure increases to 100 kPa or more, the increase rate of the displacement amount of the valve element gradually decreases, and reaches around 150 kPa. If exceeded, the displacement amount of the valve body becomes substantially constant (about 175 μm). Therefore, a reliable valve closing force can be obtained by setting the distance between the valve body and the outlet (or inlet) within a region where the amount of displacement of the valve body changes proportionally.

FIG. 9 shows the relationship between the inclination angle of the connecting portion 15 and the amount of axial displacement of the valve body 14. As can be seen from FIG. 9, the axial displacement amount of the valve body 14 changes with the inclination angle of the connecting portion 15, and the displacement amount of the valve body becomes maximum when the inclination angle is around 55 °. A tilt angle in the range of 50 ° to 65 ° is preferable because a displacement of 110 μm or more can be obtained.

Here, the operation of the valve A configured as described above will be described with reference to FIG. (A) is an initial state, and since the pressure on the inflow side is small and the differential pressure with respect to the pressure in the external space 41 (here atmospheric pressure) is small, the valve body 10 is not deformed. Therefore, the valve body 14 opens the outlet 31, and fluid can flow from the inlet 21 to the outlet 31. (B) shows a state where the pressure on the inflow side rises and the valve body 10 is slightly swollen. In this state, the valve body 14 is slightly displaced toward the outlet 31, but since the outlet 31 is still open, the fluid flowing in from the inlet 21 is discharged to the outlet 31. (C) shows a state where the pressure on the inflow side exceeds a predetermined threshold value and the valve body 10 swells until it comes into contact with the inner wall of the external housing 40. In this state, since the valve body 14 closes the outlet 31, the fluid flow from the inlet 21 to the outlet 31 is blocked. (D) shows a state where the pressure on the inflow side is below the threshold value and the swelling of the valve body 10 is reduced. In this state, since the valve body 14 opens the outlet 31, the fluid that flows in from the inlet 21 is discharged to the outlet 31.

In this manner, the valve body 10 swells due to the differential pressure between the internal pressure and the external pressure, and the valve body 14 is displaced in the axial direction to open and close the outlet, so that it can be used as an emergency shutoff valve. In addition, since the pressure difference between the atmosphere and the internal pressure of the valve body 10 is used, the valve body 14 can also be automatically restored when the internal pressure of the valve body 10 is restored.

FIG. 11 shows an example of a fuel cell system such as a portable device. This system includes a fuel cartridge 50 storing fuel (for example, methanol), a pressure-resistant valve 51, a pump 52 that sends out fuel, a control valve 53 that opens a flow path only during operation of the pump 52, and a power generation cell that generates power using the fuel. 54. When the valve A according to the present invention is used as the pressure-resistant valve 51, the inlet 21 may be connected to the fuel cartridge 50 and the outlet 31 may be connected to the pump 52. In this case, the flow path can be shut off when the internal pressure of the fuel cartridge 50 becomes abnormally high, and the downstream pump 52, control valve 53, and power generation cell 54 can be protected.

[Second Embodiment]
FIG. 12 shows another example of the fuel cell system using the valve B according to the second embodiment of the present invention as a control valve. This valve B is the same as the structure of the valve A of the first embodiment except that the connecting portion 15 is inclined in the opposite direction and the valve body 14 always closes the outlet 31. That is, the connecting portion 15 is inclined toward the outlet 31 from the outer peripheral end to the inner peripheral end. The inflow port 21 is connected to the discharge port of the pump 52, and the outflow port 31 is connected to the power generation cell 54. Further, the fuel cartridge 50 is connected to the external connection port 42.

When the pump 52 is stopped, the pressure inside the valve body 10 of the valve B is low and the pressure in the external space 41 is equal to the internal pressure of the fuel cartridge 50 as shown in FIG. When the internal pressure of the fuel cartridge 50 becomes high for some reason, the pressure is guided to the external space 41. Therefore, the valve body 10 is deformed in a direction compressed toward the inner diameter side due to the pressure increase in the external space 41. Therefore, the valve body 14 is strongly pressed against the outflow port 31, and the valve closing state can be reliably maintained. Therefore, even if the internal pressure of the fuel cartridge 50 becomes abnormally high, fuel is not supplied to the power generation cell 54 by mistake. On the other hand, when the pump 52 is operated, the pressure inside the valve body 10 increases, and when the pressure becomes higher than the pressure in the external space 41, the valve body 10 expands as shown in FIG. Therefore, the valve body 14 connected to the valve main body 10 via the connection portion 15 is displaced to the inflow port side and opens the outflow port 31. As a result, the fuel discharged by the pump 52 is sent to the power generation cell 54 via the outlet 31 and can generate power.

[Third Embodiment]
The shape of the tip of the valve body does not need to be flat as in the first and second embodiments, and the valve seat surface does not need to be planar. Like the valve C shown in FIG. 13, the distal end portion 14 a of the valve body 14 may be spherical, and the opening (valve seat) 31 a of the facing outlet 31 may be tapered. In this case, even if the valve body 14 is slightly tilted due to the bending of the connecting portion 15 or the like, the distal end portion 14a of the valve body 14 is spherical, and the opening 31a of the outlet 31 is tapered. The outlet 31 can be reliably closed.

The present invention is not limited to the above embodiment. In the first to third embodiments, an example in which the outside of the valve body is covered with an external housing and an external space is formed between the outer periphery of the valve body and the inner periphery of the external housing is shown in FIG. Thus, the external housing can be omitted. That is, the inlet member and the outlet member may be directly connected by the valve body. Further, the inlet member, the outlet member, and the external casing do not need to be dedicated parts for the valve, and can be shared by, for example, the casing of the fuel cartridge or the casing of the pump.

In the above embodiment, the example in which the valve body opens and closes the outlet has been described, but the inlet may be configured to open and close. In this case, the valve body may be a normally closed type that normally closes the inlet or a normally open type.

A to C Valve 10 Valve body 14 Valve body 15 Connection portion 20 Inlet member 21 Inlet port 30 Outlet member 31 Outlet port 40 External housing 41 External space 42 External connection port

Claims (8)

An inlet member having an inlet,
An outlet member having an outlet,
A valve main body provided between the inlet member and the outlet member, formed in a cylindrical shape so as to surround a flow path between the inlet and the outlet, and made of an elastic body deformable in the radial direction; ,
A valve body that is disposed at the center of the valve body and that can open and close one of the inlet or the outlet;
A plurality of connection portions capable of changing the angle are provided to connect between the inner peripheral surface of the valve body and the outer peripheral surface of the valve body, and to be inclined with respect to the axis.
The valve body is deformed in the radial direction by a pressure difference between the pressure inside the valve body and the pressure outside, and the angle of inclination with respect to the axis of the connection portion changes along with the deformation of the valve body. A valve characterized in that a body is axially displaced to open or close one of the inlet or the outlet. The valve according to claim 1, wherein the valve body, the valve body, and the connection portion are integrally formed of a rubber-like elastic body. The connecting portion has an outer end connected to the inner peripheral surface of the valve body and an inner end connected to the outer peripheral surface of the valve body extending in a direction perpendicular to the axis, and connecting the both end portions. The valve according to claim 1, wherein the intermediate portion is inclined with respect to the axis. The valve body is formed in an elliptical cross section having an arcuate wall and a flat wall,
The valve according to any one of claims 1 to 3, wherein the connecting portion is provided between the flat wall portion and the valve body. Further comprising a cylindrical outer casing covering the outer periphery of the valve body,
Both axial ends of the outer casing are connected to the inlet member and the outlet member,
An external space is formed between the inner peripheral surface of the outer casing and the outer peripheral surface of the valve body,
The valve according to any one of claims 1 to 4, wherein an external connection port for connecting the external space and the outside is provided on a peripheral wall of the external housing. A first flange portion and a second flange portion are formed at both axial ends of the valve body,
The first flange portion is crimped between one end portion of the outer casing and the inlet member,
The valve according to claim 5, wherein the second flange portion is pressure-bonded between the other end portion of the external housing and the outlet member. In a fuel cell system comprising: a fuel cartridge in which fuel is stored; a pump that sends out fuel from the fuel cartridge; and a power generation cell that generates electric power using the fuel sent out by the pump.
The valve according to any one of claims 1 to 6, wherein the inlet is connected to the fuel cartridge and the outlet is connected to a suction port of the pump between the fuel cartridge and the pump. ,
The valve body normally opens the inlet and the outlet, and the valve body closes the outlet when the internal pressure of the fuel cartridge reaches a predetermined value or more. system. In a fuel cell system comprising: a fuel cartridge in which fuel is stored; a pump that sends out fuel from the fuel cartridge; and a power generation cell that generates electric power using the fuel sent out by the pump.
The inflow port is connected to a discharge port of the pump between the pump and the power generation cell, the outflow port is connected to the power generation cell, and the external connection port is connected to the fuel cartridge. The valve according to 5 or 6 is provided,
The valve body normally closes the outlet, and when the discharge pressure of the pump becomes higher than a predetermined value with respect to the internal pressure of the fuel cartridge supplied to the external space, the valve body A fuel cell system, characterized in that the fuel cell system is opened.

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