JP6972506B2 - Shutoff valve - Google Patents

Description

The present invention relates to, for example, a shutoff valve used in a hydrogen filling device for filling a fuel cell vehicle (FCV) with hydrogen.

An example of a hydrogen filling device for filling a fuel cell vehicle (FCV) with hydrogen is shown in FIG.
In FIG. 7, a hydrogen gas pipeline 43, which is a fuel filling system, is arranged in a hydrogen filling device whose entire structure is indicated by reference numeral 100, and the hydrogen gas pipeline 43 is filled with a hydrogen bomb 41, which is a hydrogen supply source. The nozzle 42 is connected via a filling hose (not shown). The hydrogen gas pipeline 43 is interposed with a flow meter 44, a flow control valve 45, a hydrogen gas pipeline cooling unit 46, pressure sensors 48A and 48B, a temperature sensor 49, and a shutoff valve 50. The decompression pipe 51 of the decompression mechanism is branched from the hydrogen gas pipe 43, and the decompression pipe 51 is interposed with a shutoff valve 52 (for decompression) and a pressure sensor 48C.
The control device 53 of the hydrogen filling device 100 sends control signals to the flow rate adjusting valve 45, the shutoff valve 50, and 52 based on the measurement signals output from the flow meter 44, the pressure sensors 48A, 48B, 48C, the temperature sensor 49, and other sensors. Is transmitted to control the flow of hydrogen gas in the hydrogen gas pipeline 43 and the depressurization pipe 51.
The shutoff valve 50 of the hydrogen gas pipeline 43 and the shutoff valve 52 of the depressurization pipe 51 are shut off by a control signal from the control device 53 or manually by an operator's judgment in an emergency when a trouble occurs. Reference numerals 54 and 55 are a refrigerant cooling unit and a display device, respectively.

The shutoff valves 50 and 52 are configured so that the shaft provided with the valve body slides, and a sealing material for sealing the sliding portion is provided. As such a sealing material, for example, a directional sealing material (so-called "cup seal") is adopted. However, although the slidability of the shaft is good in the cup seal, there is a problem that the sealability is low.
On the other hand, there are cases where the sealing material for the sliding portion is made of an O-ring or the like to improve the sealing property. However, although the O-ring and the like have good sealing performance, there is a problem that the durability is low.
Therefore, a sealing material having good slidability of the shaft, excellent sealing property, and good durability is desired, but the fact is that it has not been proposed yet.

As another conventional technique, a shutoff valve for high-pressure hydrogen gas that prevents the valve body from scattering has been proposed (see, for example, Patent Document 1).
However, the prior art is not intended to solve the above-mentioned problems.

JP-A-2010-190297

The present invention has been proposed in view of the above-mentioned problems of the prior art, and has good slidability in the sliding portion, reduction of hydrogen gas leakage in the sliding portion, and durability against sliding. Aims to provide a good shut-off valve.

The shutoff valve (30, 30-1) of the present invention accommodates a valve body (2), a rod (1) having one end connected to the valve body (2), and a valve body (12). The valve body accommodating portion (10E) has a portion (10E), and the offset inflow side hydrogen flow path (10B) and the outflow side hydrogen flow path (10D) are communicated with each other, and the rod (1) is an inflow side hydrogen flow path. It extends in the direction orthogonal to the flow path (10B) and the outflow side hydrogen flow path (10D), and the rod (1) reciprocates in the longitudinal direction to the end side to which the valve body (2) is connected. When the valve body (2) is moved, the valve body (2) is separated from the valve seat (12) and opened, and when the rod (1) is moved to the end side to which the valve body (2) is not connected, the valve body (2) is released from the valve seat (2). In the shutoff valve (30, 30-1) that sits on 12) and is closed.
A cup seal (4) having a cross-sectional shape in which the side separated from the valve body (2) protrudes and the side close to the valve body (2) extends to the portion (11A: sliding portion) where the rod (1) reciprocates. The cup seal (4) is arranged so that the expanded side in the cross section is located closer to the valve body (2) than the protruding side.
In the cup seal (4) arranged in a plurality of layers, the sealing property when the side where the cross section is expanded is set to the high pressure side is improved compared to the sealing property when the side where the cross section is projected is set to the high pressure side. Has a direction of performance,
The portion (11A) where the rod (1) reciprocates is on the side where the cross section of the cup seals (4) arranged in a plurality of layers is projected, and the direction in which the rod (1) reciprocates (the rod 1). (Axial direction) A seal member (5A) different from the cup seal (4) is provided on the same side as the cup seal (4) with respect to the inflow side hydrogen flow path (10B) and the outflow side hydrogen flow path (10D). Has been
The other sealing member (5A) is an O-ring, and the O-ring (5A) is arranged in an O-ring accommodating portion near the upper end portion of the rod accommodating portion (11A) near the upper end portion (11B). It is in contact with the rod (1) in the absence of a pressure difference, and is in contact with the rod (1).
It is characterized in that a flow path (7) communicating with the storage space (6) is formed on the cup seal (4) side of the other seal member (5A) on the downstream side of the cup seal (4). ..
Further, the shutoff valve (30, 30-1) of the present invention is a valve body in which a valve body (2), a rod (1) having one end connected to the valve body (2), and a valve seat (12) are formed. It has an accommodating portion (10E), the valve body accommodating portion (10E) communicates the offset inflow side hydrogen flow path (10B) and the outflow side hydrogen flow path (10D), and the rod (1) is on the inflow side. It extends in a direction orthogonal to the hydrogen flow path (10B) and the outflow side hydrogen flow path (10D), and the rod (1) reciprocates in the longitudinal direction to the end side to which the valve body (2) is connected. When the valve body (2) is moved to, the valve body (2) is separated from the valve seat (12) and opened, and when the rod (1) is moved to the end side to which the valve body (2) is not connected, the valve body (2) is opened. In the shutoff valve (30, 30-1) that sits on (12) and is closed.
A cup seal (4) having a cross-sectional shape in which the side separated from the valve body (2) protrudes and the side close to the valve body (2) extends to the portion (11A: sliding portion) where the rod (1) reciprocates. The cup seal (4) is arranged so that the expanded side in the cross section is located closer to the valve body (2) than the protruding side.
In the cup seal (4) arranged in a plurality of layers, the sealing property when the side where the cross section is expanded is set to the high pressure side is improved compared to the sealing property when the side where the cross section is projected is set to the high pressure side. Has a direction of performance,
The portion (11A) where the rod (1) reciprocates is on the side where the cross section of the cup seals (4) arranged in a plurality of layers is projected, and the direction in which the rod (1) reciprocates (the rod 1). (Axial direction) A seal member (5A) different from the cup seal (4) is provided on the same side as the cup seal (4) with respect to the inflow side hydrogen flow path (10B) and the outflow side hydrogen flow path (10D). Has been
The other sealing member (5A) is an O-ring, which is located on the upper end surface (11S) of the upper housing (11) and on the upper end surface (11S) of the rod (1). It is characterized in that it exerts a sealing function by abutting the end portion (1A).
Further, the shutoff valve (30-2) of the present invention has a valve body (2), a rod (1) having one end connected to the valve body (2), and a valve body accommodating portion in which a valve seat (12) is formed. (10E), the valve body accommodating portion (10E) communicates the offset inflow side hydrogen flow path (10B) and the outflow side hydrogen flow path (10D), and the rod (1) has an inflow side hydrogen flow. It extends in a direction orthogonal to the path (10B) and the outflow side hydrogen flow path (10D), and the rod (1) reciprocates in the longitudinal direction to move to the end side to which the valve body (2) is connected. Then, the valve body (2) is separated from the valve seat (12) and opened, and when the rod (1) moves to the end side to which the valve body (2) is not connected, the valve body (2) is moved to the valve seat (12). ), In the shutoff valve (30-2), which is closed.
A cup seal (4) having a cross-sectional shape in which the side separated from the valve body (2) protrudes and the side close to the valve body (2) extends to the portion (11A: sliding portion) where the rod (1) reciprocates. The cup seal (4) is arranged so that the expanded side in the cross section is located closer to the valve body (2) than the protruding side.
In the cup seal (4) arranged in a plurality of layers, the sealing property when the side where the cross section is expanded is set to the high pressure side is improved compared to the sealing property when the side where the cross section is projected is set to the high pressure side. Has a direction of performance,
The portion (11A) where the rod (1) reciprocates is on the side where the cross section of the cup seals (4) arranged in a plurality of layers is projected, and the direction in which the rod (1) reciprocates (the rod 1). (Axial direction) A seal member (5B) different from the cup seal (4) is provided on the same side as the cup seal (4) with respect to the inflow side hydrogen flow path (10B) and the outflow side hydrogen flow path (10D). Has been
The other sealing member (5B) is composed of an on-off valve (5B: tapered on-off valve) of a type in which the tapered surfaces are in contact with each other, and the on-off valve (5B) is an operating portion (1A) at the upper end of the rod (1). ), And a tapered portion (1C: valve body) formed at the upper end of the rod accommodating portion (11A) of the upper housing (11) and having a shape complementary to the tapered portion (1C) of the rod (1). 11D: Valve seat), the on-off valve (5B) is closed by abutting the tapered portion (1C) and the tapered portion (11D), and the tapered portion (1C) and the tapered portion (11D) are separated from each other. It is characterized in that it has a function of opening the on-off valve (5B).

In the present invention, there is a storage space (6: for leaked hydrogen gas, for example) on the downstream side of the shaft seal (4) on the shaft seal (4) side (upstream side) of the other sealing member (5A, 5B). It is preferable that the flow path (7) communicating with the surge tank) is formed.
Then, it is preferable that the flow path (7) or the storage space (6) is provided with a detection device (8: pressure sensor, hydrogen sensor, etc.) for detecting the leaked hydrogen gas.

Here, it is preferable that the other sealing member (5) is composed of an O-ring (5A) made of an elastic material or an on-off valve (5B) of a type in which the tapered surfaces are in contact with each other.

According to the shutoff valve (30) of the present invention having the above configuration, another seal is provided on the downstream side of the shaft seal (4) (the side through which the hydrogen gas leaked from the cup seal 4 flows: the outer side of the shutoff valve 30). Since a member (for example, an O-ring or the like) is provided, even if the shaft seal (4) deteriorates, the hydrogen gas leaking from the shaft seal (4) is blocked by the other seal member (5). , Continuous leakage of hydrogen gas is prevented.
Further, since the shaft seal (4) has good slidability, deterioration due to friction is unlikely to occur, and the frequency of replacement of the shaft seal (4) can be reduced. Therefore, the labor and cost related to the replacement of the shaft seal (4) are reduced.

In the present invention, on the downstream side of the shaft seal (4), a storage space (6: for example, a leaked hydrogen gas tank) is provided on the shaft seal (4) side (upstream side) of the other seal member (5). If the communicating flow path (7) is formed, the hydrogen leaked from the shaft seal (4) does not flow to the side of the other sealing member (5) having a large resistance, and the storage is performed through the flow path (7). It flows into the space (6). Therefore, it is prevented that the hydrogen leaked from the shaft seal (4) leaks out of the shutoff valve (30) or the system of the hydrogen filling device.
Since the amount of hydrogen reaching the other sealing member (5) side is small, there is no inconvenience even if the sealing performance of the other sealing member (5) is not so good. Then, the burden on the other sealing member (5) is reduced.
Further, if a detection device (8: pressure sensor, hydrogen sensor, etc.) for detecting the hydrogen gas leaked to the flow path (7) or the storage space (6) is provided, deterioration of the shaft seal (4) can be detected at an early stage. Can be done.

It is sectional drawing which shows 1st Embodiment of this invention. FIG. 1 is a cross-sectional view showing the vicinity of a valve body in a state where the shutoff valve is open. It is explanatory drawing which shows the operation of a cup seal. It is explanatory drawing which shows the 2nd Embodiment of this invention. It is a partially enlarged sectional view which shows the modification of 1st Embodiment and 2nd Embodiment. It is explanatory drawing which shows the 3rd Embodiment of this invention. It is a block diagram which shows an example of a hydrogen filling apparatus.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
First, a first embodiment of the present invention will be described with reference to FIG.
In FIG. 1, the shutoff valve 30 according to the first embodiment has a columnar main body housing 10, an upper housing 11 fixed to the upper part of the main body housing 10, and a lower lid on the bottom of the main body housing 10. The portion 14 is detachably attached.
On the side surface of the main body housing 10, a hydrogen flow path 10B is continuously formed at the inflow port 10A. Hydrogen gas supplied from a hydrogen supply source (hydrogen cylinder or the like) side (not shown) flows into the inflow port 10A. The hydrogen flow path 10B communicates with the spring accommodating portion 10F, which will be described later. Although not specified, the inflow port 10A is connected to a piping connector (not shown).
In the main body housing 10, the outlet 10C is formed on the side surface opposite to the inlet 10A (on the right side in FIG. 1). The inflow port 10C has a vertical position above the inflow port 10A and faces the inflow port 10A in the circumferential direction of the main body housing 10 (the inflow port 10A with respect to the center of the plane of the main body housing 10). It is arranged at a position symmetrical with respect to the point), and hydrogen gas flows out to the injection nozzle side (downstream side) (not shown).
A hydrogen flow path 10D is continuously formed on the inflow port 10A side (upstream side) of the outflow port 10C, and communicates with the rod accommodating portion 10H of the main body housing 10 of the hydrogen flow path 10D. Although not specified, the outlet 10C is connected to a piping connector (not shown).

A rod accommodating portion 10H, a valve body accommodating portion 10E, and a spring accommodating portion 10F on the main body housing side are formed in the main body housing 10 along a central axis extending in the vertical direction, and are formed in the vicinity of the upper end of the valve body accommodating portion 10E. Is provided with a valve seat 12 of the valve body 2.
In FIG. 1, when the shutoff valve 30 is opened (FIG. 2), the hydrogen gas supplied from the hydrogen supply source flows into the shutoff valve 30 from the inflow port 10A, and the hydrogen flow path 10B, the spring accommodating portion 10F, and the valve. It flows out from the outlet 10C to the injection nozzle side via the body accommodating portion 10E, the main body housing side rod accommodating portion 10H, and the hydrogen flow path 10D. In FIG. 2, the flow of hydrogen gas when the shutoff valve 30 is open is indicated by a solid arrow F. Note that FIG. 1 shows the time when the shutoff valve 30 is shut off, and the hydrogen flow path is shut off when the valve body 2 is seated on the valve seat 12 at the boundary portion between the valve body accommodating portion 10E and the rod accommodating portion 10H. Has been done.
Further, in FIG. 1, an upper housing accommodating portion 10G is formed in a region near the radial center of the upper end portion of the main body housing 10, and a main body housing joint portion formed at the lower end of the upper housing 11 is formed in the upper housing accommodating portion 10G. 11C is housed so that the main body housing 10 and the upper housing 11 are coupled.

The valve body 2 is slidably housed in the valve body accommodating portion 10E in the axial direction (vertical direction in FIG. 1). Here, the valve body 2 may be integrally formed at the lower end of the rod 1, or may be configured separately from the rod 1 and attached to the rod 1.
A spring 3 is housed in the spring accommodating portion 10F, and the spring 3 abuts on the valve body 2 via the valve body pedestal 13 and always urges the valve body 2 in the closing direction (upward in FIG. 1). There is.
As described above, FIG. 1 shows a state in which the shutoff valve 30 is closed, the valve body 2 is pressed against the valve seat 12 by the elastic repulsive force of the spring 3, and the hydrogen flow path in the valve body accommodating portion 10E is closed. doing. When the valve body 2 is pressed against the valve seat 12 by the elastic repulsive force of the spring 3, the rod 1 to which the valve body 2 is fixed at the lower end is also urged upward.
Further, in FIG. 1, a lower rod 15 is continuously provided above the lower lid portion 14, and the lower rod 15 extends into the internal space of the spring 3, and the upper end of the lower rod 15 and the valve body 2 (valve body 2) are provided. The pedestals 13) are separated. The upper end of the lower rod 15 functions as a stopper when the valve body 2 (valve body pedestal 13) moves to the open side (downward in FIG. 1) when the shutoff valve is opened.

In the upper housing 11, the rod accommodating portion 11A on the upper housing side is formed along a central axis extending in the vertical direction. An enlarged portion 11B is formed in the vicinity of the upper end of the rod accommodating portion 11A. A rod 1 (a rod having a valve body 2 at the lower end) is accommodated in the rod accommodating portion 11A, and the rod 1 reciprocates in the axial direction. Reference numeral 1A in FIG. 1 is an operation unit of the rod 1.
In the rod accommodating portion 11A, which is a sliding portion where the rod 1 reciprocates, a cup seal accommodating portion (unsigned) is formed on the main body housing 10 side (lower side in FIG. 1), and the cup seal accommodating portion has a cup seal. A plurality of 4's are accommodated in the vertical direction. Here, the cup seal 4 is an example of "a sealing material having a directionality in sealing performance", and constitutes a shaft seal in the illustrated embodiment. However, the sealing material indicated by reference numeral 4 is not limited to the cup seal as long as it is a sealing material corresponding to "a sealing material having a directionality in sealing performance".
The cup seal 4 has better slidability than the O-ring, but has weaker sealing property. As described above, the cup seal 4 has a directional sealing performance, and the cup seal 4 has a wide cross section (lower side in FIGS. 1 and 3) toward the high pressure side (valve body 2 side). When 4 is arranged, the sealing performance is exhibited. The direction of the sealing performance of the cup seal 4 will be described later with reference to FIG.

In the accommodating portion 11A, the downstream side of the cup seal 4 which is the shaft seal (the side through which the hydrogen gas leaked from the cup seal 4 flows: the outside side of the shutoff valve 30: the upper side in FIG. 1), and the lower end portion of the enlarged portion 11B. An O-ring accommodating portion (unsigned) is formed in the vicinity, and an O-ring 5A (another sealing member 5) made of an elastic material is accommodated in the O-ring accommodating portion.
In FIG. 1, reference numeral 9 is a sealing member (for example, an O-ring) for preventing hydrogen gas from leaking from the joint portion between the main body housing 10 and the upper housing 11.
In the first embodiment of FIG. 1, hydrogen leaked from the hydrogen flow path of the main body housing 10 described above when the shutoff valve 30 is shut off (closed) or opened as in the case of hydrogen filling or depressurization. A cup seal 4 and an O-ring 5A are provided so that the gas (indicated by the arrow L1 of the alternate long and short dash line in FIG. 1) does not leak to the outside of the shutoff valve 30. Since the time for hydrogen gas to leak from the hydrogen flow path of the main body housing 10 is assumed to be the filling time or the depressurization time (for example, about 5 minutes: see FIG. 7), the amount of hydrogen gas leaking is not so large. No.

When hydrogen gas leaks from the cup seal 4 due to deterioration of the cup seal 4 which is a shaft seal, the leaked hydrogen gas flows in a region on the downstream side of the cup seal 4 in the rod accommodating portion 11A (one point in FIG. 1). Chain line arrow L2). However, the leaked hydrogen gas (L2) is shut off by the O-ring 5A, and continuous leakage to the outside of the shutoff valve 30 is prevented.
Here, as described above, since the slidability of the cup seal 4 is good, deterioration due to friction is unlikely to occur (compared to the O-ring), so that the frequency of replacement of the cup seal 4 can be reduced. Therefore, the labor and cost related to the replacement of the cup seal 4 are reduced.
In addition, the O-ring is not low in wear resistance and slidability when there is no pressure difference. Therefore, if the cup seal 4 does not deteriorate and hydrogen does not leak to the O-ring 5A side, the rod 1 does not deteriorate even if it slides. Therefore, the replacement frequency of the O-ring 5A is also reduced. In addition, as shown in FIG. 1, when the end 1A of the rod 1 is separated from the end surface 11S of the upper housing 11, even if hydrogen leaks due to deterioration of the cup seal 4, the O-ring 5A causes the O-ring 5A. , Leakage can be reliably prevented.

In FIG. 2, which shows a main part in a state where the shutoff valve 30 is open, the rod 1 is pushed down to the open side (downward in FIGS. 1 and 2) (arrow A), and the valve body 2 is a spring 3 (see FIG. 1). Moves to the open side (downward in FIGS. 1 and 2) against the elastic repulsive force of (arrow A). Therefore, the valve body 2 is separated from the valve seat 12, and the valve body accommodating portion 10E and the main body housing side rod accommodating portion 10H communicate with each other.
As a result, the shutoff valve 30 is in an open state, and the hydrogen flow path F in FIG. 1 (inflow port 10A → hydrogen flow path 10B → spring accommodating portion 10F → valve body accommodating portion 10E → main body housing side rod accommodating portion 10H → hydrogen flow path 10D → outlet 10C) communicates.

Here, the operation of the cup seal 4 will be described with reference to FIG.
When the cup seal 4 is arranged with respect to the rod 1, when pressure is applied from the protruding side (pointed side: upper in FIG. 3) of the cross section of the cup seal 4 (when the protruding side of the cross section is set to the high pressure side), the cup On the side where the cross section of the seal 4 is widened (lower in FIG. 3), the width direction (left-right direction in FIG. 3) is narrowed, and the cup seal 4 cannot seal the gap with the rod 1.
On the other hand, when pressure is applied from the side where the cross section of the cup seal 4 is expanded (lower in FIG. 3) (when the side where the cross section is expanded is the high pressure side), the widthwise dimension of the expanded side is expanded and the sealing property is improved. improves. Therefore, the cup seal 4 can seal the gap with the rod 1.
Therefore, if the cup seal 4 is arranged with the protruding side of the cross section (upper in FIG. 3) on the low pressure side and the side on which the cross section expands (lower in FIG. 3) on the high pressure side, the sealing performance of the cup seal 4 is arranged. Can be effectively demonstrated. In FIG. 1, the hydrogen flow path side (valve body 2 side: lower in FIG. 1) of the cup seal 4 is the high pressure side, and the side where the cross section of the cup seal 4 is expanded faces the hydrogen flow path side (valve body 2 side). It is arranged.

FIG. 4 shows a second embodiment of the present invention.
The shutoff valve 30-1 of the second embodiment of FIG. 4 differs from the shutoff valve 30 of the first embodiment of FIG. 1 in the following points.
In the shutoff valve 30-1 of the second embodiment, the hydrogen flow path from the rod accommodating portion 11A on the downstream side of the cup seal 4 (shaft seal) and on the cup seal 4 side of the O-ring 5A (another seal member). 7 is branched.
The hydrogen flow path 7 communicates with the surge tank 6 (storage space), and the hydrogen gas leaked in the surge tank 6 can be stored. Further, the surge tank 6 is provided with a pressure sensor 8 as a detection device for detecting the leaked hydrogen gas. However, the pressure sensor 8 may be provided in the hydrogen flow path 7 instead of the surge tank 6. Further, as a detection device for detecting hydrogen gas, a hydrogen sensor may be provided instead of the pressure sensor 8.

In the second embodiment of FIG. 4, when hydrogen gas leaks from the cup seal 4 due to deterioration of the cup seal 4 and flows to the downstream side (upper side in FIG. 4) of the cup seal 4 (dashed-dotted line arrow). L2), the leaked hydrogen gas (L2) does not flow to the O-ring 5A (another sealing member) side having a large flow path resistance, and passes through the hydrogen flow path 7 having a small flow path resistance (dashed-dotted line arrow L3). ), Flows into the surge tank 6 (storage space) (dashed-dotted arrow L4). Therefore, the hydrogen gas leaked from the cup seal 4 (shaft seal) is prevented from leaking out of the system of the shutoff valve 30-1. As described above, hydrogen gas leaks from the cup seal 4 (shaft seal) at the time of filling and at the time of depressurization, and the amount of hydrogen leakage is not so large.
The hydrogen gas leaking to the downstream side (upper in FIG. 4) of the cup seal 4 passes through the hydrogen flow path 7 and flows into the surge tank 6, and the amount of hydrogen gas reaching the O-ring 5A side is small. Therefore, there is no inconvenience even if the sealing performance of the O-ring 5A is not so good, and the burden on the O-ring 5A is reduced.

Here, since the pressure sensor 8 (or hydrogen sensor) is provided in the surge tank 6 or the hydrogen flow path 7 as a detection device for detecting the leaked hydrogen gas, the hydrogen gas is leaking from the cup seal 4. However, it can be detected quantitatively.
Then, it becomes possible to detect the deterioration of the cup seal 4 (shaft seal) at an early stage and understand that the cup seal 4 needs to be replaced.

In the second embodiment, since the shaft seal is composed of the cup seal 4, the pressure on the upstream side (lower side of FIG. 4) of the cup seal 4 (shaft seal) is reduced, and the pressure inside the hydrogen flow path 7 or the surge tank 6 is reduced. When the pressure of the cup seal 4 becomes relatively high, as described with reference to FIG. 3, the side where the cross section of the cup seal 4 protrudes (upper of FIGS. 3 and 4) becomes high pressure, and the cross section of the cup seal 4 narrows. The sealing function is reduced. As a result, the pressure in the hydrogen flow path 7 or the surge tank 6 is released to the upstream side (lower side of FIGS. 1 and 4) of the cup seal 4 (shaft seal), and the pressure in the hydrogen flow path 7 or the surge tank 6 is reduced. Can be done.
On the other hand, when the O-ring is used as the shaft seal instead of the cup seal 4, the sealing performance of the O-ring does not change even if the pressure on the upstream side (lower side of FIG. 4) of the shaft seal decreases. The pressure inside the hydrogen flow path 7 or the surge tank 6 cannot be reduced, and the pressure inside the hydrogen flow path 7 or the surge tank 6 continues to increase. In the second embodiment shown, when an O-ring or other seal having no directionality in sealing performance is used as a shaft seal, it is necessary to separately provide a mechanism for stepping down the pressure inside the hydrogen flow path 7 or the surge tank 6. ..

Other configurations and operational effects in the second embodiment of FIG. 4 are the same as those of the first embodiment of FIG.

FIG. 5 shows modified examples of the first and second embodiments of FIGS. 1 to 4. In the first and second embodiments of FIGS. 1 to 4, the O-ring 5A, which is another sealing member 5, is provided in the rod accommodating portion 11A of the upper housing 11, but is not limited thereto. As shown in the modified example of FIG. 5, the O-ring 5A can be provided at another position.
In the modified example shown in FIG. 5, an O-ring 5A is provided on the end surface 11S of the upper housing 11. By arranging the O-ring 5A on the end surface 11S of the upper housing 11, there is no friction with the O-ring 5A even if the rod 1 slides, and the O-ring 5A does not act as a shaft seal. .. Then, when the end portion 1A of the rod 1 comes into contact with the end surface 11S of the upper housing 11, the O-ring 5A acts as another sealing material 5 and seals the hydrogen leaked due to the deterioration of the coupling 4.

In the embodiment of FIGS. 1 to 4, an O-ring 5A is provided as another sealing member on the downstream side of the cup seal 4 (shaft seal) (the side through which the hydrogen gas leaked from the cup seal 4 flows). , O-ring 5A can be omitted. In the third embodiment shown in FIG. 6, the O-ring 5A of FIGS. 1 and 4 is omitted.
In FIG. 6, a tapered portion 1C (valve body) is formed on the operating portion 1A at the upper end of the rod 1. A tapered portion 11D (valve seat) complementary to the tapered portion 1C of the rod 1 is formed at the upper end of the rod accommodating portion 11A (enlarged portion 11B) of the upper housing 11.
The tapered portion 1C (valve body) of the rod 1 and the tapered portion 11D (valve seat) of the upper housing 11 constitute a tapered on-off valve 5B (a type of on-off valve in which the tapered surfaces abut each other), and the tapered portion 1C (valve body). The taper on-off valve 5B is closed by contacting the taper portion 11D (valve seat) with the taper portion 11D (valve seat), and the taper on-off valve 5B is opened by separating the taper portion 1C) from the taper portion 11D (valve seat). Then, the taper on-off valve 5B constitutes another seal member 5 in the third embodiment.
In FIG. 6, the shutoff valve 30-2 is shut off (closed).

In the third embodiment shown in FIG. 6, the tapered on-off valve 5B (another seal member) formed by the tapered portion 1C (valve body) and the tapered portion 11D (valve seat) is a hydrogen gas leaked from the cup seal 4 (shaft seal). Has a function to block. As described above, the amount of hydrogen gas leaking from the cup seal 4 is not so large.
If both the rod 1 and the upper housing 11 are made of metal, the tapered portion 1C of the rod 1 and the tapered portion 11D of the upper housing 11 are firmly in contact with each other and exhibit high sealing performance. It is not necessary to provide the elastic member of.

Although not shown in FIG. 6, in the third embodiment of FIG. 6, a hydrogen flow communicating with the surge tank 6 is performed on the downstream side of the cup seal 4 (shaft seal) as in the second embodiment of FIG. A road 7 can be provided. Even in that case, if the cup seal 4 deteriorates and hydrogen gas leaks, the gas flows into the surge tank 6 through the hydrogen flow path 7.
Then, a sensor (for example, a pressure sensor or a hydrogen sensor) can be provided in the hydrogen flow path 7 or the surge tank 6 to detect leakage from the cup seal 4 (shaft seal).
Other configurations and operational effects in the third embodiment of FIG. 6 are the same as those of the embodiments of FIGS. 1 to 4.

It should be added that the illustrated embodiment is merely an example and is not a description to the effect of limiting the technical scope of the present invention.
For example, in the illustrated embodiment, the cup seal is selected as the shaft seal 4, but if the slidability is good, a seal member other than the cup seal can be selected. Further, although the O-ring 5 is selected as another sealing member, it is possible to use a sealing member other than the O-ring as long as the sealing property is good.

1 ... Rod 2 ... Valve body 3 ... Spring 4 ... Cup seal (shaft seal)
5 ... Another seal member 5A ... O-ring 5B ... Tapered on-off valve 6 ... Surge tank (storage space)
7 ... Hydrogen flow path 8 ... Pressure sensor (detector)
10 ... Main body housing 11 ... Upper housing 11A ... Rod accommodating portion (sliding portion) on the upper housing side
30 ... Shutoff valve

Claims (5)

It has a valve body (2), a rod (1) having one end connected to the valve body (2), and a valve body accommodating portion (10E) having a valve seat (12) formed therein. ) Communicates the offset inflow side hydrogen flow path (10B) and the outflow side hydrogen flow path (10D), and the rod (1) is the inflow side hydrogen flow path (10B) and the outflow side hydrogen flow path (10D). When the rod (1) reciprocates in the longitudinal direction and moves to the end side to which the valve body (2) is connected, the valve body (2) moves from the valve seat (12). A shutoff valve (30) that is separated and opened, and when the rod (1) moves to the end side to which the valve body (2) is not connected, the valve body (2) sits on the valve seat (12) and is closed. , 30-1)
A plurality of cup seals (4) having a cross-sectional shape in which the side separated from the valve body (2) protrudes and the side close to the valve body (2) expands are laminated on the portion (11A) where the rod (1) reciprocates. The cup seal (4) is arranged so that the extended side in the cross section is located closer to the valve body (2) than the protruding side.
In the cup seal (4) arranged in a plurality of layers, the sealing property when the side where the cross section is expanded is set to the high pressure side is improved compared to the sealing property when the side where the cross section is projected is set to the high pressure side. Has a direction of performance,
The portion (11A) rod (1) is reciprocated, a side where the cross-section of a cup seal disposed by stacking a plurality of (4) protrudes, with in the direction in which the rod (1) is reciprocated flows A seal member (5A) different from the cup seal (4) is provided on the same side as the cup seal (4) with respect to the side hydrogen flow path (10B) and the outflow side hydrogen flow path (10D).
The other sealing member (5A) is an O-ring, and the O-ring (5A) is arranged in an O-ring accommodating portion near the upper end portion of the rod accommodating portion (11A) near the upper end portion (11B). It is in contact with the rod (1) in the absence of a pressure difference, and is in contact with the rod (1).
It is characterized in that a flow path (7) communicating with the storage space (6) is formed on the cup seal (4) side of the other seal member (5A) on the downstream side of the cup seal (4). Shutoff valve. It has a valve body (2), a rod (1) having one end connected to the valve body (2), and a valve body accommodating portion (10E) having a valve seat (12) formed therein. ) Communicates the offset inflow side hydrogen flow path (10B) and the outflow side hydrogen flow path (10D), and the rod (1) is the inflow side hydrogen flow path (10B) and the outflow side hydrogen flow path (10D). When the rod (1) reciprocates in the longitudinal direction and moves to the end side to which the valve body (2) is connected, the valve body (2) moves from the valve seat (12). A shutoff valve (30) that is separated and opened, and when the rod (1) moves to the end side to which the valve body (2) is not connected, the valve body (2) sits on the valve seat (12) and is closed. , 30-1)
A plurality of cup seals (4) having a cross-sectional shape in which the side separated from the valve body (2) protrudes and the side close to the valve body (2) expands are laminated on the portion (11A) where the rod (1) reciprocates. The cup seal (4) is arranged so that the extended side in the cross section is located closer to the valve body (2) than the protruding side.
In the cup seal (4) arranged in a plurality of layers, the sealing property when the side where the cross section is expanded is set to the high pressure side is improved compared to the sealing property when the side where the cross section is projected is set to the high pressure side. Has a direction of performance,
The portion (11A) where the rod (1) reciprocates is on the side where the cross section of the cup seals (4) arranged in a plurality of layers is projected, and the direction in which the rod (1) reciprocates (the rod 1). (Axial direction) A seal member (5A) different from the cup seal (4) is provided on the same side as the cup seal (4) with respect to the inflow side hydrogen flow path (10B) and the outflow side hydrogen flow path (10D). Has been
The other sealing member (5A) is an O-ring, which is located on the upper end surface (11S) of the upper housing (11) and on the upper end surface (11S) of the rod (1). A shut-off valve characterized in that it exerts a sealing function when the end portion (1A) comes into contact with it. It has a valve body (2), a rod (1) having one end connected to the valve body (2), and a valve body accommodating portion (10E) having a valve seat (12) formed therein. ) Communicates the offset inflow side hydrogen flow path (10B) and the outflow side hydrogen flow path (10D), and the rod (1) is the inflow side hydrogen flow path (10B) and the outflow side hydrogen flow path (10D). When the rod (1) reciprocates in the longitudinal direction and moves to the end side to which the valve body (2) is connected, the valve body (2) moves from the valve seat (12). A shutoff valve (30) that is separated and opened, and when the rod (1) moves to the end side to which the valve body (2) is not connected, the valve body (2) sits on the valve seat (12) and is closed. In -2),
A plurality of cup seals (4) having a cross-sectional shape in which the side separated from the valve body (2) protrudes and the side close to the valve body (2) expands are laminated on the portion (11A) where the rod (1) reciprocates. The cup seal (4) is arranged so that the extended side in the cross section is located closer to the valve body (2) than the protruding side.
In the cup seal (4) arranged in a plurality of layers, the sealing property when the side where the cross section is expanded is set to the high pressure side is improved compared to the sealing property when the side where the cross section is projected is set to the high pressure side. Has a direction of performance,
The portion (11A) where the rod (1) reciprocates is on the side where the cross section of the cup seals (4) arranged in a plurality of layers is projected, and the direction in which the rod (1) reciprocates (the rod 1). (Axial direction) A seal member (5B) different from the cup seal (4) is provided on the same side as the cup seal (4) with respect to the inflow side hydrogen flow path (10B) and the outflow side hydrogen flow path (10D). Has been
The other sealing member (5B) is composed of an on-off valve (5B: tapered on-off valve) of a type in which the tapered surfaces are in contact with each other, and the on-off valve (5B) is an operating portion (1A) at the upper end of the rod (1). ), And the tapered portion (11D) formed at the upper end of the rod accommodating portion (11A) of the upper housing (11) and complementary to the tapered portion (1C) of the rod (1). The on-off valve (5B) is closed by abutting the tapered portion (1C) and the tapered portion (11D), and the on-off valve is separated by separating the tapered portion (1C) and the tapered portion (11D). A shutoff valve having a function of opening (5B). Claimed that a flow path (7) communicating with a storage space (6) is formed on the cup seal (4) side of the other sealing member ( 5A, 5B) on the downstream side of the cup seal (4). One of a few shut-off valves. The shutoff valve according to any one of claims 1 and 4, wherein a detection device (8) for detecting leaked hydrogen gas is provided in the flow path (7) or the storage space (6).

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