JP2011179528A - Tank internal pressure measurement circuit and tank device provided therewith - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably stop the outflow of fluid in a tank in a short time when the pressure sensor is mechanically damaged and the fluid in the tank flows out of the pressure sensor to the outside. Ensure that the amount of spillage.
SOLUTION: A valve block 22 in which an opening 20a formed in an opening 20 of a tank 19 is sealed, a pressure sensor 27 for detecting pressure in the tank 19, and a valve block 22 are provided in the pressure sensor. 27, a pressure detection line 23 for guiding the pressure in the tank 19 to the pressure sensor 27, and an overflow prevention device 28 provided on the upstream side of the pressure sensor 27 of the pressure detection line 23. When the differential pressure between the inlet pressure on the inner space 19a side of the tank 19 and the outlet pressure on the pressure sensor 27 side in the prevention device 28 becomes equal to or higher than the set differential pressure, the pressure detection line 23 is switched from the open state to the closed state. A configuration that operates to change.
[Selection] Figure 1

Description

  The present invention relates to a tank internal pressure measurement circuit provided in a tank mounted on, for example, a fuel cell vehicle, a hydrogen engine vehicle, a compressed natural gas vehicle, and the like, and a tank apparatus including the same.

  As shown in FIG. 11, in a valve unit 3 of a so-called container base valve type that is directly attached to an opening 2 of a hydrogen tank 1 for a fuel cell vehicle, generally, an output line 4, a filling line 5, a discharge line 6 and a pressure detection line 7, and these lines (passages) are provided in the valve block 8.

  The output line 4 is a line used when the hydrogen gas in the hydrogen tank 1 is output to the outside and supplied to a fuel cell (not shown), and is provided with a filter 9, an on-off valve 10 and a pressure reducing valve 11. .

  The filling line 5 is a line used when filling hydrogen gas into the hydrogen tank 1 from the outside, and is provided with a check valve 12.

  The discharge line 6 is provided with a safety valve 13 which is activated when the pressure in the hydrogen tank 1 exceeds a specified pressure or when the temperature of the hydrogen tank 1 exceeds a specified temperature. Thus, the hydrogen gas in the hydrogen tank 1 can be safely released to the outside.

  A pressure sensor 14 is provided in the pressure detection line 7, and the pressure in the hydrogen tank 1 can be detected by the pressure sensor 14. The pressure detection signal detected by the pressure sensor 14 is output to a pressure display unit (not shown) to display the pressure in the hydrogen tank 1.

  For example, a diaphragm type sensor is used as the pressure sensor 14. The diaphragm pressure sensor 14 has a diaphragm as a metal plate, for example, and is provided with a strain gauge. The diaphragm pressure sensor 14 converts a deformation of the diaphragm due to the pressure in the tank into a pressure detection signal to generate a hydrogen tank. The pressure in 1 can be detected.

  However, as shown in FIG. 11, when the pressure sensor 14 and the internal space 1 a of the hydrogen tank 1 are directly communicated with each other via the pressure detection line 7, the hydrogen tank 1 is damaged when the pressure sensor 14 is damaged, for example. All of the high-pressure hydrogen gas inside is discharged to the outside through the pressure detection line 7 and may affect the surrounding environment.

  Since the pressure sensor 14 is generally attached in a state where it is exposed on the outer surface of the valve block 8, it may be damaged by receiving a mechanical impact.

  As a countermeasure, there is a tank pressure measuring circuit 15 shown in FIG. In this circuit 15, the pressure detection line 7 is branched from a branch portion 16 between the on-off valve 10 and the pressure reducing valve 11 of the output line 4, and a pressure sensor 14 is provided in the pressure detection line 7. (For example, refer to Patent Document 1). In this way, even when the pressure sensor 14 is damaged, it is possible to prevent hydrogen gas in the hydrogen tank 1 from being released to the outside of the tank 1 when the on-off valve 10 is closed.

  As another conventional tank pressure measuring circuit, although not shown in the figure, a branch pipe is provided at each of the plurality of hydrogen tanks, and a pressure sensor is attached to each branch pipe. In some cases, it is possible to detect an abnormal pressure sensor by determining whether or not the pressure in each tank detected by the above is within an allowable range (see, for example, Patent Document 2). ).

JP 2007-35445 A JP 2001-317695 A

  However, even in the tank pressure measuring circuit 15 of Patent Document 1 shown in FIG. 12, the hydrogen gas in the hydrogen tank 1 is released to the outside of the tank 1 when the on-off valve 10 is open. . Even if the on-off valve 10 is closed, the hydrogen gas in the output line 4 is released to the outside.

And even if it is the circuit for pressure measurement in a tank of patent document 2, when a pressure sensor is damaged, the outflow of hydrogen gas from the damaged part cannot be prevented.
Further, the cause of damage to the pressure sensor is not only mechanical impact but also brittle fracture due to hydrogen gas when the detection target of the pressure sensor is hydrogen gas. However, Patent Documents 1 and 2 do not consider the breakage of the pressure sensor due to brittle fracture.

  The present invention has been made to solve the above-described problems. When the pressure sensor is mechanically damaged and the fluid in the tank flows out of the pressure sensor, An object of the present invention is to provide a tank pressure measuring circuit capable of reliably stopping the outflow of a fluid in a tank in a short time and a small outflow amount, and a tank apparatus including the same.

  A tank internal pressure measurement circuit according to the present invention is provided in a valve block in which an opening formed in an opening of a tank is sealed, a pressure sensor for detecting pressure in the tank, and the valve block, A pressure detection line for guiding the pressure in the tank to the pressure sensor; and an overflow prevention device provided upstream of the pressure sensor in the pressure detection line, the overflow prevention device comprising the overflow prevention The pressure detection line is closed from an open state in which the pressure detection line is opened when a differential pressure between the inlet pressure on the tank side and the pressure on the pressure sensor in the apparatus exceeds a preset differential pressure. It operates to switch to the closed state.

  According to the tank pressure measurement circuit of the present invention, the pressure in the tank filled with fluid is guided to the pressure sensor through the pressure detection line and can be detected by the pressure sensor. The pressure in the tank can be known from the output.

  According to the overflow prevention device, for example, when the pressure sensor is mechanically damaged and the fluid in the tank flows out from the pressure sensor to the outside, the tank side in this overflow prevention device When the differential pressure between the inlet pressure of the pressure sensor and the pressure on the pressure sensor exceeds a preset differential pressure, the pressure detection line is switched from the open state to the closed state to close the pressure detection line. Can be operated. Thereby, the fluid in the tank can be stopped from flowing out through the pressure detection line.

  In the tank pressure measurement circuit according to the present invention, the pressure detection line provided in the valve block, provided with a filling line for filling a fluid in the internal space of the tank, and branched from the filling line is provided. The overflow prevention device and the pressure sensor may be provided in order from the upstream side of the pressure detection line.

  As described above, when the filling line and the pressure detection line share a part of the line, the structure of the in-tank pressure measuring circuit of the present invention can be made simple and compact, and the processing cost can be reduced. And since the filling line and the pressure detection line share a part of the line, a space free in the valve block can be secured. Therefore, the degree of freedom in designing the tank pressure measuring circuit and other circuits provided in the valve block can be expanded. Also, in the filling line, the line downstream from the branch where the pressure detection line branches (the tank internal space side) can always communicate with the tank internal space. It can always be detected.

  In the tank internal pressure measuring circuit according to the present invention, a discharge line provided in the valve block for discharging a fluid filled in the internal space of the tank, and a pressure in the tank provided in the discharge line. A safety valve that operates to switch from a closed state that closes the discharge line to an open state that opens the discharge line when the pressure exceeds a specified pressure or when the tank temperature exceeds a specified temperature. Provided, the pressure detection line branched from the upstream side of the safety valve of the discharge line is provided, and the overflow prevention device and the pressure sensor are provided in order from the upstream side of the pressure detection line. be able to.

  According to the discharge line provided with this safety valve, when the pressure in the tank becomes higher than the specified pressure due to fire or the like, or when the tank temperature becomes higher than the specified temperature, the safety valve is activated, It switches from the closed state which closes a discharge line to the open state which opens a discharge line, and can discharge the fluid in a tank safely outside.

  If the discharge line and the pressure detection line share a part of the line in this way, the structure of the tank pressure measurement circuit according to the present invention can be simplified and compact, and the processing cost can be reduced. . And since a discharge line and a pressure detection line share a part of line, the space which was vacant in the valve block can be ensured. Therefore, the degree of freedom in designing the tank pressure measuring circuit and other circuits provided in the valve block can be expanded. Also, in the discharge line, the line upstream from the branch where the pressure detection line branches (the tank internal space side) can always communicate with the internal space of the tank, so the pressure sensor controls the pressure in the tank. It can always be detected.

  In the tank pressure measuring circuit according to the present invention, an output line provided in the valve block for allowing the fluid filled in the internal space of the tank to flow out, and in order from the upstream side of the output line. An on-off valve and a pressure reducing valve, provided with the pressure detection line branching from between the on-off valve and the pressure reducing valve of the output line, in order from the upstream side of the pressure detection line, the overflow prevention device and The pressure sensor may be provided.

  According to the output line in which the on-off valve and the pressure reducing valve are provided, by opening and closing the on-off valve, the fluid in the tank can flow out and can be contained in the tank. Then, the fluid in the tank can be decompressed and discharged by the pressure reducing valve.

  If the output line and the pressure detection line share a part of the line in this way, the structure of the tank pressure measurement circuit according to the present invention can be simplified and compact, and the processing cost can be reduced. . And since an output line and a pressure detection line share a part of line, the vacant space can be ensured in the valve block. Therefore, the degree of freedom in designing the tank pressure measuring circuit and other circuits provided in the valve block can be expanded. In the output line, an on-off valve is provided on the upstream line from the branch where the pressure detection line branches, so that the pressure in the tank is detected by the pressure sensor when the on-off valve is open. be able to.

  In the tank pressure measuring circuit according to the present invention, the pressure sensor may be a metal diaphragm type.

  According to this pressure sensor, for example, a strain gauge provided in the metal diaphragm can detect the pressure in the tank by converting the deformation of the metal diaphragm due to the pressure in the tank into a pressure detection signal. The reason why the metal diaphragm is used is that the strength of the diaphragm is high, so that the high pressure in the tank can be detected. Moreover, even if the metal diaphragm is damaged due to embrittlement or corrosion due to the fluid filled in the tank, for example, the outflow of the fluid in the tank can be reliably stopped in a short time by the overflow prevention device, The amount of outflow can be reduced.

  In the tank device according to the present invention, the tank internal pressure measurement circuit according to the present invention is attached to an opening of the tank for a fuel cell vehicle, a hydrogen engine vehicle, or a compressed natural gas vehicle, and hydrogen gas or natural gas is contained in the tank. It is filled with a gas fluid.

  According to the tank device of the present invention, since the tank internal pressure measuring circuit of the present invention is provided, even if the pressure sensor is damaged, the fluid in the tank is Can be reliably stopped in a short time, and the amount of outflow can be reduced. As a result, the influence on the surrounding environment due to the outflow of fluid can be prevented.

  According to the tank pressure measuring circuit of the present invention, when the pressure sensor is mechanically damaged and the fluid in the tank flows out of the pressure sensor, the overflow prevention device It is possible to reliably stop the outflow of the fluid in a short time and to reduce the outflow amount. Thereby, the loss due to the outflow of the fluid in the tank can be reduced, and when the outflow of the fluid affects the surrounding environment, the influence on the surrounding environment can be prevented.

It is a block diagram which shows the circuit for tank internal pressure measurement which concerns on 1st Embodiment of this invention. It is a principal part expanded sectional view of the pressure sensor used for the circuit for tank internal pressure measurement which concerns on the 1st Embodiment. It is an expanded longitudinal cross-sectional view which shows the overflow prevention apparatus used for the circuit for pressure measurement in the tank which concerns on the 1st Embodiment. It is a block diagram which shows the circuit for tank pressure measurement which concerns on 2nd Embodiment of the invention. It is a block diagram which shows the circuit for tank pressure measurement which concerns on 3rd Embodiment of the invention. It is a block diagram which shows the circuit for tank pressure measurement which concerns on 4th Embodiment of the same invention. It is a block diagram which shows the circuit for tank pressure measurement which concerns on 5th Embodiment of the same invention. It is a block diagram which shows the circuit for tank pressure measurement which concerns on 6th Embodiment of the same invention. It is a block diagram which shows the circuit for tank pressure measurement which concerns on 7th Embodiment of the same invention. It is a block diagram which shows the circuit for tank pressure measurement which concerns on 8th Embodiment of the invention. It is a block diagram which shows the conventional circuit for tank pressure measurement. It is a block diagram which shows the other conventional circuit for tank pressure measurement.

  Hereinafter, a first embodiment of a tank pressure measuring circuit and a tank apparatus including the same according to the present invention will be described with reference to FIGS. The tank device 18 including the tank pressure measuring circuit 17 is mounted on, for example, a fuel cell vehicle, a hydrogen engine vehicle, or a compressed natural gas vehicle, and can be used as a fuel tank device. As shown in FIG. 1, the tank device 18 includes a tank 19 and a container base valve type valve unit 21 provided in an opening 20 of the tank 19.

  The tank 19 is a bottomed cylindrical container capable of filling and storing a fluid such as hydrogen gas or natural gas at a high pressure, and has a tank body (not shown). An opening 20 is formed in the tank 19, and the opening 20a formed by the opening 20 communicates with the internal space 19a of the tank body.

  The opening 20 shown in FIG. 1 has a substantially cylindrical shape and a diameter smaller than that of the tank main body, and has an internal thread portion formed on the inner peripheral surface. The opening 20 is also called a base part.

  As shown in FIG. 1, the valve unit 21 includes, for example, a metal valve block 22, and the valve block 22 is screwed into the opening 20 of the tank 19. That is, a small-diameter portion 22a is formed in the lower portion of the valve block 22 shown in FIG. 1, and a male screw portion formed on the outer peripheral surface of the small-diameter portion 22a is a female screw portion formed on the inner peripheral surface of the opening portion 20. Are screwed together. The gap between the inner peripheral surface of the opening 20 of the tank 19 and the outer peripheral surface of the valve block 22 is sealed by a seal structure (not shown).

  As shown in FIG. 1, the valve unit 21 includes a pressure detection line 23, a filling line 24, an output line 25, and a discharge line 26, and each line is a passage formed by a hole.

  As shown in FIG. 1, the pressure detection line 23 is provided in the valve block 22 and is a line for guiding the pressure in the tank 19 to the pressure sensor 27 shown in FIG. The inlet 23 a of the pressure detection line 23 opens at the lower surface of the small-diameter portion 22 a formed at the lower part of the valve block 22 and faces toward the inside of the tank 19. And the outlet 23b of the pressure detection line 23 opens on the upper surface of the large diameter part 22b formed in the upper part of the valve block 22, and is going outside.

  As shown in FIG. 1, a pressure sensor 27 is attached to the outlet 23 b of the pressure detection line 23. Further, an overflow prevention device 28 is provided in the middle of the pressure detection line 23. The overflow prevention device 28 is disposed upstream of the pressure sensor 27 (on the inner space 19 a side of the tank 19), in the large diameter portion 22 b of the valve block 22, and at the tip of the opening 20 of the tank 19. It is provided outside the tank 19 (on-tank) rather than the edge 20b.

  The pressure sensor 27 is for detecting the pressure in the tank 19 as shown in FIG. 1, and is of a diaphragm type as shown in FIG. The diaphragm 29 provided in the pressure sensor 27 is made of, for example, metal and is attached to a sensor case 30, and a plurality of strain gauges 31 are attached to the inner surface of the diaphragm 29.

  Further, as shown in FIG. 2, the pressure sensor 27 has a male screw portion formed on the outer peripheral surface of the lower portion of the sensor case 30, and this male screw portion is formed at the outlet 23b of the pressure detection line 23 shown in FIG. It is screwed onto the female thread.

  According to the pressure sensor 27, the strain gauge 31 provided in the metal diaphragm 29 can detect the pressure in the tank 19 by converting the deformation of the metal diaphragm 29 due to the pressure in the tank into a pressure detection signal. it can. The pressure detection signal output by the pressure sensor 27 is output to a pressure display unit (not shown) via the lead wire 32 to display the pressure in the tank 19. Note that the metal diaphragm 29 is used because the strength of the diaphragm 29 is high, whereby a high pressure (for example, 35 MPa, 70 MPa) in the tank 19 can be detected.

  The overflow prevention device 28 is, for example, as shown in FIG. 3, and the differential pressure PS (=) between the inlet pressure P1 on the internal space 19a side of the tank 19 and the pressure P2 on the pressure sensor 27 side in the overflow prevention device 28. When P1−P2) becomes equal to or higher than a predetermined set differential pressure PT, the pressure detection line 23 is switched from an opened state to a closed state in which the pressure detection line 23 is closed.

  As shown in FIG. 3, the overflow prevention device 28 includes a valve body 33 slidably provided along a predetermined axial direction in the valve block 22, and the valve body 33 is displaced in one W1 direction. Thus, the pressure detection line 23 can be switched from the open state to the closed state to close it. And the valve body 33 can be switched to the open state which opens from the closed state which closes the pressure detection line 23 by displacing to the other W2 direction.

  The valve body 33 is formed in an inverted cup shape, and a hole 33a is formed in the side wall. When the overflow prevention device 28 is in the open state, the fluid flowing in from the inlet 28a flows into the inner space of the valve body 33 through the opening on the inlet 28a side of the valve body 33 as shown by an arrow 34, and the hole It is configured to flow out from the outlet 28b through 33a.

  And the part in which the hole 33a of the valve body 33 is formed functions as a fixed throttle which loses the pressure of the fluid. Accordingly, the outlet pressure P2, which is the pressure of the fluid flowing out from the outlet 28b, is lower than the inlet pressure P1, which is the pressure of the fluid flowing in from the inlet 28a, and the differential pressure PS between the inlet pressure P1 and the outlet pressure P2 is reduced. (= P1-P2) occurs. Due to this differential pressure PS, the valve element 33 receives a driving force in the W1 direction. Further, a spring member 35 is disposed in the valve block 22, and the valve body 33 receives a driving force in the W2 direction by the spring member 35.

  According to the overflow prevention device 28 shown in FIG. 3, when the flow rate of the fluid flowing in from the inlet 28a becomes equal to or higher than a predetermined set flow rate, the differential pressure PS becomes equal to or higher than the predetermined set differential pressure PT, and W1 based on the differential pressure PS. The driving force in the direction (valve closing direction) overcomes the driving force in the W2 direction (valve opening direction) by the spring member 35. As a result, the valve body 33 is displaced in the W1 direction, the hole 33a is blocked by the valve seat 36 formed in the valve body 33 and the valve block 22, and the overflow prevention device 28 is switched to the closed state. it can.

  Next, according to the tank pressure measuring circuit 17 configured as described above and the tank device 18 including the same, as shown in FIG. 1, the pressure in the tank 19 filled with fluid is detected by pressure. It is guided to the pressure sensor 27 through the line 23 and can be detected by the pressure sensor 27. The pressure detection signal output by the pressure sensor 27 is output to a pressure display unit (not shown) to display the pressure in the tank 19.

  According to the overflow prevention device 28, for example, the pressure sensor 27 shown in FIG. 1 is mechanically damaged, and the fluid in the tank 19 flows out from the pressure sensor 27 to the outside. When the differential pressure PS between the inlet pressure P1 on the internal space 19a side of the tank 19 and the pressure P2 on the pressure sensor 27 side in the overflow prevention device 28 becomes equal to or higher than a preset differential pressure PT, this pressure detection line. It is possible to operate so as to switch from an open state where 23 is opened to a closed state where the pressure detection line 23 is closed. Thereby, the fluid in the tank 19 can be prevented from flowing out to the outside (in the atmosphere) through the pressure detection line 23.

  As described above, the overflow prevention device 28 can reliably stop the outflow of the fluid in the tank 19 to the outside in a short time, and can reduce the outflow amount. As a result, loss due to the outflow of fluid in the tank 19 can be reduced, and if the outflow of fluid affects the surrounding environment, the influence on the surrounding environment can be prevented.

  As a cause of the damage of the pressure sensor 27, for example, the metal diaphragm 29 may be brittlely broken by a fluid such as hydrogen gas filled in the tank 19 or corroded by a corrosive fluid. Further, as shown in FIG. 1, the ready-made pressure sensor 27 is generally attached in a state of being exposed on the outer surface of the valve block 22, and may be damaged by receiving a mechanical impact.

  Next, the filling line 24, the output line 25, the discharge line 26 shown in FIG. 1, and the on-off valve 37, the pressure reducing valve 38, the filter 39, the safety valve 40, and the check valve 41 provided in each line will be described. .

  As shown in FIG. 1, the filling line 24 is a line that is provided in the valve block 22 and is used when a fluid such as hydrogen gas is filled into the internal space 19 a of the tank 19 from the outside. The inlet 24a of the filling line 24 opens at the outer peripheral surface of the large diameter portion 22b formed at the upper part of the valve block 22 and faces the outside. The outlet 24 b of the filling line 24 opens at the lower surface of the small-diameter portion 22 a formed at the lower part of the valve block 22 and goes into the tank 19. A check valve 41 is provided in the large diameter portion 22 b of the valve block 22 in the middle of the filling line 24.

  The check valve 41 is opened when the fluid is filled into the tank 19 through the filling line 24, and can be filled into the tank 19. When the tank 19 is filled with fluid, the tank 19 is closed, and the fluid filled in the tank 19 can be prevented from flowing out through the filling line 24.

  As shown in FIG. 1, the output line 25 is provided in the valve block 22 and is used when the fluid filled in the internal space 19 a of the tank 19 is output to the outside and supplied to, for example, a fuel cell (not shown). Line. An inlet 25 a of the output line 25 opens at the lower surface of the small diameter portion 22 a of the valve block 22 and faces the inside of the tank 19. And the exit 25b of the output line 25 opens in the outer peripheral surface of the large diameter part 22b of the valve block 22, and is going outside. In the middle of the output line 25, a filter 39, an on-off valve 37, and a pressure reducing valve 38 are provided in this order from the upstream side (the internal space 19a side of the tank 19).

  However, as shown in FIG. 1, the filter 39 and the on-off valve 37 are closer to the inner space 19 a (in-tank) of the tank 19 than the front end edge 20 b of the opening 20 of the tank 19, and have a small diameter of the valve block 22. It is provided in the part 22a. The pressure reducing valve 38 is provided outside the tank 19 (on-tank) from the front edge 20 b of the opening 20 of the tank 19 and in the large diameter portion 22 b of the valve block 22.

  The filter 39 is for removing foreign substances contained in the fluid when the fluid in the tank 19 flows out through the output line 25.

  The on-off valve 37 is composed of, for example, an electromagnetic valve, and can open or close the output line 25 by opening and closing. When the on-off valve 37 is in an open state, the fluid in the tank 19 can flow out through the output line 25. When the on-off valve 37 is closed, the fluid in the tank 19 can be contained in the tank 19.

  The pressure reducing valve 38 allows the fluid in the tank 19 to flow out through the output line 25 while being decompressed to the outside.

  As shown in FIG. 1, the discharge line 26 is a line that is provided in the valve block 22 and discharges the fluid filled in the internal space 19 a of the tank 19 to the outside. The inlet 26 a of the discharge line 26 opens at the lower surface of the small-diameter portion 22 a of the valve block 22 and goes into the tank 19. The outlet 26b of the discharge line 26 opens at the outer peripheral surface of the large diameter portion 22b of the valve block 22 and faces the outside. A safety valve 40 is provided in the large diameter portion 22 b of the valve block 22 in the middle of the discharge line 26.

  The safety valve 40 changes from a closed state in which the discharge line 26 is closed to an open state in which the discharge line 26 is opened when the pressure in the tank 19 exceeds a specified pressure or when the tank temperature becomes higher than a specified temperature. It operates so as to switch.

  According to the discharge line 26 provided with the safety valve 40, when the pressure in the tank 19 becomes higher than a specified pressure due to a fire or the like, or when the tank temperature becomes higher than a specified temperature, the safety valve 40 is By operating, the closed state in which the discharge line 26 is closed is switched to the open state in which the discharge line 26 is opened, and the fluid in the tank 19 can be safely discharged to the outside.

  Next, a second embodiment of the tank pressure measuring circuit and the tank apparatus including the same according to the present invention will be described with reference to FIG. The difference between the tank device 43 of the second embodiment shown in FIG. 4 and the tank device 18 of the first embodiment shown in FIG. 1 is that, in the first embodiment shown in FIG. The second embodiment shown in FIG. 4 is provided on the outside of the tank 19 (on-tank) rather than the front edge 20b of the opening 20 of the tank 19 and in the large-diameter portion 22b of the valve block 22. Then, the overflow prevention device 28 is provided in the small-diameter portion 22a of the valve block 22 on the inner space 19a side (in-tank) of the tank 19 with respect to the tip edge portion 20b of the opening 20 of the tank 19. .

  Other than this, the second embodiment is the same as the first embodiment, and the same parts are denoted by the same reference numerals, and detailed description thereof is omitted.

  In this way, the tank 19 itself including the opening 20 of the tank 19 can prevent the overflow prevention device 28 from being damaged by an external factor such as an impact received from the outside. Thereby, when the pressure sensor 27 is damaged, it is possible to reliably prevent the fluid in the tank 19 from being discharged to the outside through the pressure detection line 23.

  Further, the overflow prevention device 28 is arranged closer to the inner space 19 a side of the tank 19 than the front edge 20 b of the opening 20 of the tank 19, so that the overflow prevention device 28 has a front edge of the opening 20 of the tank 19. Since it is not exposed to the outside of the portion 20b, a compact tank internal pressure measurement circuit 44 (valve unit 45) and a tank device 43 can be provided according to the demand of the user or the like.

  Next, a third embodiment of a tank internal pressure measuring circuit and a tank apparatus including the same according to the present invention will be described with reference to FIG. The tank device 47 according to the third embodiment shown in FIG. 5 is different from the tank device 18 according to the first embodiment shown in FIG. 1 in the first embodiment shown in FIG. The line 23 is formed separately from each other without being coupled to each other, whereas in the third embodiment shown in FIG. 5, the pressure detection line 23 is located downstream of the check valve 41 in the filling line 24 ( The overflow prevention device 28 and the pressure sensor 27 are provided in order from the upstream side of the pressure detection line 23 (the internal space 19a side of the tank 19). It is in place.

  Other than this, the second embodiment is the same as the first embodiment, and the same parts are denoted by the same reference numerals, and detailed description thereof is omitted.

  Thus, if the filling line 24 and the pressure detection line 23 share a part of the line, the structure of the tank pressure measurement circuit 49 (valve unit 50) and the tank device 47 can be made simple and compact. Processing costs can be reduced. The filling line 24 and the pressure detection line 23 share a part of the line, so that an empty space can be secured in the valve block 22. Therefore, the degree of freedom in designing the tank pressure measuring circuit 49 and other circuits (valve unit 50) provided in the valve block 22 can be expanded. Further, in the filling line 24, the line on the downstream side (the side of the internal space 19 a of the tank 19) from the branching portion 48 where the pressure detection line 23 branches is always in communication with the internal space 19 a of the tank 19. Thus, the pressure in the tank 19 can be always detected.

  Next, a fourth embodiment of a tank internal pressure measurement circuit and a tank apparatus including the same according to the present invention will be described with reference to FIG. The difference between the tank device 52 of the fourth embodiment shown in FIG. 6 and the tank device 47 of the third embodiment shown in FIG. 5 is that, in the third embodiment shown in FIG. The fourth embodiment shown in FIG. 6 is provided on the outside of the tank 19 (on-tank) rather than the front edge 20b of the opening 20 of the tank 19 and in the large-diameter portion 22b of the valve block 22. Then, the overflow prevention device 28 is provided in the small-diameter portion 22a of the valve block 22 on the inner space 19a side (in-tank) of the tank 19 with respect to the tip edge portion 20b of the opening 20 of the tank 19. .

  Other than this, the third embodiment is the same as the third embodiment, and the same parts are denoted by the same reference numerals, and detailed description thereof is omitted.

  Thus, the overflow prevention device 28 is provided on the inner space 19a side (in-tank) of the tank block 19 relative to the front end edge 20b of the opening 20 of the tank 19 and in the small diameter portion 22a of the valve block 22. Since the operations and effects exerted are the same as those described in the second embodiment shown in FIG. 4, their descriptions are omitted.

  Next, a fifth embodiment of the tank internal pressure measuring circuit and the tank apparatus including the same according to the present invention will be described with reference to FIG. The tank device 54 of the fifth embodiment shown in FIG. 7 is different from the tank device 18 of the first embodiment shown in FIG. 1 in the first embodiment shown in FIG. The line 23 is formed separately from each other without being coupled to each other, whereas in the fifth embodiment shown in FIG. 7, the pressure detection line 23 is located upstream of the safety valve 40 (tank 19) in the discharge line 26. And an overflow prevention device 28 and a pressure sensor 27 are provided in this order from the upstream side of the pressure detection line 23 (inside the internal space 19a of the tank 19). It is in place.

  Other than this, the second embodiment is the same as the first embodiment, and the same parts are denoted by the same reference numerals, and detailed description thereof is omitted.

  As described above, the discharge line 26 and the pressure detection line 23 share a part of the line, so that the tank pressure measurement circuit 56 (valve unit 57) and the tank are similar to the third embodiment shown in FIG. Since the structure of the device 54 can be made simple and compact, and there are operations and effects such as reduction in processing costs, the description thereof is omitted.

  Next, a sixth embodiment of the tank internal pressure measuring circuit and the tank apparatus including the same according to the present invention will be described with reference to FIG. The tank device 59 of the sixth embodiment shown in FIG. 8 and the tank device 54 of the fifth embodiment shown in FIG. 7 are different from each other in the fifth embodiment shown in FIG. The sixth embodiment shown in FIG. 8 is provided on the outside of the tank 19 (on-tank) rather than the front edge 20b of the opening 20 of the tank 19 and in the large-diameter portion 22b of the valve block 22. Then, the overflow prevention device 28 is provided in the small-diameter portion 22a of the valve block 22 on the inner space 19a side (in-tank) of the tank 19 with respect to the tip edge portion 20b of the opening 20 of the tank 19. .

  Except this, it is the same as that of the fifth embodiment, and the equivalent parts are denoted by the same reference numerals, and detailed description thereof is omitted.

  In this way, the overflow prevention device 28 is provided on the inner space 19a side (in-tank) of the tank 19 with respect to the front end edge 20b of the opening 20 of the tank 19 and in the small diameter portion 22a of the valve block 22. Since the operations and effects produced by are the same as those described in the second embodiment shown in FIG. 4, their descriptions are omitted.

  Next, a seventh embodiment of the tank internal pressure measuring circuit and the tank apparatus including the same according to the present invention will be described with reference to FIG. The tank device 62 of the seventh embodiment shown in FIG. 9 and the tank device 18 of the first embodiment shown in FIG. 1 are different from those of the first embodiment shown in FIG. The line 23 is formed separately from each other without being coupled to each other, whereas in the seventh embodiment shown in FIG. 9, the pressure detection line 23 includes the on-off valve 37 and the pressure reducing valve 38 of the output line 25. The overflow prevention device 28 and the pressure sensor 27 are provided in this order from the upstream side (the tank internal space 19a side) of the pressure detection line 23.

  Other than this, the second embodiment is the same as the first embodiment, and the same parts are denoted by the same reference numerals, and detailed description thereof is omitted.

  In this way, the output line 25 and the pressure detection line 23 share a part of the line, so that the tank internal pressure measurement circuit 64 (valve unit 65) and the tank are similar to the third embodiment shown in FIG. Since the structure of the device 62 can be made simple and compact, and there are operations and effects such as reduction in processing costs, the description thereof will be omitted.

  However, in the output line 25, an on-off valve 37 is provided on the upstream line from the branching portion 63 where the pressure detection line 23 branches, so that when the on-off valve 37 is open, the pressure in the tank 19 is increased. Can be detected by the pressure sensor 27.

  Next, an eighth embodiment of the tank internal pressure measuring circuit and the tank apparatus including the same according to the present invention will be described with reference to FIG. The tank device 67 of the eighth embodiment shown in FIG. 10 and the tank device 62 of the seventh embodiment shown in FIG. 9 are different from each other in the seventh embodiment shown in FIG. The eighth embodiment shown in FIG. 10 is provided on the outside of the tank 19 (on-tank) rather than the front edge 20b of the opening 20 of the tank 19 and in the large-diameter portion 22b of the valve block 22. Then, the overflow prevention device 28 is provided in the small-diameter portion 22a of the valve block 22 on the inner space 19a side (in-tank) of the tank 19 with respect to the tip edge portion 20b of the opening 20 of the tank 19. .

  Except this, it is equivalent to 7th Embodiment, and an equivalent part is shown with the same drawing code | symbol, and those detailed description is abbreviate | omitted.

  In this way, the overflow prevention device 28 is provided on the inner space 19a side (in-tank) of the tank 19 with respect to the front end edge 20b of the opening 20 of the tank 19 and in the small diameter portion 22a of the valve block 22. Since the operations and effects produced by are the same as those described in the second embodiment shown in FIG. 4, their descriptions are omitted.

  However, in each of the above embodiments, the example in which the tank 19 is filled with hydrogen gas has been described. However, in addition to this, a fluid (gas) that may cause the diaphragm 29 of the pressure sensor 27 to become brittle or corroded. (Or liquid) can be filled into the tank 19. In this case as well, the same operations and effects as the above embodiments can be achieved.

  In each of the above embodiments, for example, as shown in FIG. 1, the overflow prevention device 28 is built in the valve block 22, but instead, the overflow prevention device 28 is replaced with the valve block 22. It is good also as a structure which arrange | positions so that it may expose from an outer surface, and was provided in the outer surface of the valve block 22 through this piping. The pressure sensor 27 is connected to the fluid outlet of the overflow prevention device 28.

  Similarly to the above, the check valve 41, the safety valve 40, the filter 39, the on-off valve 37, and the pressure reducing valve 38 shown in FIG. 1 and the like may be provided on the outer surface of the valve block 22 through a pipe. .

  The output line 25, the filling line 24, the discharge line 26, and the pressure detection line 23 formed in the valve block 22 shown in FIG. 1 and the like are passages formed by holes. Instead, the valve block Each line may be formed by forming a flow path in the interior of 22.

  In addition, the tank apparatus of each of the above embodiments has been described as an example that is mounted on a fuel cell vehicle, a hydrogen engine vehicle, or a compressed natural gas vehicle and used as a fuel tank device. It can also be applied to a cylinder filled with acetylene gas or the like, and further to a tank apparatus filled with a liquid at a desired pressure.

  Further, in each of the above-described embodiments, the pressure sensor 27 has been described by taking a metal diaphragm type as an example. Also good. In addition, although the electric pressure sensor 27 is taken as an example, a Bourdon tube type pressure gauge other than this may be employed according to the measured pressure.

  In each of the above embodiments, the overflow prevention device 28 shown in FIG. 3 has been described as an example. However, an overflow prevention device having a configuration other than this may be used.

  As described above, in the tank pressure measurement circuit and the tank apparatus including the same according to the present invention, the pressure sensor is mechanically damaged, and the fluid in the tank flows out of the pressure sensor to the outside. Sometimes, it is possible to reliably stop the outflow of fluid in the tank in a short time, and to have an excellent effect of reducing the outflow amount. It is suitable to be applied to the tank equipment provided.

17, 44, 49, 56, 64 Tank pressure measurement circuit 18, 43, 47, 52, 54, 59, 62, 67 Tank device 19 Tank 19a Internal space 20 Opening 20a Opening 20b Tip edge 21, 45, 50, 57, 65 Valve unit 22 Valve block 22a Small diameter portion 22b Large diameter portion 23 Pressure detection line 23a, 24a, 25a, 26a, 28a Inlet 23b, 24b, 25b, 26b, 28b Outlet 24 Filling line 25 Output line 26 Release line 27 Pressure sensor 28 Overflow prevention device 29 Diaphragm 30 Sensor case 31 Strain gauge 32 Lead wire 33 Valve body 33a Hole 34 Arrow 35 Spring member 36 Valve seat 37 Opening and closing valve 38 Pressure reducing valve 39 Filter 40 Safety valve 41 Check valves 48, 55, 63 Branch

Claims (6)

A valve block in which the opening formed in the opening of the tank is sealed;
A pressure sensor for detecting the pressure in the tank;
A pressure detection line provided in the valve block for guiding the pressure in the tank to the pressure sensor;
An overflow prevention device provided on the upstream side of the pressure sensor of the pressure detection line,
The overflow prevention device opens the pressure detection line when the differential pressure between the tank side inlet pressure and the pressure sensor side pressure in the overflow prevention device is equal to or higher than a preset differential pressure. A tank internal pressure measurement circuit that operates to switch from an open state to a closed state that closes the pressure detection line. Provided in the valve block, comprising a filling line for filling a fluid in the internal space of the tank;
The pressure detection line branched from the filling line is provided;
The in-tank pressure measurement circuit according to claim 1, wherein the overflow prevention device and the pressure sensor are provided in order from the upstream side of the pressure detection line. A discharge line provided in the valve block for discharging the fluid filled in the internal space of the tank;
An opening provided in the discharge line to open the discharge line from a closed state in which the discharge line is closed when the pressure in the tank exceeds the specified pressure or when the tank temperature exceeds the specified temperature. A safety valve that operates to switch to a state,
The pressure detection line branching from the upstream side of the safety valve of the discharge line is provided,
The in-tank pressure measurement circuit according to claim 1, wherein the overflow prevention device and the pressure sensor are provided in order from the upstream side of the pressure detection line. An output line provided in the valve block for discharging a fluid filled in an internal space of the tank;
An on-off valve and a pressure reducing valve provided in order from the upstream side of the output line,
The pressure detection line branched from between the on-off valve and the pressure reducing valve of the output line is provided;
The in-tank pressure measurement circuit according to claim 1, wherein the overflow prevention device and the pressure sensor are provided in order from the upstream side of the pressure detection line.   The tank pressure measuring circuit according to claim 1, wherein the pressure sensor is a metal diaphragm type.   The tank internal pressure measurement circuit according to any one of claims 1 to 5 is attached to an opening of the tank for a fuel cell vehicle, a hydrogen engine vehicle, or a compressed natural gas vehicle, and hydrogen gas or natural gas is contained in the tank. Tank device filled with gas fluid.

Images