High-pressure gas storage device

Abstract

To maintain the air tightness of a penetration part of a harness.SOLUTION: A high-pressure gas storage device A comprises: a tank 10 for storing a high-pressure gas; an outer shell body 20 for surrounding the tank 10 with an airtight space 35 as an interval; a penetration hole 38 formed at the outer shell body 20, and penetrating the outer shell body 20 from an internal peripheral side to an external peripheral side; a plurality of electrical apparatuses 40, 43 to 48 provided at the tank 10 or the outer shell body 20; a harness 50 constituted by bundling a plurality of electric wires 51 which are individually connected to the plurality of electrical apparatuses 40, 43 to 48, and cabled in a state of being inserted into the penetration hole 38; and a seal member 60 having elasticity, and regulating the circulation of fluid in a clearance between the penetration hole 38 and the harness 50.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a high-pressure gas storage device. [Background technology]

[0002] Patent Document 1 discloses a double-shell tank in which an inner tank for storing liquefied gas is surrounded by an outer tank. The space between the inner tank and the outer tank is a vacuum space. In this type of device, the inner tank is provided with a sensor for electrically detecting the liquid level, temperature, pressure, etc. of the liquefied gas. In addition, the outer tank is provided with a sensor for electrically detecting the temperature, pressure, etc. in the vacuum space. A harness connected to these electrical devices passes through the outer tank and is led out to the outside of the outer tank. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-152260 A Summary of the Invention [Problem to be solved by the invention]

[0004] Airtightness is required at the harness penetration part in the outer tank. However, since the harness is a bundle of multiple electric wires with a circular cross section, the outer surface of the harness has an uneven shape. Therefore, it is difficult to maintain airtightness at the harness penetration part.

[0005] The present invention was developed in view of the above circumstances, and has an object to maintain airtightness at a passage portion of a harness. [Means for solving the problem]

[0006] The present invention relates to A tank for storing high-pressure gas; an outer shell surrounding the tank with an airtight space; A through hole formed in the outer shell and penetrating from the inner surface side to the outer surface side of the outer shell; A plurality of electrical devices provided in the tank or the outer shell; a harness configured by bundling a plurality of electric wires individually connected to the plurality of electric devices and arranged in a state of being inserted through the through hole; The connector further includes a seal member that has elasticity and regulates the flow of fluid in the gap between the through hole and the harness. Effect of the Invention

[0007] The elastic sealing member regulates the flow of fluid in the gap between the through hole and the harness, so that the portion of the outer shell through which the harness passes can be kept airtight. [Brief description of the drawings]

[0008] [Figure 1] Cross-sectional view of the high-pressure gas storage device of the first embodiment [Diagram 2] An enlarged cross-sectional view showing the seal structure of the harness passing through the outer shell. [Diagram 3] Bottom view showing the state where the seal member is inserted [Figure 4] FIG. 11 is an enlarged cross-sectional view showing a seal structure of a portion where a harness passes through the outer shell of the second embodiment; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] [Description of the embodiments of the present disclosure] First, embodiments of the present disclosure will be listed and described. Any combination of the following embodiments without causing any contradiction is also included in the embodiments for carrying out the present invention.

[0010] It is preferable that the sealing member is made of a single elastic part and has a plurality of seal holes through which the plurality of electric wires pass individually and in an airtight manner. According to this configuration, since the plurality of electric wires pass through the sealing member one by one in an airtight manner, a structure for sealing the gaps between adjacent electric wires is not required.

[0011] It is preferable that the seal member has a pressure-receiving surface facing the airtight space and a sealing surface that is in close contact with a region of the inner surface of the outer shell surrounding the through hole by a pressing force acting on the pressure-receiving surface. With this configuration, the pressure-receiving surface and the sealing surface can prevent leakage of high-pressure gas from a gap between the seal member and the through hole.

[0012] The sealing member is preferably configured to include a molded body in close contact with the plurality of electric wires arranged at a distance from one another, and a seal ring in elastic contact with the outer circumferential surface of the molded body and the inner circumferential surface of the through hole. According to this configuration, since the molded body is in close contact with the plurality of electric wires arranged at a distance from one another, a structure for closing the gap between adjacent electric wires is not required.

[0013] It is preferable that the sealing member is disposed at a position according to the physical properties of the high-pressure gas and the leakage mode of the high-pressure gas from the tank to the airtight space. By setting the position of the sealing member depending on whether the high-pressure gas in the tank leaks into the airtight space in a gaseous state or in a liquid state, it is possible to prevent the leaked high-pressure gas from coming into contact with the sealing member.

[0014] It is preferable that the high pressure gas is ammonia, and the sealing member is disposed within a range of 50% to 80% of the total height range of the airtight space from the lower end. Ammonia leaking in a gaseous state accumulates at the upper end of the airtight space, and ammonia leaking in a liquid state accumulates at the lower end of the airtight space. By disposing the sealing member at a height of 50% to 80% from the lower end of the airtight space, it is possible to prevent ammonia from coming into contact with the sealing member.

[0015] <Example 1> A first embodiment of the present invention will be described below with reference to Figs. 1 to 3. In the following description, the F direction in Fig. 1 is defined as the front with respect to the front-rear direction, and the H direction in Fig. 1 is defined as the top with respect to the up-down direction.

[0016] The high-pressure gas storage device A of the present embodiment 1 is mounted on a vehicle (not shown) for use. Specifically, the high-pressure gas storage device A is disposed inside the vehicle (for example, in the luggage compartment) or outside the vehicle (under the floor of the body). The high-pressure gas storage device A is configured to include a tank 10 and an outer shell 20 that surrounds the tank 10. The tank 10 is an airtight storage tank for storing high-pressure gas (high-pressure liquefied gas and vaporized gas). The liquefied gas is a gas that is in the vapor phase at room temperature and atmospheric pressure and is phase-transitioned to the liquid phase by pressurization and cooling. The high-pressure vaporized gas is a gas generated by evaporation of the liquefied gas.

[0017] The liquefied gas and vaporized gas stored in the high-pressure gas storage device A are used as gas fuel for vehicle engines, specifically, ammonia. Since ammonia is a harmful substance, in this embodiment 1, an outer shell body 20 is provided as a measure in case the high-pressure gas (ammonia gas) in the tank 10 leaks out of the tank 10. The outer shell body 20 is disposed so as to surround the entire tank 10 with a gap therebetween. The space between the outer surface of the tank 10 and the inner surface of the outer shell body 20 functions as an airtight space 35 for temporarily storing the high-pressure gas leaked from the tank 10. The entire area of ​​the outer surface of the tank 10 and the entire area of ​​the inner surface of the outer shell body 20 face the airtight space 35.

[0018] As shown in FIG. 1, the tank 10 has one tube portion 11 and a pair of dome portions 12, and is capsule-shaped as a whole. The tube portion 11 is a cylindrical portion with an axis oriented horizontally (front-rear direction). The pair of dome portions 12 are substantially hemispherical portions and are arranged to close the openings at both ends of the tube portion 11. The tube portion 11 and the pair of dome portions 12 are made of metal members manufactured as separate parts, and are integrated by being joined in an airtight manner by welding. A first mounting hole 13 is formed at the lower end of the tube portion 11, which communicates the inside and outside of the tube portion 11 in the vertical direction. A cylindrical fixing member 14 is fixed in an airtight manner to the opening edge of the first mounting hole 13 by welding.

[0019] The outer shell 20 is configured with a lower case 21 and an upper case 22, which are different components independent of each other. The lower case 21 and the upper case 22 can be combined in the vertical direction, and can also be separated in the vertical direction. The outer shell 20 in the combined state of the lower case 21 and the upper case 22 is capsule-shaped and has a cylindrical surrounding portion 23 and a pair of front and rear dome-shaped covering portions 24. The cylindrical surrounding portion 23 is a cylindrical portion whose axis is oriented in the front-rear direction (horizontal direction). The dome-shaped covering portion 24 is a portion that is approximately hemispherical (bowl-shaped) and is arranged to close the openings at both the front and rear ends of the cylindrical surrounding portion 23.

[0020] The lower case 21 is made of metal and is a member with high rigidity and strength. A lower flange portion 25 is integrally formed around the entire circumference of the opening edge of the upper surface of the lower case 21. A nut 26 is fixed to the lower surface of the lower flange portion 25 by welding. A ring-shaped packing 27 is attached around the entire circumference of the opening edge of the upper surface of the lower case 21. A second mounting hole 28 is formed at the lower end of the lower case 21, which communicates the airtight space 35 with the outside of the lower case 21 in the vertical direction. The second mounting hole 28 is arranged concentrically with the first mounting hole 13. A spacer 29 is arranged to surround the second mounting hole 28 and is fixed airtightly by welding to the lower end of the outer surface of the lower case 21. A blocking member 30 is attached to the lower surface of the spacer 29 by bolting. A cylindrical fitting portion 31 is formed in the blocking member 30, which communicates the lower case 21 in the vertical direction.

[0021] The upper case 22 is a member having a lower specific gravity than the lower case 21, and lower rigidity and strength than the lower case 21. As shown in FIG. 2, the upper case 22 is configured to include a metal base member 32 and a reinforcing layer 33 that is in close contact with the entire outer surface of the base member 32. The reinforcing layer 33 is configured by attaching a plurality of elongated reinforcing sheets made of carbon fiber reinforced plastic (CFRP) to the outer surface of the base member 32 in a layered manner. The specific strength (a value obtained by dividing the tensile strength by the density) of the reinforcing layer 33 made of CFRP is greater than that of the metal base member 32. The base member 32 is thinner than the lower case 21, but is reinforced by the reinforcing layer 33. An upper flange portion 34 is formed at the edge of the opening on the upper surface of the upper case 22. The upper flange portion 34 is a portion that is integrally formed with the base member 32 and over the entire circumference.

[0022] The procedure for assembling the tank 10 and the outer shell 20 will be described. With the lower case 21 and upper case 22 of the outer shell 20 separated, the tank 10 is housed in the lower case 21. At this time, the legs (not shown) of the tank 10 are placed on the lower case 21, so that the tank 10 is supported without contacting the lower case 21. Next, the upper flange portion 34 of the upper case 22 is overlapped and joined onto the lower flange portion 25 of the lower case 21, thereby combining the lower case 21 and the upper case 22. The upper case 22 covers the tank 10 without contacting it.

[0023] Next, the fastening bolt 36 is inserted through the upper flange portion 34 and the lower flange portion 25, and screwed into the nut 26 to tighten it. The lower case 21 and the upper case 22 are integrated by tightening the fastening bolt 36 and the nut 26, and the assembly of the outer shell body 20 is completed. With the outer shell body 20 in the assembled state, the packing 27 is sandwiched between the lower case 21 and the upper case 22 in the vertical direction and elastically deforms. The elastic deformation of the packing 27 hermetically seals the joint surface between the lower case 21 and the upper case 22, and an airtight space 35 is formed between the tank 10 and the outer shell body 20. The entire tank 10 is accommodated in the airtight space 35.

[0024] After the outer shell 20 is assembled, the fuel pump 40 is attached. The fuel pump 40 is a device for supplying the high-pressure gas in the tank 10 to the engine (not shown). The fuel pump 40 has an overall cylindrical shape with its axis facing up and down. A flange-shaped mounting portion 41 is formed on the outer circumferential surface of the fuel pump 40. A connection portion 42 is disposed on the lower end surface of the fuel pump 40 to which a supply pipe (not shown) for supplying the high-pressure gas in the tank 10 to the engine is connected.

[0025] The fuel pump 40 is disposed so as to penetrate the cylindrical fixing member 14, with the flange-shaped mounting portion 41 overlapping the lower surface of the cylindrical fixing member 14. The upper end portion of the fuel pump 40 is accommodated in the tank 10. The fuel pump 40 is fixed to the tank 10 by bolting the flange-shaped mounting portion 41 and the cylindrical fixing member 14 together. A packing (not shown) is provided between the lower surface of the cylindrical fixing member 14 and the upper surface of the flange-shaped mounting portion 41 to airtightly seal the gap between the fuel pump 40 and the cylindrical fixing member 14.

[0026] The lower end of the fuel pump 40 is fitted into the cylindrical fitting portion 31 of the closing member 30. The connection portion 42 is disposed on the outer surface of the outer shell 20. A packing (not shown) for airtight sealing is provided between the lower surface of the spacer 29 and the upper surface of the closing member 30. A packing (not shown) for airtight sealing is provided between the inner peripheral surface of the cylindrical fitting portion 31 and the outer peripheral surface of the fuel pump 40.

[0027] The high-pressure gas storage device A includes a plurality of electric devices 40, 43 to 48, one harness 50, one sealing member 60, and one connector 53. The electric devices provided include a fuel pump 40, a concentration sensor 43, a first pressure sensor 44, a second pressure sensor 45, a first temperature sensor 46, a second temperature sensor 47, and a level sensor 48.

[0028] The concentration sensor 43 detects the presence or absence of vaporized gas in the airtight space 35, and the concentration of the vaporized gas in the airtight space 35. The concentration sensor 43 is disposed at the upper end of the outer shell body 20 (upper case 22). The first pressure sensor 44 detects the pressure in the airtight space 35. The second pressure sensor 45 detects the pressure in the tank 10. The first temperature sensor 46 detects the temperature in the airtight space 35. The second temperature sensor 47 detects the temperature in the tank 10. The level sensor 48 detects the liquid level of the liquefied gas in the tank 10.

[0029] The harness 50 is composed of a plurality of electric wires 51. Each electric wire 51 is connected to the plurality of electric devices 40, 43 to 48 in the airtight space 35, and supplies power to the electric devices and transmits and receives electric signals between the electric devices. The harness 50 is led out from the airtight space 35 to the outside of the outer shell body 20 by penetrating the outer shell body 20 while maintaining airtightness. As a means for airtightly penetrating the harness 50, a through hole 38 is formed in a curved portion constituting the dome-shaped cover portion 24 of the upper case 22 of the outer shell body 20. A seal member 60 is attached to the through hole 38. The through hole 38 is a circular opening that penetrates the outer shell body 20 and communicates the airtight space 35 with the outside of the outer shell body 20.

[0030] The through-holes 38 are disposed in a region excluding the uppermost end and the lowermost end of the total height range of the airtight space 35. Specifically, the height (position) of the through-holes 38 is in a range of 50% or more from the lower end of the airtight space 35 and 80% or less from the lower end of the airtight space 35. More specifically, the height (position) of the through-holes 38 is in a range of 60% or more from the lower end of the airtight space 35 and 70% or less from the lower end of the airtight space 35.

[0031] The seal member 60 is made of an elastic material such as rubber. The seal member 60 is a single component having a main body 61, a retaining portion 63, and a self-sealing portion 66. The main body 61 is cylindrical with an outer diameter equal to the inner diameter of the through hole 38. The main body 61 is concentrically fitted into the through hole 38. The tip of the main body 61 protrudes obliquely upward from the outer surface of the outer shell body 20 to the outside of the outer shell body 20. The base end of the main body 61 protrudes obliquely downward into the airtight space 35. The main body 61 is formed with seal holes 62 in the same number as the number of the electric wires 51. The ends of the seal holes 62 on the outer surface side of the outer shell body 20 open to the tip surface of the main body 61 (seal member 60) and face the external space of the outer shell body 20. Of both ends of the seal hole 62, the end on the inner surface side of the outer shell 20 opens into the base end surface of the main body 61 (seal member 60) and faces the airtight space .

[0032] An electric wire 51 is individually inserted into each seal hole 62. The inner periphery of the seal hole 62 elastically adheres to the outer periphery of the electric wire 51, thereby maintaining the gap between the seal hole 62 and the electric wire 51 in an airtight state. Ends of the multiple electric wires 51 (harness 50) inserted into the seal holes 62 are connected to a connector 53 outside the outer shell 20. The connector 53 is adapted to be connected to a terminal portion of a cable (not shown) connected to functional devices (not shown), such as a power source and a control device.

[0033] The retaining portion 63 is formed so as to protrude like a flange from the outer periphery of the tip of the main body 61 all around. The outer circumferential surface of the retaining portion 63 functions as a tapered guide surface 64 inclined with respect to the axis of the main body 61. The outer diameter dimension of the retaining portion 63 gradually decreases from the base end of the retaining portion 63 toward the tip. The base end surface of the retaining portion 63 functions as an engagement surface 65 that intersects with the axis of the main body 61. The engagement surface 65 is made of a curved surface that follows the outer surface of the outer shell 20, and engages with the outer surface of the outer shell 20 in a face-to-face contact state.

[0034] The self-sealing portion 66 is formed so as to protrude in a flange shape from the base end of the main body portion 61 around the entire circumference. The self-sealing portion 66 is arranged so as to cover the entire circumference of the area of ​​the inner circumferential surface of the outer shell body 20 that surrounds the opening edge of the through-hole 38. The self-sealing portion 66 has a pressure-receiving surface 67 facing the airtight space 35, and a sealing surface 68 facing the inner circumferential surface of the outer shell body 20. The sealing surface 68 is formed with a curved surface that follows the inner surface of the outer shell body 20. A ring-shaped lip portion 69 is formed on the sealing surface 68.

[0035] When the seal member 60 is attached to the outer shell body 20, the electric wire 51 leading out from the electric device 40, 43 to 48 is inserted into the seal hole 62. That is, the harness 50 is inserted into the seal member 60. Then, the connector 53 is connected to the end of the electric wire 51. Next, the seal member 60 is fitted into the through hole 38 from the inside (airtight space 35 side) of the outer shell body 20. At this time, the guide surface 64 slides against the opening edge of the through hole 38, so that the retaining portion 63 is elastically deformed so as to reduce in diameter. When the entire retaining portion 63 passes through the through hole 38 and comes out of the outer shell body 20, the retaining portion 63 returns to its original state so as to increase in diameter, and the locking surface 65 abuts against the outer surface of the outer shell body 20. At the same time, the lip portion 69 of the self-sealing portion 66 abuts against the inner surface of the outer shell body 20. The locking surface 65 of the retaining portion 63 abuts against the outer surface of the outer shell 20 and the lip portion 69 abuts against the inner surface of the outer shell 20, so that the seal member 60 is attached in a state in which its movement relative to the outer shell 20 is restricted.

[0036] Next, the operation of the high-pressure gas storage device A of the present embodiment 1 will be described. The tank 10 that stores high-pressure gas is entirely surrounded by an airtight shell 20, and an airtight space 35 is secured between the tank 10 and the shell 20 to temporarily store high-pressure gas that leaks from the tank 10. Even if the high-pressure gas in the tank 10 leaks out of the tank 10, the leaked high-pressure gas remains in the airtight space 35. Therefore, there is no risk that the high-pressure gas leaking from the tank 10 will enter the cabin of the vehicle or spread to the surroundings of the vehicle.

[0037] When the vaporized gas (ammonia) in the tank 10 leaks into the airtight space 35, the vaporized gas is detected by the concentration sensor 43, and the pressure rise in the airtight space 35 due to the leakage of the vaporized gas is detected by the first pressure sensor 44. Since the specific gravity of the ammonia leaking in a gaseous state is smaller than that of the air originally present in the airtight space 35, the leaked ammonia gas accumulates at the upper end of the airtight space 35. Since the concentration sensor 43 is disposed at the upper end of the airtight space 35, the leakage can be reliably detected even if the amount of ammonia gas leaking is small. When the concentration sensor 43 or the first pressure sensor 44 detects the occurrence of an abnormality, a warning lamp is displayed on the instrument panel of the vehicle, or an alarm sound is generated in the cabin of the vehicle, for example.

[0038] When the pressure in the airtight space 35 increases, the pressure acting on the pressure-receiving surface 67 of the self-sealing portion 66 causes the lip portion 69 to hermetically seal against the inner surface of the outer shell body 20. This annular region that hermetically seals is a region that entirely surrounds the opening edge of the through hole 38 on the inner surface of the outer shell body 20. Therefore, even if the pressure in the airtight space 35 increases, there is no risk of the vaporized gas in the airtight space 35 passing through the through hole 38 and leaking out of the outer shell body 20.

[0039] Here, the through hole 38 and the seal member 60 attached to the through hole 38 are disposed at a height of 60% or more and 70% or less from the lower end of the airtight space 35 of the total height range of the airtight space 35. Since the gaseous ammonia accumulates at the upper end of the airtight space 35, there is no risk of the ammonia gas coming into contact with the seal member 60 unless the amount of leakage is large. Furthermore, since the liquid ammonia accumulates at the lower end of the airtight space 35, there is no risk of the ammonia liquid coming into contact with the seal member 60 unless the amount of leakage is large.

[0040] The high-pressure gas storage device A of the first embodiment includes a tank 10 for storing high-pressure gas, and an outer shell body 20 surrounding the tank 10 with an airtight space 35. The outer shell body 20 is formed with a through hole 38 penetrating from the inner surface side to the outer surface side of the outer shell body 20. The tank 10 and the outer shell body 20 are provided with a fuel pump 40 as an electric device. The outer shell body 20 is provided with a concentration sensor 43, a first pressure sensor 44, and a first temperature sensor 46 as electric devices. The tank 10 is provided with a second pressure sensor 45, a second temperature sensor 47, and a level sensor 48 as electric devices. A plurality of electric wires 51 individually connected to the plurality of electric devices 40, 43 to 48 are bundled together to form a harness 50. The harness 50 is arranged in a state where it is inserted through the through hole 38. The outer shell body 20 is provided with an elastic seal member 60. The seal member 60 has an airtight function of restricting the flow of fluid in the gap between the through hole 38 and the harness 50. Since the elastic seal member 60 restricts the flow of fluid in the gap between the through hole 38 and the harness 50, the portion of the outer shell 20 through which the harness 50 passes can be kept airtight.

[0041] The seal member 60 is made of a single elastic part and has a plurality of seal holes 62 through which the plurality of electric wires 51 pass individually and in an airtight manner. Since the plurality of electric wires 51 pass through the seal member 60 one by one in an airtight manner, no structure for sealing the gaps between adjacent electric wires 51 is required.

[0042] The seal member 60 is formed with a pressure-receiving surface 67 facing the airtight space 35, and a seal surface 68 (lip portion 69) that comes into close contact with a region of the inner surface of the outer shell body 20 surrounding the through hole 38 by a pressing force acting on the pressure-receiving surface 67. The pressure-receiving surface 67 and the lip portion 69 of the seal surface 68 can prevent leakage of high-pressure gas from the gap between the seal member 60 and the through hole 38.

[0043] The sealing member 60 is disposed at a position according to the physical properties of the high-pressure gas and the leakage mode of the high-pressure gas from the tank 10 to the airtight space 35. That is, the position of the sealing member 60 is set according to whether the high-pressure gas in the tank 10 leaks into the airtight space 35 in a gaseous state or in a liquid state. In this embodiment 1, the high-pressure gas is ammonia. The ammonia in the tank 10 can leak into the airtight space 35 in both a gaseous state and a liquid state. Ammonia leaking in a gaseous state has a specific gravity smaller than that of air, so it accumulates at the upper end of the airtight space 35. Ammonia leaking in a liquid state has a specific gravity larger than that of air, so it accumulates at the lower part of the airtight space 35. With this in mind, the seal member 60 is disposed within a range of 50% or more from the lower end of the airtight space 35 and 80% or less from the lower end of the airtight space 35 of the total height range of the airtight space 35 (height range from the lower end to the upper end of the airtight space 35). More specifically, the seal member 60 is disposed within a range of 60% or more from the lower end of the airtight space 35 and 70% or less from the lower end of the airtight space 35. With such a disposition, it is possible to effectively prevent ammonia leaking into the airtight space 35 from coming into contact with the seal member 60.

[0044] <Example 2> Next, a second embodiment of the present invention will be described with reference to Fig. 4. In the high-pressure gas storage device B of the second embodiment, the through hole 72 of the outer shell 70 and the seal member 73 have a different configuration from those of the first embodiment. As the other configurations are the same as those of the first embodiment, the same reference numerals are used for the same configurations, and the description of the structure, action and effect will be omitted.

[0045] The outer shell 70 of this embodiment 2 is formed with a cylindrical portion 71 that protrudes obliquely upward from the outer surface of the outer shell 70. The hollow inside of the cylindrical portion 71 functions as a through hole 72. The seal member 73 of this embodiment 2 is configured to include a molded body 74, a seal ring 78, and a female screw member 79.

[0046] The molded body 74 is made of synthetic resin, and is integrated with a plurality of electric wires by molding. The plurality of electric wires are embedded in the molded body 74 in a state of not contacting each other. A flange-shaped retaining portion 75 is formed at the lower end (the end on the airtight space side) of the outer circumferential surface of the molded body 74. A male thread portion 76 is formed at the tip of the outer circumferential surface of the molded body 74. A seal groove 77 is formed in the outer circumferential surface of the molded body 74. A seal ring 78 is attached to the seal groove 77.

[0047] When attaching the seal member 73 to the outer shell body 70, the molded body 74 is fitted into the through hole 72 from the airtight space side, and the retaining portion 75 is brought into contact with the inner surface of the outer shell body 70. Next, outside the outer shell body 70, the female screw member 79 is screwed into the male screw portion 76 and tightened, and pressed against the protruding end of the cylindrical portion 71. The cylindrical portion 71 is sandwiched between the retaining portion 75 and the female screw member 79 in the axial direction of the cylindrical portion 71, thereby fixing the molded body 74 to the outer shell body 70. A seal ring 78 is elastically attached to the inner peripheral surface of the through hole 72 (cylindrical portion 71), thereby regulating the flow of fluid within the through hole 72.

[0048] The seal member 73 is configured to include a molded body 74 and a seal ring 78. The molded body 74 is in close contact with a plurality of electric wires arranged at a distance from one another. The seal ring 78 is in elastic contact with the outer circumferential surface of the molded body 74 and the inner circumferential surface of the through hole 72. Since the molded body 74 is in close contact with a plurality of electric wires arranged at a distance from one another, a structure for closing the gaps between adjacent electric wires is not required.

[0049] <Other Examples> The present invention is not limited to the embodiments described above and illustrated in the drawings, and the following embodiments are also included within the technical scope of the present invention. The present invention can also be applied when the liquefied gas stored in the tank is liquefied petroleum gas (LPG) used as a gas fuel for engines, liquid hydrogen used as a gas fuel for fuel cells, or an energy carrier that is a storage means for a gas (e.g., hydrogen) that serves as a gas fuel. In the first and second embodiments, the liquefied gas and the vaporized gas are stored in the tank, but the tank may store only the high-pressure vaporized gas. This high-pressure vaporized gas is not a gas generated by the evaporation of the liquefied gas, but a gas that maintains its gas phase, the same as under atmospheric pressure, during the pressurization process. A specific example of a high-pressure vaporized gas that maintains its gas phase is compressed natural gas (CNG). In the first and second embodiments, an airtight space is provided between the entire shell body and the outer surface of the tank, but the shell body may be partially in contact with the outer surface of the tank, and the airtight space may be exposed to only a part of the inner surface of the shell body and only a part of the outer surface of the tank. In the first and second embodiments, the outer shell surrounds the entire tank, but the outer shell may surround only a portion of the tank. In the first and second embodiments, the through hole and the seal member may be set at a height that is less than 60% of the total height range of the airtight space from the lower end, or at a height that is more than 70% of the total height range of the airtight space from the lower end. [Explanation of symbols]

[0050] A, B: High pressure gas storage device 10. Tank 20…External shell 35...Airtight space 38...Through hole 40…Fuel tank (electrical equipment) 43...Concentration sensor (electrical equipment) 44...First pressure sensor (electrical device) 45...Second pressure sensor (electrical device) 46...First temperature sensor (electrical equipment) 47...Second temperature sensor (electrical equipment) 48...Level sensor (electrical equipment) 50…Harness 51...Electric wire 60...Sealing material 62…Seal hole 67…Pressure surface 68…Sealing surface 70…External shell 72...Through hole 73...Sealing material 74...Molded body 78…Seal ring

Claims

1. A tank for storing high-pressure gas; an outer shell surrounding the tank with an airtight space; A through hole formed in the outer shell and penetrating from the inner surface side to the outer surface side of the outer shell; A plurality of electrical devices provided in the tank or the outer shell; a harness configured by bundling a plurality of electric wires individually connected to the plurality of electric devices and arranged in a state of being inserted through the through hole; A high-pressure gas storage device comprising a sealing member having elasticity and regulating the flow of fluid in the gap between the through hole and the harness.

2. 2. The high-pressure gas storage device according to claim 1, wherein the seal member is made of a single elastic part and has a plurality of seal holes through which the plurality of electric wires pass individually and in an airtight manner.

3. A high-pressure gas storage device as described in claim 2, wherein the sealing member has a pressure-receiving surface facing the airtight space and a sealing surface that adheres to an area of ​​the inner surface of the outer shell surrounding the through hole by a pressing force acting on the pressure-receiving surface.

4. The sealing member is a molded body in close contact with the plurality of electric wires arranged apart from one another; 2. The high-pressure gas storage device according to claim 1, further comprising a seal ring elastically in close contact with an outer circumferential surface of the molded body and an inner circumferential surface of the through hole.

5. 5. A high-pressure gas storage device as described in any one of claims 1 to 4, wherein the sealing member is arranged at a position according to the physical properties of the high-pressure gas and the leakage mode of the high-pressure gas from within the tank to the airtight space.

6. the propellant is ammonia, 6. The high-pressure gas storage device according to claim 5, wherein the sealing member is disposed within a range of 50% to 80% of the total height range of the airtight space from a lower end of the airtight space.

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