Overflow prevention valve device and valve assembly

Abstract

The overflow prevention valve (18) is arranged in a valve body accommodating part (53) of a gas flow path and is provided with a valve seat (41) with a valve port (57), a valve body (42) configured to be slidably accommodated in the valve body accommodating part (53), and a biasing member (43) configured to bias the valve body (42) in a direction in which the valve body (42) is separated from the valve seat (41). The valve body (42) has: a valve part (61) configured so as to close the valve port (57) by being seated on the valve seat (41); a receiving part (64) configured so as to support the biasing member (43); and at least one valve body flow path (65) penetrating the valve body (42) in the sliding direction of the valve body (42). The valve body flow path (65) is disposed between the valve part (61) and the receiving part (64) in an orthogonal direction orthogonal to the sliding direction.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to an overcurrent prevention valve device and a valve assembly. BACKGROUND

[0002] For example, Patent Literature 1 discloses a valve assembly for controlling the flow of a gas. Such a valve assembly is installed in a gas tank of a fuel cell vehicle, for example, to control the flow of hydrogen.

[0003] The valve assembly of Patent Literature 1 is provided with a body having a gas flow path, and a plurality of valve subassemblies installed in the body. The valve subassemblies include an overcurrent prevention valve that restricts the flow of hydrogen so that the flow rate of the gas when hydrogen is delivered does not exceed a predetermined amount set in advance.

[0004] Such an overcurrent prevention valve is provided with a valve seat provided in the middle of the gas flow path, a valve core that is slidably housed in the gas flow path, and a spring that applies a force to the valve core in a direction in which the valve core is separated from the valve seat. When hydrogen is delivered, the valve core slides within the gas flow path in response to a force corresponding to a pressure difference between an upstream side pressure and a downstream side pressure of the valve core, and the force applied by the spring. If the piping connected to the overcurrent prevention valve is not abnormal, and the pressure difference is within a normal range, the force applied by the spring is set to be greater than the force corresponding to the pressure difference. Therefore, if no abnormality occurs, the overcurrent prevention valve becomes an open state because the valve core is separated from the valve seat. On the other hand, for example, when the piping is damaged to cause the pressure difference to be excessively large, the force corresponding to the pressure difference can be greater than the force applied by the spring. As a result, the overcurrent prevention valve becomes a closed state because the valve core is seated on the valve seat. Thus, it is possible to prevent the flow rate of hydrogen from exceeding the predetermined amount. PRIOR ART DOCUMENTS PATENT LITERATURE

[0005] Patent Literature 1: Japanese Patent Application Laid-Open No. 2015-523509 SUMMARY PROBLEMS TO BE SOLVED BY THE INVENTION

[0006] It is desirable to further improve the reliability related to the operation of the overcurrent prevention valve described above. MEANS FOR SOLVING THE PROBLEMS

[0007] The overcurrent prevention valve device according to one embodiment of the present disclosure includes a flow path forming member having a gas flow path, and an overcurrent prevention valve configured to restrict the flow of gas when the flow rate of gas flowing in a predetermined direction in the gas flow path exceeds a predetermined amount. The gas flow path has a valve core housing portion that houses at least a portion of the overcurrent prevention valve. The overcurrent prevention valve includes a valve seat provided in the valve core housing portion and having a valve port, a valve core configured to be slidably housed in the valve core housing portion, and an urging member configured to apply a force to the valve core in a direction that separates the valve core from the valve seat. The valve core has a valve portion configured to block the valve port by seating on the valve seat, a receiving portion configured to support the urging member, and at least one valve core flow path that penetrates the valve core in a sliding direction of the valve core. The valve core flow path is disposed between the valve portion and the receiving portion in a direction orthogonal to the sliding direction.

[0008] The valve assembly according to another embodiment of the present disclosure includes a body having a gas flow path including a first flow path and a second flow path, and an overcurrent prevention valve configured to restrict the flow of gas when the flow rate of gas flowing in a predetermined direction in the second flow path exceeds a predetermined amount. The first flow path is configured to be connected to a gas tank that stores gas, and the second flow path is configured to be selectively connected to any one of a plurality of external devices. The plurality of external devices include a supply source of gas that fills the gas tank, and a consumption device that consumes gas sent from the gas tank. The second flow path has a valve core housing portion that houses at least a portion of the overcurrent prevention valve. The predetermined direction is a direction in which gas is sent to the consumption device. The overcurrent prevention valve includes a valve seat provided in the valve core housing portion and having a valve port, a valve core configured to be slidably housed in the valve core housing portion, and an urging member configured to apply a force to the valve core in a direction that separates the valve core from the valve seat. The valve core has a valve portion configured to block the valve port by seating on the valve seat, a receiving portion configured to support the urging member, and at least one valve core flow path that penetrates the valve core in a sliding direction of the valve core. The valve core flow path is disposed between the valve portion and the receiving portion in a direction orthogonal to the sliding direction. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 is a cross-sectional view showing the schematic structure of the valve assembly of one embodiment. Figure 2 is Figure 1 is an enlarged cross-sectional view of the vicinity of the overcurrent prevention valve in the valve assembly of Figure 3 is a perspective view of the valve core of the overcurrent prevention valve of Figure 2 is a perspective view of the valve core of the overcurrent prevention valve of Figure 4 is a perspective view of the spool of the overcurrent prevention valve viewed from the second side of the joint flow path Figure 2 Figure 5 is a schematic view showing the flow of hydrogen passing through the overcurrent prevention valve when filling with hydrogen. Figure 2 Figure 6 is a schematic view showing the flow of hydrogen passing through the overcurrent prevention valve when discharging hydrogen. Figure 2 Figure 7 is a schematic view showing the flow of hydrogen passing through the overcurrent prevention valve when an abnormality has occurred in the piping. Figure 2 DETAILED DESCRIPTION

[0010] Hereinafter, an embodiment of an overcurrent prevention valve device and a valve assembly will be described with reference to the drawings. The "annular shape" in the present specification includes a shape in which a plurality of components or portions are combined to form an annular shape, a shape in which a part has a notch like a C shape, and the like, as long as the entire shape can be regarded as an annular shape. The "annular shape" includes a circular shape, an elliptical shape, and a polygonal shape with acute angles or rounded corners, as viewed in the axial direction, but is not limited to these shapes. The "cylindrical shape" in the present specification includes a shape in which a plurality of components or portions are combined to form a cylindrical shape, a shape in which a part has a notch like a C shape, and the like, as long as the entire shape can be regarded as a cylindrical shape. The "cylindrical shape" includes a circular shape, an elliptical shape, and a polygonal shape with acute angles or rounded corners, as viewed in the axial direction, but is not limited to these shapes.

[0011] (Overall Structure) Figure 1 The valve assembly 1 shown in FIG. 1 is mounted to a gas tank 2 of a fuel cell vehicle, for example. The gas tank 2 stores hydrogen gas at a high pressure of about 72.5 MPa, for example. In addition, the valve assembly 1 is selectively connected to any one of a plurality of external devices 3. The plurality of external devices 3 include a supply source 4 of hydrogen gas to be filled into the gas tank 2, and a consumption device 5 that consumes hydrogen gas discharged from the gas tank 2. The supply source 4 is a hydrogen station, for example, and is connected to the valve assembly 1 via piping 6. The consumption device 5 is a fuel cell mounted to a vehicle, for example, and is connected to the valve assembly 1 via piping 7. The valve assembly 1 controls the flow of hydrogen gas to be filled into the gas tank 2 and hydrogen gas to be discharged from the gas tank 2.

[0012] ​​​​The valve assembly 1 has a body 11 having a gas flow path, and a plurality of valve subassemblies assembled to the body 11. The gas flow path includes a first flow path 12 connected to a gas tank 2, and a second flow path 13 connected to an external device 3. The plurality of valve subassemblies include, for example, a manual valve 14, a composite valve 15, a safety valve 16, a check valve 17, and an overcurrent prevention valve 18. The plurality of valve subassemblies can also include any valve subassembly in addition to or instead of these valve subassemblies.

[0013] (body) The body 11 has a main body 21 and a joint 22. The main body 21 is made of, for example, a metal material. The main body 21 has, for example, a rectangular parallelepiped shape with a portion protruding therefrom. The outer surface of the main body 21 includes a first side surface 21a, a second side surface 21b, a third side surface 21c, and a fourth side surface 21d. The first side surface 21a and the third side surface 21c are, for example, parallel to each other. The second side surface 21b and the fourth side surface 21d are, for example, parallel to each other. The first side surface 21a and the third side surface 21c are, for example, orthogonal to the second side surface 21b and the fourth side surface 21d.

[0014] The main body 21 has a plurality of mounting holes corresponding to components mounted to the main body 21. The plurality of mounting holes include, for example, a joint mounting hole 24 for mounting the joint 22, a manual valve mounting hole 25 for mounting the manual valve 14, a comprehensive mounting hole 26 for mounting the safety valve 16 and the check valve 17, and a composite valve mounting hole 27 for mounting the composite valve 15. The joint mounting hole 24 is, for example, a circular hole that is open at the first side surface 21a. The manual valve mounting hole 25 is, for example, a circular hole that is open at the second side surface 21b. The comprehensive mounting hole 26 is, for example, a circular hole that is open at the third side surface 21c. The composite valve mounting hole 27 is, for example, a circular hole that is open at the fourth side surface 21d.

[0015] The first flow path 12 includes a filling portion 31 that communicates the comprehensive mounting hole 26 with the gas tank 2, and a delivery portion 32 that communicates the composite valve mounting hole 27 with the gas tank 2. The filling portion 31 is, for example, open at the inner peripheral surface of the comprehensive mounting hole 26. Thus, the safety valve 16 and the check valve 17 are connected to the gas tank 2 via the filling portion 31. The delivery portion 32 is, for example, open at the inner peripheral surface of the composite valve mounting hole 27. Thus, the composite valve 15 is connected to the gas tank 2 via the delivery portion 32. As shown, the filling portion 31 and the delivery portion 32 can be independent flow paths from each other.

[0016] The second flow path 13 includes a first portion 33, a second portion 34, a third portion 35, a fourth portion 36, and a joint flow path 37. The first portion 33, the second portion 34, the third portion 35, and the fourth portion 36 are provided to the main body 21. The joint flow path 37 is provided to the joint 22 as described later.

[0017] The first portion 33 opens at the bottom surface of the joint-use mounting hole 24. The second portion 34 opens at the bottom surface of the manual valve-use mounting hole 25. The first portion 33 and the second portion 34 extend, for example, in a straight line. The second portion 34 is orthogonal to the first portion 33. The inner diameter of the portion of the second portion 34 on the inner side of the intersecting position with the first portion 33 is smaller than the inner diameter of the portion on the proximal side of the intersecting position. The third portion 35 opens, for example, at the bottom surface of the comprehensive mounting hole 26. The third portion 35 communicates the second portion 34 with the comprehensive mounting hole 26. The fourth portion 36 opens, for example, at the bottom surface of the compound valve-use mounting hole 27. The fourth portion 36 communicates the second portion 34 with the compound valve-use mounting hole 27. The third portion 35 and the fourth portion 36 extend, for example, in a straight line.

[0018] As shown in the drawing, the third portion 35 is orthogonal, for example, to the small-diameter portion of the second portion 34. The fourth portion 36 is coaxial, for example, with the second portion 34. Further, the structure of the second flow path 13 is not limited to the example shown in the drawing, and can be appropriately changed. For example, the third portion 35 can be disposed coaxially with the first portion 33 and orthogonal to the large-diameter portion of the second portion 34. In addition, the fourth portion 36 can be orthogonal, for example, to the second portion 34.

[0019] The joint 22 is made of a metal material, for example. The joint 22 is in a cylindrical shape, for example. The joint 22 has a joint flow path 37 as a gas flow path. The joint flow path 37 extends, for example, in a straight line along the axial direction of the joint 22 and opens at both end surfaces of the joint 22. The joint 22 is fixed to the joint-use mounting hole 24 by any fixing method such as screwing or press-fitting. Thus, the joint flow path 37 communicates with the first portion 33. Either one of the pipes 6 and 7 is connected to the joint 22. Thus, the supply source 4 or the consumption device 5 is connected to the second flow path 13 via the joint flow path 37. A flow-preventing valve 18 is provided in the joint flow path 37. That is, the joint 22 corresponds to a flow path forming member, and the assembly of the joint 22 and the flow-preventing valve 18 corresponds to a flow-preventing valve device. Thus, the valve assembly 1 includes a flow-preventing valve device.

[0020] (Valve Subassembly) The manual valve 14 is fixed to the manual valve-use mounting hole 25 by any fixing method such as screwing or press-fitting. The manual valve 14 is configured to be able to block the second portion 34 of the second flow path 13 by the user's operation.

[0021] The safety valve 16 is configured to become a closed state when the temperature of the safety valve 16 is below a threshold temperature. The safety valve 16 does not release the hydrogen gas in the gas tank 2 to the outside in the closed state. On the other hand, the safety valve 16 is configured to become an open state from the closed state irreversibly when the temperature of the safety valve 16 exceeds the threshold temperature. The safety valve 16 releases the hydrogen gas in the gas tank 2 to the outside in the open state. The threshold temperature is set in advance so that the pressure of the hydrogen gas in the gas tank 2 does not become excessively large to damage the gas tank 2.

[0022] The check valve 17 is configured to prevent backflow of the hydrogen gas filled into the gas tank 2. Specifically, the check valve 17 restricts the flow of the hydrogen gas from the filling portion 31 of the first flow path 12 to the third portion 35 of the second flow path 13, and allows the flow of the hydrogen gas from the third portion 35 to the filling portion 31.

[0023] The composite valve 15 has an electromagnetic valve portion functioning as an electromagnetic valve, and a check valve portion functioning as a check valve. The composite valve 15 controls the flow of the hydrogen gas between the delivery portion 32 of the first flow path 12 and the fourth portion 36 of the second flow path 13 by opening and closing the electromagnetic valve portion. The check valve portion allows the flow of the hydrogen gas from the delivery portion 32 to the fourth portion 36, and restricts the flow of the hydrogen gas from the fourth portion 36 to the delivery portion 32. Thus, when the hydrogen gas is filled from the supply source 4 to the gas tank 2, the hydrogen gas at a high pressure is suppressed from acting on the electromagnetic valve portion.

[0024] The flow-preventing valve 18 is configured to restrict the flow of the hydrogen gas when the flow rate of the hydrogen gas flowing in a predetermined direction in the joint flow path 37 (the second flow path 13) exceeds a predetermined amount set in advance. The predetermined direction is, for example, a direction in which the hydrogen gas is delivered from the gas tank 2 to the consumer 5. The flow-preventing valve 18 does not restrict the flow rate of the hydrogen gas in a direction opposite to the predetermined direction, that is, a direction in which the hydrogen gas is filled from the supply source 4 to the gas tank 2. Details of the flow-preventing valve 18 will be described later.

[0025] (Action of the valve assembly) When the hydrogen gas is filled to the gas tank 2, the supply source 4 is connected to the joint 22 via the pipe 6. When the hydrogen gas is supplied from the supply source 4, the hydrogen gas flows into the check valve 17 via the joint flow path 37, the first portion 33, the second portion 34, and the third portion 35 of the second flow path 13. As described above, the check valve 17 becomes the open state because it is configured to allow the flow of the hydrogen gas from the third portion 35 to the filling portion 31. Thus, the hydrogen gas is filled to the gas tank 2 via the filling portion 31. At this time, the hydrogen gas also flows into the check valve portion of the composite valve 15 from the second portion 34 of the second flow path 13 via the fourth portion 36. However, the check valve portion becomes the closed state because it is configured to restrict the flow of the hydrogen gas from the fourth portion 36 to the delivery portion 32. Thus, the hydrogen gas does not flow from the second flow path 13 to the delivery portion 32.

[0026] When hydrogen is supplied to the consumption device 5, the consumption device 5 is connected to the connector 22 via piping 7. Hydrogen in the gas tank 2 flows into the compound valve 15 via the outlet portion 32 of the first flow path 12. When the solenoid valve portion of the compound valve 15 is controlled to be open, hydrogen flows into the check valve portion. The check valve portion is configured to allow hydrogen to flow from the outlet portion 32 to the fourth portion 36, and is therefore open. Thus, hydrogen flows into the fourth portion 36, the second portion 34, the first portion 33, and the connector flow path 37 of the second flow path 13, and is supplied to the consumption device 5 via piping 7. At this time, hydrogen also flows from the second portion 34 of the second flow path 13 through the third portion 35 into the check valve 17. However, the check valve 17 is closed due to the pressure of the hydrogen stored in the gas tank 2. Therefore, hydrogen does not flow from the third portion 35 into the filling portion 31.

[0027] Thus, the second flow path 13 is used as both a hydrogen filling path and a hydrogen supply path. In other words, a portion of the hydrogen filling path and a portion of the hydrogen supply path are shared.

[0028] (Overflow prevention valve device) like Figure 2 As shown, an overflow prevention valve 18 is provided in the connector flow path 37 of connector 22. The overflow prevention valve 18 includes: a valve seat 41 located in the middle of the connector flow path 37, a valve core 42 slidably housed in the connector flow path 37, and a coil spring 43 serving as a force-applying component that applies force to the valve core 42 in a direction that causes it to move away from the valve seat 41. As shown, the overflow prevention valve 18 may also include a stop 44 that defines the range of movement of the valve core 42. Furthermore, regardless of the presence or absence of the stop 44, the overflow prevention valve 18 may also include a filter 45 and a pressing component 46. Moreover, regardless of the presence or absence of the stop 44, the filter 45, and the pressing component 46, the overflow prevention valve 18 may also include a sealing component 47. In the following description, the side of the connector flow path 37 connected to the first part 33 of the second flow path 13 is referred to as the first side, and the opposite side, i.e., the side of the connector flow path 37 connected to the piping 7, is referred to as the second side.

[0029] For example, as shown in the drawing, the joint flow path 37 is linear along the axial direction of the joint 22. A cross section of the joint flow path 37 orthogonal to the extending direction has a circular shape. The joint flow path 37 of the present embodiment has a stepped shape in which the inner diameter decreases in steps from the first side to the second side. Specifically, the joint flow path 37 has, in order from the first side, a seal member housing portion 51, a filter housing portion 52, a valve core housing portion 53, and a small-diameter flow path portion 54. The inner diameter of the joint flow path 37 decreases in order of the seal member housing portion 51, the filter housing portion 52, the valve core housing portion 53, and the small-diameter flow path portion 54. At the end portion of the inner peripheral surface of the valve core housing portion 53 on the first side, an annular stopper groove 55 extending in the circumferential direction of the valve core housing portion 53 is provided. The inner peripheral edge of a step portion 56 between the valve core housing portion 53 and the small-diameter flow path portion 54 serves as the above-mentioned valve seat 41 on which the valve core 42 is seated. Also, the first side end portion of the small-diameter flow path portion 54 serves as a valve port 57. That is, a portion of the joint 22 that is seamlessly continuous with other portions constitutes the valve seat 41. In other words, the joint 22 is a one piece that has both the joint flow path 37 and the valve seat 41. As shown in the drawing, the inner peripheral edge of the valve seat 41 can also be chamfered in a tapered shape.

[0030] The seal member 47 is made of, for example, a rubber material or a resin material. The seal member 47 is annular. In the present embodiment, the seal member 47 has a circular shape as viewed in the axial direction. The seal member 47 is fitted in the seal member housing portion 51. Also, by mounting the joint 22 to the joint mounting hole 24, the seal member 47 is brought into close contact with the bottom surface of the joint mounting hole 24. Thus, the main body 21 and the joint 22 are sealed from each other.

[0031] The filter 45 is made of, for example, a metal mesh or the like. The filter 45 has, for example, a circular shape as viewed in the axial direction. The pressing member 46 is made of, for example, a metal material. The pressing member 46 is annular. In the present embodiment, the pressing member 46 has a circular shape as viewed in the axial direction. The filter 45 is disposed in the filter housing portion 52. Also, the filter 45 is pressed from the first side by the pressing member 46 fitted in the filter housing portion 52, and thus is fixed in the filter housing portion 52.

[0032] The stopper 44 is made of, for example, a metal material. The stopper 44 is annular. In the present embodiment, the stopper 44 has a C-shaped form as viewed in the axial direction. The stopper 44 is, for example, a snap ring. The stopper 44 is fixed in the valve core housing portion 53 by being stopped in the stopper groove 55 of the valve core housing portion 53.

[0033] The coil spring 43 is compressed between the valve core 42 and the outer peripheral edge of the step portion 56. Thus, the coil spring 43 always exerts a force on the valve core 42 in the direction of the first side of the joint flow path 37, that is, in the direction away from the valve seat 41.

[0034] The valve element 42 is a poppet valve that is substantially cylindrical. The valve element 42 is housed in the valve element housing portion 53 in such a manner that its axial direction extends along the joint flow path 37. Further, the valve element housing portion 53 is sometimes referred to as a valve chamber. The valve element 42 is made of, for example, a metal material.

[0035] The valve element 42 is subjected to a force (hereinafter referred to as a differential pressure application force) corresponding to the pressure difference between the upstream side pressure and the downstream side pressure. Therefore, the valve element 42 slides within the joint flow path 37 in response to the differential pressure application force and the mechanical application force of the coil spring 43. The sliding direction of the valve element 42 coincides with the axial direction of the joint 22, that is, the extending direction of the joint flow path 37. In the present embodiment, the sliding direction of the valve element 42 also coincides with the axial direction of the valve element 42.

[0036] In the overcurrent prevention valve 18 thus configured, when the gas tank 2 is filled with hydrogen gas, the first side of the joint flow path 37 is the downstream side, and the second side of the joint flow path 37 is the upstream side. Therefore, the valve element 42 is applied with both the differential pressure application force and the mechanical application force in the direction away from the valve seat 41. Thus, the valve element 42 is separated from the valve seat 41, and the overcurrent prevention valve 18 becomes an open state. Further, the valve element 42 is restricted from further separating from the valve seat 41 by abutting against the stopper 44.

[0037] When hydrogen gas is sent to the consumption device 5, the first side of the joint flow path 37 is the upstream side, and the second side of the joint flow path 37 is the downstream side. For example, if the piping 7 connected to the overcurrent prevention valve 18 is not abnormal, and the pressure difference is within a predetermined range, the mechanical application force of the coil spring 43 is set to be greater than the differential pressure application force corresponding to the pressure difference. Therefore, the valve element 42 is separated from the valve seat 41, and the overcurrent prevention valve 18 becomes an open state. That is, the overcurrent prevention valve 18 is a so-called normally open type valve.

[0038] On the contrary, for example, when the downstream side pressure sharply decreases due to damage of the piping 7, and the pressure difference is excessively large, the differential pressure application force corresponding to the pressure difference can be greater than the mechanical application force. As a result, the valve element 42 slides toward the second side of the joint flow path 37 and is seated on the valve seat 41, and the overcurrent prevention valve 18 becomes a closed state.

[0039] Here, the inventors of this invention, through in-depth research, discovered that the flow of hydrogen gas can affect the spring characteristics of the helical spring 43. Specifically, consider the following scenario: a large amount of hydrogen gas passes radially through the helical spring 43 from its inner circumference to its outer circumference, or from its outer circumference to its inner circumference. In this case, the helical spring 43 may undergo plastic deformation due to the pressure of the radially passing hydrogen gas. Furthermore, once the spring characteristics of the helical spring 43 change due to plastic deformation, for example, even if the aforementioned pressure difference is within a predetermined range, the mechanical force applied by the helical spring 43 may sometimes be less than the differential pressure applied force corresponding to that pressure difference. Moreover, once the spring characteristics of the helical spring 43 change due to plastic deformation, for example, even if the aforementioned pressure difference is outside a predetermined range, the mechanical force applied by the helical spring 43 may sometimes be greater than the differential pressure applied force corresponding to that pressure difference. As a result, the valve core 42 may not be able to slide properly according to the pressure difference. In particular, when rapidly filling the gas tank 2 with hydrogen, the hydrogen flow rate increases, thus the helical spring 43 is prone to plastic deformation. Based on this, the valve core 42 has a shape that makes it difficult for hydrogen to pass through the helical spring 43 radially.

[0040] Specifically, such as Figure 2 , Figure 3 and Figure 4 As shown, the valve core 42 has: a valve portion 61, a base portion 62 continuously disposed relative to the valve portion 61 toward a first side of the connector flow path 37, and a cylindrical portion 63 continuously disposed relative to the base portion 62 toward a first side of the connector flow path 37.

[0041] The valve section 61 is tapered, with its outer diameter decreasing towards the second side of the connector flow path 37. The smallest outer diameter of the valve section 61 is smaller than the inner diameter of the small-diameter flow path section 54, i.e., the inner diameter of the valve port 57. The largest outer diameter of the valve section 61 is larger than the inner diameter of the small-diameter flow path section 54, i.e., the inner diameter of the valve port 57. As a result, the valve section 61 blocks the valve port 57 by sitting on the valve seat 41. Furthermore, when the valve section 61 is seated on the valve seat 41, the front end of the valve section 61 is inserted into the valve port 57.

[0042] The base 62 is generally cylindrical. The base 62 is coaxially disposed with the valve portion 61. The outer diameter of the base 62 is larger than the maximum outer diameter of the valve portion 61 and slightly smaller than the inner diameter of the valve core receiving portion 53. Thus, the outer peripheral surface of the base 62 and the inner peripheral surface of the valve core receiving portion 53 are slidably in contact over their entire circumference.

[0043] The base 62 has a support portion 64 for supporting the helical spring 43. In this embodiment, the support portion 64 is groove-shaped, opening towards the second side of the connector flow path 37 and radially outward. The end of the helical spring 43 is mounted on the support portion 64.

[0044] The base 62 has at least one valve core flow path 65 extending through its axial direction. That is, the valve core flow path 65 extends through the sliding direction of the valve core 42. Furthermore, the valve core flow path 65 is disposed radially outside the valve portion 61 and radially inside the bearing portion 64 in the base 62. In other words, the valve core flow path 65 is disposed between the valve portion 61 and the bearing portion 64 in an orthogonal direction orthogonal to the sliding direction. In this embodiment, the base 62 has four valve core flow paths 65. The sum of the flow path cross-sectional areas of the four valve core flow paths 65 is greater than the flow path cross-sectional area of ​​the small-diameter flow path portion 54. Furthermore, the flow path cross-sectional area of ​​each valve core flow path 65 may be greater than or smaller than the flow path cross-sectional area of ​​the small-diameter flow path portion 54. The four valve core flow paths 65 are arranged at equal angular intervals in the circumferential direction of the base 62. The valve core flow paths 65 extend linearly, for example, along the axial direction of the base 62. When viewed axially, the valve core flow path 65 appears, for example, fan-shaped.

[0045] The cylindrical portion 63, viewed axially, has a circular shape. The cylindrical portion 63 is coaxially arranged with the valve portion 61 and the base 62. The outer diameter of the cylindrical portion 63 is approximately equal to the outer diameter of the base 62. Therefore, the outer diameter of the cylindrical portion 63 is slightly smaller than the inner diameter of the valve core receiving portion 53. Consequently, the outer circumferential surface of the cylindrical portion 63 and the inner circumferential surface of the valve core receiving portion 53 are in slidable contact throughout their entire circumference. In other words, a portion of the base 62 and the cylindrical portion 63 in the valve core 42 constitute a sliding contact portion.

[0046] Furthermore, the valve core 42 of this embodiment has a fine hole 66 extending through it in its axial direction. The fine hole 66 extends from the second side end of the valve portion 61 to the first side end of the base 62. Therefore, even when the valve core 42 is seated on the valve seat 41, hydrogen can still be supplied from the connector 22. In other words, the overflow prevention valve 18 is configured to allow hydrogen to flow through it even when it is closed. In addition, the flow path cross-sectional area of ​​the fine hole 66 is smaller than the flow path cross-sectional area of ​​the small-diameter flow path portion 54. Furthermore, the flow path cross-sectional area of ​​the fine hole 66 is smaller than the flow path cross-sectional area of ​​each of the valve core flow paths 65. Therefore, the flow rate of hydrogen when the overflow prevention valve 18 is closed is less than the flow rate of hydrogen when the overflow prevention valve 18 is open.

[0047] (The flow of hydrogen gas) Next, the flow of hydrogen gas through the overflow prevention valve 18 will be explained. like Figure 5 As shown, during hydrogen filling, the overflow prevention valve 18 is in the open state. At this time, the hydrogen supplied from the supply source 4 flows from the second side to the first side in the connector flow path 37. Specifically, as... Figure 5As indicated by the thick arrow, hydrogen gas flows from the small-diameter flow path 54 to the valve core housing 53. Furthermore, after passing the valve core 42, the hydrogen gas passes through the filter 45. When the hydrogen gas passes the valve core 42, since the valve core 42 has a valve core flow path 65, the hydrogen gas mainly passes through the valve core flow path 65. Thus, the flow rate of hydrogen gas passing between the valve core 42 and the valve core housing 53 is reduced compared to the case where the valve core 42 does not have a valve core flow path 65. In addition, a small amount of hydrogen gas passes through the fine orifice 66 when the hydrogen gas passes the valve core 42. Figure 5 For ease of explanation, the flow of hydrogen gas passing between valve core 42 and valve core housing 53, as well as the flow of hydrogen gas through fine holes 66, are not shown.

[0048] like Figure 6 As shown, when hydrogen is being supplied, if no abnormality occurs, the overflow prevention valve 18 is in the open state. At this time, the hydrogen supplied from gas tank 2 flows from the first side to the second side in the connector flow path 37. Specifically, as... Figure 6 As indicated by the thick arrow, hydrogen gas passing through filter 45 flows into the small-diameter flow path 54 after passing valve core 42. When hydrogen gas passes through valve core 42, since valve core 42 has valve core flow path 65, the hydrogen gas mainly passes through valve core flow path 65, similar to when filling with hydrogen. Figure 6 For ease of explanation, the flow of hydrogen gas passing between valve core 42 and valve core housing 53, as well as the flow of hydrogen gas through fine holes 66, are not shown.

[0049] like Figure 7 As shown, when hydrogen is being supplied, for example, if an abnormality occurs in piping 7, the overflow prevention valve 18 will be closed. At this time, as... Figure 7 As indicated by the thick dashed arrow, a small amount of hydrogen gas flows out through the fine orifice 66 into the small-diameter flow path 54. Since the valve core flow path 65 is located on the outer periphery of the valve section 61, hydrogen gas will not flow out through the valve core flow path 65 into the small-diameter flow path 54.

[0050] Next, the function and effects of this implementation method will be explained. (1) During hydrogen filling and normal discharge, hydrogen mainly flows through the valve core flow path 65, thus flowing from the upstream side to the downstream side of the valve core 42. As a result, as described above, the flow rate of hydrogen passing between the valve core 42 and the valve core receiving portion 53 is reduced. Here, the helical spring 43 is supported by the bearing portion 64 located on the outer periphery of the valve core flow path 65 in the valve core 42. Therefore, the flow rate of hydrogen passing between the valve core 42 and the valve core receiving portion 53 is reduced, thereby reducing the flow rate of hydrogen passing radially through the helical spring 43. As a result, the helical spring 43 is less prone to plastic deformation, and changes in the spring characteristics of the helical spring 43 can be suppressed. Therefore, the valve core 42 can slide appropriately in response to changes in the pressure difference between the upstream and downstream sides of the valve core 42, improving the reliability related to the operation of the overflow prevention valve 18.

[0051] (2) The valve core 42 has a base 62 and a cylindrical portion 63 configured to slidably contact the inner circumferential surface of the valve core receiving portion 53 over its entire circumference. As a result, the gap between the valve core 42 and the valve core receiving portion 53 is reduced. Therefore, the flow rate of hydrogen passing between the valve core 42 and the valve core receiving portion 53, i.e., the flow rate of hydrogen passing radially through the helical spring 43, can be further reduced.

[0052] (3) The total cross-sectional area of ​​the flow path 65 of the valve core is greater than the cross-sectional area of ​​the flow path of the valve port 57. Therefore, the flow rate of hydrogen will not be restricted due to the passage of hydrogen in the valve core flow path 65. As a result, hydrogen can be quickly filled into the gas tank 2 and sufficient hydrogen can be delivered to the consumption device 5.

[0053] (4) The overflow prevention valve 18 is configured to allow hydrogen to flow through it when the valve core 42 is seated on the valve seat 41. Therefore, for example, when an abnormality occurs, such as when the piping 7 is damaged and the check valve 17 is locked in the open state, the abnormality is reported by the flow of a small amount of hydrogen, and the rapid flow of hydrogen from the gas tank 2 can be suppressed.

[0054] This embodiment can be modified as follows. This embodiment and the following variations can be combined and implemented to the extent that they do not contradict each other technically. A helical spring 43 is used as the force-applying component, but it is not limited to this. For example, a disc spring or the like can also be used as the force-applying component.

[0055] The overcurrent prevention valve 18 is configured such that the valve core 42 has the fine hole 66, so that hydrogen gas is delivered even when the overcurrent prevention valve 18 is in the closed state. However, the overcurrent prevention valve 18 is not limited to this, and may, for example, be configured such that a groove is formed in at least one of the outer peripheral surface of the valve portion 61 of the valve core 42 and the inner peripheral surface of the valve port 57, so that hydrogen gas is delivered even when the overcurrent prevention valve 18 is in the closed state. Further, the overcurrent prevention valve 18 may, for example, be configured such that hydrogen gas cannot be delivered when the overcurrent prevention valve 18 is in the closed state.

[0056] The sum of the flow path cross-sectional areas of the valve core flow paths 65 may, for example, be smaller than the flow path cross-sectional area of the small-diameter flow path portion 54. The configuration of the valve core flow paths 65 can be appropriately changed as long as the valve core flow paths 65 pass through in the sliding direction of the valve core 42. For example, the valve core flow paths 65 can be straight lines inclined with respect to the axial direction of the valve core 42, or can be curved lines. Further, the valve core flow paths 65 can have a shape other than a sector shape, such as a circular shape, when viewed in the axial direction. The valve core flow paths 65 can not be arranged at equal angular intervals in the peripheral direction of the base portion 62, as long as the valve core flow paths 65 are provided between the valve portion 61 and the receiving portion 64 in the orthogonal direction orthogonal to the sliding direction. Furthermore, the number of valve core flow paths 65 provided in the valve core 42 can be appropriately changed.

[0057] The shape of the receiving portion 64 can be appropriately changed. For example, the receiving portion 64 can be a groove that is not open to the radial direction outside but is open only to the second side of the joint flow path 37. The valve core 42 can not have a sliding contact portion that is in slidable contact with the inner peripheral surface of the valve core housing portion 53 over the entire circumference thereof. For example, the outer peripheral surface of the base portion 62 and the cylindrical portion 63 can be polygonal. In this case, a flow path for hydrogen gas is formed between the outer peripheral surface of the base portion 62 and the cylindrical portion 63 and the inner peripheral surface of the valve core housing portion 53.

[0058] The valve core 42 can not have, for example, the cylindrical portion 63, and the shape thereof can be appropriately changed. Further, the valve core 42 can be, for example, spherical, and the shape of the valve core 42 is not limited to a cylindrical shape.

[0059] In the overcurrent prevention valve 18, the filter 45 can be pressed by the sealing member 47, for example. In this case, the overcurrent prevention valve 18 can not have the pressing member 46 that is a different member from the sealing member 47. Further, the overcurrent prevention valve 18 can not have the filter 45. Furthermore, the overcurrent prevention valve 18 can not have the sealing member 47.

[0060] The joint 22 is a unitary member that has both the joint flow path 37 and the valve seat 41, but is not limited to this, and the valve seat can be fixed in the joint flow path 37 by a member different from the joint 22. The configuration of the joint flow path 37 can be appropriately changed depending on the configuration of the overcurrent prevention valve 18.

[0061] The overcurrent prevention valve 18 can also be assembled in the main body 21 instead of the joint 22. The overcurrent prevention valve device can also be used independently from the valve assembly 1. In this case, the flow path forming member that forms the gas flow path can also be a member other than the joint 22.

[0062] The valve assembly 1 controls the flow of high-pressure hydrogen gas, but is not limited to this, and can also control the flow of gas other than hydrogen gas. Next, the following will be described as an addition to the technical ideas that can be grasped from the above-described embodiments and modified examples.

[0063] (Supplementary Note 1) The biasing member can also be a coil spring. (Supplementary Note 2) The valve core can further have a cylindrical base portion continuous with the valve portion, the valve core flow path can pass through the base portion in the axial direction of the base portion, and the valve core can slide in the valve core housing portion along the axial direction.

[0064] (Supplementary Note 3) The valve portion can be provided at the center of the base portion, and the receiving portion can be provided at the outer periphery of the base portion. (Supplementary Note 4) The valve core can further have a fine hole extending in the axial direction of the base portion and passing through the valve portion and the base portion.

[0065] (Supplementary Note 5) The gas flow path can have a small-diameter flow path portion continuous with the valve core housing portion and having a smaller flow path cross-sectional area than the valve core housing portion, an inner periphery of a step portion between the valve core housing portion and the small-diameter flow path portion can function as the valve seat, and an end portion of the small-diameter flow path portion can function as the valve port.

Claims

1. An overcurrent prevention valve device, comprising: a flow path forming member having a gas flow path; and an overcurrent prevention valve configured to restrict the passage of gas when the flow rate of gas flowing in a predetermined direction in the gas flow path exceeds a predetermined amount, wherein the gas flow path has a valve core housing portion that houses at least a portion of the overcurrent prevention valve, wherein the overcurrent prevention valve comprises: a valve seat provided in the valve core housing portion and having a valve port; a valve core configured to be slidably housed in the valve core housing portion; and a force applying member configured to apply a force to the valve core in a direction in which the valve core is separated from the valve seat, wherein the valve core has: a valve portion configured to block the valve port by seating on the valve seat; a receiving portion configured to support the force applying member; and at least one valve core flow path that passes through the valve core in a sliding direction of the valve core, wherein the valve core flow path is disposed between the valve portion and the receiving portion in a direction orthogonal to the sliding direction.

2. The overcurrent prevention valve device according to claim 1, wherein the valve core further has a sliding contact portion configured to be in slidable contact with an inner peripheral surface of the valve core housing portion over the entire circumference of the inner peripheral surface.

3. The overcurrent prevention valve device according to claim 1 or 2, wherein the sum of the flow path cross-sectional areas of the at least one valve core flow path is greater than the flow path cross-sectional area of the valve port.

4. The overcurrent prevention valve device according to claim 1 or 2, wherein the overcurrent prevention valve is configured to allow the passage of gas therethrough in a state in which the valve core is seated on the valve seat.

5. A valve assembly, comprising: a body having a gas flow path including a first flow path and a second flow path; and an overcurrent prevention valve configured to restrict the passage of gas when the flow rate of gas flowing in a predetermined direction in the second flow path exceeds a predetermined amount, wherein the first flow path is configured to be connected to a gas tank that stores gas, wherein the second flow path is configured to be selectively connected to any one of a plurality of external devices, wherein the plurality of external devices include a supply source that fills the gas tank with gas, and a consumption device that consumes gas sent out from the gas tank, wherein the second flow path has a valve core housing portion that houses at least a portion of the overcurrent prevention valve, wherein the predetermined direction is a direction in which gas is sent out to the consumption device, wherein the overcurrent prevention valve comprises: a valve seat provided in the valve core housing portion and having a valve port; a valve core configured to be slidably housed in the valve core housing portion; and a force applying member configured to apply a force to the valve core in a direction in which the valve core is separated from the valve seat, wherein the valve core has: a valve portion configured to block the valve port by seating on the valve seat; a receiving portion configured to support the force applying member; and at least one valve core flow path that passes through the valve core in a sliding direction of the valve core, wherein the valve core flow path is disposed between the valve portion and the receiving portion in a direction orthogonal to the sliding direction. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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