Pressure Regulating Valve

Abstract

To provide a technique for suppressing self-exciting vibration of a valve element.SOLUTION: A pressure regulating valve includes a valve element 110, a valve seat which the valve element contacts, and an elastic member 120 for pushing the valve element against the valve seat, the valve element having a hollow part 111 storing at least part of the elastic member, and closed at its valve seat side and opened to the opposite side to the valve seat, and a through-hole 112 opened to each of a part of the outside of the valve element, not contacting the valve seat, and the hollow part. The center axis of the through-hole intersects with a center axis of the valve element.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a pressure regulating valve. [Background technology]

[0002] A known pressure regulating valve opens and closes the valve by contacting or separating the valve body from the valve seat, thereby reducing pressure. In a pressure regulating valve, the valve body has a recess that opens on the opposite side to the valve seat, and an elastic member that presses the valve body against the valve seat is accommodated in the recess. Patent Document 1 describes a technology in which a support member that defines the retreated position of the valve body, which is the opposite side to the valve seat, is provided with a plurality of through holes. When the support member is viewed along the central axis of the recess from the opposite side to the valve seat, the center of the through hole is not included in the open part of the valve body. Therefore, it is possible to suppress the valve body from being pressed against the valve seat more than necessary by the fluid that has flowed into the inside of the recess of the valve body, and the application of an excessive load to the valve seat. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-39512 A Summary of the Invention [Problem to be solved by the invention]

[0004] Even in a pressure regulating valve in which the center of the through hole is not included in the open portion of the valve body when the support member is viewed from the opposite side to the valve seat along the central axis of the recess, if the pressure of the fluid flowing from the through hole of the support member toward the valve body is high, the following problem may occur. That is, the fluid that flows into the recess of the valve body bounces off the bottom of the recess, generating a pressure wave in the upstream direction, and the fluid repeatedly flows out and in from the opening of the valve body to the outside, which may cause self-excited vibration in the valve body. In this case, the valve body may move violently up and down, causing the tip of the valve body to deform. For this reason, a technology that can suppress self-excited vibration in the valve body has been desired. [Means for solving the problem]

[0005] The present disclosure has been made to solve the above-mentioned problems, and can be realized in the following forms. According to one aspect of the present disclosure, there is provided a pressure regulating valve comprising a valve body, a valve seat with which the valve body contacts, into which a fluid flows from a side contacting the valve body, and an elastic member that presses the valve body against the valve seat. The valve body includes a hollow portion that houses at least a portion of the elastic member and opens to a side opposite the valve seat, a through hole that penetrates a portion of the outside of the valve body that does not contact the valve seat and the hollow portion, and A column portion and a cone portion having a substantially conical shape provided closer to the valve seat than the column portion; Have The hollow portion is formed within the column portion, and the through hole has a penetrating portion that penetrates the conical portion in a direction intersecting with a central axis of the valve body, and a communicating portion that communicates between the penetrating portion and the hollow portion. do.

[0006] According to one aspect of the present disclosure, there is provided a pressure regulating valve comprising a valve body, a valve seat with which the valve body contacts, and an elastic member that presses the valve body against the valve seat. The valve body houses at least a portion of the elastic member, is closed on the valve seat side, and has a hollow portion that opens to the side opposite the valve seat, and a through hole that opens to a portion of the outside of the valve body that does not contact the valve seat and to the hollow portion, and a central axis of the through hole intersects with a central axis of the valve body. According to this pressure regulating valve, the fluid that has flowed into the hollow portion inside the valve body is discharged to the outside of the valve body through the through hole. This prevents the fluid inside the valve body from hitting the valve seat side of the valve body and returning to the open side of the valve body, thereby preventing the generation of pressure waves and vortexes. In addition, the central axis of the through hole intersects with the central axis of the valve body. This allows the fluid to be discharged to the outside of the valve body more quickly than when the central axis of the through hole is in a twisted position with respect to the central axis of the valve body. This therefore prevents self-excited vibration in the valve body.

[0007] The present disclosure can be realized in various forms, for example, in the form of a valve body of a pressure regulating valve, a fuel cell system including the pressure regulating valve of the present embodiment, and the like. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is an explanatory diagram showing a schematic configuration of a pressure regulating valve. [Diagram 2] FIG. 2 is an enlarged view of the valve body and its periphery in FIG. [Diagram 3] FIG. [Figure 4] FIG. 4 is a diagram showing an example of a relationship between upstream pressure and thrust force. [Diagram 5] FIG. 11 is an explanatory diagram showing a schematic configuration of a valve body in a second embodiment. [Figure 6] FIG. 11 is an explanatory diagram showing a schematic configuration of a valve body in a third embodiment. [Figure 7] FIG. 13 is an explanatory diagram showing a schematic configuration of a pressure regulating valve in a fourth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] A. First embodiment: FIG. 1 is an explanatory diagram showing a schematic configuration of a pressure regulating valve of this embodiment. FIG. 2 is an enlarged view of the periphery of a valve body 110 in FIG. 1. The pressure regulating valve 10 is provided, for example, in the middle of a fluid circuit connecting a gas tank of a fuel gas mounted on a fuel cell vehicle and a fuel cell, and reduces the pressure of high-pressure fuel gas before sending it to the fuel cell. The pressure regulating valve 10 includes a main body 30 provided with an inlet port 20 and an outlet port 40. The inlet port 20 is provided upstream of a central axis O of the main body 30. The outlet port 40 is provided at a position shifted from the central axis O, in the vicinity of a plug member 320 described later. The pressure of the fluid that flows in from the inlet port is adjusted in the main body 30, and the fluid is discharged from the outlet port 40.

[0010] The main body 30 includes, in order from the upstream in the flow direction of the fluid, a flow path portion 100 communicating with the inlet port 20, a first storage portion 200, a second storage portion 300, and a third storage portion 400 communicating with the outlet port 40. The flow path portion 100, the first storage portion 200, the second storage portion 300, and the third storage portion 400 have a cross section perpendicular to the central axis O formed to be substantially circular. The diameter of the flow path portion 100 is smaller than the diameter of the valve seat 210 of the first storage portion 200. The diameter of the first storage portion 200 is smaller than the diameter of the second storage portion 300. The diameter of the second storage portion 300 is smaller than the diameter of the third storage portion 400. The central axis of the flow path portion 100, the central axis of the first storage portion 200, the central axis of the second storage portion 300, and the central axis of the third storage portion 400 are coaxial with the central axis O.

[0011] The flow path portion 100 accommodates a valve body 110, an elastic member 120, and a support member .

[0012] The valve body 110 has a hollow portion 111, a first through hole 1121, and a second through hole 1122. Hereinafter, the first through hole 1121 and the second through hole 1122 are collectively referred to simply as a through hole 112. A gap on the outside of the valve body 110 in the flow path portion 100 is also referred to as a space 140. The shape of the valve body 110 will be described later.

[0013] The hollow portion 111 is closed on the valve seat 210 side of the first housing portion 200, and opens on the opposite side to the valve seat 210. The hollow portion 111 houses a part of the elastic member 120. The valve seat 210 will be described in detail later.

[0014] The through hole 112 is open to a portion of the outside of the valve body 110 that does not contact the valve seat 210, and to the hollow portion 111. In this embodiment, the cross section of the through hole 112 is substantially circular, and the central axis of the through hole 112 intersects with the central axis O of the valve body 110. In this embodiment, the central axis of the through hole 112 intersects with the central axis O of the valve body 110 perpendicularly. In this embodiment, the central axis of the first through hole 1121 and the central axis of the second through hole 1122 are the same.

[0015] FIG. 3 is an explanatory diagram of the valve body 110. In this embodiment, the valve body 110 is formed of a conical portion 113 and a column portion 114. The conical portion 113 is formed on the valve seat 210 side, and the tip is substantially conical. A part of the conical portion 113 is accommodated in the through hole 211 of the valve seat 210. When a part of the conical portion 113 is accommodated in the through hole 211, the conical portion 113 almost blocks the through hole 211. The column portion 114 is formed at the lower part of the conical portion 113, that is, on the opposite side of the conical portion 113 from the valve seat 210. The column portion 114 forms a hollow portion 111. As shown in FIG. 2, in this embodiment, the conical portion 113 forms the bottom surface of the hollow portion 111. The column portion 114 is substantially rectangular columnar, and each side of the side surface is chamfered. When viewed from the open side, the valve body 110 has a substantially octagonal shape, with each side recessed toward the center of the hollow portion 111 .

[0016] The elastic member 120 (see FIGS. 1 and 2) is a member that presses the valve body 110 against the valve seat 210. In this embodiment, the elastic member 120 is a coil spring. The support member 130 is located inside the elastic member 120 and supports the elastic member 120. The support member 130 may be omitted.

[0017] The first accommodating portion 200 includes a valve seat 210. The valve seat 210 has a through hole 211 at its center that is coaxial with the central axis O. The outer diameter of the through hole 211 is larger than the outer diameter of the tip of the conical portion 113 and smaller than the outer diameter of the column portion 114.

[0018] The second housing portion 300 houses a piston pin 310 and a plug member 320. The piston pin 310 has a conical shape with a tapered tip on the valve seat 210 side. The tip of the piston pin 310 is joined only to the tip of the conical portion 113 of the valve body 110. A joint portion 311 between the piston pin 310 and the valve body 110 is narrower than the inner diameter of the flow hole 211 of the valve body 110. The piston pin 310 is housed in the plug member 320. A gap 330 is generated between the tip of the piston pin 310 on the valve seat 210 side and the plug member 320. The plug member 320 has a cylindrical shape. The central axis of the piston pin 310 and the central axis of the plug member 320 are coaxial with the central axis O. The outer diameter of the plug member 320 is approximately the same as the inner diameter of the second housing portion 300. The length of the plug member 320 in the direction of the central axis O is greater than the length of the second accommodating portion 300 in the direction of the central axis O, and the plug member 320 protrudes toward the third accommodating portion 400 from the end face of the second accommodating portion 300 on the third accommodating portion 400 side.

[0019] The third accommodating portion 400 contains a piston 410 and a piston spring 420. The piston 410 and the piston pin 310 are joined together. Therefore, the piston 410 and the valve body 110 operate as a single unit.

[0020] The operation of the pressure regulating valve 10 will be described. When no fluid is supplied to the inlet port 20, the piston 410 is biased by the piston spring 420 toward the inlet port 20 more than when fluid is supplied. The plug member 320 protrudes toward the third housing portion 400 from the end face of the second housing portion 300 on the third housing portion 400 side. As a result, the piston 410 stops at a position where it abuts against the plug member 320. In this state, the joint portion 311 between the piston pin 310 and the valve body 110 is located at the position of the circulation hole 211 of the valve seat 210. Since the joint portion between the piston pin 310 and the valve body 110 is narrower than the inner diameter of the circulation hole 211 as described above, a gap 230 is generated between the circulation hole 211 and the joint portion 311. Therefore, the flow passage portion 100 and the gap 330 of the second housing portion 300 are connected via this gap 230.

[0021] The fluid flows in the direction of the arrow shown in FIG. 2. More specifically, the fluid supplied from the inlet port 20 through the flow path passes through the space 140, the hollow portion 111, and the through hole 112, and is output to the flow hole 211. When the fluid flows into the hollow portion 111 and flows through the through hole 112 to the space 140, a pressure loss occurs. As a result, the pressure in the flow path portion 100 becomes lower than the pressure in the second storage portion 300. Due to this pressure difference, the valve body 110 is pushed upward together with the piston 410. Therefore, the fluid flows through the gap 430 generated between the third storage portion 400 and the piston 410 to the output port (see FIG. 1). As a result, the pressure in the second storage portion 300 decreases.

[0022] FIG. 4 is a diagram showing an example of the relationship between the upstream pressure and the thrust. In FIG. 4, the horizontal axis is the pressure of the fluid flowing into the pressure regulating valve 10, and the vertical axis is the thrust pushing the valve element 110 toward the valve seat 210. The pressure of the fluid flowing into the pressure regulating valve 10 is measured at point P1 shown in FIG. 2. The thrust pushing the valve element 110 up is obtained by visualizing the position of the valve element 110 in the direction of the central axis O, and based on a map or function that defines the relationship between the position of the valve element 110 and the thrust. FIG. 4 shows an approximation curve of the thrust at each pressure. In FIG. 4, as a comparative example, the thrust when the valve element 110 in the embodiment is replaced with a valve element without a through hole is shown.

[0023] As shown in FIG. 4, in a range PP1 where the upstream pressure is in a range of pressure Pr1 or more and pressure Pr2 or less, the thrust force pushing the valve element 110 toward the valve seat 210 increases with an increase in the upstream pressure because the valve of the fuel tank connected to the inlet port 20 and the valve of the fluid circuit downstream of the outlet port 40 are opened, and the pressure regulating valve 10 is closed. More specifically, the pressure of the fuel tank increases, the flow rate of the fluid flowing into the pressure regulating valve 10 increases, and the thrust force pushing the valve element 110 toward the valve seat 210 increases. In a range PP2 where the upstream pressure is in a range of pressure Pr2 or more and pressure Pr3 or less, the thrust force pushing the valve element 110 toward the valve seat 210 decreases with an increase in the upstream pressure because the pressure regulating valve 10 closes. More specifically, when the pressure regulating valve 10 closes, not only the valve element 110 but also the valve seat 210 shares the load, and the thrust force pushing the valve element 110 toward the valve seat 210 decreases. The thrust in this embodiment is lower than that in the comparative example and is less than the threshold value Tth. The threshold value Tth is a limit value at which the valve body 110 is not plastically deformed even when pressed against the valve seat 210 by the thrust. That is, in this embodiment, the plastic deformation of the valve body 110 is suppressed.

[0024] According to the pressure regulating valve of this embodiment described above, the fluid that has flowed into the hollow portion 111 inside the valve body 110 is discharged to the outside of the valve body 110 through the through hole. Therefore, the fluid inside the valve body 110 can be prevented from hitting the valve seat 210 side of the valve body 110 and returning to the open side of the valve body 110, thereby preventing the generation of pressure waves and vortexes. Therefore, self-excited vibration in the valve body 110 can be suppressed. In addition, the central axis of the through hole intersects with the central axis of the valve body 110. Therefore, the fluid can be discharged to the outside of the valve body 110 more quickly than when the central axis of the through hole is in a twisted position with respect to the central axis of the valve body 110.

[0025] In this embodiment, the central axis of the first through hole 1121 is the same as the central axis of the second through hole 1122. Therefore, the discharge of the fluid from the hollow portion 111 to the outside of the valve body 110 is leveled, and the flow of the fluid in the hollow portion 111 is leveled. Therefore, self-excited vibration in the valve body 110 can be suppressed.

[0026] B. Second embodiment: FIG. 5 is an explanatory diagram showing a schematic configuration of a valve body 110B in the second embodiment. In this embodiment, the valve body 110B is different from the first embodiment in that the through hole 112B is elongated in the direction of the central axis O, and other configurations are the same as those of the first embodiment. The through hole 112B is shaped as two parallel lines of equal length and two semicircles. This second embodiment also has almost the same effects as the first embodiment. The through hole may be substantially rectangular or polygonal.

[0027] C. Third embodiment: 6 is an explanatory diagram showing a schematic configuration of a valve body 110C in the third embodiment. In this embodiment, the valve body 110C is different from the first embodiment in that a through hole 112C is provided in a cone portion 113, and other configurations are the same as those in the first embodiment. As shown in FIG. 6, in this embodiment, , Kan The through hole 112C penetrates the side surface of the conical portion 113 so as to intersect with the central axis O of the valve body 110, and the hollow portion 111C More specifically, the through hole 112C has a through portion that passes through the conical portion 113 in a direction intersecting the central axis O of the valve body, and a communication portion 1111 that communicates between the through portion and the hollow portion 111C. The third embodiment also has substantially the same effects as the first and second embodiments. Note that the through hole 112C is provided at a position where it does not come into contact with the valve seat 210 even when the valve body 110C comes into contact with the valve seat 210.

[0028] D. Fourth embodiment: 7 is an explanatory diagram showing a schematic configuration of a pressure regulating valve in the fourth embodiment. This embodiment differs from the first embodiment in that the length of the support member 130D is 30% or more of the entire length of the elastic member 120, but the other configurations are the same as those of the first embodiment.

[0029] According to this embodiment, the volume occupied by the support member 130 in the hollow portion 111 of the valve body 110 increases. Therefore, the amount of fluid flowing into the hollow portion 111 can be reduced, and the thrust force pushing up the valve body 110 can be suppressed.

[0030] E. Other embodiments: (E1) In the above-described embodiment, the valve body 110 has two through holes 1121, 1122. This is not a limitation, and the valve body 110 may have only one through hole, or may have three or more through holes. Furthermore, the central axis of the first through hole 1121 and the central axis of the second through hole 1122 are the same. This is not a limitation, and the central axis of the first through hole 1121 and the central axis of the second through hole 1122 may be different.

[0031] (E2) In the above-described embodiment, the central axis of the through hole 112 perpendicularly intersects with the central axis O of the valve body 110. This is not limiting, and the central axis of the through hole 112 may intersect with the central axis O of the valve body 110 at any angle. Note that the angle between the central axis of the through hole 112 and the central axis O of the valve body 110 is preferably within a range of 90±10 degrees. Furthermore, it is more preferable that the angle between the central axis of the through hole 112 and the central axis O of the valve body 110 is 90 degrees or less.

[0032] (E3) In the above-described embodiment, the hollow portion 111 accommodates a part of the elastic member 120. This is not limiting, and the hollow portion 111 may accommodate the entire elastic member 120.

[0033] The present disclosure is not limited to the above-mentioned embodiment, and can be realized in various configurations without departing from the spirit of the present disclosure. For example, the technical features in the embodiments corresponding to the technical features in each form described in the Summary of the Invention column can be appropriately replaced or combined in order to solve the above-mentioned problems or to achieve some or all of the above-mentioned effects. Furthermore, if the technical feature is not described as essential in this specification, it can be appropriately deleted. [Explanation of symbols]

[0034] 10... pressure regulating valve, 20... inlet port, 30... main body, 40... outlet port, 100... flow path portion, 110, 110B, 110C... valve body, 111, 111C... hollow portion, 112, 112B, 112C... through hole, 1111... communicationportion, 1121...first through hole, 1122...second through hole, 113...conical portion, 114...column portion, 120...elastic member, 130, 130D...support member, 140...space, 200...first storage portion, 210...valve seat, 211...flow hole, 230, 330, 430...gap, 300...second storage portion, 310...piston pin, 311...joint portion, 320...plug member, 400...third storage portion, 410...piston, 420...piston spring, O...center axis

Claims

1. A pressure regulating valve, A valve body, a valve seat that contacts the valve body and into which a fluid flows from a side that contacts the valve body; an elastic member that presses the valve body against the valve seat, The valve body is a hollow portion that accommodates at least a portion of the elastic member and that opens to a side opposite the valve seat; a through hole communicating a portion of the outer side of the valve body that does not contact the valve seat with the hollow portion; The pillars and a conical portion having a substantially conical shape and provided on the valve seat side relative to the column portion, The hollow portion is formed in the column portion, The through hole has a through portion that passes through the conical portion in a direction intersecting with a central axis of the valve body, and a communication portion that communicates between the through portion and the hollow portion.

2. The pressure regulating valve according to claim 1, The pressure regulating valve, wherein the through hole has any one of a substantially circular shape, a substantially rectangular shape, a polygonal shape, and a shape consisting of two parallel lines of equal length and two semicircles.

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