Fluid on / off valve

Abstract

This application provides a fluid on / off valve that reliably switches between three modes without using a magnet: closed passage below a specified low-pressure side, open passage at an operating pressure, and closed passage above a specified high-pressure side. It comprises: a cam structure disposed in a diaphragm chamber, moving together with the diaphragm in a first direction and a second direction, the first direction being the displacement direction of the diaphragm towards the diaphragm chamber, and the second direction being the displacement direction of the diaphragm towards the constant pressure chamber; and a valve body component that opens and closes a valve seat by moving in a third direction and a fourth direction, the third and fourth directions being orthogonal to the first and second directions, the third direction being the direction of the inflow passage from the valve seat to the diaphragm chamber, and the fourth direction being the direction of the inflow passage from the diaphragm chamber to the valve seat. The cam structure converts the movement of the diaphragm in the first and second directions into movement of the valve body component in the third and fourth directions to open and close the passage.

Description

TECHNICAL FIELD

[0001] The present application relates to an open-close valve that switches opening and closing of a flow path according to pressure of a fluid, and for example, can be applied to opening and closing of a gas pipe or the like. BACKGROUND

[0002] As an open-close valve of a fluid, there is an open-close valve that switches opening and closing of a flow path according to pressure of a fluid, and closes the flow path in a state where the fluid pressure is lower than a low-pressure-side prescribed pressure, opens the flow path in a state where the fluid pressure is between a low-pressure-side prescribed pressure and a high-pressure-side prescribed pressure, and closes the flow path when the fluid pressure is higher than the high-pressure-side prescribed pressure. In the fluid open-close valve described in Patent Literature 1, in order to switch and maintain three states of closing, opening, and closing, a diaphragm that displaces according to pressure and a magnet that maintains the position of the diaphragm are used.

[0003] PRIOR ART DOCUMENTS

[0004] PATENT LITERATURE

[0005] Patent Literature 1: Utility Model Publication No. CN213745105U SUMMARY

[0006] PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] However, the magnetic force of the magnet decreases when the ambient temperature is high, and thus there is a case where it is difficult to maintain a prescribed state. Therefore, even in a state where the flow path needs to be closed to cut off the flow of gas, it can not be possible to maintain the flow path closed, and the gas can flow.

[0008] The present application is made in view of the above, and an object thereof is to maintain a state where a valve body member opens a flow path and a state where the valve body member closes the flow path by displacement of a diaphragm without using a magnet.

[0009] SOLUTION TO PROBLEM

[0010] The first embodiment of the present application includes: a valve body including a diaphragm chamber, an inflow passage through which fluid flows into the diaphragm chamber, a valve seat formed on the side opposite to the diaphragm chamber of the inflow passage, and an outflow passage through which fluid flows out of the diaphragm chamber; a valve cover forming a constant pressure chamber configured to be disposed opposite to the diaphragm chamber with the diaphragm and to maintain a predetermined pressure inside; a cam structure configured to be disposed in the diaphragm chamber and to move in a first direction and a second direction together with the diaphragm, the first direction being a displacement direction of the diaphragm to the diaphragm chamber side, and the second direction being a displacement direction of the diaphragm to the constant pressure chamber side; a diaphragm urging spring configured to urge the diaphragm in the first direction; a cam guide configured to support the movement of the cam structure in the first direction and the second direction; and a valve body member configured to open and close the valve seat by moving in a third direction and a fourth direction, the third direction and the fourth direction being directions orthogonal to the first direction and the second direction, the third direction being a direction in which the inflow passage is from the valve seat to the diaphragm chamber, and the fourth direction being a direction in which the inflow passage is from the diaphragm chamber to the valve seat.

[0011] Further, the first cam structure of the present application is configured such that a first cam surface formed on the end side in the first direction and a second cam surface formed on the end side in the second direction are displaced more in the third direction than a third cam surface formed on the intermediate portion in the first direction and the second direction. Further, the first valve body member of the present application includes a valve main body configured to abut against and separate from the valve seat, and a valve stem configured to convert the movement of the cam structure in the first direction and the second direction into displacement in the third direction and the fourth direction and transmit the displacement to the valve main body by abutting against the cam structure.

[0012] According to the first embodiment of the present application, the displacement of the diaphragm in the first direction and the second direction is converted into the displacement of the valve body member in the third direction and the fourth direction by the cooperation of the cam structure and the valve stem. Therefore, without a magnet or the like, it is possible to maintain the position of the valve body member at the position of the first cam surface, the position of the second cam surface, and the position of the third cam surface.

[0013] The position of the second cam surface is on the end side in the second direction of the cam structure, and thus is a state in which the diaphragm is maximally displaced in the first direction. This corresponds to a state in which the pressure in the diaphragm chamber is lower than the pressure in the constant pressure chamber. Further, in this state, the valve stem is displaced in the third direction, the valve main body abuts against the valve seat, and the inflow passage is closed.

[0014] The position of the third cam surface is on the intermediate portion in the first direction and the second direction of the cam structure, and thus the diaphragm is displaced in the second direction from the end side in the first direction (the position of the second cam surface). That is, the pressure in the diaphragm chamber becomes an operation pressure that is intermediate between the predetermined pressure on the low pressure side and the predetermined pressure on the high pressure side. In this state, the valve stem is displaced in the fourth direction, the valve main body separates from the valve seat, and the inflow passage is opened. Thus, it is possible to flow the fluid at the operation pressure.

[0015] The first cam surface is positioned at the end side in the first direction of the cam structure, and is a state in which the diaphragm is maximally displaced in the second direction. This corresponds to a state in which the pressure in the diaphragm chamber is higher than the prescribed pressure on the high-pressure side with respect to the pressure in the constant-pressure chamber. Since fluid flow at the high pressure is not desired, in this state, the valve stem is displaced in the third direction. As a result, the valve body abuts against the valve seat, closing the inflow passage.

[0016] In the second embodiment of the present application, the valve body member further includes a valve force spring that applies a force to the valve body toward the valve seat. By providing the valve force spring, the operation of the valve body member can be stabilized.

[0017] In the third embodiment of the present application, the valve stem of the valve body member houses a ball member at the tip end in the third direction in a rotatable manner. By providing the ball member, the valve stem easily slides with respect to the cam structure. As a result, the movement of the valve stem between the second cam surface and the third cam surface and the movement between the third cam surface and the second cam surface are smoother.

[0018] In the fourth embodiment of the present application, the valve stem of the valve body member houses a slide member at the tip end in the third direction in a movable manner in the third direction and the fourth direction, and includes a slide member force spring that applies a force to the slide member in the third direction. The slide member can be smoothly moved with respect to the cam structure. In addition, the amount of movement of the slide member in the third direction and the fourth direction is smaller than the displacement amount between the second cam surface and the third cam surface and the displacement amount between the third cam surface and the first cam surface, and thus the valve stem can be displaced in the third direction and the fourth direction with respect to the cam structure.

[0019] In the fifth embodiment of the present application, the first cam surface, the second cam surface, and the third cam surface of the cam structure are planes parallel to the first direction and the second direction. Furthermore, the second cam surface and the third cam surface are inclined surfaces that are inclined more toward the fourth direction as they go in the first direction, and the third cam surface and the first cam surface are inclined surfaces that are inclined more toward the third direction as they go in the first direction.

[0020] Since the first cam surface, the second cam surface, and the third cam surface are planes parallel to the first direction and the second direction, even if the diaphragm is displaced in the first direction and the second direction due to a slight change in fluid pressure in a state in which the valve stem is engaged with the first cam surface, the second cam surface, and the third cam surface, the valve body member can maintain its position. As a result, the opening and closing of the valve body to the valve seat can be stabilized.

[0021] In the sixth embodiment of the present application, the cam structure has a first cam surface recessed in the third direction on the first cam surface to receive the third direction tip of the valve stem. As described above, the valve stem abutting against the first cam surface is a state in which the pressure in the diaphragm chamber is higher than the prescribed pressure on the high pressure side. In this state, the valve body preferably reliably closes the inflow passage by abutting against the valve seat. Therefore, by fitting the third direction tip of the valve stem into the first cam surface recess, the closed state of the valve body can be reliably maintained.

[0022] In the seventh embodiment of the present application, the cam structure has a second cam surface recessed in the third direction on the second cam surface to receive the third direction tip of the valve stem. The valve stem abutting against the second cam surface is a state in which the pressure in the diaphragm chamber is lower than the prescribed pressure on the low pressure side. This state also includes a state in which the fluid on-off valve is not connected to the flow path. That is, it also includes a state during transportation of the fluid on-off valve, which is preferably a state in which the cam structure and the valve body member do not move. Therefore, by fitting the third direction tip of the valve stem into the first cam surface recess, the closed state of the valve body can be reliably maintained.

[0023] In the eighth embodiment of the present application, the cam structure has a third cam surface protrusion protruding in the fourth direction on the third cam surface to hinder movement of the valve stem in the first direction and the second direction. The valve stem abutting against the third cam surface is a state in which the fluid is at a prescribed operating pressure, which is preferably a state in which the valve body opens the inflow passage as much as possible from the valve seat. Therefore, by providing the third cam surface protrusion, unnecessary movement of the valve stem to the second cam surface side and the first cam surface side is restricted.

[0024] In the ninth embodiment of the present application, a flow rate regulating valve that regulates the flow rate of fluid is provided on the upstream side of the fluid flow of the valve body member of the inflow passage of the valve body. Furthermore, the flow rate regulating valve has a throttle portion provided on the upstream side of the fluid flow of the valve body in the inflow passage, a ball valve provided on the upstream side of the fluid flow of the throttle portion so as to oppose the throttle portion, and a ball valve urging spring that urges the ball valve in a direction away from the throttle portion.

[0025] If the fluid flow rate increases beyond the urging force of the ball valve urging spring, the ball valve is displaced to the throttle portion side. As a result, the flow path of the fluid between the ball valve and the throttle portion is throttled, the flow resistance increases, and the flow rate is restricted. Conversely, if the flow rate is below an appropriate value, the urging force of the ball valve urging spring causes the ball valve to move away from the throttle portion. As a result, the flow resistance between the ball valve and the throttle portion decreases, and the flow rate increases. The operation of this flow rate regulating valve is linked to the downstream fluid on-off. For example, even if the fluid flow rate fluctuates, the operation of the downstream fluid on-off valve can be stabilized by using the flow rate regulating valve.

[0026] In the tenth embodiment of the present application, a fluid switching valve that switches and closes a fluid flow is provided in an outflow passage of a valve body. Further, the fluid switching valve is provided with a valve chamber that is cylindrical and is located in the outflow passage, and a cylindrical rotation support portion that is continuous with the valve chamber in the axial direction. In addition, there are provided a valve member that has a valve base portion provided in the rotation support portion in a rotatable manner, and a valve portion that rotates in conjunction with the valve base portion and rotates in the valve chamber, and a seal member that rotates in conjunction with the valve portion and closes an opening portion of the outflow passage that faces the valve chamber.

[0027] Further, in the fluid switching valve of the tenth embodiment of the present application, the position of the rotation center axis of the seal member when the seal member rotates is eccentric with respect to the position of the center axis of the valve chamber, and the seal member is pressed against the opening portion in accordance with the rotation of the seal member.

[0028] In the tenth embodiment of the present application, the position of the rotation center axis of the seal member when the seal member rotates is eccentric with respect to the position of the center axis of the valve chamber, and as a result, the radial position of the seal member is displaced in accordance with the rotation of the seal member. Therefore, the seal member can be pressed against either one of the fluid inlet passage and the fluid outlet passage using this displacement. By the pressing of the seal member, the seal member can reliably seal either one of the fluid inlet passage and the fluid outlet passage.

[0029] In the eleventh embodiment of the present application, an outflow pipe is provided downstream of the outflow passage of the valve body. Further, the outflow pipe is held in a rotatable manner with respect to the valve body. Thereby, the installation direction of a pipe connected to the outflow pipe can be freely set. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a cross-sectional view of a first state of the fluid opening and closing valve.

[0031] Figure 2 is a cross-sectional view of a second state of the fluid opening and closing valve.

[0032] Figure 3 is a cross-sectional view of a third state of the fluid opening and closing valve.

[0033] Figure 4 is a cross-sectional view along the line IV-IV of Figure 1

[0034] Figure 5 is a cross-sectional view of a state in which the valve portion is rotated by 90 degrees from the state of Figure 4

[0035] Figure 6 is a cross-sectional view of a cam structure.

[0036] Figure 7 is a cross-sectional view of another embodiment of the cam structure.​​

[0037] Figure 8 This is a cross-sectional view of another embodiment of the valve stem.

[0038] Figure 9 This is a cross-sectional view of another embodiment of the valve stem.

[0039] Figure 10 This is a cross-sectional view of another embodiment of the valve stem.

[0040] Figure 11 This is a cross-sectional view of another embodiment of the valve stem.

[0041] Explanation of reference numerals in the attached figures

[0042] 1: Fluid on / off valve

[0043] 100: Valve body

[0044] 110: Diaphragm Chamber

[0045] 120: Inflow route

[0046] 130: Valve seat

[0047] 140: Outflow pathway

[0048] 300: Valve Cover

[0049] 310: Diaphragm

[0050] 400: Cam structure

[0051] 410: First Cam Surface

[0052] 420: Second Cam Surface

[0053] 430: Third Cam Surface

[0054] 500: Valve body component Detailed Implementation

[0055] exist Figures 1 to 3 In this design, 1 represents a fluid on / off valve. 100 represents the valve body, which is die-cast from aluminum or an aluminum alloy. A cylindrical diaphragm chamber 110 with a maximum diameter of approximately 50-60 mm is formed on the valve body 100. Additionally, an inflow passage 120 is formed on the valve body 100 to allow fluid to flow into the diaphragm chamber 110. Furthermore, in this example, natural gas is used as the fluid. The inflow passage 120 is connected to a gas inlet pipe from a gas company, etc. The inner diameter of the inflow passage 120 is approximately 5-10 mm.

[0056] A valve seat 130 is formed on the valve body 100 on the side opposite to the diaphragm chamber 110 of the inflow passage 120. Additionally, an outflow passage 140 is formed on the valve body 100 to allow fluid to flow out of the diaphragm chamber 110. The inner diameter of the outflow passage 140 is approximately 5 to 10 millimeters. Furthermore, an outflow pipe 200 made of resin such as polyacetal (POM) or nylon is disposed downstream of the outflow passage 140.

[0057] The outlet pipe 200 and the outlet passage 140 of the valve body 100 are sealed by an O-ring 210. Furthermore, the outlet pipe 200 and the outlet passage 140 of the valve body 100 are prevented from detaching by a retaining spring 220. Additionally, the outlet pipe 200 can rotate 360 ​​degrees relative to the valve body 100. A gas pipe connecting a gas appliance such as a household gas stove to the fluid on / off valve 1 is connected to the outlet pipe 200. Therefore, a gas pipe anti-detachment structure 230 is formed on the outer periphery of the outlet pipe 200.

[0058] A valve cover 300 made of aluminum or aluminum alloy is disposed opposite to the diaphragm chamber 110 of the valve body 100. The outer periphery of a nitrile rubber diaphragm 310 is held between the valve cover 300 and the valve body 100. Therefore, the diaphragm 310 seals the diaphragm chamber 110. Additionally, the diaphragm 310 separates the valve cover 300 from the diaphragm chamber 110. A pressure-regulating chamber 320 is formed between the interior of the valve cover 300 and the diaphragm 310. The pressure-regulating chamber 320 communicates with the atmosphere through a cylindrical opening 330; therefore, the pressure-regulating chamber 320 is at atmospheric pressure.

[0059] A metal rod 340 is disposed on the inner periphery of the diaphragm 310. The rod 340 is made of stainless steel, iron, aluminum, or aluminum alloy. Moreover, the rod 340 is cylindrical in shape with a diameter of about 5 mm and a length of about 30 mm.

[0060] A disc-shaped retaining plate 350 made of resin such as polyacetal (POM) or nylon is disposed on the inner periphery of the diaphragm 310. Furthermore, the inner periphery of the diaphragm 310, together with the retaining plate 350, is formed and clamped by the flange portion 341 and nut 342 of the rod 340. The upper portion of the rod 340 is slidably supported by the opening 330 of the valve cover 300. That is, the lower portion of the rod 340 is held by the inner periphery of the diaphragm 310, and the upper portion is held by the opening 330.

[0061] A shoulder 343 is formed on the upper part of the rod 340, and a clamping part 360 is engaged with the shoulder 343. The clamping part 360 is made of resin such as polyacetal (POM) or nylon, and is generally cylindrical. A disc-shaped connecting part 361 is mounted on the inner circumference of the middle part of the cylinder. In the clamping part 360, the connecting part 361 is engaged with the shoulder 343 of the rod 340 and is fastened and fixed by a nut 344 in this state.

[0062] A cylindrical clamping guide 362, with an inner diameter slightly larger than the outer diameter of the clamping portion 360, is disposed on the outer periphery of the clamping portion 360. This clamping guide 362 is also made of resin such as polyacetal (POM) or nylon. A locking portion 363 is formed at the lower end of the clamping guide 362, which is bent inwards and held on the upper surface of the valve cover 300. That is, on the valve cover 300, the spring frame 365 is fixed by a retaining spring 366, and the clamping guide 362 is pressed against the valve cover 300 by a clamping guide fixing spring 364 located between the spring frame 365 and the locking portion 363. Thus, even when the clamping portion 360 is displaced to its maximum extent in the first direction, the shaking of the clamping guide 362 can be effectively suppressed. However, the clamping guide 362 can also be directly welded to the valve cover 300.

[0063] A diaphragm force spring 370 is disposed in the constant pressure chamber 320 to press the diaphragm 310 toward the diaphragm chamber 110. The diaphragm force spring 370 is made of spring steel, with one end abutting against the retaining plate 350 and the other end abutting against the abutting surface 301 formed on the valve cover 300.

[0064] A cam structure 400 is disposed at the lower end of the rod 340. The cam structure 400 is made of resin such as polyacetal (POM) or nylon and is fused to the lower end of the rod 340. In this example, the diaphragm 310, the rod 340, and the cam structure 400 are adjusted according to the pressure difference between the diaphragm chamber 110 and the constant pressure chamber 320. Figures 1 to 3 The displacement is in the vertical direction. However, the configuration of the fluid on / off valve 1 in the figure is an example, and the rod 340 and the like are not limited to vertical movement. Therefore, the downward direction in the figure is referred to as the first direction, and the upward direction is referred to as the second direction. The first direction is the direction in which the diaphragm 310 and the like displace towards the diaphragm chamber 110. In addition, the second direction is the direction in which the diaphragm 310 and the like displace towards the constant pressure chamber 320.

[0065] Furthermore, the right direction, orthogonal to both the first and second directions, is designated as the third direction, and the left direction as the fourth direction. The third direction is both the flow direction of fluid from valve seat 130 to diaphragm chamber 110 in the inflow passage 120 and the direction in which valve seat 130 is closed. Moreover, the fourth direction is both the flow direction from diaphragm chamber 110 to valve seat 130 in the inflow passage 120 and the direction in which valve seat 130 is opened.

[0066] A first cam surface 410 is formed on the end side of the cam structure 400 in a first direction (lower side). The first cam surface 410 is substantially flat in both the first and second directions (vertical direction). A second cam surface 420 is also formed on the end side of the cam structure 400 in a second direction (upper side). The second cam surface 420 is also substantially flat in both the first and second directions (vertical direction). Furthermore, the first cam surface 410 and the second cam surface 420 are formed at substantially the same positions in the third and fourth directions (left-right direction).

[0067] A third cam surface 430 is formed at the midpoint of the first and second (vertical) directions of the cam structure 400. This third cam surface 430 is also generally flat in both the first and second (vertical) directions. Furthermore, compared to the first cam surface 410 and the second cam surface 420, the third cam surface 430 is located in a fourth direction (left side). In other words, the first cam surface 410 and the second cam surface 420 are located further away from the valve seat 130 (third direction) than the third cam surface 430.

[0068] The third cam surface 430 of the cam structure 400 is an inclined surface (first inclined surface 440) that slopes towards the third direction (right side) as it moves towards the first direction (downward). In addition, the second cam surface 420 is an inclined surface (second inclined surface 450) that slopes towards the fourth direction (left side) as it moves towards the first direction (downward).

[0069] The bottom surface 460 of the cam structure 400, which is opposite to the surface on which the first to third cam surfaces 410, 420, and 430 are formed, is flat in both the first and second directions (vertical direction). Furthermore, this bottom surface 460 is supported by a support surface 150 formed on the valve body 100. That is, the cam structure 400 slides along the support surface 150 in both the first and second directions (vertical direction). Therefore, the support surface 150 also acts as a cam guide supporting the movement of the cam structure 400 in both the first and second directions (vertical direction). However, the rod 340 also supports the movement of the cam structure 400 in both the first and second directions (vertical direction). As described above, the movement of the rod 340 is controlled by the inner periphery of the diaphragm 310 holding the lower portion and the opening 330 holding the upper portion; therefore, the diaphragm 310 and the opening 330 also act as cam guides supporting the movement of the cam structure 400 in both the first and second directions (vertical direction).

[0070] A valve body component 500 is grounded in connection with the cam structure 400. The valve body component 500 is made of resin such as polyacetal (POM) or nylon, and is integrally formed with a valve body 510 and a valve stem 520. The valve body 510 abuts against and disengages from the valve seat 130, and the valve stem 520 is connected to the cam structure 400.

[0071] The valve stem 520 is held in the holding passage 160 of the valve body 100 in a state that allows it to move in a third and a fourth direction (left and right). The top end 521 of the valve stem 520 is spherical and can move smoothly along the first cam surface 410, the first inclined surface 440, the third cam surface 430, the second inclined surface 450, and the second cam surface 420 of the cam structure 400.

[0072] A rubber seal 511 is bonded to the surface of the valve body 510 that abuts against the valve seat 130, reliably closing the inflow passage 120 when the valve body 510 is seated on the valve seat 130. Additionally, the force applied by the valve force spring 530 presses the valve body 510 against the valve seat 130, ensuring a reliable seal when the valve body 510 is seated on the valve seat 130.

[0073] A flow regulating valve 600 is disposed upstream of the valve body component 500 in the inflow passage 120. One end of the valve force spring 530 is engaged with the passage throttling section 610 of the flow regulating valve 600. The other end of the valve force spring 530 abuts against the valve body 510.

[0074] A ball valve 620 is disposed on the flow control valve 600 opposite to the passage throttling section 610. A ball valve force spring 630 is disposed between the ball valve 620 and the passage throttling section 610, applying force to the ball valve 620 in a direction away from the passage throttling section 610. The ball valve 620 and the ball valve force spring 630 are disposed within the flow control valve housing 640. A plurality of passage holes 641 are formed within the flow control valve housing 640, and the flow control valve housing 640 does not throttle the flow into the passage 120. Furthermore, the passage throttling section 610, the ball valve 620, and the flow control valve housing 640 are all made of resins such as polyacetal (POM) or nylon. Moreover, the passage throttling section 610 is bonded to the flow control valve housing 640.

[0075] A fluid switching valve 700, capable of switching the opening and closing of the flow passage, is disposed within the outflow passage 140. The fluid switching valve 700 includes a valve component 710 and a sealing component 720. For example... Figure 4 as well as Figure 5 As shown, a valve chamber 705 is formed in a manner that traverses a straight outflow passage 140. Furthermore, a valve component 710 and a sealing component 720 are disposed in the valve chamber 705.

[0076] A rotating support portion 730 with a circular cross-section is formed on the valve body 100. The inner diameter of the rotating support portion 730 is approximately 15 mm. A valve chamber 705 with an opening in the outflow passage 140 is formed below the rotating support portion 730. The rotating support portion 730 and the valve chamber 705 are continuous cylindrical shapes with equal diameters.

[0077] The valve component 710 is made of resin such as polyacetal (POM) or nylon, and includes: a valve base 711, which is fitted into and rotates within the rotating support portion 730; and a valve portion 712, integrally formed below the valve base 711, which rotates within the valve chamber 705. Both the valve base 711 and the valve portion 712 are cylindrical, and the outer diameter of the valve base 711 is approximately the same as the inner diameter of the rotating support portion 730.

[0078] An O-ring retaining groove is formed on the bottom 711 of the valve base to retain the valve O-ring 713. The valve O-ring 713 is in tight contact with the inner circumference of the rotating support portion 730 to prevent fluid from leaking out of the valve chamber 705.

[0079] The outer diameter of the valve section 712 is about 10 mm, and the central axis B of the valve section 712 is about 1 mm off-center from the central axis A of the valve base bottom 711 and the rotating support section 730. Therefore, the valve section 712 rotates eccentrically within the valve chamber 705.

[0080] A ring-shaped sealing member 720 made of rubber is disposed on the outer periphery of the valve portion 712, opposite to the outflow passage 140. In addition, a knurled groove is formed on the outer periphery of the valve portion 712 where the sealing member 720 is disposed, so as to reliably retain the sealing member 720 in the valve portion 712.

[0081] Next, the operation of the fluid switching valve 1 with the above-described structure will be explained. During normal operation, the fluid switching valve 700... Figure 5 Open the outflow path 140 in the state. Figure 1 The states are the state before the fluid on / off valve 1 is connected to the gas pipe, and the first state after it is connected to the gas pipe but the gas pressure is higher than atmospheric pressure but less than 1 kPa. Figure 1 In the first state, the diaphragm force spring 370 displaces the diaphragm 310 toward the diaphragm chamber 110 (first direction). Therefore, the top end 521 of the valve stem 520 abuts against the second cam surface 420.

[0082] The state of the valve body component 500 is maintained by the pressing force of the valve force spring 530. Therefore, even in the state of single transport before the fluid opening and closing valve 1 is connected to the pipeline, the movement of the rod 340 and the valve body component 500 is effectively suppressed by the applied force of the diaphragm force spring 370 and the valve force spring 530.

[0083] When the fluid on / off valve 1 is connected to the gas pipeline and the pressure in the diaphragm chamber 110 exceeds atmospheric pressure by approximately 1 kPa, the diaphragm 310 resists the force applied by the diaphragm force spring 370 and displaces towards the pressure-regulating chamber 320 (second direction). With this displacement, the cam structure 400 also moves in the second direction. Based on this movement of the cam structure 400, the top end 521 of the valve stem 520 abuts against the second inclined surface 450 and moves in the direction that causes the valve body 510 to move away from the valve seat 130 (fourth direction).

[0084] Figure 2 This is the second state in which the top end 521 of the valve stem 520 abuts against the third cam surface 430 via the second inclined surface 450. Figure 2 In the second state, the seal 511 of the valve body 510 detaches from the valve seat 130, and the inflow passage 120 is opened. In this state, the flow rate of the gas is regulated by the flow regulating valve 600.

[0085] The ball valve spring 630 presses the ball valve 620 of the flow regulating valve 600 against the flow regulating valve housing 640. Therefore, normally the flow path throttling section 610 allows a predetermined amount of gas to flow without throttling. However, when the gas flow exceeds the predetermined amount, the ball valve 620 resists the force applied by the ball valve spring 630 and moves towards the flow path throttling section 610. Then, the ball valve 620 and the flow path throttling section 610 throttle the gas flow path, limiting the gas flow. Through the cooperation of the ball valve 620, the flow path throttling section 610, and the ball valve spring 630, the gas flow is regulated to a predetermined amount. Especially in this embodiment, the operation of the flow regulating valve 600 is linked to the downstream fluid on / off valve 1. When switching from the first state to the second state according to the movement of the diaphragm 310, the gas flow increases abruptly from zero. Furthermore, in the second state, the gas flow may also increase sharply. In this case, the operation of the downstream fluid on / off valve 1 can be stabilized due to the presence of the flow regulating valve 600.

[0086] The third cam surface 430 has a predetermined distance, so even if the pressure inside the diaphragm chamber 110 rises to more than 1 kPa above atmospheric pressure, causing the cam structure 400 to move in the first direction, it can still maintain [the desired position]. Figure 2 The second state is shown. The second state is when the gas pressure in the diaphragm chamber 110 is about 0.8 to 8 kPa higher than the atmospheric pressure in the constant pressure chamber 320.

[0087] That is, the specified operating pressure of the gas is approximately 0.8 to 8 kPa higher than atmospheric pressure. When it falls below the specified low-pressure side pressure, i.e., 0.8 kPa, the tip 521 of the valve stem 520 crosses the second inclined surface 450 and contacts the first cam surface 410. That is, it returns to... Figure 1 The first state is shown.

[0088] From the second state ( Figure 2 ) and the first state ( Figure 1 As can be seen from the comparison, the upper part of the clamping part 360 protrudes about halfway from the clamping guide 362. By marking the upper part of the clamping part 360 with a specified color or mark, the state of the fluid opening and closing valve 1 operating at a specified operating pressure can be visually indicated.

[0089] When the gas pressure in the diaphragm chamber 110 is about 8 kPa higher than the atmospheric pressure in the constant pressure chamber 320 and higher than the specified pressure on the high pressure side, the top end 521 of the valve stem 520 crosses the first inclined surface 440 and is opposite to the first cam surface 410. Figure 3 This is the third state where the gas pressure is higher than the specified pressure on the high-pressure side.

[0090] from Figure 2 The second state and Figure 3 A comparison of the third state reveals that the clamping portion 360 has shifted further upwards, protruding entirely from the clamping guide 362. That is, not only the upper half of the clamping portion 360 protrudes from the clamping guide 362, but also the lower half. Therefore, by marking the lower half of the clamping portion 360 with a different color or marking than the upper half, it is possible to visually indicate that the gas pressure is higher than the specified pressure on the high-pressure side and the fluid on / off valve 1 is closed.

[0091] like Figure 6 As shown, the inclination angle C of the first inclined surface 440 is steeper than the inclination angle D of the second inclined surface 450. Therefore, it can move immediately towards the first cam surface 410 when the gas pressure is higher than the specified pressure on the high-pressure side. However, once it moves towards the first cam surface 410, it is difficult to return to the third cam surface 430. Conversely, the inclination angle D of the second inclined surface 450 is a gentle slope, thus allowing for easier movement in... Figure 2 The gas pressure shown is the second state of the specified operating pressure and Figure 1 The diagram shows the switching between the first state where the gas pressure is lower than the specified pressure on the low-pressure side.

[0092] like Figure 3 As shown, in the third state where the gas pressure is higher than the specified pressure on the high-pressure side and the fluid on / off valve 1 is closed, it is preferable to close the outflow passage 140 by means of the fluid switching valve 700. The switching action of the fluid switching valve 700 can be performed by the operator manually rotating the operating part 715 formed on the upper part of the valve component 710.

[0093] Figure 4With the outflow passage 140 closed, the central axis B of the valve portion 712 is displaced to its maximum extent towards the opening of the outflow passage 140. This displacement presses the sealing member 720 against the opening, causing the sealing member 720 to elastically deform and reliably block the opening. More specifically, the wall thickness of the sealing member 720 (approximately 1.5 mm) is greater than the distance between the outer periphery of the valve portion 712 and the opening (approximately 1 mm) when the central axis B of the valve portion 712 is in the state of maximum displacement. Therefore, the sealing member 720 is compressed by this difference, sealing the opening.

[0094] Furthermore, during the 90-degree rotation, the sealing member 720 presses against the inner circumference of the valve chamber 705, but only a portion of the sealing member 720 is pressed. Therefore, the load required for the rotation of the operating part 715 is not increased beyond what is necessary.

[0095] If the abnormal gas pressure is eliminated and the fluid switching valve 1 resumes its function, the fluid switching valve 700 will also open the outflow passage 140. The operator rotates the operating unit 715 90 degrees to achieve the following state: Figure 5 The central axis B of the valve section 712 is displaced upward relative to the central axis A of the valve base bottom 711 and the rotating support section 730. As a result, the sealing member 720 leaves the opening of the outflow passage 140, restoring the state of gas flow.

[0096] Furthermore, the above are preferred examples of this application, and this application has various embodiments. Figure 6 The tilt angle C of the first tilted surface 440 and the tilt angle D of the second tilted surface 450 are examples, but other angles can also be set. The set load of the diaphragm force spring 370 and the set load of the valve force spring 530 are set based on the force exerted on the diaphragm 310 by the pressure difference between the gas pressure in the diaphragm chamber 110 and the atmospheric pressure in the constant pressure chamber 320. Then, the tilt angles of the first tilted surface 440 and the second tilted surface 450 are designed according to these set loads.

[0097] In addition, such as Figure 7 As shown, a recess 421 can also be provided on the second cam surface 420. The shape of the recess 421 is a spherical shape slightly larger than the spherical shape of the tip 521 of the valve stem 520. By fitting the tip 521 of the valve stem 520 into the recess 421, it is possible to... Figure 1 The first state shown is stable. As mentioned above, the first state also includes the transport state of the fluid opening and closing valve 1, thus it can suppress the displacement of the diaphragm 310, rod 340, valve body component 500, etc. caused by vibrations during transport.

[0098] like Figure 7As shown, a protrusion 431 can also be provided on the third cam surface 430 at the position closest to the second inclined surface 450 (second direction side). By providing the protrusion 431, the low-pressure side pressure can be delayed. Therefore, it is possible to... Figure 2 The second state of the inflow passage 120 shown is stable when it is open.

[0099] Furthermore, such as Figure 7 As shown, a recess 411 can also be provided on the first cam surface 410. The shape of the recess 411 is also the same as that of the recess 421 on the second cam surface 420, and is set to be a spherical shape slightly larger than the spherical shape of the tip 521 of the valve stem 520. By fitting the tip 521 of the valve stem 520 into the recess 411, it is possible to... Figure 3 The third state of the closed inflow passage 120 shown is stable. This is because, when the gas pressure is higher than the specified pressure on the high-pressure side and the inflow passage 120 is closed, it is preferable that the closed state of the inflow passage 120 is maintained.

[0100] Figure 7 The recesses 411, 421, and 431 shown can all be formed, or any one of them can be formed. In addition, the shapes of the recesses 411 and 421 are not limited to spherical shapes, but can also be shapes with a flat bottom.

[0101] like Figure 8 As shown, the top end 521 of the valve stem 520 can also be formed as a ball 522 as a separate component. That is, a receiving portion 523 can be provided on the side of the top end 521 of the valve stem 520 to hold the ball 522. The receiving portion 523 is further preferably used to hold the ball 522 in a rotatable state. Thus, the top end 521 of the valve stem 520 can move smoothly relative to the cam structure 400.

[0102] like Figure 9 As shown, instead of the ball 522, a sliding member 524 with a rounded tip 521 can be used, which is housed in the receiving portion 523 by a sliding member force spring 525. Furthermore, since the valve stem 520 must move along the first inclined surface 440 or the second inclined surface 450 in a third direction and a fourth direction (left and right), the sliding member 524 and the sliding member force spring 525 are configured such that the tip 521 of the valve stem 520 can move smoothly relative to the cam structure 400.

[0103] like Figure 10 and Figure 11As shown, the top end 521 of the valve stem 520 can also be formed into a semi-circular arc shape. With this semi-circular arc shape, the contact point between the valve stem 520 and the cam structure 400 changes from a point to a line, making force transmission and position holding more stable. Furthermore, the shape of the valve stem 520 changes from a cylindrical shape to a quadrilateral cross-section, thus preventing rotation of the valve stem 520 while maintaining the holding passage 160.

[0104] Furthermore, an inclined surface 526 can be formed in the first direction at the tip 521 of the valve stem 520, and a protrusion 527 can be integrally formed on this inclined surface 526. When the valve stem 520 moves on the second inclined surface 450, the protrusion 527 first contacts the second inclined surface 450. Thus, the protrusion 527 functions as a guide, allowing the valve stem 520 to move smoothly on the second inclined surface 450.

[0105] In the above embodiment, the cam structure 400 is supported by cam guides at three locations: the support surface 150, the diaphragm 310, and the opening 330, for movement in the first direction and the second direction (vertical direction). However, if the movement can be adequately supported by the diaphragm 310 and the opening 330, the support surface 150 can be eliminated.

[0106] In the above embodiment, by providing the clamping part 360, the state of the fluid opening and closing valve 1 can be visually distinguished. Furthermore, by operating the clamping part 360, the operator can... Figure 2 The second state shown (inflow passage 120 open) transitions to Figure 1 The first state shown (inflow passage 120 closed) can also be reversed to the second state (inflow passage 120 open). Similarly, it is also possible to return from the first state (inflow passage 120 closed) to the second state (inflow passage 120 open). Figure 3 The third state (inflow passage 120 closed) shown in the diagram returns to the second state (inflow passage 120 open). However, when the fluid on / off valve 1 is opened and closed only through the diaphragm 310, the clamping part 360 and the clamping guide 362 can also be eliminated.

[0107] In the above embodiment, the cam structure 400 and the rod 340 are formed as separate components, but they can also be formed as a single unit. Furthermore, if the clamping portion 360 is eliminated as described above, the rod 340 can also be eliminated. In this case, the cam structure 400 is directly fixed to the diaphragm 310. Alternatively, if the rod 340 is eliminated, the cam of the cam structure 400 is guided by the support surface 150.

[0108] In the above embodiment, the fluid on / off valve 1 includes an outlet pipe 200, a flow regulating valve 600, and a fluid switching valve 700. The outlet pipe 200 is useful for changing the arrangement direction of the gas pipeline. The flow regulating valve 600 is useful for limiting the flow rate of the gas to a certain amount. In addition, the fluid switching valve 700 is also useful for cutting off the flow of gas. However, these functions are not essential for the fluid on / off valve 1 of this application and can be omitted as needed.

[0109] In the above embodiment, the pressure regulating chamber 320 is set to be open to the atmosphere and at atmospheric pressure. However, the pressure of the pressure regulating chamber 320 can also be maintained at a specified positive or negative pressure other than atmospheric pressure.

[0110] In the above embodiments, polyacetal (POM) or nylon were used as examples of resin materials, but other materials may also be used. Alternatively, metals such as zinc, iron, or aluminum alloys may be used instead of resin materials. Furthermore, the dimensions shown in the above embodiments are examples, and other sizes can certainly be specified.

[0111] In the above embodiments, an example using natural gas as the fluid is shown. The method of opening and closing the inflow passage 120 based on the pressure of the natural gas and its contact with the valve seat 130 is preferred. However, the fluid on / off valve of this application can also be used as an on / off valve for other gases, and also as an on / off valve for liquids.

Claims

1. A fluid on-off valve characterized by comprising: Possess: valve body, with diaphragm chamber, the flow into the diaphragm chamber of fluid inflow passage, the valve seat formed on the opposite side of the inflow passage with the diaphragm chamber and the flow of fluid from the diaphragm chamber outflow passage; Valve cover, forming with the diaphragm chamber across the diaphragm configuration and internal pressure of the specified pressure chamber; Cam structure, configured in the diaphragm chamber, with the diaphragm moves to the first direction and the second direction, the first direction is the displacement direction of the diaphragm to the diaphragm chamber side, the second direction is the displacement direction of the diaphragm to the constant pressure chamber side; Diaphragm force spring, to the first direction on the diaphragm force; Cam guide, support the cam structure to the first direction and the second direction of movement; And Valve body component, by moving to the third direction and the fourth direction to open and close the valve seat, the third direction and the fourth direction are orthogonal to the first direction and the second direction, the third direction is the inflow passage from the valve seat to the diaphragm chamber direction, the fourth direction is the inflow passage from the diaphragm chamber to the valve seat direction, The first cam surface formed on the end side of the first direction of the cam structure and the second cam surface formed on the end side of the second direction are more displaced to the third direction than the third cam surface formed in the middle part of the first direction and the second direction, The valve body component has: valve body, with the valve seat abutting off;And valve stem, by abutting with the cam structure, the movement of the cam structure to the first direction and the second direction is converted into displacement to the third direction and fourth direction and is transmitted to the valve body, The second cam surface and the third cam surface of the cam structure are parallel to the first direction and the second direction, the second cam surface and the third cam surface are second inclined surfaces inclined to the fourth direction more to the first direction, In the first state, the valve stem of the valve body component and the second cam surface of the cam structure abut, the valve body of the valve body component and the valve seat abut, wherein the first state is the pressure in the diaphragm chamber and the pressure of the constant pressure chamber is the same or higher than the pressure of the constant pressure chamber by the first amount, wherein the first amount is less than the low pressure side specified pressure, In the second state, the valve stem of the valve body component and the third cam surface of the cam structure abut, the valve body of the valve body component and the valve seat are separated, wherein the second state is the pressure in the diaphragm chamber is higher than the pressure of the constant pressure chamber by the second amount, wherein the second amount is greater than or equal to the low pressure side specified pressure and less than the high pressure side specified pressure, When the fluid does not flow into the diaphragm chamber or the pressure in the diaphragm chamber changes in the first state, the valve stem and the plane of the second cam surface abut, maintaining the first state, When the pressure in the diaphragm chamber changes in the second state, the valve stem and the plane of the third cam surface abut, maintaining the second state.

2. The fluid opening and closing valve according to claim 1, wherein the valve body member further includes a valve force applying spring that applies a force to the valve main body toward the valve seat side.

3. The fluid opening and closing valve according to claim 1, wherein the valve stem of the valve body member houses a ball member at the top end in the third direction.

4. The fluid opening and closing valve according to claim 1, wherein the valve stem of the valve body member houses a sliding member at the top end in the third direction in a manner that is movable in the third direction and the fourth direction, and includes a sliding member force applying spring that applies a force to the sliding member toward the third direction.

5. The fluid opening and closing valve according to claim 1, wherein the first cam surface and the third cam surface of the cam structure are planes that are parallel to the first direction and the second direction, and the third cam surface and the first cam surface are inclined surfaces that are inclined more toward the third direction as they go in the first direction, in a third state in which the pressure in the diaphragm chamber is higher than a predetermined pressure, the valve stem of the valve body member is in abutment with the first cam surface of the cam structure, and the valve main body of the valve body member is in abutment with the valve seat.

6. The fluid opening and closing valve according to claim 1, wherein the cam structure includes a first cam surface recessed portion that is recessed in the third direction on the first cam surface and houses the top end of the valve stem in the third direction.

7. The fluid opening and closing valve according to claim 1, wherein the cam structure includes a second cam surface recessed portion that is recessed in the third direction on the second cam surface and houses the top end of the valve stem in the third direction.

8. The fluid opening and closing valve according to claim 1, wherein the cam structure includes a third cam surface protruding portion that protrudes in the fourth direction on the third cam surface and hinders movement of the valve stem in the first direction and the second direction.

9. The fluid opening and closing valve according to claim 1, wherein a flow rate adjusting valve that adjusts the flow rate of fluid is disposed on the fluid flow upstream side of the valve body member in the inflow passage of the valve body, the flow rate adjusting valve includes: a passage throttling portion disposed on the fluid flow upstream side of the valve main body in the inflow passage; a ball valve disposed opposite the throttling portion on the fluid flow upstream side of the throttling portion; and a ball valve force applying spring that applies a force to the ball valve in a direction away from the throttling portion.

10. The fluid opening and closing valve according to claim 1, wherein a fluid switching valve that switches the opening and closing of fluid flow is disposed in the outflow passage of the valve body, the fluid switching valve includes a valve chamber that is cylindrical and is located in the outflow passage, and a cylindrical rotation support portion that is continuous with the valve chamber in the axial direction, includes: ​ A valve member having a valve base portion rotatably disposed on the rotary support portion and a valve portion that rotates together with the valve base portion and rotates within the valve chamber; and A seal member that rotates together with the valve portion, closes the opening portion of the outflow passage opposite the opening portion of the valve chamber, The position of the center of rotation of the seal member when rotating is eccentric with respect to the position of the center axis of the rotary support portion and the valve base portion, and the seal member is pressed against the opening portion in accordance with the rotation of the seal member.

11. The fluid opening and closing valve according to claim 1, wherein An outflow pipe is disposed downstream of the outflow passage of the valve body, the outflow pipe being held so as to be rotatable with respect to the valve body.

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