CN116412289A

CN116412289A - Fluid on-off valve

Info

Publication number: CN116412289A
Application number: CN202210145977.7A
Authority: CN
Inventors: 邵熙鹏; 森克巳
Original assignee: Dayang Giken Industry Co ltd
Current assignee: Dayang Giken Industry Co ltd
Priority date: 2021-12-29
Filing date: 2022-02-17
Publication date: 2023-07-11
Also published as: JP2023098830A

Abstract

The present utility model provides a fluid on-off valve which can reliably switch between three modes, namely, closing a passage under a state of lower than a low-pressure side specified pressure, opening a passage under an action pressure and closing a passage under a state of higher than a high-pressure side specified pressure without using a magnet. The device is provided with: a cam structure disposed in the diaphragm chamber and moving together with the diaphragm in a first direction and a second direction, the first direction being a displacement direction of the diaphragm toward the diaphragm chamber, and the second direction being a displacement direction of the diaphragm toward the constant pressure chamber; and a valve body member that opens and closes 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 from the valve seat to the diaphragm chamber of the inflow passage, and the fourth direction being a direction from the diaphragm chamber to the valve seat of the inflow passage. The movement of the diaphragm in the first direction and the second direction is converted into the movement of the valve body member in the third direction and the fourth direction by the cam structure to open and close the passage.

Description

Fluid on-off valve

Technical Field

The present utility model relates to an on-off valve which switches a flow path according to the pressure of a fluid, and is applicable to, for example, opening and closing of a gas pipe.

Background

As the opening/closing valve of the fluid, an opening/closing valve is used in which the flow path is closed in a state where the fluid pressure is lower than the low-pressure side predetermined pressure, the flow path is opened in a state where the operating pressure is between the low-pressure side predetermined pressure and the high-pressure side predetermined pressure, and the flow path is closed when the fluid pressure is higher than the high-pressure side predetermined pressure. In the fluid on-off valve described in patent document 1, in order to switch and maintain three states of closing, opening, and closing, a diaphragm that is displaced according to pressure and a magnet that holds the position of the diaphragm are used.

Prior art literature

Patent literature

Patent document 1: utility model patent publication CN213745105U gazette

Disclosure of Invention

Technical problem to be solved by the utility model

However, when the ambient temperature is too high, the magnetic force of the magnet may be lowered, and it may be difficult to maintain a predetermined state. Therefore, even in a state where the flow path is required to be closed to shut off the gas flow, the flow path may not be maintained closed, and the gas may flow.

In view of the above, the present utility model has an object to maintain a state in which a valve body member opens and closes a flow path by displacement of a diaphragm without using a magnet.

Solution for solving the technical problems

The first embodiment of the present application is provided with: a valve body including a diaphragm chamber, an inflow passage through which a fluid flows into the diaphragm chamber, a valve seat formed on an opposite side surface of the inflow passage from the diaphragm chamber, and an outflow passage through which the fluid flows out of the diaphragm chamber; a valve cover forming a constant pressure chamber which is arranged with the diaphragm chamber through the diaphragm and keeps a predetermined pressure inside; a cam structure disposed in the diaphragm chamber and moving together with the diaphragm in a first direction in which the diaphragm is displaced toward the diaphragm chamber, and in a second direction in which the diaphragm is displaced toward the constant pressure chamber; a diaphragm urging spring that urges the diaphragm in a first direction; a cam guide for supporting movement of the cam structure in a first direction and a second direction; and a valve body member that opens and closes 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 from the valve seat to the diaphragm chamber of the inflow passage, and the fourth direction being a direction from the diaphragm chamber to the valve seat of the inflow passage.

The first cam structure of the present application has a shape in which a first cam surface formed on an end side in the first direction and a second cam surface formed on an end side in the second direction are displaced in the third direction than a third cam surface formed on an intermediate portion in the first direction and the second direction. The first valve body member of the present application includes: a valve body which is abutted and separated from the valve seat; and a valve rod which, by abutting against the cam structure, converts movement of the cam structure in the first direction and the second direction into displacement in the third direction and the fourth direction, and transmits the displacement to the valve body.

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, the position of the valve body member can be maintained at the first cam surface position, the second cam surface position, and the third cam surface position without the need for a member such as a magnet.

The position of the second cam surface is located on the second direction end side of the cam structure, and therefore the diaphragm is in a state of being 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. In this state, the valve stem is displaced in the third direction, and the valve body abuts against the valve seat to close the inflow passage.

The position of the third cam surface is located at a middle portion of the cam structure in the first direction and the second direction, and therefore the diaphragm is displaced from the end side in the first direction (the position of the second cam surface) in the second direction. That is, the pressure in the diaphragm chamber is set to an operating pressure intermediate between the low-pressure side predetermined pressure and the high-pressure side predetermined pressure. In this state, the valve stem is displaced in the fourth direction, and the valve body is separated from the valve seat, thereby opening the inflow passage. This enables the fluid of the operating pressure to flow.

The position of the first cam surface is located on the end side of the cam structure in the first direction, and therefore the diaphragm is in a state of being maximally displaced in the second direction. This corresponds to a state in which the pressure in the diaphragm chamber is higher than the high-pressure side prescribed pressure with respect to the pressure in the prescribed pressure chamber. In this state, the valve stem is displaced in a third direction because high-pressure fluid flow is not desired. Thereby, the valve body is in contact with the valve seat, and closes the inflow passage.

In the second embodiment of the present application, the valve body member further includes a valve biasing spring that biases the valve body toward the valve seat. By disposing the valve biasing spring, the operation of the valve body member can be stabilized.

In a third embodiment of the present application, the valve stem of the valve body member rotatably houses the ball member at the third directional tip. By disposing the ball member, the valve rod can easily slide with respect to the cam structure. Thus, movement of the valve stem between the second cam surface and the third cam surface and movement between the third cam surface and the second cam surface are smoother.

In a fourth embodiment of the present application, a valve rod of a valve body member houses a sliding member at a third-direction tip so as to be movable in a third direction and a fourth direction, and includes a sliding member biasing spring that biases the sliding member in the third direction. The slide member can be moved smoothly with respect to the cam structure. Further, since the movement amounts of the slide member in the third direction and the fourth direction are 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, the valve rod can be displaced in the third direction and the fourth direction with respect to the cam structure.

In a 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. The second cam surface and the third cam surface are inclined surfaces inclined in the fourth direction as going toward the first direction, and the third cam surface and the first cam surface are inclined surfaces inclined in the third direction as going toward the first direction.

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, the valve body member can maintain its position even if the diaphragm is displaced in the first direction and the second direction due to a slight variation in fluid pressure in a state where the valve stem is engaged with the first cam surface, the second cam surface, and the third cam surface. This stabilizes the opening and closing of the valve body to the valve seat.

In a sixth embodiment of the present application, the cam structure includes a first cam surface recess recessed in the first cam surface in the third direction, and accommodates the third-direction tip of the valve stem. As described above, the valve stem is in contact with the first cam surface in a state in which the pressure in the diaphragm chamber is higher than the high-pressure side predetermined pressure. 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 main body can be reliably maintained.

In a seventh embodiment of the present application, the cam structure includes a second cam surface recess recessed in the third direction on the second cam surface, and accommodates the third-direction tip of the valve stem. The valve rod is in contact with the second cam surface in a state in which the pressure in the diaphragm chamber is lower than the low-pressure side predetermined pressure. This state also includes a state in which the fluid opening and closing valve is not connected to the flow path. That is, the state when the fluid on-off valve is transported is also included, and it is preferable that 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 main body can be reliably maintained.

In an eighth embodiment of the present application, the cam structure includes a third cam surface protrusion that bulges in the fourth direction on the third cam surface to block movement of the valve rod in the first direction and the second direction. The valve stem abutting against the third cam surface is in a state where the fluid is at a predetermined operating pressure, and in this state, the valve body is preferably separated from the valve seat as much as possible to open the inflow passage. Therefore, by providing the third cam surface convex portion, unnecessary movement of the valve stem to the second cam surface side and the first cam surface side is restricted.

In a ninth embodiment of the present application, a flow rate regulating valve for regulating the flow rate of a fluid is disposed on the upstream side of a fluid flow of a valve body member of an inflow passage of a valve body. The flow rate control valve further includes: a throttle unit disposed on the upstream side of the fluid flow flowing into the valve body in the passage; a ball valve disposed opposite to the throttle portion on an upstream side of the throttle portion with respect to the fluid flow; and a ball valve biasing spring that biases the ball valve in a direction away from the throttle portion.

If the fluid flow rate increases beyond the urging force of the ball valve urging spring, the ball valve is displaced toward the throttle portion side. As a result, the flow path of the fluid is throttled by the ball valve and the throttle portion, and the flow resistance increases, thereby restricting the flow rate. Conversely, if the flow rate is below the proper value, the ball valve is unseated from the restriction by the force of the ball valve apply spring. As a result, the flow resistance between the ball valve and the throttle portion decreases, and the flow rate increases. The flow rate control valve operates in conjunction with downstream fluid opening and closing. For example, even if the fluid flow rate varies, the operation of the downstream fluid on-off valve can be stabilized by using the flow rate regulating valve.

In a tenth embodiment of the present application, a fluid switching valve for switching a flow of a fluid is disposed in an outflow passage of a valve body. The fluid switching valve is formed with a valve body: a valve chamber having a cylindrical shape and located in the outflow passage; and a cylindrical rotation support portion that is continuous with the valve chamber in the axial direction. The present utility model further includes: a valve member having a valve base portion rotatably disposed on the rotation support portion and a valve portion integrally rotated with the valve base portion and rotated in the valve chamber; and a sealing member that rotates integrally with the valve portion and closes the opening portion so as to face the opening portion of the outflow passage toward the valve chamber.

In the fluid switching valve according to the tenth embodiment of the present application, the rotation center axis position at the time of rotation of the seal member is eccentric with respect to the center axis position of the valve chamber, and the seal member is pressed against the opening portion by rotation of the seal member.

In the tenth embodiment of the present application, the rotation center axis position at the time of rotation of the seal member is eccentric with respect to the center axis position 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 displacement seal member can be pressed against either the fluid inlet passage or the fluid outlet passage. By pressing the seal member, the seal member can reliably seal any one of the fluid inlet passage and the fluid outlet passage.

In an eleventh embodiment of the present application, an outflow pipe is disposed downstream of the outflow passage of the valve body. The outflow pipe is rotatably held with respect to the valve body. This allows the direction of installation of the tube connected to the outflow tube to be freely set.

Drawings

Fig. 1 is a sectional view of a first state of the fluid on-off valve.

Fig. 2 is a sectional view of the second state of the fluid on-off valve.

Fig. 3 is a sectional view of the third state of the fluid on-off valve.

FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. 1.

Fig. 5 is a cross-sectional view showing a state in which the valve portion is rotated 90 degrees from the state of fig. 4.

Fig. 6 is a cross-sectional view of the cam structure.

Fig. 7 is a cross-sectional view of another embodiment of a cam structure.

FIG. 8 is a cross-sectional view of another embodiment of a valve stem.

FIG. 9 is a cross-sectional view of yet another embodiment of a valve stem.

FIG. 10 is a cross-sectional view of yet another embodiment of a valve stem.

FIG. 11 is a cross-sectional view of yet another embodiment of a valve stem.

Description of the reference numerals

1: fluid on-off valve

100: valve body

110: diaphragm chamber

120: inflow passage

130: valve seat

140: outflow passage

300: valve cover

310: diaphragm

400: cam structure

410: first cam surface

420: second cam surface

430: a third cam surface

500: valve body component

Detailed Description

In fig. 1 to 3, 1 is a fluid on-off valve. 100 is a valve body formed by die casting of aluminum or an aluminum alloy. The valve body 100 is formed with a cylindrical diaphragm chamber 110 having a maximum diameter of about 50 to 60 mm. The valve body 100 is further provided with an inflow passage 120 for allowing fluid to flow into the diaphragm chamber 110. In this example, a fuel gas was used as the fluid. The inflow passage 120 is connected to a gas introduction pipe of a gas company or the like. The inner diameter of the inflow passage 120 is about 5 to 10 mm.

A valve seat 130 is formed on the valve body 100 on the opposite side of the inflow passage 120 from the diaphragm chamber 110. The valve body 100 is further provided with an outflow passage 140 through which fluid flows out of the diaphragm chamber 110. The inner diameter of the outflow passage 140 is also about 5 to 10 mm. An outflow pipe 200 made of a resin such as polyacetal POM or nylon is disposed downstream of the outflow passage 140.

The outflow pipe 200 is sealed with the outflow passage 140 of the valve body 100 by an O-ring 210. The outflow pipe 200 and the outflow passage 140 of the valve body 100 are stopped by the clip spring 220. In addition, the outflow tube 200 may be rotated 360 degrees with respect to the valve body 100. The outflow pipe 200 is connected to a gas pipe that connects a gas appliance such as a household gas range to the fluid on-off valve 1. Accordingly, the gas pipe retaining structure 230 is formed on the outer periphery of the outflow pipe 200.

A valve cover 300 made of aluminum or an aluminum alloy is disposed opposite to the diaphragm chamber 110 of the valve body 100. The outer periphery of the diaphragm 310 made of nitrile rubber is sandwiched between the valve cover 300 and the valve body 100. Thus, the diaphragm 310 encloses the diaphragm chamber 110. In addition, a diaphragm 310 separates the valve housing 300 from the diaphragm chamber 110. A constant pressure chamber 320 is formed between the inside of the valve housing 300 and the diaphragm 310. Since the constant pressure chamber 320 communicates with the atmosphere through the cylindrical opening 330, the constant pressure chamber 320 is at atmospheric pressure.

A rod 340 made of metal is disposed on the inner peripheral portion of the diaphragm 310. The rod 340 is formed of stainless steel, iron, aluminum alloy, or the like. The rod 340 has a cylindrical shape with a diameter of about 5 mm and a length of about 30 mm.

A disk-shaped holding plate 350 made of a resin such as polyacetal POM or nylon is disposed on the inner peripheral portion of the diaphragm 310. The inner peripheral portion of the diaphragm 310 is sandwiched between the nut 342 and the flange portion 341 formed on the rod 340 together with the holding plate 350. The upper portion of the lever 340 is slidably supported by the opening 330 of the valve housing 300. That is, the lower portion of the lever 340 is held by the inner peripheral portion of the diaphragm 310, and the upper portion is held by the opening 330.

A shoulder 343 is formed on the upper portion of the lever 340, and the pinch portion 360 is engaged with the shoulder 343. The pinch portion 360 is made of a resin such as polyacetal POM or nylon, and is substantially cylindrical, and a disk-shaped connecting portion 361 is provided in the cylindrical intermediate portion Zhou Dengzai. In the pinch portion 360, the coupling portion 361 is locked to the shoulder portion 343 of the lever 340, and is fastened and fixed by the nut 344 in this state.

A cylindrical pinch guide 362 having an inner diameter slightly larger than the outer diameter of the pinch portion 360 is disposed on the outer periphery of the pinch portion 360. The pinch guide 362 is also made of a resin such as polyacetal POM or nylon. The lower end of the pinch guide 362 is formed with a locking portion 363 bent in an inward direction, and is held on the upper surface of the valve housing 300 by the locking portion 363. That is, in the valve housing 300, the spring holder 365 is fixed by the clip spring 366, and the pinching guide 362 is pressed against the valve housing 300 by the pinching guide fixing spring 364 interposed between the spring holder 365 and the locking portion 363. Thus, even in a state where the pinch portion 360 is maximally displaced in the first direction, the pinch guide 362 can be effectively restrained from shaking. However, the pinch guide 362 may be welded directly to the valve housing 300.

A diaphragm biasing spring 370 that presses the diaphragm 310 toward the diaphragm chamber 110 is disposed in the constant pressure chamber 320. The diaphragm urging spring 370 is made of spring steel, and has one end abutting against the holding plate 350 and the other end abutting against an abutment surface 301 formed on the valve housing 300.

A cam structure 400 is disposed at the lower end of the lever 340. The cam structure 400 is made of polyacetal POM, nylon, or other resin, and is welded to the lower end of the lever 340. In this example, the diaphragm 310, the lever 340, and the cam structure 400 are displaced in the up-down direction of fig. 1 to 3 according to the pressure difference between the diaphragm chamber 110 and the constant pressure chamber 320. However, the arrangement state of the fluid opening/closing valve 1 in the drawing is an example, and the lever 340 and the like are not limited to up-and-down movement. Therefore, the lower direction in the drawing is referred to as a first direction, and the upper direction is referred to as a second direction. The first direction is a direction in which the diaphragm 310 and the like are displaced toward the diaphragm chamber 110. The second direction is a direction in which the diaphragm 310 and the like are displaced toward the constant pressure chamber 320.

The right direction of the left and right directions orthogonal to the first direction and the second direction is set as a third direction, and the left direction is set as a fourth direction. The third direction is a direction in which the fluid flowing into the passage 120 from the valve seat 130 to the diaphragm chamber 110 flows and a direction in which the valve seat 130 is closed. The fourth direction is a direction from the diaphragm chamber 110 to the valve seat 130 in the inflow passage 120 and a direction to open the valve seat 130.

A first cam surface 410 is formed on the end side of the cam structure 400 in the first direction (lower side). The first cam surface 410 is substantially flat in the first direction and the second direction (up-down direction). A second cam surface 420 is also formed on the second-direction (upper-side) end side of the cam structure 400. The second cam surface 420 is also substantially flat in the first direction and the second direction (up-down direction). The first cam surface 410 and the second cam surface 420 are formed at substantially the same position in the third direction and the fourth direction (left-right direction).

A third cam surface 430 is formed in the middle of the cam structure 400 in the first direction and the second direction (up-down direction). The third cam surface 430 is also substantially flat in the first direction and the second direction (up-down direction). Further, the third cam surface 430 is located at a position in the fourth direction (left side) compared to the first cam surface 410 and the second cam surface 420. In other words, the first cam surface 410 and the second cam surface 420 are located farther from the direction of the valve seat 130 (third direction) than the third cam surface 430.

An inclined surface (first inclined surface 440) inclined in the third direction (right side) as going toward the first direction (downward) is formed between the third cam surface 430 of the cam structure 400 and the first cam surface 410. Further, an inclined surface (second inclined surface 450) inclined in the fourth direction (left side) as going toward the first direction (downward) is formed between the second cam surface 420 and the third cam surface 430.

The structure bottom surface 460 of the cam structure 400 in the third direction (right side) opposite to the surface on which the first to third cam surfaces 410, 420, 430 are formed is flat in the first direction and the second direction (up-down direction). The bottom surface 460 of the structure is supported by the support surface 150 formed on the valve body 100. That is, the cam structure 400 slides along the support surface 150 in the first direction and the second direction (up-down direction). Therefore, the support surface 150 is also a cam guide for supporting the movement of the cam structure 400 in the first direction and the second direction (up-down direction). However, the lever 340 also supports the movement of the cam structure 400 in the first direction and the second direction (up-down direction). As described above, since the movement of the lever 340 is such that the lower portion is held by the inner peripheral portion of the diaphragm 310 and the upper portion is held by the opening 330, the diaphragm 310 and the opening 330 are also cam guides for supporting the movement of the cam structure 400 in the first direction and the second direction (up-down direction).

A valve body member 500 is disposed in contact with the cam structure 400. The valve body 500 is made of polyacetal POM, nylon, or other resin, and integrally formed with a valve body 510 and a valve stem 520, wherein the valve body 510 is brought into contact with and separated from the valve seat 130, and the valve stem 520 is brought into contact with the cam structure 400.

The valve stem 520 is held by a holding passage 160 formed in the valve body 100 in a state of being movable in the third direction and the fourth direction (left-right direction). The tip 521 of the valve rod 520 has a spherical shape and can smoothly move 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.

A rubber seal 511 is bonded to a surface of the valve body 510 that abuts against the valve seat 130, and when the valve body 510 is seated on the valve seat 130, the inflow passage 120 is reliably closed. Further, the valve body 510 is pressed against the valve seat 130 side by the urging force of the valve urging spring 530, and the valve urging spring 530 ensures sealing when the valve body 510 sits on the valve seat 130.

A flow rate control valve 600 is disposed upstream of the valve body member 500 of the inflow passage 120. One end of the valve biasing spring 530 is locked to the passage restriction portion 610 of the flow rate adjustment valve 600. The other end of the valve biasing spring 530 abuts against the valve body 510.

A ball valve 620 is disposed in the flow rate control valve 600 so as to face the passage throttle 610, and a ball valve biasing spring 630 that biases the ball valve 620 in a direction away from the passage throttle 610 is disposed between the ball valve 620 and the passage throttle 610. The ball valve 620 and the ball valve biasing spring 630 are disposed within the flow regulating valve housing 640. The flow rate adjustment valve housing 640 has a plurality of passage holes 641 formed therein, and the flow rate adjustment valve housing 640 does not throttle the inflow passage 120. The passage restriction portion 610, the ball valve 620, and the flow rate adjustment valve housing 640 are made of a resin such as polyacetal POM or nylon. Further, the passage throttle 610 is bonded to the flow rate adjusting valve housing 640.

A fluid switching valve 700 for switching the opening and closing of the passage is disposed in the outflow passage 140. The fluid switching valve 700 includes a valve member 710 and a sealing member 720. As shown in fig. 4 and 5, a valve chamber 705 is formed so as to intersect the outflow path 140 arranged in a straight line. A valve member 710 and a sealing member 720 are disposed in the valve chamber 705.

The valve body 100 is formed with a rotation support portion 730 having a circular cross section. The inner diameter of the rotation support portion 730 is about 15 mm. A valve chamber 705, which is opened to the outflow path 140, is formed below the rotation support part 730. The rotation support portion 730 and the valve chamber 705 have a continuous constant diameter cylindrical shape.

The valve member 710 is made of a resin such as polyacetal POM or nylon, and includes: a valve base 711 fitted to the rotation support 730 and rotated; and a valve portion 712 integrally formed below the valve base portion 711 and rotatable in the valve chamber 705. The valve base portion 711 and the valve portion 712 are each cylindrical, and the outer diameter of the valve base portion 711 is substantially the same as the inner diameter of the rotation support portion 730.

An O-ring retaining groove is formed in the valve base 711, and a valve O-ring 713 is retained. The valve O-ring 713 is in close contact with the inner periphery of the rotation support portion 730, and prevents fluid from leaking from the valve chamber 705.

The outer diameter of the valve portion 712 is about 10 mm, and the center axis B of the valve portion 712 is eccentric from the center axis a of the valve base portion 711 and the rotation support portion 730 by about 1 mm. Thus, the valve portion 712 eccentrically rotates in the valve chamber 705.

An annular seal member 720 made of rubber is disposed at a position facing the outflow passage 140 in the outer periphery of the valve portion 712. Further, a knurled groove is formed in a portion of the outer periphery of the valve portion 712 where the seal member 720 is disposed, and the seal member 720 is reliably held in the valve portion 712.

Next, the operation of the fluid opening/closing valve 1 having the above-described structure will be described. In the normal operation, the fluid switching valve 700 opens the outflow passage 140 in the state of fig. 5. The state of fig. 1 is a state before the fluid opening and closing valve 1 is connected to the gas pipe and a first state in which the fluid opening and closing valve 1 is connected to the gas pipe but the pressure of the gas is higher than the atmospheric pressure by less than 1 kpa. In the first state of fig. 1, the diaphragm urging spring 370 displaces the diaphragm 310 toward the diaphragm chamber 110 side (first direction). Accordingly, the tip 521 of the valve rod 520 abuts the second cam surface 420.

The state of the valve body member 500 is maintained by the pressing force of the valve biasing spring 530. Therefore, even in a state of single transportation before the fluid opening and closing valve 1 is connected to the pipe, the movement of the stem 340 and the valve body member 500 and the like is effectively suppressed by the urging forces of the diaphragm urging spring 370 and the valve urging spring 530.

When the fluid on-off valve 1 is connected to the gas line and the pressure in the diaphragm chamber 110 exceeds the atmospheric pressure by about 1 kpa or more, the diaphragm 310 is displaced toward the constant pressure chamber 320 (second direction) against the biasing force of the diaphragm biasing spring 370. With this displacement, the cam structure 400 also moves in the second direction. In response to the movement of the cam structure 400, the tip 521 of the valve stem 520 abuts against the second inclined surface 450, and moves in a direction (fourth direction) to separate the valve body 510 from the valve seat 130.

Fig. 2 shows a second state in which the tip 521 of the valve rod 520 abuts against the third cam surface 430 via the second inclined surface 450. In the second state of fig. 2, the sealing member 511 of the valve body 510 is disengaged from the valve seat 130, and the inflow passage 120 is opened. In this state, the flow rate of the fuel gas is regulated by the flow rate regulating valve 600.

The ball valve biasing spring 630 presses the ball valve 620 of the flow rate adjustment valve 600 toward the flow rate adjustment valve housing 640. Therefore, the normal passage throttle 610 can flow a predetermined amount of fuel gas without throttling. However, when the flow rate of the gas exceeds the predetermined amount, the ball valve 620 is displaced toward the passage restriction portion 610 against the urging force of the ball valve urging spring 630. Then, the ball valve 620 and the passage restriction portion 610 restrict the flow path of the fuel gas, and restrict the flow rate of the fuel gas. The flow rate of the fuel gas is regulated to a predetermined amount by cooperation of the ball valve 620, the passage restriction portion 610, and the ball valve biasing spring 630. In particular, in the present embodiment, the operation of the flow rate control 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 flow of the gas rises from zero flow at once. In the second state, the gas flow rate may also increase rapidly. In this case, since the flow rate control valve 600 is provided, the operation of the fluid on-off valve 1 disposed downstream can be stabilized.

Since the third cam surface 430 is located at a predetermined distance, the second state shown in fig. 2 can be maintained even when the cam structure 400 moves in the first direction due to the pressure in the diaphragm chamber 110 rising to 1 kpa or more above the atmospheric pressure. The second state is a state in which 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.

That is, the predetermined operating pressure of the fuel gas is about 0.8 to 8 kpa higher than the atmospheric pressure. When the pressure is lower than the low pressure side predetermined pressure, that is, 0.8 kpa, the tip 521 of the valve stem 520 contacts the first cam surface 410 beyond the second inclined surface 450. I.e. to the first state shown in fig. 1.

As can be seen from a comparison of the second state (fig. 2) with the first state (fig. 1), the upper portion of the pinch portion 360 protrudes from the pinch guide 362 by about half. By marking the upper half of the pinch portion 360 with a predetermined color or a mark, the state in which the fluid opening/closing valve 1 operates at a predetermined operating pressure can be visually represented.

When the gas pressure in the diaphragm chamber 110 is about 8 kpa or more higher than the atmospheric pressure in the constant pressure chamber 320 and higher than the high pressure side predetermined pressure, the tip 521 of the valve rod 520 faces the first cam surface 410 across the first inclined surface 440. Fig. 3 is a third state in which the gas pressure is higher than the high-pressure side predetermined pressure.

As can be seen from a comparison of the second state of fig. 2 with the third state of fig. 3, the pinch portion 360 is displaced further upward, all of which protrude from the pinch guide 362. That is, not only the upper half of the pinch portion 360 is exposed from the pinch guide 362, but also the lower half is exposed from the pinch guide 362. Therefore, by marking the lower half of the pinch portion 360 with a predetermined color or mark different from the upper half, it is possible to visually indicate a state in which the gas pressure is higher than the high-pressure side predetermined pressure and the fluid opening/closing valve 1 is closed.

As shown in fig. 6, the inclination angle C of the first inclined surface 440 is steeper than the inclination angle D of the second inclined surface 450. This makes it possible to immediately move toward the first cam surface 410 when the gas pressure is higher than the high-pressure side predetermined pressure. Further, once the cam surface moves toward the first cam surface 410, it is difficult to return to the third cam surface 430. In contrast, since the inclination angle D of the second inclined surface 450 is a gentle slope, it is possible to relatively easily switch between the second state in which the gas pressure is a predetermined operating pressure shown in fig. 2 and the first state in which the gas pressure is lower than the low-pressure side predetermined pressure shown in fig. 1.

As shown in fig. 3, in the third state in which the fuel gas pressure is higher than the high-pressure side predetermined pressure and the fluid opening/closing valve 1 is closed, the outflow passage 140 is preferably closed by the fluid switching valve 700. The switching operation of the fluid switching valve 700 can be performed by a worker manually rotating the operation portion 715 formed on the upper portion of the valve member 710.

Fig. 4 shows a state where the outflow passage 140 is closed, and the central axis B of the valve portion 712 is displaced to the maximum extent toward the opening side of the outflow passage 140. By this displacement, the sealing member 720 is pressed against the opening, and the sealing member 720 is elastically deformed, thereby reliably closing the opening. More specifically, the wall thickness (about 1.5 mm) of the sealing member 720 is larger than the distance (about 1 mm) between the outer periphery of the valve portion 712 and the opening portion in the state where the central axis B of the valve portion 712 is maximally displaced, and therefore the sealing member 720 is pressed by the difference to seal the opening portion.

Further, the sealing member 720 is pressed against the inner circumference of the valve chamber 705 during the 90-degree rotation action, but only a part of the sealing member 720 is pressed. Therefore, the load required for the rotation of the operation portion 715 is not raised more than necessary.

If the abnormal state of the fuel gas pressure is eliminated and the fluid on-off valve 1 resumes its function, the fluid switching valve 700 opens the outflow passage 140. The operator turns the operation unit 715 by 90 degrees, as shown in fig. 5, and the central axis B of the valve unit 712 is displaced upward in the figure with respect to the central axes a of the valve base unit 711 and the rotation support unit 730. As a result, the sealing member 720 is separated from the opening of the outflow path 140, and the gas circulation state is restored.

Further, what has been described above is a preferable example of the present application, and various modes are available in the present application. The inclination angle C of the first inclined surface 440 and the inclination angle D of the second inclined surface 450 in fig. 6 are examples, and other angles may be set. The set load of the diaphragm urging spring 370 and the set load of the valve urging spring 530 are set based on the force applied to the diaphragm 310 by the differential pressure between the gas pressure in the diaphragm chamber 110 and the atmospheric pressure of the constant pressure chamber 320. Then, the inclination angles of the first inclined surface 440 and the second inclined surface 450 are designed according to these set loads.

As shown in fig. 7, a recess 421 may be provided in the second cam surface 420. The shape of the recess 421 is a sphere slightly larger than the sphere of the tip 521 of the valve stem 520. By fitting the distal end 521 of the valve stem 520 into the concave portion 421, the first state shown in fig. 1 can be stabilized. As described above, the first state also includes the transport state of the fluid opening/closing valve 1, and therefore displacement of the diaphragm 310, the rod 340, the valve body member 500, and the like due to vibration and the like during transport can be suppressed.

As shown in fig. 7, a protrusion 431 may be provided at a position of the third cam surface 430 closest to the second inclined surface 450 side (second direction side). By providing the protrusion 431, hysteresis can be generated in the low-pressure side predetermined pressure. This stabilizes the second state in which the inflow passage 120 shown in fig. 2 is opened.

Further, as shown in fig. 7, a recess 411 may be provided in the first cam surface 410. The shape of the recess 411 is also slightly larger than the spherical shape of the tip 521 of the valve rod 520, as is the case with the recess 421 of the second cam surface 420. By fitting the distal end 521 of the valve stem 520 into the recess 411, the third state of closing the inflow passage 120 shown in fig. 3 can be stabilized. This is because, when the inflow passage 120 is closed due to the gas pressure being higher than the high-pressure side predetermined pressure, it is preferable that the closed state of the inflow passage 120 is maintained.

The concave 411, the concave 421, and the convex 431 shown in fig. 7 may be formed all or any of them. The shape of the

concave portions

411 and 421 is not limited to the spherical shape, and may be a shape having a flat bottom.

As shown in fig. 8, the tip 521 of the valve stem 520 may also be formed as a ball 522 as a separate component. That is, a receiving portion 523 may be provided on the distal end 521 side of the valve rod 520, and the ball 522 may be held by the receiving portion 523. The receiving portion 523 further preferably rotatably holds the ball 522. Thus, the distal end 521 of the valve rod 520 can smoothly move with respect to the cam structure 400.

As shown in fig. 9, instead of the ball 522, a slide member 524 having a rounded distal end 521 may be accommodated in the accommodating portion 523 by a slide member urging spring 525. Since the valve rod 520 must be moved in the third direction and the fourth direction (left-right direction) along the first inclined surface 440 or the second inclined surface 450, the slide member 524 and the slide member biasing spring 525 are set so that the tip 521 of the valve rod 520 can smoothly move with respect to the cam structure 400.

As shown in fig. 10 and 11, the tip 521 of the valve rod 520 may be formed in a semicircular arc shape. In the case of forming the semicircular arc, the contact portion between the valve rod 520 and the cam structure 400 changes from a point to a line, and the force transmission and holding position is more stable. Further, since the valve stem 520 has a cross-sectional square shape from a cylindrical shape, the valve stem 520 can be prevented from rotating while being held in the holding passage 160.

Further, an inclined surface 526 may be formed in the first direction of the distal end 521 of the valve stem 520, and a protrusion 527 may be integrally formed on the 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, and the valve rod 520 can smoothly move on the second inclined surface 450.

In the above embodiment, the cam structure 400 is supported by the cam guides at three positions, i.e., the support surface 150, the diaphragm 310, and the opening 330, so as to move in the first direction and the second direction (up-down direction). However, the support surface 150 can be omitted if the diaphragm 310 and the opening 330 can sufficiently support and move.

In the above embodiment, by providing the pinch portion 360, it is visually possible to distinguish what state the fluid opening/closing valve 1 is. Further, the operator can change from the second state (the inflow passage 120 is opened) shown in fig. 2 to the first state (the inflow passage 120 is closed) shown in fig. 1 by operating the pinching portion 360, and can return from the first state (the inflow passage 120 is closed) to the second state (the inflow passage 120 is opened) in contrast. Similarly, the flow path can be restored from the third state (the flow path 120 is closed) shown in fig. 3 to the second state (the flow path 120 is opened). However, even when the fluid on-off valve 1 is opened and closed only by the diaphragm 310, the pinch portion 360 and the pinch guide 362 can be omitted.

In the above embodiment, the cam structure 400 and the lever 340 are formed as separate members, but may be formed as one body. Further, in the case where the pinch portion 360 is eliminated as described above, the lever 340 can be eliminated as well. In this case, the cam structure 400 is directly fixed to the diaphragm 310. In addition, when the lever 340 is omitted, the cam guide for supporting the cam structure 400 is performed by the support surface 150.

In the above embodiment, the fluid on-off valve 1 includes the outflow pipe 200, the flow rate adjustment valve 600, and the fluid switching valve 700. The outflow pipe 200 is useful in that it can change the arrangement direction of the gas pipe. The flow rate control valve 600 can be useful for restricting the flow rate of the fuel gas to a certain amount. The fluid switching valve 700 is also useful in cutting off the flow of fuel gas. However, these functions are not essential to the fluid on-off valve 1 of the present application, and can be omitted as needed.

In the above embodiment, the constant pressure chamber 320 is set to be open to the atmosphere and to be at the atmospheric pressure. However, the pressure in the constant pressure chamber 320 may be maintained at a predetermined positive pressure or negative pressure other than the atmospheric pressure.

In the above embodiment, polyacetal POM or nylon is exemplified as the resin material, but other materials may be used. Instead of the resin material, a metal such as zinc, iron, or aluminum alloy may be used. The dimensions shown in the above embodiments are examples, and of course, other dimensions can be set.

In the above embodiment, an example in which gas is used as the fluid is shown. A use method of opening and closing the inflow passage 120 according to the pressure of the fuel gas coming into contact with and out of contact with the valve seat 130 is a preferable application. However, the fluid on-off valve of the present application can be used as an on-off valve for other gases, and can also be used as an on-off valve for liquids.

Claims

1. A fluid on-off valve, characterized by comprising:

a valve body including a diaphragm chamber, an inflow passage through which a fluid flows into the diaphragm chamber, a valve seat formed on an opposite side surface of the inflow passage from the diaphragm chamber, and an outflow passage through which the fluid flows out of the diaphragm chamber;

a valve cover forming a constant pressure chamber which is arranged with the diaphragm chamber through the diaphragm and keeps a predetermined pressure inside;

a cam structure disposed in the diaphragm chamber and configured to move together with the diaphragm in a first direction and a second direction, the first direction being a displacement direction of the diaphragm toward the diaphragm chamber, and the second direction being a displacement direction of the diaphragm toward the constant pressure chamber;

a diaphragm urging spring that urges the diaphragm in the first direction;

a cam guide that supports movement of the cam structure in the first direction and the second direction; and

a valve body member that opens and closes 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 from the valve seat to the diaphragm chamber of the inflow passage, the fourth direction being a direction from the diaphragm chamber to the valve seat of the inflow passage,

the first cam surface formed on the end side in the first direction and the second cam surface formed on the end side in the second direction of the cam structure are displaced in the third direction more than the third cam surface formed on the intermediate portion in the first direction and the second direction,

the valve body member includes: a valve body which is in contact with and separated from the valve seat; and a valve stem that, by abutting against the cam structure, converts movement of the cam structure in the first direction and the second direction into displacement in the third direction and the fourth direction, and transmits the displacement to the valve body.

2. The fluid on-off valve according to claim 1, wherein,

the valve body member further includes a valve biasing spring that biases the valve body toward the valve seat.

3. The fluid on-off valve according to claim 1, wherein,

the valve rod of the valve body member accommodates a ball member at a tip end in the third direction.

4. The fluid on-off valve according to claim 1, wherein,

the valve rod of the valve body member accommodates a sliding member at a tip end in the third direction so as to be movable in the third direction and the fourth direction, and includes a sliding member biasing spring that biases the sliding member in the third direction.

5. The fluid on-off valve according to claim 1, wherein,

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, an inclined surface inclined in the fourth direction as the second cam surface and the third cam surface are inclined in the first direction, and an inclined surface inclined in the third direction as the third cam surface and the first cam surface are inclined.

6. The fluid on-off valve according to claim 1, wherein,

the cam structure includes a first cam surface recess recessed in the third direction on the first cam surface, and accommodates a tip of the valve rod in the third direction.

7. The fluid on-off valve according to claim 1, wherein,

the cam structure includes a second cam surface recess recessed in the third direction on the second cam surface, and accommodates a tip of the valve rod in the third direction.

8. The fluid on-off valve according to claim 1, wherein,

the cam structure includes a third cam surface protrusion that bulges in the fourth direction on the third cam surface to block movement of the valve stem in the first direction and the second direction.

9. The fluid on-off valve according to claim 1, wherein,

a flow rate regulating valve for regulating the flow rate of the fluid is disposed on the upstream side of the valve body member of the inflow passage of the valve body,

the flow rate regulating valve includes:

a passage restriction portion disposed on an upstream side of a fluid flow of the valve body in the inflow passage;

a ball valve disposed opposite to the throttle portion on an upstream side of the throttle portion in fluid flow; and

and a ball valve biasing spring for biasing the ball valve in a direction away from the throttle portion.

10. The fluid on-off valve according to claim 1, wherein,

a fluid switching valve for switching a flow of a fluid is disposed in the outflow passage of the valve body,

the fluid switching valve is formed with: a valve chamber having a cylindrical shape and located in the outflow passage; and a cylindrical rotation support part which is continuous with the valve chamber in the axial direction,

the device is provided with:

a valve member having a valve base portion rotatably disposed on the rotation support portion and a valve portion that rotates integrally with the valve base portion and rotates in the valve chamber; and

a sealing member which rotates integrally with the valve portion and closes the opening portion of the outflow passage toward the valve chamber so as to face the opening portion,

the rotation center axis position of the seal member when the seal member rotates is eccentric with respect to the rotation center axis positions of the rotation support portion and the valve base portion, and the seal member is pressed against the opening portion according to the rotation of the seal member.

11. The fluid on-off valve according to claim 1, wherein,

an outflow pipe is disposed downstream of the outflow passage of the valve body, and is rotatably held with respect to the valve body.