JP2002061764A - Valve gear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve gear that can achieve backflow prevention and excess flow prevention in a fluid passage via a single system. SOLUTION: The valve gear 10 includes a cylinder 12 having a fluid inlet at one end and a fluid outlet at the other, an annular valve seat 20 formed on at least either of the cylinder inlet and outlet in face to the cylinder interior, a spool 32 housed in the cylinder so as to slide in the cylinder by fluid pressure while ensuring circulation of the fluid flowing into the cylinder between the inlet and the outlet, an internal magnet 36 built in the spool, valve parts 42 formed at the spool ends to close the inlet or outlet and check the fluid circulation when pressed against the valve seat, and an external magnet 28 mounted on the cylinder periphery along the circumference thereof. The magnetic force acting between the external magnet 28 and the magnet 36 urges the spool 32 toward the valve seat 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve device used for preventing backflow and overflow of a fluid such as liquid or gas.

[0002]

2. Description of the Related Art As a conventional technique as a background of the present invention, Japanese Patent Application Publication No. 25625665 discloses an apparatus for driving an object such as a door by a fluid pressure such as tap water. In such equipment, in order to minimize the damage of water leakage accidents due to pipe breaks and equipment failures,
The development of a device that detects an abnormality and instantaneously stops the water flow was essential. When tap water is used as a driving source, it is necessary to prevent water on the faucet side from flowing back to the water supply pipe from the viewpoint of sanitation.

[0003]

However, in the conventional overflow prevention valve and backflow prevention valve, the spool is urged only in one direction by using a spring, so that the backflow prevention and the overflow prevention are performed by one valve. Was difficult to achieve. Therefore, there is no other means except to separately prevent the overflow to the drive device such as the door and the backflow to the supply pipe with a plurality of valve devices, which increases the number of parts, increases the cost, and reduces the manufacturing and maintenance. Was also inconvenient.

[0004] Therefore, a main object of the present invention is to provide a valve device capable of achieving backflow prevention and overflow prevention in a fluid flow path with a single device and capable of adjusting the flow rate.

[0005]

SUMMARY OF THE INVENTION A valve device according to the present invention has a tubular body having a fluid inlet at one end and a fluid outlet at the other end; A valve seat formed in at least one of the outlets facing the cylindrical body, and a fluid pressure housed in the cylindrical body and flowing fluid between the inlet and the outlet while flowing the fluid into the cylindrical body. A spool that slides in the cylindrical body, an inner magnet fixed to the spool, and an inlet or outlet formed at the end of the spool and pressed against a valve seat to block the flow of the fluid by stopping the flow of the fluid. A valve portion, and an outer magnet mounted on an outer peripheral portion of the cylindrical body along a circumferential direction thereof, wherein the spool is urged toward a valve seat by a magnetic force acting between the outer magnet and the inner magnet. , A valve device. During the flow of the fluid, the spool is separated from the inflow port by the fluid pressure. Then, within a certain fluid pressure range up to the overflow, the spool is urged against the fluid pressure by the magnetic force acting between the inner magnet and the outer magnet so that the valve portion does not sit on the valve seat. However, at the time of overflow or backflow, the spool is urged by the magnetic force and the fluid pressure, and the valve portion is seated on the valve seat to close the flow of the fluid. Therefore, this valve device can prevent backflow and overflow with one device. Further, since the structure is relatively simple, it is easy to reduce the cost.

Further, in the valve device according to the present invention, the spool has a columnar body to which the inner magnet is fixed, and a peripheral body surface of the columnar body such that the center axis of the inner magnet substantially coincides with the center axis of the cylindrical body. And a passage formed between the plurality of protruding portions on the circumferential surface of the columnar body to allow fluid to flow therethrough, and a small distance between the protruding portion and the inner wall surface of the cylindrical body. It is preferable to slide on the inner wall surface while having an appropriate gap. Thereby, the magnetic force of the exterior magnet can be uniformly applied to the interior magnet without bias.

[0007] In the valve device according to the present invention, a shaft formed so as to extend inward along the central axis of the tubular body while having a passage through which fluid flows inside surrounded by an annular valve seat. The spool includes a recess in which the head of the shaft is fitted, and when the head of the shaft and the recess fit together, the spool slides before the valve portion is seated on the valve seat. The dynamic speed may be reduced. In this case, when the head of the shaft is fitted into the recess, the fluid interposed between the two acts as a buffer, and the moving speed of the spool is reduced. This prevents the flow of the supply fluid from suddenly stopping, thereby preventing the occurrence of water hammer in the supply pipe.

Further, in the valve device according to the present invention, it is preferable that the outer magnet is mounted so as to be displaceable in the longitudinal direction of the cylindrical body. In the valve device according to the present invention, in order to bias the spool by the repulsive force of the exterior magnet and the interior magnet, the interior magnet needs to be located between the exterior magnet and the closed valve seat. Therefore, by displacing the exterior magnet in the direction opposite to the sliding direction of the spool, the positional relationship between the exterior magnet and the interior magnet of the spool can be changed, and the biasing direction of the spool can be switched.

Further, the valve device according to the present invention preferably further comprises a forced displacement means for forcibly displacing the position of the exterior magnet in the longitudinal direction of the tubular body in order to switch the biasing direction of the spool. . In this case, when a slight fluid leak occurs, the position of the exterior magnet can be forcibly displaced in the axial direction of the cylindrical body to switch the biasing direction of the spool.

Further, in the valve device according to the present invention, the steady position of the exterior magnet is variably adjusted back and forth in the longitudinal direction of the cylindrical body so that the valve portion of the spool is brought into pressure contact with the valve seat. It is preferable to include a flow rate adjusting means for adjusting the flow rate. In this case, if the stationary position of the exterior magnet is set on the inlet side, the flow can be stopped at a smaller flow rate, and if the stationary position is set on the outlet side, the flow can be stopped at a higher flow rate. it can.

Further, in the valve device according to the present invention, a bypass passage connecting the inflow side and the outflow side of the cylindrical body is provided, and one end and the other end of the valve portion of the spool pressed against the valve seat. Release means for opening the valve portion of the spool from the valve seat by equalizing the pressure on the side or by providing a flow path that is open to the atmosphere from the inlet side and releasing the pressure remaining on the inlet side. It is preferred to include. In this case, the recovery work after eliminating the cause of the overflow or the backflow can be facilitated.

The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments of the present invention with reference to the drawings.

[0013]

FIG. 1 is an exploded perspective view showing one embodiment of a valve device according to the present invention. The valve device 10 includes a cylindrical body 12 as a cylindrical body. Cylindrical body 1
2, an end cover 14a is fitted to one end serving as an inlet of tap water as a fluid of this embodiment, and an end cover 14b is fitted to the other end serving as an outlet. The end covers 14a and 14b are provided with an elongated rod-shaped connecting member 44,
At 44, they are integrally connected.

The end covers 14a and 14b are
2, cylindrical fitting portions 16, 16 fitted inside both ends
Is provided. An O-ring 18 for sealing the inside of the cylindrical body 12 is fitted to the fitting portion 16. Annular valve seats 20a, 20b are fixed inside the fitting portions 16, 16 so as to face the inside of the cylindrical body 12.

The end covers 14a and 14b have joints 21 and 22, respectively, on the side opposite to the cylindrical body 12. Tubes 24 and 26 made of, for example, stainless steel or soft resin are detachably attached to the joints 21 and 22, respectively. In this embodiment, tube 24 is an inflow side line and tube 26 is an outflow side line. Note that pipes may be directly connected instead of the tubes 24 and 26. In that case joint 2
Steps 1 and 22 become unnecessary. Further, the inflow side may be directly connected to the pipe, and the outflow side may be connected to the tube 26 via the joint 22.

An outer magnet 28 is mounted on the outer wall of the cylindrical body 12. The exterior magnet 28 of this embodiment is a flat annular permanent magnet extending along the outer peripheral direction of the cylindrical body 12, one of which is polarized N-pole and the other is S-pole in the thickness direction. Also,
A cylindrical sleeve 30 is mounted on the outer wall of the cylindrical body 12. The sleeve 30 is for holding the exterior magnet 28 at an intermediate portion of the cylindrical body 12, and has one end portion of the exterior magnet 2.
8 and the other end thereof is in contact with the end cover 14b.

A spool 32 is accommodated inside the cylindrical body 12 so as to be slidable in the longitudinal direction of the cylindrical body 12. Spool 3
2 includes a columnar body 34 having a substantially cylindrical shape. Inside the columnar body 34, an internal magnet 36 made of a columnar permanent magnet having the same central axis as the columnar body 34 is integrally incorporated. Here, the central axis is an imaginary line extending in the longitudinal direction through the center of the cylindrical body 12. One of the inner magnets 36 is polarized to the N pole and the other to the S pole along the direction in which the center axis of the spool 32 extends.
The polarity relationship between the exterior magnet 28 and the interior magnet 36 will be described later. A fin-shaped protruding piece 38 extending in the longitudinal direction of the columnar body 34 is formed on the peripheral body surface of the columnar body 34 so as to protrude toward the inner wall surface of the cylindrical body 12. In this embodiment, for example, four projecting pieces 38 are formed as shown in FIG. 2, but the present invention is not limited to this. The distal ends of the plurality of protruding pieces 38 are formed so as to have a slight gap between them and the inner wall surface so that the spool 32 slides inside the cylindrical body 12 in the longitudinal direction without rattling. The plurality of projecting pieces 38 are formed such that the center axis of the spool 32 substantially matches the center axis of the cylindrical body 12. A portion surrounded by the peripheral wall surface of the columnar body 34 and the inner wall surface of the cylindrical body 12 between the adjacent projecting pieces 38 becomes a passage 40 for flowing tap water. The basic flow rate is set by increasing or decreasing the sectional area of the plurality of passages 40.

At both ends of the spool 32, conical valves 42a and 42b as valve portions are formed integrally with the columnar body 34. The conical valves 42a and 42b are respectively connected to the valve seats 20a and 20b.
This is to stop the distribution of tap water in cooperation with b.
That is, when the conical valve 42 is seated on the valve seat 20, the conical valve 42 is formed in a size to completely close the through hole at the center of the valve seat 20. At this time, the apex of the conical valve 42 protrudes into the annular valve seat 20, and the conical surface of the conical valve 42 and the annular valve seat 20 are pressed against each other. The conical surface of the conical valve 42 is also a pressure receiving portion that receives water pressure for sliding the spool. Spool 3
2 slides in the cylindrical body 12 by being pushed by the water pressure while flowing the inflow water flowing into the cylindrical body 12 from the passage 40. One of the conical valves 42 of the spool 32 is
When the central through hole of one of the valve seats 20 in the longitudinal direction is closed, water flowing from the central through hole of the other valve seat 20 is blocked, and the conical valve 42 and the valve seat 20 are strongly pressed by the hydraulic pressure. Will be done. In this embodiment, the conical valve 42 and the valve seat 20 are formed of an elastic material such as silicone rubber, for example, but optimal ones are appropriately selected according to the properties of the fluid.

It is preferable that a drain hole 46 is formed in the end cover 14a, for example, as shown in FIG. 3, and a switch valve (not shown) is attached to the drain hole. Further, it is preferable to connect a supply stop means such as a main cock or a water stopcock to the inflow water side outside the end cover 14a. These reasons will be described later.

Next, referring to FIGS. 3 to 5, FIG.
An operation state of the illustrated valve device 10 will be described. FIG. 3 is an illustrative view showing a backflow prevention state of the valve device shown in FIG. The left side in FIG. 3 is the inflow side, and the right side is the outflow side. Tap water is supplied to the inflow side from the tap main. A hydraulically driven actuator or the like as disclosed in Japanese Patent No. 25662565 is connected downstream of the outflow water.

The state shown in FIG. 3 is a state in which water is not consumed downstream of the valve device 10. In the state shown in FIG. 3, the interior magnet 36 and the exterior magnet 28 are urged in directions to repel each other, the conical valve 42a of the spool 32 is lightly pressed against the valve seat 20a on the left side in the figure, and the exterior magnet 28 is
Pressed lightly to zero. At this time, the drain hole 46 is closed. Therefore, the spool 32 remains seated on the valve seat 20a on the left side in the drawing unless the water pressure higher than the repulsive force of the internal magnet is applied, and the conical valve 42a and the valve seat 20a
The through hole at the center of the valve seat 20a is closed by the close contact of the valve seat 20a, so that the backflow can be prevented instantaneously.

When a water pressure within a predetermined range equal to or more than the repulsive force acting between the two magnets is applied to the inflow side on the left side in FIG. 3 or when the pressure on the right side decreases due to consumption of water on the actuator side, the left side in the figure Due to the water pressure applied to the spool 32
Moves inside the cylindrical body 12 to the right in the drawing against the repulsive force of the interior magnet. Then, as shown in FIG. 4, when the valve seat 20a and the conical valve 42a are separated from each other, water flowing from the left side in the drawing passes through the passage 40 extending along the peripheral body wall surface of the columnar body 34 of the spool 32 and goes to the right side in the drawing. And outflow. The outflowing water is supplied to a downstream actuator (not shown). In the state shown in FIG. 4, the inner magnet 36 of the spool 32 is located on the valve seat 20 side on the left side of the outer magnet 28 with respect to the outer magnet 28. It is urged to. Therefore, within a constant hydraulic pressure range in which the repulsive force due to the magnetic force and the hydraulic pressure are substantially balanced, the spool 32 slides around the position shown in FIG.
Water flowing in from the left side in the figure continues to flow out to the right side in the figure.

When the water pressure flowing from the left side of the drawing becomes lower than a predetermined value, or when the water pressure on the right side of the drawing rises above a certain value, the conical valve 42a of the spool 32 constantly biased to the left side of the drawing sits on the valve seat 20a. As a result, the flow of water is stopped. When the flow stops, the spool 32 is pressed against the valve seat 20a by the repulsive force acting between the two magnets and the water pressure. The main pressing force is the water pressure for pressing the spool 32 against the valve seat 20a. Therefore, backflow to the water main is completely prevented.

When a large amount of water leak accidents or the like occur in an actuator (not shown) connected downstream of the valve device 10, the flow rate of the water passing through the passage 40 increases, and the flow rate of the water increases. Is increased to the right side in the figure. When this pressure exceeds the repulsive force acting between the two magnets in the leftward direction in the drawing, the state shown in FIG. 4 changes to the state shown in FIG.
Is seated on the valve seat 20b on the right side in the figure, the through hole at the center of the valve seat 20b is closed, and the flow of water is stopped. The conical valve 42b of the spool 32 is pressed against the valve seat 20b by the water pressure of the tap water flowing from the left side in the figure. In this way, overflow is prevented, and damage to a water leak accident due to failure of a device connected downstream of the valve device 10 or breakage of piping can be minimized.

After the state shown in FIG.
In order to return to the original state shown in FIG. 3, the water stop valve (not shown) on the supply water side on the left side of the drawing is closed to stop the supply of tap water to the valve device 10, and then the tap water is connected to the drain hole 46. The switch valve (not shown) is opened. Thereby, the water accumulated on the left side in FIG. 5 flows out from the drain hole 46, and the water pressure on the left side of the spool 32 in the figure is released. Then, pressure can be applied to the right side of the spool 32 in the drawing or biased by a magnetic force to return to the original state shown in FIG.

In the state shown in FIG. 5, the positional relationship between the exterior magnet 28 and the interior magnet 36 is at a position aligned on the same line V extending perpendicular to the central axis C of the cylindrical body 12. At this time, the urging force by the magnetic force acting between the exterior magnet 28 and the interior magnet 36 is minimized.

According to the valve device 10 of this embodiment,
The backflow prevention and the overflow prevention in the fluid flow path can be achieved by one device. Since the valve device 10 operates only by the pressure of the fluid without using electricity, there is no need to worry about leakage or the like, and there is no need for cost such as insulation. Furthermore, since the water that has passed through the valve device 10 becomes magnetic water, the solidification of the calky on the inner surface of the tank that stores the flow path of components such as the downstream hydraulic cylinder, the directional control valve, and the switch valve and the water for the drive system. The effect that objects and slime are less likely to adhere is obtained.

FIG. 6 shows a modification of the valve device shown in FIG. FIG. 6 shows that the spool 32 is in the overflow state and the conical valve 42b
At the moment when it comes into contact with the valve seat 20b. At this time,
The center line v2 of the interior magnet 36 is the center line v1 of the exterior magnet 28.
The spool 32 is biased toward the valve seat 20b by the repulsive force acting between the two magnets. In this modification, the outer magnet 28 includes a sleeve 30 and a sleeve 31.
And sandwiched between. A plurality of springs 35 are fixed to the right end surface of the sleeve 30 in the figure in a contractible manner. Each of the plurality of springs 35 has an elasticity stronger than a repulsive force acting between the exterior magnet 28 and the interior magnet 36. On the other hand, an interval 37 for displacing the exterior magnet 28 is provided between the illustrated left end of the sleeve 31 and the end cover 14a.

FIG. 7 shows the return operation of the valve device shown in FIG. 6, in which the sleeve 31, the outer magnet 28 and the sleeve 30 are moved to the right by hand while compressing the spring 35. FIG. In this case, since the center line v2 of the inner magnet 36 is on the left side of the center line v1 of the outer magnet 28, when the water pressure on the left side of the drawing is lower than or the same as the right side of the drawing,
Due to the repulsive force acting between the two magnets, the spool 32 moves the valve seat 2
It is urged to the 0a side and automatically returns to a state similar to the state shown in FIG.

FIG. 8 is a sectional view of a modified example of the valve device shown in FIG. 7, and FIG. 9 is a front view of the appearance. In this modification, an adjusting screw 72 is provided on the end cover 14a as a flow rate adjusting means. The adjustment screw 72 is screwed to a lock nut 71 fixed to the left side of the end cover 14a in the drawing. The right end in the figure of the adjusting screw 72 is in contact with the end surface of the sleeve 31. By adjusting the position of the adjusting screw 72 to the left and right in the figure, the steady position of the exterior magnet 28 can be appropriately set again. As a result, the position at which the repulsive force acting between the two magnets is maximized can be appropriately reset, so that the flow rate or flow pressure at which the conical valve 42b starts the operation of closing the valve seat 20b as described below is reduced. Can be adjusted.

That is, when the length of the adjusting screw 72 protruding rightward in the drawing is increased, the steady position of the armature magnet 28 moves rightward in the drawing, so that the position where the repulsive force of the two magnets becomes maximum is determined. The adjustment screw 72 is moved rightward in the figure by the amount of protrusion. As a result, the flow rate of water passing through the valve device 10 until the flow is closed is increased. Conversely, if the length of the adjusting screw 72 protruding rightward in the drawing is shortened, the position where the repulsive force of the two magnets becomes maximum moves leftward in the drawing, so that the valve device 10 is closed before the flow is closed. The amount of water passing through is reduced. When this flow rate adjusting means is provided, it is possible to cope with a wider use condition.

FIG. 10 is an illustrative sectional view showing another embodiment of the valve device according to the present invention. The valve device 50 shown in FIG. 10 is different from the valve device 10 shown in FIG. 1 in that it has a forced displacement means for the exterior magnet, a spool deceleration means, and a flow adjustment means. Although different, they are common in the basic configuration. Therefore, the following description focuses on the differences.

The valve device 50 of the embodiment shown in FIG.
Includes a shaft 52 extending along the central axis of the cylinder 12. The shaft body 52 is disposed inside a space surrounded by the valve seat 20b on the right side in the figure with a gap serving as a fluid passage between the shaft body 52 and the valve seat 20b. A fluid passage around the shaft 52 is supplied to a downstream actuator or the like from a pipe 80 on the right side in the figure. A cylindrical bulging head 54 is formed at one end of the shaft body 52, and the other end is screwed to the end cover 14b. Bulging head 54
Are formed around the periphery of the O-ring groove 5.
7 is fitted with an O-ring 56. The bottom of the O-ring groove 57 is tapered so as to be deep on the left side in the drawing and shallow on the right side in the drawing. A small-diameter passage 58 is formed inside the bulging head 54. One end of the passage 58 is opened at the tip of the bulging head 54, and the other end of the passage 58 is opened to communicate with the bottom of the O-ring groove 57 on the left side in the figure.
On the other hand, a concave portion 60 into which the bulging head 54 fits perfectly is formed in a central portion of the conical valve 42b of the spool 32 facing the bulging head 54. A discharge path 59 having a small diameter is provided near the left end of the concave portion 60 toward the outer periphery of the columnar body 34.

As the spool 32 moves from the left side in the figure to the right side in the figure, the O
While shifting the ring 56 to the right shallow bottom, the bulging head 54 fits into the recess 60 as shown in FIG. When fitted, the water between the recess 60 and the bulging head 54 acts as a buffer. Any water existing between the concave portion 60 and the bulging head 54 is drained because the O-ring 56 keeps watertight in a portion where the O-ring groove 57 becomes shallow in a Taber shape on the right side. It is discharged from the path 59. However, since the discharge path 59 has a small diameter, it is discharged only slowly. Therefore, it takes some time until the concave portion 60 of the spool 32 and the bulging head 54 are completely fitted.
When the concave portion 60 and the bulging head 54 are completely fitted, as shown in FIG.
And the flow of tap water through the valve device 50 is completely stopped. As described above, in this embodiment, the swelling head 54 of the shaft body 52 and the concave portion 60 of the spool 32 constitute the speed reducing means of the spool 32, and the action of the speed reducing means causes the flow path at the center of the valve seat 20b to flow. Is closed slowly, so that water hammer is prevented from occurring in the water main on the supply water side, and the water main can be protected.

Next, the means for forcibly displacing the exterior magnet 28 of the valve device 50 of the embodiment shown in FIG. 10 will be described.
The armor magnet 28 of this embodiment includes a cylindrical sleeve 62.
Are integrally fixed to the intermediate portion of A plurality of cylindrical holes 67 are formed at the right end of the sleeve 62. A spring 65 is formed at the bottom of each of the plurality of cylindrical holes 67. The depth of the cylindrical hole 67 is formed such that the spring 65 is completely inserted into the sleeve 62 when compressed.

The right end of the spring 65 is in contact with the end cover 14b. If the sleeve 62 is forcibly pushed rightward in the figure, the gap 69 shown in FIG. 10 is eliminated, and the right end of the sleeve 62 is Contact
At the left end of the sleeve 62 in the figure, a flow rate adjusting sleeve 105 is provided.
Are screwed together so as to adjust the length protruding from the sleeve 62.

A return plunger 106 is in contact with the left end of the flow control sleeve 105 in the figure. The return plunger 106 is incorporated into the end cover 14a while being urged by the return spring 107 whose pressing force has been adjusted by the adjusting screw 108 so as to protrude rightward in the figure. The plurality of springs 65 push the sleeve 62 to the left in the figure.
Stabilizes at 0.

On the other hand, the end cover 14b is provided with a plunger 66 as forcible displacement means. The distal end of the plunger 66 is disposed so as to be substantially flush with the left side surface of the end cover 14b in the drawing. A Y ring 70 is fitted around an intermediate portion of the plunger 66 to keep the sliding surface of the plunger 66 sealed. The right end of the plunger 66 is connected to a passage 68 for applying hydraulic pressure for driving the plunger. The passage 68 is the end cover 14
Through a pipe (not shown) to a limit valve (not shown). The water supplied to the passage 68 is shown in FIG.
0 A part of the pressurized water supplied from a supply water pipe (not shown) on the left side of the drawing to an actuator (not shown) on the right and downstream side of the drawing through the valve device 50 is refluxed and used. FIG.
0, 11 and 13, the plunger 6
When No. 6 is stored in the end cover 14b, no water pressure is applied to the passage 68. On the other hand, when the plunger 66 protrudes as shown in FIG. 12, the passage 68 is under water pressure. This switching is performed, for example, by a limit valve (not shown). The limit valve is turned on when water leaks from an actuator or the like (not shown) downstream of the valve device 50, and is provided so that water pressure is applied to the passage 68. The detection of water leakage is performed by providing a gutter at a predetermined portion such as an actuator, so that the leaked water collects at one location, and the limit valve is pressed by its weight.

As shown in FIG. 12, when the plunger 66 protrudes, the sleeve 62 and the flow rate adjusting sleeve 105 push the return plunger 106, and the return spring 1
07 is compressed. Then, the position of the exterior magnet 28 is forcibly displaced from the right side to the left side of the interior magnet 36 in the drawing. By reversing the positional relationship between the exterior magnet 28 and the interior magnet 36 in this manner, the spool 32 is urged in the opposite direction to that before, and the conical valve 42b is pressed against the valve seat 20b while being decelerated by the above-described deceleration means. You. Then, the flow path formed in the center of the valve seat 20b on the right side in the figure is closed, and a large water pressure is applied to the spool 32 from the left side in the figure to the right side in the figure. This makes it possible to stop the water flow even when a slight water leak occurs on the actuator side, and to prevent damage caused by a small amount of water leak over a long period of time.

When the supply of water from the valve device 50 to the downstream actuator stops, the supply of water to the passage 68 also stops. When the pressure applied to the passage 68 is reduced, the sleeve 62 is displaced by pushing the plunger 66 into the end cover 14b from the left side in the figure to the right side in the figure due to the restoring force of the return spring 107. Then, in this embodiment, the exterior magnet 28 is
As shown in (2), the inner magnet 36 and the central axis are pushed back to a position substantially common. At this neutral position, the biasing force by the magnetic force hardly acts, and the conical valve 42b of the spool 32 is strongly pressed against the valve seat 20b only by the water pressure of the water supplied from the supply pipe on the left side in the figure. By reducing the water pressure on the left side of the drawing to a negative pressure from the right side of the drawing, or by moving the sleeve 62 until the spring 65 is compressed into the hole 67 and contacts the end cover 14b, the position of the spool 32 is reduced. Can be returned from the position shown in FIG. 13 to the position shown in FIG.

Next, the flow rate adjusting means of the valve device 50 shown in FIG. 10 will be described. An inner diameter screw is provided concentrically with the cylindrical body 12 on the left inner diameter portion of the sleeve 62 in the drawing.
The adjustment sleeve 105 has a sleeve 6 on the right outer peripheral portion.
A male screw that can be screwed into the inner diameter screw 2 is provided. By adjusting the amount by which the adjusting sleeve 105 as the flow rate adjusting means is screwed into the sleeve 62, the position at which the repulsive force acting between the two magnets is maximized can be appropriately reset, whereby the conical valve 42b Can adjust the flow rate at which the operation of closing the valve seat 20b is started.

The valve device according to the present invention is not limited to use in a liquid flow path, but may be used in a gas path such as fuel gas. Further, the present invention is not limited to using the repulsive force between the exterior magnet 28 and the interior magnet 36, but may be arranged so that the polarities are attracted to each other, and the attraction force of both may be used. Further, in the above description, the embodiment in which the valve device is disposed so as to extend in the horizontal direction has been described. However, the present invention is not limited to this, and it goes without saying that the valve device may be disposed so as to extend in the vertical direction or obliquely. . In that case, the gravity acting on the spool can be used together with the magnetic force and the fluid pressure. Further, the valve device according to the present invention may be configured such that the annular valve seat is provided on only one side and a mechanism that satisfies only one of the check valve and the overflow check valve is used.

[0043]

According to the valve device of the present invention,
The backflow prevention and the overflow prevention in the fluid flow path can be achieved by one device. Since this valve device operates only by the pressure of the fluid without using electricity, there is no need to worry about leakage or the like, and there is no need for cost such as insulation. Further, since the structure of the valve device is relatively simple, it is easy to reduce the cost.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a valve device according to the present invention.

FIG. 2 is an illustrative sectional view showing a relationship between a spool and a cylindrical body of the valve device shown in FIG. 1;

FIG. 3 is an illustrative sectional view showing a situation when the valve device shown in FIG. 1 is in a backflow prevention state.

FIG. 4 is an illustrative sectional view showing a situation when a fluid passes through the valve device shown in FIG. 1;

5 is an illustrative sectional view showing a situation when the valve device shown in FIG. 1 is in an overflow prevention state.

FIG. 6 is an illustrative sectional view showing a modified example of the valve device shown in FIG. 1;

FIG. 7 is an illustrative sectional view showing another modification of the valve device shown in FIG. 1;

FIG. 8 is a sectional view of a modification of the valve device shown in FIG. 7;

FIG. 9 is a front view showing the appearance of the valve device shown in FIG.

FIG. 10 is an illustrative sectional view showing a situation when another embodiment of the valve device according to the present invention is in a backflow prevention state.

FIG. 11 is an illustrative sectional view showing a situation when a fluid passes through the valve device shown in FIG. 10;

12 is an illustrative sectional view showing a situation in which the armature magnet of the valve device shown in FIG. 10 is forcibly displaced.

13 is an illustrative sectional view showing a situation when the valve device shown in FIG. 10 is in an overflow prevention state.

[Explanation of symbols]

 10, 10 ', 50 Valve device 12 Cylindrical body 14a, 14b End cover 16 Fitting portion 18 O-ring 20 Valve seat 22 Joint 24, 26 Tube 28 Exterior magnet 30, 31 Sleeve 32 Spool 34 Columnar body 36 Interior magnet 37 Interval 38 Projecting piece 40 Passage 42 Conical valve 44 Connecting member 46 Drain hole 52 Shaft 54 Swelling head 56 O-ring 58 Passage 59 Drainage passage 60 Depression 62 Sleeve 64, 65 Spring 66 Plunger 67 Hole 68 Passage 70 Y-ring 72 Adjustment screw 80 Piping 105 Flow rate adjustment sleeve 106 Return plunger 107 Return spring

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H058 AA05 BB22 BB40 CD09 DD19 EE02 EE05 EE12 3H060 AA05 BB08 CC22 DC08 DD02 DD12 DD14 DD17 EE03 EE05 GG02 HH03 HH07 HH14 3H106 DA05 DA07 DA29 DB32 DC02 DC17 DD03 EE03 GG03 KK12

Claims (7)

[Claims] 1. A tubular body having a fluid inlet at one end and a fluid outlet at the other end, and a tubular body at least one of the inlet and the outlet of the tubular body. A valve seat formed to face the tubular body, the fluid pressure being accommodated in the tubular body, and allowing the fluid flowing into the tubular body to flow between the inflow port and the outflow port while the fluid pressure is applied to the tubular body. An inner magnet fixed to the spool, formed at an end of the spool, and pressed against the valve seat to close the inflow port or the outflow port and stop the flow of the fluid. A valve portion, and an exterior magnet attached to an outer peripheral portion of the tubular body along a circumferential direction thereof, wherein the spool moves toward the valve seat by a magnetic force acting between the exterior magnet and the interior magnet. A valve device that is energized. 2. The spool is formed on a columnar body to which the interior magnet is fixed, and on a peripheral body surface of the columnar body such that a center axis of the interior magnet substantially coincides with a center axis of the cylindrical body. A plurality of protruding portions, and a passage formed between the plurality of protruding portions on the circumferential surface of the columnar body to allow fluid to flow therethrough, between the protruding portion and the inner wall surface of the cylindrical body. The valve device according to claim 1, wherein the valve device slides on the inner wall surface while having a slight gap. A shaft body formed so as to extend inward along a central axis of the tubular body while having a passage through which fluid flows inside surrounded by the annular valve seat; The spool includes a recess into which the head of the shaft is fitted. When the head of the shaft and the recess are fitted to each other, the valve before the valve portion is seated on the valve seat. The valve device according to claim 1, wherein the sliding speed of the spool is reduced. 4. The valve device according to claim 1, wherein the exterior magnet is mounted so as to be displaceable in a longitudinal direction of the tubular body. 5. A forcible displacing means for forcibly displacing the position of the armature magnet back and forth in the longitudinal direction of the tubular body in order to switch the biasing direction of the spool. The valve device according to any one of the above. 6. A flow rate adjusting device that adjusts a flow rate until a valve portion of the spool is pressed against the valve seat by variably adjusting a steady position of the exterior magnet in a longitudinal direction of the cylindrical body. A valve device according to any of the preceding claims, comprising means. 7. A bypass passage connecting the inflow side and the outflow side of the cylindrical body, wherein the pressure at one end and the other end of the valve portion of the spool pressed against the valve seat is reduced. Release means for opening the valve portion of the spool from the valve seat by providing the same or a flow path that is opened to the atmosphere from the inlet side and releasing the pressure remaining on the inlet side by providing a flow path. The valve device according to any one of claims 1 to 6.