JPH0763274A - Cutoff valve device - Google Patents

Abstract

PURPOSE:To provide a simple constitution without mounting a reset operation device for resetting a cutoff valve body to a valve opening state after the valve is operated to close as a cutoff valve device for opening and closing an opening of a valve seat according to normal recovery time, etc., at emergency in a state it is separately placed with the cutoff valve body. CONSTITUTION:A disc or cylindrical inner yoke 107, a permanent magnet 105 which magnetization direction is to right angles with an axis of a solenoid coil and an outer yoke 106 are arranged in this order from inside so as to interpose or surround the solenoid coil 108 axially symmetrically. Plates opposite to both ends sides of the solenoid coil 108 each other in a distance is included as a part of a magnetic path in the outer yoke 106. Attraction boards A1 and A2 are formed integrally between the both plates of the outer yoke 106 and the both end surfaces of the solenoid coil 108 on a bar plunger 103 for penetrating the solenoid coil 108 and supporting a valve body 101 for opening/closing an opening of a valve seat for shifting axially on a tip and a spring 104 is mounted between the plunger 103 and the valve body 101.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shut-off valve which is used by being mounted on a gas meter or the like, which closes an opening of a valve seat through which a fluid flows in an emergency and releases the closing of the opening when a normal condition is restored. Regarding the configuration of the device.

[0002]

2. Description of the Related Art As a shut-off valve device mounted and used in a conventional gas meter or the like, for example, one disclosed in Japanese Utility Model Publication No. 2-27741 is known. This will be described with reference to FIG. 6. Reference numeral 1 in the drawing is a self-holding solenoid device (internal structure not shown) provided with a permanent magnet for holding the valve body 3 in the valve opening position, and 2 is a plunger. 3 is a valve element connected to the plunger 2, 4 is a spring for urging the valve element 3 in the closing direction, 5 is a fixed valve seat, 6 is a movable valve seat on the inner circumference of the fixed valve seat 6, and 7 is a fixed valve seat. An O-ring as a sealing material for keeping airtightness between the valve seat 5 and the movable valve seat 6, 8 is an inner cylinder, 9 is inside the inner cylinder 8, and has a return button 10 at one end and the other one. A push rod whose end is connected to the movable valve seat 6, 12 is a detachable cap that covers the return button 10, and 13 is a partition wall that forms a gas flow path. In the event of an emergency such as an earthquake or gas leak, when a cutoff signal is input to the self-holding solenoid device 1 in the valve open state shown in the figure, the magnetic flux in the opposite direction passes through the permanent magnet in the solenoid device 1 and the permanent magnet retains its holding force. Then, the valve body 3 moves downward in the figure by the force of the spring 4 and comes into contact with the fixed valve seat 5 to close the valve. In the return operation for opening the valve at the time of returning to the normal state, the valve body 3 is returned via the movable valve seat 6 by pushing the return button 10 by hand. Here, the surrounding wall of the movable valve seat 6 is set to have a length in the axial direction longer than the stroke of the valve body 3, and the valve body 3 and the movable valve seat 6 are in a state where the return button 10 is being pressed. The gas flow is cut off by the, and after the return operation of the valve element 3, the cap 12
Even if foreign matter is put inside and the cap 12 is attached, the flow of gas is shut off by the valve body 3 and the movable valve seat 6 in an emergency, so that safety is maintained. Further, as in the case where the valve body 3 is returned only by the push rod without the movable valve seat 6 interposed, the push rod 9 can prevent the fixed valve seat 5 from closing due to the insertion of the foreign matter, which is a safety problem. There is no such thing.

[0003]

However, in the above-mentioned structure, the device has a structure in which the shutoff mechanism for shutting off the gas flow and the return operation mechanism including the movable valve seat are separated.
There is a problem in that this configuration cannot be adopted in the case where the return operation mechanism cannot be provided on the valve body side due to the structure of the gas meter, since it is costly in manufacturing and the return operation is performed from the valve body side. .

An object of the present invention is to provide a shut-off valve device having a simple structure which can return the valve body without the need for a separate return operation mechanism.

[0005]

In order to solve the above-mentioned problems, in the present invention, the opening of the valve seat through which the fluid flows is closed in an emergency and the opening is released when the normal condition is restored. The shutoff valve device includes a plate having an electromagnetic coil, a plate-shaped or cylindrical inner yoke that sandwiches or surrounds the electromagnetic coil in an axially symmetrical manner, and an inner surface that is in substantially full contact with the outer surface of the inner yoke. -Shaped or cylindrical permanent magnet having a magnetizing direction perpendicular to the axis of the electromagnetic coil, and an inner surface that is in substantially full contact with an outer magnetic pole surface of the permanent magnet and both end surfaces of the electromagnetic coil. A U-shaped or bottomed cylindrical outer yoke having flat plate surfaces facing each other with a space as a part of a magnetic path, and a rod-shaped outer yoke for axial movement of the electromagnetic coil. It will be distributed and An adsorbing plate that is adsorbed by the flat plate surface is integrally provided between both end surfaces of the coil and the flat plate surface of the outer yoke that faces the both end surfaces, and is outside of one opposing plate surface of the outer yoke. A plunger that supports the valve body facing the valve seat so as to be movable in the axial direction of itself, and a spring that is interposed between the plunger and the valve body and biases the valve body toward the valve seat side. To do.

Here, a valve body is supported by a plunger so as to be movable in the axial direction of the plunger, and a spring for biasing the valve body toward the valve seat side can be interposed between the plunger and the valve body. The structure is such that a flange serving as a spring seat is formed at the tip of the plunger, a recess coaxial with the plunger is formed at the tip of the plunger, and the tip cannot be removed from the recess after the tip is inserted into the recess. The valve rod is integrated with the valve body by matching the moving direction of the valve body and the axial direction, or by forming a recess coaxial with the plunger at the plunger tip and inserting the tip into the recess. After that, the valve rod that is prevented from slipping out of the recess is integrated with the valve body by aligning the moving direction of the valve body with the axial direction, and the depth of the recess is desired in the recess. Spring with a spring force of Good to be obtained by a retractable depth.

[0007]

When the shut-off valve device is constructed in this way, the shut-off valve device performs both shut-off operation and return operation for restoring the shut-off valve body by simply changing the direction of the direct current flowing through the electromagnetic coil. It is possible to install the shut-off valve device regardless of the structure of the gas meter without requiring a space for the returning operation. Also, compared with the self-holding solenoid device in the conventional shutoff valve device, the permanent magnet has a structure in which the electromagnetic coil is sandwiched or surrounded in an axially symmetrical manner, and the dimension of the electromagnetic coil in the direction perpendicular to the axis is slightly larger. However, it has a structure that does not require a permanent magnet in the axial direction and has two attraction plates (one for shutting operation and the other for returning operation) that is integrated with the plunger by utilizing the space. Thus, it is possible to provide both the shutoff and return functions with substantially the same size as the conventional self-holding solenoid device. In addition, the plunger placed inside the electromagnetic coil has a structure that supports the valve element so that it can move in the axial direction from its own, and a spring is interposed between the valve element and the plunger so that the valve is closed. Then, the plunger always receives a force in the returning direction, and the electromagnetic coil current required for the returning operation is small.

A valve body support structure in which a plunger supports the valve body so that the plunger can move in the axial direction, and a spring for urging the valve body toward the valve seat can be interposed between the plunger and the valve body. Forms a flange that serves as a spring seat at the tip of the plunger, forms a recess coaxial with the plunger at the tip of the plunger, and prevents the stopper from slipping out of the recess after the tip is inserted into the recess. The valve rod is integrated with the valve body by aligning the moving direction of the valve body with the axial direction, or a recess coaxial with the plunger is formed in the plunger tip, and the tip is inserted into the recess. After that, the valve rod, which cannot be pulled out from the recess, is integrated with the valve body by aligning the moving direction of the valve body with the axial direction and integrating the depth of the recess into the desired spring. Holds a spring with force By enabling depth, it is possible to obtain a valve body support structure of interest without complicating the structure of the apparatus.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the structure of a shutoff valve device according to the present invention will be described below with reference to the drawings. The device is an electromagnetic coil 1 including a bobbin 108a which is a winding frame of a winding, and a winding coil 108b formed by winding a conductive wire around the bobbin 108a.
08, two flat plate-shaped inner yokes 107 that sandwich the electromagnetic coil 108 in axial symmetry, and an inner surface that is in substantially full contact with the outer surface of the inner yoke 107. The electromagnetic coil 10 has a plate-shaped permanent magnet 105 that is perpendicular to the axis and an inner surface that is in almost full contact with a magnetic pole surface outside the permanent magnet 105.
Two U-shaped outer yokes 106 each having a flat flat plate facing each other with a space therebetween as a part of the magnetic path;
The plunger 103 that is movable in the axial direction inside the bobbin 108a of the electromagnetic coil 108, the valve body 101, and the valve body 10
1 and a flange 10 formed on the end surface of the plunger 103
Compression coil spring 104 interposed between 3A and 3A
And a valve rod 1 for connecting the valve body 101 to the plunger 103.
02 and the main components. In the figure, reference numeral 110 is a case made of an insulating material, 111 is a mounting base made of an insulating material or a non-magnetic metal, and 112.
Is a cylindrical guide for guiding the axial movement of the plunger 103, 113 is an O-ring as a sealing material for preventing dust from entering the case 110, and 114 is a valve seat of a gas meter.

The figure shows the valve open state of the device.
Suction plate A integrated with jar 103 ₁Is the outer yoke 10
Adsorbed on the upper surface of 6, the adsorption plate A₂Is under the bobbin 108a
The magnetic flux of the permanent magnet 105 is almost in contact with the surface.
Pass in the direction of the arrow. Electromagnetic coil 10 in an emergency
When a direct current is input to 8 as a cutoff signal, the suction plate A
₁In the direction opposite to the magnetic flux of the permanent magnet passing through
₁A magnetic flux passing through the inside is generated, and this is the adsorption plate A₁Magnetic flux passing through
To cancel the suction plate A₁On the upper surface of the outer yoke 106
The pulling force disappears. On the other hand, the magnetism generated by the electromagnetic coil 108
The bundle is a permanent magnet passing under the outer yoke 106.
The lower surface of the outer yoke 106 and the plunger in the same direction as the magnetic flux of
Attempt to pass through 103. At this time, the plunger 103
The magnetic flux inside is saturated, and the excess magnetic flux is below the outer yoke 106.
Surface and suction plate A₂It passes through the space between₂Inside
Inside the bobbin 108a while partially canceling the magnetic flux of the permanent magnet
Enter the plunger part on the side. As a result, the suction plate A₂To
A force that attracts toward the lower surface of the outer yoke 106 is generated,
The jar 103 is driven downward, and the spring 104
The valve body 101 is pressed against the valve seat 114 of the gas meter.
After the pressure contact, the pressure difference before and after the valve body 101 is added, and the valve seat 11
The closure of 4 becomes more reliable.

In order to return the valve-closed device to the valve-opened state, the electromagnetic coil 108 is supplied with a direct current in the direction opposite to that when the valve is closed. As a result, the suction force to the suction plate A ₂ disappears by the same principle as when the valve is closed, and instead, a force to suction the suction plate A ₁ to the upper surface of the outer yoke 106 is generated. At this time, the plunger 103 receives an upward force by the spring 104, and the electromagnetic coil current required for the return is smaller than that when the valve is closed.

2 and 3 show the states of the main parts of the device during the valve closing operation. By setting the movable distance X ₂ of the suction plates A ₁ and A ₂ larger than the distance X ₁ between the valve body 101 and the valve seat 114 in the valve open state (FIG. 1), the spring force corresponding to this difference ΔX. Is applied to the spring force of the spring 104 at the open position (FIG. 1) to ensure the closing of the valve seat 114 until the gas pressure on the lower surface side of the valve body 101 disappears by closing the valve.

FIG. 4 shows an embodiment different from FIG. 1 of the valve body support structure by the plunger, in which the spring 104 can be interposed between the plunger and the valve body. A recess 103B is formed at the tip of the plunger 103.
The depth of B is formed so that the spring force becomes a desired force when the suction plate A ₂ is sucked onto the lower surface of the outer yoke 106.

[0014]

According to the present invention, since the shut-off valve device is configured as described above, the shut-off valve main body for shutting off the fluid by driving the valve body to the closed position in an emergency is opened. The valve body can be returned to the open position without providing a return operation mechanism for returning to the normal state separately from the shutoff valve body, the structure of the device is simplified, and the manufacturing cost of the device is reduced. . Further, even when the return operation mechanism cannot be provided on the valve body side due to the structure of the gas meter or the like for mounting the device, the device can be mounted without any problem, and the versatility is improved in application.

Then, a spring for independently pressing the valve body against the valve seat during the valve closing operation until the back pressure becomes zero,
Since the valve is inserted between the plunger and the valve body, which is driven in the valve opening direction when the valve is opened, the electromagnetic coil current required for the valve opening operation is small and the return operation is performed electrically. Therefore, the power consumption for the power consumption can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the configuration of a shutoff valve device according to the present invention.

FIG. 2 is a cross-sectional view of the main part of the device showing the amount of deformation of the plunger and valve body spring when the valve is closed.

FIG. 3 is a cross-sectional view of a main part of the device showing a position of a suction plate A _{2 at} the time of starting valve closing or opening valve.

FIG. 4 is a cross-sectional view showing an embodiment of the valve body support structure of the plunger different from that of FIG. 1 in a state where the plunger of the valve body support structure according to the embodiment is incorporated in the same shut-off valve device body as that of FIG.

FIG. 5 is a sectional view of an essential part showing an example of the configuration of a conventional shutoff valve device.

[Explanation of symbols]

101 valve body 102 valve rod 103 plunger 103A flange 103B recessed portion 104 spring 105 permanent magnet 106 outer yoke 107 inner and outer yoke 108 electromagnetic coil A ₁ adsorption plate A ₂ adsorption plate

Claims (3)

[Claims] 1. A device for closing an opening of a valve seat through which a fluid flows in an emergency or the like, and releasing the closing of the opening when a normal condition is restored, the electromagnetic coil and the electromagnetic coil being sandwiched in axial symmetry. Alternatively, a plate-shaped or cylindrical inner yoke that surrounds the inner yoke and an inner surface that is in substantially full contact with the outer surface of the inner yoke are formed in a plate-shaped or cylindrical shape, and the magnetization direction is perpendicular to the axis of the electromagnetic coil. And a flat plate surface that has an inner surface that is in substantially full contact with the outer magnetic pole surface of the permanent magnet and that faces both end surfaces of the electromagnetic coil with a space therebetween as a part of the magnetic path. An outer yoke having a U-shape or a cylindrical shape with a bottom, and a rod-shaped outer yoke arranged inside the electromagnetic coil so as to be movable in the axial direction of the electromagnetic coil and facing both end faces of the electromagnetic coil. Flat plate of the outer yoke And an adsorbing plate adsorbed on the flat plate surface, respectively, and a valve body facing the valve seat is supported movably in the axial direction on the outside of one of the opposing plate surfaces of the outer yoke. A shut-off valve device comprising: a plunger; and a spring interposed between the plunger and the valve body to urge the valve body toward the valve seat. 2. The apparatus according to claim 1, wherein the plunger supports the valve element such that the plunger can move in the axial direction, and the valve element is urged toward the valve seat side between the plunger and the valve element. A valve body support structure capable of interposing a spring has a flange serving as a spring seat formed at the plunger tip, a recess coaxial with the plunger is formed at the plunger tip, and the tip is inserted into the recess. After that, the shutoff valve device is obtained by unifying the valve rod, which is incapable of slipping out of the recess, with the valve body by aligning the moving direction of the valve body with the axial direction. 3. The device according to claim 1, wherein the plunger supports the valve body so that the plunger can move in the axial direction, and the valve body is urged toward the valve seat side between the plunger and the valve body. The valve body support structure capable of interposing a spring has a recessed portion coaxial with the plunger formed at the tip end portion of the plunger, and cannot be pulled out from the recessed portion after the tip end portion is inserted into the recessed portion. The valve rod is integrated with the valve body by aligning the moving direction of the valve body and the axial direction, and the depth of the recess is set to a depth capable of accommodating a spring having a desired spring force in the recess. A shutoff valve device obtained by the above.