JPH032075Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to an emergency shutoff valve used for fuel gas, etc.

(B) Prior Art Generally, as shown in Fig. 3, a conventional emergency shutoff valve has a groove b formed in a part of the valve stem a, and a stopper c is inserted into this groove in a direction approximately perpendicular to the moving direction of the valve stem a. The stopper c is placed in the groove b to hold the valve body in the open state, and in an emergency, the coil f is energized to attract the plunger g to the fixed iron core h and the stopper c is
is removed from the groove b, and the elastic force of the spring j brings the valve body d into contact with the valve seat e, thereby blocking the flow path from the inlet k to the outlet l.

However, in this structure, the stopper c enters the groove b at right angles to the axial direction of the valve stem a, resulting in the following drawbacks.

(1) When removing stopper c, an uneven load is applied to valve stem a, which may prevent valve stem a from moving correctly and smoothly.

(2) When the stopper c comes out from the groove b, the sliding resistance between the two is large, so a large force, that is, a large solenoid is required to drive the stopper c.

(c) Problems to be solved by the invention The problem to be solved by the invention is to improve the stopper part of the valve stem in emergency shutoff valves for fuel gas, etc. so that the movement of the valve stem is smooth and the stopper is smooth. The goal is to make the drive solenoid smaller.

(d) Means for solving the problem The present invention consists of a valve main body having two ports that can communicate with each other through a valve port and a valve seat formed at the open end of the valve port, and a diaphragm surrounding the valve body. It has a valve body that is connected and can engage with the valve seat, a spring that presses the valve body to a closed state, and a solenoid that can operate a movable iron core by energizing a coil to open the valve body. An emergency shutoff valve is equipped with a holding mechanism that releases the open state by energizing a coil that is held, and the holding mechanism includes a sleeve-shaped ball holder fixed to the valve body above the valve body; , a plurality of balls held movably in the radial direction by the ball holder and having a diameter larger than the wall thickness of the ball holder; and a plurality of balls connected to the valve body and movably provided outside the ball holder. and a stopper having different inner diameters, the movable iron core is movably disposed within the ball holder, and the movable iron core is provided with a small diameter portion that allows the ball to move in the radial direction. The structure is as follows.

(E) Function In the emergency shutoff valve with the above configuration, when the solenoid coil is not energized, the movable core is in the downward position and the ball in the ball holder is connected between the large diameter part at the bottom of the inner periphery of the stopper and the outer periphery of the movable core. The valve body is held in the open state away from the valve seat.
Next, when the coil is energized, the movable core is attracted by the fixed core and moves upward, and the ball moves radially inward between the small diameter part on the inner circumference of the stopper and the small diameter part at the bottom of the movable core, and the stopper It becomes movable downward, and moves downward together with the valve stem due to the elastic force of a spring disposed around the outer periphery of the valve stem support, so that the valve body contacts the valve seat and the valve is in a closed state.

To open the valve, stop energizing the coil, move the movable core downward, and pull the stopper upward by hand.

(F) Embodiments Examples of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, 1 is an emergency shutoff valve according to the present invention, and its structure can be roughly divided into 2 and 2.
0 and a holding mechanism section 3 that has a solenoid 40.

The valve body 20 is formed with an inlet portion 21, an outlet portion 22, a valve port 23 that communicates the inlet and outlet portions, and a valve seat 24 around the valve port 23.

The valve mechanism section 2 includes a valve body 25 that comes into contact with the valve seat 24 to shut off the flow of fluid, a valve stem 26 to which the valve body is fixed at one end, and a valve body 20 that is attached to the valve body 25. It includes a diaphragm 27 fixed between it and a mounting member 31 for the holding mechanism section 3, and a spring 28 that presses the valve body 25 into engagement with the valve seat 24.

The holding mechanism section 3 includes a bottomed cylindrical stopper 32 fixed to the other end of the valve stem 26, a hollow cylindrical ball holder 33 fixed by a mounting member 31, and inserted into the stopper 32 so as to be relatively movable. A plurality of radially penetrating holes are formed near the lower end of the ball holder 33, and balls 34 made of steel or the like are held in these holes so as to be movable in the radial direction. The wall thickness of the cylindrical portion of the ball holder 33 is smaller than the diameter of the ball 34, and when this hole is plugged from the outside of the ball holder 33, the ball protrudes inward, and when the hole is plugged from the inside, the ball protrudes outside. It's becoming like that.

The stopper 32 has an inner diameter that is smaller at the upper open end and larger at the lower part, and when the valve body is in the open position shown in FIG.
The tapered portion 37, which changes from the diameter portion 5 to the large diameter portion 36, is positioned exactly at the ball. Therefore, when the valve body 25 is in the open position, the ball 3
4 is pushed outward in the radial direction of the ball holder 33 by the large diameter portion 46 of the movable core of the solenoid 40 and engages with the tapered portion 37, restraining the downward movement of the stopper 32 and holding the valve body 25 in that position. do.

The solenoid 40 includes a cylindrical coil 41, a fixed core 42 fixed to one end of the coil, and a movable core 43 movably inserted into the coil 41. A spring is attached to the upper end of the movable core 43. 44
A hole 44a is formed to accommodate the. The lower end portion of the movable iron core 43 has a reduced diameter to form a small diameter portion 45, which is connected to an upper large diameter portion 46 via a tapered portion 47.

In the emergency shutoff valve 1 having the above configuration, when the valve is in the open state as described above, the coil 4 is
1, the movable iron core 43 is attracted to the fixed iron core 42 and moves upward against the elastic force of the spring 44. Therefore, the tapered part 4 at the lower end of the movable core
7 and the small diameter portion 45 also move upward, the ball 34 in the ball holder 33 moves radially inward, the stopper 32 can move downward, and the spring disposed on the outer periphery of the valve stem support portion 38 moves upward. The valve body 25 moves downward due to the elastic force of the valve 28 and comes into contact with the valve seat 24, thereby closing the valve.

Next, if the current to the coil 41 is stopped, the movable iron core 4
3 can be moved downward by the elastic force of the spring 44, and if the stopper 32 is further pulled upward, the ball 34 will move between the taper part 37 or large diameter part 36 of this stopper and the large diameter of the lower end of the movable core. The downward movement of the stopper 32 is restrained by being sandwiched between the stopper 32 and the valve body 25, and the valve body 25 is in an open state (FIG. 1).

Note that the ball may have an ellipsoidal shape instead of a spherical shape.

(G) Effect The emergency shutoff valve according to the present invention uses balls symmetrically about the axis in the stopper part of the valve stem, and this stopper part and the moving direction of the movable core of the solenoid are arranged on the same axis, which is different from the conventional technology. The unbalanced load, which was a disadvantage, is not applied, the valve stem and valve body move smoothly, and the driving force of the movable core is small, so the solenoid can be made smaller.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of an emergency shut-off valve according to the present invention, FIG. 2 is a cross-sectional view showing the valve in a closed state, and FIG. 3 is a cross-sectional view of an emergency shut-off valve according to the prior art. 1: Emergency shutoff valve, 2: Valve mechanism section, 3: Holding mechanism section, 20: Valve body, 24: Valve seat, 25: Valve body, 2
6: Valve stem, 27: Diaphragm, 28: Spring, 3
1: Mounting member, 32: Stopper, 33: Ball holder, 34: Ball, 35: Small diameter section, 36: Large diameter section, 37: Tapered section, 40: Solenoid, 4
1: Coil, 42: Fixed core, 43: Movable core,
44: Spring, 45: Small diameter part, 46: Large diameter part, 4
7: Tapered part.

Claims (1)

[Scope of utility model registration request] A valve body having two ports that can communicate with each other through a valve port and a valve seat formed at an open end of the valve port, a valve body that has a periphery connected to a diaphragm and is engageable with the valve seat, It has a spring that presses the valve body to the closed state, and a solenoid that can operate the movable iron core by energizing the coil.The valve body is held open and the open state is released by energizing the coil. an emergency shutoff valve comprising a holding mechanism, the holding mechanism includes a sleeve-shaped ball holder fixed to the valve body above the valve body; and a sleeve-shaped ball holder fixed to the valve body above the valve body; A plurality of balls having a diameter larger than the wall thickness of the ball holder, and a stopper connected to the valve body and movably provided outside the ball holder and having portions with different large and small inner diameters, An emergency shutoff valve characterized in that a movable iron core is movably disposed within the ball holder, and the movable iron core is provided with a small diameter portion that allows the ball to move in a radial direction.