JPS5838202Y2 - Valve opening/closing control device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a valve opening/closing control device that can automatically close butterfly valves, ball valves, etc. in the event of a power outage.

A valve opening/closing control device that can automatically close the valve when a power outage occurs has already been proposed (Japanese Patent Application Laid-Open No. 111224/1983).

However, with this conventional control device, the repulsive force of the spring is directly applied to automatically close the door.
The closing speed of the valve at closing is too fast, water merging is likely to occur, and the conventional valve is 0N-O for transmitting rotational force.
Since an electromagnetic clutch is used in the FF arm, the rotational force transmission mechanism and the locking mechanism for opening the valve are complicated, resulting in an increase in manufacturing costs.

In view of these points, the present invention has a simple structure that automatically closes the valve immediately in the event of a power outage, and also allows the valve closing speed at automatic closing to be freely adjusted, thereby preventing the occurrence of water hammer. The purpose of the present invention is to provide a pulp opening/closing control device that prevents this from occurring, and its features are that a rotating arm is attached to the opening/closing operating shaft of the valve, and the tip of this rotating arm is connected to the operating rod. , the valve is opened and closed as the operating rod moves linearly in its axial direction, and a threaded rod is connected in series to one end of the operating rod via a slat joint;
This screw rod can be rotated by a suitable rotational drive device such as an electric motor, and a half nut is provided to be screwed onto the screw rod, and this half nut is opened and closed by a solenoid. The half nut is screwed into the screw rod by the action of the solenoid, and the half nut is separated from the screw rod in the event of a power outage.Furthermore, a cylinder with a throttle valve is attached to the tip of the operating rod, and the inside of this cylinder is A spring is installed in the valve, and when the no-fnant comes off the threaded rod during a power outage and the operating rod becomes free, the action of the spring moves the operating rod and automatically opens the valve. In addition, the valve is closed at a desired closing speed at which water hammer does not occur.

The present invention will be explained below with reference to the embodiments shown in the drawings.

Reference numeral 1 denotes a valve opening/closing operation shaft, and the valve can be opened/closed by rotating this opening/closing operation shaft about 90 degrees.

A rotating arm 2 is integrally attached to the opening/closing operation shaft 1, and by rotating the rotating arm 2, the opening/closing operation shaft 1 is rotated in conjunction.

Furthermore, a long groove 3 is formed at the tip of the rotating arm 2.

Reference numeral 4 denotes an operating rod, which can move linearly along its axis.

A pin 5 is attached to the operating rod 4, and the pin 5 is fitted in the long groove 3 of the rotating arm 2.

Therefore, when the operating rod 4 moves linearly, the rotating arm 2 rotates together with the opening/closing operation shaft 1.

A screw rod 7 is connected in series to one end of the operating rod 4 via a thrust joint 6.This screw rod 7...
The nut 8 is screwed together.

The half nut 8 is opened and closed by a twist/id 9, and when the solenoid 9 is energized, the half nut 8 closes and engages with the threaded rod 7, and on the contrary, when the solenoid 9 is deenergized. When the half nut 8 is bent, it opens and separates from the threaded rod 7.

The twisted screw rod 7 can be rotated by a suitable rotary drive device such as an electric motor 10.

Therefore, when the screw rod 7 is rotated, the screw rod 7 will rotate under normal conditions.
Since the half nut 8 is screwed into the valve, the threaded rod 7 moves in a linear direction together with the operating rod 4, and the valve can be opened and closed.

Further, when the electric motor 10 stops, the screw rod 7 is self-locked by screwing into the half nut 8.

Further, since a thrust joint is interposed between the threaded rod 7 and the operating rod 4, rotation of the threaded rod T is not transmitted to the operating rod 4, but only linear movement is transmitted.

11 is a disk-shaped switch operation piece attached to the screw rod 7, 12.13 is a limit switch, the screw rod 7 moves linearly, and the switch operation piece 11 is a limit switch 12.1.
3, the electric motor 10 stops.

Therefore, this switch operation piece 11 and the limit switch 1
2.13 serves to define both ends of the stroke when the threaded rod 7 moves in the axial direction.

Further, a cylinder 14 is installed at the opposite end of the operating rod 4, and the end of the operating rod 4 is connected to a piston 1 of the cylinder 14.
It is fixed at 5.

A spring 16 is provided in the cylinder 14 between the piston 15 and the end wall of the cylinder, and the spring 16
5 is constantly applied with a force to move the operating rod 4 in the valve closing direction.

As the cylinder 14, an oil cylinder is normally used.

However, depending on the situation, it is also possible to use an air cylinder.

A through hole 17 and an oil inlet 18 are provided at both ends of the cylinder 14, respectively.
and is provided.

In addition, a throttle valve 2 is provided in the oil passage pipe 20 connected to the oil passage hole 18.
1 and a check valve 22 are provided in parallel, and the throttle valve 21
By adjusting this, the moving speed of the piston 15 when the piston 15 moves by the force of the spring 16 can be adjusted, thereby making it possible to prevent water hammer that occurs when the valve is closed.

Next, the operation of the above device will be explained.

First of all, under normal conditions, solenoid 9 is energized, so
The half nut 8 is closed and screwed into the screw rod 7.

Therefore, the threaded rod 7 can move in the linear direction only when rotation is applied.

As a result, by rotating the electric motor 10 in either the forward or reverse direction, the threaded rod 7 rotates and moves in a linear direction, and this linear movement of the threaded rod I is transmitted to the operating rod 4, causing the valve to operate. The valve can be opened and closed by rotating the opening/closing operation shaft 1.

Note that normally, the rotation control of the electric motor 10 is automatically performed depending on the water level of the water tank.

Next, we will discuss what happens during a power outage.

In the event of a power outage, the power to solenoid 9 will be cut off.
Therefore, the solenoid 9 returns to its original position by the force of the built-in spring, and the half nut 8 opens and separates from the threaded rod 1.

When the half nut 8 is separated, there is no longer anything to lock the threaded rod 7, so that the threaded rod 7 can move freely in the linear direction.

Then, the spring 16 in the cylinder 14 acts, and its repulsive force causes the piston 15 to move.

Note that this movement of the piston 15 is performed at a relatively slow speed due to the action of a throttle valve 21 connected to the oil passage hole 18.

Further, since the actuating rod 4 is connected to the piston 15 that moves in this manner, the actuating rod 4 moves as the piston 15 moves, and rotates the opening/closing operation shaft 1 to close the valve.

Therefore, in the event of a power outage, the valve will be automatically closed.

When the power outage ends, the solenoid 9 is energized again, so the half nut 8 is closed and the valve can be opened and closed by rotating the electric motor 10.

Therefore, the return to the normal state at the end of the power outage is automatically performed.

As described above, the device of the present invention can freely open and close the valve by operating a rotary drive device such as an electric motor during normal times, and can also automatically close the valve using the repulsive force of the spring in the event of a power outage. .

In addition, in the device of the present invention, the screw rod I and the half nut 8 convert rotational force into axial force.
fMl, the mechanism is structurally simple, reliable in operation, and has excellent locking performance in the valve open state.

Furthermore, in the present invention, a cylinder 14 is provided at the end of the operating rod 4, and a throttle valve 21 is attached inside the cylinder, so that the valve closing speed during automatic closing due to the repulsive force of the spring can be freely adjusted. can prevent the occurrence of water hammer.

Furthermore, the present invention is easy to manufacture, can be installed compactly, and is easy to handle because the mechanism automatically returns to its normal state when a power outage ends.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a schematic partial cross-sectional view showing a normal state, and FIG. 2 is a schematic diagram of a state during a power outage. 1... Valve opening/closing operation shaft, 2... Rotating arm, 3... Long groove, 4... Operating rod, 5
...Pin, 6...Thrust joint, 7.
...Screw rod, 8...Half nut, 9.
... Solenoid, 10 ... Electric motor, 14
...Cylinder, 15 ...Piston, 1
6...Spring, 17...Through hole, 18...
...Oil hole, 20...Oil pipe, 21...
... Throttle valve, 22 check valve.

Claims (1)

[Scope of utility model registration request] A rotating arm 2 is attached to the opening/closing operation shaft 1 of the valve, and the tip of the rotating arm 2 is connected to an operating rod 4 that can move linearly in the axial direction, so that as the operating rod 4 moves in the axial direction, The valve is made to open and close, and the screw rod 7 is connected to the broken operating rod 4 via the thrust joint 6, and this screw rod 7
A rotary drive device is connected to the screw rod I, and a nut 8 is provided, and a solenoid 9 is attached to the half nut 8, so that when the power to the solenoid 9 is cut off, the half nut is activated. 8 is opened and removed from the threaded rod 7, and a piston 15 is attached to the tip of the twisted operating rod 4, and the piston 15 is attached to the cylinder 1.
The cylinder 14 is configured to be a fluid cylinder for oil or air, and a throttle valve 21 is attached to the cylinder 14, and a spring 16 is attached to the cylinder 14 so that the piston 15 The valve opening/closing control device is characterized in that a force is applied to the operating rod 4 to cause the valve to close and move in the direction of closing and closing the valve by the repulsive force of the knob 16.