JPH08261347A - Operating device for emergency cutoff valve - Google Patents

Abstract

PURPOSE: To provide an operating device for an emergency cutoff valve which is so constituted as to use a coil spring as a power, reduce size and weight, and improve an earthquake resisting strength. CONSTITUTION: A coil spring 4 is attached to a drive shaft 1 and energized in an axial direction. A drive shaft 1 and an output shaft 11 are intercoupled through a transmission mechanism 10. The outside of the drive shaft 1 is surrounded with a hydraulic cylinder 21 and oil is fed therein with the aid of a hand pump 22. A lock lever 35 is forced into contact with the drive shaft 1 to lock the drive shaft, and during normal operation, the lock lever is held in an sunken state. During the occurrence of an earthquake, the lock lever 35 is separated, and the drive shaft 1 is protruded and moved through the force of the coil spring 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an actuating device for an emergency shutoff valve attached to a water tank for earthquake prevention.

[0002]

2. Description of the Related Art In an earthquake countermeasure water storage tank, an emergency shutoff valve is installed in a pipe line between the water storage main pipe and the water supply main pipe to shut off the water pipe when the earthquake occurs. It is designed to prevent sewage from flowing into or from the mains of the water distribution into the water tank. The emergency shutoff valve is provided with an actuating device that senses an earthquake and automatically closes the valve. Although such an actuating device has been already proposed, its structure is generally a weight type,
When an earthquake occurs, the valve is closed by using the descent force of the weight.

[0003]

However, in the conventional weight type actuating device, since a weight of a considerable weight must be held in a descentable state, the mechanical structure has a problem in seismic resistance. . Because, if the strength of the weight support part is low, it may be damaged during a strong earthquake. On the contrary, if the strength of the support part is increased, the actuating device inevitably becomes large in size. is there.

In view of the above points, the present invention provides an emergency shutoff valve actuating device which has an improved seismic strength by eliminating the weight method. Further, the present invention is to provide a lightweight and compact actuating device in which an automatic valve closing drive device for an emergency and a manual valve opening and returning device are integrally incorporated.

[0005]

The technical means of the actuator device for an emergency shutoff valve according to the present invention comprises a drive shaft movable in the axial direction,
A power generation mechanism that applies an axial force to the drive shaft with a coil spring, a transmission mechanism that transmits the axial movement of the drive shaft to the output shaft as a rotational force, and a return mechanism that hydraulically applies a return force to the drive shaft. , And a lock mechanism that holds and holds the drive shaft in the retracted position.

Further, as the lock mechanism, one having a solenoid which operates when an earthquake occurs, a locking lever which releasably abuts on the drive shaft, and a lever link mechanism which connects the solenoid and the locking lever is used. May be.

Further, as the return mechanism, a mechanism including a hydraulic cylinder surrounding the drive shaft and a hand pump for feeding oil to the hydraulic cylinder may be used.

[0008]

In the actuating device of the present invention, the movement of the drive shaft in the axial direction is transmitted to the output shaft as a rotational force via the transmission mechanism. Therefore, when the drive shaft moves, the output shaft rotates, the valve rod of the emergency shutoff valve connected to the output shaft rotates, and the valve opens and closes. Power for moving the drive shaft is applied from the coin spring, and when the lock of the drive shaft is released, the drive shaft automatically moves in a protruding manner by the pressing force of the spring.

When the locking lever of the lock mechanism contacts the drive shaft, the drive shaft is locked and held in the retracted position.
Then, when the lock by the locking lever is released when an earthquake occurs, the drive shaft projects and moves to rotate the output shaft.
Further, when oil is fed to the hydraulic cylinder of the return mechanism, the drive shaft moves in the retracted direction against the force of the coil spring.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an actuating device of the present invention will be described with reference to the drawings. Reference numeral 1 is a drive shaft, which is provided so as to be movable in the axial direction. A power generation mechanism 2 has a coil spring 4 housed inside a spring case 3 which is fixed and supported. The spring 4 is interposed between the drive shaft 1 and the spring case 3, and applies a force to the drive shaft 1 in the protruding direction (left side in the drawing). 5 is a spring seat fixed to the case 3, 6 is a drive shaft 1
Is a spring seat fixed to, and 7 is an intermediate spring seat. Reference numeral 8 is a stopper attached to the end of the drive shaft 1.

A transmission mechanism 10 is provided adjacent to the power generation mechanism 2. An output shaft 11 is rotatably provided and is connected to a valve rod of an emergency shutoff valve (not shown). Therefore, the rotation of the output shaft 11 opens and closes the emergency shutoff valve. A lever 12 is integrally fixed to the output shaft 11 as shown in FIG. 3, and a pin 14 attached to the drive shaft 1 is fitted in a vertical groove 13 of the lever. Therefore, when the drive shaft 1 linearly moves in the axial direction, the lever 12 moves and the output shaft 11 rotates.

Reference numeral 20 denotes a return mechanism, which is provided adjacent to the transmission mechanism 10. 21 is a hydraulic cylinder into which high pressure oil is fed by a hand pump 22.
Since the drive shaft 1 has the step portion 23, when the oil is press-fitted, the drive shaft 1 is moved in the retracted direction (right side in the drawing). On the contrary, when the drive shaft 1 is projected and moved by the coil spring 4, the oil returns from the hydraulic cylinder 21 to the hand pump 22.

In the embodiment, the hand pump 22 is attached to the outer wall of the spring case 3, and the hand pump 22 and the hydraulic cylinder 21 are connected by a pipe 24. Further, a flow rate adjusting valve 25 is provided in this oil passage to adjust the flow rate of the oil when returning from the hydraulic cylinder 21 to the hand pump 22, and to adjust the moving speed of the drive shaft 1 during the projecting operation. It is like this. Reference numeral 26 is an oil passage switching valve provided in the hand pump 22.

A lock mechanism 30 is engaged with the tip of the drive shaft 1 to lock and hold the drive shaft 1 in a retracted state. Reference numeral 31 is an electromagnetic solenoid which is actuated by an electric signal from the seismic detector 32 to pull up the pawl lever 33. Claw lever 33
The fan-shaped lever 34 is hooked and held by the fan-shaped lever 34, and when the pawl lever 33 is pulled up, the fan-shaped lever 34 can be rotated. Reference numeral 35 is a locking lever, the tip of which engages and locks the end of the drive shaft 1. The other end of the locking lever 35 and the fan-shaped lever 34 are connected by a link 36. Furthermore,
A tension spring 37 is provided at the connecting portion between the fan-shaped lever 34 and the link 36.
Is attached to the fan-shaped lever 34 so as to apply return turning power.

FIG. 1 shows the set state of the actuator.
The drive shaft 1 is in the retracted position, and the lock lever 3 is attached to the tip of the drive shaft 1.
5 are in contact with each other and are prevented from moving in the protruding direction. However, the coil spring 4 constantly applies a force to the drive shaft 1 in the protruding direction. In the lock mechanism 30, since the pawl lever 33 is hooked, the fan-shaped lever 34 cannot rotate, and therefore, the locking lever 3 linked to this is connected.
5 is also non-rotatable and holds the locked state.

When an earthquake occurs, a signal is sent from the sensor 32 to the solenoid 31 and the solenoid 11 operates,
The pawl lever 33 is pulled up and the fan lever 34 is released. As a result, the fan-shaped lever 34 and the locking lever 35 are rotatable, and the locking of the drive shaft 1 is released. Therefore, the drive shaft 1 is moved by the force of the coil spring 4 in the protruding direction as shown in FIG. Then, with this movement, the output shaft 11 rotates 90 °, and the valve rod of the emergency shutoff valve is rotated to close the valve.

Next, to return to the original set state, the hand pump 22 sends oil to the hydraulic cylinder 21. Due to the oil flowing into the cylinder 21, the drive shaft 1 is pushed in the retracted direction against the force of the coil spring. And
The tip of the locking lever 35 is hooked on the end surface of the drive shaft 1, and the fan-shaped lever 34 is returned and rotated by the action of the pulling spring 37 to be automatically hooked on the pawl lever 33. Further, since the output shaft 11 is rotated in the return direction, the emergency cutoff valve is opened.

The present invention is not limited to the above-mentioned embodiments, but can be freely modified and implemented within the scope of the claims. In particular, the transmission mechanism 10 and the return mechanism 2
0, the detailed configuration of the lock mechanism 30 is free.

[0019]

Since the actuating device of the present invention is a type in which the actuating power is obtained from the coil spring, the actuating operation is reliable and the reliability is high, and the weight is smaller than that of the conventional weight type. High earthquake resistance. Further, in the present invention, since the entire unit including the return mechanism is integrated,
Convenient for transportation, installation and handling.

According to the second aspect of the present invention, since the drive shaft is mechanically locked and electrically released, there is no malfunction and the lock holding and releasing operations are reliable, and the structure is simple. There is.

According to the third aspect of the invention, since the drive shaft is returned by hydraulic pressure, the operation can be easily performed manually, and the structure can be simplified.

[Brief description of drawings]

FIG. 1 is a sectional view of an actuating device of the present invention in a locked state.

FIG. 2 is a cross-sectional view of a state where a drive shaft has moved in a protruding manner.

FIG. 3 is a sectional view of a transmission mechanism section.

[Explanation of symbols]

 1 Drive Shaft 2 Power Generation Mechanism 3 Spring Case 4 Coil Spring 5, 6, 7 Spring Seat 10 Transmission Mechanism 11 Output Shaft 12 Lever 13 Vertical Groove 14 Pin 20 Return Mechanism 21 Hydraulic Cylinder 22 Hand Pump 23 Step 25 Flow Control Valve 30 Lock Mechanism 31 Solenoid 32 Earthquake Detector 33 Claw Lever 34 Fan-shaped Lever 35 Locking Lever

Claims (3)

[Claims] 1. A drive shaft that is movable in the axial direction, a power generation mechanism that applies a force in the axial direction to the drive shaft by a coil spring, and a transmission mechanism that transmits the movement of the drive shaft in the axial direction to the output shaft as a rotational force. An emergency shutoff valve actuating device comprising a hydraulic return mechanism that applies a return force to the drive shaft and a lock mechanism that locks and holds the drive shaft in the retracted position. 2. The lock mechanism 30 includes a solenoid 31 that operates when an earthquake occurs, a locking lever 35 that releasably abuts on the drive shaft 1, a solenoid 31, and a locking lever 35.
The actuating device for an emergency shutoff valve according to claim 1, which comprises a lever / link mechanism 33, 34.36 for connecting with. 3. The emergency shutoff valve actuating device according to claim 1, wherein the return mechanism 20 comprises a hydraulic cylinder 21 surrounding the drive shaft 1 and a hand pump 22 for feeding oil to the hydraulic cylinder.