JPH10132117A - Emergency shut-off device for valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To close a valve completely in an emergency case such as fire and an earthquake by forming a valve so as to be closed by winding a power spring in the extension of the opening movement of the valve by a handle and opening the restoring force with a signal from a detector. SOLUTION: During a valve is being closed, a gear 4 engaging with a warm gear 31 by the operation of a handle turns, and gears 5... engaging with a small-diameter gear 41 integral with the gear 4 turn. The gears 5... revolves around an output shaft 2 while engaging with the inner periphery teeth 71... of an internal gear 7, therefore, the output shaft 2 integral with a plate 6 turns to open the valve. When the handle is turned further, a rotating shaft 81 integral with a gear 82 turns, so that a power spring 8 is wound to accumulate its power. When a signal from an earthquake detector or the like energizes an electromagnetic brake 10 under this condition, the rotating shaft 81 is turned reversely by the returning force of the power spring 8, and the output shaft 2 turns reversely, so that the valve is closed urgently.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve which can be automatically closed by a signal from a sensor in the event of an emergency such as a fire or an earthquake, after the valve is manually opened and a spring is wound. The present invention relates to an emergency closing device.

[0002]

2. Description of the Related Art Heretofore, there has been a valve emergency closing device which can automatically close a valve in response to a signal from a sensor in an emergency such as a fire or an earthquake.

[0003]

In a conventional device of this type, the driving force of a motor is used to open and close a valve, and the valve is closed by a restoring force of a mainspring when emergency closing is required. However, the main valve that supplies flammable gas is used with the valve open except in the rare case of an emergency, so the driving force of the motor is used to open and close the valve. However, there is a problem in that the actuator itself becomes very expensive, and piping work and other equipment costs become expensive.

[0004]

An object of the present invention is to solve the above-mentioned problems of the prior art by manually opening a valve with a handle, rotating the handle as it is after the valve is opened, and winding the spring to rotate the spring. It is an object of the present invention to provide a valve emergency closing device that closes a valve by a restoring force of a mainspring.

[0005]

An emergency closing device for a valve according to the present invention is provided with an output shaft connected to a rotating shaft of a valve body of a valve in a casing, and manually opening the output shaft to open the valve. In the valve actuator, the gear meshing with the worm gear which is rotated by operating the handle is pivotally supported on the output shaft so as to be freely rotatable, and the gear meshing with the small-diameter gear is integrally rotatable with the output shaft. A plate having a shaft pivotally attached to the output shaft is fixed to the output shaft, and an internal gear provided with inner peripheral teeth meshing with the gear is pivotally supported on the output shaft so as to freely rotate, and a rotation for winding a mainspring spring. A housing fixed to a shaft and a casing for accommodating the mainspring is provided, and an inner end and an outer end of the mainspring are fixed to a part of the rotating shaft and a part of the housing, respectively. The gear rotating in mesh with the outer peripheral teeth fixed to the rotary shaft, to prevent the rotation of the rotary shaft when energized blocking and is characterized by comprising an electromagnetic brake that allows rotation of the rotating shaft when energized.

[0006]

The spring is wound by extending the opening operation of the valve, and the restoring force of the spring is released by a signal from the sensor to close the valve.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described specifically with reference to the drawings. FIG. 1 is a front view of a valve to which the device of the present invention is attached, FIG. 2 is a vertical sectional side view of the device, and FIG. 3 is a perspective view showing an internal structure of the device.

Reference numeral 1 denotes a casing incorporating the device of the present invention. An output shaft 2 connected to the rotation shaft of the valve body of the valve A is provided in the casing 1, and the output shaft 2 is manually rotated to rotate the valve. This constitutes an actuator that opens A.

Reference numeral 3 denotes a handle for manual operation, and a worm gear 31 which rotates by operating the handle 3.
Is rotatably supported on the output shaft 2 so as to freely rotate.

Reference numeral 5 denotes a plurality of gears which are integral with the gear 4 and mesh with a gear 41 having a smaller diameter than the gear 4.
The shafts 51... 51 for pivotally supporting.
Is fixed to a disk-shaped plate 6 fixed to the plate.

Reference numeral 7 denotes inner peripheral teeth 71 meshing with the gears 5.
71, wherein the output shaft 2
It is pivotally supported to freely rotate.

Reference numeral 8 denotes a mainspring. The inner end of the mainspring is a rotating shaft 8 having both ends supported by bearings.
An outer end is fixed to a housing 9 which is fixed to a casing 1 which houses the spring.

Reference numeral 82 denotes a gear fixed to the rotating shaft 81 and rotated by meshing with the outer peripheral teeth 72... 72 of the internal gear 7.

Reference numeral 10 denotes an electromagnetic brake that prevents rotation of the rotating shaft 81 when power is cut off and allows rotation of the rotating shaft 81 when power is turned on. The electromagnetic brake is energized by a signal from a detector such as a fire detector or an earthquake detector. The electromagnetic brake 10 and the rotating shaft 81
A one-way clutch a is interposed between them so that the rotating shaft 81 can rotate in the direction in which the mainspring 8 is wound even when the power is cut off.

In the figure, LS1 and LS2 are limit switches for detecting that the valve A has been opened or closed due to the rotation of the output shaft 2, and S indicates a rotational force which is greater when the valve A is opened or closed. This is a stopper that does not apply water to the valve.

Next, the operation of the apparatus of the present invention will be described with reference to the illustrated embodiment in accordance with the above-described configuration of the present invention.

When the valve A is closed, the handle 3
Is rotated in the direction in which the valve A is released, the worm gear 31 integral with the handle rotates, the gear 4 meshing with the worm gear 31 rotates, and the gear 5 meshing with the small-diameter gear 41 integral with the gear 4. ... 5 rotates.

The gears 5... Mesh with the inner peripheral teeth 71... 71 of the internal gear 7 and try to rotate the internal gear 7 by the rotation of the gears 5. Since the torque for rotating the valve A in the opening direction is smaller than the torque for winding the mainspring 8, the gears 5.
The plate 6 on which the shafts 51... 51 of the gears 5.
Swings, the output shaft 2 integral with the plate 6 rotates, and the valve body of the valve A connected to the output shaft 2 rotates to open the valve.

When the valve A is fully opened and the rotation of the output shaft 2 is stopped by the stopper S, the turning of the plate 6 is also stopped. Therefore, when the handle 3 is further turned and the gears 5. The null gear 7 starts rotating.

When the internal gear 7 starts rotating, the gear 82 meshes with the outer peripheral teeth 72... 72 of the internal gear 7.
Rotates.

The rotating shaft 81 is driven by the one-way clutch a even when the electromagnetic brake 10 is turned off.
Since 1 can rotate in the direction in which the mainspring 8 is wound, the rotation shaft 81 rotates integrally with the gear 82 to wind the mainspring 8.

When the mainspring 8 is sufficiently wound, the torque applied to the handle 3 increases, and it is determined that the mainspring 8 is sufficiently wound.

Since the rotating shaft 81 does not reversely rotate due to the action of the one-way clutch a, it is restrained until the electromagnetic brake 10 is energized, and the accumulated pressure is maintained.

In this state, when a detector such as a fire detector or an earthquake detector is operated and a signal is output, the electromagnetic brake 10 is energized by this signal, the restraint of the rotating shaft 81 is released, and the rotating shaft 81 is released. 81 is the restoring force of the mainspring 8 and starts to rotate in the direction opposite to the direction in which the mainspring 8 is wound.

The rotation of the rotating shaft 81 causes the gear 82 to rotate in the reverse direction, and the internal gear 7 rotates in the direction opposite to the above-mentioned direction. Therefore, the gears 5 meshing with the inner peripheral teeth 71 of the internal gear 7 are formed. 5 rotates.

When the gears 5... 5 rotate, the gear 4 meshing with the worm gear 31, that is, the gear 41, is in a fixed state, so that the gears 5. And the output shaft 2 integral with the plate 6 rotates to close the valve A.

When the emergency situation is released and the normal state is restored, the handle 3 is operated again to open the valve, and the mainspring 8 is wound to prepare for the next emergency situation.

[0028]

According to the emergency closing device for a valve according to the present invention, the valve is manually opened, and the mainspring for emergency closing is wound by extending the opening operation of the valve. As described above, the present invention does not require an expensive motor, can be manufactured at low cost, and can reduce the size of the entire apparatus.

In this embodiment, the one-way clutch is interposed between the rotating shaft around which the mainspring is wound and the electromagnetic brake for regulating the rotation, but the electromagnetic brake is automatically energized when the valve is closed. Alternatively, a mechanism may be employed in which the restraint on the rotating shaft is temporarily released, and after the mainspring has been wound, the power is automatically cut off to restrain the rotating shaft.

[Brief description of the drawings]

FIG. 1 is a front view of a valve to which the device of the present invention is attached.

FIG. 2 is a vertical sectional side view of the same device.

FIG. 3 is a perspective view illustrating an internal structure of the device.

[Explanation of symbols]

 Reference Signs List 1 casing 2 output shaft 3 handle 31 worm gear 4 gear 5 gear 6 plate 7 internal gear 8 mainspring 9 housing 10 electromagnetic brake

Claims (1)

[Claims] A valve actuator in which an output shaft connected to a rotation shaft of a valve body of a valve is provided in a casing and the valve is opened by manually rotating the output shaft. The gear 4 meshing with the worm gear 31 rotating by the operation 3 is pivotally supported on the output shaft 2 so as to freely rotate, and the gears 5. Pivot shaft 51 ... 51
Is fixed to the output shaft 2 and the gear 5
The internal gear 7 provided with inner peripheral teeth 71 meshing with... 5 is rotatably supported on the output shaft 2, and a rotary shaft 81 for winding a mainspring 8 and a mainspring 8.
A housing 9 fixed to the casing 1 for housing
The inner end and the outer end of the mainspring 8 are fixed to a part of the rotating shaft 81 and a part of the housing 9, respectively, and the gear 82 which rotates by meshing with the outer teeth 72. An emergency closing device for a valve, comprising: an electromagnetic brake 10 that is fixed and prevents rotation of the rotary shaft 81 when power is cut off, and permits rotation of the rotary shaft 81 when power is turned off.