JPH1194114A - Emergency interruption actuator for valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an emergency valve interruption actuator employing a clutch mechanism which brakes when an exciting coil is not carried a current and keeps a power spring in pressure accumulation condition. SOLUTION: In this emergency valve interruption actuator, a liner 55 which rotates integrally with an extending shaft 32 and freely slides axially of the extending shaft 32 is provided on the extending shaft 32 of a rotation shaft 31 of a motor 3, a clutch mechanism 5 consisting of an adsorption plate 53, which is adsorbed against restitutive force of a spring 57 by carrying a current to a core 52 and its exciting coil, and a brake plate 56 for inhibiting rotation of the liner 55 is placed on the liner side, and when the core is not exited, the liner 55 is structured to be pressed onto the brake plate 56 by an adsorption plate 53 energized by the spring 57.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve emergency shut-off actuator which closes a valve whose valve body is open by the restoring force of an emergency spring.

[0002]

2. Description of the Related Art An emergency shut-off actuator for a valve in which a valve whose valve body is open is closed by the restoring force of an emergency spring is used.

In the valve emergency shut-off actuator shown in FIG. 6, an output shaft 2 for driving a valve V is provided in a casing 1, a motor 3 for rotating the output shaft in a direction in which the valve opens, and a valve opening. It has a structure in which a spring 4 that is wound during operation and stores a restoring force and a clutch mechanism 5 that prevents unwinding of the spring are provided. The clutch mechanism 5 is a boss fixed to an extension shaft 32 of a rotation shaft 31 of the motor 3. A suction plate 5c, which is connected to the excitation coil 5d by energizing the excitation coil 5d, is connected to the attraction plate 5c via a leaf spring 5b. And the extension shaft 32, that is, the rotation shaft 31 of the motor 3 is fixed.

The detailed structure of the entire actuator except for the structure of the clutch mechanism 5 is described below.
The gear 6 meshing with the gear 33 fixed to the first shaft 1 is connected to a rotating shaft 41 to which the inner end of the spring 4 whose outer end is fixed to a part of the casing 1 is fixed. 4
It is attached via a one-way clutch 61 so as to be able to rotate freely in the opposite direction, integrally with 1,
The gear 8 meshed with the gear 7 fixed to the rotating shaft 41 is fixed to the output shaft 2.

When the valve V is closed and the core 5e of the clutch mechanism 5 is holding the suction plate 5c, that is, the brake is working and the rotating shaft 31 of the motor 3 is fixed, the output shaft 2 is integrated. When the handle 21 is rotated in the direction in which the valve V closes, the valve body of the valve rotates in the opening direction, and at the same time, the gear 8 integral with the output shaft 2 rotates, and the gear 7 integral with the rotating shaft 41 meshed with the gear 8. Rotates and the spring 4
Is wound.

At this time, the gear 6 meshing with the gear 33 fixed to the rotating shaft 31 of the motor 3 is fixed by the braking action of the clutch mechanism 5, but a one-way clutch 61 is provided between the rotating shaft 41 and the gear 6. The rotation shaft 41 can freely rotate in the direction in which the mainspring 4 is wound.

With the valve V open, the handle 21
When the hand is released, the spring 4 attempts to rotate the rotating shaft 41 in the direction opposite to the direction in which the spring 4 is wound by the restoring force. However, the gear 6 is fixed and the action of the one-way clutch 61 causes the rotation in the opposite direction. Since it is not allowed to rotate, the mainspring 4 is maintained in a wound state, that is, a pressure accumulation state.

In this state, the exciting coil 5 of the clutch mechanism 5
When the energization to d is stopped, the suction plate 5c is separated from the core 5e by the restoring force of the leaf spring 51, and the rotating shaft 31 of the motor 3 is in a free state, so that the rotating shaft 41 is rotated by the restoring force of the mainspring spring 4. , The gear 7 integral with the rotating shaft 41 rotates, and the gear 8 meshing with the gear 7 rotates, and the output shaft 2
Rotates in the valve closing direction to close the valve V.

When the valve V is opened by driving the motor 3, the rotation of the rotating shaft 31 rotates the gear 6 meshing with the gear 33, and the rotation of the rotating shaft 41 winds the mainspring spring 4 and simultaneously rotates the gear 7. Gear 8 meshing with
Rotates, the output shaft 2 rotates in the valve opening direction, and the valve V opens.

[0010]

In the case of a conventional actuator employing a clutch mechanism in which the rotation shaft of the motor is brought into a free state by cutting off the current supply to the exciting coil, the liquid or gas in the piping line at the time of a power failure is lost. Although it is effective in a chemical factory or the like that needs to cut off the distribution, there are various problems when used in the following cases.

When it is desired to operate only when an abnormality such as a change in the flow rate of the fluid in the pipe line is detected, or when a disaster such as an earthquake or a fire occurs, the excitation coil of the electromagnet of the clutch mechanism is always energized to bring the spring into a pressure accumulation state. Because it is maintained, it operates in the same way as when an abnormality is detected or a disaster occurs even at the time of a power outage.

In order to keep the mainspring in a pressure-accumulated state, it is necessary to keep the excitation coil of the electromagnet of the clutch mechanism energized at all times, and a battery having a limited capacity must be used as a power source. It cannot be used for emergency shutoff on supply lines or city gas supply lines.

[0013]

SUMMARY OF THE INVENTION The present invention employs a clutch mechanism which can be de-energized, that is, a brake can be applied when the excitation coil is not energized, and the spring can be held in a pressure-accumulated state. It is an object of the present invention to provide an emergency shutoff actuator for a valve which can solve the above-mentioned problems of the prior art.

[0014]

An actuator for emergency shutoff of a valve according to the present invention is provided with an output shaft for driving the valve in a casing, and a motor for rotating the output shaft in a direction to open the valve and a valve. An emergency shut-off actuator for a valve provided with a spring that is wound during an opening operation and stores a restoring force, and a clutch mechanism that prevents unwinding of the spring, rotates integrally with the extension shaft of the rotation shaft of the motor. In addition, a liner that slides freely is provided in the axial direction of the extension shaft, and the rotation of the suction plate and the liner is attracted against the restoring force of the spring by energizing the core and the exciting coil of the core on the liner side. A clutch mechanism comprising a brake plate for preventing the liner, and when the core is not excited, the liner is urged by the spring. It is characterized in that it has configured to press the brake plate by adsorption plate for.

[0015]

When the core of the clutch mechanism is not energized, the spring is held in an accumulating state, and the restoring force of the spring is released by energizing the exciting coil.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described specifically with reference to the drawings. 1 is a side view showing a state in which an actuator for emergency shutoff of the valve of the present invention is attached to the valve. FIG. 2 is a vertical side view showing the internal structure of the actuator. FIG. 3 is a vertical side view of a clutch mechanism in a non-excited state. 4 is a longitudinal sectional side view of the clutch mechanism in an excited state, and FIG. 5 is a transverse sectional view taken along line AA of FIG.

Reference numeral 1 denotes a casing constituting an actuator, and 2 denotes an output shaft for driving the valve V, to which a manual handle 21 is fixed. Reference numeral 3 denotes a motor having a rotating shaft 31, and 4 denotes a mainspring wound around the handle 21 or the motor 3. The outer end is fixed to a part of the casing 1 and the inner end is fixed to the rotating shaft 41. 5
Is a non-excitation actuating clutch mechanism that prevents the spring 4 from rewinding and holds the spring 4 in a pressure accumulated state.
A core 52 that is excited by energizing the excitation coil 51, a suction plate 53 that is attracted by the excitation of the core, and a boss 54 that is fixed to the extension shaft 32 rotate together with the core 52, and slide freely in the axial direction of the extension shaft 32. The liner 55 includes a movable liner 55, a brake plate 56 for preventing rotation of the liner, and a spring 57 for pressing the liner 55 in the direction of the brake plate 56 via the suction plate 53.

The suction plate 53 is formed by connecting the brake plate 56 to the core 52.
58 are guided vertically by shafts 58... 58, and are evenly pushed by springs 57... 57 inserted into holes formed in the core 52.

Reference numerals 6, 7, and 8 denote gears that operate in the same manner as the gears used in the conventional actuator.

Reference numeral 9 denotes an inertia plate attached to the upper end of the extension shaft 32 of the motor 3 via a one-way clutch 91. The inertia plate 9 absorbs the rotational energy of the gear and the rotating shaft at the time of rewinding the mainspring 4 and cannot rotate the gear. It acts to prevent damage due to the application of force, and when braking is applied while the inertial plate 9 is rotating, the brake plate 56 of the liner 55
The wear of the liner 55 due to contact with the inertia plate 9 due to the one-way clutch 91 can be prevented.

When the valve V is closed, the core 52 of the clutch mechanism 5 is in a non-excited state, that is, when the suction plate 53 is in the state of
7, the rotary shaft 31 of the motor 3 is fixed while the liner 55 is pressed against the brake plate 56, and the handle 21 integrated with the output shaft 2 is rotated in the direction in which the valve V closes. Then, at the same time as the valve body of the valve rotates in the opening direction, the gear 8 integral with the output shaft 2 rotates, and the gear 7 integral with the rotating shaft 41 meshing with the gear 8 rotates to wind the spring 4.

At this time, the gear 6 meshing with the gear 33 fixed to the rotating shaft 31 of the motor 3 is fixed by the braking action of the clutch mechanism 5, but a one-way clutch 61 is provided between the rotating shaft 41 and the gear 6. Intervenes, and the rotating shaft 41
Can rotate freely in the direction in which the mainspring 4 is wound.

With the valve V open, the handle 21
When the hand is released, the spring 4 attempts to rotate the rotating shaft 41 in the direction opposite to the direction in which the spring 4 is wound by the restoring force. However, the gear 6 is fixed and the action of the one-way clutch 61 causes the rotation in the opposite direction. Since it is not allowed to rotate, the mainspring 4 is maintained in a wound state, that is, a pressure accumulation state.

In this state, the exciting coil 5 of the clutch mechanism 5
When the motor 2 is energized, the suction plate 53 is attracted to the core 52 by the restoring force of the spring 57, and when the runner 55 becomes free as shown in FIG. 4, the rotating shaft 31 of the motor 3 is in a free state. The shaft 41 rotates by the restoring force of the mainspring 4, the gear 7 integral with the rotating shaft 41 rotates, the gear 8 meshing with the gear 7 rotates, the output shaft 2 rotates in the valve closing direction, and the valve V To close.

When the valve V is opened by driving the motor 3, the excitation coil 52 of the clutch mechanism 5 is energized to disengage the clutch. When the motor 3 is energized and driven, the rotation of the rotating shaft 31 meshes with the gear 33. Gear 6 rotates,
When the rotating shaft 41 rotates, the mainspring spring 4 is wound, and at the same time, the gear 8 meshing with the gear 7 rotates to rotate the output shaft 2 in the valve opening direction and open the valve V.

[0026]

According to the valve emergency shut-off actuator according to the present invention, the brake is applied when the excitation coil is not energized, that is, when the excitation coil is not energized, and the mainspring is held in a pressure-accumulated state. If you want to operate only when an abnormality such as a change in the flow rate of fluid in the piping line is detected or when an earthquake or fire is a disaster, use an abnormality detector or an earthquake or fire alarm. If the excitation coil of the clutch mechanism can be energized by a signal from the controller, the same operation as that at the time of abnormality detection or at the time of disaster unlike a conventional actuator will be avoided.

It is only necessary to supply current to the excitation coil when an abnormality is detected or during a disaster, so that a water supply line or a city gas supply line in a mountainous area where power cannot be secured can be used for emergency shutoff only by providing an emergency battery. And unattended safety management is also possible.

Further, in a chemical factory or the like where it is necessary to cut off the flow of liquid or gas in the piping line at the time of a power failure, simply providing an electric circuit capable of supplying electricity from the emergency battery to the exciting coil simultaneously with the power failure is provided. That can be dealt with.

According to the second aspect of the present invention, since the inertia plate is attached to the extension shaft of the rotation shaft of the motor via a one-way clutch, the rotation energy of the gear and the rotation shaft at the time of rewinding of the mainspring is absorbed into the gear. It is possible to prevent damage due to excessive force and to prevent the liner from being worn due to contact between the liner and the brake plate when braking is applied while the inertia plate is rotating. .

[Brief description of the drawings]

FIG. 1 is a side view showing a state in which an emergency shutoff actuator of a valve of the present invention is attached to a valve.

FIG. 2 is a vertical sectional side view showing an internal structure of an actuator.

FIG. 3 is a longitudinal sectional side view of the clutch mechanism in a non-excited state.

FIG. 4 is a longitudinal sectional side view of the clutch mechanism in an excited state.

FIG. 5 is a transverse sectional view taken along line AA of FIG. 4;

FIG. 6 is a vertical sectional side view showing the internal structure of a conventional actuator.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Casing 2 ... Output shaft 3 ... Motor 4 ... Spring spring 5 ... Clutch mechanism

Claims (2)

[Claims] An output shaft for driving a valve is provided in a casing, a motor for rotating the output shaft in a direction to open the valve, a spring wound around the valve when the valve is opened, and a restoring force stored therein. In an emergency shutoff actuator for a valve provided with a clutch mechanism for preventing rewinding, a liner that rotates integrally with the extension shaft of the rotation shaft of the motor and that slides freely in the axial direction of the extension shaft. At the same time, a clutch mechanism is provided on the liner side, the clutch mechanism comprising a core and a suction plate that is attracted against the restoring force of the spring by energizing the excitation coil of the core and a brake plate that prevents rotation of the liner. The liner is pressed against the brake plate by a suction plate urged by the spring when the motor is not excited. Actuator for emergency shutoff of valve. 2. The actuator for emergency shutoff of a valve according to claim 1, wherein an inertia plate is attached to an extension shaft of the rotation shaft of the motor of claim 1 via a one-way clutch.