JP5043773B2 - Valve actuator - Google Patents

Description

  The present invention relates to a valve actuator that opens and closes a valve by rotating a valve body by driving a motor and automatically opens or closes the valve when power is cut off due to a power failure or accident.

  An electric valve that opens and closes by rotating the valve body with a motor generally makes the main shaft unrotatable when de-energized so that the valve body does not rotate due to fluid pressure when the motor is de-energized and stopped. The motor (brake motor) provided with the brake mechanism to hold | maintain is used. For this reason, if the motor cannot be energized due to a power outage or accident, etc., the valve body will remain uncontrollable before it is de-energized, making it impossible to adjust the fluid flow rate and causing a secondary accident. There was a risk of triggering.

Thus, in recent years, various valve actuators have been developed that automatically open or close the valve to avoid secondary accidents when power to the motor is interrupted due to a power failure or the like (for example, patent documents). 1 and 2).
JP-A-62-63280 Japanese Utility Model Publication No. 5-52456

  FIG. 9 schematically shows an example of a valve actuator having an emergency opening / closing function as described above. In this valve actuator, an internal gear 53 that is rotated by driving of a motor 52 is arranged around an output shaft 51 that is connected to a rotary shaft C of a valve body B of a valve A. A plurality of planetary gears 54 that mesh with the inner peripheral teeth, and a sun gear 55 that is rotatably attached to the outer periphery of the output shaft 51 and meshes with each planetary gear 54, and a support shaft 56 that passes through each planetary gear 54. One end is connected to a flange portion 51a projecting from the outer periphery of the output shaft 51, and the sun gear 55 is connected to a relay gear 58 disposed above the sleeve 57 through which the output shaft 51 is passed. A clutch 6 that is provided with a hoisting gear 59 that meshes with the relay gear 58 and a spring spring 60 that is wound up by the rotation of the hoisting gear 59 in the positive direction, and is geared to the hoisting gear 59. Accordingly, to prevent the unwinding of the spiral spring 60 when energized, at the time of non-energization is obtained so as to release the blocking effect return spring winding.

  When using this valve actuator, first, in order to wind up the mainspring spring 60, the operation shown in FIG. That is, the stopper plate 62 provided on the output shaft 51 is brought into contact with the fixed stopper member 63 at the fully closed position of the valve A to prevent the output shaft 51 from rotating clockwise, and then the motor 52 is driven in the forward direction. When the internal gear 53 is rotated clockwise, the planetary gears 54 are prevented from rotating clockwise by the support shafts 56 integral with the output shaft 51, so that the sun gear 55 and the relay gear integral therewith are rotated. Since 58 is rotated, the hoisting gear 59 is also rotated and the mainspring spring 60 can be wound up.

  When the winding of the mainspring spring 60 is completed, the mainspring spring 60 is held in an accumulated state by the action of the clutch 61 preventing the mainspring spring 60 from rewinding. In this state, the hoisting gear 59, the relay gear 58 and the sun gear 55 are held unrotatable, so that the motor 52 is driven in the reverse direction to rotate the internal gear 53 counterclockwise as shown in FIG. , Each planetary gear 54 revolves counterclockwise while rotating and pushes the support shaft 56. Therefore, the output shaft 51 and the valve body B rotate counterclockwise, and the valve A is opened. Thereafter, when the motor 52 is driven in the forward direction, the output shaft 51 and the valve body B rotate clockwise and the valve A is closed. That is, the valve A can be opened and closed by driving the motor 52 in this state.

  In addition, if the power interruption due to a power failure or accident occurs during use of this actuator, the spring unwinding preventing action of the clutch 61 is released, so that the spring spring 60 is elastically restored as shown in FIG. The winding gear 59, the relay gear 58, and the sun gear 55 rotate in the direction opposite to that during winding, while being wound back by force. At this time, since the main shaft of the motor 52 is held in a non-rotatable state by the internal brake mechanism, the internal gear 53 is also fixed. For this reason, each planetary gear 54 revolves clockwise and pushes the support shaft 56 as the sun gear 55 rotates, so that the output shaft 51 and the valve body B also rotate clockwise, and the output shaft 51 is fixed stopper. It stops at a position where the member 63 is prevented from rotating (see FIG. 9A). That is, in this actuator, when energization is interrupted, the valve element B is automatically rotated to close the valve A.

  By the way, in recent electric valves, a mechanism that can be manually operated is indispensable in order to meet needs such as improvement in workability during maintenance. On the other hand, in the electric valve incorporating the valve actuator as described above, since it is difficult to add a manual operation mechanism to the actuator, a mechanism for manual operation with the actuator disconnected is provided separately. For this reason, there is a problem that the cost of the entire valve is increased, and it takes time to detach the actuator before and after manual operation.

  The subject of this invention is providing the actuator for valves provided with both the mechanism which opens or closes a valve automatically at the time of electricity supply interruption | blocking, and the manual operation mechanism of a valve.

  In order to solve the above-described problems, the present invention provides a valve actuator that opens and closes a valve by rotating an output shaft connected to a rotating shaft of a valve body of the valve in both forward and reverse directions by driving a motor. A drive gear that is rotated by driving the motor and a sun gear that is connected to the drive gear by a sleeve that passes through the output shaft are rotatably attached to the outer periphery of the output shaft, and the sun gear is provided around the sun gear. A plurality of planetary gears that mesh with each other, an internal gear that meshes with each of these planetary gears, a means for holding the sun gear non-rotatable, and a means for allowing the internal gear to rotate only by manual operation, A flange extending from the outer periphery of the output shaft and a plate rotatably attached to the outer periphery of the sleeve are connected by a plurality of connecting shafts that pass through the planetary gears. There is provided a hoisting gear that winds the mainspring by rotating in the forward direction, and a plate pushing member that is driven by the reverse rotation of the hoisting gear to push the plate in the rotating direction. Means for canceling the spring rewinding prevention function when the power is not supplied, and when the power supply is interrupted, the winding spring rotates and the hoisting gear rotates in the reverse direction. By pushing the plate and rotating together with the output shaft, the valve can be opened or closed, and when the sun gear is held unrotatable, the planetary gear is revolved by manually rotating the internal gear. Thus, the valve can be opened and closed by rotating the output shaft.

  That is, as an input member for rotating the output shaft through the revolution of the planetary gear, in addition to the conventional internal gear and the sun gear, a plate connected to the output shaft by a connecting shaft that penetrates the planetary gear is used. The plate is used for emergency opening and closing when power is cut off, and the sun gear is used for opening and closing during normal use, so that a manual operation mechanism using the internal gear as an input member can be constructed. This eliminates the need for a manual operation mechanism that is separate from the actuator, thus reducing the cost of the entire valve, and eliminating the need for actuator attachment / detachment before and after manual operation, thus enabling efficient maintenance work involving manual operation. It becomes like this.

  In the above configuration, as means for allowing the internal gear to be rotated only by manual operation, an outer peripheral tooth that meshes with a worm disposed outside the outer peripheral portion of the internal gear is formed, and the worm is rotated manually. The one with a handle attached can be used.

  As a specific configuration of the plate and the plate pushing member, the plate has a pin extending in the rotation axis direction, and the plate pushing member is engaged with the hoisting gear. A fan-shaped gear that is rotatably mounted around the shaft and that contacts and separates from the pin of the plate in the rotation direction may be used.

  Further, a spring winding motor that rotates the hoisting gear in the forward direction is provided as means for preventing rewinding of the mainspring spring during energization and releasing the spring unwinding preventing action when deenergized. After the completion of winding, if a current that generates a braking force that balances the elastic restoring force of the mainspring spring is used for the spring winding motor, the conventional clutch can be used as an inexpensive spring winding motor without a brake mechanism. Since it is replaced, the cost can be further reduced.

  In the present invention, as described above, the valve actuator can automatically open or close the valve when the power is cut off, and can manually operate the valve during maintenance or the like. Since the manual operation mechanism separate from the actuator is not required, the cost of the entire valve can be reduced. In addition, since it is possible to eliminate the operation of attaching and detaching the actuator before and after manual operation, it is possible to improve work efficiency such as maintenance accompanying manual operation.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 3 show the configuration of the main part of the embodiment except for the casing of the valve actuator. The actuator includes a drive gear 3 that rotates by driving a valve opening / closing motor 2 and an output shaft small-diameter portion 1a on an outer periphery of a small-diameter portion 1a of the output shaft 1 connected to a rotation shaft (not shown) of a valve body of the valve. A sun gear 5 connected to the drive gear 3 is rotatably attached by a sleeve 4 passing therethrough, a plurality of planetary gears 6 meshing with the sun gear 5 around the sun gear 5, and an internal gear meshing with each of these planetary gears 6. Lugia 7 is arranged.

  The output shaft 1 has a flange portion 1c protruding from the outer periphery of a large diameter portion 1b continuous to the small diameter portion 1a. Although not shown, a stopper plate is provided below the flange portion 1c of the large-diameter portion 1b. The stopper plate contacts the fixed stopper member at the fully closed position and the fully open position of the valve, and the output shaft 1 The rotation is prevented, so that the rotation range of the output shaft 1 is restricted to 90 degrees.

  The valve opening / closing motor 2 rotates the drive gear 3 integrally with the sleeve 4 and the sun gear 5 through a motor gear 8 attached to the main shaft and a reduction gear 9 meshed therewith. There is no built-in brake mechanism. Further, an operation switching lever 10 having teeth 10a meshing with the motor gear 8 is provided in the vicinity of the motor gear 8, and when the lever 10 is operated to the manual side (moved to the right side in the drawing), the teeth 10a become the motor gear 8. So that the drive gear 3, the sleeve 4 and the sun gear 5 are held unrotatable, and the protrusion 10b of the lever 10 pushes the operation switch 11, so that the energization of the valve opening / closing motor 2 is cut off. It has become.

  The internal gear 7 has an outer peripheral tooth 7 a that meshes with the worm 12 disposed on the outer peripheral portion thereof, and can be rotated only by operating the manual handle 13 attached to the worm 12 to rotate the worm 12. Yes.

  On the outer periphery of the sleeve 4, a plate 14 having a pin 14a extending in the rotation axis direction from a surface facing the drive gear 3, and a fan-shaped gear (plate pressing member) 15 contacting and separating the pin 14a of the plate 14 in the rotation direction. And are attached rotatably. The plate 14 is connected to the flange 1c of the output shaft large diameter portion 1b by a plurality of connecting shafts 16 penetrating each planetary gear 6. On the other hand, the sector gear 15 meshes with a hoisting gear 18 that winds the mainspring 17 by rotating in the forward direction, and when the hoisting gear 18 rotates in the reverse direction, the fan-shaped gear 15 rotates in the clockwise direction. The pin 14a of the plate 14 is pushed by a concave pin engaging portion 15a formed in the above.

  The mainspring 17 has an inner end attached to an attachment shaft 19 that rotates integrally with the hoisting gear 18, and an outer end attached to the fixed shaft 20. Then, the spring winding motor 21 provided in the vicinity of the fixed shaft 20 rotates the winding gear 18 forward via the motor gear 22 attached to the main shaft and the reduction gear 23 meshing with the motor gear 22, whereby the spring spring 17 is to be rolled up. This spring winding motor 21 is also of a type without a brake mechanism, like the valve opening / closing motor 2.

  Then, after the completion of winding of the mainspring 17 is detected by a sensor (not shown), a current for generating a braking force that balances the elastic restoring force of the mainspring 17 is continuously supplied to the spring winding motor 21 and the mainspring 17 is unwound. Is to be blocked. Therefore, this spring rewinding prevention action is canceled when the non-energized state in which no current flows through the spring hoisting motor 21 is achieved.

  When the operation switching lever 10 is operated to the manual side, the projection 10b of the lever 10 pushes the operation switching switch 11, so that the energization of the spring winding motor 21 is also cut off. At this time, the spring unwinding preventing action of the spring winding motor 21 is released.

  Next, the usage method and operation of this valve actuator will be described. When this actuator is used, first, the mainspring spring 17 is wound up by energizing in a state where the operation switching lever 10 is set to the automatic side (a state where the teeth 10a of the lever 10 are separated from the motor gear 8). As shown in FIG. 4A, the state of the actuator before the mainspring 17 is wound up is such that the sector gear 15 abuts the pin 14a of the plate 14 at the pin engaging portion 15a of one peripheral end surface, and the other peripheral end surface. It is meshed with the hoisting gear 18 in the vicinity, and the output shaft 1 is prevented from rotating clockwise in the valve fully closed position. After the actuator in this state is incorporated into the fully closed valve, when the spring winding motor 21 is driven to rotate the winding gear 18 clockwise (in the positive direction) as shown in FIG. As it is wound up, the sector gear 15 rotates counterclockwise. When the completion of the winding of the mainspring 17 is detected, the mainspring 17 is held in a pressure-accumulated state by the action of the spring-winding motor 21 preventing the mainspring 17 from rewinding. The movement of the parts up to is stopped. At this time, as shown in FIG. 4B, the sector gear 15 is rotated 90 degrees from the state of FIG. 4A and meshes with the hoisting gear 18 in the vicinity of one peripheral end surface.

  When the winding of the mainspring spring 17 is completed as described above, the valve can be opened and closed by driving the valve opening and closing motor 2. That is, when the valve opening / closing motor 2 is driven and the drive gear 3 and the sun gear 5 are rotated counterclockwise as shown in FIG. Since the lug gear 7 is held non-rotatable by the worm 12, each planetary gear 6 revolves counterclockwise while rotating clockwise and pushes the connecting shaft 16 penetrating the planetary gear 6. Thereby, the output shaft 1 and the plate 14 connected by the connecting shaft 16 rotate counterclockwise, and the valve is opened. As shown in FIG. 4C, when the output shaft 1 and the plate 14 are rotated 90 degrees and the valve is fully opened, the valve opening / closing motor 2 is automatically stopped. If the valve opening / closing motor 2 is driven in the reverse direction thereafter, the output shaft 1 can be rotated clockwise to close the valve. Even when the valve is fully closed, the valve opening / closing motor 2 automatically stops.

  Further, when the interruption of energization due to a power failure or an accident occurs during the use of this actuator, the spring unwinding preventing action of the spring winding motor 21 is released, so that the spring spring 17 is elastic as shown in FIG. Rewinding by the restoring force, the hoisting gear 18, the reduction gear 23 and the motor gear 22 rotate in the opposite direction to that during winding, and the sector gear 15 meshing with the hoisting gear 18 rotates clockwise to rotate the pin engaging portion. The pin 14a of the plate 14 is pushed by 15a. At this time, since the internal gear 7 is held unrotatable, each planetary gear 6 pushed by the connecting shaft 16 integrated with the plate 14 revolves clockwise while rotating counterclockwise. As a result, the sun gear 5 rotates integrally with the drive gear 3 to rotate the reduction gear 9 and the motor gear 8, and the plate 14 and the output shaft 1 rotate integrally clockwise. Then, the output shaft 1 is prevented from rotating clockwise in the fully closed position of the valve, the entire movement is stopped, and the state before the mainspring 17 is wound up (the state of FIG. 4A) is restored. In other words, this actuator automatically closes the valve when the power is cut off.

  On the other hand, when opening and closing the valve in a non-energized state for maintenance or the like, as shown in FIG. 8, first, the operation switching lever 10 is operated to the manual side so that the teeth 10 a mesh with the motor gear 8. The drive gear 3, the sleeve 4 and the sun gear 5 are held unrotatable, and the operation switch 11 is pushed by the projection 10b to cut off the energization of the valve opening / closing motor 2 and the spring winding motor 21. At this time, the spring unwinding preventing action of the spring winding motor 21 is released in the same manner as the interruption of energization due to a power failure or accident, and the sector gear 15 pushes the pin 14a of the plate 14, but the internal gear 7 and the sun gear 5 Since both of the planet gears 6 are held non-rotatable, the planetary gears 6 cannot rotate or revolve, and the output shaft 1 and the plate 14 do not move. Therefore, when the output shaft 1 is in the valve fully open position, the sector gear 15 cannot rotate, and the mainspring 17 does not rewind. When the output shaft 1 is between the valve fully open position and the fully closed position, the spring spring 17 is rewound until the sector gear 15 rotates and contacts the pin 14a of the plate 14.

  Then, after operating the operation switching lever 10 to the manual side as described above, the valve can be opened and closed by operating the manual handle 13 attached to the worm 12 to rotate the worm 12. That is, in this state, since the sun gear 5 is held unrotatable, when the internal gear 7 that meshes with the worm 12 is rotated by rotating the worm 12, each planetary gear 6 revolves while rotating and the connecting shaft 16. Is pushed, the output shaft 1 rotates integrally with the plate 14, and the valve is opened / closed together with the rewinding or winding operation of the mainspring spring 17.

  As described above, the valve actuator can automatically close the valve when the power is cut off, and can manually operate the valve during maintenance or the like. Therefore, a valve incorporating this actuator does not require a manual operation mechanism that is separate from the actuator, and is less expensive than the conventional one. In addition, since it is not necessary to attach and remove the actuator before and after manual operation, it is possible to improve work efficiency such as maintenance accompanying manual operation.

  In the above-described embodiment, when the hoisting gear rotates in the reverse direction, the sector gear as the plate pushing member pushes the pin of the plate. However, the plate pushing member rotates in the reverse direction of the hoisting gear. Any structure may be used as long as it has a function of driving the plate in the direction of rotation. On the other hand, the plate may be configured to rotate by being pushed by the plate pushing member at a portion different from the pin.

  Moreover, although the internal gear of the embodiment is rotated by the operation of the worm manual handle, the internal gear may be rotated only by the manual operation by other means.

  Furthermore, as a means for preventing the spring spring from rewinding when energized and releasing the spring unwinding action when not energized, in the embodiment, the current continues to flow to the spring hoisting motor even after the completion of spring winding. However, instead of performing current control of the spring hoisting motor, a clutch mechanism may be provided that allows only the hoisting gear to rotate in the positive direction when energized and frees the hoisting gear when de-energized. . When such a clutch mechanism is provided, the spring winding motor can be eliminated. This is because the mainspring can be wound up by a valve opening / closing motor or a worm operation in a manual state. However, since the clutch mechanism is generally more expensive than a motor without a brake mechanism, it is desirable to adopt the configuration of the embodiment in terms of cost.

  In the embodiment, the valve is automatically closed when the power is cut off. However, if it is safer to open the valve in the event of a power failure or accident, the valve is designed to open when the power is cut off. Can be changed.

The perspective view which shows the structure of the principal part of the actuator for valves of embodiment. 1 is an exploded perspective view of FIG. 1 is a longitudinal front view of FIG. FIGS. 4A to 4C are plan views of main parts for explaining the operation of the actuator of FIG. 1 is a longitudinal front view for explaining the spring winding operation of the actuator of FIG. 1 is a longitudinal front view for explaining the valve opening / closing operation of the actuator of FIG. 1 is a longitudinal front view for explaining the operation of the actuator of FIG. FIG. 1 is a longitudinal front view for explaining the operation during manual operation of the actuator of FIG. FIGS. 4A to 4C are schematic diagrams illustrating the configuration and operation of a conventional valve actuator, respectively.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Output shaft 1c collar part 2 Valve opening / closing motor 3 Drive gear 4 Sleeve 5 Sun gear 6 Planetary gear 7 Internal gear 7a Outer peripheral tooth 10 Operation switch lever 11 Operation switch 12 Worm 13 Manual handle 14 Plate 14a Pin 15 Fan-shaped gear 16 Connection Axis 17 Spring main spring 18 Hoisting gear 21 Spring hoisting motor

Claims (4)

  In a valve actuator that opens and closes a valve by rotating an output shaft connected to a rotating shaft of a valve body in both forward and reverse directions by driving a motor, the output shaft rotates around the output shaft by driving the motor. And a plurality of planetary gears meshing with the sun gear around each of the sun gears, and each of these planetary gears. A meshing internal gear, a means for holding the sun gear in a non-rotatable manner, and a means for allowing the internal gear to be rotated only by manual operation, and a flange that projects from the outer periphery of the output shaft and the sleeve A plate that is rotatably mounted on the outer periphery is connected by a plurality of connecting shafts that pass through the planetary gears, and a spiral spring is wound by rotating in the positive direction. A winding gear that performs curling, and a plate pushing member that is driven by the rotation of the hoisting gear in the reverse direction to push the plate in the rotation direction, and prevents the spring spring from unwinding when energized, When a means for canceling the spring rewinding prevention function is provided and the energization is interrupted, the mainspring spring rewinds and at the same time the hoisting gear rotates in the reverse direction, and the plate pushing member pushes the plate and integrates with the output shaft. When the sun gear is held unrotatable, the output shaft is rotated by manually rotating the internal gear and revolving the planetary gear. A valve actuator characterized in that the valve can be opened and closed.   The means for allowing the internal gear to rotate only by manual operation is formed by forming an outer peripheral tooth meshing with a worm arranged on the outer peripheral portion of the internal gear and attaching a manual handle for rotating the worm to the worm. The valve actuator according to claim 1, wherein the valve actuator is provided.   The plate has a pin extending in the rotation axis direction, and the plate pushing member is rotatably mounted around the output shaft so as to mesh with the hoisting gear, and in the rotation direction of the plate 3. The valve actuator according to claim 1, wherein the valve actuator is a fan-shaped gear that comes in contact with and separates from the pin.   Means for preventing the spring spring from rewinding when energized, and releasing the spring unwinding preventing action when not energized is provided with a spring hoisting motor that rotates the hoisting gear in the forward direction, and the winding of the mainspring is completed. 4. The valve actuator according to claim 1, wherein a current that generates a braking force that balances the elastic restoring force of the mainspring spring is continuously supplied to the spring winding motor. 5.

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