JPH0750616Y2 - Valve actuator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a valve actuator capable of switching the opening / closing operation of a valve both electrically and manually.

[Prior Art] In recent years, valve actuators are generally designed so that they can be switched between electric operation and manual operation. For example, as shown in FIG. 6, a bevel gear 101 is integrally rotatably provided at a valve actuator output end 100 to which a valve shaft is to be connected, and a tip end of a hand lever 102 provided so as to be able to move forward and backward with respect to the bevel gear 101. Attach the bevel gear 103 to the
A manual input system that enables power transmission by meshing with the bevel gear 101 at the forward position of the hand lever 102, and a clutch mechanism 105 that connects the output end 100 and the motor drive shaft 104 in a connectable / disconnectable manner. An electric power input system is provided which enables transmission of power by operating the clutch mechanism 105 with the handle knob 106.

Then, at the time of manual input, first, the handle knob 106 is rotated to one side to disconnect the electric system, and while keeping this state, the hand lever 102 is pushed to connect the manual system, and further output is performed while rotating in this state. The valve body is opened and closed through the end 100.

Further, this one is automatically operated by a return spring 107 provided on the hand lever 102 and a similar return mechanism (not shown) provided on the handle knob 106 when both the operation ends 102 and 106 are not operated. The input system is turned off so that the electric input state is set.

On the other hand, in the structure shown in FIG. 7, a bevel gear 203 formed by meshing with a motor drive shaft (not shown) is rotatably mounted on a rotary shaft 202 connected to an output end 201, and a pin is attached to the bevel gear 203. 204 is projected in the axial direction, a sleeve 205 is externally fitted to the tip of the rotary shaft 202 so as to be rotatable integrally with the rotary shaft 202 and slidable in the axial direction, and the sleeve 205 is retracted so that the pin 204 Is engaged with an engaging groove 206 formed on the outer periphery of the sleeve 205 to form an electric input system that enables power transmission. Further, the manual input system is provided with a spur gear 207 integrally attached to the end face of the rotary shaft 202 and a parallel shaft center eccentric from the rotary shaft 202 so as to be movable back and forth, and is engraved on the inner periphery at the forward position And a handle knob 209 that enables transmission of power by engaging the internal gear 208 with the spur gear 207.

Further, in this device, by engaging the inner end portion 210 of the handle knob 209 with the outer circumference of the sleeve 205, the sleeve 205 reciprocates in conjunction with the forward / backward movement of the handle knob 209, and the clutch function described above is accompanied. I am able to let you do it.

That is, in the state where the handle knob 209 is pushed in as shown in the figure, the manual input system is disconnected and the electric input system is connected at the same time. Conversely, when the handle knob 209 is pulled out, the electric input system is disconnected. A manual input system is connected at the same time as it leans. The manual input operation is performed by rotating the handle knob 209 with the handle knob 209 pulled out.

[Problems to be Solved by the Invention] However, in the case of the one shown in FIG. 6, the hand lever 102 has to be constantly rotated while being manually pressed during manual input, which causes a problem of poor operability. is there. In particular, when the load connected to the output terminal 100 is large, the operating force is often increased, which makes continuous operation difficult. Moreover, focusing on the rotation of the hand lever 102,
When the pressing force decreases, the meshing state of the bevel gears 101 and 103 becomes shallower, and it is easy to cause inconveniences such as poor transmission and damage to the tooth tips.

Further, in the case as shown in FIG. 7, the inconvenience as described above with reference to FIG. 6 does not occur, but since the automatic return mechanism is not provided, the handle knob 209 is pulled out and manually operated. Later, the operator may forget to press the handle knob 209 again to return it to the electric input state as shown in the same figure, and the motor is driven in a no-load state so that a burning accident is likely to occur. In this case, simply handle knob
If a spring or the like for urging 209 toward the manual input side (that is, in the pulling direction) is provided, this also ends up in the sixth
Simultaneously with the pressing operation and the rotating operation as shown in the figure, and in either device, the manual and electric switching operation involves advancing and retracting the hand lever 102 or the handle knob 209 as a whole, which is necessary for the switching operation. The operating mechanism is inevitably large and complicated, and accordingly, a large operating force is required for the switching operation.

The present invention has been made by paying attention to the above problems. At the same time, the problems of each conventional valve actuator are solved at the same time, and the operability is improved to automatically return to the electric input state. The purpose of the invention is to realize a valve actuator that can be performed in a targeted manner.

[Means for Solving the Problem] The present invention adopts the following configuration in order to achieve such an object.

That is, the valve actuator according to the present invention includes a rotating shaft connected to an output end, a sleeve fitted to the rotating shaft so as to be integrally rotatable and axially slidable, and a sleeve for a manual input system in a forward position. A manual clutch mechanism connected to the input operation end, an electric clutch mechanism connecting the sleeve to the drive end of the electric input system in the retracted position, and a switching operation end connected to the sleeve for manually reciprocating the sleeve. An elastic urging member for urging the sleeve in the backward direction, and engages a circumferential rack formed on the outer periphery of the sleeve with a pinion pivotally mounted on the rotation center of the switching operation end. The rotation of the switching operation end causes the pinion to rotate to move the circumferential rack back and forth, whereby the sleeve reciprocates. It is set to.

[Operation] With such a configuration, when the switching operation end is operated to advance the sleeve, the sleeve disconnects from the electric clutch mechanism and the input operation end of the manual input system via the manual clutch mechanism. Is connected to the rotary shaft, power can be transmitted from the operating end to the rotary shaft. Next, when the switching operation end is resolved, the sleeve is automatically retracted by being biased by the elastic biasing member, so that the connection with the manual side clutch mechanism is disconnected and the sleeve is connected to the drive end through the electric side clutch mechanism. As a result, power can be transmitted from the drive end to the rotary shaft.

However, since the input operation end and the switching operation end are configured independently of each other, there is no inconvenience that the input operation and the switching operation must be performed simultaneously via the common operation end. .

Then, when the switching operation end is resolved, the sleeve automatically retracts and always returns to the electric input state, so that a situation in which the drive end is driven in the no-load state is surely avoided. In addition, the only member that moves forward and backward during manual and electric switching operations is the sleeve, and the entire operating mechanism required for switching operations can be made small and simple, so smooth switching operations and safety and durability can be achieved. It is possible to achieve compatibility with the improvement of the property.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

The valve actuator of this embodiment includes a shaft 2 (rotating shaft) connected to an output shaft 1 (output end), a sleeve 3 which is integrally rotatable with the shaft 2 and is slidable in an axial direction, and the sleeve 3. A manual clutch mechanism 5 connecting 3 to the handle knob 4 (input operation end of the manual input system) at the forward position, and an electric motor connecting the sleeve 3 to the motor drive shaft 6 (drive end of the electric input system) at the backward position. A side clutch mechanism 7 and a hand auto lever 8 (switching operation end) that is connected to the sleeve 3 and reciprocates the sleeve 3.
A return spring 9 (elastically urging member) for urging the sleeve 3 in the backward direction is provided.

More specifically, in this valve actuator, the output shaft 1 (output end) is arranged in the vicinity of the opening 12 provided below the valve actuator body 11, and the opening 12
A valve shaft (not shown) to be inserted further is connected to the output shaft 1. On the other hand, a shaft 2 is rotatably disposed in the valve actuator body 11, and the shaft 2 and the output shaft 1 are connected by a worm mechanism 13 formed between respective outer circumferences.

On the other hand, the sleeve 3 fitted onto the shaft 2 is provided with a key groove (not shown), and by inserting the key 21 projecting on the shaft 2 into the key groove, the sleeve 3 is attached to the shaft 2. Only the axial relative displacement of is allowed. A spur gear 51 that constitutes the manual clutch mechanism 5 is formed on the outer circumference of the front end portion where the diameter of the sleeve 3 is reduced. That is, the manual clutch mechanism 5 is provided on the inner circumference of the spur gear 51 and the handle knob 4, and is meshed with the spur gear 51 when the sleeve 3 moves forward to transmit the rotational force of the handle knob 4 to the sleeve 3. It is composed of the internal gear 52. In addition, handle knob 4
Are arranged on an axis parallel to and eccentric to the shaft 2.

Further, a pin groove 71 that constitutes the electric clutch mechanism 7 is formed in the rear end portion of the sleeve 3 along the longitudinal direction. That is, the electric clutch mechanism 7 has the pin groove 71.
A pin 72, which is located rearward of the pin groove 71, is rotatably mounted on the outer circumference of the sleeve 3 and is engageable with the pin groove 71 in the axial direction on its front end surface. It is composed of a Bevelga 73. In addition, this Bevelga 73
The driving force of the motor is transmitted to the motor drive shaft 6 via a bevel gear 61 attached to the motor drive shaft 6. Therefore, when the sleeve 3 is retracted and the pin 72 of the bevel gear 73 is engaged with the pin groove 71, the motor driving force can be transmitted to the sleeve 3 via the pin 72.

Further, in order to transmit the switching operation force of the hand auto lever 8 to the sleeve 3 as a forward / backward movement, a circumferential rack 31 is formed on the outer circumference of the sleeve 3, and the circumferential rack 31 is provided with a rotation center of the hand auto lever 8. The pinion 81 pivotally attached to the is meshed. The switching direction is such that when the hand auto lever 8 is pushed down, the sleeve 3 moves forward, and when the hand auto lever 8 is pulled up, the sleeve 3 moves backward.

Then, as shown in FIG. 3, an operating end 92 of a spirally wound return spring 9 whose one end 91 is embedded in the valve actuator body 11 is hooked on the shaft center of the hand auto lever 8, and the return spring 9 is engaged. Thus, the hand auto lever 8 is urged in the upward pulling direction.

Next, the operation of this embodiment configured as described above will be described. First, when the hand auto lever 8 is gripped and pushed downward to a predetermined position from the electric input state shown in FIG. 2, the sleeve 3 advances to the position shown in FIG. It is connected to the handle knob 4 via the manual clutch mechanism 5 while disconnecting from the handle 7, and power can be transmitted from the handle knob 4 to the shaft 2. Next, when the hand holding the hand auto lever 8 is released after the manual input is completed, the hand auto lever 8 is biased upward by the return spring 9, so that the sleeve 3 is automatically moved to the position shown in FIG. When the vehicle is retracted to the position shown in (3), the connection with the manual clutch mechanism 5 is cut off, and the motor drive shaft 6 is connected via the electric clutch mechanism 7 to enable power transmission from the motor to the shaft 2.

Thus, the valve actuator can drive the shaft 2 to rotate both electrically and manually, so that the valve shaft can perform the required operation via the output shaft 1.

With such a configuration, since the input operation is performed by the handle knob 4 and the switching operation is performed by the hand auto lever 8, the input operation and the switching operation are performed simultaneously through a common operation end. It does not cause any inconvenience. Moreover, when the hand auto lever 8 is released, the input state of the valve actuator is always automatically set in the electric system by the urging force of the return spring 9, so that the motor drive shaft 6 is driven in the no-load state without forgetting the return operation. Situations such as being done are definitely avoided. Therefore, this product has the problem of operability that the conventional automatic recovery type (see FIG. 6) has and the problem of motor burnout that the conventional non-automatic recovery type (see FIG. 7) has. , Can be solved at the same time. Further, since the sleeve 3 is the only member that moves forward and backward during the manual and electric switching operations, the entire operating mechanism required for the switching operation can be made small and simple in structure.
It is possible to achieve both smooth switching operation and improvement in safety and durability.

The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

[Advantages of the Invention] As described above, the present invention has a structure in which the input operation end and the switching operation end are independent of each other, and the sleeve that performs an antithetic switching operation is always biased toward the manual input side. ,
It is possible to provide a valve actuator that can easily perform switching / input operations and can reliably avoid a situation in which a drive end is driven in a no-load state and a burnout accident is caused. In addition, the only member that moves forward and backward during manual and electric switching operations is the sleeve, and the entire operating mechanism required for switching operations can be made small and simple, so smooth switching operations and safety and durability can be achieved. It is possible to achieve compatibility with the improvement of the property.

[Brief description of drawings]

1 to 5 show an embodiment of the present invention, FIG. 1 is a partially cutaway front view, and FIG. 2 is a partial front sectional view showing an enlarged main part. 3 is a sectional view taken along the line III-III in FIG. 2, FIG. 4 is an explanatory view seen from the direction of arrow A in FIG. 3, and FIG. 5 is an operation explanatory view corresponding to FIG. Further, FIGS. 6 and 7 are front views in which a part corresponding to FIG. 1 showing a conventional example is cut away. 1 ... Output end (output shaft) 2 ... Rotating shaft (shaft) 3 ... Sleeve 4 ... Input operation end (handle knob) 5 ... Manual clutch mechanism 6 ... Drive end (motor drive shaft) 7 ... Electric clutch mechanism 8 ... Switching operation end (hand auto lever) 9 ... Elastic biasing member (return spring) 31 ... Circular rack 81 ... Pinion

Claims (1)

[Scope of utility model registration request] 1. A rotary shaft connected to an output end, a sleeve fitted to the rotary shaft so as to be integrally rotatable and slidable in an axial direction, and the sleeve connected to an input operation end of a manual input system at a forward position. A manual side clutch mechanism, an electric side clutch mechanism for connecting the sleeve to a drive end of an electric input system in a retracted position, a switching operation end connected to the sleeve for manually reciprocating the sleeve, and the sleeve for retracting A circumferential rack formed on the outer circumference of the sleeve and a pinion axially mounted on the rotation center of the switching operation end, and the switching operation end. The valve actuator is configured so that the sleeve reciprocates when the pinion rotates to move the circumferential rack back and forth.