JPS6212945Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a device that uses an electric motor as a prime mover and opens and closes valves in various equipment via a reduction gear.

[Conventional technology]

Generally, equipment that uses fluids such as gases and liquids is equipped with valves that control the fluid flow rate and supply and stop the fluid. In particular, for remote control, an electric motor is used as the prime mover, an appropriate speed reducer is interposed, and these output shafts are directly connected to valves such as butterfly valves, camflex valves, dampers, etc. to open/close or adjust the opening of the valve. is often done.

[Problem that the invention attempts to solve]

However, most of the electric valve operating devices currently in practical use use a worm gear mechanism for deceleration, but it is inefficient and requires a large electric motor capacity, and the reduction gear is also required. There was a drawback to the larger size. In particular, in the case of small valves, there are drawbacks such as the operating device being abnormally larger than the valve, the installation space being restricted, and the need to install something more expensive than the valve.

In such a worm gear mechanism, a torque load is transmitted to the worm as a reaction force in the axial direction of the worm shaft. If the abnormal torque load that occurs when opening and closing, especially when fully closed, or when a foreign object is caught in the valve, exceeds a predetermined value, it will overcome the restraint device that prevents the worm shaft from moving in the axial direction and move the worm shaft in the axial direction. The power switch is turned off by mechanically driving the power switch, cutting off power to the electric motor.

Electric valve operating devices that use spur gears as reducers are efficient and can be made smaller, but conventionally they have been equipped with an appropriate device that detects the abnormal torque load mentioned above and cuts off the power to the electric motor. There was nothing. In addition, the worm gear mechanism has a self-holding function when the valve stops opening and closing, but the spur gear does not have this function. Therefore, in order to provide a self-holding function, the electric motor needs to be a brake motor. On the other hand, in the event of an emergency such as damage to various components or a power failure, the valve may be operated manually by switching from electric to manual mode, but in that case the brake motor and reduction gear must be disengaged.

This invention was developed in view of these conventional problems, and aims to solve the problems of abnormal torque load absorption and electric/manual switching all at once when spur gears are used in the reducer. do.

[Means for solving problems]

In order to achieve this purpose, the electric valve operating device of the present invention is a valve operating device in which an electric motor 3 having a brake 2 is connected to an output shaft 5 that opens and closes the valve via a reducer having a built-in gear group. The group is composed of spur gears, and the output shaft 5
A manual operation end is formed at the other end, and a plurality of concave portions b-2 are formed on the same circumference on the back surface of gear b, which is supported by a separate shaft 7 that meshes with the gear on the drive shaft 4 side of the electric motor 3. A convex surface 10 having slopes b-3 on both sides along the circumferential direction of the concave portion b-2 of the gear b, and having a slope 10-1 on the upper surface that fits into the concave portion b-2. -2 gear c is provided facing the output shaft 5 side, and both slopes b-3, 10-
A concentric shaft 7 in which a spring 8 is interposed between the concave portions b-2 and the gear b having the convex surface 10-2 is independent of the shaft 9 of the gear c having the convex surface 10-2. The concentric shaft 7
One end of the arm 13, whose intermediate portion is pivoted to the support frame 6, is locked to the upper end of the gear b on the side so as to be slidable in the axial direction so as to press the gear b toward the gear c side. End upward restoring spring 17
The manual sliding shaft 15 is engaged with the manual sliding shaft 15 having a
5 is characterized in that locking devices 21 and 29 for keeping the sliding shaft 15 in the lowered state and a switch 22 for stopping power supply to the electric motor 3 are provided on the upper part of the motor 5.

〔Example〕

Hereinafter, the present invention will be specifically explained based on embodiments shown in the drawings. FIG. 1 is a longitudinal sectional view of the apparatus of this embodiment, and FIG. 2 is a sectional view taken along the - line in FIG. 1. In these figures, 1 is an operation box,
This operation box 1 houses an electric motor 3 with a brake 2 for self-holding when stopped, and an output shaft 5 arranged parallel to the motor drive shaft 4, which are connected to the next deceleration spur gear group. are connected.
That is, as shown in FIG. 2, a is an electric pinion, which is meshed with a larger gear b supported by another shaft 7 via a support frame 6. The gear b is connected via a spring 8 to a later-described slope clutch 10 fitted to another concentric shaft 9, and the gear c formed outside the sleeve 11 of the slope clutch 10 is connected to the gear d of the other shaft 12. , the lower gear e integrally connected to the gear d is connected to the gear f loosely fitted on the shaft 9, and the lower gear g of the gear f is connected to the gear h fitted on the shaft 12 side. The lower gear i meshes with the gear j on the shaft 9 side, and the lower gear k of the gear j meshes with the output gear l fixed to the output shaft 5.

As shown in FIG. 3, the relationship between the gear b and the inclined clutch 10 is such that a concave portion b- with a constant width and depth is formed on the same circumference of the bottom surface of a spur gear having a tooth profile b-1 on the circumferential surface. 2 is formed, and predetermined inclined surfaces b-3 are provided at both ends in the circumferential direction of the recessed portion b-2. On the other hand, the opposing slope clutch 10 has a diameter smaller than that of the gear b, and has a convex surface 10-2 on its outer peripheral surface with an inclined surface 10-1 that fits into the concave portion b-2 on the gear b side. During normal operation, the inclined clutch 10 is pressed against the gear c side through the thrust bearing 14 by the arm 13, which will be described later, against the spring 8, so that the rotational force of the gear b is applied to the clutch 10 side. However, if excessive torque is applied to the driven side, that is, the output shaft 5 system, the inclined surface 10-1 on the clutch 10 side will slide on the inclined surface b-3 on the gear b side, and the The connection is becoming disconnected.

For this reason, an arm 13 whose intermediate part is pivotally connected to the upper end of the gear b is slidably locked in the direction of the axis 7.
As shown in detail in FIG. 4, this arm 13 is latched to a sliding shaft 15 that is supported at a different position parallel to the other side with its midway point as a fulcrum, and this sliding shaft 15 slides with the support frame 6. An upward force (in the direction of arrow 18) is constantly applied by a spring 17 interposed between the moving shaft 15 and the fixed ring 16.

On the other hand, this sliding shaft 15 is also an operating shaft for stopping the electric motor 3 in an emergency.For this reason, this sliding shaft 15 is supported by bearings 19 and 20 at the upper and lower ends, but in the axial direction. is designed to be able to slide. An operating lever 21 is fixed to the support frame 6 at an upper position of this sliding shaft 15.
1, the middle part contacts the power switch 22 of the electric motor 3, and the tip part engages with a stepped nut 29 fixed to the upper part of the sliding shaft 15, as shown in FIG. While rising, power switch 2
The circuit is set so that 2 turns on and turns off when it falls.

The sliding shaft 15 also has the function of a switching operation end to the manual side, and when the knob 23 provided at the upper end is pressed downward, the sliding shaft 15 moves to the lever 21 via the knob shaft 30 as shown in FIG. and a stepped nut 29 are engaged and held in a lowered state. As shown in FIG. 1, a lever end 24 into which a manual lever is fitted is formed at the upper end on the output shaft 5 side.

In FIG. 1, cam plates 25 and 26 provided above the output shaft 5 are connected to levers 27 and 26 that are brought into contact with the cam plates 25 and 26 by rotation of the output shaft 5.
The levers 27 and 28 are connected to an operating system for issuing signals for fully opening and closing the valve.

To recover, turn the knob 23 to rotate the knob shaft 30, and the pin 31 provided at the lower end of the knob shaft 30 presses the lever 21 to release the lock from the stepped nut 29, and the spring 17 automatically releases the lock. Eventually, the sliding shaft 15 rises and recovers.

In the configuration described above, the rotational force of the electric motor 3 is engaged with each other through the gears a to l, and the gear b and the inclined clutch 10. By biting, etc.
When abnormal torque is applied to the output shaft 5, the gear b and the slope clutch 10 resist the force of the spring 17, disengage from each other along the slopes b-3 and 10-1, and are forced through the arm 13. Push down the sliding shaft 15. Since there is a lever 21 on the sliding shaft 15 that turns off the power switch 22 on the motor side when the lever is lowered, the motor can be stopped immediately.
Once lowered, the lever 21 is moved as shown in FIG.
The tip of the stepped nut 29 is engaged with the stepped nut 29 to maintain the lowered state and prevent the slope clutch 10 from being damaged.

On the other hand, if it is necessary to perform manual operation for any reason, the sliding shaft 15 can be pushed down by pressing the knob 23 as described above, and as a result, the sliding shaft 15 can be moved down as described above. When the power switch 22 is turned off and the sliding shaft 15 is lowered, the tip of the arm 13 on the slope clutch side rises, and since the spring 8 is interposed between the gear b and the slope clutch 10, the connection between the two is terminated. can be cut off.
In this case as well, the lever 21 and the stepped nut 29 are in a locked state as shown in FIG. 5, so that the sliding shaft can be kept in the lowered state and the slope clutch 10 can be prevented from being damaged. Therefore, in this state, the lever end 24
If a manual lever is attached to the output shaft 5, the output shaft 5 can be freely operated manually.

[Effect of idea]

As explained above, the present invention is an electric valve operating device that uses a spur gear as a reducer.
A slope clutch that releases the relationship between the two when a torque load exceeding a certain value is generated is interposed in the reduction mechanism from the electric motor to the output shaft in an extremely compact manner.The slope clutch for absorbing abnormal torque load is uniquely designed. It has a structure that allows it to be used as part of the electric/manual switching mechanism. As a result, when an abnormal torque load occurs on the output shaft, the impact is automatically absorbed, and this functions as a torque switch. Furthermore, this operation can be used to immediately stop the rotation of the drive source, which is extremely effective in terms of device safety. Further, since such a shock absorbing means is used as a means for switching to manual operation, it is not only advantageous in terms of equipment, but also makes the apparatus compact. In this way, since the mechanically most efficient spur gear is used as a power transmission element, a smaller electric motor can be used.

Therefore, the conventional problems of abnormal torque load absorption and electric/manual switching when a spur gear is adopted as a reduction gear can be solved all at once.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of the electric valve operating device of the present invention, Fig. 2 is a cross-sectional view taken along the line - - in Fig. 1, Fig. 3 is a partially enlarged view, and Fig. b
3B is an enlarged view and a plan view of the slope clutch 10 of FIG. 1, FIG. 4 is a vertical sectional view showing the operating system of the arm 13 of FIG.
FIG. 5 is an explanatory view showing the locked state of the lever and stepped nut during manual operation, and FIG. 6 is an explanatory view showing the locked state of the lever and stepped nut during overtorque loading. 1: Operation box, 2: Brake, 3: Electric motor, 4:
Drive shaft, 5: Output shaft, 6: Support frame, 7: Axis, 8:
Spring, 9: Shaft, 10: Slope clutch, 1
1: Sleeve, 12: Shaft, 13: Arm, 14:
Thrust bearing, 15: Sliding shaft, 16: Fixed ring, 1
7: Spring, 18: Arrow, 19, 20: Bearing, 21: Operation lever, 22: Power switch,
23: Knob, 24: Lever end, 25, 26: Cam plate, 27, 28: Lever, 29: Stepped nut,
30: Knob shaft, 31: Pin, a to l: Gear.

Claims (1)

[Scope of utility model registration request] An output shaft 5 that opens and closes a valve by an electric motor 3 having a brake 2 via a reducer having a built-in gear group.
In the valve operation device in which the gear group is composed of spur gears, a manual operating end is formed at the other end of the output shaft 5, and the drive shaft 4 of the electric motor 3 is connected to the valve operating device.
A plurality of concave portions b-2 are formed on the same circumference on the back surface of gear b, which is supported by a separate shaft 7 that meshes with the gear on the side, and both sides of the concave portion b-2 of gear b along the circumferential direction are formed. A slope b-3 is provided on the upper surface, and the recessed portion b-3 is provided on the upper surface.
convex surface 10 having an inclined surface 10-1 that fits into 2;
-2 is provided facing the output shaft 5 side, and a spring 8 is interposed between both slopes b-3 and 10-1 to apply a biasing force to push them apart, so that the concave portion b-2 is A gear b having a convex surface 10-2 is fitted into the concentric shaft 7 which is independent of the shaft 9 of the gear c so as to be movable up and down, and the gear b on the side of the concentric shaft 7 is
An arm 13 whose middle part is pivotally connected to the support frame 6 at the upper end of the
One end of the arm 13 is slidably locked in the axial direction so as to press the gear b toward the gear c side.
A locking device 2 whose other end is locked to a manual sliding shaft 15 having an upward restoring spring 17, and which maintains the sliding shaft 15 in the lowered state at the upper part of the sliding shaft 15.
1, 29 and a switch 22 for stopping power supply to the electric motor 3.