JPH039576Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric valve driving device with an automatic manual switching mechanism that allows a valve to be opened and closed automatically by a motor and also to be opened and closed manually.

(Prior art and its problems) An automatic valve opening/closing device equipped with an emergency shutoff mechanism requires a clutch to be interposed on a constantly rotating shaft in order to ensure switching of each operation. As shown in No. 55-31328, clutches had to be provided for the automatic operation system and the manual operation system, respectively.

Therefore, if the clutch fails, it becomes inoperable.

(Objective) The present invention is to provide a valve driving device that eliminates a friction clutch mechanism that is prone to failure, simplifies the overall configuration, and allows reliable switching operations.

(Structure of the invention) The structure of the invention is that a board attached to a valve housing and a base plate on which a motor is installed are arranged in parallel, and the rotational force of the motor is output between the board and the base plate. A reduction gear train for transmission to the gears is arranged via several shafts held perpendicular to each plate, and any one intermediate shaft of the reduction gear train constitutes a part of the reduction gear train. An intermediate floating gear and a manual operation handle shaft are fitted and connected so as to be slidable in the axial direction and rotatable around the axis, and on the outer periphery of the intermediate shaft between the intermediate floating gear and the handle shaft, An engagement protrusion for transmitting torque is provided protrudingly, and an engagement recess that is engaged with and disengaged from the engagement protrusion is cut in the axial direction on each opposing end surface of the intermediate idler gear and the handle shaft, and the intermediate idler gear The handle shaft is biased and held in an axially offset position where the engaging recess engages with the engaging protrusion, and the handle shaft is held in an axially offset position where the engaging recess is disengaged from the engaging protrusion. An automatic return spring that maintains the force is provided, and by pressing and displacing the intermediate floating gear against the spring through the handle shaft, the engagement recess of the handle shaft is engaged with the engagement protrusion, and the intermediate floating gear The engaging concave portion of the valve is disengaged from the engaging protrusion to enable manual valve opening/closing operations, and after manual operation, the spring automatically returns the valve by simply releasing the hand from the handle shaft. This is a simplified version.

(Example of the invention) An example of the invention of the invention will be explained with reference to the drawings.
2 is a base plate attached to the flange portion 44a of the valve housing 44, and 2 is a base plate disposed in parallel with the base plate 1 via a support 1a, on which a motor 3 capable of forward and reverse rotation is installed. 4 is a cover that surrounds the base plate 2 and the motor 3 and is fixed onto the board 1 with bolts 5. Reference numeral 6 denotes a reduction gear train disposed between the base plate 1 and the base plate 2 to transmit the rotational force of the motor 3 to the output gear 19, and is rotatably held perpendicular to each of the plates 1 and 2. They are mounted and arranged on four shafts 7, 8, 9, and 10. That is, in the reduction gear train 6, a spur gear 12 fixed to the rotating shaft 11 of the motor 3 meshes with a spur gear 13 fixed to the intermediate shaft 7 of the first stage. The helical gear 14 is meshed with the helical gear 15 fixed to the intermediate shaft 8 of the second stage, and the spur gear 16 fixed to the intermediate shaft 8 is meshed with the spur gear provided to the intermediate shaft 9 of the third stage. A spur gear 18 fixed to the intermediate shaft 9 is meshed with an output gear 19 which is a spur gear fixed to the output shaft 10. The intermediate shaft 9 has an intermediate floating gear 17 and a handle shaft 2 for manual operation.
The cylindrical portions 20a of 0 are fitted together so as to be slidable in the axial direction and rotatable around the axis, and the intermediate shaft 9 is
The handle shaft 20 is held by the base plate 2 via the cylindrical portion 20a of the handle shaft 20, which rotatably passes through the base plate 2. A torque transmission protrusion 21 is provided on the outer periphery of the intermediate shaft 9 between the intermediate floating gear 17 and the handle shaft 20 . On the end face of the boss portion 17a of the intermediate floating gear 17 and the end face of the cylindrical portion 20a of the handle shaft 20 facing the end face,
Engagement recesses 22 and 23 that are engaged with and disengaged from the engagement protrusion 21 are respectively cut in the axial direction. Note that the engagement recess 23 of the handle shaft 20 is connected to the engagement protrusion 2.
1, the intermediate shaft 9 is rotatable within the hollow hole 24 of the handle shaft cylindrical portion 20a, so that the handle shaft 20 does not rotate together with the intermediate shaft 9. Reference numeral 25 denotes an automatic return spring made of a coil spring that biases and holds the intermediate floating gear 17 in an axially displaced position where its engagement recess 22 engages with the engagement protrusion 21; It is inserted between 17 and 18 in a compressed state.
Reference numeral 26 denotes an automatic return spring made of a coil spring that urges and holds the handle shaft 20 in an axially displaced position where the engagement recess 23 separates from the engagement protrusion 21, and the handle protrudes from the base plate 2. It is interposed in a compressed state between a snap ring 27 fixed to the shaft 20 and a sliding plate 28 on the base plate 2. The deflection position of the handle shaft 20 is set by locking the large-diameter stepped surface 29 to the base plate 2, and a handle 30 is fixed to the end protruding from the cover 4.

31 and 32 are compressed coil springs that set the axial position of the intermediate shaft 8; 33 and 34 are limit switches 35 that are activated by overload when opening and closing the valve; A dog that is attached to the dog holding shaft 8a by a screw 36 so that its position can be set and moves in the axial direction together with the intermediate shaft 8,
When the helical gear 15 moves a predetermined amount in the axial direction with respect to the helical gear 14 during overload, the dog 35
operates the limit switch 33 or 34 to stop the motor 3. 37 and 38 are limit switches that set the opening and closing positions of the valve, and the valve is set at a predetermined opening position (for example, fully open position and fully closed position).
When the cam 39 rotates together with the output shaft 10,
40 respectively to stop the motor 3. Reference numeral 41 denotes an indicator that is attached to the indicator shaft 10a on the coaxial extension of the output shaft 10 and rotates around the axis together with the output shaft 10, and is visible through the valve opening indication viewing window 42 made of a transparent plate of the cover 4. This is to confirm the valve opening. Note that the other end 10b of the output shaft 10 is connected to the substrate 1.
The valve shaft 43 protrudes from the valve shaft 43 and is connected to the valve shaft 43.

In the above device, in the state shown in FIG. 1, the forward and reverse rotational forces of the motor 3 are
3, 14, 15, 16, 17, 18, and 19 to the output shaft 10, which rotates the valve shaft 43 in the forward and reverse directions to operate the limit switch 36, Opening/closing operation is performed at the opening degree set in 37. When it becomes necessary to open or close the valve manually, use the handle 3.
0 in the axial direction and displaces the intermediate floating gear 17 through the handle shaft 20 against the springs 25 and 26 to the position shown in FIG. 21, the engagement recess 22 of the intermediate idler gear 17 is disengaged from the engagement protrusion 21, and the intermediate idler gear 17 becomes rotatable with respect to the intermediate shaft 9. Shaft 20, engagement protrusion 2
1. Output shaft 1 via intermediate shaft 9 and gears 18 and 19
0 and the valve can be opened and closed manually. After manual operation, by simply releasing your hand from the handle 30, the intermediate floating gear 17 and the handle shaft 20 are moved to a position where the engagement recess 22 of the intermediate floating gear 17 engages with the engagement protrusion 21 due to the spring force of the springs 25 and 26. At the same time, the engagement recess 23 of the handle shaft 20 is deflected to a position where it is disengaged from the engagement protrusion 21, and the valve is automatically returned to the valve automatic opening/closing position by the motor shown in FIG.

In the above embodiment, the spring force of the coil springs 31, 32 is adjusted, or the limit switches 33, 3
The magnitude of the overload to be detected can be set by changing the position of 4 or the position of the dog 35 on the holding shaft 8a. Further, for example, when driving the valve from a fully closed state to the closing direction, the largest torque is required, but in this case, the engagement recess 2 of the intermediate idler gear 17
If the opening width in the circumferential direction of 2 is made a little wider than the engagement protrusion 21, a hammer blow effect will occur between the recess 22 and the protrusion 21, and the inertia of the motor will be reduced without requiring much torque from the motor 3. Torque can give maximum torque to the valve.

Note that the spring 26 of the above example may be omitted, and the intermediate floating gear 17 and the handle shaft 20 may be returned to the original position using only the spring 25.

Further, if it is sufficient to detect overload when the valve is fully open or fully closed, only one of the limit switches 33 and 34 may be installed. In addition, the engaging protrusion 21 may be formed of a round bar extending in the diametrical direction of the intermediate shaft 9 with both ends protruding from the outer periphery of the intermediate shaft as shown in the figure, or may be formed into a trapezoidal or elliptical shape as appropriate. It is acceptable to have protrusions of the same shape protruding from the outer periphery of the intermediate shaft, and the number of protrusions protruding from the outer periphery of the intermediate shaft may also be one or three or more. Several engagement protrusions are provided. Furthermore, the number of intermediate shafts is not limited to the above embodiment, and can be increased or decreased, and the intermediate shaft on which the intermediate idler gear 17 is provided is not limited to the above embodiment. Furthermore, the device of the present invention
The present invention is not limited to the above example, but can also be applied to, for example, a unidirectional rotation type valve drive device, in which case a motor that rotates in steps in one direction is used.

(Effects of the invention) Since the present invention has the above-mentioned configuration, simply by pressing and displacing the intermediate idler gear through the handle shaft against the automatic return spring, the engaging recess of the handle shaft can be moved into the engaging recess on the intermediate shaft. The engagement recess of the intermediate floating gear can be disengaged from the engagement protrusion while being engaged with the engagement protrusion, and the valve can be opened and closed manually by a simple push-and-turn operation. After manual operation, by simply releasing your hand from the handle shaft, the intermediate idle gear and handle shaft are automatically returned to the valve opening/closing position by the motor using the spring, without requiring any other special equipment or operation. Mistakes can be definitely prevented. Furthermore, the device of the present invention
The circuit board and the base plate on which the motor is installed are arranged in parallel, and the mounting shafts of the gears of the reduction gear train are arranged orthogonally to the base plate and the base plate between the base plate and the base plate. Therefore, the device can be made smaller, and each gear can be composed of spur gears, helical gears, etc.
The device becomes simpler. Moreover, by using the substrate and base plate that are parallel to each other as a reference, there is an advantage that adjustment, repair, and inspection of the device can be performed extremely easily.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a longitudinal sectional view, FIG. 2 is an exploded perspective view of the main parts, and FIG. 3 is a longitudinal sectional view showing the operating state of the main parts. 1... Board, 2... Base plate, 3... Motor, 6...
...Reduction gear train, 7, 8, 9, 10... Axis, 17...
...Intermediate floating gear, 20...Handle shaft, 21...
Engagement protrusion, 22, 23...Engagement recess, 25, 26
...Automatic return spring.

Claims (1)

[Scope of utility model registration request] A board attached to the valve housing and a base plate on which the motor is installed are arranged in parallel, and a reduction gear train for transmitting the rotational force of the motor to the output gear is installed between the base plate and the base plate. They are mounted and arranged on several shafts held perpendicular to the plate, and are attached to any one of the intermediate shafts of the reduction gear train with an intermediate idler gear forming a part of the reduction gear train and for manual operation. The handle shafts are fitted together so as to be slidable in the axial direction and rotatable around the shafts, and a torque transmission engagement protrusion is projected on the outer periphery of the intermediate shaft between the intermediate idler gear and the handle shaft. At the same time, engagement recesses that are engaged with and disengaged from the engagement protrusions are cut in the axial direction on each opposing end surface of the intermediate idler gear and the handle shaft, and an automatic return spring that biases and holds the handle shaft in an axially displaced position where it engages with the engagement protrusion, and biases and holds the handle shaft in an axially displaced position where its engagement recess separates from the engagement protrusion; An electric valve drive device with an automatic manual switching mechanism.