JPH0783345A - Motor-driven control valve driving device - Google Patents

Abstract

PURPOSE:To improve emergency responsiveness by changing a control valve opening, by using a first electromagnetic clutch means and a first electric driving means in a normal opening control command, and by using a second electromagnetic clutch means and a second electric driving means driven by a battery in an emergency opening control command. CONSTITUTION:For inputting an ordinary opening control command S4, in response thereto, the first drive control means 31, 38 connect the first electromagnetic clutch CL to drive the first electric driving means M1. Thus, an opening of a control valve is changed. The opening is maintained by stopping the first electric driving means M1. Here, the second electromagnetic clutch SOL is not energized, and the second electric driving means M2 is inoperative. For inputting emergency opening control commands S1 to S3, by disconnecting the first electromagnetic clutch CL and connecting the second electromagnetic clutch SOL, the second electric driving means M2 is driven by a battery 37 to control the opening of the regulator valve.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor-operated control valve drive device, and more particularly to a countermeasure for a power failure or an emergency.

[0002]

2. Description of the Related Art Generally, a motor-operated valve rotatably drives an output shaft by the force of an electric motor to open / close a valve device connected to the output shaft. This type of motor-operated valve is normally operated by an AC power source, and therefore, if power is not supplied from the AC power source due to a power outage, for example, the opening degree immediately before the power outage remains unchanged.

However, for example, in a plant facility that handles combustible gas or the like, when a power failure occurs, the operation of the entire facility is stopped, so a large amount of unburned gas remains in the pipe unless the valve is closed, and an explosion occurs. The danger of Therefore, in the motor-operated valve device used in this type of application,
Even in the case of a power failure, it is necessary to urgently close (or open) the valve.

The prior art of a motor-operated valve which has taken measures of this kind is disclosed in, for example, Japanese Patent Publication No. 63-673 and Japanese Patent Laid-Open No.
It is disclosed in JP-A-203686. Japanese Examined Sho 63-
In the motor-operated valve of Japanese Patent No. 673, an electromagnetic clutch is interposed between a gear shaft connected to an electric motor and a gear connected to a valve body drive shaft, and a return coil spring is connected to the valve body drive shaft. . When the valve is driven to open, the electromagnetic clutch is energized to connect the gear train in a rotational force transmitting relationship and the electric motor is energized. Energization of the electric motor is stopped when the valve is fully opened, but energization (ON) of the electromagnetic clutch is continued. Since the brake is not provided, the rotational force applied to the valve body (repulsive force of the return coil spring + rotational force applied to the valve body by the fluid) is applied to the rotary shaft of the electric motor through the gear train. When a power failure occurs, the electromagnetic clutch turns off and the electric mode
Since the gear train between the rotor and the valve drive shaft is disengaged, the valve drive shaft is driven to be fully closed by the return force of the return coil spring.

Further, in the motor-operated valve of Japanese Patent Laid-Open No. 4-203686, when the AC power is supplied, the electric motor is normally driven to drive the valve to the fully open state and the built-in battery is charged. When the AC power supply is cut off due to a power failure, the electric power stored in the built-in battery is supplied to the electric motor, and the relay contacts are switched to reverse the electric motor. It is driven and the valve is driven to the fully closed state.

[0006]

The conventional motor-operated valve as described above is a shutoff valve having only two kinds of stable states, fully open or fully closed, and is stopped at any intermediate opening and the opening is changed. It cannot be maintained. However, in various plant equipment, for example, in order to adjust the flow rate of the fluid,
A valve device capable of maintaining an arbitrary valve opening, that is, a control valve is required, and it is desirable that the valve opening can be adjusted by electrical control. Furthermore, it is desirable to be able to perform an emergency full closing operation or an emergency full opening operation in the event of a power failure. However, since such an electric control valve has not existed in the past, the method other than combining the shutoff valve and the control valve and connecting them in series is the only way to realize this type of function. There wasn't.

Further, since the conventional electric control valve is relatively slow in operation, even if the control valve is provided with an emergency full-close function, the conventional technique alone will delay the response at the time of emergency full-close. Inevitable.

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide an electrically controlled valve drive device which can maintain an arbitrary valve opening degree by electrical control and has an emergency full-close function or an emergency full-open function which has a quick response.

[0009]

In order to solve the above-mentioned problems, an electric control valve drive device according to the present invention comprises an output shaft (6) connected to the shaft of the control valve; Valve opening detecting means (7) for generating a signal corresponding to the opening of the worm wheel (5) integrated with the output shaft (5);
A worm shaft (4) meshing with the worm wheel; a first electric drive means (M1); a first electromagnetic clutch means (C).
L), and first connecting means (1, 2, 3) for connecting the worm shaft to the drive shaft of the first electric drive means;
Second electric drive means (M2); second connecting means (9, including a second electromagnetic clutch means (SOL) for connecting the worm shaft and the drive shaft of the second electric drive means; 1
0, 11); a battery (37) for storing at least electric power supplied to the second electric drive means; in response to a predetermined opening adjustment instruction (S4), the first electromagnetic clutch means is in a connected state. First drive control means (31, 38) for urging the first electric drive means to drive the shaft of the control valve, and a predetermined emergency opening adjustment instruction (S1, S2). , S3) and controls the first electromagnetic clutch means and the second electromagnetic clutch means to be in a disengaged state and a connected state, respectively, and to
Second drive control means (31, 35) for urging the electric drive means of to drive the shaft of the control valve.

Further, in a preferred aspect of the present invention, the second drive control means includes a power failure detection means (32) for detecting the presence or absence of a power failure of the main power source, and when the power failure is detected,
It is considered that there is an emergency opening degree adjustment instruction, and the first electromagnetic clutch means and the second electromagnetic clutch means are controlled to the disengaged state and the engaged state, respectively, and the second electric drive means is energized to perform the above-mentioned operation. Drives the axis of the control valve.

In a preferred aspect of the present invention, the first electric drive means and the second electric drive means have different characteristics from each other, and the first electric drive means can endure continuous operation. And the second electric drive means has a characteristic of generating a large output torque only for a short time.

The symbols shown in parentheses are reference numerals of corresponding elements in the embodiments described later, but each constituent element of the present invention is a concrete element in the embodiments. It is not limited to only.

[0013]

In the electrically operated control valve drive device of the present invention, when the normal opening adjustment instruction (S4) is input, in response to this, the first drive control means (31, 38) causes the first electromagnetic control means (31, 38) to operate. The clutch means (CL) is put in the connected state and the first electric drive means (M1) is driven. In this case, the driving force of the first electric drive means is the first electromagnetic clutch means, the first connecting means (1, 2, 3), the worm shaft (4) and the worm wheel.
Since it is transmitted to the output shaft (6) via the rule (5), the opening of the control valve changes. If the drive of the first electric drive means is stopped, the valve opening at that time is maintained. The valve opening can be identified by the signal output by the valve opening detection means (7).
In this case, since the second electromagnetic clutch means (SOL) is not energized, the worm shaft is disconnected from the drive shaft of the second electric drive means, and the second electric drive means is Since there is no load, the worm shaft can rotate smoothly.

On the other hand, when the emergency opening adjustment instruction (S3) is input due to a power failure of the main power source, the second drive control means (31, 35) causes the first electromagnetic clutch means and the second electromagnetic control means. The clutch means are set to the disengaged state and the engaged state, respectively, and the second electric drive means (M2) is driven. In this case, the electric power of the battery (37) is supplied to the second electric drive means, and the driving force of the second electric drive means is the second electromagnetic clutch means (SOL) and the second connecting means (9, 10 and 11), the worm shaft (4) and the worm wheel (5) to the output shaft (6), the opening of the control valve changes. In this case, since the first electromagnetic clutch means (CL) is not energized, the w
The shaft of the first electric drive means is disconnected from the drive shaft of the first electric drive means, and the first electric drive means does not become a load.
The shaft can rotate smoothly.

According to the present invention, the driving force generated by the first electric drive means is used for a normal opening adjustment instruction, and the second electric drive means is used for an emergency opening adjustment instruction. The driving force generated by is used. Therefore, by using the first electric drive means and the second electric drive means having characteristics suitable for their respective applications, it is possible to expect an operation suitable for each instruction. That is, in response to a normal opening adjustment instruction, a high drive speed is not required, but it is necessary to accurately position the valve element at an intermediate valve opening position. In some cases, an electric drive means that is relatively slow and capable of continuous operation is desirable. In addition, for an emergency opening adjustment instruction, a large driving torque is required to achieve high-speed operation, but the time required for driving force is very short and frequent operation is not possible, so temporary operation is not possible. It is desirable to have an electric drive means capable of obtaining a large output torque.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of the mechanical portion of an electric control valve drive device according to one embodiment is shown in FIGS. 1 is a vertical sectional view as seen from the front, and FIG. 2 is a sectional view taken along the line II-II in FIG. This will be described with reference to FIGS. 1 and 2. An output shaft 6 is rotatably supported via a bearing at the center of the device. An operation shaft of a control valve (not shown) is connected to a lower end 6a of the output shaft 6. That is, the valve opening degree of the control valve is adjusted by rotationally driving the output shaft 6. On the upper end side of the output shaft 6, an opening degree meter 8 for indicating the angle of the output shaft 6, that is, a valve opening degree is mounted, and a slider of a potentiometer 7 is further connected. A fan-shaped worm wheel 5 is attached to the center of the output shaft 6, and the worm wheel 5 is attached to the output shaft 6.
It is integrated with. A worm shaft 4 is rotatably installed at a position facing the worm wheel 5, and a worm 4c formed at the center of the worm shaft 4 is a worm wheel. It meshes with Le 5.

On the left side of the output shaft 6, an AC electric motor M1 which can be freely driven to rotate normally and reversely is installed. The drive shaft of this electric motor M1 has a sprocket wheel 1
Is rotatably supported via bearings, and the sprocket wheel 1 is an electric motor via an electromagnetic clutch CL.
Is connected to the drive shaft of the motor M1. Also, the worm shaft 4
The sprocket wheel 3 is attached to one end 4a of the. Chain 2 spans sprocket wheels 1 and 3. Therefore, when the electromagnetic clutch CL is engaged, the driving force of the electric motor M1 is sprocket wheel 1, chain 2, sprocket wheel 3, and wheel.
It is transmitted to the output shaft 6 through the worm shaft 4 and the worm wheel 5.

A gear 9 is mounted on the other end 4b of the worm shaft 4. Further, the intermediate gear 1 rotatably supported
0 meshes with the gear 9. A DC electric motor M2 is installed above the worm shaft 4, and a drive gear 11 mounted on the drive shaft of the electric motor M2 is arranged near the intermediate gear 10. The electric motor M2 of this embodiment is
It is a cell motor for automobiles and has the following ratings.

Torque: 1.82 kgf · m (measured value) Heat resistance: 90 ° C. Electric power: 0.8 KW Continuous operation time: 30 seconds Further, the electric motor M2 is equipped with a solenoid SOL integrated with it. By energizing the solenoid SOL, the drive shaft of the electric motor M2 can be moved in the axial direction. In this example, when the solenoid SOL is energized, the drive gear 11 mounted on the tip of the drive shaft moves to a position where it meshes with the intermediate gear 10, and when the solenoid SOL is de-energized, the drive gear 11 and the intermediate gear 10 are disconnected. The drive shaft moves to a position where the meshing is disengaged. The mechanism for moving the drive shaft was originally provided in a commercially available cell motor.

The solenoid SOL is energized to turn on the electric motor M2.
When the motor is driven, the driving force of the electric motor M2 is
1, intermediate gear 10, gear 9, worm shaft 4, and worm
It is transmitted to the output shaft 6 via the muwheel 5. As will be described later, when the electric motor M2 is driven, the electromagnetic clutch CL is disengaged, and at this time, the electric motor M1 is disconnected.
Does not become a load, and smooth driving is possible. In this example, the electromagnetic clutch CL is inserted between the drive shaft of the electric motor M1 and the sprocket wheel 1, but instead, it is provided between the worm shaft 4 and the sprocket wheel 3. Alternatively, the electromagnetic clutch CL may be inserted.

FIG. 3 shows the construction of the electrical equipment of the motor-operated control valve drive system of this embodiment. The AC power AC supplied from the AC power supply 34 is applied to the electric motor M1 and the electromagnetic clutch CL via the driver 38. The control circuit 31 and the driver 38 turn on / off the energization of the electric motor M1 according to the calculation result of the opening adjustment instruction signal S4 applied from the outside and the opening signal input from the potentiometer 7. The rotation direction (forward / reverse rotation) of the electric motor M1 is controlled. That is, when the calculation result indicates the opening direction, the energization of the electric motor M1 is turned on to set the driving direction of the electric motor M1 to the forward rotation, and when the closing direction is instructed, the electric motor M1 is energized. Is turned on to set the driving direction of the electric motor M1 to the reverse direction. At other times, the power supply to the electric motor M1 is turned off. When the cutoff signal S6 is ON, the electromagnetic clutch CL is forcibly deenergized and its connection is released. At other times, the electromagnetic clutch CL is turned on and connected.

On the other hand, the DC power supply 33 generates a stabilized DC voltage from the AC power AC supplied from the AC power supply 34. This DC voltage is applied to the control circuit 31, the driver 35, and the battery 37 via the charger 36. Therefore, when the AC power AC is supplied from the AC power supply 34, the battery 37 is always in the charging state.
Further, when the AC power supply 34 fails, DC power is supplied from the battery 37 to the control circuit 31 and the driver 35. DC power DC supplied from the charger 36 or the battery 37 is supplied to the electric motor M via the driver 35.
2 and the solenoid SOL. Driver 35
In accordance with a control signal from the control circuit 31, the electric motor M2 and the solenoid SOL are turned on / off, and the driving direction of the electric motor M2 is switched.

The control circuit 31 is composed of a microcomputer and has an emergency opening instruction signal S1 input from the outside.
The control signal (ON / OFF signal and drive direction signal) is output to the driver 35 in response to the emergency closing instruction signal S2 and the power cutoff detection signal S3. The energization of the electric motor M2 and the solenoid SOL is controlled by these control signals. The voltage detection circuit 32 monitors the AC voltage output by the AC power supply 34, and outputs a signal indicating whether or not a power failure occurs in the power supply as a power cutoff detection signal S3. Potentiometer
The opening signal output from the controller 7 is input to the control circuit 31 and is output to the outside.

The operation of the control circuit 31 is shown in FIG. The operation of the control circuit 31 will be described with reference to FIG. When the power is turned on, initialization is executed in step 41, and then the process proceeds to the next step 42.

In step 42, the power interruption detection signal S3
If it is active (power shutdown detection state), go to step 48, otherwise go to step 43.
Proceed to. In step 43, the emergency close instruction signal S2 is referred to, and if it is active (instruction present), step 48
Otherwise go to step 44. In step 44, the emergency open instruction signal S1 is referred to, and if it is active (instructed), the process proceeds to step 45, and if not, the process returns to step 42. That is, when a power failure is detected or an emergency closing instruction is detected, the process proceeds to step 48, and when an emergency opening instruction is detected, the process proceeds to step 45.
When the power failure is not detected and neither the emergency closing instruction nor the emergency opening instruction is detected, steps 42, 43 and 44 are repeatedly executed.

In step 45, the internal timer is first started, then the main drive system cutoff signal S6 is output to the driver 38, and the emergency open drive signal given to the driver 35 is turned on (the on / off signal is turned on). ON, set the drive direction signal to the open direction). As a result, the main drive system disconnection signal S6 forcibly interrupts the energization of the electromagnetic clutch CL, so that the electromagnetic clutch CL is disengaged. Further, since the solenoid SOL is energized, the drive shaft of the electric motor M2 moves in the axial direction, and the drive gear 11 fitted therein moves into the intermediate gear 10.
Mesh with. Further, since the electric motor M2 is energized and driven, the output shaft 6 rotates at a high speed in the direction of opening the control valve connected thereto.

In the next step 46, the opening signal output from the potentiometer 7 is referred to and it is discriminated whether or not it is fully opened. In step 47, step 45
It is discriminated whether or not the timer started in step 1 has timed out. When the opening signal is fully opened, the process proceeds from step 46 to step 4C. Also, even before detecting full opening,
When the time measured by the timer has passed a predetermined time (2 seconds in this example), the process proceeds from step 47 to step 4B to step 4
Go to C.

In this embodiment, when the emergency opening operation is carried out by the electric motor M2, the required operation time from the fully closed to the fully opened is about 1.5 seconds. Therefore, since it is abnormal that the time over is detected in step 47, an abnormal signal is output to the outside to inform that the abnormal has occurred in step 4B.

In step 4C, the emergency drive signal (ON / OFF signal) given to the driver 35 is set to OFF, and the main drive system cutoff signal S6 is released.

In step 48, first the internal timer is started, then the main drive system cutoff signal S6 is output to the driver 38, and the emergency closing drive signal given to the driver 35 is turned on (the on / off signal is turned on). ON, set the drive direction signal to the closing direction). As a result, the main drive system disconnection signal S6 forcibly interrupts the energization of the electromagnetic clutch CL, so that the electromagnetic clutch CL is disengaged. Further, since the solenoid SOL is energized, the drive shaft of the electric motor M2 moves in the axial direction, and the drive gear 11 fitted therein moves into the intermediate gear 10.
Mesh with. Further, since the electric motor M2 is energized and driven, the output shaft 6 rotates at a high speed in the direction of closing the control valve connected thereto.

At the next step 49, the opening signal output from the potentiometer 7 is referred to and it is discriminated whether or not it is fully closed. In step 4A, step 48
It is discriminated whether or not the timer started in step 1 has timed out. When the opening signal is fully closed, the process proceeds from step 49 to step 4C. Also, even before detecting full closure,
When the time measured by the timer has passed a predetermined time (2 seconds in this example), the process proceeds from step 4A to step 4B to step 4
Go to C.

In this embodiment, when the emergency closing operation is carried out by the electric motor M2, the required operation time from full opening to full closing is about 1.5 seconds. Therefore, since it is abnormal that the time over is detected in step 4A, an abnormal signal is output to the outside to inform that the abnormality has occurred in step 4B.

In this embodiment, by inputting the opening adjustment instruction signal S4, the opening of the control valve is reduced in the direction of increasing the opening of the control valve by the driving force of the electric motor M1. Can also drive the output shaft 6 in the direction,
Further, the valve opening can be maintained at any intermediate opening. The valve opening can be known from the opening signal. Furthermore,
In an emergency such as a power outage, the electric power stored in the battery 37 is used and the driving force of the electric motor M2 allows an emergency operation.

Further, in this embodiment, when the normal opening degree is adjusted by using the electric motor M1, the required operating time from the full opening to the full closing of the control valve and from the full closing to the full opening of the control valve is Although it is about 15 seconds, the time required for the emergency closing operation and the emergency opening operation using the electric motor M2 is about 1.5 seconds, which is very short. The time required for the emergency closing operation and the emergency opening operation can be shortened by using the electric motor M2 dedicated to the emergency operation,
Provided independently of the electric motor M1 for normal driving, these 2
This is because the two electric motors are selectively used. The electric motor M1 is capable of stable and continuous operation due to its structure, but cannot obtain a very large output. On the other hand, although the electric motor M2 cannot be continuously operated for a long time, it can drive the output shaft 6 at a high speed because it can obtain a large torque despite its small size.
Since the continuous drive time during the emergency operation is very short and there is no possibility of frequently performing the emergency operation, there is no problem with the restriction on the continuous operation time of the electric motor M2.

[0035]

As described above, the electric control valve drive device of the present invention can adjust the valve opening degree to any desired value by electrical control and maintain the valve opening degree. The emergency full opening function can be realized. Further, since the electric drive means is driven by using the electric power of the battery, it is possible to expect reliable operation of the emergency full-closed function or the emergency full-opened function even in an abnormal state such as a power failure.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a device according to an embodiment of the present invention as viewed from the front.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a block diagram showing a configuration of an electric component section of the apparatus of FIG.

FIG. 4 is a flowchart showing the operation of the control circuit 31 shown in FIG.

[Explanation of symbols]

1, 3: sprocket wheel 2: chain 4: worm shaft 5: worm wheel
Rule 6: Output shaft 7: Potentiometer
8: Position gauge 9: Gear 10: Intermediate gear 11: Drive gear 31: Control circuit 32: Voltage detection circuit 33: DC power supply 34: AC power supply 35, 38: Driver 36: Charger 37: Battery-M1, M2 : Electric motor CL: Electromagnetic clutch SOL: Solenoid

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Shun Matsumoto 20-1 Shintomi, Futtsu City Nippon Steel Co., Ltd. Technology Development Division (72) Inventor Nobuhiro Shin Fuji 12 Nakamachi, Muroran-shi, Hokkaido Nittetsu Hokkaido Control System Co., Ltd. (72) Inventor Hideo Saito 12 Nakamachi, Muroran City, Hokkaido Nittetsu Hokkaido Control System Co., Ltd. (72) Inventor Kazutaka Hosokawa 1-7-5 Higashimachi, Odawara-shi, Kanagawa Incorporated (72) Inventor Susumu Yamaguchi 1-7-5 Higashimachi, Odawara City, Kanagawa Koei Industry Co., Ltd.

Claims (3)

[Claims] 1. An output shaft connected to a shaft of a control valve; a valve opening detection means connected to the output shaft for generating a signal corresponding to the opening of the control valve; A worm wheel; a worm shaft that meshes with the worm wheel; a first electric drive means; a first electromagnetic clutch means, and the worm shaft and a drive shaft of the first electric drive means A second connection for connecting the worm shaft and the drive shaft of the second electric drive means, the first connection means for connecting the second electric drive means, the second electric drive means, and the second electromagnetic clutch means. Means for storing at least the electric power supplied to the second electric drive means; responsive to a predetermined opening degree adjustment instruction, urging the first electromagnetic clutch means to the connected state, and the first electromagnetic clutch means. Drive control means for activating the electric drive means of the control valve to drive the shaft of the control valve Stage; and in response to a predetermined emergency opening adjustment instruction, the first electromagnetic clutch means and the second electromagnetic clutch means are controlled to a disengaged state and a connected state, respectively, and the second electric drive means is controlled. An electric control valve drive device comprising: second drive control means for urging the control valve to drive the shaft of the control valve. 2. The second drive control means includes a power failure detection means for detecting the presence or absence of a power failure of the main power source, and when the power failure is detected, it is considered that there is an emergency opening adjustment instruction, and the first electromagnetic control is performed. The clutch means and the second electromagnetic clutch means are controlled to a disengaged state and a connected state, respectively, and the second electric drive means is energized to drive the shaft of the control valve. Electric control valve drive. 3. The first electric drive means and the second electric drive means have different characteristics from each other, and the first electric drive means has a characteristic of enduring continuous operation, The electric control valve drive device according to claim 1, wherein the electric drive means has a characteristic of generating a large output torque only for a short time.