Power-failure actuation control device for electric valve

Abstract

This invention discloses an electric valve power-off drive control device, installed on a ball valve, which can precisely control the opening or closing of the valve via a backup power supply when the main power supply is interrupted. The device includes upper and lower covers, a backup power supply, an operating switch, a direction indicator, a driver, a first sensor, a second sensor, a transformer circuit controller, and a microcontroller. The direction indicator and the two sets of sensors are coaxially arranged with the ball valve stem, synchronously displaying the valve status and providing precise angle control and full-open / full-close judgment, improving operational convenience and safety. The device also features automatic switching, manual operation, and power display functions, effectively responding to emergencies and ensuring safe system operation.

Claims

1. An electric valve power-off drive control device, installed on a ball valve connector, for driving a valve stem to control the opening or closing of the valve, characterized in that it comprises: a lower cover, disposed on the ball valve connector; an upper cover, disposed on top of the lower cover, having a first through hole on its top surface, and a backup power supply, an operating switch, and a direction indicator on its side wall; a driver, comprising a motor, a gear set, a first fixing plate, and a second fixing plate, the first fixing plate being disposed inside the lower cover, the second fixing plate being disposed above the first fixing plate, both fixing plates having holes for the valve stem to pass through, the gear set being located between the two fixing plates, the motor being mounted on the second fixing plate, the motor shaft being connected to the starting wheel of the gear set, and the center of the ending wheel being connected to the valve stem, providing drive for the valve stem to control the opening or closing of the valve; a first sensor, comprising two microswitches disposed at a 90-degree angle to the valve stem on the second fixing plate and a cam mounted on the valve stem, the cam rotating with the valve stem triggering the microswitches to generate a dry contact signal and outputting it to the microswitches. The system includes: a controller (MCU) providing full-open or full-closed valve control; a transformer circuit controller, located above the second fixed plate, with its input connected to AC power and its output connected to the MCU, converting AC power into low-voltage DC power for the MCU; a second sensor, located on the MCU, with a rotating shaft, a direction indicator attached to the upper end of the shaft, and a ball valve stem attached to the lower end, capable of accurately detecting and controlling the valve angle; and a MCU, located above the transformer circuit controller, connected to a backup power supply, operating switch, motor, transformer circuit controller, first sensor, and second sensor, providing backup power supply charging and energy storage, signal processing, and motion control to ensure coordinated operation of all components; and a valve status display, precise angle control, and full-open / full-closed position determination, achieved by coaxially aligning the direction indicator, second sensor, and first sensor with the ball valve stem.

2. The electric valve de-energizing control device as described in claim 1, wherein, The direction indicator is located in the first through hole. The direction indicator includes a top cover and an indicator cover marked "Open" and "Close". The bottom of the indicator cover has a slot that fits with the rotating shaft of the second sensor. It can be assembled on the upper end of the rotating shaft and rotate with it, allowing the user to visually judge the opening and closing status of the valve.

3. The electric valve de-energizing control device as described in claim 1, wherein, The backup power supply includes a cover, a battery, and a charge / discharge circuit controller. Both the charge / discharge circuit controller and the battery are connected to a microcontroller (MCU) to provide battery charging and energy storage as well as power output control.

4. The electric valve de-energizing control device as described in claim 1, wherein, The microcontroller (MCU) further includes a drive signal control module, a contact signal conversion module, and a pulse signal conversion module. The input of the drive signal control module is connected to the MCU, and the output is connected to the motor to drive the motor. The input of the contact signal conversion module is connected to two microswitches, and the output is connected to the MCU. It is used to detect the fully open or fully closed position of the valve stem and provide valve positioning control. The input of the pulse signal conversion module is connected to a second sensor, and the output is connected to the MCU. It is used to read the pulse signal of the valve stem rotation angle and provide precise valve angle control.

5. The electric valve de-energizing control device as described in claim 1, wherein, The top cover further includes a display screen mounted on the side wall of the top cover and connected to a microcontroller (MCU) to display the power status of the backup power supply.

6. The electric valve de-energizing control device as described in claim 1, wherein, The second sensor is a rotary encoder.

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