DZW explosion-proof electric device-Global supplier

No. 16 Xiaoguanqiao Road, Weiyang Economic Development Zone, Hanjiang District, Yangzhou City, Jiangsu Province

One Brief Introduction to DZW Explosion proof Electric Device

TB/DZW explosion-proof electric actuator is an electrical installation for driving equipment, mainly used to realize the opening, closing and adjustment of valves. TB explosion-proof electric actuator is generally suitable for gate valves, globe valves, throttle valves, water gate valves, etc. TB/DZW explosion-proof electric actuator, abbreviated as Z-type electrical installation, has the characteristics of full functionality, reliable performance, advanced control system, small size, light weight, and easy use and maintenance. Valves can be remotely controlled, centrally controlled, and automatically controlled. Widely used in industries such as power, metallurgy, petroleum, chemical, papermaking, and wastewater treatment.

The performance of TB/DZW explosion-proof electric actuator meets the requirements of JB/T8528-1997 "Technical Conditions for Ordinary Valve Electric Devices". The performance of the explosion-proof type complies with the provisions of GB3836.1-2000 "Electrical Equipment for Explosive Gas Environments Part 1: General Requirements", GB3836.2-2000 "Electrical Equipment for Explosive Gas Environments Part 2: Explosion proof Type" d "", and JB/T8529-1997 "Technical Conditions for Explosion proof Valve Electric Devices".

II Classification of DZW type electric devices

Classified by protection type: there are outdoor type and explosion-proof type;

Divided by control mode: there are conventional type, integral type, and integral adjustment type;

The conventional DZW electric actuator has a separate structure and requires an external control box without on-site buttons.
The integral electric device is an integrated structure that can input switch signals and output 4-20mA signals, with on-site buttons.
The regulating electric device is an integrated structure that can input and output 4-20mA signals, adjust the valve opening size, and thus achieve the adjustment of flow rate.

According to the connection type, there are torque type, power station type, and thrust type.

III Working environment and main technical parameters of TB/DZW explosion-proof electric actuator
1. Power supply: Conventional, three-phase 380V (50Hz)
Special, three-phase 660V, 415V (50Hz, 60Hz);
Single phase 220V, 110V (50Hz, 60Hz)
2 Working environment:
1. Environmental temperature: -20~+60 ℃ (special orders -40~+80 ℃).
2. Relative humidity: ≤ 95% (at 25 ℃).
3. Protection type: Outdoor type used in places without flammable, explosive, and non corrosive media. There are two types of explosion-proof products, d Ⅰ and d Ⅱ BT4. d Ⅰ is suitable for non mining working faces in coal mines; DIIBT4 is used in factories and is suitable for explosive gas mixtures in environments of IIA and IIB levels T1 to T4. (See GB3836.1 for details)
4. Protection level: IP55 (special orders IP65, IP67).
3. Work schedule: Short 10 minutes (30 minutes for special orders).

4 Mechanism description of TB type electric actuator

1. Electric motor: The outdoor type uses YDF type, and the explosion-proof type uses YBDF type valve specific three-phase asynchronous motor.

2. Reduction mechanism: composed of a pair of spur gears and a worm gear pair for two-stage transmission. The power of the electric motor is transmitted to the output shaft through the reduction mechanism.

3. Torque control mechanism: When a certain torque is applied to the output shaft, the worm not only rotates but also generates axial displacement, driving the crank. The crank directly (or through a collision block) drives the bracket to produce angular displacement. When the torque on the output shaft increases to the set torque, the displacement generated by the bracket causes the micro switch to actuate, thereby cutting off the motor power and stopping the motor. This achieves the control of the output torque of the electric device and protects the electric valve.

4. Travel control mechanism:

Adopting the principle of decimal counter, also known as counter, it has high control accuracy. Its working principle is that a pair of large and small umbrella gears in the gearbox drive the intermediate transmission small gear, and then drive the stroke control mechanism to work. If the stroke controller has been adjusted according to the position of the valve opening and closing, when the controller rotates with the output shaft to the pre adjusted position (number of turns), the cam will rotate 90 °, forcing the micro switch to act, cutting off the power supply of the motor, and stopping the motor, thereby achieving control over the stroke (number of turns) of the electric device. Note 1: In order to control valves with a large number of turns, the cam can be adjusted to rotate 180 ° or 270 ° before pressing the micro switch.

5. Opening indicator mechanism: The input gear is driven by the gear of the counter, and after deceleration, the indicator disk rotates simultaneously with the opening and closing process of the valve to indicate the opening and closing amount of the valve. The potentiometer shaft and indicator disk rotate synchronously for remote transmission degree indication. Adjusting the gear by moving the number of rotations can change the number of rotations. The opening indicator mechanism is equipped with a micro switch and a cam. When the electric device is running, the rotating cam periodically activates the micro switch, with a frequency of one or two actions per rotation of the output shaft, which can be used for flashing signals, etc.

6-hand electric switching mechanism: It is a semi-automatic switching mechanism. When manually operated, the handle needs to be pulled to switch. When the manual state is switched to electric, it will automatically operate. It consists of a handle, a switching component, an upright rod, a clutch, a compression spring, etc. When a handwheel operation is required, push the handle in the manual direction, switch the component to raise the clutch, and compress the compression spring. When the handle is pushed to a certain position, the clutch disengages from the worm gear and meshes with the handwheel. At the same time, the upright rod stands upright on the end face of the worm gear under the action of the torsion spring, supporting the clutch from falling. After switching, the handle can be released and the handwheel can be used for operation. When electric operation is required, the motor will drive the worm wheel to rotate, and the upright rod supported on the end face of the worm wheel will fall down. Under the action of the compression spring, the clutch quickly moves towards the worm wheel and meshes with it, while disengaging from the handwheel, automatically achieving the transition from manual to electric state.

Attention: 1. Do not turn the switch handle when operating electrically!
When switching, push (or pull) the handle in the direction of the arrow. If the push is not in place, rotate the handwheel while pushing the handle!