1, Technology
By the heavy hammer-type butterfly valve butterfly valve body, linkage hydraulic bypass valve, a heavy hammer, the release device, manual pump (or electric pump), fuel tank rack transmission and electronic control components. Pressure from the oil pump drive tanks enter the rack, the rack by the Pistons to promote butterfly板自spin axis of the gear to open the butterfly plate, and coaxial至下面cite the heavy hammer. Weights through the release of the pawl of the locking device lock spindles Spindle; lock spindle axis is fixed, care and support by the electromagnet to control the device. When the time of the accident, as part of electronic control movement, electro-magnet power, out of control Spindle lock in under the weight of the self-release spin axis, so that self-closing valves.
The butterfly valve of the hydraulic system to control the use of bis cutting butterfly valve closing speed, turn off the start of faster time to reduce the speed and rate of the sustained rise; the closure of the slow phase to control the rate of increase in water pressure.
2, technical characteristics and main technical parameters
2.1 Technical Features
Machine torch assembly with hydraulic dual-use system for the whole structure is compact, easy to operate.
In the absence of external power supply, the storage can take advantage of gravity to shutdown. When the unit has been growing too fast, the bearings overheating and loss of excitation when the generator can automatically shut down, which had automatic protection unit.
Closed with a speed of two properties.
The use of solenoid-controlled spindle lock body, a safe, reliable operation and a small force.
2.2 The main technical parameters, indicators
To D741-10-type heavy hammer-type butterfly valve as an example, the main technical data are: pressure, 1MPa; diameter, φ400, φ500, φ600, φ800, φ1000, φ1200; maximum use of head, 100m; the highest step-up head, 145m; Open time, about 5min manual, electric around 1min; closing time, fast paragraph 5 ~ 10s; slow clearance above 10 ~ 50s; the scope of protection has been growing too fast, 1.8 times the rated speed (adjustable).
3, the location and effect of specific applications
Linhai City, Zhejiang Province, Chai Tan Hydropower Station using automated equipment Zhejiang Pingyang two production D741X-10 heavy hammer-type butterfly valves. Patterns for the hybrid power station, a pressure tunnel 1100m, diameter 2.6m, the pressure of the tube length 50m, diameter 1.2m, design head 45.5m, the maximum head 47m, design flow of 1.8m3 / s, turbine HL220-WJ-50A, power generation Machine SFW-630-6/990 (excitation shunt reactor), rated voltage 400V, rated capacity of 630kW, rated speed 1000r/min. 2 January, 1991 into the largest power grid to power in March 1993, two machines running together 7780h. A good heavy hammer valve operation, the evaluation is as follows: (1) action right equipment to achieve the safe production, the two valves to open 203 times the closure of 203 times, 100% accuracy rate movements; (2) the average time to open the electric 55s, load rejection set fast time for the 5s, the first rapid increase in speed to reduce the rate of increase in the rate of 40% of control, the slow clearance time set to 20s, after the slow rate of increase is to reduce water pressure, an increase rate of 21 % of; (3) In the course of the accident unit down too fast, when more than 1.4 times the rated speed, the device made by the gun, heavy hammer automatically release the closure of inlet valves, to avoid accidents expanded security operation.
4, Conclusion
First of all, to improve the reliability of the equipment to ensure a safe shutdown. Secondly, reducing the labor intensity of workers to run to reduce the maintenance workload. Two units on duty to reduce the four, the annual savings of about 80,000 yuan.
In addition, the valve in the absence (less people) on duty or isolated grid power plant power plant when the plant lost power when the heavy hammer release can automatically shut down without having to back-up DC power to operate.
In a number of power plant design, if the unit is scheduled to GD2 and hydraulic structures under the conditions of deployment can not find a suitable guide vane closing time to ensure that the unit rate of appreciation and the appreciation pressure on the standards for no more than the allowable values at this time can be taken to speed weight bis-style butterfly valve closed, the first in order to reduce the speed quickly increased, the latter can reduce the water pressure slowly increased. This method is reliable than setting artificial resistance than economic surge tank setup.
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