Novel overspeed petective slide valve

Abstract

The novel overspeed protection slide valve includes casing, valve lining, valve core, spring and its setting mechanism. The valve core in stepped structure may be move in two, including one upper and one lower, positions inside the valve lining cavity. When it is in the lower position, the valve core, the inner valve lining wall and the casing form separate primary pulsed oil cavity chamber, oil exhaust chamber, repositioning oil chamber, inverse and forward oil feeding chamber and spring chamber communicated to the oil exhaust chamber via the valve core hole. When the valve core moves to the upper position, the repositioning oil chamber is communicated to the inverse and forward oil feeding chamber. The valve lining and the casing are provided with primary pulsed oil inlet, safety oil port, repositioning oil port, test oil port and no-pressure oil back port, and the safety oil port is closed while the valve core is in the lower position and is communicated to oil exhaust chamber while in the upper position.

Description

technical field [0001] The invention relates to a novel overspeed protection slide valve, which belongs to the field of hydraulic control systems. Background technique [0002] For high-speed rotating machines such as steam turbines, the inertia moment of the rotor is generally small relative to the driving torque. Once the unit is in operation and suddenly disconnects from the power grid to remove all electrical loads, the huge driving torque of the steam turbine acts on the rotor, causing the speed to rise rapidly. If the judgment and treatment are not made in a timely, fast and reliable manner, the speed will exceed the limit speed allowed by safety, resulting in a vicious accident of destroying the machine. Therefore, to ensure high-speed rotating machinery, an overspeed protection device is often provided. Currently commonly used for the mechanical structure and electrical structure. [0003] For the overspeed protection device with mechanical structure, its structure...

AI Technical Summary

Problems solved by technology

[0003] For the overspeed protection device with mechanical structure, its structure is relatively complicated, and it needs to be pre-adjusted when it is static, and calibrated when the equipment is running, which needs to be completed after 2-3 startups and adjustments

If overspeed does not occur for a long time, the parts are easy to rust and get stuck; and the overspeed protection device with electrical structure, although its structure is relatively simple, is easily affected by external interference and affects reliability, and due to the existence of sampling time, the dynamic response slower

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