Unattended self-stimulated-type differential vacuum breaking valve

Abstract

The invention relates to an unattended self-stimulated-type differential vacuum breaking valve and belongs to the technical field of breaking of vacuums in hydrocone-type water outlet flow passes. Theunattended self-stimulated-type differential vacuum breaking valve is composed of a negative pressure sealed chamber, an air cylinder, a valve seat, a breaking valve base, a piston, a valve shaft pipe and normally-closed solenoid valves; an emergency air inlet window is arranged at the side edge of the valve seat, and a striking-type electromagnet is mounted on the front portion of a tempered glass window of the emergency air inlet window; a valve is fixedly mounted in the valve seat through the valve shaft pipe, and the valve shaft pipe communicates with the interior of a hydrocone flow passthrough the negative pressure sealed chamber; air outlet and inlet windows are evenly distributed on the circumferential wall of the valve seat, and the piston is arranged on the lower portion of thevalve shaft pipe inside the air cylinder; and the normally-closed solenoid valves are symmetrically arranged at the top of the air cylinder. According to the unattended self-stimulated-type differential vacuum breaking valve, during unit shutdown, through double control of the normally-closed solenoid valves and the striking-type electromagnet, it is ensured that a vacuum inside the hydrocone flow pass is broken during shutdown, the shutdown safety of a unit is ensured, attendance is not needed any longer, the labor cost is reduced, and meanwhile the safety of the unit is ensured.

Description

technical field [0001] The invention relates to an unattended self-excited differential vacuum breaking valve, which belongs to the technical field of vacuum breaking in a siphon type water outlet channel. Background technique [0002] When water pump units using siphon flow passages such as hydropower stations, pump stations, waterworks, and thermal power stations are shut down during operation, a vacuum breaker valve must be used to break the vacuum in the flow passages and divert the water flow from the outer river to achieve a timely and smooth shutdown of the main unit. If the vacuum breaker valve cannot be automatically opened in time when the vacuum breaker valve is shut down, the unit will overspeed and reverse, and even cause a runaway accident, and the consequences will be disastrous. Therefore, the working performance of the vacuum breaker valve, the stability and reliability of operation are very important to the efficiency and operation safety of water pump unit...

AI Technical Summary

Problems solved by technology

Chinese invention patent CN103133705B discloses a self-excited differential vacuum breaker valve. Although it uses two normally closed solenoid valves, if one of them fails, the breaker valve can operate in the same way without being affected, which is relatively safe; however, If the system leaks, although the control mechanism can detect that the destruction valve refuses to move and give an early warning, it cannot troubleshoot by itself. This requires manual intervention to troubleshoot. Vacuum in the water channel, so that the unit can be shut down safely, which not only increases the labor cost, but also has the risk that the unit cannot be shut down safely

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