Normally closed semiautomatic gas emergency cut-off magnetic valve

Abstract

The invention discloses a normally closed semiautomatic gas emergency cut-off magnetic valve comprising a magnetic coil assembly, a valve cover assembly, a valve body and an open valve handle assembly, wherein the magnetic coil assembly and the valve cover assembly are mutually blocked and can be disassembled; the valve cover assembly is in threaded connection and fixed with a gas inlet cavity of the valve body, the gas outlet cavity of the valve body is provided with the open valve handle assembly, the open valve handle assembly is fixedly connected with a check ring, the check ring is in threaded connection with a mandrel, a flat seal film is sleeved on a lower lug boss of the check ring, and a spring is sleeved on the excircle of the mandrel; a circuit board and a coil frame are arranged in the magnetic coil assembly, a charging capacitor is arranged on the circuit board, and a coil is coiled on the coil frame; a permanent magnet and a built-in iron core are arranged in the valve cover assembly; when the magnetic valve is energized, the capacitor is charged; when the magnetic valve is deenergized, the capacitor releases electric energy to lead the coil to work in order to generate an electromagnetic field which has opposite polarity with a permanent magnetic field, and the magnetic force of the permanent magnetic field is weakened to lead the spring to push the mandrel and the check ring to move in order to close the valve. The normally closed semiautomatic gas emergency cut-off magnetic valve is easier to replace the magnetic coil for being separating from the permanent magnet, has low power consumption, can be automatically closed and manually opened only when deenergized, can automatically recover when energized, and improves the safety.

Description

technical field [0001] The invention relates to an emergency shut-off solenoid valve for the linkage between urban gas pipelines and gas alarms, in particular to a low power consumption, safety extra low voltage (SELV) continuous power supply, automatic closing of the valve when power is off, and manual opening only The normally closed semi-automatic gas emergency cut-off solenoid valve. Background technique [0002] The semi-automatic normally closed solenoid valve known in the prior art, when the valve is manually opened, when the valve opening handle assembly in the valve is moved to the open position, the magnetic field generated by the electromagnetic coil is used to attract and lock the spring force, so that the valve remains In the open state; after the power is cut off, the magnetic field quickly disappears, and the spring force is released to make the valve close automatically. There is another way to manually open the valve, that is, forced opening. When the coil ...

AI Technical Summary

Problems solved by technology

[0003] 1. The power consumption of the electromagnetic coil is large: if the safety extra-low voltage (SELV), such as DC24V, is used for power supply, the power supply capacity of the existing gas alarm cannot meet the requirements of linkage matching, so the coil power supply is often powered by commercial power, which may lead to Reduced security of products and applications;

[0004] 2. The temperature rise of the coil is high, usually greater than 100°C: because the operating condition of the gas emergency shut-off valve is to be in the open state for a long time, this will make the electromagnetic coil stay in a high temperature state for a long time, which directly affects the life of the coil;

[0005] 3. If the forced opening method is adopted, the automatic closing function of the valve is still in failure state if the call is not restored manually in time, which is a fatal defect.

[0007] 1. No power-off automatic shut-off function: the shut-off function completely depends on external control, which is a fatal defect, because the power-off automatic shut-off function is a mandatory requirement for emergency shut-off valves in international standards and Chinese gas design codes;

[0008] 2. There are defects in the structure: if the lead-out position of the manual device is in the intake chamber of the valve body, the safety performance is low; the electromagnetic coil is not easy to replace; the shut-off port is easy to collect impurities in the pipeline, causing the valve to fail to close or not to close tightly; After the non-metallic parts outside the valve body are removed, leakage will occur, and the safety of the valve body is not enough

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