Mechanical emergency starting apparatus of fire pump

Abstract

The invention relates to a mechanical emergency starting apparatus of a fire pump. The mechanical emergency starting apparatus comprises an insulating electric-insulating framework, a metal back sealing plate, an electromagnetic control mechanism, a manual operating mechanism and a vacuum switching tube part, wherein the electromagnetic control mechanism is provided with a switching-on holding pinch plate, a transmission connecting lever, a switching-on armature, a switching-on coil and a switching-off spring; a long pull rod passes through a through slot in the metal back sealing plate and is connected with a countersunk head hole in the switching-on armature; and a screw thread part at the other end of the long pull rod is movably connected with a U-shaped linking block on a linking rod of the manual operating mechanism. The mechanical emergency starting apparatus can drive an alternating current vacuum contactor to realize mechanical emergency starting; and regulation of No. 11.0.12 clause of national standard GB 50974-2014 ''fire water supply and hydrant system technical specification'' implemented on 1st, Oct. 2014 is satisfied.

Description

technical field [0001] The invention relates to a mechanical emergency starting device of a fire-fighting water pump, which is suitable for star-delta type depressurization starting equipment after recalculation and design of the structure of the mechanical part. Background technique [0002] The superior performance of the vacuum AC contactor has been widely used in various industries such as coal mines, metallurgy, electric power, textiles, etc. Its superior performance: no arc, full vacuum sealing, dustproof, explosion-proof, insulation coefficient, The stability factor has far exceeded that of ordinary AC contactors. The AC vacuum contactor is composed of an insulating frame, a metal base, a transmission arm, an electromagnetic system and a vacuum switch. When the electromagnetic coil passes the rated control voltage, the armature drives the arm to rotate, so that the main contact in the vacuum switch is connected. After the electromagnetic coil is de-energized, the mai...

AI Technical Summary

Problems solved by technology

When the control circuit fails to operate normally, it can realize the mechanical emergency start function; that is, at the last critical moment, the control circuit or the contactor itself fails to start when the pull-in coil fails, and the main power supply is intact at this time, through the mechanical emergency start device It can force the AC vacuum contactor to start the terminal motor directly. This is undoubtedly based on the traditional control circuit mode, which greatly improves the reliability of the system and solves the technical problem of the consistency of the mechanical emergency starting device.

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