Mechanical emergency starting apparatus applied to star-delta voltage-reduction starting

Abstract

The invention relates to a mechanical emergency starting apparatus applied to star-delta voltage-reduction starting. The mechanical emergency starting apparatus comprises an insulating electric-insulating framework, a metal back sealing plate, two sets of electromagnetic control mechanisms, a manual operating mechanism and two sets of vacuum switching tube parts, wherein each set of 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 corresponding 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 through a positioning pin. The mechanical emergency starting apparatus can synchronously drive two alternating current vacuum contactors 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 used in star-delta step-down starting, which is suitable for star-delta step-down 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 main co...

AI Technical Summary

Problems solved by technology

However, the setting of the "L"-shaped pull hook is difficult to install, and it is easy to deform the card.

In particular, the consistency of the "L"-shaped pull hook is poor. For the current power-driven motor equipment, the conventional star-delta power frequency step-down start-up will cause trembling; the conventional star-delta power frequency step-down start-up is the most widely used and has the best stability. A way; since the star-delta start needs to lead out six power lines on the motor: U1, V1, W1, U2, V2, W2 use AC contactors to form a process from star start to delta operation, so in mechanical emergency start At this time, two AC vacuum contactors must be forced to operate, so that the six power lines can be directly energized to make the terminal motor run forcibly; a mechanical emergency starting device with good consistency is urgently needed

Images