Mechanical emergency starting apparatus for start-delta voltage-reduction starting

Abstract

The invention relates to a mechanical emergency starting apparatus for start-delta voltage-reduction starting. The apparatus is composed of an insulation isolating frame, a rear metal sealing plate, two sets of electromagnetic control mechanisms, a manual operating mechanism and two sets of vacuum switch tube parts. Each electromagnetic control mechanism set includes a closing holding buckle plate, a driving connecting lever, a closing armature, a closing coil, and a closing spring; a long pull rod passes through a straight slot formed in the rear metal sealing plate and then connects a counterbore formed in the closing armature; and a thread part formed at the other end of the long pull rod is connected with a U-shaped linkage block arranged on a linkage rod of the manual operating mechanism movably by a positioning pin. According to the invention, two alternating-current vacuum contactors can be driven synchronously to realize mechanical emergency starting. The provided apparatus meets regulations in the mandatory article 11.0.12 in the national standard GB 50974-2014 ''Technical Specifications of Fire-fighting Water Supply and Fire Hydrant System'' implemented on October 1st, 2014.

Description

technical field [0001] The invention relates to a mechanical emergency starting device for star-delta step-down start, which is suitable for star-delta step-down start-up 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 contact i...

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

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