Blower control system during power frequency/frequency conversion switching of high-voltage frequency converter

Abstract

The invention discloses a blower control system during power frequency/frequency conversion switching of a high-voltage frequency converter. The system comprises a control system which is connected to the high-voltage frequency converter and a damper regulator which is arranged between the control system and a blower damper, wherein the control system is used for receiving operation signals which are transmitted by the high-voltage frequency converter and retransmitting damper opening control signals which are transmitted by the high-voltage frequency converter to the damper regulator, and the damper regulator is used for controlling the opening of the blower damper by using damper opening control signals. During power frequency/frequency conversion switching of the high-voltage frequency converter, damper opening control signals which are transmitted by a Data Communication System (DSD) to the damper regulator is used for controlling the opening of the blower damper, the air supplying amount during output of the power frequency is the same with the air supplying amount during output of the frequency conversion, the air supplying amount is stable, and a boiler cannot explode or cannot be damaged caused by the fact that the boiler is power off or the negative pressure is high.

Description

technical field [0001] The invention relates to a fan control device, in particular to a fan control system when a high-voltage frequency converter is switched between industrial and frequency conversion. Background technique [0002] Fan is the customary abbreviation for gas compression and gas conveying machinery in my country. Usually, fans include ventilators, blowers, wind generators, etc. Gas compression and gas delivery machinery are machines that convert rotational mechanical energy into gas pressure energy and kinetic energy, and transport the gas out. The main structural components of the fan are impeller, casing, air inlet, bracket, motor, pulley, coupling, muffler, transmission parts, etc. [0003] In industrial production and product processing and manufacturing, fan equipment has a wide range of applications; its power consumption and throttling loss of related equipment such as valves and baffles, as well as maintenance and repair costs account for 7% to 25% ...

AI Technical Summary

Problems solved by technology

During the air supply process, if the high-voltage inverter fails, the high-voltage inverter will switch from the variable frequency output to the power frequency output by the bypass system, that is, the motor of the fan is directly powered by the grid, and the motor will quickly change from low frequency to high frequency. In the high-frequency state, since the air supply volume of the fan is proportional to the square of the motor speed, as the motor speed increases rapidly, the air supply volume increases rapidly, which may cause the boiler supplied by the fan to stall or the negative pressure is too large, resulting in boiler failure. explosion or damage

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