Intelligent high-power mechatronic speed adjusting device

Abstract

The invention relates to an intelligent high-power mechatronic speed adjusting device which comprises a front-end planetary speed increaser, a speed-adjusting fluid coupling, a rear-end planetary speed changer and an intelligent control system. A speed adjustment mode of a telescopic outlet adjusting guide pipe is adopted by the fluid coupling, revolving speed input and power transmission capabilities of the fluid coupling are improved through transmission of a planetary gear of the front-end planetary speed increaser, and accordingly, the size of the coupling is reduced; three gears of the two-freedom-degree planetary speed changer arranged in the rear portion of the fluid coupling are acquired through two brakes and a clutch; the intelligent control system automatically determines the gears of the planetary speed changer and liquid charging quantity of the speed-adjusting fluid coupling according to given revolving speed or flow requirements of pumps and fans, so that operation efficiency of a working machine is improved, the fans and the pumps of power plants are enabled to work at high-efficiency areas, starting current can be remarkably reduced, working efficiency of the pumps and the fans is improved, electric energy is saved, and energy consumption is remarkably reduced.

Description

[0001] technical field [0002] The invention is applied to drive water pumps and fans in power plants, and relates to an intelligent speed regulating device, in particular to a high-power electromechanical integrated intelligent speed regulating device. Background technique [0003] Fans and water pumps are the most important power-consuming equipment in thermal power plants. They are generally in long-term continuous operation, and most of the time they are in low-load or variable-load operation, and their energy-saving potential is huge. According to statistics, the total annual electricity consumption of motors for thermal power plants in the country accounts for 5.8% of the national thermal power generation. The economic operation of auxiliary motors in power plants is directly related to the power consumption rate of the plant. Studies have shown that for fan and pump loads, if the current is changed by speed regulation, the power saving rate can reach 20% to 60%. ...

AI Technical Summary

Problems solved by technology

[0004] Most of the fans and water pumps in power plants in my country are generally driven by constant speed, and only a few fans and water pumps are equipped with speed control devices, but the speed control technology has always troubled the engineering community.

The speed regulation methods adopted in succession include electromagnetic slip clutch speed regulation, hydraulic coupling speed regulation, frequency conversion speed regulation, etc. Among them, the hydraulic coupling speed regulation is compared with the throttling adjustment methods of baffles and valves that are widely used at present. , has a significant energy-saving effect, but generally used hydraulic coupling speed regulation, there is energy loss during low-speed operation, resulting in reduced operating efficiency, affecting energy-saving effects, and the starting current is too large

Frequency conversion speed regulation technology is currently recognized as the most ideal and most promising speed regulation method at home and abroad, but because of its complicated operation, easy damage, and large investment, especially high-voltage frequency converters, users are often discouraged

At present, there are two main obstacles in the popularization and application of high-voltage and large-capacity transmission: one is that the power supply voltage of auxiliary motors in power plants in my country is 3~10kV high, and the withstand voltage level of power switching devices is not enough, which causes problems in voltage matching; the other is high voltage. High-power frequency conversion speed control devices have high technical content and great difficulty, so the investment is also high, while the energy-saving renovation of general fans and pumps requires low investment and high returns, resulting in problems in economic benefits

At the same time, because the waveform of the output current of the current-type inverter and the waveform of the output voltage of the voltage-type inverter are both non-sinusoidal waveforms, the higher harmonics will have various adverse effects on the motor and the power supply, such as increasing the additional loss of the motor, The temperature rise increases, so that the efficiency and power factor of the motor decrease, the output is limited, the noise increases, and the interference to radio communication increases, etc.

At the same time, high-order harmonics will cause the motor torque to pulsate. When the torque pulsation frequency is low and close to the natural frequency of the device system, resonance may occur

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