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Control method for steplessly adjusting operation of high power water pump or fan

A technology of stepless adjustment and control method, applied in pump control, starter of single multi-phase induction motor, mechanical equipment, etc., can solve the problems of limited maximum capacity, large one-time investment, roughness, etc., and achieve precise control of production operation. parameters, saving equipment investment, and reducing the effect of impact

Active Publication Date: 2017-07-25
CHINA COAL SPECIAL DRILLING ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Existing motor equipment such as water pumps and fans adjust the flow mainly by adjusting the baffles or valves at the inlet and outlet, and then control the water flow and air flow. The control accuracy is not high, which also leads to the current design. The capacity is much higher than the actual needs, and there is a phenomenon of large horses and small carts, resulting in a lot of waste of electric energy; when mechanically adjusting the flow of fans and water pumps, the existing technology is manual adjustment of mechanical baffles or valves, and construction adjustments are frequent , Roughly, the pump is prone to cavitation; and frequent adjustment of mechanical valves is easy to accelerate the damage of vulnerable parts such as water pump impellers, bearings, pump shafts, and pipeline valves
Although the above problems can be well solved by using frequency converter control, the required frequency converter capacity is relatively large, and the one-time investment is large, especially the maximum capacity of the low-voltage frequency converter series produced by the manufacturer is limited, which cannot meet the requirements of high-power motors.

Method used

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  • Control method for steplessly adjusting operation of high power water pump or fan
  • Control method for steplessly adjusting operation of high power water pump or fan
  • Control method for steplessly adjusting operation of high power water pump or fan

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Embodiment Construction

[0022] Two water pumps were used as brine pumps in the refrigeration workshop of a wellbore freezing project (models 12SH-6A and 12SH-9A, and the rated power of the motors were 280 KW and 160 KW respectively). Because the frequency converter in the original control circuit matches the 160KW motor, and for the 280KW motor, the existing method of installation needs to buy a new control cabinet.

[0023] Through research and development, the inventor has provided a control method for steplessly adjusting the operation of high-power water pumps or fans. The controller PLC CPM1A is used to control the frequency converter ACS510 160KW, and the frequency converter is used to control the motor. According to the values ​​of the motor power and the power of the frequency converter, Manual or automatic switching control mode;

[0024] Since the power of the 280KW motor does not exceed twice the rated power of the inverter (320KW), modify the rated power of the inverter to the power of th...

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Abstract

The invention discloses a control method for steplessly adjusting operation of a high power water pump or a fan. A controller controls a frequency converter, and the frequency converter controls a motor; and controlled working modes are manually or automatically switched according to values of the power of the motor and the power of the frequency converter. According to the control method disclosed by the invention, the frequency converter with the capacity which is 1 / 2 of the capacity of the motor is adopted to control the motor of the pump or the fan to be started, so as to realize stepless control over the rated flow of about 0 to 80 percent, and the full-load operation requirement under a special condition is met. The low capacity frequency converter controls the high power motor, thus reducing the surplus of use of the frequency converter, saving energy and decreasing the equipment investment; impact on a power grid is reduced; meanwhile, the impact influence on a water pump impeller, a pump shaft and a bearing can be reduced to the maximum extent, the service lives of equipment and valves are prolonged, and the maintenance cost of equipment pipes is saved; by stepless adjustment of the water amount and the air volume, production operation parameters can be precisely controlled, and the engineering requirement can be met; and multiple interfaces can be connected with a computer and a network to realize intelligent control.

Description

technical field [0001] The invention relates to a control method for steplessly adjusting the operation of a water pump or fan, in particular to a control method for steplessly adjusting the operation of a high-power water pump or fan. Background technique [0002] Existing motor equipment such as water pumps and fans adjust the flow mainly by adjusting the baffles or valves at the inlet and outlet, and then control the water flow and air flow. The control accuracy is not high, which also leads to the current design. The capacity is much higher than the actual needs, and there is a phenomenon of large horses and small carts, resulting in a lot of waste of electric energy; when mechanically adjusting the flow of fans and water pumps, the existing technology is manual adjustment of mechanical baffles or valves, and construction adjustments are frequent , Roughly, the pump is prone to cavitation; and frequent adjustment of mechanical valves is easy to accelerate the damage of v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04B49/06F04D27/00H02P1/30
CPCF04B49/06F04D27/00H02P1/30
Inventor 纪春乡周伟王峰赵勇沈华军刘杰忠宋亚楠王强王保贵张亮
Owner CHINA COAL SPECIAL DRILLING ENG
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