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Frequency conversion speed regulation method and system for draught fans

A technology of frequency conversion speed regulation and fan speed, applied in mechanical equipment, non-variable capacity pumps, machines/engines, etc., can solve the problem of short life of fans, prolong the service life, reduce the magnitude of alternating force, and ensure safe fan operation. Effect

Active Publication Date: 2014-03-26
ZHONGYE-CHANGTIAN INT ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a fan frequency conversion speed regulation method and system to solve the problem of short life of the fan caused by direct frequency conversion speed regulation

Method used

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  • Frequency conversion speed regulation method and system for draught fans
  • Frequency conversion speed regulation method and system for draught fans
  • Frequency conversion speed regulation method and system for draught fans

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Experimental program
Comparison scheme
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Embodiment 1

[0045] Please refer to the attached figure 1 , figure 1 The flow chart of the fan frequency conversion speed regulation method provided by Embodiment 1 of the present invention is shown.

[0046] figure 1 The process shown includes:

[0047] S101. Obtain the current rotational speed of the fan.

[0048] The purpose of step S101 is to obtain the rotation speed of the fan under the current situation, and usually a rotation speed sensor is used to detect the current rotation speed of the fan. In the preferred solution, the current fan speed can be obtained according to the following steps:

[0049] a. Periodically detect the reference fan speed;

[0050] b. Take the average value of the reference fan speed detected multiple times as the current fan speed.

[0051] Since the operating condition of the fan is unstable and the actual speed fluctuates, the periodic detection method is adopted above, and the average value of the reference fan speed detected multiple times is use...

Embodiment 2

[0060] Please refer to the attached figure 2 , figure 2 It shows the flow of the fan frequency conversion speed regulation method provided by the second embodiment of the present invention.

[0061] figure 2 The process shown includes:

[0062] S203. Divide the speed range formed from the current fan speed to the target fan speed into multiple speed adjustment sub-ranges.

[0063] In this step, the range in which the fan speed needs to be changed is divided into multiple speed adjustment sub-ranges, and then the speed adjustment sub-ranges are used as the basis for gradual adjustment.

[0064] S204. Step by step adjust the current electromagnetic torque to the target electromagnetic torque according to the torque adjustment interval corresponding to each rotation speed adjustment sub-interval.

[0065] As described in the first embodiment, according to the electromagnetic torque corresponding to each end value of the speed adjustment sub-range, the torque adjustment int...

Embodiment 3

[0072] According to the motor frequency conversion speed regulation theory, in the process of fan frequency conversion speed regulation, when acceleration is required, the excitation current is first changed to increase the electromagnetic torque output by the fan (motor), and the fan will increase the electromagnetic torque between the electromagnetic torque and the load torque (that is, the resistance). Torque) under the combined action of acceleration, the output frequency of the power supply is adjusted synchronously with the increase of the rotational speed. Under the condition of constant output electromagnetic torque, the load torque increases, the combined torque of electromagnetic torque and load torque decreases, and the speed The increase rate decreases. When the speed increases to the target speed, the load torque and electromagnetic torque balance, and the fan will run stably at the target speed. Similarly, when deceleration is required, the excitation current outp...

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Abstract

The invention discloses a frequency conversion speed regulation method for draught fans. The method includes the following steps that (1) the rotating speed of the current draught fan and the rotating speed of a target draught fan are obtained; (2) current electromagnetic torque corresponding to the rotating speed of the current draught fan is gradually regulated to target electromagnetic torque corresponding to the rotating speed of the target draught fan, and frequency, corresponding to the rotating speed of the current draught fan, of the current draught fan is gradually regulated to frequency, corresponding to the rotating speed of the target draught fan, of the target draught fan according to frequency regulation amplitudes corresponding to electromagnetic torque regulation amplitudes in various steps. The invention further discloses a frequency conversion speed regulation system for the draught fans. According to the method and system, the alternating force magnitude can be reduced to relieve influences of negative factors such as partial sudden changes of wind pressure and sudden changes of electromagnetic torque output by motors of the draught fans, the draught fans can operate more safely, and the service life of the draught fans can be prolonged.

Description

technical field [0001] The invention relates to the technical field of fan control, and more specifically, to a method and system for frequency conversion speed regulation of a fan. Background technique [0002] The power consumption of the sintering main exhaust fan accounts for about half of the total energy consumption of the entire sintering plant, so the energy saving of the sintering main exhaust fan is of great significance to the energy saving of the entire sintering plant. In view of the need for energy saving, the sintering main exhaust fan works by frequency conversion. As the fan frequency conversion control technology becomes more and more mature, the traditional power frequency driving method of the fan is changed to the frequency conversion driving method to implement the air volume adjustment. The air volume adjustment through the frequency conversion driving method can reduce the loss of the fan and reduce energy consumption. [0003] The fan adopts variabl...

Claims

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Application Information

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IPC IPC(8): F04D27/00
Inventor 高鹏双邓逸
Owner ZHONGYE-CHANGTIAN INT ENG CO LTD
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