Control method and operation method for optimizing beaten sound of parallel propeller fan systems

A technology of axial flow fan and control method, which is applied in pump control, mechanical equipment, machine/engine, etc., and can solve problems affecting product sound quality, comfort, and consistent speed

Active Publication Date: 2012-07-18
GD MIDEA HEATING & VENTILATING EQUIP CO LTD
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AI Technical Summary

Problems solved by technology

Due to the limitations of motor processing technology, fluctuations in market voltage, and differences in air ducts, the speeds of the two fans in the parallel axial flow fan system cannot be completely consistent, but there are certain differences. The sound pressure of the blade rotation noise is relatively close, so it will produce obvious low-frequency beating sound, which seriously affects the sound quality and comfort of the product

Method used

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  • Control method and operation method for optimizing beaten sound of parallel propeller fan systems
  • Control method and operation method for optimizing beaten sound of parallel propeller fan systems
  • Control method and operation method for optimizing beaten sound of parallel propeller fan systems

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Embodiment Construction

[0038] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0039] see figure 1 , for a newly developed parallel axial fan system, especially a large-diameter, high-speed parallel axial fan system, it is first necessary to test the time-domain noise characteristics of the parallel axial fan system, through time-domain spectrum or simple subjective Evaluate the system for low frequency flapping noises. If you can hear obvious low-frequency periodic noise, or its time-domain spectral characteristics are similar to figure 2 , it shows that there is beating vibration in the parallel axial flow fan system, and it is necessary to adjust the PWM of each motor. The beating vibration period caused by the rotational noise of any two fan blades in 1 / (f 2 -f 1 ) is close to the minimum time resolution of the human ear, 0.05s.

[0040] After adjustment, perform the noise test. If you can still feel the beating vibratio...

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Abstract

The invention relates to a control method and an operation method for optimizing the beaten sound of parallel propeller fan systems. A parallel propeller fan system includes more than two parallel propellers. In the control method, when the reciprocal of a vane rotational frequency difference of any two propeller fans in parallel propeller fan systems at the identical time is smaller than or approaches to the minimal time resolution of 0.05s of human ears by adjusting the control parameter of the rotational speed of a direct-current motor PWM of each propeller fan in more than two parallel propeller fan systems, the human ears can not differentiate the existence of beaten vibration and can regard the beaten vibration as a steady-state signal, thereby the aim of optimizing the sound quality is realized. Compared with a method of adjusting the vane number of two fans and the vane shape of two fan vanes to realize the optimization of the sound quality, the invention not only is simple and reliable, but also can not increase any cost, and is very suitable for batch production or batch adjustment and modification. The invention has the characteristics that the beaten sound of the parallel propeller fan systems can be optimized or eliminated, the operation is convenient and the cost is not increased.

Description

technical field [0001] The invention relates to a control method and an operation method for optimizing the beating sound of a parallel axial flow fan system, which is especially suitable for the field of air conditioning equipment and ventilation equipment, and is used to optimize or eliminate parallel axial flow fans with relatively large diameters and high rotational speeds Inherent low frequency clattering sound. Background technique [0002] At present, in order to reduce the occupied space of air-conditioning equipment and ventilation equipment, improve the cost performance and energy efficiency of products, large-diameter, high-speed parallel axial flow fan systems are widely used in this industry. Due to the limitations of motor processing technology, fluctuations in market voltage, and differences in air ducts, the speeds of the two fans in the parallel axial flow fan system cannot be completely consistent, but there are certain differences. The sound pressure of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04D27/00F04D25/16
Inventor 吴彦东游斌刘军莫平辉郭军李仕云
Owner GD MIDEA HEATING & VENTILATING EQUIP CO LTD
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