Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Denoising method for alternating-current fan of water heater

A technology of water heaters and fans, which is applied in the direction of machines/engines, mechanical equipment, liquid fuel engines, etc., can solve problems such as large electromagnetic noise, lack of quietness, and affecting people's normal life, and achieve filtering of high-order harmonic components, Effect of reducing electromagnetic noise

Active Publication Date: 2016-04-20
成都前锋电子有限责任公司
View PDF7 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, combined with the inherent characteristics of the hardware of the AC fan, it will generate large electromagnetic noise
[0006] Because the frequency of this electromagnetic noise is within the range that can be heard by the human ear, and water heaters are generally closely related to people's daily life, when used in a place close to people, people will not be quiet, thus affecting people's normal life. Life

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Denoising method for alternating-current fan of water heater
  • Denoising method for alternating-current fan of water heater
  • Denoising method for alternating-current fan of water heater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] figure 2 Shown is a schematic diagram of a water heater AC fan voltage waveform shown in a specific embodiment of the present invention,

[0023] The ratio of the on-time length and the off-time length of the driving voltage of the AC fan is controlled to be a predetermined ratio, and the predetermined ratio is M / N, where 4≤M / N≤8, and M and N are both positive integers.

[0024] Further, the length of the on-time or the length of the off-time is that every time M alternating current half-wave periods are turned on, N alternating current half-wave periods are turned off.

[0025] The noise reduction method of the AC fan of the water heater according to the present invention, by adjusting the time ratio of the AC fan driving voltage on and off to a specific ratio, the high-order harmonic components are well filtered out, thereby effectively reducing the electromagnetic noise .

Embodiment 2

[0027] In actual testing, although the technical solution disclosed in Example 1 can achieve the purpose of reducing electromagnetic noise, some defects have also been found. When the ratio of M / N is too small, the continuity and stability of the fan during operation will be poor. , there is obvious frustration, that is, the jitter is obvious, which has a great impact on the fan itself and the whole machine, such as reducing the life of the fan and affecting normal use; when the ratio of M / N is too large, the fan will be in The speed reduction effect during the operation is not obvious, and the wind speed and air volume can not reach the actual needs, which has a great impact on the performance of the fan, and when the value of M is too large, such as M>10, that is, the driving voltage of the fan needs to work continuously greater than 10 half-wave cycles, which will also affect the normal operation of the fan. In order to better illustrate the technical solution of the presen...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a denoising method for an alternating-current fan of a water heater. The denoising method comprises the step of controlling the ratio of the turn-on time duration to the turn-off time duration of a driving voltage of the alternating-current fan at a preset specific value which is M / N, wherein 4<=M / N<=8, and both M and N are positive integers. According to the denoising method for the alternating-current fan of the water heater, the ratio of the turn-on time duration to the turn-off time duration of the driving voltage of the alternating-current fan is regulated to the specific value, so that higher harmonic components are favorably filtered and removed, and furthermore electromagnetic noise is effectively reduced.

Description

technical field [0001] The invention relates to the field of water heaters, in particular to a noise reduction method for an AC fan of a water heater. Background technique [0002] In the forced discharge water heater, in order to effectively adjust the speed of the AC fan, the utility model patent "Fan speed regulation circuit for forced discharge water heater" (ZL200620033654.5) uses an AC power control circuit with a thyristor as the core. That is, a circuit that only changes the voltage, current or on-off of the control circuit without changing the frequency. [0003] However, in the prior art, when the AC fan is controlled to run at a relatively low speed through a specific AC fan speed regulating circuit, the AC fan will generate obvious electromagnetic noise. [0004] After analyzing the causes of the electromagnetic noise of AC fans, the following conclusions are drawn. The main noise generated in the air gap magnetic field comes from high-order harmonics, and the r...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): F04D27/00F04D29/66
CPCF04D27/00F04D29/663
Inventor 邱春松钟功建朱宁东曹志强
Owner 成都前锋电子有限责任公司
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com