燃气热水器噪声特性及降噪研究

发布时间：2019-01-06 17:47

【摘要】：燃气热水器噪声严重影响居民舒适性。为了了解热水器噪声特性,找到热水器噪声问题并提出针对性降噪方案,本文在半消声室对某型号热水器进行噪声测试,得到原型机的噪声特性,提出顶部进风和增加消声导流罩的降噪方案。通过测试发现:原型机在最大负荷和正常负荷的半球面平均声功率为61.5 d B(A)和58.3 d B(A),且电磁噪声、风机噪声、燃烧系统噪声和空腔共振噪声在热水器腔体相互作用,形成多个峰值频率。进风方式由背面进风改为顶部进风降噪效果明显,其平均半球面声功率在最大负荷和正常负荷降幅分别为5.6 d B(A)和4.7 d B(A)。同时在中低频段声压级降幅明显,高频也有一定降低。增加消声导流罩虽然能降低高频噪声,但是流通面积小,阻力大,使总体降噪效果不明显。
[Abstract]:The noise of gas water heater seriously affects the comfort of residents. In order to understand the noise characteristics of the water heater, find out the noise problem of the water heater and put forward a targeted noise reduction scheme, the noise characteristics of the prototype are obtained by testing the noise of a certain type of water heater in the semi-anechoic chamber. The noise reduction scheme of the top air inlet and the increase of the silencing guide cover is put forward. It is found by test that the average spherical sound power of the prototype is 61.5 d B (A) and 58.3 d B (A), at the maximum load and normal load, with electromagnetic noise and fan noise. Combustion system noise and cavity resonance noise interact in the water heater cavity, forming multiple peak frequencies. The noise reduction effect of the inlet air from the back to the top is obvious. The average spherical acoustic power decreases by 5.6 d B (A) and 4.7 d B (A). At the maximum load and the normal load, respectively. At the same time in the low-and-medium-frequency band sound pressure level decline significantly, high-frequency also has a certain reduction. The noise reduction effect is not obvious because of the small circulation area and the large resistance, although the noise reduction can be reduced by increasing the noise guide cover.
【作者单位】：宁波方太厨具有限公司浙江省健康智慧厨房系统集成重点实验室;同济大学上海地面交通工具风洞中心;
【分类号】：TB535;TS914.252

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