1. Improve the accuracy of fan assembly

选用低噪声的传动装置，采用合适的叶轮形状和降低叶轮转速均可减少运转时噪声，特别是大容量燃气电采暖炉，安装时没有缓冲垫运行时产生的机械噪声及由于风机装配精度不高、机组运转时不平衡的产生的冲击噪声与磨擦噪声高强度地从进气口、排气口、管道、调节阀、机壳以及传动机械等各部位辐射出来，引发高频尖叫声。

Low noise transmission device, proper impeller shape and low impeller speed can reduce the noise during operation, especially for large capacity gas-fired electric heating furnace, the mechanical noise generated during operation without cushion during installation, and the impact noise and friction noise generated due to the low assembly accuracy of fan and unbalanced operation of the unit can be transmitted from the air inlet, exhaust port, pipeline, etc The control valve, casing, transmission machinery and other parts radiate out, causing high-frequency screams.

2、改变喷嘴形状减少噪声的产生

2. Changing nozzle shape to reduce noise

燃气从喷嘴高速射流出来，与四周静止的空气之间产生强烈的扰动与动量、质量交换而形成噪声。试验得知，合理设计喷射口距离，防止射流相互干扰使射流起始段的特性发生变化，可以有效减少燃烧噪声。设应采用多孔喷嘴，降低燃气的压力和喷嘴的出口流速，不仅可减少射流噪声，而且还可降低燃烧噪声。

When the gas comes out of the nozzle at high speed, there is a strong disturbance and momentum and mass exchange between the gas and the static air around, resulting in noise. The results show that the combustion noise can be effectively reduced by reasonably designing the distance between the nozzles and preventing the mutual interference of the jets. In order to reduce not only jet noise but also combustion noise, multi hole nozzle should be used to reduce gas pressure and nozzle outlet velocity.

3、喷嘴设计加工合理

3. Reasonable nozzle design and processing

喷嘴流出的燃气向相对静止的气体中扩散时，气流方向和流束截面突然变化，会引起很大的噪声。喷嘴有毛刺或孔口粗糙不圆时，气流经喷嘴收缩便产生偏位噪声。燃气压力越高，偏位噪声越大。所以，设喷嘴的径长比一般取1∽2、喷嘴收缩角取60度方为合适，加工时保证加工精度及光洁度，将可大大减少产生噪声。

When the gas from the nozzle diffuses into the relatively static gas, the sudden change of the flow direction and beam cross section will cause a lot of noise. When the nozzle has burr or the orifice is rough and not round, the air flow shrinks through the nozzle and produces deviation noise. The higher the gas pressure is, the greater the deviation noise is. Therefore, when designing the nozzle, the ratio of diameter to length is generally taken as 1 ∽ 2, and the nozzle contraction angle is taken as 60 degrees. When machining, the machining accuracy and smoothness can be ensured, and the noise can be greatly reduced.

4、合理设计配气管

4. Rational design of air distribution pipe

从燃气比例控制阀出口到喷嘴前的气路应园角过渡，保证气流通畅，不会引起燃气比例控制阀内的平衡组件振动，引发气流扰动从而产生噪声。另外，燃气比例控制阀上盖的阻尼孔是用来调节空气量，除了保证阀门起到降压和稳压作用外，还起到降低和控制噪声传播的作用，因此在使用过程中不能受堵塞。

The gas path from the outlet of the gas proportional control valve to the front of the nozzle should have a circular angle transition to ensure the smooth flow of the gas, and will not cause the vibration of the balance components in the gas proportional control valve, which will cause the disturbance of the gas flow and produce noise. In addition, the damping hole on the upper cover of the gas proportional control valve is used to adjust the air volume, which can not only ensure the valve to reduce pressure and stabilize pressure, but also reduce and control the noise transmission, so it can not be blocked in the process of use.

5、引射器设计装配合理

5. Reasonable design and assembly of ejector

引射器工作时，如果混合管粗糙或有毛刺，气流通过时将产生噪声。另外，装配喷嘴时，其出口截面到引射器的喉部应有一定的距离且喷嘴线与混合管线应一致，否则将导致偏移或交角过大，这样不利于一次空气的吸入也会产生噪声。

When the ejector works, if the mixing tube is rough or has burr, the noise will be produced when the air flows through. In addition, when assembling the nozzle, there should be a certain distance between the outlet section and the throat of the ejector, and the center line of the nozzle and the mixing pipe should be consistent, otherwise it will lead to deviation or too large intersection angle, which is not conducive to the primary air suction and will also produce noise.

综合而言，电采暖炉产生噪音一般是由于前期系统设计不合理，造成电采暖炉出现噪音等问题，而一般高质量的电采暖炉都是经过多次的运转测试，各个零部件安装都是经过人员检测合格的，一般不存在硬件安装问题。

Generally speaking, the noise of electric heating furnace is generally caused by the unreasonable system design in the early stage, resulting in the noise and other problems of electric heating furnace. Generally speaking, the high-quality electric heating furnace has been tested for many times, and the installation of each part has been qualified by professional personnel, so there is generally no hardware installation problem.