1. Improve the accuracy of fan assembly

選用低噪聲的傳動裝置，采用合適的葉輪形狀和降低葉輪轉速均可減少運轉時噪聲，特別是大容量燃氣電采暖爐，安裝時沒有緩衝墊運行時產生的機械噪聲及由於風機裝配精度不高、機組運轉時不平衡的產生的衝擊噪聲與磨擦噪聲高強度地從進氣口、排氣口、管道、調節閥、機殼以及傳動機械等各部位輻射出來，引發高頻尖叫聲。

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、改變噴嘴形狀減少噪聲的產生

2. Changing nozzle shape to reduce noise

燃氣從噴嘴高速射流出來，與四周靜止的空氣之間產生強烈的擾動與動量、質量交換而形成噪聲。試驗得知，合理設計噴射口距離，防止射流相互幹擾使射流起始段的特性發生變化，可以有效減少燃燒噪聲。設應采用多孔噴嘴，降低燃氣的壓力和噴嘴的出口流速，不僅可減少射流噪聲，而且還可降低燃燒噪聲。

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、噴嘴設計加工合理

3. Reasonable nozzle design and processing

噴嘴流出的燃氣向相對靜止的氣體中擴散時，氣流方向和流束截麵突然變化，會引起很大的噪聲。噴嘴有毛刺或孔口粗糙不圓時，氣流經噴嘴收縮便產生偏位噪聲。燃氣壓力越高，偏位噪聲越大。所以，設噴嘴的徑長比一般取1∽2、噴嘴收縮角取60度方為合適，加工時保證加工精度及光潔度，將可大大減少產生噪聲。

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、合理設計配氣管

4. Rational design of air distribution pipe

從燃氣比例控製閥出口到噴嘴前的氣路應園角過渡，保證氣流通暢，不會引起燃氣比例控製閥內的平衡組件振動，引發氣流擾動從而產生噪聲。另外，燃氣比例控製閥上蓋的阻尼孔是用來調節空氣量，除了保證閥門起到降壓和穩壓作用外，還起到降低和控製噪聲傳播的作用，因此在使用過程中不能受堵塞。

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、引射器設計裝配合理

5. Reasonable design and assembly of ejector

引射器工作時，如果混合管粗糙或有毛刺，氣流通過時將產生噪聲。另外，裝配噴嘴時，其出口截麵到引射器的喉部應有一定的距離且噴嘴線與混合管線應一致，否則將導致偏移或交角過大，這樣不利於一次空氣的吸入也會產生噪聲。

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.

綜合而言，電采暖爐產生噪音一般是由於前期係統設計不合理，造成電采暖爐出現噪音等問題，而一般高質量的電采暖爐都是經過多次的運轉測試，各個零部件安裝都是經過人員檢測合格的，一般不存在硬件安裝問題。

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.