厂家一下离心风机选用的要点风机不同于其他产品,使用时间一般在几年,甚至十几年,轴流离心风机而且价钱也高低不等,因此我们在选用离心风机时,一定要选择适合的而且性价比高的离心风机。首先根据所需风机的风量、风压这两个基本参数,通过风机的性能表(各家风机产品说明书都有相关数据)确定风机的型号和机号,以及所需功率,这时可能不止一款产品满足要求;我们再结合风机用途、工艺要求、使用工况(使用场合)等,选择风机的种类、机型以及结构材质等以符合所需的工作条件,力求使风机的额定流量和额定压力,尽量接近工艺要求的流量和压力,从而使风机运行时使用工况点接近风机特性的高效区。
The main point fan selected by the centrifugal fan is different from other products. The use time is generally in several years, even more than ten years, and the axial centrifugal fan is also high and low. Therefore, when we choose the centrifugal fan, we must choose the suitable and high cost centrifugal fan. First of all, according to the two basic parameters of the fan's air volume and wind pressure, the model and number of the fan and the required power are determined through the performance table of the fan, and the required power is determined. At this time, there may be more than one product to meet the requirements; we will combine the use of the fan, the process requirements, and the operating conditions. In order to make the rated flow and pressure of the fan as close as possible to the flow and pressure required by the process, the operating conditions of the fan are close to the high efficiency area of the fan's characteristic.
具体原则如下:The specific principles are as follows:
①在选择风机前,应了解国内离心风机的生产和产品质量情况,如生产的离心风机品种、规格和各种产品的特殊用途,了解目前国内风机行情。
Before selecting the fan, we should understand the production and product quality of the domestic centrifugal fan, such as the variety, specification and special use of various products, and understand the current domestic fan market.
②根据离心风机输送气体的物理、化学性质的不同,选择不同用途的离心风机。如输送有爆炸和易燃气体的应选防爆离心风机,确定风机所需防爆等级要求;排尘或输送煤粉的应选择排尘或煤粉离心风机;输送有腐蚀性气体的应选择防腐离心风机,确定防腐材质用玻璃钢还是PP等;在高温场合下工作或输送高温气体的应选择高温离心风机,并且了解环境温度以及输送气体温度等。
According to the different physical and chemical properties of centrifugal fans conveying gas, choose different types of centrifugal fans. For example, the selected explosion-proof centrifugal fan, which carries explosive and flammable gas, determines the requirement for the explosion protection grade of the fan; the dust or the pulverized coal should be selected for the dust or pulverized coal centrifugal fan; the corrosion resistant gas should be selected as the anticorrosion centrifugal fan, and the antiseptic material is PP, and so on. High temperature gas should be selected by high temperature centrifugal fan, and environmental temperature and gas temperature should be understood.
③在离心风机选择性能图表上查得有二种以上的离心风机可供选择时,应优先选择效率较高、机号较小、调节范围较大的一种,当然还可以性价比方面来比较,权衡利弊而决定。
When there are more than two centrifugal fans on the centrifugal fan selection performance chart, there are more than two centrifugal fans to choose. They should choose a higher efficiency, smaller number and a larger adjustment range, and of course, it can also compare the price ratio and weigh the advantages and disadvantages.
④如果选定的风机叶轮直径较原有风机的叶轮直径偏大很多时,为了利用原有电动机轴、轴承及支座等,必须对电动机启动时间、风机原有部件的强度及轴的临界转速等进行核算。
If the diameter of the selected fan impeller is much larger than the diameter of the original fan, in order to make use of the original motor shaft, bearing and support, the starting time of the motor, the strength of the original parts of the fan and the critical speed of the shaft must be calculated.
⑤选择离心式离心风机时,当其配用的电机功率小于或等于75KW时,可不装设仅为启动用的阀门。当排送高温烟气或空气而选择离心锅炉引风机时,应设启动用的阀门,以防冷态运转时造成过载。
When selecting the centrifugal centrifugal fan, when the motor power is less than or equal to 75KW, no valve can be installed for start-up. When the high temperature flue gas or air is discharged and the centrifugal boiler induced draft fan is selected, a starting valve should be set up to prevent overload during cold running.
⑥对有噪音要求的通风系统,应首先选择效率高、叶轮圆周速度低的离心风机,且使其在最高效率点工作;还应根据通风系统产生的噪声和振动的传播方式,采取相应的消声和减振措施。离心风机和电动机的减振措施,一般可采用减振基础,根据风机安装方式不同选用不同的减震设备等。
6. For the ventilation system with noise requirements, a centrifugal fan with high efficiency and low circumferential velocity of the impeller should be selected first, and it works at the highest efficiency point, and corresponding measures of noise reduction and vibration reduction should be taken according to the transmission mode of noise and vibration produced by the ventilation system. Vibration reduction measures for centrifugal fans and motors are generally available. Different damping devices are selected according to different installation modes of fans.
⑦在选择离心风机时,应尽量避免采用离心风机并联或串联工作。当不可避免时,轴流风机应选择同型号、同性能的离心风机联合工作。当采用串联时,第一级离心风机到第二级离心风机之间应有一定的管路联结。
When selecting a centrifugal fan, it is important to avoid using centrifugal fans in parallel or in series. When it is unavoidable, axial fans should choose the same type and homosexual centrifugal fans. When connected in series, the first stage centrifugal fan should have certain pipe connection between the second centrifugal fans.
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