专注通风管道加工·排烟罩

I. Design and calculation steps of ventilation duct system

1、绘制通风系统轴侧图，对个管段进行编号，标注各管段的长度和风量。以风量和风速不变的风管为一管段。一般从距风机远的一段开始。由远而近顺序编号。管段长度按两个管件中心线的长度计算，不扣除管件(如弯头、三通)本身的长度。

1. Draw the axle-side diagram of the ventilation system, number each section, and mark the length and air volume of each section. A duct with constant wind volume and speed is used as a section. Generally from the farthest section from the fan. Numbered in order of distance and proximity. The length of the pipe section is calculated by the length of the center line of the two fittings, without deducting the length of the fittings (such as elbows and tees).

2、选择合理的空气流速。风管内的风速对系统的经济性有较大影响。流速高、风管断面小，材料消耗少，建造费用小;但是，系统压力损失增大，动力消耗增加，有时还可能加速管道的磨损。流速低，压力损失小，动力消耗少;但是风管断面大，材料和建造费用增加。对除尘系统，流速多低会造成粉尘沉积，堵塞管道。因此必须进行的技术经济比较，确定适当的经济流速。根据经验，对于一般的通风系统，其风速可按表6-10确定。对于除尘系统，防止粉尘在管道内的沉积所需的低风速可按表6-11确定。对于除尘器后的风管，风速可适当减小。

2. Choose reasonable air velocity. The wind speed in the duct has a great influence on the economy of the system. High flow rate, small cross section of air duct, less material consumption and less construction cost; however, the pressure loss of the system increases, power consumption increases, and sometimes the wear of the pipeline may be accelerated. Low velocity, low pressure loss and low power consumption, but large cross-section of air duct, increased material and construction costs. For the dust removal system, how low the flow rate will cause dust deposition and plug the pipeline. Therefore, a comprehensive technical and economic comparison must be made to determine the appropriate economic flow rate. According to experience, for general ventilation systems, the wind speed can be determined according to Table 6-10. For dust removal systems, the minimum wind speed required to prevent dust deposition in the pipeline can be determined according to Table 6-11. For the duct after the dust collector, the wind speed can be reduced appropriately.

3、根据各管段的风量和选定的流速确定各段管径(或断面尺寸)，计算各管段的摩擦和局部压力损失。

3. Determine the diameter (or cross-section size) of each section according to the air volume and selected flow velocity of each section, and calculate the friction and local pressure loss of each section.

确定管径时，应尽可能采用表6-2表6-3中所列的通风管道统一规格，以利于工业化加工制作。

When determining pipe diameter, the uniform specification of ventilation pipes listed in Table 6-2 and Table 6-3 should be adopted as far as possible to facilitate industrial processing and production.

压力损失计算应从不利的环路(即距风机远的排风点)开始。

The calculation of pressure loss should start with the most disadvantageous loop (i.e. the farthest exhaust point from the fan).

对于袋式除尘器和电除尘器后的风管，应把除尘器的漏风及反吹风量计入。除尘器的漏风滤见有关的产品说明书，袋式除尘器的漏风率一般为5%左右。

For the air duct after bag filter and ESP, the air leakage and back-blowing of the dust collector should be counted. Leakage rate of bag filter is generally about 5%.

通风管道

Ventilating duct

4、对并联管路进行压力平衡计算。一般的通风系统要求两支管的压损差不超过15%，除尘系统要求两支管的压损差不超过10%，以保证各支管的风量达到设计要求。

4. Calculate the pressure balance of parallel pipeline. The general ventilation system requires that the pressure loss difference between the two pipes should not exceed 15%, and the dust removal system requires that the pressure loss difference between the two pipes should not exceed 10%, so as to ensure that the air volume of each branch pipe meets the design requirements.

从上面通风管道厂家的介绍可以看出，我们现在的通风管道颇受人们喜爱，现在通风管道已经成为我们身边随处可见的产品，大家对于通风管道有不懂的或者想咨询购买的，可以来电咨询我们，或者后台留言，我们会及时给您答复!

From the introduction of the above ventilation duct manufacturer, we can see that our ventilation duct is very popular now. Now the ventilation duct has become a product everywhere around us. If you don't know about the ventilation duct or want to consult and buy it, you can call us or leave a message in the background. We will reply to you in time.