通风管的结构主要包括进风接管、出风口接管和弯头。
The structure of ventilation pipe mainly includes intake pipe, outlet nozzle and elbow.
1、进风口接管
1. Intake port nozzle
离心式通风机的进口管一般要变径，即圆形截面JDG金属穿线管 不锈钢链板 隔离墩模具 检查井钢模具 流水槽模具 阶梯护坡模具 护坡砖模具 遮板模具 变为矩形截面。并经过一个90°弯头因为离心式通风机的进口多制成圆形管，而在通风管系中，圆形管与矩形管比较，圆形管占有较大的空间，同时，圆形90°弯头比矩形90°弯头制作难度大，技术要求较高，因此在许多情况下，把抽风机的进口管制成矩形90°弯头。为了与抽风机的进口管连接，在圆形管与矩形管之间必须制作一个由圆形过渡到矩形的过渡接头。
The inlet pipe of centrifugal fan usually needs to change its diameter, that is, the circular section becomes a rectangular section. Because the inlet of centrifugal fan is mostly made into circular pipe through a 90 degree elbow, the circular pipe occupies more space than the rectangular pipe in the ventilation pipe system. At the same time, the circular 90 degree elbow is more difficult to make than the rectangular 90 degree elbow and has higher technical requirements. Therefore, in many cases, the inlet of the exhaust fan is made. Control into a rectangular 90 degree elbow. In order to connect with the inlet pipe of the exhaust fan, a transition joint from circular to rectangular must be made between the circular pipe and the rectangular pipe.
2、出风口接管
2. Outlet nozzle.
离心通风机的出口管，要转换方向时，最好与分机中空气的流动方向一致，如下图a所示。当出口管接头长度较短，曲率半径较小时，在弯头中领装导流板
The outlet pipe of a centrifugal fan should be in the same direction as the air flow in the extension when the direction is changed, as shown in figure a below. When the outlet joint length is short and the radius of curvature is small, the guide plate is installed in the elbow.