局部排风系统管道设计常识

发布人： 发布时间：2018-06-27 16:13:38

局部排风系统的吸风支管一端是机上吸口，另一端在汇流三通处与干管相接，支管气流与干管气流在汇流三通处具有公共点称为两股气流的汇合点（如图1），两股气流在汇合点汇合，一般动压是不等的，但其静压相等。干管气流到达汇合点的静压称为剩余静压，它是汇合点的实际静压。吸口与汇合点的静压差是支管吸风的动力。对于形状和尺寸给定的支管，只要吸口状态和汇流三通汇合点处的静压一定，支管的吸风量就一定。支管吸口的状态以及支管的形状和尺寸确定之后，根据风量或风速，就可求得支管在汇流三通处的静压，称为该支管的计算静压。

One end of the suction pipe of the local exhaust system is on the suction port, the other end is connected with the dry pipe at the three pass of the confluence. The common point of the air flow and the dry pipe air flow at the three pass is called the confluence point of the two strand air flow (such as Figure 1). The two strands of air flow converge at the confluence point, and the general dynamic pressure is unequal, but the static pressure is equal. The static pressure at the junction point is called the residual hydrostatic pressure, which is the actual static pressure at the junction point. The static pressure difference between suction port and converging point is the power of branch suction. For the branch pipe with shape and size, the suction volume of the branch pipe must be fixed as long as the suction state and the static pressure at the junction point of the three way converge. After determining the state of the suction pipe and the shape and size of the branch pipe, the static pressure of the branch pipe at the three pass of the confluence can be obtained according to the wind volume or wind speed, which is called the calculation static pressure of the branch pipe.

各支管的形状和尺寸以及吸口状态都相同，如果给定的吸风量也相等，各支管的计算静压就相等。如果干管气流到达汇合点的剩余静压也相等，那么各支管的吸风量就相等，这就是所谓的静压恒定原理。如果干管气流到达汇合点的剩余静压不仅相等，而且等于各支管的计算静压，那么各支管的吸风量不仅相等，而且能按照给定的风量吸风，这就是均匀吸风原理。

The shape and size of each branch and the state of suction are the same. If the volume of suction is equal, the calculated static pressure of each branch is equal. If the residual static pressure at the junction point is equal, the suction capacity of each branch is equal. This is the so-called static pressure constant principle. If the remaining static pressure of the dry pipe flow to the confluence point is not only equal, it is equal to the static pressure of each branch pipe, then the suction volume of each branch is not only equal, but also can absorb the wind according to the given air volume. This is the principle of uniform suction.

就一般情况而言，对于任意形状和尺寸的支管以及任意给定的风量，只要求出各支管的计算静压，并使干管气流到达汇合点的剩余静压等于该支管的计算静压，则该支管就能按给定的风量吸风，这就是定量吸风原理。它对吸风管道的设计更具有普遍意义

As far as the general situation is concerned, for a branch with arbitrary shape and size and any given volume of wind, as long as the static pressure of each branch is calculated and the remaining static pressure of the air flow to the junction point is equal to the calculated static pressure of the branch, the pipe can absorb the wind according to the given air volume, this is the principle of quantitative air suction. It is more universal for the design of the suction pipe.

各支管的形状和尺寸以及吸口状态都相同，如果给定的吸风量也相等，各支管的计算静压就相等。如果干管气流到达汇合点的剩余静压也相等，那么各支管的吸风量就相等，这就是所谓的静压恒定原理。如果干管气流到达汇合点的剩余静压不仅相等，而且等于各支管的计算静压，那么各支管的吸风量不仅相等，而且能按照给定的风量吸风，这就是均匀吸风原理。

The shape and size of each branch and the state of suction are the same. If the volume of suction is equal, the calculated static pressure of each branch is equal. If the residual static pressure at the junction point is equal, the suction capacity of each branch is equal. This is the so-called static pressure constant principle. If the remaining static pressure of the dry pipe flow to the confluence point is not only equal, it is equal to the static pressure of each branch pipe, then the suction volume of each branch is not only equal, but also can absorb the wind according to the given air volume. This is the principle of uniform suction.

就一般情况而言，对于任意形状和尺寸的支管以及任意给定的风量，只要求出各支管的计算静压，并使干管气流到达汇合点的剩余静压等于该支管的计算静压，则该支管就能按给定的风量吸风，这就是定量吸风原理。它对吸风管道的设计更具有普遍意义

As far as the general situation is concerned, for a branch with arbitrary shape and size and any given volume of wind, as long as the static pressure of each branch is calculated and the remaining static pressure of the air flow to the junction point is equal to the calculated static pressure of the branch, the pipe can absorb the wind according to the given air volume, this is the principle of quantitative air suction. It is more universal for the design of the suction pipe.

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