局部排風(fēng)系統(tǒng)管道設(shè)計(jì)知識

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局部排風(fēng)系統(tǒng)的吸風(fēng)支管一端是機(jī)上吸口，另一端在匯流三通處與干管相接，支管氣流與干管氣流在匯流三通處具有公共點(diǎn)稱為兩股氣流的匯合點(diǎn)（如圖1），兩股氣流在匯合點(diǎn)匯合，一般動壓是不等的，但其靜壓相等。干管氣流到達(dá)匯合點(diǎn)的靜壓稱為剩余靜壓，它是匯合點(diǎn)的實(shí)際靜壓。吸口與匯合點(diǎn)的靜壓差是支管吸風(fēng)的動力。對于形狀和尺寸給定的支管，只要吸口狀態(tài)和匯流三通匯合點(diǎn)處的靜壓一定，支管的吸風(fēng)量就一定。支管吸口的狀態(tài)以及支管的形狀和尺寸確定之后，根據(jù)風(fēng)量或風(fēng)速，就可求得支管在匯流三通處的靜壓，稱為該支管的計(jì)算靜壓。

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.

各支管的形狀和尺寸以及吸口狀態(tài)都相同，如果給定的吸風(fēng)量也相等，各支管的計(jì)算靜壓就相等。如果干管氣流到達(dá)匯合點(diǎn)的剩余靜壓也相等，那么各支管的吸風(fēng)量就相等，這就是所謂的靜壓恒定原理。如果干管氣流到達(dá)匯合點(diǎn)的剩余靜壓不僅相等，而且等于各支管的計(jì)算靜壓，那么各支管的吸風(fēng)量不僅相等，而且能按照給定的風(fēng)量吸風(fēng)，這就是均勻吸風(fēng)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.

就一般情況而言，對于任意形狀和尺寸的支管以及任意給定的風(fēng)量，只要求出各支管的計(jì)算靜壓，并使干管氣流到達(dá)匯合點(diǎn)的剩余靜壓等于該支管的計(jì)算靜壓，則該支管就能按給定的風(fēng)量吸風(fēng)，這就是定量吸風(fēng)原理。它對吸風(fēng)管道的設(shè)計(jì)更具有普遍意義

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.

各支管的形狀和尺寸以及吸口狀態(tài)都相同，如果給定的吸風(fēng)量也相等，各支管的計(jì)算靜壓就相等。如果干管氣流到達(dá)匯合點(diǎn)的剩余靜壓也相等，那么各支管的吸風(fēng)量就相等，這就是所謂的靜壓恒定原理。如果干管氣流到達(dá)匯合點(diǎn)的剩余靜壓不僅相等，而且等于各支管的計(jì)算靜壓，那么各支管的吸風(fēng)量不僅相等，而且能按照給定的風(fēng)量吸風(fēng)，這就是均勻吸風(fēng)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.

就一般情況而言，對于任意形狀和尺寸的支管以及任意給定的風(fēng)量，只要求出各支管的計(jì)算靜壓，并使干管氣流到達(dá)匯合點(diǎn)的剩余靜壓等于該支管的計(jì)算靜壓，則該支管就能按給定的風(fēng)量吸風(fēng)，這就是定量吸風(fēng)原理。它對吸風(fēng)管道的設(shè)計(jì)更具有普遍意義

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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