离心风机由叶轮、机壳、进气口、传动组、机座等组成，在电机的驱动下，离心机转子高速旋转产生强大的离心力，使从进气口吸入的气流在机壳内产生离心运动，然后从出风口一侧送出。通常用于工矿企事业单位的空气净化、除尘、通风换气。由于制造误差、材质不均等原因，风机运行时，每个叶片和叶轮上的气流作用力不同，因此其合力不能等于零。这样就产生了气动干扰力。

The centrifugal fan is composed of impeller, casing, air inlet, transmission group, base, etc. driven by the motor, the centrifuge rotor rotates at high speed to produce strong centrifugal force, so that the air flow inhaled from the air inlet generates centrifugal movement in the casing, and then is sent out from one side of the air outlet. It is usually used for air purification, dust removal and ventilation in industrial and mining enterprises and institutions. Due to manufacturing errors and uneven materials, when the fan is running, the air flow force on each blade and impeller is different, so the resultant force cannot be equal to zero. This produces aerodynamic interference force.

济南离心风机为什么会出现气动干扰力?

Why does Jinan centrifugal fan have aerodynamic interference force?

1、 叶片差引起的干涉力

1. Interference force caused by blade difference

叶轮制造中存在误差，如每个叶片的角度和方向，以及轮盘和轮罩的间隙可能不同。由于产量不同，每个叶片在运行期间接收的气体反作用力之和不等于零，导致空气动力干扰力。气动干扰力随转速和风量的增加而变大。

There are errors in impeller manufacturing, such as the angle and direction of each blade, and the clearance between wheel disc and wheel housing may be different. Due to different output, the sum of gas reaction forces received by each blade during operation is not equal to zero, resulting in aerodynamic interference force. The aerodynamic interference force increases with the increase of rotating speed and air volume.

2、 轮盘与轮罩的晃动干涉

2. Shaking interference between wheel disc and wheel housing

轮盘和轮罩的端面跳动应控制在一定的要求范围内，以减少震动造成的干扰。轮盘和轮罩的振动会在轴向上产生周期性的干扰力，壳体也会通过空气传输产生振动。

The end face runout of the wheel disc and wheel housing shall be controlled within a certain range to reduce the interference caused by vibration. The vibration of wheel disc and wheel housing will produce periodic interference force in the axial direction, and the shell will also produce vibration through air transmission.

3、 反馈气流的扰动力

3. Disturbing force of feedback air flow

风扇的叶轮和收集器(进气口)之间有一定的间隙。该间隙的存在将使部分气流回流。这部分气流可以称为反馈气流。反馈气流的稳定性也会影响风扇的振动。因此，在安装过程中，叶轮与进气口之间的间隙应均匀，并保证重叠。其目的是至小化并稳定反馈气流，从而降低风机的振动。一般来说，反馈气流越小，风扇效率越高，反之，风扇效率低。

There is a certain clearance between the impeller of the fan and the collector (air inlet). The existence of this gap will make part of the air flow return. This part of the air flow can be called feedback air flow. The stability of the feedback air flow will also affect the vibration of the fan. Therefore, during installation, the clearance between the impeller and the air inlet shall be uniform and the overlap shall be ensured. The purpose is to minimize and stabilize the feedback air flow, so as to reduce the vibration of the fan. Generally speaking, the smaller the feedback air flow, the higher the fan efficiency. On the contrary, the fan efficiency is low.

4、 套管内压力分布差异

4. Pressure distribution difference in casing

叶轮运行时，输送的空气量相同，但受壳体限制，空气只能向一个方向移动。因为外壳各部分的气压不同。如果济南离心风机在稳定状态下运行，风机中的压力分布相对稳定，对风机的振动干扰相对较小。但是，随着运行条件的变化，如转速、风门开度等，风机中的压力分布会发生变化，从而导致振动变化。这是改变阻尼器和转速时振动增加或减少的原因之一。干扰存在于运行状态的变化中。

When the impeller is running, the amount of air delivered is the same, but limited by the shell, the air can only move in one direction. Because the air pressure of each part of the shell is different. If Jinan centrifugal fan operates in a stable state, the pressure distribution in the fan is relatively stable and the vibration interference to the fan is relatively small. However, with the change of operating conditions, such as speed and damper opening, the pressure distribution in the fan will change, resulting in the change of vibration. This is one of the reasons why the vibration increases or decreases when changing the damper and speed. Interference exists in the change of operating state.

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