Roots blower is a volume rotary blower. The compressor keeps the two rotors engaged by the synchronous gear at the rotor shaft end. Each concave curved surface on the rotor forms a working volume with the inner wall of the cylinder. During the rotation of the rotor, the gas is taken away from the intake port. When the rotor moves to the exhaust port near which it is connected with the exhaust port, the pressure in the working volume rises suddenly due to the backflow of high pressure gas, and then the gas is transported to the exhaust channel. The two rotors do not contact each other, and they are sealed by a tightly controlled gap, so the discharged gas is not polluted by lubricating oil.

罗茨鼓风机怎样进行空负荷运行和正常负荷运行？

How does Roots blower operate with no load and normal load?

（1）鼓风机空负荷试运转。

(1) Air blower no-load test run.

1）新安装或大修后的风机都应经过空负荷试运转。

1) The newly installed or overhauled fans shall undergo no-load test run.

2）罗茨鼓风机空负荷运转的概念：在进排气口阀门全部打开的条件下投入运转。

2) The concept of no-load operation of Roots blower: put it into operation when all the inlet and outlet valves are open.

3）试运转时应注意观察润滑油的飞溅情况是否正常，如过多或过少则应调节油量。

3) During the test run, pay attention to whether the splash of lubricating oil is normal. If it is too much or too little, adjust the oil volume.

4）没有不正常的气味或冒烟现象及碰撞或摩擦声，轴承部位的径向振幅不大于0.08mm。

4) There is no abnormal smell or smoke, collision or friction sound, and the radial amplitude of the bearing is not greater than 0.08mm.

5）空负荷运行30分钟左右，如情况正常即投入带负荷运转。如发现运转不正常应立即进行检查，排除故障后仍需作空负荷运转。

5) Operate with no load for about 30 minutes. If the condition is normal, operate with load. If it is found that the operation is abnormal, it shall be checked immediately, and the no-load operation is still required after the fault is eliminated.

（2）鼓风机正常带负荷运转

(2) The blower operates normally with load

1）按要求逐步缓慢地调节，带上负荷直到额定负荷。不允许一次即调额定负荷。

1) Gradually and slowly adjust as required, and load until rated load. It is not allowed to adjust to rated load at one time.

2）所谓额定负荷系指铭牌所标的进排气口之间的静压差。在排气口压力正常的情况下，需要注意进气口的压力变化，以免超负荷。

2) The so-called rated load refers to the static pressure difference between the air inlet and exhaust ports marked on the nameplate. When the pressure at the exhaust port is normal, pay attention to the pressure change at the air inlet to avoid overload.

3）由于罗茨鼓风机的特性，不允许将排气口的气体长时间地直接回流入鼓风机的进气口中，否则将会影响机器的。

3) Due to the characteristics of Roots blower, it is not allowed to directly return the gas from the exhaust port to the air inlet of the blower for a long time, otherwise the safety of the machine will be affected.

4）风机正常工作中，严禁完全关闭进排气口听阀门，也不准超负荷运行。

4) During the normal operation of the fan, it is strictly forbidden to completely close the air inlet and outlet valves, nor to overload operation.

5）鼓风机的额定工况下运行时，各滚动轴承的表面温度一般不超过85℃，油箱内润滑油油温不般不超过65℃，在靠近轴承部位的径向振动不超过0.08mm。

5) When the blower operates under rated working condition, the surface temperature of each rolling bearing generally does not exceed 85 ℃, the lubricating oil temperature in the oil tank does not generally exceed 65 ℃, and the radial vibration near the bearing does not exceed 0.08mm.

6）要经常注意润滑油的飞溅情况及油量位置。

6) Always pay attention to the splash of lubricating oil and the position of oil volume.

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