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The oil in the working chamber is vented from the pump drain port to the casing of the casing to form a rotating oil ring, so that the radial expansion and contraction of the spoon can be controlled by the governor of the fluid coupling, and the oil ring in the casing can be arbitrarily changed. The thickness, that is, the amount of oil in the working chamber is changed to achieve stepless adjustment of the output speed, and the oil discharged from the scoop tube is returned to the tank through the oil drainer. When manual speed regulation is selected, the valve position output value of the control coupling spoon position is slowly given on the upper part. The valve position output value is converted into a wind pressure signal of the upper and lower position of the control spoon tube after a current signal is sent to the field. Therefore, the purpose of speed regulation is also the same. When automatic speed regulation is selected, the target speed value of the compressor is directly given on the upper part, and the unit is slowly adjusted according to the specific speed increment. The speed increment is also a current signal. After entering the scene, it is converted into a wind pressure signal that controls the movement of the upper and lower values ​​of the spoon tube, so that the unit slowly reaches the target speed value.
Considering the characteristics of the critical speed zone of the compressor unit, and because the first critical speed value of the unit is to avoid resonance when crossing the zone during the speed rise and fall of the unit, it has a very adverse effect on the normal operation of the unit, so the speed control is carried out. The program inputs a specific speed adjustment value to ensure that the unit passes through the danger zone quickly, that is, when the unit crosses the critical section, the unit's speed is incremented and decremented, and otherwise. At the same time, in the process of speed rise and fall of the unit, the adverse effects caused by the misoperation factors are also taken into consideration. In the control program, all the operational commands when the unit is operating in the critical speed zone are invalid. This fundamentally eliminates the adverse effects of the critical speed on the unit and ensures smooth operation of the unit. Key effects of control effect analysis safety and high continuous availability provide an optimal choice. The combination of the two ensures the safe and safe operation of the unit, while also ensuring the stability and superior operation of the entire process.
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