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解决泵过载问题的方法主要有以下几种
一、解决泵过载问题的方法主要有以下几种：
First, there are several ways to solve the problem of pump overload:
(1) 采用机械式自动调压旁通阀。 旁通阀安装在罗茨真空泵的出口和入口之间的旁通管路上。此阀控制泵出入口之间的压差不超过额定值。当压差达到额定值时，阀门靠压差作用自动打开，使罗茨真空泵出口和入口相通，使出入口之间的压差迅速降低，这时罗茨真空泵在几乎无压差的负荷下工作。当压差低于额定值时，阀自动关闭，气体通过罗茨真空泵内由前级泵抽走。带有旁通溢流阀的罗茨真空泵可以与前级泵同时启动，使机组操作简单方便。
(1) The mechanical automatic pressure regulating bypass valve is adopted. The bypass valve is installed in the bypass pipeline between the outlet and the inlet of Roots vacuum pump. The pressure difference between the inlet and outlet of this valve control pump does not exceed the rated value. When the pressure difference reaches the rated value, the valve opens automatically by the pressure difference function, which makes the outlet and inlet of Roots vacuum pump communicate, and makes the pressure difference between the inlet and outlet decrease rapidly. At this time, Roots vacuum pump works under almost no pressure difference load. When the pressure difference is lower than the rated value, the valve closes automatically and the gas is pumped out by the front pump through the Roots vacuum pump. Roots vacuum pump with bypass relief valve can start at the same time with the front pump, which makes the operation of the unit simple and convenient.
(2) 采用液力联轴器 采用液力联轴器也能防止泵的过载现象发生，使泵可以在高压差下工作。液力联轴器安装在泵和电动机之间。在正常工作状态下，液力联轴器由电动机端向泵传递额定力矩。罗茨真空泵的最大压差由液力联轴器所传递的最大转矩来决定，而液力联轴器可传递的最大转矩由其中的液体量来调节。当泵在高压差下工作或与前级泵同时启动时，在液体联轴器内部产生了转速差即滑动，只传递一定的力矩，使泵减速工作。随着抽气的进行，气体负荷减小，罗茨真空泵逐渐加速至额定转速。
(2) The use of hydraulic coupling can also prevent the overload of the pump, so that the pump can work under high pressure difference. The hydraulic coupling is installed between the pump and the motor. Under normal working conditions, the hydraulic coupling transmits rated torque from the motor end to the pump. The maximum pressure difference of Roots vacuum pump is determined by the maximum torque transmitted by the hydraulic coupling, and the maximum torque transmitted by the hydraulic coupling is regulated by the amount of liquid in it. When the pump works under high pressure difference or starts at the same time with the front pump, the speed difference, i.e. sliding, occurs inside the liquid coupling, which only transmits a certain moment to slow down the pump. As the pumping proceeds, the gas load decreases, and the Roots vacuum pump gradually accelerates to the rated speed.
First, there are several ways to solve the problem of pump overload:
(1) 采用机械式自动调压旁通阀。 旁通阀安装在罗茨真空泵的出口和入口之间的旁通管路上。此阀控制泵出入口之间的压差不超过额定值。当压差达到额定值时，阀门靠压差作用自动打开，使罗茨真空泵出口和入口相通，使出入口之间的压差迅速降低，这时罗茨真空泵在几乎无压差的负荷下工作。当压差低于额定值时，阀自动关闭，气体通过罗茨真空泵内由前级泵抽走。带有旁通溢流阀的罗茨真空泵可以与前级泵同时启动，使机组操作简单方便。
(1) The mechanical automatic pressure regulating bypass valve is adopted. The bypass valve is installed in the bypass pipeline between the outlet and the inlet of Roots vacuum pump. The pressure difference between the inlet and outlet of this valve control pump does not exceed the rated value. When the pressure difference reaches the rated value, the valve opens automatically by the pressure difference function, which makes the outlet and inlet of Roots vacuum pump communicate, and makes the pressure difference between the inlet and outlet decrease rapidly. At this time, Roots vacuum pump works under almost no pressure difference load. When the pressure difference is lower than the rated value, the valve closes automatically and the gas is pumped out by the front pump through the Roots vacuum pump. Roots vacuum pump with bypass relief valve can start at the same time with the front pump, which makes the operation of the unit simple and convenient.
(2) 采用液力联轴器 采用液力联轴器也能防止泵的过载现象发生，使泵可以在高压差下工作。液力联轴器安装在泵和电动机之间。在正常工作状态下，液力联轴器由电动机端向泵传递额定力矩。罗茨真空泵的最大压差由液力联轴器所传递的最大转矩来决定，而液力联轴器可传递的最大转矩由其中的液体量来调节。当泵在高压差下工作或与前级泵同时启动时，在液体联轴器内部产生了转速差即滑动，只传递一定的力矩，使泵减速工作。随着抽气的进行，气体负荷减小，罗茨真空泵逐渐加速至额定转速。
(2) The use of hydraulic coupling can also prevent the overload of the pump, so that the pump can work under high pressure difference. The hydraulic coupling is installed between the pump and the motor. Under normal working conditions, the hydraulic coupling transmits rated torque from the motor end to the pump. The maximum pressure difference of Roots vacuum pump is determined by the maximum torque transmitted by the hydraulic coupling, and the maximum torque transmitted by the hydraulic coupling is regulated by the amount of liquid in it. When the pump works under high pressure difference or starts at the same time with the front pump, the speed difference, i.e. sliding, occurs inside the liquid coupling, which only transmits a certain moment to slow down the pump. As the pumping proceeds, the gas load decreases, and the Roots vacuum pump gradually accelerates to the rated speed.
