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罗茨真空泵的两个转子在泵体中如何布置
罗茨真空泵的两个转子在泵体中如何布置，决定了泵的总体结构。国内外罗茨真空泵的总体结构布置一般有三种方案:
How the two rotors of Roots vacuum pump are arranged in the pump body determines the overall structure of the pump. There are generally three schemes for the general layout of Roots vacuum pumps at home and abroad.
1.立式:两个转子的轴线呈水平安装，但两个转子轴线构成的平面与水平面垂直，这种结构，泵的进排气口呈水平设置，装配和连接管道都比较方便。但其缺点是泵的重心太高，在高速运转时稳定性差，所以除小规格的泵外，采用这种结构型式的不太多。
1. Vertical: The axes of two rotors are installed horizontally, but the plane formed by the axes of two rotors is perpendicular to the horizontal plane. This kind of structure makes the intake and exhaust ports of the pump horizontally arranged, and it is convenient to assemble and connect the pipelines. But its disadvantage is that the center of gravity of the pump is too high and its stability is poor at high speed, so there are not many pumps with this structure except small size ones.
2.卧式:两个转子的轴线呈水平安装，两个转子轴线构成的平面成水平方向，这种结构的泵的进气口在泵的上方，排气口在泵的下方(也有与此相反的)。下边的排气口一般为水平方向接出，所以进排气方向是相互垂直的。排气口接一个三通管向两个方向开口，一端接排气管道，另一端死或接旁通阀时使用。这种结构的特点是重心低，高速运转时稳定性好。国内外大中型泵多采用此种结构型式。
2. Horizontal: The axis of two rotors is installed horizontally, and the plane composed of the axis of two rotors is horizontally oriented. The intake port of the pump with this structure is above the pump and the exhaust port is below the pump (and vice versa). The lower exhaust port is usually connected in the horizontal direction, so the direction of intake and exhaust is vertical to each other. The exhaust port is connected with a three-way pipe to open in two directions, one end is connected with the exhaust pipe, and the other end is used when it is dead or connected with the bypass valve. The structure is characterized by low center of gravity and good stability at high speed. Large and medium-sized pumps at home and abroad mostly use this type of structure.
3.竖轴式:国外有的罗茨泵的两个转子轴线与水平面垂直安装。这种结构的装配间隙容易控制，转子装配方便，占地面积小，但齿轮等传动机构装拆不便，润滑装置也较复杂。
3. Vertical axis type: The two rotor axes of some roots pumps abroad are installed vertically with the horizontal plane. The assembly clearance of the structure is easy to control, the assembly of the rotor is convenient and the area occupied is small, but the assembly and disassembly of gears and other transmission mechanisms are inconvenient, and the lubrication device is also complex.
How the two rotors of Roots vacuum pump are arranged in the pump body determines the overall structure of the pump. There are generally three schemes for the general layout of Roots vacuum pumps at home and abroad.
1.立式:两个转子的轴线呈水平安装，但两个转子轴线构成的平面与水平面垂直，这种结构，泵的进排气口呈水平设置，装配和连接管道都比较方便。但其缺点是泵的重心太高，在高速运转时稳定性差，所以除小规格的泵外，采用这种结构型式的不太多。
1. Vertical: The axes of two rotors are installed horizontally, but the plane formed by the axes of two rotors is perpendicular to the horizontal plane. This kind of structure makes the intake and exhaust ports of the pump horizontally arranged, and it is convenient to assemble and connect the pipelines. But its disadvantage is that the center of gravity of the pump is too high and its stability is poor at high speed, so there are not many pumps with this structure except small size ones.
2.卧式:两个转子的轴线呈水平安装，两个转子轴线构成的平面成水平方向，这种结构的泵的进气口在泵的上方，排气口在泵的下方(也有与此相反的)。下边的排气口一般为水平方向接出，所以进排气方向是相互垂直的。排气口接一个三通管向两个方向开口，一端接排气管道，另一端死或接旁通阀时使用。这种结构的特点是重心低，高速运转时稳定性好。国内外大中型泵多采用此种结构型式。
2. Horizontal: The axis of two rotors is installed horizontally, and the plane composed of the axis of two rotors is horizontally oriented. The intake port of the pump with this structure is above the pump and the exhaust port is below the pump (and vice versa). The lower exhaust port is usually connected in the horizontal direction, so the direction of intake and exhaust is vertical to each other. The exhaust port is connected with a three-way pipe to open in two directions, one end is connected with the exhaust pipe, and the other end is used when it is dead or connected with the bypass valve. The structure is characterized by low center of gravity and good stability at high speed. Large and medium-sized pumps at home and abroad mostly use this type of structure.
3.竖轴式:国外有的罗茨泵的两个转子轴线与水平面垂直安装。这种结构的装配间隙容易控制，转子装配方便，占地面积小，但齿轮等传动机构装拆不便，润滑装置也较复杂。
3. Vertical axis type: The two rotor axes of some roots pumps abroad are installed vertically with the horizontal plane. The assembly clearance of the structure is easy to control, the assembly of the rotor is convenient and the area occupied is small, but the assembly and disassembly of gears and other transmission mechanisms are inconvenient, and the lubrication device is also complex.
