本实用新型涉及真空获得设备，特别是滑阀式真空泵中滑阀的改进。
The utility model relates to a vacuum gaining device, in particular to the improvement of a sliding valve in the sliding spool vacuum pump.
滑阀真空泵是一种容积式真空泵，在各工业领域广泛应用。但该泵的旋转活塞平衡长期以来无精确计算方法。
Rotary piston pump is a volume type vacuum pump and is applied widely, but there has been no method for exactly calculating dynamic balance of rotary piston up to the present.
罗茨式真空泵，罗茨螺杆机组，罗茨旋片机组，罗茨水环机组，罗茨滑阀机组，移动式真空机组等。
Roots Vacuum Pumps, Roots and Vane Systems, Roots and Water-ring Systems, Roots and Piston Systems, Moves Freely Vacuum Systems and so on.
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