公开(公告)号：US3822612A

公开(公告)日：1974-07-09

申请号：US32995073

申请日：1973-02-05

申请人： WORCESTER CONTROLS CORP

发明人： SANCTUARY R

IPC分类号： F16K31/04 ,  C11D17/00

CPC分类号： F16K31/045 ,  Y10T477/333 ,  Y10T477/337

摘要： An electric actuator for varying the position of a valve stem comprises an output shaft adapted to be coupled to the valve stem. The output shaft is selectively rotated, between limit positions defined by a pair of electrical limit switches cooperating with cams carried by the output shaft, through the agency of a motor module comprising one or more electric motors and an associated gear box having an output pinion in drive engagement with an output gear coupled to the output shaft. The output gear includes two sets of concentric teeth disposed in spaced relation to one another, and adapted to be engaged individually by the motor module pinion, for driving the output shaft at different torques and speeds in dependence upon which set of output gear teeth is engaged by the pinion. The motor module can be mounted in either of two different positions to cause its pinion to engage one or the other of the output gear teeth sets. The output pinion is preferably located at an eccentric position relative to the motor module so that pinion engagement can be shifted from one to the other of the gear teeth sets by a 180* reversal in the motor module mounting position.

摘要翻译： 用于改变阀杆的位置的电致动器包括适于联接到阀杆的输出轴。 输出轴在由包括一个或多个电动机的电动机模块和相关联的齿轮箱的组合中选择性地旋转，所述极限位置由与由输出轴承载的凸轮配合的一对限位开关限定，所述电机模块包括输出小齿轮 与输出轴联接的输出齿轮驱动接合。 输出齿轮包括两组彼此间隔设置的同心齿，并且适于由马达模块小齿轮单独地接合，用于根据哪组输出齿轮齿接合而以不同的转矩和速度驱动输出轴 通过小齿轮。 电动机模块可以安装在两个不同位置中的任何一个中，以使其小齿轮啮合一个或另一个输出齿轮齿组。 输出小齿轮优选地位于相对于电动机模块的偏心位置处，使得小齿轮接合可以在电动机模块安装位置中从齿轮齿组中的一个向另一个移动180°反转。