| 摘要 |
When a valve-controlled pump is to produce either vacuum or pressure at a pump outlet 9 as a function of its direction of rotation it is necessary that a 3/2-way valve be switched as a function of the direction of rotation of the motor of the pump. In accordance with the invention this is effected by a direction detection device on the motor (1) which is coupled with the motor for the control of the 3/2-way valve. The direction detection device is formed in the manner that the motor housing of the motor (1) is mounted for rotation and is provided at its end with a structural part (11) having a control kidney (10) which is movable over a control surface (7). Since the motor housing must take up the counter moment when the motor is rotating, the control kidney (10) shifts upon the starting of the motor (1) into one of its two end positions depending on the direction of rotation of the motor (1), thereby causing the pump outlet (9) to be connected alternatively to pressure or vacuum.
|
