Centering-type water pump vane adjusting device

The utility model belongs to the technical field of water pump vane adjusting devices, in particular to a centering-type water pump vane adjusting device. The centering-type water pump vane adjusting device comprises a water pump servomotor and a pressure distribution valve connected with the water pump servomotor through an oil way and further comprises a centering device, a displacement sensor used for detecting the stretch-out position of a piston rod of the water pump servomotor and a controller. The centering device comprises a supporting body fixedly connected with the pressure distribution valve and further comprises an adjusting rod with the bottom end fixedly connected with a valve needle of the pressure distribution valve, wherein a stepping motor is fixedly connected to the top of the supporting body, a ball screw is fixedly connected to the bottom end of a motor shaft of the stepping motor, and the top end of the adjusting rod is fixedly connected with a nut of the ball screw. The stepping motor a