Specific implementation of the electromagnetic clutch: Referring to FIG. 1, there is shown an end view of the electromagnetic clutch 10 in an open position state in one embodiment. The electromagnetic clutch extends along a rotating shaft that is perpendicular to the plane shown in FIG. 1. The clutch includes a rotor on which a coil is wound. The wound rotor has a circumferential outer surface, which is formed by a plurality of toothed elements. The toothed elements are evenly distributed on the circumference of the rotor, and a groove is formed between every two adjacent toothed elements. The groove has a bottom surface 18 and an ascending side formed by one side of the toothed element. The ascending side meets the top surface of the toothed element. The rotor is surrounded by a cylindrical element, which also rotates about the axis of rotation. On the inner surface of the cylindrical element, several elastic thin plate elements fixed thereon are evenly distributed. Each thin plate element is provided with an insertion part, and the geometry of the insertion part can be engaged in the groove, especially the shape of each insertion part can be It fits into the bottom surface, gradually increasing side and top surface. In the embodiment shown in FIG. 1, the electromagnetic clutch is in an open position, in which the cylindrical element rotates in a clockwise direction shown by an arrow. Due to the rotation and the coil is not energized at the same time, the inserted part will not be attracted by the electromagnetic force. At this time, the inserted part is separated from the groove by the centrifugal force and the rotating toothed element. Therefore, the electromagnetic clutch no longer transmits momentum and rotational displacement.
FIG. 2 shows an end view of the same electromagnetic radiation plate clutch as in FIG. 1 in a closed position or a contact position, in which the insertion portions of the thin plate elements are engaged in the grooves of the rotor. The insertion part is adapted to be connected to the bottom surface and the gradually increasing side surface. In this closed position or contact position state, the clutch can transmit the torque or momentum acting on the rotor to the cylindrical element, which is affected by the electromagnetic force generated by the coil. The insertion part is held in the groove at the contact position. In order to increase the magnetic flux of the coil, the insertion part contains a magnetic material that pre-presses each thin plate element, so that even if no electromagnetic force acts on the thin plate element, it can also be used in It is placed in the groove under the action of mechanical force.
Fig. 3 shows a schematic partial end view of an electromechanical actuator connected to a valve. Preferably, the valve is a control valve, an emergency shut-off valve, or a control-closing combination valve of a steam turbine for regulating the primary steam introduced into the steam turbine. The valve includes a steam inlet and a steam outlet, and a steam seat is arranged between the two. The valve also includes a valve piston, which is acted by the spring force of a valve spring. One end of the valve is placed on the valve seat to close the valve. This means that the fluid connection between the valve outlet of the valve inlet is blocked. A force applied to the valve piston can overcome the force applied by the valve spring, which causes the valve piston to move in an axial direction in a controlled manner until the valve is opened, thereby adjusting the amount of steam passing through the valve.
In order to move the valve piston in a controlled manner, it is connected to an electromechanical actuator. The electromechanical actuator includes a motor having a motor shaft and a multi-stage transmission device, the multi-stage transmission device is provided with a transmission shaft, and the transmission shaft is rigidly connected with the rotor of the electromagnetic clutch shown in FIGS. 1 and 2. In the illustrated embodiment, both the rotor and the transmission shaft actually form a shaft. Several toothed elements extending along the rotation axis are evenly distributed on the rotor. The rotating shaft is a symmetry axis of the rotor and the transmission shaft. The rotor is surrounded by a cylinder carrying a thin plate element on the inner surface. The cylindrical element is at least partially immersed in the oil reservoir, and the outer surface may be provided with some fins or other damping elements. The cylindrical element and the crank disk with crank fins are connected by press fitting, especially rigidly. On this crank fin, one end of the push rod is connected to the crank disc and the other end is connected to the rocker arm. One side of the rocker arm is connected to the push rod and the other side is connected to the valve piston. The arm length is longer than the arm length of the rocker arm connected to the valve piston. Due to the action of the rocker lever, a smaller force acting on the push rod produces a larger force acting on the valve piston. In order to overcome the spring force of the valve spring in the closed position, in order to adjust the amount of steam actually refers to moving the valve piston, the electromagnetic clutch only needs to transmit a smaller amount of momentum than when there is no rocker arm, which makes it possible to create a space-saving electromagnetic clutch and cause Actuator.
For more details, please visit the sixth section of electromagnetic clutches, electromechanical actuators and turbines http://cryptomineassets.com/XWDT/237.html