One purpose of this product is to provide an electromechanical actuator with a space-saving, fast-moving and very inexpensive electromagnetic clutch, and another object is to provide an electromechanical actuator for valves and turbines, especially steam turbines, which The steam turbine has a valve for regulating the amount of fluid flow, and this regulation is operated by an electromechanical actuator.
In view of the above and other purposes, this product provides an electromagnetic radiation plate clutch for an electromechanical actuator, especially an electromechanical actuator for a valve. The electromagnetic clutch includes a rotor having a rotating shaft and a circumferential outer surface having at least one groove, a cylindrical element surrounds the rotor, and at least one thin plate element is fixed on the cylindrical element, and the thin plate element An insertion member is provided to place it into the groove.
The electromagnetic clutch also includes a coil for holding at least one thin plate element in the groove. Preferably, the electromagnetic clutch includes a plurality of radiating plates and thin plates, which are nearly flat single-layer elastic thin plates, disposed between the cylindrical element and the rotor. Preferably, one end of the thin plate element is fastened in the cylindrical element. The other end is provided with an insertion part, which is placed in the groove under the effect of the electromagnetic force generated by the coil. When the insertion part is placed in the groove, the electromagnetic clutch is in a running state, so the rotor connected to the motor The rotation of the cylindrical element can be forced to rotate with it, and the rotary motion of the cylindrical element can be converted into the axial movement of the valve piston rod.
Another technical feature of this product is that at least one sheet metal element is pre-compressed to mechanically insert the insertion portion into the groove. By pre-pressing the thin plate element, the insertion part can be always placed in the groove under normal conditions, and is closely adjacent to the groove due to the electromagnetic force generated by the coil. Once the circuit of the coil is disconnected, such as when steam When the turbine is stopped as soon as its required valve is closed, the electromagnetic force that sucks the insertion part and keeps it in the groove disappears. Therefore, by the rotation of the rotor, the insertion part is forced out of the groove, and the rotor and The fitting connection and the press-fit connection between the cylindrical elements are then released. Once the rotation of the rotor stops, the insertion part will be inserted into the groove again by the fitting connection method due to the pre-pressing configuration of the thin plate element.
Another technical feature of this product is that the insertion part contains a magnetic material, and the magnetic flux of the coil will increase due to the magnetic material provided in the insertion part, so that when the electromagnetic force on the insertion part is increased, the press-fit connection The situation has also improved. The insertion portion may be composed of a magnetic material, or a magnetic material covering layer may be provided. The coil is wound on the rotor. The aforementioned groove is provided with a bottom surface and a gradually increasing side surface, and the insertion portion is at least partially in contact with the bottom surface and the gradually increasing side surface. By geometrically designing the groove and the insertion portion, they can be closely fitted. Therefore, the momentum that can be transmitted by the clutch is increased. The gradually increasing side slope affects the clutch's suction power and the safety of release. The slope value can be determined according to the requirements of the clutch. The ascending sides converge to the top of the outer surface area, whereby preferably the insertion portion is also at least partially in contact with the top. In this way, the adaptation between the peripheral outer surface regions, especially between the grooves and the thin plate elements, is further improved. The groove is the interval between two toothed elements. The toothed elements, especially several toothed elements, are preferably distributed along the circumference of the rotor to form a circumferential outer surface with at least one groove, and the rotor will have gears. shape.
For this purpose, we provide an electromechanical actuator that will always be used for valves with a valve piston, which includes a motor, an electromagnetic radiation plate clutch, and a push rod, one end of which is connected to the crank disk of the clutch The other end can be connected to the valve piston of the valve. The electromagnetic radiation plate clutch includes a rotor having a rotating shaft and a circumferential outer surface having at least one groove and connected to the motor, and a cylindrical element surrounding the rotor. At least one thin plate element is fixed on the thin plate element, and the thin plate element is provided with an insertion part to be placed in the groove. In addition, the electromagnetic clutch also includes a coil for holding the thin plate element in the groove, and a cylinder connected to Crank disk on the shaped element. The electromechanical actuator can perform a reliable immediate closing operation on the valve according to the situation, for example, when the steam turbine suddenly stops, at this time, the rotor and the cylindrical element are disconnected by the electromagnetically attracted radiating plate clutch. The rotation speed of the cylindrical element is greatly increased, so the centrifugal force acting on the thin plate can cause the thin plate element to disengage and rise from the groove due to the mechanical force generated by the preload. The process of disconnecting the end makes the valve reach In the closed position, once the cylindrical element stops moving, the mechanical force generated by pre-pressing the thin plate element acts again, so that the thin plate element engages the groove again to make it fit and connect. If the valve closes suddenly, the cylindrical element stops and the valve reaches the closed position, and the motor is cut off.