30results about How to "No electromagnetic noise" patented technology

The invention discloses a double-piezoelectric beam driven diaphragm pump, belonging to the technical field of micro fluid pump in precision machinery, comprising a cavity, two double-piezoelectric beams, a diaphragm with one-way valve and electrodes, where one end of each double- piezoelectric beam is fixedly supported and the other end is connected with the side of the diaphragm, an AC voltage is applied on the double- piezoelectric beams in the cavity to drive the diaphragm to vibrate at resonance point, and under the action of the one-way valve on the diaphragm, the air flows in a direction to exchange with external gas. And it has many advantages of simple structure, large output flow, low power consumption, small size of side surface, no electromagnetic noise, fewer active parts, high reliability, etc, easy to spread and apply.

The invention discloses an ultra-silent rolling-swinging switched reluctance motor. Two lateral-acting guide rails (6) are longitudinally arranged on a planar-frame-form base (7), a rubber spring (12) is mounted on each of two sides of each guide rail (6), a C-shaped magnet (10) is mounted on each rubber spring (12) in a mutual-mirroring manner, an excitation coil (11) is mounted on the C-shaped magnet (10), an arch-shaped swing wheel (1) is mounted on each of two longitudinal sides of a planar-frame-form top frame (2) in a stacked manner, the arch-shaped swing wheels (1) and the guide rails (6) are matched to enable the top frame (2) not to longitudinally move when the swing wheels roll and swing leftwards and rightwards, an armature (3) is mounted on each of two sides of each arch-shaped swing wheel (1), and the armatures (3) enter the middle of the C-shaped magnet (10) when the top frame (2) rolls to a preset position on one side from a central balance position. The ultra-silent rolling-pendulum switched reluctance motor is simple in structure, safe and reliable to run and ultra-silent, integrates a rolling mode with a swinging mode and can be matched with equipment like various infant bassinets, adult rocking chairs, couches, shaking beds, wooden horses or industrial sieves.

The invention discloses a speed control device of an outdoor draught fan of an air conditioner. The speed control device of the outdoor draught fan of the air conditioner comprises a driving circuit, a transformer with multiple levels of outputs, a contactor and a switching control module. According to the speed control device of the outdoor draught fan of the air conditioner, the transformer with the multiple levels of outputs is adopted, switching of the different levels of outputs of the transformer is achieved through the controllable contactor when the device works, and the switching control module carries out control switching on the contactor based on detected working pressure of the air conditioner so that the draught fan can correspondingly work under the condition of different voltages and then can operate at corresponding rotating speeds and be matched with the working pressure of the air conditioner. The speed control device of the outdoor draught fan of the air conditioner has the advantages of being low in cost and free of influence of electromagnetic noise during work. Compared with a chopping voltage reducing speed control device, the speed control device of the outdoor draught fan of the air conditioner has the advantages of being capable of reducing cost, free of low-frequency noise and low in failure rate.

The invention provides a pneumatic engaging and disengaging device for an overhead cigarette carton conveying line. The pneumatic engaging and disengaging device is sleeved on a main shaft through a steel sleeve, and comprises a plastic annular cylinder, a plastic movable gear and a plastic fixed gear, wherein the plastic annular cylinder is assembled on the steel sleeve through a big cylinder bearing and a small cylinder bearing; a plastic chain wheel is assembled on the steel sleeve through a chain wheel bearing; the plastic fixed gear is assembled on the plastic chain wheel and positioned on one side of the plastic annular cylinder; the plastic movable gear is positioned in the plastic fixed gear and contacted with the big cylinder bearing; a spring is positioned in the plastic movablegear and connected with one end of a spring head; the other end of the spring head is pressed against the chain wheel bearing; a forward buffer device is positioned in the plastic chain wheel; and a backward buffer device is positioned in the plastic fixed gear. By adopting a pure mechanical mode, the device has the advantages of high transfer force of single-way engagement and disengagement, high torque, no electromagnetic noise, no need of electric wire, no influence of current and voltage and capability of improving weather resistance, stability and greatly prolonging service life.