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

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.

Provided is a wind power generation system. A homopolar electromagnetic transmission (HET) is adopted as infinitely variable speed and variable torque transmission equipment, the HET is directly connected with a wind wheel and an electric generator, a step-up gearbox is arranged between the wind wheel and the HET, the wind wheel can be in a horizontal shaft type or in a vertical shaft type, the horizontal shaft type wind wheel can be provided with fixed-pitch blades or variable-pitch blades, and the electric generator can be a conventional constant-speed moving synchronous electric generator or asynchronous generator. The operation of the system is mainly adjusted and controlled by the HET, and the wind wheel keeps the optimal tip speed ratio and variable rotation speed to operate under the conventional operation conditions. The wind power generation system has the advantages that the infinitely variable speed and variable torque transmission function with the rotation speed of the two ends being free and not limited is achieved; the flexible transmission connection isolates the bidirectional transferring of impact loads; the largest wind energy capturing efficiency is obtained; the power supply quality is high; the HET is higher in efficiency, lower in cost and small in electromagnetic interference, and does not generate electromagnetic noise and harmonic waves.

The invention provides an air conditioner, an alternating current motor and a speed adjusting device thereof. The alternating current motor speed adjusting device comprises that: a main speed regulation unit, wherein, an input terminal forms a main speed regulation input terminal which is connected with a controller, and an output terminal forms a main speed regulation output terminal which is connected with a plurality of live wire terminals of the alternating current motor; an auxiliary speed regulation unit which comprises a first branch and at least a second branch, wherein, the first branch and the second branch have a respective input terminal and a common output terminal, and the common output terminal forms an auxiliary speed regulation output terminal which is connected with a zero line of the alternating current motor; a shift selector, wherein, an input terminal of the shift selector forms an auxiliary speed regulation input terminal which is connected with the controller, and an output terminal is selectively connected with one of the respective input terminal of the first branch and the second branch, wherein, the first branch is a direct connecting branch and the second branch is a capacitive branch. According to the air conditioner, the alternating current motor and the speed adjusting device of the invention, a problem of electromagnetic noise when utilizing a chopper speed regulation principle to carry out speed regulation on a present alternating motor in the prior art is solved.

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 movable gear 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.

This invention refers to a method for making a device for neutralizing surface static electricity on liquid crystal and semiconductor chip using positive /negative ion generated by x-ray radiating air and soft x-ray tube thereof. Said invention contains head part for anti-static electricity of directly ionizing gas molecular, protector for protecting operator, power source control part for controlling filament current and target voltage used for controlling ion generation and soft x-ray tube for generating high energy x-ray. Said soft x-ray tube is made by firstly producing ceramic tube metal spray film, then coating anode material on beryllium window board, electroplating tungsten on beryllium window, finally making high vacuum brazing. Said invention can neutralize static electricity in combustible powder.

The invention discloses a controller of a non-position sensor direct current (DC) brushless electric fuel pump for an automobile. The controller provided by the invention can be used for providing stable and reliable operational control, and comprises a microprocessor, a power module, an input module, a driving module and a brushless DC motor, wherein the input module comprises a system voltage collected module and a current and reverse electromotance collection module; and the driving module comprises a A-phase driving module, a B-phase driving module and a C-phase driving module. By virtue of measuring the negative zero crossing points of A-phase reverse electromotance, B-phase reverse electromotance and C-phase reverse electromotance and computing the phase change time of the three phase, the phase change control of the non-position sensor DC brushless electric fuel pump can be carried out, simultaneously the voltage protection, current protection and temperature protection functions of a system can be realized, and the system can be ensured to operate safely and reliably.

The invention discloses a liquid-cooling heat dissipation device of a headset and the headset with high heat dissipation. The liquid-cooling heat dissipation device comprises a shell and a heat-conducting medium arranged in the shell, the shell is in an inverted J shape, a flowing cavity used for containing a heat conduction medium is formed in the shell in the length direction of the shell, the flowing cavity comprises a first vertical part and a first bent part which are matched with the shell in shape, the first vertical part is used for being tightly attached to the heating face of the loudspeaker magnetic cover, and the first vertical part is perpendicular to the horizontal plane when the earphone is worn. At least part of the first bent parts are used for penetrating through the earmuffs to extend outwards. And the heat-conducting medium is arranged in the flowing cavity and can form circulating flow in the flowing cavity through temperature change. The headset is compact and simple in structure, the headset is provided with an inner-outer circulating heat dissipation system, heat generated by the loudspeaker unit during working is conducted to the outside of the earmuffs, and the heating condition of the headset during wearing is relieved to a certain extent.

The invention discloses a hydraulically powered mine axial flow ventilation fan. The hydraulically powered mine axial flow ventilation fan comprises an outer shell and an impeller, and further comprises an inner cylinder body, a hydraulic motor, a motor supporting seat and an adapter shaft. A flow guiding cover is arranged at the air inlet end of the fan. The inner cylinder body is fixedly connected to the inner part of the outer shell by a web direction rib plate, one end of the motor supporting seat is fixed to the end part of the air inlet end of the inner cylinder body through a bolt assembly, and the hydraulic motor is fixed to the other end part of the motor supporting seat through a bolt assembly. The shaft extending end of the hydraulic motor extends into an inner hole of the motorsupporting seat and then is connected with the adapter shaft through a flat key or a spline. The adapter shaft is fixed into a bearing box, at the geometric center of the outer shell, of the inner cylinder body through more than two bearings, and the other end of the adapter shaft is connected with an impeller shaft hole through a flat key or a spline. The hydraulic motor is connected with an oilreturn pipe and an oil inlet pipe, and the oil return pipe and the oil inlet pipe are connected to a hydraulic station through a hydraulic control valve after penetrating through the outer shell. Thehydraulically powered mine axial flow ventilation fan has a compact structure, large torque, light weight, low noise, a long service life and convenient maintenance.

The present invention provides a heat conduction vacuum gauge based on a fluorescence method, and is used for measuring air pressure and vacuum degree in a vacuum chamber, the vacuum gauge comprises avacuum gauge housing (1), a fluorescent material (2) disposed within the vacuum gauge housing, and an optical probe (3), wherein the optical probe (3) is disposed spacing apart from the fluorescent material (2), wherein, in an operating state, the fluorescent material (2) is excited to emit fluorescence, the optical probe (3) receives the fluorescence and transmits to the transmitter (5) throughan optical fiber (4), and the transmitter (5) calculates the vacuum degree. The optical probe and the fluorescent material used in the vacuum gauge can have a very small geometric size, a small corresponding heat capacity, and high measurement responsivity, and are advantageous for miniaturization and integration. The vacuum gauge has the advantages of a simple structure, convenient use, accuratemeasurement and a high commercial value.

The invention discloses a hydraulic damping device for a direct-drive bicycle riding platform, and relates to the technical field of physical training instruments. The damping device for the direct drive type bicycle riding platform is composed of a liquid resistor used for generating damping, a mechanical transmission mechanism used for driving the liquid resistor and a cooling device used for heat dissipation of the liquid resistor, wherein a casing, an O-shaped sealing ring, a resistance wheel shaft, an impeller, a bearing seat, a built-in flywheel, a resin plate and a fastening ring form the liquid resistor used for generating damping, damping oil is injected into the casing, the O-shaped sealing ring is placed in a casing sealing groove, and the fastening ring is connected with the casing through a bolt. According to the invention, a hydraulic damping technology is adopted; the connection of power supply is not needed, the device is wide in application range and free of electromagnetic noise, a transmission component capable of generating damping is sealed in a sealed oil cavity, the casing has the smooth characteristics of noise isolation, more silence and hydraulic damping,and due to the inertia effect of an internally-arranged external flywheel and the built-in flywheel, the riding feeling is smoother.

This invention discloses an iron core magnet gap process technology of inductance ballasts, which welds dots of non-iron magnetic substance between two opposite core end faces around the gap and form alloy connections.