35results about How to "Reduce the influence of magnetic field" patented technology

The invention provides an experimental device for forming a hydrate in a combined multi-phase fluid pipeline, and belongs to the field of hydrate flowing safety. The device is characterized in that a liquid phase is arranged in a reaction kettle, and a gas is injected into the reaction kettle by boosting of a gas booster pump; a window on the cylinder body of the reaction kettle can be used for observing the forming condition of hydrate in the reaction kettle; a cooling liquid with which a jacket outside the reaction kettle is filled is used for controlling temperature of the reaction kettle, and temperature and circulation of the cooling liquid is controlled by a temperature-control water bath; and temperature and pressure signals in the hydrate forming process are collected by a data collection system. Two methods are provided for using the device, according to the first using method, the reaction kettle is used as a shaking kettle, the reaction kettle on a shaking rack is driven by a motor in a power shaking system, the center of the kettle body is used as a fulcrum, and two ends of the reaction kettle swing up and down, so that gaseous and liquid phases in the reaction kettle are driven to be mutually mixed; and according to the second using method, the reaction kettle is used as a stirring kettle, a magneton in the reaction kettle is driven to rotate by an external magnetic field which is provided by a magnetic stirrer in a magnetic stirring system, and gaseous and liquid phases in the reaction kettle are stirred.

The invention discloses a parallel IGBT power unit. The parallel IGBT power unit comprises an upper bridge IGBT module and a lower bridge IGBT module. Each IGBT module includes at least two IGBT modules which are connected in parallel, and further comprises an upper busbar and a lower busbar which are correspondingly connected with the two IGBT modules. The upper busbar is provided with a first leading-out terminal for connecting with a first main busbar and a first capacitor connecting terminal for connecting with a capacitor. The lower busbar is provided with a second leading-out terminal for connecting with a second main busbar and a second capacitor connecting terminal for connecting with a capacitor. According to the parallel IGBT power unit, the two IGBT modules and the two busbars which have identical structures and are correspondingly connected with the modules respectively are adopted; the leading-out terminals for connecting with the main busbars and the capacitor connecting terminals for connecting with the capacitors on the busbars are in conductive connection with docking connecting terminals and capacitor connecting terminals at corresponding positions of the IGBT modules of corresponding busbars by using copper bars in identical lengths; and since busbars connecting the IGBTs are identical in length, the current-sharing performance of the parallel IGBT modules on the busbars is guaranteed, and a problem of uneven current during parallel connection of the IGBTs is solved.

The invention discloses a polymer solution-based magnetofluid self-assembly needle-free electro-spinning device which comprises a groove. The device further comprises a controllable magnetic field generation module, a high-voltage electric field generation device, a conductive fiber receiving device used for collecting cellosilk, and at least one conductive and magnetic conductive cone tower. The surface of the cone tower is provided with a threaded groove ascending spirally along the cone tower. The polymer solution-based magnetofluid self-assembly needle-free electro-spinning device is simple in structure, operation is controllable and easy to control, and processing efficiency is high. Meanwhile, the invention further provides a nanofiber electro-spinning method achieved through the needle-free electro-spinning device. According to the method, the aim of controlling jetting of polymer solution-based magnetofluid is achieved by controlling electric and magnetic fields. The method is controllable, easy to control and good in control accuracy.

According to an embodiment, an electronic device may include: a foldable housing including: a hinge; a first housing connected to the hinge and including a first face facing a first direction and a second face facing a second direction opposite the first direction; and a second housing connected to the hinge and including a third face facing a third direction and a fourth face facing a fourth direction opposite the third direction, the second housing configured to be folded relative to the first housing about the hinge, wherein, in a folded state, the first face faces the third face, and, in an unfolded state, the third direction is the same as the first direction; a display including a first portion and a second portion extending from the first face to the third face to form the first face and the third face, respectively; a digitizer including a third portion disposed between the first portion of the display and the second face and a fourth portion disposed between the second portion of the display and the fourth face; a first magnet disposed in the first housing to overlap the third portion of the digitizer when viewed from above the second face; a second magnet disposed in the second housing to overlap the fourth portion of the digitizer when viewed from above the fourth face and to face the first magnet in the folded state; a first magnetic shield fixed to the hinge and at least partially disposed in the first housing, the first magnetic shield configured to be movable relative to the first magnet wherein, when viewed from above the second face, the first magnetic shield member does not overlap the first magnet in the folded state and overlaps the first magnet in the unfolded state; and a second magnetic shield fixed to the hinge and at least partially disposed in the second housing, the second magnetic shield configured to be movable relative to the second magnet wherein, when viewed from above the second face, the second magnetic shield member does not overlap the second magnet in the folded state and overlaps the second magnet in the unfolded state.

The invention relates to a driving integrated magnetic adsorption wheel type device. The driving integrated magnetic adsorption wheel type device is characterized by comprising a transmission shaft, a harmonic reducer, a wheel body rubber coating shell, a motor, a transmission support, a belt wheel shaft, a magnet and a wheel body end cover, wherein the wheel body rubber coating shell and the wheel body end cover are matched to form a closed space, the transmission shaft is installed on the center axis of the wheel body rubber coating shell, one end of the transmission shaft extends out of the wheel body rubber coating shell and the wheel body end cover and is connected with a car body, and the other end of the transmission shaft is connected with a rigid wheel through a flange plate; the motor and the magnet are arranged at the position, located at the two sides of the harmonic reducer, in the space of the wheel body rubber coating shell, one side of the magnet is fixed to a first copper sleeve through a second magnetic support, and the other side of the magnet is fixed to the transmission shaft through a first magnetic support; one end of the motor is fixed to the transmission shaft through the transmission support, the belt wheel shaft is fixed to the portion, between the transmission shaft and the motor, of the transmission support, an output shaft of the motor, the belt wheel shaft and the transmission shaft are parallel and transmit power in the mode of a synchronous belt.

The invention provides electronic equipment. The electronic equipment comprises an antenna and a metal structure which are accommodated in a shell; in a first direction, the metal structure, at least part of the antenna and part of the shell are arranged in sequence; the metal structure is provided with a non-closed slot, and the slot penetrates through the metal structure in the first direction; the metal structure comprises a first surface directly facing the antenna in the first direction, the vertical projection of the antenna on the first surface is an antenna projection area, and the slot extends from the edge of the first surface to the interior of the first surface and passes through the antenna projection area, thus, when the antenna is in a working state, induced current in the same direction as current on the antenna is formed on the first surface. By using the electronic equipment provided by the invention, due to the existence of the non-closed slot on the metal structure, the adverse effect of the induced current on the magnetic field of the antenna is reduced, and the working performance of the antenna is effectively improved.

The invention provides a nano precipitate image acquisition method based on a scanning electron microscope back scattering mode. The nano precipitate image acquisition method comprises the following steps of sample pretreatment, electrolytic double-spray thinning, low-temperature erosion and scanning electron microscope shooting, so as to obtain a nano precipitate morphology image. According to the nano precipitate image acquisition method, the thickness of the sample is reduced, the purposes of improving the conductivity of the sample and reducing the magnetic influence are achieved, so thatthe imaging quality of the nano precipitate image in the steel material under the scanning electron microscope is improved; and compared with a traditional sample preparation and shooting method, a clearer image with a higher multiple can be obtained by adopting the nano precipitate image acquisition method, and the nano precipitate image acquisition method has certain significance in precipitatemorphology observation and size and distribution statistics.

The invention discloses a motor and a household electrical appliance. The motor comprises a rotor assembly and a magnetic induction part, wherein the rotor assembly comprises a rotor iron core and a rotating shaft connected with the rotor iron core, the rotor iron core is provided with a rotor end ring along the axial end part of the rotating shaft, and a groove is formed in the surface of the rotor end ring; a magnet is arranged in the groove, and the magnetic induction part has an induction surface for detecting the change of a magnetic field, so that the axial space of the motor can be saved, and the output power and the loading capacity of the motor can be improved; and the induction surface of the magnetic induction part faces the magnet and is perpendicular to the axial direction of the rotating shaft, so that the induction surface detects the magnetic field of the magnet in the axial direction, the influence of the magnetic field of the motor on the magnetic field of the magnet is reduced, the interference of the magnetic field of the motor is effectively reduced, the induction surface can accurately detect the magnetic field change of the magnet, and the motor can adjust the rotating speed more accurately.

The invention relates to a working table of a computer numerical control machine tool. The working table comprises a working table body and a cleaning mechanism. The cleaning mechanism comprises a cleaning baffle and a cleaning assembly. The cleaning assembly comprises an electromagnetic assembly, a linear reciprocating drive mechanism and a recovery groove with an opening formed in the top. The electromagnetic assembly comprises an electromagnet, a power supply, a control switch and a controller, wherein the electromagnet, the power supply and the control switch are sequentially connected in series and form a circuit. The controller controls on-off of the electromagnet through the control switch, and the electromagnet can do reciprocating motion between a scrap discharging opening and the position over the opening of the recovery groove by controlling displacement of the electromagnet through the linear reciprocating drive mechanism. Therefore, the moving space of metal powder scraps generated when a tool machining mechanism on the working table of the computer numerical control machine tool machines workpieces is limited, the metal powder scraps are stably centralized at one position of the working table and are prevented from flying around, cleanliness of the working table is guaranteed, and the work burdens and cleaning difficulty of cleaning personnel are reduced.

The invention relates to the technical field of baby series bamboo and wood products and discloses an adjustable automatic bamboo cradle based on a connecting rod transmission principle. The cradle comprises a base, and the top of the base is fixedly connected with a supporting rod. A lifting gear is movably connected to the interior of the supporting rod; the interior of the lifting gear is fixedly connected with a rotating rod; the outer portion of the lifting gear is in engaged connection with a fixing frame. A pawl is movably connected to the outer part of the fixed frame; the outer part of the pawl is movably connected with a limiting block; a limiting spring is fixedly connected to the outer part of the limiting block; a motor is fixedly connected to the interior of the fixed frame;through cooperative use of the supporting rod, the lifting gear, the rotating rod, the fixing frame, the pawl, the limiting block and the limiting spring, the effect of controlling the height of the cradle is achieved, the requirements of parents with different heights for the cradle with different heights are met, the applicability of the cradle is improved, and the using effect of the cradle isimproved.

The invention provides an electric energy meter, a circuit board wiring structure and a wiring method, and relates to the technical field of circuit board design. The electric energy meter is used for metering electric energy consumed by load equipment, and comprises an interface, a sampling circuit, a transmission line and a chip package which are arranged on a circuit board. The interface is used for connecting the load equipment and comprises a positive interface and a negative interface; the positive interface and the negative interface are sequentially connected with the sampling circuit and the chip package through the transmission line; the chip package is used for metering electric energy; and the transmission lines are arranged on the circuit board in a crossed mode at least once. According to the scheme provided by the invention, the influence of a changing magnetic field on the electric energy meter is reduced, and the accuracy of the electric energy meter during electric energy metering is improved.

A cathode ray tube comprising a panel of which an outer surface is substantially flat; a shadow mask installed with a certain interval from an inner surface of the panel, having a plurality of apertures through which electron beams pass, and formed as a pin-cushion shape in which long and short sides of the shadow mask are inwardly concaved; and the mask frame for fixing and supporting the shadow mask, wherein long and short sides of the mask frame are slanted from ends toward centers thereof in order to maintain a predetermined interval with the long and short sides of the shadow mask. According to this, a strength of the shadow mask is increased and an influence of a magnetic field is reduced thus to obtain an optimum quality.

The invention relates to a ripple suppression inductor and a direct-current power supply circuit. The inductor comprises a conducting circuit, a magnetic part and a compensation coil, the head end andthe tail end of the magnetic part are connected to form an annular structure with an opening in an enclosing mode, the conducting circuit penetrates through the opening, the compensation coil is arranged around the magnetic part, the conducting circuit is used for transmitting direct currents, and the compensation coil is used for connecting compensation currents. According to the ripple suppression inductor and the direct-current power supply circuit, a magnetic field generated after the compensation current passes through the compensation coil is counteracted with a magnetic field generatedby the current in the conducting circuit in the magnetic part; the influence of direct current in the conducting circuit on the magnetic field of the magnetic part is reduced; in this way, the current passing through the magnetic part is only ripple current, due to the fact that the ripple current amplitude is small and is the alternating current with the polarity changing positively and negatively, the magnetic conductivity of the magnetic part can be prevented from being reduced due to magnetic bias, the ripple suppression inductor has the large inductance value, the ripple current suppression effect of the ripple suppression inductor is improved, and the use reliability is improved.

The invention discloses a built-in precise centering device of a gyroscope. The built-in precise centering device comprises a shell, a through hole, a suspension body, a buffer pad, a jewel bearing, an electromagnet, a magnet and a magnetic shielding cover; The through hole is formed in the center of the shell, the suspension body is installed in the through hole, and the buffer pad is arranged between the through hole and the suspension body. The jewel bearing is mounted in the suspension body; the magnet is arranged in the suspension body and is mounted on the lower surface of a bulge on the outer side of the top end of the suspension body; the electromagnet is arranged in the shell, the electromagnet is arranged in the shell below the external expansion groove at the top end of the through hole, the electromagnet is opposite to the magnet on the suspension body, and the magnet is matched with the electromagnet. The built-in precise centering device has the characteristics that rigid contact and abrasion are avoided, the centering control circuit detects and adjusts magnetic suspension centering, and magnetic field interference on the gyroscope is reduced.

A magnetic shoe structure of a direct-current micromotor comprises a magnetic shoe body, wherein an inner cambered surface and an outer cambered surface of the magnetic shoe body are concentric; and two R corners are respectively arranged at two ends of the outer cambered surface. The magnetic shoe structure of the direct-current micromotor is characterized in that two flat sections are oppositely arranged on the outer cambered surface inwards along the inner ends of the two R corners, and are symmetrical to each other; and a gap is formed between each flat section and an lengthened surface of an arc-shaped surface in the middle of the outer cambered surface. The vertical distance L between the outer end of each flat section and the arc-shaped lengthened surface of the outer cambered surface is 7%-8% of a distance L1 between the outer cambered surface and the inner cambered surface. The arc length l1 of the arc-shaped surface in the middle of the outer cambered surface is 75%-78% of the whole arc length of the outer cambered surface. By the magnetic shoe structure, the increasing degree of current of the micromotor is reduced under the condition that the load speed of the micromotor is greatly increased, and moreover, noise can be reduced.