188 results about "Magnetic liquids" patented technology

The invention relates to the technical field of high-voltage commutation, and discloses a control method and system for a composite LC filter of a high-voltage converter station, and a storage medium. According to the method, on the basis of staggered solid / liquid-filled dielectric plates and series hollow inductors in a sealed oil tank, by obtaining a capacitance / inductance adjusting instruction, the filling and pumping volume and speed of insulating liquid and magnetic liquid are controlled according to the absolute value of an adjusting value, and continuous and accurate adjustment of the filtering frequency and reactive power is achieved. The method comprises multiple optimization: monitoring high fluctuation of liquid, synchronously filling, pumping and radiating, balancing efficiency and energy consumption according to an adjusting frequency adaptive circulation speed, and performing reverse linkage cooperative adjustment on a dielectric medium pump and a magnetic liquid pump; and magnetic liquid leakage and insulation abnormity are treated in stages, so that operation is guaranteed. The method solves a traditional adjustment dead zone, does not need a power electronic device, is low in cost, is small in loss, is adaptive to outdoors, and improves the electric energy quality and equipment safety of a converter station.

The invention relates to a pressure and temperature multifunctional sensor for energy collection and a manufacturing method thereof, the pressure and temperature multifunctional sensor adopts a double-layer composite structure: an upper wire coil layer is composed of a liquid metal coil embedded in a PDMS substrate, silver paint and a wire connected with the silver paint, and a lower magnetic fiber network layer is formed by weaving magnetic liquid crystal elastomer LCE composite fibers; the two are structurally integrated through a bonding layer; a coil conductive loop in the upper wire coil layer is formed on the surface of the PDMS substrate through a direct-writing printing technology, and packaging protection is completed through secondary pouring of PDMS; the LCE composite fiber takes an LCE hollow fiber tube as an external carrier, magnetorheological fluid is filled in the LCE composite fiber to serve as a magnetic medium, and two ends of the LCE composite fiber are sealed and packaged by adopting a compound of neodymium iron boron magnetic particles and PDMS (Polydimethylsiloxane). The sensor provided by the invention not only can realize pressure and temperature sensing, but also can be used as an energy collection device, provides a new solution for sustainable development of wearable equipment and sensors, and has a wide application prospect.

The invention discloses a multi-magnetic-source comb-shaped water tank magnetic liquid sealing device, and belongs to the field of mechanical engineering sealing. A first pole shoe, a second pole shoe, a third pole shoe and a fourth pole shoe which are provided with annular comb-shaped tooth grooves are alternately connected with a first permanent magnet, a second permanent magnet and a third permanent magnet in series, wherein the first permanent magnet, the second permanent magnet and the third permanent magnet are arranged in a manner that N-S-S-N-N-S magnetic sources are arranged in sequence or N-S-N-S-N-S-S-S-S-S magnetic sources are arranged in an inverted manner, and the multi-magnetic-source comb-shaped water tank sealing assembly is formed. Each pole shoe is provided with an annular cooling water tank, and spiral fins are machined on the bottom face and the side face of each cooling water tank, so that the effective heat exchange area in magnetic liquid sealing can be increased, convective heat transfer of cooling fluid is enhanced, the heat dissipation capacity is enhanced, the stable temperature of the magnetic liquid is kept, the sealing pressure resistance is improved, and the service life is prolonged. The installation mode that the multiple magnetic sources are sequentially arranged can compensate the weakening effect of the water tank on the magnetic field through magnetic field superposition, the magnetic field intensity difference value of the pole teeth is increased, and the sealing and pressure resisting capacity of the magnetic liquid is further enhanced.

The invention discloses a high-stability magnetic liquid and a preparation method thereof, and belongs to the field of magnetic fluid nano functional materials related to ships. The magnetic liquid comprises a metal-doped iron oxide nano-particle core, a double-layer surface modification layer composed of oleic acid and a silane coupling agent, and a composite carrier liquid formed by compounding poly-alpha olefin synthetic oil and perfluoropolyether and adding nano-diamond. The preparation method comprises the following steps: firstly, coprecipitating and calcining to obtain metal-doped iron oxide nanoparticles, then carrying out double-layer coating modification, and finally carrying out mixed ball milling, ultrasonic treatment and magnetic separation purification on the metal-doped iron oxide nanoparticles and the composite carrier liquid. The saturation magnetization intensity of the magnetic liquid reaches 92-95 emu / g, the magnetic liquid can work for a long time under the high-temperature working condition, the heat conductivity coefficient is increased by 2-3 times, and the redispersibility is excellent. The problems that a traditional magnetic fluid is low in magnetic performance, prone to failure at high temperature, poor in dispersion stability and the like are solved, and the magnetic fluid is suitable for aerospace, high-end manufacturing, ship propulsion and other extreme scenes.

The invention relates to the technical field of miniature medical robots, and discloses a magnetic liquid metal-based soft drug-loaded capsule robot, which comprises a soft capsule robot main body, a soft capsule robot cover and a degradable sealing sleeve, the soft capsule soft robot main body comprises a bottom fan-shaped magnetic liquid metal storage cabin, a left fan-shaped medicine storage cabin, a left rectangular medicine release port, a right fan-shaped medicine storage cabin and a right rectangular medicine release port. According to the soft drug-loaded capsule robot based on the magnetic liquid metal and the preparation and driving method of the soft drug-loaded capsule robot, a Helmholtz coil is used for generating a clockwise rotating composite magnetic field on a YZ plane, and anticlockwise rolling of a capsule is achieved through magnetic response of the magnetic liquid metal; the problem of limited energy supply of the micro-robot is solved through driving of an external magnetic field, and movement in any direction and accurate positioning are supported; the gelatin sealing sleeve is melted through external laser irradiation, and instant release of the medicine is achieved (suitable for emergency treatment).

The utility model discloses a magnetic field liquid pressure difference sealing performance-rheological property synchronous measurement system which comprises a rheometer main body, a sealing rotor structure, a pneumatic pressurizing device, a temperature control and measurement device and a computer measurement and control device, the pneumatic pressurizing device comprises a constant pressure pump and a gas storage bottle, and is connected with the sealing rotor structure through a vent hole in the shell; the temperature control and measurement device comprises a temperature controller and a temperature control execution module which is arranged on the side wall of an outer cylinder at one end, close to the magnetic liquid area, of the magnetic function unit; the computer measurement and control device is connected with the optical encoder, the pressure sensor, the temperature controller and the torque control type motor. The system can simulate and test the sealing effect and rheological property of the magnetic liquid in a static state and a dynamic state, explores the actual influence of the magnetic liquid on the sealing property when the magnetic liquid flows, and supports the rheological test under the condition of multi-field coupling of a flow field, a magnetic field and a temperature field.

The utility model discloses a novel side-mounted magnetic liquid level metering device, which relates to the technical field of liquid level metering devices and comprises a shell, a mounting mechanism is arranged on the shell, the shell is mounted on an external container through the mounting mechanism, a cavity is arranged in the shell, a liquid inlet pipe communicated with the cavity is fixed at the bottom of the shell, and a liquid outlet pipe communicated with the cavity is fixed at the bottom of the shell. According to the novel side-mounted magnetic liquid level metering device, after liquid level metering is completed, the end opening of the branch pipe is plugged through the sealing plug, the miniature air pump works and injects air into the cavity, the air pressure in the cavity rises, liquid in the cavity is pressed, the liquid in the cavity is separated from the branch pipe, the liquid in the cavity is separated from the branch pipe, and the liquid in the cavity is separated from the branch pipe. The liquid in the cavity flows back to the external container through the liquid inlet pipe under the action of air pressure, so that after measurement is completed, the liquid in the cavity can automatically flow back to the container to be measured, and the liquid is prevented from being wasted.

The present invention discloses a roller device and a belt conveyor. The roller device includes a rotating member, a mounting seat, a bearing, a sealing assembly, and a first permanent magnet. The bearing is provided with lubricating fluid and is disposed within a mounting cavity. One end of the rotating member extends through an opening and extends within the bearing. The sealing assembly includes a sealing unit and magnetic fluid. The sealing unit is disposed within the mounting seat and extends through the rotating member. The sealing unit is located on a side of the bearing adjacent to the opening, and the inner circumference of the sealing unit and the outer circumference of the rotating member are spaced apart in an inner-outer direction to form a first gap. The magnetic fluid fills the first gap. The first permanent magnet is disposed within the mounting cavity and located between the sealing assembly and the bearing. The first permanent magnet is connected to the sealing assembly. The first permanent magnet extends through the rotating member, and the inner circumference of the first permanent magnet and the outer circumference of the rotating member are spaced apart to form a second gap. The roller device of the present invention has the advantages of a simple structure and a long service life.

Provided is a device sealed with a magnetic liquid. The device includes: a rotary shaft, a tank body, a control unit, a first module, a second module, a magnetic liquid, and a pole-tooth. The first module and the second module are in the same configuration, each consists of an outer shell, a left pole-shoe, an electromagnet, a control wiring, a right pole-shoe, and a circlip. The device includes at least two modular structures; the control unit controls a first electromagnet and a second electromagnet to be magnetized to alternately bear a sealing role.

The self-supplemental magnetic liquid sealing device comprises a shell, a rotating shaft and at least one pole shoe. The rotating shaft is internally provided with at least one supplement groove for accommodating standby magnetic liquid. The rotating shaft is provided with an opening in communication with the supplement groove on the peripheral surface. The magnetic property of the multiple pole teeth of the pole shoe increases in a stepped manner in the direction away from the supplement groove. When the rotating shaft rotates, the magnetic liquid in the supplement groove flows out from the opening under the action of centrifugal force and is supplemented into the sealing gap of the multiple pole teeth under the attraction of the pole teeth. The device uses the magnetic field strength gradient to make the magnetic liquid fill the sealing gap. The magnetic liquid can be automatically supplemented or replaced without disassembling or opening the sealing device, thereby reducing the maintenance cost and downtime, effectively solving the problem of evaporation of the magnetic liquid, and improving the sealing reliability and service life of the magnetic liquid sealing device.

The magnetic liquid sealing device of the present application belongs to the field of mechanical engineering sealing. The device is composed of the following components: main shaft, magnetic liquid I, pole shoe ring I, shell, sealing ring I, pump I, container I, sealing ring II, electromagnet I, magnetic conducting sleeve, electromagnet II, pump II, container II, sealing ring III, pole shoe ring II, magnetic liquid II, sealing ring IV, end cover. The sealing device composed of these components is a module that can be used in stack. Two kinds of magnetic liquids are used alternately or simultaneously, which expands the applicable temperature range of the magnetic liquid sealing. The sealing device is modularized, and different types of magnetic liquids can be used in different modules to have different applicable temperature ranges. The magnetic liquid sealing can be used in a wide temperature range by connecting the modules in series. The electromagnet is used as the magnetic source, and according to different working temperatures, the state of each magnetic liquid sealing can be independently controlled through cooperation with the pump to prevent permanent failure of the magnetic liquid due to temperature problems.

The invention discloses a magnetic liquid sealing device capable of continuously supplementing magnetic liquid for an outer space, and relates to the technical field of sealing, the magnetic liquid sealing device comprises a rotating shaft, a shaft sleeve, a first pole shoe, a permanent magnet, a second pole shoe, a first oil seal and a second oil seal, the rotating shaft is sleeved with the shaft sleeve, and the first pole shoe, the permanent magnet and the second pole shoe are sequentially sleeved with the shaft sleeve; a first sealing gap and a second sealing gap are defined by the first pole shoe and the shaft sleeve and by the second pole shoe and the shaft sleeve respectively, the first oil seal and the second oil seal are arranged on the shaft sleeve corresponding to the first pole shoe and the second pole shoe respectively, and a liquid storage cavity used for storing magnetic liquid is formed between the first pole shoe and the second pole shoe. And the magnetic liquid in the liquid storage cavity is used for supplementing the first sealing gap and the second sealing gap. According to the magnetic liquid sealing device capable of continuously supplementing the magnetic liquid for the outer space, the oil storage structure is arranged, so that the sealing magnetic liquid is supplemented in time after being consumed, and the long-term reliability of magnetic liquid sealing under severe working conditions is guaranteed.

The invention provides a stiffness-adjustable acceleration sensor based on a magnetic liquid and a differential mutual inductance principle. The stiffness-adjustable acceleration sensor is used for solving the problems that an existing acceleration sensor is insufficient in sensitivity and fixed in equivalent stiffness, and measuring range and response are difficult to consider at the same time. The sensor takes a magnetic liquid suspended composite magnet working unit as a core, the working unit is composed of a middle iron core and permanent magnets on the two sides of the middle iron core, the whole working unit is immersed in magnetic liquid, stable suspension is achieved through second-order buoyancy of the magnetic liquid, and therefore mechanical friction is reduced, and the dynamic response performance is improved. A restoring force permanent magnet and an adjusting coil are arranged on the two sides of the sensor shell, and continuous adjustment of magnetic restoring force and equivalent stiffness is achieved by adjusting coil current. The first primary coil and the second primary coil are symmetrically arranged on the two axial sides of the iron core, the first secondary coil and the second secondary coil form a differential mutual inductance detection structure, displacement of the working unit causes mutual inductance change under the action of uniform acceleration, differential induction voltage is output, and high-sensitivity measurement of the uniform acceleration is achieved.

The utility model provides a kind of magnetic liquid coupling suspension mechanical pump with split end cap, it is characterized by, including: impeller assembly, end cap, shell and rotor assembly;The inner shell cavity is formed in the shell central area recess;The rotor assembly is installed in the inner shell cavity;The impeller assembly is connected with the rotor assembly;The end cap is including first split end cap and second split end cap formed along radial division, the first split end cap and the second split end cap are installed on the wheel shaft along radial direction.The utility model uses split end cap structure, so that it can realize the integrated forming of impeller assembly and rotor assembly, the structure avoids the structural interference problem caused by traditional end cap needing to be inserted from shaft end, so that impeller and rotor can be integrally inserted into shell interior for assembly, significantly reduce assembly complexity and requirement to machining precision.

The utility model discloses a pressure-resistant explosion-proof magnetic liquid level meter, which relates to the technical field of magnetic liquid level meters and comprises a clamping frame, a first measuring tube and a second measuring tube are respectively connected inside the clamping frame, an anti-overflow shell is connected to the top of the first measuring tube and the top of the second measuring tube, and a baffle tube is fixed below the inside of the anti-overflow shell. A pulley is connected to the upper portion in the anti-overflow shell, a high-temperature-resistant pull rope is connected to the top of the pulley, one end of the high-temperature-resistant pull rope is connected with a first hanging shell, a strong magnet is installed in the first hanging shell, and the other end of the high-temperature-resistant pull rope is connected with a second hanging shell. Through the arrangement of the first measuring tube, the second measuring tube, the first hanging shell, the strong magnet, the pulley, the high-temperature-resistant pull rope, the second hanging shell, the cavity and the balancing weight, a medium flows through the first measuring tube, and the second measuring tube measures the liquid level in a linkage mode, so that the strong magnet is separated from the high-temperature medium; the liquid level can be measured, and demagnetization of the strong magnet caused by high temperature is avoided; the use in a high-temperature environment is convenient.

This invention belongs to the field of oil and gas well exploration and development technology, specifically relating to a high-temperature sealing thread grease for oil casing and its preparation method and application. The thread grease comprises the following components in parts by weight: 33-58 parts base grease, 10-40 parts magnetic fluid, 1-5 parts polyethylene glycol, 5-10 parts phosphate ester, 4-10 parts fumed silica, 3-18 parts graphite, 1-5 parts nano-molybdenum powder, 1-5 parts nano-copper powder, 6-12 parts zinc powder, 10-30 parts lead powder, 5-10 parts alkylphenol resin, 5-15 parts acrylic resin, 5-15 parts polytetrafluoroethylene, 10-18 parts diisocyanate, 10-18 parts polyurethane, 10-12 parts tetraethylene glycol dimethacrylate, and 6-11 parts nitrile rubber. This invention ensures good lubricity while maintaining excellent sealing performance under high-temperature conditions.

The utility model discloses a self-cleaning type magnetic liquid level meter, which comprises two groups of external pipes, two groups of magnetic liquid level meters, two groups of magnetic liquid level meters and two groups of magnetic liquid level meters, the input end of the branch pipe is connected with a blow-off pipe of the liquid level meter, and two groups of output pipes of the branch pipe are respectively provided with an electromagnetic valve; the number of the switch electromagnetic valves is two, and the two switch electromagnetic valves are connected with the two connecting pipes of the liquid level meter respectively. The cleaning fluid tank comprises two groups of tank bodies, the two groups of external connection pipes are respectively connected with the output ends of the two groups of tank bodies, and pump machines are arranged between the external connection pipes and the tank bodies. According to the self-cleaning type magnetic liquid level meter, automatic operation of cleaning of the liquid level meter can be achieved. The manual operation of each valve and equipment is not needed, so that the labor cost is saved, the cleaning efficiency is improved, and meanwhile, the problems of poor cleaning effect and the like possibly caused by untimely or inaccurate manual operation are also reduced.

The application belongs to the technical field of buffering, and proposes a magnetorheological buffering structure for heavy load impact, which comprises a cylinder body, a piston body, a magnetic liquid filled between the cylinder body and the piston body, two axial magnetization permanent magnets respectively arranged on the piston body and the cylinder body, and a radial magnetization permanent magnet. The axial magnetization permanent magnet arranged on the piston body moves towards or away from the other axial magnetization permanent magnet through the piston body, and the opposite surfaces of the two axial magnetization permanent magnets repel each other. The radial magnetization permanent magnet and the inner wall of the cylinder body form a damping flow channel, and the magnetic liquid flows in the damping flow channel during the relative movement of the piston body relative to the cylinder body. The application can output a large enough damping force, the buffering process is stable, the comprehensive anti-impact performance of the existing buffering technology can be improved, and the buffering requirement under high-speed heavy load impact can be met.

The application discloses an ionic liquid-based magnetic liquid and a preparation method thereof. The ionic liquid-based magnetic liquid comprises a magnetic mesoporous material, a functionalized ionic liquid and a base carrier liquid. The cation of the functionalized ionic liquid is R1R2R3R4N + , wherein R1 is C8-C 20 alkylcarboxylic acid group, R2 is C1-C8 alkyl, R3 is C1-C8 alkyl, and R4 is C1-C8 alkyl. The anion of the functionalized ionic liquid is any one of F ‑ , Cl ‑ , Br ‑ , and I ‑ . The application further provides the preparation method of the ionic liquid-based magnetic liquid. The ionic liquid-based magnetic liquid has good stability, is not easy to volatilize, is not flammable, can be applied to a wide temperature range, and the preparation method is simple and has low requirements on equipment.

The invention discloses a pile forming device based on magnetic fluid drainage and cement extrusion, which comprises a pile casing made of high-strength carbon steel, and the inner wall of the pile casing is pre-coated with a sulphoaluminate expanding agent layer; the guide pipe is connected with the pile casing and used for pouring cement paste; a magnetic liquid discharging and cement extruding integrated device integrates a magnetic field generator, a magnetic liquid storage chamber, a mixed liquid storage chamber, a cyclone separator and a sprayer. The magnetic field generator is located at the bottom of the device and vertically and downwards generates a 0.5-1.5 T magnetic field to drive the magnetic liquid to be separated from the cement mixed liquid; a filtering opening is formed in the outer side of the protective cylinder, is connected with the two-stage cyclone separator and is used for separating magnetic particles and recovering magnetic liquid. The directional drainage channel is constructed through the magnetic liquid layer, magnetic field induction and a multi-stage pressurization technology are combined, the drainage efficiency and the pile body compactness are remarkably improved, meanwhile, controllable expansion of the pile diameter is achieved through the pile casing expanding agent layer, and the pile foundation bearing capacity is enhanced.

The application discloses a kind of magnetic liquid double-suspension mixed-flow blood pump, comprising: pump shell, impeller, for driving impeller rotation drive motor, front magnetic bearing and rear magnetic bearing, pump shell is provided with pump outer tube, coaxially nested in pump inner tube in pump outer tube and is communicated in the pump cavity of pump inner tube lower end;Impeller includes the screw rod type impeller of front section and the vertical sheet type impeller of rear section, screw rod type impeller is coaxially arranged in pump inner tube, and vertical sheet type impeller is arranged in pump cavity;Vertical sheet type impeller has multiple vertical blades in radial, and the upper and lower end surfaces of multiple vertical blades are all provided with inclined surface, and two inclined surfaces on each vertical blade and the upper and lower two sides of the inner wall of pump cavity are all formed with wedge-shaped hydrodynamic pressure structure with big upcurrent port and small backflow port.The application magnetic liquid double-suspension mixed-flow blood pump adopts double-suspension mechanism of magnetic suspension and hydraulic suspension, can improve the stability and reliability of blood pump, and also greatly improves the work efficiency.

The present application relates to the technical field of mechanical engineering sealing, and is suitable for sealing in ultra-high vacuum environment. The present application is an ultra-high vacuum magnetic liquid sealing device, belonging to the field of mechanical engineering sealing. The device is composed of a shell, a rotating shaft, a first sleeve, and a two-stage magnetic liquid sealing structure. The device does not have a rubber O-ring. The sealing assembly is arranged between the ultra-high vacuum side and all the bearings. The left side of the shell is non-magnetic, and the right side is magnetic, and the two parts are welded together. The left side of the rotating shaft is magnetic, and the right side is non-magnetic, and the two parts are welded together. The first pole shoe is connected with the shell and integrated by welding. The second pole shoe is connected with the shell and has no pole teeth, and there is a small gap between the second pole shoe and the rotating shaft. The third pole shoe is connected with the rotating shaft and has no pole teeth, and there is a small gap between the third pole shoe and the shell. The second pole shoe and the third pole shoe only have a magnetic guiding function. The fourth pole shoe is connected with the rotating shaft and integrated by welding. The present application has the advantages of reliable sealing, high ultimate vacuum degree, low leakage rate, low gas permeability, and no vacuum pollution.

The present application relates to a self-sensing magnetic liquid damping vibration absorber and a preparation method thereof. The self-sensing magnetic liquid damping vibration absorber is used to be installed on the structure to be damped. The self-sensing magnetic liquid damping vibration absorber includes: a shell, an insulating tube, two high charge density parts, two conductive parts, a permanent magnet, and an ammeter. The self-sensing magnetic liquid damping vibration absorber combines power generation indication with vibration reduction based on dynamic double electric layer power generation technology and the second-order buoyancy principle of magnetic liquid, thereby realizing vibration monitoring and vibration reduction at the same time, and is not affected by other environmental factors. It only indicates and reduces vibration, achieving the effect of stable vibration monitoring and vibration reduction.

The application discloses an ultra-high molecular weight polyethylene non-woven fabric modified based on liquid metal and MXene and a preparation method thereof, and belongs to the technical field of protective functional textile composite materials. After the ultra-high molecular weight polyethylene non-woven fabric is pretreated through hydrophilic modification, a composite coating material composed of magnetic liquid metal formed by iron powder and liquid metal gallium and MXene is sprayed, then the liquid metal is spread between fibers and bridges MXene and iron powder through rolling treatment, a continuous conductive / magnetic double network is formed, a packaging layer is coated at last, and the ultra-high molecular weight polyethylene non-woven fabric modified based on liquid metal and MXene is obtained. The finishing process of spraying combined with rolling is simple, low in cost and easy to be industrialized; the prepared ultra-high molecular weight polyethylene non-woven fabric modified based on liquid metal and MXene has an electromagnetic shielding efficiency greater than 35 dB in the X wave band, meanwhile, excellent characteristics such as flexibility and wear resistance are maintained, and the unification of light weight and high performance is realized.

The present invention relates to a magnetically driven flexible circulation heat dissipation system and heat dissipation device, comprising a fluid pipeline for introducing a liquid metal fluid working medium, a plurality of metal coils, and an electromagnetic pump. The plurality of metal coils are spaced apart and sleeved on the fluid pipeline, and the electromagnetic pump is mounted on the fluid pipeline. The liquid metal fluid working medium comprises liquid metal or liquid alloy with added magnetic particles. The present invention utilizes the force exerted by a current-carrying conductor in a magnetic field to drive the liquid metal to circulate for heat dissipation. The electromagnetic drive pump is combined with a multi-stage coil drive method to drive the magnetic liquid metal working medium to circulate for heat dissipation, thereby achieving stronger circulation drive capability. Furthermore, the system lacks the rotating parts of traditional pumps, resulting in high reliability. Furthermore, the thermal conductivity of liquid metal is much higher than that of liquid water, significantly improving the system's heat transfer capacity and heat dissipation effect.

The application relates to a long-service-life anti-nuclear-radiation dustproof magnetic liquid sealing device, and belongs to the technical field of mechanical engineering sealing. The device comprises a shell assembly, a threaded end cover, a clamping hoop assembly, a magnetic guide sleeve assembly, magnetic liquid, four permanent magnets, four magnetic shielding rings, a right bearing, a right pole shoe assembly, a middle pole shoe assembly, a left pole shoe assembly, a left bearing and a syringe. The magnetic liquid is injected between the permanent magnet I, the permanent magnet IV and the shell to form a magnetic liquid static seal, and the magnetic liquid is injected between the permanent magnet I and the permanent magnet IV and the magnetic guide sleeve to form a magnetic liquid dynamic seal, so that the right bearing and the left bearing are prevented from being blocked due to the entry of radioactive powder, and the stable operation of the device is ensured; when the original magnetic liquid is consumed, the locking screw on the shell is taken out, the magnetic liquid is injected into the opened magnetic liquid supplement injection channel through the syringe, under the action of the magnetic field, the injected magnetic liquid re-forms the magnetic liquid seal, the complexity of the maintenance operation is reduced, and the pressure resistance of the device is ensured.

The present invention relates to the field of material technology, and particularly relates to a nuclear radiation-resistant magnetic particle, a preparation method thereof, and a nuclear radiation-resistant magnetic liquid. The nuclear radiation-resistant magnetic particle comprises: a nano magnetic particle, wherein the surface of the nano magnetic particle is coated with a mesoporous silica layer, and barium sulfate is loaded on the mesoporous silica layer. In the present invention, a mesoporous silica layer is coated on the surface of the nano magnetic particle and barium sulfate is loaded by a surface in-situ synthesis method, so that the prepared magnetic particle and magnetic liquid have good nuclear radiation resistance.

The invention provides an axial magnetic liquid suspension mechanical pump which comprises an impeller assembly, a rotor cavity and a rotor assembly. A core shaft is mounted in the rotor cavity; the rotor assembly is installed in the rotor cavity, axial gaps exist between the upper end face and the lower end face of the rotor assembly and adjacent parts, and the sum of the gaps is larger than or equal to 10 micrometers. A wheel shaft of the impeller assembly is fixedly connected with the rotor assembly and rotationally connected with the mandrel. The axial suspension structure and characteristics of the liquid magnetic suspension mechanical pump are reserved, the design of the central spindle provides a stable rotation center for the rotor assembly, a radial low-abrasion supporting mode is achieved, and on the basis that the advantages of the liquid magnetic suspension pump are kept, the operation stability of the pump is further improved, the service life of the pump is further prolonged, and the overall performance of the pump is further improved.

The invention discloses a low-leakage-rate magnetic powder sealing device and an injection method.The low-leakage-rate magnetic powder sealing device comprises a shell, a rotating shaft, a magnetic sealing assembly and a sealing medium, and the shell is provided with an inner cavity; the rotating shaft is rotatably arranged in an inner cavity of the shell; the magnetic sealing assembly is arranged in the inner cavity, the magnetic sealing assembly comprises a pole shoe and a magnetic source which are connected, the outer edge of the pole shoe abuts against the inner wall of the shell for sealing, the inner edge of the pole shoe is provided with a plurality of pole teeth, and a plurality of annular sealing gaps are defined between the pole teeth and the rotating shaft; the sealing medium comprises magnetic powder and magnetic liquid, and the sealing gaps are filled with the magnetic powder and the magnetic liquid so that a mixed sealing ring can be formed in each sealing gap. According to the embodiment of the invention, the leakage rate of the sealing device is greatly reduced and the sealing friction torque is reduced while the high sealing pressure resistance is maintained, so that the magnetic powder sealing technology can be ensured to be applied to occasions with higher requirements on the leakage rate.