40 results about "Ferromagnetic particle" patented technology

The invention discloses a water-rich broken surrounding rock directional grouting method based on an external magnetic field. The method comprises the following steps that 1, geological exploration is conducted on a target water-rich broken surrounding rock area; step 2, mixing the base material, the nano ferroferric oxide magnetic particles, the rheology regulating agent, the dispersing agent and the coagulation accelerator according to a mass ratio; 3, injecting alternating current with the frequency of 50-500Hz into the electromagnetic coil to generate a rotating magnetic field with the intensity of 3-10kA / m, and driving the slurry to directionally migrate along the main fracture area; 4, the grouting pressure of the pre-buried pressure sensor is monitored in real time, when the pressure change rate delta P / delta t is larger than or equal to 0.1 MPa / min, the electromagnetic coil injection frequency is switched to alternating current of 1 kHz to 10 kHz, so that the intensity of a magnetic field is improved to 8 kA / m to 15 kA / m, and grouting on the micro-crack area is enhanced; and 5, when the pressure change rate delta P / delta t is smaller than + / -0.1 MPa / min and lasts for 5-10 min, grouting operation is ended. The method aims at solving the problems that in grouting reinforcement of the water-rich fractured stratum, slurry is lost along with water flow, micro-cracks are difficult to fill, and reinforcement bodies are distributed unevenly.

A pressure sensing conductive elastomeric composite material, the material comprising a polymer matrix, itself comprising an elastomeric material, and a conduction network within the polymer matrix. The conduction network comprises: a plurality of particle chains, with each particle chain comprising a plurality of metallic ferromagnetic particles, a plurality of liquid metal droplets, and a plurality of non-ferromagnetic conductive platelets, wherein the conductivity of the composite material varies as a function of the pressure applied to the material.

An apparatus and a polishing system for rotational magnetorheological abrasive flow nano-finishing are described. The apparatus includes an upper cylinder with coupled upper piston and a lower cylinder with coupled lower piston. A first motor drives synchronized reciprocating motion of both pistons via respective slider crank mechanisms. A magnet fixture positioned between the cylinders includes permanent magnets arranged in a ring configuration with a central hole for workpiece placement. A second motor rotates the magnet fixture to manipulate magnetic field orientation. The cylinders, pistons and magnet fixture define a space for containing magnetorheological (MR) fluid including ferromagnetic particles, abrasive particles and carrier fluid. The configuration enables controlled fluid flow through the hole while maintaining direct workpiece contact, with ferromagnetic particles exhibiting both rotational and reciprocal movement patterns. This dual-motion finishing approach enables material removal through magnetic field-controlled abrasive action, achieving nano-scale surface quality on complex geometries.

The invention belongs to the technical field of microbial protection and functional metal coating preparation, and particularly relates to a preparation method of a metal-based graphene oxide and zirconium oxide composite antibacterial coating on a flexible metal foil through magnetic field assisted jet electrodeposition. According to the method, a metal ion electroplating solution containing graphene oxide and zirconium oxide serves as a raw material on a flexible metal substrate, ferromagnetic particles are introduced to serve as a carrier, one-time forming is carried out under the action of a magnetic field through the scanning jet electrodeposition technology, and efficient fixing and uniform distribution of graphene oxide and zirconium oxide in a metal coating are achieved. The prepared coating is compact in structure and high in binding force, after the coating is in contact culture with escherichia coli and staphylococcus aureus for half an hour, the antibacterial rate reaches 94% or above, the antibacterial rate reaches 97% or above, and the coating has excellent stability and reliability. The method disclosed by the invention is simple and convenient in process and high in adaptability, can form a high-performance antibacterial coating on a flexible substrate, is suitable for the antifouling and anticorrosion fields of public health facilities, marine protection and engineering equipment, and has a wide industrial application prospect.

The utility model discloses an aviation lubricating oil supply device, and belongs to the technical field of lubricating oil supply. An aviation lubricating oil supply device comprises a filter box and further comprises a mounting plate detachably arranged on the filter box, outer pipes distributed in an array mode are detachably arranged at the bottom of the mounting plate, a connecting plate is detachably arranged at the top of the mounting plate, a positioning column is arranged in the connecting plate, and a strong magnet of a rotary body columnar structure is fixedly arranged at the bottom of the positioning column. The outer wall of the strong magnet abuts against the inner wall of the outer pipe. The outer pipe made of the non-magnetic material is arranged on the mounting plate, the strong magnet is arranged in the outer pipe, ferromagnetic particles in lubricating oil can be adsorbed on the outer pipe, during cleaning, after the mounting plate is detached from the filter box, the strong magnet is pulled out of the outer pipe through the connecting plate, at the moment, the outer pipe loses magnetism, and the ferromagnetic particles in the lubricating oil can be cleaned. Under cleaning of water flow or wind power, ferromagnetic particles on the outer wall of the outer pipe can be quickly cleaned, and the using effect is improved.

A power inductor includes a coil and an induced magnetic element. The coil includes two outer loop circuit layers and a plurality of insulation spacing layer. The outer loop circuit layers are stacked up and electrically connected to each other. The outer loop circuit layers have an outer connection end apiece. At least one insulation spacing layer is located between the outer loop circuit layers. The induced magnetic element encapsulates the coil and exposes the outer connection end of each of the outer loop circuit layers. The induced magnetic element includes a plurality of ferromagnetic particles. The ferromagnetic particles include an iron-based alloy particle and an insulation film covering the iron-based alloy particle apiece.

The application discloses a magnetic accessory replaceable particle medium limb rehabilitation training device and belongs to the field of rehabilitation training instruments. The device solves the problems of single resistance direction, complicated adjustment, lack of quantitative feedback and secondary injury of existing hand and ankle training devices. The device comprises a container, the container is filled with ferromagnetic particles, the outer side wall and the bottom are provided with magnetic accessories with different magnetic force gears which can be replaced, the inner side wall and the bottom surface are provided with a pressure sensing module and are in communication connection with a data display transmission module. The device adjusts the particle resistance through the magnetic accessories, provides full-directional diffuse resistance, realizes passive fast multi-stage resistance adjustment, simultaneously collects pressure distribution data in real time, identifies abnormal force mode and gives an early warning, can quantitatively evaluate the training effect and covers hand and ankle rehabilitation training.

The utility model discloses a stainless steel explosion-proof magnetic drive pump which comprises a driving motor, the side edge of the driving motor is connected with a supporting frame through a bolt, one side of the supporting frame is fixedly connected with a pump body through a bolt, the side edge of the pump body is fixedly connected with a flow guiding device through a bolt, and the interior of the flow guiding device is fixedly connected with a filtering assembly through a bolt. According to the scheme, the impeller rotates, the magnetic pole of the side, close to the first magnet ring, of the second magnet ring is the same as that of the first magnet ring, and the like poles repel each other, so that the stability of the impeller during operation is kept, noise generated during operation is reduced, and the service life of the magnetic drive pump is prolonged; liquid enters the pump shell from the flow guide pipe at the other end of the fixed box, the liquid entering the magnetic drive pump is filtered, blockage in the magnetic drive pump is avoided, and meanwhile it is avoided that ferromagnetic particles are adsorbed into the magnetic drive pump, and operation of the magnetic drive pump is affected.

Filter unit (5) for filtering a fluid in a hydraulic system, in particular for a coupling system (2), with a housing (10) for arrangement in the hydraulic system, wherein the housing has a flow section (15) for guiding the fluid along a defined flow path (S) through the filter unit (5), with a magnet (9) for separating ferromagnetic particles from the fluid, wherein the magnet is arranged inside the housing (10), wherein the magnet (9) is designed as a ring magnet (16), wherein the flow path (S) runs through a central opening (23) of the ring magnet (16), wherein a circumferential recess (17) is provided in an inner circumference of the housing (10), wherein the ring magnet (16) is recessed in the recess (17), characterized in that the recess (17) is designed as a stepped annular groove, wherein a receiving area (19) for receiving the magnet (16) is formed by a first step of the stepped annular groove, and a trapping area (18a) for forming a trap for the ferromagnetic particles is formed by a second step of the stepped annular groove, and in that a further trapping area (18b) is formed by a third step, wherein the receiving area (19) is axially located between the two Trap areas (18a,b) is arranged such that the ring magnet (16) is spaced apart from the housing (10) on both sides by means of an annular gap in sections.

The invention provides a multi-particle-size particle damping device based on double cavities and electromagnetic regulation and control. The multi-particle-size particle damping device comprises a damping shell; the damping shell is divided into a first chamber and a second chamber which are independent from each other through an insulating partition plate, and particles with different particle sizes are arranged in the first chamber and the second chamber respectively; an electromagnet is arranged at the end part of each cavity, and an electromagnet coil is wound on the periphery of each electromagnet; a current coil is arranged on the outer side of each cavity in a surrounding mode. According to the device, the two independent cavities are arranged to contain ferromagnetic particles with different particle sizes respectively, intelligent release and excitation of the particles are achieved through electromagnetic control, and therefore self-adaption and low-energy-consumption suppression of broadband vibration is achieved, the vibration reduction efficiency and reliability are remarkably improved, and the application range of the device is widened. Through the device, the problems of narrow vibration reduction frequency band, incapability of adapting to frequency change, high energy consumption and the like in the prior art are solved.

The invention belongs to the technical field of aero-engines, particularly relates to an oil abrasive particle detection device and method for a fuel oil system of a marine gas turbine, and aims to solve the problems of insufficient abrasive particle detection information and easy secondary pollution in the prior art. The device comprises a backwashing system and an abrasive particle separation and detection system, wherein the backwashing system realizes deep cleaning of a filter element through an ultrasonic massage box and a heat exchanger, and prevents secondary pollution of particles at wrinkles by adopting silicone oil paper; the abrasive particle separation system adsorbs ferromagnetic abrasive particles through a high-gradient magnetic field, and the image acquisition system shoots abrasive particle images through a transflective double-color light source and an automatic focusing objective lens. The method comprises the following three steps: firstly, separating abrasive particles through ultrasonic massage vibration and spray backwashing, then depositing the abrasive particles through a magnetic field, and finally, identifying the type of the abrasive particles through image processing and judging the wear degree. The method has the advantages of simplicity and convenience in operation, high detection precision and capability of qualitatively and quantitatively analyzing the abrasive particles, and is suitable for monitoring the wear state of a fuel system.

The invention belongs to the technical field of steam turbine generator unit monitoring, and particularly relates to a steam turbine generator unit oil leakage fault prediction method which comprises the following steps: measuring the temperature of an oil return port of a speed regulation steam valve in real time, and if the temperature is abnormally increased, determining that oil leakage occurs in the speed regulation steam valve; the motor current and power of the high-pressure adjusting oil station are measured in real time, and if the motor power is increased, the oil system leaks oil; oil pressure in the oil pipe is monitored in real time, if the oil pressure is reduced, oil leakage occurs, and the specific oil leakage position is comprehensively judged according to the temperature and the motor power; and the granularity of the ferromagnetic particles is monitored at the position needing to be lubricated, and if the granularity becomes small, it is judged that lubricating oil leaks at the lubricating position. The method has the beneficial effects that the monitoring precision is high, detection points are comprehensive, oil leakage and lubricating oil leakage at all positions of the steam turbine generator unit can be effectively detected, the detection result can be quickly processed after being sent, the response is timely and quick, and efficient and safe operation of the steam turbine unit is ensured.

The embodiment of the utility model provides a residual liquid treatment mechanism of a photocuring printer. The residual liquid treatment mechanism comprises a waste liquid collection box; the scraping plate is arranged at the top of the waste liquid collecting box and can move up and down along the box wall; the filter screen is arranged in the waste liquid collecting box and is used for intercepting large-particle impurities in the resin; the inclined guide plate is positioned at the bottom of the waste liquid collecting box, is downwards inclined and is used for guiding the resin to flow into the low-position area of the waste liquid collecting box; the magnetic adsorption assembly is mounted at the position, close to the waste liquid discharging opening, of the inclined guide plate and used for removing ferromagnetic particles in the resin under the action of a magnetic field; wherein the interior of the waste liquid collecting box is provided with a gradually-shrunk structure; a convex edge is arranged on the surface of the inclined guide plate; a stirring rod is arranged on one side of the magnetic adsorption assembly, a driving motor is connected to the stirring rod, and the driving motor drives the stirring rod to rotate regularly. Through the scheme of the embodiment of the invention, the problem of how to optimize the residual liquid collecting container so as to more thoroughly recover the residual resin can be solved.

The invention discloses a magnetic abrasive material based on an ultraviolet curing technology at normal temperature and a preparation method thereof, and belongs to the technical field of precision and ultra-precision machining. The magnetic abrasive material is composed of hard abrasive material particles, ferromagnetic particles and an ultraviolet curing adhesive. The preparation method of the magnetic abrasive material comprises the following steps that the hard abrasive material particles and the ferromagnetic particles are evenly mixed according to a certain mass ratio; adding an ultraviolet curing adhesive in a specific viscosity range, and stirring until the adhesive uniformly coats the surfaces of the particles; compacting the mixture into a thin layer; carrying out multi-direction curing under ultraviolet irradiation to form a cured green body layer; and crushing and screening the cured green body layer to obtain the magnetic grinding material with the required particle size. The method is carried out at the normal temperature, high-temperature treatment is not needed, equipment is simple, cost is low, production efficiency is high, the hardness, toughness and magnetic response performance of the abrasive can be flexibly adjusted and controlled by adjusting the adhesive formula, the particle proportion and the curing process, and the method is suitable for small-batch customized magnetic abrasive production.

The present invention relates to an additive in the form of a composite comprising ferrimagnetic particles of at least one iron-containing oxide, at least one first expanding agent having a structure whose volume can be increased by at least 50% by heating, and optionally at least one second expanding agent different from the at least one first expanding agent, which is at least one gas-releasing expanding agent, wherein the weight percentage of the ferrimagnetic particles, the weight percentage of the at least one first expanding agent and optionally the weight percentage of the at least one second expanding agent, each based on the total weight of the additive, supplement each other to at least 95% by weight, based on the total weight of the additive.Furthermore, the present invention also relates to a method for producing the additive, as well as to an adhesive composition comprising at least one additive according to the invention and its production. The present invention also further relates to the use of the additive in an adhesive composition.

The invention belongs to the technical field of tubular product machining transmission, and particularly relates to a self-adaptive speed regulation precision transmission device and method for tubular product machining, the self-adaptive speed regulation precision transmission device comprises a driving assembly used for generating driving force for rotation of an inner shaft, and the inner shaft comprises a magnetofluid bath used for containing magnetofluid and a driving assembly arranged in the axial direction of the magnetofluid bath and used for driving the inner shaft to rotate. The rotating magnetic field generating unit is used for generating a rotating traveling wave magnetic field in the magnetofluid bath and driving the magnetofluid to form circulation, so that ferromagnetic particles in the magnetofluid are arranged into a chain structure, and the magnetofluid is converted into solid-like magnetofluid; the rotating speed monitoring unit is used for detecting the actual rotating speed of the outer shaft; and the state monitoring sensor group is used for monitoring the state of the magnetofluid. The problem that in the existing tubular product machining process, a transmission chain cannot adjust the rotating speed and torque in a self-adaptive mode according to different machined pipes is solved, and meanwhile it can be avoided that natural vibration of a driving motor is transmitted to a tubular product through a mechanical transmission chain.

The utility model discloses a filtering and purifying device for ink production, which relates to the technical field of ink purification and comprises a tank body, a feeding pipe and a rectangular purifying pipe are arranged at the upper end of the tank body, a stirring rod is rotatably arranged in the tank body, an HEPA (High Efficiency Particulate Air) filter screen and an activated carbon filter screen are arranged in the rectangular purifying pipe; at least three groups of residue suction pieces are arranged on one side of the HEPA filter screen, each residue suction piece comprises a U-shaped box and a magnetic block, the U-shaped box is arranged on the air inlet side of the HEPA filter screen, and the magnetic block is arranged on the inner wall of the U-shaped box. According to the utility model, harmful gas is filtered through the HEPA filter screen and the activated carbon filter screen, so that ink is filtered and purified; when harmful gas passes through the HEPA filter screen, the harmful gas firstly passes through the periphery of the magnetic block, the magnetism of the magnetic block is utilized, tiny ferromagnetic particle impurities in the harmful gas can be adsorbed and collected in the U-shaped box, the situation that the HEPA filter screen and the activated carbon filter screen are blocked by the tiny ferromagnetic particle impurities for a long time can be prevented, and the quality and efficiency of ink filtering and purifying are improved.

This invention relates to the field of waste lubricating oil regeneration technology and discloses a comprehensive utilization process for waste lubricating oil from wind turbine generators. The process includes S1, pretreatment: removing larger particles, moisture, light components, ferromagnetic particles, etc., using distillation and filtration equipment to obtain a dehydrated intermediate product; S2, core refining: sending the dehydrated intermediate product into a dialysis tank composed of an organic-inorganic composite membrane for further treatment to remove additive components, base oil deterioration products, insoluble or oil-soluble substances, metal ions, etc., contained in the waste lubricating oil, obtaining a refined intermediate product. This comprehensive utilization process for waste lubricating oil from wind turbine generators effectively solves the problems in existing technologies where waste lubricating oil regeneration processes cannot achieve uniform dispersion of modified clay powder and the oil phase throughout the reactor, forming a large number of dead zones that prevent sufficient contact between the powder and the oil phase; and where saturated waste clay is directly discharged with the oil phase for filtration, increasing the amount of hazardous waste waste clay to be disposed of and raising disposal costs.

The application belongs to the field of mechanical equipment state detection, and particularly relates to a composite magnetic field sensor structure for lubricating oil particle detection, and a manufacturing method and a using method thereof. The composite magnetic field sensor comprises a permanent magnet ring, an induction coil, a shell, an end cover, a terminal, a first excitation coil and a second excitation coil. The permanent magnet ring, the induction coil, the first excitation coil and the second excitation coil are arranged in the shell. The induction coil is arranged on the outer circumferential side surface of the permanent magnet ring. The gap region in the shell is filled with pouring sealant, and a cavity is arranged for lubricating oil flow. The end cover is provided with the terminal for supplying power to the excitation coil and outputting the signal collected by the induction coil. The shell is provided with two threaded holes on the left and right surfaces for connecting the oil pipe. The application can clearly detect the distribution of metal particles in the oil, especially the ferromagnetic and non-ferromagnetic particles, which makes the detection range larger and more accurate.

This utility model discloses a ferromagnetic particle confinement structure for a stirring shaft friction source, including a ferromagnetic particle adsorption element and a box. The top of the box is open, and the internal cavity of the box is a receiving groove for accommodating the ferromagnetic particle adsorption element. The bottom of the box has a through hole for the stirring shaft to pass through, and the box is detachably fixed to the stirring shaft. The ferromagnetic particle adsorption element is used to collect magnetic particles generated during the operation of the stirring shaft. This utility model has the advantages of adsorbing and collecting ferromagnetic particles generated by continuous friction of the stirring shaft, avoiding the incorporation of metal foreign particles into the stirred product, reducing the risk of product contamination, providing a stable guarantee for improving product quality, and having a simple structure and strong practicality.

A cooling system (100) for thermal management of a component (102), the cooling system (100) comprising: a coolant circuit (104) comprising a plurality of sections; a magnetohydrodynamic pump (114) configured to pump a coolant around the coolant circuit (104) by applying a first electric field and a first magnetic field through a first section (106) of the plurality of sections, the first magnetic field being applied by a first electromagnet (124) of the magnetohydrodynamic pump (114), the first electromagnet (124) being an alternating current electromagnet, the coolant being an electrically conducting fluid comprising ferromagnetic particles; a substrate (126) comprising a second section (108) of the plurality of sections, the second section (108) being for fluidic communication of the coolant and for positioning adjacent the component; and a magnetic refrigerator (109) configured to, after heat is absorbed by the coolant in the second section (108) of the coolant circuit (104), cool the coolant by a magnetocaloric effect.

A system for inspecting a fluid (21) is provided. The system comprises: a lighting system (205) for illuminating a fluid (21) under inspection in an image detection area (25); an image capture system (201) for capturing a sequence of images of the fluid (21) in the image detection area (25); magnetic means (28, 28') for generating a magnetic field towards the image fluid (21) under inspection, the magnetic means (28, 28') comprising at least one coil (57) for generating a magnetic field, such that ferromagnetic particles comprised in the fluid (21) under inspection are prevented from reaching -or removed from- the image detection area (25); wherein the image capture system (201) is configured to capture an image of the fluid (21) located in the image detection area (25) before the magnetic field is applied and an image of the fluid (21) located in the image detection area (25) after the magnetic field is applied, therefore free of ferromagnetic particles; processing means configured to compare said images of the fluid (21) under inspection and count the ferromagnetic particles comprised in the fluid.

The utility model relates to the technical field of natural gas compressor filtering, in particular to a natural gas compressor filtering device which comprises a first transverse pipe and a first sealing ring, the two ends of the first transverse pipe are fixedly connected with the first sealing ring, and the two ends of the first transverse pipe are fixedly connected with a second transverse pipe through bolts. A natural gas compressor filtering structure is arranged on the inner wall of the first transverse pipe. According to the natural gas compressor filtering device, through the natural gas compressor filtering structure and the third filtering net, the third filtering net is a magnetic grid type filtering net, ferromagnetic particles (such as Fe2O3 and metal abrasion chippings) are adsorbed, a high-intensity magnetic field is prevented from interfering with other equipment, natural gas can be subjected to multiple filtering, the filtering quality is improved, meanwhile, the transverse rod can be rotated to drive the barrel to rotate, and the filtering efficiency is improved. When the first transverse pipe is disconnected, the first filter screen, the second filter screen and the third filter screen are fixed in the cylinder body through bolts, so that the first filter screen, the second filter screen and the third filter screen are convenient to disassemble and overhaul.

This utility model relates to the technical field of screening equipment, specifically to a screening device for preparing BPDA catalyst carriers. A feeding hopper is located at the top of the screening box, and a horizontally placed rotating drum is located below the feeding hopper inside the screening box. A magnetic material is installed inside the rotating drum to adsorb and remove ferromagnetic particles. A horizontally placed rotating roller is located below the first waste plate inside the screening box, and a screen plate is fixedly installed below the rotating roller. Material flowing down one side of the rotating drum falls onto the screen plate via a discharge plate for downward screening. The rotating roller drives a scraper to rotate, which scrapes the material sequentially along the screen plate and the abrasive plate. Part of the material scraped onto the abrasive plate is further crushed and ground by the scraper and abrasive particles before flowing down to the screen plate for screening. The remaining large particles are pushed by the scraper until they fall down along the second waste plate and are discharged, achieving a better screening effect.

The invention discloses an adsorption material for sewage treatment and a preparation method thereof, and belongs to the technical field of sewage treatment.The preparation method comprises the steps that sodium bentonite is dispersed through sodium hexametaphosphate, acrylic acid is neutralized and then subjected to a copolymerization reaction with sodium methallyl sulfonate in the presence of a cross-linking agent, and polymer modified bentonite is obtained; ferroferric oxide magnetic particles are loaded on polymer modified bentonite through ferric salt coprecipitation, lanthanum ions are used for surface complexing modification to obtain magnetic polymer modified montmorillonite, alkali lignin is sulfonated and then subjected to graft copolymerization with N-vinyl pyrrolidone, and defluorination type dispersing agent powder is obtained. And then physically mixing with the magnetic polymer modified montmorillonite, so that the obtained adsorbing material is high in magnetic separation recovery rate and beneficial to stable fluorine removal of sewage.

The present invention relates to a method for filling a cavity with a gap filler, in which the gap filler (13) is formed in a first part with a gap filler matrix and in a second part with electrically insulating, ferromagnetic particles (14) mixed into the gap filler matrix, in which the cavity is filled with the gap filler (13) at a filling point (12), in which at least one magnetic field acting on at least one geometric structure (15) of the cavity is applied such that the magnetic field lines run primarily parallel to an imaginary connecting line between the filling point (12) and the geometric structure (15), whereby the particles (14) attracted by the at least one magnetic field flow into the geometric structure (15) together with the gap filler matrix.

The application provides a detection method for a pipeline path in a soft package battery cell test fixture, and the detection method comprises the following steps: scattering ferromagnetic particles on a specified surface of the test fixture; injecting a magnetic fluid into a pipeline of the test fixture; and blowing air to the ferromagnetic particles to remove the ferromagnetic particles that are not attracted by the magnetic fluid, and the area of the ferromagnetic particles remaining on the specified surface is the area of the pipeline. The detection method uses the magnetic fluid and the ferromagnetic particles to achieve the purpose of detecting the pipeline path, and the magnetic fluid and the ferromagnetic particles do not have radiation effects and do not depend on the high temperature of the fluid, thereby effectively avoiding radiation hazards or scalding risks to the operator's body.

The utility model relates to the technical field of water treatment, and provides a water treatment purification device which comprises a purification body and a multi-stage filter element, and the purification body is provided with a water inlet and a water outlet; the multi-stage filter element is arranged in the purification body and comprises a magnetic filtration component and a membrane filtration component, a first flow channel is formed in the membrane filtration component, a second flow channel is formed in the magnetic filtration component, and the second flow channel is communicated with the first flow channel and the water outlet. Incoming water is adsorbed by an external magnetic field of the magnetic filtering component and then enters the membrane filtering component to be filtered; the magnetic filtering part located at the low position adsorbs ferromagnetic particles contained in incoming water, so that the load of pollutants reaching the surface of the membrane filtering part is reduced, the risk that the membrane filtering part is blocked is reduced, the assimilative capacity is improved, and the service life of a filter element is prolonged; moreover, the water filtered by the membrane filtering part enters the magnetic filtering part, and the water and media in the water are magnetized to generate purified water, so that the effluent quality is improved.