66 results about "Triboelectric effect" patented technology

The invention belongs to the technical field of electromagnetic induction and friction nanometer power generation, and particularly relates to a vibration energy collector based on electromagnetic induction and friction nanometer hybrid power generation. Comprising a friction nanometer power generation unit and an electromagnetic induction unit. The friction nanometer power generation unit comprises an upper insulating support plate, a lower insulating support plate and a friction pair; the friction pair comprises an upper friction assembly and a lower friction assembly, and the upper friction assembly and the lower friction assembly trigger the contact and separation process through external vibration to achieve friction electricity generation. The electromagnetic induction unit comprises a coil, a magnet and a steel body which are sequentially nested, the coil and the magnet are fixedly connected with the upper friction assembly and the lower friction assembly respectively, the steel body is fixedly connected with the lower insulation supporting plate, the magnet and the steel body form a closed magnetic circuit, and the magnet and the coil trigger relative movement through external vibration to achieve electromagnetic power generation. The device is novel in structure and distinct in gradation, integrates a triboelectrification effect and an electromagnetic induction principle, has high-voltage output and high-current characteristics, and can efficiently realize continuous conversion from environment vibration energy to electric energy.

The invention provides a low-coupling flexible self-powered multi-mode sensor and a preparation method and application thereof, and belongs to the technical field of flexible electronic materials. Comprising a temperature sensing layer, a pressure sensing layer and a humidity sensing layer which are stacked in sequence. The temperature sensing layer is made of a PEDOT: PSS / MWCNT composite material and outputs a temperature response signal through resistance change; the pressure sensing layer is formed by combining a PDMS layer with a micro-nano structure and a PET layer, and outputs a pressure response voltage signal based on a triboelectric effect; the humidity sensing layer is composed of PVA / CA composite matrix and EGaIn liquid metal, and humidity response signals are output through hygroscopicity induced resistance change. The sensor realizes simultaneous detection of three physical quantities of temperature, pressure and humidity, has low coupling degree among the sensing units, and can be applied to the fields of robot interaction, wearable health monitoring and environment monitoring.

The invention discloses a liquid cosmetic component analysis system based on a triboelectrification effect, the system comprises a micro-channel and a self-powered liquid sensor which are respectively used for micro liquid sample control and trace element component analysis, and the micro-channel is connected with a driving assembly used for driving liquid to flow; the self-powered liquid sensor is connected with a voltage acquisition assembly; the self-powered liquid sensor is of a multi-layer film sensing structure prepared based on the triboelectrification effect and the electrostatic induction effect. The multilayer film sensing structure comprises a glass substrate (1), a bottom electrode (2), a dielectric layer (3) and a top electrode (4) which are sequentially arranged from bottom to top. And the micro-channel (5) is bonded on the upper surface of the top electrode (4). According to the invention, the components in the liquid cosmetic can be determined based on different voltage signals generated by the triboelectrification effect, the miniaturization of cosmetic detection equipment can be realized, and the detection is simpler, more convenient and quicker.

The invention relates to the technical field of new energy, in particular to a natural-leaf-imitated 3D printing liquid drop friction generator which comprises a bionic blade main body structure, a bottom electrode, a friction layer and a top electrode which are sequentially arranged from bottom to top, the bionic blade main body structure serves as a substrate, and a rigid supporting framework is formed through a bionic vein network of the bionic blade main body structure; when liquid drops impact the prismatic surface, the liquid drops axially and directionally flow along a connecting channel of the vein network and are in contact with the friction layer, charge transfer between the bottom electrode and the top electrode is induced through a solid-liquid triboelectrification effect, meanwhile, a rigid skeleton of the vein limits excessive deformation of the FEP film, the spreading area of the liquid drops and the charge output density are synergistically improved, and the charge output density is increased. And the stability of an electrical path and the signal output efficiency are ensured.

Real-time monitoring of human body surface physiological information is a core function of wearable medical equipment. A micro-fluidic technology is paid attention to the field of biochemical physiological information sensing, but the potential of the micro-fluidic technology in the aspect of mechanical force physiological information sensing is not fully excavated, so that the realization of a multi-parameter integrated detection platform is hindered. The invention provides a dual-mode flexible physiological force sensor based on microfluid deformation. According to the sensor, capacitance and triboelectric effects are creatively fused, and the limitation of a single sensing mechanism is broken through. The liquid drop not only can be used as a deformable electrode to form a capacitance structure with the bottom electrode to realize static force detection, but also can be contacted with the PDMS dielectric layer for electrification to capture a dynamic force signal. By accurately regulating and controlling geometric parameters of the sensor, collaborative optimization of sensitivity and detection range is realized, and ultrafast dynamic response of 21ms is achieved. Experiments prove that stable underwater pulse monitoring can be carried out for 168 hours, and the biomedical potential of the underwater pulse sensor in the aspects of mechanical and biochemical signal fusion and overall physiological analysis is proved.

The invention discloses a triboelectric nano-generator prepared by spraying MXene on stretchable polyurethane fibers, a preparation method and an application of the triboelectric nano-generator. The triboelectric nano-generator is integrally of a layered coaxial linear structure and comprises a stretchable layer, a conductive layer, a triboelectric layer and a two-dimensional material layer from inside to outside. The stretchable layer is a polyurethane (PU) layer; the conductive layer is formed by tightly winding a silver wire or a silver-coated nylon wire on the stretchable layer; the triboelectric layer is a polyamide (PA) layer and is used for generating a triboelectric effect; the two-dimensional material layer is used for improving the electrical output performance. According to the method, the production of the triboelectric nano generator FM-TENG with the stretchable polyurethane fiber sprayed with the MXene is realized through a two-step weaving process; the prepared triboelectric nano generator FM-TENG has excellent mechanical performance, stable electrical performance and high customizability, and can be widely applied to the fields of human motion recognition, energy collection, self-powered sensing and the like.

The invention provides a microenvironment-adjustable 4D printed bone tissue scaffold as well as a preparation method and application thereof, and relates to the technical field of bone repair. The microenvironment-adjustable 4D printed bone tissue stent comprises a stent structure and a membrane covering the surface of the stent structure, and holes are formed in the stent structure; under the condition that the support structure is stressed and deformed under stimulation of ultrasonic waves, the holes are configured to be switched between the contact state and the separation state. In the stress deformation process of the stent structure, the holes can be switched between a contact state and a separation state, a triboelectric effect is generated, and then micro-current is generated, so that a physical microenvironment beneficial to cell growth is constructed, and regeneration of damaged bone tissues is further facilitated; ultrasonic waves are used as mechanical waves, extra mechanical stimulation is provided at the bone defect position, the scaffold structure can be stressed and deformed, the scaffold structure can also generate a piezoelectric effect and a triboelectric effect, the surface of the scaffold structure is induced to generate micro-current, and therefore a physical microenvironment beneficial to cell growth is constructed, and regeneration of damaged bone tissue is facilitated.

The invention discloses an application of a chiral polylactic acid piezoelectric material doped polyaniline composite friction film in degradation of organic pollutants. The application specifically comprises the following steps: adhering the chiral polylactic acid piezoelectric material doped polyaniline composite friction film to the bottom of a turntable, and adhering a friction bottom sheet to the bottom in a flat-bottom container; the organic pollutant solution is poured into the container, the rotating disc adhered with the friction film is placed in the container for equilibrium adsorption, and one side of the friction film faces upwards; the turntable is turned over to enable one side of the friction film to face downwards to form a friction pair with the friction bottom plate, and the turntable is started to rotate for friction catalysis to realize degradation of organic pollutants. The conductivity of polyaniline is combined with the piezoelectric and chiral characteristics of chiral polylactic acid, a flexible friction film is obtained through a solution casting method, the flexible friction film and a friction bottom form a friction pair, active free radicals are generated through the triboelectric effect, high-concentration organic pollutants are efficiently degraded, and environment-friendly and efficient pollutant degradation at normal temperature and pressure is achieved.

The present application relates to a method for separating a mixture in batches, said mixture comprising particles of at least two materials, for each batch, said method comprising the following consecutive steps: feeding one of the batches into a fluidization chamber (40) defined by a reactor (16) and obtaining a feed batch (38),-the particles of said batches are initially in a stationary state,-the particles of said batches are initially in a non-stationary state, and-the particles of said batches are initially in a non-stationary state. The fluidization is started and at least one fluidized bed (18) is obtained in the fluidization chamber, the fluidization is carried out by at least one rising fluid flow (42), which causes at least a portion of the particles of the feed batch to be in a suspended state, the fluidized bed being charged by the triboelectric effect,-the fluid flow (42) is altered, and the fluid flow (42) is changed into the fluidized bed (18). And discharging at least 90% by mass of the feed batch from the fluidization chamber,-passing the discharged batch through one or more electric fields, intended to separate the discharged batch.

The invention discloses switchable thermal management-self-energized sensing integrated high-breathability leather as well as a preparation method and application thereof, and belongs to the technical field of functional leather and intelligent wearable equipment. The radiation cooling side and the radiation heating side are designed on the two sides of the leather base body respectively, the radiation cooling side is composed of a porous bonding layer and an electrostatic spinning radiation cooling fiber membrane, and a through pore channel is formed to improve the moisture permeability efficiency; the radiation heating side achieves the efficient heating function through the vapor deposition photo-thermal polymer, the leather can autonomously switch the cooling mode or the heating mode according to the environment temperature and humidity through the combination of the two, meanwhile, self-energy-supply sensing is achieved through the integrated preset electrode, and human body movement can be monitored through the triboelectric effect without an external power source. The dynamic thermal management capability can adapt to seasons and day and night temperature differences, the limitation of a traditional single function is broken through, the problems that a coating is blocked, inorganic materials are prone to falling off, air permeability is reduced and the like are solved, and a multifunctional integrated solution is provided for intelligent wearable equipment.

The present invention discloses a passive pressure sensor based on piezoelectric potential enhanced triboelectric effect, comprising: an electrode layer, a flexible polymer material layer, a ZnO wrinkle layer, a ZnO nanowire layer and a negative polarity friction layer; wherein the thickness of ZnO deposited when making the ZnO wrinkle layer is 10nm-1μm, the thermal expansion coefficients of the flexible polymer material and ZnO used to make the flexible polymer material layer are not matched, and the top crystal plane of ZnO in the ZnO nanowire layer is a (0001) crystal plane. The pressure sensor provided by the present invention has higher sensitivity.

The invention discloses a gas-solid triboelectrification test method and device for a moving object, and relates to the technical field of triboelectrification measurement, and the method comprises the following steps: constructing a sample ball and gas triboelectrification model in a free falling process of a sample ball in a glove box with a built-in Faraday cage based on a Maxwell velocity distribution rule; carrying out standardized pretreatment on the sample small balls to remove residual charges on the surfaces of the sample small balls; performing air replacement in the glove box with the built-in Faraday cage until the internal air pressure and environmental parameters meet the test requirements, and determining the diameter range and the falling height of the sample small ball; filtering the electrostatic charge signal, reading the electrostatic charge quantity of the small sample ball at different falling heights, and determining the charge quantity increased by the small sample ball in the free falling process of the glove box with the built-in Faraday cage; the gas-solid friction electrification quantity of the moving object under the influence of the object moving speed, the effective friction area and the environment air pressure factor is measured in a non-contact mode.

The invention discloses a friction nanometer generator. The friction nano-generator comprises a magnetic square vibrator, which is used for generating micro-amplitude vibration in a low-intensity magnetic field environment; the stator electrode and the stator electrode electrification layer and the mover electrode and the mover electrode electrification layer are used for forming a frictional electric contact-separation process; the spring structure is used for connecting the magnetic square vibrator with the mover electrode and the mover electrode electrification layer so as to amplify micro-amplitude vibration to an amplitude sufficient to generate a triboelectric effect; the fixing bracket is used for supporting and fixing the stator electrode and the stator electrode electrification layer and is connected with the spring structure; and the circuit module is used for processing the electric energy generated by the friction nano-generator, so that the friction nano-generator is suitable for energy storage and load driving. According to the invention, the technical problem of low energy power supply efficiency easily caused by insensitive response to complex magnetic field distribution and unstable energy output of a friction nanometer generator in a weak magnetic field environment in the prior art is solved.

The invention provides a self-powered multifunctional sensor device, and the device comprises a pyroelectric TENG device which converts mechanical vibration into the electric energy of a sensor, and converts the external temperature change into an electric signal through a pyroelectric material; the temperature controller is used for controlling the temperature change sensed by the pyroelectric TENG device so as to simulate the external temperature change condition; and the data collector is used for displaying the electric signal provided by the pyroelectric TENG device. A pyroelectric effect and a triboelectric effect are combined, a dielectric friction layer material of a common contact separation type TENG is replaced by a pyroelectric material sensitive to temperature response, a part responding to external temperature is provided on the basis of self-power supply, and the self-power-supply technology enables the device to have extremely high sealing performance. The device can operate for a long time in an underwater environment without external power supply, has the characteristics of high stability, long service life and quick response, and can be suitable for various severe environments.

The present invention discloses a liquid cosmetic ingredient analysis system based on the triboelectric effect. The system includes a microfluidic channel and a self-powered liquid sensor respectively used for manipulating trace liquid samples and analyzing trace element components. A driving component for driving the liquid to flow is connected to the microfluidic channel, and a voltage acquisition component is connected to the self-powered liquid sensor. The self-powered liquid sensor is a multi-layer thin film sensing structure prepared based on the triboelectric effect and the electrostatic induction effect. The multi-layer thin film sensing structure includes a glass substrate (1), a bottom electrode (2), a dielectric layer (3), and a top electrode (4) sequentially arranged from bottom to top. The microfluidic channel (5) is bonded to the upper surface of the top electrode (4). The present invention can determine the components in liquid cosmetics based on different voltage signals generated by the triboelectric effect, can miniaturize the cosmetic detection equipment, and the detection is more simple and fast.

This invention provides an additively manufactured leaf-like three-source composite energy harvesting device, belonging to the field of new energy and self-powered technology. The device includes a leaf-vein-like support substrate integrally formed by 3D printing, and integrated on it a droplet triboelectric unit, a piezoelectric conversion unit, and a photovoltaic conversion unit. Liquid-guided stripes on the surface of the leaf-vein-like support substrate optimize droplet spreading. The droplet triboelectric unit captures the mechanical energy of the droplet through the triboelectric effect of the bottom electrode, the triboelectric dielectric layer, and the top electrode. The piezoelectric conversion unit converts the substrate vibration into electrical energy. The photovoltaic conversion unit efficiently collects solar energy. These three units work together to achieve synchronous or time-sharing capture of the droplet impact mechanical energy and solar energy, and output stable electrical energy through a power management circuit. This invention features a compact structure, high integration, and simple fabrication process. It can operate in all weather conditions and is suitable for long-term self-powered scenarios such as IoT terminals, distributed sensor network nodes, and wearable electronic devices.

This application discloses an online detection system, method, and related equipment for internal defects of hot-rolled sheet metal, relating to the field of intelligent detection technology in metal rolling. The system includes a high-temperature resistant triboelectric roller probe for rolling contact with the surface of the hot-rolled sheet metal to generate a raw electrical signal through the triboelectric effect; a signal processing module connected to the high-temperature resistant triboelectric roller probe for acquiring the raw electrical signal and processing it to obtain a preprocessed signal; and an internal defect detection module connected to the signal acquisition and processing module for receiving the preprocessed signal and detecting it based on a target deep learning model to determine the diagnostic result of internal defects in the hot-rolled sheet metal.

A conductive thumbtack needle utilizing triboelectricity comprises a base layer, a thumbtack needle body, a conductive layer and a friction layer, a bottom ring groove is formed between a bottom outer ring and a bottom boss in the base layer in a clamped mode, and the two ends of a bottom through hole formed in the base layer are flush with the bottom ring groove and the bottom face of a bottom flat layer respectively; a needle ring in the thumbtack needle is nested in the bottom ring groove, the bottom of the needle ring is connected with the top end of a needle rod, and the needle rod penetrates through the bottom through hole and then extends downwards out of the bottom flat layer; the middle of the bottom surface of the conductive layer is connected with the top of a guide insertion ring, a guide ring hole is defined in the guide insertion ring, the guide insertion ring is clamped and sleeved in the bottom ring groove, the bottom of the guide insertion ring is in contact with the top of the needle ring, and the top surface of the conductive layer is in contact with the friction layer; during application, electrical stimulation is carried out on acupuncture points through the triboelectric effect, and stimulation and adjustment on the acupuncture points are achieved. By utilizing the minimally invasive and safe characteristics of the thumbtack needle and the self-energized characteristic of triboelectricity, the thumbtack needle is independent of an external power supply, the application limitation is reduced, and the thumbtack needle has good portability and clinical application prospects.

The invention discloses a friction nano-generator and a preparation method thereof, and belongs to the technical field of generators. The friction nanometer generator comprises a first electrode plate, a power generation film and a second electrode plate which are sequentially arranged from top to bottom. The power generation film is composed of a first organic matter nano-structure layer, a first oxide layer, a base material layer, a second oxide layer and a second organic matter nano-structure layer. Tiny gaps are formed between the power generation film and the upper and lower electrode plates, so that the power generation film can be warped when being driven by wind power or water flow, is in periodic contact with and separated from the corresponding electrode plates, and generates alternating voltage and current signals based on a triboelectrification effect and an electrostatic induction mechanism. The metal oxide layer is introduced to serve as the transition layer, and the organic matter nano-structure layer is formed by the perfluoropolyether material in a molecular self-assembly mode, so that the efficient and stable friction power generation effect is achieved, the manufacturing process is simplified, and the production cost is reduced.

The invention discloses a differential vibration sensor, and particularly relates to the technical field of sensors. The differential vibration sensor comprises a shell assembly and a base connected with the outside of the shell assembly, the static plate assembly is fixed in the shell assembly through a plurality of fixing screws; the two moving plate assemblies are symmetrically arranged on the upper side and the lower side of the static plate assembly respectively, and each moving plate assembly comprises a moving electrode layer; the two elastic bodies are arranged on the outer sides, back to the static plate assembly, of the two movable plate assemblies respectively; wherein the static plate assembly comprises a static electrode layer, the static electrode layer and the moving electrode layer are oppositely arranged, and a gap is formed between the static electrode layer and the moving electrode layer to form a triboelectric effect structure; a plurality of guide studs are further fixed to the static plate assembly, and a guide hole is formed in the movable plate assembly. The differential vibration sensor provided by the invention realizes self-power supply by using a triboelectric effect, and does not need an external power supply.

The invention discloses a self-driven wave synchronous monitoring device and method integrating swinging-rolling motion, and the device comprises a pendulum bob main body with a hollow structure, and the interior of the hollow structure of the pendulum bob main body is fixedly provided with a roller-shaped friction nanometer generator. The pendulum bob main body is connected with the disc-shaped friction nanometer generator through a transmission system, and the drum-shaped friction nanometer generator and the disc-shaped friction nanometer generator synchronously respond to wave changes in different directions under the driving of the pendulum bob main body. The pendulum bob structure responds to wave excitation in different directions, through a double-structure joint sensing and multi-modal data fusion algorithm, the high-sensitivity sensing capability for multi-dimensional wave information is achieved, meanwhile, battery-free energy acquisition and signal output are achieved through the triboelectric effect, the advantages of being high in efficiency, compact in structure, high in adaptability and the like are achieved, and the application range is wide. The monitoring requirements for long time efficiency, low power consumption and high reliability in complex environments such as mariculture and offshore early warning are met.

An improved apparatus for the separation of gas or gas-vapor, as well as simultaneous product transformation or conversion of one or more of the separated gas or gas-vapor species, includes modification of a Ranque-Hilsch vortex tube to include an electric field internal to the vortex tube, created either by an applied potential or induced by temperature-dependent triboelectric effects, or a combination of both. The electric field is used to enhance separation of gaseous components, with particular emphasis on separation of CO2 from a gaseous mixture, and to promote subsequent conversion of the resulting separated gaseous product or products.

The invention relates to the technical field of intelligent door and window control and environment perception, in particular to an intelligent electric window device based on self-powered raindrop friction sensing, which comprises a window body used for realizing the opening and closing function of a window foundation; the monitoring mechanism can realize self power supply based on the triboelectric effect; the monitoring mechanism is at least used for monitoring the outdoor rainfall state in real time, generating a sensing signal and generating an effective trigger signal when the rainfall capacity reaches a preset threshold value. The state recognition mechanism is used for recognizing the opening and closing state of the window and feeding back a state signal; and the driving mechanism is used for receiving a trigger signal of the monitoring mechanism and a state signal of the state recognition mechanism so as to drive the window to execute opening and closing actions. The intelligent electric window device based on self-powered raindrop friction sensing disclosed by the invention can effectively solve the problems of passivity, single function, short endurance, insufficient monitoring precision and the like when an existing window product is used for coping with a complex environment scene.

The invention discloses a self-driven multifunctional sensor for an artificial hand wrist. An angle-speed detection mechanism and a pulse measuring ring are integrated; the angle detection mechanism is composed of a first rotor disc, a fixed stator disc and a friction layer, the first rotor disc and the fixed stator disc can rotate relatively, and sine electric signals corresponding to angle changes are output when the wrist bends and stretches based on the friction electrification effect. The speed detection mechanism generates a characteristic cycle electric signal related to the rotating speed through friction between a second rotor disc and a fixed electrode disc with a specific electrode; the pulse measuring ring is integrated on the inner side of the watchband, and the built-in flexible piezoelectric sensing module is tightly attached to the radial artery of the wrist, so that pulse fluctuation can be directly detected; the whole device does not need an external power supply, can generate sensing signals in a self-driven mode through mechanical friction and pulse pressure, and synchronously achieves simultaneous measurement of the wrist angle, the rotating speed and the pulse signals by means of a four-channel high-speed electrical measuring instrument and a multi-channel serial port circuit.

The invention relates to a preparation method of a nanofiber oil-gas separation membrane material with a mechanical regeneration function, which comprises the following steps: 1) preparing a polymer solution: dissolving two or more than two polymers in an organic solvent to obtain the polymer solution; the polymer comprises a positive electron affinity material and a negative electron affinity material; and 2) preparing the nanofiber membrane: performing electrostatic spinning, melt-blowing, solution airflow assistance, template synthesis, self-assembly or microphase separation on the polymer solution to obtain the nanofiber membrane. The polymer mixed solution is prepared into the single-layer nanofiber membrane with the endogenous triboelectric effect through the technologies such as electrostatic spinning, and the charge of nanofibers is remarkably increased. The nanofiber membrane does not need complex structural design, high-efficiency removal efficiency and reusability of the oil mist are achieved, and the device is suitable for a large-scale industrial ventilation system or environment-friendly equipment.

This invention discloses a self-generating wireless truck wheel hub temperature monitoring system, including a truck suspension vibration power generation device with a composite energy conversion coordination mechanism, and a matching wireless truck wheel hub temperature monitoring scheme. The device achieves self-powering for the temperature monitoring and wireless signal transmission system through an energy harvesting device installed on the truck suspension. The system mainly includes an antenna integrated with the truck suspension, a signal processing module, a self-generating module, and a temperature sensor. The self-generating module includes an electromagnetic power generation structure and a piezoelectric power generation structure. Combining electromagnetic induction, piezoelectric effect, triboelectric effect, and the multidirectional and nonlinear forces generated by the spring and arched beam structure, it broadens the energy harvesting bandwidth. The combination of the two power generation modules achieves broadband composite energy harvesting. The composite self-generating module powers the monitoring system, and the integrated signal processing circuit is responsible for power management and wireless transmission of temperature signals, improving the safety of truck operation.

The invention relates to the technical field of flexible sensors, and discloses a high-resolution ion skin preparation method and application, the high-resolution ion skin comprises a hard salt layer and a gel layer, the hard salt layer comprises water, a polymer, hard salt and water-soluble salt, the gel layer comprises water, a polymer and water-soluble salt, in the hard salt layer, the content of water is 45-65 wt%, the content of the polymer is 15-30 wt%, and the content of the hard salt is 20-30 wt%. The content of the hard salt is 2-10wt%, the content of the water-soluble salt is 5-20wt%, the content of the water in the gel layer is 60-85wt%, the content of the polymer is 10-30wt%, and the content of the water-soluble salt is 5-20wt%, the modulus differentiation composite structure in the high-resolution ion skin endows the high-resolution ion skin with unique tactile sensing performance, and the high-resolution ion skin has a good tactile sensing effect on the basis of the triboelectric effect. The high-resolution ion skin can have the fine texture recognition capability and the material recognition capability on the premise that the normal stress sensing capability is not affected, the high-resolution ion skin is used for the robot dexterous hand, the dexterous hand can be endowed with the stronger grabbing sensing capability, and a new application scene is developed.

The present invention relates to a stainless steel surface polishing device, comprising an electrostatic generating box and an installation panel arranged above the electrostatic generating box, a driving motor is fixed between the installation panel and the electrostatic generating box, a planetary gear assembly is arranged between the electrostatic generator and the installation seat, and a first collecting box and a second collecting box are alternately distributed around the driving motor between the installation panel and the electrostatic generator; the present invention utilizes the triboelectric effect to gather electrons on the collecting panel connected to the first conductive rod, and to gather positively charged ions on the collecting panel connected to the second conductive rod, so that an electric field is formed between adjacent collecting panels; and utilizes the positive feedback formed by the entry of the grinding chips into the first collecting box and the second collecting box, so that the electrostatic induction between the lower port of the collecting tube and the grinding chips is continuously strengthened, and the grinding chips are further collected in cooperation with the airflow generated by the exhaust fan, and by collecting the grinding chips, the friction between the generated grinding chips and the stainless steel surface is avoided, thereby improving the polishing efficiency.

In a vacuum cleaner unit (2) comprising a core (17), the core (17) comprises a clean air discharge device (10) and an annular air vortex chamber (11), the core (17) is configured to prevent static electricity accumulation at a location of at least a portion of an outer surface (18) of the core (17). In this way, a beneficial effect on the separation performance of the unit (2) is obtained. According to one actual choice, the core (17) comprises, at least at the location of the outer surface (18), a material configured to not allow the generation of a triboelectric effect by the friction or sliding of dirt particles against the outer surface (18). According to another actual choice, an electrically conductive material is used in the core (17), may be used in the exterior trim layer of the core (17), such that charge may be directed away from the outer surface (18).

In a vacuum cleaner unit (2) comprising a core part (17) including a cleaned air discharge arrangement (10) and an annular air swirling chamber (11), the core part (17) is configured to prevent electrostatic buildup at the position of at least a portion of an exterior surface (18) of the core part (17). In this way, beneficial effects to the separation performance of the unit (2) are obtained. According to one practical option, the core part (17) comprises at least at the position of the exterior surface (18) material that is configured to not allow for a triboelectric effect following from dirt particles rubbing or sliding against the exterior surface (18). According to another practical option, electrically conductive material is used in the core part (17), probably in an exterior finishing layer of the core part (17), such that electric charges can be led away from the exterior surface (18).