59results about How to "Reduce ablation" patented technology

The invention discloses a high-voltage cable buffer water-blocking tape for preventing electric ablation, and relates to the field of high-voltage cable structures. The water-blocking fabric comprises a first fluffy cotton layer, a first filter cotton layer, a non-woven fabric layer, a water-blocking powder layer, a second non-woven fabric layer, a second filter cotton layer and a second fluffy cotton layer which are sequentially arranged from top to bottom, the first fluffy cotton layer and the second fluffy cotton layer are the same in structure, and copper films and tin-plated aluminum films are arranged on the inner sides and the outer sides of the first fluffy cotton layer and the second fluffy cotton layer. According to the invention, better water-blocking performance can be ensured, and electric ablation can be obviously prevented at the same time.

The utility model discloses a relay and an electricity meter. The relay comprises a static contact group and a movable contact group, and further comprises a movable magnetizer group and a static magnetizer. The movable magnetizer group and the movable contact group are relatively fixed, and the movable magnetizer group and the static magnetizer are oppositely arranged along the X-axis direction; the static magnetizer is fixed relative to one of other parts except the movable contact piece set and the movable magnetizer set, and static contacts of the two static contact pieces are located on the two sides of the static magnetizer respectively in the Y-axis direction. The projection of the part, suitable for making contact with the movable contact piece set, of each static contact on a second projection plane perpendicular to the Y-axis direction is located in the projection of the static magnetizer on the second projection plane, and the surface, facing the movable magnetizer set, of the static magnetizer is closer to the movable magnetizer set than all the static contacts in the X-axis direction. The electric meter comprises the relay. By adopting the above technical scheme, compared with the relay in the prior art, the relay is not easy to damage and has a longer service life.

The explosive welding method suitable for the large-area metal foil / substrate comprises the steps that threads are prefabricated on the periphery of the substrate, holes are formed in the symmetrical positions of the periphery of a wave impedance layer, and a metal foil plate is bonded to the lower surface of a wave impedance plate; the substrate, the supporting plate, the wave impedance plate, the heat absorption layer, the explosive and the detonator are sequentially installed from bottom to top. Wherein the metal foil plate, the wave impedance plate and the heat absorption layer jointly form a combined compound plate; a supporting plate is used for supporting the combined compound plate, a traction wire is adopted to penetrate through a hole in the wave impedance plate, and the traction wire is fixed to a fastener; after prepared explosives are laid on the upper side of the heat absorption layer, fastening pieces are screwed on the base plate, and the tensile force of the traction wires is adjusted through the screwing depth of the fastening pieces till the supporting plate in the middle can be smoothly drawn out; and a detonator is arranged at a detonating point of the explosive. According to the method, the problems of breakage, wrinkling, deformation and ablation of the metal foil plate caused by gap supporting in an explosive welding method are solved; and the welding quality of the metal foil plate and the substrate is improved.

The utility model provides an oil guide lubricating structure, a through axle and a vehicle, and relates to the technical field of automobiles, the oil guide lubricating structure is arranged in an axle housing of the through axle, a containing cavity is formed in the axle housing, and a bearing and a driven gear are arranged in the containing cavity; the oil guide lubricating structure comprises a connecting part and a lubricating part, wherein the connecting part is fixedly connected with the inner wall of the axle housing; the oil guide part is connected with the connecting part, an oil channel is formed in the oil guide part, and the oil channel extends from one end of the driven gear to one end of the bearing; the oil collecting part is connected to one end of the oil guide part, an oil storage cavity communicated with the oil duct is formed in the oil collecting part, and the bottom of the bearing is located in the oil storage cavity. According to the oil guide lubricating structure, oil thrown out by rotation of the driven gear can be received, the oil is guided to the bottom end of the bearing, and it is guaranteed that the through axle bearing is fully lubricated.

The invention provides a relay contact assembly and a relay, and relates to the technical field of electric power. The relay contact assembly comprises a pair of static contact leading-out ends, a movable contact spring, a first arc isolating piece and a second arc isolating piece, wherein the movable contact spring is used for being in contact with or separated from the pair of static contact leading-out ends; the first arc isolating piece is arranged outside the static contact leading-out end and is used for blocking arc transfer; and the second arc isolating piece is arranged on the movable contact spring and is used for blocking arc transfer. Under the combined action of the first arc-isolating piece and the second arc-isolating piece, the risk that the arc ablates the peripheral side wall of the stationary contact leading-out end and the peripheral side wall of the movable contact spring is reduced, the arc can be isolated more comprehensively, the transfer of the arc is hindered, and the thoroughness of arc extinguishing is improved.

The embodiment of the invention provides a pole piece, a battery monomer, a battery, electric equipment and a preparation method of the pole piece. The yield of the battery monomer can be improved. The pole piece comprises a first current collector, a first conductive layer and a first layer, the first current collector comprises a first body and a tab area connected to the edge of the first body, the first body comprises a coating area and an edge area, the first conductive layer is arranged on the surface of the coating area, the first layer is arranged on the surface of the edge area, and the first layer is arranged on the surface of the first conductive layer. A porosity of the first layer is less than a porosity of the first conductive layer.

The utility model relates to an operating mechanism for controlling closing and opening of a switch contact. The operating mechanism comprises a shell, coupling pieces arranged on the two sides of the shell, a rotating shaft assembly in transmission connection with the coupling pieces on the two sides, a spring assembly arranged between the rotating shaft assembly and the shell, and an electric operating device. One coupling piece is in transmission connection with the electric operation device; one end of the spring assembly abuts against the rotating shaft assembly, and the other end is rotationally connected to the shell. The rotating shaft assembly comprises a linkage shaft and a lever piece which are coaxially and rotatably connected, a first supporting shaft eccentrically arranged on the lever piece, and driving plates arranged on the two sides of the linkage shaft and in transmission connection with the coupling piece. Two ends of the first supporting shaft extend out of the lever sheet; an idle stroke groove is formed in the outer edge of the driving plate, and the extending end is rotationally arranged in the idle stroke groove. Compared with the prior art, an electric operating device can be installed at the side part of the utility model for driving an operating mechanism, and contact modules can also be installed at the left and right sides, namely in the middle of the mechanism, so that rapid switching-on and switching-off can be realized, and ablation of electric arc to contacts is reduced.

The vacuum contact comprises a static end contact and a moving end contact, the static end contact comprises a first transverse magnetic assembly and a first longitudinal magnetic assembly, the first transverse magnetic assembly comprises a first spiral arm contact piece and a first conducting rod, the first longitudinal magnetic assembly is of a hollow structure, and the first longitudinal magnetic assembly is arranged on the peripheral side of the first conducting rod in a sleeving mode; the first radial arm contact blade is fixed at one end of the first conducting rod and is in contact with the first longitudinal magnetic assembly; the moving end contact comprises a second transverse magnetic assembly and a second longitudinal magnetic assembly, the second transverse magnetic assembly comprises a second radial arm contact blade and a second conducting rod, the second radial arm contact blade is fixed at one end of the second conducting rod and is arranged opposite to the first radial arm contact blade, and the second longitudinal magnetic assembly is of a hollow structure and is fixed on the first radial arm contact blade. The second longitudinal magnetic assembly sleeves the peripheral side of the second conductive rod. The advantages of the two magnetic fields are combined to control movement and diffusion of the vacuum arc, and the breaking capacity of the vacuum contact is improved from the aspect of mechanism.

The invention belongs to the technical field of aerospace, and particularly relates to a low-temperature gas injection engine thermal protection method for the recycling process of a reusable rocket and application. According to the thermal protection method disclosed by the invention, the low-temperature gas film cooling distribution can be uniform, and meanwhile, the reusability of the rocket engine is improved. A cooling system is installed in the engine and comprises a gas cylinder supercharging device, an engine working device and a low-temperature gas injection device. Wherein the low-temperature gas injection device comprises a valve and a pipeline which are connected with the gas cylinder supercharging device, and a rotational flow runner and a buffer cavity directly connected with the rotational flow runner are arranged on the outer wall surface of the combustion chamber. When the rocket lands, low-temperature gas is injected into the combustion chamber through the rotational flow channel, forms a rotating gas film to be attached to the inner wall face of the combustion chamber under the action of centrifugal force and forms a vortex to be attached to the outer wall face of the engine under the action of reverse incoming flow, and ablation of high-temperature gas to the wall face of the engine is reduced.

The present invention discloses a composite cathode high-power plasma generator and arc-starting method, including a composite cathode, an arc-starting electrode, an inter-electrode plug-in, and an anode. The composite cathode is composed of an end face cathode and a ring target cathode. The end face cathode is located at the top and is fixed by a cathode support cooling unit, and then the ring target cathode, the arc-starting electrode, a plurality of inter-electrode plug-ins and the anode are sequentially connected in sequence; the end face cathode, the cathode ring, the arc-starting electrode, the inter-electrode plug-in, and the outer ring of the anode are all fixed by independent insulating rings to form a modular structure, which are coaxially and tightly insulated by circumferentially distributed clamping rods, and an arc channel is formed in the middle of all electrodes. An air intake ring capable of generating vortex gas is provided between each ring; the cathode support cooling unit is provided with an independent cooling channel for cooling the end face cathode. The invention adopts a modular structural design, which is convenient and reliable to install, and the power can reach hundreds of millions to several megawatts. The composite cathode effectively reduces cathode ablation, has stable discharge, and has a long service life.

The invention belongs to the field of aero-engine combustion chamber outlet parameter measurement, and particularly relates to an aero-engine combustion chamber outlet sample gas sampler, which adopts a local impact cooling heat exchange structure, improves the temperature resistance of the windward side of the sampler, and can prolong the service life of the sampler in a combustion chamber outlet complex parameter measurement process. The flow of cooling water is greatly increased, and the cooling capacity of the whole structure is improved; and the mounting seat cavity is designed to cool the mounting seat, so that the possibility that the mounting seat is ablated in a high-temperature state is reduced.

The present invention discloses a clutch friction element temperature field and thermal failure calculation method and system, belonging to the technical field of automobile clutch. The method comprises: S1, constructing a clutch model; S2, calculating the contact pressure between friction elements based on the clutch model and extracting the radial contact pressure; Fourier integral functioning the radial contact pressure to obtain the contact pressure function; S3, conducting an engagement test on the clutch, collecting the speed data during the clutch engagement process; and determining the convective heat transfer coefficient of the friction element based on the speed data; S4, calculating the total heat flux density between the friction elements based on the contact pressure function and the speed data; S5, calculating the radial temperature of the dual steel sheets based on the convective heat transfer coefficient and the total heat flux density; and obtaining the circumferential stress based on the radial temperature; S6, calculating the in-plane bending moment of the friction element based on the circumferential stress, and evaluating the thermal failure trend of the friction element based on the in-plane bending moment.

The invention belongs to the technical field of composite material preparation, and particularly relates to a tungsten infiltrated copper composite material and a preparation method thereof. According to the invention, through a multi-scale through pore network formed by'prefabricated material construction ', molten copper liquid can be rapidly filled along a large pore channel and fully permeates into the tail end of a small pore, so that the defect of'black core' generated by closed pores is thoroughly avoided. According to the prepared composite material, the tungsten phase and the copper phase respectively form a stable and communicated three-dimensional network, so that the unification of high conductivity (greater than or equal to 60% IACS), high strength and toughness (hardness greater than or equal to 100 HB) and excellent arc ablation resistance is fundamentally and synergistically realized, and the long-standing limitation of'impossible performance triangle 'is effectively broken through. And the process is high in integration level, green and remarkable in strengthening effect, and process simplification, environmental protection strengthening and performance improvement are achieved at one stroke. The advantages of raw materials and process cost are outstanding, the industrialization prospect is wide, and the relationship among high performance, designability and mass productivity is perfectly balanced.

The invention discloses an epoxy resin surface alternate spraying embedded composite coating and a preparation method, and belongs to the technical field of composite coatings, thermoplastic polyimide powder, thermosetting polyimide powder, nano alumina powder, deionized water and a binder are mixed, and spray granulation is performed after ball milling to obtain polyimide-nano Al2O3 composite powder; and the polyimide-nano Al2O3 composite powder and the Al2O3 powder are alternately sprayed on the resin-based composite material. The polyimide-nano Al2O3 composite material is introduced as the transition layer, so that high combination of the glass fiber reinforced resin matrix composite material and the aluminum oxide ceramic layer is ensured, and the temperature resistance and wear resistance of the matrix are improved. Aluminum oxide is of an embedded structure in the polymer-based nano composite coating, the highest bonding strength reaches 20 MPa, and the highest resistivity reaches 71 T omega.cm. And compared with a pure matrix, the bending strength after 150 times of ablation is 235 MPa and is improved by 28%, and excellent plasma ablation resistance is shown.

A thermoelectric chemical oxidation method based on magnetic field regulation and control comprises the steps that a first cylindrical electrode and a second cylindrical electrode are placed in two plating pools with electrolyte respectively, and a conductor wire rod penetrates through the electrolyte along the axes of the two cylindrical electrodes under traction of a winding device; a plurality of solenoids are arranged on the periphery of a plating tank, and the current in each solenoid is periodically and sequentially adjusted at different moments in the thermoelectric chemical oxidation process, so that a rotating magnetic field is generated on the periphery of the plating tank. According to the method, the movement of the plasma in the thermoelectric chemical oxidation process is regulated and controlled through the external magnetic field, the gathering of the plasma in the thermoelectric chemical oxidation process is reduced, the intensity of the plasma is reduced, and non-uniform ablation is avoided.

The invention discloses a tissue pathological section image positioning method and system. The positioning method comprises the following steps: S1, fixing tissue in paraffin to form a paraffin block; s2, the paraffin block is cut to obtain a plurality of tissue slices, in the cutting process, laser is used for conducting ablation on each tissue slice to form at least three mark points, and the first coordinates of all the mark points are recorded; s3, acquiring a slice image of the tissue slice with the mark point; and S4, obtaining a second coordinate of each mark point in the slice image, comparing the second coordinate with the first coordinate, and positioning the slice image based on a comparison result. The laser is utilized to directly and accurately ablate a plurality of mark points on each tissue slice, the marking efficiency is high, the accuracy is high, accumulated errors are greatly reduced, the positioning efficiency is improved, a large number of thinner tissue pathological slices can be obtained during tissue cutting, and the accuracy of tissue three-dimensional reconstruction is remarkably improved.

The invention provides a corona discharge shock wave balloon catheter which comprises an inner tube, a balloon is arranged outside the inner tube, and conductive liquid is arranged between the inner tube and the balloon. The positive electrode cable is arranged along the outer wall of the inner pipe, and at least one positive electrode is arranged on the positive electrode cable; the negative electrode cable is arranged along the outer wall of the inner tube, and the negative electrode cable is provided with at least one negative electrode; one negative electrode and at least one positive electrode form a group of electrode pair, the gap between the positive electrode and the negative electrode of the electrode pair is 3-10mm, and the voltage range of the electrode pair is 300-1000V. The positive electrode and the negative electrode of the electrode pair in the balloon catheter are arranged at intervals, and the voltage range of the electrode pair is set, so that the phenomenon of pulse corona discharge instead of pulse arc discharge is generated when the electrode pair works, the working voltage is lower and safer, the service life of the electrodes is longer, the electrodes are easier to process, and the sound pressure is more stable and controllable; the invention further provides stone crushing equipment.

The differential lubricating structure comprises an outer shell, a half axle gear, a planetary pin shaft and a planetary gear, the planetary pin shaft is installed in the outer shell in the radial direction, the planetary gear is connected with the planetary pin shaft in a matched mode, the half axle gear is installed in the outer shell in the axial direction, and the half axle gear is meshed with the planetary gear; a first oil inlet hole is formed in the end part of the outer shell, a radial oil channel is formed in the planetary pin shaft, an axial oil hole communicated with the radial oil channel is formed in the side part of the planetary pin shaft, and the radial oil channel is communicated with the first oil inlet hole through an elastic pin shaft; lubricating oil enters the radial oil channel through the first oil inlet hole and the elastic pin shaft and flows to the matching face of the planetary pin shaft and the planetary gear through the axial oil hole. The differential mechanism has the advantages of being compact in structure, good in lubricating effect, high in stability and the like, and the failure risks of planet pin shaft ablation, turning abnormal sound and the like of the differential mechanism are reduced.

The invention discloses a short circuit fault control method and device. According to the method, the fault estimation value is calculated by acquiring the real-time current and combining the F test algorithm with the real-time and estimated current values, and the fault estimation value is compared with the threshold value to judge the fault. And after the fault is confirmed, determining a short-circuit current zero point according to a zero point prediction algorithm, and cutting off the fault current at the point by using the circuit breaker. According to the invention, the accuracy and speed of fault detection are improved, and the operation opportunity of the circuit breaker is optimized, so that the problem that the short-circuit fault cannot be accurately controlled in the prior art is solved.

A molded case circuit breaker comprises an operating mechanism, a contact mechanism and an interlocking mechanism, an operating handle drives a moving contact to move through the operating mechanism, the interlocking mechanism comprises an interlocking piece and an interlocking spring, and the interlocking spring is used for driving the interlocking piece to lock the moving contact in a state that the moving contact cannot be in contact with a static contact. In the process that the operating handle moves from the opening position to the closing position, when the operating handle moves to the interlocking position, the operating handle or the operating mechanism drives the interlocking piece to unlock the moving contact, the operating handle is driven by the energy storage spring to move to the opening position and the closing position, and when the operating mechanism is not closed in place, the interlocking piece is driven by the energy storage spring to unlock the moving contact. According to the technical scheme, pilot connection between the moving contact and the static contact can be avoided, an operator can be helped to judge the working state of a product, misjudgment is avoided, potential safety hazards are reduced, when the operating handle moves to the action position, the closing force of the energy storage spring is larger, the moving contact can be driven to make contact with the static contact rapidly, and the rapid closing function is achieved.

The utility model discloses a steel core reinforced FRP pultruded section breaking and cutting device, and relates to the technical field of cutting equipment, the steel core reinforced FRP pultruded section breaking and cutting device comprises a rack, the inner bottom wall of the rack is provided with a section conveying piece, the inner top wall of the rack is fixedly connected with an electric push rod in an inserted mode, and the extending end of the electric push rod is fixedly provided with an adjustable double-head cutting piece. The adjustable double-head cutting piece is blocked through the blocking frame, so that the possibility that the adjustable double-head cutting piece directly cuts a cutter steel core is reduced, the two cutter heads of the adjustable double-head cutting piece are used for cutting the steel core and FRP respectively, the loss increase of the cutter heads is reduced, and the possibility that the FRP part on a sectional material is ablated and blackened is reduced; the first motor drives the rotating disc to rotate to control the section bar to rotate, when the two side plates expand, the hinge rod is promoted to be unfolded, the two section bar conveying cylinders are pulled to contract, and therefore the section bar is clamped through the section bar conveying cylinders so that the section bar can be conveyed conveniently, and the section bar is more convenient to rotate and convey.

The invention relates to the technical field of corrosion-resistant coatings, and discloses a preparation method of a 7075 aluminum alloy micro-arc oxidation ceramic film layer. Comprising the following operation steps that 1, the 7075 aluminum alloy is sequentially subjected to solution treatment and non-isothermal aging treatment, and the prefabricated 7075 aluminum alloy is obtained; and 2, the prefabricated 7075 alloy is immersed into the electrolyte, the prefabricated 7075 alloy serves as an anode, a stainless steel container with a cold system serves as a cathode, micro-arc oxidation is conducted in a constant-current mode, and a finished product containing the micro-arc oxidation ceramic film layer is obtained.

The present invention discloses a balanced force sealed electromagnetic relay, comprising a relay housing, an electromagnetic system is provided at the upper end of the relay housing, a contact system is installed at the middle end of the relay housing, a support plate is installed at the lower end of the relay housing, an arc extinguishing system is installed at the upper end of the support plate, and a rotating system is provided on one side of the arc extinguishing system. The moving contact and the static contact of the present invention move toward each other and contact, and the two are pressed against each other, so that the contact pressure can be quickly increased to the pre-pressure value, which can ensure a larger contact pressure and tracking, reduce contact erosion and wear, meet higher environmental indicators and life indicators, and ensure contact reliability during long-term work; when the moving contact and the static contact are separated in different directions, the moving contact end and the static contact end are quickly pulled apart, and the contact pressure drops rapidly from the pre-pressure value to zero at the moment when the contact is about to be disconnected, which can reduce the erosion time and the pull-in and release rebound when the contact resistance approaches zero, and improve the arc extinguishing effect.

The utility model provides an anti-arcing washing timer, which is characterized in that a reed group comprises a first reed positioned on the inner side and a second reed positioned on the outer side, both the first reed and the second reed are provided with contacts, a cam is provided with gear teeth, the gear teeth comprise inner gear teeth and outer gear teeth, the first reed is always elastically propped against the inner gear teeth, and the second reed is always elastically propped against the outer gear teeth. The second reed has the trend of always abutting against the outer gear teeth, the inner gear teeth and the outer gear teeth each comprise a tooth back side and a tooth end face, the tooth back side is a curved surface with the radius gradually increased, the tooth end face extends from the tail end of the tooth back side to the center direction of the cam, the radius of the tooth end face changes suddenly, and the contact is switched between the contact state and the disconnection state along with rotation of the cam. In the pair of reed groups of the washing timer, the two reeds can move along with the rotation of the cam, so that the disconnection and contact of the contacts can be quickly completed, the duration of sparks and arcing generated during the contact and disconnection of the contacts is short, the ablation process of the contacts is slowed down, and the service life of the product is prolonged.

The invention belongs to the field of metal coatings, and particularly relates to a laser cladding copper-based self-lubricating coating applied to a wind power sliding bearing and a preparation method of the laser cladding copper-based self-lubricating coating, and coating powder comprises the following chemical components in percentage by mass: 1-10% of nickel-coated graphite and the balance of tin bronze. The invention further discloses a preparation method of the coating, and the copper-based composite coating with excellent antifriction and wear resistance is prepared by optimizing the adding amount of nickel-coated graphite and adopting a laser cladding method. Compared with an original tin bronze coating, the hardness of the copper-based self-lubricating coating prepared through the method is improved, and the antifriction performance is obviously improved on the basis that the abrasion resistance is guaranteed. In addition, the coating is good in forming, free of cracks, low in porosity and good in combination with the substrate, and the technical problem that an existing laser cladding process is applied to the copper-based / graphite self-lubricating coating is solved.

The invention belongs to the technical field of aerodynamic thermal protection of hypersonic aircrafts, and discloses an array type arc heater cathode and a preparation method. The array type electric arc heater cathode comprises a needle-shaped array and a base body, wherein the needle-shaped array is embedded into the base body; the needle-shaped array is composed of needle-shaped metal wires, and the metal wires are made of low-work-function materials. The base body is made of high-thermal-conductivity metal. The preparation method comprises the steps of material preparation; preparing a template; threading the template; a fixed array; drying the array; casting the array; and repairing the array. According to the array type electric arc heater cathode and the preparation method, the whole cathode arc spots are dispersed into spot-shaped arc spots, the heat flux density of a single arc spot is reduced, then cathode ablation is reduced, and the array type electric arc heater cathode has the advantages that the number of the arc spots is larger, the arc spots are more dispersed, and the current of the single spot is smaller; the defects of oxide skin, ablation pits, ablation holes and the like caused by overlarge heat flux density of cathode arc spots are overcome, the service life of the cathode is prolonged, and the cathode has engineering practical value.

This utility model relates to an air outlet structure for a miniature circuit breaker. By setting a first air outlet and a second air outlet on the housing, a multi-channel arc-extinguishing path is formed. During the operation of the circuit breaker, the electric arc and heat generated inside can be quickly dissipated through these two air outlets, preventing the airflow from interfering with each other within the arc-extinguishing assembly. This effectively reduces the residence time of the electric arc inside the circuit breaker. The first air guide wall between the arc-extinguishing assembly and the first air outlet, and the second air guide wall between the arc-extinguishing assembly and the second air outlet, play a role in precisely guiding the airflow. When an electric arc is generated, the air guide wall can guide the airflow in an orderly and uniform manner to the arc-extinguishing assembly, forming a stable and suitable airflow field around the arc-extinguishing grid. This airflow field helps to quickly remove the heat and plasma generated by the electric arc, accelerate the arc extinguishing process, improve the arc extinguishing efficiency, reduce the erosion of the internal components of the circuit breaker by the electric arc, and enhance the breaking capacity and reliability of the circuit breaker.

The invention discloses an arc extinguishing system and an electric appliance switch thereof, and belongs to the technical field of electric appliance equipment, the arc extinguishing system comprises a front arc extinguishing grid plate group and a rear arc extinguishing grid plate group which are connected in parallel, and the front arc extinguishing grid plate group is connected with a static arc striking grid plate and a movable arc striking grid plate; when one rear arc extinguishing grid plate group is arranged, two ends of the rear arc extinguishing grid plate group are respectively connected with the static arc striking grid plate and the movable arc striking grid plate, and when multiple rear arc extinguishing grid plate groups are arranged, one end of the first group is connected with the static arc striking grid plate, and one end of the second group is connected with the movable arc striking grid plate; when a plurality of groups of rear arc extinguishing grid sheet groups are arranged, the arc extinguishing grid sheet structure also comprises arc striking grid sheet groups, the front ends of the arc striking grid sheet groups are attached and inserted among the arc extinguishing grid sheets of the front arc extinguishing grid sheet group, the rear ends of the arc striking grid sheet groups are respectively connected with the end parts of different rear arc extinguishing grid sheet groups, and the different rear arc extinguishing grid sheet groups are connected in series through the arc striking grid sheet groups. According to the invention, the intervention time of the arc extinguishing grid sheets can be shortened, the initial arc energy is greatly reduced, the duration of the metal phase arc is reduced, the number of the arc extinguishing grid sheets can be increased, and the breaking capacity and the electrical life of the electric appliance switch are greatly improved.

The invention belongs to the fields of 3D printing additive manufacturing, metal surface treatment, welding and metal surface repair, and specifically relates to a cathode-free plasma generator, which is characterized by comprising: a gas dividing ring, a cathode guide column, a blocking medium, a working power anode, a working power cathode, a gas channel, an arc starting stage, an outer shell, an inner shell, a radio frequency power supply, a radio frequency power anode, an insulating pad, a sealing ring, a cathode support and an anode insulating pad. The invention utilizes a dual power supply system, one radio frequency power supply is used for arc starting, and the other is a working power supply. When working, the radio frequency power supply first forms a micro-point halo with the blocking medium, and then the working power supply forms a plasma arc with the blocking medium, so that the ablation of the cathode during arc starting is greatly reduced. The blocking medium and the cathode are tightly connected. The anode plasma arc of the cathode-free plasma generator involved in the invention is not directly generated with the cathode, and the cathode is basically free of ablation, which greatly improves the life of the cathode.

A clamping type contact system comprises a moving contact assembly and a static contact, the static contact is provided with a static contact main contact part and a static contact second breakdown part, and the moving contact assembly is provided with a moving contact assembly main contact part and a moving contact second breakdown part at positions corresponding to the static contact main contact part and the static contact second breakdown part. In the process that the moving contact assembly rotates to leave the static contact, the moving contact assembly main contact part and the static contact main contact part are separated first, and then along with rotation of the moving contact assembly, the distance between the moving contact assembly main contact part and the static contact main contact part becomes larger and larger. And the distance between the second breakdown part of the moving contact and the second breakdown part of the static contact becomes smaller and smaller. According to the moving contact system, the second breakdown points are arranged on the moving contact and the static contact, so that the electric arc is quickly led out from the main contact part, the ablation of the moving contact and the static contact is reduced, and the electrical service life of the switch is prolonged.