44results about How to "Prevent short circuit" patented technology

The utility model belongs to the technical field of heat exchangers, and particularly relates to a lean and rich liquid double-flow-channel heat exchanger which comprises a shell, a shell cavity is formed in the shell, and first liquid flows in the shell cavity. At least one baffle plate group is arranged in the shell cavity, the baffle plate group comprises a plurality of baffle plates, the baffle plates and the inner wall of the shell cavity are obliquely arranged, and through holes are formed in the surfaces of the baffle plates; the guide pipe is arranged in the shell cavity and penetrates through the through hole, so that the spiral cavity is formed in the guide pipe, the second liquid spirally flows in the spiral cavity, the flowing path of the second liquid in the guide pipe is increased, the heat exchange area of the second liquid in the guide pipe is increased, and therefore the heat exchange performance of the pipe side is improved. Meanwhile, the second liquid flowing spirally can generate certain centrifugal force, so that heat exchange between the second liquid and the inner wall of the guide pipe is more sufficient, and the heat exchange efficiency is further improved.

A system and method for charging a battery. A charger includes a frame providing a support structure. The frame defines a receptacle for receiving a battery. The charger includes an electrical interface associated with each receptacle configured to electrically connect to a contact of the battery. The power system is used for supplying power to the electrical interface to charge the battery. The charger is configured to stabilize storage horizontally or vertically.

The utility model discloses an external kitchen and bath equipment power-off protection wire, which comprises a protection device shell, the outer walls of the upper end and the lower end of the protection device shell are respectively provided with a reinforcing assembly, and the upper end of the protection device shell is connected with a four-core wire in a reinforcing and inserting mode through the reinforcing assemblies. A connector is inserted into the lower end of the protection device shell in a reinforcing mode through a reinforcing assembly, a filling block is installed in the protection device shell, and a PCB capacitor is further arranged in the protection device shell; through the design of the reinforcing assemblies, connection between the four core wires at the top end of the protection device shell and the connector at the bottom end is firmer, the reinforcing assemblies can ensure stable connection between the four core wires and the connector through cooperation of sliding blocks, clamping plates and rubber soft cushions, and the design effectively prevents the problem of poor contact caused by infirm connection; especially in a humid environment, potential safety hazards such as electrical fire, short circuit or electric leakage caused by poor contact of the wire and the connector are avoided.

This utility model discloses a charger with a storage battery, which includes a charger body and a mounting housing. The storage battery is installed in the lower part of the mounting housing, a battery management unit is installed on the upper part of the storage battery, and a charging control unit is installed on the upper part of the battery management unit. An input connector is installed at the front end of the mounting housing, and an output unit is installed at the rear end of the mounting housing. By switching the control module and the charging control unit in coordination, bidirectional energy management between the external power supply and the storage battery can be realized. When the external power supply is connected, it can directly power the electronic product and charge the storage battery simultaneously. When the power is off, it automatically switches to power supply from the storage battery. It can also charge the storage battery independently. It has the characteristics of uninterrupted power supply, dual-path operation and multi-path energy management. Combined with a safety protection module, it prevents overcharging, over-discharging, overcurrent and short circuit, improving the applicability and safety of the device in outdoor, emergency and mobile scenarios.

The utility model discloses a kind of inner cone plug-in cable connectors, it is related to the technical field of power cable connector.The utility model inner cone plug-in cable connector includes seat body, cable plug-in body and compression device;The seat body includes flange seat and connecting column body connected with each other, the inside of the connecting column body is equipped with fixed contact;The cable plug-in body includes insulating handle and power connection component, the insulating handle is sleeved in the outside of the power connection component, the bottom of the power connection component is connected with the fixed contact, the insulating handle is equipped with handle flange, the bottom of the handle flange is abutted with the top of the flange seat;The compression device includes cover and connecting piece, the top of the cover and handle flange is abutted, the connecting piece is sequentially through the cover and flange seat, to fix the insulating handle on the flange seat.The utility model inner cone plug-in cable connector is convenient to use, low in cost and high in safety.

The invention discloses an injection molding system and method based on magnetic field assistance. The injection molding system comprises an injection molding machine and an injection mold installed on the injection molding machine. The injection molding machine comprises a machine tool fixed plate, a machine tool movable plate and a plurality of machine tool guide rods; the machine tool guide rod is sequentially arranged among the machine tool fixed plate, the injection mold and the machine tool movable plate in a penetrating manner; the injection mold is internally provided with at least two cavities, each cavity is used for forming a corresponding product contour, the injection mold is internally provided with a plurality of magnetic conductive parts and non-magnetic conductive parts, the magnetic conductive parts are in butt joint with the machine tool fixed plate side or the machine tool movable plate side to form a magnetic circuit, and the non-magnetic conductive parts are in butt joint with the machine tool fixed plate side or the machine tool movable plate side. The non-magnetic components are used for isolating adjacent magnetic circuits and preventing short circuit of the magnetic circuits; and one or more magnetic circuits jointly defined by the magnetic conductive component and the non-magnetic conductive component pass through the cavity in a concentrated manner.

This invention discloses a soft-pack battery module structure for electric bicycles, belonging to the field of power battery technology. The module structure includes: a plurality of soft-pack cells arranged along a first stacking direction; an end plate disposed at the end of the cell stacking direction; and a side plate disposed on the side of the cell stacking direction. Both ends of the side plate have extensions perpendicular to themselves, which partially surround the outer edge of the end plate. The extensions and the end plate are detachably connected by fasteners, and together they form a rigid protective frame surrounding all the cells. This invention has the advantages of adaptively compensating for cell expansion clamping force to extend battery cycle life, high insulation protection reliability, modular and detachable design for low maintenance costs, and strong versatility to meet various configuration requirements.

The utility model discloses a high tensile steel-cored aluminum stranded conductor cable, which comprises a cable body, the cable body comprises a cable core and an outer functional layer, the cable core comprises a wire core, a protective layer and a high-strength alloy armor layer, the protective layer is arranged on the outer side of the wire core, the high-strength alloy armor layer is arranged on the outer side of the protective layer, and the outer functional layer is arranged on the outer side of the high-strength alloy armor layer. The protective layer comprises a wire core sheath layer, an inner insulating layer, a shielding layer and a high-strength tensile fiber layer. The tensile capacity of the steel-cored aluminum stranded conductor cable is enhanced, the operation stability of a power system is improved, and therefore the problems that although a traditional steel-cored aluminum stranded conductor cable has a certain tensile capacity, the tensile performance of the traditional steel-cored aluminum stranded conductor cable can be reduced under extreme weather conditions, external force damage or long-term heavy-load operation and other extreme conditions, and the service life of the cable is prolonged are solved. And the risk of cable breakage is increased.

This invention discloses a lithium-ion battery separator with a porous alumina-based composite material coating and its preparation method. The lithium-ion battery separator with the porous alumina-based composite material coating includes a base film and a coating on the base film. The coating includes modified porous alumina, which comprises porous alumina and lithium element supported on the porous alumina. The method for preparing the modified porous alumina includes: immersing the porous alumina in an aqueous solution of lithium salt, simultaneously stirring and sonicating under vacuum for 4-6 hours, drying, grinding into powder, and calcining at 400-600℃ for 2-4 hours under an inert gas atmosphere to obtain the modified porous alumina. The lithium-ion battery separator of this invention has high heat resistance, high wettability, and high ionic conductivity.

The utility model discloses a kind of power station boiler dry slag machine furnace bottom air leakage management devices, specifically related to the field of energy saving and emission reduction of power station boiler, including dry slag machine body, its furnace bottom air leakage is led out through cooling air exhaust interface, furnace bottom air leakage exhaust interface, tail air leakage exhaust interface;Connection pipe;Air blower one, air blower two;Booster fan;Secondary air box outlet;Slag bin, slag discharge room;Transition slag hopper.The power station boiler dry slag machine furnace bottom air leakage management device described in the utility model, by the redesign of the way that traditional dry slag machine cooling air enters hearth, solve the dry slag machine cooling air that is completed heat exchange with furnace bottom slag, as furnace bottom air leakage directly enter hearth to the disturbance of combustion, change dry slag machine cooling air from disordered furnace bottom air leakage to orderly air by secondary air, can effectively improve the stability of hearth combustion, reduce flue gas temperature, reduce fly ash combustible carbon content, thereby improve boiler efficiency, reduce coal consumption.

The application relates to the technical field of molecular beam epitaxy equipment, in particular to an aluminum source furnace structure which comprises a heat preservation shell, a crucible embedded in the heat preservation shell, a first heater arranged between the heat preservation shell and the crucible and a water cooling cover one arranged outside the heat preservation shell, and the crucible is provided with a loading cavity, and the opening end of the loading cavity is annularly provided with a flared climbing step. The flared climbing step is arranged to solidify the climbing aluminum liquid, provides space for the solidification of the aluminum liquid, does not affect the diffusion channel of the aluminum atomic beam formed in the crucible to outward diffusion, and does not form aluminum liquid drops. Even if the flared climbing step forms aluminum liquid drops, the aluminum liquid drops will not directly drop onto the liquid surface of the aluminum liquid in the loading cavity, and the liquid surface of the aluminum liquid will not be fluctuated, so that the aluminum atomic beam can effectively maintain uniformity and stability in the time scale, and the uniformity of the deposited film of the substrate and the film forming quality are effectively improved.

The application discloses a battery pairing device, comprising a base and a plurality of pairing mechanisms; the base is provided with a loading area and a pairing area arranged along a first direction; the plurality of pairing mechanisms are arranged in the pairing area along a second direction at intervals; the pairing mechanisms are movably connected to the base and can move between the loading area and the pairing area along the first direction. The application sets the loading area and the pairing area arranged along the first direction on the base, sets a plurality of pairing mechanisms arranged in the pairing area along the second direction at intervals, and enables the pairing mechanisms to move between the pairing area and the loading area along the first direction. This can load the batteries that need to be paired into the pairing mechanisms in the loading area, then the pairing mechanisms carry the batteries to move from the loading area to the pairing area along the first direction, pair the batteries that need to be paired with the batteries in the pairing area, prevent the batteries that need to be paired from colliding or short-circuiting with the batteries in the pairing area during loading, and thus improve the safety of battery pairing.

The application discloses a manufacturing method of a high-heat-dissipation-efficiency pouring type driving transformer, and belongs to the technical field of power electronic equipment manufacturing. The method aims to solve the technical problems of low heat dissipation efficiency and insufficient long-term reliability of the existing driving transformer caused by the limited heat conduction performance of the pouring material, the simple surface heat dissipation structure and the difficult coordination of internal thermal stress. The method comprises the following steps: constructing a three-dimensional digital model of a reinforced heat dissipation structure with a boss array and a groove array and preparing a corresponding forming die; positioning a magnetic core and a winding as an insert in a die cavity; pouring insulating colloid with different mechanical and heat conduction properties in batches in a vacuum environment; through a segmented curing process, the flexible colloid is fully filled in the internal gap and buffers the stress, and at the same time, the high-heat-conduction rigid colloid forms an external main body and a heat dissipation structure, thereby forming an integrated pouring body. The method is used for manufacturing the driving transformer suitable for high-power-density and high-heat-dissipation scenes, and can significantly improve the heat dissipation capacity and operation reliability of the driving transformer.

The utility model relates to the technical field of industrial camera vision, in particular to a temperature-controllable explosion-proof industrial camera, which comprises a shell which is a closed space and is in direct contact with a working environment; the heater is arranged in the shell; the temperature sensing switch is electrically connected with the heater; the power supply is suitable for supplying power to the shooting device and the heater; and the shooting device is arranged in the shell. The heater and the temperature sensing switch are arranged in the shell, so that the automatic temperature adjusting function of the industrial camera in a low-temperature environment is realized, and the shooting device is ensured to stably work in a proper temperature range; the closed explosion-proof shell is designed to effectively block external explosion and prevent internal electric sparks from leaking, so that the explosion-proof and temperature control functions are realized; the overall structure is compact and reasonable, the camera can reliably operate in severe industrial environments such as petroleum and chemical engineering, and the environmental adaptability and the service life of the industrial camera are remarkably improved.

The utility model relates to the field of load switches, and particularly discloses a sulfur hexafluoride load switch. The sulfur hexafluoride load switch comprises an upper shell and a lower shell, a plurality of upper static contacts are fixedly installed at the end, deviating from the lower shell, of the upper shell, a plurality of lower static contacts are fixedly installed at the end, deviating from the upper shell, of the lower shell, a main shaft is rotationally connected to the inner side of the lower shell, and the main shaft is rotationally connected to the outer side of the lower shell. The outer side of the main shaft is provided with a plurality of moving contacts matched with the upper static contacts and the lower static contacts, the outer side of the main shaft is provided with a plurality of positioning pieces used for fixing the moving contacts, and the inner side of the lower shell is fixedly connected with a plurality of insulating contacts used for limiting the moving contacts. The moving contact and the insulating contact are convenient to mount and dismount, parts are convenient to replace or maintain, the maintenance cost and time are reduced, the special structure of the moving contact can increase the contact area with the static contact, the contact resistance is reduced, and the energy consumption and heating are reduced, so that the service life of the switch is prolonged.

The utility model provides a perovskite laminated solar cell series assembly, which comprises a cell body, a conductive fine grid line, a bus main grid bar, a conductive back electrode and a switching conductive bar, and adopts a perovskite laminated structure, so that the solar spectrum absorption range can be widened, and the solar energy efficiency can be improved. The positive and negative electrode insulating strips and the negative electrode insulating strips cover the edges of the bus main grid bars and the conducting back electrode, electric leakage or short circuit can be prevented, the switching conductive strips are made of low-temperature conductive adhesive, the problem of material degradation caused by traditional high-temperature welding is avoided, the switching conductive strips and the positive and negative electrode insulating strips form mechanical interlocking through the switching notch structure, and the service life of the switching conductive strips is prolonged. The connection strength is enhanced, the contact reliability is ensured, the switching conductive strips adopt a double-sided conduction design and are seamlessly connected with the confluence main grid bars and the conducting back electrodes, low-resistance series connection between adjacent battery pieces is realized, the current transmission loss is reduced compared with that of traditional welding, and the operation stability of the solar battery piece assembly is remarkably improved.

This utility model discloses a main clutch switch structure for harvesting machinery, including two contact groups. Each contact group includes a movable contact and a fixed contact. The fixed contacts are all fixed on the same insulating component. One set of fixed contacts is connected in series in the engine starting circuit to conduct when the clutch is disengaged, allowing starting. The other set of fixed contacts is connected to the input terminal of the vehicle display screen to output an alarm signal when the clutch is engaged. The two sets of movable contacts are mounted on the same movable plate, with the movable contacts and fixed contacts arranged opposite to each other. The movable plate moves through a movable mechanism.

The utility model discloses a sensor acquisition circuit with a fault self-diagnosis function, a sensor and an instrument. The sensor acquisition circuit comprises a sensor signal input end, a signal conditioning circuit module and a diagnosis control module, the sensor is an electrochemical sensor with two electrodes, and the signal input end of the sensor comprises a working electrode signal end and a counter electrode signal end; the signal conditioning circuit module is used for carrying out reverse-phase amplification conditioning on the obtained sensor signal; the diagnosis control module comprises a control circuit, a first end of the control circuit is connected with a counter electrode signal end of the sensor, a second end of the control circuit is connected with an in-phase input end of the signal conditioning circuit module, a resistor R14 with a large resistance value is connected in series between the first end and the second end, and the diagnosis control module further comprises a control signal IO1 which is connected with a third end of the control circuit; on-off between the first end and the second end of the control circuit is controlled by controlling high and low levels of a signal IO1, so that the signal conditioning circuit module is switched from a normal working state to a fault self-checking state. And potential safety hazards caused by short-circuit and open-circuit faults of the sensor can be reduced.

The utility model provides a kind of current lead structure and nuclear fusion device, it is related to nuclear energy fusion technical field, the current lead structure includes conductor, front end cap and back end cap, the one end of conductor is opened with at least one pair of flow channel through hole along first direction, back end cap is set in one end of flow channel through hole, front end cap is set in the other end of flow channel through hole, back end cap and front end cap are close to the side of flow channel through hole respectively opened with the recess of the different flow channel through hole intercommunication, the one end of front end cap is respectively opened with the recess intercommunication liquid inlet hole and liquid outlet hole, wherein, first direction is perpendicular with the axial direction of conductor.The utility model can improve the insulation performance of current lead.

The utility model provides an underwater brushless motor. The underwater brushless motor comprises a stator assembly and a rotor assembly. The motor is characterized in that the stator assembly comprises a shell and a stator winding arranged on the inner side of the shell, and sealant wrapping the stator winding in a sealed mode is arranged in the shell; the rotor assembly comprises a rotor cylinder and a magnetic ring arranged on the side wall of the rotor cylinder in a sealed mode. A plurality of integrally formed paddles are arranged on the inner side of the rotor cylinder; at least two ceramic bearings are connected between the stator assembly and the rotor assembly, and the rotor assembly is rotatably connected with the stator assembly through the ceramic bearings. The motor adopts a non-central-spindle and non-support design, and the blades and the rotor cylinder are directly integrally formed, so that water flow and sundries can freely pass through the interior of the motor and are not easily wound by foreign matters such as silk threads, motor faults caused by jamming are reduced, and the system stability is improved.

The utility model relates to synchronous motor technical field provides a kind of plastic package waterproof claw pole permanent magnet synchronous motor, including casing, machine cover, stator is installed in the casing, the stator is provided with terminal, the terminal electrically connected has lead wire, the stator, the stator outer sleeve is equipped with plastic package layer, the terminal is wrapped in the plastic package layer, the fixed connection of the stator has claw, rotor is installed in the casing, the rotor inner sleeve is equipped with shaft, the rotor with the fixed connection of the shaft.The utility model in, by setting up plastic package layer will stator, terminal and lead wire seal protection, effectively insulate water vapor invasion, prevent short circuit and corrosion, significantly improve the operating stability and reliability of motor in humid or harsh environment;Meanwhile, claw is fixed on stator, cooperate the overall structure of casing and machine cover, further enhance the protection level of motor, prolong service life, with good waterproof performance, structural strength and application adaptability.

The utility model provides a kind of air outlet structure of bath heater, it includes bath heater main body and lifting part, the bottom surface of bath heater main body is lamp panel, installation cavity is opened on lamp panel, lifting part is located on installation cavity, bath heater main body is equipped with the drive mechanism of driving lifting part to drop, when lifting part is in the state of drop, air outlet is formed between lifting part and installation cavity, air outlet is communicated with the air duct inside bath heater main body. By setting liftable lifting part, when bath heater is idle, lifting part and installation cavity are closely matched, close air outlet, fundamentally block high humidity water vapor in bathroom into bath heater internal air duct and electrical components, effectively prevent internal components from damp, corrosion and short circuit, greatly improve the reliability and service life of product.

The application provides a semiconductor substrate and a manufacturing method thereof, the semiconductor substrate comprising: a composite plate comprising at least two metal layers based on a compression connection; the at least two metal layers comprising one molybdenum layer and at least one copper layer; an insulating medium layer covering the metal layers of the composite plate; a wiring layer partially covering the insulating medium layer; a protective layer covering at least part of the wiring layer; the one molybdenum layer and the at least one copper layer of the composite plate are connected through the compression connection, plastic deformation occurs at the layer interface of the molybdenum layer and the at least one copper layer to form mechanical interlocking, so that there is no macroscopic gap at the layer interface of the molybdenum layer and the at least one copper layer and the bonding strength is high; the composite plate can realize the performance complementation of copper and molybdenum, and has both strength and plasticity. Meanwhile, the composite plate formed by copper and molybdenum has higher thermal conductivity and strength than aluminum, and can meet the heat dissipation demand of a modular intelligent power system.

The utility model provides an energy harvesting type capacitor, which relates to the technical field of energy storage capacitors, and comprises a capacitor main body, a clamped piece is arranged at the top of the capacitor main body, a parallel transverse clamping groove is arranged on one side of the clamped piece, and the edge of the inner wall of the parallel transverse clamping groove is a fillet. The capacitor is generally large in size and dead weight, most of the capacitor is cylindrical, the surface of the capacitor is smooth and lacks stress points, the capacitor is prone to falling off in the clamping process, the installation difficulty is increased, the working efficiency is reduced, and in order to ensure the clamping stability, the clamping force of a clamping assembly needs to be greatly increased, so that the clamping efficiency is greatly improved. However, the increased clamping force can cause scratching of the surface of the capacitor, so that scratches are generated, even the outer layer of the capacitor is damaged, and internal substances flow out, which not only can influence the performance and the service life of the capacitor, but also can cause damage to the whole circuit system.

The utility model discloses a kind of increase insulation distance structure relay, it is related to relay technical field, including shell;Bottom plate being installed in the bottom of shell;Relay skeleton being installed in the top of bottom plate and being located inside shell;Load current loop mechanism being installed on relay skeleton;Relay magnetic circuit structure being installed inside relay skeleton and extending to outside, the inside of shell, bottom plate and relay skeleton are provided with corresponding point glue groove, and shell, bottom plate and relay skeleton are covered by glue through point glue groove.The utility model, by glue penetration principle, make relay internal high voltage and low voltage drive structure mutually isolated, increase insulation distance, improve the creepage distance of relay, and higher safety.

The utility model discloses an anti-misoperation control panel for a kneading machine, which relates to the field of control accessories and comprises a panel body, a display screen, an anti-touch mechanism and an anti-collision mechanism, the display screen is arranged at the upper end of the front side of the panel body, keys are arranged at the lower end of the front side of the panel body, and the anti-touch mechanism and the anti-collision mechanism are arranged on the panel body. The anti-touch mechanism is used for preventing fingers of a user from touching the keys by mistake, the anti-collision mechanism is used for preventing external objects from impacting the keys, the anti-touch mechanism comprises a convex frame, an indication groove, an insertion pipe, a spring, an insertion block and an abutting piece, and the convex frame is arranged on the outer side of the lower end of the front face of the panel body in an extending mode. The keys are independently separated through the convex frame and the indicating groove structure, fingers need to be accurately aligned with specific groove positions, the abutting pieces in the grooves adapt to the width of the fingers through the springs and cooperate with the limiting protrusions to stop transverse sliding, an operation area is forcibly limited, and mistaken touch of the adjacent keys is avoided.

The utility model relates to lithium battery safety protection technical field, specifically disclose a kind of lithium battery sealing explosion-proof shell, comprising: shell main part, it is the main shell structure for containing lithium battery, shell main part top opening place covers and locates top cover, and shell main part and the edge of positioning top cover are detachably sealed connection by bolt.This lithium battery sealing explosion-proof shell, through the multiple groups of pressure relief holes on the gas seat of the explosion-proof valve assembly around arrangement, improve the discharge efficiency, combine the gas guiding effect of auxiliary positioning frame through-hole, ensure that the large amount of high-temperature and high-pressure gas produced when lithium battery body violent thermal runaway rapidly diffuses, high-efficiency discharge, avoid shell internal pressure to exceed material strength limit in short time, prevent shell rupture explosion, avoid to cause secondary damage to surrounding battery and equipment, the cone structure and L-shaped frame of gas seat, further guarantee the stable of shell pressure relief process, improve shell explosion-proof reliability.

This utility model relates to the field of vehicle parts technology, and in particular to a vehicle-mounted PCBA sealing structure and a vehicle. The vehicle-mounted PCBA sealing structure includes: a PCBA component comprising a PCB board and electronic components mounted on the PCB board; a limiting member formed as a frame structure surrounding the circumferential edge of the PCB board, the inner wall of the limiting member being in contact with the PCB board, such that the inner wall of the limiting member and the PCB board form a glue injection cavity, the depth of which is greater than the height of the electronic components in the thickness direction of the PCB board; and sealant, filling the glue injection cavity to form a sealing layer on the surface of the PCB board, the shape of which is the same as the shape of the PCB board, and the thickness of which is greater than the height of the electronic components. This utility model can achieve sealing of all electronic components on the PCB board, effectively preventing dust, moisture, oxides, or corrosive substances from corroding the electronic components, and also has a reliable cooling and heat dissipation effect.

The utility model discloses a computer display screen assembles with OC testing arrangement, including test box and bearing fixture, install LVDS screen testing appearance, power adapter and booster board on the test box, the bearing fixture is by the limit horizontal bar, limit vertical bar no.

The utility model provides a heating device suitable for a large temperature range, which comprises an upper disc surface, a heat conduction disc, a transition heat conduction disc and an insulating layer which are sequentially arranged from top to bottom, the bottom of the upper disc surface is provided with an annular groove, the heat conduction disc is embedded in the annular groove of the upper disc surface, and a first cooling pipe and a heating wire sleeve are embedded in the heat conduction disc; the transition heat conduction disc and the insulating layer are of an annular structure and form a channel in the center, a protective pipe is inserted into the channel, and a corrugated pipe is arranged at the bottom of the insulating layer and sleeves the protective pipe; a back pressure pipe is arranged in the protective pipe, the top end of the back pressure pipe is connected with the upper disc face, and bias voltage is applied to the upper disc face through the back pressure pipe. The insulating layer comprises an insulating inner ring and an insulating outer ring, a first sealing groove is formed in the contact face of the transition heat conduction disc and the insulating inner ring, a first sealing ring is arranged in the first sealing groove, and a second cooling pipe is embedded in the position, corresponding to the first sealing groove, of the top face of the transition heat conduction disc.