38results about How to "Reduce heat build-up" patented technology

A method for writing data to a display includes the steps of receiving a plurality of data bits, where each bit is associated with a different pixel of the display, reading the value of each data bit, determining whether each data bits has an off-state value, and generating a disable signal if each data bit has an off-state value. Responsive to a disable signal, the method further includes suspending the transfer of data to the pixels of the display, turning off a light source (e.g., an LED, laser, etc.) for a time period dependent on the significance of at least one of the data bits, and / or forcing each pixel of the display into an off state for a time period dependent on the significance of at least one of the data bits. A display driver circuit for performing the methods of the present invention is also disclosed.

The invention discloses a tuyere structure and an air conditioning system. The tuyere structure is used for an air outlet structure on the side of an air conditioner. The tuyere structure includes an air guide assembly, and the air guide assembly includes a first air guide plate for horizontal air supply and downward air supply. , the first air deflector has an arc-shaped plate section, the inner concave surface of the arc-shaped plate section is the air-guiding surface; and the arc-shaped plate section is bent along the air supply direction of the first air guide plate. The tuyere structure disclosed in the present invention can increase the included angle between the air supply angle of the first air deflector and the horizontal direction, that is, can increase the sweeping range of the entire tuyere structure, and more hot air can be absorbed during the heating process. The downward row can effectively reduce the degree of heat accumulation formed on the top of the room due to the low density of hot air, speed up the increase of the indoor temperature, improve the uniformity of the indoor temperature, and then improve the heating performance; it also improves the cooling performance and reduces the Air volume loss.

The invention discloses a heat dissipation structure of a high-power light-emitting diode (LED) illuminating lamp, which belongs to the technical field of electrons. The heat dissipation structure comprises a cylindrical LED chip base-column, a heat dissipation shell, a retaining washer and a screw opening, wherein the external surface of the heat dissipation shell is provided with a micro-slot structure; the heat dissipation shell is sleeved outside the cylindrical LED chip base-column; the retaining washer is sleeved on the front end of the chip base-column, and connected with the heat dissipation shell by bolts; the screw opening is connected and fixed with the heat dissipation shell by the bolts, and connected with the chip base-column by contact points; the external surface of the rear part of the chip base-column is provided with a cylindrical contact curved surface which is fitted with the heat dissipation shell, and the heat dissipation shell is provided with fins. By using the heat dissipation structure of the invention, the heats gathered on the chip part can be quickly reduced, thereby minimizing the temperature of the high-power LED lamp; and because the chip base-column is detachable, when the LED chips reach the usage life-spans thereof or are damaged because of other reasons, the whole LED lamp is not required to be replaced but just replacing the chip base-column.

The invention discloses a laser stamping forming method and device, and belongs to the technical field of laser processing. The laser stamping formingdevice comprises a laser, a light guide system, aworkpiece die system and a control system. According to the laser stamping forming method, first a plate and a die are placed in a sealed cavity, a vacuum pump is used forpumping air out from the sealed cavity, so that a close-to-vacuum state is formed in a die cavity, and then the plate is formed by using laser-induced shock waves. The laser stamping forming method and device have simple equipment and donot need complicated dies,flexible processing can be realized by controlling the position of a manipulator, processing parameters are good in controllability, safe and reliable operation is achieved, and the laser stamping forming method and device have potential market application value.

The invention relates to a laser deposition scanning path planning method. The method comprises the steps that forming zones for performing additive manufacturing are selected by means of two standards of a temperature value and distance; sequential order of the forming zones is controlled for avoiding ineffective strokes, lowering heat input to the maximum extent and improving the forming efficiency; and the scanning direction of a laser head is adjusted by 90 degrees for additive manufacturing, so that the associative property between layers is enhanced, and the quality of parts is improved.

The invention provides a multi-split air conditioner control method and device and an air conditioner. The method comprises the steps of detecting the air return temperature of an indoor unit; when the air return temperature is larger than or equal to a preset halt threshold value, controlling the indoor unit to enter the standby mode; by adopting the first time as an interval, circularly startingan internal fan. In this way, the internal fan is operated one time at the interval of the first time for performing air circulation, thermal aggregation inside the indoor unit is lowered, and therefore the influence of thermal aggregation on temperature monitoring is lowered, the disturbance caused by thermal aggregation inside the indoor unit on detected values is avoided, and the misjudgment possibility is eliminated.

The invention provides a battery. The battery comprises a battery cell, a first circuit board assembly and a second circuit board assembly; and the battery cell comprises an electrode assembly, a shell for accommodating the electrode assembly, one or more first tabs, one or more second tabs with the polarity different from that of the first tabs, and third tabs with the polarity different from that of the first tabs. The shell comprises a first surface and a second surface opposite to the first surface. The shell is a metal shell. The electrode assembly includes a first pole piece and a secondpole piece. The first tab is electrically connected with the first pole piece and is exposed out of the first surface; and the second tab is electrically connected with the second pole piece and is exposed out of the second surface. The third tab is electrically connected with the second pole piece and is exposed out of the first surface. The first circuit board assembly is electrically connectedwith the first tab and the third tab. The second circuit board assembly is electrically connected with the second tab. The invention further provides an electric device with the battery.

The invention discloses a novel movable energy accumulation device using foamy copper phase change materials. The novel movable energy accumulation device comprises multiple single body phase change energy accumulators which are connected in parallel. Each single body phase change accumulator comprises a sealed cylindrical shell. Each shell comprises an outer-layer sleeve, an inner-layer metal sleeve and an interlayer, wherein a sealing opening in the upper end of a superconduction heat pipe is inserted in the upper portion of the interior of the shell, and an opening in the lower end of the superconduction heat pipe is exposed out of the shell and is connected with a waste heat source; the part between the inner-layer sleeve and the superconduction heat pipe is filled with the foamy copper phase change materials; and a spiral pipeline is further arranged in the shell to pass between the phase change materials, and the shell interlayer and the spiral pipeline in the shell are cold water channels. The multiple single body phase change energy accumulators are erected side by side, water inlets in the upper ends of the multiple single body phase change energy accumulators are connected with a water inlet pipe, and water outlets in the lower ends of the multiple single body phase change energy accumulators are connected with a water outlet pipe. According to the novel movable energy accumulation device, the superconduction heat pipe is used for recycling waste heat, heat transmission is fast, and the heat transmission efficiency is high; the heat conduction coefficient of the phase change material is increased through foamy copper, and the heat accumulating and releasing rate is increased.

Radial-type pneumatic tires for vehicles having a radial carcass, a profiled tire tread, a belt and a single-layer or multi-layer bandage covering the belt, which bandage has reinforcements extending in the circumferential direction of the tire and includes at least one thread made of a textile material, such as polyamide, polyester or rayon. The thread has a fineness of ≦700 dtex.

The invention discloses a novel efficient thermal field control polishing machine and a polishing method thereof. The polishing machine comprises a controlling box, a machine frame, a correction disc,a correction disc supporting plate, a correction disc driving motor, a correction disc driving wheel, a correction disc fixing base, a workpiece ring driving motor, a workpiece ring driving wheel, workpiece rings, marble, a workpiece ring supporting plate, a workpiece ring base, a water basin, a correction disc wheel, a motor, a lower supporting plate, a tray, a rotating disc bearing and a wateroutlet. The marble is hollow. The invention further provides a polishing method of the novel efficient thermal field control polishing machine. The hollow marble disc is arranged, and therefore original one-way flowing of polishing liquid is changed into two-way flowing, flowing of the polishing liquid is accelerated, and therefore distribution of polishing powder on the surface of a polishing disc is uniform, and the surface quality of an optical element is improved. The surface thermal field distribution is uniform, heat accumulation during the polishing process is reduced, surface convergence efficiency is improved, and processing efficiency is improved.

The invention belongs to the technical field of proton irradiation resistant semiconductor devices, and particularly relates to an anti-proton-irradiation InP-based HEMT device based on an aluminum nitride / silicon nitride stacked structure and a BCB bridge. The surface of the InP-based HEMT is covered with an AlN / Si3N4 stacked structure and a BCB bridge to serve as a passivation layer of the device, wherein the AlN / Si3N4 stacked structure can better inhibit the surface effect of the device; meanwhile, surface defects caused by plasma damage in the Si3N4 growth process of PECVD equipment are reduced; the BCB material has excellent nuclear resistance and electron resistance, the BCB bridge reduces parasitic distributed capacitance of the device and reduces internal heat accumulation of the device, proton irradiation resistance of the device is effectively improved, and influence on characteristics of the device is reduced.

The invention discloses a novel movable type energy storage device using superconductive tubes and copper foam phase-change materials. The novel movable type energy storage device using the superconductive tubes and the copper foam phase-change materials comprises a plurality of parallel single phase-change heat accumulators, wherein each single phase-change heat accumulator comprises a closed cylindrical shell; each shell comprises an outer sleeve, an inner metal sleeve and an interlayer; the interlayer of each shell is a cold water channel; a spiral guide ring is arranged in the interlayer of each shell; a superconductive tube is arranged in each shell; the upper end of each superconductive tube is sealed and inserted in the upper part of the inside of the corresponding shell; the lower end of each superconductive tube is open, is exposed outside the corresponding shell and is connected with a waste heat source; a phase-change material which is used for filling holes of copper foam is used for filling between the corresponding inner sleeve and the corresponding superconductive tube; the single phase-change heat accumulators are erected side by side; a water inlet of the upper end of each single phase-change heat accumulator is connected with a water inlet tube through a water collecting square tube; and a water outlet of the lower end of each single phase-change heat accumulator is connected with a water outlet tube through a three-way tube. The novel movable type energy storage device recycles the waste heat by the superconductive tubes, and is quick in heat transmission and high in heat conduction efficiency; and by the copper foam, the heat conduction coefficient of the phase-change materials is improved by the copper foam, and heat storage rate and heat release rate are increased.

The invention relates to an automated planting greenhouse temperature and humidity control system and a method thereof. A microcontroller is connected with a wireless data transmission module, and themicrocontroller is connected with a communication network by means of the wireless data transmission module, so that the connection between the microcontroller and the communication network is realized; the communication network is also connected with a server-side. After the method is adopted, the phenomenon that in the prior art, a fixedly connected assembly structure increases the difficulty in maintenance and debugging is effectively avoided; maintenance or debugging needs to be performed in an area which is not large in a box body, so that the difficulty in maintenance and debugging is increased, analog signals are lost and can not eventually be converted into digital signals and sent to the server-side, and the defect adversely affects the integrity performance of the digital signals.

The invention relates to the technical field of granaries, in particular to a granary with a low-temperature storage function. The granary comprises a granary body, wherein the granary bottom of the granary body is sealed by a bottom plate, the granary body is provided with a grain inlet and a grain outlet, and the granary body is arranged above the ground; a partition plate and a supporting plateare sequentially arranged at the positons, above the bottom plate, in the granary body in parallel from bottom to top, a second cavity is formed between the partition plate and the supporting plate,and a third cavity used for storing grain is formed above the supporting plate; a plurality of cold air flow assemblies are arranged at the bottom of the granary body, air inlet flow channels are formed in one sides of heat insulation plates, and air outlet flow channels are formed in the other sides of the heat insulation plates; and communicating holes are reserved between the bottom ends of theheat insulation plates and the bottom walls of heat conduction metal straight pipes, and the air outlet flow channels communicate with the second cavity. The device can achieve the purposes of cooling and ventilation of the granary by utilizing the properties of the device, meanwhile, the device is ingenious in structural design and low in manufacturing and mounting cost, and the possibility of heat accumulation and mildewing is reduced, so that the safety of grain storage is improved.

The invention discloses a greenhouse temperature and humidity control system and a method thereof. The system comprises sensors and controlled equipment, wherein the sensors and the controlled equipment are all connected with a microcontroller; the microcontroller is connected with a server; monitoring terminal equipment and the server perform information interaction through a wired or wireless mode; the server is frequently arranged in the server chassis; and the server chassis comprises a hollow cuboid-shaped shell and a cover plate pivoted on the hollow cuboid-shaped shell. In combination with the method thereof, the defects in the prior art that replacement is not easy; the overdue state of a dehumidizer can not be determined efficiently; the replacement speed is quick; the dehumidizeris much wasted and is replaced when not overdue completely; a fixed connection-type assembly structure increases the difficulty of maintenance and debugging, maintenance or debugging needs to be executed in the case of use in a not large area in the box body, and the difficulty of maintenance and debugging is thus added; subsequent exponential fitting accuracy becomes low; and the errors are large after fitting happens when time delay changes are not small can be effectively avoided.

The invention relates to a planning method of a laser deposition scanning path. Three standards of radius, temperature and distance of a selected area are utilized to select a forming area for additive manufacturing, and the sequence of the forming area is controlled, so that an invalid stroke is avoided, heat input is reduced to the maximum, and the forming efficiency is improved. The scanning direction of a laser head is adjusted at 90 degrees for additive manufacturing, so that the bondability between layers is increased, and the quality of parts is increased.

The invention discloses a management system for a battery pack and a method thereof. Guiding channels II and a movable plate are arranged inside a box body and are used for placing a server; the server can move under the driving of the movable plate, and the movable plate can also be pulled out for operation, maintenance or debugging; in addition, an LED II is arranged on the upper part, is positioned in a vertical crossing channel and can move in the vertical crossing channel; the defects that in the prior art, the effect of charging temperature information transmission is poor, the real timeliness of the transmitted charging temperature information is insufficient, and the difficulty of maintenance and debugging is increased because of a fixedly-connected assembly structure and because maintenance or debugging must be performed in a small area in the box body, are effectively avoided.

The invention relates to a spot welding power supply output adjusting method, device and system and a storage medium. The method comprises the steps that current welding current and current welding voltage, collected in real time, of a welding head in a heat balance stage are processed, and current resistance of the welding head is obtained; the starting moment of the heat balance stage is the moment that the resistance change rate and the welding energy change rate of the welding head are both equal to zero; a reference feature value, the current resistance and preset technological parametersadopted when a spot welding power supply initially runs are processed, and to-be-adjusted voltage of the spot welding power supply is obtained; the reference feature value is obtained according to the preset technological parameters and welding current and welding voltage which are generated when the welding head is in the heat balance stage; and the output voltage of the spot welding power supply at the next welding moment is adjusted according to the to-be-adjusted voltage. According to the spot welding power supply output adjusting method, the output voltage of the spot welding power supply can be adjusted in real time according to the fed-back welding current and welding voltage, therefore, the heat accumulation phenomenon of the welding head is reduced, and the service life of the welding head is prolonged.

The invention provides an improved tread rubber material. The improved tread rubber material is prepared from the following raw materials in parts by weight: 50-90 parts of natural rubber, 10-50 parts of butadiene rubber, 1-3 parts of azodicarbonamide, 40-55 parts of tread reinforcing agent, 2-3 parts of anti-aging agent, 1-4 parts of vulcanizing activator, 1-4 parts of vulcanization accelerator, 0.1-0.45 parts of scorch retarder, 1-3 parts of vulcanizing agent and 1-2 parts of tread fracturing preventing agent. The invention further provides a preparation method of the improved tread rubber material. The method provided by the invention is a new method for improving tread rubber wearing resistance and reducing heat; by virtue of added azodicarbonamide, the interaction between rubber and carbon black can be improved, and the tread rubber has better wearing resistance and lower compression heat generation; meanwhile, the preparation method of the tread is simple in process and easy for industrialization.

The invention relates to a cooking pot and a preparation method thereof, belongs to the field of cooking pots, and aims to solve the problem that food is burnt and is difficult to clean due to poor heat-conducting property of an existing pot, and adopts the technical scheme as follows: the cooking pot comprises an iron matrix made of refined iron or cast iron; open fire cooking or electromagnetic cooking is facilitated; the heat conduction layer is tightly attached to the lower surface of the iron base body, and the heat conduction layer is a copper layer or a silver layer; the stainless layers are formed on the upper surface and the top surface of the iron base body; the bottom surface of the heat conduction layer is coated with the magnetic conduction layer; and the anti-corrosion layer covers the side surface of the heat conduction layer and the bottom surface of the magnetic conduction layer. The heat conduction layer made of copper or silver is good in heat conduction performance and arranged on the lower surface of the iron base body, heat can be quickly conducted to the whole iron base body, uniform heating is guaranteed, heat gathering is reduced, and the problem that food is burnt and stuck to the pan due to local heat gathering of the pan body can be effectively solved. The invention also discloses a preparation method of the cookware.

The invention provides a high-thermal-conductivity rubber material and a preparation method thereof, and solves the technical problems of poor heat resistance and aging resistance of the existing rubber material. The high-thermal-conductivity rubber material is prepared from the following raw materials by weight: 73.3-86.6 parts of rubber, 1-5 parts of masterbatch, 1.4-1.7 parts of stearic acid, 3.7-4.3 parts of zinc oxide, 2.2-2.6 parts of a vulcanizing agent, 36.6-43.3 parts of carbon black 330, 1.4-1.8 parts of an anti-aging agent, 51.3-60.6 parts of light calcium carbonate, and 22.7-26.9 parts of a plasticizer. The invention also provides a preparation method of the high-thermal-conductivity rubber material. The high-thermal-conductivity rubber material can be widely applied to the technical field of rubber products.

An embodiment of the invention relates to a circuit module and a manufacturing method thereof. The circuit module comprises a metal thin plate, an insulating adhesive layer and metal frames, wherein the insulating adhesive layer is arranged on the upper surface of the metal thin plate; recessions in predetermined shapes are formed in the insulating adhesive layer; the metal frames are arranged in the recessions and matched with the recessions in shapes; a plurality of circuit elements are fixed on the metal frames; at least one heat radiating block is fixed on each of part of the circuit elements; the protective layer and the metal thin plate form an enclosed space to seal the insulating adhesive layer, the metal frames, the plurality of circuit elements and the lower half portion of the at least one heat radiating block; the lower half portion refers to the portion between a contact surface of the radiating block and the corresponding circuit element and a surface, away from the metal thin plate, of the protective layer; a plurality of pins are arranged at preset positions of the edges of the metal frames; and one end of each pin is arranged inside the enclosed space and is electrically connected with the corresponding metal frame, and the other end is arranged outside the enclosed space. The circuit module and the manufacturing method thereof can reduce the occurrence possibility of short circuit, and can improve the radiating effect.

The invention discloses a high-thermal-conductivity bus bar and a forming method thereof, the high-thermal-conductivity bus bar structurally comprises two insulating sleeve openings and two silicone rubber strips, one silicone rubber strip is provided with two copper guide rails, the other silicone rubber strip is provided with two copper sliding grooves, the copper guide rails are arranged on the copper sliding grooves in a sliding mode, a safe distance is kept between the two silicone rubber strips, and the two silicone rubber strips are connected with the insulating sleeve openings. A heat conduction block is arranged in the insulation sleeve opening and enables the interior of the insulation sleeve opening to be divided into two fixing grooves, the length of the copper guide rail is equal to the length of the copper sliding groove and smaller than the length of the silicon rubber strip, and installation positions are kept between the end of the copper guide rail or the end of the copper sliding groove and the end of the silicon rubber strip. The length of the mounting position corresponds to the length of the heat conduction block, and when the end parts of the two silicon rubber strips are bonded in the fixing grooves one by one, the copper sliding grooves abut against the heat conduction block, so that the heat conduction performance of the conductive strip is improved.

The invention discloses a terminal base for an electric meter. The terminal base for the electric meter comprises a base body and an upper cover. A mutual inductor, a relay and a shunt are installed on all stations on the face of the base body respectively. A wiring board jack base with an inner slot is arranged on the face of the base body. A meter installation station is arranged on the back side of the base body, and a metering circuit template is installed on the back side of the base body. The metering circuit template is connected with a circuit function template on an external electric meter through the slot in the wiring board jack base by means of a PCB connection plate. Contact pins connected with a meter function template are fixedly installed on binding posts on the upper portion of the upper cover, and a fixing plate is installed at the position corresponding to the positions of the binding posts. The mutual inductor, the relay and the shunt on the base body are electrically connected with the circuit function template on the electric meter through the contact pins. According to the technical scheme, the terminal base for the electric meter is directly connected with a control unit through a wiring board in an inserted mode, the technology is simple, stability and firmness are achieved, use is safe, production cost is low, the problem of inaccurate measurement is solved, and the requirement for product quality is met.

The invention discloses a laser light source and a lighting device, the laser light source comprises a laser diode, a fluorescent sheet excited by the laser diode, a fixing plate for fixing the fluorescent sheet and fixing blocks, at least one fixing block is arranged on the fixing plate, the side edge of the fluorescent sheet is connected with the adjacent fixing block, and a heat-conducting medium is filled between the side edge of the fluorescent sheet and the adjacent fixing block. A light passing opening is formed in the fixing plate and covers the area, excited by the laser, of the fluorescent piece, and at least part of the area of the fluorescent piece abuts against the area, located on the edge of the light passing opening, of the fixing plate. According to the laser lighting device, the heat transfer distance is shortened through lateral heat conduction of the fluorescent piece, the heat transfer efficiency is improved, heat accumulation is reduced, the service life of the fluorescent piece is prolonged, and therefore the service life of the whole laser lighting device is prolonged. According to the laser lighting device, the heat transfer distance is shortened through lateral heat conduction of the fluorescent piece, the heat transfer efficiency is improved, heat accumulation is reduced, the service life of the fluorescent piece is prolonged, and therefore the service life of the whole laser lighting device is prolonged.

The present invention discloses a power transformer for a transformer substation. The power transformer comprises a transformer body, an open groove is formed in the side wall of the transformer body,and an opening and closing door is arranged at the open groove; a buckling groove is formed in the side wall of the opening and closing door, and the opening and closing door is rotationally connected with the inner wall of the open groove through two hinges; a water receiving plate is arranged above the transformer body, the lower end of the water receiving plate is fixedly communicated with twowater inlet pipes, device grooves and containing grooves are arranged in the opposite inner walls in the transformer body in a penetrating manner, and U-shaped water storage pipes are arranged in thetwo device grooves. The transformer is reasonable in structural design, and has the advantages of being capable of pre-processing the fire behaviors generated in the transformer body and giving an alarm in time.

The application provides a battery, including a battery cell, a first circuit board assembly and a second circuit board assembly. The electric core includes an electrode assembly, a casing for accommodating the electrode assembly, one or more first tabs, one or more second tabs with different polarities from the first tabs, and A third lug with a different polarity from the first lug. The housing includes a first surface and a second surface facing away from the first surface. The shell is a metal shell. The electrode assembly includes a first pole piece and a second pole piece. The first tab is electrically connected to the first pole piece and exposed to the first surface. The second tab is electrically connected to the second pole piece and exposed to the second surface. The third tab is electrically connected to the second pole piece and exposed to the first surface. The first circuit board assembly is electrically connected to the first tab and the third tab. The second circuit board assembly is electrically connected to the second tab. The present application also provides an electric device with the battery.

The invention provides an even-heating bathroom warmer and belongs to the field of household electric appliances. The even-heating bathroom warmer comprises a lamp bracket and high-heat bulbs. The lamp bracket comprises a reflecting panel. Relative to the ground, the higher center of the panel is inclined towards the lower periphery of the panel. The high-heat bulbs are evenly distributed on the inclined reflecting panel around the center of the reflecting panel. The even-heating bathroom warmer not only can effectively heat a bathroom, but also can greatly improve the problem of temperature difference in the bathroom when the bathroom warmer is used for heating.

The invention discloses a novel movable type energy storage device using superconductive tubes and copper foam phase-change materials. The novel movable type energy storage device using the superconductive tubes and the copper foam phase-change materials comprises a plurality of parallel single phase-change heat accumulators, wherein each single phase-change heat accumulator comprises a closed cylindrical shell; each shell comprises an outer sleeve, an inner metal sleeve and an interlayer; the interlayer of each shell is a cold water channel; a spiral guide ring is arranged in the interlayer of each shell; a superconductive tube is arranged in each shell; the upper end of each superconductive tube is sealed and inserted in the upper part of the inside of the corresponding shell; the lower end of each superconductive tube is open, is exposed outside the corresponding shell and is connected with a waste heat source; a phase-change material which is used for filling holes of copper foam is used for filling between the corresponding inner sleeve and the corresponding superconductive tube; the single phase-change heat accumulators are erected side by side; a water inlet of the upper end of each single phase-change heat accumulator is connected with a water inlet tube through a water collecting square tube; and a water outlet of the lower end of each single phase-change heat accumulator is connected with a water outlet tube through a three-way tube. The novel movable type energy storage device recycles the waste heat by the superconductive tubes, and is quick in heat transmission and high in heat conduction efficiency; and by the copper foam, the heat conduction coefficient of the phase-change materials is improved by the copper foam, and heat storage rate and heat release rate are increased.

A bi-directional conduction electric-heating tube comprises a metal outer tube, a metal inner tube, filler, a heating wire and a guide bar. The heating wire with the guide bar is disposed between the metal outer tube and the metal inner tube. The heating wire is fixed between the metal outer tube and the metal inner tube through the filler. The bi-directional conduction electric-heating tube has the advantages that electric heating efficiency is improved, and radiating area is also enlarged.