62 results about "Point heat source" patented technology

The invention discloses a multi-channel wick-embedded flat plate heat pipe, which consists of a high thermal conductivity substrate, wicks and working media, wherein the inner side of an upper surface of the substrate is provided with an upper narrow hollow cavity while the inner side of a lower surface of the substrate is provided with a lower narrow hollow cavity, communication channels are arranged between the upper narrow hollow cavity and the lower narrow hollow cavity and penetration channels are also arranged among the communication channels; the wicks are arranged on the surface of the lower narrow hollow cavity, the upper narrow hollow cavity, the communication channels and the penetration channels; and the working media are positioned in the upper narrow hollow cavity, the lower narrow hollow cavity the penetration channels and the communication channels inside the substrate. The multi-channel wick-embedded flat plate heat pipe not only greatly increases the effective heat exchange area for evaporation and condensation, but can also realize the rapid diffusion and spread of heat, generated by a plurality of local high heat flow point heat sources, towards large cooling surface, thereby achieving the purpose of enhancing temperature evenness at the heated surface and reducing the temperature on the surface of electronic equipment in order to further guarantee safe, stable and efficient operation of electronic equipment system.

The invention relates to an optical fibre fused tapering method using high-frequency pulse carbon dioxide laser as a heat source. The method precisely adjusts laser beams based on the good heat absorption performance of a silica optical fibre close to the carbon dioxide laser wavelength and the characteristics that the high-frequency carbon dioxide laser can generate a continuous high temperature, so that a fused tapered optical fibre is drawn while the laser beams heat up the optical fibre continuously along a certain optical fibre length. The method is mainly characterized by: designing a reasonable laser beam scanning track graph, and ensuring that the laser beams scan the optical fibre all the time during the whole drawing procedure and that a heat area stable enough can be generated on the optical fibre; and simultaneously adjusting the parameters of the carbon dioxide laser beams and the step length of a stepping motor, so as to ensure the heat and force balance of the optical fibre during the drawing procedure. The method does not pollute the optical fibre, and is not influenced by the indoor airflow, oxygen content and the like; and the heat source is similar to a point heat source, and the manufacture precision of the fused tapered optical fibre is greatly improved. The fused tapered optical fibre manufactured by the method can be widely used in the fields like beam splitting and connection of light, optical fibre sensing, optical filters, optical communications and the like; and the application potential is huge.

The invention relates to a laser thermal therapy probe based on a photothermal effect of an optical fiber material. The laser thermal therapy probe comprises a light transmission optical fiber, a protective sleeve, an optical fiber temperature sensor and a photothermal probe. The front end or the back end of the photothermal probe is connected with the optical fiber temperature sensor; the optical fiber temperature sensor on the back end is connected with the light transmission optical fiber; the protective sleeve wraps outside the light transmission optical fiber, the optical fiber temperature sensor and the photothermal probe. In a therapy process, the thermal therapy probe is put into a tissue requiring a treatment, the imported laser is converted into a thermal energy by the photothermal probe, and the thermal energy is conducted and radiated all around by centering on the probe, accordingly forming a certain temperature field distribution in the tissue. A complete distributed measurement of temperature distribution field temperature information around the tissue is achieved by the optical fiber temperature sensor. Being simple in structure, low in cost, small in size, and easy to manufacture, the laser thermal therapy probe based on the photothermal effect of the optical fiber material can measure the temperature distribution in real time, thereby providing a safe and highly practical probe structure as well as a small-size point heat source device with precise temperature control to the laser-induced interstitial thermal therapy.

The invention discloses a test device for research of temperature field distribution characteristics under a temperature-acceleration environment. The device comprises an environmental test box, an electric heating film, a power meter, a power supply, fans, a valve, a vacuum pump, a composite vacuum gauge, a test framework, a fixation bracket, point heat sources, temperature sensors, an aviation plug, and a data acquisition and power controller. The invention also discloses a test method for research of temperature field distribution characteristics under the temperature-acceleration environment, and the method consists of the steps of: starting a centrifuge; starting the point sources; controlling conduction heating of the electric heating film; when the temperature reaches balance, regulating the pressure in an environmental test box; when balance is reached again, acquiring the temperature field distribution the environmental test box again; and turning off the equipment to end the test. Through the device and the method provided by the invention, temperature field distribution characteristics under the action of a centrifugal field and under different conditions (internal heat source characteristics, pressure level, and air flow rate) can be acquired, and the product internal temperature field distribution under multipoint heat sources can be simulated.

The invention discloses an in-situ test method for high-pressure low-temperature heat conductivity coefficients and heat transfer coefficients. The heat conductivity coefficients and the heat transfer coefficients of media are measured based on a point heat source thermistor method. The power of a thermistor is determined, and the heat conductivity coefficient and the heat transfer coefficient of a measured medium are obtained according to the resistance feedback and temperature attenuation data of the thermistor by utilizing a calculation model. The method comprises the following steps: correcting parameters of a thermistor measurement model; slowly extruding a to-be-measured medium by utilizing a piston on the lower part of a reaction kettle, and unifying the standard of to-be-detected samples; introducing reactive gas and controlling the pressure and temperature in a target range; and inputting the determined power value into the thermistor by virtue of a power input control system, acquiring the resistance value and temperature value of the thermistor by utilizing a data acquisition device, and finally, obtaining the heat conductivity coefficient and the heat transfer coefficient by utilizing the calculation model. According to the design of the invention, in-situ synthesis of different media under high pressure and at low temperature can be met, and in-situ measurement of the heat conductivity coefficients and heat transfer coefficients of multi-phase condition substances in different spaces and different time is realized.

The invention discloses a method for establishing an energy coupling self-consistent model for laser penetration welding. Compared with the existing point heat source model, plane heat source model and volume heat source model, the laser penetration welding model established by the method can more actually reflect the transmission and conversion of energy in the laser penetration welding process and is closer to an actual weld joint. Meanwhile, the model is also the self-consistent model and can be well applied to numerical simulation for analyzing the distribution of a plasma temperature field and the density of the laser penetration welding.

The invention relates to a numerical value general solution method for a heat conduction heat source position recognition inverse problem. The numerical value general solution comprises the following steps that a heat conduction source position recognition inverse problem is described, the next step is directly executed if a heat conduction source is a point source, and if the heat conduction source is a non-point source, a conversion algorithm is adopted to convert the non-point source inverse problem into a point source inverse problem, and then the next step is executed; a homogeneous solution and a particular solution are calculated to construct a numerical value general solution; a system of linear equations is solved, and heat source position parameters are obtained. According to the method, the numerical value general solution meeting a heat conduction differential equation and using the heat source parameters as variables is constructed based on the finite element numerical solution, the heat conduction position recognition inverse problem is converted into a multivariate function extremum problem, and the heat source parameters are rapidly obtained through inversion. The method not only can inverse the point heat source position, but also can inverse the positions of heat sources in any shape, thereby being wide in application range, high in adaptability and good in engineering application prospect.

The invention relates to the technical field of heat conducting and heat dissipating devices and preparation methods and preparation devices thereof, and in particular relates to a holt-melting heat-conducting film, a heat-conducting liner including the hot-melting heat-conducting film and a preparation method and a preparation device thereof. The hot-melting heat-conducting film includes a heat conducting layer, wherein an adhesive layer is arranged on one surface of the heat conducting layer while a hot melt adhesive layer is arranged on the other surface of the heat conducting layer, a thin film layer is arranged on the adhesive layer, thus being simple in structure and good in heat conducting and heat dissipating effect; the heat conducting liner includes a hot-melting heat-conducting film and a support substrate, and contact point heat sources with a heat dissipating surface, thus improving heat dissipation efficiency; the preparation method comprises primarily forming, thermoforming, cooling for shaping and pulling and cutting to obtain finished products, so that the method is simple, production efficiency is improved, and production cost is reduced; the preparation device includes a control box, and a material rack, a primary forming mold, a thermoforming mold, a cooling shaping mold, an automatic puller, a counter and a cutting device sequentially arranged on an assembly line, one people can operated the whole assembly line, thus being saving in human and material resources.

The invention discloses an artificial graphite film heat conduction and heat dissipation material with a composite structure and a preparation method of the artificial graphite film heat conduction and heat dissipation material with the composite structure. The artificial graphite film heat conduction and heat dissipation material with the composite structure comprises a heat conduction layer A and a single-sided or double-sided heat dissipation layer B, wherein the heat dissipation layer is directly combined with the heat conduction layer or is combined with the heat conduction layer through combining a transition layer C; the composite structure of the heat dissipation material is an AB type, an ACB type, an ABA type, an ACBCA type or an ACBA type; the heat conduction layer has a relatively high heat conduction coefficient and a point heat source subjected to heat dissipation is dispersed into a surface heat source; and the heat dissipation layer has a relatively high black-body radiation coefficient and has relatively high absorption capacity on heat of the heat source and relatively high outward thermal radiation capacity. The preparation method of the artificial graphite film heat conduction and heat dissipation material with the composite structure comprises the following steps of (1) obtaining the heat conduction layer or a heat conduction layer precursor; (2) uniformly coating a single side or double sides of the heat conduction layer or the heat conduction layer precursor with heat dissipation layer slurry and drying to form the heat dissipation layer; and (3) carrying out calendaring to obtain the artificial graphite film heat conduction and heat dissipation material with the composite structure.

The invention discloses a heat source recognition device, an unmanned aerial vehicle and a heat source recognition method. The device comprises an infrared imaging unit which is used for obtaining aninfrared image of a heat source under a first focal length, a proportion calculation unit which is used for calculating the proportion of the heat source in the infrared image so as to determine the size of the heat source, a visible light imaging unit which is used for acquiring a visible light image of the heat source under a second focal length according to the size of the heat source and the distance information of the heat source, and a recognition unit which is used for judging whether the heat source is a fire point according to the visible light image. The heat source is discovered through infrared imaging, the visible light imaging unit further adjusts the focal length according to the size of the heat source so as to obtain the visible light image, and whether the heat source isa fire point is judged through the visible light image, so that interference of a non-fire-point heat source on infrared detection can be eliminated, and the problems of false alarm rate and high missing report rate are reduced.

The invention discloses an integral wall plate digitization forming technique based on a bending and moving point heat source composite technique; processed parameters are solved and optimized after the emulation processing course implemented in computer platform and specialist system; an integral wall plate is fixed on the surface of a caul or a block plate by a block device with a force sensor and is implemented heat process by point heat source; when the display value of the force sensor lowers to a certain extent; the loading of the point heat source is stopped; according to the processing requirement, the processing course can have one or a plurality of increment forming. The invention has the advantages of huge process accuracy, non-loss, simple and easy operation.

The invention discloses a control method for asymmetrical fillet weld joint melting form and melting depth. Melting forming of an asymmetrical fillet weld joint is controlled by adjusting the weldinggun angle, a front melting pool model is identified on the basis of a vision method, melting depth estimation and control are achieved, and due to the fact that the heat dissipation difference of twoside plates of an asymmetrical structure is large, melting forming of the two sides is difficult to control. The control method comprises the steps that on one hand, the melting pool form is controlled by controlling the welding gun angle, on the other hand, a finite-size fillet weld joint workpiece temperature field analytical model is derived on the basis of an instantaneous point heat source temperature field analytical equation of an infinite-body green function and a heat source equivalent method, melting pool edge feature points are obtained by means of image treatment to correct the analytical model, numerical calculation is conducted through the corrected analytical model, the maximum coordinate of the melting point temperature in the depth direction is solved, and then melting depth calculating and solving can be achieved. Through the method, control over melting forming of the asymmetrical fillet weld joint can be achieved, and the purpose of improving the welding quality ofthe special structure is achieved.

The invention discloses a multi-point triggered ternary lithium power battery module thermal runaway simulation and prediction method, which comprises the steps of establishing a power battery modulethree-dimensional model, and selecting a thermal runaway multi-point triggering position in a battery module; importing the three-dimensional model of the battery module into finite element software;establishing a battery heat production model for the battery pack according to the thermal abuse model, applying a thermal runaway trigger heat source Q to the selected multi-point trigger position battery, dividing a battery domain into quadrangle as a main free grid, and setting a heat exchange mode between batteries as convection and conduction and thermal runaway simulation to obtain battery module temperature, trigger point, heat source and thermal runaway time data; collecting the number n of different triggering points and the average value t of thermal runaway time caused by thermal runaway triggering of the heat source Q, calculating a relational expression between the time t and the thermal runaway heat source Q and the number n of the triggering points through fitting of a nonlinear least square method, and predicting the thermal runaway time of the battery module; and calculating the overall thermal runaway prediction relational expression of the battery module, and calculating the overall thermal runaway time of the module.

The invention relates to the technical field of testing of thermophysical parameters of materials, in particular to a method and system based on a laser point heat source to measure thermophysical parameters of a solid material. The system comprises a laser emitter, a vacuum box, a vacuum pump, a pressure meter and a data acquisition component; the pressure meter and the vacuum pump are mounted onthe lateral side of the vacuum box, the pressure meter includes a detection head and a meter head, the detection head is passed through the lateral side of the vacuum box into an inner cavity of thevacuum box, heat conductivity coefficient and heat diffusion rate of the solid material are measured via a parameter estimation method directly based on a constant-power boundary one-dimensional unsteady-state heat transfer model, and errors due to excessive simplification of a math model are avoided; in addition, for the case that estimation according to specific heat capacity parameters has lowsensitivity and has great errors, a strategy of estimating heat diffusion rate prior to correcting specific heat capacity estimated value is utilized, and heat conductivity coefficient, specific heatcapacity and heat diffusion rate of the material are accurately estimated at the same time.

The invention provides an energy storage type vapor chamber device. The energy storage type vapor chamber device comprises a phase change energy storage structure and a flat plate heat pipe, wherein the phase change energy storage structure is coupled with the flat plate heat pipe; metal foam (2) is adopted in the phase change energy storage structure; and the flat plate heat pipe comprises a capillary structure (4) and a steam cavity (5). The capillary structure is filled with a heat pipe working medium (6). The integrated technology of the flat plate heat pipe and the phase change energy storage material can be achieved, the temperature equalization capacity of the flat plate heat pipe and the energy storage function of the phase change material are both considered, the temperature impact of a periodic heat source can be reduced, temperature fluctuation can be effectively restrained, meanwhile the adaptability of the flat plate heat pipe to a distributed heat source can be improved,and temperature equalization capability of the flat plate heat pipe to a point heat source is improved.

The invention discloses a bending point heat source combined shaping method, comprising the steps of: 1). making simulated machining on blanks by computer platform and prejudging local region difficult to shape; 2).by step 1), obtaining point heat source machining parameters; 3). As machining, controlling point heat source for combined machining by computer control system according to the parameters in step 2); 4). during machining in step 3), blank state sensor feeds stress, strain and other real-time monitored data back to the control system. And it can overcome the defect of possibly damaging shaped pieces, even destroying them.

The invention discloses a method and a device for analyzing heat source intensity and temperature distribution in an organism based on a point heat source model. The device is composed of an infraredCCD detector, a data acquisition unit and a computer. According to the method and the device provided by the invention, on the basis of a Pennes bioheat conduction equation, an analytic solution of the Pennes equation is obtained through the point heat source model. An organism heat source can be composed of point heat sources which are uniformly distributed; the various point heat sources are subjected to independent heat conduction, so that temperature fields are defined; and a real temperature field is formed by superposing the temperature fields which are formed by the various point heat sources. Surface temperature distribution data of the organism is obtained by virtue of the infrared CCD detector, and based on the surface temperature distribution data, heat source intensity distribution information in the organism is obtained by virtue of a temperature fitting method, so that temperature distribution information in the organism is obtained. According to the heat source intensityand temperature distribution in the organism, functional information which is directly related to metabolism of the organism can be reflected; therefore, objective functional evidences are provided for bio-medical analysis.

The invention discloses a temperature response calculation method of a pile foundation spiral buried pipe under a condition of underground water seepage. The temperature response calculation method of a single pile foundation spiral buried pipe under a condition of three-dimensional underground water seepage according to a temperature response, generated by a point heat source, in an infinite uniform medium of underground water at a three-dimensional speed during flowing of the medium. When the underground water flows through a pile buried pipe group at the three-dimensional speed, the temperature response generated by any point in the underground medium at any time is superposition of effects of the underground water seepage and heat exchange of the pile buried pipe group, so that a calculation mode of the temperature response can be obtained. Furthermore, a backward reasoning and calculating method is used for setting ranges of the size and the direction of the flowing speed of the underground water in a process of obtaining the seepage speed of the underground water; values are continuously extracted from the ranges, and points are arranged around a drilled hole; a variance sum of calculated values and experimental values of all the points within a certain time phase is calculated; when the variance sum of most of the points is minimum, the size and the direction of the actual flow speed of the underground water are obtained.

The invention discloses a high-efficient radiating system applicable to multiple point heat sources in a small space, belonging to the technical field of aerospace thermal control. The system comprises a loop heat pipe capillary pump, a steam pipeline, a liquid pipeline, a condensation heat exchanger and flat evaporators, wherein the loop heat pipe capillary pump is heated by utilizing the heat of an active heater; a working medium in the loop heat pipe capillary pump is evaporated, and is transferred to the condensation heat exchanger for condensation through the steam pipeline; condensed liquid returns to the flat evaporators through the liquid pipeline, and is evaporated again after absorbing the heat of the point heat sources in the small space; the working medium returns to the condensation heat exchanger for condensation again; the working medium flows back to the loop heat pipe capillary pump after condensation to finish one time of cooling circulation; one or more cooling loops each consisting of the flat evaporators, the steam pipeline, the condensation heat exchanger and the liquid pipeline are connected in series between the condensation heat exchanger and the loop heat pipe capillary pump, so that heat carried by the system can be further increased. By adopting the high-efficient radiating system, high-efficient radiating in the small space can be realized.

The invention discloses a microgravity molecule heat-transferring heat conductor. The microgravity molecule heat-transferring heat conductor comprises a radiator. The radiator is provided with a heat absorbing surface and at least one heat dissipating surface. A vacuum sealed cavity is arranged in the radiator. Microgravity molecule heat-transferring media with the volume being smaller than that of the vacuum sealed cavity are arranged in the vacuum sealed cavity. The microgravity molecule heat-transferring media are gasified rapidly when encountering a heat source under the microgravity condition, the whole sealed space is filled with the microgravity molecule heat-transferring media, part of heat energy is converted into molecule movement kinetic energy rapidly, and thus part of the heat energy is consumed; meanwhile, constant temperature is formed in the whole space rapidly, almost no heat resistance exists in the space, and a point heat source is changed into a body heat source instantly. The microgravity molecule heat-transferring heat conductor has the beneficial effects that the problems of high-power heat dissipation and high-heating-flux heat conduction are solved completely, manufacturing is convenient, the weight is low, cost is low, the conductor can be in any shape and be installed freely, and burning explosion hidden dangers are avoided. The microgravity molecule heat-transferring heat conductor is used for manufacturing high-power LED radiators or high-heating-flux integrated circuit board radiators.

The invention discloses a point heat source temperature test method for non-direct contact. A measured piece is placed in the middle of an incubator, so that a thermal conductivity coefficient K has the same value at the same ambient temperature and the same surface temperature of the measured piece; further, when the difference between the surface temperature of the measured piece and the ambient temperature is the same, the thermal conductivity coefficient K has the same value; because the measured piece is a point heat source, when the temperature is stable, the ambient temperature will be in inverse proportion to a cube of the distance from the heat source under the effect of the heat source. Consequently, the test point of the ambient temperature is set at a position not close to the measured piece and not near the wall of the box. In test, when the ambient temperature inside the box and the temperature of the measured piece are stable, the surface temperature and heating power are recorded. Through the collected experimental data, the K is calculated through the above formula. Through the method, indirect measurement can be carried out, and the direct contact with the measured piece is not needed.

The invention discloses a measuring probe of soil thermal resistivity based on a point heat source method, which is in a spheroidal structure and is composed of a hollow metallic spherical shell, an insulated heat-conducting filler, an electric heating appliance and a temperature thermocouple, wherein the metallic spherical shell is provided with a round hole and a strip groove gap; the electric heating appliance is positioned at the center of the metallic ball; the temperature thermocouple probe is arranged in the strip groove gap of the surface of the metallic ball; the inside of the metallic spherical shell is filled with the insulated heat-conducting filler; the electric heating appliance is sealed and positioned through the insulated heat-conducting filler; and the temperature thermocouple probe and the metallic spherical shell are filled with insulation heat conducting filler silicon. The probe can be used for sampling measuring in a laboratory, can directly measure the soil thermal resistivity on site under the condition of not damaging the soil structure, is in particular suitable for the measurement of the soil thermal resistivity in the burying depth range of the facilities such as power cables, heat distribution pipelines and the like.

The invention belongs to the related technical field of connection of a bulk amorphous material and discloses a method for acquiring continuous heating translation of a bulk amorphous alloy. The method comprises the following steps: (1) using a laser point heat source to heat the bulk amorphous alloy to acquire a series of samples at different heating times and critical points of crystallization and decrystallization of the samples, thus acquiring a plurality of critical points; (2) acquiring the distance between the critical point and the corresponding laser point heat source through metallographic analysis, further simulating a thermal cycle curve of the critical point; (3) acquiring part of the continuous heating translation of the bulk amorphous alloy through a DSC (Differential Scanning Calorimetry) experiment, and further fitting with points of tangency of a plurality of thermal cycle curves and the continuous heating translation to obtain the continuous heating translation of the bulk amorphous alloy. The method can accurately acquire the continuous heating translation of the bulk amorphous alloy, guarantees the amorphous state of a welding joint, and is stronger in practicality.

The invention relates to an energy consumption balance calculation method for an oil-contaminated soil segmented thermal desorption treatment process and application thereof. The method comprises the following steps: by taking an indirect sectional thermal desorption treatment process of flue gas heat supply and multi-point heat source heat supply as an object, based on the property characteristics of oil-polluted soil, including soil moisture content, real boiling point curve of dirty oil and the like, carrying out heating energy consumption analysis of various phase states aiming at energy consumption main bodies, including moisture, dirty oil and soil, in a petroleum-polluted soil material; establishing an energy consumption balance model of a multi-section thermal desorption treatment process. The method can be used for guiding thermal desorption sectional heat supply temperature control process design and providing an energy consumption reference standard and a regulation and control target for thermal desorption treatment operation conditions, so that high-efficiency energy-saving consumption-reducing dirty oil soil standard treatment is realized.

The invention relates to a plane heat source, comprising a heating element and at least two electrodes which are arranged at intervals and electrically connected with the heating element, wherein the heating element comprises a substrate and a plurality of carbon nano tubes distributed in the substrate; the carbon nano tubes in the heating element form at least a self-supporting carbon nano tube structure; and the carbon nano tubes in the carbon nano tube structure are arranged out of order or arranged by preferred orientation along the same direction or arranged by preferred orientation along different directions. The plane heat source can be used for producing self-heating clothes, gloves or shoes, electric heaters, infrared therapy apparatuses, electric radiators and the like and has wide application range.

The invention relates to a lamp source heat-dissipating module for a street lamp and a heat sink thereof. The lamp source heat-dissipating module comprises the heat sink and a plurality of point heatsources; a plurality of main heat-conducting posts are upwards integrated on the top surface of a flat heat-conducting base plate to form the heat sink; the point heat sources are directly arranged onthe bottom surface of the heat-conducting base plate; and moreover, the point heat sources face the positions of the main heat-conducting posts of the opposite top surface. Consequently, the intenseheat of the middle of each point heat source can be quickly dissipated by the main heat-conducting posts; moreover, because the main heat-conducting posts are integrated with the heat-conducting baseplate, the thermal resistance of the joint in between is the lowest, and the heat of the point heat sources can be quickly transferred to the main heat-conducting posts above; and therefore, the heat-dissipating effect is enhanced.

The invention discloses a vapor chamber radiator. The radiator comprises a radiator main body, a liquid absorption core, radiating fins and a cold liquid working medium, the radiator main body comprises a vapor chamber shell and a vapor chamber cover plate, the vapor chamber cover plate is fixedly connected to the side surface of the vapor chamber shell, and the radiating fins are fixedly connected to the outer part of the radiator main body; and the cold liquid working medium and the liquid absorption core are arranged in the radiator main body. According to the vapor chamber plate radiator, the radiator is manufactured on the basis of the vapor chamber plate, so the problem that a traditional radiator is low in heat conduction coefficient is well solved; a substrate of a common profile radiator is replaced with a uniform temperature plate structure to improve the heat conduction performance of the substrate of the profile radiator, a single-point heat source relatively concentrated by diodes is rapidly conducted and distributed to the side surface of a substrate, and then the heat is dissipated in a natural heat dissipation mode of heat dissipation tooth pieces, so that the heat conductivity coefficient of the radiator in use is greatly improved, the overall structure is simple, and the radiator is relatively practical in use.

The invention provides a crystal growth furnace and a crystallization system, and relates to the field of furnace structures. The crystal growth furnace comprises a furnace body, a first crucible, a point heat source, a bottom heat insulation structure and heaters; the first crucible is arranged in the furnace body; the heaters are arranged outside the first crucible; the point heat source is arranged at the bottom center of the first crucible; and the bottom heat insulation structure sleeves the point heat source. The point heat source realizes concentrated heating of the center of the firstcrucible in order to ensure that a temperature difference between the center of a monocrystalline silicon rod and molten polycrystalline silicon is consistent with a temperature difference between thesurface of the monocrystalline silicon rod and molten polycrystalline silicon, so the crystallization speeds of the center and the surface of the monocrystalline silicon rod are the same, and the quality of the monocrystalline silicon rod is ensured.

A high-heat-flow short-time working platform phase change temperature control assembly fin structure design method includes the steps that firstly, design working conditions are defined, heat conduction channels are designed, the structural layout of the heat conduction channels is designed by simulating growth of plant leaf veins, and the heat conduction channels extend from a point heat source to the interior of a phase change material to form a heat conduction enhanced network; then material reconstruction is carried out, and heat conduction channel units are screened by adopting a competitive mechanism; mathematical optimization is performed on a heat conduction channel model, and iterative optimization is performed to obtain an optimal heat conduction structure meeting the material consumption by taking the minimum total heuristic dissipation of a heat conduction divergence grid structure as an optimization objective function and the volume dissipation of a high-heat-conduction material as a constraint condition; and finally, adaptive treatment is performed, and rounding the bifurcated layout of the heat conductivity improving structure according to the production process requirements, thereby obtaining the final layout of the heat conduction structure. The heat conductivity of the phase-change material is improved while the energy storage capacity of the phase-change material is guaranteed, heat transfer in the material is enhanced, and the phase-change material can better play a role in energy storage.

The invention discloses a method for enhancing bonding strength of a cold spraying coating and a base material, and relates to the technical field of material engineering. The method comprises the steps that scanning treatment is performed on the surface of the base material through a point heat source so that the hardness of the surface of the base material can be reduced till that no precipitated phase exists, and / or aging treatment is performed on the cold spraying powder; the second phase is separated out from the cold spraying powder so that the hardness of the cold spraying powder is improved; and finally, cold spraying is performed on the surface of the base material without the precipitated phase by using the common cold spraying powder, or cold spraying is performed on the surface of the base material by using the cold spraying powder with the second phase, or cold spraying is performed on the surface of the base material without the precipitated phase by using the cold spraying powder with the second phase. In this way, three schemes for enhancing the bonding strength of the cold spraying coating and the base material are achieved, and the purposes of improving the embedding depth when the powder particles impact the surface of the base material and improving the consistency of the plastic strain of the powder particles and the interface of the base material can be achieved.