745 results about "Insulation system" patented technology

The invention discloses an electromagnetic heating and heat preservation system for a wind power blade girder plate pultrusion die, and relates to the technical field of thermal field regulation and control, comprising the following steps: activating an electromagnetic coil array to generate an alternating magnetic field, synchronously starting a heat preservation layer device, and triggering a gradient heating mode when the temperature of the die reaches a preset threshold value; a mold temperature field is monitored in real time, the power of an electromagnetic coil and parameters of a heat preservation layer are dynamically adjusted, a target temperature gradient is established, an electromagnetic heating device and a mechanical traction device are linked in the pultrusion process, and heat dissipation control is triggered according to the material flowing state; and after heat dissipation control is completed, the main power source is cut off, the mode is switched to the waste heat recovery mode, mold waste heat is guided into the energy storage device, and the cooling rate is controlled. According to the method, accurate mode switching of electromagnetic heating from uniform temperature rise to gradient heating is achieved through cooperation of magnetic field activation and a gradient triggering mechanism, and the temperature gradient establishment speed and the morphological stability are effectively improved in cooperation with power regulation and control partition differentiation power instruction and thermal insulation layer parameter dynamic matching.

The invention provides an oil-paper insulation space charge measurement numerical simulation method considering a composite electric field working condition, and relates to the technical field of oil-paper insulation space charge measurement simulation, and the method comprises the steps: obtaining the actual operation environment parameters of a high-voltage transformer, and carrying out the multi-physical field coupling calculation of a fluid field, an electrostatic field and a temperature field of the high-voltage transformer; establishing a bipolar carrier transmission model, collecting structure parameters and attributes of oil paper insulation, and setting material parameters; setting boundary conditions of each physical field, and establishing a corresponding charge transport reaction equation; initializing an oil paper insulation system to configure related parameters of a solver, and calculating a charge transport reaction equation through the solver to obtain a simulation result; perfecting the simulation result to obtain a space charge measurement numerical simulation result of oil paper insulation; according to the invention, the limitation of field test conditions is overcome, the technical problem of low detection resolution of measurement equipment is solved, and the real-time performance of accurate observation of charge dynamic response is ensured.

The invention belongs to the technical field of insulation board detection, and particularly relates to an intelligent detection method and device for the bonding area ratio of an insulation board, and the method comprises the steps: collecting an infrared image of an external insulation system of a building external wall, determining a plurality of segmentation thresholds according to local regions with different sizes of pixel points, obtaining a temperature characteristic value according to the size relation between the pixel value of the pixel point and each segmentation threshold value, dividing the infrared image into a plurality of super-pixel blocks according to the pixel value and the temperature characteristic value, and calculating the temperature anomaly degree according to the number of all the super-pixel blocks contained in each heat insulation board and the concentration trend and difference of the pixel value. And determining the bonding strength of the target insulation board according to the position and area ratio of the target sub-block of which the sound velocity is within the sound velocity range of the bonding part and the bonding state is bonded in the target insulation board of which the temperature abnormal degree is greater than a preset threshold value, and judging whether the target insulation board is qualified by combining the vertical height. According to the invention, the accuracy of insulation board quality detection is improved.

The invention belongs to the technical field of submarine cables, and provides a high-voltage three-core submarine cable. Comprising a cable core, a waterproof layer, an inner sheath, an armor layer and an outer sheath, the cable core comprises at least one conductive core, the conductive core comprises a conductor and an insulation system arranged outside the conductor, the insulation system comprises a conductor shielding layer, an insulation layer and an insulation shielding layer, and the conductivity of the conductor shielding layer is gradually reduced from inside to outside in the radial direction of the conductive core; the conductivity of the insulation shielding layer is gradually reduced from outside to inside in the radial direction of the conductive core. The contact interface of the conductor shielding layer and the insulating layer prevents charge from gathering at the interface, and the electric field distribution between the conductor shielding layer and the insulating shielding layer is greatly optimized; similarly, the electric conductivity of the insulation shielding layer is set to be gradually increased in the direction away from the insulation layer, the interface electric field between the insulation layer and the insulation shielding layer is optimized, electric charges on the interface of the insulation layer can be rapidly led to the insulation shielding layer, and the partial discharge phenomenon is prevented.

The invention discloses a transformer dynamic diagnosis and early warning system based on sulfide deposition characteristics, and the system comprises a monitoring unit which is used for monitoring the deposition state of sulfide in a transformer in real time, and obtaining sulfide deposition characteristic parameters during the operation period of the transformer; the first diagnosis unit is used for judging whether the current sulfide deposition characteristic parameter affects the insulation system or not and obtaining a first diagnosis result; the second diagnosis unit is used for acquiring a second diagnosis result according to the propagation and attenuation characteristics of the electric signals, the thermal signals and the vibration signals under different turn-to-turn discharge positions, types and intensities; the fault diagnosis unit is used for judging whether the insulation defect and the turn-to-turn discharge phenomenon in the transformer reach the early warning level or not according to the first diagnosis result and the second diagnosis result; and the early warning unit is used for generating corresponding fault early warning information according to the current early warning level, and reminding a user or operation and maintenance personnel to take preventive maintenance or emergency treatment measures in real time.

The invention discloses a method for determining the critical safety diameter of an emulsion drop of a liquid energetic material synthesis reaction conveying pipeline, which comprises the following steps of: curing and heating a sampled emulsion, determining pyrolysis kinetic parameters of the detected emulsion, constructing a heat production and heat transfer heat insulation system model of a mixed solution of an acid ester emulsion and the emulsion drop by utilizing Comsol, and determining the critical safety diameter of the emulsion drop of the liquid energetic material synthesis reaction conveying pipeline. Calculating a temperature rise change rule of the mixed liquid heat insulation system under different emulsion droplet sizes, determining a function relationship between the emulsion droplet particle size and the temperature rise of the mixed liquid heat insulation system, and deriving to obtain the critical safety diameter of the emulsion droplet; the method comprises the following steps: adsorbing emulsified liquid by using a porous particle material, testing whether the emulsified liquid explodes due to collision and friction of emulsified liquid with different pore diameters at different rates in an impact tank-piston device to obtain the relationship among the movement rate of emulsified liquid drops, the particle size of the emulsified liquid drops and the explosion risk, and determining the explosion risk of the emulsified liquid drops under a specific conveying speed condition according to the relationship. The liquid energetic material is used for synthesizing the optimal size of emulsified liquid drops in a reaction mixed solution.

Disclosed is a physical simulation experiment system for vapor-liquid multiphase seepage in an underground gas storage facility in a depleted gas reservoir, including: a rock sample sealing, heating, and insulation system, a triaxial stress and confining pressure loading system, an oil-gas-water injection and pore pressure supply system, a vapor-liquid-solid three-phase separation and measurement system, an optical micro / nanofiber gas detection and monitoring system, a distributed fiber optic sensing system, and a gas supply and leakage alarm system, where the rock sample sealing, heating, and insulation system is used for accommodating and heating a rock sample; and the oil-gas-water injection and pore pressure supply system performs oil-gas-water injection into the rock sample and pore pressure maintenance. The present application aims to overcome the bottleneck problem of evaluating the dynamic sealing integrity of underground gas storage under alternating loads caused by injection and withdrawal.

The invention discloses a ventilation-sound insulation integrated ultrathin metasurface grating and a using method thereof. The grating is composed of a perforated cover plate, a bottom plate, a plurality of slender cavities with different lengths formed by separating the perforated cover plate and the bottom plate through wall plates, and a peripheral grid-shaped ventilation area. According to the grille, the excellent broadband sound insulation performance can be achieved on the premise that the high ventilation quantity is guaranteed through a thin layer structure with the thickness as low as about 20 mm. The folded labyrinth resonance sound absorption units with gradient lengths are arranged in the non-ventilation area, broadband continuous sound absorption peaks can be generated, and sound absorption replaces sound insulation, so that broadband sound attenuation performance is obtained. Compared with an existing ventilation and sound insulation grille, the grille structure is thinner, larger in ventilation area and wider in working frequency band, the wide engineering application value of the grille structure is shown, a light-weight and low-frequency broadband noise reduction solution is provided for mechanical equipment such as airplanes, warships, high-speed rails and automobiles, and the mechanical equipment can be widely applied to mechanical equipment such as the airplanes, the warships, the high-speed rails and the automobiles. And the method also has wide application prospects in ventilation and sound insulation systems in green buildings.

The invention belongs to the technical field of ship liquid cargo tanks, and discloses a liquid cargo tank heat insulation system and an installation method thereof. The liquid cargo tank heat insulation system comprises a filling mechanism, a fastening mechanism and a plurality of heat insulation blocks, the multiple heat insulation blocks are sequentially laid on a liquid cargo tank shell, each heat insulation block is in an I shape, a splicing gap between any two adjacent heat insulation blocks is in a shape like a Chinese character'zhong ', the splicing gaps are filled with the filling mechanism, and the fastening mechanism is arranged between the filling mechanism and the heat insulation blocks. A fastening mechanism penetrates through each heat insulation block, the bottoms of the fastening mechanisms are fixedly connected with the liquid cargo tank shell, the tops of the fastening mechanisms extend out of the heat insulation blocks, and the fastening mechanisms are configured to fasten the corresponding heat insulation blocks to the liquid cargo tank shell. According to the liquid cargo tank heat insulation system, the connecting stability of the heat insulation blocks on the liquid cargo tank shell is guaranteed, the heat insulation blocks are prevented from falling off from the liquid cargo tank shell, the filling stability of the filling mechanisms in the splicing gaps is also guaranteed, the filling mechanisms are prevented from falling off, the cost is low, and construction installation and repairing operation are convenient.

The invention provides a well wall heat insulation hollow microsphere and a preparation method thereof. A sealed vacuum cavity is formed in the well wall heat insulation hollow microsphere, a polymer layer is arranged on the surface of the well wall heat insulation hollow microsphere, the polymer layer is provided with cationic groups and anionic groups, and aerogel nano powder is embedded in the polymer layer. The invention also provides a preparation method of the well wall heat insulation hollow microsphere. The well wall heat insulation hollow microspheres have high compressive strength, and the heat conductivity coefficient is reduced; efficient well wall adsorption can be achieved through the synergistic effect of anion groups and cation groups, the defects that a traditional heat insulation material is prone to breaking, fast in heat conduction and ineffective in adsorption under the high-temperature and high-pressure environment of an ultra-deep well are overcome, and the material is suitable for an ultra-deep and ultra-deep oil and gas well drilling fluid system. A multistage pore heat insulation system is constructed through the zwitterionic polymer and the aerogel nano-powder, and a rough surface structure can be provided to assist the microspheres in adsorbing well wall rocks.

The invention discloses an insulation paper aging state evaluation method and device, equipment, a medium and a product, and relates to the technical field of insulation paper aging state evaluation. Carrying out terahertz time-domain spectroscopy test on the aged insulation paper sample to obtain a terahertz time-domain spectroscopy signal of the aged insulation paper sample; fourier transform is carried out on the terahertz time-domain spectral signal to obtain a terahertz frequency-domain absorption spectrum of the aged insulation paper sample, and optical parameters of the aged insulation paper sample in a terahertz frequency band are extracted; based on the Pearson's related absorption theory, using optical parameters to propose an aging characteristic quantity with absorption spectrum similarity as a characteristic, and calculating a similarity value between the aging sample insulation paper and a reference; and evaluating the aging condition of the to-be-tested insulation paper in the oil paper insulation system according to the similarity value. According to the invention, a new idea is provided for accurate and lossless evaluation of the aging state of the insulation paper in the oil paper insulation system.

The invention provides a quality detection system for a building external thermal insulation system. Hardware equipment of the system comprises a fan cover, a sealing frame, an air duct, a movable bracket, a control box and a fan, the fan cover is located on a to-be-detected wall surface, simulates an actual use environment, and directionally provides a wind load manually; the sealing frame is located between the fan cover and the wall face and seals the fan cover and the wall face. The air duct is located on one side of the fan cover and connected with the fan cover and the control box. The movable support is located below the air duct and used for supporting and adjusting the position of the air duct. The fan is connected with the control box and connected with the air duct through the control box to provide air pressure power. According to the building external thermal insulation system quality detection system and detection method provided by the invention, the control box, the high-power fan, the air duct pipe, the sliding bracket, the fan cover, the sealing frame and matched software are utilized to form a system, the wind load effect actually borne by a building external envelope structure is simulated, and a method closer to the actual use environment is adopted; and evaluating the bonding quality of the external thermal insulation system of the external envelope structure.

The utility model discloses a motor cooling structure and a motor, the motor cooling structure comprises a motor inner cylinder arranged between a motor outer cylinder and a stator iron core, the outer wall, facing the motor outer cylinder, of the motor inner cylinder is provided with a continuous spiral channel recessed towards the stator iron core, and the inner wall of the motor inner cylinder is attached to the outer wall of the stator iron core; the stator core realizes heat conduction through the motor inner cylinder and is used for heating the coolant in the spiral channel until the coolant is gasified; one end of the spiral channel is closed, the motor outer cylinder corresponding to the closed end of the spiral channel is provided with a coolant inlet, the other end of the spiral channel is open, and the motor inner cylinder corresponding to the open end of the spiral channel is provided with an exhaust hole for communicating the interior of the motor, so that the gasified coolant enters the motor. The motor stator iron core is used for heating the coolant to be gasified, and the gasified coolant enters the motor through the through holes, so that the problem that a low-temperature cooling medium is directly introduced into the motor to damage a coil insulation system in the motor is avoided.

The invention belongs to the technical field of power transformer monitoring, and particularly relates to a transformer state comprehensive prediction and evaluation method and system based on decision cascade fusion analysis and a storage medium. Analyzing the concentration of the characteristic gas dissolved in the oil in different operation states according to the oil sample, and calculating the generation rate of the characteristic gas; the concentration of the characteristic gas dissolved in the oil is introduced into various fault diagnosis methods based on analysis of the gas dissolved in the oil according to different decision-making means to evaluate and predict the state of the transformer; and fusing the discharge fault judgment result or the overheating fault judgment result with the concentration ratio of carbon monoxide to carbon dioxide in the oil sample, judging whether an insulation system involved in the transformer state is a pure oil insulation system or an oil paper insulation system, and completing fault classification of the transformer operation state. According to the invention, the operation state of the transformer is accurately predicted.

The invention belongs to insulation of superconducting power equipment, and particularly relates to a breakdown voltage prediction method for a liquid nitrogen, insulation barrier and bubble composite system. Comprising the following steps: acquiring electric field distribution characteristic parameters of the resistance type superconducting current limiter through simulation, and designing an equivalent electrode structure capable of reproducing electric field characteristics in a liquid nitrogen environment; establishing a first breakdown voltage prediction model taking the insulation barrier position parameters and the electrode spacing as variables; calculating the surface heat flux of the superconducting strip in the quench fault state; and introducing a bubble influence factor for correction to obtain a second breakdown voltage prediction model. A complex actual insulation system prediction problem is converted into an equivalent model problem which can be verified in a laboratory. And an accurate basis is provided for the insulation design of the resistance-type superconducting current limiter.

The invention discloses a high-precision voltage regulating system of a power frequency no-partial-discharge test transformer, and the system comprises a heterogeneous multi-stage power module which is formed by connecting an H-bridge unit group and a matrix converter in parallel, the H-bridge unit group outputs a fundamental voltage component, and the matrix converter compensates a high-frequency harmonic component; the multi-physics field digital twinning unit integrates an electromagnetic field solver, a thermodynamic model and a mechanical deformation simulation module and predicts the multi-physics field coupling state of the insulation system in real time; the dynamic impedance matching network comprises an adjustable inductor array and a digital capacitor bank, and automatically adjusts filtering parameters according to a load impedance measurement value; and the control module is used for deploying a deep learning model and is used for optimizing a modulation strategy and a protection threshold on line. According to the method, the voltage regulation precision and the waveform purity can be improved, the stability under the wide-range working condition is guaranteed, the breakdown hidden danger is recognized in advance through multi-physics field coupling simulation, and partial discharge development is restrained from the source.

The utility model discloses an ultra-low energy consumption external thermal insulation system of a VICP composite thermal insulation board thin plaster external wall for a building, which relates to the technical field of external thermal insulation systems of external walls and comprises a waterproof leveling layer, a cementing layer, a double-layer VICP composite thermal insulation board, a single-layer VICP composite thermal insulation board and a protective layer. The double-layer VICP composite insulation boards are adhered to the outer side of the waterproof leveling layer through the cementing layer, a heat bridge breaking anchor bolt is installed between every two adjacent double-layer VICP composite insulation boards of the base layer wall body, the cross section of each double-layer VICP composite insulation board is of a step-shaped structure, and each single-layer VICP composite insulation board is embedded in the step position of every two adjacent double-layer VICP composite insulation boards. The two VICP composite insulation boards are bonded to the outer sides of the heat bridge breaking anchor bolts through adhesives, and the protective layers are fixedly connected to the outer sides of the two VICP composite insulation boards. According to the utility model, the two kinds of VICP composite insulation boards are matched with the thermal bridge breaking anchor bolt, so that the thermal bridge effect caused by an anchor bolt hanging piece is avoided, and the requirements of high insulation property and ultra-low energy consumption are met.

The invention discloses a preparation method of anti-aging cellulose insulation paper, and belongs to the technical field of oil paper insulation for electrical equipment. The problems that in the prior art, the polymerization degree of cellulose insulation paper in an oil-paper insulation system is greatly reduced, so that aging is caused, the insulation performance is reduced, and the service life is shortened are solved. The preparation method comprises the following steps: firstly, pre-treating natural color softwood pulp, grinding the softwood pulp to different degrees, and mixing the softwood pulp; secondly, purifying the mixed paper pulp, screening out fine fibers, and replacing the screened-out fine fibers with aramid nanofibers to prepare mixed paper pulp containing the aramid nanofibers; adding the mixed paper pulp containing the aramid nanofibers into a sheet making machine, performing dehydration forming and drying to obtain raw paper, and performing calendaring to obtain the cellulose insulation paper. The aging resistance and the insulating property of the cellulose insulating paper are remarkably improved, and the performance requirements of the insulating paper for the ultra-high voltage transformer can be met.

The invention discloses a green and low-carbon constructed wetland thermal insulation system capable of realizing intelligent control. The system comprises a modular wetland unit, a hydroelectric generation module, a thermal insulation heating module, an intelligent control module and an energy storage and standby power supply module, the modularized wetland unit comprises a modularized shell as well as a plant covering layer, a water inlet layer, a wetland bed layer and a water outlet layer which are positioned in the shell and are sequentially arranged from top to bottom; the hydroelectric generation module is mounted on one side of the modularized wetland unit and comprises a water power module shell and a turbine pipeline type hydroelectric generator; electric energy output by the turbine pipeline type hydroelectric generator is supplied to the heat preservation heating module or stored in the energy storage and standby power supply module for standby application; the heat preservation heating module comprises a heat conduction layer arranged at the bottom of the modular shell and located below the water outlet layer, and an electric heating plate located below the heat conduction layer. The intelligent control module is used for analyzing the running state of the wetland in real time and dynamically optimizing the power generation and heating modes. The energy consumption can be reduced, and efficient and stable operation can be achieved.

The invention discloses a generator stator winding broadband off-line partial discharge test method and device, and relates to the technical field of generator partial discharge off-line tests.The generator stator winding broadband off-line partial discharge test method comprises the steps that a sampling interval is set according to a variable step size strategy and a variable period delay strategy, and an acquisition system is initialized; synchronously monitoring phase information of externally applied voltage-withstanding power frequency alternating current, starting timing, and timing according to a single-period sampling interval mechanism and a full-period sampling interval mechanism; acquiring partial discharge signals and performing synchronous extrusion wavelet transform by using a mother wavelet function to obtain signals of different frequency components; and restoring the extracted frequency band signal to a time domain, and drawing and outputting a partial discharge time domain and phase domain result graph. The generator stator winding broadband off-line partial discharge test method provided by the invention reflects the discharge condition of the high frequency band after the stator insulation system is aged. For the facts that a high-frequency signal channel is narrow and attenuation is fast, the device is suitable for on-site measurement of partial discharge of a large-scale synchronous generator set stator insulation system of 27kV and below.

The invention belongs to the technical field of coal mine fire prevention and extinguishing, and particularly provides a coal mine goaf fire simulation experiment device and method. Comprising an experiment table groove body, a working face channel, an air inlet way, an air return way, a ventilation system, a goaf groove body, a water bath heating and heat preservation system, a goaf temperature simulation system, a distributed temperature acquisition system, a goaf gas environment simulation system and a gas acquisition system. According to the invention, the inclination pitching angle, the coal rock porosity, the goaf ignition position, the internal gas components and the like of the goaf can be simulated according to the actual conditions of different working surfaces of each coal mine, and the evolutionary process of the spontaneous ignition accident of the goaf is realized. According to experimental data, development and change states of internal temperature, gas components and the like of the goaf of each coal mine can be determined, key fire prevention and control areas of the goaf in each period of coal mining are found out, early warning is performed in advance, and life and property safety of underground personnel is guaranteed.

The invention provides a design method of an anti-falling external wall thermal insulation structure, which belongs to the technical field of external wall thermal insulation design, and comprises the following steps: establishing an external wall thermal insulation system pasting index matrix, and quantifying the bonding performance of a material and a base layer; constructing a pasting stability matrix, and representing the influence of the environmental condition on the system stability; executing a simulation experiment, and calculating a stress distribution state; performing entity small test verification to obtain interface parameters; designing an application falling change function, and constructing a dynamic prediction model; calculating a falling probability matrix, and identifying a high-risk area; anchoring point arrangement is optimized, and the optimal position is determined; developing an interface enhancement layer to improve the strain adaptability; an optimal construction matrix is generated, and a complete anti-falling system is formed. Through systematic design and optimization, the technical problems that in the prior art, an external wall heat preservation system is insufficient in long-term stability and prone to falling off are solved, and the long-term stability of the heat preservation system is achieved.

The present invention provides a passive low-energy technology transformation building, which relates to the field of building energy conservation, including exterior walls, roofs, ground, floor slabs, indoor partition walls, pipes, door and window openings and passive exterior windows, characterized in that: the exterior walls are provided with an exterior wall internal insulation system, and the exterior wall internal insulation system includes exterior wall internal insulation nodes, exterior wall internal insulation system internal corner nodes, exterior wall internal insulation system external corner nodes, exterior wall and roof junction internal insulation system nodes, exterior wall and ground junction internal insulation system nodes, exterior wall and floor slab junction internal insulation system nodes, exterior wall and indoor partition wall junction internal insulation system nodes, pipelines passing through exterior wall openings, and door and window openings. Newly built houses and existing buildings can be transformed to meet the indoor environment requirements and building air tightness requirements of passive low-energy buildings.

The invention discloses a vacuum insulated panel keel heat preservation system adopting anchoring and bonding connection and a construction method thereof, relates to the technical field of wall body external heat preservation, and solves the problem that the heat preservation performance is reduced due to the fact that a heat bridge effect is easily caused by existence of gaps between panels and steel embedded parts in an existing vacuum insulated panel heat preservation wall body. The connecting structure comprises a plain concrete wallboard, a pre-embedded connecting sleeve assembly, a bonding layer, a vacuum insulated panel, an orthogonal keel unit assembly, a wrap angle connecting assembly and a plastering layer, wherein the plain concrete wallboard is connected with the vacuum insulated panel and the orthogonal keel unit assembly through the pre-embedded connecting sleeve assembly and the bonding layer; the vacuum insulated panel is located in a frame formed by mutual array connection of the orthogonal keel unit assemblies; the wrap angle connecting assemblies are connected to the corners of the orthogonal keel unit assemblies. The plastering layer is located on the outer side of the vacuum heat insulation plate and the orthogonal keel unit assembly. The keel units are made of GFRP materials, gaps between plates are isolated, the heat bridge effect is reduced, and the heat preservation performance of the whole wall is effectively improved.

The utility model discloses an assembly type green roof heat preservation system. The fabricated green roof heat preservation system comprises at least one prefabricated heat preservation module and a waterproof roll, each prefabricated heat preservation module comprises a plurality of heat preservation plates, every two adjacent heat preservation plates are connected together, the upper surfaces of the multiple heat preservation plates jointly form a water guide slope surface, and the waterproof roll is arranged on the water guide slope surface. The water guide slope faces the edge direction of the prefabricated heat preservation module and extends downwards in an inclined mode. And the waterproof coiled material is laid on the water guide slope surface. And on-site rapid construction and assembly are facilitated, and later maintenance is facilitated.

The invention provides a cold region tunnel portal air curtain heat preservation system utilizing geothermal energy, comprising: a geothermal energy heat extraction device, the geothermal energy heat extraction device comprises a heat extraction drill hole arranged in the middle section surrounding rock of a tunnel and a heat extraction pipe arranged in the heat extraction drill hole, and the heat extraction pipe is internally provided with a heat extraction medium; the arc-shaped air curtain unit is provided with air curtain machines which are uniformly arranged in the circumferential direction of the inner side of the tunnel portal lining; the ground source heat pump is used for providing heat energy for the air heating cavity by taking geothermal energy as a heat source; clean and green geothermal energy and the air curtain technology are combined to achieve long-term prevention of cold damage to the tunnel portal in the cold region, the geothermal energy is transferred to the tunnel portal, a hot air curtain wall is formed at the portal through the air curtain technology, cold energy outside the tunnel is prevented from being transferred into the tunnel, and safety and no influence on driving installation are achieved.

The invention provides a special-shaped conductor polypropylene insulation photoelectric composite cooling power cable, and relates to the technical field of special-shaped cables, the special-shaped conductor polypropylene insulation photoelectric composite cooling power cable comprises three wire cores which are circumferentially and uniformly arranged, each wire core comprises a special-shaped conductor, an insulation layer and a metal shielding layer from inside to outside in sequence, and temperature measurement optical fiber units are arranged in the centers of the inner sides of the three wire cores; a filling area, a buffer layer and a heat dissipation outer protective layer are sequentially coated on the outer sides of the three wire cores; a cooling channel tightly attached to every two adjacent wire cores is arranged between the two adjacent wire cores, and the cooling channel is covered with an inner reflecting cover. Through a special-shaped conductor pressing and splicing technology, the sectional area of the conductor is reduced while the electrical performance is ensured; recyclable polypropylene is adopted to replace a polyethylene insulation system, so that heat resistance, corrosion resistance and high mechanical strength are achieved; through combination of the optical fiber temperature measurement unit and a multi-stage heat dissipation structure with a built-in cooling channel / inner reflection cover / porous buffer layer / graphene protection layer, real-time monitoring and dynamic thermal regulation and control cooperative management of the temperature of the cable are realized.

The invention relates to the technical field of power supply control, and particularly discloses a control method of a high-power isolated power supply, which realizes full-life-cycle intelligent management of an isolated power supply oil paper insulation system by constructing a complete technical chain from dielectric loss factor monitoring to PDIV drift inversion and then to insulation life prediction and operation control. The insulation state on-line monitoring unit collects the key insulation performance index of the dielectric loss factor in real time, the aging degree and the performance change of the oil paper insulation medium in the operation process can be accurately reflected, and compared with a traditional off-line detection method, the real-time performance and the accuracy of monitoring are greatly improved. The operation parameters of the equipment can be dynamically adjusted according to the real-time evaluation result of the insulation state, sudden faults caused by insulation failure are effectively avoided, and the safety and reliability of operation of the equipment are remarkably improved.

A beverage container insulation system for beverage containers comprises a base and a corresponding top which is hingedly attached thereto. An attachment element on the top magnetically couples with an attachment element integrated on the base, permitting retention of the top out of the way of a user seeking to drink from a beverage container contained in the system. The system can be manufactured of pliable insulated foam or other materials.

The invention relates to the technical field of building seismic isolation, in particular to a seismic isolation system with a vertical stepped quasi-zero stiffness characteristic and a design method of the seismic isolation system. A building three-dimensional seismic isolation system with the vertical stepped quasi-zero stiffness characteristic comprises a horizontal seismic isolation support arranged on the top face of a lower buttress; the positive stiffness system comprises at least one vertical steel spring, and the two ends of the vertical steel spring are connected to the top face of the horizontal shock insulation support and the bottom face of the upper buttress correspondingly. The negative stiffness system comprises a variable-slope guide plate, a horizontal multi-layer annular spring and a supporting plate, the thickness of the variable-slope guide plate changes in the height direction of the variable-slope guide plate, one end of the horizontal multi-layer annular spring abuts against the variable-slope guide plate, the horizontal multi-layer annular spring is connected to the supporting plate, and the supporting plate is connected to the upper buttress; the horizontal multi-layer annular spring can be driven to move along the surface of the variable-slope guide plate by changing the distance between the upper buttress and the lower buttress, and the horizontal multi-layer annular spring moves along the surface of the variable-slope guide plate, so that the length of the horizontal multi-layer annular spring is changed, and then negative stiffness is provided.