212 results about "Flame spread" patented technology

The invention discloses an extruded and insulated flame-retardant power cable for on-line monitoring of rail transit, and relates to the technical field of power cables, serpentine springs are connected between two adjacent cavity frames and outside corresponding five conductors on the outer side, an outer plastic pipe is connected between two adjacent serpentine springs, the outer plastic pipe is filled with silicone fireproof adhesive, and the outer plastic pipe is connected with the outer side of the serpentine springs. According to the invention, through the cooperation of the cavity frame, the serpentine spring, the inner plastic pipe and the expanding and supporting strip, the outer side of the conductor is provided with a sufficient heat dissipation circulation gap, the heat dissipation speed of the cable is improved, and the inner parts of the outer plastic pipe and the inner plastic pipe are filled with silicone fireproof glue, so that the heat dissipation performance of the cable is improved. The silicone fireproof adhesive expands when meeting fire to form a compact fireproof layer which tightly wraps the outer side of the conductor, and the expanded fireproof layer can fill heat dissipation gaps among the conductors to prevent flame from spreading, so that the cable has good heat dissipation capability, and meanwhile, the flame retardant property of the cable is also ensured.

The invention discloses a low-smoke flame-retardant environment-friendly low-voltage power cable, and relates to the technical field of power cables, a plurality of thermal expansion flame-retardant strips are adhered to the inner side of a relay isolation sleeve at equal intervals, inner different buffer strips sleeve the inner sides of the plurality of thermal expansion flame-retardant strips, and corrugated metal outer guide sleeves are clamped to the inner sides of the plurality of inner different buffer strips; according to the cable, the problems that in the prior art, due to the fact that effective flame-retardant and heat-resistant components and oxygen and fire insulation components are not arranged in the cable, and a large amount of air is left in the cable, the cable is not prone to damage, and the cable is not prone to damage due to the fact that the cable is not internally provided with the effective flame-retardant and heat-resistant components and oxygen and fire insulation components are effectively solved. And through internal rapid self-extinguishing, the increase of the internal fire condition caused by flame spreading is reduced, the fire extinguishing speed of the cable is improved, and the situation that the overall body is greatly influenced when part of the cable is damaged due to insufficient fireproof and flame-retardant effects is reduced.

The invention belongs to the technical field of path planning, and particularly relates to an A * hybrid ant colony path planning method for simulating a flame spreading grid. Comprising the following steps: interactively setting a plurality of fire source positions in an obstacle environment of an initial static grid simulation map, and selecting a starting point; obtaining terrain analysis data and fuel model data of the map; calculating the spreading rate value of each basic grid, and constructing a conversion rule among a non-combustion state, a combustion state and a burnout state to simulate flame spreading; the map information is input into a function formed by nesting a simplified ant colony algorithm into a traditional A * algorithm, and the optimal path for the robot to go to a plurality of target points is planned; simulating the movement of the robot to dynamically present the optimal global path; the flame spreading model and the robot dynamic path planning model are input into a map function together, optimal path planning of the simulation robot in the dynamically changing flame spreading environment is achieved, and the environment and robot moving conditions are displayed in a basic grid map in real time. According to the invention, the optimal path planning for the robot to go to a plurality of target fire sources to implement the fire extinguishing activity under the obstacle and dynamic flame environment can be realized.

The invention discloses preparation of isotropic flame-retardant bacterial cellulose aerogel and fire early warning application of the isotropic flame-retardant bacterial cellulose aerogel, and belongs to the technical field of aerogel materials. The preparation method of the aerogel comprises the following steps: (1) adding phosphorus / nitrogen-containing bridged organosiloxane and tetraethyl orthosilicate into bacterial cellulose dispersion liquid in proportion, and then stirring to obtain milk white uniform and stable turbid liquid; and (2) heating and curing the milky white turbid liquid, then precooling, and finally freeze-drying to obtain the isotropic flame-retardant bacterial cellulose aerogel. The aerogel disclosed by the invention is a cellulose-based aerogel material with flame-retardant and heat-insulating properties, has a remarkable isotropic flame-retardant characteristic, can effectively resist flame spread in all directions, is high in carbonization efficiency, can realize early detection and early warning of a fire disaster, and has a great application prospect in the field of fire disaster early warning.

The invention discloses a building fire safety management and control method based on a digital twinborn technology, and the method comprises the steps: constructing sensor-middle platform-model bidirectional mapping, and reconstructing a dynamic scene through employing a neural radiation field technology; fusing the cross-domain desensitization data based on federal transfer learning, and constructing a building total-factor dynamic digital mirror image; through a spectrum analysis algorithm, a fire source is positioned in real time, and a flame spreading track is predicted; performing fire simulation in linkage with a total-factor dynamic digital mirror image, and optimizing a fire-fighting resource scheduling path through a multi-target particle swarm optimization algorithm; a multi-target rescue scheme is generated, an asynchronous block chain is used for evidence storage of a fire-fighting decision instruction, a rescue key area is plotted, and an optimal evacuation route is planned; and converging federal node data to quantify the data contribution degree, reproducing a historical fire behavior and deducing a new scene to carry out iterative optimization. According to the method, the problems of data sensing fragmentation, difficulty in cross-domain fusion, fire prediction lag, underscientific resource scheduling, slow drill scheme iteration and the like in traditional management and control are solved.

The invention relates to the technical field of material compositing, and discloses a polyurethane composite insulation board with a good flame retardant effect, which comprises the steps of fireproof surface layer pretreatment, flame retardant core layer preparation, reinforced substrate layer treatment, lamination molding and post-treatment, by designing a unique three-layer composite structure and adopting a multi-component synergistic flame retardant system, the flame retardant effect is good, and the flame retardant effect is good. The heat insulation board can form a multi-stage flame-retardant barrier when encountering high temperature and open fire, the flame spreading speed is slowed down, the overall fireproof safety of the material is improved, and the durability and stability of the flame-retardant effect are enhanced through the synergistic effect of all the functional layers; through surface modification treatment on the functional reinforcing phase, the interface bonding force between the functional reinforcing phase and a polyurethane matrix is improved, so that the flame retardant and the reinforcing phase are uniformly dispersed in the matrix, and the performance defect caused by agglomeration is avoided, thereby enhancing the mechanical strength and structural integrity of the material while keeping excellent thermal insulation performance.

The invention relates to a cable tunnel bridge fire prediction method and device, electronic equipment and a storage medium. The cable tunnel bridge fire hazard prediction method comprises the following steps: establishing a cable tunnel bridge fire hazard numerical simulation model, establishing a cable tunnel bridge fire hazard simulation model based on FDS software, obtaining key parameters such as heat release rate, temperature distribution and flame spread boundary under different working conditions, and constructing a multi-time sequence sample data set; performing state discretization on continuous variables such as temperature and a spreading range, and estimating a node prior probability in combination with a statistical frequency; constructing a dynamic Bayesian network topological structure according to a causal relationship among a heat source, temperature and spread, and setting a cross-time slice node dependence path to realize time sequence modeling; inputting a training sample and performing parameter learning to generate a conditional probability table; in the prediction stage, multi-step reasoning is achieved through forward propagation, flame spreading range probability distribution and interval estimation of multiple time steps in the future are obtained, and the specific position where the flame arrives is predicted.

The invention discloses an insulated high-voltage-resistant flame-retardant 10kV power cable, and relates to the technical field of power cables, a plurality of heat insulation protection sheets are arranged at the side ends of dense power transmission line cores, an elastic resistance sheath is mounted at the outer side ends of the heat insulation protection sheets, and a plurality of material storage thermosetting cavities are formed in the inner side of the elastic resistance sheath at equal intervals; according to the invention, through internal sealing press fit and oxygen uptake dehydration treatment, stable isolation of the battery cell is realized, the problem of internal short circuit or fire caused by discharging of the battery cell is reduced, and the reliability of the battery cell is improved. And through mutual cooperation of double-layer active flame-retardant fire extinguishing and double-layer passive flame-retardant arranged outside, the time for the cable to become a combustible material during combustion is slowed down, so that the flame spreading speed is slowed down, the fire extinguishing time is prolonged, the direct loss of the cable can be reduced when a fire breaks out, and the flame-retardant and internal insulation flame-retardant protection effects are improved.

The invention relates to the technical field of automobile battery fire prevention, and mainly discloses an anti-spontaneous combustion fire-retardant battery which comprises a battery shell, a plurality of battery packs are arranged in the battery shell, a plurality of pressure relief holes are further formed in the battery shell, and fire barriers are further arranged on the pressure relief holes; the flame arrester comprises a plurality of layers of barrier covers, a flame arresting disc is further arranged at the joint of the barrier covers and the pressure relief hole, and a flame arresting seam is formed in the flame arresting disc; wherein the barrier covers are provided with a plurality of flow-through hole layers in the flow measuring direction of the combustion medium, the flow-through hole layers in every two adjacent barrier covers are arranged in a staggered manner, and the flow-through hole layers and the fire-retardant seams are communicated with the inner space and the outer space of the battery shell, and the technology that after thermal failure of the battery, safe pressure relief can be achieved, and flames can be prevented from spreading outwards can be achieved.

The invention discloses a preparation method of an active fire extinguishing microcapsule, and particularly relates to a fire extinguishing technology, the preparation method comprises the following steps: mixing a first monomer, a second monomer and a fluorinated acrylate monomer, adding an initiator, uniformly mixing, heating and polymerizing to obtain a shell material, dissolving the shell material in an organic solvent to obtain a solution, adding an emulsifier and perfluorohexanone at a low temperature, stirring to obtain an emulsion, and drying to obtain the active fire extinguishing microcapsule. Adding a surfactant aqueous solution into the emulsion, continuously stirring after low-temperature high-speed stirring to obtain a three-phase suspension, heating, standing, collecting and drying to obtain an active fire extinguishing microcapsule finished product. According to the preparation method of the active fire extinguishing microcapsule disclosed by the invention, the active fire extinguishing microcapsule has an efficient active fire extinguishing function, and when encountering high temperature, the microcapsule can be broken to quickly release an efficient fire extinguishing core material perfluorohexanone contained in the microcapsule, so that flame spreading is directly inhibited at the initial stage of a fire; the perfluorohexanone is used as an efficient fire extinguishing agent, the usage amount is small, and pollution to the environment is reduced.

The invention relates to the technical field of nozzle fire extinguishing, in particular to an electric bicycle shed fire suppression system which comprises a temperature monitoring module, a fire source recognition module, a flame capturing module, a water spraying control module and a range adjusting module. According to the method, the temperature rise position is screened through synchronous temperature and position data, identification and marking are carried out in combination with a parking area and a charging area range, the risk of missing report of a fire source is avoided, flame continuous coordinates are recorded, a moving value is calculated to capture a flame deviation trend, and a deviation result and a nozzle coverage range are subjected to correlation judgment; water spraying control is only carried out in the coverage range and when the fire source deviates, dynamic association of coverage and the fire source is achieved by calculating the intersection area of the spraying range and the fire source range, the spraying angle is adjusted to complement the blind area when the area is insufficient, dynamic synchronization of the water spraying coverage range and the fire source state is formed, and the positioning accuracy and the response speed are improved. The local cooling capacity in fire treatment of the electric vehicle shed is enhanced, the flame spreading risk is reduced, and water sources are saved.

The invention discloses a halogen-free low-smoke flame-retardant polyolefin cable which comprises a composite cable core, a first flame-retardant wrapping tape layer, an inner sheath, a second flame-retardant wrapping tape layer, a waterproof layer, a metal sheath layer and an outer sheath which are sequentially arranged from inside to outside. The outer sheath is made of a ceramic polyolefin material which is extruded and covered on the metal sheath layer. According to the low-smoke halogen-free cable, the ceramic polyolefin outer sheath is introduced into the cable structure, so that the problems of sheath softening, insulating layer stripping, structure collapse and the like of a traditional low-smoke halogen-free cable during high-temperature combustion are effectively solved. The ceramic polyolefin material can be converted into a compact ceramic layer under the action of flame to form a firm heat insulation barrier, so that the integral structure of the cable is kept complete, flame spreading and conductor short circuit are prevented, and the fire resistance and continuous power supply performance are remarkably improved.

The invention relates to a new energy automobile cable material and a preparation method thereof, and belongs to the technical field of automobile cables. The new energy automobile cable outer sheath material is obtained by preparing the modifier, blending the modifier and polyethylene, carrying out melt extrusion and then carrying out irradiation crosslinking, when an outer sheath is combusted, halogen-free flame retardance is realized through phosphorus-silicon synergism, flame spreading can be delayed when a new energy automobile cable is on fire, and the flame retardance of the new energy automobile cable is greatly improved, so that the service life of the new energy automobile cable is prolonged, and the service life of the new energy automobile cable is prolonged. The phosphate ester structure can be coordinated with copper ions on the surface of the shielding layer, the bonding capacity of the shielding layer and the polyethylene sheath is improved, permeation of moisture and oxygen is reduced, and chemical corrosion is inhibited, so that long-term stability of the shielding effectiveness of the new energy cable is ensured; by improving the crosslinking density and the compatibility of the base material, the mechanical property and the heat resistance of the cable outer sheath are enhanced.

This invention discloses a flame-retardant silicone rubber for cables and its preparation method, belonging to the field of cable material technology. By copolymerizing methyl vinyl silicone rubber with flame-retardant modified spiky hollow microspheres, the flame-retardant modified spiky hollow microspheres can be fixed in the silicone rubber network. The flame-retardant modified spiky hollow microspheres themselves are inorganic high-temperature resistant ceramic materials. The hollow structure can form a physical heat insulation and oxygen barrier layer, blocking heat transfer and oxygen penetration, and delaying the thermal decomposition of the matrix. The grafted phosphorus-based flame-retardant groups and the nitrogen element of 4-aminobenzoic acid form a phosphorus-nitrogen synergistic chemical flame retardant. During combustion, a dense carbon layer is quickly generated, which inhibits flame spread, reduces heat release rate, and has excellent smoke suppression and toxicity reduction effects, meeting the stringent requirements for cable fire safety.

The utility model relates to the technical field of insulation board, and disclose a double -faced composite fireproof renewable insulation board, including the board body, the board body is sequentially provided with the heat preservation layer from inside to outside. The double -faced composite fireproof renewable insulation board, when the high temperature or open fire appears outside, the first fireproof layer and the second fireproof layer of both sides give priority to play the fire -resistant barrier effect, rely on material high -temperature -resistant, non -combustion characteristics, block flame spread and high -temperature transmission, the heat insulation layer in the middle, with the help of the closed bubble structure evenly distributed inside, reduce air convection and heat conduction, realize heat barrier, maintain the temperature difference of both sides of the board body to reach the heat preservation effect, the reinforcing layer is connected closely with the heat preservation layer and the second fireproof layer through epoxy resin adhesive, both strengthen the bonding strength of each layer, prevent interlayer peeling, and improve the overall structural stability of the board body, avoid its deformation, cracking when stressed or temperature changes.

The invention relates to the technical field of fire fighting equipment, in particular to a multi-degree-of-freedom elevating jet mechanical arm and a fire scene thermal radiation self-adaptive obstacle avoidance method thereof, and the method comprises the steps of monitoring the joint temperature of the mechanical arm in real time, generating a thermal radiation intensity map, predicting a thermal radiation acceleration area, analyzing thermal radiation deviation data and adjusting the posture of the mechanical arm. The problems of flame diffusion, structural deformation and the like are recognized by constructing a thermal radiation anomaly analysis system, and overheating risk prevention and intelligent evaluation are achieved. According to the method, the thermal radiation acceleration area can be preferentially monitored, misjudgment is prevented, the abnormality diagnosis efficiency and the equipment safety are improved, meanwhile, the maintenance cost is reduced, reliable operation of the mechanical arm in the high-temperature environment is ensured, and remarkable economic benefits are brought.

The invention relates to a construction waste crushing bin dust explosion suppression device which comprises a crushing bin body, a control panel arranged in the center of the front end face of the crushing bin body, an upper cover arranged in the center of the upper end face of the crushing bin body, a feeding hopper arranged in the center of the upper end face of the upper cover, and a pressure relief structure arranged on the upper portion of the center of one side wall of the crushing bin body. An explosion suppression spraying structure is arranged on the lower portion of the center of one side wall of the crushing bin body, an explosion suppression structure is arranged on one side wall of the crushing bin body at the upper end of the explosion suppression spraying structure, and a detection structure is arranged in the center of the interior of the crushing bin body. The explosion suppression device has the beneficial effects that when explosion danger occurs, high-pressure gas and part of dust can be quickly discharged through the pressure relief structure to reduce the pressure in the bin, explosion suppression powder is released through the explosion suppression structure to suppress the combustion reaction after flames are detected, and the explosion suppression spraying structure adsorbs dust, reduces the temperature and inhibits flame spreading by spraying water mist; and the explosion suppression effect and the safety are improved.

The utility model belongs to the technical field of seat, disclose a kind of multilayer fire -retardant noise absorption seat backplate, including backplate body, the backplate body is made of five layers structure composite, the backplate body includes abrasion -resistant fire -retardant surface layer, perforated sound-absorbing layer, soundproof layer, damping layer and support backplate that are sequentially arranged, each layer is integrally formed by hot pressing, the abrasion -resistant fire -retardant surface layer is located outermost layer.The utility model can effectively block external fire source and delay flame spread by abrasion -resistant fire -retardant surface layer, perforated sound-absorbing layer and soundproof layer can efficiently absorb medium-high frequency noise by micro-perforation resonance and porous sound-absorbing, and damping layer further inhibits structural vibration energy transmission, solve the problem that traditional seat backplate is insufficient in fire -retardant and single in noise absorption means.

The utility model discloses a wear-resistant flame-retardant curtain which comprises a curtain body and a mounting frame, and the curtain body comprises an inner flame-retardant fabric layer and an outer gold stamping layer which are attached to each other; the curtain body is fixedly connected to the mounting frame through the mounting rings; the mounting frame is composed of a first mounting groove and a second mounting groove; an inserting groove is formed in one side of the second mounting groove, and the upper end of the first mounting groove is inserted into the inserting groove to be connected with the second mounting groove. Preferably, the first mounting groove is provided with a first limiting strip; and the second mounting plate is provided with a second limiting strip. The flame-retardant curtain has excellent flame retardance and wear resistance, can be used for covering an initial fire source, blocking flame spreading and preventing flames from making contact with inflammables, and therefore the fireproof and flame-retardant performance of the curtain fabric can be effectively improved; the installation frame can not only keep the curtain not to fall off in the normal use process, but also can grasp the curtain and forcibly pull the curtain forwards to enable the curtain to fall off when an emergency fire occurs, so that the curtain is used for extinguishing the fire.

The utility model discloses a composite stainless steel plate frame which comprises a support assembly, a fixing assembly is fixedly connected to one side wall of the support assembly, the support assembly comprises an outer frame support assembly and a partition assembly, and a first middle layer plate and a pair of first flame blocking layers are arranged in the partition assembly. A flame-retardant layer, a second middle layer plate and a second flame blocking layer are arranged in the outer frame support assembly, the outer frame support assembly comprises side plates, a rear plate and a top plate, and a plurality of sets of first trapezoidal grooves are formed in the side walls of the pair of first flame blocking layers. The fireworks and crackers are shielded through the support assembly, and when explosion occurs, flames generated by the fireworks firstly reach the flame blocking layer of the support assembly, so that the flames are prevented from splashing all around and spreading; when the explosion intensity is high, fire extinguishing fibers fall into the middle layer plate to block flames; and finally, the fire is intercepted by the outermost flame-retardant layer, so that the external environment is prevented from being damaged by explosion of the fireworks.

This invention belongs to the field of phase change material technology, specifically relating to a flame-retardant composite phase change material, its preparation method, and its application. This invention provides a flame-retardant composite phase change material, comprising a phase change material, a polymer, a thermally conductive agent, and a flame retardant; the flame retardant includes a hydrated inorganic salt. The flame-retardant composite phase change material provided by this invention can undergo reversible cyclic heat absorption at 40~55℃ (i.e., thermal management and temperature control of the battery under normal operating conditions). Furthermore, it can absorb a large amount of heat generated by the battery before thermal runaway occurs, i.e., it can absorb a large amount of heat in the temperature range of 70~200℃, extending the time the battery is in the second stage of thermal runaway. Moreover, after thermal runaway occurs, this product, due to its high flame retardancy, can also prevent the spread of flames, thereby reducing the safety risks after thermal runaway.

The present invention provides a concrete-based energy storage box, provided with a tray-shaped housing and a cover plate. The cover plate covers the tray-shaped housing to form a sealed energy storage cavity, and the tray-shaped housing and the cover plate both are made of a concrete composite material. The energy storage box is formed into an independent and enclosed space by means of the tray-shaped housing and the cover plate that are made of the concrete composite material, such that a high temperature caused by battery thermal runaway within a single energy storage box can be effectively confined within the energy storage box. In addition, since the energy storage box made of the concrete composite material has high compressive strength and a long fire resistance duration, fire extinguishing agent supply branch pipes can be flexibly configured inside the energy storage box, such that in the event of a battery fire caused by severe thermal runaway, sufficient time can be provided for the fire extinguishing agent supply branch pipes arranged in the energy storage box to deliver a liquid extinguishing agent, thereby promptly and effectively extinguishing the flames inside the energy storage box, and preventing the flames from spreading and affecting other energy storage boxes in an energy storage device.

The invention discloses a laser cutting device for hollow oxford fabric production, and relates to the technical field of laser machining, the laser cutting device comprises a machining base, side sliding grooves are formed in the inner walls of the two sides of the machining base, driving guide rails are fixedly connected to the inner walls of the side sliding grooves, and driving sliding blocks are slidably connected to the interiors of the two driving guide rails; a transverse sliding rail is fixedly connected between the two driving sliding blocks, a cutting mechanism is slidably connected to the surface of the transverse sliding rail, it is ensured that the surface of the coating roller is always covered with a layer of uniform liquid film with the consistent thickness by automatically and continuously supplementing a flame retardant, and therefore stable and controllable quantitative coating can be achieved when the coating roller makes contact with oxford cloth; the problem that a coating is easily dried up in traditional intermittent coating is solved, flame spreading and smoke generation are effectively restrained, the risks of yellow edges and burrs are remarkably reduced, the manual maintenance process is simplified, and the stability and consistency of the coating effect during long-time continuous production are guaranteed.

The embodiment of the utility model provides railway vehicle-mounted automatic fire extinguishing equipment, and relates to the field of fire extinguishing equipment. A partition plate is mounted in an inner cavity of the equipment housing, and the partition plate divides the inner cavity of the equipment housing into a first chamber and a second chamber; a mounting frame, a fixing rod, a plurality of spraying assemblies, a plurality of first gears and a driving assembly are mounted in an inner cavity of the second cavity, the mounting frame is mounted on the lower surface of the partition plate through the fixing rod, and the spraying assemblies are mounted on the mounting frame; the multiple first gears are installed on the multiple spraying assemblies correspondingly, and the driving assembly is installed in the second cavity. In actual use, fire can be extinguished quickly, combustible materials near a fire source can be cooled preferentially, flame spreading is effectively prevented, meanwhile, the covering range of fire extinguishing materials can be gradually reduced, direct covering of the combustible materials is avoided, and flame deviation is prevented.

The invention discloses a high-heat-resistant communication equipment cable which comprises a conductor layer, an insulating layer, a shielding layer, a heat-resistant buffer layer, a flame-retardant heat-insulating layer, an anti-ultraviolet weather-resistant layer, a sheath inner protective layer and an outer sheath which are sequentially arranged from inside to outside. The heat-resistant buffer layer comprises a mica wrapping tape, an organic silicon gel layer and an aramid fiber woven wrapping sleeve which are sequentially arranged from inside to outside, the surface of the mica wrapping tape is coated with the organic silicon gel layer in an infiltrating mode, and the organic silicon gel layer is coated with the aramid fiber woven wrapping sleeve. Through the anti-ultraviolet weather-proof layer, ultraviolet radiation and thermo-oxidative aging can be effectively resisted to prevent molecular chain breakage, and the problem that a traditional communication cable is prone to cracking due to long-term exposure in an outdoor environment is solved. Through the flame-retardant thermal insulation layer, the effects of inhibiting flame spreading, reducing smoke release and maintaining the stable flame-retardant performance are achieved, and the problem that the flame-retardant performance degradation of the material in a high-temperature environment is difficult to meet the flame-retardant grade requirement of a laying place is solved.

The utility model relates to the field of kitchen utensils, and particularly discloses a burner and a stove. The combustor comprises an outer ring fire cover; the outer ring fire cover sequentially comprises an upper ring, a middle ring and a lower ring; a first fire outlet circular seam is formed between the upper ring and the middle ring, a second fire outlet circular seam is formed between the middle ring and the lower ring, and a groove extending in the radial direction of the outer ring fire cover is formed in the surface, opposite to the middle ring, of the upper ring. A groove extending in the radial direction of an outer ring fire cover is formed in the upper side wall of a first fire outlet circular seam of the combustor, namely the surface, opposite to a middle ring, of an upper ring, when airflow flows out of the bottom of the first fire outlet circular seam, part of airflow flows out of the groove, and under the guiding effect of the groove, the airflow obtains the stable speed and direction; and the unstable state of airflow of the annular air outlet is reduced, the large-flow and low-resistance effects of the annular seam under the flow can be guaranteed, and meanwhile stable airflow can be generated. And flames spread stably in the combustion process.

This invention relates to a new energy vehicle cable material and its preparation method, belonging to the field of automotive cable technology. The invention involves preparing a modifier, then blending the modifier with polyethylene, melt-extruding it, and subsequently subjecting it to radiation crosslinking to obtain a new energy vehicle cable outer sheath material. During combustion, the outer sheath of this invention achieves halogen-free flame retardancy through phosphorus-silicon synergy, delaying the spread of flames when the new energy vehicle cable is exposed to fire. Furthermore, the phosphate ester structure can coordinate with copper ions on the shielding layer surface, improving the bonding ability between the shielding layer and the polyethylene sheath, reducing the penetration of moisture and oxygen, and inhibiting chemical corrosion, thereby ensuring the long-term stability of the shielding performance of the new energy cable. In addition, the multiple double bonds and siloxanes in the modifier enhance the mechanical and heat resistance properties of the cable outer sheath by increasing the crosslinking density and substrate compatibility.

An uninsulated flexible duct includes a core made of a polymer material and including a helical wire as a part thereof, the polymer material core having inner and outer surfaces and including a first adhesive. The duct also includes a fire resistant barrier material surrounding the outer surface of the polymer material core, the fire resistant barrier material including a seam running longitudinally along the length of the uninsulated flexible duct, the longitudinal seam having an overlap zone that contains at least one second adhesive to maintain an integrity of the longitudinal seam. The uninsulated flexible duct is one that is free of any vapor barrier and has a flame spread index and smoke developed index of zero (0) as defined in the UL 181 standard. Component parts of the duct are controlled in terms of composition, amount, and / or configuration to achieve the Class 0 rating.

The invention belongs to the technical field of adhesives for PCBs (printed circuit boards), and particularly relates to a phosphorus-silicon synergistic flame-retardant UV-moisture dual-curing three-proofing adhesive. The phosphorus-silicon synergistic flame-retardant UV-moisture dual-curing three-proofing adhesive provided by the invention is mainly prepared from a poly-UV-silane moisture dual-curing polyurethane acrylate prepolymer, a photoinitiator, an active diluting monomer, a wetting leveling agent, a defoaming agent and fluorescent powder. The phosphorus-silicon synergistic flame-retardant UV-moisture dual-curing three-proofing glue prepared by the invention has the characteristics of excellent flame retardance and flame spread prevention on the basis of moisture-proof, salt mist-proof and mildew-proof functions. When a fire source exists outside, the material can effectively inhibit self-combustion, or can be automatically extinguished after the fire source is removed, can provide higher-grade safety guarantee for electronic equipment, and can be widely applied to the fields of electronic components, household appliances, automotive electronics, charging piles and the like.