734 results about "Cold area" patented technology

The invention discloses a hydrogen fuel cell vehicle ultralow temperature cold start thermal management system, and relates to the technical field of hydrogen fuel cell vehicle thermal management, the hydrogen fuel cell vehicle ultralow temperature cold start thermal management system comprises a thermal management platform, the thermal management platform is in communication connection with the following modules: a temperature monitoring and predicting module, and the temperature prediction module is used for monitoring the temperature of key parts in the hydrogen fuel cell by using the temperature sensor and predicting the change trend of the temperature in the fuel cell in combination with the temperature prediction model. By utilizing the high-precision temperature sensor and the long-short-term memory network model, the internal temperature change trend of the fuel cell is pre-judged in advance, the heating power is dynamically adjusted, it is ensured that the temperature of the cell is rapidly increased to the proper working temperature in the ultralow-temperature environment, starting difficulty caused by local supercooling is avoided, the low-temperature starting time is remarkably shortened, and the starting efficiency is improved. The reliability and the stability of the system in an extreme environment are improved, and the normal operation of the hydrogen fuel cell vehicle in a cold region is guaranteed.

The invention discloses a fan blade icing monitoring system and method, and relates to the technical field of wind power generation, and the system collects temperature, humidity and vibration signals in real time through a multi-sensor module installed on a fan blade, fuses multi-parameter data through an edge calculation unit, and calculates a blade icing risk factor # imgabs0 #. The risk factors are calculated by adopting a dynamic weighting model, and the icing state of the blade is accurately evaluated in combination with normalized characteristic values # imgabs1 #, # imgabs2 # and # imgabs3 #. And when the risk factor exceeds a set threshold value, the system triggers an alarm and transmits data to the cloud through the wireless communication module. The cloud platform predicts the future icing risk based on a long-short term memory (LSTM) neural network model in combination with historical data and real-time monitoring data, the accuracy and real-time performance of icing monitoring are improved, the method is suitable for operation in cold regions and high-altitude wind fields, and reliable guarantee is provided for safe and efficient operation of fans.

The invention discloses a drainage plate for an unsaturated soil roadbed in a cold region. The drainage plate comprises a hydrophobic layer, a drainage layer and an anti-freezing layer which are sequentially arranged in parallel, the hydrophobic layer is made of a hydrophobic material; the drainage layer comprises at least two layers of capillary structures and water-absorbing fibers filled between the capillary structures, the outer layer is a vertical honeycomb tube, the inner layer is a horizontal honeycomb tube, and the radius is gradually reduced from outside to inside; the capillary tube structure adsorbs pore water in unsaturated soil through capillary action, and the water-absorbing fibers drive water to be discharged out of the roadbed through water content difference; and the anti-freezing layer is made of a low-temperature-resistant polymeric material. According to the drainage plate, through the capillary action of the middle three-dimensional drainage layer, pore water dispersed in unsaturated soil is actively adsorbed, water is directionally discharged in combination with gravity, and the problem that a traditional drainage pipe is low in efficiency in the unsaturated soil is solved; meanwhile, through double-layer protection of the hydrophobic layer and the anti-freezing layer, a moisture seepage path is blocked, soil particles are prevented from invading, and a drainage channel is prevented from being blocked.

The invention discloses an analogue simulation system for operation of a ground source heat pump and a gas boiler in a severe cold area. The analogue simulation system comprises a heat supply correction model building module, a ground source / gas heat supply estimation module, a heat supply dispatching distribution module and a correction model optimization module. According to historical operation data of a ground source heat pump subsystem, heat supply correction models associated with soil geology and environmental climate are constructed based on a single variable principle, a heat supply amount estimated value of the ground source heat pump subsystem is dynamically corrected, heat supply amount of a gas boiler subsystem and heat load required by a building group are estimated, heat supply output of the two subsystems is intelligently distributed, and heat supply efficiency is improved. And the heat supply amount correction model is optimized through the actual heat supply amount deviation. The method can effectively overcome the problem of ground source heat pump heat supply amount deviation caused by soil heat unbalance and climate fluctuation in a severe cold area, further improves the energy efficiency estimation precision of a heat supply system, facilitates optimization of a scheduling strategy, has dynamic compensation and model self-evolution capabilities, and can adapt to complex environmental changes.

The invention relates to the technical field of snow melting disaster early warning, in particular to a snow surface rain disaster identification method based on a high and cold mountainous area and a related product, and the method comprises the steps: constructing a snow surface rain disaster single-point identification rule capable of being physically explained by using meteorological observation data and remote sensing inversion data of a small amount of weather stations in the high and cold mountainous area; the method is advantaged in that classification is carried out without depending on a black box model, precision and interpretability of single-point snow surface rain event discrimination are improved, regional popularization is carried out through dynamic downscaling simulation of a regional climate mode WRF coupling land surface process model Noah-MP, a point-surface fusion snow surface rain disaster discrimination and identification system is constructed, and the method is advantaged in that the method is simple and convenient to operate. The method is suitable for identifying snow rain disasters in complex terrain areas with high and cold areas, high altitude, large gradient, lack of data, even no data and the like, and solves the technical problems of insufficient snow rain disaster space identification capability and low precision caused by sparse observation data in the high and cold mountainous areas in the prior art.

The invention relates to the field of data storage, in particular to a storage and calculation separation multi-dimensional data block indexing method based on adaptive learning. Comprising the steps of receiving original multi-dimensional data and a query load, and outputting a low-dimensional key set through a first model; the low-dimensional key set and the historical query load generate a partitioning scheme through a second model, and the partitioning scheme performs physical recombination on the original multi-dimensional data to output a plurality of physical data blocks; constructing a learning type index through the physical data blocks and the corresponding partitioning schemes; identifying hot spot and cold spot areas through the query frequency of each node of the learning type index and the real-time query load continuous monitoring index; when the access mode changes, adjusting the index structure, and outputting a self-adaptive index; and quickly positioning and reading the target data block through the self-adaptive index to complete access. According to the method, the index of adaptive learning is provided, and the index structure and the physical data layout are adjusted, so that the query accuracy and efficiency in a complex scene are improved, and the data storage overhead is reduced.

The invention provides a temperature control type anti-frost-heaving retaining wall structure and a design method thereof, and belongs to the technical field of infrastructure retaining engineering in cold regions, the temperature control type anti-frost-heaving retaining wall structure comprises a retaining wall body, a ground temperature energy conversion system and an intelligent control system, and the ground temperature energy conversion system is connected with the retaining wall body; the ground temperature energy conversion system is used for absorbing ground temperature energy, converting a gas-state heating medium from a low-pressure state into a high-pressure state, adjusting the flow of a liquid-state heating medium, reducing the pressure of the heating medium and dissipating the ground temperature energy into the retaining wall body, and the intelligent control system is electrically connected with the ground temperature energy conversion system; the controller is used for monitoring the temperature of filling soil on one side of the retaining wall body and controlling the ground temperature energy conversion system to operate according to the filling soil temperature so as to control the retaining wall body temperature and filling soil heat. The technical problems that the retaining wall frost heaving disease control difficulty is large, and the frost damage prevention and control effect is poor are solved, and the technical effects that the retaining wall and the filling temperature can be controlled, frost heaving disease control is easy, and the frost damage prevention and control effect is good are achieved.

The invention relates to a ventilation system for a high-voltage frequency converter room in severe cold areas and a working method of the ventilation system. The ventilation system comprises a fresh air handling unit, a fresh air pipeline, an air supply pipeline, an air inlet pipeline, an air return pipeline, an inner exhaust pipeline and an outer exhaust pipeline. The fresh air handling unit is composed of a fresh air section, a first heating section, an air return section, a second heating section, a fan section and an air supply section. A fresh air electric regulating valve is arranged on the fresh air pipeline; the first heating section and the second heating section are provided with heaters, and the fan section is provided with a fan; an air return electric regulating valve is arranged on the air return pipeline; a natural air inlet electric valve is arranged on the air inlet pipeline; an inner exhaust electric control valve is arranged on the inner exhaust pipeline; an external exhaust air electric regulating valve is arranged on the external exhaust pipeline; the ventilation system can effectively solve the problems existing in temperature control of the high-voltage frequency converter chamber in severe cold and cold areas, and is simple and compact in structure, convenient to construct and use, suitable for various working conditions and climate conditions and remarkable in energy conservation and emission reduction effect.

The invention discloses an alpine meadow aboveground biomass monitoring method based on PROSAIL-BP, and belongs to the field of ecological remote sensing information processing. In order to overcome the defect that samples in the alpine region are insufficient and have high precision and high reliability, the method comprises the steps that an alpine meadow mask, remote sensing images and field biomass data in a target region are obtained, the remote sensing images are spliced, the wave band reflectivity is normalized, and the grassland region reflectivity is reserved in combination with mask cutting; predefining a PROSAIL model matched with the region features; performing Sobol global sensitivity analysis to obtain a first-order sensitivity index and a total-order sensitivity index of the parameter; screening a key wave band and four high-sensitivity parameters; uniformly sampling to generate a parameter group, simulating a hyperspectrum through PROSAIL, extracting the reflectivity of a key wave band, and constructing a data set by multiplying a leaf area index by a dry matter content as a target variable; and training a three-layer BP neural network, and processing the reflectivity output pixel biomass of the remote sensing key wave band. The method is applied to a remote sensing information processing system and has high precision and high reliability.

The invention provides a high and cold area strip mine rock explosibility grading method, and relates to the technical field of mine rock explosibility grading. According to the method, field experiments, numerical simulation and an intelligent algorithm are combined, and the influence of climate and geological conditions of a high and cold area on rock mass explosibility is considered; the method comprises the following steps: establishing an explosibility index system comprising cold region climate and geological conditions, rock physical and mechanical properties, explosive blasting parameters and a blasting process, determining a fuzzy membership degree, a relative weight and a comprehensive weight of each evaluation index by using a fuzzy evaluation method and adopting a trapezoidal membership function, and proposing an explosibility grading method considering the cold region influence.

The invention discloses an alpine region charging pile micro-electric heating assembly system and a working method, and the system comprises an alpine region charging pile electrical box which is internally provided with a plurality of fixed micro-electric heating units and temperature sensors in a discrete manner. The plurality of fixed micro-electric heating units are distributed near a plurality of electrical elements needing special anti-freezing protection in an electrical box of the charging pile in the alpine region; and the risk problems of cracking of various elements of the charging pile, inflexible action part of the relay, performance reduction and the like in an extremely low temperature environment are effectively relieved.

The invention relates to the technical field of concrete, and particularly discloses high-strength low-heat-conductivity self-compacting concrete and a preparation method thereof. The high-strength low-heat-conductivity self-compacting concrete can maintain ideal strength performance while improving the heat insulation performance, so that the high-strength low-heat-conductivity self-compacting concrete is more suitable for being applied to occasions sensitive to temperature, such as underground spaces and external walls in severe cold areas. In addition, the ceramsite provided by the invention also provides a new consumption way for the vanadium slag, and can effectively realize recycling of wastes.

The invention discloses a vapor chamber and a manufacturing method thereof. The vapor chamber comprises an upper cover, a lower cover and a metal foil, the lower cover is connected with the upper cover, a containing cavity is formed between the lower cover and the upper cover, and a cooling medium is contained in the containing cavity; the metal foil is arranged in the containing cavity, a condensation cavity is formed between the metal foil and the upper cover, an evaporation cavity is formed between the metal foil and the lower cover, and a plurality of capillary holes are distributed in the metal foil and communicated with the condensation cavity and the evaporation cavity. According to the vapor chamber, the metal foil is arranged between the upper cover and the lower cover, backflow of a liquefied cold area medium in the condensation cavity into the evaporation cavity is achieved through the capillary holes formed in the metal foil, and the overall thickness of the whole vapor chamber can be set to be smaller due to the arrangement of the metal foil.

The invention relates to the technical field of stamping dies, in particular to a cooling system of a stamping die and the stamping die, the cooling system comprises a cooling liquid tank, and further comprises a water pump mounted in the cooling liquid tank; the fixed pipe is fixedly communicated with the side wall of the cooling liquid tank; the first connecting pipe is fixedly communicated between the water pump and the fixed pipe; the telescopic spraying assembly is installed in the fixing pipe and used for spraying cooling liquid on the surfaces of a lower die and an upper die of the stamping die body when the stamping die body conducts stamping part transposition; the telescopic spraying assembly further comprises an airflow driving assembly, and when the telescopic spraying assembly is started, the airflow driving assembly is started synchronously. According to the device, through the arrangement of the telescopic spraying assembly, an atomized cold area is driven to diffuse to the periphery, the flowing and evaporation effect of atomized cooling liquid can be accelerated, the cooling effect of the cooling liquid on a mold is improved, and the cooling efficiency is improved.

The invention belongs to the technical field of corrugated pipes, and discloses a low-temperature-resistant PVC corrugated pipe and a preparation method and application thereof.The low-temperature-resistant PVC corrugated pipe is prepared from, by weight, 90-100 parts of PVC, 20-30 parts of HPVC, 15-25 parts of HNBR, 10-15 parts of functional additive, 8-12 parts of cold-resistant agent, 2-3 parts of antioxidant, 2-4 parts of stabilizer and 1-2 parts of lubricant; wherein the functional additive is obtained by grafting diethyl allyl phosphate and glycidyl methacrylate on an ethylene-vinyl acetate copolymer. In a specific PVC / HPVC / HNBR / functional additive system, through the synergistic effect of interface compatibility optimization, low-temperature resistance complementation and mechanical property balance, the PVC corrugated pipe still has excellent performance in a low-temperature environment, and application and popularization in cold regions or seasonal low-temperature time regions are facilitated.

The invention provides a cold region high dam reservoir discharged water temperature variation degree research method based on a factor analysis method. The method comprises the steps that a water temperature index system is constructed; selecting a research area, obtaining original data, and preprocessing the original data; performing zero-mean standardization on the original data to obtain effective data; and evaluating the variation degree of the discharged water temperature of the reservoir by using a factor analysis method. According to the method, the variation degree of the discharged water temperature of the high dam reservoir in the cold region is evaluated through a factor analysis method, related variables are summarized into several independent common factors, each variable is loaded on one factor as much as possible, the obtained common factors reflect information of original variables more accurately compared with principal components, the data analysis efficiency is improved, and the accuracy of data analysis is improved. And each index weight represents the comprehensive contribution proportion of the factor analysis evaluation score.

The invention provides a phase change-moisture absorption and drainage composite roadbed structure in a seasonal frozen region and an intelligent regulation and control method, and relates to the technical field of roadbed design and renovation. The roadbed structure is characterized in that a plurality of gradient phase change material layers are arranged on the top surface of a roadbed surface layer; the multi-layer gradient phase change material layer, the high moisture absorption and drainage geotextile layer and the drainage pipe system are arranged from top to bottom; the phase change temperature intervals and the phase change latent heat of the phase change layers in the multiple gradient phase change material layers are different; the high moisture absorption and drainage geotextile layer is used for guiding water in the soil body into the drainage pipe system; the drainage pipe system is of a porous structure with the inclination angle within the set angle range and is used for guiding water in the soil into the drainage ditch. And the intelligent regulation and control system is used for dynamically regulating the thermal resistance of each phase change layer and the opening degree of the drainage pipe. According to the invention, the time of the roadbed in a relatively stable physical state can be prolonged, so that the purpose of preventing and treating winter frost heaving, frost boiling and mud rising in a spring melting period and other diseases caused by temperature change of the roadbed in severe cold areas is achieved.

The invention relates to a method for regulating and controlling atomic scale silicon-silicon and aluminum-aluminum interface thermal conductance. The method comprises the following steps: (1) establishing a silicon-silicon and aluminum-aluminum molecular dynamics thermal transport model consisting of a hot area and a cold area; (2) executing molecular dynamics simulation and data processing: (1) determining a dependency relationship of interface thermal conductivity on a torsion angle; (2) determining the influence of the overlapping area of the phonon state density on heat transport in different interface contact states; (3) revealing the internal reason of the interface contact state influencing the interface thermal conductivity; (4) determining the dependency relationship of the system temperature on the interface thermal conductance; and (5) calculating the overlapping area of the phonon state density, the phonon number and the phonon participation rate at different temperatures to reveal the internal mechanism that the system temperature affects the interface thermal conductivity. According to the invention, research on silicon-silicon and aluminum-aluminum interface heat transport is carried out based on the torsion angle and temperature, and an important basis is provided for understanding an internal mechanism of heat transfer of solid materials with different contact interfaces and searching an effective method for controlling interface heat conduction.

A system and method for controlling motorized vents of an HVAC system of a vehicle including at least one motor to move air louvers of an HVAC vent of the HVAC system, at least one thermal sensor to sense hot / cold areas inside the vehicle, and a position and motion control to control movement of the at least one motor, wherein position and motion control determines a targeted positioning of airflow based on hot / cold areas sensed by the thermal sensor.

The invention discloses an ultra-low temperature toughened nylon glass fiber reinforced composite material, a preparation method and an application thereof. The composite material comprises 50-70 parts of nylon resin, 20-40 parts of glass fiber, 5-10 parts of toughening agent, 0.1-5 parts of cross-linking agent and 0.1-10 parts of other auxiliary agents by weight; the toughening agent comprises a maleic anhydride modified elastomer; the cross-linking agent comprises an amino cage silsesquioxane; the composite material has a simple supported beam notched impact strength of ≥15 kJ / m at -50 °C 2 The impact rod is tested at 50°C without breaking at least once. The ultra-low temperature toughened nylon glass fiber reinforced composite material of the present invention has both high impact strength and mechanical toughness in a wide temperature range, especially in an ultra-low temperature environment, and can meet the needs of railways, highways, electricity and other facilities in cold areas.

The invention relates to the technical field of circulating water anti-freezing, and discloses a power plant circulating water anti-freezing system suitable for a cold region, and the system comprises a temperature sensing module, an anti-freezing heating module, a water flow disturbance module, an ice layer processing module, an intelligent regulation and control center and a fault safety module; when the circulating water system of the power plant operates in a cold region, the internal water temperature and external environment parameters of key nodes of a circulating water pipe network are monitored in real time, and a low-temperature early warning signal is generated based on a temperature field reconstruction algorithm of machine learning, so that abnormal temperature fluctuation can be recognized in time, early warning delay and false alarm caused by wind speed and humidity interference are avoided, and the working efficiency is improved. And in the circulating water anti-freezing process, the output power of the flexible electric heating body is dynamically adjusted through a graded heating mechanism, and the turbulence generator is linked to optimize water flow distribution, adapt to thermal inertia change of a pipeline and prevent the risk of local icing caused by sudden temperature drop.

The invention discloses a fan. The fan comprises a circuit board; the fan module is electrically connected with the circuit board and located at the air inlet; the temperature control module is electrically connected with the circuit board and communicates with the fan module, the temperature control module comprises at least one semiconductor chilling plate, a cold plate set and a hot plate set, the semiconductor chilling plate is provided with a cold area and a hot area which are oppositely arranged, the cold plate set is correspondingly arranged in the cold area of the semiconductor chilling plate, and the hot plate set is correspondingly arranged in the hot area of the semiconductor chilling plate; wherein the fan module is used for guiding air flow to the temperature control module, the air flow passes through a cold piece set located in a cold area and a hot piece set located in a hot area in the temperature control module to form cold air and hot air, the cold air and the hot air are exhausted through a cold air outlet and a hot air outlet which are arranged at intervals, effective separation of the cold air and the hot air can be achieved, and the refrigeration efficiency is improved.

The invention discloses a method for preserving heat of a urea NaOH and Mg (OH) 2 storage cabin, and aims at a ship which is provided with an SCR (Selective Catalytic Reduction) system, an EGR (Exhaust Gas Recirculation) system, an iCER (Initial Continuous Emission Reduction) system and a desulfurization system and needs to store urea, NaOH or Mg (OH) 2. Condensed water of the air conditioning unit is collected and then introduced into the storage cabin in a gravity mode, and the condensed water generation amount and the condensed water temperature of the air conditioning unit are analyzed and calculated. On the premise that the cabin capacity meets the condition, condensate water is used for cooling the urea cabin and then discharged into the clean cabin bottom water cabin, and the cooling capacity of the condensate water is utilized to the maximum extent. In winter or in a cold area, when the air conditioning unit does not need to operate, in order to avoid too low temperature of the solution cabin, the storage cabin can be heated by using the discharged water in the clean cabin bottom water cabin before discharging, so that the storage temperature of the urea, NaOH or Mg (OH) 2 solution is ensured to be 10-35 DEG C.

The invention relates to the technical field of biological environment. The invention provides a detection method for determining a temperature threshold value for maintaining denitrification activity of wetland rhizosphere microorganisms under a low-temperature condition. The detection method comprises the following steps: (1) planting wetland plants in a test area; (2) gradually reducing the environment temperature of the test area; (3) collecting rhizosphere soil samples and water body samples under different temperature gradient conditions; (4) detecting the denitrification activity of the rhizosphere soil sample, the composition and diversity change of functional microbial communities, the physicochemical properties of soil and the nitrogen concentration change of a water body; and (5) calculating the temperature threshold for maintaining the activity of the functional microorganisms. The method provided by the invention can provide technical support for improving the denitrification effect of the wetland in the low-temperature environment, so that the wetland can play a good role in winter or cold regions, the selection of plant species and the regulation and control of growth conditions in wetland restoration engineering can be guided, and the denitrification capability of the wetland is improved.

The utility model provides a wounded person back-delivery cabin, and relates to the technical field of accident scene back-delivery equipment. The heating layer achieves heating and heat preservation of the wounded person, the monitoring equipment, the first-aid equipment bag and the negative pressure equipment, so that the situation that the injury condition of the wounded person is aggravated due to severe cold is avoided, and meanwhile the monitoring equipment and the negative pressure equipment maintain normal operation in the field environment of the cold region. And the first-aid medicine and the first-aid equipment in the first-aid equipment bag play a normal first-aid role on the wounded. The hatch cover shields the supporting part, and protective coatings are arranged on the outer surface of the supporting part and the outer surface, away from the side of the supporting part, of the hatch cover at the same time, so that harmful substances in nuclear accidents and chemical accidents are prevented from entering the supporting part to aggravate the injury condition of the wounded. A monitoring device located in the first storage cabin, a first-aid device bag located in the second storage cabin and a negative pressure device located in the third storage cabin provide basic life support for the wounded personnel through the monitoring device located in the first storage cabin, the first-aid device bag located in the second storage cabin and the negative pressure device located in the third storage cabin. The protection piece prevents emergency personnel and the like from mistakenly touching an equipment button in the electricity storage cabin to change equipment parameters.

The invention relates to the field of thermal management systems, in particular to a thermal management system and a vehicle with the thermal management system. Comprising a fuel heating system and an air conditioning system. The fuel oil heating system comprises a fuel oil heating pipeline; a fuel oil heater, a warm air core body and a first water pump are arranged on the fuel oil heating pipeline; the fuel oil heating pipeline comprises a first liquid inlet pipeline, a first connecting pipeline and a first liquid return pipeline; a fuel heater and a first water pump are arranged on the first liquid inlet pipeline; a warm air core body is arranged on the first connecting pipeline; according to the heat management system disclosed by the invention, through the arrangement of the fuel heating system, a user in a cold region in winter can heat a passenger compartment and preserve heat of a battery pack in a fuel heating mode, so that the power consumption of the whole vehicle can be greatly reduced, the endurance mileage in winter is improved, and the anxiety of the user in the cold region to the endurance mileage in winter is solved; and the driver can be warmed securely in winter.

The embodiment of the invention discloses a cold region heterogeneous slope hydrothermal coupling and freezing depth inversion method and system, and the method comprises the steps: obtaining air temperature day-by-day change data of a research region, and carrying out the fitting of the air temperature day-by-day change data, and obtaining an air temperature day-by-day change equation; basic physical parameters of a soil body are determined, and a soil body parameter random field is constructed; constructing a numerical simulation model according to site information of a research area, determining a calculation method of a temperature field and a moisture field, and applying corresponding hydrothermal boundary conditions on the basis of the numerical simulation model to obtain a hydrothermal coupling numerical model; importing a soil parameter random field into the hydrothermal coupling numerical model, and establishing a random hydrothermal coupling model considering the soil parameter heterogeneity; and performing analog calculation on the random hydrothermal coupling model, outputting temperature and moisture change characteristics of the model at different time and positions, determining the freezing depth according to the temperature and moisture change characteristics, and performing statistical analysis on a calculation result. According to the method, the non-uniformity of soil parameters is considered, and the accuracy of predicting the freezing depth is improved.

The present invention provides a spray-applied polyurethane insulation material for tunnels in cold regions, its application, and its construction method. The spray-applied polyurethane insulation material for tunnels in cold regions is composed of raw materials with a mass ratio of 0.8-1.2 of material A and material B. By mass parts, material A includes 90-100 parts of polyether polyol, 90-100 parts of polyester polyol, 5-10 parts of chain extender, 1-4 parts of catalyst, 10-20 parts of flame retardant, 0.5-3 parts of water, and 1-3 parts of surfactant. The B component is diphenylmethane diisocyanate. The flame retardant is composed of flame retardant A and flame retardant B in a mass ratio of 10:1-2.5. The spray-applied polyurethane insulation material of the present invention is used to construct tunnel structures in cold regions, providing good flame retardant and insulation effects.

The invention discloses an anti-freezing device for a winter hydrological monitoring system in a severe cold area, and the anti-freezing device comprises water disturbance equipment which is provided with a water outlet located in water in a hydrological monitoring cylinder. And the water disturbance equipment continuously conveys water to water in the hydrological monitoring cylinder through the water outlet so as to disturb the water in the hydrological monitoring cylinder. According to the device, disturbance equipment, such as a submersible pump or a centrifugal pump, is integrated in a hydrological monitoring cylinder through an integrated frame; the disturbance equipment goes deep into a certain water level and then continuously disturbs a water body so as to achieve the anti-icing effect.

The utility model provides a double-layer roof eave gutter node structure. The double-layer roof eave gutter node structure comprises a reinforced concrete flat roof structure, the parapet wall is fixedly connected with the end part of the reinforced concrete flat roof structure; the fabricated light pitched roof structure is fixedly connected with the parapet wall; the parapet wall is provided with a plurality of flat roof drain pipes; the eave gutter is fixedly connected with the reinforced concrete flat roof structure; a rainwater pipe is arranged in the eave gutter and is used for organized drainage; a wall plate is arranged on one side of the eave gutter. The heat preservation performance and the waterproof performance of the building roofs in the cold and severe cold areas are effectively improved, and the drainage performance of the building roofs in the cold and severe cold areas is effectively improved through the method that the outer eave gutters extend from the pitched roofs and the flat roofs; installation is normative, construction is easy and convenient, materials are saved, economy and attractiveness are achieved, practicability is high, the construction method is compact and reasonable, construction is easy and convenient, the application range of the method is wide, the technical vacancy is made up, and the problems that no clear norms exist and secondary design is unreasonable are solved.