643 results about "Forced convection" patented technology

The invention discloses a heat dissipation method for a high-power device in a logging instrument, and relates to the technical field of heat dissipation of logging instruments. The heat dissipation management system is realized based on a heat dissipation management system, and the heat dissipation management system comprises a heat conduction module which adopts a heat pipe or a heat plate made of a high-heat-conductivity-coefficient material and is used for rapidly conducting heat generated by a high-power device to a heat dissipation module; and the heat dissipation module comprises a plurality of heat dissipation fins and / or fans which work in parallel, the heat dissipation fins improve the heat dissipation efficiency by increasing the heat dissipation area, and the fans enhance air flow through forced convection to promote heat exchange. The heat pipe or the heat plate made of the high-heat-conductivity-coefficient material is adopted, heat is quickly conducted to the heat dissipation module, and accumulation of the heat at a source is effectively reduced; the control module dynamically adjusts a heat dissipation strategy according to real-time temperature monitoring data, such as the fan rotating speed and fluid circulation, and it is ensured that the heat dissipation effect is matched with the actual requirement.

The invention provides a strengthening and toughening control method for a high-strength titanium alloy welded joint, and relates to the technical field of metal material welding, the strengthening and toughening control method comprises the following steps: S1, during welding, multi-layer and multi-channel gradient heat input is adopted, the heat input quantity of front-channel welding is Q1, the heat input quantity of rear-channel welding is Q2, and Q1 is greater than Q2; s2, after welding, cooling a welding area by stages, adopting inert gas forced convection cooling in a primary cooling stage, adopting water mist pulse cooling when the welding area is cooled to a medium temperature stage, and adopting natural air cooling when the welding area is cooled to a low temperature stage; through the synergistic effect of multi-layer multi-channel gradient heat input and staged cooling, the microstructure and performance of the high-strength titanium alloy welded joint can be effectively regulated and controlled, the structure gradient regulation and control of the titanium alloy welded joint are achieved, the tensile strength, the ductility, the fracture toughness and the creep property of the welded joint are improved, meanwhile, the process can be simplified, and deformation is reduced.

The invention relates to the technical field of metal material heat treatment, in particular to a gradient temperature control method for a stainless steel cold rolling annealing process. Comprising the steps that an annealing furnace is divided into independent temperature control sections in the strip steel conveying direction, each temperature section is provided with an electric heating wire set, a forced convection cooling air duct and a high-precision infrared temperature measurement array, temperature data are collected in real time, and a target gradient temperature curve is generated; constructing a phase change power-temperature correlation model, and outputting a theoretical gradient temperature curve; a three-stage MPC is adopted to cooperatively control and output a control signal; and the heating power and the cooling strength are adjusted in real time according to the control signal, if the temperature fluctuation exceeds the limit, the power is compensated through a PID algorithm, the strip steel speed is adjusted, and closed-loop feedback is formed. Through multi-section independent temperature control, thickness-temperature dynamic modeling and a three-level cooperative control framework, accurate tracking of a gradient temperature curve is achieved, and the quality and efficiency of the annealing process are improved.

The utility model discloses a vehicle-mounted dehumidification protection air temperature type carbon dioxide gasification pry. The device comprises a protection box body and a gasifier located in the protection box body, the gasifier is provided with a gasification tube bundle, the front end of the gasification tube bundle is connected with the liquid separation side of a high-pressure common rail pipeline, and the rear end of the gasification tube bundle is connected with a carbon dioxide outlet pipeline through a collection box; the top of the protection box body is provided with a fan, the side face is provided with a shutter, and the bottom is provided with a dehumidification protection net and a folding protection bottom plate. And the fan adopts a blowing type or induced air type working mode, and adopts different air inlet modes according to different air humidity conditions, so that the gasification efficiency and stability are improved. According to the forced convection heat exchange principle, based on the bottom dehumidification device, the inertia separation technology of gas-liquid speed steering is utilized, two different operation states of the draught fan are adopted, and all-weather efficient, stable and safe high-pressure gasification operation is achieved by matching angle adjustment of the shutters on the two sides and air injection and entrainment to remove the influence of the boundary effect of the wall face.

The utility model discloses a control cabinet with a desinsectization function, and relates to the field of electrical engineering, in particular to the control cabinet with the desinsectization function, which comprises a top cross beam, upright posts, inclined struts and the like. The insect expelling lamp and the sound wave insect expelling device are used in a combined mode, insect invasion is effectively reduced, and internal electrical equipment is protected. The insect repelling lamp attracts and kills insects, and the sound wave insect repeller emits ultrasonic waves or infrasonic waves which interfere with the insects to repel the insects which are not sensitive to light. And secondly, the cooling fan is additionally arranged at the ventilation opening of the control cabinet, air circulation is greatly improved through forced convection, the internal temperature is effectively reduced, and electronic components are prevented from being overheated. And finally, normal operation in a low-temperature environment is ensured by using a heating pad, heat preservation or heat dissipation is adjusted according to the air temperature through the manual adjusting function of a shutter baffle, cold air invasion is avoided, the equipment stability is ensured, and the service life is prolonged.

A pool type reactor safety management system comprises a reactor shut-down device, a passive residual heat removal device, a main circulation device, an auxiliary circulation device and a passive circulation device, and the reactor shut-down device is used for realizing reactor shut-down under accident conditions; the passive residual heat removal device forms natural circulation of the reactor water pool and the external hot trap; the main circulating device provides a circulating pipeline and drives cooling water to circulate under a normal working condition; the auxiliary circulating device comprises an auxiliary circulating pump connected to the main circulating pump in parallel; and the passive circulating device comprises a natural circulating valve arranged in the lower cavity of the reactor. The system can effectively avoid overheating of the cooling water under the accident working condition, so that the flowing direction of the cooling water is quickly switched from forced convection under the normal working condition to natural convection under the accident working condition, the flowing stagnation is prevented, and the safety and the reliability of the pool type reactor are effectively improved. The invention also provides a pool type reactor safety management method.

The invention relates to an environmental test box for realizing high and low temperature rapid alternating circulation, which is mainly applied to the technical field of environmental test equipment. The test box is provided with a high-temperature chamber and a low-temperature chamber which are independent from each other, a thermal insulation layer is arranged between the two chambers, and the test box can respectively keep constant temperature environments at the highest temperature of + 75 DEG C and the lowest temperature of-50 DEG C; during a test, a sample is placed in the test bed, and the rotating shaft structure driven by the motor periodically rotates in a reciprocating manner or rotates in the same direction among different temperature zones, so that high-low temperature rapid alternating circulation is realized. The operation mode of the motor is controlled through the control system so as to simulate the accelerated aging process of the component in the temperature rapid alternating environment. According to the test box, through the design of the control system, the forced convection fan and the middle thermal insulation layer, it is guaranteed that the temperature switching process is rapid, uniform and stable. Compared with the prior art, high and low temperature circulation can be completed without overall heating and cooling of the interior of the test box, and the test box has the advantages of being high in test efficiency, capable of remarkably improving the reliability and accuracy of the high and low temperature alternating circulation test of the sample and the like.

The invention discloses a water heater, and relates to the technical field of heat exchange equipment, the water heater comprises a shell, a combustion heat exchange system and an electric control box, and the shell is provided with an air inlet channel; the combustion heat exchange system is arranged on the shell, the combustion heat exchange system comprises a combustor and a fan, and the fan is arranged below the combustor; and the electric control box is arranged in the air inlet channel and is close to the fan. According to the technical scheme, the electric control box is arranged in the air inlet channel, heat generated by the electric control box is rapidly taken away by flowing air in a convection mode, the heat dissipation efficiency of forced convection is far higher than that of natural convection, the air flowing speed is higher, the heat transfer efficiency is higher, and therefore the heat dissipation efficiency of the electric control box is improved.

Liquid cooling apparatus and system for the immersion cooling of electronic devices including in particular servers and IT hardware nodes having an array of heat generating electronic components including for example microprocessors, GPUs, CPUs, RAM, motherboards etc. The present apparatus comprises at least one rotor adapted for creating a liquid flow stream localised to the electronic component(s) for the efficient and effective forced convection cooling according to an active cooling arrangement. The present arrangement is configured for both active and passive operation and is adapted specifically not to obstruct passive liquid flow adjacent an electronic component when the at least one rotor is not operational.

The invention discloses a device and a method for simulating heat exchange and friction resistance measurement of an aviation high-speed motor under different working conditions, and relates to the field of heat management of high-speed rotating equipment. An additional heating sheet is attached to the outer surface of the inner rotor, and different surface structures are detachably assembled on the outer rotor to form a stator and rotor slit flow channel boundary; cooling liquid forms one-inlet and one-outlet forced convection through the radial through hole of the end cover. The rotating speed larger than or equal to 20,000 rpm, runner pressure drop and temperature data are synchronously collected through an axle load type sensor, and the heat exchange coefficient, the flow resistance coefficient and the friction resistance coefficient are calculated in real time based on energy conservation, a Darcy formula and a torque empirical formula. A real rotor surface structure is reproduced under the condition of high-speed rotation, working medium leakage is restrained through mechanical sealing, and runner blockage caused by centrifugal deformation of the surface structure is prevented through the outer rotor designed in an integrally-formed mode; the obtained convective heat transfer-resistance coefficient-friction resistance coefficient all-parameter curved surface database can guide optimization of the cooling flow channel of the aviation motor.

A drink station is provided with an alkaline filter cartridge in fluid communication with an ambient temperature water line provide alkaline water, and with a chilled water mixed with the alkaline water at a spigot to provide chilled alkaline water. A hot water heating element is located below the spigot so hot water flows upward for dispensing from the spigot, with a vent line between the heating element and spigot helping hot water to flow from the spigot to the heating element. A refrigeration system and a carbonation system is also provided. The refrigeration system uses the ice-bank technology. A submersible agitator pump improves heat exchanged between ice-bank and water by forced convection. The agitator pump operating based on the temperature of the drinking water. A figure eight evaporator coil can provide two cylindrical ice banks and two chilled water coils to increase the chilled water capacity.

The invention discloses a solid waste water content prediction system and method based on an infrared thermal imager. The temperature field of the solid waste on the conveyor belt in the natural convection and forced convection moisture evaporation process is monitored and compared in real time through the thermal infrared imager, and the moisture content of the solid waste can be accurately predicted in combination with data processing, environmental parameter correction and prediction of a regression equation. Compared with a traditional sampling detection method, the method has the advantages of being high in real-time performance, non-contact, simple in equipment, good in economical efficiency and the like, can adapt to a complex industrial field environment, and provides a new technical means for intelligent and refined control over waste incineration. The system is simple in structure, high in reliability, good in detection precision and capable of achieving real-time prediction of the water content of the solid waste entering the furnace.

The invention discloses a focusing type acoustic streaming heat dissipation device facing a chip. The device belongs to the crossing field of ultrasonic technology and heat dissipation technology and is composed of a piezoelectric stack, an acoustic lens, a splitter plate, a base, a supporting rod, a copper electrode and the like. According to the device, geometric parameter configuration of the splitter plate, the piezoelectric stack and the acoustic lens is optimized, and a double-piezoelectric-plate stacked structure is adopted to enhance the ultrasonic resonance effect; high-frequency alternating voltage is applied to the copper electrodes at the two ends of the piezoelectric stack, high-frequency sound waves are excited through the inverse piezoelectric effect, and after the sound waves are focused through the sound lens, a gradient sound pressure field is formed in a cavity formed by the splitter plate and the piezoelectric stack; air molecules are driven to move directionally based on the acoustic streaming effect, so that air flow at an air inlet is accelerated by sound pressure to form high-flow-rate focusing jet flow at an air outlet, and targeted forced convection heat dissipation of a chip heat source is realized. According to the device, the ultrasonic technology and the heat dissipation technology are combined, the whole device is simple in structure, free of moving parts and low in noise, and various heat dissipation requirements can be met in an array mode.

The invention discloses a steel heat treatment quenching and tempering device which realizes full-process automatic connection of special-shaped steel parts from furnace charging, heating, quenching to tempering through rail type butt joint of a heating furnace and a quenching bath, accurate lifting of a hydraulic driving material frame and intelligent switching of a driving unit. The procedures are seamlessly switched, so that the process period is remarkably shortened, manual intervention is reduced, and the operation risk is reduced while the production efficiency is improved; in the heating and quenching process, the charging tray drives the special-shaped part to continuously rotate, electric heating bars evenly distributed in the heating furnace are matched with forced convection stirring in the quenching pool, it is guaranteed that the temperature of all parts of the special-shaped part is evenly distributed, and the risk of thermal stress deformation is effectively reduced; the structure uniformity, the hardness consistency and the comprehensive mechanical property of the quenched and tempered special-shaped part are remarkably improved through a dynamic treatment mechanism; high-temperature waste gas drives the wind wheel to rotate through the gas guide assembly, temperature homogenization of the quenching liquid is achieved, a U-shaped pipe magnetic attraction and sedimentation dual impurity removal mechanism is achieved, and the service life of the liquid is prolonged.

The invention discloses an oil-immersed transformer cooling system, and relates to the technical field of transformers, the oil-immersed transformer cooling system comprises a transformer body, heat dissipation fins, an oil conservator, a forced convection mechanism and a spraying mechanism, the transformer body comprises an oil tank, a winding and the oil conservator; the forced convection mechanism comprises a fan, the air outlet end of the fan faces the cooling fins, and the fan is started by sensing the oil temperature through an oil temperature sensor. The spraying mechanism comprises a water tank, a water pipe, a nozzle and a water pump, the water pump is driven by a fan shaft, and a cavity is formed in the fan shaft and communicated with the nozzle; comprising an adjusting assembly, the adjusting assembly comprises a sensing part and an adjusting part, and the sensing part senses the environment temperature through a bimetallic strip and drives the adjusting part to dynamically adjust the opening degree of a water inlet of a water pipe. The problems that in the prior art, due to the high environment temperature, the temperature difference between fins and the environment is reduced, and the heat exchange efficiency is affected are solved. The LED lamp has the advantages of being capable of adapting to the environment temperature, saving energy, dissipating heat efficiently and the like.

The invention discloses a cabinet cooling method and device, electronic equipment and a medium. The method comprises the steps that temperature data of multiple points in a space in a cabinet are collected; constructing a space temperature field based on the collected temperature data of the plurality of points in the space in the cabinet; constructing a heat source temperature state space model in an airflow balance state; constructing a forced convection heat dissipation temperature field based on a three-dimensional model of the cabinet, the space temperature field and the heat source temperature state space model; and determining the position of a local hot spot in the cabinet at least based on the forced convection heat dissipation temperature field, and arranging a guide plate in the cabinet according to the position of the local hot spot, so that cold air passes through the local hot spot and / or hot air is prevented from flowing back to the local hot spot. According to the invention, the heat dissipation performance of the cabinet is improved by analyzing the internal airflow organization of the cabinet and optimizing the air duct design.

The invention belongs to the technical field of additive design, comprises structure improvement and simulation analysis, and relates to an additive pipe fitting topological structure design method based on a three-period minimal curved surface. And different TPMS crystal lattices are applied to design, so that the TPMS system can adapt to various working conditions with different loads. Different filling modes are selected according to the geometrical morphology of the to-be-filled area, so that the number of interrupted areas is smaller, and the design freedom degree is higher. Through a gradient wall thickness command, a rod diameter gradual change effect appears in a non-contact area of a TPMS lattice and a part, and the supporting capacity is effectively enhanced under the condition that the removal difficulty is not improved. Adjustment of different unit densities enables TPMS crystal lattices to independently perform enhanced control on stress concentration points without affecting other areas. The actual conditions of a wind field and a temperature field are described through conjugate heat transfer analysis modeling, so that heat conduction and forced convection exist in the whole physical field at the same time, and the result accuracy is improved. According to static analysis, TPMS crystal lattices with the better strengthening effect are selected from the angle of load resistance.

The invention discloses a proton exchange membrane fuel cell bipolar plate flow channel structure based on a bionic structure, the proton exchange membrane fuel cell bipolar plate flow channel structure comprises a cathode flow field plate body and a plurality of gas flow channels arranged in the cathode flow field plate body, and two ends of each gas flow channel are respectively provided with a gas inlet and a gas outlet; a plurality of fin-shaped flow guide blocks are arranged in each gas flow channel, and flow channel side shrinkage flow guide blocks are arranged at the fin-shaped flow guide blocks; when the fin-shaped flow guide blocks and the side shrinkage flow guide blocks are used in a combined mode, a flow field in the flow channel can generate periodic forced convection in the direction perpendicular to the flow channel and can also generate periodic forced convection in the direction parallel to the flow channel. While the high gas passing ability is maintained, the flow field is accelerated by changing the vertical sectional area of the flow channel, and the convection effect of the gas to the GDL layer is actively enhanced.

The utility model relates to the technical field of dust prevention of bearing seats, and discloses a bearing seat with a dust prevention function, which comprises a shaft body, the side wall of the shaft body is fixedly connected with the inner ring of a bearing body, the outer ring of the bearing body is fixedly connected with a bearing seat body, and the inner wall of the bearing seat body is fixedly connected with an arc-shaped sealing ring. The end, away from the bearing seat body, of the arc-shaped sealing ring abuts against the shaft body, the shaft body is connected with the heat conduction ring in a sleeved mode, and a heat dissipation assembly is arranged in the heat conduction ring. According to the bearing seat with the dustproof function, the heat conduction ring rotates to enable cooling liquid in the arc-shaped liquid storage cavity to flow in an internal circulation mode, when the cooling liquid impacts the baffles to form small vortexes, the vortexes can bring a forced convection effect, the heat dissipation effect of the heat conduction ring in high-temperature application is improved, the protruding blocks can enlarge the contact area with air and the heat dissipation area, and the heat dissipation efficiency is improved. More heat can be taken away more quickly when airflow flows through a larger area, and the heat dissipation speed is increased.

The invention discloses a heat pipe thermophysical property testing device, system and method based on liquid cooling flow equalization, and the device comprises a liquid cooling flow equalization system which is provided with a plurality of parallel and mutually isolated flow channels, and a condensation section of a to-be-tested heat pipe is inserted into a liquid cooling cavity to form forced convection; an upper heating block and a lower heat insulation block of the heating unit clamp and fix an evaporation section of the heat pipe to be tested; the liquid cooling flow equalizing system is arranged on the inclination angle adjusting mechanism; the data acquisition unit comprises temperature sensors which are respectively arranged at liquid inlets and liquid outlets of the flow channels, and at least two temperature sensors which are arranged at a heat insulation section of the heat pipe to be tested; according to the system, a circulating water bath device, a high-pressure constant-flow pump, a filter and a testing device form a closed-loop liquid path. The real heat transfer amount of the heat pipe is inversely calculated through the heat absorption amount of the cooling liquid, the equivalent heat conductivity coefficient and the limit power are obtained by combining the two-point temperature difference of the heat insulation section, multiple heat pipes of different specifications are tested in parallel at a time, and the test efficiency and the data accuracy are improved.

The present invention relates to a novel ventilation structure for BIPV modules, which comprises photovoltaic modules matched with a building wall, the back of the photovoltaic modules is installed on the facade of the building wall in parallel through a plurality of steel columns, a ventilation gap is formed between the photovoltaic modules and the building wall, an air inlet passage for forming a constricted air inlet is transversely inserted in the bottom of the ventilation gap, and an air outlet chimney as an air outlet is longitudinally inserted in the top of the ventilation gap. The air duct between the photovoltaic modules and the building wall is modified, the natural convection in the ventilation gap can be accelerated to a high wind speed level similar to that of forced convection without requiring any mechanical fan device, enhancing the ventilation cooling of the BIPV modules without increasing power consumption.

A convection enhanced energy storage system includes an electrochemical cell with a positive electrode, a separator, and a negative electrode, a tank holding an electrolyte, and a pump connected to the electrochemical cell and the tank to circulate the electrolyte. The electrochemical cell has large γ and β values, which has high transport resistance from diffusion and there is limited salt in the electrolyte solution to compensate. A computer system can implement a model of a convection enhanced energy storage system, for example for simulation to select parameters for such an energy storage system. The model includes: a convection term in a Nernst-Planck equation representing the convection enhanced energy storage system; boundary conditions of a cell of the convection enhanced energy storage system to account for forced convection at boundaries; gauging conservation of anions within an external tank; and calculating electrode active area as a function of porosity.

The invention discloses a multi-stage separation type gas-liquid heat exchanger with coupled micro-channel heat pipes and a plate heat exchanger, relates to the technical field of heat exchange devices, is suitable for cooling hot air in air compressor rooms of power plants and the like, and comprises at least two stages of heat exchange devices which are connected in series, the heat exchange device comprises an evaporation mechanism, an ascending pipe, a condensation mechanism and a descending pipe, the evaporation mechanism, the ascending pipe, the condensation mechanism and the descending pipe are sequentially communicated to form heat exchange circulation, and the gas-liquid heat exchanger further comprises a drainage device which is arranged behind the evaporation mechanism and used for sucking high-temperature air to pass through the evaporation mechanism. The problems that in the prior art, a power plant air compressor room is commonly cooled in a traditional forced convection mode, the energy efficiency and the operation cost are too high, and meanwhile the heat exchange effect is not obvious and cannot meet the actual use requirement are solved.

The invention relates to the technical field of copper pipe heat dissipation, in particular to a micro-channel heat dissipation device based on a copper pipe structure, which comprises a heat dissipation substrate, a copper pipe type heat dissipation channel and a liquid cooling circulation system, the copper pipe type heat dissipation channel is composed of a plurality of plastic copper pipes and replaces a traditional micro-channel or vapor chamber structure. The copper pipe is embedded or fixed in the heat dissipation substrate or on the surface of the heat dissipation substrate, cooling liquid circulates in the copper pipe, and efficient heat dissipation is achieved through the combined action of forced convection heat exchange and heat transfer; the copper pipe has good plasticity and can be subjected to three-dimensional bending forming according to heat source distribution and spatial layout, through the synergistic effect of forced convection and phase change heat transfer, the heat transfer efficiency is improved, particularly, extremely high local heat flow density can be coped, the chip is effectively prevented from being overheated, and the heat transfer efficiency is improved. The heat dissipation channel can be bent and formed in a three-dimensional space according to heat source distribution, accurate matching with the heat source form is achieved, limitation of traditional plane heat dissipation is broken through, and optimal configuration of heat dissipation capacity and heat flux density is achieved.

The invention discloses mechanical part laser cutting machining equipment, and relates to the technical field of mechanical part machining. The device comprises a rack, a mounting plate is fixedly connected to the front face of the rack, and a laser cutting machine is fixedly connected to the bottom of the mounting plate; a protection mechanism is arranged on the front face of the laser cutting machine. A gear set is linked with a rotating shaft to drive the protective cover to be opened and closed stably, a guide column is matched with a sliding frame to enable the protective cover to move outwards to avoid collision, an extension rod compresses a spring for buffering during closing, meanwhile, an inner side cleaning pad makes contact friction with the laser cutting head, smoke residues are automatically removed, the cutting head is kept clean, the cutting precision is improved, and the service life of equipment is prolonged. The direction of the fan is intelligently switched along with the state of the protective cover, the protective cover is semi-opened during cutting, the fan obliquely adsorbs smoke dust in a cutting area, interference is avoided, the fan is vertically upward during closing, the fan cooperates with the heat conduction plate and the cooling fins to form a forced convection air channel, heat dissipation is accelerated, and the problems of cutting smoke dust pollution and equipment overheating are solved.

The invention relates to interdigitated flow-fields with tailored header for uniform distribution of electrolyte in redox flow batteries. The design of a flow-field using the concept of interdigitated distribution between the flow-channels is adopted. A tailored inlet header in the interdigitated flow-field with associated design of the flow-channel configuration to obtain desired distribution of electrolyte at minimal pressure drop. This interdigitated flow-field differs from conventional flow-field patterns by having inlet of fluid to entrance channel but the exit through the adjacent exit channel which is interdigitated with the entrance channel. The transport of fluid from entrance channel to exit channel occurs by forced convection through the electrode under a solid rib which exists between the entrance and exit channels. The entrance and exit channels are extended between a common supply manifold and common exhaust manifold or a common inlet header and common outlet header.

The invention relates to an operation method of a shell and tube heat exchanger for an organic Rankine cycle. A refrigerant is input into the cylinder through the liquid inlet connecting pipe and sequentially flows through the preheating area, the evaporation area and the overheating area. A high-temperature heat source enters from the water inlet chamber, sequentially flows through the evaporation area heat exchange pipe, the overheating area heat exchange pipe, the water return chamber and the preheating area heat exchange pipe and then is discharged from the water outlet chamber, and a reverse pure countercurrent flow heat exchange path is formed. In the preheating area, a refrigerant is preheated through a condensation heat exchange pipe of an inner-tooth outer-fin structure, and forced convection is formed by means of a baffle plate until the saturated evaporation temperature is reached; in the evaporation area, the refrigerant absorbs heat and is gasified in the evaporation heat exchange pipes on the outer surfaces of the micropores and the inner walls of the threads; and in the overheating area, refrigerant gas is subjected to overheating treatment through the heat exchange pipe with the reinforced turbulent flow structure, flows circuitously through the baffle plate and then is output to the expansion machine through the gas outlet connecting pipe. According to the method, preheating, evaporation and overheating functions are integrated in single equipment, and the heat exchange efficiency is improved and the system complexity is reduced by optimizing a heat exchange tube structure and a flow path in a partitioned manner.

A comprehensive climate adaptability permafrost subgrade hydrothermal regulation system is provided. The system includes a wind-driven forced convection cooling plate, a wind-driven device, a thermal insulation layer and a capillary blocking covering layer, where the wind-driven forced convection cooling plate is laid at a bottom of a subgrade, and a slender channel is arranged in the plate; the wind-driven device is connected with the slender channel in the wind-driven forced convection cooling plate, and a liquid working medium is driven to flow in the slender channel by a pump; the thermal insulation layer is laid on an upper part of the wind-driven forced convection cooling plate; and the capillary blocking covering layer is laid on a slope.

The utility model belongs to the technical field of tank car transportation, and particularly relates to a train tank forced raw material circulation heating device which comprises a telescopic guide mechanism, a machine pump is installed on the upper surface of the telescopic guide mechanism, and a hose connecting part is arranged on the lower surface of the telescopic guide mechanism. A feeding hose connected with an inlet of the pump and a discharging hose connected with an outlet of the pump are arranged in the hose connecting part, a feeding pipe and a discharging pipe are arranged below the hose connecting part, and the upper end of the feeding pipe extends into the hose connecting part and is connected with the feeding hose; the upper end of the discharging pipe movably extends into the hose connecting part and is connected with the discharging hose; a telescopic air cylinder is arranged in the hose connecting part, and an air cylinder rod of the telescopic air cylinder is fixedly connected with the discharging pipe. According to the heating device in the technical scheme, the heated medium in the train tank is forcibly conveyed to the low-temperature part of the train tank through the pump, so that the purpose of forced convection heat exchange is achieved, and the purpose of rapidly heating the medium in the train tank is achieved.

The utility model discloses a waterproof VR device with a heat dissipation function, which relates to the technical field of VR devices and comprises a middle shell and a battery. Heat dissipation holes are formed in the front side face and the rear side face of the middle shell, a rear cover is clamped to the bottom end of the middle shell, a lens barrel support is installed in the middle of the rear cover, a circuit board is placed on the front side of the top face of the lens barrel support, the battery is fixed to the top face of the lens barrel support, a fan is installed on the top face in the middle shell, and an upper cover is arranged on the top face of the middle shell. A sealing unit is mounted on the top surface of the middle shell; according to the waterproof VR equipment with the heat dissipation function, the middle shell, the upper cover and the rear cover are installed through dispensing, so that an electric device is sealed, liquid is prevented from entering the VR equipment to cause damage to the VR equipment, meanwhile, heat in the middle shell is guided out through the heat dissipation fins, the fan is started to continuously carry out forced convection heat dissipation to the outside, and the heat dissipation efficiency is improved. And the spring is matched with the sealing plate to prevent liquid from entering through the heat dissipation holes.