391 results about "Heat leakage" patented technology

The invention discloses a liquid hydrogen container heat leakage prediction and boost characteristic detection method and system. The method comprises the following steps: establishing a three-dimensional heat flow field model of a liquid hydrogen container; calculating the heat flow density of a gas-liquid interface based on the three-dimensional heat flow field model so as to adjust the liquid hydrogen evaporation capacity; total heat leakage is obtained through finite element simulation and experimental data collaborative calibration; calculating a static evaporation rate according to the total heat leakage; establishing a nonlinear mapping model of the static evaporation rate and the boost rate through a response surface regression method; the wall temperature distribution of the liquid hydrogen container is monitored in real time, thermophysical parameters are calibrated through the LSTM neural network by adopting a dynamic calibration algorithm, and the output result of the three-dimensional heat flow field model is corrected. By establishing a three-dimensional heat flow field model of the liquid hydrogen container, determining a nonlinear response relationship between the evaporation rate and the pressure rising rate of the liquid hydrogen container, and constructing a cloud-edge collaborative detection system, the heat leakage performance of the liquid hydrogen container is accurately predicted, and efficient pressure rising rate detection is realized.

The invention discloses an inverted 2K liquid-helium-free low-temperature probe station based on a GM refrigerating machine. The inverted 2K liquid-helium-free low-temperature probe station comprises a 2K plate, a vacuum cavity, a refrigerating system and a heat insulation assembly. The refrigerating system comprises a GM refrigerating machine, a thermal switch and a helium circulating system, and the GM refrigerating machine adopts a two-stage GM refrigerating machine, is inverted and extends into the vacuum cavity; the helium circulation system comprises a superflow helium pool installed at the bottom of the 2K plate, the helium circulation system takes away the cooling capacity of the refrigerating machine through circulation helium, the temperature is further reduced through throttling cooling and evacuation pressure reduction, and a 2K low-temperature environment is achieved at the 2K plate. The thermal switch provides cooling capacity for the 2K plate during initial operation so as to realize cooling; the heat insulation assembly comprises multiple stages of heat radiation screens and is used for reducing radiation heat leakage to the vacuum cavity. The 2K plate layout with the 2K plate temperature lower than 2K and the upward direction can be provided, and extra refrigerating working media such as liquid helium are not consumed.

The invention discloses a through-type heat exchanger for controlling heat leakage between different last cold stages of a dilution refrigerator and a manufacturing method, and particularly relates to the technical field of refrigeration and low-temperature engineering, the through-type heat exchanger comprises an inlet connecting pipe, an annular upper sealing plate, a heat exchanger shell, an annular lower sealing plate, an outlet connecting pipe and a metal sintering body, an inner wall face fixing step is fixedly arranged on the inner wall of the heat exchanger shell, the inner wall face fixing step is close to an opening in the bottom end of the heat exchanger shell, the metal sintering body is arranged in the heat exchanger shell and is tightly matched with the heat exchanger shell, and the length of the metal sintering body is slightly smaller than that of the heat exchanger shell. By arranging the metal sintering body, the heat exchange area is increased to the maximum extent within the limited volume, the porosity and the specific surface area of the metal sintering body are reasonably set, and therefore stable flowing and diffusion of the helium-3 / helium-4 mixed working medium are achieved.

An automobile thermal management system comprises a refrigerant circulating system, a cabin cooling liquid circulating system and a passenger cabin cooling liquid circulating system which are connected with one another, a four-way reversing valve component is adopted in an agent side module or assembly, and a water path system is simplified while the agent side loop reversing function is achieved through a plate heat exchanger; compared with the prior art, the number of the water valves is greatly reduced, so that high quality risks such as inner leakage, heat leakage and high mode switching frequency caused by the quality of the water valves are reduced, and the quality risks are greatly reduced after the water valves are simplified.

A liquid hydrogen storage tank capable of eliminating thermal stratification with low turbulence relates to the field of liquid hydrogen storage and comprises a tank body and a spray rod mechanism arranged in the tank body, the spray rod mechanism is communicated with a liquid hydrogen circulation pipeline, and liquid hydrogen in the tank body is extracted by the liquid hydrogen circulation pipeline and sprayed to a heat leakage point through the spray rod mechanism. The spray rod mechanism comprises a main guide pipe and a plurality of branch guide pipes, the tail ends of the branch guide pipes are provided with distribution assemblies attached to the heat leakage points, and the distribution assemblies are of structures defined by elastic metal wire meshes and filled with porous media, so that liquid hydrogen is dispersed and sprayed to the heat leakage points through the porous media, and turbulence of the liquid hydrogen is reduced. The spray rod mechanism is arranged in the storage tank, and the liquid hydrogen is directly sprayed to the heat leakage point by utilizing the guide pipe and the distribution component of the spray rod mechanism, so that turbulence of the liquid hydrogen in the tank is reduced, and evaporation of the liquid hydrogen caused by heat leakage is slowed down.

The invention relates to the technical field of low-temperature valve testing, in particular to low-temperature valve heat leakage testing equipment and method.The equipment comprises a double-chamber container internally provided with a testing chamber and a storage tank chamber which are isolated, a liquid nitrogen storage tank is located in the storage tank chamber and connected with a blow-down pipe and a liquid inlet pipe which penetrate out of the storage tank chamber, and the liquid nitrogen storage tank is connected with a liquid outlet pipe; the test air inlet pipe is communicated with a valve to be tested or a replacement pipeline; the evaporation measurement device is communicated with the test gas outlet pipe and the liquid nitrogen storage tank, the test gas outlet pipe is located in the test cavity and used for being communicated with a valve to be tested or a replacement pipeline, and the evaporation measurement device is used for measuring the evaporation capacity of liquid nitrogen; the vacuum generating device is communicated with the testing chamber and the storage tank chamber through a vacuumizing pipe, and the vacuum degree of the testing chamber and the vacuum degree of the storage tank chamber are independently controlled. The device effectively eliminates the influence of heat leakage of the device and environmental factors, achieves the accurate testing of the heat leakage of the low-temperature valve, achieves the more accurate evaluation of the performance of the valve, and is suitable for the performance evaluation scene of a cryogenic medium valve.

The utility model relates to a cold shield of a low-temperature container. Comprising a barrel and a plurality of supporting assemblies. The barrel is arranged between the inner shell and the outer shell in a sleeving manner; the inner shell is used for containing a low-temperature medium, and vacuum is formed between the inner shell and the outer shell; each supporting assembly is arranged on the outer wall of the cylinder body; each supporting assembly comprises a bolt, two gaskets, a locking nut and a cylinder, a groove is formed in one end of each cylinder, and an internal thread is arranged in each groove; the wall face of the barrel is provided with through holes which correspond to the supporting assemblies one to one and allow the corresponding bolts to penetrate through, the two gaskets are arranged on the two sides of the wall face of the barrel respectively and fixed through the bolts and the locking nuts, and the cylinders are installed at the outer ends of the bolts in a screwed mode through the internal threads. The outer end of the bolt faces the side where the shell is located. The fixing structure is firm in fixing and low in heat leakage rate.

The utility model discloses a sealing heat preservation structure of a bridge type furnace body, the bridge type furnace body is formed by splicing a plurality of heat preservation plates, a splicing position is arranged between every two spliced heat preservation plates, and the sealing heat preservation structure of the bridge type furnace body comprises sealing cotton and a strut angle plate; the sealing cotton is laid on the side, facing the interior of the bridge type furnace body, of the splicing position and the side, back to the interior of the bridge type furnace body, of the splicing position so as to fill or cover a gap of the splicing position, and a blocking part is formed. The strut angle plate is arranged on the outer side of the blocking part and fixedly connected with the heat preservation plate so as to tightly press the sealing cotton. According to the bridge type furnace body, the sealing cotton is creatively laid at the splicing position of the heat preservation plates, the sealing cotton is tightly pressed and fixed through the angle supporting plates, gaps at the splicing position are sealed, heat in the bridge type furnace body is prevented from escaping through the gaps at the splicing position, and the problem of heat leakage of the bridge type furnace body is effectively solved.

The invention discloses a high-safety variable-temperature circulating temperature control system, which adopts a regenerative closed circulating structure design, main pipelines of a cold source unit and a distribution unit are respectively placed in a valve box, and the interior of the valve box is evacuated to form a vacuum environment, so that the convective heat exchange of residual gas molecules in the pipelines is reduced, the heat leakage of a low-temperature working medium is reduced, and the safety of the low-temperature working medium is improved. The pipeline temperature difference is reduced; furthermore, the system is provided with an independent nitrogen supplementing device and a nitrogen loop used for target disc temperature returning, automatic adjustment of a nitrogen working medium in the system is achieved, it is guaranteed that the nitrogen working medium stably circulates in the closed system, cold energy recovery and energy-saving utilization are achieved to the maximum extent, and therefore high-safety operation of the system is guaranteed through multi-linkage gas path control.

The invention belongs to the technical field of air conditioners, and relates to a defrosting control method and device, a medium and electronic equipment. The method comprises the steps that environment parameters of air conditioner operation are obtained, and the environment parameters reflect the environment load of the air conditioner; and according to the environment parameters, target defrosting modes of the air conditioner are determined for defrosting, wherein the target defrosting modes comprise the reverse circulation defrosting mode and the shock cooling prevention defrosting mode. The corresponding target defrosting mode is selected for defrosting on the basis of the environment parameters reflecting the environment load. The reverse circulation defrosting mode can be selected under the condition that the requirement for defrosting is high, the reliability of the defrosting effect is improved so that the reverse circulation defrosting mode can be suitable for application scenes with severe weather or serious heat leakage conditions, the shock cooling prevention defrosting mode can be selected under the condition that the requirement for indoor comfort is high, the influence of slow temperature rising caused by defrosting is reduced, and the defrosting effect is improved. And the indoor temperature rising efficiency and the user experience in the defrosting period are improved.

The invention relates to a multistage coaxial nested cold shield structure for a dilution refrigerator, and relates to the technical field of refrigeration and low-temperature engineering, the multistage coaxial nested cold shield structure comprises a Dewar, the top of the Dewar is provided with a top plate in a sealing manner, and the Dewar is internally provided with a first-stage cold shield, a second-stage cold shield, a third-stage cold shield and a fourth-stage cold shield; the first-stage cold screen, the second-stage cold screen, the third-stage cold screen and the fourth-stage cold screen are coaxially arranged in a nested mode from outside to inside and from bottom to top, and the side walls of the first-stage cold screen, the second-stage cold screen, the third-stage cold screen and the fourth-stage cold screen are each provided with a plating layer and a heat insulation layer. The invention aims to gradually intercept radiation heat flow, minimize radiation heat loss of a low-temperature end, form a graded radiation heat flow barrier in a vacuum cavity of the dilution refrigerator, reduce heat leakage loss of each stage of structural component and guarantee efficient operation of dilution refrigeration cycle, and has the remarkable advantages of strong shielding effect, good thermal coupling with a system, compact structure and the like; and important positive significance is achieved for practical development of the dilution refrigerator.

The invention relates to the technical field of deep space exploration, in particular to a cryogenic propellant on-orbit low-loss storage system and method for a deep space probe. After the low-temperature propellant is injected into the storage tank through the injection pipe, along with continuous accumulation of external leaked heat, the first pressure sensor detects that the pressure in the storage tank is continuously increased, and when the numerical value of the first pressure sensor exceeds the preset pressure, the cooling assembly is started to cool the low-temperature propellant in the storage tank, so that the external leaked heat is consumed; before the engine needs to supply the low-temperature propellant, the low-temperature propellant in the storage tank is in a supercritical state, and the storage temperature is increased in a high-pressure storage mode, so that the temperature difference between the storage tank and the outside and the heat leakage amount are reduced, and the requirement for the refrigerating capacity of the cooling assembly is reduced; when the low-temperature propellant is conveyed, due to the fact that the low-temperature propellant is in a supercritical state and free of gas-liquid phase separation, the interior of the whole storage box is in a homogeneous state, the stable conveying flow of the low-temperature propellant can be guaranteed, and stable output of an engine is also facilitated.

The invention relates to the technical field of spacecraft thermal control, and discloses a self-adaptive thermal control system based on pump-driven two-phase flow and thermochromism cooperative regulation, and the system is dynamically coupled with a thermal switch and a thermochromism coating through a pump-driven two-phase flow loop to realize autonomous bidirectional regulation of a thermal environment in a spacecraft. When heat dissipation is needed in the cabin, the pump drives the two-phase flow to start, the temperature of the condenser rises to enable the bottom thermal switch to expand, the condensation plate is pushed to be in contact with the radiation heat dissipation plate to transfer heat, meanwhile, the thermochromic coating is heated to be in a high infrared emissivity state, and an active heat dissipation channel is constructed. And when heat dissipation is not needed, the temperature of the condenser is reduced, the thermal switch shrinks and resets, the condensation plate is separated from the radiation heat dissipation plate, the thermochromism coating recovers the low-emissivity state, and double blocking of physical isolation and radiation suppression of the heat dissipation channel is achieved. The contradiction between passive heat leakage and active power consumption of a traditional thermal control system can be solved, and the environmental adaptability and the energy utilization efficiency of a spacecraft thermal management system are improved.

The invention discloses a method and system for evaluating the demand response capability of a solid heat storage cluster for building heat supply. The method comprises the steps that S1, the heat supply area and the heat supply time of a heat consumer and voltage, current and heat storage body temperature information collected by solid heat storage through a measuring device are obtained; s2, heat loads in the same heat supply network are aggregated and superposed, a total heat load curve is calculated, and a heat supply curve of each solid heat storage unit is formulated according to the solid heat storage capacity in a weighted mode; s3, the dynamic model can calculate the heating capacity and the heat output and heat leakage according to the energy conservation principle by combining the heat load curve of the solid heat storage, and the temperature state of the heat storage body at the future moment is calculated; and S4, calculating the demand response capability under step-by-step power regulation according to the temperature state and the constraint condition of the heat accumulator. By the adoption of the technical scheme, the problem that in an existing heat supply station, a corresponding capability evaluation method is lacked when the solid heat storage cluster participates in demand response is solved.

The invention relates to the technical field of cables, in particular to a production method of a low-temperature superconductive low-heat-leakage superfine coaxial cable, the outer diameter of the coaxial cable is smaller than or equal to 1.5 mm, and the cable is provided with a core material, a first superconductive layer, a PTFE dielectric layer, a second superconductive layer and a stainless steel pipe from inside to outside; the production method comprises the following steps: coating the periphery of the core material with the first superconducting layer to prepare the inner conductor; coating the periphery of the inner conductor with a PTFE layer to form a medium wire core; longitudinally penetrating the strip-shaped second superconducting layer through a round hole mold with the inner diameter gradually reduced, and rolling into a hollow pipe with the outer diameter slightly smaller than the inner diameter of the stainless steel pipe; and synchronously pulling the hollow pipe into the stainless steel pipe, pulling the medium wire core into the hollow pipe in the stainless steel pipe, and completing cable assembly. Pulling the cable through a round hole die with the inner diameter smaller than the outer diameter of the stainless steel pipe for reducing extrusion; in inert gas or high vacuum, the internal stress of the cable is released through heating. The second superconducting layer lining is longitudinally covered in the stainless steel tube, so that the problem that the inner wall of the extremely long and thin tube is difficult to uniformly plate the superconducting layer is solved.

The invention discloses a film type liquefied natural gas composite enclosure structure which comprises a main screen wall, a main shielding layer, a composite secondary screen wall and a secondary shielding layer which are connected layer by layer, the main shielding layer and the secondary shielding layer are made of first porous materials, and the first porous materials of the main shielding layer and the secondary shielding layer are connected with plywood respectively. The main shielding layer, the composite secondary shielding wall and the secondary shielding layer are connected through low-temperature glue, the main shielding wall is a corrugated metal plate, a plywood of the main shielding layer is pasted with a non-metal connecting piece, and the non-metal connecting piece is connected with the corrugated metal plate through the low-temperature glue. The invention further provides an assembly method of the thin film type liquefied natural gas composite enclosure structure. The strength of the enclosure structure is improved, heat conduction and heat leakage of the connecting pieces are reduced, and the construction difficulty is lowered.

The invention provides a thermal management system and a vehicle. The thermal management system comprises a battery flow path, an electric drive flow path, an expansion kettle and a switching valve. The battery flow path includes a battery fluid pump. The electric drive flow path comprises an electric drive liquid pump. The expansion kettle comprises a first liquid supplementing opening and a second liquid supplementing opening which are communicated. When the switching valve is in a first state, the battery flow path is communicated with the electric drive flow path, so that a first cooling liquid loop flowing through the battery flow path and the expansion kettle and a second cooling liquid loop flowing through the electric drive flow path and the expansion kettle are formed. And the battery liquid pump is used for realizing circulating flow of the cooling liquid in the first cooling liquid loop. And the electric drive liquid pump is used for realizing circulating flow of the cooling liquid in the second cooling liquid loop. When the switching valve is in the second state, the battery flow path is separated from the electric drive flow path, and the expansion kettle is used for supplementing water to the battery liquid pump and the electric drive liquid pump through the first liquid supplementing opening and the second liquid supplementing opening respectively. Therefore, the heat leakage amount of the heat management system is reduced.

The furnace door control structure comprises a furnace door opening and closing assembly for controlling a furnace door to move relative to a furnace opening, so that the furnace opening is opened or closed; the furnace door opening and closing assembly is connected with the furnace door through a plurality of fine adjustment assemblies of the furnace door, each fine adjustment assembly comprises a rotating part connected with the furnace door and a positioning part connected with the furnace door opening and closing assembly, and the positioning parts and the rotating parts are controlled by adjusting parts to rotate relatively around a rotating shaft. And the angle of the furnace door can be adjusted in multiple directions relative to the furnace opening. The invention provides a furnace door control structure with multi-stage adjustment and accurate positioning functions to solve the problems that in existing PECVD equipment, fitting precision of a furnace door and a furnace opening is insufficient, sealing performance is poor, and heat is prone to leakage. According to the structure, the furnace door can open or close the furnace mouth through the furnace door opening and closing assembly, and the furnace door can be subjected to micron-order posture correction in a three-dimensional space by combining multi-dimensional angle adjustment of the fine adjustment assembly, so that the fitting precision of the furnace door and the edge of the furnace mouth is remarkably improved.

The application discloses a kind of satellite-borne infrared emissivity differential measurement method and device using cold black background, belong to spacecraft thermal control and material on-orbit testing technical field, purpose is to eliminate environmental stray radiation and conduction heat leakage interference, realize material emissivity high-precision in-situ on-orbit test.The application relies on deep space cold black environment and differential disturbance thought, supporting layout emissivity known standard unit and unit to be measured, make two in consistent light thermal condition, respectively establish transient heat balance equation.Because two kinds of units are consistent, such as common-mode interference of stray radiation, conduction heat leakage, two formula difference can be removed interference term, only keep and emissivity related radiation heat loss term.Through the design of different thermal control conditions (such as balance heating, constant temperature control, dynamic heating), the real emissivity of the material to be measured is solved.The application is suitable for in-situ, high-precision measurement of the infrared emissivity of spacecraft surface materials, especially intelligent thermal control materials such as thermochromic materials in space environment.

The utility model belongs to the technical field of electric heating, and particularly relates to a heating layer structure, which comprises a base material, an electric heating layer and a heat insulation layer, the electric heating layer is externally connected with a power supply for electrifying and heating, the base material is arranged above the electric heating layer and used for contacting materials to be heated, and the heat insulation layer is arranged below the electric heating layer and used for reducing heat leakage. And the heat insulation layer is arranged at the bottom of the electric heating layer, so that the loss of downward transfer of heat of the electric heating layer is effectively reduced, the heat can be concentrated on the electric heating layer and a substrate area above the electric heating layer, and the use efficiency of overall energy is improved. The heat conduction efficiency is improved, so that the temperature can be quickly increased or decreased in a short time, and the requirement of equipment needing to quickly adjust the temperature is met; therefore, the thickness of the whole structure can be reduced, the light and space-saving requirements are met, and the structure is suitable for the fields of electric appliances, electronic products, heating pads and the like.

The application relates to the technical field of spacecraft thermal control, and particularly provides a spacecraft multilayer heat insulation assembly thermal bridge suppression type bolt fixing structure which comprises a fixing assembly, a heat insulation bushing, a first heat insulation gasket, a second heat insulation gasket, a multilayer heat insulation assembly and a structural member; a stud passes through the second heat insulation gasket, the structural member and the multilayer heat insulation assembly in sequence; the outer surface of the stud is covered with the heat insulation bushing; the heat insulation bushing is a gradient functional composite structure; the heat insulation bushing comprises, from inside to outside, a heat insulation damping layer, a heat reflection layer and a structural enhancement radiation resistance layer; the contact surface between the second heat insulation gasket and the structural member is provided with a micro-cone array structure; the contact surface between the first heat insulation gasket and the top of the heat insulation bushing is provided with a micro-cone array structure; and the micro-cone array structure is used for filling assembly gaps and reducing solid heat conduction. The application has the advantages of low heat leakage, strong space adaptability and high thermal resistance stability.

The present invention is applicable to the field of liquid hydrogen transportation, and discloses a cryogenic joint, which includes a heat-insulating pipe, a core body, and a fastener. The heat-insulating pipe includes a first component and a second component with the same structure. The first component includes a first inner pipe, a first outer pipe, and a flange provided at one end of the first component. The flange extends outward from the first inner pipe and protrudes from the first outer pipe. The core body includes two guiding blocks, a sealing block, a second inner pipe, and a second outer pipe. The two guiding blocks are respectively installed at the two ends on both sides of the second outer pipe. The sealing block is arranged around the outer circumference of the second outer pipe. A second vacuum chamber is formed between the second inner pipe and the second outer pipe. Core body end caps for closing the second vacuum chamber are provided at both ends of the second inner pipe. The core body is assembled inside the heat-insulating pipe. The flanges of the first component and the second component of the heat-insulating pipe are clamped on both sides of the sealing block. The first component and the second component are connected by a fastener. This cryogenic joint can achieve rapid connection of liquid hydrogen transmission pipelines and low heat leakage and low-loss liquid hydrogen transportation.

The present invention relates to a multi-connected high-temperature superconducting magnet based on ReBCO-coated superconducting sheets that can simultaneously generate multiple magnetic induction intensities. The superconducting magnet is formed by alternately stacking and fixing one or more sets of superconducting ring sheets and insulating sheets. Several connected circular ring structures with successively decreasing radii are cut out on the superconducting sheets and insulating sheets, and the circular ring structures at corresponding positions have the same size. The present invention adopts a superconducting sheet stacking method, eliminating the bending and winding steps to reduce the impact on the performance of the superconducting tape; at the same time, the device adopts the existing "field cooling method" for excitation, without the need for welding, power supply and current leads, reducing operating costs and heat leakage, and has the advantages of compact structure, detachability, high stability and simple preparation process; it can stably output multiple stable magnetic fields with different magnetic induction intensities, expanding the scope of application of ReBCO superconductors in magnets, and can also be applied to application scenarios such as medium and large superconducting magnets.

The present invention discloses a low heat leakage thin film composite ribbon line structure and a design method for cryogenic packaging. The low heat leakage thin film composite ribbon line structure for cryogenic packaging of the present invention is composed of a type A lead merged conductive layer, a type A lead conductive layer, a film coating layer, via holes, a type B lead conductive layer, a type B lead merged conductive layer, a bonding wire finger layer, a strengthening layer, a gold layer, and a soldering pad gold plating layer. The present invention systematically expounds the design principles and implementation methods of the low heat leakage thin film composite ribbon line structure, materials, electricity, heat, etc., and obtains a low heat leakage thin film composite ribbon line assembly. The present invention adopts a multi-layer composite structure compatible with the ordinary flexible cable process. On the premise of ensuring performance matching with the detector, low thermal conductivity alloys, multi-layer structure lead merging, and specific surface treatment are used to reduce the heat leakage of the leads and solve the reliability problems brought by high-density leads.

The utility model belongs to the field of dust removal, and particularly relates to a tubular electric heater capable of being overhauled on line, which comprises a heater seat, a rock wool box is clamped in the heater seat, and a rock wool filler is placed in an accommodating cavity of the rock wool box; the positioning nut and the heater base are attached to the equipment installation end face, during installation, the positioning nut is installed on the equipment end face, the tightening latch is screwed into the positioning nut, a vertical guide structure is formed, the rock wool box is assisted to be placed in an inner cavity of the heater base, and the electric heating mechanism can be fixedly installed through threaded connection of the limiting nut and the tightening latch. And the heater base and the rock wool box form a sealing mechanism with a reserved opening only facing the equipment mounting end face, the air heat insulation layer is clamped between the electric heating pipe and the rock wool box, heat absorption and heat preservation are conducted in cooperation with the rock wool box and rock wool filler in the rock wool box, heat leakage is prevented, and the equipment heating effect is improved.

The utility model relates to the technical field of floor laminating equipment, in particular to a double-layer compacting machine for a plastic-wood composite floor, which reduces heat leakage during hot pressing and improves production efficiency by arranging a hot pressing table, and enables the lower surface of the floor to be uniformly stressed during hot pressing and improves product quality by arranging the hot pressing table. By arranging the separation conveying device, the feeding device, the first guide block, the second guide block and the discharging device, the floors are precisely limited during feeding, the hot pressing accuracy is improved, and the product quality is improved; comprising a body; the machine further comprises a separating and conveying device, a feeding device, a hot-pressing device and a discharging device, and the separating and conveying device, the feeding device, the hot-pressing device and the discharging device are all installed on the machine body. The machine body provides support, the separating and conveying device separates and conveys floors, the feeding device feeds the floors, the hot-pressing device conducts hot-pressing on the floors, and the discharging device limits the positions of the floors.

A system and method for minimizing thermal leakage to a liquid cryogenic agent pump incorporating a bayonet, the system and method including a male bayonet portion received in a female bayonet portion, the female bayonet portion and the male bayonet portion each have a circular cross-section and include an outer tube surrounding an inner tube, and an annular space under vacuum between the inner tube and the outer tube, where a liquid cryogenic agent pump is contained within the interior of the male bayonet portions.

The present invention discloses a longitudinal support device for a large-capacity railway cryogenic tank car. The longitudinal support device connects an inner head and an outer head and is located at the center of the inner and outer heads. The longitudinal support device includes a support flange, a longitudinal tensile bearing frame, a heat insulation component, and a longitudinal push-pull support seat. The present invention can avoid opening a mounting hole in the head of the tank body, thereby maintaining the integrity of the inner head. The longitudinal support device is located at the center of the head on one side of the tank body. When subjected to a longitudinal load of 2500KN in the second railway working condition, the inner and outer tank bodies are subjected to more uniform force in the axial direction. The longitudinal support device effectively reduces heat leakage from the cryogenic tank body and improves the thermal insulation performance of the cryogenic tank body.

The invention relates to an online diagnosis and early warning method for performance degradation of a multi-layer thermal insulation material in a liquid hydrogen temperature zone, and belongs to the technical field of extremely low temperature thermal insulation material testing. According to the method, an acoustic sensing module and a controllable micro excitation module are integrated on a traditional heat leakage testing system; the method comprises the following steps: collecting acoustic emission signals generated by a material under thermal cycle and active micro-excitation, extracting multi-dimensional characteristic parameters, and establishing a correlation diagnosis model of acoustic emission characteristics and the internal pre-tightening force state and macroscopic thermal performance of the material in combination with standard sample data in a known state; by utilizing the model, the internal mechanical contact state of the to-be-tested material can be evaluated in an online, lossless and real-time manner, and early warning can be performed on the degradation trend of the heat insulation performance of the to-be-tested material. According to the method, the defects of lagging and destructiveness of a traditional testing method are overcome, the root cause of performance degradation is monitored, and a guarantee is provided for reliability evaluation and service life prediction of the material.

The application discloses a kind of high-efficiency heat-proof load integrated sandwich composite structures, including metal outer panel, intermediate sandwich layer and metal inner panel, intermediate sandwich layer includes heat insulation material layer, phase change material layer and core rod, heat insulation material layer is relatively phase change material layer and is outside, core rod passes through heat insulation material layer and phase change material layer, the inner and outer ends of core rod are connected with metal outer panel and metal inner panel respectively.The beneficial effects of the present application are: the orthogonal M-type rod structure design is used in the intermediate sandwich layer, which not only has the force transmission and strain isolation function of the inner and outer layers, but also greatly prolongs the heat conduction path from the outer panel to the inner panel, effectively alleviating the heat short circuit problem, and the phase change material layer is used to absorb the heat leakage of the sandwich layer rod, thereby further improving the heat-proof performance of the sandwich composite structure.