593results about How to "Reduce thermal contact resistance" patented technology

An ultra-thin heat pipe comprises a flat metal tube and one or more sintered powder portions. The flat metal tube has an upper tube wall, a lower tube wall and two lateral walls connecting with the upper tube wall and the lower tube wall. The sintered powder portions extends axially and are formed on an inner face of at least one of the upper tube wall, the lower tube wall and the lateral walls such that vapor passage space is formed at one or more sides of the sintered powder portions.

The invention relates to a heat conductive phase-change material which consists of the following components in percentage by weight: 75-90% of heat conductive filler, 2-8% of low-melting-point solid resin, 5-15% of liquid resin, 0.01-1% of an antioxidant and 0.02-2% of a coupling agent, and the phase-change material is prepared through a production method of mixing raw materials, mixing the heat conductive filler, pressing and forming, and cooling. The heat conductive phase-change material, which is prepared by mixing the heat conductive filler, the low-melting-point solid resin, the liquid resin, the antioxidant and the coupling agent, disclosed by the invention has the advantages that the phase-change material is in a shape of flaky solid at room temperature, so that the material is convenient in using and operation and can be directly attached on the surface of a heat-radiating component; when the component runs to the working temperature of the heat conductive phase-change material, phase change occurs and the material becomes soft, so as to wet the surface of the component to a great extent, and contact thermal resistance is reduced to the lowest so as to guarantee a heat conductive interstitial property better than that of heat conductive grease or a graphite flake; in addition, with excellent thixotropy, the material, when being used in a vertical direction, is protected away from circumstance of overflow or flowing.

The invention relates to a flat-panel vapor chamber which belongs to a heat radiating device of a micro electronic device and is used for heat diffusion of a power module and solving the surface deformation problem of the traditional flat-panel vapor chamber and a heat source contact surface so as to further reduce the deformation with the contact surface of a heat source part. The flat-panel vapor chamber comprises heat radiating fins and a metal cavity, wherein the metal cavity consists of a box body and a cover plate; the metal cavity is internally pumped with vacuum and filled with liquid working medium; the box body and the heat radiating fins are tightly contacted or connected into a whole; the inner wall surface of the box body is provided with capillary cores, and supporting bodies are arranged between the box body and the cover plate; the central part of the inner wall surface of the cover plate is provided with a boss, and the thickness of the boss is 0.2-2.0mm; the cross section area of the boss is larger than or equal to the contact area of the heat source; and the inner wall surface of the cover plate including the boss is provided with capillary cores. The flat-panel vapor chamber has the advantages of simple structure and convenience for manufacturing and processing, can be used for effectively reducing the surface deformation and the contact heat resistance, and has high working medium refluxing efficiency and higher working efficiency.

The invention provides phase-change heat-conducting silicone grease and a preparation method thereof. The phase-change heat-conducting silicone grease is prepared from organic silicone oil, phase-change capsules, heat-conducting filler and an assistant. The invention also provides the preparation method of the phase-change heat-conducting silicone grease. The preparation method comprises the following steps: preparation of modified heat-conducting filler, preparation of a raw-material mixture, vacuum stirring treatment and the like. The phase-change heat-conducting silicone grease prepared bythe method has the beneficial effects that the fluidity and the wettability are good, the service life is long, the compatibility between the heat-conducting filler and the silicone oil is good, the heat-storage function is achieved, the interfacial thermal contact resistance of nodes and a radiating device of a high-power electrical appliance can be effectively reduced, and the heat transfer canbe accelerated; the preparation process is simple, the cost performance is high, and the application is wide.

The invention relates to a method and a device for testing the thermal physical property of a solid material with an independent probe by using a harmonic method. The device comprises the independent probe, a pressure adjusting part, a torque measuring part and a harmonic measuring unit, wherein the independent probe is positioned between two identical samples to be tested to form a sandwich structure and is arranged parallel to a sample fixing table; the pressure adjusting part is positioned and pressed on the upper end face of the first sample to be tested; the sandwich structure is arranged on the sample fixing table; the torque measuring part is sleeved on one end of the pressure adjusting part; the harmonic measuring unit is electrically connected with the independent probe; and a torsion value and contact thermal resistance between the independent probe and the two samples to be tested are fitted and calculated according to a harmonic measurement principle. In the test, the sandwich structure is arranged on a lug boss of the sample fixing table, the pressure adjusting part is adjusted until the torsion value is displayed to be the optimal torsion value, and then the thermal conductivity coefficient and the thermal diffusivity of the sample to be tested are tested by the harmonic method. Differences among thermal conductivity values of the samples to be tested under the condition of a plurality of torsion values smaller than the optimal torsion value are measured and calculated for obtaining the contact thermal resistances between the samples to be tested and the independent probe under the condition of the plurality of torsion values.

A heat dissipation device and a radio frequency module with the same are provided. The heat dissipation device includes a substrate (1). The substrate (1) having a surface where a heat absorbing surface (5) is formed. There are multiple hollow conduits inside the substrate (1) to act as evaporating conduits (6). The heat dissipation device further comprises condensing conduits (7) intercommunicated with the evaporating conduits (6). The evaporating conduits (6) and the condensing conduits (7) form sealed conduits. The sealed conduits are filled with liquid which vaporizes upon heating. At least the evaporating conduits (6) are set in the substrate (1).

The invention discloses a working medium contact cooling system of power batteries. An insulating liquid heat-conducting working medium is contained in a working medium box; a working medium pump sinks into the insulating liquid heat-conducting working medium; a filter is arranged at an inlet of the working medium pump; the working medium pump is connected with a spray main pipe; a plurality of spray branch pipes are connected with the spray main pipe in parallel; each spray branch pipe is provided with a plurality of nozzles; the nozzles are opposite to a high-power battery pack; the spray branch pipes and the spray main pipe form a cage frame; the high-power battery pack is placed in the cage frame; the spray branch pipes are distributed on the side surfaces and the upper part of the high-power battery pack to form a relatively open spray structure; and the insulating liquid heat-conducting working medium is a nonpolar substance and is free of a phase change in the spray process. The invention further provides a working method of the working medium contact cooling system of the power batteries. According to the working medium contact cooling system, the cooling structure is reasonable and the cooling efficiency is high.

The invention discloses a conical slit-type hot end heat exchanger of a coaxial pulse tube refrigerator and a manufacturing method. The heat exchanger structurally consists of a hot end flange, a conical slit and a hot end plug, wherein the conical slit is inserted into the hot end flange in a tight fit way, the radius of a circle of contact on the top of a cone frustum is equal to the radius of a cold accumulator and the radius of the bottom of the cone frustum is equal to the radius of the hot end plug. The hot end plug and the hot end flange not only can be connected through bolts to form a detachable split-type hot end heat exchanger, but also can be hermetically welded to form an integrated hot end radiator. The conical slit-type hot end heat exchanger has the advantages that the structure is simple, compact and high-efficiency, the hot end radiating capacity of the refrigerator can be exerted to the utmost extent and the hot end pressure ratio of the pulse tube refrigerator is increased at the same time. The structure can intensively realize the major functions of a high-efficiency hot end heat exchanger, a hot end gas flow guide device of the pulse tube refrigerator and a hot end gas even distributor of the cold accumulator, and can improve the performance of the entire pulse tube refrigerator to a great extent.

The invention discloses a chip cooling device which comprises a cooling room positioned at the bottom of the device and matched with the chip, a cooling liquid pond stored with cooling liquid, a firstmicro channel, a first micro pump, a second micro channel, a micro nozzle, a third micro channel, a second micro pump, a fourth micro channel, a condenser and a micropore, wherein one end of the first micro pump is communicated with the cooling liquid pond by the first micro channel and the other end is communicated with the micro nozzle by the second micro channel; the micro nozzle is arranged above the cooling room and communicated with the cooling room; one end of the second micro pump is communicated with the cooling room by the third micro channel and the other end is communicated with the condenser by the fourth micro channel; the condenser is positioned above the cooling liquid pond and a condensing channel is arranged in the interior of the condenser; and a radiating fin is arranged on the top of the condensing channel which is communicated with the cooling liquid pond by the micropore. The chip cooling device has small volume, high heat dissipation efficiency, very high controllability and working flexibility and can meet the cooling requirements of the chip in different working conditions.

The invention relates to a microchannel liquid cooling heat radiator and a conduction cool plug for a high heat flux chip. The microchannel liquid cooling heat radiator is fixedly arranged on one side of the chip, and comprises a chip package plate, a cover plate and a cooling liquid circulation device. The chip package plate is packaged and fixed on one side of the chip. The edge of the other side of the chip package plate and the edge of the cover plate are sealed and fixedly connected. A circulation cavity is formed between the chip package plate and the cover plate. A number of heat radiating teeth are arranged on one side of the chip package plate in the circulation cavity. The cover plate is provided with a liquid inlet hole and a liquid outlet hole. The liquid inlet hole and the liquid outlet hole are respectively communicated with a cooling liquid circulation device through liquid cooling pipes. According to the heat radiator provided by the invention, a microchannel heat radiating structure with a number of heat radiating teeth is arranged on one side of the chip package plate in the circulation cavity; the contact heat resistance is reduced; the heat exchange efficiency is improved; and the heat radiator is favorable for heat radiating of the high heat flux density heating chip and other concentrated heat sources.

The invention provides a cold plate performance test device which is characterized by comprising a thermometer (4), a pressure meter (5), a flowmeter (6), a filter (7), a heat radiator (8), a flow valve (10), a water pump (11), a water tank (13) and a cold plate (1) which are sequentially connected together in series through a pipeline, wherein a fan (9) is fixed together with the heat radiator (8) through a bracket; an electric heater (12) is arranged on the side wall of the water tank (13) in a threaded connection manner; a heating resistance module (2) and a wall temperature sensor (3) are fixed on the surface of the cold plate (1) through bolts; and a control unit (14) is connected with the heating resistance module (2), the wall temperature sensor (3), the thermometer (4), the pressure meter (5), the flowmeter (6), the fan (9), the water pump (11) and the electric heater (12) through a conductive wire, so that a control part of the device is formed. The cold plate performance test device disclosed by the invention has the advantages of wide measurement range, small measurement error and high measurement precision.

The invention relates to a composite material and a preparation method thereof, and can be widely applied to the fields of batteries, environmental protection, adsorptive dehumidification, air conditioning, refrigeration, heat pumps, pressure-variable separation purification, hydrogen storage production and the like. The composite material comprises a supporting framework material, carbon microspheres and/or a carbon film and a loading material, the loading material comprises salt, an electrode material and a physical adsorbent, the carbon microspheres and/or the carbon film are/is firmly attached to the wall surfaces of pores in the supporting framework material, and the loading material is uniformly distributed inside the carbon microspheres and/or the carbon film, so that direct embedment of the loading material between carbon atoms is achieved, the anti-agglomeration inactivation capacity is obviously enhanced, and the service life is effectively prolonged; the composite material breaks through a limitation of the specific surface area of the original skeleton material, so that the specific surface area of the composite material can be effectively increased under the premise ofincreasing the loading capacity, and the adsorption, reaction or electron migration rate can be increased; the composite material conveniently achieves close contact between the adsorbent and a heat-exchanging wall surface by an extruding, bonding or brazing method, so that the contact heat resistance between the two is effectively reduced.

The invention discloses an integrated slit cold head of a U-shaped pulse tube refrigerating machine and a manufacturing method. The cold head comprises two parts of a top cover and a lower flange, wherein two cylindrical lug bosses protrude below a big lug boss of the top cover, outer diameters of the two cylindrical lug bosses are respectively equal to inner diameters of a cold regenerator and a pulse tube; the two lug bosses integrally cut and penetrate through a slit in parallel horizontally and uniformly; through insertion holes matched with the cylindrical lug bosses of the top cover are arranged on the lower flange, a sealing groove and a location groove matched with the big lug boss of the top cover are cut on the upper surface of the lower flange, the lower flange, the cold regenerator and the pulse tube are hermetically welded to form an assembly; the top cover and the lower flange not only can be connected by bolts to form a detachable split cold head, but also can be hermetically welded to form an integrated cold head. In the invention, the main functions of three parts of an efficient cold end heat exchanger, a pulse tube cold end gas director and a cold regenerator cold end gas distributor can be intensively realized in an integrated slit cold head structure, the overall performance of the U-shaped pulse tube refrigerating machine is enhanced.

The invention relates to a photovoltaic photo-thermal joint hydrogen production system. The photovoltaic photo-thermal joint hydrogen production system comprises a light condensing device, a spectroscopic device, a photovoltaic and photo-thermal integrated device, a heat transfer pipeline, a water tank, an electrolyzing device and a hydrogen-water separating device, wherein the photovoltaic and photo-thermal integrated device comprises a photovoltaic assembly, a heat collecting plate and a heat pipe; and the electrolyzing device comprises an electrolytic cell and an electrolytic water pipeline which forms a circulating loop with the electrolytic cell. The invention also provides a use method of the photovoltaic photo-thermal joint hydrogen production system. Compared with the prior art, the photovoltaic photo-thermal joint hydrogen production system has an advantage that the total utilization efficiency of solar energy is effectively improved. The heat pipe aims at effectively lowering the temperature of the photovoltaic assembly with the heat transfer effect in order to increase the electrolytic hydrogen production efficiency by 10-15 %; the electrolytic water exchanges heat with a hot water system so as to raise the temperature of the electrolytic water, and thus the electrolytic hydrogen production efficiency of the system can be increased by 5 to 7%. The total hydrogen production efficiency of the system can be increased by about 20%, and the thermal efficiency can be increased by above 60%.

The electronic terminal equipment comprising an electronic substrate on which a heat-generating electronic component is mounted and an electromagnetic shield member attached in proximity to the heat-generating electronic component, the electronic substrate being filled with a cured product of a thermally-conductive curable liquid resin between the electromagnetic shield member and the electronic substrate, and a thermally-conductive film being disposed in contact with an upper surface of the electromagnetic shield member or facing the upper surface thereof so as to diffuse heat that came up through the cured thermally-conductive curable liquid resin.

The invention discloses a high-temperature heat storage and evaporation integrated device, which comprises a heat storage block (5), a liquid storage tank (7), a heat insulation layer (4), a heating pipe (8) and an evaporation pipe (9). The heat insulation layer (4) is tightly attached to the outer wall of the liquid storage tank (7); the heat storage block (5) is placed in the liquid storage tank (7); a plurality of through holes are regularly distributed on the heat storage block (5) at equal intervals; and the heating pipe (8) and the evaporation pipe (9) alternately pass through the through holes on the heat storage block (5). The heating pipe (8) and the evaporation pipe (9) are light pipes or reinforced heat exchange pipes; and a high-temperature heat transfer working medium is filled in the container of the liquid storage tank (7).