55results about How to "Eliminate thermal contact resistance" patented technology

The invention discloses an extended integral flat heat pipe at a condensation end, which belongs to radiating devices. A flat heat pipe is manufactured in a radiating fin, namely, outer-layer fins of the radiating fin are fixed to a bottom plate, a porous metal material layer is attached onto the bottom plate, and capillary liquid sucking cores are manufactured in inner cavities of various middle fins; grooves are formed on a base of the radiating fin by the middle fins; and when low-boiling liquid in the porous metal material layer is heated and vaporized, steam flows out from insides of porous materials under tiny pressure, and uniformly flows to the inner cavities, which is used as condensation channels and arranged inside the fins, of the middle fins via the grooves at the bottom of the radiating fin. The flat heat pipe and the radiating fin are integrated, contact thermal resistance between the flat heat pipe and the radiating fin is eliminated, simultaneously, condensation area of the steam is increased, longitudinal heat conduction capacity of the flat heat pipe is improved, and radiating efficiency of a radiating device is enhanced. In addition, the extended integral flat heat pipe operates and runs at low cost and low energy consumption, and brings a good way for solving the problem that heat dissipation of high-power photoelectric chips is restricted.

The invention discloses a composite heat dissipation device. The device comprises a flat plate heat tube and multiple sandwiched phase transition material composite boards. The evaporation end of the flat plate heat tube is used for taking heat from a heating element. The condensation end of the flat plate heat tube is connected with base parts of the sandwiched phase transition material composite boards. A multi-hole capillary liquid adsorbing core layer is arranged on the inner wall of the evaporation end. A bionic capillary liquid adsorbing core is arranged on the multi-hole capillary liquid adsorbing core layer. Each sandwiched phase transition material composite board comprises an enclosed inner cavity. Phase transition materials are arranged in each inner cavity. The side wall of each inner cavity is a metal plate. According to the invention, the flat plate heat tube with the capillary liquid adsorbing core has good temperature averaging ability; through the phase transition materials, temperature peaks are inhibited, so normal work of the whole electronic device is ensured; and through the integrated design of the flat plate heat tube and the sandwiched phase transition material composite boards, contact thermal resistance between a traditional flat plate heat tube and a heat sink is eliminated. In one word, the heat dissipation device is better in temperature averaging ability, stronger in heat dissipation ability, high in safety and simple to process.

The invention discloses a miniature throttling refrigerator which is composed of an upper cover plate, a lower cover plate, a heat-exchange core body and a cold-end seal head. An upper rib sheet and a lower rib sheet are fixed on the two sides of a panel base of the heat-exchange core body; channels which are in disjunction distribution and vertical to the long side edges of the panel base are formed in the length direction of both the upper and lower rib sheets; the upper rib sheet is located in a lower groove of the upper cover plate; the lower rib sheet is located in an upper groove of the lower cover plate; a through hole and an air inlet are formed in the top part of one end of the upper cover plate while the other end is unsealed and provided with a throttling hole; a through hole and an air outlet are formed in the top part of one end of the lower cover plate while a throttling hole is formed in the other end thereof; the upper cover plate, the lower cover plate and the heat-exchange core body compose a throttling refrigeration body; the cold-end seal head is arranged on one end, at which the throttling hole is, of the throttling refrigeration body in a sleeved manner; a low-pressure passageway is formed between the upper cover plate and the upper rib sheet; a high-pressure passageway is formed between the lower cover plate and the lower rib sheet; a high-temperature and high-pressure fluid enters into the high-pressure passageway from the air inlet, is changed into a low-temperature and low-pressure fluid after passing through the throttling hole, then enters into the low-pressure passageway, and finally flows out of the air outlet. The miniature throttling refrigerator has big specific surface area and high heat exchange efficiency, can bear high-pressure operation and is easy for large-scale production.

The invention discloses a parallel stream heat exchanger integrated with a microchannel and an outer fin, comprising a left collector tube, a right collector tube, an upper cover board, a lower coverboard, a cooling fin set, an air inlet pipe and a liquid outlet pipe; the cooling fin is integrated with a fin and aluminium profile, a microchannel is arranged on the aluminium profile, and the diameter or edge distance of the microchannel is 0.5-3mm; the microchannel of the cooling fin is communicated with the left collector tube and the right collector tube, distance pieces which are arrayed ina staggering way are arranged in the middle of the left and right collector tubes at interval, the left and right collector tubes are divided into a plurality of areas, the air inlet pipe and the liquid outlet pipe and the left and right collector tubes are connected by welding, and the upper cover board and the lower cover board are respectively connected with the left and right collector tubes;by utilizing the microchannel technology, integral outer fin technology and collector tube technology, the invention effectively solves the problem of thermal contact resistance of sheets and the fins; the structure is compact, heat exchanging efficiency is high, the volume is small, the quality is light, the processing is simple, and the heat exchanger adopts all aluminium composite material, thereby greatly reducing the cost.

The invention discloses an LED (Light Emitting Diode) integrated light source with a tubular structure. The LED integrated light source is provided with a heat radiating structure and is luminous within a range of 360 degrees. According to the invention, the LED integrated light source comprises a tubular packaging bracket, wherein an LED packaging chamber, in which a plurality of strip-shaped recesses are formed, is formed in the outer wall of the tubular packaging bracket; a plurality of chip heat conducting glues are arranged on the bottom surfaces of the recesses of the LED packaging chamber; LED chips are arranged on the chip heat conducting glues; the LED chips are connected with each other through chip interconnecting wires; lead bonding pad plates are arranged at two ends of the LED packaging chamber; the LED chips are connected with the lead bonding pad plates through chip interconnecting wires; a fluorescent powder colloid is arranged in the LED packaging chamber; and a plurality of air convection holes are formed in the tubular packaging bracket. The LED integrated light source with the tubular structure has the advantages of simple structure, uniformity of luminance, large irradiation range and convenient application; and through the adoption of the tubular packaging bracket with heat radiation fins and the air convection holes, the heat generated by the LED chips is effectively radiated.

The invention relates to a solar photoelectric photo-thermal integrated assembly and a solar combined heat and power generation system of the solar photoelectric photo-thermal integrated assembly. The solar photoelectric photo-thermal integrated assembly is characterized by comprising a photovoltaic cell panel provided with a metal outer frame, a metal sheet type heat exchanger and a heat-preservation material layer, wherein the metal sheet type heat exchanger and the heat-preservation material layer are sequentially arranged on the back surface of the photovoltaic cell panel in parallel and in an overlapped mode, and are rapidly fixed in the metal outer frame of the photovoltaic cell panel through a metal fixing clamp, and the standard photovoltaic cell panel can be rapidly modified into the photoelectric photo-thermal integrated assembly. The photoelectric photo-thermal integrated assembly has the advantages of being compact in structure, high in efficiency, small in pressure loss, light in weight, flexible to install, high in pressure bearing performance, resistant to corrosion, low in cost and the like, further reduces the initial investment and installation space of a medium and low temperature solar thermoelectric system, lowers the operation expenses of the system, and is suitable for civil and industrial occasions requiring for both heat and power.

Collector tube for a solar collector, having an envelope tube, an absorber tube which is arranged within the envelope tube and into whose interior a heat carrier medium can be carried, characterized by an inner tubular element which is arranged within the absorber tube and has a thermal conductivity which is variable. Distributor segment for at least one collector tube which is designed in particular according to one of the preceding claims, having at least one first opening for supplying a heat carrier medium into the at least one collector tube, at least one second opening for carrying the heat carrier medium away from the at least one collector tube, a channel for supplying the heat carrier medium from outside the at least one collector tube into the at least one collector tube, a channel for carrying the heat carrier medium away from the collector tube to outside the at least one collector tube, with the supply channel and the output channel being arranged such that the distributor segment can be directly coupled to at least one further identical distributor segment in a heat carrier medium circuit.

The invention discloses a heat exchanger provided with annular slots and used for a sound-energy refrigerating machine, and belongs to the technical field of heat exchangers. The heat exchanger provided with the annular slots and used for the sound-energy refrigerating machine comprises an inner rib body and an inner sleeve. The inner rib body is an annular cylinder with the inner annular surfaceopen towards the outer annular surface. The inner sleeve is arranged in the inner rib body in a sleeved mode and is in interference fit with the inner rib body. The multiple slots are formed in the inner annular surface of the inner rib body at intervals, so that a slot channel allowing air to flow therein is formed between the inner rib body and the inner sleeve. According to the heat exchanger provided with the annular slots and used for the sound-energy refrigerating machine, forced-convection heat change between alternately-flowing working medium gas and the inner wall of the heat exchanger is achieved, and the heat exchange coefficient is large; in the heat conduction direction towards the outside, through interference fit between the inner rib body and the inner sleeve as well as a welding structure of the inner rib body and outer fins, contact heat resistance is eliminated; and in addition, the inner rib body is made of red copper with small heat conduction resistance, and thusthe heat exchanger provided with the annular slots in the hot end has a good cooling effect.

The invention belongs to the technical field of ceramic materials, and particularly relates to preparation of pressureless sintering high-thermal-conductivity and high-strength aluminum nitride ceramic. The aluminum nitride ceramic is prepared by carrying out oxidation treatment on an aluminum nitride sintered body obtained by pressureless sintering, a compact oxide layer with a proper thickness can be formed on the surface of the aluminum nitride sintered body through proper oxidation treatment, the residual compressive stress in an aluminum nitride matrix can be increased through the formation of the oxide layer, and the change of the residual compressive stress is beneficial to preventing expansion of cracks in the aluminum nitride ceramic and reducing the contact thermal resistance ofan aluminum nitride grain boundary. According to the aluminum nitride ceramic provided by the invention, after oxidation treatment, the thermal conductivity can be improved to 185-210 W/(m.K), the bending strength is improved to 390-460 MPa, the dielectric constant is 9-10, the dielectric loss is 0.8*10<-3> to 2.4*10<-3>, and the application requirements of industries such as semiconductor devicesand integrated circuits can be met.

The invention discloses a three-dimensional steam cavity type phase change heat storage device. The device comprises a three-dimensional steam cavity and a packaging shell; the three-dimensional steamcavity comprises a heat transfer substrate and heat dissipation teeth, the heat transfer substrate and the heat dissipation teeth are all hollow structures to form an integrated closed cavity, and aphase change medium is sealed in the steam cavity; a sealed cavity is also formed between the packaging shell and each heat dissipation tooth of the three-dimensional steam cavity, and a proper amountof a phase change material is arranged in the sealed cavity; and one side of the heat transfer substrate of the steam cavity serves as a heat plane, heat flows in from the heat plane and diffuses through the three-dimensional steam cavity to the phase change materials on the outer sides of the heat dissipation teeth. According to the design, based on the characteristics of the good heat diffusionperformance of the three-dimensional steam cavity and the high-efficiency heat absorption of the phase change materials, the novel phase change heat storage device with the high-efficiency heat transfer and heat dissipation performance and the low cost is provided, and the heat dissipation problem under the occasions with the high heat flow density and periodic thermal shock in a limited closed space such as being onboard is solved.

The invention discloses an embedded type combined heat sink as well as a preparation method thereof. The heat sink comprises a primary radiator and a secondary radiator. By taking the secondary radiator as a base body, the primary radiator is embedded into a surface layer of the base body to form a composite layer located on the surface layer of the base body. The integrated structure is the embedded combined heat sink. The preparation method comprises the following steps: (1) by taking a secondary radiator material as the base body, carrying out softening annealing heat treatment on the base body; (2) preparing diamond powder into a suspension liquid, wherein the diamond powder subsides on the surface of the base body; under the premise that distribution of diamond on the surface of the base body is not changed, reducing the liquid level to be under the surface of a sample and taking out the sample; and (3) reducing the thickness of a diamond powder-containing liquid film on the surface of the sample; then, pressing the diamond powder into the base body; and finally, carrying out diffusion annealing treatment on the sample and cooling to obtain the heat sink. The primary and secondary radiators are integrated to eliminate the contact heat resistance. The thickness of the heat sink is just dozens of microns, so that the heat resistance is small. The process links are reduced and the cost is lowered.

The invention relates to a plate type integral heat tube for heat radiation of an electric magnetic iron remover. The plate type integral heat tube comprises a rectangular flat plate; evaporation groove channels parallel to each other are distributed on the rectangular flat plate uniformly and are located between an upper surface and a lower surface of the rectangular flat plate; and the axis is parallel to the upper surface and the lower surface of the rectangular flat plate. A through hole is formed in the center of the rectangular flat plate, wherein the axis of the through hole is perpendicular to the upper surface and the lower surface of the rectangular flat plate. A hollow ring is arranged at the periphery of the through hole; and the evaporation groove channels penetrating the periphery of the through hole are communicated with the inner cavity of the hollow ring. Branch pipes are respectively arranged at a first side surface and a second side surface of the rectangular flat plate, wherein the branch pipes are hollow ones with two closed ends; ports of the evaporation groove channels located at the first side surface or second side surface are communicated with inner cavities of the branch pipes arranged at the corresponding side surfaces; straight finned tubes connected with the inner cavities of the branch pipes are arranged on the branch pipes. According to the invention, the structure is simple and reliable; the heat-transfer capability is high; and the cost performance is high. Compared with the heat radiator having the independent multi-heat-tube structure, the heat radiation capability, the temperature uniformity effect, and the processing mounting efficiency are improved and the production cost is lowered. The plate type integral heat tube is suitable for industrialized application.

The invention relates to a crude oil gathering and transportation heating furnace tail gas waste heat recycle and emission reduction device. The crude oil gathering and transportation heating furnace tail gas waste heat recycle and emission reduction device comprises a heating furnace, a water return tank and a crude oil preheaing device, and also comprises a tail gas waste heat recoverer and an anticorrosion heat exchanger, wherein a smoke guide channel is arranged in the heating furnace; the other end of the smoke guide channel is communicated with the lower part of the tail gas waste heat recoverer; a water inlet pipe and a water outlet pipe in the heat release end of the anticorrosion heat exchanger are respectively communicated with the water outlet end and the water inlet end of the tail gas waste heat recoverer; a water inlet pipe of the heated end of the anticorrosion heat exchanger is connected with the water outlet of the water return tank; the water outlet pipe of the heated end of the anticorrosion heat exchanger is connected with the water inlet of the heating furnace; crude oil gathering and transportation heating furnace tail gas is guided into the tail gas waste heat recoverer, a lot of sensible heat in the recovered tail gas and the condensation latent heat of vapour contained in the tail gas are capable of improving the thermal efficiency of the heating furnace to over 10%, sulfur oxide, nitric oxide, carbon monoxide, carbon dioxide, fly ash and smoke in the tail gas can partially and wholly dissolve in water, and the environment protection is facilitated.

The invention relates to a liquid direct contact type cooling device. The liquid direct contact type cooling device comprises a cooling device body, a heat exchanging mechanism and a circulating pump, wherein the periphery of the connector of the cooling device body is used for being coordinated with a power device to seal a cooling cavity, and the cooling cavity of the cooling device body and the heat exchanging structure can allow cooling media to form a circulating loop through the circulating pump. During work, the cooling media in the direct contact type cooling device can directly contact with the radiating surface of the power device to take away heat; compared with a radiating manner with low specific heat capacity, the liquid direct contact type cooling device eliminates the contact heat resistance between the radiating surface of a traditional power device and the radiating plate of a cooling device and can evidently increase heat transfer performance; the heat exchanging structure can constantly take away the heat by the circulating flowing of the cooling media, and the overall radiating efficiency of the power device is increased greatly. In addition, the liquid direct contact type cooling device can allow the temperature of the radiating surface of the power device to be even and prolong the service life of the power device.

The invention discloses a heat dissipation structure of a high-voltage and high-current vacuum circuit breaker. , the heat dissipation guide rod and the upper end cover of the vacuum circuit breaker are sealed by a shaft seal; it also includes a finned radiator arranged on the outer periphery of the lower flange and extending out of the outer edge of the lower flange, and the finned radiator is connected to the lower flange. The flange is integrally cast; this design can effectively increase the heat dissipation area of ​​the circuit breaker, reduce the temperature rise, and significantly increase the rated current of the high-voltage vacuum circuit breaker. The manufacturing process is simple, the cost is low, and the reliability is high.

The invention discloses a surface source black body temperature control structure with high temperature uniformity. According to the surface source black body structure, a black body and a temperature control cold plate are integrally designed, a two-phase working medium flow channel is designed in the black body, and the two-phase working medium in the flow channel directly acts on the black body, so that the contact thermal resistance between the temperature control cold plate and the black body is eliminated, and the heat exchange temperature difference between the two-phase working medium and the black body is effectively reduced; and the temperature adjusting capability of the two-phase working medium on the black body surface is enhanced. The two-phase working medium flow channel is formed by connecting a plurality of parallel micro channels in parallel and is uniformly distributed in the black body, so that the two-phase working medium is uniformly distributed in the black body, the two-phase working medium flows and boils in the black body, the heat exchange coefficient is higher than that of a single-phase loop by one order of magnitude, the temperature control capability is high, the temperature control range is large, the stability is good, and the precision is high. Meanwhile, the surface temperature of the black body is measured through embedded contact type temperature measurement, environmental interference is avoided, and the temperature measurement precision is high.

The invention discloses an opposite-rounded-corner oblique-breaking-type finned tube non-contact thermal resistance heat transmission element and belongs to the technical field of heat exchanging. The opposite-rounded-corner oblique-breaking-type finned tube non-contact thermal resistance heat transmission element comprises radiating fins and a rectangular heat transmission flat tube. The radiating fins are oblique opposite-rounded-corner ripple breaking fins, the fins and the heat transmission flat tube are integrally formed, and welding is of no need. Contact heat resistance is of no need, heat transmission efficiency is high, a manufacturing technology is simple, the structure is compact, size is small, anti-shocking capacity is high, and accordingly the opposite-rounded-corner oblique-breaking-type finned tube non-contact thermal resistance heat transmission element can be widely used in heat exchangers of various products such as an air conditioner, cooling equipment and vehicles.

The invention relates to a novel integrated water cooled thyristor comprising a tube seat and a tube cover, and a chip having a protection layer is arranged between the tube seat and the tube cover; the other end of the tube seat is connected with a heat dissipation device. Through external press mounting force, the bottom face of the tube seat of the thyristor is enabled to be connected with the heat dissipation device; the base seat and the heat dissipation device share a face, contact thermal resistance between a conventional thyristor and the heat dissipation device can be reduced, and therefore heat can be transmitted to the heat dissipation device from a chip of the thyristor; heat dissipation efficiency can be improved.

The invention provides a variable-frequency air conditioner driver module chip cooling device and a variable-frequency air conditioner. The cooling device includes a heat conducting plate. The heat conducting plate is provided with at least one through hole penetrating the heat conducting plate along the plane where the heat conducting plate is so that a first end and a second end of the heat conducting plate form interfaces. Refrigerant pipes are connected to the interfaces in a sealing manner. In the scheme, the refrigerant directly contacts the heat conducting plate, and the problem that the cooling efficiency is decreased due to poor contact between the refrigerant pipes and the heat conducting plate in the prior art is avoided. In the prior art, the refrigerant needs to transfer heatthrough the walls of the refrigerant pipes and the heat conducting plate to cool the chip. While in the scheme, the refrigerant only needs to transfer heat through the heat conducting plate to cool the chip. The thermal contact resistance between the heat conducting plate and the refrigerant pipes is eliminated, and the efficiency of heat transfer is improved. The chip can be cooled efficiently. The cooling device can effectively cool a driver module chip under adverse conditions, such as too low voltage and too high ambient temperature, so as to ensure the output ability of the unit.