331results about How to "Large thermal resistance" patented technology

An electric vehicle includes plurality of batteries accommodated in a rear portion of a battery box, and an electric part is accommodated in an electric part accommodating chamber provided in a front portion of the battery box. Cooling air supplied from a cooling fan to the rear portion of the battery box cools the batteries having a large thermal resistance, while being passed through a first cooling air passage around outer peripheries of the batteries at a low flow rate. A second cooling air passage having a smaller sectional area than that of the first cooling air passage is provided below the electric part accommodating chamber, and cooling fins protruding downwards from the electric part are exposed within the second cooling air passage. The second cooling air passage extends continuously the first cooling air passage in a downstream direction of airflow, so that cooling air which has first cooled the batteries then cools the electric part having a smaller thermal resistance, while being passed through the second cooling air passage at a higher flow rate than that in the first cooling air passage.

A power semiconductor module with its thermal resistance and overall size reduced. Insulating substrates with electrode metal layers disposed thereon are joined to both the surfaces of a power semiconductor chip by using, for example, soldering. Metal layers are disposed also on the reverse surfaces of the insulating substrates and the metal layers are joined to the heat spreaders by using brazing. Heat radiating fins are provided on the heat radiating surface of at least one of the heat spreaders. The heat radiating side of each of the heat spreaders is covered by a casing to form a refrigerant chamber through which refrigerant flows to remove heat transmitted from the semiconductor chip to the heat spreader.

The invention relates to a cement-based shrinkage-free joint filling sealing mortar for doors and windows and a preparation method and a construction method thereof. The sealing mortar is prepared by the components in parts by weight as follows: 100 parts of cement, 0-80 parts of active admixture, 0.01-10 parts of water reducer, 0.01-10 parts of early strength agent, 0.01-10 parts of thickening time control agent, 0-25 parts of expanding agent, 0-30 parts of binder, 0-10 parts of air entraining agent, 0.01-30 parts of plastic retaining agent, 0.01-10 parts of moisture repellent, 0-5 parts of starch ether, 0-150 parts of powder filler and 0-300 parts of aggregate. Compared with the prior art, the mortar provided by the invention has the advantages of no shrinkage, strong binding power, no falling, good anti-permeability, simpleness in construction, efficiency and the like, and can adequately fill joints of doors and windows to ensure the sealing property around the doors and windows, and water is prevented from being seeped into the doors and windows.

A cooling system applying a thermo siphon therein, being superior in energy saving and/or ecology, with an effective cooling, and also an electronic apparatus applying that therein, in particular, for cooling a CPU 200 mounted on a printed circuit board 100 within a housing thereof, comprises a heat-receiving jacket 310, being thermally connected with a surface of the CPU generating heats therein, and for evaporating liquid refrigerant stored in a pressure-reduced inner space with heat generation thereof, a condenser 320 for receiving refrigerant vapor from the heat-receiving jacket within a pressure-reduced inner space thereof and for condensing the refrigerant vapor into a liquid by transferring the heats into an outside of the apparatus, a vapor tube 331, and a liquid return tube 332, with applying the thermo siphon for circulating the refrigerant due to phase change thereof, wherein the condenser forms fine grooves on an inner wall surface thereof along a direction of flow of the refrigerant, and is also formed flat in a cross-section thereof, for cooling the refrigerant vapor from the heat-receiving jacket on the inner wall surface thereof, efficiently.

The invention relates to a waterborne heat-insulating flame-retardant multifunctional nano coating and a preparation method thereof. The coating consists of the following components in part by weight: 48 to 52 parts of waterborne resin and 30 to 50 parts of nano pigment fillers (nano titanium dioxide, nano titanium dioxide-coated hollow glass microspheres, nano titanium dioxide-coated hollow ceramic microspheres and nano antimony-doped tin dioxide (ATO) particles), size and auxiliary materials such as film-forming additive and coupling agent. The preparation method includes the steps that: the nano fillers and the size are first dipped into the waterborne resin, the auxiliary materials are then sequentially added and stirred, and thereby the heat-insulating flame-retardant multifunctional nano coating is obtained. The processing technique is simple, the component proportion is reasonable, and the prepared coating has the advantages of high heat resistance, high reflectivity, high radiative heat conductivity, certain fire resistance, high-efficient heat insulation, excellent mechanical and chemical properties, environment-friendliness, stain resistance, flame retardance and energy saving. The coating can be coated on outside facilities such as outer walls and building roofs.

An improved dry heat method and apparatus for thawing frozen biological fluids utilizing electrically heated plates and oscillatory motion to enhance heat transfer by mixing as the fluid thaws. Bags of frozen fluid to be thawed are lightly squeezed between two heating plates, one of which is gently oscillated to facilitate mixing of the thawing fluid, increasing heat transfer and reducing time required for thawing. Direct contact of the heating plates against the bag surfaces increases heat transfer by eliminating insulative effects of another bag wall and a water boundary layer, compared to water bath units. Flat (or curved to conform to bag) heat pipes are preferred as heating plates compared to plain aluminum sheet. Flat heat pipes have the property of an isothermal heating surface, thus maximizing heat transfer to the coldest areas, preventing hot spots, and simplifying heating plate temperature control.

The invention discloses continuous casting crystallizer covering slag special for extra-thick slab peritectic steel and a preparation method thereof. In the covering slag, a peritectic reaction is performed in the process of solidifying the peritectic steel, and the overquick or overlarge volume contraction of the peritectic steel leads to the surface quality problems such as casting blank cracks, and causes dangers in a continuous casting process. In consideration of the characteristics of the peritectic steel, the covering slag for the extra-thick slab peritectic steel shall be cooled slowly and has higher alkalinity and melting points so as to increase the heat resistance of a slag membrane of the covering slag, reduce the speed of transferring heat outwards by casting blanks, and increase the uniformity of heat transfer.

A hydrophobic heat-insulation coating comprises, by weight, 35-45% of an emulsion, 8-11% of a pigment, 4-7% of a heat-insulation functional filler, 10-12% of a body filler, 0.4-0.5% of a wetting agent, 1-1.5% of a dispersant, 0.5-0.6% of an antifoaming agent, 0.7-0.8% of a thickener, 1-2% of a film forming assistant, 7-10% of a hydrophobic agent, 0.3-2% of other assistants, and the balance of water. The heat-insulation functional coating prepared through coating hollow glass beads with TiO2 has the advantages of large heat resistance, low conductive coefficient, high photo-thermal reflectivity, effective reduction of radiative heat transfer and convective heat transfer and heat insulation effect, and nanometer anatase titanium dioxide has photocatalysis characteristic, effectively degrades formaldehyde, and plays a great role in solving of environment pollution and energy waste. The coating integrates the respective advantages of an aqueous coating, a hydrophobic coating and a heat insulation coating, and is a green and environmentally-friendly coating.

A canned linear motor armature and a canned linear motor of water cooling type are provided. The insulation reliability of a canned linear motor armature is improved. The temperature rises of both the linear motor surface and the armature winding are reduced. Even if the coolant pressure increases, the can neither breaks nor deforms. The weight of the armature is lightened. The viscosity braking force is reduced. In the canned linear motor armature, the armature winding (104) is surrounded with a picture-frame-shaped case (111), both the openings of the case (111) are closed with flat can (121), and coolant passages (131) are provided inside the can (121) and on the top surface of the coil side of the armature winding (104).

The invention discloses a forced convection power battery heat radiation device. A battery pack box which is opened upwards comprises a plurality of columnar batteries which are arranged at intervals; at least one heat diffusion plate is arranged between the tops and bottoms of the batteries inside the battery pack box; the batteries are tightly sleeved by the heat diffusion plates through sleeves; the space below the heat diffusion plates inside the battery pack box is filled with a heat absorption and conduction material layer; an air inlet and a vent hole are respectively formed in two opposite side walls above the heat diffusion plates of the battery pack box correspondingly; fans are arranged at the air inlet and/or the vent hole; or gaps are formed between the heat diffusion plates and the side walls of the battery pack box; an air inlet and a vent hole are respectively formed in two opposite side walls of the battery pack box; fans are arranged on the air inlet and/or the vent hole; no through holes are/are not formed in the heat diffusion plates. The forced convection power battery heat radiation device can be applied to active air cooling heat exchange and passive heat radiation of a filled phase-change material as well, and is good in heat radiation effect, relatively uniform in temperature distribution, compact in appearance, simple in structure and applicable to power battery systems.

In a cold stocker according to the present invention, a compartment-cooling heat exchanger is connected to a cold-side heat exchanger mounted to a cold section of a Stirling refrigerating engine so as to form a cold-side refrigerant circulation circuit. To a warm section of the Stirling refrigerating engine, a first warm-side heat exchanger and a second warm-side heat exchanger are mounted. A heat-dissipating heat exchanger is connected to the first warm-side heat exchanger so as to form a first warm-side refrigerant circulation circuit. To the second warm-side heat exchanger are connected a heat exchange portion for promoting evaporation in drainage and a heat exchange portion for preventing dew condensation on a cold stocker wall so as to form a second warm-side refrigerant circulation circuit.

The invention discloses a flat heat radiating pipe which comprises a pipe cavity with two closed ends and a pipe wall enclosing the pipe cavity along the axial direction, wherein the pipe wall comprises arc walls positioned at two sides and a flat wall for connecting the arc walls, the pipe cavity and the pipe wall are sequentially defined as an evaporation section, a heat insulation section and a condensation section along the axial direction; the pipe cavity is internally provided with a main capillary structure and an auxiliary capillary structure, wherein the main capillary structure is in contact with the flat wall of the evaporation section or in contact with the flat walls of the evaporation section and the heat insulation section; the auxiliary capillary structure is in contact with the arc wall positioned at least one side, the pipe cavity between the main capillary structure and the auxiliary capillary structure is filled with a working medium; and a main gas channel of a heat radiating pipe has enough space so that capillary force of the flat heat radiating pipe is improved and conveying capacity of the working medium is increased, and thus heat transfer efficiency of the flat heat radiating pipe is increased. The invention also provides a manufacturing method of the flat heat radiating pipe.

The invention discloses a high-performance thermoelectric device and an ultrafast fabrication method thereof. In the high-performance thermoelectric device, a segmented structure is employed to perform optimal matching of a thermoelectric material and a temperature difference environment, a blocking layer and a buffer stress layer are employed to reduce interface element migration and longitudinalcontact thermal expansion stress and improve bonding strength, a phonon scattering layer and a negative thermal expansion buffer layer are embedded to fix a thermoelectric leg so as to improve internal thermal resistance and horizontal thermal matching performance of the high-performance thermoelectric device, internal package and external package are employed to prevent the thermoelectric material from being oxidized and sublimed and improve external collision-resistant capability, the technical bottlenecks of low energy conversion efficiency, small specific power, poor thermal stability, poor collision performance, complicated fabrication process and the like of a traditional thermoelectric device are effectively broken through, meanwhile, the thermal stability and the mechanical structural performance of the high-performance thermoelectric device are improved to a great extent, long-term and excellent electrical output performance is guaranteed, and the working environment is expanded.

The invention discloses continuous casting crystallizer casting powder for austenite antibacterial stainless steel. The alkalinity of the continuous casting crystallizer casting powder ranges from 1.0 to 1.1, and the continuous casting crystallizer casting powder can achieve a very good heat transfer control effect and meet the requirement for shrinkage characters of the austenite antibacterial stainless steel. The viscosity is set as 0.10 Pa*s-0.18 Pa*s at the temperature of 1300 DEG C, so that the casting powder flows in gaps between blank shells and a crystallizer copper plate more evenly, casting blanks are lubricated, the requirement for the consumption of the crystallizer casting powder is met, and the viscosity is mainly controlled Al2O3, MgO and F-. The melting point ranges from 1130 DEGC to 1190 DEG C, heat resistance of the casting powder is increased, the heat transfer uniformity index of the crystallizer casting powder is increased, and cracks are difficult to produce. Raw materials of the continuous casting crystallizer casting powder are easy to obtain, and cost is relatively low. By means of field tests, the casting powder is melt uniformly and stably, the indentation rate of the edges of the casting blanks is decreased by about 9.5%-19%, quality of the casting blanks is improved, and smooth operation of processes of a steel mill is guaranteed.

The invention discloses a full-body high-strength damp-proof gypsum block and a preparation method. The full-body high-strength damp-proof gypsum block is prepared from the following materials in percentage by weight: 50-55% of building gypsum, 42-45% of water, 1-3% of cement, 0.2-1.5% of fiber, 0.2-1.0% of wood powder, 0.2-0.5% of a water reducing agent, 0.05-0.4% of a water proofing agent, and 0.005-0.02% of paint. According to the full-body high-strength damp-proof gypsum block prepared by adopting the uniform stirring technology, adding the waterproof component and strengthening the toughening component, the uniformity of the full body of a wall body material is improved, and the strength, the humidity resistance, the shock resistance, the permeation resistance, the crack resistance and the fireproof performance of the wall body material are improved; various performance indexes are superior to that of the conventional wall body material and the common gypsum block, cracking and permeation of the built wall body are avoided, and the engineering quality is ensured.

The invention discloses a planar flexible thermoelectric power generation structure which includes a thermal conduction layer, an insulating layer, a power generation layer and a hot-end protective layer, which are sequentially arrayed and laid from bottom to top. All of the thermal conduction layer, the insulating layer, the power generation layer and the hot-end protective layer adopt flexible materials. A first flexible material and a second flexible material are closely arrayed alternatively so that the thermal conduction layer is formed. The hot-end protective layer is a flexible insulating strip. Both of the heat conduction factors of the first flexible material and the flexible insulating strip are lower than the heat conduction factor of the second flexible material. The structure increases protection of a hot end and heat radiation of a cold end, improves the temperature gradient of a thermoelectric power generator and further improves an output power and an output voltage. The thermal conduction layer provides a temperature gradient needed by the thermoelectric power generator and has a support function; the flexible materials are adopted so that compared with a rigid thermoelectric power generation device, the power generation structure is flexible, light and convenient and capable of better fitting to the plane; and the power generation structure is simple in structure and manufacturing process and capable of realizing mass production, and has an excellent application prospect.

A cooler dissipating heat generated from a heat generating source effectively while suppressing generation of noise by suppressing ejection volume of gas, a heat sink, and an electronic apparatus mounted with them. The heat sink (3) is provided with cuts (24a, 24b) capable of taking in gas, i.e. air, from the external, on the side for receiving air ejected from first and second nozzles (6, 7) as the openings of a jet generation mechanism (2). Consequently, pressure is lowered in the vicinity of the cuts by the air flow ejected from the first and second nozzles (6, 7) and external air is sucked from the cuts (24a, 24b). Since a larger quantity of gas than that ejected from the first and second nozzles (6, 7) is discharged from the outlet of the heat sink, generation of noise is suppressed by suppressing the ejection volume as much as possible and the heat generated from the heat generating source can be dissipated effectively.