12results about How to "Extended heat transfer path" patented technology

The invention discloses a heat insulation fabric and a preparation method thereof, and relates to the technical field of fabrics. The thermal insulation fabric is prepared by using a magnetic field to assist wet spinning of the modified silicon dioxide aerogel and the polyamide fiber and then oxidizing the acrylic acid at a high temperature; firstly, nano titanium dioxide is prepared through catalysis of modified polyurethane, the mechanical property of silicon dioxide aerogel is improved, and nano titanium dioxide has an excellent anti-ultraviolet effect and can further improve the heat insulation performance of the fabric; secondly, applying a magnetic field to assist the modified silicon dioxide aerogel and the polyamide fiber in wet spinning, and then decomposing acrylic acid at high temperature; the appearance of the nano titanium dioxide can be adjusted by applying a magnetic field, and the ultraviolet protection effect is improved; after the acrylic acid is decomposed, slender nano grooves and holes are left in the fabric, and the slender nano groove structure can increase the contact area between fibers and increase the heat transfer path, so that the fabric has an ultralow heat conductivity coefficient and achieves the effects of heat insulation and ultraviolet prevention.

The invention relates to the technical field of rail transit, in particular to a brake disc connecting structure, a full-disc type brake device and a rail vehicle. In the brake disc connecting structure, a brake disc comprises a plurality of brake movable discs and a plurality of brake movable discs which are arranged at intervals, a core shaft is suitable for being connected with a braked power shaft, the core shaft is arranged at the axis of the brake disc in a penetrating mode, the core shaft is fixedly connected with all the brake movable discs and can synchronously rotate, and all the brake discs can enable the core shaft to brake the power shaft through mutual extrusion. Wherein a center plate is arranged in the mandrel, one end of the center plate is connected with the inner wall of the mandrel, and the other end of the center plate is connected with a braked power shaft. The brake disc connecting structure is simple in overall structure and easy to disassemble and assemble, so that the later maintenance cost is reduced; moreover, the brake disc connecting structure utilizes the center plate in the mandrel to realize internal heat dissipation of the mandrel, so that the internal heat transfer path of the mandrel is prolonged, the influence of dynamic heat energy on the motor bearing is effectively reduced, the service life of the motor bearing is prolonged, and the use safety of the motor bearing is improved.

The utility model discloses an air-cooled cooking utensil which comprises a pot body and a pot cover covering the pot body, the pot body comprises an outer pot and an inner container arranged in the outer pot, a cooling fan is arranged on the side wall of the pot body, and a food amount mark is arranged on the side wall of the inner container. The food quantity mark comprises a minimum marking line, a maximum marking line and a median line located between the maximum marking line and the minimum marking line, and at least part of the area, projected towards the inner container, of the air outlet of the cooling fan is located above the median line so as to blow air flow to the area above the median line. In the pressure reduction stage of the cooking process, part of air flow blown out by the cooling fan flows towards the area above food in the inner container, so that the air flow preferentially makes contact with the area, above the food materials, of the inner container for cooling, and an original heat transfer route is changed from water vapor in the inner container to the food in the inner container to the side wall of the inner container to cold air. And water vapor in the inner container, the side wall of the inner container and cold air are adjusted, so that a heat transfer path is shortened, the temperature of gas in the inner container can be quickly reduced, and quick pressure relief is realized.

The utility model relates to the technical field of asphalt production, especially a kind of even heating device for polyurethane modified asphalt production, including, stirring bucket, for accommodating polyurethane modified asphalt;Agitating mechanism is set to the inside of stirring bucket, for stirring material, scrape the sidewall and bottom surface of stirring bucket;Conduction heating mechanism, it is around to set in the outside of stirring bucket, the inside of stirring bucket is heated by heat conduction oil conduction;And, radiation heating mechanism, the radiation heating mechanism is installed in the bottom of stirring bucket, the inside of stirring bucket is heated by infrared radiation, the utility model is guided to the heat conduction oil to be folded type path flow by folding type deflector, pass through turbulent disturbance and extend heat transfer path, so that heat is fully transferred, the heat transfer efficiency of heat conduction oil and stirring bucket wall is greatly improved, and the closed loop system of heat conduction oil furnace and circulating pump ensures that heat is continuously supplied and transported, so that heat transfer efficiency is greatly improved.

The invention relates to an energy-saving building material and application, and belongs to the technical field of building materials, the energy-saving building material comprises the following raw materials: Portland cement, fly ash, fatty acid polyoxyethylene ether sodium sulfate, dodecyl dimethyl betaine, a silicone resin polyether emulsion, a pretreated fiber blend and deionized water; wherein the pretreated fiber blend is prepared from polypropylene fiber, a polyoxyethylene polyoxypropylene block copolymer, potassium dichromate and deionized water together. A large number of closed pores which are small in size and volume difference and good in stability are distributed in the foam concrete prepared according to the selected raw materials and formula, the heat transfer path in the material is increased, the average heat conductivity coefficient of the material is reduced, and the finished product has excellent heat insulation performance, so that the energy-saving effect is outstanding; meanwhile, the pretreated polypropylene fiber is doped into the concrete to disperse or bear the stress generated in the concrete, so that the finished product has excellent crack resistance.

This utility model relates to the field of doors and windows, specifically to an energy-saving window frame and window system for curtain walls. The energy-saving window frame includes a sub-frame profile made of glass fiber reinforced composite material. A first end of the sub-frame profile is fixedly connected to a steel keel by a first screw. A second end of the sub-frame profile has an installation chamber containing a liner. A second screw passes through the liner and is fixedly connected to a pressure block. This utility model, by using a sub-frame profile made of glass fiber reinforced composite material, extends the heat transfer path, significantly reduces the thermal bridging effect, and thus achieves the goal of reducing the heat transfer coefficient. It is energy-saving and environmentally friendly, possessing good economic efficiency and practicality. The liner in the installation chamber effectively increases the screw holding force and enhances connection stability.

The invention discloses a preparation method of a surface hydrophobic modified gypsum-aerogel composite thermal insulation material. Comprising the following steps: calcining and aging gypsum of CaSO4. 2H2O to obtain gypsum powder of CaSO4. 0.5 H2O; the preparation method comprises the following steps: uniformly mixing gypsum powder of CaSO4.0. 5H2O and hydrophilic aerogel powder of which the heat conductivity coefficient is 0.01-0.02 W / (m.K) according to a mass ratio of 3-6, then adding water, carrying out injection molding maintenance, and drying to obtain a hydrophilic gypsum-aerogel composite material; and soaking the hydrophilic gypsum-aerogel composite material in a silane coupling agent solution, and after modification is finished, drying to obtain the surface-hydrophobic gypsum-aerogel composite material. The problems that traditional hydrophobic aerogel and gypsum are difficult to mix and poor in compatibility are solved, surface hydrophobic modification is achieved under the condition that it is guaranteed that the heat preservation performance and strength are not affected, the softening coefficient of gypsum is increased, and the application range of a gypsum-based material in a humid environment is widened.

The utility model provides a liquid hydrogen storage tank. The liquid hydrogen storage tank comprises an inner container and an outer container, the outer container is arranged on the periphery of the inner container in a surrounding mode, and the axis of the inner container and the axis of the outer container extend in the same direction; the first supporting structure is arranged between the inner container and the outer container, the first supporting structure comprises an inner supporting piece, an outer supporting piece and a connecting cylinder, the inner supporting piece is connected with the inner container, the outer supporting piece is connected with the outer container, the connecting cylinder is arranged between the inner supporting piece and the outer supporting piece, and the connecting cylinder is provided with a first annular outer flange; one of the first end of the inner supporting piece and the first end of the outer supporting piece is inserted into the connecting cylinder and abuts against the bottom wall of the connecting cylinder, and the other one of the first end of the inner supporting piece and the first end of the outer supporting piece abuts against the first annular outer flanging. Through the technical scheme provided by the invention, the problem of large heat leakage at the supporting structure in the related technology can be solved.

The invention relates to the technical field of cold region hard rock tunnel concrete, and particularly discloses a thermal insulation material for a cold region hard rock tunnel as well as a preparation method and application of the thermal insulation material. The thermal insulation material for the hard rock tunnel in the cold region is prepared from the following raw materials in parts by mass: 70 to 100 parts of cement, 10 to 14 parts of pretreated silicon dioxide, 10 to 16 parts of fly ash, 10 to 20 parts of thermal insulation aggregate, 100 to 120 parts of machine-made sand, 0.5 to 1.2 parts of potassium silicate, 2 to 2.6 parts of water reducing agent, 0.1 to 0.5 part of defoaming agent, 1 to 2 parts of accelerator and 17 to 22 parts of water, the pretreated silicon dioxide is prepared by the following specific operation: adding nylon 66 into a formic acid solution, stirring at 60-80 DEG C for 1-2 hours, adding tetraethoxysilane, continuously stirring for 10-20 minutes, adding nano graphene oxide, stirring for 1-2 hours, cooling to-100 to-80 DEG C, keeping the temperature for 1-2 hours, and freeze-drying.

The present invention discloses a bionic variable cross-section fin air-cooled phase change material composite cylindrical battery thermal management system, comprising: a fan, a cover plate, an insulating fixed bracket, a base, a cylindrical battery, a bionic variable cross-section fin and a phase change material; the cylindrical battery is radially staggered and nested in the insulating fixed bracket, the bionic variable cross-section fin is embedded in the insulating fixed bracket, the phase change material is filled around the cylindrical battery, the insulating fixed bracket is mounted on the base, the cover plate is mounted on the insulating fixed bracket, and the air is driven by the fan to enter the cooling air duct formed by the insulating fixed bracket, and heat is exchanged with the bionic variable cross-section fin to dissipate the heat of the cylindrical battery and the phase change material to achieve the purpose of temperature control. The present invention has the characteristics of simple structure, convenient installation, high heat dissipation efficiency and low energy consumption, and can ensure the safe and efficient operation of the power battery pack under high-rate charge and discharge cycle conditions.

The invention discloses a carrier wafer system with a high-temperature heat insulation structure, which is characterized by comprising a wafer main body, a temperature measuring device, a battery, a main control circuit, a box and a supporting structure, a customized high-temperature heat insulation structure is arranged in the box, the interior of the high-temperature heat insulation structure is divided into a battery independent cavity and a main control circuit cavity which are mutually independent, the battery is loaded in the battery independent cavity in a sealed mode, and the main control circuit is loaded in the main control circuit cavity in a sealed mode; the box is fixedly connected to the surface of the wafer main body through the supporting structure, and the temperature measuring device is arranged on the surface of the wafer main body and is electrically connected with the main control circuit. The device is good in stability, successfully solves the problems of inconvenience in temperature measurement, influence on a gas flow field, long cooling time and the like in the prior art, and provides a more efficient and accurate temperature measurement solution for the field of semiconductor processing.

This invention discloses a low thermoelastic damping reconstructed double-spoke MEMS multi-ring gyroscope, belonging to the field of microelectromechanical systems (MEMS). This MEMS multi-ring gyroscope has a fully symmetrical structure in a plane, consisting of a central fixed anchor point, multiple concentric rings, spokes, and electrodes. The central fixed anchor point is circular, fixed by an external structure, and shares the same center with the multiple concentric rings. The innermost concentric ring is connected to the anchor point via spokes. The multiple concentric rings are connected by spokes, and the width of the concentric rings can be adjusted as needed, with varying spacing between the rings. The spoke structure includes single straight spokes, double straight spokes, and reconstructed double straight spokes. Spokes of the same ring are evenly distributed circumferentially, with the axes of adjacent rings differing by 22.5°. The outermost ring is connected to the first ring from the outside in by a single straight spoke, the innermost ring is connected to the anchor point by double straight spokes, and the remaining rings are connected by reconstructed double straight spokes. This gyroscope features a unique reconfigured double spoke design that extends the heat transfer path to reduce heat transfer at the spokes, thereby altering the internal temperature and heat flux distribution of the gyroscope; reducing the thermoelastic damping of the device; improving the gyroscope's sensitivity; and reducing zero-bias instability.