10results about How to "Raise the temperature gradient" patented technology

This invention relates to the field of wearable electronic device technology, specifically disclosing a partitioned, double-sided, skin-contact, sweat-wicking hybrid energy harvesting armband and its manufacturing method. The armband includes a flexible strip substrate, an organic photovoltaic (PV) power generation unit, a polymer thermoelectric power generation unit, a skin-contact thermal interface layer, a cold-end heat dissipation structure, and a circuit integration module. The PV power generation unit and the polymer thermoelectric power generation unit are partitioned and mounted on the same flexible strip substrate. Microstructured channels are pre-set within the skin-contact thermal interface layer to guide sweat and reduce contact thermal resistance. A process route is adopted where the organic PV is first fabricated and encapsulated with high barrier properties, followed by the printing of the polymer thermoelectric power generation unit. A porous fabric or fin array heat dissipation structure is integrated at the cold end of the polymer thermoelectric power generation unit. This invention can improve photoelectric conversion efficiency, stabilize operating temperature difference, reduce contact thermal resistance, increase manufacturing yield, enhance output power, and improve wearing comfort.

This invention discloses a method for controlling porosity and shrinkage cavities in large-size equiaxed crystal high-temperature alloy castings, belonging to the field of investment casting technology. The method includes: (1) wrapping the large-size casting shell with asbestos, then placing the asbestos-wrapped shell into a sand box, wherein the sand box is modified according to the asbestos-wrapping molding process of the casting; (2) smoothly loading the sand box containing the shell into a muffle furnace for shell pre-firing; (3) using a shell transfer cart to transfer the shell to the ingot mold chamber of a vacuum smelting equipment for smelting, and then casting to obtain a large-size equiaxed crystal high-temperature alloy casting. This method reduces or eliminates the tendency to form porosity and shrinkage cavities by controlling the temperature field of the sand box and the shell transfer time.

The utility model discloses a water cooling screen and a single crystal furnace. In the water cooling screen, an annular cooling water channel is formed in the body, and the water inlet channel and the water outlet channel are both communicated with the annular cooling water channel of the body; an annular cooling water channel is formed in the additional cooling cavity; the water inlet channel and the water outlet channel are also communicated with the annular cooling water channel of the additional cooling cavity; the additional cooling cavity and the body extend in the same direction, a bottom opening of the additional cooling cavity is located above a top opening of the body, and the outer diameter of the additional cooling cavity is smaller than the inner diameter of the top of the body. The cooling effect of the water cooling screen is improved, and the equal-diameter growth rate of the single crystal furnace is improved.

The invention relates to the technical field of wearable electronic equipment, and particularly discloses a partitioned double-sided skin-attaching perspiration type mixed energy collection arm band and a preparation method thereof, and the arm band comprises a flexible band-shaped substrate, an organic photovoltaic power generation unit, a polymer thermoelectric power generation unit, a skin-attaching heat conduction interface layer, a cold end heat dissipation structure and a circuit integration module. An organic photovoltaic power generation unit and a polymer thermoelectric power generation unit are arranged on the same flexible strip-shaped substrate in a partitioned mode, and a micro-structure channel is preset in a skin-attaching heat conduction interface layer to dredge sweat and reduce contact thermal resistance; a process route of firstly completing organic photovoltaic preparation and high-barrier packaging and then printing a polymer thermoelectric power generation unit is adopted; a porous fabric or fin array heat dissipation structure is integrated at the cold end of the polymer thermoelectric power generation unit. The photoelectric conversion efficiency can be improved, the working temperature difference can be stabilized, the contact thermal resistance can be reduced, the preparation yield can be improved, the output power can be enhanced, and the wearing comfort can be improved.

This invention discloses an indirect internal reforming solid oxide fuel cell connector, belonging to the field of fuel cell technology. The connector includes an anode plate, a reforming plate, and a cathode plate connected sequentially, all three plates being integrally formed. The reforming plate has a porous region for hydrocarbon fuel flow and for the reforming reaction to occur; the porosity gradient of the porous region decreases along the direction of hydrocarbon fuel flow. The cathode plate, anode plate, and reforming plate each have through holes for the flow of at least one of hydrocarbon fuel, reforming gas, and oxidizing gas; the through holes for hydrocarbon fuel flow are connected to the porous region. The anode plate and cathode plate, on the side away from the reforming plate, respectively have a first flow channel for the flow of reforming gas and a second flow channel for the flow of oxidizing gas. This connector avoids the damage to the battery structure and the deterioration of battery performance caused by excessive local thermal stress due to direct internal reforming, as well as anode carbon buildup.

This utility model relates to a solidification mold for aero-engine blades, comprising a blade shell membrane, a base plate, a pouring head, a sprue, a runner, and a heat insulation plate. The heat insulation plate includes an inner heat insulation plate and an outer heat insulation plate. The outer edge of the inner heat insulation plate has multiple evenly distributed notches (I). The outer heat insulation plate has a fan-shaped structure with notches (II) on its inner side. Notches (I) and (II) form a channel with the same cross-section as the blade shell membrane. The outer heat insulation plate is detachably installed on the outside of the inner heat insulation plate. This utility model, through the combined design of the inner and outer heat insulation plates and the ingenious cooperation of notches (I) and (II), forms a channel that perfectly fits the cross-section of the blade shell membrane. This design significantly reduces the gap between the blade shell membrane and the heat insulation plate, improves the heat insulation effect, effectively prevents heat exchange at the gap, and achieves a higher and more stable temperature gradient. The detachable connection between the inner and outer heat insulation plates provides convenience for the placement and removal of the blade shell membrane.

An embodiment of the present specification provides a crystal growth apparatus, comprising: a crucible for accommodating a crystal growth raw material; at least part of the seed crystal support can be immersed in a melt formed by the crystal growth raw materials in the crucible; the seed crystal support comprises a seed crystal bonding surface; the supporting structure is connected with one side, opposite to the seed crystal bonding surface, of the seed crystal holder; and the cooling assembly comprises a flow guide structure arranged in the seed crystal support, and the flow guide structure is used for conducting flow guide on the cooling medium, so that the cooling medium cools the bonding surface of the seed crystal. The cooling assembly is arranged to cool the seed crystal bonding surface, so that the radial temperature distribution of the seed crystal bonding surface is more uniform, the temperature near the seed crystal bonding surface is lower, the temperature gradient of the seed crystal bonding surface in the axial direction and other areas of a melt is increased, and the growth rate and quality of crystals are improved.

All season self-regulating air closed loop enclosure wall, cover high quantitative configuration method and air flow regulation method. At present, there is a lack of related processing measures which can utilize external temperature to regulate indoor temperature and air flow direction in real time. The all season self-regulating air closed loop enclosure wall in the application comprises an outer light condensing cover body and a main wall body, the outer light condensing cover body is arranged outside the main wall body, a front receiving cavity is formed between the inner wall of the outer light condensing cover body and the outer wall of the main wall body, a light absorbing layer and a reflective coating are vertically arranged on the outer wall of the main wall body from top to bottom, the light absorbing layer and the reflective coating are both arranged towards the outer light condensing cover body, at least one upper air flow communication hole is processed on the top of the main wall body and communicates with the front receiving cavity, and at least one lower air flow communication hole is processed on the bottom of the main wall body and communicates with the front receiving cavity.

A stepped main heater for a single crystal furnace comprises a plurality of heating assemblies distributed in the circumferential direction of the single crystal furnace, gaps exist between the adjacent heating assemblies, a heating space is defined by all the heating assemblies, and each heating assembly comprises an upper heating plate and a lower heating plate which are distributed up and down. The upper heating plate and the lower heating plate are fixedly connected through at least one transition heating plate, all the transition heating plates surround to form a transition heating area, the space of the transition heating area is gradually reduced from top to bottom to form a stepped transition heating area, and the structure can be far away from a solid-liquid interface, so that the temperature gradient is more linear. Part of two adjacent lower heating plates are fixedly connected through a bottom heating plate, and the bottom heating plate extends towards the heating space. The temperature of the bottom of the molten silicon is improved, so that the temperature difference between the upper part and the lower part of the molten silicon can be improved, the temperature gradient in the whole molten silicon is remarkably improved, and the crystal defect caused by insufficient temperature gradient in the drawing process is reduced.

This invention discloses a stepwise thermal control method for improving the process and performance of laser additive manufacturing of nickel-based superalloys. It is based on a dual-laser additive manufacturing process, which includes a first laser and a second laser beam. During the printing process, for each printed layer, the first laser beam is first applied at 20 J / mm². 3 -40 J / mm 3 A low-energy-density laser preheats and partially melts the alloy powder layer on the substrate to optimize its adhesion and improve its stability. A second laser beam at 70 J / mm² is then used. 3 -110 J / mm 3 The high unit volume laser energy density completely melts the alloy powder layer; the alloy powder layer uses nickel-based high-temperature alloy powder. Therefore, this invention can suppress the burn-off of key elements (such as Al, Cr, Nb, etc.) in the alloy powder layer during the melting stage, achieving precise control of component composition and improving surface quality and dimensional accuracy.