46results about How to "Avoid thermal convection" patented technology

An illumination lamp comprises a lamp body, a light-emitting module, a power supply module, and a circuit module. The lamp body defines an inner space. The partitioning unit is disposed in the lamp body for dividing the inner space into a first space for receiving the power supply module, and a second space for receiving the circuit module. Due to the presence of the partitioning unit, thermal convection between the first and second spaces is prevented to reduce adverse influence of a high temperature of the circuit module on the power supply module.

The invention relates to a waterborne super thin steel structure fireproof coating and a preparation method Which is evidently different from the solvent-typed expansion foam fireproof coating, the invention solves the problems of environmental pollution, resource waste and high cost in prior solvent-typed super thin steel structure fireproof coating. The invention takes water as solvent and comprises the components with certain weight portions: water of 5-25 weight portions, waterborne resin or mixed waterborne resin of 10-30 weight portions, waterborne expansion additive of 25-50 weight portions, pentaerythritol or dipentaerythritol or starch of 5-15 weight portions, one or two components among urea, melamine and dicyano diammonium with 6-15 weight portions, ammonium dihydrogen phosphate, ammonium polyphoste or diammonium phosphate of 15-30 weight portions, expansion regulator of 3-18 weight portions, titanium dioxide of 3-12 weight portions, dispersion agent of 0.1-1.0 weight portions.

The invention discloses a heat insulation cold closet. According to the heat insulation cold closet, due to the fact that a vacuum heat insulation panel layer and a rigid polyurethane layer are arranged in a polyurethane foamed plastic layer to form a composite head insulation structure, the thickness of the heat insulation cold closet is reduced so that the effective volume of a heat insulation closet in the same shape can be greatly increased; furthermore, the coefficient of heat insulation of the heat insulation cold closet is smaller than or equal to 0.004W / mK, heat radiation, heat conduction and heat convection between the interior of the closet body and the outside environment can be effectively prevented, and the heat insulation closet can guarantee that the interior temperature is controlled below 2-8 DEG C for more than 120 hours. The heat insulation cold closet is mainly used for cold storage and refrigeration during transportation and storage of medicine such as vaccine, insulin, blood products, biological products and reagents.

The invention provides a light fixture for illuminating a sign. The light fixture has a lamp and one or more reflectors to provide for substantially uniform illumination of a sign with a minimum number of light fixtures. One or more of the reflectors of some embodiments can formed from a material having predetermined pattern for reflecting and transmitting light from the lamp. For example, the reflectors can be made from a neutral density polymeric material consisting of a translucent or substantially transparent polymeric substrate with a pattern of reflective media disposed on or within the substrate. In some embodiments, one of the reflectors can be a specular reflector. Some embodiments of the light fixture can also include a thermal shield to at least partially prevent thermal convection along a portion of the lamp.

The invention discloses a heat insulation box which comprises a box and a box cover. One side of the box is provided with an opening, and the box cover seals the opening. The box and the box cover comprise a first heat insulation layer, a second heat insulation layer and a shell, which are adjacent to one another sequentially from inside to outside. The first heat insulation layer is provided with a VIP (vacuum insulation panel), and the second heat insulation layer is provided with a foaming PU (polyurethane) plate. The structure of the heat insulation box can insulate a large amount of heat in external environment, heat insulation coefficient is not larger than 0.004W / m*K, and accordingly heat radiation, heat conduction and heat convection between the inside of the box and the external environment can be prevented effectively. Temperature of the heat insulation box can be kept at 2-8 DEG C continuously for more than 120 hours. The heat insulation box is mainly applied to the field of refrigeration, freezing and the like of medicaments such as vaccine, insulin, blood product, biological product and reagent in transportation and storage.

The invention discloses an aluminum alloy laminar flow distribution plane solidification casting device and a casting method thereof, and belongs to the technical field of aluminum alloy ingot blank casting. The device comprises a support. A translation flow distribution mechanism capable of moving horizontally is arranged on the upper portion of the support. A flow control mechanism is arranged at an outlet of the translation flow distribution mechanism. A casting tank is arranged below the translation flow distribution mechanism. A water spraying system and a cooling plate system are arranged below the casting tank. The method includes the steps that the cooling plate system rises into the casting tank, and molten aluminum alloy enters a flow distribution groove and then enters a guide rod sleeve; a second motor is started to control flow of the molten aluminum alloy; a first motor is started, a movable plate drives the flow distribution groove to move horizontally, and the molten aluminum alloy flows to a cooling plate upper plate body in a laminar mode; when an aluminum alloy solidification layer can be supported, a cooling plate oil cylinder is started, and thus the cooling plate system descends; then the water spraying system is pushed in, and sprayed water is cooled; the descending speed of a main oil cylinder is controlled until casting reaches a preset thickness; and after all the cooling is completed, water spraying is stopped, the water spraying system is extracted, ingot castings are taken out, and accordingly casting is completed.

The invention provides a power source thermal isolation high-power LED lamp. Safety and reliability of a power source of the high-power LED lamp can be improved, and adverse effects on a power sourcebin due to heat dissipation are lowered. In the power source thermal isolation high-power LED lamp, a front face cover, a light source plate and a heat dissipation shell form a light source bin. The power source bin is fixedly connected with the back of the heat dissipation shell. The power source bin and the heat dissipation shell are relatively independent, and a space is kept. A set of bosses are formed on the back of the heat dissipation shell and between heat dissipation fins. The bottom face of the power source bin is fixedly connected with the set of bosses through a set of screws, a space is kept between the bottom face of the power source bin and the heat dissipation fins below the bottom face of the power source bin, and fixed installation of the power source bin is achieved. Atleast one connecting column is further formed on the back of the heat dissipation shell. The connecting column is provided with a center channel communicating with the light source bin so as to achieve penetrating and connecting of circuits. The bottom face of the power source bin is provided with a connector matched with the connecting column, and a seal thermal isolation rubber ring is arrangedon the joint.

This invention relates to an electric sampling multiple tubes for capillary tube electrophoresis, which employs double-tube structure with diaphragm, wherein one is designed for sampling tube, the other is for electrode tube and they are used separately to receive electric sampling capillary tube and platinum electrode. And at the same time a porous diaphragm is located in the common inner tube wall between sampling tube and electrode to avoid the fluid flow between them. The diaphragm porosity is good at conductivity. The bottom of sampling tube is curved connected with its outer wall so as to effectively eliminate electric field blind angle. The invention effectively solves the problem of bubbling on electrode surface and fluid flow caused by heat diversity in traditional electric sampling, including field enlarging sampling.

The invention relates to a heat-insulated refrigerator for medical medicine, comprising a box body with an opening, and a cover body sealingly fitted with the opening; the box body is sequentially composed of a hard polyurethane layer and a vacuum insulation board layer , foamed polyurethane board and shell. In the heat-insulating refrigerated box of the present invention, since the vacuum insulation board layer and the rigid polyurethane layer are arranged in the polyurethane foam plastic layer to form a composite heat-insulating structure, not only the thickness of the heat-insulated refrigerated box is reduced, but also the same appearance The effective volume of the insulation box is greatly improved, and its thermal insulation coefficient is less than or equal to 0.004W / mK, which can effectively prevent heat radiation, heat conduction and heat convection between the inside of the box and the external environment. The heat insulation box can ensure that the temperature inside the box is within At 2-8°C, the duration is more than 120 hours; the insulated refrigerator of the present invention is mainly used for refrigeration and freezing of vaccines, insulin, blood products, biological products, reagents and other medicines during transportation and storage.

The invention belongs to the field of electron beam smelting, and in particular relates to a method for reducing the splashing of silicon liquid in a polycrystalline silicon electron beam smelting process. The method comprises the steps of material preparation, vacuumizing, pretreatment and smelting, wherein after the pretreatment step, the following steps are performed: (1) adjusting electron beam current, and heating and melting a silicon material; (2) adjusting electron beam spots to spirally move towards the circle center of a crucible along the upper edge of the inner wall of the crucible, causing the electron beam spots to reversely spirally move after the electron beam spots move to the circle center of the crucible, and repeating the spiral movement; (3) after the movement of the electron beam spots is completed, performing electron beam smelting. The method has the remarkable effects that silicon material loss caused by the splashing of the silicon liquid can be reduced, ablation in a vacuum cavity can be reduced, the hidden danger of stopping of an electron gun in case of sudden changes in pressure in the vacuum cavity caused by the splashing of the silicon liquid can be avoided, and a process is simple and easy to operate.

This invention relates to an electric sampling multiple tubes for capillary tube electrophoresis, which employs double-tube structure with diaphragm, wherein one is designed for sampling tube, the other is for electrode tube and they are used separately to receive electric sampling capillary tube and platinum electrode. And at the same time a porous diaphragm is located in the common inner tube wall between sampling tube and electrode to avoid the fluid flow between them. The diaphragm porosity is good at conductivity. The bottom of sampling tube is curved connected with its outer wall so as to effectively eliminate electric field blind angle. The invention effectively solves the problem of bubbling on electrode surface and fluid flow caused by heat diversity in traditional electric sampling, including field enlarging sampling.

A continuous steel casting method includes producing a strand. The producing of the strand includes pouring molten steel into a mold of a continuous casting machine and withdrawing a solidified shell from the mold, the solidified shell being a solidified portion of the molten steel. The method includes applying a static magnetic field to at least a portion of a region of the strand, the strand being in the continuous casting machine, the region being a region where a solid fraction fs at a thickness-wise middle position of the strand is in a given range, the static magnetic field having a magnetic field strength of greater than or equal to 0.15 T and being in a direction orthogonal to a direction in which the strand is withdrawn, the static magnetic field being applied at an application time ratio of greater than or equal to 10%.

The invention discloses an ultra-wide sunlight greenhouse internal heat preservation multilayer composite material and production equipment thereof, and relates to the technical field of agricultural facilities, the ultra-wide sunlight greenhouse internal heat preservation multilayer composite material comprises a first plane material layer and a second plane material layer which are respectively located on two side surfaces, and a heat insulation layer and an airtight layer are arranged between the first plane material layer and the second plane material layer; the breadth of the ultra-wide thermal insulation multilayer composite material in the solar greenhouse is 2500-6000 mm. According to the ultra-wide sunlight greenhouse internal heat preservation multilayer composite material and the production equipment, the technical problem that in the prior art, a multi-span greenhouse and a glass curtain wall greenhouse are poor in heat preservation is solved, and the heat preservation performance of the multi-span greenhouse and the glass curtain wall greenhouse can be enhanced; the method effectively solves the problem of half-year leisure, can effectively promote the development of facility agriculture in China, and has good popularization value.

The invention relates to a passive vehicle-mounted refrigerator, comprising an insulation box body and a refrigerant; the main body of the insulation box body is formed by a top wall part, a bottom wall part, a front wall part, a rear wall part, a left wall part and a right wall part; the left wall part is an openable structure; the front wall is provided with a front side door; each wall part comprises an outer shell layer, a vacuum thermal insulation panel and an inner shell layer; first hard polyurethane foam bodies are injected between the outer shell layers and the vacuum thermal insulation panels; second hard polyurethane foam bodies are injected between the inner shell layers and the vacuum thermal insulation panels. The passive vehicle-mounted refrigerator adopts the direct refrigeration mode that the refrigerant is vaporized to absorb heat and is diffused into the thermal insulation box body, and a power supply system powered by an electrical compressor does not need to be adopted, so the plot ratio of the whole cold storage refrigerator is greatly improved. Compared with the prior art, the passive vehicle-mounted refrigerator has the advantages that the investment is low and the transportation cost for the transportation of a few or different types of objects is obviously reduced.

A preparation method of a polyurethane resin including the following steps is provided. A liquid polyamine compound is placed in a continuous reaction system, and the liquid polyamine compound is circulated in the continuous reaction system. A solid bis(cyclic carbonate) and a solid catalyst are placed in the continuous reaction system to mix the solid bis(cyclic carbonate), solid catalyst, and liquid polyamine compound to form a heterogeneous mixture. The heterogeneous mixture is heated in the continuous reaction system in a microwave manner, such that the heterogeneous mixture reacts to form a polyurethane resin.

The invention provides a small-rotation-angle transmission device with a gap eliminating mechanism, which can be taken as a small-rotation-angle transmission system with a small rotation stroke, such as a declination axis. The small-rotation-angle transmission device comprises a transmission case and a rotating shaft, wherein the rotating shaft is externally provided with a shaft sleeve which is fixedly connected with the transmission case; a transmission shaft is provided with a pre-stretched spring; one end of the spring is fixed on the end face of the transmission shaft, and the other end of the spring is fixed on the shaft sleeve; when the rotating shaft rotates to any angle, rotating torque output from the spring is same. The small-rotation-angle transmission device provided by the invention adopts the spring to output the constant torque so as to implement transmission gap elimination, so that a motor and a drive circuit are omitted, the device cost and power consumption are saved, the motor is prevented from heating, and imaging quality is prevented form being reduced by thermal convection. The small-rotation-angle transmission device is simple in structure, reliable in performance, and not easy to be damaged.

The invention belongs to the field of electron beam smelting, and in particular relates to a method for reducing the splashing of silicon liquid in a polycrystalline silicon electron beam smelting process. The method comprises the steps of material preparation, vacuumizing, pretreatment and smelting, wherein after the pretreatment step, the following steps are performed: (1) adjusting electron beam current, and heating and melting a silicon material; (2) adjusting electron beam spots to spirally move towards the circle center of a crucible along the upper edge of the inner wall of the crucible, causing the electron beam spots to reversely spirally move after the electron beam spots move to the circle center of the crucible, and repeating the spiral movement; (3) after the movement of the electron beam spots is completed, performing electron beam smelting. The method has the remarkable effects that silicon material loss caused by the splashing of the silicon liquid can be reduced, ablation in a vacuum cavity can be reduced, the hidden danger of stopping of an electron gun in case of sudden changes in pressure in the vacuum cavity caused by the splashing of the silicon liquid can be avoided, and a process is simple and easy to operate.

The invention discloses a preparation method of EPE pearl wool for swarm heat preservation, which comprises the following operation steps: (1) adding epsilon-polylysine and aminated multi-walled carbon nanotubes into deionized water, and mixing and stirring to obtain an antibacterial agent; (2) adding shellac into an ethanol aqueous solution until the shellac is completely dissolved, adding the antibacterial agent into the solution, and performing ultrasonic water bath to obtain a modified antibacterial agent; (3) uniformly mixing and stirring coconut shell powder, white carbon black and diatomite, and adding an internal lubricant into the mixture to obtain a thermal insulation filler; and (4) feeding a modified polyethylene master batch, the modified antibacterial agent and the thermal insulation filler into a foaming machine for heating treatment, then adding a foaming agent to form a porous structure, and performing extruding, cooling, extending, and finally rolling to obtain the EPE pearl wool for swarm heat preservation. The prepared EPE pearl wool for swarm heat preservation has excellent heat preservation performance and excellent antibacterial performance, and bacteria canbe effectively prevented from breeding and reproducing on the surface of the EPE pearl wool.

The invention discloses an aluminum alloy laminar flow distribution plane solidification casting device and a casting method thereof, and belongs to the technical field of aluminum alloy ingot blank casting. The device comprises a support. A translation flow distribution mechanism capable of moving horizontally is arranged on the upper portion of the support. A flow control mechanism is arranged at an outlet of the translation flow distribution mechanism. A casting tank is arranged below the translation flow distribution mechanism. A water spraying system and a cooling plate system are arranged below the casting tank. The method includes the steps that the cooling plate system rises into the casting tank, and molten aluminum alloy enters a flow distribution groove and then enters a guide rod sleeve; a second motor is started to control flow of the molten aluminum alloy; a first motor is started, a movable plate drives the flow distribution groove to move horizontally, and the molten aluminum alloy flows to a cooling plate upper plate body in a laminar mode; when an aluminum alloy solidification layer can be supported, a cooling plate oil cylinder is started, and thus the cooling plate system descends; then the water spraying system is pushed in, and sprayed water is cooled; the descending speed of a main oil cylinder is controlled until casting reaches a preset thickness; and after all the cooling is completed, water spraying is stopped, the water spraying system is extracted, ingot castings are taken out, and accordingly casting is completed.

A continuous steel casting method includes producing a strand. The producing of the strand includes pouring molten steel into a mold of a continuous casting machine and withdrawing a solidified shell from the mold, the solidified shell being a solidified portion of the molten steel. The method includes applying a static magnetic field to at least a portion of a region of the strand, the strand being in the continuous casting machine, the region being a region where a solid fraction fs at a thickness-wise middle position of the strand is in a given range, the static magnetic field having a magnetic field strength of greater than or equal to 0.15 T and being in a direction orthogonal to a direction in which the strand is withdrawn, the static magnetic field being applied at an application time ratio of greater than or equal to 10%.