87results about How to "Control temperature difference" patented technology

The invention provides a temperature-control cooling system for a large-size concrete structure and a cooling control method of the temperature-control cooling system, and relates to the technical field of large-size concrete construction by aiming at the problems that in the existing method, the arrangement blindness of cooling pipes is great, the inside temperature distribution rule of the concrete cannot be well combined, and the inside temperature reduction uniformity of the cooling pipes cannot be effectively controlled. Cooling water pipe units are horizontally arranged in a template, and comprise two cooling water pipe groups, the two cooling water pipe groups are staggered and overlapped, the cooling water pipes of the two cooling water pipe groups are parallel and are separately arranged, and the flowing directions of cooling circulation water in the adjacent cooling water pipes are opposite. The method comprises the following steps that 1, a finite element model is created, and in addition, the water thermalization analysis is carried out for judging the highest temperature difference and the temperature gradient; 2, the arrangement scheme of the cooling water pipe units is primarily determined; 3, the information of the arrangement scheme is substituted into the finite element model for analogue simulation, when the judging result is assertive, the construction is carried out according to the arrangement scheme, and when the judging result is negative, the arrangement and the flow rate of the cooling water pipe units are regulated until the requirements are met.

The invention discloses a temperature gradient controlled mass concrete for bridges. The mass concrete comprises an inner layer of low-temperature rise anti-crack concrete I, a middle layer of low-temperature rise anti-crack concrete II and an outer layer of high-tenacity high-crack resistance concrete from the inside to the outside. According to the mass concrete disclosed by the invention, under combination of the low-temperature rise anti-crack concrete (the inner layer of low-temperature rise anti-crack concrete I and the middle layer of low-temperature rise anti-crack concrete II) and the high-tenacity high-crack resistance concrete structure, hydration heat of cementing materials on various layers is respectively absorbed through the characteristics of a high phase-transition temperature of a composite temperature control material in the inner layer of low-temperature rise anti-crack concrete and a low phase-transition temperature of a composite temperature control material in the middle layer of low-temperature rise anti-crack concrete; the inside and the middle temperatures of the concrete are lowered; meanwhile, different thicknesses and layout forms of two concrete materials are optimized and designed; reduction of the temperature difference between the layers is achieved; the overall temperature stress level is reduced; the technical problem of crack of the mass concrete widely existing in bridge engineering can be effectively solved; and the temperature gradient controlled mass concrete for the bridges is applicable to popularization and application.

Resist coated wafers are rapidly and uniformly cooled by a fluid that has been cooled through the Joule-Thompson effect. Fluid from a high pressure reservoir is vented into a chamber that contains the substrates. By varying the pressure difference between the reservoir and the chamber, the temperature of the cooling fluid entering the chamber can be controlled. By also controlling the flow rate through the chamber, the average temperature difference between the fluid in the chamber and the substrates may be limited, whereby more uniform cooling is obtained. While the chamber pressure is lower than that in the high pressure reservoir, the chamber pressure may still be substantially greater than atmospheric. An elevated chamber pressure raises the specific heat and residence time of the fluid in the chamber, which also promotes uniform cooling.

The invention discloses an ultra-supercritical secondary re-heating steam turbine set. The ultra-supercritical secondary re-heating steam turbine set comprises a first bearing box, an ultra high pressure-high pressure cylinder, a second bearing box, a medium-pressure cylinder, a third bearing box, a first low-pressure cylinder, a fourth bearing box, a second low-pressure cylinder and a turning gear box which are assembled on a rotor in sequence. The capacity of the steam turbine set is 1000-1300MW, the ultra high pressure-high pressure cylinder is of a cylinder combined structure, the pressure of a steam inlet of an ultra high pressure part is 30-35MPa, the temperature is 600 DEG C, the pressure of a primary re-heating steam inlet of a high pressure part is 10MPa, the temperature is 610-630 DEG C, the medium-pressure cylinder, the first low-pressure cylinder and the second low-pressure cylinder are respectively of a double-flow-division structure, the medium-pressure cylinder provides steam for the first low-pressure cylinder and the second low-pressure cylinder respectively through communication pipes, the pressure of a secondary re-heating steam inlet of the medium-pressure cylinder is 2.8MPa, and the temperature is 610-630 DEG C. The ultra-supercritical secondary re-heating steam turbine set has the advantages of being large in capacity, high in parameter, small in occupied space, low in investment cost, stable and reliable in operation and obvious in economical benefit, saving energy, reducing consumption and the like.

Disclosed in the present application is a thermal management device for a battery pack. The thermal management device comprises: a battery box, the circumference of the inner wall of which outwards protrudes; two first heat-dissipation plates, provided with bidirectional fans; a second heat-dissipation plate, provided with a plurality of heat-dissipation fans; two heating and heat-dissipation plates, provided with a plurality of ventilation holes; and a heater; and a battery management circuit. The thermal management device for a battery pack in the present application creatively resolves the contradictive demands of a battery box body between the demand for a good heat-dissipation structure and the demand for a good heating and heat preservation structure in the prior art, thereby ensuring that a batty packet in a battery system carries out charging and discharging work in a proper environment, controlling the temperature increase and the temperature difference in the battery box, improving the cycle life of the battery pack, and reducing a variety of safety risks caused by a high temperature and a low temperature.

The invention discloses a method for controlling the head and tail temperature difference of a semi-endless rolled overlong casting blank, which is used for solving the problem of poor longitudinal temperature uniformity of an overlong casting blank in a semi-endless rolling process. The invention has the technical scheme that the method comprises the following steps of: making the overlong casting blank enter a soaking pit at a fixed blank pulling speed V0 and making the overlong casting blank advance at a speed V1 not higher than V1max after the tail of the overlong casting blank passes through an accelerated point until the head of the casting blank arrives at the tail end of a heating section, wherein V1 is not less than V0 and not greater than V1max; then making the overlong casting blank advance to the tail end of a blank discharging section at a speed V2; and finally making the overlong casting blank enter a rolling mill at a speed V3 matched with a rolling mill F1 until that the tail of the casting blank leaves the soaking pit. The method has no influence to production rhythms, can also ensure the temperature uniformity of the semi-endless rolled overlong casting blank, greatly reduces the head and tail temperature difference of the overlong casting blank, has the advantages of simple process control and convenient field operation and can further save energy sources.

The valve rod mechanism for super high temperature and super high pressure valve includes upper valve rod, lower valve rod connected to the upper valve rod, valve rod head fixed to the end of the lower valve rod, protecting jacket around the lower valve rod and with lower end fixed to the valve rod head and upper end matched with the slide sleeve around the upper part of the lower valve rod, heat isolating layer between the protecting jacket and the lower valve rod, and cooling gas pipe inside the lower valve rod communicated with the gas inlet. The present invention has effectively controlled inner and outer temperature difference of valve rod body, raised valve rod strength, compact structure, high reliability and long service life.

The invention discloses an insert type air preheater with the same inlet-outlet temperature difference of heat exchange tubes, comprising an air bellow and a plurality of rows of heat exchange tubes, wherein the upper end of the air bellow is provided with a cold air inlet, the lower end of the air bellow is provided with a hot air outlet, one side of the air bellow is provided with a smoke inlet, the other side of the air bellow is provided with a smoke outlet, the heat exchange tubes are evenly arranged in the air bellow and communicated with the cold air inlet and the hot air outlet, the heat exchange tubes are internally provided with inserters comprising straight sections and spiral sections, the straight sections are arranged at the inlet sections of the heat exchange tubes, and the spiral sections are arranged at the outlet sections of the heat exchange tubes. The percentage of the lengths of the straight sections of the inserters in each row of the heat exchange tubes in total length is gradually decreased from the smoke inlet to the smoke outlet. The insert type air preheater with the same inlet-outlet temperature difference of heat exchange tubes can reduce tube wall temperature differences among the heat exchange tubes to enable air to be heated in the heat exchange tubes to have the same inlet-outlet temperature difference, thereby achieving the optimal comprehensive heat exchange effect.

The invention discloses a micro solder joint thermal migration test structure and a production method thereof, and belongs to the field of production and connection of materials. A solder pad for thermal migration test has a raised shape, is adhered to a base plate through a double-faced adhesive tape, a solder paste is filled between two solder pads, the two solder pads are welded to form a solder joint, and the solder joint is polished to form a solder joint for thermal migration test. One ends of the solder pads of the solder joint are heated by ceramic heating pieces, a thermocouple monitors the ceramic heating pieces, a controller is used to control the temperature, and the other ends of the solder pads keep a room temperature state, so two ends of the solder joint have a temperaturedifference, and stable temperature gradient is realized. The temperature controller is arranged to control the temperature of one ends of the solder point solder pads and realize the accurate controlof the temperature difference between two ends of the solder point, so two sides of the solder joint have the controllable temperature gradient, the problem of difficult realization and control of thetemperature gradient in the thermal migration test process of the micro-size solder joint is solved, reliable solder joint thermal migration data is obtained on the premise of the controllable solderjoint temperature gradient, and is evaluated.

The invention discloses a method for preparing a steel-aluminum composite board through an electromagnetic induction heating and rolling process. The method for preparing the steel-aluminum compositeboard through the electromagnetic induction heating and rolling process comprises the steps of S1, surface pre-treatment of a board; S2, blank assembling and fixing, specifically, after a steel plateand an aluminum plate are stacked, a gasket is placed between the steel plate and the aluminum plate to reserve a gap, and the steel plate and the aluminum plate are fixed with rivets; S3, induction heating of an assembled blank, specifically, the temperature of the steel plate can be rapidly increased to 750-1000 DEG C under the effect of vortex heating of a ferromagnetic material, the temperature of the aluminum plate is increased to 100-300 DEG C, and thus, a temperature difference over 500 DEG C is generated between the steel plate and the aluminum plate; S4, rolling, specifically, the heated blank is conveyed into a rolling machine; and S5, annealing and straightening. According to the method for preparing the steel-aluminum composite board through an electromagnetic induction heatingand rolling process, the requirement for the capacity of the rolling machine is greatly lowered, the deformation rate of a steel-aluminum rolling composite critical surface is greatly decreased, andcooperative deformation of steel and aluminum is achieved; and the obtained steel-aluminum composite board has good bending resistance and high bonding performance, the work hardening of the steel-aluminum composite board is greatly reduced, and the subsequent machinability is improved.

The invention discloses a jet and insert combined air pre-heater capable of realizing same inlet/outlet equal temperature difference of gas in heat exchange pipes. The combined air pre-heater comprises a bellows and a plurality of rows of heat exchange pipes, wherein the bellows is provided with a cold air inlet and a hot air outlet, one side of the bellows is provided with a flue gas inlet, and the other side of the bellows is provided with a flue gas outlet; the plurality of rows of heat exchange pipes are arranged in the bellows and divided into a jet area and an insert area, the jet area is arranged at one side close to the flue gas inlet, and the insert area is arranged at one side close to the flue gas outlet; and the cold air inlet sequentially passes through the jet area and the insert area and then is communicated with the hot air outlet. Through the jet and insert combined air pre-heater capable of realizing the same inlet/outlet equal temperature difference of gas in the heat exchange pipes, the pipe wall temperature difference among the heat exchange pipes can be reduced, and the air heated in the heat exchange pipes has the same inlet/outlet temperature difference andthe optimal comprehensive heat exchange effect.

The invention relates to a novel liquid cooling module with a multi-channel thin-wall straight pipe structure. The novel liquid cooling module comprises a battery cell bracket, wherein the battery cell bracket comprises an upper bracket plate and a lower bracket plate; the upper bracket plate and the lower bracket plate are symmetrically provided with a plurality of battery cell fixing grooves; abattery cell is fixedly arranged in each battery cell fixing groove; a liquid cooling module is sheathed under the connecting end of the upper bracket plate and each battery cell, and consists of a left harmonica vertical pipe, a right harmonica vertical pipe and a plurality of harmonica transverse pipes; the harmonica transverse pipes are welded between the left harmonica vertical pipe and the right harmonica vertical pipe; a plurality of triangular aluminum blocks are respectively welded at the two sides of each harmonica transverse pipe; the outer end surface of the left harmonica verticalpipe is provided with a liquid inlet, and the outer end surface of the right harmonica vertical pipe is provided with a liquid outlet. The novel liquid cooling module has the beneficial effects that by adopting the multi-channel straight pipe parallel type liquid cooling module, the structure is simple, the installation is convenient, the liquid cooling module can be well attached with the batterycell, and the temperature rise of the battery cell and the temperature difference between the battery cell can be effectively controlled; by designing the light-weight structure, the energy density of the module is high, and the pressure drop is little.

The invention relates to a furnace door electric control switch of ceramic furnace, which is formed by electric transmission device and temperature controller, wherein the electric transmission device comprises a motor, a pressure controller, an universal angle device, a jointer and a transmission screw, while the motor and the pressure controller are connected via connector; the connector is arranged with pressurize control hole and anti-drop groove; the pressure controller is mounted with pressure control bolt and anti-drop bolt; the universal angle device is one flexible muffle, whose one end is connected to the pressure controller and another end is connected to the jointer; the transmission screw is connected to the jointer, while it is arranged with limit groove and positioning actor. The invention can full-automatically switch on the furnace door at special temperature and time, to effectively control the temperature difference between inside and outside space when the ceramic product has been sintered, to confirm the quality and reduce the producing cost.

The invention relates to an intelligent control system for flue gas waste heat utilization of a thermal generator unit. The system is provided with a heat exchange structure, a measurement sensing structure, a heat exchange optimization structure and an optimization control structure. The heat exchange structure can recover the waste heat of high-temperature flue gas at the tail of a boiler, and sends the waste heat to a condensation water heat exchange system through the intermediate heat exchange of a circulating water system. Based on parameters such as temperature and flow of flue gas, circulating water and condensate water, real-time feedback and calculation analysis are carried out on the waste heat utilization scheme. With maximum utilization of flue gas waste heat as a target, thecondensate water inlet/outlet position, circulating water flow and condensate water flow are adjusted to realize intelligent control of a waste heat utilization system, so that flue gas waste heat isrecycled and is fully used for assisting a steam turbine heater of the thermal power generating unit.

The invention provides equipment for preparing lipid nanospheres. The primary emulsion preparation part comprises a water phase tank, an oil phase tank and a multi-stage online dispersion machine; anda high-speed shear emulsification head is installed in the water phase tank. According to the equipment provided by the invention, combined emulsification is performed by the multi-stage online dispersing machine and the high-speed shear emulsification head in the equipment, so that stability of a primary emulsion is improved; the water phase tank in the equipment has the functions of water phasepreparation, emulsification and primary-emulsion final product temporary storage, and connection of the water phase tank and the top of the oil phase tank can realize cyclic shearing of a mixed phasein the multi-stage online dispersion machine while the oil phase tank is washed; and the equipment is simplified, reduces adhesion loss of the primary emulsion in the transfer process, and is suitable for industrialized production of the lipid nanospheres.

The embodiment of the invention discloses a cooling verification method of power transformer cooling equipment. The method comprises the following steps: establishing a temperature database of each part of a transformer without cooling equipment; then manufacturing a cooling fin model which is scaled down in an equal proportion; connecting to an oil cooling cycle; carrying out preheating through aheating device; finely adjusting the temperature of an oil cooling liquid by using a temperature fine adjustment device according to the temperature database; installing the heat dissipation equipment which is scaled down in the equal proportion; starting the heat dissipation equipment to detect the temperature change of a cooling fin; comparing acquired temperature change data with cooling simulation data; and completing cooling verification, wherein the cooling equipment includes a heat dissipation pipe, an oil outlet pipe, a heating box used for heating the oil cooling liquid, a pressure pump used for enabling the oil cooling liquid to flow circularly and an oil inlet pipe which are connected together in sequence. During usage, a fine adjustment assembly is utilized to control a temperature difference among the plurality of cooling fins in actual use so that simulation is more vivid.