284results about How to "Improve convective heat transfer coefficient" patented technology

The invention discloses a near-wall air device for preventing the high-temperature corrosion of the water-cooled wall of a power station boiler, which comprises an air duct, a regulating valve, a near-wall air box, near-wall air unit nozzles, a fuel component on-line monitor and a speed measuring device, wherein the direction of the near-wall air is parallel to the axis of a pipe of the water-cooled wall, the resistance along the course is small and the air speed reduction is slow; only one layer of near-wall air nozzles is required to be arranged in a burner area and the system structure is simple; and the nozzles are flexibly arranged, the nozzle cooling condition is good, the operational air volume is small and the stability is high. Thus, the device is suitable to be promoted for preventing the high-pressure corrosion of the water-cooled walls of power station boilers.

The invention discloses a condenser which is composed of a porous micro through heat exchange flat tube, a corresponding connecting header and a heat dissipation back plate arranged at one side of the heat exchange flat tube. In the invention, the structure is compact, the heat exchange efficiency is high, the aluminum flat tube is adopted, thus the condenser is more advantageous than the existing copper heat exchange tube in the aspect of economical efficiency, and the condenser is suitable for the fields such as refrigeration, chemical engineering, energy source, heat exchange and the like. The condenser is characterized in that on the one hand, since the porous micro channel flat tube structure is adopted, the coefficient of heat transfer in the tube is improved, and simultaneously the flow resistance of a refrigerant in the tube is reduced; and on the other hand, the contact type of the condenser and the side wall of the heat dissipation back plate is surface contact, so that contact thermal resistance is reduced, the average temperature of the side wall of the heat dissipation back plate is improved, and the heat exchange between the side wall of the back plate and the ambient air is strengthened, namely the condensing effect is strengthened, thus, when the lengths of pipes are the same, the quantity of the condenser can be increased, or when the heat exchange quantities are the same, the length of the pipes can be reduced, therefore the condenser is more compact, simultaneously the material consumption is reduced, and the condenser has a certain advantage in the aspect of economical efficiency.

The invention disclosed a lying posture turnover cylinder cracking furnace which is used in the successive thermal cracking of a waste steel-wire tyre material. There's a below stack gas inlet and a top stack gas outlets on the outside tube of the cylinder; inside being positioned inner turning-over tube drived by transmission system; one side of the inner tube connects the tyre spiral feeder which can change the pitch, and the other side connects the static split product gathering trunk; on the top of the gathering trunk is the outlet of the gas hydrocracking product, while below the gathering trunk is outlet of the solid hydrocracking product, the gathering trunk also connects the spiral discharging device. The waste tyre material which is transferred by the spiral feeder is repeatedly grabbed by the grabbing plank located on the inner wall and pushed to the outlet. The high temperature stack gas counterflows in the passage between the outside and the inside tubes, during the process of the material's axial direction translation and circular direction rotation, the material absorbs the conducted calory from the tube wall to finish the splitting process. The gas product is pulped away by the blower while the solid product is discharged by the spiral discharging device through the bottom canal orifice.

The invention belongs to the field of evaporative heat exchange equipment, and relates to a reinforcing heat transfer method for an evaporative heat exchanger. Gaseous working media which are subjected to heat exchange by a coil tube flow into an upper connector of the coil tube, condensed and cooled working media outflow from a lower connector, and a reinforcing heat transfer component is additionally arranged in tube bundles of the coil tube of part or all of tube passes to improve the heat transfer efficiency. In the coil tube component of the invention, the coil tube is subjected to the processing of an integrally-finned expansion heat exchange surface partially or completely according to the properties of the condensed or cooled working media and the requirement of tube resistance; fins are machined by made-to-measure dies independently, and structures and shapes of the fins can be adjusted; the fins are arranged in a direct-insert mode, are convenient, flexible and have low manufacturing cost; the support action supplied by a core tube can ensure the contact area between the fins and an outer tube fully, and reduce the contact heat resistance of the internal fins furthest. The coil tube component adopting the integrally-finned reinforcing heat transfer component has the advantages of occupied space saving, large heat exchange rate of unit volume, high heat exchange efficiency and small appearance dimensions of a complete machine.

The invention discloses a gas direct contact type ice slurry preparation system. The system comprises three parts of refrigerant circulation, gas circulation and ice-making solution circulation, wherein a refrigerating medium adopts an environmental-friendly gas, such as air, nitrogen, and the like. Compared with a liquid refrigerating medium, the gas with same mass can generate more air bubbles in an ice slurry generator so as to increase the heat exchange area; the gas is easier to realize higher gas inlet speed so as to promote the diffusion of the air bubbles; the temperature distribution in the ice slurry generator is more even, the local supercooling is prevented, and the probability of generating an ice blockage is reduced. In addition, a first-class heat exchanger is adopted in the system. A refrigeration system evaporator is arranged in the first-class heat exchanger, and a refrigerating medium gas directly contacts with solution (ethanediol solution) in the first-class heat exchanger to exchange heat. Because of the intensive disturbance function of the gas, the convection heat exchanging factor of the refrigerating medium and the evaporator is greatly increased, and the problem of larger heat resistance caused by direct convection heat exchange of the gas and the refrigerating system evaporator is solved. Accordingly, the gas with higher temperature passes through refrigerating medium solution with lower temperature, thereby achieving the aim for removing water in the gas and further reducing the probability of the ice blockage of the system.

A gravity-style heat pipe trapezoid-combined heating radiator solves the problems of existing heat pipe radiators that the height is limited; the radiation area is small; and the heat transmission coefficient is low and the application range is narrow. The gravity-style heat pipe trapezoid-combined heating radiator comprises a liquid medium collecting pipe, a heat exchanger, a fin radiation pipe, a waste-steam collecting pipe and a condensation returning pipe. The heating radiator is characterized in that a superheater is respectively connected with two ends of the liquid medium collecting pipe and the heat exchanger is positioned in the liquid medium collecting pipe and the superheater to form a U-shaped heat-exchanger assembly; two ends of the fin radiation pipe are connected with the superheater and the fin radiation pipe is arranged in an inclined manner and the head is adjacent to the tail; the waste-steam collecting pipe is arranged on the top of the superheater and connected with the superheater; and the upper end and the lower end of the condensation returning pipe are respectively connected with the top of the superheater and the liquid medium collecting pipe and the upper end of the condensation returning pipe is communicated with the waste-steam collecting pipe. The heating radiator has the advantages that the problems that the heat-transmission medium is condensed in the radiation pipe and the height of the radiator is limited are solved; the specification of the product achieves the big, intermediate and small series; and the application range is wider; and the different requirements of people can be satisfied.

The invention discloses a three-dimensional microchannel and pulsating flow heat dissipation device, which relates to the technical field of radiators, in particular to a novel three-dimensional microchannel heat dissipation device using pulsating or intermittent fluid and a 3D printing manufacturing method thereof. The heat dissipation device comprises a radiator, a pulse pump, a cooler and a connecting pipe; The heat sink is closely attached to the heat source, Connect the radiator by connecting the pipes, pulsating pump, cooler in series, The heat sink comprises a liquid injection port, a bottom layer heat dissipation structure, an intermediate layer heat dissipation structure, a top layer heat dissipation structure, a liquid outlet, the bottom layer heat dissipation structure, the intermediate layer heat dissipation structure and the top layer heat dissipation structure, which are stacked in turn, and have good heat dissipation effect, and the heat dissipation effect is further improved after the device is made into an organic whole by adopting the 3D printing method.

The invention provides an ultrasonic reinforced micro-channel heat exchanger. The heat exchanger comprises a shell, a water-cooling system, micro pin fins, an ultrasonic generator and an ultrasonic transducer, wherein the water-cooling system comprises a cooling water channel, a water inlet and a water outlet; the cooling water channel is arranged in the shell; the water inlet and the water outlet are connected with the cooling water channel to form the water-cooling system; the shell comprises a channel main body and an upper sealing cover; the channel main body and the upper sealing cover are connected in a sealing manner; the micro pin fins and the cooling water channel are arranged in the channel main body; the micro pin fins are arranged along the axial direction of the channel main body; the cooling water channel is formed in the spaces among the micro pin fins, and the spaces between the micro pin fins and the inner wall of the channel main body; ultrasonic transducer oscillators are distributed on the two sides of the channel main body; and the ultrasonic generator is connected with the transducer through a wire. According to the ultrasonic reinforced micro-channel heat exchanger, the ultrasonic generator is adopted to give out high-frequency signals to enable the transducer to generate ultrasonic vibration; an ultrasonic cavitation effect generated by the cooling water is changed into an ultra-turbulent flow state, so that the cooling effect is reinforced; and in addition, dirt in the channel can be cleaned at any time, and the heat transfer resistance is lowered.

The invention discloses a cobweb type micro channel heat radiation apparatus. The cobweb type micro channel heat radiation apparatus includes a substrate, and is characterized in that the bottom of the substrate is provided with a fluid micro channel which is distributed uniformly in a cobweb shape; the center of the substrate is the central position of the fluid micro channel; the fluid micro channel radiates outward from the central position, and is displayed in the shape of circles with different diameter; the fluid micro channel takes the central position as the base to set *-shaped fluidmicro straight channels; the *-shaped fluid micro straight channels divide the fluid micro channel into 8 equal symmetrically distributed sectors; two ends of one of the *-shaped fluid micro straightchannels are respectively connected with cooling working medium inlet and outlet at the bottom of the substrate; and the inner wall of the fluid micro channel is wave-shaped, and a heat source is arranged at the central position of the substrate. The cobweb type micro channel heat radiation apparatus has the advantages of being simple in structure, being more uniform in overall heat radiation, andbeing able to improve heat radiation performance of a radiator.

The invention discloses a radiating fin with spherical protrusions. The radiating fin comprises a plate. A plurality of rows of pipe holes which are uniformly distributed are formed in the plate, each two adjacent rows of pipe holes are arranged in a staggered manner, and an outward step which is perpendicular to the fin is arranged at the edge of each pipe hole. The radiating fin is characterized in that the spherical protrusions which are uniformly distributed are further arranged on the plate, the pipe holes in each row and the corresponding spherical protrusions are arranged at intervals, and a row of corresponding spherical protrusions is arranged between each two corresponding rows of pipe holes. The radiating fin has the advantages that the structure and the shape of the fin are modified on the basis that the overall structure and raw materials of a heat exchanger are not changed, accordingly, a heat exchange coefficient can be increased, and influence of air layers which are formed at second defrosting stages on the defrosting efficiency can be reduced.

The invention relates to a regenerative desiccant heat exchanger and a manufacturing method thereof which belong to the technical field of refrigeration. The desiccant heat exchanger comprises a cooling system, a heating system and a desiccant heat exchange system, the desiccant heat exchange system can be further divided into a processing area and a regeneration area, the three systems are connected together through a pipeline, the processing area of the desiccant heat exchange system is connected with the cooling system through the pipeline, the regeneration area is connected with the heating system through the pipeline, and the continuous dehumidification can be realized by the mutual switch between a dehumidification area and the regeneration area. The invention respectively carries out the coating treatment of a drying agent of the heat exchanger or a metal sheet and then obtains the regenerative desiccant heat exchanger, the regenerative desiccant heat exchanger adopts chilled water and hot water of an inner tube for cooling and heating the drying agent, the convection heat exchange coefficient of the water is much higher than the convection heat exchange coefficient of gas, thereby being conductive to the dehumidification and the regeneration of the drying agent, leading the size of the device to be more compact and being capable of improving the comprehensive performance of the desiccant heat exchanger.

The invention belongs to the technical field of tea processing machinery and provides an oil-fired tea dryer. The oil-fired tea dryer comprises a dryer box body, a hot air generating system, a tea feeding system and a tea discharging system, wherein the hot air generating system is arranged above the dryer box body and is communicated with the dryer box body, the tea feeding system is arranged on one side of the dryer box body, and the tea discharging system is arranged at the bottom of the dryer box body. A tea conveying system is arranged in the dryer box body. The tea conveying system comprises at least two conveying layers. The feeding end of the tea conveying system is matched with the tea feeding system. The discharging end of the tea conveying system is matched with the tea discharging system. The hot air generating system, the tea feeding system, the tea discharging system and the tea conveying system are controlled by a control system which is arranged on the dryer box body. According to the oil-fired tea dryer, the structure of the dryer box body is optimized, the path through which hot air enters the dryer box body is shortened, the inner ventilation of the box body is improved, convective heat transfer coefficient is increased through layered conveyance and air intake, and energy loss is reduced.

The invention provides a compact type gas-gas heat exchange tube which comprises a heat transfer tube, an inner fin set and an outer fin set. The heat transfer tube is used for separating fluid insideand outside the tube and transferring heat between the fluid inside and outside the tube in a convection heat conduction mode; the inner fin set is used for expanding the inside heat exchange surfaceof the heat transfer tube, forming miniature fluid channels, separating the fluid in the tube, making the fluid flow in the axial direction of the heat transfer tube and meanwhile generating a turbulent flow effect and enhancing a convection heat exchange effect; the outer fin set is used for expanding the outside heat exchange surface of the heat transfer tube, forming miniature fluid channels,restraining the fluid outside the tube to reversely flow in the axial direction of the heat transfer tube and meanwhile generating the turbulent flow effect and enhancing the convection heat exchangeeffect; and holes are formed in fins of the inner fin set or/and the outer fin set. The invention further provides manufacturing and use methods of the compact type gas-gas heat exchange tube. Complete reverse flow efficient heat transfer is achieved under the heat exchange working condition of the limited space and the small tube number average temperature difference, the equipment spatial size is reduced, and meanwhile the weight of each area is reduced, so that the total weight and the manufacturing cost are reduced.

The invention provides a rib-line-type radiator and a manufacturing method. The rib-line-type radiator is characterized by comprising rib lines (8) and a heat conduction fixed plate (7) or a ring-shrouding cover (1). Rib foot ends (3) of a plurality of rib lines (8) are inserted in a hole of the heat conduction fixed plate (7), and the sections of the rib foot ends (3) of the plurality of rib lines (8) are connected in a welding mode or the sections of the rib foot ends (3) of the plurality of rib lines (8) are tighten to a bundle, and the ring-shrouding cover (1) is covered outside the bundle, and then the ring-shrouding cover (1) is crimpled through a crimpling jig technology, and at last, a heat transfer contact surface (5) of the radiator is processed through turning or grinding until all end surfaces (4) of the rib feet and the bottom surface of the heat conduction fixed plate (7) or the bottom end surface of the ring-shrouding cover (1) is neat and smooth. The rib-line-type radiator is high in heat dispersion, simple in production technology, high in material using rate, and has an unprecedented significance in pushing forward with and popularizing a present semiconductor solid state lighting technology with high heat dissipation costs.

The invention discloses a heat radiation mobile phone shell, including a shell. An energy source part and a refrigeration part are arranged on an outer surface of the shell, the energy source part includes a battery, the refrigeration part includes a semiconductor refrigeration unit and a fan refrigeration unit which are connected in parallel at two ends of the battery, the semiconductor refrigeration unit includes a switch and a semiconductor refrigeration sheet which is formed by joining an N type semiconductor material and a P type semiconductor material, and the fan refrigeration unit includes a fan, a motor and a switch. Compared with the prior art, a heat radiation method of the heat radiation mobile phone shell effectively relieves heat generation of a mobile phone, thereby preventing damage of the mobile phone battery, reduction of the life of the battery and damage of a CPU due to overtemperature, and improving use comfortableness.

The invention provides a heat exchange device. The heat exchange device is used for exchanging heat with a battery and comprises a first flat plate and a second flat plate, wherein the second flat plate is connected to the first flat plate in a butt joint mode; the second flat plate comprises a concave part so as to form a cavity with the first flat plate and further comprises a plurality of firstfinger-shaped partitions extending from a first side end to a second side end and a plurality of second finger-shaped partitions extending from the second side end to the first side end; the multiplefirst finger-shaped partitions and the second finger-shaped partitions are arranged in a staggered mode so as to enable the cavity to form a circuitous flow channel; and turbulent flow pits which aresunken towards the outside of the flow channel are arranged on the flow channel.