75 results about "Annular fin" patented technology

The invention relates to the field of petrochemical equipment, and discloses a cobweb-shaped oil-water emulsification turbulator with turbulent flow fins, which comprises an oil-water emulsification pipe, a cobweb-shaped turbulator arranged in the oil-water emulsification pipe, and annular fins and bent fins fixed on the inner side of the pipe wall of the oil-water emulsification pipe, the annular fins and the bent fins are distributed in the axial direction of the oil-water emulsification pipe, the bent fins are arranged close to the cobweb-shaped spoiler, and a gap for fluid circulation is formed between the bent fins and the cobweb-shaped spoiler. A multi-scale composite turbulent flow field is constructed through cooperative cooperation of the annular fins, the bent fins and the cobweb-shaped spoilers, the annular fins can effectively damage a boundary layer of a pipe wall and enhance local shear force, so that oil drops leaning against the wall are separated from the pipe wall and guided to a central area of a pipeline, and the bent fins further guide fluid to deviate towards the center so as to reduce flowing dead zones. The net-shaped structure of the cobweb-shaped spoiler is used for continuously stretching, shearing and secondarily crushing oil drops, and the oil-water mixing uniformity and the emulsifying efficiency are remarkably improved under the combined action of the three parts.

The present invention belongs to the field of semiconductor technology, and discloses an embedded cooling chip with manifold microchannels, including a base substrate and a manifold substrate, the base substrate and the manifold substrate are bonded to each other, the base substrate has a plurality of annular fins arranged in an array, the annular fins are hollow cylinders protruding upward from the bottom surface of the base substrate, and the inner ring forms a first through hole; the manifold substrate has a plurality of second through holes that penetrate up and down, the second through holes of the manifold substrate are aligned one by one with the first through holes of the base substrate, and the manifold substrate has a plurality of parallel coolant inlet and outlet channels. The present invention adopts a parallel manifold structure to make the coolant distribution on the chip more uniform; the through holes are used to form an annular fin structure, and there is no need to design an additional heat exchange channel or increase the chip height; the through holes penetrate the chip, and the conductive metal can be filled inside to achieve circuit connection of the stacked chips.

The invention discloses an automobile brake disc which comprises a disc body and a gooseneck protruding outwards from one side of the disc body, an annular groove is formed in the connecting position of the gooseneck and the disc body, the automobile brake disc further comprises an annular fin radiator arranged in the groove and a clamping spring arranged on one side of the annular fin radiator, and the annular fin radiator comprises a supporting seat and a plurality of layers of radiating fins which are arranged on the supporting seat and are concentrically distributed at intervals by taking the rotating axis of the disc body as the center. According to the automobile brake disc, the annular fin radiator is fixed in the groove formed in the connecting position of the gooseneck and the disc body through the clamping spring, heat generated by braking is guided out through the radiator by the disc body, and the situation that excessive heat is transmitted to a hub unit through the gooseneck, and the strength of a hub and the service life of peripheral plastic parts are affected is avoided.

The finned shell type heat exchanger comprises a heat exchange core arranged in a heat exchanger shell, a first end plate and a second end plate are fixedly arranged at two ports of the heat exchanger shell respectively, and a hot working medium inlet pipe and a hot working medium outlet pipe are arranged on the first end plate and the second end plate respectively; the heat exchange core body comprises a heat exchange pipe which is bent and twisted into a multi-layer space structure, the heat exchange pipe comprises a plurality of layers of heat exchange straight pipes which are arranged in parallel at intervals, the heat exchange straight pipes are arranged in the axial direction of the heat exchanger shell, and every two heat exchange straight pipes are communicated through a heat exchange bent pipe; annular fins are arranged on heat exchange straight pipes of the heat exchange pipes in a sleeving mode, a plurality of heat dissipation protrusions are arranged on the outer edges of the circumferences of the annular fins at equal intervals, and the heat dissipation protrusions are all arranged in the axial directions of the heat exchange straight pipes. Two ports of the heat exchange tube are respectively a cold working medium inlet and a cold working medium outlet; the heat exchanger has the advantages of realizing a heat exchange mode of parallel flow of cold and hot working media, reducing flowing resistance of the working media, and being large in heat exchange area, uniform in heat exchange, high in heat exchange efficiency and the like.

The invention discloses a petroleum coke calcination waste heat stepped recovery rotary kiln system, which belongs to the technical field of rotary kilns, and comprises a kiln body, the kiln body is sequentially provided with a preheating zone and a calcination zone, and the kiln body between the calcination zone and a kiln head is provided with a cooling zone. The cooling zone comprises a first-stage cooling heat exchange section and a second-stage cooling heat exchange section which are sequentially arranged towards the kiln head, the first-stage cooling heat exchange section is used for preheating secondary air, the second-stage cooling heat exchange section is used for cooling calcined coke and recycling heat energy, an annular fin-shaped cooler is arranged on the inner wall of the kiln body of the second-stage cooling heat exchange section, and the annular fin-shaped cooler is used for cooling the calcined coke. A kiln head cover of the kiln body is provided with a rotary joint, and the annular fin-shaped cooler is connected with the outside-kiln heat exchange station through the rotary joint. The cooling zone is arranged in the cylinder of the rotary furnace, secondary air is preheated through the first-stage cooling heat exchange section, heat is recycled in the second-stage cooling heat exchange section through double media of heat conduction oil and demineralized water in a stepped mode, the overall heat recovery rate is obviously increased, and sensible heat waste and comprehensive energy consumption are obviously reduced.

The invention relates to the technical field of separation, and particularly discloses a multi-stage gas-liquid separator which comprises a shell, and an inertial collision separation unit, a defoaming separation unit and a condensation separation unit which are arranged in the shell, a spiral collision plate in the inertial collision separation unit periodically changes the width of an inertial collision flow channel through up-down reciprocating motion to form a pulse type variable-diameter spiral channel, the separation effect of high-viscosity reaction byproduct liquid drops is improved, a bidirectional fluid path is formed by the inertial collision flow channel and a floating flow channel, and interstage backmixing is avoided; an outer silk screen and an inner silk screen in the defoaming and separating unit form a gradient interception barrier, and by combining directional back blowing of an inverted-cone-shaped back blowing piece, aerosol and gas are effectively separated, and meanwhile the silk screen blocking rate is reduced; the first annular fins and the second annular fins in the condensation separation unit are of a staggered distribution topological structure, a laminar flow boundary layer is broken, gas forms turbulent disturbance in the condensation separation unit, and the condensation droplet polymerization rate is increased.

The invention relates to the technical field of energy-saving devices in the field of ship engineering, and discloses an annular fin blade propeller cap turbine and a ship hull. The annular fins are uniformly distributed on the periphery of the light cap; the wing-shaped rotating direction of the annular fin blades is consistent with that of the propeller; the annular fin blades and the light caps form an annular closed area, and tip leakage is prevented. The annular fin tip prevents tip discharge, flow fields of the front fin blade and the rear fin blade are separated in advance near the annular fin tip, and cannot be fused to form vortex after being transversely scattered by the fin tip, so that the energy-saving effect is enhanced.

A vibration mechanism for a concrete finishing tool includes adapters for removable attachment to the tool and a device housing with a general chamber supporting a battery electrically connected to a vibrator assembly, which includes a vibrator housing with annular fins and openings that slow heat transfer and direct heat away from other components. Vibrator assembly components positioned in vibrator housing are a rotor with a rotor shaft and weighted body, a bearing supporting the rotor, a motor with an output shaft, a combination spacer with a resilient spacer band and a micro motor shaft seal positioned adjacent the motor and around the motor output shaft, and a resilient link between the rotor shaft and the motor output shaft. A resilient vibrator band around the vibrator housing transfers vibrations to the device housing and together with the combination spacer minimizes fluid leakage within the vibrator assembly and device housing.

The invention relates to the technical field of farm ventilation, and provides a farm ventilation system which comprises a mounting pipe, one end of the mounting pipe is detachably connected with a connecting pipe, and a plurality of air inlets are formed in one end of the connecting pipe in an annular array mode; two sealing plates are fixedly connected to an inner cavity of the mounting pipe, a plurality of thin pipes are jointly embedded in inner cavities of the two sealing plates in an annular array mode, a plurality of annular fins are distributed and fixedly connected to the surface of each thin pipe at intervals, a spiral flow guide rib is fixedly connected to an inner cavity of each thin pipe, and transition pipes are fixedly connected to the two ends of each thin pipe. The transition pipe is of a trumpet-shaped structure; by means of the technical scheme, the technical problems that in the prior art, ventilation equipment mostly adopts a single air suction and exhaust structure, only simple replacement of air inside and outside a farm can be achieved, and a targeted temperature adjusting function is lacked are solved.

The invention discloses a bionic stingray type underwater patrol robot based on annular fin propulsion, and belongs to the technical field of underwater robots, the bionic stingray type underwater patrol robot comprises a waterproof shell, an annular flexible fin and an annular fin propulsion mechanism; the annular fin propelling mechanism comprises an annular mounting plate, a plurality of first steering engines are uniformly arranged on the annular mounting plate in the circumferential direction, fin rays extending in the radial direction of the annular mounting plate are arranged at the output ends of the first steering engines, and the fin rays are fixedly connected with the annular flexible fins; the fin ray comprises a connecting base connected with the output end of the first steering engine, and a clamping jaw used for clamping the annular flexible fin is rotationally matched with the connecting base. A traditional propeller is replaced with bionic fluctuating propulsion of the annular flexible fins, the winding risk is fundamentally avoided, the bionic fluctuating fin propulsion mode is small in water flow disturbance and low in noise, the bionic fluctuating fin propulsion device is suitable for the environment sensitive to water flow or needing hidden operation, and interference to sea grass or surrounding ecology is avoided.

The supercharger shell comprises a shell body, side face protection shells are fixedly connected to the two ends of the shell body, a plurality of reinforcing ribs are fixedly connected to the inner wall of one side of each side face protection shell, a plurality of reinforcing blocks are fixedly connected between the two side face protection shells, and the reinforcing ribs are fixedly connected to the inner wall of one side of each side face protection shell. A first inclined face is arranged at one end of each reinforcing rib, a second inclined face is arranged on one side of each reinforcing block, an annular cooling fin is fixedly connected to the outer wall of one side of the side face protection shell, two rectangular grooves are formed in the circumference of the side face protection shell, and a first square pipe is connected between the two rectangular grooves in an inserted mode. And one side of the first square pipe is fixedly connected with a liquid inlet pipe, and a second square pipe is inserted between the other two rectangular grooves. The two ends of the shell body are protected through the side face protection shell, so that external impact force is prevented from being applied to the two ends of the shell body, the two ends of the side face protection shell are prevented from deforming, and use of the shell body is guaranteed.

The utility model discloses a high heat dissipation centrifugal clutch of an unmanned aerial vehicle, which belongs to the technical field of unmanned aerial vehicles and comprises a clutch shell, a clutch driving shaft is inserted in the middle of the clutch shell, and a plurality of equidistant annular fins are fixedly arranged on the outer wall of the circumference of the clutch shell. And a plurality of notches with equal angles are formed in the outer wall of the circumference of each annular fin. The clutch shell is made of the aluminum alloy material, the heat dissipation effect of the centrifugal device is effectively enhanced, the circumferential outer wall of each annular fin is provided with the notches with the same angle, the heat dissipation surface area of the clutch shell is greatly increased, the outer wall of the other end of the clutch shell is provided with the heat dissipation holes and the lightening holes, and the heat dissipation effect of the centrifugal device is improved. The weight of the clutch shell can be reduced, ventilation and heat dissipation are facilitated, compared with a traditional centrifugal clutch, the clutch shell prolongs the service life of the clutch, the stability of the clutch is improved, and torque transmitted by the clutch is kept efficient and stable.

The utility model provides a novel fin heat exchanger, this novel fin heat exchanger includes the heat exchanger frame body that is composed of upper and lower cover and left and right cover, is provided with metal finned tube in the exchanger frame body, is provided with a plurality of annular fins on metal finned tube, the both sides of heat exchanger frame body are provided with the collecting liquid pipe symmetrically, and the both ends of metal finned tube are connected on collecting liquid pipe. The utility model provides a novel fin heat exchanger, and the frame body structure enhances integral rigidity, reduces thermal expansion deformation risk, and the symmetrical collecting liquid pipe design makes fluid bidirectional even distribution, improves heat exchange evenness, and annular fin increases the heat dissipation area, strengthens the turbulence effect, improves heat exchange efficiency, thereby realizes high -efficient heat exchange, and improves stability.

The present application relates to the field of petrochemical equipment, and discloses a spider-web-shaped oil-water emulsion spoiler with spoiler fins, which comprises an oil-water emulsion pipe, a spider-web-shaped spoiler arranged inside the oil-water emulsion pipe, an annular fin fixed to the inner side of the wall of the oil-water emulsion pipe, and a curved fin, wherein the annular fin and the curved fin are distributed along the axis of the oil-water emulsion pipe, the curved fin is arranged close to the spider-web-shaped spoiler, and a gap for fluid flow is formed between the curved fin and the spider-web-shaped spoiler. Through the cooperative action of the annular fin, the curved fin and the spider-web-shaped spoiler, a multi-scale composite spoiler field is constructed. The annular fin can effectively destroy the boundary layer of the pipe wall and enhance the local shear force, so that the oil droplets close to the wall are separated from the pipe wall and guided to the central area of the pipe. The curved fin further guides the fluid to deviate to the center to reduce the flow dead zone. The network structure of the spider-web-shaped spoiler continuously stretches, shears and secondarily breaks the oil droplets. The three work together to significantly improve the uniformity of oil-water mixing and the emulsification efficiency.

The utility model discloses a composite tube plate finned tube type protective gas cooler, which relates to the technical field of protective gas coolers, and comprises a water inlet / outlet flange, a water chamber, an upper layer tube plate, a lower layer tube plate, a square flange, a plurality of heat exchange tubes and rolling type annular fins, each heat exchange tube is an integrally-formed U-shaped tube, and a plurality of through openings used for being connected with the heat exchange tubes are formed in the upper-layer tube plate. The heat exchange tube is an integrally-formed U-shaped tube, the whole tube is free of welding spots, structural blockage and cracking are avoided, the lower-layer tube plate, the composite linkage protection plate and the upper-layer tube plate are designed at the position where the heat exchange tube is connected with the water chamber, stability of the heat exchange tube is guaranteed in an external welding mode, meanwhile, a cavity is formed through the composite linkage protection plate, and the heat exchange tube is more stable. And the leakage detection assembly is arranged, leakage between the heat exchange pipe and the water chamber is monitored, and safety is high.

The utility model relates to an ascending pipe waste heat utilization device which comprises a heated section, a heat release section, a waste heat leading-out pipeline and a working medium leading-in pipeline. The heated section is composed of a lower collecting pipe, heat exchange vertical pipes and an upper collecting pipe, the multiple heat exchange vertical pipes are embedded in the pipe wall of the ascending pipe in the circumferential direction, and fins are arranged on one sides of the heat exchange vertical pipes; the heat release section is arranged in the furnace gas pipeline and consists of a plurality of annular finned tubes; one end of the annular finned tube is connected with the upper collecting tube through a waste heat leading-out pipeline, and the other end is connected with the lower collecting tube through a working medium leading-in pipeline; and a working medium inlet is formed in the waste heat leading-out pipeline close to the heat release section. The waste heat of the raw gas in the ascending pipe is recovered by the circulating working medium and used for heating the gas before entering the coke oven, so that the use amount of the heating gas of the coke oven can be effectively reduced, and the heat efficiency is improved; the ascension pipe waste heat utilization device is simple in structure and safe to use, molten salt is adopted as a working medium, an ultrasonic descaling device is arranged, and the inner wall of the ascension pipe is not prone to scaling.

The present invention belongs to the field of semiconductor technology, and discloses a 3D stacked chip with an embedded microchannel cooling structure, including a substrate, a shell on the substrate, a coolant inlet and a coolant outlet on the shell, a chipset in the shell, and the chipset is stacked by multiple chips. The coolant enters from the coolant inlet and flows out from the coolant outlet after passing through the chipset. The present invention adopts a parallel manifold structure to make the coolant distribution on the chip more uniform; through holes are used to form an annular fin structure, without the need to additionally design a heat exchange channel and increase the chip height; the through holes penetrate the chip, and the inside can be filled with conductive metal to achieve circuit connection of the stacked chips. The present invention arranges microchannels based on the structure of silicon through vias to maximize the number of microchannels; the manifold structure is used to evenly distribute the coolant to achieve efficient heat exchange.

To provide an in-wheel motor that improves radiation performance by using a flow of a wind caused by a traveling wind.SOLUTION: An in-wheel motor of the present invention is an in-wheel motor housed in an inside of a wheel, the wheel comprising: a tire mounting part to which a tire is mounted; and an annular fin that is formed on an outer circumferential surface the in-wheel motor and forms a flow channel for air flow between the fin and the tire mounting part.SELECTED DRAWING: Figure 2

The application provides a high-temperature heat exchanger for a Stirling engine and the Stirling engine, the high-temperature heat exchanger comprises a cylindrical shell, a circular ring fin group and a plurality of heat pipes, the circular ring fin group is arranged on the inner side of the cylindrical shell and the axes coincide, the plurality of heat pipes are embedded and penetrate through the cylindrical shell and the circular ring fin group along the direction perpendicular to the axis of the cylindrical shell, and the plurality of heat pipes are arranged in parallel with each other. The application realizes increasing the number of the arranged heat pipes, and further increases the contact area of the heat pipes and the circular ring fin group, reduces the circumferential temperature difference in the circular ring fin, enhances the overall heat exchange performance of the high-temperature heat exchanger, and improves the engine efficiency.

The invention relates to the field of metal smelting, in particular to a waste heat utilization energy-saving oxygen-enriched side-blown furnace which comprises a furnace body, a waste gas pipe and a discharge pipe. The furnace body is communicated with a waste gas pipe; the waste gas pipe is connected with a discharge pipe; the device further comprises a fixed seat, a box body and the like. A plurality of fixing seats are arranged on the rear side of the furnace body; the fixing seats are jointly and fixedly connected with a box body, and the inner side of the box body is coated with a heat insulation layer. The heating cylinder and the heat exchange cylinder are obliquely arranged, so that oil-containing substances flow to the lower side of the right side along the surfaces of the oblique heating cylinder and the heat exchange cylinder under the action of gravity of the oil-containing substances and finally flow into the temporary storage groove to be temporarily stored, and when passing through the annular fins, the oil-containing substances can flow through the rectangular grooves formed in the annular fins.

This invention discloses a rapid demolding device for insulating end plates, comprising an upper mold base, a lower mold base, a heat-conducting module, a support block, a bracket, and a lifting mechanism. The heat-conducting module and the support block are respectively installed in the stepped through holes of the lower mold base, and the bracket is inserted into the bottom wall of the heat-conducting module. Coolant is pre-introduced into the hollow cavity of the bracket to pre-cool the insulating end plate body of the lower cavity. Several fin gaps are opened on the heat insulation ring of the heat-conducting module to keep the annular fin portion in the several fin gaps at a high temperature. As the insulating end plate body cools and solidifies, the annular fin portion shrinks towards the connection part of the insulating end plate body, which helps to strengthen the shrinkage connection strength between the annular fin portion and the insulating end plate body. Furthermore, due to the shrinkage connection effect, the adhesion force between the annular fin portion and the insulating end plate body is weakened with the heat-conducting module, thereby solving the problem of tearing damage of the annular fin portion caused by excessive adhesion force during demolding.

The impeller comprises a hub and a plurality of blades arranged on the peripheral side of the hub, the blades are evenly distributed along the peripheral side of the hub at intervals, annular fins are coaxially arranged outside the hub, and the ends, away from the hub, of the blades are connected into a whole through the annular fins. And an internal flow guide cavity is formed among the blades, the hub and the annular fins. The ends, away from the hub, of the multiple blades are connected into a whole through the annular fins, so that the structural strength of the blades is ensured on the premise that the blades are integrally thin, and the purpose of ensuring the rigid strength of the impeller blades on the premise that the thickness of the blades is reduced to ensure the working efficiency of the blades can be achieved.

The utility model discloses a dry and wet integrated falling film heat transfer unit which is composed of a base tube (1), fins (2) and falling film channels (3). According to the dry and wet integrated falling film heat transfer unit, the falling film channel in the longitudinal direction of the base tube is created on the annular finned tube, the problem that a liquid film cannot be formed due to the annular finned tube is solved in the field of longitudinal falling film heat transfer, the finned tube is used for replacing a light tube, and the heat transfer efficiency is improved. Longitudinal finned tubes which are high in machining difficulty and low in finned coefficient are replaced with the annular finned tubes which are easy to machine and higher in finned coefficient, and the annular finned tubes are particularly suitable for falling film heat transfer of gravity assisted heat tubes and vertical heat exchange tubes.

The utility model relates to the technical field of energy, and discloses a cooling water pipeline for enhancing heat dissipation of cooling water, which comprises an inner pipeline, a pipeline outer wall is fixedly connected to the outer side in the inner pipeline, a plurality of annular fins are mounted in the pipeline outer wall, radiation refrigeration coatings are arranged on the outer sides of the annular fins and the inner pipeline, and the radiation refrigeration coatings are arranged on the outer side of the inner pipeline. One end of the pipeline outer wall is fixedly connected with a connecting assembly, the outer side of the pipeline outer wall is fixedly connected with a first flange plate, the outer side of the pipeline outer wall is fixedly connected with a second flange plate, and four connecting holes are formed in the second flange plate. According to the cooling water pipeline, the inner pipeline and the annular fins are matched with the radiation refrigeration coating, the heat dissipation area is increased, cooling water is dissipated in the transportation process, the heat dissipation performance of the cooling water pipeline is improved, the energy-saving performance of the cooling water pipeline is improved, and the cooling water pipeline has important economic value and social value and is easy to apply and popularize.

The utility model discloses a novel energy -conserving lamp, through the combination structure of split type stepped radiator and annular auxiliary radiator, cooperate the hinged design of double reflection cover, realize the combination of high -efficient heat dissipation and accurate light distribution. The main radiator adopts the stepped fin structure of three -level gradual change spacing, and the auxiliary radiator is equipped with annular fin group, and the reflection cover assembly includes relatively rotatable inner and outer double cover bodies, and realizes 0~120 degree stepless regulation through slide rail type angle adjusting mechanism. The structure can make the lamp operating temperature reduce by 30% or more, and the light efficiency utilization rate is improved by 45%, and simultaneously realizes the lightweight of lamp structure.

The application relates to the technical field of range extender generators, in particular to a new energy motor shell, which is provided with a water inlet and a water outlet on the shell, is provided with a first half annular water channel, a second half annular water channel and an annular water channel in the shell, the first half annular water channel and the second half annular water channel are symmetrically arranged in the diameter direction and are located at the same layer, the water inlet, the first half annular water channel, the annular water channel, the second half annular water channel and the water outlet are sequentially connected to form a series water channel, the first half annular water channel, the second half annular water channel and the annular water channel all include water channels which are arranged in parallel in more than two layers; the annular water channel is provided with an annular fin in the shell; and the annular fin is arranged on one side of the second layer annular water channel. The parallel annular water channel is adopted, the annular heat dissipation fin is additionally arranged in the heat dissipation water channel, the distribution of the cooling liquid is more reasonable, the motor heat dissipation condition is improved, the heat dissipation area is increased, and the heat dissipation efficiency is improved.

The invention relates to the field of industrial wastewater regeneration treatment and cyclic utilization in environmental protection, in particular to a waste sulfuric acid rotary evaporation treatment device which comprises a rotary evaporator and a gas-liquid separator mounted at the top of the rotary evaporator. According to the waste sulfuric acid rotary evaporation treatment device, when cleaning is needed, the scraping plate and the annular fin are automatically clamped, so that the annular fin has the effect of evaporating a waste sulfuric acid solution and also has the effect of driving the scraping plate to rotate, that is, the scraping plate can be driven to rotate under the condition that the bottom of the tank body is not provided with any opening; the bottom of the inner edge of the can body can be cleaned. Besides the effect of being clamped with the scraping plate, the triangular box can take out the waste sulfuric acid solution when the waste sulfuric acid solution is screwed out by the annular fin, so that the waste sulfuric acid solution can still be in contact with the annular fin, and equivalently, heat continuously acts on waste sulfuric acid.

The utility model discloses a shell-and-tube heat exchanger, which relates to the technical field of heat exchangers and comprises a shell, a first end cover, a second end cover, a plurality of heat exchange tubes and fluid guide tubes. The shell is of a cylindrical structure, a cold fluid inlet and a cold fluid outlet are formed in the side walls of the two ends of the shell respectively, a first end cover and a second end cover are arranged at the two ends of the shell, tube plates are arranged between the first end cover and the shell and between the second end cover and the shell, a hot fluid inlet is formed in the first end cover, and a hot fluid outlet is formed in the second end cover. The heat exchange tubes are arranged in the shell, the two ends of each heat exchange tube are connected to the tube plate so as to communicate with the first end cover and the second end cover, and a plurality of annular fins of an annular structure are arranged on the outer circumference of each heat exchange tube at intervals in the axial direction of the heat exchange tube; the fluid guide pipe is inserted into the hot fluid inlet and extends in the axial direction till abutting against the inner wall of the first end cover, and a plurality of through holes are formed in the side wall, close to the heat exchange pipe, of the fluid guide pipe. Therefore, the heat exchange efficiency of the heat exchanger can be improved.

The purpose of the present invention is to improve a heat radiation performance by using the flow of wind due to traveling wind in an in-wheel motor.　In order to achieve the above purpose, an in-wheel motor according to the present invention is housed in a wheel, the in-wheel motor being characterized in that the wheel comprises: a tire mounting portion on which a tire is to be mounted; and an annular fin that is formed on an outer surface of the in-wheel motor in the circumferential direction and forms a flow path through which air flows between the annular fin and the tire mounting portion.

The present invention provides a method for preventing secondary freezing of an air-energy heat pump heat pipe, comprising a gravity heat pipe arranged on the lower side of a main frame support of an air-energy heat pump group; the gravity heat pipe comprises a heat pipe condensation section, a heat pipe insulation section and a heat pipe evaporation section from top to bottom; the heat pipe condensation section is arranged above the ground surface; the heat pipe insulation section is arranged in a frozen soil layer; the heat pipe evaporation section is arranged in a constant temperature soil layer, an annular fin is arranged on the heat pipe condensation section, a drainage cushion layer is arranged above the ground surface, a heat storage hydrophobic sand and gravel layer is arranged above the drainage cushion layer, the lower section of the heat pipe condensation section is located in the heat storage hydrophobic sand and gravel layer, and the upper section of the heat pipe condensation section is located in the bottom space on the lower side of the main frame support of the air-energy heat pump group. The present invention has the characteristics of reasonable design and zero energy consumption in solving the problem of secondary freezing of condensed water in the bottom space of an air-energy heat pump.