37 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 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.

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 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 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.

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 high-pressure die-casting dies, in particular to an annular runner die-casting die for high-pressure casting products, which comprises a movable die sleeve plate, a movable die core fixed in the center of the movable die sleeve plate, a forming cavity arranged in the middle of the movable die core and an annular runner positioned on the periphery of the forming cavity. The annular runner is provided with a plurality of flow gates, the flow gates are annularly arranged on the peripheries of the cooling fin ribs, and the opening directions of the flow gates are perpendicular to the arrangement direction of the cooling fin ribs. According to the scheme, the annular runner and the multi-inner-gate annular layout is adopted, so that metal liquid is synchronously injected into a cooling fin rib cavity in a multi-point mode, buffering of a stacked structure is weakened, filling is accelerated, and the metal liquid is prevented from being solidified and stagnated in advance; meanwhile, due to the design of the flow gates perpendicular to the arrangement direction of the radiating ribs, the pressure loss during die casting can be reduced, complete forming of the ribs is ensured, and the die casting quality is greatly improved.

The utility model discloses an ammonia storage device based on a granular physical adsorption material, which comprises a tank body, a gas guide pipe, annular fins and adsorption particles capable of adsorbing ammonia gas, and a plurality of outer fins are arranged on the inner side of the tank wall; the inner fins are arranged on the peripheral side of the inner gas-guide tube, the adjacent inner fins and outer fins are arranged at intervals, vent holes are formed in the peripheral side of the inner gas-guide tube, penetrating type openings are formed in the annular fins, and the space between the tank wall and the inner gas-guide tube and the space between the outer fins and the inner fins are filled with adsorption particles; adsorption particles are evenly distributed in the tank body through the annular fins, gas is diffused to the circumferential side through the vent holes in the inner gas guide pipe and adsorbed through the evenly-distributed adsorption particles, and meanwhile heat generated when the adsorption particles are adsorbed through the annular fins is transferred and dissipated. The gas storage efficiency of the ammonia storage device is improved; meanwhile, the ammonia storage device has relatively high safety.

The utility model discloses an energy-saving furnace cover which comprises an upper cover, a heat insulation layer and a lower cover. Wherein the middle part of the surface of the upper cover is processed to form an annular fin-shaped groove structure; a plurality of straight grooves or annular fin-shaped groove structures are formed in the periphery of the surface of the upper cover; the surface, facing the furnace body, of the lower cover is a mirror surface; and a heat insulation layer is filled between the upper cover and the lower cover. The light-weight LED lamp has a light-weight structure, can reduce heat dissipation, has good economic benefits and environmental benefits, and is worthy of popularization.

Inductively coupled plasma (ICP) analyzers use an ICP torch to generate plasma in which the sample is atomized and ionized. Analysis of the atomic ions can be performed using atomic analysis, such as mass spectrometry (MS) or atomic emission spectrometry (AES). Particle-based ICP analysis involves analyzing particles (e.g., cells, magnetic beads, or laser ablation plumes) by atomizing and ionizing them in an ICP torch chamber followed by atomic analysis. In mass cytometry, the mass tags of the particles are analyzed using mass spectrometry, such as ICP-MS. The systems and methods of this application include one or more of the following: a removable ICP torch holder assembly, an external ignition device, an ICP induction coil including annular fins, a particle-suspended sample introduction jet, and its ICP analyzer.

The utility model discloses an anti-abrasion device for a boiler economizer, and relates to the technical field of boiler economizers. The coal economizer comprises a coal economizer shell, a plurality of sets of heat exchange pipelines arranged at equal intervals are installed on the front side wall and the rear side wall of the coal economizer shell in an inserted mode, and a plurality of sets of annular fins are arranged on the surfaces, located in the coal economizer shell, of the heat exchange pipelines so that the contact area between the heat exchange pipelines and smoke can be increased. According to the heat exchanger, the flue gas can be guided to flow along the gaps between the adjacent heat exchange pipelines through the flue gas guide covers which are positioned below the heat exchange pipelines and are arranged corresponding to the heat exchange pipelines, so that the flue gas is prevented from directly impacting the surfaces of the heat exchange pipelines; the contact area with smoke is increased through the annular fins on the surfaces of the heat exchange pipelines, the heat energy exchange efficiency is improved, and large particles in the smoke are filtered and blocked through the ceramic filter plates between the smoke guide covers and between the smoke guide covers and the inner wall of the economizer shell.

The utility model discloses a finned shell heat exchanger, including the heat exchange core body that is equipped with in the heat exchanger shell, the both ends of heat exchanger shell are respectively fixed with end plate no.

The utility model provides a screen basket of a horizontal vibration discharging centrifugal machine, and belongs to the technical field of coal washing. Comprising a centrifuge screen basket body of a circular truncated cone structure, and a dewatering fin structure is arranged on the centrifuge screen basket body; the centrifugal machine screen basket body comprises a screen frame of a circular truncated cone structure, the top of the screen frame of the circular truncated cone structure is a screen basket small end, the bottom of the screen frame of the circular truncated cone structure is a screen basket large end, a plurality of screen strips are arranged between the screen basket small end and the screen basket large end of the screen frame along a circular truncated cone generatrix of the screen frame, and a plurality of sets of rib plates are symmetrically arranged in the generatrix direction of the screen frame. The dewatering fin structure comprises an annular fin arranged around the outer side of the screen frame and a plurality of parallelogram fins, wherein each parallelogram fin is axially arranged on the rib plate. Starting from the characteristics of a discharge flow field of centrifugate, the flow guide fins are additionally arranged outside the screen basket to regulate the flow field between the screen basket and the machine shell, an environment beneficial to liquid discharge is created, and the dehydration performance of the horizontal vibration discharge centrifugal machine is improved.

The invention relates to the technical field of heat dissipation, in particular to a paraffin and aluminum profile composite phase change energy storage heat dissipation shell which comprises a first cooling box and a second cooling box, a cooling circulation pipe is arranged between the first cooling box and the second cooling box, annular fins are arranged on the cooling circulation pipe, and the annular fins are arranged on the first cooling box and the second cooling box. The lower portion of the second cooling box communicates with a third cooling box, a partition plate is arranged in the third cooling box, one end of the third cooling box communicates with a cooling medium conveying box, a conveying unit is arranged in the cooling medium conveying box, and the third cooling box communicates with the first cooling box through a guide pipe. And a flow control valve is arranged between the third cooling box and the first cooling box. The problems that the upper limit of heat dissipation power is low, the response speed is low, and when heat source power is suddenly increased, enough heat dissipation space is needed to guarantee air convection due to limitation of space layout are solved.

A kind of waste sulfuric acid resourceization rotary evaporation processing device, including rotary evaporator and the hollow rotating shaft being arranged in the rotary evaporator, the hollow rotating shaft is rotated by motor being arranged at one end thereof drive, heat source enters along one end of hollow rotating shaft, is discharged from the other end, multiple annular fins are vertically arranged on hollow rotating shaft, the annular fin includes two cymbal flakes, cymbal flake inner circle is welded to hollow rotating shaft, cymbal flake outer circle top is mutually welded, and forms closed area, multiple baffle plates for changing the flow direction of heat source are arranged in the cavity of the annular fin.The waste sulfuric acid rotary evaporation technology and device of the present application, hollow annular fin is used to heat in the form of thin film to carry out heat exchange, wing piece alternately contacts with dilute sulfuric acid waste liquid and negative pressure steam, when hollow wing piece is immersed in waste sulfuric acid, heat exchange waste liquid and continue stirring, when hollow wing piece is exposed to steam, surface area liquid is evaporated, effectively improve system heat exchange efficiency.

The application provides a hierarchical LNG gasifier structure, which is mainly applied to an LNG organic Rankine cycle power generation process, and is mainly composed of a primary gasifier and a secondary gasifier. According to different states of LNG and organic working medium in the gasifier, the structures of the two-stage gasifiers are designed respectively. The primary gasifier is composed of a shell and an internal sleeve, the inner tube of the internal sleeve adopts a spraying pipeline, and the outer tube of the sleeve adopts a petal-shaped pipeline. The secondary gasifier is composed of a shell and an internal pipeline, and annular fins are uniformly arranged on the inner surface of the shell and the outer surface of the pipeline. The gasifier has the advantages that different heat exchange sides are strengthened according to different heat exchange stages of LNG and organic working medium, the gasification efficiency of the gasifier is improved through the mode, and the gasifier has the characteristics of simple structure and high heat exchange efficiency. The structure of the LNG gasifier improves the heat exchange efficiency and saves the floor area.

The utility model discloses an oil smoke purifier with Beidou positioning, which comprises an oil smoke purifier, the surface of the oil smoke purifier is provided with an access cover, the access cover is internally provided with a shell, the shell is internally provided with a main mainboard, a positioning mainboard and a battery, the battery supplies power to the positioning mainboard, and the main mainboard charges the battery; a cover plate is installed on the shell, the cover plate conducts heat to the main mainboard and the positioning mainboard, an annular fin is installed on the surface of the cover plate, and a fan is installed in the middle of the annular fin; a plurality of ventilation holes are formed in the side surface of the access cover; the oil fume purifier can be positioned through the positioning main board, if the oil fume purifier is stolen, the positioning main board records the moving track of the oil fume purifier, the battery can continuously supply power to the positioning main board, and in a certain time, position information can be continuously provided, the oil fume purifier can be conveniently retrieved, and a thief can be easily found.

This invention relates to an energy pile and its embedding method. The energy pile includes a PHC pipe pile, a high thermal conductivity permeable concrete core cast within the pipe pile, a reinforcing steel cage embedded in the core, and a heat exchange tube. The lower part of the PHC pipe pile has multiple radially extending through holes evenly distributed circumferentially. The reinforcing steel cage is a cylindrical steel mesh arranged coaxially with the PHC pipe pile. The heat exchange tube is fixed inside the steel mesh. The invention also relates to an embedding method using the aforementioned energy pile. In this invention, the high thermal conductivity permeable concrete core is confined within the PHC pipe pile, which plays a primary load-bearing role, preventing the high thermal conductivity permeable concrete from cracking and failing under high load conditions. Simultaneously, the multiple radially extending through holes evenly distributed circumferentially at the lower part of the PHC pipe pile ensure that after embedding, the through holes are below the groundwater level, facilitating direct energy exchange between groundwater and the high thermal conductivity permeable concrete, aluminum annular fins, and heat exchange tube, significantly improving thermal conductivity.

The utility model relates to a safety protective cover for a combustor, which belongs to the technical field of combustors and comprises a protective cover body and a heat dissipation mechanism arranged in the protective cover body, a combustion cylinder of the combustor is mounted in the protective cover body, and plugging mechanisms are arranged between the protective cover body and two ends of the combustion cylinder. By matching with air exhaust of the universal pipe, air blowing heat dissipation can be conducted on the surface of the combustion cylinder, the temperature of the combustion cylinder is reduced, hot air formed after heat exchange can be fed into an air inlet of the combustor through the universal pipe to preheat air entering the combustor, and the combustion efficiency of the combustor is improved; and the annular cooling fins and the concave holes can increase the heat exchange area with air in the protective cover body, so that the heat dissipation efficiency is improved, the cooling time of the combustion cylinder is shortened, and the waiting time for workers to maintain the combustion cylinder is shortened.

This utility model relates to the field of power gateway technology, specifically disclosing a gateway device for the power Internet of Things (IoT). The device includes a rectangular cavity within a base box, with mesh holes on the bottom surface of the cavity. The outer edge of the top surface of the base box is fixedly connected to the outer edge of the bottom surface of the gateway body. A fan is fixed to the bottom of the rectangular cavity. The heat-conducting component includes a heat transfer shell and multiple externally threaded tubes fixed to the bottom surface of the heat transfer shell. The outer peripheral wall of the heat transfer shell has several annular fins arranged vertically. A locking nut is threaded onto the bottom end of each externally threaded tube, and a flared end is fixed to the bottom end of the locking nut. Rectangular slots matching the heat transfer shell are provided on both sides of the center of the top plate of the gateway body, and insertion holes matching the externally threaded tubes are provided on the bottom plate of the gateway body. This design effectively solves the problem of poor heat dissipation in power IoT gateways, and the gateway body is fully enclosed, preventing dust and other debris from entering its internal cavity.

The invention discloses a water-cooling head radiator with a water pump and a radiating device thereof. The water-cooling head radiator comprises a water-cooling head body, an annular fin group and a wind power unit, the water cooling head body comprises a copper bottom plate and a shell part arranged on the copper bottom plate, an upper space and a lower space are arranged in the shell part, a water pump is arranged in the upper space, and the copper bottom plate is arranged in the lower space to be closed and sealed; the annular fin set is provided with an annular heated part and a plurality of heat dissipation fins extending from the annular heated part in the side direction, and the annular heated part is arranged on the shell part in a sleeving mode and located outside the position opposite to the upper space. The wind power unit is arranged on the shell part and corresponds to the upper space, the wind power unit is provided with a frame part, and the frame part extends towards the annular fin group, is provided with a cover part and is arranged outside the annular fin group in a sleeving mode.

The utility model discloses a collector tube finned tube type protective gas cooler, which relates to the technical field of protective gas coolers, and comprises a shell component, a plurality of U-shaped heat exchange elbows are fixedly arranged in the shell component, the U-shaped heat exchange elbows are integrally bent U-shaped finned tubes, annular fins are fixedly arranged on the U-shaped heat exchange elbows, and the annular fins are arranged on the U-shaped heat exchange elbows. A pair of collecting pipes is arranged on the outer side of the shell assembly, the U-shaped heat exchange pipe penetrates through the shell assembly, the U-shaped heat exchange pipe is communicated with the pair of collecting pipes, the U-shaped heat exchange bent pipe is a U-shaped finned pipe which is integrally bent, and the bending of the whole pipe can ensure that no welding point exists in a furnace, so that the leakage danger caused by welding defects is avoided; the pair of headers is arranged on the outer side of the shell assembly, so that the headers can be far away from a heat source, and the phenomenon of scaling in the headers is eradicated.

A heat exchanger includes an outer body defining a centerline axis and a flow passage extending from an inlet to an outlet of the heat exchanger. A first annular fin is disposed within the flow passage, wherein the first annular fin is concentrically aligned with the centerline axis and defines a first undulating surface. A second annular fin is disposed within the flow passage. The second annular fin is concentrically aligned with the centerline axis and defines a second undulating surface. The second annular fin is radially spaced from the first annular fin to define a flow channel therebetween. The flow passage, the first annular fin, and the second annular fin diverge along the centerline axis downstream from the inlet.

The invention discloses a solid fluctuation localization inertial navigation gyroscope capable of inhibiting defects. The solid fluctuation localization inertial navigation gyroscope comprises a gyroscope base, piezoelectric electrodes, a circuit board, a sealing cover, a cylindrical harmonic oscillator, a top cover, a supporting structure and a transmission structure, the cylindrical harmonic oscillator is installed above the circular truncated cone through a supporting structure and a transmission structure. The top cover is arranged at the upper end of the cylindrical harmonic oscillator; the cylindrical harmonic oscillator comprises a resonance ring and a rib ring assembly, the resonance ring is a cylinder, a through hole is formed in the middle of the resonance ring, and internal threads are arranged at the upper end and the lower end of the through hole and used for being detachably connected with the top cover and the transmission structure; the rib ring assembly is of a cylindrical shell structure with a circular groove and is connected to the top of the resonance ring in a sleeving mode through the circular groove, annular ribs are periodically arranged on the outer wall of the rib ring assembly, and the annular ribs are symmetrically distributed from the middle of the resonance ring to the two sides of the resonance ring. The resonance ring on the inner side is used for rotating and vibrating and compensating mass distribution, and the rib ring assembly on the outer side is used for restraining working mode phase deviation and characteristic frequency splitting decomposition caused by mass concentration.