272results about How to "Reduce eddy current" patented technology

The invention discloses a micro-channel jet reactor. The micro-channel jet reactor comprises a sample introduction unit, a main mixing unit and a reaction unit which are sequentially communicated, the main mixing unit comprises a first inner pipe and a first outer pipe arranged outside the first inner pipe in a sleeving manner; a first annular space is formed between the first inner pipe and the first outer pipe; the sample introduction unit is communicated with the first inner pipe; a second sample inlet is formed in the first annular space, and a plurality of through holes are formed in the first inner pipe; the reaction unit comprises a second inner pipe and a second outer pipe arranged outside the second inner pipe in a sleeving manner; a second annular space is formed between the second inner pipe and the second outer pipe; the first inner pipe is communicated with the second inner pipe; during use, condensate is arranged in the second annular space. The reactor can effectively improve the mixing uniformity degree of reaction liquid, meanwhile, the reaction temperature is controlled, and the reaction rate and selectivity are ensured.

The invention relates to the technical field of glycerol triacetate preparation, in particular to an esterification phase splitter for preparing glycerol triacetate, which comprises a tower tray arranged in a rectifying tower, umbrella-shaped covers are uniformly distributed on the upper surface of the tower tray, and the tower tray comprises a movable tray, a fixed tray, a riser and an adjusting mechanism. By optimizing the structure of the umbrella-shaped cover and the design of the adjusting mechanism, the problems of a viscous layer and entrainment caused by high viscosity of glycerol triacetate are solved, by reducing the diameter of the bottom of the umbrella-shaped cover and reducing the comprehensive height of the overflow weir, the liquid flowing space is enlarged, the liquid retention time is shortened, and by forming an air inlet groove and an adjusting hydraulic oil cylinder, the liquid retention time is shortened. The gas-phase flow area is increased, gas-liquid contact is optimized, entrainment is reduced, through adjustment of the hydraulic oil cylinder, adaptation to the requirements of different reaction stages is achieved, the height of the downcomer is increased, and the flooding risk is reduced.

The invention discloses multi-stage wastewater treatment equipment for fabric disinfectant production, and relates to the technical field of wastewater treatment.The multi-stage wastewater treatment equipment for fabric disinfectant production comprises a filtering bin, a shielding cover is detachably and fixedly installed at the top end of the filtering bin, and a water inlet pipe is fixedly communicated with the center of the top of the shielding cover; the auxiliary stirring mechanism comprises a rotating part which is rotationally connected to the center position of the bottom of the inner wall of the filtering bin; the compression of the supporting spring and the compression of the buffer spring are synchronously carried out, when the flow of waste water is reduced or the impact force applied by the flow to the trapezoidal block is changed, the acting force on the supporting spring and the buffer spring is reduced, and the supporting spring and the buffer spring tend to rebound upwards, so that the filter screen is further buffered through the supporting spring and the buffer spring; meanwhile, the filter screen vibrates in the using process, and the situation that the filter screen is blocked by large-particle impurities, and preliminary filtration of the wastewater is affected is avoided.

The invention discloses a ducted fan design method and device based on a similarity criterion, and the method comprises the steps: taking a small ducted fan as a prototype, obtaining basic aerodynamic performance information of the small ducted fan through aerodynamic performance simulation, and obtaining a similarity relation of the aerodynamic performance of the ducted fan through a dimension analysis method in combination with a similarity theory; basic information such as the geometric dimension, the rotating speed and the incoming flow speed of the target large ducted fan is rapidly predicted; then, numerical simulation is conducted on the predicted large ducted fan, the aerodynamic performance of the large ducted fan is further verified, and therefore rapid design and performance prediction of the large ducted fan are achieved. According to the method, the large ducted fan is designed by utilizing the existing mature small ducted fan based on the similarity criterion, so that the scientificity and accuracy of the design are improved, the test and calculation cost is remarkably reduced, and the research and development period is shortened. And meanwhile, the aerodynamic performance and efficiency of the ducted fan can be improved.

The invention discloses a semi-coke tail gas chemical looping hydrogen production system which is characterized in that a first gas inlet chamber and a second gas inlet chamber are arranged in the hydrogen production system, and a reaction tube comprises a first reaction chamber and a second reaction chamber; the gas inlet of the first reaction chamber is communicated with the gas inlet of the second reaction chamber; the air outlet of the first reaction chamber is communicated with the air outlet of the second reaction chamber, so that the first reaction chamber and the second reaction chamber can supply air independently, the air speed in the first air inlet chamber is higher than that in the second reaction chamber, internal airflow circulation is effectively formed in the internal circulating fluidized bed, the reaction process is more sufficient, and the reaction efficiency is improved. The device effectively improves the hydrogen production efficiency, is simple in structure, realizes the independent air supply process through the independent design of the two cavities of the gas inlet pipe and the reaction pipe, realizes the effective circular reaction of tail gas in the reaction pipe through the control of the air speed, and improves the conversion efficiency.

The invention belongs to the technical field of sewage treatment, particularly relates to phase-change deoxidization and deamination equipment and a phase-change deoxidization and deamination method based on sewage treatment, and aims to solve the problems that wastewater is difficult to completely contact with phase-change deoxidization fibers in a wastewater flowing process, so that the deoxidization effect is influenced in deoxidization operation, and the operation and the safety of the equipment are influenced, the following scheme is provided: the phase-change deoxidization and deamination equipment comprises a shell, end shells are arranged at the two ends of the shell correspondingly, purging pipes are fixedly connected to the outer walls of one sides of the two end shells correspondingly, and purging air bins are fixedly connected to one ends of the two purging pipes correspondingly. The phase change deoxidization and deamination equipment and method based on sewage treatment have the effect of improving the sewage treatment effect, and during use, the device can disturb flow of wastewater in the sewage pipe bin, so that the contact effect of the wastewater and the deoxidization fiber body is improved when the wastewater flows; further, the degassing effect of the deoxidizing fiber on gases such as oxygen and ammonia gas in the wastewater is improved, and the using effect of the device is improved.

The utility model relates to a rotor structure for an air suspension centrifugal blower, and belongs to the technical field of rotor structures. The motor rotor comprises a permanent magnet core body, sheaths, pull rods, plugs, thrust discs and shaft heads, the plugs are arranged at the two ends of the permanent magnet core body, the sheaths sleeve the permanent magnet core body and the sheaths, protrusions are arranged at the outer ends of the plugs, and one ends of the two pull rods penetrate through the protrusions of the plugs and are in threaded connection with the plugs; the other end of one pull rod sequentially penetrates through the main impeller, the thrust disc and the shaft head from outside to inside, and the other end of the other pull rod sequentially penetrates through the cooling impeller and the shaft head from outside to inside; the shaft head is arranged outside the protrusion of the plug in a sleeved mode, and a drainage impeller is further arranged between the shaft head close to the main impeller and the plug. By arranging the drainage impeller, airflow is effectively guided, the path of the air channel is optimized, the speed and the flow of the airflow in the heat dissipation air channel are increased, and the overall heat dissipation efficiency of the air blower is enhanced.

The invention discloses a device and a method for laser crystal growth based on a seed crystal reentry method. The device comprises a furnace body and a control system, the lifting mechanism is arranged in the furnace body and is fixedly connected with the top of the furnace body; the lifting mechanism is connected with a seed crystal support, a rotating mechanism is arranged on the seed crystal support, and a torque detection device is arranged on the rotating mechanism; the seed crystal support is used for loading seed crystals; a crucible is arranged under the seed crystal, a plurality of heating units are arranged around the crucible, a rotating magnetic field generator is also arranged around the crucible, and a cooling system is arranged around the rotating magnetic field generator. According to the device and method for laser crystal growth based on the seed crystal reentry method, the eddy current phenomenon in the laser crystal growth process is effectively restrained by accurately controlling the intensity and frequency of the rotating magnetic field and optimizing magnetic field distribution.

The utility model belongs to the technical field of electrolytic baths, and particularly relates to a pure water hydrogen production PEM electrolytic bath structure which comprises an anode plate and a cathode plate, the anode plate is provided with an oxygen outlet and a water inlet, the water inlet is fixedly provided with a first connecting shell and a second connecting shell, the first connecting shell is symmetrically provided with connecting assemblies, and the second connecting shell is fixedly provided with a second connecting shell. A filter screen is arranged on the frame and located on one side of the water inlet. According to the utility model, pure water can be conveniently filtered by the filter screen, tiny impurities in the pure water can be intercepted by the filter screen, water flow containing the impurities is prevented from entering the electrolytic bath, when the filter screen is regularly cleaned, the first connecting shell is detached from the second connecting shell by operating the connecting assembly, and then the frame is pulled to move out of the second connecting shell, so that the filter screen is cleaned; the filter screen is arranged on the filter screen to clean impurities on the filter screen, blockage of the filter screen caused by impurity accumulation is avoided, adverse effects of mechanical impurities possibly contained in pure water on the electrolysis process are avoided by filtering the pure water, and the purity of hydrogen produced by the electrolytic bath is improved.

An iron core, a rotor, a stator, a motor, a suspension system and a vehicle, the iron core comprises a magnetizer and a spacer, the magnetizer comprises a body and a first boss, the first boss is convexly arranged at one end of the body along the axial direction, and the body is provided with an accommodating groove; and the spacer is accommodated in the accommodating groove. According to the invention, the magnetizer is provided with the accommodating groove, the accommodating groove is used for accommodating the spacers, and the spacers are arranged in the magnetizer, so that the iron core is divided into a plurality of parts. When magnetic flux passes through the iron core, the eddy current generated by the changing magnetic flux is limited in the magnetizer and the spacer, so that the eddy current caused by the magnetic flux change can be effectively reduced, the eddy current loss of the iron core is reduced, and the efficiency of the motor can be improved.

The invention provides a method for reducing eddy current loss of an annular magnetic core by opening an air gap, which comprises an annular magnetic core (1) and a thin layer air gap (2), the annular magnetic core (1) is an annular ferrite magnetic core, the thin layer air gap (2) is arranged on the inner ring surface of the annular magnetic core (1), the thin layer air gap (2) is an air ring and surrounds the inner ring of the annular magnetic core (1) for a circle, and the thin layer air gap (2) is arranged on the inner ring surface of the annular magnetic core (1). The inner diameter of the thin-layer air gap (2) is the same as that of the annular magnetic core (1), the width of the thin-layer air gap (2) is smaller than one half of the magnetic core width of the annular magnetic core (1), and the magnetic core is structurally kept complete. According to the invention, a layer of thin-layer air gap surrounding the magnetic core is formed near the inner side surface of the annular magnetic core, so that the circulation path of eddy current is cut off, and the eddy current loss is reduced. Meanwhile, the method does not damage the structure of the annular magnetic core, the structure of the annular magnetic core is kept complete, and due to the fact that the air gap is extremely thin, the influence on the magnetic conductivity of the magnetic core can be ignored.

This invention provides a pump body assembly for a compressor and a compressor. The pump body assembly includes: a first cylinder with a suction channel, comprising a main channel and a branch channel, the axis of the main channel being inclined relative to the axis of the compressor; a connecting channel on a partition member, the axis of the connecting channel being inclined relative to the axis of the compressor; and an intake channel on a second cylinder, the axis of the intake channel being inclined relative to the axis of the compressor. The main channel, the connecting channel, and the intake channel are sequentially connected. The intake end of the main channel is located on the side of the first cylinder and / or on the end face of the first cylinder facing away from the partition member. The intake channel communicates with the chamber of the second cylinder, and the branch channel connects the main channel and the chamber of the first cylinder. The technical solution of this invention solves the problem of high suction resistance in the second cylinder of the compressor in the prior art, which leads to reduced overall energy efficiency.

The utility model discloses a central air conditioning pipeline noise reduction assembly, including central air conditioning ventilation pipeline, the inside of central air conditioning ventilation pipeline is provided with central air conditioning ventilation pipeline, the inside of central air conditioning ventilation pipeline is provided with noise reduction assembly no.

The present application relates to a radial dynamic pressure air bearing, which includes a bearing sleeve and at least one support assembly, the support assembly includes a retaining frame arranged in the bearing sleeve and at least one elastic support arm, a distance is left between the retaining frame and the bearing sleeve, the support arm is arranged between the bearing sleeve and the retaining frame, the support arm is provided with at least two abutting parts for abutting against the inner wall of the bearing sleeve, each abutting part is distributed in a circle around the retaining frame, and a gap is left between the abutting part and the retaining frame so that the abutting part can be deformed. When the dynamic pressure air film is just beginning to form, the support arm is more likely to deform, and when the dynamic pressure air film is gradually formed, the support arm is gradually more difficult to deform, so that the deformation degree of the support arm and the formation degree of the dynamic pressure air film reach a dynamic balance, so that the dynamic pressure air film supports the inner rotor more evenly and stably, and achieves a smaller take-off speed.

The utility model relates to the technical field of transformers, in particular to an iron core clamp assembly and a dry-type transformer. The dry-type transformer comprises an iron core clamping piece assembly, the iron core clamping piece assembly comprises a first clamping piece, a screw rod and a first insulating sleeve, and the first clamping piece is provided with a first assembling hole; the screw rod is inserted into the first assembly hole; the first insulating sleeve is arranged between the screw rod and the hole wall of the first assembly hole. The iron core clamp assembly can reduce the eddy current loss of the dry type transformer.

The invention belongs to the field of air pipes, and particularly relates to a fabricated environment-friendly silencing air pipe which comprises edge strips. A storage cavity is formed in each edge strip, a polyurethane foaming agent is stored in each storage cavity, an injection opening is formed in the bottom end of each storage cavity, the four sets of edge strips are arranged, an outer side plate is arranged between every two sets of edge strips in the longitudinal direction, one side of each outer side plate is attached to the corresponding inner side plate, and the other side of each outer side plate is attached to the corresponding inner side plate. A plurality of sets of exhaust ports are formed in the center position of the side, away from the inner side plate, of the outer side plate, filling noise elimination mechanisms are arranged between the outer side plate and the edge strips and between the inner side plate and the edge strips, and an assembly type noise elimination mechanism is arranged between every two transverse sets of edge strips; the filling noise elimination mechanism is used for suppressing noise generated when the air flow impacts the inner side plate; through the structural design of the combination of the filling noise elimination mechanism and the assembly type noise elimination mechanism, the function of suppressing wind noise from multiple directions is achieved.

A steam buffer tank with stable flow velocity comprises a tank body, an adjusting structure and a moving structure, and relates to the technical field of steam tanks for boron-10 acid production, a gas inlet pipe is arranged at the left end of the tank body, a temperature and pressure integrated sensor is installed in the middle of the upper end of the tank body, and a pressure release valve is arranged at the upper end of the tank body and located on the right side of the temperature and pressure integrated sensor; according to the device, vortex and turbulent flow generated during steam flowing are reduced through the arrangement of the multiple buffer plates distributed in a staggered mode, the steam flowing speed is more uniform and stable, and the function of stabilizing the steam flowing speed is achieved; when the tank body is placed on the inclined ground for use, the leveling treatment on the tank body is realized through the arrangement of the adjusting structure, so that the steam tank body is prevented from toppling over due to inclination; when the tank body needs to be moved or the position of the tank body needs to be adjusted, the device controls the moving wheels to move downwards through the first motor, so that the moving wheels are attached to the ground, the fixing base is gradually lifted from the ground, and workers can conveniently move the tank body through the moving wheels.

The invention relates to the technical field of flue gas treatment, in particular to a tail gas soot trapping filter which comprises a cage type frame and a metal filter bag, a gas outlet and a gas inlet are formed in the cage type frame, and the metal filter bag is detachably arranged in the cage type frame; a plurality of vent holes are formed in the metal filter bag, the vent holes are filled with metal powder, and flocculent filter holes are formed by the metal powder and the vent holes in a high-temperature sintering mode; one end of the filter hole is communicated with the air outlet, and the other end of the filter hole is communicated with the air inlet; according to the tail gas soot collecting filter, the metal filter bag is arranged to filter tail gas of a diesel engine, so that the resistance of an air channel is small, the air channel is not prone to being blocked in the filtering process, the exhaust back pressure of the engine is not prone to being increased, and normal operation of the engine is facilitated.

The utility model relates to a piston type energy accumulator which is provided with an energy accumulator shell (10), a separating piston (12) can be guided in the energy accumulator shell in a longitudinal displacement mode, two fluid cavities are separated by the separating piston, and the separating piston is provided with a damping piston (18) with a check valve (20). The damping piston (18) can be moved into a fluid connection (24) in the energy accumulator housing (10) while forming a throttle gap (22) which is a cylindrical annular space formed by adjacent walls (28, 32) of the energy accumulator housing (10) and of the damping piston (18), and the check valve (20) has a valve ball (36) which is loaded by the energy accumulator, the valve ball blocks a fluid path between the fluid connection (24) and a piston fluid chamber (38) between the separating piston (12) and the accumulator housing (10) in the closed position thereof and releases the fluid path in the open position thereof.

The utility model discloses a right-angle joint which comprises an elbow joint and an upper connecting pipe, an upper connecting port is arranged on the left side of the elbow joint, a lower connecting port is arranged at the bottom end of the elbow joint, the elbow joint is connected with the upper connecting pipe through the upper connecting port, and the elbow joint is connected with the lower connecting pipe through the lower connecting port. The right-angle connector is provided with the flow stabilizing blocks and the flow guiding grooves, the flow stabilizing blocks increase the thickness of the pipe wall at the fluid turning position, so that turbulent flow and vortex are reduced, the speed of fluid is reduced through the two sets of slopes, it can be ensured that the fluid stably passes through without generating violent vibration or pressure fluctuation, abrasion to the turning position of the inner wall of the elbow connector is reduced, and breakage is avoided; the sawtooth-shaped texture structures formed on the surfaces of the flow stabilizing blocks and the flow guide grooves can disperse fluid into a plurality of small flow channels, the kinetic energy of the fluid is effectively dispersed, vibration and noise in a pipeline system are reduced, and the problem that the stability of fluid passing is poor is solved.

The utility model discloses a hovercraft fan device with a pre-dust-fall function, which comprises a fan shell, a dust-fall spraying ring seat is detachably and fixedly connected to the front end part of the fan shell, and a dust-fall atomizing nozzle is fixedly connected to the inner side part of the dust-fall spraying ring seat corresponding to the circumference of the dust-fall spraying ring seat; a water supply pipe is communicated with the dust-falling atomizing nozzle through the dust-falling spraying ring seat, and a water supply pump is communicated with the water supply pipe; a first fan blade set and a second fan blade set are sequentially assembled in the fan shell, and the first fan blade set and the second fan blade set are coaxially arranged in a propeller reversing mode. The technical problems that in the prior art, dust is prone to being accumulated during operation of a fan for a hovercraft, so that the propelling efficiency and the function stability of the fan are reduced, the overall maintenance cost is increased, and the application economical efficiency is poor are solved.

The utility model provides a kind of hanging air purifier, relate to air purifier technical field.A kind of hanging air purifier, comprising: shell, air inlet and air outlet are provided on shell;Support frame, support frame is set in shell, and first accommodating space is provided in support frame;Filter element, filter element is set in first accommodating space;Plasma generating device, plasma generating device is set in first accommodating space, and filter element is set between plasma generating device and air inlet;Wherein, plasma generating device includes first frame and multiple plasma generating modules set in first frame.By being provided with plasma generating device in hanging air purifier, air is further treated by sterilization, deodorization etc. after passing through physical filtration, improve purification efficiency, and plasma generating device uses modular design to use multiple plasma generating modules, facilitate flexible configuration.

The utility model relates to a vehicle-mounted electronic device and a vehicle, and the vehicle-mounted electronic device comprises a housing which is provided with a heat dissipation surface; the axial flow fan is arranged above the heat dissipation surface and blows air towards the heat dissipation surface; the shielding device is arranged on the side, close to the heat dissipation face, of the axial flow fan and completely covers a non-air-blowing area in the center of the axial flow fan. The heat dissipation surface of the shell is subjected to air blowing heat dissipation through the axial flow fan, the shielding device shields the non-air-blowing area in the center of the axial flow fan, air circulates towards the outer side along the outer wall of the shielding device, generation of vortexes in the non-air-blowing area in the middle of the axial flow fan is reduced, and therefore the energy loss of the axial flow fan is reduced, and the heat dissipation effect is enhanced; and meanwhile, noise generated by turbulence of the air flow is also reduced due to reduction of the vortex.

This invention discloses an eccentric sleeve and a scroll compressor. The eccentric sleeve includes a shaft portion and an edge portion. The edge portion includes a front end edge and a rear end edge disposed radially on the shaft portion. The edge portion is formed by the front end edge extending around the edge of the shaft portion towards the rear end edge. The front end edge and / or the rear end edge are at least partially tangential. By implementing this invention, the front end edge and rear end edge are designed with tangential structures. When the eccentric sleeve rotates, the tangential structures of the front end edge and rear end edge cause them to be tangential to the refrigerant oil. The small contact area between the front end edge and the refrigerant oil greatly reduces the agitation of the refrigerant oil, reduces the generation of eddies, lowers the compressor's power consumption, and thus improves the compressor's energy efficiency.

The utility model relates to an auxiliary assembling device for a gradient coil assembly. The auxiliary assembling device comprises rotating equipment and alignment equipment. The rotating device is used for installing a main coil and a shielding coil of the gradient coil assembly and can drive the main coil and the shielding coil to rotate around the rotating axis of the rotating device. The alignment equipment and the rotating equipment are arranged at intervals and can move relative to the rotating equipment; the alignment device is used for emitting alignment light beams so that the main coil and the shielding coil can receive the alignment light beams. When the gradient coil assembly of the medical magnetic resonance equipment is installed through the device, firstly, the main coil is installed on the rotating equipment, the alignment equipment moves to a preset position and emits an alignment light beam, and the rotating equipment drives the main coil to rotate so that the main coil can receive the alignment light beam; a user adjusts the position of the main coil according to the position of the alignment light beam, and then adjusts the position of the shielding coil in the same way, so that the mounting positions of the main coil and the shielding coil are more accurate.

The invention discloses a marine empennage, which relates to the technical field of ships, and comprises a ship shell of a wave-shaped flat bottom structure, and the upper end of the ship shell is fixedly connected with a deck used for covering the space in a ship and horizontally dividing the space into layers; the side, close to a deck, of the hull is fixedly connected with a cabin used for storing materials and allowing sailors to work and live, the outer wall of the side, away from the cabin, of the hull is fixedly connected with an empennage plate body used for keeping course stability and providing rotation or trim adjusting capacity, and dynamic wingspan expansion mechanisms are arranged on the two sides of the upper end of the empennage plate body. An arc wing guide swing mechanism is arranged at the center of the upper end of the empennage plate body, a trapping screen wing mechanism is arranged on one side of the tail end of the empennage plate body, plate wings and an electric telescopic rod are matched with each other, and the stress area of the empennage can be increased by improving the sailing performance and expanding the wingspan; therefore, larger lift force is generated under the condition of the same wind speed or water flow.

The invention relates to the technical field of fluid conveying pipelines, and discloses a bundled metal hose which comprises a bundled metal hose body, connector assemblies are installed at the two ends of the bundled metal hose body respectively, a plurality of small-diameter thin-wall stainless steel wire pipes are selected as basic units of the bundled metal hose body, and the outer diameter phi of each stainless steel wire pipe is smaller than 5 mm. The wall thickness is 0.1-0.2 mm, the bundling metal hose is made of one of 304 stainless steel and 316 stainless steel, a first welding spot and a second welding spot are arranged at the two ends of the bundling metal hose respectively, and the two ends of the bundling metal hose are welded to the two connector assemblies through the first welding spot and the second welding spot respectively. A plurality of small-diameter thin-wall stainless steel wire pipes are bundled to form the hose main body, so that the inherent defects of a traditional corrugated metal hose are fundamentally overcome; firstly, fluid pressure is uniformly dispersed to each independent wire tube through the bundling structure, the stress concentration phenomenon of a traditional corrugated structure is avoided, and the overall compression strength and anti-fatigue performance are remarkably improved.

The utility model provides a deep well multistage centrifugal water pump, and belongs to the technical field of deep well water pumps. The deep well multistage pump solves the problem that in the prior art, power loss of a deep well multistage pump is too large. The multi-stage centrifugal pump comprises a water inlet seat, a sealing ring, a pump shell, a water outlet seat, a pump shaft and a multi-stage impeller assembly, the water inlet seat, the sealing ring, the pump shell and the water outlet seat are fixedly connected in sequence, the pump shaft sequentially penetrates through the water inlet seat, the multi-stage impeller assembly and the water outlet seat, and the multi-stage impeller assembly is installed in the pump shell. The multi-stage impeller assembly comprises a front guide vane, a plurality of impeller bodies, a plurality of fluid directors and a rear cover plate, each fluid director is of an annular structure as a whole, a through hole is formed in the center of each fluid director, a supporting face is formed in each fluid director and is in a high-low shape, and a circulation hole is formed in the side end face in each supporting face; a first worm-shaped flow guide channel and a second worm-shaped flow guide channel are formed in the front side and the rear side of the supporting face respectively, the supporting face is close to the front side of the flow guider, and a containing cavity is formed in the rear side of the supporting face. The utility model has the advantage of less power loss.

The utility model discloses a device for additionally installing a jet device on a smoke exhaust pipeline of an oil station, which relates to the technical field of smoke exhaust of the oil station and comprises an oil tank and a smoke exhaust pipe, an oil tank smoke exhaust fan is arranged on the smoke exhaust pipe, and a nitrogen jet device control device is further arranged in the smoke exhaust pipe. The nitrogen jet device control device comprises a stainless steel pipe, a reducer pipe joint, an elbow and a welding type regulating valve. The nitrogen jet device can form negative pressure in a pipeline by jetting nitrogen at a high speed, so that oil smoke and harmful gas in the pipeline can be sucked and exhausted more effectively, the smoke exhaust effect is improved, flow field distribution in the pipeline can be improved through the jetting effect of the nitrogen jet device, vortexes and dead angles are reduced, and the smoke exhaust effect is improved. Oil smoke and harmful gas are discharged more smoothly, the possibility of pipeline blockage is reduced, nitrogen ejected by the nitrogen ejector can exchange heat with high-temperature discharged smoke, and therefore the temperature of the discharged smoke is reduced, the heat load on pipeline materials is reduced, and the service life of the pipeline is prolonged.