60results about How to "Significant practical value" patented technology

The invention relates to a bridge deck structure of a steel bridge, in particular to a steel and ultra-high performance concrete combined bridge deck structure, comprising a steel bridge deck, an ultra-high performance concrete layer is coated above the steel bridge deck, a bridge deck pavement layer is coated above the ultra-high performance concrete layer, and the ultra-high performance concrete layer is internally provided with reinforced bars. The steel and ultra-high performance concrete combined bridge deck structure has the advantages of small construction height, large stiffness, good binding performance between combined layers, good durability, good fatigue resistance, little vehicle impact and the like.

The invention discloses a steel-fiber concrete combined bridge deck structure with reinforced joints. The steel-fiber concrete combined bridge deck structure is mainly formed by assembling a plurality of steel plate-fiber concrete combined components, each component comprises a steel bridge deck plate and a prefabricated fiber concrete element cast on the steel bridge deck plate, reinforced joint structures are arranged in butt joint regions of two adjacent components and comprise cast-in-situ concrete elements and steel plate reinforcing components, the steel plate reinforcing components are covered by prefabricated fiber concrete elements and cast-in-situ fiber concrete elements, the steel plate reinforcing components and the prefabricated concrete elements are connected in a tongue-and-groove engaging mode for forming an integral fiber concrete layer, and the adjacent steel bridge deck plates are welded into an integral steel bridge deck plate layer. A construction method provided by the invention comprises the following steps that the steel-fiber concrete combined components are firstly manufactured, then, the combination and split joint is carried out, and next, the repeated sequential assembly is carried out. The steel-fiber concrete combined bridge deck structure and the construction method have the advantages that the tensile strength and the rigidity of local parts of the combined bridge deck structure can be improved, the joint seam stress is reduced, and the generation of cracks of paving layers is prevented.

A portable put-on glove keyboard method, which uses fingers to contact pressure sensor devices near various points at a glove body and readily input text and number data, includes a glove body, a finger keyboard sensor array module, a transmission module, a power module and a system control module. The invention is characterized that, by contacting numerous points that can naturally come into contact with one another on the glove, the invention provides a novel method for replacing conventional keyboard input methods.

The invention discloses a fabricated fibrous concrete combined deck structure and a construction method thereof. The combined deck structure comprises a steel bridge deck layer, wherein a fabricated fibrous concrete layer covers the upper surface of the steel bridge deck layer; the main body of the fabricated fibrous concrete layer is a cast-in-situ fibrous concrete layer; a plurality of prefabricated fibrous concrete plates are in embedded connection with the cast-in-situ fibrous concrete layer; tongue-and-groove joints articulated with the cast-in-situ fibrous concrete layer are arranged at the periphery of each prefabricated fibrous concrete plate; and the fabricated fibrous concrete layer is equipped with steel bars. The construction method comprises the following steps: the steel bridge deck layer is manufactured at first, and then the prefabricated fibrous concrete plates are manufactured and laid, or steel bridge deck blocks are prefabricated at first, and steel beams are erected and assembled; after that, the construction of the cast-in-situ fibrous concrete layer and the surface treatment are carried out in sequence; and the construction is completed finally. The combined deck structure disclosed by the invention can improve the tensile strength limit of concrete slabs and effectively prevent a pavement layer from cracks, and has good service durability, good fatigue resistance; and the construction process is simple and efficient.

The invention discloses a method for preparing a hydrophilic polytetrafluoroethylene hollow fiber film. The method comprises: mixing polytetrafluoroethylene dispersed resin powder, extrusion aid and silica sol, compacting them, forming polytetrafluoroethylene hollow tubes by extruding blanks through an extruder, carrying out vertical stretching and thermoforming by sintering in a baking oven, and then obtaining the hydrophilic polytetrafluoroethylene hollow fiber film by a grafting reaction. An average aperture of the outer layer of the hydrophilic polytetrafluoroethylene hollow fiber film is 0.10-1.0mum, an average aperture of the internal layer is 5.0-20mum, the wall thickness is 0.1-0.5mm, and the water filtrating speed is 0.1-3m<3> / m<2>*h(filtrating pressure is 0.01-0.2MPa). The method is mainly used in a microfiltration separating process, and can be used in the fields of industrial waste water treatment, production material liquid pretreatment and seawater desalination pretreatment.

The invention relates to a boride hardfacing flux-cored wire and a preparation method thereof. According to the technical scheme, a flux core firstly is dried and evenly mixed and then is placed in skin and pulled to obtain the boride hardfacing flux-cored wire. The flux core comprises 1-10 wt% of B, 25-75wt% of Mo, 1-12 wt% of Ni, 1-20 wt% of Cr, 0.2-2 wt% of C, and the balance Fe. The skin is common soft steel or stainless steel. The boride hardfacing flux-cored wire is low in cost, and after a parent metal is subjected to overlaying processing through the prepared boride hardfacing flux-cored wire, a cladding layer on the surface of the parent metal can be good in corrosion resistance, excellent in wear resistance, and high in hardness.

The present invention relates to the process of preparing boron nitride nanotube, and relates to inorganic nanometer material. Non-toxic boron compound, such as boron chloride, boric acid, etc. as material is first ball ground for certain time, and then heated to over 800 deg.c in flowing ammonia or nitrogen and maintained for over 0.5 hr. The product after being cooled is cleaned in dilute hydrochloric acid, distilled water and alcohol and dried to obtain white powder as the boron nitride nanotube product. The process is simple, mild in condition and suitable for mass production, and has yield over 80 %. The prepared boron nitride nanotube is semiconductor and may be used in nanometer electronic device, nanometer structural ceramic material, hydrogen storing material, etc.

The invention provides an oil injection timing control system aiming at a double-swirl combustion system and a control policy thereof. The invention has the advantages that fuel jets under different working conditions and a double-swirl combustion chamber 2 are matched and optimized by using a modern precise control technology, and an oil injection advance angle is exactly controlled; under an idle speed and a small load, an injection starting point is a function of the oil injection quantity and the rotating speed of the diesel engine and is obtained through a demarcated pulse spectrum, and under a large load, the injection starting point is commonly decided by the rotate speed of an engine, in-cylinder pressure and injection pressure; at the moment, a fuel oil bundle passes through an arc ridge, and is split into two parts and distributed to an inner chamber and an outer chamber in a best proportion; double swirls are formed so as to more quickly form uniform combustible mixing gas and ensure that combustion is quick and perfect without large inlet vortex flows; and the economical and dynamic indexes of the engine are improved, and the discharge of harmful pollutants can be reduced.

The invention relates to an image amplification processing method based on the edge direction difference. The processing method comprises the following steps of: amplifying an original image for k times, scanning the original image by forward scanning, and determining projection coordinates of four top points on a second-dimensional plane, wherein the four top points are not on the same plane and used for structuring the plane; judging the degree of the absolute difference of pixel diagonal lines of four top points; ensuring that the direction with lesser absolute difference of the diagonal line belongs to the edge direction, using the direction with greater absolute difference of the diagonal line as a border line, structuring a plane respectively; calculating the color value of the pixel to be plugged according to the formula and filling. According to the image amplification processing method based on the edge direction difference provided by the invention, the problem of sawtooth or fuzzy phenomenon appeared at the edge after amplifying the image or low operation efficiency is solved; when the image is amplified, the processing method is quick in speed and good in quality and has significant practical value.

The invention discloses a fabricated combined bridge deck structure provided with a grid type connector and a construction method thereof. The combined bridge deck structure is formed by assembling at least two steel plate-fiber concrete combined type components. Each steel plate-fiber concrete combined type component comprises a steel bridge deck slab located on the lower portion and prefabricated fiber concrete pieces poured on the steel bridge deck slab. One grid type connector is arranged in the butt joint area of every two adjacent steel plate-fiber concrete combined type components. The grid type connector comprises cast-in-place fiber concrete pieces and grid reinforcement components fixedly connected to the corresponding steel bridge deck. The grid reinforcement components is completely covered with the prefabricated fiber concrete pieces located on the two sides of the butt joint area and the cast-in-place fiber concrete pieces located in the butt joint area. The prefabricated fiber concrete pieces and the cast-in-place fiber concrete pieces are connected through the grid reinforcement components, so that an integrated fiber concrete layer is formed. The two adjacent steel bridge deck slabs are fixedly connected to form an integrated steel bridge deck slab layer.

The invention relates to a real-time image infusion method and a corresponding real-time image infusion device. The method includes the following steps that first, data A1 and A2 of registered images to be fused are input; second, the A1 and the A2 are preprocessed through normalization to obtain I1 and I2; third, a weight plot w1 and a weight plot w2 are solved when the I1 and the I2 are fused; fourth, the threshold vale T1 and the threshold value T2 are calculated when the I1 and the I2 are infused in a segmented mode; fifth, the I1 segment and the I2 segment are infused according to the obtained threshold value T1 and the obtained threshold value T2 in segmented fusion; sixth, the infusion result is output. With the technology, the quality of the fused image can be fast improved, and meanwhile the real time requirement in engineering application can be met.

The present invention provides an input device which enables a user to input desired information by simple operations even though a user has pressed a wrong button, as well as to make an information inputting position stationary.The input device in the present invention includes: a rotor; a section specifying unit specifying a section; a rotation amount detecting unit detecting a rotation amount from the specified section; a section corresponding information holding unit which holds correspondence relationship between each of the sections and a unit of information corresponding to each of the sections; an information group holding unit which holds, as a first information group, each of units of information associated with the corresponding section; an information specifying unit specifying a unit of information corresponding to the specified section based on the held correspondence relationship between the section and the unit of information; and an information selecting unit selecting, out of the held first information group, a predetermined unit of information according to the rotation amount with respect to the specified unit of information as a reference point.

The invention relates to the field of bridge pier reinforcing, in particular to a method for reinforcing a post-earthquake bridge pier through super-toughening fiber concrete. The damaged bridge pieris supported, failure concrete is chiseled away, a bearing platform face is roughened, and anchoring steel bars and original steel bars are welded; the original steel bars are welded, the anchoring steel bars in the super-toughening fiber concrete are laid, and the anchoring steel bars are welded to the original steel bars; a formwork is mounted, the super-toughening fiber concrete is poured, andafter completion, a vibration platform is adopted for vibration compaction; and the poured super-toughening fiber concrete is cured, after the mechanical index of the concrete meets the design requirement, the formwork is removed, and whole construction is completed. Owing to the fact that the post-earthquake bridge pier is reinforced through the super-toughening fiber concrete, the method has thecharacteristics of being small in thickness of the reinforced structure, large in rigidity, high in toughness, good in interlayer cohesiveness, good in durability and good in fatigue resistance.

The invention provides a method for extracting fiber used for papermaking from vinasse. The method comprises the following steps: 1) extracting a preliminary vinasse fiber extract from the vinasse; and 2) subjecting the preliminary vinasse fiber extract to modifying treatment so as to obtain the fiber used for papermaking. The preliminary vinasse fiber extract is prepared through the following preparation process: mixing the vinasse with water; under the condition of full stirring, selecting a 6-to-20-mesh sieve, and subjecting the vinasse to filtering treatment so as to the upper-layer preliminary vinasse fiber extract; and centrifuging a lower-layer filtrate so as to obtain a supernatant. According to the invention, after the preliminary vinasse fiber extract and the supernatant are mixed and ground, an obtained mixture is added into a reaction vesssel; a dispersant and a deep eutectic fluxing agent are then added into the reaction vessel; after a reaction under heating and stirringis performed, sieving is performed with a press-filtering curved sieve; thus, a vinasse extract is obtained; moreover, the vinasse extract is mixed with a conventional paper raw material to prepare apapermaking pulp which is conveyed into a papermaking machine for papermaking to form composite paper. The method provided by the invention provides a novel raw material for the papermaking industry,and has great practical value for cyclic utilization of vinasse resources.

The invention discloses a device and method for testing sleeve connecting structure grouting compactness in the hammering pre-pressing mode, and belongs to the field of testing methods and equipment.The bottom periphery of an outer steel structure pre-stressing member is fixed on a wall body of a steel sleeve connecting structure to be detected; a cover body of the outer steel structure pre-stressing member is provided with a through hole, and a nut is fixed at the position of the through hole. A force transmitting rod is a rigid rod body, and the middle portion of the rod body is externallytapped. The force transmitting rod penetrates the through hole in the cover body to be screwed into the nut, and threads on the rod body and the nut are in thread fit for driving the force transmitting rod to move up and down. The bottom of the force transmitting rod is closely supported on a grouting body of the steel sleeve connecting structure to be detected. A dynamic signal collecting sensoris attached to the force transmitting rod. A force measuring hammer is used for knocking the end of the force transmitting rod. The device is utilized to achieve the quality inspection of field connection of assembled structural steel sleeves and complete the quantitative analysis of the grouting density in the sleeve.

The invention discloses a steel-Concrete composite bridge structure and composite bridge deck. This steel-concrete composite bridge structure comprises a composite bridge deck and a supporting beam structure supporting the connecting bridge deck. The composite bridge deck comprises a corrugated steel top plate, a reinforcing bar structure arranged on the upper part of the corrugated steel top plate and a concrete structure poured on the corrugated steel top plate and the reinforcing bar structure and connected with the corrugated steel top plate through a connecting piece. The concrete composite bridge deck comprises a corrugated steel top plate, a reinforcing bar structure arranged on the corrugated steel top plate and the corrugated steel top plate. limit bending resistance is obviouslyimproved, the cost is reduced and the dead weight is reduced at the same time.

The invention discloses early embryo diapause villus tissue miRNAs biomarkers related to early embryo diapause degree,which includes hsa-miR-136-5p,hsa-miR-1301-3p,hsa-miR-135b-5p,hsa-141-3p,hsa-miR-19b-3p and hsa-iR-486-5p. Accordingly,the inventor also designs the corresponding reverse transcription or real-time fluorescent PCR primers aiming at the miRNAs biomarkers. The biomarkers can be usedas biomarkers of a fluff sample for detecting early embryo diapause,or used for preparing a diagnostic reagent or a biochip and the like,and has important potential value and application prospect on the diagnosis and treatment of early embryo diapause,can provide a theoretical basis for the later diagnosis of early embryo diapause from the molecular level and research of tissue and serum miRNAs,and has important theoretical significance and potential practical value.

The invention discloses a method for detecting Zika virus by using an RPA technology and a special complete set of reagent for the method. The complete set of reagent consists of a primer pair X and aprobe X. The primer pair X consists of a primer F as shown in a sequence 3 in a sequence table and a primer R as shown in a sequence 2 in the sequence table. The probe X comprises a DNA fragment A, tetrahydrofuran and a DNA fragment B in sequence from 5' to 3'. The DNA fragment A and the DNA fragment B are respectively single-stranded DNA molecules as shown in a sequence 4 and a sequence 5 in thesequence table. Experiments prove that the complete set of reagent provided by the invention can detect Zika virus by performing RPA, and has good specificity and high sensitivity. The reagent has great practical value.

The invention discloses a checking method of CYP2C19 gene sixth extron mononucleotide polymorphism and nucleic acid primer of a separating nucleic acid and an allele specificity, which is characterized by the following: assuring 905 site nucleic acid in SEQ ID NO: 1 sequence of human CYP2C19 gene sixth extron; checking mononucleotide polymorphism; possessing a separating nucleic acid, sequence in SEQ ID NO: 1 and 905 site as G; possessing a nucleic acid primer of allele gene specificity with length at 15-50bp; proceeding special cross; augmenting; getting 905 site mononucleotide polymorphism in SEQ ID NO: 1 with human CYP2C19 gene sixth extron.

The present invention provides an image encoding method and an image decoding method which can, during decoding, restore a sense of high-definition to an area of an input image originally having a high-definition component that was lost during encoding. An additional information generation unit 102 of an image encoding apparatus determines a position where the high-definition component is restored to, and includes: a superposed position determination unit 201 which outputs position information PS indicating a determined position; a superposed component determination unit 202 which determines a high-definition component to restore and outputs high-definition component information OC indicating the determined high-definition component; a superposed parameter determination unit 203 which outputs a parameter OP for superposing the high-definition component; and a bitstream generation unit 204 which performs variable-length coding, as necessary, on the position information PS, high-definition component information OC, and parameter OP, and outputs this as additional information AI.

The invention relates to preparation methods and applications of a chiral spirophosphine-nitrogen-phosphine tridentate ligand SpiroPNP and an iridium catalyst Ir-SpiroPNP thereof. The chiral spirophosphine-nitrogen-phosphine tridentate ligand is a compound represented by a formula I, or a racemate or an optical isomer thereof, or a catalytically acceptable salt thereof, and is mainly structurallycharacterized by having a chiral spiro indane skeleton and a phosphine ligand with a large steric hindrance substituent. The chiral spirophosphine-nitrogen-phosphine tridentate ligand can be synthesized by taking a 7-diaryl / alkylphosphino-7'-amino-1,1'-spiro indane compound with a spiro skeleton as a chiral starting raw material. The iridium catalyst of the chiral spirophosphine-nitrogen-phosphinetridentate ligand is a compound represented by a formula II which is described in the specification, or a raceme or an optical isomer, or a catalytically acceptable salt thereof, can be used for catalyzing asymmetric catalytic hydrogenation reaction of carbonyl compounds, particularly shows high yield (greater than 99%) and enantioselectivity (as high as 99.8% ee) in asymmetric hydrogenation reaction of simple dialkyl ketone, and has practical value.

The invention discloses a solid-web arch bridge system spliced by UHPC prefabricated corrugated plate sections and a construction method. The arch bridge system comprises a strip-shaped concrete foundation arranged on foundation soil, two arch seats provided with reinforced ultra-high performance concrete (RUHPC) tie bars, segment assembled UHPC corrugated plate arch rings arranged on the arch seats, side wall foundations, side walls built by concrete precast blocks, arch filler and concrete side wall coping. The UHPC corrugated plate arch ring is prefabricated in a segmented mode through UHPC, and all the prefabricated segments are spliced into a whole through finish rolling twisted steel and epoxy resin mortar. The UHPC corrugated plate main arch ring is firstly pre-assembled, hoisting construction is adopted after pre-assembly is qualified, and after the main arch ring is hoisted in place, main arch ring folding and on-arch building construction are conducted on the full framing. The prefabricated RUHPC tie bars and the strip-shaped concrete foundation are adopted, the arch foot thrust can be balanced, the work amount of the lower structure can be remarkably reduced, the damage of excavation to the environment is reduced, and the adaptability to the fragile ecological environment area is enhanced.

The invention relates to an aircraft engine installation intersection position deviation processing method. The method comprises the steps that deviation information between the design of the axis ofan engine thrust pin installation hole and the actual situation is determined; determining an engine thrust pin structure according to the deviation information, and establishing a detail finite element model of the engine thrust pin structure; applying a load and a boundary condition in the detail finite element model to obtain a static result of the engine thrust pin; determining a fatigue weakpart of the engine thrust pin according to the static force result, determining a stress concentration coefficient of the weak part, and determining whether the engine thrust pin meets the fatigue strength requirement or not according to the stress concentration coefficient and a stress-life curve of the engine thrust pin. The engine installation intersection position deviation processing method can safely and reliably solve the progress problem during aircraft production and assembly, saves huge economic cost for replacing aircraft frame sections and engine parts, and has great practical value.

A new method for preparing boron nitride nanotubes involves inorganic nanomaterials. Boron oxide, boric acid and other boron-containing and non-toxic boron compounds are used as raw materials, first ball milled for a certain period of time, then heated to above 800°C under flowing ammonia or nitrogen, and kept for more than 0.5h. After cooling, take it out, wash the sample with dilute hydrochloric acid, distilled water and ethanol, and then dry it to obtain a white powder that is boron nitride nanotube. This method has simple process, mild conditions and easy mass production. The yield reaches more than 80%. The prepared boron nitride nanotubes are semiconductors, and can be used in nanoelectronic devices, nanostructure ceramic materials, hydrogen storage and coating layers for preventing oxidation, propellant additives and composite flame retardancy, and have good application prospects.

The invention discloses a rapid detection method for waste oil, belonging to the analysis technical field. The method comprises the steps of: 1)preparation of a sodium ion standard solution; 2) preparation of a cesium nitrate solution (1%); 3) preparation of a hydrochloric acid solution (2%); 4) drawing of a working curve; 5) sample measurement and calculation. By using 1[mu]g / L as a sodium ion concentration standard, whether a tested oil sample is waste oil or mixed with waste oil can be quickly and efficiently determined. The method of the present invention requires simple equipment, is environment friendly, and simple and easy to control, provides further convenience for application in the edible oil quality inspection technical field, and is of great practical value.

The invention discloses a super hydrophobic polytetrafluoroethylene hollow fiber membrane preparation method. The method comprises the steps of mixing polytetrafluoroethylene dispersion resin powder with an extruding-aid agent, pressing a blank, extruding the blank into a polytetrafluoroethylene hollow tube through an extruder, then processing modification to the polytetrafluoroethylene hollow tube through silica sol, and then performing vertical stretching, sintering and heat setting in a baking oven, finally performing penetration processing by using perfluorosilane to obtain the super hydrophobic polytetrafluoroethylene hollow fiber membrane. The processed super hydrophobic polytetrafluoroethylene hollow fiber membrane has an average aperture on external layer of between 0.10-1.0 micrometer and an average aperture on internal layer of between 5.0-20 micrometer, and a surface water contact angle of 152-160 degree. The membrane is mainly used in membrane distillation and separation process, and can be used for seawater desalination, industrial waste water processing and in foodstuff and biological product cryoconcentration.

The invention discloses a cable insulation degradation type discrimination method and system based on a fuzzy evaluation method, and the method comprises the following steps: obtaining the complex polarizability x* of a to-be-tested cable through an FDS test, wherein the complex polarizability x* comprises a real part x and an imaginary part x; by a parameter extraction method of an improved H-N model, obtaining polarization xre, direct current conductance dc and jump conductance Delta according to the obtained complex polarizability x*; and judging the insulation degradation type of the cableto be tested based on a fuzzy evaluation method according to the obtained polarization re, direct current conductance dc and jump conductance Delta. According to the cable insulation degradation typediscrimination method, accurate identification of the degradation type of the XLPE cable can be realized.

The invention discloses a method and a device of automatically monitoring suspended load sediment by a replacement method. The device includes an overwater portion and an underwater portion. The underwater portion includes a lead fish and a cable. A submersible pump is mounted on the cable above the lead fish. A water inlet of the submersible pump is parallel to a main line of the lead fish. An upper water pipe of the submersible pump protrudes from a water surface and is provided with a solenoid valve. The overwater portion includes a water container. The water container is placed on a weighing sensor through a support frame. An overflow water pipe is arranged at an upper end of the water container. An upper end of the overflow water pipe opens into an overflow drainage pipe. A drainage pipe is arranged at a lower end of the water container. A solenoid valve is arranged on the drainage pipe. A first temperature sensor is mounted at the same height as the submersible pump. A second temperature sensor is mounted at the overflow drainage pipe. According to the device, automation of observing of suspended load sediment of rivers can be realized, manual intervention and errors caused by manual intervention are greatly reduced, work efficiency can be improved by dozens of times, and energy consumption is greatly reduced.

The invention belongs to the technical field of computer application and virtual reality, and particularly relates to a method for displaying a dynamic motion, in the air, of a virtual refueling hose. Display objects include a refueling hose short cabin (called a short cabin for short), a short cabin datum origin (called an origin for short), a refueling hose and a conical refueling nozzle (called a refueling nozzle for short); the refueling hose consists of N sections of pipe bodies; and the front end of the first section of the pipe body is connected with the origin, and the back end of the first section of the pipe body is connected with the front end of the next section of the pipe body, until the back end of the final section of the pipe body is connected with the refueling nozzle. The method realizes visual simulation of the refueling hose, and has a great practical value for researching and analyzing correctness of motion simulation of a soft object, displaying a spatial motion law of the soft object, assessing a simulation algorithm and demonstrating influence of airflow on motion processes and tracks of the refueling pipe and the refueling nozzle in a soft type refueling process; a new way is opened up for researching and analyzing a refueling and receiving connection technology; and the technology also can be applied to virtual visual display and motion research of a soft tubular or similar soft object (such as a cable-stayed bridge).

The invention discloses a method for dispersing hydrogen internal combustion engine hydrogen jet flow and mixing gas. The method includes the first step of determining a mixed gas uniformity evaluation index, and evaluating mixed uniformity of mixed gas in a cylinder by using an nonuniform coefficient nindex of the mixed gas in the cylinder, the second step of building CFD simulation models of an air inlet duct and an air cylinder, and determining the shapes and positions of turbulent flow blocks based on the CFD simulation models, and the third step of installing the turbulent flow blocks, manufacturing the turbulent flow blocks according to the shapes and positions of the turbulent flow blocks in three-dimensional simulation models, and enabling the turbulent flow blocks to be installed in an internal combustion engine. Through reasonable arrangement of the turbulent flow blocks in the air ducts, the method can disperse hydrogen jet flow, increases air inflow vortex, improving mixing speed in hydrogen air, increases mixing uniformity of the hydrogen air, improves dispersing effect of the hydrogen, and achieving uniform mixing of the mixed gas.