1081results about How to "Reduce generation" patented technology

The invention discloses an unmanned aerial vehicle cluster task allocation method based on a large language model optimization genetic algorithm, and belongs to the field of computers. The method comprises the following steps: setting a specific chromosome coding mode; generating a multi-constraint initial population; calculating fitness to quantify the advantages and disadvantages of individual genes of the population; when the optimal individual meets the requirement or the maximum iteration round is reached, ending; retaining the optimal individual as a filial generation; generating a batch of new filial generation individuals by the large language model, and fusing the new filial generation individuals with the current filial generation population; calling an optimized large language model to analyze individual chromosome semantics, and outputting an evolutionary potential score; obtaining an individual comprehensive selection probability by integrating the fitness and the evolution potential score, and executing a selection operation; and selecting individuals based on the individual comprehensive selection probability to carry out crossover and mutation operation to generate offspring. The large language model is embedded into the core link of the genetic algorithm, and the algorithm efficiency is improved by improving the population diversity of the genetic algorithm in the unmanned aerial vehicle cluster task allocation scene.

The application discloses a method for selectively extracting fluorine from a fluorine-containing aqueous solution based on complex extraction, which comprises the following steps: (1) adding a fluorine complex cation to the fluorine-containing aqueous solution to obtain a solution containing metal-fluorine complex ions; and (2) mixing a saponified organic phase with the solution containing the metal-fluorine complex ions and separating phases to obtain a fluorine-loaded organic phase and a raffinate after fluorine removal. The method can achieve the purpose of deep fluorine removal.

The utility model discloses an anti-deformation bearing thin-wall part machining supporting and fixing structure which comprises a base and a supporting assembly, a machining table is connected to the top of the base, clamping blocks are arranged on the two sides of the top of the machining table, and the supporting assembly is arranged in the machining table and comprises a bevel gear ring and a plurality of bevel gears meshed with the bevel gear ring. A lead screw is arranged in the machining table through a plurality of rotating frames, the surface of the lead screw is in transmission connection with a supporting plate through a lead screw nut, the supporting and fixing structure is provided with a supporting assembly, a driving motor drives a bevel gear ring to rotate, a plurality of bevel gears rotate synchronously, then the lead screw is driven to rotate, and the supporting plate ascends to support the interior of the thin-wall part; by means of the internal supporting mode, pressure and friction force borne by the inner wall of the thin-wall part during polishing can be effectively dispersed, deformation caused by lack of supporting is avoided, the size precision, the shape precision and the surface quality of the bearing thin-wall part are guaranteed, the product percent of pass is increased, and waste products are reduced.

The utility model discloses a permanent and temporary combined assembly type underground structure plate wall connecting node which comprises an assembly type underground diaphragm wall, a full-length steel plate is installed on the side wall of the assembly type underground diaphragm wall, and a prefabricated structure plate is hoisted on the full-length steel plate. The gap between the prefabricated structural slab and the fabricated underground diaphragm wall is filled with ultra-high-performance concrete, and a steel bar structure is arranged in the ultra-high-performance concrete. According to the utility model, the rigid connection between the two prefabricated parts is realized, the integrity of the structure is improved, and the safety and durability of the underground structure are fully ensured; an underground diaphragm wall which is usually used as a temporary structure is changed into a permanent structure, so that the construction period is shortened, and the investment is saved; the ultra-high performance concrete poured in the joint can greatly shorten the anchoring length of the steel bars, enlarge the arrangement distance of the steel bars, obviously reduce the using amount of the steel bars on site and the binding workload, is convenient to install and simple in process, obviously improves the construction efficiency, and has high popularization and application value.

The invention relates to the technical field of image semantic segmentation, in particular to an intelligent landslide identification method based on multi-source remote sensing image fusion. Comprising the following steps: calculating a gradient matrix and a water flow convergence index based on a digital elevation model, searching and determining a physical prior interval of cohesive force and an internal friction angle based on geological lithology data, and constructing an input tensor; extracting a surface semantic feature map of the optical image by using visual perception branches through a double-branch coupling network; based on a physical prior interval, mapping branches by using physical parameters, and carrying out nonlinear mapping to obtain a limited rock-soil mechanical parameter diagram; and calling a micro infinite slope stability layer, executing forward derivable calculation based on a limit equilibrium equation, generating a slope stability coefficient field, constructing physical attention gating, executing Hadamard product operation, and generating a semantic feature tensor. Through deep coupling integration and collaborative optimization of the visual perception branch and the physical parameter mapping branch, the true effectiveness of the obtained position data is ensured.

The application discloses a kind of millimeter wave radar and the fusion method and system of visual identification target, the method comprises: obtaining the data information of multiple first target points and multiple second target points;The first target point represents the target object detected by millimeter wave radar sensor, and the second target point represents the target object detected by camera;With the first target point as the center, the absolute threshold set is expanded longitudinally and transversely, to form the first confidence interval;With the second target point as the center, the relative threshold is expanded longitudinally and transversely to form the second confidence interval;The size of the relative threshold is linearly related to the distance and speed of the second target point;KM algorithm is executed to fuse, as many as possible millimeter wave radar detected first target points and camera detected second target points are one-to-one associated as the same target object.The method can improve the target fusion effect and reduce the generation of virtual target.

The utility model provides a shock wave balloon catheter with a backflow device and medical equipment, the shock wave balloon catheter comprises a balloon, a catheter, a fluid pump and a pressure reducing valve, and a shock wave generating part is arranged in the balloon; the balloon is arranged at the far end of the catheter, a pressurizing flow channel and a backflow flow channel are arranged in the catheter, the pressurizing flow channel is used for supplying conductive liquid into the balloon, and the backflow flow channel is used for recycling the conductive liquid from the interior of the balloon; the outlet end of the fluid pump is communicated with the pressurizing flow channel so as to provide conductive liquid with certain pressure for the balloon; the inlet end of the pressure reducing valve is communicated with the backflow channel so as to maintain the pressure of the conductive liquid in the balloon, and the outlet end of the pressure reducing valve is communicated with the inlet end of the fluid pump, so that bubbles formed by separation and electrolysis of the conductive liquid in the percussion process of an electrode in the balloon are discharged out of the balloon in time through the backflow channel. Bubbles are prevented from hindering shock waves from acting on calcification lesions, and the effective performance of the shock waves is improved.

This invention relates to the field of industrial wastewater treatment technology, and discloses an electrocatalytic oxidation device and its operating method for treating saline industrial organic wastewater. Wastewater enters the reaction chamber through the bottom inlet, is forced through the anode channels, and undergoes an electrochemical oxidation reaction on the anode surface to convert chloride ions into hypochlorous acid. A vacuum ultraviolet light source performs in-situ photolysis of water molecules and hypochlorous acid, exciting various active species, including strongly reducing hydrated electrons, strongly oxidizing hydroxyl radicals, and chloride radicals. This device, through the construction of a reduction-oxidation system, can efficiently degrade various pollutants with both electron-rich and electron-deficient characteristics. This invention utilizes the synergistic coupling of electrochemical generation and photochemical conversion to convert high-concentration chloride ions into active precursors, effectively overcoming the bottlenecks of low degradation efficiency and poor selectivity in traditional technologies for high-salt and complex water quality, and significantly improving the system's mineralization efficiency and energy utilization rate.

The application relates to a swing granulator seven-star roller and a mounting structure thereof. The swing granulator seven-star roller and the mounting structure thereof comprise a seven-star roller body, the seven-star roller body is in a cylindrical working surface structure, seven convex granulation corners are uniformly arranged on the outer peripheral wall of the seven-star roller body, the working surfaces of the granulation corners are all arranged in arc structures, and the arc structures are matched with a screen of the swing granulator; a roller mounting mechanism, which comprises a rack, a bearing seat, a bearing arranged in the bearing seat and a rotating shaft penetrating through the bearing, the rotating shaft is connected with an end shaft of the seven-star roller body, the bearing seat is mounted on the rack, a material seepage discharge port is formed in the rack at the bottom of the bearing seat; and a sealing assembly, which is sleeved on the rotating shaft and located at the opening end of the bearing seat. The material can be more fully and uniformly extruded, the hardness of wet particles is effectively improved, the generation of fine powder after drying is reduced, the quality of granular products is improved, the dead angle residual of the material in the equipment is reduced, and the material waste is reduced.

This application provides a display panel, its manufacturing method, and an electronic device. The manufacturing method includes sequentially fabricating an array of anode layers on one side of a substrate; fabricating a pixel definition layer covering the substrate and the peripheral areas of each anode layer, such that the pixel openings of the pixel definition layer expose the central area of ​​the anode layer; and forming a polymer film on the surface of the pixel definition layer away from the anode layer under first design conditions, where the first design conditions include oxygen. In this application embodiment, the formation of the polymer film requires oxygen consumption, which helps reduce oxygen infiltration, thereby reducing the oxygen concentration on the anode surface, thus reducing the surface voltage of the display panel and improving its lifespan.

This application relates to the field of silicone rubber composition processing, specifically disclosing a high-adhesion room temperature curing addition-type silicone rubber composition and its preparation method. The high-adhesion room temperature curing addition-type silicone rubber composition comprises: 100 parts of vinyl polysiloxane, 3-15 parts of crosslinking agent, 0.1-2 parts of catalyst, 8-35 parts of tackifier, 0.5-5 parts of tackifier accelerator, 5-30 parts of reinforcing filler, and 0.01-1 parts of inhibitor. The tackifier includes silane coupling agents containing epoxy and alkoxy groups and MQ silicone resin containing vinyl and alkoxy groups. The preparation method involves: mixing the vinyl polysiloxane with the reinforcing filler, dehydrating and cooling to obtain a base rubber; adding crosslinking agent, tackifier, tackifier accelerator, and inhibitor to a portion of the base rubber, mixing and degassing to obtain rubber compound B; adding a platinum catalyst to a portion of the base rubber, mixing and degassing to obtain rubber compound A; mixing rubber compound A and rubber compound B at a ratio of 1:0.8-1.2, degassing, and curing to obtain the finished product; it has the advantage of high bonding strength.

The utility model relates to the technical field of combustion equipment, and provides a low-nitrogen combustion device for flue gas recirculation, which comprises a circulation frame, a gas delivery pump and a secondary gas mixing mechanism, the circulation frame is provided with a venturi mixing tube group, the venturi mixing tube group is communicated with a uniform gas delivery mechanism for flue gas delivery, the gas delivery pump is mounted on the circulation frame, and the secondary gas mixing mechanism is mounted on the circulation frame. The gas outlet end of the gas conveying pump is communicated with one end of the Venturi mixing tube set through a gas conveying bent tube, and the secondary gas mixing mechanism is installed on the circulation frame, arranged in the Venturi mixing tube set in a penetrating mode and used for conducting secondary acceleration and mixing on gas in the Venturi mixing tube set. The low-nitrogen combustion device for flue gas recirculation solves the problem that in the prior art, when a low-nitrogen combustion device for flue gas recirculation circulates flue gas, the mixing efficiency of the flue gas and air is poor.

The invention belongs to the technical field of synthesis of 2, 3-dipicolinic acid, and relates to a catalyst for synthesizing 2, 3-dipicolinic acid as well as a preparation method and application thereof, the catalyst is prepared from a carrier, and active components and auxiliaries loaded on the carrier; the carrier is boron nitride modified aluminum oxide, the active component is palladium-cobalt bimetal, and the auxiliary agent is magnesium; the catalyst comprises the following components in percentage by mass: 0.2 wt%-3wt% of palladium, 0.5 wt%-4wt% of cobalt, 0.05 wt%-0.3 wt% of magnesium, 5wt%-15wt% of boron nitride and the balance of an aluminum oxide carrier. The catalyst is prepared by adopting an ultrasonic-assisted sol-gel method, so that high dispersion and strong interaction of active components are realized. The catalyst shows high catalytic activity, high selectivity and excellent stability in a dichloropyridine carbonylation reaction, carbon monoxide is used as a carbonyl source, the atom economy is high, and the green chemical requirement is met.

This invention belongs to the field of pharmaceutical technology, specifically relating to the application of a small-molecule antioxidant in mitigating vascular damage in type 2 diabetes. To develop an effective solution for addressing vascular damage in diabetic patients, this invention, through research, discovered that Lithospermoside can specifically inhibit XO in the cell membrane anchoring state, effectively reducing ROS production in the thoracic aorta, thereby significantly reducing BUN, E-selectin, MDA, and UACR. Simultaneously, it inhibits the fluorescence intensity of nitrotyrosine staining, thus alleviating vascular endothelial damage in type 2 diabetes with persistent hyperglycemia. It exerts an antioxidant effect to slow down diabetic vascular damage and protect blood vessels, providing an effective material basis and new ideas for the prevention and treatment of vascular damage in type 2 diabetes.

The invention relates to preparation of fermented milk, in particular to probiotic fermented milk and a preparation process thereof, and the process comprises the following steps: step 1, connecting the fermented probiotic fermented milk to a canning pipe through a pipeline; 2, the canning container is horizontally placed on a transfer belt, and a canning pipe is horizontally inserted into the canning container; thirdly, the conveying belt drives the canning container to move, and the two limiting rods limit and straighten the canning container, so that the canning container is changed from the horizontal state to the vertical state; fourthly, the canning pipe moves along with the movement of the canning container, and canning is completed; the filling process of the probiotic fermented milk can be stably completed, and bubbles are reduced.

The application discloses an intelligent monitoring infusion pump, and particularly relates to the technical field of infusion pumps, which comprises a connecting cylinder, a flow guide monitoring assembly is arranged on the connecting cylinder, the flow guide monitoring assembly comprises a gathering ring embedded in the connecting cylinder, a center block is arranged in the middle of the gathering ring, a baffle is arranged at the bottom of the center block, and a storage cavity is formed between the center block and the baffle. The application can realize manual fine adjustment of the flow of the liquid medicine, rapidly block the air path when the liquid level is abnormal or emergency liquid stopping is needed, realize automatic emergency adjustment of pressure and flow, solve the problem that the prior art can only detect pressure but cannot quickly adjust, meanwhile, the storage cavity formed by the center block and the baffle can temporarily store the liquid medicine, so that the bubbles rise and escape under the action of buoyancy, the bubbles are prevented from entering the blood vessels of a patient along with the liquid medicine, and the defect that bubbles are difficult to eliminate in the prior art is solved.

The application provides a method for inkjet printing of oligonucleotides, and belongs to the technical field of in-situ synthesis of oligonucleotides.The method comprises the following steps: modifying the surface of a solid carrier with a chemically active functional group; depositing oligonucleotide synthesis reagents onto the surface of the modified solid carrier by inkjet to perform in-situ synthesis; and the solvent in the oligonucleotide synthesis reagents comprises one or two of glutaronitrile, acetonitrile and propylene carbonate.The application uses a new type of difficult-to-vaporize solvent, greatly reduces the volatilization of reagents during inkjet synthesis and the generation of organic vapors during synthesis, and thus maintains a high in-situ synthesis reaction efficiency of oligonucleotides.

The application relates to the field of semiconductor process equipment, in particular to a device for large-capacity liquid medicine storage of semiconductor equipment and a liquid medicine supply system. The device comprises a liquid storage tank provided with a liquid storage cavity, the upper portion of the liquid storage cavity is provided with a cleaning cavity in fluid communication with the liquid storage cavity; the internal volume of the cleaning cavity is smaller than that of the liquid storage cavity; a liquid inlet pipe is arranged to introduce liquid medicine into the liquid storage cavity of the liquid storage tank from the outside; a liquid outlet pipe is arranged at the bottom of the liquid storage cavity and connects the liquid storage cavity of the liquid storage tank to a liquid source; a waste pipe is arranged at the top of the cleaning cavity to discharge the liquid medicine bubbles in the cleaning cavity; and a vent pipe is arranged to connect the cleaning cavity of the liquid storage tank with the outside to keep the air pressure in the cleaning cavity of the liquid storage tank consistent with the ambient air pressure. The application improves the separation efficiency of large-capacity liquid medicine and gas, reduces the probability of generating bubbles in the liquid medicine, improves the uniformity of wafer surface coating, and can meet the high-integration equipment layout.

The application provides a preparation method of a diphenylfluorene polyether. The method uses diphenylfluorene as a substrate, butylene oxide as an epoxide monomer, toluene as an organic solvent, and under the action of a composite catalyst, reacts at 110-200 DEG C for 2-6 hours to obtain the diphenylfluorene polyether. The composite catalyst is obtained by reacting a porous aromatic skeleton with a bromoalkyl quaternary ammonium salt to obtain a quaternary ammonium salt functionalized porous aromatic skeleton, and finally, a basic catalyst is limitedly encapsulated in the pore channel of the quaternary ammonium salt functionalized porous aromatic skeleton by electrostatic attraction. The catalyst of the method can be recycled and reused, and the yield retention rate is greater than or equal to 92% after the composite catalyst is used for 5 cycles, and the method is suitable for optical display, high-frequency circuit board, semiconductor packaging and other fields.

The invention discloses a method for preparing nitro-mesitylene through a micro-channel nitration reaction. The method comprises the following steps: respectively conveying mesitylene, fuming nitric acid and sulfuric acid to a micro-channel reaction module through a metering pump, and completing nitration reaction within a retention time of tens of seconds to several minutes. The introduction sequence of nitration reaction materials, the reaction retention time and the reaction temperature are cooperatively controlled, the nitration reaction is completed in the microchannel reactor in a continuous flow mode, operation is easy and convenient, safety is high, efficient continuous production can be achieved, meanwhile, emission of three wastes is reduced, and the industrial application advantages of being environmentally friendly and economical are achieved.

The present application relates to the technical field of chemical experiment, and specifically relates to a chemical experiment table with chemical solution treatment function, which comprises a chemical experiment table composed of a table body, a water tank and a storage rack, a controller is arranged on the table body, the controller is signal connected with a touch display screen, neutralization cavities are symmetrically arranged in the middle of the table body, a PH sensor is arranged in each neutralization cavity, a fixing block is fixedly connected to the side wall of each neutralization cavity, vibration grooves are formed in the two sides of the inner wall of the table body, a neutralization pipe is slidably arranged in the middle of each neutralization cavity, a plurality of through holes are formed in the neutralization pipe, a waste liquid pipe is connected to the top of each neutralization cavity, a three-way pipe is connected to the bottom of each neutralization cavity, a collecting assembly and a sewage assembly are arranged at the other two ends of the three-way pipe respectively, and an auxiliary assembly is arranged in the vibration groove. The structure for preliminary neutralization treatment of chemical solution arranged below the chemical experiment table can avoid the leakage risk and high subsequent treatment cost caused by the temporary storage of the traditional experiment table relying on the collecting barrel.

The application discloses a RFF mixed combustion type garbage heat treatment furnace and method. The furnace body comprises a combustion space, a pyrolysis space, a transfer mechanism and a pyrolysis gas injection port. The first oxygen supply pipeline in the combustion space is divided into upper, middle and lower three layers of injection ports, and three layers of fire zones are formed correspondingly. Solid and gaseous products generated by pyrolysis are sent into the combustion space respectively. The upper layer of injection ports is flush with the pyrolysis gas injection port, oxygen and pyrolysis gas are fully mixed and combusted to form the upper layer of fire zone, the heat of the upper layer and the middle layer of fire zone is used for counter-combusting the solid products, and the lower layer of fire zone is used for completely incinerating the solid products. The method comprises three steps of pyrolysis, counter-combustion and incineration. Through space separation and time sequence optimization, the organic components of garbage are treated in stages, the combustion efficiency is improved, and the generation and residue of harmful gas are reduced.

The invention provides an iron-pollution-resistant catalytic cracking catalyst and a preparation method thereof, and the iron-pollution-resistant catalytic cracking catalyst comprises the following raw materials: a mesoporous and macroporous material, a zinc-aluminum composite material and a molecular sieve, wherein the mesopore and macropore material comprises kaolin and first zinc salt loaded in pores of the kaolin; the zinc-aluminum composite material is obtained by performing solid-phase ball milling on pseudo-boehmite and second zinc salt. The catalytic cracking catalyst provided by the invention has abundant mesopore and macropore structures and excellent iron resistance.

The utility model discloses a wastewater treatment device for triazinone production, which belongs to the technical field of triazinone production and comprises a premixing box, a ferrous sulfate inlet, a wastewater inlet and an acid inlet are arranged at the top of the premixing box, the premixing box is connected with a treatment box, a first spraying component is arranged on the upper portion of the inner wall of the treatment box, and two rotating rods are arranged in the treatment box side by side. A driving piece for driving the rotating rods to rotate is arranged on the two rotating rods, a plurality of conical rods are arranged on the rotating rods, and a liquid outlet is formed in the bottom end of the treatment box; the treatment box is connected with a gas treatment box through a gas outlet pipeline, a gas outlet is formed in the gas treatment box, a second spraying component is arranged at the top end of the inner wall of the gas treatment box, and a liquid outlet is formed in the bottom end of the gas treatment box. A small amount of bubbles generated in the treatment box are punctured through rotation of the conical rod, the bubbles are prevented from being gathered into foam to overflow and corrode the device, volatilized hydrogen chloride is guided into the gas treatment box to absorb hydrogen chloride gas, and environment pollution is avoided.

The application belongs to the technical field of fibroin, and particularly relates to a kind of fibroin composite fibers loaded with nano gold and silver and a preparation method thereof, the preparation method comprises: S1 preparation of fibroin powder: adding cocoon in sodium carbonate solution, washing and drying after stirring, then dissolved in lithium bromide solution, filtration dialysis freeze-drying to obtain fibroin powder; S2 preparation of spinning solution: dissolving cellulose, fibroin powder and nano gold and silver solution in 1-allyl-3-methyl imidazole chloride, water bath stirring to obtain spinning solution; S3 preparation of fibroin composite fiber: after the spinning solution is degassed, fibroin composite fiber is prepared by wet spinning, the application adopts egg white protein as reducing agent and stabilizer, gold and silver inlaid nanoparticles are prepared by green synthesis method, and further, fibroin fiber Au-Ag with good appearance and uniform structure is successfully obtained by wet spinning, which endows the composite fiber with excellent antibacterial performance, thereby expanding its application potential in biomedical field.

This utility model discloses a mold temperature measurement system for a fully automated capsule production line, belonging to the field of pharmaceutical capsule manufacturing technology. It includes an infrared temperature sensor, a PLC controller, and a touchscreen. The infrared temperature sensor is mounted on the mold pushing track before the glue-dipping station via a sensor bracket, with the sensor probe corresponding to the capsule mold after it has reached its position. The PLC controller is connected to the infrared temperature sensor to receive analog temperature signals and convert them into digital temperature values. The touchscreen is communicatively connected to the PLC controller, displaying the current temperature value in real time and storing historical temperature data. The PLC controller is configured to trigger a single temperature sampling after the capsule mold pushing action is completed. This utility model can automatically monitor, store, alarm, and analyze the temperature data of the capsule mold, improving capsule processing quality and reducing waste.

This utility model relates to the field of steering gear lubrication technology, specifically a high-efficiency and energy-saving steering gear transmission device for ships. It includes a steering gear body, a transmission gear set inside the steering gear body, multiple temperature detection units for detecting the internal temperature of the steering gear body, a liquid cooling unit body installed on the outside of the steering gear body, and heat dissipation pipes arranged inside the steering gear body. Coolant absorbs heat from the internal side of the steering gear body through these pipes. This utility model uses liquid cooling, preventing moisture and dust from entering the steering gear body, thus avoiding the shortened service life of the transmission gear set due to moisture and dust. The lubricating oil is heated and stirred before addition to ensure optimal lubrication. A lubrication pump delivers the lubricating oil between the gears, reducing the friction coefficient and heat generation, thus solving the high-temperature problem at its source and protecting the gears, extending their service life.

The application discloses a preparation method of iopromide and intermediates thereof, and particularly relates to the fields of organic synthesis and medicinal chemistry, and the preparation method route is as follows: a compound of formula I is subjected to chlorination reaction, acylation reaction, reduction reaction and iodination reaction to prepare a compound of formula V, and then iopromide is further prepared, the method can not only avoid the generation of diacylation by-products (formula 18), but also effectively reduce the generation of diiodo compounds (formula 24) in the preparation process, the intermediates are easy to separate and purify, and high-purity products can be obtained at a high yield.

The utility model discloses a miniature air pump with noise reduction structure, including motor and motor output end region installation has the noise reduction ventilation structure, the noise reduction ventilation structure includes base, and motor is fixed mounting close to output end shell and base, and motor output end rotation penetrates the base center position, and the penetration end passes through the shaft coupling and connects the swing bar, and the base top installs the fixed seat, and the fixed seat top is equipped with the umbrella cover through the sealing washer, and the fixed seat is provided with four cover holes of rectangular setting, and the base is provided with eccentric wheel, and the fixed seat is located cover hole fixed and is fixed and is communicated with tower shape ventilation cover, and the swing bar top end is rotatably connected with eccentric wheel center position, and the eccentric wheel is fixedly covered and is installed with tower shape ventilation cover bottom, and the noise reduction effect aspect shows outstanding. The unique structure of tower shape ventilation cover increases the gas flow path and the contact area, effectively promotes the smooth airflow in and out, significantly reduces the turbulence and vortex generation, reduces the airflow noise from the source.