3948 results about "Jet flow" patented technology

The invention discloses a tunnel traffic control method and system for multi-mode traffic variable analysis, and relates to the field of general control or regulation systems, and the method comprises the steps: obtaining vehicle operation state information and pollutant concentration distribution data, determining a pollutant generation region based on a vehicle state, and calculating a concentration gradient value and a diffusion rate value. And analyzing the concentration change trend according to the spatial-temporal distribution relationship, and dividing a vertical control region. And setting initial operation parameters of the jet fan in a preset adjustment range and a step length according to the pollutant distribution characteristics of each area. And monitoring area concentration distribution in real time, when a target area exceeds the standard, dynamically adjusting fan parameters of the area and an adjacent area to preset values, and setting illumination parameters of illumination equipment in the vertical control area according to pollutant concentration distribution characteristics. By implementing the method, the accuracy of tunnel partition environment parameter adjustment can be improved.

The invention discloses a tunnel fire air curtain smoke prevention control method and system, and relates to the technical field of intelligent fire fighting, and the method comprises the steps: building a digital twinborn prediction model, and generating a fire source position coordinate and a smoke diffusion trend prediction map through multi-physics field coupling simulation; analyzing the stability requirement of the air curtain jet flow through a Brapare-Prandtt boundary layer analysis algorithm, and generating a jet flow enhancement requirement parameter table in combination with temperature gradient correction; optimizing an acoustic vortex main frequency band by adopting a Slodhaar number, and generating an acoustic vortex control parameter set in combination with a matched sound pressure level and a configured resonator phase difference; and converting the acoustic vortex control parameter set into an execution instruction, monitoring the jet velocity, the vortex street stability and the smoke retardation effect in real time, and dynamically correcting the parameters of the digital twinborn prediction model. According to the method, physical quantity outline matching of the blocking intensity and the sound pressure level is achieved through the sound intensity-momentum equivalent method, and the optimal phase configuration is determined in combination with POD modal analysis.

The air supply type jet aerator comprises a water inlet pipe, one end of the water inlet pipe is connected with an air inlet unit through a first connecting pipe, and the end, away from the first connecting pipe, of the air inlet unit is connected with a second-stage mixing pipe through a second connecting pipe; the end, away from the second connecting pipe, of the second-stage mixing pipe is connected with a third-stage mixing pipe through a third connecting pipe, the end, away from the third connecting pipe, of the third-stage mixing pipe is connected with a spray head through a fourth connecting pipe, the inner wall of the water inlet pipe is connected with a loop assembly, and the inner wall of the second-stage mixing pipe is connected with a contraction unit. And the inner wall of the third-stage mixing pipe is connected with a turnover crushing mechanism. The invention also discloses a jet aeration method of the air supply type jet aerator with porous air inlet and compression circulation. The air supply type jet aerator solves the problem that the existing air supply type jet aerator is easy to cause sludge bulking.

The invention relates to a nozzle attachment assembly (10) with a connecting element (12) having a coupling point (18) arranged on an end face (16) for receiving a flat jet nozzle (20), wherein a jet retention element (14) connects to the connecting element along an axial extension direction (24) of the nozzle attachment assembly (10) and the jet retention element comprises an outlet opening (28) on an outlet side (26) facing away from the end face, which is in fluid-conducting communication with the coupling point through the interior of the nozzle attachment assembly, wherein the fluid-conducting communication is designed as an expansion zone (30) which is bounded in a first plane perpendicular to the axial extension direction by cover walls (34, 36) which have a distance h and which is bounded in a second plane, which is perpendicular to the first plane, by side walls (40, 42).such that the expansion zone replicates a jet geometry of the receptacle flat jet nozzle in such a way that a liquid jet formed with this jet geometry is continuously surrounded by a circumferential gap within the expansion zone in a radial direction (46), and wherein the connecting element and / or the jet retention element has at least one gas inlet opening (50) that opens into the expansion zone. The invention further relates to a system with such a nozzle attachment assembly and a method for jet retention.

The invention relates to the technical field of liquid cooling, in particular to a distributed full liquid cooling device which comprises a liquid cooling distribution module, a liquid supply main pipe, a liquid return main pipe and a plurality of liquid cooling modules, and the liquid cooling distribution module adjusts the flow speed of low-temperature cooling liquid in the liquid supply main pipe according to the total heating value, so that the overall heat dissipation balance of a system is guaranteed; the cooling liquid inlet flow of each liquid cooling unit is accurately regulated and controlled based on the inlet and outlet liquid temperature difference and the real-time liquid supply mass flow of the liquid cooling units in the liquid cooling module and the real-time reference power of the electronic equipment, so that the heat dissipation requirement of the single liquid cooling module can be met; meanwhile, the liquid cooling distribution module can control the opening state of the jet flow unit according to the surface temperature of the heating element in the electronic equipment, and local enhanced cooling can be conducted on the heating element. According to the distributed full liquid cooling device, accurate control from a global system to a local system is realized through distributed management, and heat dissipation requirements of different levels can be met.

The invention relates to a single-phase liquid cooling server and a cooling circulation system. The single-phase liquid cooling server comprises a main machine shell, a jet flow structure, a liquid inlet piece and a liquid outlet piece, the jet flow structure is arranged on the main machine shell, and a cooling medium is arranged in the jet flow structure; the liquid inlet piece is arranged on the main machine shell and connected with the jet flow structure, and the liquid inlet piece is used for driving the cooling medium to be jetted out of the jet flow structure so as to provide jet flow liquid cooling for the interior of the main machine shell; the liquid outlet piece is arranged on the main machine shell, and the cooling medium in the main machine shell is discharged out of the main machine shell through the liquid outlet piece. The jet flow structure carries out heat dissipation on the whole inner cavity, and heat exchange is carried out through the indirect cooling structure, the inner cavity and the outer cavity, so that indirect liquid cooling heat dissipation of the jet flow structure on the second heating element is realized, and liquid cooling heat dissipation is simply and efficiently provided for the single-phase liquid cooling server.

The invention relates to the technical field of homogenizing equipment, and discloses an adjustable gap type high-pressure microjet collision homogenizing valve structure and a homogenizing method.The homogenizing valve structure comprises a valve body provided with a homogenizing channel; the homogenizing valve seat is mounted in the homogenizing channel; the homogenizing valve seat is provided with a plurality of flow guide channels penetrating through the homogenizing valve seat, and the plurality of flow guide channels are arranged around the circumference at intervals; the homogenizing valve element is mounted in the homogenizing channel in a sliding manner; a jet flow cavity is formed between the homogenizing valve core and the homogenizing valve seat; a discharging hole is formed in the center of the homogenizing valve element, and an impact cavity is formed between the end of the discharging hole and the homogenizing valve seat and located in the center of the jet flow cavity. The adjusting device is used for driving the homogenizing valve core to slide and adjusting the distance between the homogenizing valve core and the homogenizing valve seat; wherein the discharging hole is aligned with the center of the homogenizing valve seat, and materials enter the jet flow cavity through the flow guide channel and then enter the discharging hole after being collided by the collision cavity. According to the homogenizing valve structure, the gap and the homogenizing pressure can be adjusted, and the purity of materials is not affected.

The utility model discloses a venturi multistage gas-liquid mixer with parallel jet nozzles, which comprises a liquid inlet pipe, an air suction chamber, a venturi pipe contraction pipe section, a venturi pipe throat pipe section and a venturi pipe diffusion pipe section which are connected in sequence, and a plurality of air inlet pipes are uniformly arranged on the same circumference of the outer side wall of the air suction chamber; seven liquid inlet jet spray pipes are arranged in the air suction chamber, and inlets of the seven liquid inlet jet spray pipes are jointly connected with a liquid inlet pipe. According to the utility model, the problem that gas and liquid cannot be fully mixed into a uniform phase due to low quality of generated bubble groups in the prior art is solved.

The invention relates to the technical field of automatic control, and discloses a pressure closed-loop self-calibration method for an ultrahigh-speed jet injection process, and the method comprises the steps: initializing a system, and building a pressure and temperature combined compensation model; a high-precision sensor is used for collecting real-time pressure and temperature data; by calculating a pressure deviation intelligent switching control strategy, PID is combined with feed-forward compensation in a steady state, and a deep reinforcement learning algorithm is switched to realize quick response in a transient state; automatically triggering closed-loop self-calibration according to operation time or a deviation threshold value, executing zero point and full scale calibration and updating compensation parameters; and carrying out residual analysis by using a digital twinborn model to realize fault diagnosis and early warning. According to the invention, the problems of low control precision and poor long-term stability of an ultra-high-speed jet flow process under nonlinear and large-lag working conditions are solved, and high-precision stable control and system self-adaptive calibration under a wide speed range are realized.

The invention relates to the technical field of electronic equipment, and discloses a piezoelectric heat dissipation unit, a heat dissipation system and a piezoelectric heat dissipation fan, and the piezoelectric heat dissipation unit comprises a piezoelectric element, a vibrating diaphragm, a supporting frame, a jet flow plate, an air outlet plate and a connecting assembly. The supporting frame is provided with a cavity, and the two sides, in the first direction, of the cavity are open. The vibrating diaphragm and the jet flow plate cover the two sides of the cavity in the first direction respectively and are connected with the supporting frame, jet flow holes are formed in the jet flow plate, the piezoelectric element is attached to the side, away from the cavity in the first direction, of the vibrating diaphragm, and the air outlet plates are arranged on the side, away from the cavity in the first direction, of the jet flow plate at intervals. The edge of the air outlet plate is connected with the edge of the jet flow plate through a connecting assembly, the connecting assembly is provided with an air inlet channel, the air inlet channel is communicated with the jet flow hole, and the air outlet plate is provided with an air outlet hole communicated with the jet flow hole. The gas flow channel is reasonable in design, high in heat dissipation efficiency and suitable for heat dissipation of light and thin electronic products.

The invention relates to the technical field of electronic equipment, and discloses a piezoelectric heat dissipation device and a heat dissipation system.The piezoelectric heat dissipation device comprises a shell, a connecting assembly and a piezoelectric assembly, the piezoelectric assembly is arranged in the shell and connected with the shell through the connecting assembly, and the piezoelectric assembly comprises a first piezoelectric element, a vibrating diaphragm, a supporting frame and a jet plate which are sequentially connected in the first direction; a jet hole is formed in the jet plate, and an energy conversion cavity communicated with the jet hole is defined by the vibrating diaphragm, the supporting frame and the jet plate; the shell comprises a shell body and an air outlet cover plate, the shell body is provided with an opening facing the jet flow plate in the first direction, the air outlet cover plate covers the opening and is provided with an air outlet communicated with the jet flow hole, and the shell body is further provided with an air inlet communicated with the jet flow hole. The piezoelectric heat dissipation device is simple in structure and easy to miniaturize, and the structural arrangement of the heat dissipation system is beneficial to improving the heat dissipation effect of the piezoelectric heat dissipation device.

The invention discloses a method for predicting the cleaning performance of a jet impact flat plate based on dimensional analysis. The method specifically comprises the following steps: step 1, establishing a mathematical model of a circular water film formed by the jet impact flat plate; step 2, defining a dimensionless water film radius and dimensionless impact power based on dimensional analysis; 3, a dimensionless wetting angle is defined based on dimensional analysis; 4, applying a Bernoulli equation to the jet flow upward impact flat plate, and deriving expressions of the jet flow speed and the jet flow radius at the jet flow impact point under the gravity influence; and 5, deducing the theoretical impact force of the jet impact flat plate, and deducing the relationship between the jet impact force coefficient and the dimensionless impact power. According to the method for predicting the cleaning performance of the jet flow impact flat plate based on the dimensional analysis, the flow state and the impact force formed by the jet flow impact flat plate are combined, all physical quantities related to the cleaning performance are theoretically deduced, high prediction precision is achieved, and the method has important significance on prediction of the jet flow cleaning performance.

The invention discloses an integrated safety monitoring control method and system for a jet flow axial flow fan, and relates to the field of fan monitoring. The method comprises the steps that fan vibration data of a current fan are collected in real time through a vibration sensor, loosening state data of fan hardware are detected in real time through a displacement sensor, and motor temperature data are collected in real time through a temperature sensor; waveform analysis is carried out on the vibration data to obtain abnormal vibration characteristics, spectral analysis is carried out on the loosening state data to obtain a specific loosening part, and analysis is carried out on the motor temperature data to obtain a temperature abnormal part; carrying out correlation analysis on the abnormal vibration characteristic, the specific loose part and the temperature abnormal part to obtain an overall fault state of the fan; feature matching is conducted on the overall fault state of the draught fan and a preset fault feature library, and when the feature matching degree exceeds a preset matching threshold value, the fault type and the fault danger level of the current draught fan are determined. By implementing the method, the accuracy of fault diagnosis can be improved.

The invention discloses a device for slowing down sloshing of a liquid tank. The device comprises the liquid tank, a linear guide rail sliding mechanism, a combined swash plate device and an automatic springback swash plate device. According to the device for slowing down the sloshing of the liquid tank, a double-sloshing-reduction method is adopted, firstly, the amplitude of the sloshing wave height of the free liquid surface and the kinetic energy of liquid sloshing are weakened in the middle of the liquid tank by means of the automatic rebound swash plate device; liquid sloshing energy is dissipated by means of holes of the combined swash plate device for liquid to enter and exit from the bulkhead, direct action of free surface movement of the liquid on the side wall of the liquid tank is hindered, impact load of liquid sloshing on the bulkhead is reduced, and the phenomena of top rushing and jet flow caused by climbing along the bulkhead are inhibited. Meanwhile, the position of the combined oscillation suppression plate device can be adjusted by means of the linear guide rail sliding mechanism, the energy of liquid oscillation can be dissipated to the maximum extent, meanwhile, the inherent frequency of the liquid tank is changed, resonance can be effectively avoided, and therefore the wave absorption and stabilization effects of the oscillation suppression device can be better exerted.

The invention belongs to the technical field of hypersonic wind tunnel tests, and discloses a test evaluation device and method for a slender body appearance attitude control jet flow aerodynamic interference effect. The test evaluation device comprises a spray pipe bracket, a sieve-shaped core pipe and a balance which are sequentially connected from front to back; the balance adopts an annular structure, a semiconductor strain gauge is pasted on a sensitive element of the balance, the rear end of the balance is connected with a jet-flow supporting rod, and the jet-flow supporting rod is provided with a jet-flow air inlet; a spray pipe is fixed on the spray pipe bracket; a spray pipe outlet penetrates out of the aircraft model; a jet flow pipeline which sequentially penetrates through the jet pipe support, the sieve-shaped core pipe, the aerodynamic force measuring balance and the jet flow supporting rod is arranged on the central axis of the aircraft model. The test evaluation method comprises the steps of conventional force measurement test, jet flow force measurement test, determination of influence quantity of jet flow interference, jet flow supplementary force measurement test, determination of jet flow medium parameters, and establishment of a jet flow state table of the attitude control jet flow engine of the slender aircraft. And technical support is provided for design and installation of the attitude control jet engine of the slender aircraft.

The invention discloses a UHPC jet 3D printing device based on an unmanned aerial vehicle. The UHPC jet 3D printing device comprises the unmanned aerial vehicle. A flight control device is arranged on the unmanned aerial vehicle and used for adjusting the flight attitude and direction in real time; a real-time data transmission device is arranged on the unmanned aerial vehicle and used for transmitting data in the flight process and monitoring result data back to the ground control center in real time; a 3D printing UHPC device is arranged below the unmanned aerial vehicle and comprises a UHPC spraying device, one end of the UHPC spraying device is connected with a high-precision spraying printing head, and the other end of the UHPC spraying device is connected with a UHPC pumping connecting device through a spraying flow device and a power transmission device. The power transmission device controls the jetting speed and the jetting angle through a jetting speed adjusting device and a jetting angle control device. The flexibility of the unmanned aerial vehicle and the jet printing technology are combined, and UHPC construction under the high-altitude, complex or dangerous environment is achieved.

A multi-scale coupling analysis method for a high-temperature liquid metal and jet water interaction system mainly comprises the following steps as shown in an attached drawing: 1, carrying out geometric modeling and grid division on a liquid metal pool type space, jet water and other pipeline systems, and setting a valve action sequence; 2, setting a coupling boundary, and establishing an IPC communication pipeline; 3, performing steady-state calculation, and mutually providing initial boundaries for overall initialization; 4, a system program is imported into the boundary of the two-dimensional fluid domain, the fluid state in the pipeline under the decompression heating condition is calculated, and boundary information in a result is written into the IPC pipeline; 5, the two-dimensional fluid program reads source items from the system program, thermodynamic parameter distribution of the molten pool is calculated, and boundary information is provided; and 6, judging the action condition of the component at the current moment and repeating the step 4 and the step 5 until the calculation time reaches the end moment. The method provided by the invention can simulate the whole interaction process of liquid metal and jet water and embody the influence of flash evaporation in a critical flow jet boundary and an injection pipeline on jet.

The invention provides computing equipment based on a phase change liquid cooling technology. The computing equipment comprises a body, a jet flow component and a power component, the interior of the body is divided into a first containing cavity and a second containing cavity through a partition plate, the first containing cavity is used for containing first cooling liquid, the second containing cavity is used for containing a heating element and second cooling liquid, and the temperature of the second cooling liquid is higher than that of the first cooling liquid; the body is provided with a liquid supplementing opening communicated with the first containing cavity and an exhaust opening communicated with the second containing cavity. The power part is connected with the jet flow part and used for pumping the first cooling liquid into the heating element through the jet flow part. According to the invention, the critical heat flux density can be improved, and efficient jet cooling of a heating element with relatively high heat flux density is realized. Besides, the first containing cavity and the second containing cavity which are divided by the partition plate can contain working media with different temperatures respectively, a proper supercooling environment can be built, meanwhile, the influence of cavitation on the power component is avoided, and the reliability and usability of the power component are guaranteed.

The invention relates to a mechanical pipe cleaning device, and belongs to the technical field of pipe cleaning equipment. The pipe cleaning device is composed of a power section, a centralizing section and a scraping section which are arranged in sequence, and a jet flow spray head is arranged on the centralizing section; a packing cup is arranged on the power joint, a one-way valve is arranged on the packing cup at the tail end, and a circulation hole is formed in the packing cup at the front end of the one-way valve. The pipe cleaning device can form jet flow at the front end of the leather cup to impact chippings at the front end of the leather cup, so that the chippings flow forwards along with high-speed flowing water flow, and it is guaranteed that the chippings are not prone to being accumulated at the front end of the leather cup; scale on the oil conveying guide pipe is scraped and smashed into fine chippings through scraping and energy saving, the mobility of the chippings is improved, the chippings are further not prone to being accumulated at the front end of the leather cup, and it is guaranteed that the chippings are not prone to affecting operation of the device. Meanwhile, jet flow formed at the front end of the leather cup can be used for flushing, scales can be further cleaned, and the cleaning capacity is effectively enhanced. The problem that according to an existing pipe cleaning device, chippings are prone to accumulation, and operation is hindered is solved.

The invention belongs to the technical field of powder metallurgy, and discloses a novel double-circular-seam atomizer and an atomizing device.The novel double-circular-seam atomizer comprises an atomizer base body, a vertically-through melt channel is formed in the middle of the atomizer base body and used for allowing a flow guide nozzle to penetrate through, and the atomizer base body is provided with a cavity coaxial with the melt channel and a circular-seam spraying hole; the cavity is used for inputting high-pressure gas, and the circular seam spraying hole communicates with the cavity and is used for spraying out the high-pressure gas to form high-speed gas flow so as to break metal melt liquid flow flowing out of the flow guide nozzle. The number of the circular seam spraying holes is two, the two circular seam spraying holes are the first circular seam spraying hole and the second circular seam spraying hole, the second circular seam spraying hole surrounds the first circular seam spraying hole from the outer side of the first circular seam spraying hole, and on any longitudinal section plane of the atomizer base body, the jet flow center lines of the second circular seam spraying hole and the first circular seam spraying hole intersect at one point; the melt liquid flow crushing effect can be improved, the diffusion angle of metal liquid drops is increased, formation of large particles is reduced, and metal powder with smaller particle size and better sphericity degree is obtained.

In order to improve the energy conversion efficiency and the output performance, the piezoelectric synthesis jet device based on the combined cavity comprises a base body, a cavity, a nozzle and a piezoelectric vibrator, and a pump cavity is formed in a pump body; the piezoelectric vibrator is arranged in the pump cavity and divides the pump cavity into two cavities; a through hole is formed in the position, with the maximum amplitude, of the piezoelectric vibrator; the pump body is provided with a nozzle at the coaxial position of the through hole; the height, close to the nozzle, of the two cavities is larger than that of the other cavity; the hole diameter of the nozzle is larger than that of the through hole. The device has the characteristics and advantages of low power consumption, high energy density, high jet velocity of the nozzle, small size and easiness in integration.

The invention relates to an airflow jet heat dissipation, dehumidification and dust removal system of a power device, and belongs to the technical field of power supply and distribution. Comprising an electric power device and a protection box body of the electric power device, the electric power device is arranged in the protection box body, at least one airflow ejector is installed in the protection box body, an air outlet nozzle of a jet flow nozzle of the airflow ejector corresponds to the surface of the electric power device, and the jet flow nozzle is in a wedge shape. Jet air generated by the airflow ejector efficiently and uniformly performs heat dissipation, dehumidification and dust removal on the electric power device, so that the purposes of saving air consumption, reducing energy consumption, preventing electric leakage and short circuit of electric appliances, reducing power loss, prolonging the service life of the electric power device and improving the safety and operation stability of the electric power device are achieved.

The invention relates to the technical field of thermal management of energy storage power stations, and discloses an immersion phase change and jet flow cooperative reinforcement thermal management system of an energy storage power station. An immersed phase-change cooling tank body of the system contains an energy storage battery pack and a low-boiling-point fluorinated liquid cooling liquid, so that the whole battery pack is immersed in the immersed phase-change cooling tank body; the condensation recovery device is connected with a steam outlet condensation vaporization medium; the liquid storage distribution unit comprises a main liquid storage tank and a special liquid storage tank, the main liquid storage tank is connected with the condensation recovery device, and the special liquid storage tank is connected with the bottom of the tank body through an electromagnetic drain valve; the multi-layer jet strengthening module comprises a top-layer annular jet pipeline, a bottom-layer annular jet pipeline and a middle-layer annular jet pipeline, the top-layer annular jet pipeline and the bottom-layer annular jet pipeline are connected with a main liquid storage tank and reflow through a circulating pump, and the middle-layer annular jet pipeline is connected with a special liquid storage tank driven by a high-pressure pump and provided with The temperature monitoring array acquires the real-time surface temperature of the battery pack in a distributed manner The dynamic control center is connected with all the modules. According to the system, efficient and uniform heat management of the energy storage battery pack is realized through cooperation of phase change and jet flow.

The underwater cleaning robot for the net cage and the netting comprises a robot central frame, a thrust propeller, a side thrust propeller, crawler wheels, an underwater camera, a tensioning wheel and a water jet cleaning mechanism, the water jet cleaning mechanism comprises a cleaning disc, an adjuster machine body, a water inlet pipe, a water spraying pipe and a petal-shaped cavitation spray head, and the underwater camera collects netting shaking data; after compensation thrust is calculated through feedback, a thrust propeller provides compensation force to counteract shaking of the netting, a tensioning wheel can tension the netting, the robot can be more effectively attached to the net face, in the walking process of the robot, an external high-pressure pump can pump high-pressure water into a regulator machine body through a water inlet pipe, and therefore the net face can be more effectively attached to the net face. The jet flow is sprayed out through the water spraying pipe and the petal-shaped cavitation nozzles to clean the netting, the petal-shaped cavitation nozzles on the two sides incline towards different sides, the sprayed petal-shaped cavitation fluid can drive the regulator body to rotate, rotary cleaning is achieved, and the cleaning area range and cleanliness of the jet flow are improved.

The invention relates to the technical field of electronic equipment, and discloses a piezoelectric cooling fan which comprises a piezoelectric element, a vibration plate, a supporting frame, a jet flow plate and an air outlet plate. The supporting frame is provided with a cavity with the two sides open in the first direction. The vibration plate and the jet flow plate are arranged on the two sides, in the first direction, of the cavity in a covering mode respectively and connected with the supporting frame, and jet flow holes are formed in the jet flow plate. The piezoelectric element is attached to the side, away from the cavity in the first direction, of the vibrating plate and / or the side, away from the cavity in the first direction, of the jet plate, a center hole is formed in the piezoelectric element, and the air outlet plates are arranged on the side, away from the cavity in the first direction, of the jet plate at intervals. The air outlet plate is provided with air outlet holes communicated with the jet flow holes. According to the piezoelectric cooling fan, fatigue cracks caused by long-time use of the piezoelectric element can be avoided, and the service life of a product is greatly prolonged.

The utility model relates to the technical field of axially split pumps, in particular to an axially split pump impeller with offset blades and an axially split pump. The axially split pump impeller with the offset blades comprises a front cover plate, a hub, a plurality of long blades and a plurality of short blades, the hub is arranged in the front cover plate, and the long blades and the short blades are arranged between the hub and the front cover plate; the multiple long blades are evenly arranged around the axis of the impeller, and the short blades are arranged between every two adjacent long blades. Projections of one end, far away from the axis of the impeller, of each long blade and one end, far away from the axis of the impeller, of each short blade in the axial direction of the impeller are distributed on the circumference of the same circle; each short blade is provided with a pressure face and a suction face which are opposite. According to the axially split pump impeller with the offset blades, the flow field in the blade channels can be improved, the pressure gradient of an outlet of the impeller can be greatly reduced, the wake flow area of the outlet of the impeller is reduced, and smooth transition of the speed and pressure from the wake flow area to a jet flow area is achieved.

The buried person search and rescue device comprises a portable drilling machine, the portable drilling machine is provided with a plurality of hollow drill rod sleeves, a gas conveying channel used for conveying gas to the ground is arranged in a drill rod, and a gas outlet of the gas conveying channel is connected with a sampling gas inlet of a gas component analysis device through a gas conveying pipe. A gas purifying and filtering device and a gas extracting pump for extracting gas are connected to the gas conveying pipe in series; a plurality of air inlets communicated with the air conveying channel are formed in the side wall of each drill rod sleeve in a surrounding mode, a jet flow nozzle is arranged at each air inlet in the drill rod sleeve, each jet flow nozzle is installed at an outlet of an injection pipe, each injection pipe is connected with an electromagnetic valve in series, and an inlet of each injection pipe is connected with the jet flow pipe. The invention aims to provide the device for searching and rescuing the buried persons, which can remarkably improve the search and rescue efficiency and effect in a complex geological disaster scene, and further realize the rapid search and rescue of the trapped and buried persons in earthquake, landslide and debris flow disasters and the search and rescue of the remains of the victims.

Device for laser cladding comprising a jet nozzle (1), and a rotationally symmetrical workpiece (100), wherein the beam nozzle (1) has a light channel (3) for guiding at least one laser beam directed at the workpiece (100); and a powder unit (7) arranged radially outside the light channel (3) for guiding at least one powder jet to be applied to the workpiece (100); has wherein a cross-sectional area of ​​the light channel (3) extending orthogonally to a longitudinal direction of the jet nozzle (1) is stretched, deviating from a circular shape, essentially parallel to the circumference of the workpiece (100).

The invention discloses a self-adaptive pre-pressure-relief danger relieving device for a deep mine. The self-adaptive pre-pressure-relief danger relieving device comprises a supporting assembly. The supporting assembly comprises two side supporting plates which are symmetrically arranged, a top supporting plate is installed on the tops of the side supporting plates through connecting plates, and a plurality of pressure relief buffering assemblies which are arranged at equal intervals are installed on the outer walls of the side supporting plates and the outer wall of the top supporting plate. A pressure relief channel is established through the drilling assembly, continuous and directional hydraulic pressure relief is achieved in combination with the jet flow pressure relief assembly, rock mass fractures are effectively expanded, in addition, high-energy shock waves can be rapidly released through the blasting pressure relief assembly, strong pressure relief is achieved, and the device is suitable for a high-stress area; the jet flow pressure relief assembly and the blasting pressure relief assembly are switched in the hollow anchor rod, and an external water supply system and a blasting control system are connected, so that a mine has high adaptive capacity and safety performance according to different pressure relief requirements.

The invention discloses a micro-channel flow control method based on deep reinforcement learning (DRL), and belongs to the field of flow stability and active flow control. According to the method, the DRL control technology is innovatively applied to the micro-channel environment, and the jet flow of jet holes in the surface of an array cylinder is regulated through an agent to act as an execution action to act on a flow field environment obtained through direct numerical simulation (DNS). A reward function is designed with reduction of vortex shedding and vortex-induced oscillation as targets, the action effect is fed back, a control strategy is optimized, an agent can accurately recognize the key moment of vortex shedding and apply effective control action, and therefore formation of a vortex structure is destroyed, and active flow control is achieved. Simulation results show that the method has high-precision recognition capability and good robustness in a micro-channel environment, and meanwhile, non-dimensionalized parameters provide theoretical basis and technical support for popularization and application of the method in other engineering fields.