672 results about "Jet (fluid)" patented technology

The invention relates to an array type underwater propeller with high maneuverability and low energy consumption, a pump jet generating device and a flow divider jointly form a propeller front end, an intelligent fluid director forms a propeller rear end, and the pump jet generating device drives an impeller through a rotating motor to drive surrounding water flow to rotate to generate a main jet flow; an isolation structure is arranged in the flow divider and used for evenly dividing the main jet flow into multiple strands of independent sub jet flows, and all the sub jet flows form propelling power after entering the intelligent flow guider to be guided. The intelligent fluid directors are connected with the flow channels of the flow divider in a one-to-one correspondence mode and used for converting fluid flowing out of the flow divider and out of the jet flow face into effective action jet flow with the adjustable flow speed. The intelligent fluid director comprises a jet flow end regulation and control mechanism and a pressure relief end regulation and control mechanism, and the jet flow end regulation and control mechanism is used for independently regulating the flow speed of effective jet flow ejected from the fluid director; and the pressure relief end regulation and control mechanism is used for maintaining the constant flow velocity at the inlet of the fluid director by releasing part of water flow when the effective jet flow velocity is regulated.

The invention relates to the technical field of jet milling, in particular to a jet milling control method for a fluidized bed jet mill. The method comprises the following steps: acquiring the scattered particle weight increment of large particles and the fine weight increment of fine particles between adjacent sampling moments; dividing into an initial increasing stage and a uniform increasing stage according to the numerical value change of the weight increment of the scattered particles at the maximum value position; in the initial increasing stage, the retention degree is determined according to the trend change of the small weight increment; the drag force degree is determined according to the numerical comparison of the fine weight increment and the granular weight increment in the initial increasing stage and the uniform increasing stage; and determining an adjustment coefficient of the jet milling pressure by combining the retention degree and the drag force degree at the current moment, and regulating and controlling the jet milling pressure at the current moment according to the adjustment coefficient. The airflow crushing pressure can be adjusted and controlled more objectively and reasonably, and the airflow crushing efficiency is effectively improved.

A system and method for enhancing marine vessel efficiency through integrated hull optimizations is disclosed. The system includes automated bow thruster covers that reduce hull drag and condition water flow, coupled with strategically positioned air lubrication nozzles that create and maintain an air layer under the vessel. The bow thruster covers may be configured as circular doors or parallel panels, optionally incorporating air discharge ports or working in conjunction with dedicated air jets. An intelligent control system optimizes the integrated components using real-time sensor data and computational fluid dynamic analysis. The system modulates air distribution and cover positions based on sea conditions and vessel speed, maintaining optimal efficiency during operation. External surfaces may incorporate superaerophilic structures to enhance air retention and reduce drag. The comprehensive integration of these components provides improved hydrodynamic efficiency while maintaining full bow thruster functionality when required.

The invention relates to the technical field of mixing pile machines, in particular to a two-way mixing drill bit structure for a mixing pile machine and a construction method.The two-way mixing drill bit structure comprises a sleeve body, and multiple sets of sleeve holes are formed in the outer wall of the sleeve body; a rotary shaking mechanism is arranged in the sleeve body, and an air injection blowing mechanism and a bidirectional rotating mechanism are arranged on the sleeve body; the rotary shaking mechanism comprises sliding grooves formed in the inner wall of the sleeve body and corresponding to the two sides of the sleeve hole, the inner wall of each sliding groove is slidably connected with a lifting plate, a spring is fixedly connected to the position, corresponding to the interior of the corresponding sliding groove, of one end of the outer side of each lifting plate, and each spring is fixedly connected with the corresponding sliding groove. According to the device, a lifting plate can move inwards and outwards, so that a pushing column is driven to do the same movement, soil in a sleeve hole is pushed away, the sleeve hole is prevented from being blocked by the soil, and the flowability of the sleeve hole is guaranteed.

The invention discloses a distributed jet active flow control-based rotor wind tunnel test method, which belongs to the technical field of aviation aerodynamic wind tunnel tests, and comprises the steps of rotor test bed dynamic characteristic test, manipulation matrix calibration, preposed preparation of rotor model dynamic balance and common taper adjustment, and dynamic balance and common taper adjustment. And then hovering and forward flight wind tunnel tests of distributed jet active flow control are carried out in sequence, test data are collected and processed, and the aerodynamic performance of the rotor wing under the condition that jet control exists or not is compared and analyzed. According to the invention, the industrial blank of the lack of a distributed jet active flow control rotor wind tunnel test method is filled, and key technical support is provided for theoretical research, technical optimization and engineering application of the rotor distributed jet active flow control method.

Provided herein are shaped-charges having curved walls to provide better controllable and improved liquid jet parameters. The shaped-charge comprises a container having a plurality of curved walls for containing a liquid. One or more explosive charges are immersed in the liquid and a detonator channel positioned through the container wall to controllably detonate the one or more explosive charges and from a wedge-shaped liquid jet. Multipoint initiation is achieved using a number of initiation points; a location of one or more initiation contact points with the geometrically-shaped explosive charges; and / or an initiation timing of each of the initiation contact points, including simultaneous initiation or a sequence of initiations. Also provided are related methods of forming liquid jets and attendant applications, including target disruption.

The invention discloses a rapid calculation method for flow field prediction of a compression system of a variable cycle engine, and the method comprises the steps: building a parameterized mapping model of valve opening and total pressure distribution based on a wall attachment turbulent jet theory; the fan state conversion process is dispersed into a plurality of quasi-steady-state working conditions according to the actuation angle range of a mode selection valve; constructing a total pressure distribution and recovery coefficient prediction module under each working condition by using the parameterized model; the prediction module is embedded into a fluid mechanics solver in the form of boundary conditions, numerical simulation of the state transition process is completed, and performance change data are obtained. According to the scheme, full-three-dimensional complex calculation is replaced by parameterized mapping, the efficiency and precision of variable circulating fan mode conversion performance analysis are remarkably improved, meanwhile, the calculation cost is reduced, and quick-response technical support is provided for compression system optimization design.

The invention provides a Venturi tube anti-flash-rust agent filling mechanism which comprises a Venturi jet device, the inside of the Venturi jet device is sequentially provided with a first inlet section, a first contraction section, a first throat part and a first diffusion section from left to right, the first inlet section is cylindrical, the first contraction section is gradually contracted from the tail end of the first inlet section, and the first throat part is communicated with the first diffusion section. The first throat part is the position with the smallest pipe diameter, and the first diffusion section is gradually enlarged from the tail end of the first throat part. Compared with the prior art, the device has the following beneficial effects that the independent mixing mechanism is arranged, the mixing cylinder is integrated at the joint of the venturi jet device and the venturi flow meter, and not only is the mixing impeller arranged in the cylinder, but also the baffle plates arranged at equal intervals are arranged in the cylinder. When the fluid flows through the mixing cylinder, the mixing impeller rotates under the pushing of the fluid to actively stir the flash rust preventing agent and the main fluid, and the baffle plate further changes the flow direction of the fluid to form a turbulent flow effect, so that the mixing uniformity is greatly improved.

The invention relates to the technical field of micro-nano bubbles, discloses a gas-water double-shearing micro-nano bubble generation method and equipment, and comprises the gas-water double-shearing micro-nano bubble generation equipment. Comprising a water spraying unit for generating high-speed atomized water flow, a gas-water premixing unit for premixing gas and water by adopting gas-water rotary cutting, a gas-water mixing unit for adopting rotary cutting, a gas-water double-shearing mixing unit for gas-water double shearing and a uniform stabilizing unit for stabilizing and discharging micro-nano bubbles. Based on the phenomena of self-excited oscillation, jet mixing and gas-liquid interface in fluid dynamics, by combining various mature fluid dynamics principles of cavitation effect, Venturi effect, shear breaking, impinging stream mixing and static mixing, the design of multiple gas chambers is added, especially the cavitation cavity, the annular gas chamber and the double-shear configuration, gas self-absorption is achieved, and the gas self-absorption effect is achieved. And the generation efficiency and uniformity of the bubbles are effectively improved.

The present invention relates to a multistage series microreactor and a fluid mixing method. The microreactor includes a base internally etched with a fluid passage, the base being provided with a fluid inlet and a fluid outlet which are communicated with the fluid passage, where the fluid passage includes a plurality of micro mixing tanks, a jet port is formed at an inlet of the micro mixing tank, adjacent micro mixing tanks are connected by jet port at a contraction section, and a splayed flow baffle plate and a flow splitting column which are arranged corresponding to the jet port are provided in the micro mixing tank, the flow splitting column being arranged below the splayed flow baffle plate. By means of a jet manner, a fluid to be mixed in the invention can be continuously split, compounded, stretched and crushed, thereby realizing rapid mixing and efficient, continuous reaction.

A jet impingement cooling apparatus includes a target having a flat surface and a plurality of recesses recessed from the flat surface, and a jet member having a plurality of orifices aligned with the plurality of recesses, respectively, wherein a cooling fluid is ejected from each orifice to the plurality of recesses.

The invention relates to a staggered jet flow micro-channel heat dissipation device which comprises a cover plate layer, a manifold layer, a jet flow layer and a micro-channel layer which are stacked in sequence, a fluid inlet and a fluid outlet are formed in the cover plate layer, the manifold layer is used for shunting fluid at the fluid inlet, jet flow holes and backflow holes which are distributed in an array mode are formed in the jet flow layer, and the micro-channel layer is used for cooling the fluid at the fluid outlet. The jet flow holes and the backflow holes are distributed in a staggered mode, heat dissipation grooves are formed in the micro-channel layer, columnar pin fins distributed in an array mode are arranged in the heat dissipation grooves, pin fin micro-channels are formed, and the axial direction of the columnar pin fins is parallel to the jet flow direction of the jet flow holes. Fluid ejected out of the jet flow holes absorbs heat, boils in the pin-fin micro-channels and transversely flows, and based on staggered distribution of the jet flow holes and the backflow holes, the transversely-flowing fluid in the pin-fin micro-channels is in staggered reverse flow and flows to the fluid outlet through the backflow holes. Compared with the prior art, the temperature uniformity of a heat dissipation object is improved, generation of local hot spots is effectively restrained, and the heat exchange efficiency is greatly improved.

The invention belongs to the technical field of erosion corrosion experiment testing, and particularly discloses an erosion corrosion experiment device and method for liquid-solid two-phase flow immersion jet flow, a cooling system is designed for solving the problem that the temperature of an erosion corrosion solution is increased due to the throttling effect, the heat dissipation area of a circulating erosion system is increased through finned tubes, and the heat dissipation efficiency is improved. And the erosion corrosion solution flowing through the finned tube can transfer heat to the liquid in the heat exchange groove, so that the temperature of a fluid medium of the erosion corrosion solution in the circulating erosion system is reduced. According to the invention, the included angle between the sample and the nozzle can be changed through the angle adjusting mechanism so as to test the material damage condition under the impact of different angles and different flow velocities, so that the real-time monitoring of the electrochemical process of the liquid-solid two-phase flow damaged material is realized; the erosion corrosion damage process and mechanism of a material in a multiphase flow environment can be researched conveniently, and gas can be injected into the immersion jet tank through the gas storage bottle and the gas injection pipe so as to realize an under-pressure experiment for dissolving acid gas.

The invention relates to a jet pump (100) for conveying a suction fluid (242) in a refrigerant circuit (200) of a temperature control system using a propellant fluid (231) and utilizing the Bernoulli effect, wherein the jet pump (100) has a primary nozzle (103) for accelerating the propellant fluid, a secondary connection interface (102) for supplying the suction fluid, a mixing tube (104) downstream of the primary nozzle (103) and downstream of the secondary connection interface (102), and a diffuser (105) downstream of the mixing tube (104), wherein in an end section (140) of the mixing tube (104), which is located at an end of the mixing tube (104) furthest from the primary nozzle (103) and closer to the diffuser (105), a thrust edge (130) is provided which is configured to act in a supersonic The flow in the mixing tube (104) is intended to trigger a compression pulse in the final section (140). Furthermore, a refrigerant circuit (200) with such a jet pump (100) is proposed.

The application discloses a gas-liquid mixed delivery pump and a gas-liquid mixed delivery method, and relates to the technical field of pumps. The pump body is detachably connected to a bearing box; a bubble dispersion plate is arranged in a suction chamber; a rotating shaft penetrates through the bearing box and extends into the pump body, a mechanical seal assembly is sleeved on the rotating shaft and located in the bearing box; a premixing impeller and a centrifugal impeller are arranged at intervals along the rotating shaft and located in the pump body, the outlet of the premixing impeller is in fluid communication with the inlet of the centrifugal impeller; a side wall of the suction chamber is provided with a jet device; a diffuser is arranged between the outlet of the centrifugal impeller and the inlet of a discharge chamber; and the outlet of the discharge chamber is connected to an outlet pipeline. The two-stage crushing structure of the bubble dispersion plate and the jet device reduces the gas phase aggregation phenomenon, improves the gas-liquid mixing uniformity, and avoids the efficiency reduction of the centrifugal impeller caused by the gas phase aggregation; the diffuser can specifically inhibit the gas-liquid separation, cooperates with the premixing effect of the premixing impeller, and widens the adaptation range of the pump body to different gas rate working conditions.

A filament mesh structure, methods of manufacture and forming the filament mesh structure, and seat assembly having the filament mesh structure. The filament mesh structure may be cut by a fluid jet, may be heated with fluid to facilitate reshaping, or both. The filament mesh structure may be provided with a foldable connecting segment that facilitates folding of the filament mesh structure.

The application discloses a step variable pressure type micro-channel heat dissipation structure and a high-power laser cut-off light screen, and the structure comprises a flow channel (3), a gradually widened micro-channel (4), a first step variable pressure structure (5) and a second step variable pressure structure (6). The first step variable pressure structure (5) and the second step variable pressure structure (6) comprise a plurality of step-by-step increased elliptical cylinder arrays, the number of the elliptical cylinders is step-by-step increased, the length of the short axis of the elliptical cylinder is step-by-step decreased, the fluid flow cross-sectional area is step-by-step decreased, and the flow speed is step-by-step increased to form a jet effect to accelerate the fluid, and finally the fluid enters the gradually widened micro-channel (4) at a higher flow speed to realize flow heat exchange. The step variable pressure structure with the step-by-step increased number of elliptical cylinders, the step-by-step decreased length of the short axis and the step-by-step decreased total flow cross-sectional area at the micro-channel inlet section can rapidly and gradiently increase the pressure to accelerate the fluid, and effectively solve the problems of excessive and concentrated pressure at the micro-channel inlet.

The invention discloses a magnetorheological polishing liquid supply system and method based on a jet technology, and relates to the technical field of magnetorheological polishing, the magnetorheological polishing liquid supply system comprises a liquid storage and conveying module, the liquid storage and conveying module comprises a liquid storage device, a conveying device and a pulsation attenuation module, and the magnetorheological pulsation attenuation module is provided with a magnetorheological pulsation attenuator which is connected in series between an outlet of a servo variable pump and a conveying pipeline; the spraying execution module comprises a nozzle and a position adjusting assembly; the multi-dimensional detection module comprises a visual sensor, a Coriolis flow meter and an MEMS pressure sensor; the modeling and predicting module is used for calculating pipeline resistance according to the relative position of the nozzle and the workpiece and predicting pulsation by decomposing a pump pulsation rule through Fourier transform; and the dynamic regulation and control module is used for controlling the attenuator to counteract the pulsation according to the pulsation prediction output reverse current, and regulating the displacement and the rotating speed of the pump in real time through a fuzzy PID algorithm in combination with preset target flow and pressure. The problem that in the prior art, the injection parameter control precision is limited is solved, and high-precision regulation and control are achieved.

The invention relates to the technical field of radiators, and particularly provides a jet impact micro-channel heat dissipation device for server liquid cooling, which comprises a shell, the shell comprises an upper cover plate and a lower cover plate, and the lower cover plate is attached to a chip for heat dissipation; inlets are formed in the front and back of the upper cover plate, outlets are formed in the left and right of the lower cover plate, cooling fluid enters from the inlets, flows into the drainage cavity after entering the diversion layer, enters the annular cavity from the drainage cavity, and enters the lower cover plate through a turbine diversion module of the annular cavity; the high-heat-conduction ceramic layer is arranged on the cover plate on the lower portion of the liquid inlet, the pre-rotation effect brought by the turbine flow guide module enables the jet flow speed of the liquid outlet to be distributed more evenly, the impact heat exchange efficiency of jet flow on the high-heat-conduction ceramic layer is improved on the basis that the flow resistance is remarkably reduced, and the heat exchange efficiency is improved. Moreover, the high-thermal-conductivity ceramic layer enhances the wettability of the surface and accelerates the heat dissipation of the hot spot area of the chip, and then the cooling fluid flows out from the outlet. Compared with the prior art, the heat dissipation efficiency and the energy efficiency ratio are extremely high, and the heat dissipation requirement of a high-heat-flux hot spot of a high-power server is met.

The present application relates to a kind of staggered jet microchannel heat sink, including cover layer, manifold layer, jet layer and microchannel layer stacked in turn, cover layer is equipped with fluid inlet and fluid outlet, manifold layer is used to shunt the fluid of fluid inlet, jet layer is equipped with array distribution jet orifice and backflow hole, jet orifice and backflow hole staggered distribution, microchannel layer is equipped with heat dissipation groove, heat dissipation groove is equipped with array distribution columnar needle fin, and form needle fin microchannel, the axial direction of columnar needle fin and the jet direction of jet orifice are parallel to each other;Fluid emitted by jet orifice is boiled and carries out transverse flow in needle fin microchannel and absorbs heat, based on the staggered distribution of jet orifice and backflow hole, the transverse flow fluid in needle fin microchannel presents staggered counterflow, and flows to fluid outlet by backflow hole.Compared with prior art, the present application improves the temperature uniformity of heat dissipation object, effectively suppresses the generation of local hot spot and greatly improves heat exchange efficiency.

The invention discloses a three-sleeve micro-channel jet reactor which effectively solves the problems that a high-viscosity mixing system is difficult to disperse and poor in mixing and heat exchange efficiency. In dispersing and mixing, a first middle pipe is provided with a plurality of first conical holes, fluid flows through the first conical holes to generate a jet effect, turbulent flow is enhanced, laminar flow of a high-viscosity system is broken, and mixing is promoted; a first arc-shaped flow guide plate on the outer wall of the first inner pipe guides first inner annular space fluid, changes a flow field, increases turbulence and shearing, and strengthens mixing. In the aspect of heat exchange, a three-sleeve structure is adopted, the first sleeve section and the second sleeve section are respectively provided with an inner pipe, a middle pipe, an outer pipe and corresponding annular gaps, the second inner pipe is communicated with the first inner pipe, and the second middle pipe is communicated with the first middle pipe, so that the inner annular gaps are communicated. The heat exchange area is increased through the multi-annular-gap structure, fluid can fully exchange heat when flowing in different annular gaps, convective heat transfer is enhanced through flowing of multiple strands of fluid, and then the overall heat exchange efficiency is improved.

The utility model relates to the technical field of tubular heat exchangers, in particular to a jet heat exchanger. The axis of the horizontal structure is longitudinally horizontal; comprising a left tube box, a left tube plate, a left barrel, a conical section, a barrel, a right tube plate and a right tube box which are sequentially connected from left to right. The heat exchanger further comprises a medium inlet, a medium outlet, heat exchange tubes and baffle plates. The medium inlet is vertically arranged and is vertically and fixedly connected to the top of the left barrel body; the medium outlet is vertically arranged and is vertically and fixedly connected to the bottom of the right end of the cylinder body; the plurality of baffle plates are vertically arranged and are fixedly connected into the cylinder body; the axes of the heat exchange tubes are longitudinally horizontal, and the two ends are connected with the left tube plate and the right tube plate respectively. The flow field distribution is relatively uniform, almost no heat transfer dead zone exists, the shear stress between the tube bundle and the supporting structure is effectively reduced, the transverse scouring to the tube bundle is also eliminated, the fluid induced vibration is effectively eliminated, and the wear of the tube bundle is reduced.

The utility model relates to powder conveying technical field especially is concerned on a kind of catalyst carrier powder conveying equipment;Including the hopper of cone angle ≥70 °, the roughness Ra of the inner wall surface of hopper ≤0.4 μm, pneumatic flow-aiding ring is set in the height ≤1 / 3 cone height of hopper lower part and the height from discharge port, and the annular air cavity of pneumatic flow-aiding ring is connected outside gas source;Pneumatic flow-aiding ring circumferentially distributes first nozzle group and second nozzle group, and the jet direction of first nozzle group is inclined upwards along hopper inner wall, for fluidizing powder layer in advance;The jet direction of second nozzle group is inclined downwards along hopper inner wall, for promoting powder slip.

The present application belongs to the technical field of geotechnical engineering and indoor test, and provides a visual test device and method for interaction between high-pressure rotary jet flow and soft soil, which comprises a detachable model box, a jet medium simulation system, a high-pressure rotary jet flow generation system, an overburden pressure simulation system, a data acquisition system and a tracing system.The test device has the advantages of high visual degree, detachability, easy assembly and easy production.The jet medium simulation system has significant shear thinning characteristics, and has a high degree of reduction of the non-Newtonian fluid properties of cement slurry, which not only overcomes the problem of easy blockage of the pipeline, but also avoids distortion defects.The trajectory of the fluorescent powder particles in the jet medium simulation system can be captured by a high-speed camera under the irradiation of the pulsating laser beam generated by the pulsating laser, so as to accurately reproduce the flow field information of the high-pressure rotary jet flow in the soft soil.

The present application belongs to the field of oil drilling technology, and discloses a PDC drill bit for rock breaking by pressure pulse impact oscillation. The specific technical scheme is as follows: the PDC drill bit for rock breaking by pressure pulse impact oscillation is composed of an upper threaded joint, a shell, a jet pulse block and a drill bit. The jet pulse block is composed of a fluid inlet, a left feedback channel outlet, a right feedback channel outlet, a left fluid channel, a right fluid channel, a left backflow feedback inlet, a left backflow annular fluid channel, a right backflow feedback inlet, a right backflow annular fluid channel, a fluid outlet and a fluid outlet cavity. After the drilling fluid passes through the upper threaded joint, it enters the jet pulse block from the fluid inlet, and then passes through the fluid outlet and flows out from the drill bit water eye. When the drilling fluid passes through the jet pulse block, the flow direction of the drilling fluid will change periodically due to the action of the feedback channel, and a pressure pulse will be generated, forming impact oscillation, and thus accelerating the rock breaking and drilling of the drill bit. The present application has the function of improving the rock breaking efficiency of the drill bit by relying on pressure pulse impact oscillation.

The utility model belongs to the technical field of agricultural production, and particularly discloses an airflow crushing device for pesticide production, which comprises a crushing cylinder, a feed valve is arranged at the top of the crushing cylinder, a material control valve is arranged at the bottom of the crushing cylinder, and the output end of the material control valve is fixedly communicated with a discharge pipe. A plurality of groups of airflow jet nozzles are arranged in the crushing cylinder, a circulating pushing mechanism which is repeatedly blown by the airflow jet nozzles is arranged in the crushing cylinder, and a dust purification mechanism is arranged on the outer surface of the crushing cylinder. According to the airflow crushing device for pesticide production, pesticide raw materials can be continuously conveyed upwards and then fall through the circulating material pushing mechanism, airflow sprayed by the airflow spraying nozzles is repeatedly received in the falling process, the raw materials are repeatedly blown in this way, bonding is gradually released, and the fluidity of the raw materials is improved; and therefore, the raw materials are more easily dispersed into fine particles by the airflow, and a more uniform crushing effect is realized.

The utility model relates to the technical field of rotary ejectors, and discloses a storage tank modified rotary ejection stirrer which comprises a driving impeller and an ejection nozzle, and the driving impeller is horizontally arranged and is designed to face an oil inlet pipeline; the radial flow of fluid is enhanced, stronger turbulent flow is formed, uniform mixing of oil products is promoted, the blending efficiency and quality are improved, and a shaft rod connected to a driving impeller is horizontally and rotationally arranged in an oil inlet shell; the spraying nozzle is used for spraying oil in all directions to blend the oil in the oil storage tank so as to prevent sedimentation; a plurality of jet nozzles are annularly arranged on the jet shell above the oil inlet shell at equal intervals; the jet nozzle comprises a bent pipe which is communicated with the flange interface on the jet shell through a flange plate A and a nozzle which is in threaded butt joint with the bent pipe; the spraying direction and angle of the spraying nozzle are adjusted by detaching and replacing the bent pipe and the spraying nozzle so as to meet different adjusting requirements, and the operation flexibility and the system adaptability are improved.

The invention belongs to the technical field of oil and gas field development, and particularly relates to a fracturing spray gun with a protection mechanism and a method. The spray gun comprises a spray gun body and a protection mechanism, the protection mechanism is connected to the outer side wall of the spray gun body. The two ends of the spray gun body are provided with a connecting thread and a connecting cylinder respectively, wherein the connecting thread and the connecting cylinder are connected with the fracturing fluid release end. A nozzle is arranged on the side wall of the spray gun body, a nozzle opening is formed in the center of the nozzle, and a jet flow hole in the nozzle opening is obliquely formed, so that back-splashed fracturing fluid and sand rebound to the protection mechanism at a set angle; a through hole is formed in the side wall of the protection mechanism and corresponds to a nozzle in the side wall of the spray gun body. According to the working state of the fracturing spray gun, automatic adjustment can be achieved, impact of backwash of fracturing fluid is effectively buffered, protection of the fracturing spray gun is enhanced, and the fracturing spray gun can be protected in all directions. The operation is simplified, the reliability of the equipment is improved, and the service life of the equipment is prolonged.

This utility model relates to a fluid nozzle, particularly a high-efficiency entrainment-type fluid mixing jet nozzle. It includes a nozzle body, characterized by a double-layer structure comprising an outer circular tube and a central guide cone arranged concentrically; both the outer circular tube and the central guide cone have ejector holes and baffles at their fluid outlet ends. The structure is simple and can be used not only for gas entrainment mixing but also for liquid entrainment mixing, such as the mixing of wastewater and pharmaceuticals, and acid-base neutralization in chemical processes, thus having a wide range of applications. The addition of ejector holes to the nozzle creates a vacuum region inside the ejector hole due to the high-speed flow of the fluid, allowing fluid from outside the nozzle to enter the nozzle, increasing the mixing performance and creating premixing within the tube. Experiments have verified that this structure significantly increases the mixing performance of the two fluids, improves the uniformity of mixing, effectively avoids flame root quenching, and ensures stable combustion.

This invention relates to the field of underwater propulsion technology, specifically to an array-type disc-shaped underwater propulsion device based on piezoelectric drive, comprising: a shell, disc-shaped, with the axial direction of the shell pointing in the direction of propulsion; an inlet and a rear cover on the shell, the shell and the rear cover forming a receiving cavity; multiple piezoelectric drive units embedded within the shell, each piezoelectric drive unit's jet direction facing the rear of the propulsion device; and a hollow suction channel located within the receiving cavity and correspondingly positioned around each piezoelectric drive unit. The inlet of the suction channel connects to the inlet, and the outlet is arranged around the nozzle of the jet cavity, forming a local negative pressure suction zone. This design enables the propulsion device to provide partial thrust even during low-pressure fluid intake, further enhancing the propulsion performance.