449 results about "Venturi effect" patented technology

The invention belongs to the technical field of wastewater treatment, and particularly relates to an efficient ozone micro-nano bubble preparation system and a process method thereof. The device further comprises an ozone preparing unit, a gas conveying pipeline, a jet flow unit, a spiral mixing unit, a Venturi tube, a microporous membrane unit and a reaction unit. The ozone producing unit is connected with the jet flow unit through a gas conveying pipeline, the ozone producing unit comprises an ozone generator, and the gas inlet pressure is regulated and controlled through a gas valve in the gas conveying pipeline; and the jet flow unit is used for generating and conveying a mixed solution with ozone microbubbles. The jet flow unit enables the mixed liquid to form ozone microbubbles based on a Venturi effect and a hydraulic shearing effect; by arranging the jet flow unit, the spiral mixing unit, the Venturi tube and the microporous membrane unit, ozone micro-nano bubbles with high concentration and uniform size distribution can be generated under relatively low energy consumption, so that the treatment efficiency of the ozone micro-nano bubbles in the technical fields of wastewater treatment and environmental protection is improved.

The mixing device comprises a powder hopper, a pre-mixing pipe, a high-pressure water pipe, a high-pressure pump, a machine body and a shearing emulsification pump, the powder hopper is connected with the pre-mixing pipe, the pre-mixing pipe is connected with the shearing emulsification pump, and the outlet side of the shearing emulsification pump is connected with a finished product output pipe; the water outlet end of the high-pressure water pipe is nested in the premixing pipe to form an annular powder channel, and the water inlet end of the high-pressure water pipe is connected with the high-pressure pump; a powder channel on-off mechanism is arranged outside the high-pressure water pipe; a kinetic energy collecting and stirring mechanism is arranged in the lower end of the high-pressure water pipe. The invention also comprises a mixing method of S1-S6. An annular powder channel is formed between the high-pressure water pipe and the pre-mixing pipe, dry powder can be annularly and uniformly distributed in the circumferential direction of the high-pressure water pipe through the annular powder channel, the dry powder is continuously and circumferentially sucked in through the Venturi effect generated when high-pressure water passes through the tail end of the high-pressure water pipe, the contact between the dry powder and water is larger, caking is more likely to be generated, and the dry powder is more stable. The online dry powder mixing device has a better online dry powder mixing effect.

The utility model provides a waterway switching valve with a foaming function, which comprises a switching valve main body, and the switching valve main body is provided with a water inlet, a water outlet, an air suction port and a liquid inlet. The periphery of the water outlet is coated with a water outlet channel, a gap is formed between the inner wall of the water outlet channel and the periphery of the water outlet, and the air suction hole and the liquid inlet are formed in the periphery of the water outlet channel and communicated with the gap. When water flows out of the switching valve body, due to the fact that a gap exists between the water outlet and the water outlet channel, negative pressure can be generated in the gap, the suction effect is achieved on the air suction port and the liquid inlet, and external air and foaming stock solution are sucked into the water outlet channel, mixed with water sprayed out of the water outlet and foamed. The foaming structure provided by the utility model utilizes the Venturi effect, is simple in overall structure and convenient to install, and in addition, the foaming structure is arranged at the water outlet, so that the length of a mixing cavity of foaming liquid, air and water is greatly increased, and the foaming effect is improved.

The invention provides a terminal security management system and management method, and relates to the technical field of security engineering. The terminal security management system comprises a hardware facility and a control end, the hardware facility comprises a control cabinet and a plurality of terminal devices installed in the control cabinet, the control cabinet is provided with an exhaust mechanism, the exhaust mechanism comprises an air outlet box, the two sides of the air outlet box are communicated with flow guide pieces, air channels are formed in the flow guide pieces, and the air channels are communicated with the air outlet box. The local part of the air channel is provided with a folding section, the inner side, facing the control cabinet, of the flow guide part is provided with a flow guide opening, and the flow guide opening is located between the two adjacent terminal devices; and an air inlet mechanism communicated with the flow guide part is arranged at the bottom in the control cabinet, a flow equalizing part is rotationally arranged in the air inlet mechanism, air is sucked from one side, facing the terminal equipment, of the flow guide part through a furling section on the air channel and a corresponding drainage opening by utilizing the Venturi effect, and heat energy at the position of the terminal equipment is dissipated.

Provided is the OFF-VENT breathing system. The system uses novel combinations of the venturi effect, PEEP adapters, HMEs, and the adaptation of a novel oxygen delivery system for the creation of high flow therapy to maintain open airways while maintaining access to the patient's airways for medical instruments, other accessories, or to assist breathing in general. The system is designed to create high flow oxygen therapy in a manner that does not require the use of ventilators, active heating humidifiers and other expensive equipment. Embodiments described include a novel integration of the venturi system into a nasal cannula apparatus, and the novel combination of the venturi effect and a PEEP adapter into breathing systems that might include hyperinflation and Mapleson circuits.

The invention discloses a hydraulic crusher transmission device for mining, and relates to the technical field of hydraulic transmission, the hydraulic crusher transmission device comprises a cylinder body and a hydraulic system arranged in the cylinder body and used for driving an oil cylinder rod to move, and further comprises a drill rod used for crushing ores, and a nitrogen chamber used for containing compressed nitrogen is formed in the top of an inner cavity groove; the cylinder body is provided with an auxiliary energy mechanism for adjusting the impact acting force of the drill rod on a mining face, the auxiliary energy mechanism comprises an axial position ring which is located in the inner cavity groove and is coaxial with the oil cylinder rod, the axial position ring is provided with a cylindrical cavity channel for oil liquid to circulate, and the cylinder body is provided with a pressure speed assembly for adjusting the flow speed in the cylindrical cavity channel to change the flow speed of the oil liquid in contact with the axial convex part; by arranging the auxiliary energy mechanism, the impact force on the mining face can be improved by changing the sectional dimension of the cylindrical cavity channel, utilizing the Venturi effect and increasing the oil flow speed according to the change of the rock hardness in the actual mining process, so that the purpose of dynamically adjusting the impact force of the drill rod on the mining face is achieved.

The utility model discloses a multi-layer flow channel necking-down type ball valve, relates to the technical field of ball valves, and solves the problems that high-pressure fluid scours a sealing surface and is cavitated due to the fact that a conventional flow channel outlet shape cannot effectively rectify and depressurize fluid. A sleeve is installed in the flow channel, the sleeve and the flow channel are coaxially arranged, the sleeve extends to the outlet position from the inlet position of the flow channel, and the sleeve is fixedly connected to the inner wall of the flow channel. The outlet position of the flow channel and the outlet of the sleeve are in a necking shape with the inner diameter gradually reduced. The sleeve divides the flow channel into multiple layers, layered flowing of fluid can be achieved, mutual interference among the fluid is reduced, the turbulent flow generation probability is reduced, and impact abrasion of the fluid to a sealing face is relieved. The necking shape accelerates the fluid through the Venturi effect, can rectify and depressurize the fluid, optimizes the flowing state of the fluid, balances the pressure of inner and outer flow channels of the sleeve and inhibits the cavitation phenomenon, the fluid impact is closer to the center of the flow channel, the turbulence intensity at an outlet is reduced, and the direct impact on the sealing surface of the valve seat is reduced.

The invention relates to a multi-mode precisely-regulated pelvic fumigation therapeutic apparatus and a using method thereof, and belongs to the technical field of pelvic fumigation therapies.The multi-mode precisely-regulated pelvic fumigation therapeutic apparatus comprises a therapeutic apparatus base, an antibacterial silica gel cushion, a multi-mode mist generating system, a control host, a handheld control terminal, a sewage collecting box and a storage battery; the therapeutic apparatus base is provided with a fumigation hopper. According to the invention, a sectional PID heating pipe is adopted to replace a traditional constant-temperature heating rod, and the stability of the mist temperature can be ensured by combining a temperature and pressure sensor, so that the scalding risk caused by temperature fluctuation of traditional equipment is solved, and an ultrasonic nano atomization technology is adopted, and the particle size is lt; compared with the prior art, the device has the advantages that the structure is simple, the size is small, the diameter is small, the diameter is 100 nm, the medicine transdermal absorption rate is increased to 82% from 42% of a traditional boiling method, the better treatment effect is achieved, the Venturi effect supercharging device is arranged to achieve the effect that the steam pressure is adjustable in the range of 0.05-0.3 MPa, the steering engine is arranged to adjust the spraying angle of the annular laying nozzle, and therefore the mist action range can be adjusted according to needs.

A hot tub wall jet nozzle includes a nozzle body and a nozzle core seat. Water flows from the water inlet into the water flow channel in the nozzle body. Air enters through the air inlet of the nozzle body and reaches the first air accommodating cavity, then flows from the first air accommodating cavity to the second air accommodating cavity, and the air from the second air accommodating cavity is then mixed with the water in the nozzle core seat at the water outlet under the Venturi effect, and the mixed water and air flow is finally discharged through the water outlet. This structural arrangement allows for reduced dilution and loss of air bubbles during water flow transmission. The Venturi effect produced in this nozzle is capable of generating a greater volume of air ejection, thus enhancing the strength and effectiveness of the massage.

The invention relates to the technical field of waste gas treatment, in particular to industrial production waste gas treatment equipment. Comprising an equipment frame; a bottom plate is fixedly mounted on the equipment frame, a U-shaped groove with a leftward opening is formed in the middle of the bottom plate, and a hydrolysis mechanism and a filtering mechanism are sequentially arranged on the bottom plate from left to right; according to the industrial production waste gas treatment equipment, impurity removal and hydrolysis are integrated on one equipment, so that the waste gas treatment cost is reduced, the hydrolysis mechanism enables water and waste gas to be completely mixed through the Venturi effect, harmful gas and impurities in the waste gas are removed, meanwhile, the waste gas can be cooled, and damage to the equipment is avoided; and then impurities in the water are filtered through the filtering mechanism, so that subsequent impurity cleaning is facilitated through the filtering mechanism.

Disclosed are an emulsification device and a beverage machine having the same. The emulsification device includes a Venturi structure and a switching apparatus. The Venturi structure includes a first mixing chamber and a second mixing chamber. In a case that a first steam channel is communicated with a steam source, steam flows through the first steam channel into the first mixing chamber to produce a mixed fluid with a first temperature based on a Venturi effect; and in a case that a second steam channel is communicated with the steam source, steam flows through the second steam channel into the second mixing chamber to produce a mixed fluid with a second temperature based on the Venturi effect, and the first temperature is not equal to the second temperature. Different types of beverages may be obtained by using milk foam with different temperatures.

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 invention relates to the technical field of building walls, in particular to a building wall damp-proof heat preservation structure which comprises a heat preservation base plate, a composite damp-proof layer, a ventilation interlayer, a vertical flow guide groove, a sealing connecting assembly, an elastic sealing ring, a waterproof clamping groove, a reflection heat insulation layer, a fireproof isolation layer and a leveling cavity. The composite damp-proof layer is tightly attached to the outer side of the heat preservation base plate and is formed by alternately stacking 3-5 layers of polyethylene hydrophobic films with nano-silicon dioxide coatings and microporous ePTFE breathable films according to the thickness ratio of 1: 2, dynamic balance of external prevention and internal permeation is formed, rainwater invasion is blocked, and dew formation and mildew caused by moisture accumulation in a wall are avoided. Furthermore, the change of the sectional area of the vertical flow guide groove of the outer ventilation interlayer generates a Venturi effect, and the technical effect of accelerating discharge of moisture in the wall body can be achieved, so that the phenomenon that the wall body falls off due to the fact that the wall body is in a high-humidity state for a long time is avoided.

The invention relates to the technical field of cable manufacturing, in particular to a high-distortion-resistance and high-temperature-resistance cable for wind power generation, which comprises a multi-layer anti-torsion conductor core, a dynamic compensation insulating layer, a three-dimensional braided shielding layer, a spiral heat dissipation channel layer and a sheath which are sequentially arranged from inside to outside, the multi-level anti-torsion conductor core adopts a tinned copper alloy conductor with a five-level stranded structure, the dynamic compensation insulating layer adopts a ceramic silicone rubber and polyolefin nano composite material, and the spiral heat dissipation channel layer is formed by spirally winding hollow metal wires. The defects in the prior art are overcome, the five-stage heterogeneous material twisting design is adopted, the internal stress counteracting effect is generated through the elasticity modulus difference of the materials, the ceramic silicone rubber forms a porous ceramic framework at the temperature of 300 DEG C, meanwhile, pores are filled with polyolefin melt, and the insulation resistance retention rate is larger than 95% after 200 times of thermal shock circulation; and a Venturi effect is formed between the hollow metal wire layers, so that the heat dissipation efficiency can be improved by utilizing external wind.

The invention belongs to the technical field of chemical engineering, and particularly relates to a reaction system for continuous photocatalytic synthesis of chloroethylene carbonate, the reaction system comprises a photocatalytic reactor, a gas-liquid separation mechanism, a mixer and a Venturi tube which are connected in sequence, and the Venturi tube comprises an inlet section, a contraction section, a throat and a diffusion section which are connected in sequence; a liquid inlet is formed in the upper part of the photocatalytic reactor; and one end, far away from the throat, of the diffusion section is connected with the liquid inlet. By additionally arranging the Venturi tube, the gas-liquid mixing effect can be improved by utilizing the Venturi effect, the reaction is promoted, the reaction is more sufficient, the reaction efficiency is improved, and the photocatalytic reactor, the gas-liquid separation mechanism, the mixer and the Venturi tube which are connected in sequence are arranged, so that the reaction efficiency is improved. And one end, far away from the throat, of the diffusion section of the Venturi tube is connected with the liquid inlet of the photocatalytic reactor, so that a closed-loop circulation system can be formed, the waste of raw materials is reduced, the stability and controllability of a reaction system are improved, and continuous production can be realized.

A fuel jettison system for the inflight discharge of fuel from an aircraft, and an aircraft having such a fuel jettison system. Using a venturi effect, the fuel jettison system facilitates the inflight discharge of fuel from the aircraft during an inflight fuel jettison operation at a higher velocity that mitigates the effects of turbulence to thereby mitigate an occurrence of fuel jettison impingement on aerodynamic surfaces of the aircraft.

The high-pressure cleaning machine comprises a shell and a plunger pump, the plunger pump is arranged on the shell, the high-pressure cleaning machine further comprises a Venturi tube, a siphon guide pipe and a flow adjusting device, a water channel, a cleaning liquid box and a mixing box are arranged on the shell, the two ends of the water channel are communicated with a water outlet of the plunger pump and the mixing box respectively, and the Venturi tube is installed and communicated in the water channel; the siphon guide pipe is installed on the shell, one end of the siphon guide pipe is installed and communicated with the throat portion of the Venturi tube, the other end of the siphon guide pipe is installed and communicated with the bottom of the cleaning liquid box, a first one-way valve is arranged in the siphon guide pipe, an impeller is rotationally connected into the mixing box, and the flow adjusting device is arranged on the siphon guide pipe and used for adjusting the suction amount of cleaning liquid. By means of the Venturi effect, when high-pressure water flow passes through the throat portion of the Venturi tube, the flow speed is increased, the pressure intensity is reduced, negative pressure is formed, the cleaning liquid is sucked into the water channel from the cleaning liquid box through the siphon guide pipe, automatic mixing of the cleaning liquid is achieved, the cleaning efficiency is improved, and the high-pressure cleaning machine is convenient to use.

Exhaust systems for gas turbine engines, gas turbine engines with the same, and methods of manufacturing, configuring, and operating a gas turbine engine with an exhaust system. The exhaust system can include an inlet, an outlet, a tubular section extending between the inlet and the outlet, and a nozzle that is positioned in the tubular section. The nozzle can discharge into the flow path to produce a pressure drop. The nozzle can be a Venturi-effect nozzle. The discharge from the nozzle can reduce a pressure generated by the turbine exhaust, and by association, increase the turbine's pressure ratio and power, which can be beneficial for different operational scenarios. The exhaust system may also include a tubular section with a linear design or a non-linear design. The tubular section of the exhaust system may include at least one section with a reduced diameter, e.g., downstream of the nozzle.

The present invention relates to the technical field of wood production wastewater treatment, and discloses a wood production wastewater treatment apparatus, which comprises a separation cylinder, and further comprises: a cleaning unit arranged in the separation cylinder and used for cleaning suspended solids in the separation cylinder; the primary filtering mechanism is arranged on one side of the separation cylinder and is used for primarily separating impurities in wastewater during wood production; the aeration mechanism is arranged at the bottom of the separation barrel and is used for aerating the primarily filtered wastewater. Through the synergistic effect of the primary filtering mechanism, the aeration mechanism and the gas dissolving mechanism, multi-stage treatment of wastewater is achieved, the primary filtering mechanism can preliminarily separate large-particle impurities in the wastewater, the aeration mechanism fills gas into the wastewater through the gas pump, mixing of the wastewater and the gas is promoted, grease and suspended particles in the wastewater are further removed, and the wastewater treatment effect is improved. And the gas dissolving mechanism further improves the content of gas in water by utilizing the Venturi effect, so that impurities in the wastewater are fully removed, and the treatment efficiency and quality are improved.

The invention relates to the technical field of industrial VOCs treatment, in particular to a multistage heat pump coupling microwave desorption system which comprises a microwave targeted preheating module, a heat pump gradient heating module, a low-pressure desorption environment construction module and a waste heat recovery network. The heating device is used for selectively heating a VOCs enrichment area; the heat pump gradient heating module adopts a multi-stage heat pump system, the adsorbent is heated to 130-160 DEG C from 70 DEG C in a gradient manner, and the heating rate is 8 DEG C / min; the low-pressure desorption environment construction module is used for designing a negative pressure pipeline based on the Venturi effect to form a-1.5 kPa desorption environment; and the waste heat recovery network comprises a plate heat exchanger and a heat pump evaporator and is used for realizing efficient recovery of desorption waste gas waste heat. The gradient activation composite zeolite rotating wheel and the AI dynamic regulation and control platform are matched, real-time optimization of microwave power, heat pump output and negative pressure parameters is achieved, and the device is suitable for treatment of high-concentration VOCs in the industries of coating, rubber, printing and the like.

A motionless pumping design that reduces operation and maintenance costs, and enhances reliability in three aspects of pneumatics system configuration. A motionless and corrosion-resistant pump which uses the continuous generation of pressure variation push / pull force by relying on the venturi effect induced by a pair of gas ejectors together with an argon pneumatic sub-system.

The embodiment of the invention discloses a thermal runaway management method and system.The thermal runaway management system comprises a venturi tube and an exhaust valve, the exhaust valve is arranged on the upstream of the venturi tube, the upstream of the venturi tube communicates with the interior of a battery pack, the downstream of the venturi tube communicates with the exterior of the battery pack, and the venturi tube and the active control exhaust valve work cooperatively; when thermal runaway is detected, the exhaust valve is quickly opened, high-temperature and high-pressure gas in the battery pack is efficiently exhausted by utilizing a Venturi tube effect, and meanwhile, a multi-sensor real-time monitoring and feedback mechanism is combined, so that the response speed and the exhaust efficiency of thermal runaway management are remarkably improved, and thermal runaway diffusion is effectively inhibited; the problems that a traditional pressure release valve is lagged in response and depends on internal pressure are solved, and meanwhile the problems that in a traditional scheme, a battery pack is low in exhaust efficiency, lack of effective cooling dilution and high in secondary combustion risk are solved.

A spray arm, a water pumping mechanism and a cleaning machine thereof are disclosed in the present invention. The spray arm comprises a body (1;1′) and a top plate (2;2′). An air collection chamber (20;20′) is defined between the top plate (2;2′) and the top surface (1a; 1a′) of the body (1;1′), a plurality of water spray holes (13) is arranged in the air collection chamber (20;20′), the top plate (2;2′) has a plurality of spray openings (21) each corresponding to one water spray hole (13), and a gap (100) is formed between a top end of each water spray hole (13) and a bottom end of the corresponding spray opening (21). According to the Venturi effect, the air in the air collection chamber can be sucked into the spout through the gap when the water flow passes through the water spray hole and is jetted out through the spray opening, such that bubbles are entrained in the jet flow; the bubbles are broken on surfaces of dishes or fruits and vegetables, which can improve dirt stripping force, and improve the washing effect.

The invention relates to the technical field of batteries, and particularly discloses a double-layer liquid cooling system and a battery pack. The double-layer liquid cooling system comprises a lower-layer liquid cooling plate, a water inlet and a water outlet of the lower-layer liquid cooling plate are each provided with a water drainage nozzle, and an internal water flow channel of each water drainage nozzle is of a Venturi structure. The water flow channel of the lower water inlet nozzle of the lower-layer liquid cooling plate is arranged to be of a Venturi structure, and the flow of cooling liquid flowing to the lower-layer liquid cooling plate is increased while the flow of cooling liquid flowing to the upper-layer liquid cooling plate is reduced by utilizing the Venturi effect, so that the pressure at the upper water inlet nozzle is reduced; therefore, the situation that throttling affects flow resistance of the whole package due to sudden change of the inner diameter of the upper water inlet nozzle can be avoided, and meanwhile the leakage risk at the upper water inlet nozzle can be reduced due to the fact that pressure at the upper water inlet nozzle is reduced. Meanwhile, the lower-layer liquid-cooling plate has increased cooling liquid flow rate, so that the time for filling the lower-layer liquid-cooling plate with the cooling liquid is shortened, the heat exchange coefficient of the lower-layer liquid-cooling plate is increased, and large temperature difference between the upper and lower-layer battery cells is avoided.

The fluid mixing gun and the steelmaking system are used for a steelmaking furnace and comprise a jet flow pipeline and a molten steel backflow pipe. And oxygen flow directionally circulates in the jet flow pipeline. A jet flow port is formed in the jet flow pipeline, a bearing space used for bearing molten steel is formed in the steel smelting furnace, and the jet flow port is communicated with the bearing space. An opening of the jet flow port faces the liquid level of the molten steel, and the oxygen flow is jetted to the liquid level of the molten steel. A negative pressure pipe section is arranged on the jet flow pipeline, a negative pressure flow channel is formed in the negative pressure pipe section, and the pipe diameter of the position of the negative pressure flow channel is smaller than that of other positions in the negative pressure pipe section. One end of the molten steel return pipe is connected to the negative pressure pipe section and is communicated with the negative pressure runner; and the other end of the molten steel return pipe is communicated with the bearing space. And when the oxygen flow flows through the negative pressure pipe section, a Venturi effect is generated, so that the molten steel is sucked into the molten steel return pipe from the molten steel return pipe and then flows back to the bearing space from the jet flow pipeline.

The invention relates to the field of atomizers, in particular to a flow-speed-adjustable airflow atomization device which comprises a machine shell, a speed reducing mechanism, a small air pump, a supporting hanging handle and a silica gel containing nozzle, and a Venturi hose, an abutting wheel, a guide strip, a guide block and a microswitch are arranged in the supporting hanging handle. A siphon capillary tube extending downwards to the bottom of the supporting hanging handle is formed on the neck portion of the Venturi hose, and a medicament bottle lifting tool and an extension steel needle are arranged at the bottom of the supporting hanging handle. Synchronous opening and closing of the air pump and the atomization channel are achieved through a single key, operation is greatly simplified, meanwhile, the atomization main pipeline is automatically closed when the atomization device is paused, pollutants are prevented from entering the atomization device, the siphon spraying atomization effect is enhanced through the Venturi effect, and the inhalation treatment effect is improved.

The invention relates to the technical field of rubber particle drying equipment, and discloses a high styrene rubber particle drying device based on pneumatic energy recovery. The device comprises an equipment bin, a fixing plate and a mounting plate are mounted at the end of the equipment bin, and a drying assembly, an air guide assembly and a driving assembly are arranged in the equipment bin. A drying cylinder in the drying assembly pushes materials through a threaded guide plate, when the drying cylinder rotates, a second driving gear on a fixing frame drives a second driven gear, and a centrifugal air guide impeller is driven through a transmission belt to suck water vapor in an equipment bin. Air flow is accelerated through the air guide nozzle with the Venturi effect and then guided into the sealing bin, the driven impeller is driven to rotate, and then automatic discharging of the material pushing plate is achieved. And meanwhile, after being dehumidified and cooled by the water absorption silica gel in the sealing bin, the water vapor cools the discharged materials through the discharge pipe. Pneumatic energy recovery and heat energy gradient utilization are achieved, the energy consumption is reduced, meanwhile, the drying efficiency is improved, and the beneficial effects of being integrated in structure and convenient and fast to maintain are achieved.

The invention discloses a dustproof and anti-poison series labor protection appliance, and particularly relates to a valve cavity isolation anti-return exhaust valve structure. The mask comprises a mask shell, a double-valve-box assembly, an inter-valve isolation cavity, a valve plate positioning nail, an outer valve plate, an outer sealing opening, an inner sealing opening, an inner valve plate, a filter box clamping position and an air filter box. The double-valve-box air exhaust valve is mainly characterized in that a traditional one-way air exhaust valve is replaced with a double-valve-box assembly, an inter-valve isolation cavity is formed between an outer valve plate and an inner valve plate, and dust is blocked through the Venturi effect and the trapping effect of a low-pressure vortex area; even if dust is clamped between the outer valve plate and the outer sealing opening, the dust can be removed during next expiration, and it is guaranteed that no dust is accumulated on the edge of the inner valve plate. The problems that an existing dustproof mask, an existing gas mask and an existing mask with a valve are not tightly closed, exhaust is not smooth, and closing of a valve plate is delayed due to the fact that dust is stuck to a sealing opening are solved, and the protection performance and the wearing comfort are improved.

The application provides an atomization assembly and an atomizer, and relates to the technical field of electronic atomization. The atomization assembly is internally formed with an atomization channel. The atomization channel comprises a first part, a second part and a third part. The first part and the third part are respectively arranged at two ends of the second part. The inner diameter of the first part and the third part is greater than the inner diameter of the second part. Due to the fact that the inner diameter of the first part and the third part of the atomization channel is greater than the inner diameter of the second part, the atomization channel is formed in a big-in-the-two-ends-and-small-in-the-middle shape. Based on the Venturi effect, when the atomization assembly is working or a user is inhaling, the gas flow rate in the second part reaches a maximum value, and the static pressure reaches a minimum value. As a result, a pressure difference is formed between the inside and the outside of the second part. Based on the pressure difference, the atomization assembly has a greater adsorption force on the atomization substrate, so that the atomization substrate is more quickly introduced, thereby ensuring the sufficiency of the atomization substrate and avoiding the occurrence of the paste core phenomenon. Meanwhile, a series of problems caused by the paste core are solved.

An example watercraft includes a hull that defines a cockpit. A scupper is provided that extends from the cockpit through an exterior surface of the hull. A recess defined by the hull is in communication with the scupper, and the recess defines a portion of a venturi tube. A plate that is attachable to the hull is configured to define another portion of the venturi tube such that when the plate is attached to the hull, a complete venturi tube is defined.