1655results about "Jet pumps" patented technology

Assemblies and method to extract a material from a material source may include a vacuum and material collector assembly to enhance extraction of the material from the material source. The vacuum and material collector assembly may include a material collector comprising a high volume pressure vessel having an interior and a high-pressure vacuum source pneumatically coupled to the pressure vessel. The vacuum source is operable to generate a high-pressure vacuum of a fluid flow through the interior of the pressure vessel to extract the waste material from the waste material source into the interior of the pressure vessel. The vacuum source may be connected to the pressure vessel of the material collector to form a unified vacuum and material collector assembly which may be supported on a single mobile chassis.

Assemblies and method to extract a material from a material source may include a vacuum and material collector assembly to enhance extraction of the material from the material source. The vacuum and material collector assembly may include a material collector comprising a high volume pressure vessel having an interior and a high-pressure vacuum source pneumatically coupled to the pressure vessel. The vacuum source is operable to generate a high-pressure vacuum of a fluid flow through the interior of the pressure vessel to extract the waste material from the waste material source into the interior of the pressure vessel. The vacuum source may be connected to the pressure vessel of the material collector to form a unified vacuum and material collector assembly which may be supported on a single mobile chassis.

The invention relates to an attitude and orbit control engine high-altitude environment simulation ignition test system and a verification method, in particular to a high-altitude simulation test bed active injection verification system and a verification method, and solves the technical problems of high cost, high risk and low verification data validity during verification of a high-altitude simulation test bed in the prior art. The active injection verification system for the high-altitude simulation test bench comprises a vacuum chamber, a diffuser, a water spray cooler, a first corrugated pipe, a first gas collection chamber, a second corrugated pipe, n groups of coolers, a third corrugated pipe, a second gas collection chamber, a steam-jet pump, a pipeline and a data acquisition module, according to the verification method of the active ejection verification system of the high-altitude simulation test stand, ejection capacity verification is carried out in two stages, and the verification effectiveness is greatly improved on the premise that the verification cost is greatly reduced.

The invention discloses a porous ejector, a use method thereof and a fuel cell system, and belongs to the technical field of fuel cells. Comprising a shell, a cavity is formed in the shell, and the cavity comprises a suction cavity, a mixing chamber, a second flow stabilizing chamber and a diffusion section which are sequentially arranged; a nozzle body is mounted in the suction cavity and is used for accelerating and depressurizing the driving fluid and spraying the accelerated and depressurized driving fluid into the suction cavity to form a negative pressure area; an ejection opening is formed in the side wall, corresponding to the suction cavity, of the shell and used for introducing an ejection fluid, and the ejection fluid and the driving fluid subjected to acceleration and pressure reduction are mixed in the mixing chamber; a nozzle assembly is arranged at the end, close to the mixing chamber, of the nozzle body and comprises at least one nozzle, and driving fluid is accelerated through a hole channel of the nozzle. The invention provides a porous ejector, a use method thereof and a fuel cell system, and solves the technical problems of low fuel injection efficiency and insufficient energy utilization of a single-hole ejector used in a traditional hydrogen supply system.

The invention relates to the technical field of heat dissipation devices, in particular to a flow compensation drainage fan which comprises a fan body and a drainage device, and at least two jet flow holes are formed in the surface of the side, close to the drainage device, of the fan body; the drainage device is provided with an open drainage cavity which is defined by a top wall, a bottom wall and a side wall and enables airflow to be sprayed out in the set direction, the airflow generated by the fan body is sprayed out through the jet flow holes, surrounding air is entrained, and primary drainage is formed. The through-flow areas of the drainage channels are sequentially increased in the set direction, or the drainage holes are formed in the designated positions of the wall face of the drainage device, so that at least one time of secondary drainage can be generated when airflow flows in the open drainage cavity, and then the airflow finally sprayed out of the side wall flow outlet is substantially increased, so that the heat dissipation efficiency is improved.

The invention relates to a steam-jet pump system and a control method thereof, in particular to a variable-stage steam-jet pump system and a control method thereof, and solves the technical problems that an existing steam-jet pump system is difficult to realize switching of different working conditions and energy consumption is difficult to reduce. The variable-stage steam jet pump system comprises a gas collecting chamber and a gas jet pump unit connected with the gas collecting chamber, and the gas jet pump unit comprises a vacuum suction pipeline, a first-stage vacuum jet pump, a first-stage condenser, a second-stage vacuum jet pump, a second-stage condenser and a third-stage vacuum jet pump which are sequentially connected with the gas collecting chamber in the gas flow direction. The system further comprises a three-stage variable pump, a four-stage vacuum jet pump, a steam conveying unit and a cooling water conveying unit. The water supply reliability is greatly improved, and the long-time operation stability of the steam-jet pump system is guaranteed. According to the control method, ignition tests of engines with multiple thrust magnitudes and multiple working heights can be completed.

The invention discloses an integrated adjustable ejector for a vehicle-mounted hydrogen supply circulating system, which relates to the technical field of ejectors for vehicle-mounted hydrogen supply circulating systems and comprises a hydrogenation pipeline, a working pipeline and a circulating return pipeline. The circulating return pipeline comprises an integrated adjustable ejector, a hydrogen compressor, a steam-water separator, a circulating return pipeline one-way valve and a pressure reducing valve; the integrated adjustable ejector comprises a shell, a hydrogen inlet and outlet, a storage cavity, a valve, a control device, an execution controller and a monitoring and temperature control module. The integrated adjustable ejector is installed on the circulating backflow pipeline, the monitoring and temperature control module is integrated on the ejector, the hydrogen flow, pressure and temperature are monitored in real time, and the hydrogen temperature is adjusted so that stable operation can be achieved; the fuel cell reactor hydrogen flow sensor converts flow required by a fuel cell reactor into an electric signal, transmits the electric signal to the control device, and controls the execution controller to adjust the valve, so that dynamic optimization is realized, and various working condition requirements of a hydrogen fuel cell automobile are met.

The invention relates to an expanding drill device for expanding a pilot bore produced from a starting point to a target point in the ground along a specified drilling line by moving the expanding drill device (10) along the specified drilling line in order to produce a bore in the ground or in rock for introducing a pipeline or a supporting system into the expanded bore, comprising: a housing (11); a drill head (14) that has a cutting wheel (15) which is arranged on the drill side (21) of the expanding drill device (10) so as to be rotatably mounted and driven about a rotational axis and relative to the housing and on which at least one drill tool (16) for loosening the ground or the rock is arranged; and a drill-side connection for producing a connection to a pipe section located in the pilot bore on the drill side, wherein the drill side (21) centrally has at least one receiving chamber (24) for the loosened ground or the loosened rock, said receiving chamber being connected to a material conveyor device of the expanding drill device (10) for the loosened ground or the loosened rock via at least one removal opening (30); the drill side (21) has at least one drill chamber (38) that is equipped with the cutting wheel (15), which is arranged about the receiving chamber (24); the cutting wheel (15) has an annular design and is rotatably arranged about the central receiving chamber (24); and the receiving chamber (24) is connected to the drill chamber (38) via at least one conveyor opening (41) so that the loosened ground or the loosened rock can be conveyed into the receiving chamber (24) through the conveyor opening (41). According to the invention, at least one crusher (46) is provided in the drill chamber (38); the crusher (46) has crusher strips (49) on the rotatable cutting wheel (15) which move together with the cutting wheel (15) and crusher strips (47) on the receiving chamber (24) side facing the drill chamber (38) which are rigidly arranged together with the receiving chamber (24); and the crusher strips (47, 49) are arranged relative to one another such that a crusher gap (50) is produced between the crusher strips.

The invention relates to the technical field of heat dissipation devices, in particular to a multistage drainage fan which comprises a fan body and a drainage device, the drainage device comprises a drainage cavity defined by a top wall, a bottom wall and side walls connected between the top wall and the bottom wall, and second drainage channels in one-to-one correspondence with first drainage channels are distributed in the drainage cavity at intervals. According to the fan, jet flow generated by the jet flow hole of the fan body flows through the gap between the fan body and the drainage device and then enters the corresponding first drainage channel, gas in the peripheral direction of the area, opposite to the jet flow hole, in the gap is entrained, and primary drainage is formed; when the airflow flowing in from the first drainage channel flows through the second drainage channel, the airflow drags the air in the second drainage hole, so that at least one secondary drainage is generated, the airflow finally sprayed out from the side wall flow outlet is substantially increased, and the heat dissipation efficiency is improved.

The invention relates to the technical field of piezoelectric fans, in particular to a jet flow type miniature heat dissipation device which comprises an air inlet assembly and an air outlet assembly. The air inlet assembly comprises an air inlet plate, the air inlet plate is provided with fan blades and a vibration part attached to the fan blades and used for driving the fan blades to vibrate, and when the fan blades vibrate, external airflow is introduced and blown out in the direction away from the air inlet plate. The air outlet assembly comprises an air outlet layer attached to the air outlet side of the air inlet assembly and an air outlet plate attached to the air outlet layer. Wherein the air outlet layer is provided with a plurality of jet flow holes which are formed in the thickness direction in a penetrating mode, the air outlet plate is provided with air outlet channels corresponding to the jet flow holes, and the diameter d of the jet flow holes and the distance s between the jet flow holes meet the requirement that s / d is smaller than or equal to 5, so that airflow output from the jet flow holes is fused into a vortex ring in the air outlet channels and then discharged. The jet flow holes form a vortex ring structure and then are exhausted, the flow speed of gas is increased, the contact area of the gas and the gas outlet channel is increased, and the air outlet amount and the heat dissipation efficiency are improved.

The disclosure describes an expanding drill device for expanding a pilot bore by moving the expanding drill device along a specified drilling line comprising: a housing; a drill head that has a cutting wheel which is arranged on the drill side of the expanding drill device so as to be rotatably mounted and driven about a rotational axis and relative to the housing and on which at least one drill tool for loosening the ground or the rock is arranged; and a drill-side connection for producing a connection to a pipe section located in the pilot bore on the drill side, wherein the drill side centrally has at least one receiving chamber for the loosened ground or the loosened rock, said receiving chamber being connected to a material conveyor device of the expanding drill device.

A bleed system including a jet pump system configured to provide a supply gas comprising at least one of a higher pressure gas, a lower pressure gas, or a mixture of the higher pressure gas and the lower pressure gas. A needle body defines a throat region between a nozzle wall and the needle body. The needle body is configured to cause a gap between a rear needle surface of the needle body and the nozzle wall to decrease as the rear needle surface extends toward the throat region. The jet pump system is configured to discharge the higher pressure gas through the throat region and mix the higher pressure gas and the lower pressure gas in a mixing portion of an exhaust portion.

The invention discloses a compact type full-power coverage ejector structure, and relates to the technical field of ejector structures, the compact type full-power coverage ejector structure comprises a flow mixing cavity and a conveying cavity which are arranged in a communicating mode, and a nozzle used for conveying high-speed fluid is arranged at the end, away from the conveying cavity, of the flow mixing cavity; a secondary hydrogen flow inlet for conveying low-speed fluid is formed in the side wall of the mixed flow cavity; the nozzle comprises a conical section and a cylindrical section, wherein the conical section is close to the conveying cavity. According to the compact full-power coverage ejector structure, the nozzle, the partition plate, the needle valve and other structures are arranged, the opening degree of the nozzle is adjusted in real time through the pressure of high-speed fluid, accurate flow control within the full-power range is achieved, different load requirements of a fuel cell are met, and the flow rate is adjusted through the wide-range adjusting capacity of the nozzle. Full-power coverage from low load to full load is achieved, the problem that the efficiency of a traditional ejector is reduced when the load is low is solved, and the use efficiency of the compact full-power coverage ejector structure is improved.

The invention relates to the technical field of oil exploitation, in particular to a carbon dioxide drive shaft cold damage prevention device and a using method. According to the technical scheme, an oil pipe and a small-diameter oil pipe are connected with an anti-blocking jet flow drainage and production pump, the anti-blocking jet flow drainage and production pump is installed in the middle of an oil well, the lower end of the anti-blocking jet flow drainage and production pump is connected with an underground gas-liquid separator through the oil pipe, and the lower portion of the underground gas-liquid separator is connected with a fin type heat exchanger. The lower portion of the fin type heat exchanger is connected with a depressurization and degassing heat exchanger, and the depressurization and degassing heat exchanger is located below the oil layer. The device has the advantages that the cooling problem in an oil extraction production shaft caused by heat absorption in the carbon dioxide gasification process can be solved, the situation that a liquid flow channel is blocked due to wax precipitation and freezing of crude oil caused by cooling is avoided, and the corrosion problem of carbon dioxide to a pipe column can be greatly solved due to doping of power liquid; in addition, the anti-well-flushing wax dissolving and plug removal can be achieved, re-operation is avoided, and the operation cost is reduced.

The invention relates to the technical field of low-grade heat utilization, in particular to a jet boosting organic Rankine cycle combined cooling and power generation system and a jet boosting organic Rankine cycle combined cooling and power generation method. The system comprises a generator, a condenser, a working medium pump, a supersonic vapor-liquid two-phase flow ejector, a first evaporator, an expansion machine, a generator, a first throttling valve, a second evaporator, an absorber, a solution pump, a solution heat exchanger and a second throttling valve which are sequentially connected to form a loop. The organic Rankine cycle and the absorption refrigeration cycle are coupled to reduce the pressure of an outlet of an expansion machine, meanwhile, the supersonic vapor-liquid two-phase flow ejector is used for assisting in boosting to save part of consumed power of a power generation side working medium pump, and heat energy of part of superheated steam at an outlet of an absorption refrigeration subsystem generator is recycled; cogeneration is achieved while the heat efficiency is improved, and high technical economy is achieved.

The invention provides a steam ejector and an ejection method, and relates to the technical field of vacuum suction, the steam ejector comprises a negative suction pipeline, a steam ejection pipe is mounted on a square flange on the negative suction pipeline, a steam generation assembly is mounted at one end of the steam ejection pipe, and a noise elimination and speed reduction assembly is mounted at the other end of the steam ejection pipe; and the steam adjusting assembly is used for adjusting steam injected into the steam injection pipe. The technical problem that a steam ejector lacks a structure for reducing the temperature, flow velocity and noise of output steam is solved.

The embodiment of the invention discloses an ultrahigh compression ratio adjustable ejector and a variable working condition performance optimization design method thereof. The adjustable ejector comprises a nozzle, an adjusting cone, a suction chamber, a mixing chamber and a diffusion chamber, wherein working fluid is introduced into the nozzle, the adjusting cone is arranged at the throat part of the nozzle, and the fluid to be ejected is introduced into the suction chamber; the adjusting cone is formed by alternately and repeatedly connecting cylindrical surface sections and conical surface sections, and the adjusting cone can axially move; the method comprises the steps that the pressure of working fluid input into the adjustable ejector is monitored; when the pressure of the working fluid is changed between the first pressure and the second pressure, the adjusting cone is axially moved, and each cylindrical surface section directly faces the throat part in sequence, so that step type adjustment of the pressure of the working fluid is realized; when the pressure of the working fluid is changed between the second pressure and the fourth pressure, the adjusting cone is axially moved, and each conical surface section directly faces the throat part in sequence, so that the continuous adjustment of the pressure of the working fluid is realized; the mass flow of the ejected fluid in the adjustable ejector belongs to a preset range; the first pressure, the second pressure, the third pressure and the fourth pressure are gradually increased in sequence.

The invention relates to the technical field of server cooling, in particular to a server pneumatic vacuum circulation cooling device and a working method.The cold air injection conduction unit is provided with a cold air pipeline, a compressed air source is arranged at the head end of the cold air pipeline, and the tail end of the cold air pipeline is connected with a plurality of cold air injection heads which are located in a flow guide cover at the tail end of the cold air pipeline; the heating elements face the corresponding heating elements; compressed air within a set temperature range is transmitted into the cold air injection head through the cold air pipeline and used for injecting air for heat dissipation to the surface of the heating element, and the heating element is located in the secondary side space; the head end of the hot air pipeline faces the primary side space, the tail end of the hot air pipeline is connected with a hot air absorption head, and the hot air absorption head faces the heating element; and the hot gas absorbing head absorbs mixed gas overflowing from the hot gas radiating port by utilizing vacuum and discharges the mixed gas into the primary side space. The low-pressure state after heat dissipation is adapted through vacuum, and the requirements of the secondary side of the server for pressure balance, heat isolation and airflow directionality are met at the same time.

The invention relates to the technical field of tunnel equipment, and discloses a tunnel jet fan control method and system based on traffic flow and pollutant concentration, and the system comprises a data collection module, a data processing module, a control decision module, a jet fan control module and a jet fan frequency conversion controller which are in communication connection in sequence; the data acquisition module is used for acquiring traffic flow and pollutant concentration data; the data processing module is used for processing the traffic flow and pollutant concentration data to obtain processed data; the control decision module is used for generating a control instruction of the jet fan according to the processed data; the jet fan control module is used for converting the control instruction into a corresponding frequency control signal; and the jet fan frequency conversion controller is used for changing the power supply frequency of the jet fan motor according to the received frequency control signal so as to change the jet flow of the jet fan. According to the invention, the air quality in the tunnel can reach the standard, and the energy consumption can be effectively reduced.

The invention relates to the technical field of oil and gas field and coal bed gas field mining equipment, in particular to a wellhead suspension centrifugal pump drive double-pipe jet flow drainage and mining device and a using method. According to the technical scheme, a lower tubing head four-way joint, a middle tubing head four-way joint and an upper tubing head four-way joint are sequentially installed on a bottom flange, a motor is installed on the upper portion of the upper tubing head four-way joint, and an inner pipe plug-in pump core catcher is installed at the lower end of a submersible water injection centrifugal pump; the lower end of the inner pipe inserted pump core catcher is movably connected with an inner layer oil pipe, and a pump core installed in the double-pipe jet pump is arranged in a pump cylinder of the jet pump. The device has the advantages that due to the fact that a packer is omitted and the device is connected with the double-pipe jet pump, sand-containing liquid in a well can be sucked, and exploitation of natural gas or coal bed gas can be achieved; the inner pipe is inserted into an elastic clamping jaw of the pump core catcher to catch the pump core; and the submersible water injection centrifugal pump and the pump core can be lifted to the ground at one time by hoisting the motor at a ground wellhead, so that the maintenance is convenient.

The invention belongs to the technical field of jet-type hydraulic down-the-hole hammer drilling tools, and relates to an involution type jet-flow element which is formed by involution of a jet-flow element plate A and a jet-flow element plate B. The jet-flow element plate A and the jet-flow element plate B are of a mirror symmetry structure. And an input channel, a left signal channel, a left control channel, an upper cavity emptying channel, a right control channel, a right signal channel, an output channel, a lower cavity emptying channel, a main nozzle, a split wedge fixing screw hole, an involution plate fixing pin hole A and an involution plate fixing pin hole B. According to the invention, the processing difficulty is reduced, the processing period is shortened, the processing cost is reduced, and the production efficiency is improved. According to the flow channel with the small depth-to-width ratio, the stress of a stress concentration area is reduced, the jet element is promoted to adopt a hard alloy with a lower mark and higher erosion resistance, then the erosion resistance of the jet element is improved, the service life of the jet element is prolonged, the small-depth-to-width-ratio oppositely-combined jet element provides possibility for design and machining of the jet element with the ultra-large width-to-depth ratio, and the design cost is reduced. And enough strength redundancy is provided.

According to the bladeless fan, through the arrangement of an air channel straight pipe, an air channel bent pipe, a flow dividing pipe, a left nozzle assembly and a right nozzle assembly, when the bladeless fan works, air flow can be blown out from the left nozzle assembly and the right nozzle assembly on the two sides, and meanwhile the air channel straight pipe can rotate relative to a base; according to the bladeless fan, the flow dividing pipe can rotate by 360 degrees relative to the air duct bent pipe, so that the air blowing range of the left nozzle assembly and the right nozzle assembly can be adjusted, and therefore the rotating angle positions of the left nozzle assembly and the right nozzle assembly can be adjusted according to requirements, the air outlet range of the bladeless fan is effectively enlarged, and the service life of the bladeless fan is prolonged. The use requirements of a user are met; besides, through the arrangement of the noise reduction cover body, it can be ensured that noise generated by the fan motor assembly is blocked and reflected through the noise reduction channel when air enters to form airflow and the noise is spread outwards, the noise reduction and noise reduction effects are achieved, then the noise generated when the bladeless fan works is reduced, and the user experience is improved.

The present disclosure provides a fluid flow augmenting device to augment a fluid flow in any fluid circulation system without significant additional power consumption. The device includes an annular body extending along a longitudinal axis and defining an internal volume. The annular body includes a fluid inlet on one longitudinal end and a fluid outlet on another end and a first and second fluid directing structures. The first fluid directing structure receives a first fluid flow with a first fluid flow rate from a fluid source via the fluid inlet while the second fluid directing structure induces a second fluid flow with a second fluid flow rate from around the device to combine with the first fluid flow and generate an augmented fluid flow having an augmented fluid flow rate to be exhausted via the fluid outlet.

The invention relates to the technical field of heat dissipation devices, in particular to a side-spraying low-noise fan which comprises a fan body and a drainage device, a sinking groove is formed in the side, close to the fan body, of a top wall, a protruding part is formed in the sinking groove in a protruding mode, and high-speed airflow is sprayed out through jet flow holes, penetrates through a gap and then is sprayed into the drainage device through a first drainage channel; the flow of gas sprayed out of the flow outlet can be increased through high inertia, the heat dissipation efficiency is improved, high-speed gas flow can entrain gas in the peripheral direction of the area, opposite to the protruding part, of the jet flow hole in the gap, the sinking groove is formed in the peripheral direction of the protruding part, the through-flow area of a gas circulation channel adjacent to the peripheral direction of the area, opposite to the protruding part, of the jet flow hole is increased, and the flow resistance is reduced. And the peripheral gas can be rapidly and timely entrained and rapidly mixed with the high-speed gas jet flow to reduce the maximum speed of the jet flow center and reduce the speed distribution difference between the center and the edge of the gas flow, so that the purpose of suppressing noise is achieved.

The invention relates to the technical field of oil and gas field and coal bed gas field drainage and mining, in particular to a buoyancy lift pump core ring jet flow pump and a using method. According to the technical scheme, a low-density buoyancy lift pump core is installed in an inner cavity of a pump cylinder, an annular gap is formed between the low-density buoyancy lift pump core and the inner wall of the pump cylinder, a formation liquid suction inlet is formed in the lower side of the annular gap, an annular throat pipe is arranged below the formation liquid suction inlet, a diffusion cavity is formed below the annular throat pipe, and a pump core supporting seat is arranged at the bottom of the diffusion cavity; a mixed liquid outlet is formed in the lower side of the diffusion cavity, and the diffusion cavity is communicated with the mixed liquid discharge cavity. The low-density buoyancy lift pump core has the advantages that due to the fact that the overall density of the low-density buoyancy lift pump core is adjusted and reduced, the power hydraulic pressure and the using amount for pulling out the low-density buoyancy lift pump core can be reduced, and operation cost is reduced; in addition, the low-density buoyancy lift pump core is simple in structure, an annular jet flow structure is formed between the low-density buoyancy lift pump core and the pump cylinder, the liquid drainage and production amount is increased, the working condition of the low-density buoyancy lift pump core suitable for pumping media is wider, and the manufacturing cost is lower.

The invention relates to an electrohydrodynamic gas flow amplifier (1) for generating a gas flow, comprising a gas flow generator (4) and a gas flow accelerator (5), in which a first gas flow (2) can be generated by the gas flow generator (4) and guided to the gas flow accelerator (5). The gas flow accelerator (5) is configured to enable the second gas flow (3) to be accelerated by the first gas flow (2). The gas flow accelerator (5) is a Coanda gas flow accelerator and accelerates the second gas flow (3) from the gas flow generator (4) to the gas outlet (6) by means of the Coanda effect from the first gas flow (2). The invention further discloses a cleaning device for cleaning the medical instrument. The cleaning device comprises the electrohydrodynamic gas flow amplifier (1). A method of amplifying a gas using the electrohydrodynamic gas flow amplifier (1) is also disclosed. The invention also discloses a use of the electrohydrodynamic gas flow amplifier (1).

The present application discloses a full-operating-condition ejector, which relates to the technical field of ejectors, and includes a plurality of sub-ejectors arranged in parallel; the sub-ejector includes a nozzle front end tube, a nozzle inlet is provided on the nozzle front end tube, the nozzle inlet on the nozzle front end tube is connected to a high-pressure inlet, a low-pressure chamber is provided at one end of the nozzle front end tube, and a low-pressure inlet is provided on the low-pressure chamber; the nozzle is located in the low-pressure chamber, a mixing chamber connected to the low-pressure chamber is provided at one end of the nozzle, and a medium-pressure outlet is provided at one end of the mixing chamber; the regulating core is located in the mixing chamber, and the end of the regulating core close to the nozzle is conical; the other end of the nozzle front end tube is closed, and an actuator is provided at this end, and the actuator drives the regulating core to move axially through a valve stem, and the valve stem is connected to the regulating core. In this way, the problem of the decrease of the ejection ratio under the variable operating conditions of the traditional adjustable ejector is solved, and the area ratio is converted into a controllable favorable factor to achieve the regulation of the flow load under the full operating conditions.

The present invention provides a device for quickly eliminating instantaneous smoke and dust in underground blasting operation space of coal mines and a method for using the device. The device includes underground compressed air pipeline, negative pressure ejection device, multi-stage negative pressure dust suction device and high pressure wet spray device. First, high pressure gas enters the negative pressure ejection device, and a high negative pressure environment is formed in the negative pressure ejection chamber; the negative pressure power is used to roll up the smoke and dust through the multi-stage negative pressure dust suction device, and separation is implemented; the smoke after dust removal is mixed with high pressure gas and enters the high pressure wet spray device, and the toxic and harmful smoke is absorbed by the organic active agent, and the wet gas formed by the combination of clean gas and organic active agent is sprayed into the underground blasting operation space to implement further dust removal. The device in the present invention is small in size, easy to move, simple to operate, can realize industrialized production, and has strong on-site practicality; the present invention has the multi-stage linkage smoke and dust elimination functions of negative pressure absorbing dust, organic active agent dissolving smoke and high pressure humidification and dust reduction, high efficiency, good effect, and low cost and fast speed effective treatment.

The invention discloses an axial flow fan, an injection system and a range hood, and relates to the technical field of kitchen electric appliances. The axial flow fan comprises a rectification air duct and a movable blade assembly, and a noise reduction groove penetrating in the circumferential direction is formed in the inner wall of the rectification air duct; the movable blade assembly comprises a movable impeller, the movable impeller is rotationally arranged in the rectification air duct, the movable impeller comprises a plurality of movable blades arranged at intervals in the circumferential direction, and the blade tops of the movable blades are located in the noise reduction grooves. The axial flow fan can reduce noise and improve aerodynamic performance so as to improve user experience.