65 results about "Airflow orifice" patented technology

The present application relates to the technical fields of oil extraction safety valve, more particularly to a kind of underwater pressure balanced gate valve for deep-sea oil extraction operation, including gate valve body, the gate valve body includes valve body main body, fluid passage is arranged at the both ends of the valve body main body, fluid passage is arranged with valve plate moving cavity in the middle part, gate plate is installed in the inside of valve plate moving cavity, two air flow holes are arranged in the both sides of valve plate moving cavity, air flow hole is communicated with pressure chamber in the other end, air pressure plate is installed in the inside of pressure chamber;The present application is provided with sealing air bag, it is favorable when gate plate is closed, partial pressure groove negative pressure area disappears, triangular arc groove is preset with sealing air bag, and it is expanded under the action of pressure chamber high pressure, and it is formed dynamic sealing by being closely attached to gate plate;Meanwhile, through sealing air bag and crude oil self-lubricating effect, realize high sealing property and wear resistance under high pressure, it is suitable for deep-sea oil well wellhead valve and other high pressure working conditions, significantly improve the reliability and service life of valve under extreme environment.

The present application relates to an atomizer and an electronic atomization device. The atomizer comprises an oil cup and an atomization assembly, the atomization assembly comprises a bottom assembly, a top assembly mounted to the top end of the bottom assembly, and a heating assembly clamped and positioned between the bottom assembly and the top assembly, and is provided with an airflow channel penetrating through the top assembly and the heating assembly from top to bottom; the top assembly is mounted into the oil cup and is in sealing connection with the inner wall of the oil cup, the top assembly is provided with a liquid inlet channel for providing atomization liquid in the oil cup to the heating assembly, the heating assembly comprises an oil guide body and a heating body stacked together, the oil guide body is connected with the liquid inlet channel and has a first airflow hole forming part of the airflow channel, and the heating body is arranged on the side of the oil guide body away from the top assembly and bypasses the first airflow hole. The present application can reduce the generation of condensate, avoid the phenomenon of users inhaling condensate, and has fast oil supply speed and large atomization area, so as to provide users with better smoking experience.

The utility model relates to cloth chute technical field, the utility model provides a cloth chute of even unloading, it includes motor, fan blade and airflow hole. The utility model still includes transmission shaft, knock stick and push material board. In the utility model, through the mutual cooperation between the motor, fan blade and airflow hole etc. Component of even unloading mechanism, after fixing the chute through mounting plate, start motor, make its output shaft drive pivot rotation, further drive pulley no.

The utility model provides an air floating motion platform which comprises a base, a first driving part and air floating guide rails arranged at the two ends of the base in the first direction, a cross beam is arranged between the two air floating guide rails, the two ends of the cross beam are connected with air floating plates, and the first driving part drives the cross beam to move in the second direction. An opening is formed between at least one end, facing the cross beam, of the air floating guide rail and the base, the air floating plate is partially and movably arranged in the opening and faces the base, and airflow holes are formed in all surfaces of the air floating guide rail; air flow holes in the air floating plates generate air flow acting on the base and the air floating guide rails, generated upward air floating force and generated downward air floating force are matched with each other, air floating force generated by the two air floating plates in the first direction is matched with each other, the air floating plates are suspended above the base in the moving process of the cross beam, and the air floating plates do not make contact with the air floating guide rails. Friction among the air floating plate, the base and the air floating guide rail during moving is avoided, the air floating motion platform can be made to be light, and the motion speed and precision of the air floating motion platform can be improved.

The embodiment of the utility model provides a miniature vacuum air pump which comprises an air collecting and exhausting assembly provided with an exhaust port and a valve plate assembly arranged on the outer side of the exhaust port to control airflow exhausted from the exhaust port, and the valve plate assembly comprises a valve plate and an umbrella pin. The valve plate is provided with an airflow hole allowing airflow to pass through and an insertion hole used for installing the umbrella pin, and the umbrella pin comprises an umbrella rod correspondingly inserted into the insertion hole and an umbrella cover connected to the end, away from the exhaust port, of the umbrella rod and used for movably sealing the airflow hole. A plurality of annular protruding ribs surrounding the umbrella rod are further formed on the surface of the side, facing the valve plate, of the umbrella cover. According to the embodiment of the utility model, when the miniature vacuum air pump sucks air and the umbrella pins fall back to clap the plate surface of the valve plate, the umbrella pins are in contact with the plate surface of the valve plate through the annular convex ribs of the umbrella covers, and the contact surface of the umbrella pins and the plate surface of the valve plate is smaller, so that the noise generated by clapping the valve plate by the umbrella pins is smaller, and the working noise of the miniature vacuum air pump can be effectively reduced.

The present disclosure provides a smoking article comprising a combustible heat source, comprising: a first part containing a combustible heat source; a second part containing a tobacco material; an airflow hole extending to the upstream side of the combustible heat source from the downstream side end of the first part; and a buffer space located between the first part and the second part and connected to the airflow hole, wherein the airflow hole does not penetrate the combustible heat source. The smoking article has an effect of improving combustion persistency by using a combustible heat source to which an airflow hole is applied.

The application provides a cleaning device and a cleaning device assembly. The cleaning device comprises a housing, a side wall plate of the housing along a first direction is a bottom plate, the bottom plate is suitable for facing a surface to be cleaned, the bottom plate has spaced apart air inlets and air outlets; a walking device is installed in the housing and comprises a track, the track is arranged in the air outlet, the track has airflow holes penetrating through the track along the arrangement direction of the outer circumferential surface and the inner circumferential surface of the track; an air duct and a fan module are arranged in the housing, the fan module is used for driving fluid to enter the air duct from the air inlets; the air outlet of the air duct faces the track. In the cleaning device provided by the application, the problem of skidding of the cleaning device when walking can be at least avoided to some extent, the secondary pollution of the cleaned surface can be avoided, the self-cleaning ability of the cleaning device is improved, the cleaning efficiency of the cleaning device, the reliability of the product and the use experience of the user are improved.

The present application relates to the technical field of fabric drying and setting, and particularly relates to a fabric intelligent drying and setting device, which comprises a setting chamber through which a fabric to be treated is arranged, and further comprises: a suspension spreading unit installed in the setting chamber, wherein the suspension spreading unit comprises at least one group of hollow drying plate groups, each drying plate is provided with a flow guide slit, and a dynamic wave guide tensioning unit, wherein the dynamic wave guide tensioning unit comprises a group of oppositely arranged upper flow guide assemblies and lower flow guide assemblies, and each of the upper flow guide assemblies and the lower flow guide assemblies is provided with an airflow hole one; the fabric is transmitted through air cushion suspension, so that the damage of mechanical contact to fabric nap and microstructure is reduced; meanwhile, the wave-shaped pneumatic channel with dynamic adjustable wave amplitude is used to intelligently adjust the running tension without directly pulling the fabric, so that the instability and beating phenomenon of light and thin fabric in the airflow are effectively inhibited, and the stable and controllable conveying process is realized while the high quality of the fabric is ensured.

The utility model discloses a protective garment with a lens self-cleaning function, which belongs to the technical field of protective garments and comprises a protective garment body, a pair of goggles and a ventilation plug are arranged on the head of the protective garment body, a fixing frame is fixedly connected to the inner side of the goggles and located inside the protective garment body, and the ventilation plug is arranged in the protective garment body. An air bag strip is fixedly installed at the upper end of the inner wall of the fixing frame, and side grooves are formed in the inner walls of the two sides of the fixing frame. When a person wears the protective clothing for a period of time and the goggles are dirty, the person manually presses the forehead of the protective clothing, namely the upper end of the fixed frame, so that air in the air bag strip flows to the telescopic pipe through the air flow hole, the telescopic pipe extends under the stamping of air flow, and then the movable strip is driven to slide downwards along the two vertical rods; as the bottom end of the outer wall of the moving strip is provided with the extension piece, the moisturizing groove and the cleaning strip, the moving strip moves downwards along the inner wall of the goggles, and the effect that the cleaning strip cleans the inner wall of the goggles is achieved.

The utility model discloses a vibration disc with a convenient backflow structure. The vibration disc comprises a vibration source body, a feeding disc, a straight vibration track, a detection optical fiber sensor, a screening airflow hole, an extending backflow face and a guide groove. By means of the mode, the vibration disc with the convenient backflow structure achieves the effect of convenient backflow circulation of products rejected by a straight vibration rail through the arrangement of the extending backflow face, effectively simplifies the structure of the vibration disc, saves research and development and manufacturing cost, does not need manual debugging and maintenance, is simple and reliable in butt joint, and improves the working efficiency. The use safety is improved, the energy consumption of the equipment is greatly reduced, and the equipment is more energy-saving and environment-friendly.

The present invention provides a smoking article comprising a combustible heat source, comprising: a first portion comprising a combustible heat source, a second portion comprising a smoking material, an airflow aperture extending from a downstream end of the first portion to an upstream end of the combustible heat source, and a buffer space located between the first portion and the second portion and connected to the airflow aperture; the airflow aperture not extending through the combustible heat source, the smoking article having the effect of increasing the burn duration by using a combustible heat source comprising an airflow aperture.

A therapy light comprises a housing and a circuit board mounted within the housing and having light emitting diodes mounted thereon. Airflow apertures in the circuit board are disposed adjacent the light emitting diodes such that the front face and the back face of the circuit board are in airflow communication one with the other. The ratio of the cumulative cross-sectional area of the airflow apertures to the cumulative cross-sectional area of the light emitting diodes is greater than about 3:2. In use, a fan causes air to flow into an intake ventilation opening, from the intake ventilation opening to the circuit board, through the airflow apertures in the circuit board, and out of an exhaust ventilation opening, to thereby cool the light emitting diodes.

The application relates to a mobile descaling device which comprises a vehicle body, a liquid storage tank and a gas charging and discharging assembly. The liquid storage tank is used for storing cleaning liquid and is connected with the vehicle body. Air flow holes and water flow holes are arranged on the surface of the liquid storage tank and oppositely arranged on the two sides of the liquid storage tank, wherein the air flow holes are arranged on the upper surface of the liquid storage tank. The gas charging and discharging assembly is communicated with the inside of the liquid storage tank through the air flow holes and is used for charging and discharging the liquid storage tank through the air flow holes. When the gas charging and discharging assembly charges the liquid storage tank, the cleaning liquid in the liquid storage tank is discharged from the liquid storage tank through the water flow holes under the action of air pressure. When the gas charging and discharging assembly discharges the liquid storage tank, negative pressure is formed in the liquid storage tank to suck the cleaning liquid into the liquid storage tank through the water flow holes. The gas charging and discharging assembly is used for charging and discharging the liquid storage tank, the transfer of the cleaning liquid is realized, the operation is simple and convenient, the cleaning liquid enters the liquid storage tank through the water flow holes, the cleaning liquid cannot directly contact the gas charging and discharging assembly, and the service life is effectively prolonged.

The utility model relates to the technical field of machine tool dust prevention, in particular to an air curtain dust prevention device for a machine tool spindle, and aims to overcome the defect that the machining quality and the service life of the machine tool spindle are affected due to the fact that the machine tool spindle is inconvenient to cool in the prior art. A plurality of airflow holes are formed in the air curtain annular body; the collecting box is fixedly installed on one side of the air curtain annular body, a feeding opening is fixedly formed in the top of the collecting box, a collecting cover is fixedly installed on one side of the collecting box, a collecting opening is formed in the top of the collecting cover, and the same collecting pipe is fixedly installed on the feeding opening and the collecting opening; a first through hole is formed in the other side of the collecting box; according to the cooling device for the machine tool spindle, the machine tool spindle can be cooled conveniently, so that the machining quality can be improved, and the service life of the machine tool spindle can be prolonged.

The application belongs to the technical field of cigarette processing, and particularly relates to a tobacco tow spreading device, which comprises a first-level spreading mechanism and a first-level spreading assembly. The first-level spreading assembly comprises a first clamping plate and a second clamping plate which are fixedly connected. Opposite end faces of the first clamping plate and the second clamping plate are provided with trapezoidal grooves and triangular grooves. The trapezoidal grooves are connected with the two triangular grooves through arc grooves. After the first clamping plate and the second clamping plate are clamped, the trapezoidal grooves of the first clamping plate and the second clamping plate jointly form a tow channel with a narrow lower end and a wide upper end. The triangular grooves of the first clamping plate and the second clamping plate jointly form two negative pressure chambers. The arc grooves of the first clamping plate and the second clamping plate jointly form airflow holes which are connected with the tow channel and the negative pressure chambers. A positive pressure chamber is arranged in the first clamping plate and the second clamping plate. The positive pressure chamber is connected with the trapezoidal grooves through downwardly inclined air inlet holes. The first-level spreading mechanism can realize posture stabilization of sheet-shaped tow and comprehensive spreading in the state.

The utility model relates to the technical field of elevator cars, and discloses an elevator car ventilation adjusting structure which comprises an elevator car body, the top of the elevator car body is in threaded connection with a filter box, a sliding groove is formed in the filter box, and the interior of the sliding groove is in sliding connection with a filter mechanism. The top of the filter box is fixedly connected with a ventilation opening, and a ventilation fan is installed in the ventilation opening. According to the ventilation adjusting structure of the elevator car, through the arrangement of the adjusting mechanism, when the air speed in the ventilation opening is adjusted, a driving motor in a motor box is started, the driving motor drives a rotating disc on a top rotating rod to rotate on the surface of a fixed disc, and circulating holes formed in the surfaces of the rotating disc and the fixed disc are staggered; and therefore, the effect of adjusting the air speed in the ventilation opening is achieved, adjustment can be carried out according to the actual situation, and the flexibility of equipment is improved.

The invention relates to a clamping protection device for welding a battery cover plate in the technical field of battery production. The clamping protection device comprises a dust hood, a support frame, a pressure head assembly and a bottom support assembly, the supporting frame comprises a back plate, the bottom support assembly comprises a bottom supporting plate and a pre-pulling plate, the back plate is provided with a sliding block guide rail pair capable of enabling the bottom supporting plate and the pre-pulling plate to synchronously and vertically move, and a spring is connected between the pre-pulling plate and the upper end of the back plate face of the back plate. A positioning groove is formed in the upper plate face of the bottom supporting plate, the pressing head assembly is erected above the bottom supporting plate and comprises a pressing plate and a flow guide cover plate, the pressing plate is provided with a limiting groove, a light-transmitting notch hole is formed in the groove bottom of the limiting groove, a round hole is formed in the plate face of the flow guide cover plate, an annular groove channel is formed in the hole wall of the round hole, and a plurality of airflow holes are rotationally and symmetrically formed in the outer side wall of the flow guide cover plate. A negative pressure pipe is arranged on the side wall of the sleeve; the clamping protection device can improve the clamping and welding efficiency and safety and ensure the production quality.

The utility model relates to the technical field of binding devices, in particular to a financial bill binding device which comprises binding control equipment and an electric hydraulic rod, the bottom end of the electric hydraulic rod is fixedly connected with a fixing transverse plate, the bottom end of the fixing transverse plate is fixedly connected with a punching extrusion assembly and a pressurizing limiting assembly, and the punching extrusion assembly comprises a punching head. The punching head is embedded in the sleeve hole, the sleeve hole is formed in the inner side of the pressing plate, the top end of the pressing plate is fixedly connected with a double-column rod, the outer side, close to the upper end, of the double-column rod is fixedly connected with a sealing ring, the pressurization limiting assembly comprises a gas storage shell, a gas storage groove is formed in the inner side of the gas storage shell, and an airflow hole is formed in the inner side of the gas storage shell; according to the device, indentation and grain expansion caused by punching extrusion are effectively prevented, it is ensured that paper is flat, the appearance quality of bills is improved, and consulting and long-term storage are facilitated.

The converter comprises a rotating mechanism, a converter clamping claw, the converter, a lifting mechanism and an oxygen lance, and further comprises a preheating mechanism, the preheating mechanism further comprises a preheating shell, a preheating layer used for containing waste steel is fixedly connected to the interior of the preheating shell, and the preheating layer is fixedly connected to the interior of the preheating shell. Air holes used for containing slag are formed in the bottom of the preheating layer and the bottom of the preheating shell, and airflow holes facilitating preheating of waste steel through flue gas are formed in the preheating layer; waste steel is effectively preheated through the preheating mechanism, the problem that the temperature of molten steel is insufficient due to the fact that the waste steel absorbs heat under the low molten iron ratio is solved, the preheating layer of the preheating mechanism makes full contact with the waste steel through the airflow holes by means of high-temperature flue gas generated by the converter, the waste steel is preheated, and the molten steel heat absorbed after the waste steel is added into the converter is reduced; and the temperature condition required by steelmaking in the low molten iron ratio environment is guaranteed, and the situation that the steelmaking efficiency and quality are reduced due to insufficient temperature is avoided.

This invention discloses a swirl-type combustion torch for combustible waste gas combustion treatment, comprising a torch tube, a swirl-generating cylinder rotatably fitted inside the torch tube, and a burner installed inside the swirl-generating cylinder. The swirl-generating cylinder has multiple airflow holes on its side wall, and multiple swirl blades are circumferentially arranged inside the swirl-generating cylinder and above the burner. During combustion, the hot airflow in this torch drives the swirl-generating cylinder to rotate through the swirl blades, forming a swirl, accelerating airflow, and ensuring thorough mixing with the waste gas, thereby improving the completeness of waste gas combustion.

This application discloses a directional conveying device for radishes, relating to the field of agricultural product transportation technology. It includes a conveyor plate, moving wheels, and a storage box, as well as a guide plate, an elastic plate, and several cylindrical bladders. An air passage is formed between the elastic plate and the inner bottom wall of the storage box. Several cylindrical bladders are installed inside the storage box. Each cylindrical bladder is hollow, and several air holes are provided on its sidewalls. The elastic plate has several airflow holes, the number of which is the same as the number of cylindrical bladders. The cylindrical bladders are interconnected with the air passage through the airflow holes. When the elastic plate moves up and down, it can cause the cylindrical bladders to deform. Cooling airflow is directly delivered to the center of the pile, overcoming the shortcomings of existing technologies where airflow can only penetrate upwards from the bottom gaps but cannot reach the hot core due to the dense pile. This effectively controls the center temperature and significantly reduces spoilage caused by the accumulation of respiration heat.

The application discloses a kind of orifice plate flow coefficient and cold efficiency universal measurement test device of variable incoming flow, the test device includes cold side channel component, hot side channel component and orifice plate, the cold side channel component is detachably connected with hot side channel component, the orifice plate is clamped between cold side channel component and hot side channel component, the cold side channel component and hot side channel component are communicated by the air flow hole of orifice plate;Annular array distribution is provided on the cold side channel component and hot side channel component and is installed hole, and the installed hole of cold side channel component and hot side channel component are one-to-one correspondence.This application can measure flow coefficient and cooling efficiency on the same test device, and when the influence of primary and secondary flow direction on flow coefficient and cooling efficiency is studied, the angle of cold side channel component and hot side channel component is adjusted, the change of primary and secondary flow incoming flow direction angle is realized, the type of orifice plate and test time are reduced, and test cost is reduced.

The utility model discloses a kind of spray gun spraying gas shunt mechanism, including shunt cavity, shunt ring, shunt cavity includes end face, end face outer periphery is protruded with a circle of side plate to the side of spray gun head, end face middle part is protruded with a circle of inner plate to the side of spray gun head, main gas flow hole, atomization gas flow hole are set in end face, the inner periphery of shunt ring and / or outer periphery is evenly provided with several centering teeth, to cooperate with inner plate and / or side plate, so that shunt ring is coaxially arranged with shunt cavity.The utility model's main gas flow hole, atomization gas flow hole are staggered and arranged in the inner and outer circle of end face, gas path of main gas flow hole, atomization gas flow hole is separated by shunt ring, since the mating surface of shunt ring and end face is annular, when assembling shunt ring, it is not necessary to rotate and adjust the assembly angle of shunt ring and shunt cavity, shunt ring can be installed at any angle, assembly process is convenient and fast, and positioning pin structure is saved, reduce the probability of damage in shunt ring assembly process.

The invention relates to the technical field of fruit and vegetable precooling, in particular to a fruit and vegetable precooling device based on airflow adjustment. Comprising a box; a bearing mechanism and an air supply system are arranged in the box body; the multi-layer snakelike conveying part and the matched lifting part are arranged in the box body, so that the carriers can be automatically and orderly transferred among all layers and fill the space of the box body, and meanwhile, through a three-dimensional air supply system formed by the hollow plate, the air box and the air flow holes in the wall of the box body, the air supply efficiency is improved. Multi-angle and dead-corner-free forced convection cooling is carried out on a carrier in a moving state, the design breaks through obstruction of static stacking to airflow, continuity and automation of cooling operation are achieved, and the problems that in a traditional mode, due to dense stacking, cooling is uneven, operation efficiency is interrupted, and the airflow effect is limited are solved. And the uniformity, the efficiency and the automation level of pre-cooling treatment are obviously improved.

This application discloses a novel elastomer spraying head, relating to the field of elastomer product processing technology, used for injecting material into a mold cavity. It includes a nozzle, a nozzle valve body, and a stirring valve body. The nozzle comprises a nozzle body and a nozzle core, with the nozzle core installed within the nozzle body. The nozzle valve body and the stirring valve body are both installed at the tail end of the nozzle valve body. The nozzle valve body has a first air pressure inlet connected to multiple airflow channels in the nozzle core, which in turn connect to the air jet outlet of the nozzle body. The nozzle core has a discharge head at its head, located within the air jet outlet, with a gap between the outer wall of the discharge head and the inner wall of the air jet outlet. This application enables the elastomer material to be atomized and fully contacted with the inner wall of the mold cavity, avoiding bubble formation and resulting in a more defined angular shape of the molded product, thus fully meeting the processing requirements of complex products with sharp edges.

The glasses frame assembly comprises a glasses frame and a pair of glasses legs installed on the two sides of the glasses frame, and each glasses leg is provided with an installation cavity used for containing a circuit assembly of the AR glasses and a first airflow hole and a second airflow hole which communicate with the installation cavity and are formed in the upper side wall and the lower side wall of the corresponding glasses leg respectively. The first airflow hole and the second airflow hole are located above and below the circuit assembly respectively; a plurality of first airflow holes located over a main chip of the circuit assembly meet the condition that d1 / x1 is larger than or equal to 0.1 and smaller than or equal to 2.0, d1 is the hole diameter of the first airflow holes, x1 is the hole distance between the current first airflow hole and the adjacent first airflow hole, a plurality of second airflow holes located under the main chip meet the condition that d2 / x2 is larger than or equal to 0.1 and smaller than or equal to 2.0, d2 is the hole diameter of the current second airflow hole, and x2 is the hole distance between the current second airflow hole and the adjacent first airflow hole. And x2 is the hole distance between the current second airflow hole and the adjacent second airflow hole, so that the heat dissipation effect of the main chip and the rigidity of the glasses legs are both considered.

The utility model relates to the technical field of blanking device, concretely to a non -injury type shaping hopper, including feed hopper, including the connecting portion of conical body and the conical body below, the conical body includes the inclined feed port of being located at the top, the discharge port of being located at the bottom and the detection port of being located on the side wall, airflow board, plug -in and install in the inner chamber of feed hopper, and airflow board is installed close to the higher side of inclined feed port, and airflow board is equipped with a plurality of airflow holes, the airflow room is formed between airflow board in the inner chamber of feed hopper, and the airflow room top is equipped with the apron, and the apron is equipped with the air inlet, detection device, detection device is located on the detection port, shaping part, shaping part is detachable with the connecting portion connection, vibrator, vibrator device is on shaping part. Ensure the integrity of PPE pillow type bag under the premise of successfully shaping PPE pillow type bag, avoid because the shell breakage after the inside loading solid or powder leak, block the hopper and cause the follow -up blanking not smooth, guarantee production progress normal, improve production efficiency.

The utility model relates to the field of airflow sensor manufacturing, and provides an airflow sensor and an electronic atomizer with the same. According to the airflow sensor, an MEMS chip and an ASIC chip are integrated on the same circuit board and are packaged by a device shell to form a compact sensing unit. The periphery of the circuit board is covered with the protective shell, and the protective shell and the circuit board form a protective cavity through the supporting ring, so that the sensing unit is shielded and supported. And the protective shell, the device shell and the circuit board are provided with multi-stage airflow holes for guiding airflow. The technology of MEMS, interconnection packaging, multi-stage protection and the like is comprehensively utilized, the integration level and reliability of the airflow sensor are greatly improved, the manufacturing process is simplified, the cost is reduced, meanwhile, intelligent control over the atomization process is achieved through application in an electronic atomizer, and a new application scene is developed for intelligent health electronic products.

The application provides an adjustable flow oxygen output device, which comprises a first part and a second part arranged coaxially and capable of relative rotation; the first part is provided with an air outlet and a plurality of first air flow holes, and the air outlet is connected with a breathing mask; the second part is provided with an air inlet and a plurality of second air flow holes, and the air inlet is connected with an air outlet of an oxygen cylinder; the first air flow hole and the second air flow hole are arranged in axial opposition, and the air inlet, the second air flow hole, the first air flow hole and the air outlet are sequentially communicated to form an air flow path; the rotation of the second part relative to the first part changes the relative position of the first air flow hole and the second air flow hole in the circumferential direction, so as to adjust the oxygen flow through the air flow path. Through the relative rotation of the first part and the second part, the relative position of the first air flow hole and the second air flow hole in the circumferential direction is changed, the adjustment of the oxygen flow is realized, and the problem of strong oxygen flow impact force in the initial stage is relieved.

The graphite powder purification tool comprises a crucible, a gas distribution disc and a limiting structure, the lower portion of a crucible cavity of the crucible is a reaction area, the upper portion of the crucible cavity of the crucible is a settlement area with the large inner diameter, the top of the crucible is provided with a crucible cover with a gas outlet hole, the bottom of the crucible is provided with a bottom plate with a gas inlet hole, and the gas distribution disc is arranged in the crucible cavity in a sealed mode and is close to the bottom plate. A preset gas distribution gap is kept between the gas distribution disc and the bottom plate, a plurality of gas distribution holes are evenly formed in the gas distribution disc, a gas cap is installed at each gas distribution hole, a gas flow hole is formed in the circumferential side wall of each gas cap, the limiting structure is used for limiting the gas caps, and when gas enters the gas inlet holes, gas sequentially passes through the gas distribution gaps and the gas distribution holes to eject the gas caps away from the gas distribution holes. Gas flows into the crucible cavity from the gas flow hole, when gas does not enter the gas inlet hole, the gas cap automatically falls under the action of self weight to block the gas distribution hole, and the gas flow hole is blocked by the limiting structure. According to the graphite powder purification tool, graphite powder can be evenly dispersed through airflow, full contact is achieved for reaction, and the purification effect is good.