272results about How to "Avoid turbulence" patented technology

The invention discloses an underwater thruster permanent magnet propeller capable of reducing cavitation noise, and relates to the technical field of propellers, the underwater thruster permanent magnet propeller comprises a mounting plate, a propeller body and a fairing; mounting holes are formed in the mounting plate, the mounting plate is fixedly mounted on the underwater propeller through matching of bolts and the mounting holes, a main shaft is rotationally connected to the middle of one end face of the mounting plate, the fairing is fixedly connected to one end face of the mounting plate, and the propeller body is fixedly mounted at the end, away from the mounting plate, of the main shaft. The vibration reeds are installed on the inner wall of the flow guide cover, the vibration reeds can vibrate at a high speed through vortexes generated by the cavitation bubbles, and therefore the cavitation bubbles large in size are scattered into a larger number of small cavitation bubbles, the noise decibel generated by the larger number of small cavitation bubbles is lower than the noise decibel generated by the large cavitation bubbles when the larger number of small cavitation bubbles are broken, and the frequency is higher than the noise decibel generated by the large cavitation bubbles when the larger number of small cavitation bubbles are broken. Due to the fact that the wavelength of the high-frequency noise is short, the high-frequency noise is easy to absorb and scatter, one part of the high-frequency noise is directly absorbed by the flow guide cover, and the underwater environment can restrain propagation of the high-frequency noise.

The flow stabilizing device comprises a feeding pipe, a vertical discharging pipe, a reverse feeding barrel and a guide plate, the upper end and the lower end of the discharging pipe are each of an opening structure, and the barrel wall of the reverse feeding barrel is arranged on the outer side of the discharging pipe; the lower end of the barrel wall is connected with the pipe wall of the discharging pipe in a watertight mode through the barrel bottom, the upper end of the barrel wall is higher than the upper end of the discharging pipe, and a feeding port communicated with the feeding pipe is formed in the lower portion of the barrel wall. And the guide plate is wound between the pipe wall of the blanking pipe and the barrel wall of the reverse feeding barrel in a spiral ascending manner. The flow stabilizing device provided by the utility model can effectively stabilize the flow of the ore pulp before the ore pulp enters the concentration tank of the concentration system, so that the ore pulp can be sufficiently flocculated, and the concentration effect is remarkably improved.

The invention provides a pickling wastewater circulation treatment device which comprises a sedimentation tank, a plurality of threaded cylinders are fixedly arranged at the bottom of a water distribution pipe, threads are arranged on the inner side of each threaded cylinder, the threaded cylinders are in threaded connection with a plurality of spiral water pipes, an auxiliary sedimentation mechanism is further arranged in the water distribution pipe, and the auxiliary sedimentation mechanism is in threaded connection with the spiral water pipes. The invention relates to the technical field of pickling wastewater treatment, a water distribution pipe, a spiral water pipe and a buffer plate are arranged on a water inlet pipeline, so that the flow rate of wastewater entering the sedimentation tank is greatly reduced, and the flow rate of the wastewater entering the sedimentation tank is greatly reduced; therefore, the phenomena of short flow and turbulent flow caused by non-uniform water flow distribution are effectively avoided, sufficient retention time of wastewater in the sedimentation tank is ensured, and the sedimentation efficiency of suspended matters is improved; and secondly, a synchronous dosing assembly is arranged on the water distribution pipe, so that when the wastewater is discharged into the sedimentation tank, a flocculating agent can be fully mixed with the wastewater, and the flocculation effect of suspended solids is promoted.

The invention provides an injection mold convenient to demold, and belongs to the technical field of injection molds, the injection mold convenient to demold comprises a fixed mold base, a movable mold base and a mounting plate mounted at the bottom of the fixed mold base, and further comprises a gradient cooling assembly and a magnetic sealing assembly; according to the mold, the gradient cooling assembly and the magnetic sealing assembly are integrated, a stepped cooling environment is created at the fixed mold core and the movable mold core, the cooling requirements of different parts of an injection molding part are met, and the quality of the injection molding part is improved; when the mold is not closed, the liquid guide pipe is tightly sealed by the ball plug, so that external dust or water vapor is effectively prevented from entering the mold, and meanwhile, a stepped cooling environment is favorably created; the magnetic sealing assembly can achieve dynamic sealing between the liquid guide pipe and the liquid guide opening in the mold closing and separating process of the mold, and when the mold is closed, cooling liquid is prevented from flowing through a gap; and when the mold is separated, the air bag is gradually deflated and is recovered to an unsaturated state, so that the liquid guide pipe can be conveniently drawn out, the friction force is reduced, and the wear degree of the air bag is reduced.

The utility model discloses a transmission device, a driving device and a vehicle, the transmission device comprises a transmission mechanism and a shell, a first partition plate is arranged in the shell, the shell is divided into a first cavity and a second cavity by the first partition plate, the transmission mechanism is arranged in the first cavity and the second cavity, and the transmission mechanism is arranged in the second cavity. The first cavity and the second cavity are used for containing a liquid medium, and a first hole allowing the liquid medium to circulate is formed in the first partition plate. Therefore, the liquid level in the first cavity and the liquid level in the second cavity are balanced through the first hole, so that insufficient lubrication or cooling of a transmission mechanism caused by large-area accumulation of a liquid medium on one side during dynamic operation of the transmission device is avoided.

The utility model relates to an electromagnetic water tunnel device, which belongs to the field of hydrodynamic experiments and comprises a base, two electrode plates, a magnetic part and an ion supplement device. Wherein a water channel is formed in the base, and water flows in the water channel; one section of the water channel is a power section; the two electrode plates are respectively positioned on two side walls of the power section; an electric field is formed between the two motor plates; the magnetic part is arranged above the power section; the magnetic field of the magnetic part is perpendicular to a connecting line between the two electrode plates; the ion supplementing device is used for supplementing ions to water in the water channel; water in the power section is electrified through the electrode plate, and Lorentz force is formed through interaction of the magnetic field of the magnetic part and the electrified water flow so as to achieve movement of the water flow.

The invention provides an impact jet flow double-layer micro-channel heat sink structure with fins and a working method thereof, and belongs to the technical field of micro-channel enhanced heat dissipation, the impact jet flow double-layer micro-channel heat sink structure comprises an upper-layer micro-channel, a lower-layer micro-channel and a plurality of partition plates, the upper-layer micro-channel and the lower-layer micro-channel are connected through a middle layer, and the partition plates vertically penetrate through the upper-layer micro-channel and the lower-layer micro-channel; the upper-layer micro-channel comprises a heat sink top, a first inlet area is arranged on the heat sink top, a flow dividing area is arranged on the lower portion of the first inlet area, flow guiding areas are arranged on the two sides of the flow dividing area, a second inlet area and a third inlet area are arranged at ports of the two sides of the upper-layer micro-channel respectively, and fins are installed below the heat sink top. A confluence area is formed between the fins and the middle layer, the lower-layer micro-channel comprises a heat sink substrate, and outlet areas are arranged at ports of the two sides of the lower-layer micro-channel respectively; the heat exchanger has the characteristics of high efficiency, relatively uniform convective heat exchange performance, low energy dissipation and high overall heat exchange.

The utility model discloses a blowing device which comprises a first air outlet cylinder, a second air outlet cylinder, a drainage device and a heating mechanism, and a first air outlet channel is formed in the first air outlet cylinder; the second air outlet cylinder is connected to the first air outlet cylinder, a drainage cavity and a second air outlet channel are formed in the second air outlet cylinder, and the second air outlet channel communicates with the drainage cavity and the first air outlet channel; the heating mechanism is arranged in the first air outlet channel and comprises a heat insulation sheet and a heating wire, the heating wire is wound around the heat insulation sheet, a plurality of heating wire sections arranged side by side are formed on the first surface and the second surface of the heat insulation sheet correspondingly, and the heating wire sections extend in the airflow direction of the first air outlet channel; the first air outlet channel and the channel inner wall of the first air outlet channel are arranged at intervals. According to the technical scheme, noise generated by the air blowing device and heating power consumption are reduced, and practicability and reliability of the air blowing device are improved.

The utility model relates to a turbo pump and a breathing machine. The turbine pump comprises an upper shell, a lower shell and a rotor, wherein the upper shell is provided with an air inlet; the lower shell is arranged below the upper shell, an installation space is defined by the lower shell and the upper shell, the lower shell is provided with an air outlet pipe communicated with the installation space, the air outlet pipe is spirally arranged on the surface, away from the upper shell, of the lower shell, and the longitudinal section area of the air outlet pipe is gradually increased in the air outlet direction; the impeller is rotatably arranged in the mounting space; and the brushless motor is located on the side, away from the upper shell, of the lower shell, and the output end of the brushless motor penetrates through the lower shell to be connected with the impeller so as to drive the impeller to rotate. In this way, the airflow can flow in the tangential direction of the spiral inner wall of the air outlet pipe, and stable conveying of the airflow is achieved. Meanwhile, the energy loss of the airflow in the air outlet pipe can be reduced, so that the gas flow and pressure of the airflow output by the turbine pump are increased, the response time of the turbine pump is guaranteed, and the use performance of the breathing machine is guaranteed.

The invention discloses a 3D (three-dimensional) printing method capable of spreading powder while printing, which belongs to the technical field of 3D printing and comprises the following steps: S1, by taking a powder spreading scraper as a reference, arranging areas with a plurality of widths in the front and back of the moving direction of the powder spreading scraper as laser sintering closing areas, defining the printing working surface at the front part of the laser sintering closing area as an upper-layer pattern printing area, and defining the printing working surface at the rear part of the laser sintering closing area as a lower-layer pattern printing area; and S2, a powder spreading scraper moves at a constant speed to spread powder, the laser sintering closing area moves along with the powder spreading scraper, the width of the upper-layer pattern printing area and the width of the lower-layer pattern printing area change along with the powder spreading scraper, and meanwhile, laser is adopted for conducting laser sintering printing on the upper-layer pattern printing area and the lower-layer pattern printing area. The time of laser printing image interruption caused by powder laying can be shortened, and the printing speed is increased.

The utility model relates to the technical field of mechanical engineering, in particular to an air-floating suspension high-speed fan box which comprises a frame, supporting legs are arranged at the bottom of the frame, rubber pads are arranged at the bottom ends of the supporting legs, an air outlet flange door plate is arranged on the left side of the frame, and a ventilation door plate is arranged on the right side of the frame. The defects in the prior art are overcome, certain errors can be generated in the installation process by utilizing the ductility of the hoses through the corresponding hoses, the installation difficulty and the production cost can be reduced by replacing steel pipes with the hoses, gaps can be filled through the arranged noise reduction cotton, and the noise reduction effect is good. Through the arrangement of the air exhaust box, smooth flowing of airflow can be ensured, right-angle or acute-angle turning is avoided, sudden change and disturbance of the airflow in the air duct are reduced, the uniformity and stability of airflow flowing are improved, the airflow is guided to flow in the preset direction, and turbulent flow and impact are reduced.

The present invention discloses an annealing furnace shell and a glass annealing production line, and relates to the technical field of glass production. The annealing furnace shell includes an outer shell and a guide plate. The outer shell is provided with an internal cavity for accommodating a conveying roller, the guide plate is arranged in the internal cavity, and is connected to the top of the outer shell, the guide plate is provided with a plurality of guide holes, the plurality of guide holes are arranged in parallel and spaced along a first direction, the guide holes are extended along a second direction, the second direction is the conveying direction of the conveying roller, the first direction and the second direction form a preset angle, and the preset angle ranges from 20 degrees to 90 degrees. Compared with the prior art, the annealing furnace shell provided by the present invention adopts a guide plate connected to the outer shell and a guide hole provided on the guide plate, so that turbulence of the internal air can be avoided, the internal temperature field can be ensured to be stable, the annealing effect can be improved, and precision annealing can be achieved.

The utility model discloses a brake disc casting mold which comprises a pouring cup and a mold core, the transverse pouring gates comprise the first transverse pouring gate and the second transverse pouring gate, the first transverse pouring gate is connected with the pouring cup and extends outwards in the first direction, the second transverse pouring gate is connected with the pouring cup and extends outwards in the second direction, and a first included angle space is formed between the first transverse pouring gate and the second transverse pouring gate; the cavity is provided with a first inlet and a second inlet, and the first inlet and the second inlet are symmetrically distributed on the two sides of the cavity relative to the center of the cavity; wherein the mold cavity comprises a first mold cavity, the first mold cavity is arranged in the first included angle space, the first cross gate is connected to a first inlet of the first mold cavity through the first flow gate, and the second cross gate is connected to a second inlet of the first mold cavity through the second flow gate. The brake disc casting mold is excellent and stable in mechanical property, the brake performance of a whole vehicle can be improved, meanwhile, defective products can be reduced, and the production and management cost of an enterprise is reduced.

The invention discloses an ocean lateral particulate matter catcher, and belongs to the technical field of ocean particulate matter collection, the catcher comprises a floating body and a shell which are connected up and down, the side of the shell is provided with a first collection port, a collection bottle is arranged in the shell in a surrounding manner, a turntable is arranged above the collection bottle, and a motor for driving the turntable to rotate is arranged in the shell; a wing plate is arranged on the side, away from the first collecting opening, of the shell and extends towards the first collecting opening, the shell is provided with a conical wall with the small end facing downwards, the collecting bottle is arranged below the conical wall, a second collecting opening is further formed in the side of the shell, and the second collecting opening and the first collecting opening are both formed in the upper portion of the conical wall. And the at least two second acquisition ports and the first acquisition ports are arranged in a staggered manner. The device is simple in structure, and multi-directional and stable collection can be achieved within a preset range without anchoring.

The invention relates to the field of port construction and production, in particular to a multifunctional floating operation platform for port and navigation, which comprises a plurality of floating box bodies, a deck is arranged at the tops of the floating box bodies, platform frames are arranged on the left and right sides of the top of the deck, and a head-on plate is arranged at the front end of the deck and is of a plate-shaped structure. By arranging the self-adaptive anti-impact assembly, the angle of the anti-impact plate can be automatically adjusted according to the water flow impact strength, when water flow impacts the head-on plate from the front side, the anti-impact plate can automatically rotate through the synergistic effect of a linkage plate, a first linkage block, a second linkage block, a rotating block and other components, and when water flow impact is small, the anti-impact plate can automatically rotate. The anti-impact plate is in the initial state that the anti-impact plate is flush with the left side and the right side of the deck, small water flow can be effectively prevented from interfering the internal structure of the platform, the normal working environment of the platform is maintained, and when large water flow impact occurs, the anti-impact plate can rotate to a proper angle in time, the contact area with the water flow is increased, and the water flow impact force is better received and dispersed.

The invention relates to the technical field of glass processing post-processing equipment, and discloses a glass cleaning machine with an air knife drying function, which mainly comprises a rack, a conveying assembly and an air knife assembly. The conveying assembly is arranged on the rack, and glass plates can be conveyed on the conveying assembly. The air knife assembly is also arranged on the rack and corresponds to the glass plate in position so as to conduct air supply drying on the surface of the glass. The rack is further provided with an air supply assembly, and the air supply assembly communicates with the air knife assembly through a pipeline so that dry airflow can be conveyed to the air knife assembly when the air supply assembly works. The air supply assembly and the air knife assembly are communicated through a rigid flow guide pipe, so that a pipeline cannot shake when airflow flows. The glass cleaning machine with the air knife drying function is high in stability, excellent in drying effect, capable of saving energy and environmentally friendly.

The invention discloses a high-efficiency mist-discharging high-capacity atomizing tank which comprises a tank body and a tank cover, the tank cover is detachably arranged at the upper end of the tank body, a mist outlet is formed in the middle of the tank cover, an atomizing core mounting cavity is formed in the lower portion of the mist outlet, an atomizing core is mounted in the atomizing core mounting cavity, and the atomizing core is mounted in the atomizing core mounting cavity. The atomizing core mounting cavity is communicated with the outside through a compressed air inlet, one side of the top of the tank cover is provided with an air supply port penetrating through the top and the bottom, the lower side of the atomizing core is in butt joint with a liquid suction pipe vertically extending to the bottom of the tank body, and a liquid suction channel is formed in the liquid suction pipe; the upper end of the liquid suction channel is communicated with a nozzle at the lower end of the atomizing core, a surrounding part surrounding the atomizing core is arranged in the middle of the lower end of the tank cover, a mist gathering cavity is defined by the surrounding part, and the mist gathering cavity is communicated with the mist outlet through a communication groove. The problems that an existing atomization tank is small in compressed gas flow rate application range and low in atomization efficiency can be solved.

The utility model relates to a kind of for prothioconazole oxidation synthesis light heavy component automatic separation device, belong to chemical production technical field, including prothioconazole oxidation synthesis component phase tank, mixed liquor regulating valve, light component regulating valve, heavy component regulating valve, flowmeter, mixed liquor regulating valve, light component regulating valve, heavy component regulating valve, flowmeter are all set to prothioconazole oxidation synthesis component phase tank, prothioconazole oxidation synthesis component phase tank is provided with mixed liquor feed inlet, light phase outlet, heavy phase outlet, blow-off, the utility model, optimization tank body structure realizes unpowered high-efficiency separation, reduce equipment cost, improve separation precision and product purity, by phase tank stratification structure optimization, light / heavy phase outlet height difference design and valve control, to effectively reduce entrainment rate, interface height and flow are monitored in real time, dynamically regulate valve opening, when heavy component proportion increases, automatically increase heavy component valve opening, to effectively reduce artificial dependence.

The invention provides a method for reducing the first-drop line breaking frequency of a single crystal furnace, and relates to the field of monocrystalline silicon production. The method comprises the following steps: S10, starting an auxiliary pump, and communicating the auxiliary pump with an auxiliary chamber of the single crystal furnace for vacuumizing operation; s20, after the pressure in the furnace body reaches the first set furnace pressure P1, communication between the auxiliary pump and the auxiliary chamber is cut off, and the auxiliary pump is closed; s30, starting a main pump, communicating the main pump with a main chamber of the single crystal furnace, and introducing protective gas; s40, the communication between the main pump and the main chamber is cut off, and the main pump is closed; according to the invention, impurity diffusion and residue can be reduced, so that the first-casting line breaking frequency of the single crystal furnace is reduced.

The invention discloses a heat recovery device of an artificial climate chamber refrigerating system, and relates to the technical field of heat recovery. The heat recovery device of the refrigeration system of the phytotron comprises a refrigeration device, a discharge port is formed in the outer wall of the refrigeration device, and a guide mechanism is fixedly connected to the outer wall of the refrigeration device. According to the heat recovery device for the refrigerating system of the phytotron, by means of the special structural design of the bent pipe and the application of the Bernoulli principle, it is ensured that impurities carried by gas can smoothly flow into the impurity box under the pushing of pulse airflow through the pressure difference formed at the exhaust hole, and in the long-term operation process, even if the gas contains many impurity particles, the impurities can still flow into the impurity box. Impurities such as dust and greasy dirt are removed, deposition of the impurities in the bent pipe and a follow-up heat recovery component is reduced, the problem that an airflow channel is blocked due to impurity accumulation is solved, stable operation of the device is guaranteed, and the equipment maintenance cost and downtime caused by blocking are reduced.

The invention relates to the technical field of coating film making equipment, in particular to a building waterproof coating film making device and application thereof.The building waterproof coating film making device comprises a bottom plate, a square mounting groove is formed in the bottom plate, and a scraper is arranged in cooperation with the mounting groove; the scraper comprises a pair of sliding rails which are symmetrically arranged, and the pair of sliding rails are connected with the two ends of the scraper in a sliding mode through sliding sleeves correspondingly. The sliding sleeve is connected with the scraper through a connecting piece, and an adjusting mechanism is arranged on the connecting piece. The height of the scraper can be accurately controlled to adjust the thickness of a coating film, the scraper is uniformly stressed, and the thickness of each part of the coating film can be consistent; through the adjustable base provided with the laser leveling mechanism, the bottom plate can be accurately controlled to keep horizontal, so that the coating film making quality is effectively improved, and the phenomenon of non-uniform coating is avoided.

The utility model relates to the technical field of electric tilting valves, and discloses a novel electric tilting valve which comprises a supporting pipe, annular connecting plates are fixedly connected to the front end and the rear end of the supporting pipe respectively, a plurality of mounting holes are formed in the middles of the annular connecting plates, and annular limiting grooves are formed in the front end and the rear end of the supporting pipe respectively. The middle of the inner wall of each annular limiting groove is fixedly connected with an annular rubber ring, the annular rubber rings and the limiting grooves are arranged, the rubber rings are embedded in the annular limiting grooves in the two ends of the supporting pipe, double sealing is formed through pressing, and the leakage problem caused by vibration or deformation of a traditional valve body is solved; the installation holes in the annular connecting plate support rapid flange installation, the sealing face is evenly stressed, local stress concentration caused by traditional bolt direct connection is avoided, the servo motor and the rotating shaft are arranged, the rotating angle of the rotating shaft is controlled through the servo motor, and linear adjustment of flow or pressure is achieved.

The utility model discloses a grassland irrigation device for grassland-light complementation, relates to the technical field of grassland-light complementation systems, and aims to solve the technical problem that the current irrigation device is inconvenient to carry out variable irrigation on water source demand quantity according to different areas of grassland under a photovoltaic panel. The irrigation pipeline is composed of the first rectangular pipe, the second rectangular pipe, the third rectangular pipe and the fourth rectangular pipe, and the first rectangular pipe, the second rectangular pipe, the third rectangular pipe and the fourth rectangular pipe are sequentially sleeved from outside to inside. And the pipe diameters of the connecting pipes between the first rectangular pipe and the second rectangular pipe, between the second rectangular pipe and the third rectangular pipe and between the third rectangular pipe and the fourth rectangular pipe are sequentially reduced, and the water pressure is gradually reduced due to the reduction of the pipe diameters of the connecting pipes, so that the water pressure in the first rectangular pipe, the second rectangular pipe, the third rectangular pipe and the fourth rectangular pipe is also gradually reduced.

The application relates to the technical field of air conditioners, and discloses a baffle. The baffle provided by the application comprises a baffle body and flanges. The baffle body is an arc-shaped air deflector, the baffle body is installed in a shell of an air conditioner indoor unit, and the baffle body is used for guiding airflow. The flanges are two, the two flanges are arranged on the two sides of the baffle body in the length direction, the flanges are perpendicular to the baffle body, and the flanges are used for being close to adjacent elements to cut off the airflow on the two sides of the baffle body. The baffle is used for a reversing air supply air conditioner indoor unit, the baffle body can separate the inlet airflow and the outlet airflow, further, the flanges can better block the inlet airflow and the outlet airflow of the air conditioner indoor unit, so that the problems of airflow turbulence and turbulence on the two sides in the air conditioner indoor unit are avoided. The application further discloses an air conditioner indoor unit.

The present invention relates to the technical field of generator set equipment, and discloses a clustered arrangement structure of circulating water supply system buildings, including a cooling water circulation building group, the cooling water circulation building group includes a cooling tower, a water collection tank, a return ditch, a water absorption well and a circulating water pump room, a plurality of cooling towers are provided, and a plurality of cooling towers are connected in a straight line to form a cooling tower row, the cooling tower row is arranged on the water collection tank, and air inlets are provided on both sides of the cooling tower that are relatively distributed along the width direction of the cooling tower row, the water collection tank, the return ditch and the water absorption well are connected in sequence and the water flow direction remains unchanged, the circulating water pump room is located on one side of the length direction of the cooling tower row, the return ditch and the water absorption well are arranged in sequence between the cooling tower row and the circulating water pump room, a circulating water pump is provided in the circulating water pump room, and the water absorption port of the circulating water pump is connected to the water absorption well. The present invention has a reasonable layout, effectively reduces the occupied area without affecting the air intake cooling effect of the cooling tower, saves engineering investment, and maintains the stability of the water flow state in the system.

The utility model relates to the technical field of hot air generating furnace bodies, and discloses an efficient hot air generating furnace body, which includes a combustion chamber. A front-section prototype is fixedly connected to the left side of the combustion chamber, and a furnace neck is communicated and arranged on the left side of the front-section prototype. Through the design of the front-section prototype and the rear-section prototype ring of the combustion chamber in the utility model, the function of stabilizing the flow is achieved, thereby preventing the phenomenon of turbulent flow of hot air inside. Then, the silicon-aluminum coating applied to the combustion chamber has high heat resistance, which can effectively prevent oxidation and corrosion inside the combustion chamber at high temperatures. Then, through the ceramic coating applied to the surface of the combustion chamber, this coating can not only withstand high temperatures but also effectively insulate heat and prevent heat loss, thereby improving the combustion efficiency inside the combustion chamber. Then, the gas after combustion inside the combustion chamber will be discharged outwards through the hot air outlet, and all parts of this device use SUSS high-temperature resistant plates, so it has a long service life and is applicable to all occasions of hot air drying or heating.

The present invention discloses a Roots blower with a guide device, comprising a casing, the casing is provided with an air inlet and an exhaust port, the air inlet is provided with an air inlet guide cone, an air inlet flow channel is formed between the air inlet guide cone and the inner wall of the air inlet, the exhaust port is provided with an air outlet guide cone, an air outlet flow channel is formed between the air outlet guide cone and the inner wall of the exhaust port, an exhaust cavity with openings at both ends is provided inside the air outlet guide cone, an exhaust hole connected to the exhaust cavity is provided on the casing, the air inlet guide cone and the exhaust guide cone have concave arc surfaces on the side facing the impeller, and a limit protection valve is provided on the side facing the impeller of the air outlet guide cone. By providing the guide cone, a longer flow channel can effectively delay the reflux process of high-pressure gas, and even if the gas enters the volume formed by the impeller and the casing along the flow channels on both sides of the two guide cones, the generation of gas turbulence can be effectively avoided, thereby solving the problem of high noise of the current blower.

The low-noise cooking utensil comprises a pot body, a pot cover and a first heat dissipation assembly installed on the pot cover, the pot cover comprises a surface cover and an inner cover, and the surface cover and the inner cover are matched to define a cooling cavity communicated with the outside. The first heat dissipation assembly comprises a first sealing ring, a mounting cavity and a first fan assembly arranged in the mounting cavity, a first ventilation hole is formed in the bottom wall of the mounting cavity, and air blown out of the first fan assembly flows to the cooling cavity through the first ventilation hole and then is discharged to the outside; a damping gap is formed between the first fan assembly and the side wall of the mounting cavity, and the first sealing ring is arranged between the first fan assembly and the bottom wall of the mounting cavity so as to prevent cold air at the air outlet end of the first fan assembly from flowing to the damping gap. According to the cooking utensil, noise can be effectively reduced, and the air cooling effect can be improved.

The utility model provides a riding helmet noise reduction microphone which comprises a lower shell, a wind shielding structure is arranged on the bottom face of the lower shell and comprises a first wind shielding structure and two second wind shielding structures, the first wind shielding structure is arranged on the front side of the bottom face of the lower shell, and the two second wind shielding structures are arranged on the left side and the right side of the bottom face of the lower shell respectively. The two second wind shielding structures are respectively connected with the first wind shielding structure, the bottom surface of the lower shell, the inner wall of the first wind shielding structure and the two opposite inner walls of the two second wind shielding structures are matched to form a wind shielding space, and at least one pickup hole is formed in the bottom surface of the lower shell and located in the wind shielding space; and the upper shell is mounted on the top surface of the lower shell. According to the design, most airflow is guided to the periphery, direct impact on the pickup hole is reduced, and therefore the noise reduction capacity of the pickup hole is improved.

The utility model discloses a hollow membrane filtration device, including hollow membrane bundle, hollow tube and protective net, the hollow membrane bundle is provided in the said inner cavity, be provided with the cavity between the hollow membrane bundle and the inner wall of inner cavity, feed liquid in the cavity circulates along the axial direction of hollow membrane bundle, the hollow membrane bundle includes a plurality of hollow membrane silk that extends axially, the hollow membrane silk is provided with the protective net. The protection net circumferentially surrounds the outer side of the hollow membrane bundle and extends in the axial direction of the hollow membrane bundle, the protection net comprises a plurality of inner wires spirally arranged in the axial direction of the hollow membrane bundle and a plurality of outer wires spirally arranged in the axial direction of the hollow membrane bundle, a spiral inner channel is formed between every two adjacent inner wires, a spiral outer channel is formed between every two adjacent outer wires, and the outer channels are communicated with the inner channels. And the inner wires and the outer wires are interwoven to form meshes for radial circulation of feed liquid. According to the scheme, the obstruction of the protection net to the biological feed liquid in the circulation process is reduced, and the shearing force to the biological feed liquid is reduced, so that the damage of the shearing force to effective components in the biological feed liquid is reduced.