38results about How to "Reduce airflow noise" patented technology

The mobile air conditioner comprises a shell, a horizontal partition plate is arranged in the shell and divides the shell into an upper cavity and a lower cavity, a first volute assembly made of heat preservation materials is arranged in the upper cavity, a first volute cavity is formed in the first volute assembly, an evaporator is arranged at the air inlet end of the first volute cavity, and a second volute assembly made of heat preservation materials is arranged at the air outlet end of the first volute cavity. The air outlet of the first volute cavity faces upwards; a second volute assembly is arranged in the lower cavity, a second volute cavity is formed in the second volute assembly, a condenser is arranged at the air inlet end of the second volute cavity, and the air inlet end of the second volute cavity and the air inlet end of the first volute cavity are located on different faces of the shell. The mobile air conditioner with the heat preservation air cavity is compact in structure, convenient and rapid to assemble, high in precision, low in working noise and power consumption, large in air outlet amount, long in air supply distance and good in heat dissipation performance, continuous and stable refrigeration of the mobile air conditioner is guaranteed, and the using effect is good.

The air-supply enthalpy-increasing compressor comprises an air cylinder, a partition plate or a flange and a valve body, the partition plate or the flange is connected with the end face of one axial side of the air cylinder, and an air-supply enthalpy-increasing channel is formed in the air cylinder; an injection channel is formed in the end face of the axial side, connected with the partition plate or the flange, of the air cylinder in a sunken mode, the radial inner side of the injection channel is communicated with an inner cavity of the air cylinder, a valve groove is further formed in the connecting position of the injection channel, and at least part of the structure of the valve body is arranged in the valve groove. The side, away from the injection channel, of the valve groove further communicates with a pressure introduction channel, one end of the pressure introduction channel communicates with the valve groove, the other end of the pressure introduction channel can communicate with an inner cavity of the air cylinder, and the valve body can move in the valve groove and the injection channel so as to open or close the injection channel. According to the invention, the problem of poor enthalpy increasing effect caused by unreasonable enthalpy increasing time can be solved; and the air supply amount can be effectively increased, and the air supply requirement is met.

The invention relates to the technical field of vehicle shock absorbers, in particular to a low-noise shock absorber strut assembly and a vehicle. The low-noise shock absorber strut assembly comprises a supporting assembly and a shock absorber assembly. In the supporting assembly, a gasket, a first damping part, an automobile body sheet metal part, a second damping part and a cup base are attached in sequence. A vehicle body sheet metal part is clamped between the first damping part and the second damping part. In the first damping part, the first damping ring and the multiple protruding blocks are integrally formed. The first damping ring and the second damping ring are coaxial. The protruding block is located on the side, facing the second damping ring, of the first damping ring. A plurality of grooves are formed in the side, facing the first damping ring, of a second damping ring of the second damping part. In the shock absorber assembly, one end of a shock absorption cylinder is detachably connected with a cup base. The piston rod sequentially penetrates through the damping cylinder, the cup base, the second damping part and the first damping part in a sliding mode. And the axial depth of the groove along the piston rod is greater than the axial height of the bump along the piston rod. Therefore, the problem of noise reduction of the vehicle shock absorber is solved.

This invention provides a wind-cooled horizontal freezer and its operation control method. The freezer includes: an inner liner having a bottom wall and a stepped wall bent upwards from the bottom wall; a cover plate installed in the inner liner, forming a refrigeration chamber with the inner liner, wherein an evaporator in the refrigeration chamber is arranged side by side with the stepped wall in the left-right direction; multiple air outlets located in the upper part of the storage compartment; an auxiliary air outlet located in the lower part of the storage compartment; and a control system configured to: upon receiving a compressor start command, control the compressor to run, control the fan to run, and control the fan to deliver air to the storage compartment through the multiple air outlets but not through the auxiliary air outlets; during this process, when a human body signal is sensed, control both the multiple air outlets and the auxiliary air outlets to deliver air, or control the multiple air outlets to stop delivering air while the auxiliary air outlets deliver air.

The utility model relates to the technical field of numerical control machining, and discloses a vertical and horizontal five-axis combined machining center which comprises a lathe bed, bases are fixedly arranged at the four corners of the bottom end of the lathe bed respectively, worms and lead screws are rotationally connected into the bases respectively, worm wheels are fixedly arranged at the tops of the lead screws, the worm wheels are connected with the worms in a meshed mode, and the worm wheels are connected with the lead screws in a meshed mode. The base is slidably connected with a supporting assembly, and the supporting assembly is in threaded connection with the lead screw. The utility model has the beneficial effects that the base can uniformly support the four corners of the bottom end of the bed body through the supporting assembly, the worm wheel is rotated through the worm to drive the screw rod to rotate, the supporting assembly can be driven to lift, the height of the supporting assembly can be adjusted, then the supporting assembly can be leveled in the installation process, and after the adjustment, the height of the supporting assembly can be adjusted. Self-locking of the lead screw can be achieved through angular friction between the worm and the worm gear, and looseness of the lead screw and the supporting assembly can be prevented.

The present invention discloses a vector adjustment component of a volute-free fan, characterized in that it includes a flow-leveling component and a rectifying and even-flowing air duct arranged on the periphery of the fan outlet, the flow-leveling component is mainly composed of a plurality of flow-leveling plates arranged along the fan outlet row, wherein a plurality of punching holes are opened on a symmetrically distributed flow-leveling plate, a rectifying and even-flowing space is arranged between the flow-leveling component and the fan outlet, the airflow entering the fan flows out from the air outlet through the impeller, and then flows out from the punching hole through the gradually changing rectifying space, forming the rectifying and even-flowing air duct. The present invention adjusts vectors such as wind speed and wind direction while leveling the flow through the setting of the flow-leveling component to meet the needs of different environments.

The utility model relates to an oil fume exhaust fan sound insulation device with an oil stain discharge function, which is arranged on the outer side of an oil fume exhaust fan and comprises a sound insulation and absorption cover, a flow guide elbow and a silencing device, and the oil fume exhaust fan, the flow guide elbow and the silencing device are sequentially arranged in the sound insulation and absorption cover along the wind direction; the sound insulation and absorption cover is provided with an air inlet and an air outlet, the air inlet end of the oil smoke exhaust fan penetrates through the air inlet of the sound insulation and absorption cover, the air outlet end of the silencing device is correspondingly communicated with the air outlet of the sound insulation and absorption cover, an air duct of the flow guide elbow is arranged in an arc shape, and an oil stain collection box is arranged on the lower side of the flow guide elbow. The device has the advantages of being good in structural stability, small in oil stain discharge amount, good in sound insulation and noise reduction effect and easy to install and maintain in the later period, the oil stain collecting box can be detached and cleaned, and regular cleaning and maintenance are convenient.

The utility model discloses a cross-flow fan volute, and relates to the technical field of fan volutes, the cross-flow fan volute comprises a fan shell, the fan shell is a cavity which is enclosed by a left side plate, a right side plate and a volute together and is provided with an upward opening, and an impeller is arranged in the cavity; a space between the left side plate and the right side plate forms an air inlet duct of the fan, and an air inlet is formed above the air inlet duct; the volute comprises a left volute and a right volute, the lower portion of the left side plate is connected with the left volute, the left volute is connected with the lower side plate, the lower portion of the right side plate is connected with the right volute, and the right volute is sequentially connected with the volute tongue and the upper side plate. The upper side plate and the lower side plate jointly form an air outlet channel on the lower right side of the fan shell, and an air outlet is formed in the tail end of the air outlet channel. The molded lines of the left side volute and the right side volute are logarithmic spiral lines, the initial radius of each molded line is R2, the outlet airflow angle is alpha, the polar angle is phi, and the equation of the logarithmic spiral lines is x = R2 * em.tan alpha cos phi, and y = R2 * em.tan alpha sin phi; the volute tongue structure can reduce airflow resistance, reduce backflow at the bottom of the volute tongue, and reduce vibration and noise of a fan.

The wind wheel assembly comprises a wind wheel body and a wind guide structure, a wind guide channel is formed in the wind guide structure, at least part of the wind wheel body is arranged in the wind guide channel, the wind guide channel is provided with a first wind guide section, the inner wall of the first wind guide section is arranged in an arc shape, and the inner wall of the first wind guide section is provided with a second wind guide section. The first air guide section is arranged in a concave mode back to the rotating center shaft of the wind wheel body, and the inner diameter of the first air guide section is set to be gradually increased in the air outlet direction of the air guide structure. According to the technical scheme, the wind guide structure of the wind wheel assembly is improved, the acting force of blade tip vortexes on the inner wall of the wind guide structure is reduced, and noise generated when the wind wheel assembly rotates is reduced.

A noise reduction air volume regulation control device belongs to the technical field of ocean engineering air conditioner ventilation systems and comprises an air pipe, a noise reduction regulation structure is arranged in the air pipe, a supporting structure is fixedly mounted in the noise reduction regulation structure, and the supporting structure comprises a supporting rod; by means of the noise reduction adjusting structure, when noise reduction and air volume adjustment are conducted on the air pipe, a foamed plastic column is squeezed by hands, due to the fact that the foamed plastic column is soft, the foamed plastic column can be plugged into an air outlet of the air pipe, and the air volume entering a cabin through the foamed plastic column can be adjusted by inserting different numbers of first plungers and second plungers into corresponding holes; and meanwhile, the foamed plastic columns, the first plungers and the second plungers have open structures and high density, so that the device has good sound absorption capacity, the noise reduction capacity of the device can be improved by placing the foamed plastic columns in the air pipe, and the purposes of reducing airflow noise in the air pipe and adjusting and controlling the air volume are achieved.

The utility model belongs to the technical field of atomization, and particularly discloses an airflow adjusting assembly, an atomizer and an electronic atomization device. The airflow adjusting assembly comprises a pressing block structure, an air adjusting piece, an elastic piece and a flow equalizing structure, the pressing block structure is provided with an air inlet and an air outlet communicated with the air inlet, the air adjusting piece is rotationally arranged at the air inlet and used for adjusting the size of the air inlet, the elastic piece is arranged on the pressing block structure, and the flow equalizing structure is arranged between the air inlet and the air outlet. The flow equalizing structure is in transmission connection with the air adjusting piece and abuts against the elastic piece. According to the airflow adjusting assembly, the atomizer and the electronic atomization device, the airflow adjusting amount of the airflow adjusting assembly is controlled through sound generated in the rotation process of the flow equalizing structure and the elastic piece, and meanwhile the flow equalizing structure equalizes the flow of air at the air inlet so as to eliminate noise; the technical problem that in the prior art, an airflow adjusting assembly is low in use performance is solved.

The utility model relates to the technical field of dust removal equipment, in particular to a noise elimination mechanism for dust removal equipment, which comprises a first noise elimination part, the centrifugal fan is arranged on the first silencing part; the second silencing part is arranged on the centrifugal fan; the first silencing part is connected with the centrifugal fan, the silencer is connected with the centrifugal fan, the first silencing part is a cabinet body, a heavy plate is welded to the bottom of the cabinet body, an air pipe opening is formed in the cabinet body, and the cabinet body comprises a metal plate arranged on the heavy plate. Through an assembly composed of the first silencing part, the centrifugal fan, the second silencing part and the silencer, a multi-silencing mechanism is provided for the dust removal equipment so as to reduce noise generated to the outside in the dust removal operation period, the key point is that the fan with large noise pollution is subjected to silencing treatment, vibration noise of the fan body can be reduced, and the service life of the fan is prolonged. And the air flow noise of the exhaust of the fan is weakened, so that the noise of the dust removal equipment forms a maximum area, and a better silencing effect is achieved.

The invention relates to the field of compressor noise reduction, and provides a noise reduction assembly and a compressor, the noise reduction assembly comprises an upper cylinder cover, the upper cylinder cover comprises a base body and an exhaust hole penetrating through the base body in the axial direction of the base body, and the base body is provided with an exhaust slope surrounding the exhaust hole; the silencer comprises a plurality of silencer air outlets, the silencer covers the upper cylinder cover, and a space defined by the silencer and the upper cylinder cover forms a silencer cavity; the at least one flow guide device is positioned in the silencer cavity and is arranged between the exhaust slope and the silencer; the flow guide device is of a convex structure; the refrigerant exhausted from the exhaust hole passes through the exhaust slope, changes the flowing direction under the action of the flow guide device, and flows out of the silencer from the silencer air outlet. According to the silencing assembly and the compressor, the flow guiding device is additionally arranged to guide the high-temperature and high-pressure refrigerant from the exhaust port, so that the airflow noise of the compressor is reduced, and the performance loss of the compressor is reduced.

The utility model relates to a mute air distributor and a ship ventilation system. The air distributor comprises a shell, a fluid inlet and a fluid outlet are formed in the shell, a silencing plate is arranged in the shell and is a curved plate, a plurality of silencing holes are formed in the silencing plate, and the plate face of the silencing plate is perpendicular to the flowing-out direction of fluid in the shell. Compared with the prior art, the noise reduction device is used for being connected with a ship air conditioner to adjust and reduce noise of outlet air of the ship air conditioner; in the using process, the air distributor is communicated with an air outlet of a ship air conditioner through the fluid inlet and communicated with outside air through the fluid outlet, air conditioner air enters the air distributor, passes through the silencing plate and then flows out of the air distributor, the curved plate is arranged on the plate face of the air distributor, the silencing holes are formed in the curved plate, noise generated by airflow is absorbed by the curved plate, and the noise is reduced. The airflow noise is effectively reduced; meanwhile, the plate face of the air distributor faces the flowing-out direction of the fluid, all air flows out through the silencing plate, and the noise reduction efficiency of the air distributor is guaranteed.

The present invention provides a compressor and an air conditioner, wherein the compressor comprises: a fixed scroll disk, an exhaust port is arranged on the fixed scroll disk, and at least two groups of pressure relief holes that can be connected to the internal compression chamber of the fixed scroll disk are also arranged at the bottom of the scroll of the fixed scroll disk, the at least two groups of pressure relief holes are distributed at different circumferential positions around the exhaust port, and each group of pressure relief holes includes at least one pressure relief hole, and a pressure relief valve assembly is arranged at the pressure relief hole, and when the pressure relief hole is connected to the compression chamber and when the pressure in the pressure relief hole is greater than the preset pressure relief pressure, the pressure relief valve assembly opens to relieve the pressure in the compression chamber. According to the present invention, in the over-compression working condition, the flow area of ​​the unloading channel can be effectively increased by the additional pressure relief holes, and the power consumption loss of additional pressure relief and exhaust can be avoided. Since the pressure relief holes are partially opened and partially closed, the useless clearance volume in the pump body can be effectively reduced, the working volume efficiency of the compressor pump body can be improved, and the energy efficiency of the whole machine can be improved.

The turbine shell comprises a fan shell and an air inlet box installed on one side of an air inlet pipe opening of the fan shell, the air inlet box comprises a box cylinder, an air inlet plate installed on one side of the box cylinder and an air guide plate arranged on the other side of the box cylinder, an air inlet is formed in the center of the air inlet plate, and an air outlet is formed in the center of the air guide plate. And a filtering piece is detachably mounted on the inner side of the air inlet plate corresponding to the air inlet. The air inlet box can be installed on the air inlet pipe opening of the fan shell through the flange plate, and the first air guide barrel and the filter element barrel arranged at the outer end of the first air guide barrel in a sleeving mode are used for filtering and dedusting guided-in air. The air inlet box is subjected to noise reduction treatment through the first air guide cylinder and the second air guide cylinder and the third air guide cylinder which are distributed, mutual interference and offset are achieved through sound wave reflection in air flow, and therefore noise generated by the air flow is reduced, and the effect of reducing the noise of the air flow is achieved; noise reduction and dust removal are carried out on the guided air, and the cleanliness of the air guided into the fan shell is improved.

This invention discloses a refueling pipe assembly with a throttling structure in the field of automotive fuel supply system technology. The assembly includes a refueling pipe and a circulation pipe. The circulation pipe has a throttling structure, which is a locally extruded deformation portion formed on the side wall of the circulation pipe. This deformation portion protrudes inward, forming a throttling orifice with a concave lens-shaped cross-section on the inner side of the pipe wall. An arc-shaped buffer section is provided between the throttling orifice and the outlet end of the circulation pipe. This invention can reduce refueling noise, simplify the throttling orifice process, and improve the reliability of the ORVR system.

The utility model belongs to the technical field of air valves, and particularly relates to a mute air valve and a pneumatic comfort system. The mute air valve comprises a valve body and a movable valve element, the valve body is provided with an air inlet, an air outlet and a valve cavity communicated with the air inlet and the air outlet, the movable valve element is arranged in the valve cavity, and an air channel is arranged between the movable valve element and the inner wall of the valve cavity. The air channel is communicated with the air inlet and the air outlet, the air channel is provided with a silencing part, and the silencing part is provided with a micro air flow channel allowing air to circulate. According to the silent air valve, slow descending can be conducted on gas stream entering the air channel after impacting the movable valve element, airflow flows evenly in all directions, the airflow fluctuation condition of turbulent flow and vortex is prevented, the overall working stability of the air valve is improved, impact and friction between the airflow and the air channel can be reduced, airflow noise is reduced, and the service life of the air valve is prolonged. Therefore, the comfort of the automobile seat comfort system is improved.

This application provides a silencer, an oxygen generator, and a device with a silencer. The silencer includes: a housing; a flow-guiding silencer assembly disposed inside the housing, including: at least one longitudinal flow-guiding baffle extending axially along the housing; at least one transverse flow-guiding baffle, each transverse flow-guiding baffle penetrating the longitudinal flow-guiding baffle and extending to the inner wall of the housing; an air inlet disposed in the housing; and an exhaust outlet disposed in the housing. The longitudinal and transverse flow-guiding baffles divide the inner cavity of the housing into multiple chambers, the air inlet corresponds to one of the multiple chambers, and the exhaust outlet corresponds to another of the multiple chambers. The silencer of this application embodiment can significantly improve noise reduction without affecting gas flow efficiency.

The utility model belongs to atomization technical field, specifically discloses a kind of airflow regulating assembly and the atomizer with it.The airflow regulating assembly includes briquetting structure, air-regulating piece and flow equalizing structure, and briquetting structure has air inlet and the air outlet being communicated with air inlet on, air-regulating piece is rotationally arranged at air inlet for adjusting the size of air inlet;Flow equalizing structure is arranged between air inlet and air outlet, and flow equalizing structure is transmission connection with air-regulating piece, and the end face of flow equalizing structure has the flow equalizing hole being communicated with air inlet and air outlet.The airflow regulating assembly provided by the utility model eliminates noise by flow equalizing structure and flow equalizing hole to the gas flow of air inlet, solves the technical problem of low performance of airflow regulating assembly caused by airflow noise in prior art.

The anti-howling structure extrusion pipe comprises a plurality of pipe section units, and each pipe section unit comprises a first pipe section, a second pipe section connected with the first pipe section and a third pipe section connected with the second pipe section; the first pipe section in one pipe section unit is connected with the third pipe section of another adjacent pipe section unit through a connecting part; a connecting groove is formed in the first pipe section; the pipe section unit further comprises an anti-howling structure used for preventing airflow from entering the connecting groove, and the anti-howling structure is of a protruding structure and extends from the inner wall, away from the extrusion pipe of the anti-howling structure, of the pipe body to the axis direction of the pipe body. The anti-howling structure is closer to the axis of the pipe body than the first pipe section. The anti-howling structure extrusion pipe has the beneficial effect that the anti-howling structure extrusion pipe capable of reducing airflow noise is provided.

The present invention discloses an airflow silencer and guide device for air power equipment, comprising a flow guide mechanism and a silencer mechanism, wherein the flow guide mechanism comprises a multi-stage flow guide silencer cone, a positioning bracket assembly, a protective cover and a docking flange, wherein the multi-stage flow guide silencer cone is stacked up and down and distributed in a gap-like manner, the positioning bracket assembly comprises a plurality of support rods and a connecting ring, the protective cover is arranged on the multi-stage flow guide silencer cone, the lower end of the docking flange is connected to the silencer mechanism, the silencer mechanism comprises a silencer body and a silencer cylinder, the silencer body is located inside the silencer cylinder, and a gap is provided between the silencer bodies, and the gap constitutes a ventilation duct; the airflow is poured into the inside of the protective cover from all sides through the ventilation holes on the protective cover, and after the airflow passes through the flow guide cone, an annular airflow is formed, and the airflow quickly enters the ventilation duct, and while the airflow passes through the ventilation duct, the noise is efficiently reduced by relying on the silencer cylinder and the silencer body constituting the two sides of the ventilation duct.

The utility model relates to a control box and having the control box, the control box includes: air pump module and silencing module, the silencing module includes first silencing cavity, second silencing cavity, switch element, first air pipe, second air pipe, the first silencing cavity is used for communicating with the air pump module, the second silencing cavity is used for communicating with the second silencing cavity, the switch element is used for communicating with the first air pipe, the second air pipe is used for communicating with the second silencing cavity. The first air pipe communicates with the first silencing cavity to output air pressure to inflate an external device, and the second air pipe communicates with the first silencing cavity and communicates with the second silencing cavity through a switch element. The switch element is used for being closed when the first air pipe inflates an external device and being opened when the first air pipe deflates so that the first silencing cavity can communicate with the second silencing cavity.

The utility model discloses a breathing mask and breathing equipment, the breathing mask comprises a face frame and a noise reduction sheet, the face frame is provided with an air inlet and an air outlet, the noise reduction sheet is arranged at the air outlet, the noise reduction sheet is a metal sheet, and the noise reduction sheet is provided with a plurality of noise reduction holes arranged at intervals. The noise reduction piece can be a metal piece, and a plurality of noise reduction holes are formed in the noise reduction piece at intervals. The noise reduction sheet made of the metal material is higher in strength, the noise reduction holes formed in the noise reduction sheet can be denser, and airflow can be dispersed through the noise reduction holes in the noise reduction sheet when passing through the noise reduction sheet, so that the airflow resistance is reduced, the airflow noise is reduced, and the use comfort is improved. And the metal sheets are not easy to age and damage, so that the stability of the noise reduction effect can be ensured.

The invention discloses an air outlet frame part and an air conditioner with the air outlet frame part, the air outlet frame part is used for air supply equipment, the air outlet frame part comprises an air outlet frame and a noise reduction assembly, an air outlet duct is formed in the air outlet frame, and the air outlet frame is provided with an airflow inlet and an air outlet which communicate with the air outlet duct. The noise reduction assembly comprises at least one sound absorption material piece, the sound absorption material piece is arranged on the wall face of the air outlet duct, and at least part of the sound absorption material piece is located on the wall face right facing the airflow inlet. According to the air outlet frame component, the noise reduction assembly is arranged, so that the airflow noise of the air outlet frame component can be reduced, and the working noise of the air outlet frame component is reduced. And at least part of the sound-absorbing material piece directly faces the airflow inlet, the sound-absorbing and noise-reducing effects of the sound-absorbing material piece are good, and the noise of the air outlet frame component is further reduced.

The application provides a motor rotor and a compressor, wherein the motor rotor comprises a rotor core, a plurality of air holes and at least one sound attenuation cavity are arranged on the rotor core, the plurality of air holes are arranged around the axial direction of the rotor core and penetrate through opposite ends of the rotor core, and the sound attenuation cavity is arranged beside the air hole and is a closed columnar cavity; wherein the two ends of the columnar cavity are closed in the rotor core; or at least one end of the columnar cavity is an open end, and the open end is sealed by a component on the end face of the rotor core. In the motor rotor and the compressor provided in the application, by arranging the sound attenuation cavity on the rotor core and arranging the sound attenuation cavity as a closed columnar cavity, not only can the structural interference of the pump body caused by the arrangement of the sound attenuation cavity be avoided, but also the airflow noise of the compressor can be reduced, and the noise and vibration of the compressor can be effectively improved.

The invention discloses an air outlet frame component and an air conditioner with the air outlet frame component, the air outlet frame component is used for air supply equipment, the air outlet frame component comprises an air outlet frame and a noise reduction assembly, an air outlet duct is formed in the air outlet frame, and the air outlet frame is provided with an airflow inlet and an air outlet which communicate with the air outlet duct; the noise reduction assembly comprises a micropore set and a sound absorption material piece, the micropore set comprises a plurality of micropores formed in at least part of wall plates of the air outlet frame, the wall plate, provided with the micropore set, of the air outlet frame is a micropore plate, and the sound absorption material piece is arranged on the windward side and / or the leeward side of the micropore plate. According to the air outlet frame component provided by the embodiment of the invention, the noise reduction assembly is arranged, so that the airflow noise of the air outlet frame component can be reduced, and the working noise of the air outlet frame component is reduced. And by arranging a dual noise reduction structure of the micropore group and the sound absorption material piece, the noise reduction assembly is good in sound absorption and noise reduction effect, and the noise of the air outlet frame component is further reduced.

The invention discloses a tunnel fan. The tunnel fan comprises a fan body; the front-end silencer and the rear-end silencer comprise an outer barrel, an inner barrel and an inner barrel, the glass wool board layer is laid on the inner side wall of the outer cylinder body; the polymer metal damping sound insulation felt layer is laid on the glass wool board layer; the multiple silencing pipes are arranged in the outer barrel at intervals, multiple sets of silencing holes are formed in the side walls of the silencing pipes in an array mode, and the hole diameters of the silencing holes are sequentially decreased in the air flow direction; and the frequency converter is connected with a motor of the fan body. The transmission of noise can be absorbed, blocked and reduced, and an efficient noise reduction effect is provided for the fan body. The invention further discloses an internet-of-things frequency conversion regulation and control device which comprises an internet-of-things module which is provided with a gateway module, is connected with the frequency converter and is used for receiving an issued instruction and controlling the motor of the fan body through the frequency converter; a mobile client; a fan remote controller; and the central dispatching room display screen realizes remote control of the frequency converter by the mobile client, adjusts the operation parameters of the fan body, and adapts to the environment state of the tunnel.

The air outlet frame component comprises an air outlet frame and a noise reduction assembly, an air outlet channel is formed in the air outlet frame, the noise reduction assembly comprises at least one sound absorption plate, the sound absorption plates are arranged at the positions, close to the inner wall face, in the air outlet frame, and the two opposite sides of each sound absorption plate face the inner wall face and the air outlet channel correspondingly. The sound absorption plate comprises a plurality of first plate areas and a second plate area, and the first plate areas protrude towards the direction of the air outlet duct, so that first sound attenuation grooves are formed in the sides, facing the inner wall surface, of the first plate areas; a second plate area is arranged between every two adjacent first plate areas, and a second silencing groove is formed in the side, facing the air outlet channel, of each second plate area. Sound absorption holes extending in the thickness direction of the sound absorption plate are formed in the sound absorption plate, and at least one sound absorption hole communicates with the first silencing groove. By arranging the noise reduction assembly, the air flow noise of the air outlet frame component is low, and the working noise is reduced.

The utility model relates to the field of kitchen appliances, and discloses an exhaust structure for an integrated cooker and the integrated cooker. The exhaust structure for the integrated cooker comprises an exhaust channel, the two ends of the exhaust channel are provided with an air outlet and an air inlet which are communicated with the outside respectively, the two opposite inner walls in the exhaust channel are each provided with at least one noise reduction blocking piece, and the noise reduction blocking pieces on the two sides are distributed in a staggered mode in the extending direction of the exhaust channel. When the functional parts of the integrated cooker work, generated water vapor can be blocked and guided by the noise reduction baffles when passing through the multiple noise reduction baffles which are distributed in a staggered mode, most energy of noise entering the exhaust channel along with the water vapor is consumed after multiple times of turning and reflection, and therefore the effect of reducing airflow noise is achieved.