34 results about "Perfboard" patented technology

The invention belongs to the technical field of low-frequency sound absorption, and discloses a micro-perforated plate composite gradient spiral pipe sound absorption device and method.The micro-perforated plate composite gradient spiral pipe sound absorption device comprises a variable cross-section spiral pipe, and the diameter of the inlet end of the variable cross-section spiral pipe is larger than that of the outlet end of the variable cross-section spiral pipe; a plurality of MPP plates are mounted in the variable-cross-section spiral pipe, one MPP plate is embedded into the inlet end of the variable-cross-section spiral pipe, and the other MPP plates are sequentially embedded into the variable-cross-section spiral pipe at equal intervals, so that a multi-stage MPP plate composite sound absorption structure is formed; and the cross-section pipe diameter of the variable cross-section spiral pipe is linearly reduced from the inlet end of the variable cross-section spiral pipe to the outlet end of the variable cross-section spiral pipe. Through the gradient design of the variable cross-section spiral tube integrated micro-perforated plate, low-frequency broadband efficient sound absorption is realized in a compact space, the problem of heavy structure caused by dependence on a deep and large back cavity in the traditional technology is avoided, the limitation of narrow sound absorption frequency band is overcome, and the sound absorption device is particularly suitable for being applied to occasions with limited spaces and has wide application prospects. And low-frequency performance and broadband characteristics are considered in a limited space.

The invention discloses a design method of an array type silencer adaptive to a main ventilation air path between a stator iron core of a hydraulic generator and an air cooler and the array type silencer, and relates to the technical field of suppression or reduction of noise of the hydraulic generator. The method comprises the steps of S1, obtaining aerodynamic noise data and airflow parameters of a main ventilation air path, S2, determining a silencing thought and a micro-perforated plate array core structure according to broadband vortex, discrete rotation, vortex falling and surge noise, S3, determining the boundary dimension and preliminarily calculating the airflow parameters, S4, designing plate parameters in combination with a micro-perforated resonance formula, and S5, calculating the noise of the micro-perforated plate array. S5, performing simulation optimization and S6, accurately accounting airflow parameters, and locking a scheme meeting requirements; the silencer comprises a shell and a plurality of micro-perforated plates, and the multiple layers of micro-perforated plates are arranged in series. The invention has the advantages of no sound absorption material, low wind resistance (the air volume attenuation is less than or equal to 5%, and the pressure loss is less than or equal to 200Pa), the noise of the main wind path is reduced by 5-7dB (A), the service life is long, the operation and maintenance cost is low, and the requirements of the main wind path are met.

Embodiments of the present disclosure provide an apparatus, a system, and a method. The apparatus is configured to depowder and extract one or more printed parts prepared by a three-dimensional (3D) printer. The apparatus includes an elevated frame, a perforated plate, a lifting-lowering mechanism, a depowdering unit, and at least one gripper. The elevated frame is removably secured to an open top of a first container and configured to transversely receive fully raised at least one 3D printed layer and partially raised at least one powder layer. Upon lifting the elevated frame along with the perforated plate, the depowdering unit is configured to depowder the at least one powder layer and powder in between the one or more 3D printed parts. The at least one gripper is configured to automatically extract the one or more 3D printed parts.

The utility model relates to the technical field of centrifugal fans, and discloses a multistage noise reduction flow guide structure of a centrifugal fan, which comprises a centrifugal fan main body, the inner wall of the centrifugal fan main body is fixedly connected with sound absorption cotton, one end of the centrifugal fan main body is fixedly connected with a flow guide cylinder, and the inner wall of the flow guide cylinder is fixedly connected with a noise reduction component. A dustproof assembly is arranged at one end of the guide cylinder, the noise reduction assembly comprises a double-layer micro-perforated plate arranged on the inner wall of the guide cylinder, a honeycomb metal guide plate is fixedly connected into the double-layer micro-perforated plate, and the dustproof assembly comprises a mounting plate arranged at one end of the guide cylinder. According to the multi-stage noise reduction flow guide structure of the centrifugal fan, by arranging the sound absorption cotton, the reinforcing layer and the noise reduction assembly, the purpose of multi-stage noise reduction is achieved, the situation that when airflow enters the air inlet, vortexes can be formed, generated airflow turbulence collides with the fan in a large amount, and large noise is generated is avoided, and sound pollution generated by the centrifugal fan can be improved.

As shown in the reference diagram, this product is an indoor sound-absorbing board comprising a peripheral wall and a perforated plate, with a rear air layer defined by the peripheral wall and the perforated plate. The peripheral wall is positioned in the front, up / down, and left / right directions relative to the perforated plate. The rear air layer is defined by closing the opening in the peripheral wall with the perforated plate. The holes formed in the perforated plate are entry and exit points for sound to and from the rear air layer. The parts for which registration is sought are the left / right peripheral wall and the perforated plate (excluding the holes), and because the perforated plate is curved, multiple different resonance frequencies are set for each region where the depth (thickness) of the rear air layer is steplessly non-uniform, thus having a function and use that enhances the sound absorption effect.

An apparatus for manufacturing an electrode plate of a secondary battery, the apparatus including a coating unit configured to coat a substrate with an electrode material, a roll pressing unit configured to press an electrode plate coated with the electrode material, and a drying unit configured to dry one of the electrode plate coated with the electrode material and a rolled electrode plate, wherein the drying unit includes a perforated plate with first air holes that are uniformly spaced and uniformly sized for applying heat air to the one of the electrode plate coated with the electrode material and the rolled electrode plate, and a screen with second air holes that are non-uniform, the screen configured to compensate for uneven airflow.

The utility model relates to the field of centrifugal fans, in particular to an exhaust silencer for a high-speed centrifugal fan, which comprises a straight silencer, a threaded connection groove and a silencing component. A silencing assembly used for reducing noise of the high-speed centrifugal machine is installed in the center of the interior of the straight-barrel silencer and comprises an air inlet, a threaded connection groove is formed in the position, located on the outer side of the air inlet, of the surface of the straight-barrel silencer, and the surface of the inner side of the straight-barrel silencer is wrapped with a perforated plate. A plurality of sets of first sound absorption holes used for increasing the propagation path length of sound waves and reducing sound energy are linearly formed in the surface of the perforated plate. According to the exhaust silencer for the high-speed centrifugal fan, due to the application of the multi-layer sound absorption material perforated plate, the fiber plate, the foamed plastic impedance layer and the silencing cotton, the sound energy can be reduced; the silencer can effectively reduce noise generated during operation of the high-speed centrifugal fan, the silencer is easy to mount and dismount due to the design of the threaded connection groove, and meanwhile, the stability of connection with the fan or other equipment is guaranteed.

The utility model discloses a buffering noise reduction assembly for a walnut production processing workshop conveyer belt feed inlet, which comprises a feed inlet, the feed inlet is fixedly connected on a conveyer belt, the whole feed inlet is a square frame body, openings at the upper end and the lower end of the frame body are gradually shrunk, and the opening at the lower end of the frame body is matched with spacing of separation baffles on the conveyer belt. The feeding port is formed by splicing connecting plates, and each connecting plate comprises a perforated plate layer, a noise reduction layer, a sound absorption layer and a sound insulation layer which are sequentially arranged from inside to outside. Through the combined design of the perforated plate layer, the noise reduction layer, the sound absorption layer and the sound insulation layer, noise generated when walnuts fall is effectively reduced, the working environment of a workshop is improved, and the hearing health of workers is protected; openings at the upper end and the lower end of the frame body are gradually shrunk, the upper end acts like a fence, the situation that walnuts jump out in the collision process can be reduced, scattering and waste of materials are avoided, and the lower end can adapt to falling of the walnuts and guide the walnuts to stably fall on a conveying belt.

The present application provides a pressure control device capable of eliminating flow rate variation of fluid caused by temperature, maintaining constant flow rate, a working method, and a substrate processing device. A pressure control device for fluid supplied to a substrate processing device using plasma according to the present application includes a fluid supply pipe forming a path for the fluid to flow, a control valve disposed at a flow inlet side of the fluid supply pipe, a flow meter measuring flow rate of the fluid flowing in the fluid supply pipe, a pressure gauge measuring pressure of the fluid flowing in the fluid supply pipe, and a valve controller controlling opening degree of the control valve. A perforated plate having a plurality of holes is disposed between the control valve and the flow meter in the fluid supply pipe. A temperature sensor measuring temperature of the fluid is provided at one side of the perforated plate.

The invention relates to the technical field of sound insulation structures, and discloses a sound insulation composite unit plate, a preparation method thereof and a sound insulation wallboard. The sound insulation composite unit plate comprises a unit plate, a layered spiral resonance structure, a perforated plate and a cotton felt layer clamped between the unit plate and the perforated plate. The layered spiral resonance structure is composed of a first spiral column and a second spiral column which are coaxially arranged in a sleeved mode and filled with sound absorption materials, and the spiral diameter of the first spiral column and the spiral diameter of the second spiral column are 15-25 mm and 25-45 mm respectively. The conical holes in the perforated plate are designed to be large in inlet and small in outlet. Through precise cooperation of the structure and parameters, the unit plate achieves efficient broadband sound absorption and high sound insulation performance within the low-frequency range of 100-500 Hz. The preparation method is simple in process, suitable for industrial mass production and high in percent of pass. The sound insulation wallboard is formed by flexibly combining a plurality of unit boards and has the remarkable advantages of being fast and convenient to install and convenient to transport and assemble on site, and the construction efficiency is greatly improved.

As shown in the reference diagram, this product is an indoor sound-absorbing board comprising a peripheral wall and a perforated plate, with a rear air layer defined by the peripheral wall and the perforated plate. The peripheral wall is positioned in the front, up / down, and left / right directions relative to the perforated plate. The rear air layer is defined by closing the opening in the peripheral wall with the perforated plate. The holes formed in the perforated plate are entry and exit points for sound to and from the rear air layer. The parts for which registration is sought are the left / right peripheral wall and the perforated plate (excluding the holes), and because the perforated plate is curved, multiple different resonance frequencies are set for each region where the depth (thickness) of the rear air layer is steplessly non-uniform, thus having a function and use that enhances the sound absorption effect.

The present application belongs to the technical field of low-frequency sound absorption, and discloses a micro-perforated panel composite gradient spiral pipe sound absorption device and method, which comprises a variable cross-section spiral pipe, the diameter of the inlet end of the variable cross-section spiral pipe is larger than the diameter of the outlet end of the variable cross-section spiral pipe; a plurality of MPP plates are installed in the variable cross-section spiral pipe, one of the MPP plates is embedded in the inlet end of the variable cross-section spiral pipe, and the other MPP plates are sequentially embedded in the inside of the variable cross-section spiral pipe at the same interval, forming a multi-stage MPP plate composite sound absorption structure; the cross-section pipe diameter of the variable cross-section spiral pipe linearly decreases from the inlet end of the variable cross-section spiral pipe to the outlet end of the variable cross-section spiral pipe. The gradient design of the variable cross-section spiral pipe integrated with the micro-perforated panel realizes low-frequency broadband high-efficiency sound absorption in a compact space, avoids the problem of heavy structure caused by the deep and large back cavity in the traditional technology, and overcomes the limitation of narrow sound absorption frequency band, and is especially suitable for space-limited occasions, and can balance the low-frequency performance and broadband characteristics in a limited space.

The invention discloses a perforated plate resonance structure capable of adaptively regulating and controlling sound absorption frequency. The perforated plate resonance structure comprises a perforated plate with a through hole and a hole shape regulating and controlling plug assembled with the through hole in a matched mode. The hole-shaped regulation and control plug comprises a hole-shaped regulation and control plug middle section penetrating through the through hole, and a hole-shaped regulation and control plug front cover plate and a hole-shaped regulation and control plug rear cover plate which are arranged at the two ends of the hole-shaped regulation and control plug middle section, and the cross section area of the hole-shaped regulation and control plug middle section is smaller than that of the through hole to form an annular seam; the cross sectional area of the front cover plate of the hole-shaped regulation and control plug and the cross sectional area of the rear cover plate of the hole-shaped regulation and control plug are both larger than the cross sectional area of the through hole, and the edges of the front cover plate of the hole-shaped regulation and control plug and the rear cover plate of the hole-shaped regulation and control plug are provided with supporting columns used for abutting against the perforated plate. The structure provided by the invention is good in sound absorption performance, long in service life, easy to process and capable of adaptively keeping the sound absorption frequency stable according to the environment temperature.

This invention discloses a perforated plate sound-absorbing structure with adjustable equivalent surface acoustic impedance (ESI). It includes a perforated panel, a cavity on the back of the panel, and a flexible sound-absorbing layer within the cavity. The flexible sound-absorbing layer is parallel to and always covers the back of the perforated panel. The flexible sound-absorbing layer has different flow resistivity distributions in different regions along its length. The flexible sound-absorbing layer is connected to a roller assembly to drive it to translate along its length. By aligning the different flow resistivity regions of the flexible sound-absorbing layer with the back of the perforated panel, the equivalent surface acoustic impedance of the perforated plate sound-absorbing structure can be adjusted. This solution achieves continuous and precise adjustment of the equivalent surface acoustic impedance by translating the flexible sound-absorbing layer, which always covers the back of the perforated panel and has a gradient or segmented flow resistivity distribution, thereby changing the corresponding positions of different flow resistivity regions on the back of the perforated panel. The adjustment accuracy is high, and it can meet the impedance matching requirements at different frequencies.

The invention discloses a low-resistance acoustic lining panel with elliptical holes and a design method thereof, the low-resistance acoustic lining panel comprises a perforated plate, a plurality of uniformly distributed through holes are formed in the perforated plate, the hole opening direction of the through holes is perpendicular to a fixed wall, and the through holes are elliptical holes; the short axis direction of the elliptical hole is the same as the airflow direction; the short axis length of the elliptical hole is greater than the thickness of the acoustic viscosity boundary layer corresponding to the target sound wave frequency; the elliptical holes are uniformly distributed in rows and columns on the fixed wall, and the elliptical holes in adjacent rows are distributed in a staggered manner, so that the elliptical holes in the middle row and the center connecting lines of the left and right adjacent elliptical holes in the front and back rows can form an equilateral triangle. According to the acoustic liner perforated plate, the hole shape of an existing acoustic liner perforated plate is changed into the oval shape from the original round shape, the size of the oval hole is designed, the flow resistance coefficient of the acoustic liner can be reduced on the premise that the overall acoustic performance of the acoustic liner is not changed, the considerable resistance reduction effect is achieved, and therefore oil consumption of an airplane can be reduced.

This invention provides a cavity-adjustable array micro-perforated sound absorber and its design method, belonging to the field of low-frequency vibration reduction and noise reduction. The sound absorber has a rectangular modular structure, consisting of an array of micro-perforated plates (assembled from multiple micro-perforated plates), a main frame, a sliding cavity plate assembly, and a rear-sealed large back plate, arranged sequentially along the sound wave incident direction. Here, and represent the number of rows and columns on one side of the independent cavity channels divided within the main frame. The perforated plates exhibit a perforation rate gradient distribution characteristic, and each cavity-adjustable sub-micro-perforated sound absorber has an effective cavity depth exhibiting an in-plane gradient distribution characteristic. Furthermore, the array of micro-perforated plates is arranged in a concentric matrix topology. This invention achieves extreme broadband impedance matching and targeted low-frequency absorption enhancement under finite thickness constraints by constructing an adjustable cavity, a dual-gradient evolution mechanism of perforation rate and cavity depth under constant aperture, and combining this with a concentric matrix topology arrangement radiating outwards from the low-frequency core.

The utility model belongs to the field of noise reduction technology discloses a kind of modular sound absorption structure, comprising: micro-perforated panel, micro-perforated panel rear upper and lower sides are respectively equipped with a group of rigid frame, and the rear of rigid frame is equipped with elastic backboard, and elastic backboard is bonded with rigid frame by viscoelastic material layer, cavity is formed between elastic backboard and micro-perforated panel, and sound-absorbing cotton is placed in cavity, and elastic backboard rear is equipped with constraint combination layer, compared with prior art, the utility model has the beneficial effects as follows: the through hole of micro-perforated panel is matched with cavity, and the absorption of medium-high frequency noise is enhanced;Cavity is combined with sound-absorbing cotton, improve low-frequency sound absorption capacity, realize broadband noise reduction, simultaneously, elastic backboard and viscoelastic material layer, constraint combination layer cooperate, through vibration damping and energy conversion, further improve the efficiency of noise reduction.

The invention provides a honeycomb plate / spinning composite sound absorption structure and a preparation method and application thereof.The honeycomb plate / spinning composite sound absorption structure comprises a substrate (1), a honeycomb plate (2), a TiO2 nanofiber layer (3) and a perforated plate (4) which are sequentially bonded from bottom to top, the thickness of the perforated plate is 0.5-0.8 mm, the hole diameter of perforated holes in the perforated plate is 0.8-1 mm, the hole pitch of the perforated holes is 2.5-3 mm, and the perforation rate is 8.48-9%; the thickness of the TiO2 nanofiber layer is 0.5 to 1mm, and the density of the TiO2 nanofiber layer is 0.016 to 0.024 g / cm < 3 >. The core function of the perforated plate in the honeycomb plate / spinning composite sound absorption structure is to trigger Helmholtz resonance; the TiO2 nanofiber layer is mainly used for micro energy consumption and porous sound absorption; the core function of the cellular board is to provide a rigid cavity and an additional acoustic effect; due to the existence of the base, the whole structure forms a closed structure, and the effects of light weight and high structural strength are achieved structurally.

As shown in the reference diagram, this product is an indoor sound-absorbing board comprising a peripheral wall and a perforated plate, with a rear air layer defined by the peripheral wall and the perforated plate. The peripheral wall is positioned in the front, up / down, and left / right directions relative to the perforated plate. The rear air layer is defined by closing the opening in the peripheral wall with the perforated plate. The holes formed in the perforated plate are entry and exit points for sound to and from the rear air layer. The parts for which registration is sought are the left / right peripheral wall and the perforated plate (excluding the holes), and because the perforated plate is curved, multiple different resonance frequencies are set for each region where the depth (thickness) of the rear air layer is steplessly non-uniform, thus having a function and use that enhances the sound absorption effect.

The application relates to a parameter determination method and device of a micro-perforated panel for spectrum noise reduction of intelligent electrical appliances, applied to the field of sound absorption and noise reduction, wherein the method comprises the following steps: determining a frequency attenuation curve of the micro-perforated panel based on initial parameters of the micro-perforated panel; obtaining original spectrum data of an intelligent electrical appliance to be reduced in noise; determining a filtering noise reduction amount according to the original spectrum data and the frequency attenuation curve; and predicting target parameters corresponding to a predicted noise reduction amount meeting a preset noise reduction threshold range in the micro-perforated panel based on a preset Bayesian optimization strategy and by using a target noise reduction prediction model. The target noise reduction prediction model is obtained by training a preset regression model based on the filtering noise reduction amount and the initial parameters of the micro-perforated panel, and is used for predicting filtering noise reduction amounts corresponding to different micro-perforated panel parameters. Through the application, the accuracy and efficiency of micro-perforated panel parameter design are improved.

The utility model relates to the technical field of silencers, in particular to a channel winding type silencer, which comprises a silencer outer cylinder and is characterized in that an outer winding silencing column group is arranged on the inner wall of the silencing column outer cylinder, an inner winding silencing column group is arranged on the inner wall of the outer winding silencing column group, a silencer inner cylinder is arranged in the center of the inner wall of the inner winding silencing column group, and a silencer outer cylinder is arranged on the inner wall of the silencer inner cylinder. According to the silencer, the long silencing channel is arranged, due to the fact that airflow rotates in the rotating channel, and on the premise that the length of the silencer is not changed, the length of the silencing channel of the silencer is longer, noise is repeatedly absorbed in the bent channel formed by the perforated plates, and the silencing effect is remarkable; due to the design of the winding channel, the pressure head loss of airflow is reduced, the pneumatic resistance is reduced, and the power loss is reduced; and the device is wide in applicability, can be suitable for noise treatment of various pipelines and high-noise airflow ports, and can also be applied to various industrial equipment such as petrochemical equipment, metallurgical equipment and energy equipment.

This application discloses a parametric generation and simulation optimization method for a double-layer rainproof and ventilated perforated panel. Based on the Grasshopper platform, a parametric geometry generation program for a double-layer rainproof and ventilated perforated panel is developed, which uses multiple closed curves to divide a single complete surface, and encapsulates it as an adjustable input battery pack. A wind tunnel field is created using Butterfly, and boundary conditions are configured. The mesh is generated and refined, and the data output results are solved and extracted. Repeated simulations are used to obtain the basic threshold range of the input parameters, and repeated experiments are conducted to expand the threshold range upwards and downwards. Cross-validation is performed using two inlet parameters: wind pressure and wind speed. A 3D model and performance report are output. This method enables digital simulation of small-scale porous structures using Butterfly; it avoids the limitation of the Butterfly mesh generation mechanism on the ratio between the perforated panel size and the hole size, ensuring that the computational model operates effectively within the feasible parameter range; and it constructs an integrated closed-loop process from parametric geometry generation to simulation optimization, reducing R&D costs and technical barriers.

The utility model discloses a self -noise formula chimney for RTO, specifically at RTO chimney field, chimney includes from top to bottom in proper order set up upper pipe, silencer pipe and lower pipe, and upper pipe and lower pipe all are arranged as funnel shape, the inside installation of silencer pipe has the acoustic lining of equidistance distribution of several layers, and the intercalation of several layers acoustic lining has the pipeline assembly, the inside installation of upper pipe has the upper flow guide spare of pipeline assembly intercommunication, the inside installation of lower pipe has the lower flow guide spare of pipeline assembly intercommunication. The utility model discloses through porous sound absorption board, perforated plate and multi -chamber structure cover broadband noise, utilize pipeline through -hole shunt and concentric circle sound -proof mechanism simultaneously and prolong the flue gas and sound wave propagation path, enhance the sound energy absorption and resonance cancellation effect.

A multi-gradient micro-perforated plate low-frequency broadband sound absorption structure based on a sound wave black hole effect belongs to the field of low-frequency vibration and noise reduction, is integrally cylindrical and consists of N micro-perforated plates, N connecting plate sleeves and a base, the micro-perforated plates and the connecting plate sleeves are sequentially arranged from top to bottom, the micro-perforated plate is arranged on the topmost layer, the micro-perforated plates are connected through the connecting plate sleeves, and the micro-perforated plate on the lowermost layer is connected with the base through the connecting plate sleeve. The aperture, the perforation rate and the plate distance of the designed micro-perforated plate are gradually changed layer by layer from top to bottom, a multi-gradient structure is formed, the sound wave black hole effect is introduced, the sound wave propagation speed is gradually reduced, the path is prolonged, and step-by-step gathering and dissipation of sound energy are achieved in combination with viscous damping and resonance effects; the base is used for preventing sound energy leakage and enhancing low-frequency absorption; the invention has the advantages of wide sound absorption frequency band, excellent low and medium frequency absorption performance, compact structure, controllable parameters, easy processing and modular combination, and is suitable for the engineering fields of noise control, architectural acoustics and the like.

The utility model relates to sound absorption structure technical field, concretely provides a kind of sound absorption composite board and building wall structure, the sound absorption composite board, including keel frame, the perforated magnesium oxysulfate board of being arranged in the one side of the keel frame, and the sound absorption material layer filled in the space between the keel frame and the magnesium oxysulfate board.It is the support body of composite board with keel frame, and incident sound wave enters sound absorption material layer by the perforation of the magnesium oxysulfate board and is absorbed.By limiting specific perforation rate and aperture, sound absorption effect can be significantly improved, and the sound absorption coefficient in 500~2000Hz can be greater than 0.7, effectively reduce noise, suitable for the place with requirement to acoustic performance.Meanwhile, using magnesium oxysulfate board as perforated panel, compared with traditional perforated panel, it has comprehensive advantages in fire prevention, moisture resistance, strength and economy, and is more convenient for popularization and application.

This invention relates to the field of sound insulation construction technology, and discloses a sound insulation composite unit panel, its preparation method, and a sound insulation wall panel. The sound insulation composite unit panel includes a unit panel, a layered spiral resonant structure, a perforated plate, and a cotton felt layer sandwiched between the two. The layered spiral resonant structure consists of a first spiral column and a second spiral column coaxially fitted and filled with sound-absorbing material, with spiral diameters of 15-25 mm and 25-45 mm, respectively. The conical holes on the perforated plate are designed with a large inlet and a small outlet. Through the precise matching of the above structure and parameters, this unit panel achieves efficient broadband sound absorption and high sound insulation performance in the 100-500Hz low-frequency range. Its preparation method is simple, suitable for industrial mass production, and has a high pass rate. The sound insulation wall panel is flexibly combined from multiple unit panels, offering significant advantages such as quick installation, convenient transportation, and on-site assembly, greatly improving construction efficiency.

A perforated plate (100) for a gas turbine combustion chamber (4), which is provided between a combustion chamber basket (47) and a combustion chamber housing (45) of the gas turbine combustion chamber (4) and is attached to an outer circumferential section of the combustion chamber basket (47), wherein, in a hole arrangement area (105) with a plurality of through holes (110) of the perforated plate (100), a section (108a) near the combustion chamber basket (47) has a larger mean value of a web ratio than a section (108b) near the combustion chamber housing (45), wherein the web ratio is obtained by dividing a distance (P2) between outer circumferential edges of two adjacent holes from the plurality of through holes (110) by a distance (P1) between the centers of the two holes, and wherein the perforated plate (100) has a radial distribution in which the web ratio increases at least in a subsection of the hole arrangement area (105) from a radial outside to a radial inside, characterized by the fact that in the radial distribution a second ratio is greater than a first ratio, where the first ratio is a ratio of the change in the web ratio to the change in the radial position in a first radial area (R1) and the second ratio is a ratio of the change in the web ratio to the change in the radial position in a second radial area (R2), which lies radially inwards of the first radial area (R1).

The application discloses a design method of an array silencer for adapting to a main ventilation air passage between a stator core of a hydro-generator and an air cooler and the array silencer, and relates to the technical field of suppressing or reducing the noise of a hydro-generator. The method comprises the following steps: S1, acquiring the aerodynamic noise data and airflow parameters of the main ventilation air passage; S2, determining the silencing idea and the core structure of the micro-perforated plate array according to the broadband vortex noise, discrete rotation, vortex shedding and surge noise; S3, determining the outer size and preliminarily calculating the airflow parameters; S4, designing the plate parameters in combination with the micro-perforated resonance formula; S5, simulating and optimizing; S6, accurately calculating the airflow parameters, and locking the scheme meeting the requirements; and the silencer comprises a shell and a plurality of micro-perforated plates, and the plurality of micro-perforated plates are arranged in series. The application does not use sound-absorbing materials, has low wind resistance (the wind volume attenuation is less than or equal to 5%, and the pressure loss is less than or equal to 200 Pa), reduces the main air passage noise by 5-7 dB(A), has long service life and low operation and maintenance cost, and is suitable for the requirements of the main air passage.

Rotational flow end plates are arranged on the rear side of a front wall plate of a barrel at intervals, a plurality of blade shafts are rotatably supported between the front wall plate of the barrel and the rotational flow end plates, rotational flow blades are installed on the blade shafts, blade wobble wheels are installed at the outward extending ends of the blade shafts, and the blade wobble wheels are installed on the front wall plate of the barrel. Each blade wobble wheel is meshed with the rotational flow driving wheel through a transmission ring; a front partition plate, a rear partition plate and a fixed perforated plate are sequentially installed in a barrel cavity of the silencer barrel from front to back at intervals, a perforated pipe is supported between the front partition plate and the rear partition plate, and a movable perforated plate is arranged on the front side face of the fixed perforated plate in a sliding mode. A resonant cavity movable partition plate is movably arranged in a cavity body of the resonant cavity, and the rear expansion cavity communicates with an air outlet pipe. According to the silencer, the throwing-out angle of spark carbon particles can be changed so as to adapt to the flow speed and flow of different exhaust gases, and the punching rate of the penetrating plate and the volume of the resonant cavity can be changed so as to meet the requirement for broadband noise elimination and noise reduction.

A device for cleaning the regenerator (2) filling for burner systems using vibratory screening for separating the regenerator (2) filling, with the principle of the solution being that the device comprises a complex assembly of interconnected parts of a tilting frame (1), a regenerator (2), a hopper (3), a vibratory screener (4), a collecting box (5), a transport box (6), an exhaust assembly (7) and a control system (8), around which the frame structure (9) is arranged, wherein - the upper face (11) of the tilting frame (1) is mounted in a unilateral tilting manner and is equipped with guiding elements (16) to enable the regenerator body (2) to be mounted, - the regenerator (2) consists of an insulated cased box, which features a discharge hole (22) located on the side wall (21) to allow the filling to be emptied, - in front of the side wall (21) of the regenerator body (2), a hopper (3) in the shape of a downward tapering trough is placed below the level of its bottom (23), - under the hopper (3) there is a vibratory screener (4) consisting of a base (41) above which a vibrating table (42) is mounted, consisting of a perforated sheet (421) arranged in the inclined plane position, - below the level of the trailing edge (422) of the perforated sheet (421) a transport box (6) is placed for collecting cleaned heat carriers, - the base (41) of the vibratory screener (4) is adapted for the passage of waste particles from the cleaning process falling under the perforated sheet (421), where the collecting box (5) is placed, - the regenerator (2), hopper (3), vibratory screener (4) and collecting box (5) are equipped with suction holes or suction throats (71) connected to branches of the air bleeding pipe (72) of the exhaust assembly (7), - the control system (8) is centralized in a switchboard (81), which is preferably equipped with programmable industrial controllers connected to the control and steering parts of the device components, namely the tilting frame (1 ), hopper (3), vibratory screener (4) and the exhaust assembly (7).