Integrated silencing grille door

Abstract

The invention relates to an integrated silencing grille door, and belongs to the technical field of industrial noise control and ventilation equipment. The grille door comprises a door frame assembly, a grille assembly, a composite sound absorption assembly and an intelligent control assembly. The door frame assembly is connected with a wall through a nitrile rubber damping rubber mat, and a modular interface is reserved to be matched with a special-shaped door opening. According to the grating assembly, grating blades are driven to rotate through a rope-rope wheel transmission system, and opening adjustment is achieved. The composite sound absorption assembly comprises a metal cover, a metal framework and three sound insulation layers (rock wool, a damping sound insulation plate and hydrophobic glass fiber cotton), and the noise path is prolonged through honeycomb-shaped protrusions. The intelligent control assembly monitors in real time through the noise sensor, the microcontroller controls the motor to adjust the blade angle according to the noise frequency band, medium-high frequency noise is mainly used for horizontal wide-angle ventilation of the blade, and low-frequency noise is mainly used for the blade in a 45-degree silent mode. According to the invention, 100-4000 Hz full-band noise reduction is realized, and the ventilation efficiency, vibration isolation and intelligent regulation and control functions are realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of acoustic shielding and intelligent noise control, in particular to an integrated sound attenuation grille door, especially suitable for special scenes such as ship engine room, nuclear power plant ventilation room, industrial fan room, etc., which can ensure the efficiency of fan inlet and outlet and the maintenance passage, and realize full-band air noise suppression and vibration isolation. It belongs to the cross technical field of industrial noise control and ventilation equipment. BACKGROUND

[0002] In the ventilation system of ship, nuclear power and other fields, fans are widely used as power sources, and the air noise generated by their operation has become a key factor affecting personnel comfort. At present, the industry generally reduces noise by installing sound attenuators on the ventilation pipeline, but in the scene where the fan inlet / outlet directly interfaces with air and there is no pipeline sound attenuator installation space (such as ship engine room air supply fan, nuclear power plant ventilation fan), noise control still relies on fan sound shields or special fan rooms.

[0003] However, the existing technology has the following significant defects:

[0004] (1) Noise leakage and frequency limitation: The ventilation openings and maintenance doors of the fan sound shield and the fan room provide a direct channel for air noise, and the existing sound attenuation structure mostly uses a single sound-absorbing material (such as rock wool), which only has a certain inhibitory effect on medium and high frequency noise, and has insufficient attenuation for the core low frequency noise (100-200Hz) of the fan, which cannot meet the requirements of the "Industrial Enterprise Plant Boundary Environmental Noise Emission Standard" (GB12348-2008);

[0005] (2) Poor adaptability to harsh environments: the grille is easily blocked by industrial dust, reducing ventilation efficiency; and there are no vibration reduction measures between the door frame and the wall, the metal cover and the grille, and the fan vibration is transmitted through the structure to generate additional noise;

[0006] (3) Insufficient maintenance and adaptability: the grille and door frame are mostly welded and fixed, and need to be disassembled as a whole for later cleaning or replacement; the sound-absorbing material needs to be disassembled from the metal cover, resulting in high maintenance cost; at the same time, the door body structure is fixed and cannot adapt to the irregular door hole (such as circular, large size double door) in scenes such as ships, nuclear power plants, etc., and it is also difficult to switch functions such as mosquito prevention and filtration according to different scenes;

[0007] (4) Lack of intelligent regulation and control: unable to monitor environmental noise in real time, ventilation volume and noise reduction demand cannot be dynamically matched, there is a contradiction between "excessive noise reduction leading to insufficient ventilation" and "ventilation priority leading to noise exceeding standard".

[0008] Therefore, an integrated sound attenuation grille door is needed, which has full-band noise reduction, harsh environment adaptability, convenient maintenance and intelligent adaptation, to solve the comprehensive defects of the existing technology. SUMMARY

[0009] (One) device composition

[0010] The integrated sound attenuation grille door takes "modular integration, full-link noise reduction, intelligent adaptation" as the core, mainly includes door frame assembly, grille assembly, composite sound absorption assembly, intelligent control assembly, and each component cooperates to realize ventilation, maintenance, sound attenuation, vibration reduction and intelligent control function, and the specific structure is as follows:

[0011] (1) Door frame assembly: Q235B cold-rolled steel plate is bent and formed, nitrile rubber damping rubber pad is pasted between the door frame and the installation wall, the gap between the door frame and the wall is controlled at 2-3mm during installation, and the vibration transmission path is blocked; The door frame reserves a modular interface, which supports double-door, single-door, round door, rectangular door and other structure forms, and adapts to different scene door hole requirements;

[0012] (2) Grille assembly: including grille support frame, grille body, grille drive assembly and other core components.

[0013] 1. The grille support frame includes two stainless steel grille support columns and a grille top mounting box and a grille bottom mounting box. The top of the grille support column is welded and fixed with the grille top mounting box, and the bottom is welded and fixed with the grille bottom mounting box. The top surface of the grille top mounting box is provided with a maintenance cover, which is convenient for maintenance of the wire rope, the driving wheel, the driving single gear, the driven wheel and the motor. The inner wall of the grille top mounting box can be coated with sound insulation material to realize sound attenuation of the grille drive assembly. The bottom surface of the grille top mounting box and the top surface of the grille bottom mounting box are provided with rope passing holes, the size of the rope passing holes is matched with the wire rope, which can ensure smooth lifting of the wire rope, and facilitate wire rope passing and sound attenuation of the grille top mounting box and the bottom mounting box. The grille support frame is detachably connected with the door frame through plastic buckle + positioning bolt, and the outer side of the buckle is provided with a sealing ring.

[0014] 2. The grille body includes a grille shaft and a grille blade. The grille shaft is fixed between the left and right two grille support columns through a shaft sleeve and can rotate. The grille shaft is also welded with the grille blade.

[0015] 3. The grid drive assembly includes a drive shaft, drive reel, reels, ropes, driven single gear, drive wheel, motor, fixed ring, driven reel, and driven shaft. The drive shaft is fixed between the left and right side walls of the grid top mounting box via bushings and allows rotation. A driven single gear is located at the center of the drive shaft, and drive reels are symmetrically arranged at both ends of the drive shaft. The driven single gear has only one tooth, which meshes with a single tooth groove on the drive wheel. The drive wheel is driven by the motor, which drives the meshing driven single gear to rotate, thereby driving the drive shaft and drive reels to rotate synchronously. The motor base is fixed to the bottom plate of the grid top mounting box. Several reels are arranged along the center line of the upper curved surface of the drive reel, allowing the ropes to be knotted or fixed to the reels for securing. The driven shaft is fixed between the left and right side walls of the grid bottom mounting box via bushings and allows rotation. Driven reels are symmetrically arranged at both ends of the driven shaft. Several loops are set along the center line of the lower half-curved surface of the driven sheave. The rope can be fixed by tying knots on the loops. Two ropes are set, each rope passing through each grid blade. The ropes are fixed to each grid blade by the fixing loops, and then pass around the driving sheave and the driven sheave to form a rope-sheave-grid blade transmission system.

[0016] (3) The composite sound-absorbing component includes a metal cover, a metal frame, and a sound insulation layer.

[0017] The metal enclosure is made of cold-rolled steel sheet stamped into a door frame shape, and is detachably connected to the door frame via plastic clips and positioning bolts. A sealing ring is provided on the outside of the clips. The inner wall of the metal enclosure is stamped with honeycomb-shaped protrusions to increase the sound absorption area. Nitrile rubber sealing gaskets are added to the detachable connection points between the metal enclosure and the door frame to reduce vibration-induced sound transmission. A metal frame is installed in the middle of the metal enclosure, dividing it into multiple sound insulation compartments. The sound insulation layer is located within these compartments and employs a three-layer composite structure: an inner layer of rock wool, a middle layer of thick nitrile rubber damping sound insulation board (with the aluminum foil composite layer facing outwards), and an outer layer of hydrophobic glass fiber cotton (sound-absorbing and environmentally friendly, suitable for high-temperature environments such as ship engine rooms and nuclear power plants, preventing high-temperature failure of sound-absorbing materials).

[0018] (4) Intelligent control components: including noise sensors and microcontrollers installed on the outside of the grille assembly; the microcontrollers are connected to the noise sensors and motors respectively to realize parameter monitoring and dynamic control.

[0019] (II) Working Principle

[0020] (1) Full-band noise reduction principle:

[0021] 1. After airborne noise enters the metal enclosure, the honeycomb protrusions extend the noise propagation path. The inner layer of the composite sound-absorbing component, made of rock wool, absorbs mid-to-high frequency noise. The middle layer of damping sound insulation board consumes low-frequency noise energy through shear deformation. The outer layer of hydrophobic glass fiber cotton further absorbs residual noise. The three layers work together to achieve noise reduction in the 100-4000Hz frequency band.

[0022] 2. When air noise passes through the grille, the mid-to-high frequency noise is further attenuated by the resonance of the grille blades.

[0023] (2) Vibration isolation principle: The damping pads between the door frame and the wall, and the sealing pads between the metal cover and the grille form a double vibration buffer, which absorbs the vibration energy transmitted by the fan through elastic deformation and blocks the solid sound transmission path;

[0024] (3) Intelligent Adaptation Principle: The noise sensor monitors the ambient noise in real time. When the noise > 60dB, the microcontroller triggers the motor.

[0025] For wide-angle ventilation, the microcontroller controls the motor to rotate forward, which drives the driving wheel to mesh with the driven single gear. This drives the driven single gear to rotate; for every one revolution of the driving wheel, the driven single gear rotates a certain angle. This angle of rotation is designed to match the rotation angle of the grille blades. The driven single gear drives the driving pulley to rotate via the driving shaft. Since the cable is fixed to the driving pulley, its rotation pulls the driven pulley, causing the individual grille blades fixed to the cable to rotate around the grille axis to a horizontally parallel position. This increases the grille blade opening, achieving wide-angle ventilation.

[0026] In silent mode, the microcontroller controls the motor to reverse, which in turn drives the driving wheel to mesh with the driven single gear. Each full rotation of the driving wheel causes the driven single gear to rotate at the same angle. The driving wheel drives the driven single gear to rotate in reverse, which in turn drives the driving sheave to rotate in reverse. Since the wire rope is fixed to the driving sheave, the rotation of the driving sheave pulls the driven sheave to rotate. Consequently, the individual grid blades fixed to the wire rope also rotate around the grid axis to a position at a certain angle to the horizontal, thus reducing the opening of the grid blades and achieving silent mode.

[0027] (4) Multi-scene adaptation principle: Through modular interfaces, the grille and door frame structure can be quickly replaced, such as replacing the industrial scene with a dustproof net, the residential scene with a mosquito net, and the irregular door opening with a round door / double door structure to meet the needs of different fields such as ships, nuclear power, and construction.

[0028] (III) Work Process

[0029] (1) Installation phase:

[0030] 1. Select the door frame structure according to the needs of the scenario (e.g., choose a round door for the ship's engine room). If it is a high-temperature scenario, attach alkali-free, water-repellent, high-temperature resistant fiberglass cloth to the outside of the sound insulation layer.

[0031] 2. Secure the door frame assembly to the wall using expansion bolts, ensuring a tight fit between the door frame and the wall, and fully compact the nitrile rubber vibration damping pads. Connect the grille assembly to the door frame using clips and positioning bolts. Secure the metal cover of the composite sound insulation assembly to the door frame using clips and positioning bolts (with sealing gaskets). Finally, install the intelligent control assembly to complete the overall assembly.

[0032] (2) Operation phase:

[0033] 1. After the fan starts, the noise sensor collects data in real time and transmits it to the microcontroller; when the noise level is detected to be >60dB, the microcontroller triggers corresponding adjustments based on the noise frequency band:

[0034] When mid-to-high frequency noise (500-4000Hz) is predominant, wide-angle ventilation is required. A microcontroller controls the motor to rotate forward, driving the drive wheel to mesh with the driven single gear. This drives the driven single gear to rotate; for every one revolution of the drive wheel, the driven single gear rotates a certain angle. This angle of rotation is designed to match the rotation angle of the grille blades. The driven single gear drives the drive pulley via the drive shaft. Since the rope is fixed to the drive pulley, its rotation pulls the driven pulley, causing the individual grille blades fixed to the rope to rotate around the grille axis to a horizontally parallel position. This increases the grille blade opening, achieving wide-angle ventilation. Simultaneously, the composite sound-absorbing components absorb noise through the honeycomb protrusions of the metal cover and the sound insulation layer.

[0035] When low-frequency noise (100-200Hz) is predominant, a silent mode is required. The microcontroller controls the motor to reverse, thereby driving the drive wheel to mesh with the driven single gear. For every one revolution of the drive wheel, the driven single gear reverses by a certain angle, the same angle for both forward and reverse rotation. The drive wheel drives the driven single gear to reverse, which in turn drives the drive sheave to reverse. Since the wire rope is fixed to the drive sheave, the reverse rotation of the drive sheave pulls the driven sheave to rotate. Consequently, the individual grid blades fixed to the wire rope also rotate around the grid axis to a position at a certain angle (e.g., 45°) to the horizontal, thus reducing the opening of the grid blades and achieving silent mode.

[0036] (iv) Beneficial effects

[0037] (1) Significant noise suppression effect across the entire frequency band

[0038] This invention achieves highly efficient absorption of airborne noise across a wide frequency range of 100-4000Hz through the synergistic effect of a three-layer composite sound-absorbing component (inner layer rock wool, middle layer damping sound insulation board, and outer layer hydrophobic glass fiber wool). Specifically, the rock wool absorbs mid-to-high frequency noise (500-4000Hz), the damping sound insulation board dissipates low-frequency noise (100-200Hz) energy through shear deformation, and the hydrophobic glass fiber wool further absorbs residual noise and adapts to high-temperature environments. Furthermore, the honeycomb-shaped protrusions on the inner wall of the metal enclosure extend the noise propagation path, and the grid blades further attenuate mid-to-high frequency noise through resonance, thus comprehensively covering the frequency band required by industrial noise standards (such as GB12348-2008), overcoming the frequency band limitations of existing technologies.

[0039] (2) Excellent vibration isolation and structural sound transmission blocking effect

[0040] A nitrile rubber vibration damping pad is installed between the door frame assembly and the mounting wall, and a sealing gasket is added at the connection between the metal cover and the door frame, forming a double vibration buffer layer. This design absorbs the vibration energy transmitted by the fan through elastic deformation, effectively blocking the solid-borne sound transmission path and reducing additional noise generation. Compared with traditional welding fixing methods, this invention significantly improves adaptability to harsh environments (such as ship engine rooms and nuclear power plants) and avoids performance degradation caused by vibration.

[0041] (3) Intelligent dynamic regulation optimizes the balance between ventilation and noise reduction

[0042] Ambient noise is monitored in real time by noise sensors, and the microcontroller automatically triggers the motor to adjust the opening of the grille blades based on the noise level (e.g., >60dB). When mid-to-high frequency noise is predominant, the motor rotates forward to drive the grille blades to a horizontal position, achieving wide-angle ventilation and ensuring ventilation efficiency. When low-frequency noise is predominant, the motor rotates in reverse to bring the grille blades to a certain angle, reducing the opening and entering a silent mode. This intelligent adaptation avoids the contradiction of "excessive noise reduction leading to insufficient ventilation" or "ventilation priority leading to excessive noise," achieving a dynamic match between ventilation volume and noise reduction requirements.

[0043] (4) Modular design improves adaptability to multiple scenarios and ease of maintenance.

[0044] The door frame assembly features pre-installed modular interfaces, supporting various structural forms such as double doors, single doors, and round doors. It allows for quick replacement of grilles or additional functional modules (e.g., dustproof nets for industrial applications and mosquito nets for residential applications). The grille assembly and metal cover are detachably connected to positioning bolts via plastic clips. Sealing rings on the outside of the clips facilitate cleaning, replacement of sound-absorbing materials, and maintenance of drive components, reducing operating costs. This design overcomes the problems of fixed structures and poor adaptability in existing technologies, meeting the needs of irregularly shaped doorways in applications such as shipbuilding, nuclear power plants, and buildings.

[0045] (5) Enhanced environmental adaptability and durability

[0046] The outer layer of the composite sound-absorbing component, made of hydrophobic glass fiber cotton, possesses high-temperature resistance, preventing the sound-absorbing material from failing in high-temperature environments (such as ship engine rooms). The metal cover is made of cold-rolled steel sheet through stamping, and the grille support frame is made of stainless steel, enhancing corrosion resistance and anti-clogging capabilities. The overall structure employs a sealed design to reduce dust intrusion, ensuring long-term ventilation efficiency and extending service life. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of the structure of the present invention during wide-angle ventilation.

[0048] Figure 2 This is a schematic diagram of the silent mode of the present invention.

[0049] Figure 3 This is a schematic diagram of the grille assembly structure of the present invention. Figure 1 .

[0050] Figure 4 This is a schematic diagram of the grille assembly structure of the present invention. Figure 2 .

[0051] Figure 5 This is a schematic diagram of the composite sound-absorbing component structure of the present invention.

[0052] Figure 6 This is a schematic diagram of the transmission between the driving wheel and the driven single gear of the present invention.

[0053] Reference numerals: Grille support column-101, Grille top mounting box-102, Grille bottom mounting box-103, Grille rotating shaft-104, Grille blade-105, Drive shaft-106, Drive reel-107, Wire loop-108, Wire rope-109, Driven single gear-110, Drive wheel-111, Motor-112, Inspection cover-113, Rope hole-114, Fixing ring-115, Driven reel-116, Driven shaft-117, Door frame-2, Metal cover-301, Metal frame-302, Sound insulation layer-303 Detailed Implementation

[0054] The integrated soundproof grille door of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is only used to explain the present invention and is not intended to limit the scope of protection of the present invention.

[0055] I. Overall Structure Overview

[0056] This integrated sound-absorbing grille door is mainly composed of a door frame assembly, a grille assembly, a composite sound-absorbing assembly, and an intelligent control assembly. These components work together through a modular design to achieve ventilation, sound absorption, vibration reduction, and intelligent control functions. The overall structure is as follows: Figure 1 As shown, the layout is displayed in wide-angle ventilation mode; Figure 2The structural changes in silent mode demonstrate the collaborative relationship between components under controlled conditions.

[0057] II. Component Preparation and Selection

[0058] (I) Door frame assembly preparation

[0059] Using Q235B cold-rolled steel sheet as the base material, it is bent into shape according to preset dimensions using a CNC bending machine to form a door frame structure suitable for the target scene's doorway (in this embodiment, a round door structure can be selected to meet the requirements of irregular doorways in ship engine rooms). On the contact surface between the door frame and the mounting wall, nitrile rubber vibration damping pads are fixed with adhesive backing, with a pad thickness of 5mm, ensuring that the gap between the door frame and the wall is controlled at 2-3mm after installation. The door frame has pre-reserved modular interfaces, with positioning holes and snap-fit ​​grooves machined at the interfaces for detachable connection with grille components and composite sound-absorbing components.

[0060] (2) Manufacturing and assembly of grid components

[0061] The grille assembly includes a grille support frame, a grille body, and a grille drive assembly.

[0062] Grille support frame: Stainless steel grille support columns (101) are used, with the top welded to the top mounting box (102) and the bottom welded to the bottom mounting box (103). An inspection cover (113) is provided on the top surface of the top mounting box for easy maintenance of internal components; the inner wall of the top mounting box is lined with sound-insulating material (such as rock wool) with a thickness of 10mm. Rope holes (114) are provided on the bottom surface of the top mounting box and the top surface of the bottom mounting box, with the hole diameter matching the diameter of the rope (109) (e.g., φ5mm) to ensure smooth rope movement. The support frame is detachably connected to the door frame via plastic clips and positioning bolts. A nitrile rubber sealing ring is added to the outside of the clips to prevent noise leakage.

[0063] Grille body: The grille shaft (104) is fixed between the left and right grille support columns by a bushing, and the shaft can rotate; the grille blades (105) are welded to the grille shaft (104), and the grille shaft spacing is designed to be 100mm to ensure that the grille blades (105) rotate without interference, so as to balance the ventilation and noise reduction requirements.

[0064] The grid drive assembly consists of a drive shaft (106) fixed to the side wall of the top mounting box of the grid via a bushing. A driven single gear (110) with only one tooth is mounted at the center of the shaft. Drive pulleys (107) are symmetrically mounted at both ends of the drive shaft, with a wire ring (108) on the upper half of the pulley for fixing the wire rope. The driven shaft (117) is fixed to the side wall of the bottom mounting box of the grid via a bushing. Driven pulleys (116) are mounted at both ends, with a wire ring on the lower half of the pulley. The base of the motor (112) is fixed to the bottom plate of the top mounting box of the grid. The output shaft of the motor is connected to the drive wheel (111), which has a single tooth groove that meshes with the driven single gear. There are two wire ropes (109), each passing through each grid blade. Two fixing rings (115) are installed on each grid blade to fix the two wire ropes. The ropes then pass around the drive pulley and the driven pulley to form a closed-loop transmission system. During assembly, first install the support frame, then fix the grid shaft and grid blades, and finally tension the rope to form a rope-reel-grid blade transmission system to ensure smooth transmission. Figure 3 and Figure 4 The structural details of the grille assembly are shown.

[0065] (3) Manufacturing and installation of composite sound-absorbing components

[0066] The metal enclosure (301) is made of cold-rolled steel sheet stamped into a door frame shape, with honeycomb-shaped protrusions stamped on the inner wall (protrusion height 5mm, spacing 10mm) to increase the sound absorption area. A metal frame (302) is welded in the middle of the metal enclosure, dividing the interior into multiple sound insulation compartments (each compartment is 200mm×200mm). The sound insulation layer (303) is filled in the sound insulation compartments, using a three-layer composite structure: the inner layer is rock wool (density 80kg / m³). 3 The metal cover consists of a 30mm thick outer layer, a 10mm thick nitrile rubber damping sound insulation board (aluminum foil composite layer facing outwards), and an outer layer of water-repellent fiberglass wool (20mm thick). The metal cover is detachably connected to the door frame via plastic clips and positioning bolts, with nitrile rubber sealing gaskets installed at the connection points. During installation, first fill the sound insulation layers into the sound insulation grid in sequence, then secure the metal cover with the clips, ensuring the sealing gaskets are compressed evenly. Figure 5 The structure of the composite sound-absorbing component is shown.

[0067] (4) Integration of intelligent control components

[0068] A noise sensor is installed in the center of the outer side of the grille assembly, 100mm from the door frame, to monitor ambient noise in real time. The microcontroller is fixed in the junction box inside the control box (102) on the top of the grille, and is connected to the noise sensor and the motor via cables. The microcontroller has a preset control program: when the noise sensor detects a value >60dB, the motor is triggered; the program distinguishes between mid-to-high frequency (500-4000Hz) and low-frequency (100-200Hz) noise based on the noise frequency band (through FFT analysis), corresponding to wide-angle ventilation and silent mode, respectively.

[0069] III. Installation Process

[0070] The installation phase is customized according to the specific needs of the scenario:

[0071] Step 1: Select the door frame structure. For example, when the engine room door opening of a ship is circular, a round door frame is selected; in high-temperature scenarios (such as nuclear power plants), an additional alkali-free, water-repellent, high-temperature resistant fiberglass cloth (2mm thick) is pasted on the outside of the sound insulation layer.

[0072] Step 2: Fix the door frame assembly to the installation wall with expansion bolts, ensuring that the door frame fits tightly against the wall, and fully compact the nitrile rubber vibration damping pads, with the gap controlled at 2-3mm.

[0073] Step 3: The grille assembly is connected to the door frame by clips and positioning bolts. Adjust the tension of the rope to make the grille blades rotate flexibly.

[0074] Step 4: Secure the metal cover of the composite sound-absorbing component to the door frame with clips (with sealing gaskets) and check the sealing of all connections.

[0075] Step 5: Install the intelligent control components, connect the sensors and motor circuits, and conduct a power-on test.

[0076] IV. Operation and Control

[0077] (1) After the fan is started, the noise sensor collects environmental noise data in real time and transmits it to the microcontroller for analysis and processing.

[0078] (2) When the microcontroller detects noise ≤60dB, the device maintains its initial state and the grid blades are in the initial position of silent mode at 45° to the horizontal.

[0079] (3) When the detected noise is >60dB, the microcontroller further determines the noise frequency band:

[0080] If the proportion of mid-to-high frequency noise (500-4000Hz) is ≥70%, the wide-angle ventilation mode is triggered: the microcontroller sends a forward rotation signal to the stepper motor, the motor drives the drive wheel to rotate, the drive wheel rotates one revolution forward, driving the meshing driven single gear to rotate 30° forward (this angle is adapted to the rotation angle of the grille blades), the driven single gear drives the drive pulley to rotate synchronously through the drive shaft, the rope pulls the driven pulley to rotate, and then drives all the grille blades to rotate around the grille axis to a position parallel to the horizontal, increasing the ventilation volume; at the same time, the composite sound absorption component extends the noise propagation path through the honeycomb protrusions of the metal cover, and the three layers of sound insulation layer work together to absorb mid-to-high frequency noise.

[0081] If low-frequency noise (100-200Hz) accounts for ≥70%, the silent mode is triggered: the microcontroller sends a reverse signal to the stepper motor, the motor drives the active wheel to reverse one revolution, which drives the driven single gear to reverse 30°, and the active wheel reverses to pull the grid blades around the axis to a position of 45° with the horizontal through the rope, reducing the blade opening; the middle layer of nitrile rubber damping sound insulation board consumes low-frequency noise energy through shear deformation, and the inner layer of rock wool and the outer layer of water-repellent glass fiber wool absorb residual noise to achieve a silent effect.

[0082] Transmission mechanism such as Figure 6 As shown, ensure the movements are precise.

[0083] V. Maintenance and Replacement

[0084] (1) Grille cleaning: When the grille is clogged with dust, loosen the positioning bolts, remove the grille assembly, and directly rinse or wipe the grille blades. There is no need to disassemble the entire door. After cleaning, simply reinstall it.

[0085] (2) Replacement of sound-absorbing material: Unscrew the positioning bolts of the composite sound-absorbing component, remove the metal cover, take out the old sound insulation layer, replace the new sound-absorbing material according to the "three-layer composite structure", and then reinstall the metal cover and fix it.

[0086] (3) Drive component maintenance: Open the maintenance cover of the top mounting box of the grille to directly inspect, adjust or replace components such as the rope, drive wheel, driven single gear, and motor without disassembling the grille body.

[0087] (4) Scene adaptation and switching: If the door structure needs to be changed (e.g., from a round door to a double door), loosen the fixing bolts between the door frame and the wall, replace the door frame component with the corresponding structure, and then reassemble the other parts; if the function module needs to be switched (e.g., from a dustproof net to a mosquito net), remove the original grille component and replace it with a grille body with the corresponding function net.

[0088] VI. Optional Implementation Methods

[0089] To adapt to multiple scenarios, components can be quickly replaced via modular interfaces:

[0090] Industrial dust scenario: Replace the grid assembly with a dustproof mesh module with a mesh size of 1mm×1mm.

[0091] Residential scenario: Replace with mosquito netting (0.5mm x 0.5mm mesh).

[0092] Irregular door openings: Door frame interfaces support non-standard sizes, such as large double doors, which can be achieved through customized bending processes.

[0093] VII. Effect Verification

[0094] This specific implementation method ensures full-band noise suppression (100-4000Hz), vibration isolation, intelligent control, and ease of maintenance through the above steps.

Claims

1. An integrated sound-absorbing grille door, characterized in that, This includes door frame components, grille components, composite sound-absorbing components, and intelligent control components; The door frame assembly is connected to the mounting wall via vibration-damping rubber pads and is equipped with modular interfaces; The grille assembly includes a grille support frame, a grille body, and a grille drive assembly. The grille support frame is detachably connected to the door frame assembly, and the grille body adjusts the blade opening through the grille drive assembly. The composite sound-absorbing component includes a metal cover, a metal frame, and a sound insulation layer. The metal cover is detachably connected to the door frame component, and the sound insulation layer is disposed within the sound insulation compartments separated by the metal frame. The intelligent control component includes a noise sensor and a microcontroller. The microcontroller controls the operation of the grille drive component based on the monitoring data from the noise sensor, thereby achieving dynamic regulation of ventilation and noise reduction.

2. The integrated sound-absorbing grille door according to claim 1, characterized in that, The door frame assembly is formed by bending cold-rolled steel plate, and nitrile rubber vibration damping pads are provided between the door frame and the wall, with the installation gap controlled at 2-3mm; the modular interface supports double door, single door, round door or rectangular door structure.

3. The integrated sound-absorbing grille door according to claim 1, characterized in that, The grid support frame includes a grid support column, a grid top mounting box and a grid bottom mounting box. The top surface of the grid top mounting box is provided with an inspection cover, and the bottom surface of the box and the top surface of the grid bottom mounting box are provided with rope holes. The grid body includes a grid shaft and grid blades welded thereon; The grid drive assembly includes a drive shaft, a drive pulley, a rope, a driven single gear, a drive wheel, a motor, a driven pulley, and a driven shaft. The rope passes around the drive pulley and the driven pulley and is connected to each grid blade through a fixing ring to form a rope-pulley transmission system.

4. The integrated sound-absorbing grille door according to claim 3, characterized in that, The driven single gear has only one tooth, which meshes with the single tooth groove of the driving wheel; the driving wheel is driven by a motor, and each rotation of the driving wheel causes the driven single gear to rotate by a specific angle, which in turn drives the driving wheel to rotate through the driving shaft, thereby realizing the angle adjustment of the grid blades.

5. The integrated sound-absorbing grille door according to claim 3, characterized in that, The grille blades have two working positions: when the noise sensor detects that mid-to-high frequency noise is dominant, the grille blades rotate to a wide-angle ventilation position parallel to the horizontal; when low-frequency noise is dominant, the grille blades rotate to a silent position at 45° to the horizontal.

6. The integrated sound-absorbing grille door according to claim 1, characterized in that, The inner wall of the metal cover of the composite sound-absorbing component is stamped with honeycomb-shaped protrusions, and a metal skeleton is provided in the middle to form multiple sound insulation compartments. The sound insulation layer is a three-layer composite structure, with rock wool as the inner layer, nitrile rubber damping sound insulation board as the middle layer, and water-repellent glass fiber cotton as the outer layer.

7. The integrated sound-absorbing grille door according to claim 6, characterized in that, The metal cover is detachably connected to the door frame via plastic clips and positioning bolts, and a sealing gasket is provided at the connection point; the water-repellent glass fiber cotton in the sound insulation layer is replaced with alkali-free water-repellent high-temperature resistant glass fiber cloth in high-temperature scenarios.

8. The integrated sound-absorbing grille door according to claim 1, characterized in that, The noise sensor of the intelligent control component is located on the outside of the grille component. The microcontroller has a pre-set noise frequency band analysis program, which triggers the motor to operate when the noise level is >60dB. For mid-to-high frequency noise in the 500-4000Hz range, the motor is controlled to rotate forward to open the grille blades to a wide-angle ventilation position; for low-frequency noise in the 100-200Hz range, the motor is controlled to rotate in reverse to open the grille blades to a silent position.

9. The integrated sound-absorbing grille door according to claim 1, characterized in that, The grille blades in the grille assembly can be replaced with dustproof netting or mosquito netting modules, and the door frame assembly can be replaced with a round door or double door structure according to the requirements of irregular door openings.

10. The integrated sound-absorbing grille door according to claim 3, characterized in that, The maintenance cover of the grid drive assembly is located on the top surface of the mounting box on the top of the grid, and is used for maintenance or replacement of the rope, drive pulley, driven single gear and motor.

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