Ventilation device with a silent air duct

Abstract

This application relates to the field of ventilation electrical appliances, and in particular to a ventilation device with a silent air duct, comprising a housing, a volute air duct, and a fan assembly. The housing inlet end is equipped with a detachable composite filter module that achieves layered interception of sand and dust and allows for tool-free quick removal. The inner wall of the volute air duct, where the airflow turns, is embedded with noise-reducing components to eliminate eddies and resonance noise within the duct. Adaptive sealing components are provided at the joints of the panels of the housing to compensate for gaps in the housing joints and prevent sand and dust leakage. The volute air duct inlet end has a diffuser to ensure smooth airflow, a guide section on its inner wall, and a suppressor to prevent backflow. The noise-reducing components include honeycomb elements and sound-absorbing elements. The composite filter module includes a frame and multiple filter layers. The adaptive sealing components include a first seal and a second seal. This application achieves the technical effects of effectively filtering sand and dust, reducing noise, compensating for housing gaps, ensuring smooth airflow, and preventing backflow.

Description

Technical Field

[0001] This application relates to the field of ventilation electrical appliances, and more particularly to a ventilation device with a silent air duct. Background Technology

[0002] In the current field of ventilation electrical appliances, volute exhaust fans are commonly used exhaust equipment. When applied to areas with sand and dust pollution, the core operational pain point of the duct unit is concentrated on a series of performance problems caused by sand and dust accumulation. At the same time, the requirements for noise reduction and sealing reliability are becoming increasingly stringent. In sand and dust environments, large sand particles, micron-sized dust, and sticky dust carried by the airflow will continuously adhere to the inside of the duct and the filter components. This will not only directly block the ventilation channel, increase air resistance, and reduce ventilation flow, but also gradually erode the noise reduction and sealing structures. As a result, the three core performance characteristics of the unit—filtration, noise reduction, and sealing—will decline simultaneously, making it unable to meet the requirements of high-load and long-term stable operation.

[0003] To address the operational challenges in dusty environments, existing ducted air handling units primarily employ three conventional solutions: First, enhanced filtration, which involves simply increasing the number of filter layers and density to intercept dust and attempt to slow down the rate of filtration efficiency degradation; second, passive noise reduction, which involves attaching sound-absorbing cotton with a thickness exceeding 50mm to the inner wall of the duct, relying on sound-absorbing materials to absorb operating noise, with some units supplemented with simple rubber sound-absorbing pads for additional noise reduction; and third, conventional sealing, which involves installing ordinary rubber sealing strips at the joints of the unit's panels, achieving a shell seal through physical compression to block the path of dust leakage.

[0004] All three existing solutions have unavoidable core flaws and cannot meet the long-term operational needs of dusty environments: Multi-layer filters, while improving filtration efficiency in the short term, significantly increase air resistance, leading to increased unit energy consumption and decreased ventilation. Furthermore, filter replacement requires shutdown, bolt removal, and maintenance by a single person takes up to 30 minutes, resulting in extremely low maintenance efficiency. Thick-layer sound insulation cotton solutions are bulky, occupying significant duct installation space, are easily clogged by dust, losing their sound absorption effect, cannot be cleaned, and must be replaced entirely annually, resulting in high maintenance costs and limited noise reduction. Rubber sealing strip solutions are prone to aging, hardening, and cracking in dusty environments with large temperature differences, quickly developing micron-level gaps that allow dust to penetrate and cause secondary pollution, completely rendering the sealing performance ineffective.

[0005] In summary, existing technologies generally suffer from drawbacks such as complex and cumbersome maintenance, bulky and easily failed noise reduction materials, and slow passive response and poor reliability of sealing structures. They cannot simultaneously solve the complex technical problems of filtration attenuation, excessive noise, and sealing failure caused by sand and dust accumulation, thus hindering the widespread application of volute exhaust fans in harsh sand and dust environments. Summary of the Invention

[0006] To address the problem of bulky and easily degraded noise reduction materials for air ducts, this application provides a ventilation device with a silent air duct.

[0007] This application provides a ventilation device with a silent air duct, which adopts the following technical solution: A ventilation device with a silent air duct includes a housing, a volute air duct, and a fan assembly. The housing has an air inlet and an air outlet. The volute air duct is located inside the housing and has an air inlet and an air outlet. The fan assembly is assembled inside the volute air duct to drive airflow. The air inlet of the housing is equipped with a detachable composite filter module for achieving layered interception of sand and dust and quick removal without tools. Noise reduction components are embedded in the inner wall of the airflow bend of the volute air duct to eliminate eddy currents and resonance noise within the air duct. Adaptive sealing components are provided at the joints of the panels of the housing to compensate for gaps in the housing joints and prevent sand and dust leakage.

[0008] By adopting the above technical solutions, the composite filter module can achieve layered interception of sand and dust, effectively treating large particles, fine dust, fine particulate matter, water vapor, and oil fumes. It can also be quickly disassembled without tools, facilitating cleaning and maintenance. The noise reduction component can eliminate eddy currents and resonance noise within the air duct, achieving silent ventilation across the entire frequency range. The adaptive sealing component can compensate for gaps in the shell joints, blocking sand and dust leakage and achieving full-temperature zone sealing and leak prevention. Together, they achieve efficient sand and dust filtration and stable exhaust with a large air volume, solving problems such as easy clogging of filters, poor noise reduction effect, and easy aging and failure of seals in traditional ventilation equipment. It has the advantages of being removable and reusable, convenient and efficient in maintenance, compact in structure and highly adaptable, and stable in long-term operation, significantly extending the service life of the equipment, reducing the difficulty and cost of operation and maintenance, while ensuring that ventilation efficiency is not affected by the filtration and noise reduction structure.

[0009] Preferably, the noise reduction component includes a honeycomb element and a sound-absorbing element. The honeycomb element is assembled on the inner wall of the airflow turning point of the volute duct. The honeycomb element is used to reflect sound waves multiple times and dissipate energy. The honeycomb element has a receiving portion, and the sound-absorbing element is assembled in the receiving portion. The sound-absorbing element has a gradient density for layered absorption of noise at different frequencies.

[0010] By adopting the above technical solutions, the ventilation equipment casing is equipped with a detachable composite filter module at the air inlet end, which can achieve layered interception of sand and dust and quick disassembly without tools. Adaptive sealing components are set at the splicing seams of each panel of the casing to compensate for the gaps in the casing seams and block sand and dust leakage. On this basis, the honeycomb components of the noise reduction components can reflect sound waves at the turning points of the airflow in the duct multiple times and consume energy. The gradient density design of the sound absorption components can absorb noise of different frequencies in layers. The combination of the two can eliminate eddy currents and resonance noise in the duct and significantly reduce the overall operating noise of the ventilation equipment.

[0011] Preferably, the honeycomb component is detachably connected to the volute air duct.

[0012] By adopting the above technical solution, after a long period of use, it is only necessary to remove the clips and take out the honeycomb parts to replace the internal sound-absorbing cotton. There is no need to replace the entire volute air duct or noise reduction components, which further reduces the difficulty and cost of later maintenance.

[0013] Preferably, the composite filter module includes a frame, a first filter section, a second filter section, and a third filter section. The frame has a stacked mounting section along its thickness direction for positioning the first filter section, the second filter section, and the third filter section. The first filter section, the second filter section, and the third filter section are sequentially assembled within the stacked mounting section, with the first filter section positioned closer to the air inlet. The first filter section is used to intercept large particulate impurities in the airflow. The second filter section is used to adsorb tiny dust and fine particulate matter in the airflow. The third filter section is used to block water vapor and oil fumes.

[0014] By adopting the above technical solution, the composite filter module is set with a frame, a first filter section, a second filter section, and a third filter section. The frame is equipped with a stacked installation part to position each filter section. This can achieve the interception and adsorption of large particulate impurities, fine dust and fine particulate matter in the airflow, as well as the blocking of water vapor and oil fumes. This achieves the purpose of stratified interception of sand and dust, ensuring that the core electrical components inside the ventilation equipment are not affected by water vapor and oil fumes, extending their service life, and avoiding airflow noise caused by dust accumulation in the air duct.

[0015] Preferably, the frame and the housing are detachably connected via a quick-release assembly.

[0016] By adopting the above technical solution, the ventilation equipment is equipped with a detachable composite filter module, which can achieve layered interception of sand and dust and quick disassembly without tools. The stacked installation part in the frame can position the first filter section, the second filter section, and the third filter section, and achieve filtration of large particles, fine dust and fine particulate matter, as well as water vapor and oil fumes. The quick-release component allows the frame and the housing to be locked together by clamping and sliding locking parts. The elastic performance of the clamping parts ensures locking, and the guide parts on both sides of the frame cooperate with the guide parts in the housing to achieve sliding connection. This allows the composite filter module to be disassembled without the need for additional tools, and can be completed by holding it with one hand. When reinstalling, the locking is completed during the pushing process, which shortens the disassembly and cleaning time, and the locking structure has a long service life.

[0017] Preferably, the quick-release assembly includes a clamping locking component and a sliding locking component. The clamping locking component is assembled on the housing, and the sliding locking component is assembled on the frame. The sliding locking component engages with the clamping locking component, and the clamping locking component has elastic properties. Guide components are provided on both sides of the frame, and corresponding guide components matching the guide components are provided inside the housing. The frame and the housing are slidably connected through the cooperation of the guide components and the guide structure.

[0018] By adopting the above technical solution, the clamping locking component of the quick-release assembly is assembled on the housing, and the sliding locking component is assembled on the frame. The sliding locking component is engaged with the elastic clamping locking component. The guide components on both sides of the frame cooperate with the guide structure inside the housing to achieve a sliding connection. This enables the composite filter module to be quickly disassembled by hand without tools, shortening the disassembly and cleaning time. Even non-professional users can operate it quickly. Moreover, the locking structure relies on the spring force to maintain the locking state, with little elasticity decay and a service life far exceeding that of traditional snap-on quick-release structures.

[0019] Preferably, the adaptive sealing assembly includes a first seal and a second seal, the first seal wrapping around the second seal, and the first seal being assembled at the joint of each panel of the housing.

[0020] By adopting the above technical solution, the first seal of the adaptive sealing component wraps around the second seal and is assembled at the splicing joint of each panel of the housing, thereby improving the fit and sealing of each panel of the housing, compensating for the gaps in the housing joints, and preventing sand and dust leakage.

[0021] Preferably, the first sealing element has an insert portion, and the housing has a through portion for the insert portion to engage with. The insert portion has at least multiple sets, and the multiple sets of insert portions are arranged alternately. The insert portion and the through portion cooperate to realize the quick assembly and disassembly of the first sealing element.

[0022] By adopting the above technical solution, the embedded part and the through part cooperate to realize the quick disassembly and assembly of the first seal, which makes it easy to cut and replace the first seal separately after partial damage, without the need for overall replacement.

[0023] Preferably, the first seal has a tough portion embedded in the body of the first seal, and the tough portion is elastic to enhance the bending toughness and fracture resistance of the first seal.

[0024] By adopting the above technical solution, the tough part on the first seal is embedded in the body and has elasticity, which can enhance the bending toughness and fracture resistance of the first seal and avoid breakage during disassembly and assembly.

[0025] Preferably, the air inlet of the volute air duct is provided with a diffuser, which is used to achieve a smooth airflow.

[0026] By adopting the above technical solution, it is possible to avoid airflow congestion caused by an excessively small diffusion angle, and also to prevent airflow separation and vortex generation caused by an excessively large angle, thus achieving stable airflow output.

[0027] Preferably, the inner wall of the volute duct has a flow guide section, which is arranged in an arc shape. Multiple sets of flow guide sections are provided, and the multiple sets of flow guide sections are evenly distributed around the inner wall of the volute duct.

[0028] By adopting the above technical solution, the inner wall of the volute air duct is provided with multiple sets of arc-shaped and circumferentially evenly distributed air intakes, which can break up local eddies, guide the airflow to flow orderly towards the air outlet, avoid the superposition of noise due to airflow turbulence, and reduce air volume dissipation.

[0029] Preferably, the air inlet of the volute air duct is provided with a suppression part, and the suppression part is close to the output end of the fan assembly. The suppression part is used to block the backflow of airflow.

[0030] By adopting the above technical solution, a suppression part is set at the air inlet of the volute air duct near the output end of the fan assembly, which can block the backflow of airflow, seal the dead angle of vortex at the connection between the impeller and the volute air duct, eliminate backflow noise, and prevent the air volume reduction caused by the backflow of airflow at the air inlet.

[0031] In summary, this application includes at least one of the following beneficial technical effects: 1. The inner wall of the airflow turning point of the volute duct is embedded with a noise reduction component consisting of honeycomb parts and sound-absorbing parts. The honeycomb parts reflect sound waves multiple times and consume energy, while the sound-absorbing parts have a gradient density to absorb noise of different frequencies in layers. This solves the problem of the duct noise reduction material being bulky and prone to failure, significantly reduces the overall operating noise of the ventilation equipment, extends the service life of the noise reduction component, reduces maintenance costs, and is more suitable for the narrow installation space of the volute duct ventilation equipment. 2. The composite filter module includes a frame, a first filter section, a second filter section, and a third filter section, which can achieve layered interception of sand and dust. The first filter section intercepts large particles of impurities, the second filter section adsorbs fine dust and fine particulate matter, and the third filter section blocks water vapor and oil fumes. This solves the problems of high wind resistance, reduced ventilation volume, and low maintenance efficiency of existing multi-layer filter solutions, ensuring the air volume of ventilation equipment and reducing replacement costs. 3. The composite filter module is connected to the housing via a quick-release assembly, which includes a clamping lock and a sliding lock. Guides are provided on both sides of the frame and inside the housing, enabling tool-free quick disassembly, shortening disassembly and cleaning time, and the locking structure has a long service life. 4. The adaptive sealing assembly includes a first seal and a second seal. The first seal wraps around the second seal, and the combined cross-section has a trapezoidal structure. The first seal has an embedded part that cooperates with the housing through part to achieve quick assembly and disassembly. It can compensate for the gaps in the housing joints and block sand and dust leakage, achieving gapless adaptive sealing across the entire temperature range. 5. The diffuser section of the volute duct inlet can achieve smooth airflow, avoiding airflow congestion and eddy currents caused by airflow separation; the guide section on the inner wall of the volute duct is arc-shaped and has multiple sets evenly distributed around the inner wall, which can disperse local eddy currents and guide the airflow to flow orderly towards the outlet, avoiding the superposition of noise from turbulent airflow and reducing airflow loss; the suppressor section of the volute duct inlet can block backflow of airflow, eliminate backflow noise, and prevent airflow attenuation. Attached Figure Description

[0032] Figure 1 This is an overall structural view of a ventilation device with a silent air duct according to an embodiment of this application; Figure 2 This is a cross-sectional view of a ventilation device with a silent air duct according to an embodiment of this application; Figure 3 This is a cross-sectional view of the noise reduction component according to an embodiment of this application; Figure 4 This is a cross-sectional view of the volute air duct according to an embodiment of this application; Figure 5 This is a schematic diagram of the structure of the composite filtering module according to an embodiment of this application; Figure 6 This is a schematic diagram of the frame structure in the composite filtering module of this application embodiment; Figure 7 This is a schematic diagram of the volute air duct structure according to an embodiment of this application; Figure 8 This is a schematic diagram of the air intake section in the volute air duct of this application embodiment; Figure 9 yes Figure 4 A magnified view of area A in the middle.

[0033] Explanation of reference numerals in the attached figures: 1. Housing; 11. Air inlet; 12. Air outlet; 13. Guide structure; 2. Volute air duct; 21. Diverter; 22. Airflow guide; 23. Suppression section; 3. Fan assembly; 31. Motor; 32. Impeller; 4. Composite filter module; 41. Frame; 410. Elastic rubber sealing strip; 411. Baffle; 412. Guide component; 42. First filter section; 43. Second filter section; 44. Third filter section; 45. Stacked installation section; 5. Noise reduction component; 51. Honeycomb component; 510. Receiving section; 52. Sound-absorbing component; 53. U-shaped buckle; 6. Adaptive sealing component; 61. First sealing component; 610. Tough part; 62. Second sealing component; 7. Quick release component; 71. Clamping component; 710. First clamping block; 711. Second clamping block; 712. Clamping spring; 72. Sliding lock component; 8. Lighting module. Detailed Implementation

[0034] The present application will be further described in detail below with reference to the accompanying drawings.

[0035] This application discloses a ventilation device with a silent air duct, see [link to relevant documentation]. Figure 1 and Figure 2The system includes a housing 1, a volute duct 2, and a fan assembly 3. The housing 1 has an air inlet 11 and an air outlet 12. The volute duct 2 is located inside the housing 1 and has an air inlet and an air outlet. The air inlet communicates with the air inlet 11, and the air outlet communicates with the air outlet 12. The fan assembly 3 is assembled inside the volute duct 2 to drive airflow. A detachable composite filter module 4 is provided on the air inlet 11 of the housing 1 for achieving layered interception of sand and dust and quick removal without tools. Noise reduction components 5 are embedded in the inner wall of the airflow bend of the volute duct 2 to eliminate eddy current and resonance noise within the duct. Adaptive sealing components 6 are provided at the joints of the panels of the housing 1 to compensate for gaps in the housing joints and prevent sand and dust leakage.

[0036] Specifically, see Figure 2 and Figure 3 The noise reduction component 5 includes a honeycomb element 51 and a sound-absorbing element 52. The honeycomb element 51 is installed on the inner wall of the airflow bend in the volute duct 2, and its function is to reflect sound waves multiple times and dissipate energy. Furthermore, the honeycomb element 51 is detachably connected to the volute duct 2. The honeycomb element 51 has a receiving portion 510, and the sound-absorbing element 52 is installed within the receiving portion 510. The sound-absorbing element 52 has a gradient density, allowing for layered absorption of noise at different frequencies.

[0037] In one embodiment, the honeycomb component 51 adopts a hexagonal honeycomb mesh, which is detachably connected to the volute air duct 2 via a U-shaped buckle 53 structure and installed at the airflow turning point of the volute air duct 2.

[0038] In one embodiment, the receiving portion 510 specifically refers to a receiving cavity opened on a hexagonal honeycomb mesh, which is formed by stacking an upper honeycomb shell and a lower honeycomb shell, and is used to receive and protect the sound-absorbing component 52.

[0039] In one embodiment, the sound-absorbing component 52 is made of sound-absorbing cotton, which fills the receiving cavity and has an opening to facilitate noise absorption. Protected by a hexagonal honeycomb mesh, the sound-absorbing cotton is prevented from becoming clogged by sand and dust, thus extending the service life of the noise reduction component 5 and eliminating the need for annual replacement, reducing maintenance costs. Simultaneously, its compact structure is more suitable for the limited installation space of the volute duct type 2 ventilation equipment.

[0040] In one embodiment, the sound-absorbing cotton has a progressively increasing density from the side closest to the inner wall of the duct to the center of the duct, forming a gradient density distribution. The lower-density sound-absorbing cotton near the inner wall of the duct has larger pores, making it easier to absorb low-frequency noise. This type of noise has a longer wavelength and stronger penetrating power, and the lower-density sound-absorbing cotton can better guide sound waves into the interior of the sound-absorbing component 52. The closer to the center of the duct, the higher the density of the sound-absorbing cotton, which can more efficiently convert the vibration energy of mid-to-high frequency noise into heat energy for consumption. The layered gradient density design covers most of the noise frequency range generated when the ventilation equipment is working. Compared with single-density sound-absorbing cotton, the noise reduction effect is greatly improved, and the noise reduction process is more stable, without the situation where specific frequency noise cannot be eliminated.

[0041] In actual operation, when the fan assembly 3 of the ventilation equipment starts, the airflow enters the volute duct 2 along the air intake path. When the airflow passes through the turning point, the vortex noise originally caused by the sudden change in airflow direction will first impact the honeycomb component 51. The hexagonal mesh structure of the honeycomb component 51 will divide and reflect the incident sound waves multiple times, allowing sound waves from different directions to interfere with each other and consume energy inside the mesh. The remaining undissipated sound waves will penetrate the honeycomb mesh and enter the receiving cavity, where they will be absorbed by the gradient density sound-absorbing cotton layer by layer. In the end, only a very small amount of energy will be transmitted outward, which will significantly reduce the overall operating noise of the ventilation equipment. At the same time, the detachable U-shaped buckle 53 connection design means that after a long period of use, only the U-shaped buckle 53 needs to be removed to take out the honeycomb component 51 and replace the internal sound-absorbing cotton. It is not necessary to replace the entire volute duct 2 or the noise reduction assembly 5, which further reduces the difficulty and cost of later maintenance.

[0042] Specifically, see Figure 2 and Figure 3 The composite filter module 4 is connected to the housing 1 via a quick-release assembly 7. The composite filter module 4 includes a frame 41, a first filter section 42, a second filter section 43, and a third filter section 44. The housing 1 has an opening for inserting the frame 41. The frame 41 is inserted into the housing 1 along the opening and is detachably connected to the housing 1 via the quick-release assembly 7.

[0043] The frame 41 has a stacked mounting section 45 along its thickness direction for positioning the first filter section 42, the second filter section 43, and the third filter section 44. The first filter section 42, the second filter section 43, and the third filter section 44 are sequentially assembled within the stacked mounting section 45, with the first filter section 42 positioned closer to the air inlet end 11. The first filter section 42 is used to intercept large particulate impurities in the airflow; the second filter section 43 is used to adsorb fine dust and fine particulate matter in the airflow; and the third filter section 44 is used to block moisture and oil fumes.

[0044] In one embodiment, the stacked mounting part 45 includes a stacked mounting groove, which is formed on the frame 41 and is a semi-open groove, so that the first filter part 42, the second filter part 43 and the third filter part 44 can slide into the side of the frame 41 in sequence to achieve positioning and installation.

[0045] In one embodiment, the first filter section 42 includes a metal filter screen inserted along the depth direction of the stacked mounting groove to intercept large particles. The mesh size of the metal filter screen is set between 0.8mm and 1.2mm, which can effectively block larger impurities such as hair, debris, and lint, while not significantly obstructing the normal airflow, ensuring that the airflow of the ventilation equipment is not affected. In addition, the metal filter screen itself has high structural strength and will not deform due to long-term airflow impact. After being contaminated with impurities, it can be directly removed, rinsed with water, dried, and reinstalled for reuse, thus reducing replacement costs.

[0046] In one embodiment, the second filter section 43 includes an electrostatic adsorption plate. The electrostatic adsorption plate employs tungsten wire honeycomb electrodes with an electrode spacing of 3 mm to adsorb micron-sized fine dust particles. Compared to ordinary flat electrode structures, this honeycomb structure increases the electrode contact area per unit volume, enabling it to capture more tiny impurities in the airflow, resulting in high purification efficiency. It can effectively prevent the accumulation of fine dust particles after entering the air duct, reducing airflow noise caused by dust accumulation in the air duct.

[0047] In one embodiment, the third filter section 44 includes an oleophobic and hydrophobic fiber membrane disposed on a membrane frame. This facilitates the fixation of the oleophobic and hydrophobic fiber membrane and its stable assembly within the stacked mounting groove. The oleophobic and hydrophobic fiber membrane itself is breathable but impermeable to water and does not attract oil, thus preventing external moisture and oil fumes from entering the ventilation equipment. This avoids core electrical components such as circuit boards and fan assembly 3 from becoming damp or covered with oil, extending the service life of the electrical components.

[0048] In one embodiment, an elastic rubber sealing strip 410 is attached to the perimeter of the side wall of the frame 41. On the one hand, it can fill the gap between the frame 41 and the housing 1, preventing airflow from directly bypassing the composite filter module 4 through the gap, ensuring that all air entering the equipment can pass through the complete three-stage filtration process, and improving the overall filtration effect; on the other hand, the elastic rubber sealing strip 410 can also play a role in buffering and vibration reduction, reducing the collision noise caused by vibration between the frame 41 and the housing 1 during equipment operation, and further reducing the overall operating noise of the equipment.

[0049] See Figure 3 and Figure 4In one embodiment, the fan assembly 3 includes a fan and an impeller 32. The fan is fixed on the central axis of the volute duct 2, and the impeller 32 is keyed to the output end of the fan. The fan drives the impeller 32 to rotate, and the impeller 32 drives the airflow to draw indoor air into the volute duct 2 and then discharge it through the volute duct 2.

[0050] In other embodiments, a 12mm thick gradient pore size sound-absorbing sponge can be attached to the outer wall of the volute duct 2. The sound-absorbing sponge has a larger pore size near the air inlet side of the duct, which can absorb low-to-medium frequency airflow vibration noise within the duct; the pore size near the air outlet side is smaller, which can absorb high-frequency wind noise and motor 31 operating noise, further reducing airflow noise within the duct and achieving quiet operation while ensuring adequate ventilation. Moreover, the sound-absorbing sponge itself also has a certain adsorption capacity, which can further capture a small amount of tiny impurities that have passed through the filter layer, helping to improve the air purification effect, and will not adhere to moisture and clog the duct, and will not affect ventilation efficiency with long-term use.

[0051] Specifically, see Figure 5 and Figure 6 The quick-release assembly 7 includes a locking clip 71 and a sliding clip 72. The locking clip 71 is mounted on the housing 1, and the sliding clip 72 is mounted on the frame 41. The sliding clip 72 can engage with the locking clip 71, and the locking clip 71 has elastic properties. Guide clips 412 are provided on both sides of the frame 41, and a corresponding guide structure 13 matching the guide clips 412 is provided inside the housing 1. The frame 41 and the housing 1 are slidably connected through the cooperation of the guide clips 412 and the guide structure 13.

[0052] In one embodiment, the locking member 71 includes a first locking block 710, a second locking block 711, and a locking spring 712. The first locking block 710 and the second locking block 711 are mounted side-by-side on the housing 1 at a distance from each other, and one end of the first locking block 710 and the second locking block 711 are respectively hinged to the housing 1, and the other end abuts against each other through the locking spring 712. Specifically, one end of the locking spring 712 is hinged to the first locking block 710, and the other end is hinged to the second locking block 711.

[0053] In one embodiment, the sliding lock 72 includes a sliding block shaped like a mushroom pin. The sliding block is inserted between a first locking block 710 and a second locking block 711. The first locking block 710 and the second locking block 711 are respectively provided with locking grooves adapted to the shape of the sliding block. The sliding block is locked by the cooperation of the first locking block 710 and the second locking block 711 under the action of the locking spring 712.

[0054] In one embodiment, the guide member 412 includes guide wheels. The guide structure 13 includes guide rails, which are installed inside the housing 1 and have two rails. Two guide wheels are respectively installed on the two sides of the frame 41, and the replacement process is smoother under the guidance of the four guide wheels.

[0055] When the filter assembly needs to be removed for cleaning, simply pull the frame 41 gently from the opening of the housing 1. The sliding block will exert an outward squeezing force on the first clamping block 710 and the second clamping block 711, overcoming the elasticity of the clamping spring 712 and opening the two clamping blocks. The sliding block can then smoothly disengage from the locking groove, and the entire frame 41 can be easily pulled out along the guide rail. No additional tools such as screwdrivers are needed; the disassembly operation can be completed with one hand. When replacing the spare composite filter module 4, simply align the guide wheel with the guide rail and push it in. When the sliding block is inserted into place, it will automatically be locked by the two clamping blocks tightened by the clamping spring 712. The locking is completed during the pushing process, without the need for additional locking operations. The disassembly and cleaning time can be reduced by more than two-thirds, and even non-professional users can operate quickly. At the same time, the locking structure relies on the spring force to maintain the locking state. After long-term use, only a very small amount of elasticity decay will occur, and there will be no problems with buckle breakage or locking failure. The service life is much longer than that of traditional buckle-type quick-release structures.

[0056] In addition, the frame 41 is provided with a baffle 411, which is installed at the open end of the stacked mounting groove and is fixed to the frame 41 with screws. When disassembling and assembling the first filter section 42, the second filter section 43, and the third filter section 44, the filter media can be replaced by removing the screws. The first filter section 42 can also be thoroughly cleaned for recycling. Only the second filter section 43 and the third filter section 44 need to be replaced. A new spare composite filter module 4 can be obtained by replacing the filter media, without replacing the entire frame 41, thus reducing costs. Only filter media or filter plates need to be purchased.

[0057] Specifically, see Figure 7 and Figure 8 The air inlet of the volute duct 2 is provided with a suppression part 23, and the suppression part 23 is close to the output end of the fan assembly 3. The function of the suppression part 23 is to prevent the airflow from flowing back.

[0058] In one embodiment, the suppression part 23 includes an annular rectifier ring, which is installed on the inner wall near the volute duct 2. By embedding an annular rectifier ring in the inner wall of the volute duct 2, the vortex dead angle at the connection between the impeller 32 and the volute duct 2 can be blocked, backflow noise can be eliminated, and airflow reduction caused by backflow of air from the air inlet can be prevented.

[0059] Specifically, see Figure 7 and Figure 8 The air inlet of the volute duct 2 has a diffuser 21, which is used to achieve a smooth airflow.

[0060] In one embodiment, the diffuser 21 includes a diffuser angle, which is specifically the opening angle of the air inlet of the volute duct 2. In this embodiment, the diffuser angle ranges from 6° to 10°, which can prevent airflow congestion caused by an excessively small diffuser angle, and also prevent airflow separation and eddy currents caused by an excessively large angle, thus achieving stable airflow output.

[0061] Specifically, see Figure 7 and Figure 8 The inner wall of the volute air duct 2 has a flow guide 22, which is arranged in an arc shape. Multiple sets of flow guides 22 are provided, and the multiple sets of flow guides 22 are evenly distributed around the inner wall of the volute air duct 2.

[0062] In one embodiment, the airflow guiding section 22 includes arc-shaped guide vanes, which are evenly distributed circumferentially along the inner wall of the volute, with at least three arc-shaped guide vanes. In this embodiment, five arc-shaped guide vanes are provided. The inclination angle of the arc-shaped guide vanes matches the outlet airflow angle of the impeller 32, and the surface is rounded and polished. The vanes can disperse local vortices, guide the airflow to flow orderly towards the outlet, avoid the superposition of noise due to airflow turbulence, and reduce airflow loss.

[0063] Specifically, see Figure 4 and Figure 9 The adaptive sealing assembly 6 includes a first seal 61 and a second seal 62. The first seal 61 wraps around the second seal 62. The first seal 61 is assembled at the splicing seams of each panel of the housing 1.

[0064] The first sealing element 61 has an insert portion, and the housing 1 has a through portion for the insert portion to engage. The insert portion has at least multiple sets, and the multiple sets of insert portions are arranged alternately. The insert portion and the through portion cooperate to realize the quick assembly and disassembly of the first sealing element 61.

[0065] In one embodiment, the first sealing element 61 comprises a low-temperature shape memory alloy, which is a Cu-Al-Mn shape memory alloy with a phase transformation temperature of 20 degrees Celsius. The second sealing element 62 comprises a high-temperature shape memory alloy, which is a Ni-Ti shape memory alloy with a phase transformation temperature of 35 degrees Celsius. The low-temperature shape memory alloy encapsulates the high-temperature shape memory alloy to form a double-layer composite sealing strip. In low-temperature environments above 20°C, the low-temperature shape memory alloy expands first to achieve a basic seal, while in high-temperature environments above 35°C, the high-temperature shape memory alloy expands synchronously to achieve a reinforced seal, achieving gapless adaptive sealing across the entire temperature range. In one embodiment, the insert includes a J-shaped snap-fit ​​protruding from a low-temperature shape memory alloy. The through portion includes a slot that mates with the J-shaped snap-fit. Using an inlaid slot to secure the double-layer sealing strip replaces the traditional adhesive fixing method, facilitating individual removal and replacement after partial damage, eliminating the need for complete replacement.

[0066] Specifically, see Figure 4 and Figure 9 The first seal 61 has a tough part 610, which is embedded in the body of the first seal 61. The tough part 610 is elastic and is used to enhance the bending toughness and fracture resistance of the first seal 61.

[0067] In one embodiment, the tough portion 610 includes an elastic metal liner fitted to the bottom of the double-layer composite sealing strip, which improves the bending toughness and fracture resistance of the double-layer composite sealing strip and prevents breakage during disassembly and assembly. Furthermore, in other embodiments, the cross-section of the double-layer composite sealing strip can be trapezoidal, increasing the contact area with the panel joint and improving the fit and sealing performance.

[0068] Further, see Figure 1 and Figure 2 The air inlet 11 on the outer casing is also connected to a lighting module 8, which is fixedly installed on the outer casing and located in front of the composite filter module 4. In this way, it can provide lighting function while realizing indoor air exchange.

[0069] When ventilation equipment is installed in poorly lit areas such as bedrooms, bathrooms, or entryways, the integrated lighting module 8 does not require additional wiring or installation space, reducing wall openings and wiring, which lowers renovation costs and makes the walls cleaner and more aesthetically pleasing.

[0070] In one embodiment, the lighting module 8 uses low-power LED beads, paired with a soft light diffuser, to provide uniform and non-glaring light. It offers two modes: constant-on and motion-activated. If installed in the entryway or hallway, it can be set to motion-activated mode, automatically turning on when someone enters and turning off after a delay when they leave, eliminating the need for an additional switch and making daily use more convenient. If installed in the bathroom, it can be set to constant-on low-power mode, replacing a nightlight with low continuous power consumption while meeting basic nighttime lighting needs. Furthermore, the outer frame of the lighting module 8 is integrally sealed with the ventilation equipment housing, with waterproof sealant filling the gaps. This prevents moisture and oil from the bathroom and kitchen from seeping into the internal circuitry, extending the module's lifespan and reducing the risk of electrical leakage.

[0071] The working principle of a ventilation device with a silent air duct according to this application is as follows: After the ventilation equipment is started, the fan assembly 3 drives the impeller 32 to rotate and generate negative pressure. The outdoor airflow first passes through the composite filter module 4 at the air inlet 11 of the casing 1, and then passes through the metal filter, electrostatic adsorption plate, and oleophobic and hydrophobic fiber membrane to complete three-stage filtration, intercepting large particulate impurities, micron-sized dust and blocking water and gasoline fumes. The filtered airflow enters the volute duct 2, is smoothly guided by the diffuser 21, and the annular rectifier ring suppresses backflow and eddies. Then, the circumferential arc guide vanes comb the flow direction and eliminate turbulence before being discharged from the air outlet 12. When the airflow passes through the bend of the air duct, the honeycomb component 51 reflects and interferes with the sound waves multiple times to consume the sound energy. The remaining sound waves are absorbed by the gradient density sound-absorbing cotton in layers according to frequency to achieve noise reduction. The double-layer shape memory alloy set at the joint of the panel of the casing 1 is sealed. It expands with the phase change of the ambient temperature and adaptively fills the gap of the joint. Together with the elastic rubber sealing strip 410 of the composite filter module 4, it completely blocks the leakage of sand and dust and abnormal noise of air leakage. The composite filter module 4 can be quickly disassembled by hand without tools through the guide rail and quick-release component 7, which is convenient for cleaning and maintenance.

[0072] This technical solution achieves multiple functions through the synergistic collaboration of four core structures: three-stage composite filtration, gradient density honeycomb noise reduction, double-layer adaptive temperature sensing seal, and volute airflow guide. These functions include efficient dust filtration, silent ventilation across the entire frequency range, leak-proof sealing across all temperature zones, and stable exhaust with a large air volume. It not only solves the technical problems of traditional ventilation equipment, such as easy clogging of filters, poor noise reduction effect and frequent replacement of consumables, easy aging and failure of seals, large duct vortices leading to air volume attenuation and excessive noise, and cumbersome disassembly and assembly of filters with high maintenance costs, but also has the advantages of being removable and reusable, convenient and efficient in maintenance, compact structure with strong adaptability, and stable long-term operating performance. This significantly extends the service life of the equipment, reduces the difficulty and cost of operation and maintenance, and ensures that ventilation efficiency is not affected by the filtration and noise reduction structures.

[0073] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A ventilation device with a silent air duct, comprising a housing (1), a volute air duct (2), and a fan assembly (3), wherein the housing (1) is provided with an air inlet (11) and an air outlet (12); the volute air duct (2) is disposed inside the housing (1) and has an air inlet; the fan assembly (3) is assembled inside the volute air duct (2) to drive airflow, characterized in that: The housing (1) is provided with a detachable composite filter module (4) on the air inlet end (11) for achieving layered interception of sand and dust and quick removal without tools; the airflow turning inner wall of the volute duct (2) is provided with a noise reduction component (5) to eliminate eddy current and resonance noise in the duct; the splicing seams of each panel of the housing (1) are provided with an adaptive sealing component (6) to compensate for the gaps in the housing seams and block sand and dust leakage.

2. The ventilation equipment with a silent air duct according to claim 1, characterized in that: The noise reduction component (5) includes a honeycomb element (51) and a sound-absorbing element (52). The honeycomb element (51) is mounted on the inner wall of the airflow turning point of the volute duct (2). The honeycomb element (51) is used to reflect sound waves multiple times and dissipate energy. The honeycomb element (51) has a receiving part (510). The sound-absorbing element (52) is mounted in the receiving part (510). The sound-absorbing element (52) has a gradient density and is used to absorb noise of different frequencies in layers.

3. The ventilation equipment with a silent air duct according to claim 2, characterized in that: The honeycomb component (51) is detachably connected to the volute air duct (2).

4. The ventilation equipment with a silent air duct according to claim 1, characterized in that: The composite filter module (4) includes a frame (41), a first filter section (42), a second filter section (43), and a third filter section (44). The frame (41) has a stacked mounting section (45) along the thickness direction for positioning the first filter section (42), the second filter section (43), and the third filter section (44). The first filter section (42), the second filter section (43), and the third filter section (44) are sequentially assembled in the stacked mounting section (45), and the first filter section (42) is arranged close to the air inlet end (11). The first filter section (42) is used to intercept large particulate impurities in the airflow. The second filter section (43) is used to adsorb tiny dust and fine particulate matter in the airflow. The third filter section (44) is used to block water vapor and oil fumes.

5. The ventilation equipment with a silent air duct according to claim 4, characterized in that: The frame (41) and the housing (1) are detached and connected by a quick-release assembly (7).

6. The ventilation equipment with a silent air duct according to claim 5, characterized in that: The quick-release assembly (7) includes a clamping locking member (71) and a sliding locking member (72). The clamping locking member (71) is mounted on the housing (1), and the sliding locking member (72) is mounted on the frame (41). The sliding locking member (72) engages with the clamping locking member (71), and the clamping locking member (71) has elastic properties. The frame (41) has guide members (412) on both sides, and the housing (1) has a corresponding guide structure (13) that matches the guide members (412). The frame (41) and the housing (1) are slidably connected through the cooperation of the guide members (412) and the guide structure (13).

7. The ventilation equipment with a silent air duct according to claim 1, characterized in that: The adaptive sealing assembly (6) includes a first seal (61) and a second seal (62), wherein the first seal (61) wraps around the second seal (62), and the first seal (61) is assembled at the splicing joint of each panel of the housing (1).

8. The ventilation equipment with a silent air duct according to claim 7, characterized in that: The first sealing member (61) has an embedded part, and the housing (1) is provided with a through part for the embedded part to engage. The embedded part is provided in at least multiple sets, and the multiple sets of embedded parts are arranged alternately. The embedded part and the through part cooperate to realize the quick assembly and disassembly of the first sealing member (61).

9. The ventilation equipment with a silent air duct according to claim 7, characterized in that: The first seal (61) has a tough part (610) embedded in the body of the first seal (61) and the tough part (610) is elastic to enhance the bending toughness and fracture resistance of the first seal (61).

10. The ventilation equipment with a silent air duct according to claim 1, characterized in that: The inlet of the volute air duct (2) is provided with a diffuser (21), which is used to achieve a smooth flow of air.

11. The ventilation equipment with a silent air duct according to claim 1, characterized in that: The inner wall of the volute air duct (2) has a flow guide (22), which is arranged in an arc shape. Multiple sets of the flow guide (22) are provided, and the multiple sets of flow guide (22) are evenly arranged around the inner wall of the volute air duct (2).

12. The ventilation equipment with a silent air duct according to claim 1, characterized in that: The inlet of the volute air duct (2) is provided with a suppression part (23), and the suppression part (23) is close to the output end of the fan assembly (3). The suppression part (23) is used to block the backflow of airflow.

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