Silent variable frequency exhaust box

Abstract

The utility model discloses a mute type frequency conversion exhaust box, it includes box, and the box includes first cavity, second cavity and third cavity, and the inside fixed connection of first cavity has the mounting panel, and the corner of second cavity is provided with arc flow guide rib plate, and second cavity and arc flow guide rib plate form S type air duct, and S type air duct is provided with flow guide plate and sound absorption cotton, and the fixed connection of mounting panel has buffer pad, and the outside rotating joint of buffer pad has connecting rod, and the bottom rotating joint of connecting rod has sliding block, and the outside fixed connection of sliding block has compound spring. Through above -mentioned structure, through arc flow guide rib plate cooperation flow guide plate in the air duct, can guide airflow laminar flow steadily, reduce vortex and wall friction noise, simultaneously, the sound absorption cotton in the air duct absorbs high frequency noise in airflow, in addition, the mounting panel reduces the shock through double structure, can reduce horizontal and longitudinal vibration, greatly weaken the transmission of fan vibration to the box, reduce vibration noise from the source.

Description

Technical Field

[0001] This utility model relates to the field of variable frequency exhaust box technology, and in particular to a silent variable frequency exhaust box. Background Technology

[0002] In various settings such as industrial production, commercial buildings, and residential homes, exhaust ventilation equipment is increasingly widely used as a key device to ensure air circulation and improve indoor air quality. However, as people's demands for comfort in their living and working environments continue to rise, the noise generated during the operation of exhaust ventilation equipment is gradually becoming a significant factor restricting its further widespread application.

[0003] Most exhaust boxes on the market today use straight channels or simple angled channels in their duct design. This structure easily leads to turbulence within the channel during airflow, and also generates significant friction between the airflow and the duct wall, resulting in noticeable airflow noise. This noise problem is particularly pronounced when the exhaust box operates at high power and high airflow speed, severely impacting the quietness of the surrounding environment.

[0004] Furthermore, the centrifugal fans inside existing exhaust boxes generate significant vibrations during operation, and the connection structure between the fan and the box typically lacks effective vibration damping design. The vibrations generated by the fan are directly transmitted to the box, and then radiate outwards through the box, further exacerbating noise pollution. Most systems rely solely on the box's own material for simple sound insulation, failing to effectively absorb the high-frequency noise generated during airflow. This results in the high-frequency noise and mid-to-low-frequency vibration noise superimposing each other during operation, creating a more complex and harsh noise environment that negatively impacts people's physical and mental health, as well as work and study efficiency. Therefore, a quiet exhaust system is needed that can effectively reduce airflow and vibration noise while maintaining good exhaust performance. Utility Model Content

[0005] The purpose of this invention is to provide a silent variable frequency exhaust box to solve the problems mentioned in the background art.

[0006] This utility model also provides a silent variable frequency exhaust box as described above, comprising: a box body, the box body including a first cavity, a second cavity and a third cavity, a mounting plate fixedly connected inside the first cavity, a centrifugal fan fixedly connected to the upper surface of the mounting plate, the outlet of the centrifugal fan being fixedly connected to the second cavity, an arc-shaped guide rib being provided at the corner of the second cavity; the second cavity and the arc-shaped guide rib forming an S-shaped air duct, a guide plate and sound-absorbing cotton being provided inside the S-shaped air duct, and an elastic isolation pad being provided inside the third cavity; a buffer pad being fixedly connected to the mounting plate, a connecting rod being rotatably connected to the outside of the buffer pad, a slider being rotatably connected to the bottom of the connecting rod, a composite spring being fixedly connected to the outside of the slider, and the side end of the composite spring being fixedly connected to the box body; a column and a shock-absorbing spring being fixedly connected to the lower surface of the buffer pad, and the bottom of the column and the shock-absorbing spring being fixedly connected to the bottom wall of the box body.

[0007] Preferably, the inlet of the centrifugal fan is fixedly connected to an air inlet pipe, and the inside of the air inlet pipe is fixedly connected to a grid and a honeycomb airflow equalization plate.

[0008] Preferably, the bottom wall of the housing is provided with a sliding groove, and the interior of the sliding groove is slidably connected to the slider.

[0009] Preferably, the inner wall of the enclosure is fixedly connected with a damping sound insulation felt, which has a double-layer structure.

[0010] Preferably, an isolation layer is provided between the second cavity and the third cavity, and centrifugal glass wool is provided inside the isolation layer.

[0011] Preferably, the interior of the S-shaped air duct is provided with a modified activated carbon mesh, which is located on the side of the guide plate, and the guide plate is provided in multiple sets and arranged along the inclined direction.

[0012] Preferably, an exhaust channel is provided between the S-shaped air duct and the third cavity, and the exhaust channel adopts a gradually expanding diameter structure.

[0013] Preferably, an arc-shaped transition plate is provided at the bottom of the S-shaped air duct, and the arc-shaped transition plate is located on the side of the exhaust duct.

[0014] Compared with existing technologies, the beneficial effects of this utility model are as follows: By guiding the airflow smoothly through the S-shaped air duct, arc-shaped guide ribs, and guide plates, it avoids the problem of sudden local pressure increases caused by airflow turbulence in traditional straight channels or simple angled channels, and reduces the impact loss of airflow on the duct wall. This not only ensures the stability of exhaust efficiency but also reduces the wear of the duct caused by long-term airflow impact. At the same time, the sound-absorbing cotton specifically absorbs high-frequency noise, ultimately significantly reducing the overall operating noise of the equipment. It avoids the interference of traditional exhaust box noise on human rest, work concentration, and experimental accuracy, and significantly improves the environmental comfort and user experience in various scenarios.

[0015] The dual shock absorption structure of the mounting plate, both horizontally and vertically, can effectively buffer the vibration generated during the operation of the centrifugal fan. The horizontal vibration of the centrifugal fan is absorbed by the sliding of the slider and the deformation of the composite spring, and the vertical vibration is buffered by the buffer pad and the shock-absorbing spring. This greatly reduces the transmission of fan vibration to the housing, avoids the occurrence of resonance between fan vibration and housing, reduces fatigue damage to fan components and housing connection structures caused by long-term vibration, and slows down the aging of the equipment. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0017] Figure 1 This is a complete structural diagram of the silent variable frequency exhaust box of this utility model;

[0018] Figure 2 This is a cross-sectional structural diagram of the silent variable frequency exhaust box of this utility model;

[0019] Figure 3 This is a structural diagram of the filter mechanism of the silent variable frequency exhaust box of this utility model;

[0020] Figure 4 This is a diagram showing the internal structure of the silent variable frequency exhaust box of this utility model;

[0021] Figure 5 This is a structural diagram of the shock absorption mechanism of the silent variable frequency exhaust box of this utility model;

[0022] Figure 6 This is a structural diagram of the exhaust channel of the silent variable frequency exhaust box of this utility model.

[0023] Legend:

[0024] 1. Housing; 2. First cavity; 3. Second cavity; 4. Third cavity; 5. Mounting plate; 6. Centrifugal fan; 7. Arc-shaped guide rib; 8. S-shaped air duct; 9. Guide plate; 10. Sound-absorbing cotton; 11. Elastic isolation pad; 12. Buffer pad; 13. Connecting rod; 14. Slider; 15. Composite spring; 16. Column; 17. Shock-absorbing spring; 18. Air inlet pipe; 19. Grille; 20. Honeycomb airflow equalization plate; 21. Slide groove; 22. Damping sound insulation felt; 23. Isolation interlayer; 24. Centrifugal glass wool; 25. Modified activated carbon mesh; 26. Exhaust duct; 27. Arc-shaped transition plate. Detailed Implementation

[0025] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0026] The present invention will be further described in detail below with reference to embodiments:

[0027] Example 1

[0028] like Figure 1-6 As shown in the figure, a silent variable frequency exhaust box according to an embodiment of the present invention includes: a box body 1, the box body 1 including a first cavity 2, a second cavity 3 and a third cavity 4, a mounting plate 5 fixedly connected inside the first cavity 2, a centrifugal fan 6 fixedly connected to the upper surface of the mounting plate 5, the outlet of the centrifugal fan 6 being fixedly connected to the second cavity 3, and an arc-shaped guide rib 7 provided at the corner of the second cavity 3; the second cavity 3 and the arc-shaped guide rib 7 form an S-shaped air duct 8, and a guide plate 9 and sound-absorbing cotton are provided inside the S-shaped air duct 8. 10. An elastic isolation pad 11 is provided inside the third cavity 4; a buffer pad 12 is fixedly connected to the mounting plate 5; a connecting rod 13 is rotatably connected to the outside of the buffer pad 12; a slider 14 is rotatably connected to the bottom of the connecting rod 13; a composite spring 15 is fixedly connected to the outside of the slider 14; the side end of the composite spring 15 is fixedly connected to the box 1; a column 16 and a shock-absorbing spring 17 are fixedly connected to the lower surface of the buffer pad 12; the bottom of the column 16 and the shock-absorbing spring 17 are both fixedly connected to the bottom wall of the box 1.

[0029] The centrifugal fan 6 is fixedly connected to the inlet pipe 18, and the inside of the inlet pipe 18 is fixedly connected to the grid mesh 19 and the honeycomb airflow equalization plate 20; the bottom wall of the box 1 is provided with a sliding groove 21, and the inside of the sliding groove 21 is slidably connected to the slider 14; the inner wall of the box 1 is fixedly connected with the damping sound insulation felt 22, which has a double-layer structure; an isolation interlayer 23 is provided between the second cavity 3 and the third cavity 4, and centrifugal glass wool 24 is provided inside the isolation interlayer 23; a modified activated carbon mesh 25 is provided inside the S-shaped air duct 8, and the modified activated carbon mesh 25 is located on the side of the guide plate 9, which has multiple sets and is arranged along the inclined direction; an exhaust channel 26 is provided between the S-shaped air duct 8 and the third cavity 4, and the exhaust channel 26 adopts a gradually expanding diameter structure; an arc-shaped transition plate 27 is provided at the bottom of the S-shaped air duct 8, and the arc-shaped transition plate 27 is located on the side of the exhaust channel 26.

[0030] In this embodiment, when the silent variable frequency exhaust box is working, the centrifugal fan 6 generates negative pressure through frequency conversion, allowing the air to first pass through the grille 19 of the air inlet duct 18 to filter impurities, and then pass through the honeycomb airflow equalization plate 20 to organize the airflow. Next, the airflow enters the S-shaped air duct 8 of the second cavity 3, flows smoothly under the guidance of the arc-shaped guide ribs 7 and guide plates 9, and is purified by the modified activated carbon mesh 25 inside the second cavity 3 and reduced in noise by the sound-absorbing cotton 10. Subsequently, the airflow is smoothly discharged through the gradually expanding exhaust channel 26, thereby reducing outlet noise. Simultaneously, the double shock-absorbing structure of the mounting plate 5, the damping sound insulation felt 22 inside the box 1, and the centrifugal glass wool 24 of the isolation interlayer 23 can suppress vibration and noise in all directions, achieving efficient and silent exhaust.

[0031] Example 2

[0032] like Figure 1-6 As shown in the figure, a silent variable frequency exhaust box according to an embodiment of the present invention includes a box body 1, which includes a first cavity 2, a second cavity 3 and a third cavity 4. An installation plate 5 is fixedly connected inside the first cavity 2, and a centrifugal fan 6 is fixedly connected to the upper surface of the installation plate 5. When the equipment is started, the centrifugal fan 6 generates a stable negative pressure suction force by adjusting the speed through frequency conversion. Under the action of negative pressure, the external air to be discharged first enters the air inlet pipe 18 fixedly connected to the inlet of the centrifugal fan 6. The grid 19, as the first barrier, can effectively intercept large particulate impurities in the air, prevent impurities from entering the subsequent cavities and the interior of the centrifugal fan 6, avoid fan wear or air duct blockage, and extend the service life of the equipment. After being filtered by the grille 19, the airflow will flow through the honeycomb airflow equalization plate 20. The honeycomb structure can organize the turbulent airflow into a uniform and stable airflow bundle, eliminating the vortex phenomenon before the airflow enters the centrifugal fan 6. On the one hand, it reduces the noise generated by the airflow impact, and on the other hand, it ensures that the airflow drawn into the centrifugal fan 6 is stable, improves the exhaust efficiency of the fan, and avoids fan load fluctuations caused by uneven airflow.

[0033] The second cavity 3, together with the arc-shaped guide rib 7 located at its corner, forms an S-shaped air duct 8. This structure is the core area for the equipment to achieve airflow optimization and noise reduction. The arc-shaped structure of the guide rib 7 can avoid the impact and turbulence caused by the sudden turn of the airflow at the corner of the cavity, reducing local resistance loss. At the same time, multiple sets of guide plates 9 arranged along the inclined direction inside the S-shaped air duct 8 further guide the airflow into a smooth flow path along the curve of the air duct, so that the airflow remains in a laminar state throughout the entire S-shaped air duct 8, which greatly reduces the friction noise between the airflow and the air duct wall, while improving the airflow efficiency and avoiding local airflow stagnation.

[0034] Meanwhile, the modified activated carbon mesh 25 located on the side of the guide plate 9 utilizes the porous adsorption structure of activated carbon to deeply adsorb and purify harmful gases and fine particulate matter in the airflow, achieving a higher level of cleanliness in the exhaust air, making it particularly suitable for locations with high air quality requirements. The sound-absorbing cotton 10 laid inside the S-shaped duct 8, with its porous material structure, effectively absorbs mid-to-high frequency noise generated during airflow, as well as noise generated by friction between the airflow and duct components. The sound-absorbing cotton 10 converts sound energy into heat energy, reducing noise reflection and propagation within the duct, laying the foundation for further noise reduction. The internal arc-shaped transition plate 27 smoothly guides the airflow treated by the S-shaped duct 8 to the exhaust channel 26, preventing secondary eddies and noise caused by abrupt path changes before entering the exhaust channel 26, ensuring the continuity and stability of the airflow.

[0035] When airflow enters exhaust duct 26 from S-shaped duct 8, the airflow velocity gradually decreases as the cross-sectional area of ​​the duct increases. This gradual decrease in velocity avoids exhaust outlet noise caused by excessive velocity and reduces the impact of airflow on the outlet of exhaust duct 26, further reducing operating noise. The gradually expanding diameter structure also reduces airflow resistance loss during exhaust, ensuring stable exhaust pressure and preventing a decrease in exhaust efficiency due to excessive resistance. This ensures stable exhaust under different operating conditions. Furthermore, multiple sets of guide vanes 9 are installed inside exhaust duct 26 to guide the airflow.

[0036] Example 3

[0037] like Figure 1-6As shown in the figure, a silent variable frequency exhaust box according to an embodiment of the present invention includes a box body 1, which includes a first cavity 2, a second cavity 3 and a third cavity 4. An installation plate 5 is fixedly connected inside the first cavity 2. The bottom of the installation plate 5 is provided with a shock absorption mechanism. During the operation of the equipment, when the centrifugal fan 6 vibrates, the vibration is first transmitted to the buffer pad 12. The buffer pad 12 initially absorbs part of the vibration energy. The remaining vibration is driven by the connecting rod 13 to drive the slider 14 to slide in the slide groove 21. The composite spring 15 undergoes elastic deformation, converting the vibration energy into the elastic potential energy of the spring, further attenuating the vibration and preventing the vibration from being directly transmitted to the box body 1.

[0038] A column 16 and a shock-absorbing spring 17 are also fixed to the lower surface of the buffer pad 12, and the bottom of both are fixed to the bottom wall of the housing 1. The column 16 serves to support the mounting plate 5 and ensure the stability of the mounting plate 5. The shock-absorbing spring 17 works in conjunction with the composite spring 15 to form a double elastic shock-absorbing structure, which further enhances the absorption effect of the vibration of the centrifugal fan 6 and significantly reduces the vibration transmission efficiency.

[0039] Example 4

[0040] like Figure 1-6 As shown in the figure, this utility model provides a silent variable frequency exhaust box. The inner wall of the box 1 is fixedly connected with a damping sound insulation felt 22. Through the damping material properties, the vibration of the box 1 wall surface can be effectively suppressed, reducing the secondary noise generated by the vibration of the box 1. At the same time, combined with the damping material properties and the advantages of double-layer superposition, it can prevent the airflow noise and fan operation noise inside the box 1 from being transmitted to the outside.

[0041] It should be noted that the damping sound insulation felt 22, as the core sound insulation component fixed to the inner wall of the enclosure 1, will receive the vibration energy when the vibration energy is transmitted to the wall of the enclosure 1. With the help of the high damping coefficient, the molecules inside the damping sound insulation felt 22 will quickly rub against each other, convert the vibration energy into a small amount of heat energy and dissipate it, which will greatly reduce the transmission efficiency of vibration energy and ultimately reduce the vibration amplitude of the wall of the enclosure 1 to a minimum, thereby reducing the generation of secondary noise from the source and avoiding the overall noise level from being aggravated by the vibration of the enclosure 1.

[0042] Specifically, when the internal noise sound waves propagate to the first layer of the damping sound insulation felt 22, some of the sound waves will be reflected by the material surface, while the other part of the sound waves will enter the interior of the material. The sound waves that enter the interior will be further absorbed due to the porous structure and molecular friction inside the material, and the sound wave energy will be greatly attenuated. The remaining sound waves after being attenuated by the first layer will enter the second layer of the damping sound insulation felt 22. The second layer of material will repeat the reflection and absorption process, and perform secondary attenuation of the sound waves.

[0043] Example 5

[0044] like Figure 1-6 As shown in the figure, this utility model embodiment provides a silent variable frequency exhaust box. An isolation layer 23 is provided between the second cavity 3 and the third cavity 4, filled with centrifugal glass wool 24. The centrifugal glass wool 24 has excellent sound absorption performance, absorbing noise transmitted between the cavities. Simultaneously, the isolation layer 23 reduces vibration transmission between the second cavity 3 and the third cavity 4, further improving the overall noise reduction effect of the equipment. The elastic isolation pad 11 inside the third cavity 4 not only fixes and buffers the components within the third cavity 4 but also reduces vibration transmission between the third cavity 4 and other parts of the box 1, preventing mutual interference between the vibrations of each cavity and forming an overall silent vibration reduction system. The multi-dimensional noise reduction and vibration reduction structure, combining double-layer damping sound insulation felt 22 and sound absorption filling with centrifugal glass wool 24, achieves efficient exhaust while significantly reducing operating noise and vibration, meeting the needs of various application scenarios requiring quiet and efficient exhaust.

[0045] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0046] The above description is only used to illustrate the technical solution of this utility model and is not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. A silent variable frequency exhaust box, comprising: The box body (1) is characterized in that the box body (1) includes a first cavity (2), a second cavity (3) and a third cavity (4), an installation plate (5) is fixedly connected inside the first cavity (2), a centrifugal fan (6) is fixedly connected to the upper surface of the installation plate (5), the outlet of the centrifugal fan (6) is fixedly connected to the second cavity (3), and an arc-shaped guide rib (7) is provided at the corner of the second cavity (3); The second cavity (3) and the arc-shaped guide rib (7) form an S-shaped air duct (8). The S-shaped air duct (8) is provided with a guide plate (9) and sound-absorbing cotton (10). The third cavity (4) is provided with an elastic isolation pad (11). The mounting plate (5) is fixedly connected to a buffer pad (12), the buffer pad (12) is rotatably connected to a connecting rod (13), the bottom of the connecting rod (13) is rotatably connected to a slider (14), the slider (14) is fixedly connected to a composite spring (15), and the side end of the composite spring (15) is fixedly connected to the housing (1). The lower surface of the buffer pad (12) is fixedly connected to a column (16) and a shock-absorbing spring (17), and the bottom of the column (16) and the shock-absorbing spring (17) are fixedly connected to the bottom wall of the box (1).

2. The silent variable frequency exhaust box according to claim 1, characterized in that, The centrifugal fan (6) is fixedly connected to an air inlet pipe (18), and the inside of the air inlet pipe (18) is fixedly connected to a grid (19) and a honeycomb airflow equalization plate (20).

3. The silent variable frequency exhaust box according to claim 1, characterized in that, The bottom wall of the box (1) is provided with a sliding groove (21), and the interior of the sliding groove (21) is slidably connected to the slider (14).

4. The silent variable frequency exhaust box according to claim 1, characterized in that, The inner wall of the enclosure (1) is fixedly connected with a damping sound insulation felt (22), which has a double-layer structure.

5. A silent variable frequency exhaust box according to claim 1, characterized in that, An isolation layer (23) is provided between the second cavity (3) and the third cavity (4), and centrifugal glass wool (24) is provided inside the isolation layer (23).

6. A silent variable frequency exhaust box according to claim 1, characterized in that, The S-shaped air duct (8) is provided with a modified activated carbon mesh (25) inside. The modified activated carbon mesh (25) is located on the side of the guide plate (9). There are multiple sets of the guide plate (9) and they are arranged in an inclined direction.

7. A silent variable frequency exhaust box according to claim 6, characterized in that, An exhaust channel (26) is provided between the S-shaped air duct (8) and the third cavity (4), and the exhaust channel (26) adopts a gradually expanding diameter structure.

8. A silent variable frequency exhaust box according to claim 7, characterized in that, The bottom of the S-shaped air duct (8) is provided with an arc-shaped transition plate (27), which is located on the side of the exhaust duct (26).

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