Mute fresh air system

Abstract

The utility model discloses a mute fresh air system which comprises a fan, a sound insulation fan cover and a ventilation plate, the ventilation plate is of a hollow structure, the fan is installed inside the ventilation plate, the sound insulation fan cover is arranged on the outer side of the fan in a covering mode, the sound insulation fan cover is installed on the ventilation plate in an embedded mode, the fan is a centrifugal fan, and an air channel cavity is formed inside the ventilation plate. The sound insulation fan cover is provided with two arc-shaped sound insulation plates, the two arc-shaped sound insulation plates are oppositely arranged, and a notch communicated with the air channel cavity is formed between the two arc-shaped sound insulation plates. Ventilation can be achieved, noise generated during ventilation of the fan can be reduced, and the mute and noise reduction effects are achieved.

Description

Technical Field

[0001] This utility model belongs to the field of noise reduction technology, specifically relating to a silent fresh air system. Background Technology

[0002] A soundproof cabin is a sealed space designed to isolate external noise and electromagnetic waves. It primarily achieves its sound insulation effect through acoustic principles and the use of sound-absorbing materials. Soundproof cabins are widely used in production, living, office, learning, and scientific research environments, providing users with a quiet acoustic space. However, as a sealed environment, a soundproof cabin needs to address ventilation while maintaining quietness, providing fresh air to prevent oxygen deficiency and potential health risks. Current fresh air systems mainly provide fresh air to the soundproof cabin through exhaust fans at the air inlet. However, during operation, the fan, blades, and airflow generate noise, which propagates and increases the overall noise level, negatively impacting the acoustic environment of the soundproof cabin. Therefore, to avoid the shortcomings of existing technologies, improvements are necessary. Utility Model Content

[0003] The purpose of this invention is to provide a silent fresh air system that can achieve ventilation and reduce the noise of the fan during ventilation, thus achieving a silent noise reduction effect.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0005] A silent fresh air system includes a fan, a soundproof hood, and a ventilation panel. The ventilation panel has a hollow structure. The fan is installed inside the ventilation panel, and the soundproof hood covers the outside of the fan. The fan is a centrifugal fan. An air duct cavity is formed inside the ventilation panel. The soundproof hood has two arc-shaped soundproof panels that can be embedded in the ventilation panel. The two arc-shaped soundproof panels are arranged opposite each other, and a notch is formed between the two arc-shaped soundproof panels. The air outlet side of the fan communicates with the air duct cavity through the notch.

[0006] As a preferred embodiment of the aforementioned silent fresh air system, the upper end of the soundproof hood is provided with a frustum-shaped end cap, the surface of which is arc-shaped, and the middle of which is provided with an air inlet communicating with the air inlet side of the fan.

[0007] As a preferred embodiment of the aforementioned silent fresh air system, the inner side of the end cap is covered with a first sound-insulating sponge.

[0008] As a preferred embodiment of the aforementioned silent fresh air system, the inner wall of the sound insulation panel is lined with a second sound-insulating sponge.

[0009] As a preferred embodiment of the aforementioned silent fresh air system, the outer side of the sound insulation panel is provided with an outwardly protruding buckle, and the ventilation panel is provided with a snap-fit ​​structure on the outer side of the sound insulation panel, wherein the buckle snaps into the snap-fit ​​structure.

[0010] As a preferred embodiment of the aforementioned silent fresh air system, the bottom of the end cap is provided with a positioning protrusion, and the ventilation plate is provided with a positioning groove, with the positioning protrusion inserted into the positioning groove.

[0011] As a preferred embodiment of the aforementioned silent fresh air system, the lower surface of the end cap is coated with an EVA coating, and the outer side wall of the sound insulation panel is coated with an EVA coating.

[0012] As a preferred embodiment of the aforementioned silent fresh air system, the ventilation panel is provided with several air outlets, and the air duct cavity is connected to the external environment through the air outlets.

[0013] The advantages of implementing the silent fresh air system provided by this utility model compared with the prior art are as follows:

[0014] This invention utilizes a centrifugal fan for air intake and ventilation. Air enters the impeller along the axial direction of the centrifugal fan, changes direction radially as it passes through the impeller, and exits radially from the side of the impeller. It then passes through the opening in the soundproof hood into the air duct cavity inside the ventilation plate, and is finally discharged through the ventilation plate, completing the ventilation process. The ventilation plate has a hollow structure; air enters through one side of the fan opening and exits through the ventilation plate, preventing the soundproof chamber from directly connecting to the external environment and affecting the noise reduction effect. The soundproof hood is equipped with two arc-shaped soundproof panels, forming a cylindrical cavity around the outside of the fan. Noise generated by the centrifugal fan's intake is amplified when sound waves propagate axially into the cavity of the soundproof hood. The inner wall of the arc-shaped sound insulation panel reflects sound waves of certain frequencies, forming standing waves within the cavity. The antinodes and nodes of these standing waves are fixed in position. When the sound-absorbing material is placed at the antinodes, it can absorb sound energy more effectively. The arc-shaped sound insulation panel can reduce sound scattering and diffraction caused by irregular shape, which is beneficial for controlling the direction of sound propagation. Furthermore, when sound-absorbing material is placed around it, the layout can be optimized according to the law of sound wave reflection to enhance the sound absorption effect. The arc-shaped sound insulation panels form gaps that connect with the air duct cavity, allowing the air entering the fan impeller to enter the air duct cavity along the direction of the gaps for ventilation. The structure of the sound insulation hood ensures that the centrifugal fan can reduce noise during ventilation, achieving a sound insulation and noise reduction effect. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings of the embodiments will be briefly described below.

[0016] Figure 1This is a schematic diagram of the silent fresh air system of this utility model;

[0017] Figure 2 This is an exploded view of the silent fresh air system of this utility model;

[0018] Figure 3 This is a schematic diagram of the internal structure of the silent fresh air system of this utility model;

[0019] Figure 4 This is a schematic diagram of the ventilation panel of this utility model from another angle.

[0020] Marked in the image:

[0021] 100. Ventilation panel; 110. Snap-fit ​​structure; 120. Positioning groove; 130. Air duct cavity; 140. Air outlet; 200. Fan; 210. Impeller; 300. Soundproof hood; 310. Arc-shaped soundproof panel; 320. Notch; 330. Air inlet; 340. End cap; 350. Buckle. Detailed Implementation

[0022] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0023] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0025] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0026] Please refer to the following: Figures 1 to 4 The silent fresh air system provided in the embodiments of this utility model will now be described.

[0027] like Figures 1 to 4 As shown, the silent fresh air system of this utility model includes a fan 200, a soundproof hood 300, and a ventilation panel 100. The ventilation panel 100 has a hollow structure. The fan 200 is installed inside the ventilation panel 100, and the soundproof hood 300 covers the outside of the fan 200. The fan 200 is a centrifugal fan. An air duct cavity 130 is formed inside the ventilation panel 100. The soundproof hood 300 is provided with two arc-shaped soundproof panels 310 that can be embedded in the ventilation panel 100. The two arc-shaped soundproof panels 310 are arranged opposite each other, and a notch 320 is formed between the two arc-shaped soundproof panels 310. The air outlet side of the fan 200 is connected to the air duct cavity 130 through the notch 320.

[0028] Specifically, the distance between the base plate of the centrifugal fan 200 and the ventilation plate 100 is about 3mm. By making the centrifugal fan 200 fit better with the ventilation plate 100, the gap between the base plate of the centrifugal fan 200 and the ventilation plate 100 is reduced, making the air output more stable, reducing wind noise, and the dynamic balance of the centrifugal fan 200 is better and more stable.

[0029] The silent fresh air system is installed on the silent cabin. The fan 200 draws outside air into the silent cabin through the air duct cavity 130 for ventilation. During the ventilation process, the sound insulation hood 300 provides sound insulation, reducing the noise generated by ventilation from disturbing the users in the silent cabin.

[0030] Unlike axial fans where airflow flows along the axial direction of the blades, centrifugal fans (200) draw air in axially and then use centrifugal force to discharge the air perpendicular to the inlet direction, i.e., radially. This ensures sufficient airflow and pressure while preventing direct transmission of external noise. Furthermore, centrifugal fans (200) feature an internal rotor, providing excellent sealing, stable rotation, and low noise.

[0031] For example, the upper end of the soundproof hood 300 is provided with a frustum-shaped end cap 340. The surface of the end cap 340 is arc-shaped. An air inlet 330 communicating with the air inlet side of the fan 200 is provided in the middle of the end cap 340. The inner side of the end cap 340 is covered with a first sound-insulating sponge. The end cap 340 is frustum-shaped, the surface of the end cap 340 is arc-shaped, and an inner arc-shaped air inlet 330 is formed in the middle. The depth of the air inlet 330 is 25-28mm. Sound waves are reflected in the cavity formed by the end cap 340 and the soundproof board. The first sound-insulating sponge on the inner side of the end cap 340 can effectively absorb noise and reduce the airflow noise generated by the fan 200 during ventilation.

[0032] For example, the inner wall of the sound insulation panel is covered with a second sound insulation sponge. When the sound wave propagates along the axis into the cavity of the sound insulation hood 300, it will be reflected on the inner wall of the arc-shaped sound insulation panel 310. The second sound insulation sponge is laid on the inner wall of the sound insulation panel to absorb sound and reduce noise.

[0033] For example, the outer side of the sound insulation panel is provided with an outwardly protruding buckle 350, and the ventilation panel 100 is provided with a snap-fit ​​structure 110 on the outer side of the sound insulation panel. The buckle 350 snaps into the snap-fit ​​structure 110. The connection through the buckle 350 facilitates the disassembly and assembly of the sound insulation hood 300 and the ventilation panel 100. Moreover, the connection through the buckle 350 can avoid opening through holes in the ventilation panel 100, reducing the possibility of noise leaking into the soundproof chamber by passing through the ventilation panel 100 along the through holes.

[0034] For example, the bottom of the end cap 340 is provided with a positioning protrusion, and the ventilation plate 100 is provided with a positioning groove 120. The positioning protrusion is inserted into the positioning groove 120. The sound insulation hood 300 is positioned by the cooperation of the positioning protrusion and the positioning groove 120, so as to prevent the sound insulation hood 300 from rotating on the ventilation plate 100 and generating additional noise when it is working.

[0035] For example, the lower surface of the end cap 340 is coated with an EVA coating, and the outer wall of the sound insulation panel is coated with an EVA coating. The EVA material has a closed-cell structure, which can effectively absorb sound and reduce vibration. The closed-cell structure reduces the sound propagation path, thereby enhancing the sound insulation effect.

[0036] For example, the ventilation panel 100 is provided with a plurality of air outlets 140, and the air duct cavity 130 is connected to the external environment through the air outlets 140. By using multiple air outlets 140 for ventilation and air exchange, the air duct cavity 130 is connected to the soundproof chamber for ventilation and air exchange, avoiding the situation where only one air outlet 140 causes air to be ejected from only one air outlet 140, resulting in a large noise.

[0037] The advantages of implementing the silent fresh air system provided by this utility model compared with the prior art are as follows:

[0038] In this invention, the fan 200 rotates to intake and exchange air. The fan 200 is a centrifugal fan. Air enters the impeller 210 of the fan 200 along the axial direction. As the air flows through the impeller 210, it changes to a radial direction and is discharged from the radial side of the impeller 210. It then enters the air duct cavity 130 inside the ventilation plate 100 through the notch 320 of the soundproof hood 300 and is discharged through the ventilation plate 100, thus completing the ventilation. The ventilation plate 100 has a hollow structure. Air enters through one side of the fan 200 opening and exits through the ventilation plate 100, thus avoiding direct communication between the soundproof chamber and the external environment, which would affect the noise reduction effect. The soundproof hood 300 is equipped with two arc-shaped soundproof plates 310. The soundproof hood 300 covers the outside of the fan 200 to form a cylindrical cavity. Noise is generated by the intake of air from the centrifugal fan 200. When the sound waves travel along the axial direction... When sound waves enter the cavity of the soundproof hood 300, they are reflected on the inner wall of the arc-shaped soundproof panel 310. Certain frequencies of sound waves form standing waves in the cavity. The antinodes and nodes of these standing waves are fixed. When the sound-absorbing material is placed at the antinodes, it can absorb sound energy more effectively. The arc-shaped soundproof panel 310 can reduce sound scattering and diffraction caused by irregular shape, which is beneficial to controlling the direction of sound propagation. When sound-absorbing material is placed around it, the layout can be optimized according to the law of sound wave reflection to enhance the sound absorption effect. The arc-shaped soundproof panels 310 form a gap 320 that communicates with the air duct cavity 130, so that the air entering the impeller 210 of the fan 200 can enter the air duct cavity 130 along the direction of the gap 320 for air intake and ventilation. The structure of the soundproof hood 300 ensures that the centrifugal fan 200 can reduce noise when ventilating, thus achieving the effect of sound insulation and noise reduction.

[0039] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A silent fresh air system, characterized in that, It includes a fan, a soundproof hood, and a ventilation panel. The ventilation panel has a hollow structure. The fan is installed inside the ventilation panel, and the soundproof hood covers the outside of the fan. The fan is a centrifugal fan, the ventilation plate forms an air duct cavity inside, and the soundproof hood is provided with two arc-shaped soundproof plates that can be embedded in the ventilation plate. The two arc-shaped soundproof plates are arranged opposite each other, and a gap is formed between the two arc-shaped soundproof plates. The air outlet side of the fan is connected to the air duct cavity through the gap.

2. The silent fresh air system according to claim 1, characterized in that, The upper end of the soundproof hood is provided with a frustum-shaped end cap, the surface of which is arc-shaped, and the middle part of which is provided with an air inlet that communicates with the air inlet side of the fan.

3. The silent fresh air system according to claim 2, characterized in that, The inner side of the end cap is covered with a first sound-insulating sponge.

4. The silent fresh air system according to claim 2, characterized in that, The inner wall of the sound insulation panel is lined with a second sound insulation sponge.

5. The silent fresh air system according to claim 3, characterized in that, The sound insulation panel has outwardly protruding buckles on its outer side, and the ventilation panel has a snap-fit ​​structure on its outer side, with the buckles snapping into the snap-fit ​​structure.

6. The silent fresh air system according to claim 3, characterized in that, The bottom of the end cap is provided with a positioning protrusion, and the ventilation plate is provided with a positioning groove, and the positioning protrusion is inserted into the positioning groove.

7. The silent fresh air system according to any one of claims 2 to 6, characterized in that, The lower surface of the end cap is coated with an EVA coating, and the outer side wall of the sound insulation plate is coated with an EVA coating.

8. The silent fresh air system according to claim 1, characterized in that, The ventilation panel has several air outlets, and the air duct cavity is connected to the external environment through the air outlets.

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