A low-resistance rainproof and noise-reducing device for an air inlet

Abstract

The present invention provides a low-resistance rainproof and noise-reducing device for an air inlet, which includes an outer frame, a first sound absorption and insulation sheet detachably fixed to the upper part inside the outer frame through a fixing component, a second sound absorption and insulation sheet fixed to the bottom inside the outer frame, and a third sound absorption and insulation sheet detachably fixed inside the outer frame through a fixing component and arranged between the first sound absorption and insulation sheet and the second sound absorption and insulation sheet with uniform gaps; both the first sound absorption and insulation sheet and the third sound absorption and insulation sheet are designed in a bow shape. The sound absorption and insulation sheets of this device are in a bow shape, reducing the volume; there is no need for rainproof louvers, the windward surface is a non-perforated metal protection panel to block rain and snow from entering; the noise-facing surface is a perforated metal protection panel to absorb and consume sound energy; diversion arcs are provided at the air flow mutation points to reduce local pressure loss; the sound absorption and insulation sheets adopt fixing components that are convenient for disassembly, facilitating disassembly, cleaning and replacement. Under the condition of determining the noise reduction amount, this device can effectively reduce the volume, reduce the pressure loss and facilitate disassembly and assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of noise reduction, and particularly relates to a low-resistance rainproof and noise reduction device for an air inlet. Background Art

[0002] Currently, for rooms such as factories and control rooms with ventilation and heat dissipation requirements, in order to achieve the purpose of noise reduction, ventilation silencers are generally installed at the ventilation openings. For facades with rainproof requirements, rainproof louvers are generally installed on the outer surface of the silencers, which can effectively reduce the radiation of noise and the entry of rain and snow.

[0003] However, in many cases, due to space limitations and other requirements, such as installing a silencer at the air inlet of a factory building wall, the outer facade of the factory building needs to be flat for aesthetic reasons and does not allow protrusions, and the internal space is limited. Then, the effective length of the silencer is shortened. At the same time, in order to prevent rain from entering, rainproof louvers are installed on the outer facade of the silencer. After the effective length of the silencer is shortened, in order to ensure the noise reduction amount, the sound absorption and insulation sheets inside the silencer need to be inclined or bent, and the air flow changes from a straight flow to a curved flow when passing through the silencer, resulting in an increase in resistance; when there is a rainproof requirement, rainproof louvers need to be installed, which will inevitably increase the pressure loss while keeping the noise reduction amount unchanged, leading to an increase in energy consumption or problems such as poor ventilation; in addition, sometimes due to space limitations, there will be a problem of insufficient noise reduction amount when the pressure loss meets the requirements.

[0004] Therefore, there is an urgent need for a device that can not only ensure the effects of noise reduction and ventilation, but also reduce the pressure loss, and has a small volume and is easy to disassemble and replace without rainproof louvers. Summary of the Invention

[0005] The present invention is designed to solve the problems that the noise reduction device increases the pressure loss due to preventing rain and snow from entering, the noise reduction and ventilation effects become worse, and the volume is large and it is not easy to disassemble and replace. A low-resistance rainproof and noise reduction device for an air inlet is designed. The sound absorption and insulation sheets are in an arc shape to reduce the volume; there is no need for rainproof louvers, and the windward surface is a non-perforated metal protection panel to block rain and snow from entering; the noise-facing surface is a perforated metal protection panel to absorb and consume sound energy, and the windward surface is the back plate of the sound absorption and insulation sheet, which is not perforated, to block the propagation of direct sound and improve the noise reduction amount; guide arcs are provided at the air flow mutation points, there are no rainproof louvers, to reduce the local pressure loss, and the windward surface is a non-perforated protection panel to reduce the frictional pressure loss; the sound absorption and insulation sheets adopt detachable fixing components, which are convenient for disassembly, cleaning and replacement. This device can effectively shorten the length, reduce the volume, reduce the pressure loss, and is easy to disassemble and assemble under the condition of determining the noise reduction amount. It is suitable for places with space limitations, and is beautiful and convenient to use after installation.

[0006] The present invention provides a low-resistance rainproof and noise-reducing device for an air inlet, which includes an outer frame, a first sound-absorbing and sound-insulating sheet detachably fixed to the upper part inside the outer frame through a fixing component, a second sound-absorbing and sound-insulating sheet fixed to the bottom inside the outer frame, and a third sound-absorbing and sound-insulating sheet detachably fixed inside the outer frame and arranged between the first sound-absorbing and sound-insulating sheet and the second sound-absorbing and sound-insulating sheet with uniform gaps;

[0007] The outer frame includes an outer surface and an inner surface with through holes. A cavity is formed between the outer surface and the inner surface;

[0008] The first sound-absorbing and sound-insulating sheet includes a first upper windward surface, a first lower noise-facing surface, a first upper noise-facing surface, a first lower windward surface, an upper connection plane arranged between the first upper windward surface and the first upper noise-facing surface, a first lower connection arc surface arranged between the first lower noise-facing surface and the first lower windward surface, a first outer connection arc surface arranged between the first upper windward surface and the first lower noise-facing surface, and a first inner connection arc surface arranged between the first upper noise-facing surface and the first lower windward surface; The first upper windward surface, the upper connection plane, the first upper noise-facing surface, the first inner connection arc surface, the first lower windward surface, the first lower connection arc surface, the first lower noise-facing surface, and the first outer connection arc surface are connected to form a hollow flat-top bow-shaped outer shell structure. Through holes are opened on the first upper noise-facing surface and the first lower noise-facing surface, and the upper connection plane is closely attached to the inner upper surface of the inner surface;

[0009] The second sound-absorbing and sound-insulating sheet includes a second upper windward surface, a second upper noise-facing surface, a second upper connection arc surface arranged between the second upper windward surface and the second upper noise-facing surface, and a bottom surface, which are connected to form a hollow triangular structure with a smooth top. Through holes are opened on the second upper noise-facing surface, and the bottom surface is closely attached to the lower surface of the inner surface;

[0010] The third sound-absorbing and sound-insulating sheet includes a third upper windward surface, a third lower noise-facing surface, a third upper noise-facing surface, a third lower windward surface, a third upper connection arc surface arranged between the third upper windward surface and the third upper noise-facing surface, a third lower connection arc surface arranged between the third lower noise-facing surface and the third lower windward surface, a third outer connection arc surface arranged between the third upper windward surface and the third lower noise-facing surface, and a third inner connection arc surface arranged between the third upper noise-facing surface and the third lower windward surface. The third upper windward surface, the third upper connection arc surface, the third upper noise-facing surface, the third inner connection arc surface, the third lower windward surface, the third lower connection arc surface, the third lower noise-facing surface, and the third outer connection arc surface are connected to form a hollow bow-shaped outer shell structure. Through holes are opened on the third upper noise-facing surface and the third lower noise-facing surface;

[0011] The outer frame, the first sound-absorbing and sound-insulating sheet, the second sound-absorbing and sound-insulating sheet, and the third sound-absorbing and sound-insulating sheet are filled with sound-absorbing materials inside.

[0012] The low-resistance rainproof and noise reduction device for an air inlet described in the present invention is, as a preferred embodiment, further fixed on the vertical surface between the outer surface and the inner surface are a plurality of frame-shaped internal skeletons corresponding to the positions of the first sound-absorbing and insulating sheet and the third sound-absorbing and insulating sheet, the skeletons pass through the sound-absorbing material between the outer surface and the inner surface, and nuts are pre-embedded in the skeletons in the direction close to the inner surface.

[0013] The low-resistance rainproof and noise reduction device for an air inlet described in the present invention is, as a preferred embodiment, a fixing component including an angle iron, a screw for fixing the angle iron and the first sound-absorbing and insulating sheet or the third sound-absorbing and insulating sheet, and a clevis bolt threadedly connected to a nut, and one end of the angle iron close to the outer frame is supported or fixed on the clevis bolt.

[0014] The low-resistance rainproof and noise reduction device for air inlet of the present invention is preferably a sound-absorbing material of centrifugal glass wool with a bulk density of 32 kg / m 3 .

[0015] The low-resistance rainproof and noise reduction device for an air inlet described in the present invention is preferably configured such that the sound-absorbing material is melamine cotton or foamed aluminum or a composite material.

[0016] The low-resistance rainproof and noise reduction device for an air inlet described in the present invention is, as a preferred embodiment, the sound-absorbing material inside the first upper noise-facing surface, the first lower noise-facing surface, the second upper noise-facing surface, the third upper noise-facing surface, and the third lower noise-facing surface is wrapped with hydrophobic glass cloth.

[0017] The low-resistance rainproof and noise reduction device for an air inlet described in the present invention is, as a preferred embodiment, the distance between the third sound-absorbing and sound-insulating sheets is 80 mm, the distance between the third sound-absorbing and sound-insulating sheets and the first sound-absorbing and sound-insulating sheets is 80 mm, and the distance between the third sound-absorbing and sound-insulating sheets and the second sound-absorbing and sound-insulating sheets is 80 mm.

[0018] The low-resistance rainproof and noise reduction device for an air inlet described in the present invention is, as a preferred embodiment, the first upper noise-facing surface, the first lower noise-facing surface, the second upper noise-facing surface, the third upper noise-facing surface and the third lower noise-facing surface are aluminum alloy plates with a thickness of 1.2 mm, a pore diameter of 3 mm, and a perforation rate of not less than 23%.

[0019] The low-resistance rainproof and noise reduction device for an air inlet described in the present invention is, as a preferred embodiment, the first upper windward surface, the first lower windward surface, the upper connecting plane, the first lower connecting arc surface, the second upper windward surface, the second upper connecting arc surface, the bottom surface, the third upper windward surface, the third lower windward surface, the third upper connecting arc surface and the third lower connecting arc surface are hot-dip galvanized steel plates with a thickness of 1.2 mm.

[0020] The low-resistance rainproof and noise reduction device for an air inlet described in the present invention is preferably configured such that the first outer connecting arc surface, the first inner connecting arc surface, the third outer connecting arc surface and the third inner connecting arc surface are 1.0 mm hot-dip galvanized steel plates;

[0021] The outer surface and the inner surface are made of 1.5mm hot-dip galvanized sheet or composite material.

[0022] The first sound absorption and insulation sheet and the third sound absorption and insulation sheet of this device are both designed in an arc shape, which not only reduces the volume but also does not generate excessive resistance when air flows through.

[0023] Airflow, rain, snow, etc. enter through the first upper windward surface, the first lower windward surface, the upper connection plane, the first lower connection arc surface, the second upper windward surface, the second upper connection arc surface, the third upper windward surface, the third lower windward surface, the third upper connection arc surface, and the third lower connection arc surface of this device. These components are all non-perforated plates, which can prevent rain and snow from entering and do not hinder the entry of airflow.

[0024] Noise passes through the first upper noise-facing surface, the first lower noise-facing surface, the second upper noise-facing surface, the third upper noise-facing surface, and the third lower noise-facing surface of this device. These components are provided with through holes and filled with sound-absorbing materials inside, and have good sound absorption and insulation effects; the first upper windward surface, the first lower windward surface, the upper connection plane, the first lower connection arc surface, the second upper windward surface, the second upper connection arc surface, the third upper windward surface, the third lower windward surface, the third upper connection arc surface, and the third lower connection arc surface are all non-perforated plates and have good sound insulation effects.

[0025] The first outer connection arc surface, the first inner connection arc surface, the third inner connection arc surface, and the third outer connection arc surface of this device are arranged at the airflow mutation points, which can effectively reduce the local pressure loss.

[0026] The first sound absorption and insulation sheet and the second sound absorption and insulation sheet of this device are fixed by fixing components. Just gently lift the sound absorption and insulation sheet, and the toggle bolt can be unscrewed, and the sound absorption and insulation sheet can be placed on the lower sound absorption and insulation sheet, which is convenient for cleaning and replacement.

[0027] The present invention has the following advantages:

[0028] (1) By using arc-shaped sound absorption and insulation sheets, it can not only absorb sound but also insulate sound, and can allow airflow to pass through.

[0029] (2) According to the characteristic that the airflow direction and the noise direction are opposite to each other, the windward surface of the arc-shaped sound absorption and insulation sheet is set as a smooth metal non-perforated protection panel to reduce the frictional pressure loss; diversion arc surfaces are arranged at the airflow mutation points to reduce the local pressure loss; the noise-facing surfaces are all metal perforated protection panels, which can absorb and consume sound energy, thereby reducing the outward radiation of noise.

[0030] (3) The back-noise surface (i.e., the windward surface) of the arc-shaped sound absorption and insulation sheet is a metal non-perforated protection panel, which can play a good sound insulation role and greatly improve the noise reduction amount of the noise reduction device; on rainy and snowy days, this windward surface is the contact surface, which can block rainwater from entering, play a good rain-proof effect, and at the same time eliminate the need for rain louvers, reduce the obstruction when airflow passes through, and reduce the pressure loss.

[0031] (4) The bow-shaped sound absorption and insulation sheet has an improved noise reduction amount. Therefore, when the noise reduction amount is determined, the present invention can effectively shorten the length and reduce the volume, and can be applied to places with limited space. After installation, the overall appearance is beautiful;

[0032] (5) The bow-shaped sound absorption and insulation sheet of the noise reduction device is fixed by a convenient disassembly and assembly fixing component. When dust or other sundries fall on the surface of the bow-shaped sound absorption and insulation sheet and affect the ventilation or noise reduction effect and need to be cleaned, only need to slightly lift the bow-shaped sheet, and then the horn-shaped screw can be directly screwed out by hand. Then lower the bow-shaped sheet and place it on the bow-shaped sound absorption and insulation sheet below it. In this way, the space between the sheets increases, which is convenient for cleaning the ash residue; when a bow-shaped sound absorption and insulation sheet is damaged and needs to be replaced, adopt the above-described method. After dropping two bow-shaped sheets, there will be enough space to take out the third bow-shaped sheet that needs to be replaced. Description of the Drawings

[0033] Figure 1 It is the front view of a low-resistance rainproof and noise reduction device for the air inlet;

[0034] Figure 2 It is the cross-sectional view of a low-resistance rainproof and noise reduction device for the air inlet;

[0035] Figure 3 It is the cross-sectional view of the first sound absorption and insulation sheet of a low-resistance rainproof and noise reduction device for the air inlet;

[0036] Figure 4 It is the cross-sectional view of the second sound absorption and insulation sheet of a low-resistance rainproof and noise reduction device for the air inlet;

[0037] Figure 5 It is the cross-sectional view of the third sound absorption and insulation sheet of a low-resistance rainproof and noise reduction device for the air inlet;

[0038] Figure 6 It is the cross-sectional view of the outer frame of a low-resistance rainproof and noise reduction device for the air inlet;

[0039] Figure 7 It is the composition diagram of the fixing component of a low-resistance rainproof and noise reduction device for the air inlet;

[0040] Figure 8 It is the three-view drawing of the angle iron of the fixing component of a low-resistance rainproof and noise reduction device for the air inlet.

[0041] Reference Signs:

[0042] 1. Outer frame; 11. Outer surface; 12. Inner surface; 13. Framework; 14. Nut; 2. Fixing component; 21. Angle iron; 22. Screw; 23. U-bolt; 3. First sound absorption and insulation sheet; 31. First upper windward surface; 32. First lower noise-facing surface; 33. First upper noise-facing surface; 34. First lower windward surface; 35. Upper connection plane; 36. First lower connection arc surface; 37. First outer connection arc surface; 38. First inner connection arc surface; 4. Second sound absorption and insulation sheet; 41. Second upper windward surface; 42. Second upper noise-facing surface; 43. Second upper connection arc surface; 44. Bottom surface; 5. Third sound absorption and insulation sheet; 51. Third upper windward surface; 52. Third lower noise-facing surface; 53. Third upper noise-facing surface; 54. Third lower windward surface; 55. Third upper connection arc surface; 56. Third lower connection arc surface; 57. Third outer connection arc surface; 58. Third inner connection arc surface. Detailed implementation mode

[0043] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0044] Embodiment 1

[0045] As Figure 1 shown, a low-resistance rainproof and noise-reducing device for an air inlet includes an outer frame 1, a first sound absorption and insulation sheet 3 detachably fixed to the upper part inside the outer frame 1 through a fixing component 2, a second sound absorption and insulation sheet 4 fixed to the bottom inside the outer frame 1, and a third sound absorption and insulation sheet 5 detachably fixed inside the outer frame 1 through a fixing component 2 and arranged between the first sound absorption and insulation sheet 3 and the second sound absorption and insulation sheet 4 with uniform gaps.

[0046] As Figure 2 shown, the outer frame 1 includes an outer surface 11 and an inner surface 12 with through holes. A cavity is formed between the outer surface 11 and the inner surface 12, and sound-absorbing materials are filled inside.

[0047] As Figure 3As shown in the figure, the first sound absorption and insulation sheet 3 includes a first upper windward surface 31, a first lower noise-facing surface 32, a first upper noise-facing surface 33, a first lower windward surface 34, an upper connection plane 35 provided between the first upper windward surface 31 and the first upper noise-facing surface 33, a first lower connection arc surface 36 provided between the first lower noise-facing surface 32 and the first lower windward surface 34, a first outer connection arc surface 37 provided between the first upper windward surface 31 and the first lower noise-facing surface 32, and a first inner connection arc surface 38 provided between the first upper noise-facing surface 33 and the first lower windward surface 34; the first upper windward surface 31, the upper connection plane 35, the first upper noise-facing surface 33, the first inner connection arc surface 38, the first lower windward surface 34, the first lower connection arc surface 36, the first lower noise-facing surface 32, and the first outer connection arc surface 37 are connected to form a hollow flat-top bow-shaped outer shell structure, with sound-absorbing materials filled inside; through holes are provided on the first upper noise-facing surface 33 and the first lower noise-facing surface 32, and the upper connection plane 35 is closely attached to the upper surface of the inner surface 12.

[0048] As Figure 4 shown in the figure, the second sound absorption and insulation sheet 4 includes a second upper windward surface 41, a second upper noise-facing surface 42, a second upper connection arc surface 43 provided between the second upper windward surface 41 and the second upper noise-facing surface 42, and a bottom surface 44, which are connected to form a hollow triangular structure with a smooth top, with sound-absorbing materials filled inside; through holes are provided on the second upper noise-facing surface 42, and the bottom surface 44 is closely attached to the lower surface of the inner surface 12.

[0049] As Figure 5 shown in the figure, the third sound absorption and insulation sheet 5 includes a third upper windward surface 51, a third lower noise-facing surface 52, a third upper noise-facing surface 53, a third lower windward surface 54, a third upper connection arc surface 55 provided between the third upper windward surface 51 and the third upper noise-facing surface 53, a third lower connection arc surface 56 provided between the third lower noise-facing surface 52 and the third lower windward surface 54, a third outer connection arc surface 57 provided between the third upper windward surface 51 and the third lower noise-facing surface 52, and a third inner connection arc surface 58 provided between the third upper noise-facing surface 53 and the third lower windward surface 54; the third upper windward surface 51, the third upper connection arc surface 55, the third upper noise-facing surface 53, the third inner connection arc surface 58, the third lower windward surface 54, the third lower connection arc surface 56, the third lower noise-facing surface 52, and the third outer connection arc surface 57 are connected to form a hollow bow-shaped outer shell structure, with sound-absorbing materials filled inside; through holes are provided on the third upper noise-facing surface 53 and the third lower noise-facing surface 52.

[0050] Embodiment 2

[0051] As Figure 1As shown, a low-resistance rainproof and noise reduction device for an air inlet comprises an outer frame 1, a first sound-absorbing and insulating sheet 3 detachably fixed to an inner upper portion of the outer frame 1 through a fixing assembly 2, a second sound-absorbing and insulating sheet 4 fixed to an inner bottom portion of the outer frame 1, and a third sound-absorbing and insulating sheet 5 detachably fixed to the inner portion of the outer frame 1 through the fixing assembly 2 and evenly arranged with gaps between the first sound-absorbing and insulating sheet 3 and the second sound-absorbing and insulating sheet 4.

[0052] like Figure 2 As shown, the outer frame 1 includes an outer surface 11 and an inner surface 12 with through holes, and a cavity is formed between the outer surface 11 and the inner surface 12, and the cavity is filled with sound absorbing material.

[0053] like Figure 6 As shown, a plurality of frame-shaped internal skeletons 13 corresponding to the positions of the first sound-absorbing and insulating sheet 3 and the third sound-absorbing and insulating sheet 5 are fixed on the vertical surface between the outer surface 11 and the inner surface 12. The skeleton 13 passes through the sound-absorbing material between the outer surface 11 and the inner surface 12, and nuts 14 are pre-embedded in the skeleton 13 in the direction close to the inner surface 12.

[0054] like Figures 7 - 8 As shown, the fixing assembly 2 includes an angle iron 21, a screw 22 for fixing the angle iron 21 to the first sound absorbing and insulating sheet 3 or the third sound absorbing and insulating sheet 5, and a clevis bolt 23 threadedly connected to the nut 14, and one end of the angle iron 21 close to the outer frame 1 is supported or fixed on the clevis bolt 23.

[0055] like Figure 3 As shown, the first sound-absorbing and insulating sheet 3 includes a first upper windward surface 31, a first lower noise-facing surface 32, a first upper noise-facing surface 33, a first lower windward surface 34, an upper connecting plane 35 arranged between the first upper windward surface 31 and the first upper noise-facing surface 33, a first lower connecting arc surface 36 arranged between the first lower noise-facing surface 32 and the first lower windward surface 34, a first outer connecting arc surface 37 arranged between the first upper windward surface 31 and the first lower noise-facing surface 32, and a first outer connecting arc surface 38 arranged between the first upper noise-facing surface 33 and the first lower windward surface 34. The first inner connecting arc surface 38 between the lower windward surfaces 34; the first upper windward surface 31, the upper connecting plane 35, the first upper noise-facing surface 33, the first inner connecting arc surface 38, the first lower windward surface 34, the first lower connecting arc surface 36, the first lower noise-facing surface 32 and the first outer connecting arc surface 37 are connected to form a hollow flat-topped arched shell structure, and the interior is filled with sound-absorbing material; through holes are opened on the first upper noise-facing surface 33 and the first lower noise-facing surface 32, and the upper connecting plane 35 is closely attached to the inner upper surface of the inner surface 12.

[0056] like Figure 4As shown, the second sound absorption and insulation sheet 4 includes a second upper windward surface 41, a second upper noise-facing surface 42, a second upper connecting arc surface 43 disposed between the second upper windward surface 41 and the second upper noise-facing surface 42, and a bottom surface 44, which are connected to form a hollow triangular structure with a smooth top, and the interior is filled with sound-absorbing material; through holes are formed in the second upper noise-facing surface 42, and the bottom surface 44 is closely attached to the lower surface of the inner surface 12.

[0057] As Figure 5 shown, the third sound absorption and insulation sheet 5 includes a third upper windward surface 51, a third lower noise-facing surface 52, a third upper noise-facing surface 53, a third lower windward surface 54, a third upper connecting arc surface 55 disposed between the third upper windward surface 51 and the third upper noise-facing surface 53, a third lower connecting arc surface 56 disposed between the third lower noise-facing surface 52 and the third lower windward surface 54, a third outer connecting arc surface 57 disposed between the third upper windward surface 51 and the third lower noise-facing surface 52, a third inner connecting arc surface 58 disposed between the third upper noise-facing surface 53 and the third lower windward surface 54. The third upper windward surface 51, the third upper connecting arc surface 55, the third upper noise-facing surface 53, the third inner connecting arc surface 58, the third lower windward surface 54, the third lower connecting arc surface 56, the third lower noise-facing surface 52, and the third outer connecting arc surface 57 are connected to form a hollow bow-shaped outer shell structure, and the interior is filled with sound-absorbing material; through holes are formed in the third upper noise-facing surface 53 and the third lower noise-facing surface 52.

[0058] Embodiment 3

[0059] As Figure 1 shown, a low-resistance rainproof and noise-reducing device for an air inlet includes an outer frame 1, a first sound absorption and insulation sheet 3 detachably fixed to the upper part inside the outer frame 1 through a fixing component 2, a second sound absorption and insulation sheet 4 fixed to the bottom inside the outer frame 1, and a third sound absorption and insulation sheet 5 detachably fixed inside the outer frame 1 through the fixing component 2 and arranged between the first sound absorption and insulation sheet 3 and the second sound absorption and insulation sheet 4 with uniform gaps; the distance between the third sound absorption and insulation sheets 5 is 80 mm, the distance between the third sound absorption and insulation sheet 5 and the first sound absorption and insulation sheet 3 is 80 mm, and the distance between the third sound absorption and insulation sheet 5 and the second sound absorption and insulation sheet 4 is 80 mm.

[0060] As Figure 2 shown, the outer frame 1 includes an outer surface 11 and an inner surface 12 with through holes. A cavity is formed between the outer surface 11 and the inner surface 12, and the interior is filled with sound-absorbing material; the sound-absorbing material is centrifugal glass wool with a bulk density of 32 kg / m 3 , and the side close to the perforated facing panel is wrapped with hydrophobic glass cloth; when there is a cleanliness requirement, the sound-absorbing material is selected from melamine cotton, or foam aluminum, or composite materials;

[0061] The outer surface 11 and the inner surface 12 are made of 1.5 mm hot-dip galvanized steel sheet or composite material.

[0062] As Figure 6As shown, a plurality of frame-shaped internal skeletons 13 corresponding to the positions of the first sound-absorbing and insulating sheet 3 and the third sound-absorbing and insulating sheet 5 are fixed on the vertical surface between the outer surface 11 and the inner surface 12. The skeleton 13 passes through the sound-absorbing material between the outer surface 11 and the inner surface 12, and nuts 14 are pre-embedded in the skeleton 13 in the direction close to the inner surface 12.

[0063] like Figure 7 The fixing assembly 2 includes an angle iron 21, a screw 22 for fixing the angle iron 21 to the first sound absorbing and insulating sheet 3 or the third sound absorbing and insulating sheet 5, and a clevis bolt 23 threadedly connected to the nut 14, and one end of the angle iron 21 close to the outer frame 1 is supported or fixed on the clevis bolt 23. The screw 22 is a stainless steel self-tapping screw, M5.5×25mm, the angle iron 21 is L30×30×2mm, 40mm long, and the clevis bolt 23 is a stainless steel hand-tightened clevis screw, M10×35mm.

[0064] like Figure 3 As shown, the first sound-absorbing and insulating sheet 3 includes a first upper windward surface 31, a first lower noise-facing surface 32, a first upper noise-facing surface 33, a first lower windward surface 34, an upper connecting plane 35 arranged between the first upper windward surface 31 and the first upper noise-facing surface 33, a first lower connecting arc surface 36 arranged between the first lower noise-facing surface 32 and the first lower windward surface 34, a first outer connecting arc surface 37 arranged between the first upper windward surface 31 and the first lower noise-facing surface 32, and a first inner connecting arc surface 38 arranged between the first upper noise-facing surface 33 and the first lower windward surface 34; the upper connecting plane 35 is closely attached to the inner upper surface of the inner surface 12;

[0065] The first upper noise-facing surface 33 and the first lower noise-facing surface 32 are provided with through holes, which are made of aluminum alloy plates with a thickness of 1.2 mm, a hole diameter of 3 mm, and a perforation rate of not less than 23%;

[0066] The first upper windward surface 31, the first lower windward surface 34, the upper connecting plane 35, and the first lower connecting arc surface 36 are hot-dip galvanized steel plates with a thickness of 1.2 mm;

[0067] The first outer connecting arc surface 37, the first inner connecting arc surface 38, the third outer connecting arc surface 57 and the third inner connecting arc surface 58 are 1.0 mm hot-dip galvanized steel plates;

[0068] The first upper windward surface 31, the upper connecting plane 35, the first upper noise-facing surface 33, the first inner connecting arc surface 38, the first lower windward surface 34, the first lower connecting arc surface 36, the first lower noise-facing surface 32 and the first outer connecting arc surface 37 are connected to form a hollow flat-topped arched shell structure, which is filled with sound-absorbing material; the sound-absorbing material is centrifugal glass wool with a bulk density of 32 kg / m 3 , the side close to the perforated protective panel is wrapped with hydrophobic glass cloth; when cleanliness is required, melamine cotton, foam aluminum or composite materials are used as the sound-absorbing material.

[0069] As shown Figure 4 in FIG. 2, the second sound absorption and insulation sheet 4 includes a second upper windward surface 41, a second upper noise-facing surface 42, a second upper connecting arc surface 43 disposed between the second upper windward surface 41 and the second upper noise-facing surface 42, and a bottom surface 44, which are connected to form a hollow triangular structure with a smooth top, and the inside is filled with sound-absorbing material; the sound-absorbing material is centrifugal glass wool with a bulk density of 32 kg / m 3 , and it is wrapped with a water-repellent glass cloth on the side close to the perforated facing panel; when there is a cleanliness requirement, the sound-absorbing material is selected from melamine cotton, or foam aluminum, or composite material;

[0070] The second upper noise-facing surface 42 is provided with through holes, which are made of aluminum alloy plate with a thickness of 1.2 mm, a hole diameter of 3 mm, and a perforation rate of not less than 23%;

[0071] The second upper windward surface 41, the second upper connecting arc surface 43, and the bottom surface 44 are made of hot-dip galvanized steel plate with a thickness of 1.2 mm;

[0072] The bottom surface 44 is closely attached to the lower surface of the inner surface 12.

[0073] As shown Figure 5 in FIG. 3, the third sound absorption and insulation sheet 5 includes a third upper windward surface 51, a third lower noise-facing surface 52, a third upper noise-facing surface 53, a third lower windward surface 54, a third upper connecting arc surface 55 disposed between the third upper windward surface 51 and the third upper noise-facing surface 53, a third lower connecting arc surface 56 disposed between the third lower noise-facing surface 52 and the third lower windward surface 54, a third outer connecting arc surface 57 disposed between the third upper windward surface 51 and the third lower noise-facing surface 52, and a third inner connecting arc surface 58 disposed between the third upper noise-facing surface 53 and the third lower windward surface 54;

[0074] The third upper noise-facing surface 53 and the third lower noise-facing surface 52 are provided with through holes, which are made of aluminum alloy plate with a thickness of 1.2 mm, a hole diameter of 3 mm, and a perforation rate of not less than 23%;

[0075] The third upper windward surface 51, the third lower windward surface 54, the third upper connecting arc surface 55, and the third lower connecting arc surface 56 are made of hot-dip galvanized steel plate with a thickness of 1.2 mm;

[0076] The third outer connecting arc surface 57 and the third inner connecting arc surface 58 are made of 1.0 mm hot-dip galvanized steel plate;

[0077] The third upper windward surface 51, the third upper connecting arc surface 55, the third upper noise-facing surface 53, the third inner connecting arc surface 58, the third lower windward surface 54, the third lower connecting arc surface 56, the third lower noise-facing surface 52, and the third outer connecting arc surface 57 are connected to form a hollow bow-shaped shell structure, and the inside is filled with sound-absorbing material; the sound-absorbing material is centrifugal glass wool with a bulk density of 32 kg / m 3, it is wrapped with hydrophobic glass cloth on the side close to the perforated protection panel; when there is a cleanliness requirement, the sound-absorbing material is selected from melamine cotton, foam aluminum or composite materials.

[0078] The first sound-absorbing and sound-insulating sheet and the third sound-absorbing and sound-insulating sheet in Embodiments 1-3 are both designed in an arc shape, which not only reduces the volume but also does not generate too much resistance when the air flows through.

[0079] The air flow indicated by the arrow, rain, snow, etc. enter from the first upper windward surface, the first lower windward surface, the upper connection plane, the first lower connection arc surface, the second upper windward surface, the second upper connection arc surface, the third upper windward surface, the third lower windward surface, the third upper connection arc surface, and the third lower connection arc surface of the device. These components are all non-perforated plates, which can prevent rain and snow from entering and do not hinder the entry of air flow.

[0080] The noise indicated by the wavy line passes through the first upper noise-facing surface, the first lower noise-facing surface, the second upper noise-facing surface, the third upper noise-facing surface, and the third lower noise-facing surface. These components are provided with through holes and filled with sound-absorbing materials, and have good sound-absorbing and sound-insulating effects; the first upper windward surface, the first lower windward surface, the upper connection plane, the first lower connection arc surface, the second upper windward surface, the second upper connection arc surface, the third upper windward surface, the third lower windward surface, the third upper connection arc surface, and the third lower connection arc surface are all non-perforated plates and have good sound-insulating effects.

[0081] The first outer connection arc surface, the first inner connection arc surface, the third inner connection arc surface, and the third outer connection arc surface in Embodiments 1-3 are arranged at the air flow mutation points, which can effectively reduce the local pressure loss.

[0082] The first sound-absorbing and sound-insulating sheet and the second sound-absorbing and sound-insulating sheet in Embodiments 1-3 are fixed by fixing components. Just gently lift the sound-absorbing and sound-insulating sheet, and the horn bolt can be unscrewed, and the sound-absorbing and sound-insulating sheet can be placed on the lower sound-absorbing and sound-insulating sheet, which is convenient for cleaning and replacement.

[0083] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A low-resistance rainproof and noise reduction device for air inlet, Features: It comprises an outer frame (1), a first sound absorbing and insulating sheet (3) detachably fixed to the upper inner part of the outer frame (1) by means of a fixing assembly (2), a second sound absorbing and insulating sheet (4) fixed to the inner bottom of the outer frame (1), and a third sound absorbing and insulating sheet (5) detachably fixed to the inner part of the outer frame (1) by means of the fixing assembly (2) and arranged between the first sound absorbing and insulating sheet (3) and the second sound absorbing and insulating sheet (4) with uniform gaps; The outer frame (1) comprises an outer surface (11), an inner surface (12) with through holes, and a plurality of frame-shaped internal frames (13) fixed on the vertical surfaces between the outer surface (11) and the inner surface (12) and corresponding to the positions of the first sound-absorbing and insulating sheet (3) and the third sound-absorbing and insulating sheet (5); a cavity is formed between the outer surface (11) and the inner surface (12); the frame (13) passes through the sound-absorbing material between the outer surface (11) and the inner surface (12); and a nut (14) is pre-embedded inside the frame (13) in a direction close to the inner surface (12); The fixing assembly (2) comprises an angle iron (21), a screw (22) for fixing the angle iron (21) and the first sound-absorbing and insulating sheet (3) or the third sound-absorbing and insulating sheet (5), and a clevis bolt (23) threadedly connected to the nut (14); an end of the angle iron (21) close to the outer frame 1 is supported or fixed on the clevis bolt (23); The first sound absorbing and insulating sheet (3) comprises a first upper windward surface (31), a first lower noise-facing surface (32), a first upper noise-facing surface (33), a first lower windward surface (34), an upper connecting plane (35) arranged between the first upper windward surface (31) and the first upper noise-facing surface (33), a first lower connecting arc surface (36) arranged between the first lower noise-facing surface (32) and the first lower windward surface (34), a first outer connecting arc surface (37) arranged between the first upper windward surface (31) and the first lower noise-facing surface (32), and a first outer connecting arc surface (38) arranged between the first upper noise-facing surface (33) and the first lower windward surface (34). a first inner connecting arc surface (38) between the first upper windward surface (31), the first upper connecting plane (35), the first upper noise-facing surface (33), the first inner connecting arc surface (38), the first lower windward surface (34), the first lower connecting arc surface (36), the first lower noise-facing surface (32) and the first outer connecting arc surface (37) are connected to form a hollow flat-topped arched shell structure, the first upper noise-facing surface (33) and the first lower noise-facing surface (32) are provided with through holes, and the upper connecting plane (35) is closely attached to the inner upper surface of the inner surface (12); The second sound absorption and insulation sheet (4) includes a second upper windward surface (41), a second upper noise-facing surface (42), a second upper connecting arc surface (43) disposed between the second upper windward surface (41) and the second upper noise-facing surface (42), and a bottom surface (44), which are connected to form a hollow triangular structure with a smooth top. The second upper noise-facing surface (42) is provided with through holes, and the bottom surface (44) is closely attached to the lower surface of the inner surface (12); The third sound absorption and insulation sheet (5) includes a third upper windward surface (51), a third lower noise-facing surface (52), a third upper noise-facing surface (53), a third lower windward surface (54), a third upper connecting arc surface (55) disposed between the third upper windward surface (51) and the third upper noise-facing surface (53), a third lower connecting arc surface (56) disposed between the third lower noise-facing surface (52) and the third lower windward surface (54), a third outer connecting arc surface (57) disposed between the third upper windward surface (51) and the third lower noise-facing surface (52), and a third inner connecting arc surface (58) disposed between the third upper noise-facing surface (53) and the third lower windward surface (54). The third upper windward surface (51), the third upper connecting arc surface (55), the third upper noise-facing surface (53), the third inner connecting arc surface (58), the third lower windward surface (54), the third lower connecting arc surface (56), the third lower noise-facing surface (52), and the third outer connecting arc surface (57) are connected to form a hollow bow-shaped housing structure. The third upper noise-facing surface (53) and the third lower noise-facing surface (52) are provided with through holes; The sound absorption materials inside the first upper noise-facing surface (33), the first lower noise-facing surface (32), the second upper noise-facing surface (42), the third upper noise-facing surface (53), and the third lower noise-facing surface (52) are wrapped with hydrophobic glass cloth; the outer frame (1), the first sound absorption and insulation sheet (3), the second sound absorption and insulation sheet (4), and the third sound absorption and insulation sheet (5) are filled with sound absorption materials.

2. A low-resistance rainproof and noise-reducing device for an air inlet according to claim 1, characterized in that: The sound-absorbing material is centrifugal glass wool with a bulk density of 32 kg / m 3 .

3. A low-resistance rainproof and noise-reducing device for an air inlet according to claim 1, characterized in that: The sound absorption material is melamine cotton or aluminum foam or a composite material.

4. A low-resistance rainproof and noise-reducing device for an air inlet according to claim 1, characterized in that: The distance between the third sound absorption and insulation sheets (5) is 80 mm, the distance between the third sound absorption and insulation sheet (5) and the first sound absorption and insulation sheet (3) is 80 mm, and the distance between the third sound absorption and insulation sheet (5) and the second sound absorption and insulation sheet (4) is 80 mm.

5. A low-resistance rainproof and noise-reducing device for an air inlet according to claim 1, characterized in that: The first upper noise-facing surface (33), the first lower noise-facing surface (32), the second upper noise-facing surface (42), the third upper noise-facing surface (53) and the third lower noise-facing surface (52) are made of aluminum alloy plates with a thickness of 1.2 mm, a hole diameter of 3 mm, and a perforation rate of not less than 23%.

6. A low-resistance rain-proof and noise-reducing device for an air inlet according to claim 1, characterized in that: The first upper windward surface (31), the first lower windward surface (34), the upper connection plane (35), the first lower connection arc surface (36), the second upper windward surface (41), the second upper connection arc surface (43), the bottom surface (44), the third upper windward surface (51), the third lower windward surface (54), the third upper connection arc surface (55) and the third lower connection arc surface (56) are made of hot-dip galvanized steel plates with a thickness of 1.2 mm.

7. A low-resistance rain-proof and noise-reducing device for an air inlet according to claim 1, characterized in that: The first outer connection arc surface (37), the first inner connection arc surface (38), the third outer connection arc surface (57) and the third inner connection arc surface (58) are made of 1.0 mm hot-dip galvanized steel plates; The outer surface (11) and the inner surface (12) are made of 1.5 mm hot-dip galvanized plates or composite materials.

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