Multi-layer staggered waterproofing and noise reduction structure

Abstract

The utility model relates to a kind of multi-layer staggered waterproof noise reduction structure, belong to exhaust silencer technical field, solve the problem of existing exhaust silencer waterproof cap exhaust obstruction and poor noise reduction effect in prior art.The utility model's multi-layer staggered waterproof noise reduction structure each layer includes multiple piece type waterproof silencing unit uniformly arranged along horizontal direction, and the piece type waterproof silencing unit of adjacent two layers is staggered and set to each other;Piece type waterproof silencing unit includes deflector and sound absorption chamber, deflector is set at the top of sound absorption chamber, for rainwater is received and is guided to the both sides of exhaust silencer.The utility model uses multi-layer staggered waterproof noise reduction structure, waterproof while not affecting exhaust, can also effectively reduce noise.

Description

Technical Field

[0001] This utility model relates to the field of exhaust muffler tower technology, and in particular to a multi-layered staggered waterproof and noise-reducing structure. Background Technology

[0002] When aircraft engines are tested on ground test stands, they emit high-temperature, high-pressure exhaust gases through exhaust mufflers, accompanied by significant noise pollution. Furthermore, the exhaust gas treatment devices of these mufflers are susceptible to precipitation and require waterproofing measures. The reliability and noise reduction effectiveness of the exhaust muffler equipment directly impact the smooth progress of testing and the control of noise in the surrounding environment. Therefore, it is necessary to design a waterproof exhaust muffler device that also provides noise reduction.

[0003] Existing simple waterproof cap designs have the following problems:

[0004] (1) Exhaust blockage problem: The exhaust gas discharged by the aircraft engine has the characteristics of high temperature and high pressure. If a waterproof cap is directly installed on the top of the tower, it may hinder its normal exhaust and affect the accuracy and safety of engine testing.

[0005] (2) Poor noise reduction effect: Compared with ordinary industrial equipment, the noise intensity generated by the aircraft engine test stand is far greater than that in the conventional field. Simply using sound-absorbing materials on the top of the tower cannot significantly reduce the noise, and may even cause the noise propagation direction to change and the noise impact range to expand.

[0006] In summary, existing exhaust muffler tower waterproofing devices are clearly inadequate in the harsh environment of aero-engine test benches, and there is an urgent need for a new solution that can both effectively reduce noise and ensure smooth exhaust flow. Utility Model Content

[0007] Based on the above analysis, the present invention aims to provide a multi-layered staggered waterproof and noise-reducing structure to solve the problems of exhaust blockage and poor noise reduction effect of existing exhaust muffler tower waterproof caps.

[0008] On the one hand, this utility model provides a multi-layer staggered waterproof and noise reduction structure. Each layer of the multi-layer staggered waterproof and noise reduction structure includes multiple sheet-type waterproof and noise-reducing units evenly arranged in the horizontal direction, and the sheet-type waterproof and noise-reducing units of adjacent layers are staggered with each other. The sheet-type waterproof and noise-reducing unit includes a guide plate and a sound-absorbing chamber. The guide plate is disposed on the top of the sound-absorbing chamber and is used to catch rainwater and guide it to both sides of the exhaust noise-reducing tower.

[0009] Furthermore, the multi-layered staggered waterproof and noise-reducing structure has 2-5 layers.

[0010] Furthermore, the projection of the multi-layered sheet-type waterproof silencing unit on the horizontal plane can fully cover the projection of the exhaust gas treatment device of the exhaust silencing tower on the horizontal plane.

[0011] Furthermore, the upper surface of the guide plate is provided with a guide groove, and the bottom of the guide groove is higher in the middle and lower on both sides.

[0012] Furthermore, the cross-section of the guide plate is V-shaped, U-shaped, or W-shaped.

[0013] Furthermore, when the cross-section of the guide plate is W-shaped, the height of the central protrusion is greater than the height of the two side edges.

[0014] Furthermore, the two ends of the guide plate extend beyond the two side edges of the sound-absorbing chamber and extend outward by a certain distance.

[0015] Furthermore, the interior of the sound-absorbing chamber is embedded with a sound-absorbing material that is resistant to high temperatures.

[0016] Furthermore, the sound-absorbing material is high-temperature glass fiber or ceramic fiber.

[0017] Furthermore, the bottom of the sound-absorbing chamber is semi-circular.

[0018] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0019] (1) Good waterproof effect: The multi-layer staggered waterproof and noise reduction structure effectively prevents rainwater, snow water and other water from directly entering the tower, ensuring safe operation for a long time.

[0020] (2) No impact on noise reduction effect: Waterproofing effect is achieved by setting a guide plate on the top of the sound absorption chamber, which has no adverse effect on the original noise reduction effect.

[0021] (3) Smooth exhaust: Prevents high-temperature exhaust gas from accumulating at the top of the tower, which has no adverse effect on engine performance and test results. By designing the cross-section of the guide vane as W-shaped, the aerodynamic losses of exhaust gas emissions from the exhaust muffler tower can be effectively reduced.

[0022] (4) Simple installation and maintenance: The system is simple in design, easy to install, and has low maintenance costs. It is suitable for various exhaust silencers of different specifications and does not affect the test process.

[0023] (5) Small space occupation: The exhaust silencer tower is equipped with multiple layers of silencer elements, leaving little space.

[0024] This invention does not occupy extra space in the exhaust muffler tower.

[0025] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages will become apparent from the description or be learned by practicing the invention. The objectives and other advantages of this invention can be realized and obtained from the description and accompanying drawings, which are particularly pointed out. Attached Figure Description

[0026] The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0027] Figure 1 This is a schematic diagram of the exhaust silencer tower structure of this utility model;

[0028] Figure 2 This is a schematic diagram of the multi-layered misaligned waterproof and noise-reducing structure of this utility model;

[0029] Figure 3 This is a schematic diagram of the structure of the sheet-type waterproof and noise-absorbing unit of this utility model, wherein (a) is a cross-sectional schematic diagram of the first type of sheet-type waterproof and noise-absorbing unit, (b) is a cross-sectional schematic diagram of the second type of sheet-type waterproof and noise-absorbing unit, and (c) is a cross-sectional view of the sheet-type waterproof and noise-absorbing unit along the length direction.

[0030] Figure label:

[0031] 1-Exhaust silencer tower; 2-Exhaust gas treatment device; 3-Panel waterproof silencer unit; 31-Baffle plate; 32-Sound absorption chamber. Detailed Implementation

[0032] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0033] Example 1

[0034] To achieve the above-mentioned objectives, this invention provides a multi-layered staggered waterproof and noise-reducing structure that combines the functions of smooth exhaust, protection, noise reduction, and waterproofing.

[0035] like Figure 1 As shown, the exhaust muffler tower 1 of the test bench is equipped with an exhaust gas treatment device 2 at its bottom. Above the exhaust gas treatment device 2, the multi-layered staggered waterproof and noise-reducing structure of this utility model is installed. See also Figure 2In this multi-layered staggered waterproof and noise-reducing structure, each layer includes multiple sheet-type waterproof and noise-reducing units 3 evenly arranged horizontally. A certain gap is maintained between every two sheet-type waterproof and noise-reducing units 3, and the sheet-type waterproof and noise-reducing units 3 of adjacent layers are staggered. The projection of the multi-layered sheet-type waterproof and noise-reducing units 3 onto the horizontal plane can completely cover the projection of the exhaust gas treatment device 2 onto the horizontal plane. This design prevents rainwater from directly entering the interior of the exhaust gas treatment device 2 while allowing exhaust gas to pass through smoothly.

[0036] See Figure 3 The sheet-type waterproof silencing unit 3 includes a guide plate 31 and a sound-absorbing chamber 32. The guide plate 31 is located on top of the sound-absorbing chamber 32 and is used to catch rainwater and guide it to both sides of the exhaust silencing tower 1 of the test stand, and then discharge it through the drainage system. The sound-absorbing chamber 32 is lined with porous sound-absorbing material to absorb noise.

[0037] The overall inclination of the guide plate 31 can be adjusted according to the size of the exhaust silencer tower 1 and the amount of precipitation. The cross-section of the guide plate 31 can be V-shaped, U-shaped, or other shapes that can realize the function of guiding fluid, so as to form a guide groove on the upper surface of the guide plate 31. The bottom of the guide groove is higher in the middle and lower on both sides, with an inclination angle of about 5°-15°, preferably 10°.

[0038] To address the exhaust emission characteristics of aero-engines, the traditional V-shaped guide channel is structurally optimized. Depending on the manufacturing complexity, the guide channel can be designed in various forms, with chamfers that allow for smooth transitions. In the preferred design, the guide plate 31 has a W-shaped cross-section, with the height of the central bulge exceeding the height of the side edges. Furthermore, the height of the central bulge is approximately twice the depth of the side grooves. This guide structure better conforms to aerodynamic principles, ensuring waterproofing while reducing aerodynamic losses.

[0039] In addition, when aerodynamic loss requirements are not high, the deflector 31 can extend outward beyond the edge of the sound-absorbing chamber 32 to achieve better waterproofing.

[0040] The bottom of the sound-absorbing chamber 32 is semi-circular to further reduce aerodynamic losses. The interior of the sound-absorbing chamber 32 is embedded with a high-temperature resistant sound-absorbing material, such as high-temperature glass fiber or ceramic fiber.

[0041] Considering the extreme weather conditions that may be encountered during aero-engine testing, both the deflector 31 and the sound-absorbing chamber 32 are made of corrosion-resistant, high-temperature-resistant, and moisture-proof materials, such as aluminum-magnesium alloy plates and multi-layer ceramic coatings. A drainage design is also incorporated into the surface of the deflector 31 to ensure that the device can operate normally under weather conditions such as rain, snow, and sandstorms, preventing rainwater and impurities from entering the exhaust gas treatment device 2. Antifreeze materials are also used to ensure normal operation in low-temperature environments.

[0042] During the test, the high-temperature, high-pressure exhaust gas generated by the aircraft engine was discharged through the exhaust silencer tower 1. The optimized W-shaped guide channel structure minimizes aerodynamic losses, and the multi-layered, staggered waterproof and noise-reducing structure prevents rainwater from directly entering the exhaust gas treatment device 2. Sound-absorbing materials inside the tower effectively absorb noise, minimizing its impact on the surrounding environment. In the face of extreme weather, the device's drainage, moisture-proof, and corrosion-resistant functions enhance its service life and stability.

[0043] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A multi-layered staggered waterproof and noise-reducing structure, characterized in that, Each layer of the multi-layer staggered waterproof and noise reduction structure includes multiple sheet-type waterproof and noise-absorbing units evenly arranged in the horizontal direction, and the sheet-type waterproof and noise-absorbing units of adjacent layers are staggered with each other; the sheet-type waterproof and noise-absorbing unit includes a guide plate and a sound-absorbing chamber, the guide plate is set on the top of the sound-absorbing chamber, and is used to catch rainwater and guide it to both sides of the exhaust noise-absorbing tower.

2. The multi-layered staggered waterproof and noise-reducing structure according to claim 1, characterized in that, The multi-layered staggered waterproof and noise-reducing structure consists of 2-5 layers.

3. The multi-layered staggered waterproof and noise-reducing structure according to claim 2, characterized in that, The projection of the multi-layered, sheet-type waterproof silencing unit on the horizontal plane can fully cover the projection of the exhaust gas treatment device of the exhaust silencing tower on the horizontal plane.

4. The multi-layered staggered waterproof and noise-reducing structure according to claim 3, characterized in that, The upper surface of the guide plate is provided with a guide groove, and the bottom of the guide groove is higher in the middle and lower on both sides.

5. The multi-layered staggered waterproof and noise-reducing structure according to claim 4, characterized in that, The cross-section of the guide plate is V-shaped, U-shaped, or W-shaped.

6. The multi-layered staggered waterproof and noise-reducing structure according to claim 5, characterized in that, When the cross-section of the guide plate is W-shaped, the height of the central protrusion is greater than the height of the two side edges.

7. The multi-layered staggered waterproof and noise-reducing structure according to claim 6, characterized in that, The two ends of the guide plate extend beyond the two side edges of the sound absorption chamber and outward for a certain distance.

8. The multi-layered staggered waterproof and noise-reducing structure according to claim 3, characterized in that, The sound-absorbing chamber is internally embedded with sound-absorbing material that is resistant to high temperatures.

9. The multi-layered staggered waterproof and noise-reducing structure according to claim 8, characterized in that, The sound-absorbing material is high-temperature glass fiber or ceramic fiber.

10. The multi-layered staggered waterproof and noise-reducing structure according to claim 8 or 9, characterized in that, The bottom of the sound-absorbing chamber is semi-circular.

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