A sound insulation and noise reduction air duct for a wind tunnel laboratory

Abstract

The present invention relates to a sound insulation and noise reduction air duct for a wind tunnel laboratory, comprising an air duct main body and an air duct wall, and is characterized in that: the air duct wall encloses to form the air duct main body, the inner side of the air duct wall is fixedly connected to a fan mounting frame located on the left side of the air duct main body, the interior of the fan mounting frame is fixedly installed with a driving motor, the output end of the driving motor is fixedly connected to a supply fan blade through a coupling, the interior of the air duct wall is fixedly connected to a plurality of sound absorbing pipe bodies, and the sound absorbing pipe bodies are located on the right side of the supply fan blade; the outer side of the air duct wall is provided with a sound insulation layer and a protective outer wall located outside the sound insulation layer, the outer side of the protective outer wall is fixedly connected to a reinforcement frame, and the interior of the air duct wall is fixedly connected to a noise reduction pipe located between adjacent sound absorbing pipe bodies.

Description

Technical Field

[0001] The invention relates to a sound-insulating and noise-reducing air duct for a wind tunnel laboratory, and is applied in the technical field of wind tunnel laboratories. Background Art

[0002] As is well known, a wind tunnel, or wind tunnel laboratory, is a pipe-shaped experimental device that artificially generates and controls airflow to simulate the flow of gas around an aircraft or entity, measure the effect of airflow on the entity, and observe physical phenomena. It is one of the most commonly used and effective tools for conducting aerodynamic experiments. Wind tunnel experiments are an indispensable part of aircraft development. They not only play an important role in the research and development of aviation and aerospace engineering, but with the development of industrial aerodynamics, they are even more indispensable in transportation, housing construction, and wind energy utilization. This experimental method makes flow conditions easy to control. During the experiment, a model or actual object is often fixed in the wind tunnel and repeatedly blown with air, and experimental data is obtained through measurement and control instruments and equipment.

[0003] However, due to the use of dual fans in wind tunnel laboratories, the airflow is very fast during operation, which generates a lot of noise in the duct. Research data shows that when the noise reaches 60 decibels, people will feel noisy, 70 decibels will begin to damage the auditory nerves, and hearing will be damaged above 90 decibels. Staying in a space of 100-120 decibels will cause temporary deafness for one minute. In addition, noise can also affect children's intelligence and fetal development, and induce various diseases such as arrhythmia, high blood pressure, and indigestion. The degree of harm mainly depends on the frequency, intensity, and exposure time of the noise. When the noise generated by the dual fans in the wind tunnel experiment spreads outward in the duct, it will have a significant impact on the working environment and even the surrounding residents. In serious cases, it can even affect the health of the experimenters. Therefore, a soundproof and noise-reducing duct for wind tunnel laboratories is proposed. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a sound insulation and noise reduction air duct for a wind tunnel laboratory, which has the advantages of sound insulation and noise reduction, reducing the impact of noise on the surroundings, and good noise reduction effect. It solves the problem that when the current wind tunnel laboratory uses dual fans, the air flow flows quickly, and very loud noise is generated in the air duct. The outward spread has a great impact on the working environment and even the surrounding residents, and in serious cases, it may even affect the health of the experimenters.

[0005] The technical solutions of the present invention are as follows:

[0006] A sound-insulating and noise-reducing air duct for a wind tunnel laboratory comprises an air duct main body and an air duct wall, and is characterized in that: the air duct wall encloses to form the air duct main body, the inner side of the air duct wall is fixedly connected to a fan mounting frame located on the left side of the air duct main body, a driving motor is fixedly installed inside the fan mounting frame, the output end of the driving motor is fixedly connected to a supply fan blade via a coupling, a plurality of sound-absorbing pipe bodies are fixedly connected inside the air duct wall, and the sound-absorbing pipe bodies are located on the right side of the supply fan blade; a sound-blocking layer and a protective outer wall located outside the sound-blocking layer are provided on the outer side of the air duct wall, a reinforcement frame is fixedly connected to the outer side of the protective outer wall, and a noise reduction pipe located between adjacent sound-absorbing pipe bodies is fixedly connected inside the air duct wall.

[0007] The inner side of the air duct wall is provided with a plurality of auxiliary sound-reducing holes distributed in a ring shape, and the outer side of the air duct wall is fixedly connected with a plurality of external sound-reducing pipes located inside the sound-resistance layer, and the auxiliary sound-reducing holes connect the external sound-reducing pipes and the air duct body.

[0008] A plurality of main support blocks and support angle plates located inside the sound-insulating layer are fixedly connected between the air duct wall and the protective outer wall, and the main support blocks are at the same height as the outer silencer pipe.

[0009] The outer silencer pipe is a reactive silencer, and the main support blocks and the outer silencer pipe are staggered.

[0010] The reinforcement frame includes a plurality of annular rods and a plurality of connecting rods. The annular rods and the connecting rods are distributed in a grid-like staggered manner. The reinforcement frame is adapted to the protective outer wall.

[0011] A plurality of equally spaced noise reduction strips are fixedly connected to the inner side of the noise reduction pipe, arc plates are fixedly connected to both sides of the noise reduction strips, and an air inlet and an air outlet are respectively provided at the left end and the right end of the noise reduction pipe.

[0012] The noise reduction strip is a fabric sound-absorbing panel, and the arc panels on both sides of the noise reduction strip are symmetrical to each other.

[0013] The left side of the air inlet is inclined outwards at 15 degrees, and the right side of the air outlet is inclined inwards at 15 degrees.

[0014] The sound-absorbing pipe body is composed of an inner porous thin steel plate and glass fiber yarns filled in the porous thin steel plate, and the outer side of the porous thin steel plate is fixedly connected to the air duct wall.

[0015] The present invention has the following beneficial effects:

[0016] The wind tunnel laboratory uses a sound-insulating and noise-reducing air duct. Through the staggered arrangement of multiple sound-absorbing tubes and noise-reducing tubes, the noise generated can be reduced after multiple absorption by the sound-absorbing tubes and noise-reducing tubes. The airflow is guided at the air inlet and outlet to reduce the impact of the airflow on the sound-absorbing tubes. The noise-reducing strips and arc plates make the generated air flow have a certain arc shape, reducing the flow velocity loss of the airflow in the sound-absorbing tubes and noise-reducing tubes, ensuring the normal operation of the air duct body without affecting the experiments in the wind tunnel laboratory. The residual noise is guided to the external silencer through the auxiliary sound-reducing holes to eliminate the noise, keep the noise in the air duct body lower, and reduce the impact on the surrounding environment and the health of the experimenters. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] Figure 2 AA is a schematic diagram of the cross-sectional structure of the present invention;

[0019] Figure 3 This is a front view of the external structure of the present invention;

[0020] Figure 4 For the present invention Figure 1 Schematic diagram of the enlarged structure at B in the middle;

[0021] The reference numerals in the figures are as follows:

[0022] 1. Air duct body; 11. Fan mounting frame; 12. Drive motor; 13. Supply fan blades; 14. Sound-absorbing pipe body; 2. Air duct wall; 21. Auxiliary sound-reduction holes; 3. Sound-resistance layer; 31. External silencer pipe; 32. Main support block; 33. Support angle plate; 4. Protective outer wall; 5. Reinforcement frame; 51. Ring rod; 52. Connecting rod; 6. Noise reduction pipe; 61. Noise reduction strip; 62. Arc plate; 63. Air inlet; 64. Air outlet. DETAILED DESCRIPTION

[0023] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] See also Figures 1 to 4The sound insulation and noise reduction air duct for a wind tunnel laboratory comprises an air duct main body 1 and an air duct wall 2, the air duct wall 2 encloses the air duct main body 1, the inner side of the air duct wall 2 is fixedly connected to a fan mounting frame 11 located on the left side of the air duct main body 1, the interior of the air duct mounting frame 11 is fixedly installed with a driving motor 12, the output end of the driving motor 12 is fixedly connected to a supply fan blade 13 through a coupling, the interior of the air duct wall 2 is fixedly connected with a plurality of sound absorbing pipe bodies 14, and the sound absorbing pipe body 14 is located on the right side of the supply fan blade 13; the outer side of the air duct wall 2 is provided with a sound insulation layer 3 and a protective outer wall 4 located outside the sound insulation layer 3, the outer side of the protective outer wall 4 is fixedly connected with a reinforcement frame 5, the interior of the air duct wall 2 is fixedly connected with a noise reduction pipe 6 located between adjacent sound absorbing pipe bodies 14, the sound absorbing pipe body 14 and the noise reduction pipe 6 are arranged in cooperation, and can perform multiple absorption of noise inside the air duct when the dual fans are working, thereby achieving the effect of reducing noise.

[0025] The inner side of the air duct wall 2 is provided with a plurality of auxiliary sound-reducing holes 21 distributed in a ring shape, and the outer side of the air duct wall 2 is fixedly connected with a plurality of external sound-reducing pipes 31 located inside the sound-blocking layer 3, and the auxiliary sound-reducing holes 21 connect the external sound-reducing pipes 31 and the air duct body 1.

[0026] A plurality of main support blocks 32 and support angle plates 33 located inside the sound-insulating layer 3 are fixedly connected between the air duct wall 2 and the protective outer wall 4 . The main support blocks 32 are at the same height as the outer silencer pipe 31 .

[0027] The outer silencer pipe 31 is a reactive silencer, and the main support blocks 32 and the outer silencer pipe 31 are arranged alternately.

[0028] The reinforcement frame 5 includes a plurality of annular rods 51 and a plurality of connecting rods 52 . The annular rods 51 and the connecting rods 52 are staggered and distributed in a network shape. The reinforcement frame 5 is adapted to protect the outer wall 4 .

[0029] A plurality of equally spaced noise reduction strips 61 are fixedly connected to the inner side of the noise reduction pipe 6, and arc plates 62 are fixedly connected on both sides of the noise reduction strips 61. An air inlet 63 and an air outlet 64 are respectively provided at the left and right ends of the noise reduction pipe 6. The special structure of the air inlet 63 and the air outlet 64 can play a role in guiding the flow, effectively reducing the impact force of the airflow on the sound-absorbing tube body 14.

[0030] The noise reduction strip 61 is a fabric sound-absorbing panel, and the arc plates 62 on both sides of the noise reduction strip 61 are symmetrical to each other. The arrangement of the arc plates 62 enables the air to produce an arc-shaped motion when flowing outside the noise reduction strip 61, effectively reducing its flow speed, and thereby reducing the noise generated by the impact of the air when flowing in the air duct main body 1 under the action of the noise reduction strip 61.

[0031] The left side of the air inlet 63 is inclined outward at 15 degrees, and the right side of the air outlet 64 is inclined inward at 15 degrees. The inclinations defined by the air inlet 63 and the air outlet 64 can reduce the impact force of the airflow on the sound-absorbing tube body 14 to an optimal state.

[0032] The sound-absorbing tube body 14 is composed of an inner porous thin steel plate and glass fiber yarns filled in the porous thin steel plate, and the outer side of the porous thin steel plate is fixedly connected to the air duct wall 2.

[0033] Working principle of the present invention:

[0034] When using the present invention, multiple sound-absorbing tube bodies 14 and noise reduction tubes 6 are staggered and arranged. The noise generated can be reduced by multiple absorption of the sound-absorbing tube bodies 14 and the noise reduction tubes 6. The air inlet 63 and the air outlet 64 guide the airflow to reduce the impact of the airflow on the sound-absorbing tube body 14. The noise reduction strips 61 and the arc plates 62 make the generated air flow have a certain arc shape, reducing the flow velocity loss of the airflow in the sound-absorbing tube body 14 and the noise reduction tube 6, ensuring the normal operation of the air duct main body 1 without affecting the experiments in the wind tunnel laboratory. The residual noise is guided to the external silencer 31 through the auxiliary sound reduction hole 21 to eliminate the noise, keep the noise in the air duct main body 1 smaller, and reduce the impact on the surrounding environment. On the premise of ensuring the normal operation of the air duct main body 1 and not affecting the experiments in the wind tunnel laboratory, the impact on the surrounding environment and the health of the experimenters is effectively reduced.

[0035] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention's description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A sound-insulating and noise-reducing air duct for a wind tunnel laboratory, characterized by: The invention comprises an air duct body (1) and an air duct wall (2), and is characterized in that: the air duct wall (2) encloses the air duct body (1), the inner side of the air duct wall (2) is fixedly connected to a fan mounting frame (11) located on the left side of the air duct body (1), the interior of the fan mounting frame (11) is fixedly installed with a driving motor (12), the output end of the driving motor (12) is fixedly connected to a supply fan blade (13) through a coupling, the interior of the air duct wall (2) is fixedly connected with a plurality of sound-absorbing pipe bodies (14), and the sound-absorbing pipe bodies (14) are located on the right side of the supply fan blade (13); the outer side of the air duct wall (2) is provided with a sound-proof layer (3) and a protective outer wall (4) located outside the sound-proof layer (3) The outer side of the protective outer wall (4) is fixedly connected to a reinforcement frame (5); the interior of the air duct wall (2) is fixedly connected to a noise reduction pipe (6) located between adjacent sound-absorbing pipe bodies (14); the inner side of the noise reduction pipe (6) is fixedly connected to a plurality of equally spaced noise reduction strips (61); both sides of the noise reduction strips (61) are fixedly connected to arc plates (62); the left end and the right end of the noise reduction pipe (6) are respectively provided with an air inlet (63) and an air outlet (64); the sound-absorbing pipe body (14) is composed of an inner porous thin steel plate and glass fiber yarns filled in the porous thin steel plate, and the outer side of the porous thin steel plate is fixedly connected to the air duct wall (2).

2. The sound-insulating and noise-reducing air duct for a wind tunnel laboratory according to claim 1, characterized in that: The inner side of the air duct wall (2) is provided with a plurality of auxiliary sound-reducing holes (21) distributed in a ring shape, and the outer side of the air duct wall (2) is fixedly connected with a plurality of external sound-reducing pipes (31) located inside the sound-resistance layer (3), and the auxiliary sound-reducing holes (21) are connected to the external sound-reducing pipes (31) and the air duct body (1).

3. The sound-insulating and noise-reducing air duct for a wind tunnel laboratory according to claim 1, characterized in that: A plurality of main support blocks (32) and support angle plates (33) located inside the sound-insulating layer (3) are fixedly connected between the air duct wall (2) and the protective outer wall (4), and the main support blocks (32) are at the same height as the outer muffler pipe (31).

4. The sound-insulating and noise-reducing air duct for a wind tunnel laboratory according to claim 3, characterized in that: The outer silencer pipe (31) is a reactive silencer, and the main support block (32) and the outer silencer pipe (31) are staggered.

5. The sound-insulating and noise-reducing air duct for a wind tunnel laboratory according to claim 1, characterized in that: The reinforcement frame (5) comprises a plurality of annular rods (51) and a plurality of connecting rods (52). The annular rods (51) and the connecting rods (52) are distributed in a mesh-like staggered manner. The reinforcement frame (5) is adapted to the protective outer wall (4).

6. The sound-insulating and noise-reducing air duct for a wind tunnel laboratory according to claim 1, characterized in that: The noise reduction strip (61) is a fabric sound-absorbing board, and the arc plates (62) on both sides of the noise reduction strip (61) are symmetrical to each other.

7. The sound-insulating and noise-reducing air duct for a wind tunnel laboratory according to claim 1, characterized in that: The left side of the air inlet (63) is tilted outwards by fifteen degrees.

8. The sound-insulating and noise-reducing air duct for a wind tunnel laboratory according to claim 1, characterized in that: The right side of the air outlet (64) is tilted inwards by 15 degrees.

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