Compact sound absorber curled cavity structure

Abstract

The utility model relates to the field of noise reduction structures, in particular to a compact sound absorber curled cavity structure which comprises a noise reduction box, a circulation mechanism is arranged on the outer side wall of the noise reduction box and comprises an air inlet pipe fixedly connected to one side of the noise reduction box, and an air outlet pipe is arranged on the side, away from the air inlet pipe, of the noise reduction box. A plurality of sets of air outlet holes are formed in the end, located in the noise reduction box, of the air outlet pipe, a conical block is arranged in the air outlet pipe, an oval groove is formed in the outer side wall of the conical block, the inner side wall of the conical block is in threaded connection with a threaded rod, one end of the threaded rod is fixedly connected with the bottom wall of the air outlet pipe, and a twisting block is fixedly connected to the outer side wall of the conical block. When flowing air is exhausted outwards from the interior of the air outlet pipe, the flowing air passing through the conical block is disturbed by the special shape of the conical block, then is dispersed and is difficult to resonate, so that the noise in the air outlet pipe is reduced, the position of the conical block can be adjusted by rotating the twisting block, the air supply amount is adjusted, and the noise is reduced.

Description

Technical Field

[0001] The utility model relates to the field of noise reduction structures, in particular to a compact sound absorbing body curling cavity structure. Background Art

[0002] Traditional absorption silencers made of porous and fibrous sound-absorbing materials can effectively absorb medium and high frequency noise, but have little effect on low frequency noise. Traditional reactive silencers are mainly resonant silencers and expansion chamber silencers: Resonant silencers such as Helmholtz silencers have good suppression performance for low frequency noise, but due to the resonant characteristics of the resonator, the silencer only has a noise reduction effect within a very narrow frequency band. Therefore, multiple resonators with different resonant frequencies are usually used in parallel / series to expand the noise reduction bandwidth.

[0003] After searching, the patent document with publication number CN116123381A proposes a wide-band sound-absorbing structure based on a curled cavity: the invention discloses a wide-band sound-absorbing structure based on a curled cavity, which relates to the field of noise reduction structures, including a sound-absorbing frame, a curled cavity, a sound inlet pipe, a sound outlet pipe and a local resonance unit, the interior of the sound-absorbing frame is provided with a curled cavity, and the upper and lower sides of the curled cavity are respectively connected to the sound inlet pipe and the sound outlet pipe, the curled cavity is divided into an S-shaped channel for sound flow by means of partition plates one and two, and the local resonance unit is provided at some corners of the S-shaped channel, the local resonance unit absorbs the noise propagated in the curled cavity through cavity resonance, and the present invention constructs a low-frequency, broadband, simple and light sound-absorbing structure based on the curled cavity structure.

[0004] Based on the above technical documents, when the technical solution is connected to the fan unit, when the flowing air is sent out through the sound outlet pipe, the flowing air will resonate internally to cause new noise, thereby weakening the noise reduction effect of the structure.

[0005] Therefore, it is necessary to invent a compact sound absorber curled cavity structure to solve the above problems. Utility Model Content

[0006] The purpose of the utility model is to provide a compact sound-absorbing body with a curled cavity structure, and the air outlet pipe is modified by cooperating with a noise reduction box and a circulation mechanism to weaken the influence of flowing air on the air outlet pipe, so as to solve the problem in the prior art that when the flowing air is sent out, the flowing air will resonate internally to cause new noise, thereby weakening the noise reduction effect of the structure.

[0007] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: a compact sound-absorbing body curled cavity structure, including a noise reduction box, an outer wall of the noise reduction box is provided with a circulation mechanism, the circulation mechanism includes an air inlet pipe fixedly connected to one side of the noise reduction box, an air outlet pipe is provided on the side of the noise reduction box away from the air inlet pipe, a plurality of groups of air outlet holes are provided at one end of the air outlet pipe located inside the noise reduction box, a conical block is provided inside the air outlet pipe and an elliptical groove is provided on the outer wall of the conical block, a threaded rod is threadedly connected to the inner wall of the conical block and one end of the threaded rod is fixedly connected to the bottom wall of the air outlet pipe, and a torsion block is fixedly connected to the outer wall of the conical block.

[0008] Preferably, two groups of partition plates are fixedly connected to the inner side wall of the noise reduction box, and a fixing frame is fixedly connected to the outer side of the partition plate.

[0009] Preferably, a porous sound-absorbing plate is fixedly connected to one side of the fixing frame, and the inner wall of the partition plate is filled with sound-absorbing cotton.

[0010] Preferably, two groups of irregular filling blocks are fixedly connected to the bottom wall of the noise reduction box, and the inner side walls of the irregular filling blocks are provided with silencer cavities.

[0011] Preferably, a sound inlet hole is formed on one side of the irregular filling block, and a sound outlet hole is formed on a side of the irregular filling block away from the sound inlet hole.

[0012] Preferably, a second sound-absorbing cotton is fixedly connected to the inner wall of the irregular filling block, and the second sound-absorbing cotton is located on one side of the sound outlet.

[0013] In the above technical solution, the technical effects and advantages provided by the utility model are:

[0014] Through the cooperation of the noise reduction box and the circulation mechanism, when the flowing air is discharged from the inside of the air outlet duct to the outside, the flowing air passing through the conical block is disturbed by its special shape, and then dispersed and difficult to resonate, thereby reducing the noise inside the air outlet duct. The position of the conical block can be adjusted by turning the twisting block, thereby adjusting the air supply volume to assist in reducing noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0016] Figure 1 It is a schematic diagram of the internal structure of the utility model;

[0017] Figure 2This is a schematic diagram of the internal structure of the partition plate of the utility model;

[0018] Figure 3 This is a schematic diagram of the circulation mechanism structure of the utility model;

[0019] Figure 4 For this utility model Figure 1 Enlarged structural diagram at A in the middle.

[0020] Description of reference numerals:

[0021] 1. Noise reduction box; 2. Circulation mechanism; 201. Air inlet pipe; 202. Air outlet pipe; 203. Air outlet hole; 204. Conical block; 205. Threaded rod; 206. Twisting block; 3. Partition plate; 4. Fixed frame; 5. Porous sound-absorbing board; 6. Irregular filling block; 601. Silencing chamber; 7. Sound-absorbing cotton one; 8. Sound inlet hole; 9. Sound outlet hole; 10. Sound-absorbing cotton two. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0023] The utility model provides Figure 1-4 A compact sound-absorbing body curled cavity structure shown in the figure comprises a noise reduction box 1, the outer wall of the noise reduction box 1 is provided with a circulation mechanism 2, the circulation mechanism 2 comprises an air inlet pipe 201 fixedly connected to one side of the noise reduction box 1, introducing the flowing air containing noise into the internal noise reduction box 1 for silencing, an air outlet pipe 202 is provided on the side of the noise reduction box 1 away from the air inlet pipe 201, discharging the flowing air containing noise, a plurality of groups of air outlet holes 203 are provided at one end of the air outlet pipe 202 located inside the noise reduction box 1, dividing the flowing air and realizing the circulation inside and outside, a conical block 204 is provided inside the air outlet pipe 202, and an elliptical groove is provided on the outer wall of the conical block 204 The inner wall of the conical block 204 is threadedly connected with a threaded rod 205, and one end of the threaded rod 205 is fixedly connected to the bottom wall of the air outlet pipe 202. The outer wall of the conical block 204 is fixedly connected with a twisting block 206. The conical block 204 can be moved on the outside of the threaded rod 205 by rotating the twisting block 206. When the flowing air is discharged from the inside of the air outlet pipe 202 to the outside, the flowing air passing through the conical block 204 is disturbed by its special shape, and then dispersed and difficult to resonate, thereby reducing the noise inside the air outlet pipe 202. The position of the conical block 204 can be adjusted by rotating the twisting block 206, thereby adjusting the air supply volume to help reduce noise.

[0024] Refer to the instruction manual Figure 1-4The inner wall of the noise reduction box 1 is fixedly connected with two groups of partition plates 3, and the outer side of the partition plate 3 is fixedly connected with a fixed frame 4. The multiple irregular holes on the porous sound-absorbing plate 5 are used to disrupt the airflow, and the partition plate 3 is used to make the refraction of the sound wave to eliminate its internal energy. The porous sound-absorbing plate 5 is fixedly connected to one side of the fixed frame 4. The inner wall of the partition plate 3 is filled with a sound-absorbing cotton 7, which cooperates with the partition plate 3 and the fixed frame 4 to further dissipate the energy of the sound wave. The bottom wall of the noise reduction box 1 is fixedly connected with two groups of irregular filling blocks 6. The irregular filling blocks 6 A silencer cavity 601 is provided on the inner wall to further increase the propagation path of the sound waves, thereby improving the energy dissipation effect, and cooperates with the partition plate 3 to use the sound pressure difference to cause the sound waves to move back and forth, and improve the space utilization rate, making the structure more compact. A sound inlet hole 8 is provided on one side of the irregular filling block 6, and a sound outlet hole 9 is provided on the side of the irregular filling block 6 away from the sound inlet hole 8. A sound-absorbing cotton 10 is fixedly connected to the inner wall of the irregular filling block 6, and the sound-absorbing cotton 10 is located on one side of the sound outlet hole 9 to further weaken the sound waves.

[0025] How this utility works:

[0026] Refer to the instruction manual Figure 1-4 When the noise reduction box 1 is needed to silence the sound waves, the sound waves are first allowed to enter the interior of the noise reduction box 1 through the air inlet pipe 201. When passing through the fixed frame 4, the airflow is disturbed by the multiple irregular holes on the porous sound absorbing plate 5, and the partition plate 3 is used to create refraction of the sound waves to eliminate its internal energy. When the sound waves pass through the irregular filling block 6, the propagation path of the sound waves is further increased, thereby improving the energy dissipation effect, and in cooperation with the partition plate 3, the sound pressure difference is used to cause the sound waves to move back and forth, and the space utilization rate is improved, making the structure more compact. Finally, when the sound waves come out from the interior of the irregular filling block 6 through the sound outlet hole 9, the sound absorbing cotton 10 is used to further weaken the sound waves.

[0027] Finally, when the sound waves pass through the inside of the air outlet duct 202, the flowing air passing through the conical block 204 is disturbed by its special shape, and then dispersed and difficult to resonate, thereby reducing the noise inside the air outlet duct 202. The position of the conical block 204 can be adjusted by rotating the twisting block 206, so that the air supply volume can be adjusted according to actual conditions to help reduce noise.

[0028] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A compact sound absorbing curled cavity structure, comprising a noise reduction box (1), characterized in that: The outer wall of the noise reduction box (1) is provided with a circulation mechanism (2), the circulation mechanism (2) comprising an air inlet pipe (201) fixedly connected to one side of the noise reduction box (1), an air outlet pipe (202) is provided on the side of the noise reduction box (1) away from the air inlet pipe (201), a plurality of groups of air outlet holes (203) are provided at one end of the air outlet pipe (202) located inside the noise reduction box (1), a conical block (204) is provided inside the air outlet pipe (202), and an elliptical groove is provided on the outer wall of the conical block (204), a threaded rod (205) is threadedly connected to the inner wall of the conical block (204), and one end of the threaded rod (205) is fixedly connected to the bottom wall of the air outlet pipe (202), and a twisting block (206) is fixedly connected to the outer wall of the conical block (204).

2. A compact sound absorber curled cavity structure according to claim 1, characterized in that: Two groups of partition plates (3) are fixedly connected to the inner side wall of the noise reduction box (1), and a fixing frame (4) is fixedly connected to the outer side of the partition plate (3).

3. A compact sound absorber curled cavity structure according to claim 2, characterized in that: A porous sound-absorbing plate (5) is fixedly connected to one side of the fixing frame (4), and the inner side wall of the partition plate (3) is filled with sound-absorbing cotton (7).

4. The compact sound absorber curled cavity structure according to claim 1, characterized in that: Two groups of irregular filling blocks (6) are fixedly connected to the bottom wall of the noise reduction box (1), and a silencer cavity (601) is provided on the inner side wall of the irregular filling block (6).

5. The compact sound absorber curled cavity structure according to claim 4, characterized in that: A sound inlet hole (8) is provided on one side of the irregular filling block (6), and a sound outlet hole (9) is provided on a side of the irregular filling block (6) away from the sound inlet hole (8).

6. The compact sound absorber curled cavity structure according to claim 4, characterized in that: The inner side wall of the irregular filling block (6) is fixedly connected with a second sound-absorbing cotton (10), and the second sound-absorbing cotton (10) is located on one side of the sound outlet hole (9).

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