Sound-permeable airtight acoustic liner structure suitable for noise reduction of fan and air duct

Abstract

The invention relates to the technical field of fan noise reduction, and discloses a sound-transmitting airtight sound liner structure suitable for fan noise reduction and an air duct, the sound-transmitting airtight sound liner structure suitable for fan noise reduction comprises a sound-transmitting layer suitable for blocking airflow and sound; one side of the back cavity is connected with the sound transmission layer, and openings are formed in the two ends of the back cavity; the back plate covers an opening in one side, far away from the sound transmission layer, of the back cavity; the perforated plate is suitable for being connected with one side of the sound transmission layer; and a plurality of through holes are formed in the perforated plate. According to the scheme, airflow and sound pass through the sound transmission layer through the through holes in the perforated plate, the sound can enter the back cavity, the airflow cannot enter the back cavity, the low-frequency-band 400-1000 Hz noise of the fan can be effectively reduced, the influence of the fan noise on the far-field sound environment is reduced, and the overall structure is simple, and the maintenance cost is low.

Description

Technical Field

[0001] The present invention relates to the technical field of fans, and in particular to a sound-permeable and air-tight lining structure and an air duct suitable for reducing noise of fans. Background Art

[0002] Axial fans are widely used in industrial heat dissipation and airflow exchange. During their operation, they will generate single-frequency noise and broadband noise. In order to reduce the impact of noise on people, it is a common practice to perform noise reduction on the fan. Traditional fan noise control mainly includes: 1) starting from reducing the intensity of the sound source, including optimizing the airfoil and adopting a noise reduction design scheme, but this type of technology usually affects the aerodynamic performance of the fan, reducing efficiency or exhaust volume. 2) Installing a muffler in the exhaust duct, usually a resistive muffler. The disadvantage of this type of technology is that it will produce a large resistance loss, reduce efficiency and exhaust volume. The acoustic lining device uses the resonance principle to achieve the consumption and absorption of sound energy and is widely used in the field of aircraft engines. The acoustic lining generally includes a perforated panel, a honeycomb back cavity and a rigid bottom plate. In order to consume the sound energy from the sound propagation path, the acoustic lining can be installed on the side wall of the pipe to absorb the noise. Since the surface of the acoustic lining is a micro-perforated plate structure, the fan will interact with the flow in the small hole when passing through, thereby affecting the aerodynamic performance of the fan. Therefore, the present invention proposes a sound lining device suitable for fan noise reduction. Summary of the invention

[0003] In view of this, the present invention provides a sound-permeable and airtight lining structure and air duct suitable for fan noise reduction, so as to solve the problem that the fan will interact with the flow in the small holes when passing through, thereby affecting the aerodynamic performance of the fan.

[0004] In a first aspect, the present invention provides a sound-permeable and airtight lining structure suitable for fan noise reduction, comprising:

[0005] A sound-permeable layer, suitable for blocking the passage of airflow and suitable for the passage of sound;

[0006] A back cavity, one side of which is connected to the sound-transmitting layer, and both ends of the back cavity have openings;

[0007] a partition plate, arranged in the back cavity;

[0008] A back plate, covering an opening of the back cavity on a side away from the sound-transmitting layer;

[0009] The perforated plate is suitable for being connected to one side of the sound-transmitting layer; the perforated plate is provided with a plurality of through holes.

[0010] In this solution, airflow and sound pass through the sound-transmitting layer through the holes in the perforated plate, where the sound can enter the back cavity, but the airflow cannot enter. The back cavity effectively reduces the noise of the fan in the low-frequency band of 400-1000Hz, reduces the impact of the fan noise on the far-field sound environment, and the overall structure of this solution is simple and the maintenance cost is low.

[0011] In an optional embodiment, the perforated plate is arranged on a side of the sound-transmitting layer away from the back cavity.

[0012] In an optional embodiment, the sound-transmitting layer is connected to the perforated plate by bonding.

[0013] In an optional implementation, the back cavity is connected to the back plate by bonding.

[0014] In an optional implementation, the back cavity is made of stainless steel.

[0015] In an optional implementation, the back plate is made of stainless steel.

[0016] In an optional implementation, the sound-transmitting layer is made of PVF film.

[0017] In an optional embodiment, the back cavity is divided into a plurality of sound-absorbing spaces, and the sound-absorbing spaces are suitable for eliminating noise.

[0018] In the second aspect, the present invention also provides an air duct, comprising any one of the above-mentioned sound-permeable and airtight lining structures suitable for fan noise reduction, the inner wall of the air duct is provided with a mounting hole, the perforated plate is suitable for being fixed at the mounting hole and suitable for airflow and noise to pass through.

[0019] In this solution, since the sound lining structure is installed on the side wall of the fan channel through the installation hole, it will not increase the running resistance of the fan.

[0020] In an optional implementation, it also includes:

[0021] The fan is suitable for being arranged in the air duct. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1The present invention is a schematic diagram of the overall structure of a sound-permeable and airtight sound lining structure suitable for fan noise reduction according to an embodiment of the present invention.

[0024] Figure 2 The figure is a schematic diagram of the back cavity of a sound-permeable and airtight sound lining structure suitable for fan noise reduction.

[0025] Figure 3 The figure is a schematic diagram of a perforated plate with a sound-permeable and air-impermeable sound lining structure suitable for fan noise reduction.

[0026] Figure 4 The figure is a schematic diagram of an air duct according to an embodiment of the present invention.

[0027] Figure 5 It is a comparison diagram of the embodiment of the present invention with and without the sound lining.

[0028] Figure 6 It is a comparison diagram of the embodiment of the present invention with and without the sound-transmitting layer.

[0029] Description of reference numerals:

[0030] 1. Perforated plate; 2. Sound-transmitting layer; 3. Back cavity; 4. Back plate; 5. Partition plate; DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0032] Example 1

[0033] like Figure 1 As shown, the present invention provides a sound-permeable and air-impermeable sound lining structure suitable for fan noise reduction, comprising:

[0034] The sound-permeable layer 2 is suitable for blocking the passage of airflow and allowing sound to pass through;

[0035] A back cavity 3, one side of which is connected to the sound-transmitting layer, and both ends of the back cavity have openings;

[0036] A partition 5 is arranged in the back cavity 3;

[0037] A back plate 4, covering an opening of the back cavity 3 on a side away from the sound-transmitting layer 2;

[0038] The perforated plate 1 is suitable for being connected to one side of the sound-transmitting layer 2 ; the perforated plate 1 has a plurality of through holes therein.

[0039] It should be noted that the back cavity is a square tube with openings at both ends.

[0040] like Figure 2 and Figure 3 As shown, in this solution, airflow and sound pass through the through holes in the perforated plate 1 and the sound-transmitting layer 2, wherein the sound can enter the back cavity 3, but the airflow cannot enter, wherein the back cavity 3 effectively reduces the noise of the fan in the low-frequency band of 400-1000Hz, reduces the impact of the fan noise on the far-field sound environment, and the overall structure of this solution is simple and the maintenance cost is low.

[0041] In an optional implementation, the perforated plate 1 is arranged on a side of the sound-transmitting layer 2 away from the back cavity 3 .

[0042] It should be noted that the sound-transmitting layer 2 is bonded to the outer surface or the inner surface of the perforated plate 1 and is connected to the open side of the back cavity as a whole.

[0043] In an optional embodiment, the sound-transmitting layer 2 is connected to the perforated plate 1 by bonding.

[0044] In an optional implementation, the back cavity 3 is connected to the back plate 4 by bonding.

[0045] In an optional implementation, the back cavity 3 is made of stainless steel.

[0046] In an optional implementation, the back plate 4 is made of stainless steel.

[0047] In an optional implementation, the sound-transmitting layer 2 is made of PVF film.

[0048] In an optional embodiment, the back cavity 3 is divided into a plurality of sound-absorbing spaces, and the sound-absorbing spaces are suitable for eliminating noise.

[0049] It should be noted that the back cavity 3 is divided into a number of square sound-absorbing spaces by a grid-shaped partition 5. The partition 5 is formed by a number of plates vertically connected to each other. A number of square sound-absorbing spaces are formed between the plates and between the plates and the back plates. When noise enters the sound-absorbing space, it will cause the air in the sound-absorbing space to vibrate, thereby effectively reducing the transmission of noise.

[0050] It should be noted that if Figure 5 and Figure 6 It can be seen that the present invention effectively reduces the noise of the fan in the low frequency band of 400-1000Hz. According to the test conducted in the impedance tube in the early stage, the sound-permeable membrane made of PVF film (polyvinyl fluoride film) does not affect the sound absorption performance of the sound lining. The test results are as follows: Figure 6Compared with the traditional sound lining design, the installation of PVF film can reduce the airflow loss of the fan without affecting the sound absorption performance, so that the sound lining can be installed in the area where the fan passes to reduce the fan noise. The sound lining was installed in the actual fan area, and the test results are shown as follows Figure 5 and Figure 6 As shown in the figure, after installing the sound lining, there is a noise reduction effect in the main absorption frequency band.

[0051] Example 2

[0052] like Figure 4 As shown, the present invention also provides an air duct, comprising any one of the above-mentioned sound-permeable and airtight lining structures suitable for fan noise reduction, the inner wall of the air duct is provided with a mounting hole, the perforated plate 1 is suitable for being fixed at the mounting hole and suitable for airflow and noise to pass through.

[0053] In this solution, since the sound lining structure is installed on the side wall of the fan channel through the installation hole, it will not increase the running resistance of the fan.

[0054] In an optional implementation, it also includes:

[0055] A fan, suitable for being arranged in the air duct

[0056] It should be noted that the entire sound lining structure is installed on the side wall of the pipeline, including the fan area and the upstream and downstream areas. It should be noted that in order to increase the sound absorbing effect, the number of sound lining structures can be increased, and the more the number, the better the sound absorbing effect.

[0057] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A sound-permeable and airtight lining structure suitable for fan noise reduction, characterized in that: include: A sound-permeable layer (2) adapted to block air flow and allow sound to pass through; A back cavity (3), one side of which is connected to the sound-transmitting layer (2), and both ends of the back cavity (3) have openings; A partition (5) is arranged in the back cavity; A back plate (4) covering an opening of the back cavity (3) on a side away from the sound-transmitting layer (2); The perforated plate (1) is suitable for being connected to one side of the sound-transmitting layer (2); the perforated plate (1) is provided with a plurality of through holes.

2. The sound-permeable and airtight lining structure suitable for fan noise reduction according to claim 1, characterized in that: The perforated plate (1) is arranged on a side of the sound-transmitting layer (2) away from the back cavity (3).

3. The sound-permeable and airtight lining structure suitable for fan noise reduction according to claim 1, characterized in that: The sound-transmitting layer (2) is connected to the perforated plate (1) by bonding.

4. The sound-permeable and airtight lining structure suitable for fan noise reduction according to claim 1, characterized in that: The back cavity (3) is connected to the back plate (4) by bonding.

5. The sound-permeable and airtight lining structure suitable for fan noise reduction according to claim 1, characterized in that: The back cavity (3) is made of stainless steel.

6. The sound-permeable and airtight lining structure suitable for fan noise reduction according to claim 1, characterized in that: The back plate (4) is made of stainless steel.

7. The sound-permeable and airtight lining structure suitable for fan noise reduction according to claim 1, characterized in that: The material of the sound-transmitting layer (2) is PVF film.

8. The sound-permeable and airtight lining structure suitable for fan noise reduction according to claim 1, characterized in that: The back cavity (3) is divided into a plurality of silencing spaces, and the silencing spaces are suitable for eliminating noise.

9. An air duct, characterized in that: It comprises a sound-permeable and airtight lining structure suitable for fan noise reduction as described in any one of claims 1 to 8, wherein the inner wall of the air duct is provided with a mounting hole, and the perforated plate (1) is suitable for being fixed at the mounting hole and suitable for airflow and noise to pass through.

10. The air duct according to claim 9, characterized in that: Also includes: The fan is suitable for being arranged in the air duct.

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