Acoustic liner installation method and structure

Abstract

The sound lining installation method installs the sound lining into the installation interface which has an inner cavity matched with the shape of the sound lining. The installation steps include: S1, welding a front pressing strip along the front edge of the inner cavity; S2, inserting the sound lining into the inner cavity from the back of the inner cavity until the edge of the sound lining abuts against the front pressing strip; S3, welding a back pressing strip along the back edge of the inner cavity, the back pressing strip abuts against the edge of the sound lining, the inner cavity wall, the front pressing strip, the back pressing strip and the side wall of the sound lining enclose a glue injection gap, damping glue is injected into the glue injection gap, and the damping glue is solidified to form a damping glue layer. The present application avoids the formation of installation part falling and secondary noise, and has higher safety and reliability of sound lining installation, ensures the positioning reliability of the sound lining on the installation interface, forms a stepless installation structure of the sound lining on the installation interface, and improves the appearance quality of the sound lining installation. The present application also provides a sound lining installation structure.

Description

Technical Field

[0001] This invention relates to a method and structure for installing acoustic liners, belonging to the field of acoustic liner installation technology. Background Technology

[0002] Noise issues are often required in fields such as large wind tunnel engineering flow guidance facilities, large high-speed compressor inlet and outlet channels, aircraft engines, or rail transit tunnel engineering. Sound liners are increasingly being installed on structural surfaces, or sound liners that form an integrated structure with the installation interface, in order to achieve noise control in both flow-generating and non-flow-generating scenarios.

[0003] Currently, the common installation and connection methods for acoustic liners are screw fastening or riveting, which allows for installation on the structural surface or integration with the noise reduction installation interface. However, in high sound pressure level noise scenarios, especially in high-speed flow environments, under complex acoustic and vibrational conditions caused by temperature fluctuations, uneven sound pressure, and airflow pulsation, screws or rivets are subject to long-term tension, compression, vibration, and friction with the screw or rivet holes. This can easily lead to breakage, loosening, or falling off, posing a significant hazard to the entire system. For example, if the acoustic liner connecting screws or rivets on the acoustic guide vanes of a large wind tunnel project fall off, the high-speed airflow could potentially damage the downstream main compressor and blades, test models, or other test facilities worth millions or even tens of millions of dollars. If screws or riveting are used for fastening, two disadvantages exist: First, without countersunk screws, the screws or rivets will protrude, directly affecting the flatness and appearance of the structure. More seriously, in airflow scenarios, the screw or rivet heads are prone to generating secondary noise. Second, if countersunk screws are used, the structure to accommodate the screws or rivets needs a certain thickness, thus increasing manufacturing and installation costs. Furthermore, taking riveting as an example, if the material is inconsistent with the substrate of the mounting interface, electrochemical corrosion is likely to occur in high-temperature environments, potentially leading to connection failure and corrosion of the mounting interface, causing equipment hazards or increased maintenance costs. Summary of the Invention

[0004] The acoustic liner installation method provided by this invention, through the positioning of the front and back pressure strips and the flexible bonding of the vibration-damping adhesive layer, ensures high structural stability of the acoustic liner installation, preventing the detachment of installed parts and secondary noise. This enhances the safety and reliability of the acoustic liner installation. The acoustic liner is positioned within the cavity by the cooperation of the front and back pressure strips with the concave corner edge, ensuring reliable positioning of the acoustic liner on the installation interface and forming a stepless installation structure, thus improving the appearance quality of the acoustic liner installation. This invention also provides an acoustic liner installation structure.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A method for installing an acoustic liner, wherein the acoustic liner is inserted into an installation interface having an inner cavity that matches the shape of the acoustic liner, characterized in that the installation steps include:

[0007] S1: Weld the front pressure strip along the front edge of the inner cavity;

[0008] S2: Insert the sound liner into the inner cavity from the back until the edge of the sound liner abuts against the front pressure strip;

[0009] S3: Weld a back pressure strip along the back edge of the inner cavity. The back pressure strip abuts against the edge of the sound liner. The inner cavity wall, the front pressure strip, the back pressure strip and the side wall of the sound liner together form an injection gap. Inject damping glue into the injection gap and wait for the damping glue to cure to form a vibration damping glue layer.

[0010] Preferably, in step S1, the front pressure strip is welded along the left, right and bottom edges of the front of the inner cavity, and the top surface of the sound liner does not contact the top wall of the inner cavity.

[0011] Preferably, the acoustic liner sidewall that surrounds the glue injection gap is an inwardly recessed groove-shaped sidewall.

[0012] Preferably, the edges of the acoustic liner that contact the front and back pressure strips are designed as concave right-angled edges, with the front and back pressure strips extending into the concave right-angled edges. The front pressure strip is flush with the front of the acoustic liner, and the back pressure strip is flush with the back of the acoustic liner.

[0013] Preferably, a polytetrafluoroethylene (PTFE) gasket is laid on the bottom wall of the inner cavity. When the acoustic liner is inserted into the inner cavity, the surface of the acoustic liner contacts the PTFE gasket. The number of PTFE gaskets is at least two, and adjacent PTFE gaskets are spaced apart.

[0014] Preferably, step S3 specifically refers to:

[0015] First, weld back pressure strips to the left, right, and bottom edges of the inner cavity; then, inject damping adhesive into the cavity gap through the gap between the sound liner and the back pressure strip; after the damping adhesive has cured to form a vibration damping adhesive layer, weld back pressure strips to the upper edge of the inner cavity.

[0016] Preferably, a back pressure strip is first welded to the bottom edge of the back of the inner cavity, and plastic stickers or elastic strips are pasted on the left and right edges of the back of the inner cavity to replace the back pressure strip. After the damping adhesive cures to form a vibration damping layer, the plastic stickers or elastic strips are removed, and back pressure strips are welded to the upper edge, left and right edges of the back of the inner cavity.

[0017] Preferably, both the back pressure strip and the front pressure strip have plug welding through holes, and the back pressure strip and the front pressure strip are welded to the mounting interface by plug welding process.

[0018] The acoustic liner installation structure formed by the above-described acoustic liner installation method includes an installation interface and an acoustic liner. The installation interface has an inner cavity corresponding to the acoustic liner, and the acoustic liner is placed in the inner cavity. The structure is characterized in that: a front pressure strip is fixed to the front edge of the inner cavity, and a back pressure strip is fixed to the back edge. The acoustic liner is positioned in the inner cavity by the front pressure strip and the back pressure strip. A vibration damping adhesive layer is bonded between the side wall of the acoustic liner and the cavity wall.

[0019] Preferably, the front side of the acoustic liner is flush with the front pressure strip, and the back side of the acoustic liner is flush with the back pressure strip, forming a stepless installation structure for the acoustic liner on the installation interface.

[0020] The beneficial effects of the invention are:

[0021] The acoustic liner installation method of the present invention matches the shape of the acoustic liner with the inner cavity of the installation interface. First, a front pressure strip is welded along the front edge of the inner cavity. Then, the acoustic liner is inserted into the inner cavity, and the acoustic liner is limited by the abutment between the front pressure strip and the acoustic liner. Then, a back pressure strip is welded along the back edge of the inner cavity, and the back pressure strip abuts against the edge of the acoustic liner, so that the acoustic liner is positioned in the inner cavity. The acoustic liner is not directly rigidly fixed to the installation interface, but is positioned by the front and back pressure strips, and both the front and back pressure strips are firmly and reliably welded to the installation interface. The inner cavity wall, the front pressure strip, the back pressure strip, and the side wall of the acoustic liner together form a... The adhesive injection gaps and the formation of a damping adhesive layer within them not only fill the gaps between the acoustic liner and the installation interface, but also flexibly bond the acoustic liner to the installation interface through the damping adhesive layer. The positioning of the front and back pressure strips, combined with the flexible bonding of the damping adhesive layer, ensures high structural stability of the acoustic liner installation, preventing the detachment of installed parts and secondary noise. This enhances the safety and reliability of the acoustic liner installation. The damping adhesive layer reduces the vibration of the acoustic liner in the installation interface and reduces the force exerted by the acoustic liner on the front and back pressure strips, flexibly connecting and positioning the acoustic liner in the installation interface, thereby improving the stability and reliability of the acoustic liner installation.

[0022] The acoustic liner is positioned in the inner cavity by the cooperation of the front and back pressure strips with the concave corner edge, ensuring the reliability of the acoustic liner's positioning on the installation interface. The pressure strip is flush with the front of the acoustic liner, and the back pressure strip is flush with the back of the acoustic liner, so that the pressure strip and the acoustic liner form a stepless fit, forming a stepless installation structure of the acoustic liner on the installation interface, improving the appearance quality of the acoustic liner installation. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the acoustic liner mounting structure of the present invention.

[0024] Figure 2 A schematic diagram of the installation interface for laying polytetrafluoroethylene gaskets in the inner cavity.

[0025] Figure 3 This is a schematic diagram showing the front pressure strip welded to the front edge of the inner cavity.

[0026] Figure 4 for Figure 1 A cross-sectional view.

[0027] Figure 5 This is a cross-sectional view of the sound liner. Detailed Implementation

[0028] The following is combined Figures 1-5 The embodiments of the present invention will be described in detail below.

[0029] A method for installing a sound liner, wherein the sound liner 1 is inserted into an installation interface 2, the installation interface 2 having an inner cavity 3 that matches the shape of the sound liner, characterized in that the installation steps include:

[0030] S1: Weld the front pressure strip 4 along the front edge of the inner cavity 3;

[0031] S2: Insert the sound liner 1 into the inner cavity 3 from the back of the inner cavity until the edge of the sound liner abuts against the front pressure strip 4;

[0032] S3: Weld back pressure strip 5 along the back edge of inner cavity 2. Back pressure strip 5 fits with the edge of sound liner 1. The inner cavity wall, front pressure strip 4, back pressure strip 5 and the side wall of sound liner 1 form a glue injection gap 6. Inject damping glue into the glue injection gap 6 and wait for the damping glue to cure to form a vibration damping glue layer 7.

[0033] The acoustic liner installation method described above involves matching the shape of the acoustic liner 1 to the inner cavity 3 of the installation interface 2. First, a front pressure strip 4 is welded along the front edge of the inner cavity 3. Then, the acoustic liner 1 is inserted into the inner cavity 3, and the front pressure strip 4 abuts against the acoustic liner 1 to limit its position. Next, a back pressure strip 5 is welded along the back edge of the inner cavity 3. The back pressure strip 5 fits snugly against the edge of the acoustic liner 1, positioning the acoustic liner 1 within the inner cavity 3. The acoustic liner 1 is not directly rigidly fixed to the installation interface, but rather positioned by the front and back pressure strips, both of which are securely welded to the installation interface. The acoustic liner 1 is fixed to the inner cavity wall, the front pressure strip, and the back pressure strip. The strips and the sidewalls of the acoustic liner enclose the injection gap, forming a vibration-damping adhesive layer within the gap. This not only fills the gap between the acoustic liner and the installation interface but also flexibly bonds the acoustic liner to the installation interface through the vibration-damping adhesive layer. The positioning of the front and back pressure strips, combined with the flexible bonding of the vibration-damping adhesive layer, ensures high structural stability of the acoustic liner installation, preventing the detachment of installed parts and secondary noise. This enhances the safety and reliability of the acoustic liner installation. The vibration-damping adhesive layer reduces the vibration of the acoustic liner in the installation interface and reduces the force exerted by the acoustic liner on the front and back pressure strips, flexibly connecting and positioning the acoustic liner in the installation interface, thus improving the stability and reliability of the acoustic liner installation.

[0034] In step S1, a front pressure strip 4 is welded along the left, right, and bottom edges of the inner cavity 3. The top surface of the acoustic liner 1 does not contact the top wall of the inner cavity 3. The front pressure strip 4 welded to the front edge of the inner cavity 3 limits the inner cavity 3 when the acoustic liner 1 is inserted into the inner cavity 3. After the acoustic liner 1 is inserted into the inner cavity 3, the front pressure strip 4, the acoustic liner 1, the back pressure strip 5, and the inner cavity wall together form an injection gap 6 so that a vibration damping adhesive layer 7 can be formed after the adhesive is injected.

[0035] The acoustic liner sidewall that encloses the injection gap 6 is an inwardly recessed groove-shaped sidewall 10. The groove-shaped sidewall 10, together with the front pressure strip 4, the back pressure strip 5, and the inner cavity wall, encloses the injection gap 6. The groove-shaped sidewall can increase the thickness of the injection gap 6, thereby increasing the thickness of the damping adhesive layer 7 formed after injection, ensuring the damping reliability of the damping adhesive layer 7. The recessed depth of the groove-shaped sidewall 10 can be adjusted according to the damping requirements of the acoustic liner 1 under its operating conditions to adjust the thickness of the damping adhesive layer 7 and ensure the damping effect.

[0036] The edges where the acoustic liner 1 contacts the front pressure strip 4 and the back pressure strip 5 are designed as concave right-angled edges 8. The front pressure strip 4 and the back pressure strip 5 extend into the concave right-angled edges 8. The front pressure strip 4 is flush with the front of the acoustic liner 1, and the back pressure strip 5 is flush with the back of the acoustic liner. The front pressure strip 4 abuts against the front edge of the acoustic liner 1, and the back pressure strip 5 abuts against the back edge of the acoustic liner 1. The abutting edges are concave right-angled edges 8. The acoustic liner 1 is positioned in the inner cavity through the cooperation of the front pressure strip 4 and the back pressure strip 5 with the concave right-angled edges 8, ensuring the reliable positioning of the acoustic liner 1 in the mounting interface 2. The pressure strip 4 is flush with the front of the acoustic liner 1, and the back pressure strip 5 is flush with the back of the acoustic liner, so that the pressure strip and the acoustic liner form a stepless fit, forming a stepless installation structure for the acoustic liner on the mounting interface.

[0037] In this design, a polytetrafluoroethylene (PTFE) gasket 9 is laid on the bottom wall of the inner cavity 3. When the acoustic liner 1 is inserted into the inner cavity 3, the bottom surface of the acoustic liner 1 contacts the PTFE gasket 9. There are at least two PTFE gaskets 9, and adjacent PTFE gaskets 9 are spaced apart. The PTFE gaskets 9 physically separate the bottom wall of the inner cavity 3 from the bottom surface of the acoustic liner 1, preventing electrochemical corrosion of the metal installation interface under high temperature conditions from affecting the acoustic liner 1. When the adhesive is injected to form the damping layer 7, the adhesive will flow between adjacent PTFE gaskets 9, so that a damping layer 7 will also be formed between the bottom surface of the acoustic liner and the bottom wall of the inner cavity. Moreover, the PTFE gaskets 9 have self-lubricating properties, which can reduce the friction between the acoustic liner 1 and the inner cavity 3 when the acoustic liner 1 is removed from the inner cavity 3.

[0038] Specifically, step S3 refers to:

[0039] First, weld back pressure strips 5 to the left, right, and bottom edges of the back of the inner cavity 3. Then, inject damping adhesive into the injection cavity 6 through the gap between the acoustic liner 1 and the back pressure strips 5. After the damping adhesive cures to form a vibration damping layer 7, weld back pressure strips 5 to the upper edge of the back of the inner cavity 3. Welding the back pressure strips 5 to the upper edge of the back of the inner cavity 3 after the vibration damping layer 7 is done is to leave an injection gap in the injection cavity 6, so that the damping adhesive can be injected into the injection cavity 6 from top to bottom. When adhesive overflows from the reserved injection position, it means that the injection cavity 6 has been filled.

[0040] First, a back pressure strip 5 is welded to the bottom edge of the back of the inner cavity 3. Plastic stickers or elastic strips are then pasted onto the left and right edges of the back of the inner cavity 3 to replace the back pressure strip 5. After the damping adhesive cures to form a vibration-damping layer, the plastic stickers or elastic strips are removed. Back pressure strips are then welded to the upper, left, and right edges of the back of the inner cavity. Because the plastic stickers or elastic strips are easy to cut and adhere, the injection position can be temporarily changed, allowing for greater freedom in on-site injection. After the adhesive is injected and air-dried to form a vibration-damping layer 7, the plastic stickers or elastic strips are removed. Back pressure strips 5 are then welded to the upper, left, and right edges of the back of the inner cavity, forming a stepless mounting structure between the sound liner 1 and the installation interface 2.

[0041] Both the back pressure strip 5 and the front pressure strip 4 have plug-weld through holes, and are welded to the mounting interface 2 using a plug-welding process. The back pressure strip 5, the front pressure strip 4, and the mounting interface 2 are all made of metal, resulting in high welding strength and a secure bond. After welding, the surface is ground smooth, resulting in a high-quality appearance. Compared to riveted or bolted connections, this method is more robust, preventing loosening or detachment and avoiding secondary noise.

[0042] This invention also protects an acoustic liner installation structure formed by the above-described acoustic liner installation method, comprising an installation interface 2 and an acoustic liner 1. The installation interface 2 has an inner cavity 3 corresponding to the acoustic liner 1, and the acoustic liner 1 is placed in the inner cavity 3. The invention is characterized in that: a front pressure strip 4 is fixed to the front edge of the inner cavity 3, and a back pressure strip 5 is fixed to the back edge. The acoustic liner is positioned in the inner cavity 3 by the front pressure strip 4 and the back pressure strip 5. A vibration damping adhesive layer 7 is bonded between the side wall of the acoustic liner 1 and the cavity wall of the inner cavity 3.

[0043] In the above-described acoustic liner installation structure, the vibration damping adhesive layer 7 flexibly bonds the acoustic liner to the installation interface. The positioning of the front and back pressure strips, combined with the flexible bonding of the vibration damping adhesive layer 7, makes the acoustic liner 1 installation structure highly stable, avoiding the detachment of installation parts and secondary noise. The safety and reliability of the acoustic liner installation are higher. The vibration damping adhesive layer 7 can not only fill the gap between the acoustic liner and the installation interface, but also reduce the vibration of the acoustic liner at the installation interface and reduce the force of the acoustic liner on the front and back pressure strips. It flexibly connects and positions the acoustic liner in the installation interface, improving the stability and reliability of the acoustic liner installation.

[0044] In this design, the front side of the acoustic liner 1 is flush with the front pressure strip 4, and the back side of the acoustic liner 1 is flush with the back pressure strip 5, forming a stepless installation structure for the acoustic liner 1 on the installation interface 2. This stepless installation structure improves the appearance quality of the acoustic liner installation.

[0045] The technical solutions of the embodiments of the present invention have been fully described above with reference to the accompanying drawings. It should be noted that the described embodiments are only a part of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

Claims

1. A method for installing a sound liner, comprising inserting the sound liner into an installation interface having an inner cavity that matches the shape of the sound liner, characterized in that, The installation steps include: S1: Weld the front pressure strip along the front edge of the inner cavity; S2: Insert the sound liner into the inner cavity from the back until the edge of the sound liner abuts against the front pressure strip; S3: Weld a back pressure strip along the back edge of the inner cavity. The back pressure strip abuts against the edge of the sound liner. The inner cavity wall, the front pressure strip, the back pressure strip and the side wall of the sound liner together form an injection gap. Inject damping glue into the injection gap and wait for the damping glue to cure to form a vibration damping glue layer. In step S1, the front pressure strip is welded along the left, right and bottom edges of the front of the inner cavity, and the top surface of the sound liner does not contact the top wall of the inner cavity. The acoustic liner sidewall that surrounds and forms the glue injection gap is a recessed groove-shaped sidewall. The edges where the acoustic liner contacts the front and back pressure strips are designed as concave right-angled edges. The front and back pressure strips extend into the concave right-angled edges. The front pressure strip is flush with the front of the acoustic liner, and the back pressure strip is flush with the back of the acoustic liner.

2. The acoustic liner installation method according to claim 1, characterized in that: A polytetrafluoroethylene (PTFE) gasket is laid on the bottom wall of the inner cavity. When the acoustic liner is inserted into the inner cavity, the surface of the acoustic liner contacts the PTFE gasket. There are at least two PTFE gaskets, and adjacent PTFE gaskets are spaced apart.

3. The acoustic liner installation method according to claim 1, characterized in that, Step S3 specifically refers to: First, weld back pressure strips to the left, right, and bottom edges of the inner cavity; then, inject damping adhesive into the cavity gap through the gap between the sound liner and the back pressure strip; after the damping adhesive has cured to form a vibration damping adhesive layer, weld back pressure strips to the upper edge of the inner cavity.

4. The acoustic liner installation method according to claim 3, characterized in that: First, weld a back pressure strip to the bottom edge of the back of the inner cavity, and then attach plastic stickers or elastic strips to the left and right edges of the back of the inner cavity to replace the back pressure strip. After the damping adhesive has cured to form a vibration damping layer, remove the plastic stickers or elastic strips, and then weld back pressure strips to the top, left, and right edges of the back of the inner cavity.

5. The acoustic liner installation method according to claim 1, characterized in that: Both the back pressure strip and the front pressure strip have plug welding through holes, and the back pressure strip and the front pressure strip are welded to the mounting interface by plug welding process.

6. A sound liner mounting structure formed by the sound liner mounting method according to any one of claims 1 to 5, comprising a mounting interface and a sound liner, wherein the mounting interface has an inner cavity corresponding to the sound liner, and the sound liner is placed in the inner cavity, characterized in that: A front pressure strip is fixed to the front edge of the inner cavity, and a back pressure strip is fixed to the back edge. The acoustic liner is positioned in the inner cavity by the front and back pressure strips, and a vibration damping adhesive layer is bonded between the side wall of the acoustic liner and the cavity wall.

7. The acoustic liner mounting structure according to claim 6, characterized in that: The front of the acoustic liner is flush with the front pressure strip, and the back of the acoustic liner is flush with the back pressure strip, forming a stepless installation structure for the acoustic liner on the installation interface.

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