Automobile sound insulation plastic ceiling with porous sound absorption structure

Abstract

The utility model relates to the technical field of automobile parts, in particular to an automobile sound insulation plastic ceiling with a porous sound absorption structure, which comprises an outer protection plate, a plurality of inner protection plates and a plurality of outer protection plates, the outer protection plate is of a plate body structure fitted with the shape of an automobile roof, and the outer protection plate is made of modified polycarbonate materials; a concave groove is formed in the bottom end of the outer protection plate, an upper-layer porous sound absorption plate is arranged in the groove of the outer protection plate, and the bottom end of the upper-layer porous sound absorption plate and the perforated supporting plate are bonded and fixed through an epoxy resin adhesive. According to the automobile sound insulation plastic ceiling with the porous sound absorption structure, the upper-layer porous sound absorption plate and the perforated supporting plate are bonded and fixed through an epoxy resin adhesive, and the perforated supporting plate and the lower-layer porous sound absorption plate are connected in a clamped mode through the protruding blocks; meanwhile, the sound absorption columns upwards penetrate through the upper-layer porous sound absorption plate, the perforated supporting plate and the lower-layer porous sound absorption plate and are fixed to the surface of the supporting frame in an array mode, and the composite connecting structure can effectively resist vehicle vibration.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts technology, specifically to a car soundproof plastic roof with a porous sound-absorbing structure. Background Technology

[0002] In the automotive industry, automotive soundproof plastic headliners are important acoustic and structural components inside vehicles. Their main function is to reduce external noise entering the vehicle and reduce noise generated by the vehicle's own vibrations, thereby improving driving comfort. Currently, common automotive soundproof plastic headliners usually adopt a multi-layer composite structure, with the base material mostly being plastic materials such as polypropylene, which are formed through injection molding or compression molding processes. Some products will have a simple sound-absorbing layer on the surface or inside of the base material.

[0003] Existing automotive soundproof plastic headliners with porous sound-absorbing structures are prone to delamination and detachment during long-term use due to insufficient bonding strength between the porous sound-absorbing structure and the substrate, affected by factors such as vehicle vibration and temperature changes. This leads to a decrease in sound absorption performance. Furthermore, the presence of the porous structure reduces the overall structural strength and rigidity of the headliner to some extent, making it prone to deformation during installation and use, affecting its assembly accuracy with the vehicle body, and potentially generating new sources of vibration and noise. Utility Model Content

[0004] The purpose of this utility model is to provide a car soundproof plastic roof with a porous sound-absorbing structure, in order to solve the problems mentioned in the background art, such as insufficient bonding strength between the porous sound-absorbing structure and the substrate, which easily leads to delamination and detachment during long-term use due to factors such as vehicle vibration and temperature changes, resulting in a decrease in sound absorption performance. In addition, the presence of the porous structure will reduce the overall structural strength and rigidity of the roof to a certain extent, making it prone to deformation during installation and use, affecting its assembly accuracy with the vehicle body, and may even generate new sources of vibration and noise.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a car sound insulation plastic roof with a porous sound-absorbing structure, including an outer protective panel, which is a panel structure that conforms to the shape of the car roof, and the outer protective panel is made of modified polycarbonate material;

[0006] The bottom end of the outer protective plate is provided with a recessed groove, and an upper porous sound-absorbing plate is provided in the groove of the outer protective plate. The bottom end of the upper porous sound-absorbing plate is bonded and fixed to the perforated support plate by epoxy resin adhesive, and the bottom end of the perforated support plate is provided with a protrusion that engages with the lower porous sound-absorbing plate.

[0007] The bottom of the lower porous sound-absorbing panel is provided with a connecting rib, and the connecting rib is penetrated by a sound-absorbing column. The sound-absorbing column penetrates upward through the upper porous sound-absorbing panel, the perforated support plate and the lower porous sound-absorbing panel. The sound-absorbing columns are fixed to the surface of the support frame in an array. The bottom of the support frame is bonded with a decorative inner panel by epoxy resin adhesive, and the decorative inner panel is bonded to the side sealing plate.

[0008] By adopting the above technical solution, the upper porous sound-absorbing panel is fixed by the groove of the outer protective plate, and multiple connection methods such as adhesive bonding, snap-fit ​​connection and sound-absorbing column array fixation are combined to improve the bonding strength of each component.

[0009] Preferably, the upper porous sound-absorbing board and the lower porous sound-absorbing board are arranged in parallel, and both the upper porous sound-absorbing board and the lower porous sound-absorbing board are melamine foam boards.

[0010] The above technical solution uses a double sound-absorbing barrier, with the upper and lower porous sound-absorbing panels arranged in parallel and both being melamine foam boards. This enhances the absorption effect of sound waves of different frequencies and improves noise reduction capabilities.

[0011] Preferably, the surfaces of both the upper and lower porous sound-absorbing panels are coated with a fluorocarbon coating, and the holes in the upper and lower porous sound-absorbing panels are staggered.

[0012] By adopting the above technical solution, the misaligned holes extend the sound wave propagation path, increase sound energy conversion, and further optimize the sound absorption effect.

[0013] Preferably, the perforated support plate is made of glass fiber reinforced polypropylene, and the perforated support plate has through holes through which the sound-absorbing column passes.

[0014] Using the above technical solution, the perforated support plate is made of glass fiber reinforced polypropylene, which not only provides a through channel for the sound-absorbing column, but also enhances the structural strength and avoids deformation from affecting the sound absorption path.

[0015] Preferably, the sound-absorbing column is a column made of polyurethane material, and the diameter of the sound-absorbing column is adapted to the diameter of the through hole on the perforated support plate.

[0016] Using the above technical solution, the sound-absorbing column is a polyurethane foam column with a diameter adapted to the through holes, which can help absorb sound waves, and the array distribution enhances the uniformity and effectiveness of sound absorption.

[0017] Preferably, the connecting ribs have a grid structure, and the material of the connecting ribs is the same as that of the supporting frame, both being plates made of glass fiber reinforced polypropylene.

[0018] By adopting the above technical solution, the mesh-like connecting ribs are made of the same material as the supporting frame, which enhances the overall structural rigidity, disperses stress, and does not hinder the transmission of sound waves, thus ensuring sound absorption performance.

[0019] Preferably, the side sealing plate is adhered around the lower porous sound-absorbing plate, the connecting rib plate, and the side wall of the supporting frame.

[0020] By adopting the above technical solution, the side sealing plates are bonded together to form a closed space, preventing sound waves from leaking from the sides and improving sound absorption stability.

[0021] Compared with the prior art, the beneficial effects of this utility model are: the car soundproof plastic roof with a porous sound-absorbing structure:

[0022] 1. The upper porous sound-absorbing panel and the perforated support panel are bonded and fixed with epoxy resin adhesive. The perforated support panel and the lower porous sound-absorbing panel are connected by protrusions. At the same time, the sound-absorbing columns penetrate upward through the upper porous sound-absorbing panel, the perforated support panel and the lower porous sound-absorbing panel and are fixed to the surface of the support frame in an array. The composite connection structure can effectively resist vehicle vibration and ensure long-term stable sound absorption performance.

[0023] 2. The perforated support plate, together with the grid structure of the connecting ribs, and the support frame together form a three-layer rigid support structure. The grid structure can disperse stress and enhance the overall support capacity. The support frame serves as the basic support structure. The components are integrated into a whole through the array fixing method of sound-absorbing columns, which improves the deformation resistance of the ceiling.

[0024] 3. The staggered arrangement of the holes in the upper and lower porous sound-absorbing panels, combined with the array distribution of the sound-absorbing columns, extends the sound wave propagation path, increases the sound energy conversion efficiency, and improves the sound absorption and noise reduction effect. Furthermore, the side sealing plates are wrapped around and bonded to the side wall of the lower structure and form a closed space with the decorative inner panel to prevent unabsorbed sound waves from leaking out from the side gaps, further ensuring the stability of the sound absorption effect. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall external three-dimensional structure of this utility model;

[0026] Figure 2 This is a schematic diagram of the overall disassembled three-dimensional structure of this utility model;

[0027] Figure 3 This is a three-dimensional structural diagram showing the installation positions of the upper and lower porous sound-absorbing panels of this utility model.

[0028] Figure 4 This is a schematic diagram of the overall stepped cross-sectional three-dimensional structure of this utility model;

[0029] Figure 5 This is a schematic diagram of the overall internal three-dimensional structure of this utility model;

[0030] Figure 6This is a schematic diagram of the overall internal side section of the present invention.

[0031] In the diagram: 1. Outer protective panel; 2. Upper porous sound-absorbing panel; 3. Perforated support panel; 4. Lower porous sound-absorbing panel; 5. Connecting ribs; 6. Sound-absorbing column; 7. Support frame; 8. Decorative inner panel; 9. Side sealing panel. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] Please see Figures 1-6 This utility model provides a technical solution: a car sound insulation plastic roof with a porous sound-absorbing structure, including an outer protective plate 1, an upper porous sound-absorbing plate 2, a perforated support plate 3, a lower porous sound-absorbing plate 4, a connecting rib plate 5, a sound-absorbing column 6, a support frame 7, a decorative inner plate 8, and a side sealing plate 9.

[0034] Among them, the outer protective plate 1 is a plate structure that fits the shape of the car roof, and the outer protective plate 1 is made of modified polycarbonate material;

[0035] The bottom of the outer protective plate 1 is provided with a recessed groove, and an upper porous sound-absorbing plate 2 is provided in the groove of the outer protective plate 1. The upper porous sound-absorbing plate 2 and the lower porous sound-absorbing plate 4 are arranged in parallel, and both the upper porous sound-absorbing plate 2 and the lower porous sound-absorbing plate 4 are melamine foam boards. The surfaces of the upper porous sound-absorbing plate 2 and the lower porous sound-absorbing plate 4 are coated with fluorocarbon coating, and the holes of the upper porous sound-absorbing plate 2 and the lower porous sound-absorbing plate 4 are staggered. The bottom of the upper porous sound-absorbing plate 2 is bonded and fixed to the perforated support plate 3 with epoxy resin adhesive, and the bottom of the perforated support plate 3 is provided with a protrusion that engages with the lower porous sound-absorbing plate 4. The perforated support plate 3 is made of glass fiber reinforced polypropylene, and a through hole is opened in the perforated support plate 3 through which the sound-absorbing column 6 passes.

[0036] Referring to the attached diagrams in the instruction manual Figures 1-6As shown, the outer protective plate 1 is first positioned according to the shape of the car roof. It is made of modified polycarbonate material. The recessed groove at the bottom provides a basic space for the installation of subsequent components. The upper porous sound-absorbing plate 2 is placed in the groove of the outer protective plate 1 to ensure that the position is stable. Then, epoxy resin adhesive is applied to the bottom of the upper porous sound-absorbing plate 2, and the perforated support plate 3 is bonded and fixed to it to ensure that the two are tightly connected. Then, the protrusion at the bottom of the perforated support plate 3 is used to engage with the lower porous sound-absorbing plate 4 to achieve a stable assembly of the two.

[0037] When sound waves generated by external noise or vibration inside the vehicle are transmitted to the roof, the sound waves first come into contact with the outermost protective panel 1. The panel structure that fits the car roof provides initial obstruction for the sound waves. The sound waves that pass through the outer protective panel 1 enter the upper porous sound-absorbing panel 2. Since the holes of the upper porous sound-absorbing panel 2 and the lower porous sound-absorbing panel 4 are misaligned, the sound waves cannot pass directly through the holes of the lower sound-absorbing panel. They can only propagate further through the area of ​​the perforated support panel 3 between the two layers. The through holes in the perforated support panel 3 allow the sound-absorbing columns 6 to pass through. The sound waves are reflected again in the space formed by the perforated support panel 3 and the upper and lower sound-absorbing panels, which prolongs the propagation path, increases the contact time with the sound-absorbing material, and improves the sound absorption effect.

[0038] The bottom of the lower porous sound-absorbing panel 4 is provided with connecting ribs 5, and the connecting ribs 5 are penetrated by sound-absorbing columns 6. The sound-absorbing columns 6 penetrate upward through the upper porous sound-absorbing panel 2, the perforated support plate 3 and the lower porous sound-absorbing panel 4. The sound-absorbing columns 6 are fixed to the surface of the support frame 7 in an array. The bottom of the support frame 7 is bonded with a decorative inner panel 8 by epoxy resin adhesive. The decorative inner panel 8 is bonded to the side sealing plate 9. The sound-absorbing columns 6 are made of polyurethane material and the diameter of the sound-absorbing columns 6 is matched with the diameter of the through holes on the perforated support plate 3. The connecting ribs 5 have a grid structure and the material of the connecting ribs 5 is the same as that of the support frame 7, which are both made of glass fiber reinforced polypropylene. The side sealing plate 9 is bonded around the lower porous sound-absorbing panel 4, the connecting ribs 5 and the side wall of the support frame 7. The side sealing plate 9 adopts the same pattern as the decorative inner panel 8.

[0039] Referring to the attached diagrams in the instruction manual Figures 1-6 As shown, a connecting rib 5 is laid at the bottom of the lower porous sound-absorbing panel 4, and the sound-absorbing column 6 is passed through the connecting rib 5, the lower porous sound-absorbing panel 4, the perforated support plate 3 and the upper porous sound-absorbing panel 2 in sequence. Then, the sound-absorbing column 6 is fixed to the surface of the support frame 7 in an array. Epoxy resin adhesive is applied to the bottom of the support frame 7, and the decorative inner panel 8 is glued and fixed on it. Finally, the side sealing plate 9 is wrapped around and glued to the side wall of the lower porous sound-absorbing panel 4, the connecting rib 5 and the support frame 7, and glued to the decorative inner panel 8 to complete the installation of the entire ceiling.

[0040] When the sound wave passes through the perforated support plate 3, it continues to be transmitted to the lower porous sound-absorbing plate 4, which forms a double sound-absorbing barrier with the upper sound-absorbing plate. The porous structure further attenuates the sound wave. At the same time, the sound-absorbing column 6 that runs through each layer plays an auxiliary sound-absorbing role. The sound wave is reflected and rubbed multiple times in its pores, further converting the sound energy. Since the connecting rib plate 5 is penetrated by the sound-absorbing column 6, its grid structure enhances the overall structural rigidity and does not hinder the transmission of sound waves to the sound-absorbing column 6.

[0041] The support frame 7 provides stable support for each sound-absorbing component through the array of sound-absorbing columns 6, avoiding structural deformation from affecting the sound absorption path. The bottom decorative inner panel 8 and the side sealing panel 9 form a closed space to prevent unabsorbed sound waves from leaking from the side gaps, while also improving the aesthetics of the vehicle interior. The whole process achieves a significant noise reduction effect and increases overall practicality.

[0042] Working principle: When using this car sound insulation plastic roof with a porous sound-absorbing structure, when sound waves generated by external noise or vibration inside the car are transmitted to the roof, they first come into contact with the outermost protective panel 1. Because its panel structure fits the car roof, it can initially block the sound waves, reducing some of the noise from directly penetrating. After the sound waves pass through the outer protective panel 1, they enter the upper porous sound-absorbing panel 2. Since the holes of the upper porous sound-absorbing panel 2 and the lower porous sound-absorbing panel 4 are staggered, the sound waves cannot directly pass through the holes of the lower sound-absorbing panel after passing through the upper sound-absorbing panel. They need to propagate further in the area of ​​the perforated support plate 3 between the two layers.

[0043] The through holes in the perforated support plate 3 allow the sound-absorbing column 6 to pass through, while also providing a transmission channel for sound waves. The sound waves are reflected again in the space formed by the perforated support plate 3 and the upper and lower sound-absorbing plates, which prolongs the propagation path and increases the contact time with the sound-absorbing material, further improving the sound absorption effect. The lower porous sound-absorbing plate 4 and the upper sound-absorbing plate form a double sound-absorbing barrier, and its porous structure continues to attenuate the sound waves. At the same time, the sound-absorbing column 6 that passes through the upper porous sound-absorbing plate 2, the perforated support plate 3 and the lower porous sound-absorbing plate 4 plays an auxiliary sound absorption role.

[0044] The sound-absorbing column 6 is fixed to the surface of the support frame 7 in an array. The sound waves are reflected and rubbed multiple times in the pores of the sound-absorbing column 6, further converting into sound energy. The connecting rib 5 is penetrated by the sound-absorbing column 6. Its grid structure is made of glass fiber reinforced polypropylene, which is the same material as the support frame 7. This can enhance the overall structural rigidity without hindering the transmission of sound waves to the sound-absorbing column 6.

[0045] The support frame 7 serves as the structural foundation of the entire roof. Through the array of sound-absorbing columns 6, it provides stable support for each sound-absorbing component, preventing structural deformation from affecting the sound absorption path. The inner decorative panel 8 at the bottom layer is bonded to the support frame 7 with epoxy resin adhesive. The side sealing panel 9 is bonded around the side wall of the lower structure, forming a closed space with the inner decorative panel 8 to prevent unabsorbed sound waves from leaking from the side gaps. At the same time, it enhances the aesthetics of the interior and increases the overall practicality.

[0046] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A car soundproof plastic headliner with a porous sound-absorbing structure, comprising: The outer protective panel (1) is a panel structure that fits the shape of the car roof. The outer protective panel (1) is made of modified polycarbonate material. The feature is that: the bottom end of the outer protective plate (1) is provided with a recessed groove, and an upper porous sound-absorbing plate (2) is provided in the groove of the outer protective plate (1). The bottom end of the upper porous sound-absorbing plate (2) is bonded and fixed to the perforated support plate (3) by epoxy resin adhesive, and the bottom end of the perforated support plate (3) is provided with a protrusion that engages with the lower porous sound-absorbing plate (4). The bottom end of the lower porous sound-absorbing plate (4) is provided with a connecting rib (5), and the connecting rib (5) is penetrated by the sound-absorbing column (6). The sound-absorbing column (6) penetrates upward through the upper porous sound-absorbing plate (2), the perforated support plate (3) and the lower porous sound-absorbing plate (4). The sound-absorbing column (6) is fixed on the surface of the support frame (7) in an array. The bottom end of the support frame (7) is bonded with a decorative inner panel (8) by epoxy resin adhesive. The decorative inner panel (8) is bonded to the side sealing plate (9).

2. The automotive soundproof plastic roof with a porous sound-absorbing structure according to claim 1, characterized in that: The upper porous sound-absorbing board (2) and the lower porous sound-absorbing board (4) are arranged in parallel, and both the upper porous sound-absorbing board (2) and the lower porous sound-absorbing board (4) are melamine foam boards.

3. The automotive soundproof plastic roof with a porous sound-absorbing structure according to claim 1, characterized in that: The surfaces of the upper porous sound-absorbing plate (2) and the lower porous sound-absorbing plate (4) are coated with fluorocarbon coating, and the holes of the upper porous sound-absorbing plate (2) and the lower porous sound-absorbing plate (4) are staggered.

4. The automotive soundproof plastic roof with a porous sound-absorbing structure according to claim 1, characterized in that: The perforated support plate (3) is made of glass fiber reinforced polypropylene, and the perforated support plate (3) has through holes through which the sound-absorbing column (6) passes.

5. The automotive soundproof plastic roof with a porous sound-absorbing structure according to claim 1, characterized in that: The sound-absorbing column (6) is a column made of polyurethane material, and the diameter of the sound-absorbing column (6) is matched with the diameter of the through hole on the perforated support plate (3).

6. The automotive soundproof plastic roof with a porous sound-absorbing structure according to claim 1, characterized in that: The connecting rib (5) has a grid structure, and the material of the connecting rib (5) is the same as that of the supporting frame (7), both being plates made of glass fiber reinforced polypropylene.

7. The automotive soundproof plastic roof with a porous sound-absorbing structure according to claim 1, characterized in that: The side sealing plate (9) is attached around the lower porous sound-absorbing plate (4), the connecting rib plate (5) and the side wall of the support frame (7).

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