A passenger car air conditioner noise reduction structure, air conditioner mounting structure and passenger car
By using composite noise reduction materials and targeted noise reduction structures at the air vents in the bus air conditioning system, the problems of poor noise reduction effect and insufficient stability of traditional foaming processes have been solved, achieving efficient and long-lasting noise reduction and improving ride comfort and cabin quietness.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- ZHONGTONG BUS HLDG
- Filing Date
- 2026-03-16
- Publication Date
- 2026-06-16
AI Technical Summary
Existing bus air conditioning foaming processes have limited noise reduction effects, and the materials are prone to aging and falling off, making it impossible to stably reduce vibration and aerodynamic noise in the long term, thus affecting passenger comfort and health.
Composite noise reduction materials, including a damping layer, a sound-absorbing layer, a sound-insulating layer, and a protective layer, are used and layered between the air conditioning unit and the unit mounting frame. Sound-absorbing structures are also installed at the air outlet and return air outlet to achieve a synergistic effect of damping vibration reduction and sound absorption noise reduction.
It significantly improves the noise reduction effect of air conditioning, with an overall noise reduction of more than 30%, stability improved by 2-3 times, ride comfort significantly improved, construction efficiency increased by 50%, and costs controllable.
Smart Images
Figure CN122211136A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of noise reduction technology for bus air conditioning, and in particular to a noise reduction structure for bus air conditioning, an air conditioning installation structure, and a bus. Background Technology
[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.
[0003] As the core equipment for regulating the temperature inside a bus, the air conditioner generates significant vibration and aerodynamic noise during operation, which directly affects the comfort of passengers and reduces the travel experience. At the same time, long-term exposure to noise can also have potential health effects. Therefore, sound insulation and noise reduction for bus air conditioners has become a key aspect of enhancing the competitiveness of bus products.
[0004] Currently, the industry generally uses foaming technology to reduce noise in the air conditioning area of buses. However, this technology has obvious disadvantages: the damping performance and sound absorption effect of foamed materials are limited, making it difficult to effectively block the structural vibration noise and aerodynamic noise generated during the operation of the air conditioning. Moreover, after the foamed materials are formed, problems such as uneven pores and weak bonding are likely to occur. After long-term use, they are prone to aging and falling off, resulting in a continuous decline in the noise reduction effect, which cannot meet the long-term stable noise reduction requirements. Summary of the Invention
[0005] To address the aforementioned problems, this invention proposes a noise reduction structure for a bus air conditioner, an air conditioner installation structure, and a bus, which improves the noise reduction efficiency of the air conditioner and is durable and easy to install.
[0006] To achieve the above objectives, the present invention adopts the following technical solution: Firstly, a noise reduction structure for bus air conditioning is proposed, including: an air conditioning unit, a unit mounting base, an outlet air fixing bracket, and a return air inlet fixing bracket; the air conditioning unit is fixed on the unit mounting base, the air conditioning outlet air is fixed on the outlet air fixing bracket, and the air conditioning return air inlet is fixed on the return air inlet fixing bracket. Composite noise reduction material is installed between the air conditioning unit and the unit mounting frame; an air outlet sound absorption structure is installed between the air conditioning outlet and the outlet mounting bracket; and a return air sound absorption structure is installed between the air conditioning return air outlet and the return air mounting bracket. The composite noise reduction material includes a damping layer, a sound-absorbing layer, a sound-insulating layer, and a protective layer stacked sequentially.
[0007] Furthermore, the damping layer is located on the side of the air conditioning unit, and the protective layer is located on the side of the unit mounting frame.
[0008] Furthermore, the damping layer in the composite noise reduction material uses butyl rubber damping material; the sound absorption layer in the composite noise reduction material uses felt sound-absorbing cotton; the sound insulation layer in the composite noise reduction material uses EVA material; and the protective layer in the composite noise reduction material uses PE material.
[0009] Furthermore, the composite noise reduction material has a damping layer thickness of 2±0.3mm, a sound-absorbing layer thickness of 30±1mm, a sound-insulating layer thickness of 2±0.3mm, and a protective layer thickness of 3±0.3mm.
[0010] Furthermore, both the exhaust and return air sound absorption structures use sound-absorbing layers made of corrugated sound-absorbing cotton.
[0011] Furthermore, the damping layer, sound-absorbing layer, sound-insulating layer, and protective layer of the composite noise reduction material are bonded together with an adhesive.
[0012] Furthermore, the composite noise reduction material is bonded to the unit's mounting base.
[0013] Furthermore, the air outlet sound absorption structure is bonded to the air outlet mounting bracket, and the return air sound absorption structure is bonded to the return air outlet mounting bracket.
[0014] Secondly, a bus air conditioning installation structure is proposed, including the bus air conditioning noise reduction structure proposed in the first aspect.
[0015] Thirdly, a bus is proposed, including the bus air conditioning noise reduction structure proposed in the first aspect.
[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention proposes a noise reduction structure for a bus air conditioner, an air conditioner installation structure, and a bus. The noise reduction structure combines a damping layer, a sound-absorbing layer, a sound-insulating layer, and a protective layer to form a composite noise reduction material. This composite noise reduction material is installed between the air conditioning unit and the unit's mounting frame. The layers of the composite noise reduction material complement each other. The damping layer effectively suppresses structural vibration, the sound-absorbing layer enhances the absorption of mid-to-high frequency noise, and the sound-insulating and protective layers improve the sound insulation effect. This achieves a synergistic effect of damping vibration reduction and sound absorption noise reduction, effectively reducing vibration noise and aerodynamic noise generated by the air conditioner. Compared with traditional foam materials, this represents a comprehensive upgrade in noise reduction function and significantly improves the noise environment inside the vehicle. In addition, sound-absorbing structures are installed at both the air conditioning outlet and return air inlet. These sound-absorbing structures at these two locations target noise reduction at the return air inlet and outlet, further enhancing the noise reduction effect of the air conditioner.
[0017] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.
[0019] Figure 1 This is a schematic diagram of a noise reduction structure for a bus air conditioner according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the installation of the air outlet sound absorption structure.
[0020] The components include: 1. Air conditioning unit, 2. Damping layer, 3. Sound absorption layer, 4. Sound insulation and protection layer, 5. Unit mounting base, 6. Air outlet sound absorption structure, and 7. Air conditioning outlet. Detailed Implementation
[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0022] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.
[0023] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0024] In this invention, terms such as "upper," "lower," "left," "right," "front," "back," "vertical," "horizontal," "side," and "bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used only to facilitate the description of the structural relationships of the various components or elements of this invention and do not specifically refer to any component or element in this invention. They should not be construed as limiting the invention.
[0025] In this invention, terms such as "fixed connection," "connected," and "linked" should be interpreted broadly, indicating a fixed connection, an integral connection, or a detachable connection; a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can determine the specific meaning of these terms in this invention based on the specific circumstances, and they should not be construed as limitations on the invention.
[0026] Where there is no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.
[0027] To improve the noise reduction effect and stability of bus air conditioning, and to solve the problems of poor noise reduction effect, insufficient stability, and easy aging and detachment of existing bus air conditioning foam noise reduction technology, this invention proposes a bus air conditioning noise reduction structure that improves the noise reduction efficiency of the air conditioner, is durable, easy to install, and significantly enhances the passenger comfort of the bus.
[0028] like Figure 1 , Figure 2 As shown in the figure, a noise reduction structure for a bus air conditioner proposed in this embodiment of the invention includes: an air conditioning unit 1, a unit mounting frame 5, an outlet air fixing frame, and a return air inlet fixing frame; the air conditioning unit is fixed on the unit mounting frame, the air conditioning outlet air 7 is fixed on the outlet air fixing frame, and the air conditioning return air inlet is fixed on the return air inlet fixing frame. Composite noise reduction material is installed between the air conditioning unit 1 and the unit mounting frame 5; an air outlet sound absorption structure 6 is installed between the air conditioning outlet 7 and the outlet fixing frame; and a return air sound absorption structure is installed between the air conditioning return air outlet and the return air outlet fixing frame. The composite noise reduction material includes a damping layer 2, a sound-absorbing layer 3, a sound-insulating layer, and a protective layer stacked sequentially.
[0029] The sound insulation layer and the protective layer together form the sound insulation and protective layer 4.
[0030] In some embodiments, the damping layer 2 of the composite noise reduction material is located on the side of the air conditioning unit 1, and the protective layer is located on the side of the unit mounting frame 5.
[0031] Damping layer 2, sound-absorbing layer 3, sound insulation layer and protective layer are installed sequentially from the air conditioning unit side to the unit mounting base.
[0032] By setting composite noise reduction material between the air conditioning unit 1 and the unit mounting frame 5, the air conditioning noise is reduced by the composite noise reduction material, realizing the synergistic effect of damping vibration reduction and sound absorption noise reduction. The original foaming structure in the steel frame of the bus air conditioning installation area is eliminated, breaking through the limitations of the traditional single foaming process, solving the technical problem that a single material cannot simultaneously cope with structural noise and air noise, and improving the noise reduction effect of the bus air conditioning.
[0033] An air outlet sound-absorbing structure 6 is installed between the air conditioner outlet 7 and the outlet mounting bracket, and a return air sound-absorbing structure is installed between the air conditioner return air outlet and the return air outlet mounting bracket. This targeted noise reduction addresses the key noise propagation paths of the air conditioner return air outlet and the air conditioner outlet, filling the gap in traditional processes for noise treatment of return air outlets and outlets.
[0034] The composite noise reduction material has complementary functions in each layer. The damping layer effectively suppresses structural vibration, the sound-absorbing layer enhances the absorption of mid-to-high frequency noise, and the sound insulation layer and protective layer improve the sound insulation and barrier effect. It achieves the synergistic effect of damping vibration reduction and sound absorption and noise reduction, which is a comprehensive upgrade of noise reduction function compared with traditional foaming materials. It can effectively reduce the vibration noise and aerodynamic noise generated by air conditioning operation. The overall noise reduction is more than 30% higher than that of traditional foaming process, and the noise environment inside the vehicle is significantly improved.
[0035] In some embodiments, the damping layer in the composite noise reduction material is made of butyl rubber damping material; the sound-absorbing layer in the composite noise reduction material is made of felt sound-absorbing cotton; the sound insulation layer in the composite noise reduction material is made of EVA material; and the protective layer in the composite noise reduction material is made of PE material.
[0036] Among them, white felt sound-absorbing cotton is preferred.
[0037] Butyl rubber damping materials, EVA (ethylene-vinyl acetate copolymer), and PE (polyethylene) materials have excellent aging resistance and anti-shedding ability. White felt sound-absorbing cotton is not easily deformed and can maintain stable noise reduction performance after long-term use. Its service life is 2-3 times longer than that of foamed materials, thus improving the stability of noise reduction in bus air conditioning.
[0038] In some embodiments, the composite noise reduction material has a damping layer thickness of 2±0.3mm, a sound-absorbing layer thickness of 30±1mm, a sound-insulating layer thickness of 2±0.3mm, and a protective layer thickness of 3±0.3mm.
[0039] The composite noise reduction material is bonded to the unit's mounting frame; the damping layer, sound-absorbing layer, sound-insulating layer, and protective layer of the composite noise reduction material are bonded together with an adhesive.
[0040] Composite noise reduction materials can be prefabricated by bonding a damping layer, a sound-absorbing layer, a sound-insulating layer, and a protective layer together. The bonding material is an environmentally friendly adhesive, and the bonding and fixing method is simple and efficient. It does not require complex foaming equipment and processes, and the construction efficiency is increased by 50%. Moreover, the construction process is environmentally friendly and odorless. The composite material is readily available, and the overall cost is basically the same as that of traditional foaming processes, which combines economy and practicality.
[0041] In some embodiments, both the exhaust sound-absorbing structure and the return sound-absorbing structure are sound-absorbing layers made of corrugated sound-absorbing cotton.
[0042] The air outlet sound-absorbing structure is bonded to the air outlet mounting bracket, and the return air sound-absorbing structure is bonded to the return air outlet mounting bracket.
[0043] The preferred material for the wave-shaped sound-absorbing cotton is black wave-shaped sound-absorbing cotton. The black wave-shaped sound-absorbing cotton is filled between the air conditioner outlet panel and the outlet mounting bracket, and between the air conditioner return air outlet panel and the return air outlet mounting bracket, forming a targeted noise reduction structure for the air outlet.
[0044] By installing sound-absorbing structures at both the air outlet and return air inlet of the air conditioner, targeted noise reduction is achieved at the air outlet and return air inlet, further enhancing the noise reduction effect of the air conditioner.
[0045] Among them, the composite noise reduction material can cover the overlapping surface between the air conditioning unit 1 and the unit mounting base 5; the air outlet sound absorption structure 6 can cover the overlapping surface between the air conditioning outlet panel and the outlet mounting bracket; and the return air sound absorption structure can cover the overlapping surface between the air conditioning return air outlet panel and the return air outlet mounting bracket, thereby ensuring the maximum noise reduction effect of the air conditioning.
[0046] The unit mounting base 5, outlet air fixing bracket and return air fixing bracket mentioned in the embodiments of the present invention can all use existing steel frames, without the need to install foam structures on the steel frames.
[0047] The present invention proposes a noise reduction structure for bus air conditioning, which is compatible with the existing air conditioning roof frame and return air vent structure of various buses. It does not require modification of the original vehicle frame, has a wide range of applications, and good compatibility.
[0048] The installation process of a bus air conditioning noise reduction structure according to an embodiment of the present invention includes: 1. Material Preparation: Select 2mm thick butyl rubber damping sheets, 30mm thick high-density white felt sound-absorbing cotton, 3mm thick EVA sheets, and 2mm thick PE sheets. These four layers are bonded together sequentially using environmentally friendly hot melt adhesive and pressed into an integrated composite noise reduction material. The material is then cut to a shape perfectly suited to the dimensions of the unit's mounting frame. The mounting frame can be an existing steel frame for the roof of a bus air conditioning unit.
[0049] 2. Unit mounting base treatment: Use a cleaning agent to remove dust, oil stains and residual adhesive from the unit mounting base, ensuring that the surface of the unit mounting base is dry, free of impurities and residual adhesive; after air drying, apply a layer of adhesive evenly to the side of the unit mounting base facing the air conditioning unit.
[0050] 3. Installation of composite noise reduction material: Apply the prefabricated composite noise reduction material to the unit mounting base, press to ensure seamless adhesion of all parts, and reinforce the edges of the composite noise reduction material with sealant to prevent it from falling off. Place the composite noise reduction material between the unit mounting base and the air conditioning unit, ensuring that the butyl rubber damping layer is tightly attached to the air conditioning unit and the PE protective layer is tightly attached to the unit mounting base, achieving seamless adhesion and fixation.
[0051] 4. Treatment of air conditioning outlet and return air inlet: Cut black wavy sound-absorbing cotton of appropriate size according to the length and width of the outlet and return air inlet mounting brackets. The black wavy sound-absorbing cotton has adhesive backing. Use the adhesive backing to firmly stick the black wavy sound-absorbing cotton to the surface of the outlet and return air inlet mounting brackets to form a targeted noise reduction structure for the air outlets, thus completing the installation of the overall noise reduction structure.
[0052] After installation, the bus air conditioner was turned on, and the noise level was measured within 1 meter of the air conditioner vents inside the bus. The results showed that the noise level was reduced by 5-7 dB(A) compared to vehicles treated with traditional foaming processes, and the ride comfort was significantly improved.
[0053] This invention proposes a noise reduction structure for bus air conditioning. Through innovative composite noise reduction materials and a targeted noise reduction structure design for the air vents, it effectively solves the problems of poor performance and insufficient stability associated with traditional foam noise reduction methods for bus air conditioning. This significantly reduces various types of noise generated during air conditioning operation, improving the comfort and quietness of the bus interior. Furthermore, this method is easy to install, cost-effective, highly adaptable, and stable, making it easy to promote and apply on a large scale in bus production and modification, thus possessing significant practical value and market potential.
[0054] This invention also proposes a bus air conditioning installation structure, including a bus air conditioning noise reduction structure proposed in this invention.
[0055] This invention also proposes a bus, including a bus air conditioning noise reduction structure proposed in this invention.
[0056] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.
Claims
1. A noise reduction structure for a bus air conditioning system, characterized in that, include: Air conditioning unit, unit mounting base, outlet air fixing bracket and return air fixing bracket; the air conditioning unit is fixed on the unit mounting base, the air conditioning outlet air is fixed on the outlet fixing bracket, and the air conditioning return air is fixed on the return air fixing bracket. Composite noise reduction material is installed between the air conditioning unit and the unit mounting frame; an air outlet sound absorption structure is installed between the air conditioning outlet and the outlet mounting bracket; and a return air sound absorption structure is installed between the air conditioning return air outlet and the return air mounting bracket. The composite noise reduction material includes a damping layer, a sound-absorbing layer, a sound-insulating layer, and a protective layer stacked sequentially.
2. The noise reduction structure for a bus air conditioner as described in claim 1, characterized in that, The damping layer is located on the side of the air conditioning unit, and the protective layer is located on the side of the unit mounting frame.
3. The noise reduction structure for a bus air conditioner as described in claim 1, characterized in that, The damping layer in the composite noise reduction material uses butyl rubber damping material; the sound absorption layer in the composite noise reduction material uses felt sound-absorbing cotton; the sound insulation layer in the composite noise reduction material uses EVA material; and the protective layer in the composite noise reduction material uses PE material.
4. The noise reduction structure for a bus air conditioner as described in claim 1, characterized in that, The composite noise reduction material has a damping layer thickness of 2±0.3mm, a sound-absorbing layer thickness of 30±1mm, a sound-insulating layer thickness of 2±0.3mm, and a protective layer thickness of 3±0.3mm.
5. The noise reduction structure for a bus air conditioner as described in claim 1, characterized in that, Both the exhaust and return air sound absorption structures use sound-absorbing layers made of corrugated sound-absorbing cotton.
6. The noise reduction structure for a bus air conditioner as described in claim 1, characterized in that, The damping layer, sound-absorbing layer, sound-insulating layer, and protective layer of the composite noise reduction material are bonded together with an adhesive.
7. The noise reduction structure for a bus air conditioner as described in claim 1, characterized in that, The composite noise reduction material is bonded to the unit's mounting base.
8. The noise reduction structure for a bus air conditioner as described in claim 1, characterized in that, The air outlet sound-absorbing structure is bonded to the air outlet mounting bracket, and the return air sound-absorbing structure is bonded to the return air outlet mounting bracket.
9. A bus air conditioning installation structure, characterized in that, The invention includes a noise reduction structure for a bus air conditioning system as described in any one of claims 1-8.
10. A passenger vehicle, characterized in that, The invention includes a noise reduction structure for a bus air conditioning system as described in any one of claims 1-8.