A noise reduction structure for an air conditioning duct assembly of a vehicle

Abstract

The utility model discloses a kind of vehicle air conditioner air duct assembly sound attenuation structure, including outer air duct, the inside of outer air duct is provided with inner air duct, sound attenuation cavity I is arranged between inner air duct and outer air duct, the inner wall of outer air duct is relatively fixedly connected with multiple groups of sound attenuation board I, the inside of sound attenuation board I is provided with sound attenuation board II, sound attenuation cavity II is arranged between sound attenuation board II and sound attenuation board I, the inside of sound attenuation cavity II is filled with sound attenuation cotton III, the inside of sound attenuation board II is filled with sound attenuation cotton II, the inside of sound attenuation board I and the inside of sound attenuation board II are all provided with sound attenuation hole II, and one end of outer air duct is installed with air inlet mechanism. It can be overall sound attenuation for outer air duct, to improve the sound attenuation effect of air duct assembly sound attenuation structure, while reducing the NVH performance in vehicle improves the riding comfort of passenger.

Description

Technical Field

[0001] This utility model relates to the field of automotive air conditioning duct technology, specifically to a noise reduction structure for an automotive air conditioning duct assembly. Background Technology

[0002] The air conditioning duct of a car is the core channel for air circulation. When the air flows in the duct, noise is easily generated due to the impact of the duct corners, sudden changes in cross-section, turbulence at the air inlet and outlet, and vibration of components, which directly affects the NVH performance and ride comfort of the car.

[0003] A search revealed a noise-reducing air duct for an automotive air conditioner, disclosed in utility model patent application number 202420764739.9. The air duct includes an air delivery mechanism comprising a rear passenger air duct body. The rear passenger air duct body contains two symmetrically arranged air delivery ducts (secondary and primary), and two symmetrically arranged transition bends. The secondary air delivery ducts are connected to the adjacent primary air delivery duct via these transition bends. The inner bottom surfaces of the two secondary air delivery ducts each have multiple diversion baffles at equal intervals. The inner top surfaces of the secondary air delivery ducts each have multiple guide baffles rotatably connected at equal intervals. Multiple guide baffles are fixedly connected at equal intervals to the two outer walls of each guide baffle. A diversion plate is provided on the top of the rear passenger air duct body, and a control mechanism is provided for synchronously adjusting the angle of multiple guide baffles. Although multiple guide baffles are equidistantly rotatably connected on the inner top wall of the second air duct, and the tops of multiple limiting shafts are connected in series by a control plate and a connecting plate, the diversion baffles guide and disperse the airflow, and the multiple guide baffles actively guide and deflect the airflow through the transition bend section. This can reduce the airflow impact and vortex formation in the transition section of the air duct, facilitate the dispersion and effective guidance of the airflow in the corner of the air duct, thereby alleviating the air duct vibration caused by airflow turning and impact, reducing air duct noise, improving passenger experience, and facilitating use.

[0004] However, since there are many mechanical parts for installing the guide baffle, and some parts are movable connections to facilitate the adjustment of the guide baffle, when the airflow passes through the air duct of the car air conditioner, it will cause the guide baffle and other installed parts to resonate, thereby generating sound and reducing the noise reduction effect of the air conditioning duct. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a noise reduction structure for automotive air conditioning duct assemblies, which solves the problem of mechanical component resonance that is easily caused by traditional automotive air ducts during use, thereby improving the noise reduction effect of automotive air conditioning duct noise reduction structures.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a noise reduction structure for a vehicle air conditioning duct assembly, comprising an outer air duct, an inner air duct inside the outer air duct, a noise reduction cavity I between the inner air duct and the outer air duct, multiple sets of noise reduction plates I fixedly connected to the inner wall of the outer air duct, a noise reduction plate II inside the noise reduction plate I, a noise reduction cavity II between the noise reduction plate II and the noise reduction plate I, a noise reduction cotton III filled inside the noise reduction cavity II, a noise reduction cotton II filled on the inner side of the noise reduction plate II, noise reduction holes II opened inside both the noise reduction plate I and the noise reduction plate II, and an air intake mechanism installed at one end of the outer air duct.

[0007] Preferably, a sound-absorbing block is provided inside the sound-absorbing hole II inside the sound-absorbing plate I. The side surface of the sound-absorbing block is rough and the two ends of the sound-absorbing block are fixedly connected to the inner sidewall of the sound-absorbing hole II.

[0008] Preferably, both the sound-absorbing plate I and the sound-absorbing plate II are arc-shaped structures, and multiple sets of sound-absorbing plates I arranged opposite to each other are staggered.

[0009] Preferably, the inner sidewall of the inner air duct is provided with a sound-absorbing hole I facing the vehicle, the sound-absorbing hole I is connected to the sound-absorbing cavity I, and the interior of the sound-absorbing cavity I is filled with sound-absorbing cotton I.

[0010] Preferably, the air intake mechanism includes an air intake pipe, one end of which is fixedly connected to a fan cover, and a fan wheel is rotatably connected inside the fan cover.

[0011] Preferably, an air outlet pipe is symmetrically and fixedly connected to the other end of the external air duct, and an air outlet is fixedly connected to one end of the air outlet pipe.

[0012] This utility model provides a noise reduction structure for an automotive air conditioning duct assembly. Compared with the prior art, it has the following advantages: By cooperating with the inner air duct inside the outer air duct and the multiple sets of noise reduction plates I inside the inner air duct, the noise reduction cotton III inside the noise reduction plate I and the noise reduction cotton II inside the noise reduction plate II, the noise reduction blocks inside the noise reduction holes II and the noise reduction cotton I inside the noise reduction cavity I, the outer air duct can be comprehensively noise-reduced, thereby improving the noise reduction effect of the duct assembly noise reduction structure, while reducing the NVH performance inside the vehicle and improving passenger comfort. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This utility model Figure 1 Schematic diagram of the internal structure of the air ducts;

[0015] Figure 3 This utility model Figure 2 Schematic diagram of the internal structure of the central air duct;

[0016] Figure 4 This utility model Figure 3 Enlarged structural diagram of the middle sound-absorbing plate I.

[0017] In the diagram: 1. External air duct; 101. Air inlet pipe; 102. Fan cover; 103. Fan wheel; 104. Sound-absorbing cotton I; 105. Internal air duct; 106. Sound-absorbing hole I; 107. Sound-absorbing cavity I; 2. Air outlet; 201. Air outlet pipe; 3. Sound-absorbing plate I; 301. Sound-absorbing cotton II; 302. Sound-absorbing hole II; 303. Sound-absorbing block; 304. Sound-absorbing cotton III; 305. Sound-absorbing plate II; 306. Sound-absorbing cavity II. Detailed Implementation

[0018] 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.

[0019] Please see Figure 1-4 This utility model provides a technical solution: a noise reduction structure for a vehicle air conditioning duct assembly, including an outer air duct 1, an inner air duct 105 inside the outer air duct 1, a noise reduction cavity I 107 between the inner air duct 105 and the outer air duct 1, multiple sets of noise reduction plates I 3 fixedly connected to the inner wall of the outer air duct 1, a noise reduction plate II 305 inside the noise reduction plate I 3, a noise reduction cavity II 306 between the noise reduction plate II 305 and the noise reduction plate I 3, a noise reduction cotton III 304 inside the noise reduction cavity II 306, a noise reduction cotton II 301 inside the noise reduction plate II 305, noise reduction holes II 302 inside both the noise reduction plate I 3 and the noise reduction plate II 305, and an air intake mechanism installed at one end of the outer air duct 1.

[0020] As a technical optimization of this utility model, a sound-absorbing block 303 is provided inside the sound-absorbing hole II 302 inside the sound-absorbing plate I 3. The side surface of the sound-absorbing block 303 is rough and the two ends of the sound-absorbing block 303 are fixedly connected to the inner side wall of the sound-absorbing hole II 302. The sound-absorbing block 303 inside the sound-absorbing hole II 302 can further refract the sound waves inside the external air duct 1 and further reduce the noise inside the external air duct 1.

[0021] As a technical optimization of this utility model, both the sound-absorbing plate I3 and the sound-absorbing plate II305 are arc-shaped structures, and the multiple sets of sound-absorbing plates I3 are staggered. Through the arc-shaped design of the sound-absorbing plate I3 and the staggered arrangement of the multiple sets of sound-absorbing plates I3, the airflow resistance inside the external air duct 1 can be reduced, thereby reducing the noise generated by the airflow.

[0022] As a technical optimization of this utility model, the inner sidewall of the inner air duct 105 is provided with a noise reduction hole I106 facing the vehicle. The noise reduction hole I106 is connected to the noise reduction cavity I107. The noise reduction cavity I107 is filled with noise reduction cotton I104. The noise reduction cotton I104 filled in the noise reduction cavity I107 and the noise reduction hole I106 opened on the inner sidewall of the inner air duct 105 can further eliminate the noise generated by the airflow.

[0023] As a technical optimization of this utility model, the air intake mechanism includes an air intake pipe 101, one end of which is fixedly connected to a fan cover 102, and a fan wheel 103 is rotatably connected inside the fan cover 102, through which external air can be transported to the interior of the car.

[0024] As a technical optimization of this utility model, an air outlet pipe 201 is symmetrically and fixedly connected to the other end of the external air duct 1, and an air outlet 2 is fixedly connected to one end of the air outlet pipe 201.

[0025] In use, the rotation of the impeller 103 draws external air through the air inlet pipe 101 into the inner air duct 105. The noise generated by the airflow passing through the inner air duct 105 is absorbed by the sound-absorbing cotton 304 inside the sound-absorbing cavity 306 via the sound-absorbing hole 302. The sound waves passing through the sound-absorbing hole 302 rub against the rough surface of the hole, converting some of the energy into heat. The sound waves are divided into two parts. A portion of the sound waves entering the silencing cavity II 306 are absorbed by the silencing cotton II 301 through the silencing holes II 302 inside the silencing plate II 305, thereby improving the sound wave consumption effect and the noise reduction effect. The transverse sound waves enter the silencing cavity I 107 through the silencing holes I 106, and are then absorbed by the silencing cotton I 104 inside the silencing cavity I 107. This allows the external air duct 1 to be completely silencing and reducing noise, and improves the duct silencing effect.

[0026] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0027] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0028] 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 noise reduction structure for an automotive air conditioning duct assembly, comprising an external air duct (1), characterized in that: The outer air duct (1) is provided with an inner air duct (105). A sound-absorbing cavity I (107) is provided between the inner air duct (105) and the outer air duct (1). Multiple sets of sound-absorbing plates I (3) are fixedly connected to the inner wall of the outer air duct (1). A sound-absorbing plate II (305) is provided inside the sound-absorbing plate I (3). A sound-absorbing cavity II (306) is provided between the sound-absorbing plate II (305) and the sound-absorbing plate I (3). The sound-absorbing cavity II (306) is filled with sound-absorbing cotton III (304). The inner side of the sound-absorbing plate II (305) is filled with sound-absorbing cotton II (301). Both the interior of the sound-absorbing plate I (3) and the interior of the sound-absorbing plate II (305) are provided with sound-absorbing holes II (302). An air inlet mechanism is installed at one end of the outer air duct (1).

2. The sound attenuation structure for an air conditioning duct assembly of a vehicle according to claim 1, characterized in that: A sound-absorbing block (303) is provided inside the sound-absorbing hole II (302) inside the sound-absorbing plate I (3). The side surface of the sound-absorbing block (303) is rough and the two ends of the sound-absorbing block (303) are fixedly connected to the inner side wall of the sound-absorbing hole II (302).

3. The sound attenuation structure for an air conditioning duct assembly of a vehicle according to claim 1, characterized in that: Both the silencing plate I (3) and the silencing plate II (305) are arc-shaped structures, and the multiple sets of silencing plates I (3) are arranged in a staggered manner.

4. The sound attenuation structure for an air conditioning duct assembly of a vehicle according to claim 1, characterized in that: The inner wall of the inner air duct (105) is provided with a sound-absorbing hole I (106) facing the vehicle. The sound-absorbing hole I (106) is connected to the sound-absorbing cavity I (107). The sound-absorbing cavity I (107) is filled with sound-absorbing cotton I (104).

5. The sound attenuation structure for an air conditioning duct assembly of a vehicle according to claim 1, characterized in that: The air intake mechanism includes an air intake pipe (101), one end of which is fixedly connected to a fan cover (102), and a fan wheel (103) is rotatably connected inside the fan cover (102).

6. The noise reduction structure for an automotive air conditioning duct assembly according to claim 1, characterized in that: The other end of the external air duct (1) is symmetrically and fixedly connected to an air outlet (201), and one end of the air outlet (201) is fixedly connected to an air outlet (2).

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