Ventilation silencing device and energy storage heat management system

Abstract

The invention discloses a ventilation silencing device and an energy storage heat management system, belongs to the technical field of silencers, and aims at solving the problems that an existing silencer is inconvenient to disassemble, assemble and transport and the like. The ventilation silencing device comprises a frame body which comprises two end plates and two side plates, the two end plates and the two side plates are used for forming a ventilation pipeline in a surrounding mode, and each end plate is detachably connected between the two side plates; the sound absorption part is located in the ventilation pipeline and detachably connected to the side plate, the sound absorption part comprises a shell and a composite sound absorption inner core arranged in the shell, the composite sound absorption inner core at least comprises three sound absorption layers which are sequentially arranged in an attached mode, and the material density of the outer sound absorption layer is lower than that of the inner sound absorption layer. The ventilation silencing device and the energy storage heat management system are convenient to disassemble and assemble and low in transportation difficulty; the composite sound absorption inner core can absorb medium-high frequency and low frequency noise at the same time, the problem that an existing silencer can only process the medium-high frequency noise is solved, and the noise reduction effect is good.

Description

Technical Field

[0001] The present invention relates to the technical field of silencers, and in particular to a ventilation and silencer device and an energy storage thermal management system. Background Art

[0002] Many devices, including energy storage thermal management systems, generate heat during operation. To minimize the impact on the device's operation, ventilation systems are required for cooling. The cold air flowing through the ventilation system creates noise, so a muffler can be installed to enhance the user experience.

[0003] Some existing mufflers consist of a shell with multiple air outlets spaced apart at the outlet end, and sound-absorbing material applied to the walls of the air outlets. These mufflers have drawbacks: the shell and the baffles separating the air outlets are integrated into a single structure, resulting in a relatively large and heavy structure, making assembly, disassembly, and transportation inconvenient. Furthermore, they can only handle mid- and high-frequency noise and are unable to effectively handle wide-band noise from low to high frequencies (63Hz to 8000Hz), particularly when low-frequency noise dominates the spectrum. Summary of the Invention

[0004] The purpose of the present invention is to provide a ventilation and silencer device and an energy storage thermal management system, which solves the problem that the existing silencer is inconvenient to disassemble, assemble and transport, and has a good noise reduction effect.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A ventilation and sound-silencing device includes: a frame, including two end panels and two side panels for enclosing a ventilation duct, each of the end panels being detachably connected between the two side panels; and a sound-absorbing member located in the ventilation duct and detachably connected to the side panels, the sound-absorbing member including an outer shell and a composite sound-absorbing inner core arranged within the outer shell, the composite sound-absorbing inner core including at least three sound-absorbing layers laminated together in sequence, the material density of the outer sound-absorbing layer being lower than the material density of the inner sound-absorbing layer.

[0007] In one of the preferred embodiments, the end plate includes an end plate body and an end plate cover, and the end plate cover and the end plate body are buckled together to form a cavity for filling with sound-absorbing material, and the side of the end plate body facing the ventilation duct is provided with a through hole; and / or, the side panel includes a side panel body and a side panel cover, and the side panel body and the side panel cover are buckled together to form a cavity for filling with sound-absorbing material, and the side of the side panel body facing the ventilation duct is provided with a through hole.

[0008] In one of the preferred embodiments, the sound absorbing component includes an air outlet end close to the air outlet of the ventilation duct and an air inlet end close to the air inlet of the ventilation duct, the air outlet end is bent relative to the air inlet end, and the bending direction of the air outlet end is perpendicular to the direction of gas flow.

[0009] In one preferred embodiment, the angle α between the air outlet and the air inlet is between 0° and 30°.

[0010] In one of the preferred embodiments, the sound absorbing component further includes a resonance silencer cavity, which is located on a side of the outer shell close to the air inlet of the ventilation duct. The cross-section of the resonance silencer cavity along the air flow direction is triangular, and the resonance silencer cavity and the space where the composite sound absorbing core is located are isolated from each other by a partition.

[0011] In one preferred embodiment, the windward side of the resonant silencer cavity includes two resonant silencer side surfaces, one of the resonant silencer side surfaces is provided with a circular hole, and the area of the circular hole satisfies the following formula:

[0012]

[0013] Where f is the frequency to be eliminated, in Hz; c is the speed of sound, in m / s; A is the area of the circular hole, in m 2 ; V is the volume of the resonant muffler cavity, in m 3 ; t is the thickness of the sheet metal plate used to prepare the resonant silencing cavity, in m.

[0014] In one preferred embodiment, a compression pad made of a flexible material is provided between any two connected structures among the end panels, the side panels and all the sound absorbing components.

[0015] In one preferred embodiment, the material density of the outer sound absorbing layer is 32 kg / m 3 Up to 48Kg / m 3 The material density of the inner sound absorbing layer is between 60kg / m 3 Up to 80kg / m 3 between.

[0016] In one preferred embodiment, the two side panels are parallel and spaced apart, the sound absorbing member is vertically connected between the two side panels, and the sound absorbing member is interference fit with the frame.

[0017] On the other hand, the present invention adopts the following technical solutions:

[0018] The energy storage thermal management system includes an energy storage thermal management box, and the energy storage thermal management system also includes the above-mentioned ventilation and silencer device, which is arranged on the top surface or side surface of the energy storage thermal management box.

[0019] The ventilation and silencer device disclosed in the present invention includes multiple independent structures, which are assembled together after being transported to the work site, are easy to assemble and disassemble, and have low transportation difficulty; the sound-absorbing component includes a composite sound-absorbing inner core, which is formed by an outer layer using a low-density material and a middle layer using a high-density material, and can absorb medium-high frequency and low-frequency noise at the same time, solving the problem that existing silencers can only handle medium-high frequency noise; the density of the material used to prepare the composite sound-absorbing inner core gradually increases from the outside to the inside, and the acoustic impedance gradually increases, which is conducive to the entry and absorption of sound waves, realizes enhanced absorption of low frequencies, and has a good noise reduction effect.

[0020] The energy storage thermal management system disclosed in the present invention includes the above-mentioned ventilation and silencer device, which can absorb medium-high frequency and low-frequency noise at the same time, and has a good noise reduction effect; the ventilation and silencer device can be divided into multiple independent small structures, which can be assembled into a ventilation and silencer device after arriving at the work site, which is convenient for transportation; the ventilation and silencer device can be set on the side or top surface of the energy storage thermal management box, can adapt to various site environments, avoid collision with surrounding objects, and is more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of an energy storage thermal management system provided by a specific embodiment of the present invention;

[0022] Figure 2 It is a structural diagram of another energy storage thermal management system provided by a specific embodiment of the present invention;

[0023] Figure 3 This is one of the structural schematic diagrams of the ventilation and silencer device provided in a specific embodiment of the present invention;

[0024] Figure 4 This is the second structural diagram of the ventilation and silencer device provided in a specific embodiment of the present invention;

[0025] Figure 5 is an exploded view of a ventilation and silencer device provided in a specific embodiment of the present invention;

[0026] Figure 6 is a structural schematic diagram of a sound absorbing member provided in a specific embodiment of the present invention;

[0027] Figure 7 Schematic diagram of the structure of the composite sound-absorbing core provided by a specific embodiment of the present invention;

[0028] Figure 8 This is a comparison diagram of the working distance between a single sound absorbing layer and a double sound absorbing layer provided in a specific embodiment of the present invention;

[0029] Figure 9Schematic diagram of the structure of the housing, the resonance muffler cavity and the partition provided by the specific embodiment of the present invention;

[0030] Figure 10 is a side view of a sound absorbing member provided in a specific embodiment of the present invention;

[0031] Figure 11 It is a schematic diagram of pressure loss calculation provided by a specific embodiment of the present invention;

[0032] Figure 12 is a structural schematic diagram of a second shell provided by a specific embodiment of the present invention;

[0033] Figure 13 is a structural schematic diagram of a first shell provided by a specific embodiment of the present invention;

[0034] Figure 14 Schematic diagram of noise attenuation in a Helmholtz resonant cavity provided by a specific embodiment of the present invention;

[0035] Figure 15 It is a schematic structural diagram of a resonance muffler cavity provided in a specific embodiment of the present invention.

[0036] In the picture:

[0037] 1. Frame; 2. Sound-absorbing component; 3. Energy storage thermal management box; 11. End plate; 12. Side plate; 13. Ventilation duct; 14. Waist-shaped perforated plate; 21. Outer shell; 22. Composite sound-absorbing core; 23. Air outlet; 24. Air inlet; 25. Resonance silencer cavity; 26. Partition; 111. End plate body; 112. End plate cover; 121. Side plate body; 122. Side plate cover; 211. First shell; 212. Second shell; 213. Connecting fold; 221. Outer sound-absorbing layer; 222. Inner sound-absorbing layer; 251. Resonance silencer side; 252. Circular hole. DETAILED DESCRIPTION

[0038] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0039] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0041] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0042] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0043] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0044] This embodiment discloses a ventilation and silencer device and an energy storage thermal management system, such as Figure 1 and Figure 2 As shown, the energy storage thermal management system includes an energy storage thermal management box 3, and the ventilation and silencer device is arranged on the side of the energy storage thermal management box 3 (as shown in FIG. Figure 1 as shown) and the top surface (as Figure 2 It can adapt to various site environments, avoid collisions with surrounding objects, and is more convenient to use.

[0045] like Figures 1 to 8 As shown, the ventilation and silencer device includes a frame 1 and a sound absorbing member 2, wherein the frame 1 includes two end panels 11 and two side panels 12, and each end panel 11 is detachably connected between two side panels 12, that is, one end panel 11, one side panel 12, one end panel 11 and one side panel 12 are sequentially connected to form a ventilation duct 13, and the sound absorbing member 2 is located in the ventilation duct 13 and is detachably connected to the side panels 12.

[0046] The ventilation and silencer device is disassembled into multiple independent structures and then reassembled after being transported to the work site, making disassembly and assembly easy and transporting simple. The frame 1 is connected to the energy storage thermal management box 3. The specific connection structure between the frame 1 and the energy storage thermal management box 3 is not limited and can be, but is not limited to, a fixed connection achieved by a bent plate and bolts.

[0047] The sound-absorbing element 2 comprises an outer shell 21 and a composite sound-absorbing inner core 22 disposed within the outer shell 21. The outer shell 21 is provided with a through-hole through which sound waves can pass to reach the composite sound-absorbing inner core 22. The composite sound-absorbing inner core comprises at least three sound-absorbing layers laminated together, with the outer sound-absorbing layer 221 having a lower material density than the inner sound-absorbing layer 222. The composite sound-absorbing inner core 22, formed by using a low-density outer layer and a high-density middle layer, can absorb both mid- and high-frequency noise, resolving the problem of existing mufflers being limited to mid- and high-frequency noise. The material density of the composite sound-absorbing inner core 22 gradually increases from the outside to the inside, gradually increasing the acoustic impedance. This facilitates the absorption of sound waves, enhancing the absorption of low-frequency noise and achieving effective noise reduction.

[0048] Figure 8The figure shows the working principle comparison between forming one sound absorbing layer by single density sound absorbing material and forming two sound absorbing layers by composite sound absorbing material. Specifically, Figure 8 a is a sound absorbing layer formed by a single density sound absorbing material. Figure 8 b is two sound-absorbing layers formed by composite sound-absorbing materials.

[0049] When sound waves enter the sound-absorbing material from the air, part of them will be reflected and part of them will be incident. The incident sound waves will be converted into heat energy by the sound-absorbing material and consumed. Therefore, the larger the incident ratio, the better. When the difference between the impedance of the air and the impedance of the sound-absorbing material is smaller, the easier it is for the sound waves to enter. The impedance is calculated according to the following formula:

[0050] Z0=ρ×c

[0051] Where Z0: acoustic impedance kg / (m 2 ×s), ρ: medium density kg / m 3 , c: speed of sound m / s.

[0052] In order to more effectively handle noise in a wide frequency range, especially low-frequency noise, the material used to prepare the sound-absorbing layer must take into account impedance matching to allow sound waves to enter more easily. Generally, the density value selected between high and low density ranges needs to be evaluated based on the weight limit of the ventilation and silencer device. In this embodiment, the material density of the outer sound-absorbing layer 221 is 32kg / m 3 Up to 48Kg / m 3 The material density of the inner sound absorbing layer 222 is 60kg / m 3 Up to 80kg / m 3 between.

[0053] The specific thickness of each layer of the sound-absorbing layer is not limited. In this embodiment, the overall thickness of the sound-absorbing layer is 150 mm, the thickness of the two outer sound-absorbing layers 221 is 50 mm, and the thickness of the inner sound-absorbing layer 222 is also 50 mm. It is easy to process and has a good absorption effect on both medium and high frequency noise and low frequency noise.

[0054] The specific shape and size of the frame 1 are not limited, provided that the cross-sectional area of the ventilation duct 13 meets the ventilation requirements of the energy storage thermal management system. The specific connection method between the end plate 11 and the side plate 12 is not limited. In this embodiment, the end plate 11 and the side plate 12 are fixedly connected using waist-shaped perforated plates 14 and self-tapping screws.

[0055] The specific connection structure between the frame 1 and the sound-absorbing member 2 is not limited. In this embodiment, the two side panels 12 are arranged parallel and spaced apart, and the sound-absorbing member 2 is vertically connected between the two side panels 12. The sound-absorbing member 2 and the frame 1 have an interference fit, providing a more stable connection. To further strengthen the overall structure of the ventilation and silencer device, a flexible waist-shaped perforated plate can be installed between the sound-absorbing member 2 and the side panels 12. The ends of the flexible waist-shaped perforated plate are respectively fixed to the sound-absorbing member 2 and the side panels 12 using self-tapping screws.

[0056] like Figure 5 As shown, the end panel 11 includes an end panel body 111 and an end panel cover 112. The end panel cover 112 and the end panel body 111, when engaged, form a cavity for filling with sound-absorbing material, thereby reducing noise. Correspondingly, the side panel 12 includes a side panel body 121 and a side panel cover 122. When engaged, the side panel body 121 and the side panel cover 122 form a cavity for filling with sound-absorbing material.

[0057] A through hole is opened on the side of the end plate body 111 facing the ventilation duct 13, and a through hole is opened on the side of the side plate body 121 facing the ventilation duct 13. Sound can be absorbed by the sound-absorbing material through the through hole, and the sound-absorbing and noise-reducing effect is good; the airflow will not turn and enter the through hole, and will not affect the normal air outlet.

[0058] like Figure 9 and Figure 10 As shown, the sound absorbing component 2 includes an air outlet end 23 close to the air outlet of the ventilation duct 13 and an air inlet end 24 close to the air inlet of the ventilation duct 13. The air outlet end 23 is bent relative to the air inlet end 24, and the bending direction of the air outlet end 23 is perpendicular to the direction of gas flow.

[0059] The sound-absorbing member 2 with a certain degree of bending can increase the contact area between the sound source and the composite sound-absorbing inner core 22, and has a good sound absorption and noise reduction effect. The larger the angle α between the air outlet end 23 and the air inlet end 24, the larger the contact area between the sound source and the composite sound-absorbing inner core 22, and the better the noise reduction effect. However, the bending structure will increase wind resistance, and the larger the angle α between the air outlet end 23 and the air inlet end 24, the greater the pressure loss. In this embodiment, the angle α between the air outlet end 23 and the air inlet end 24 is between 0° and 30°, preferably 1°, 5°, 10°, 15°, 20°, 25° and 30°. When α is 15°, the pressure loss is 16 Pa, which is a more suitable pressure loss value. Figure 11 The diagram below is a schematic diagram of pressure loss calculation, where simulation software is used to perform pressure loss calculation and evaluation. It is understood that the specific content of the simulation software used is not limited, and any software that can calculate pressure loss in the prior art can be used.

[0060] like Figures 9 to 15As shown, the sound absorbing element 2 also includes a resonant muffler cavity 25 located on the side of the outer shell 21 near the air inlet of the ventilation duct 13. The resonant muffler cavity 25 has a triangular cross-section along the airflow direction. While the sound-absorbing material in the sound absorbing element 2 can eliminate low-frequency noise, the resonant muffler cavity 25 is isolated from the space containing the composite sound-absorbing core 22 by a partition 26.

[0061] The windward side of the resonant muffler cavity 25 includes two resonant muffler side surfaces 251. One of the resonant muffler side surfaces 251 is provided with a circular hole 252, forming a low-frequency resonant cavity. The size of the circular hole 252 can be adjusted to adjust the frequency of the noise it can attenuate. In this embodiment, the area of the circular hole 252 satisfies the following formula:

[0062]

[0063] Where f is the frequency to be eliminated, in Hz; c is the speed of sound, in m / s; A is the area of the circular hole 252, in m 2 ; V is the volume of the resonance muffler cavity 25, in m 3 ; t is the thickness of the sheet metal plate used to prepare the resonant silencer cavity 25, in m.

[0064] In this embodiment, the volume of the triangular resonance muffler cavity 25 is V=4.19E-4m 3 The thickness of the sheet metal is t=1.5E-3m. Attenuation treatment is performed for 250Hz noise. According to the formula, the diameter of the circular hole 252 is calculated to be 4.2mm.

[0065] A triangular, wedge-shaped resonant muffler chamber 25 is positioned at the air inlet to reduce air resistance. A circular hole 252 is provided on the side 251 of the resonant muffler. This utilizes the principle of a Helmholtz resonant cavity to address specific low-frequency noise that is difficult for sound-absorbing materials to absorb, attenuating the sound energy and reducing the low-frequency noise. The principle is that when the frequency of external noise matches the resonant frequency, the air column at the neck of the circular hole 252 vibrates violently, forming a low-frequency resonant cavity. The sound energy is converted into heat through viscous friction and heat conduction, dissipating it and thus eliminating the low-frequency noise.

[0066] By treating specific low-frequency noise through the resonant muffler cavity 25, the overall target noise level is effectively reduced, resulting in excellent noise reduction. The size of the resonant muffler cavity 25 is not limited and can be designed based on the structural dimensions of the sound absorbing member 2, without considering the resonance attenuation of noise. When the sound absorbing member 2 is bent to a certain degree, the triangular wedge-shaped resonant muffler cavity 25 points vertically downward and does not bend with the bending of the sound absorbing member 2.

[0067] Based on the above structure, the outer shell 21 of the sound-absorbing element 2 comprises a first shell 211 and a second shell 212, which enclose a cavity for accommodating the composite sound-absorbing core 22. A connecting flange 213 is formed on the second shell 212. During assembly, the connecting flange 213 is affixed to the first shell 211, allowing for efficient and simple processing.

[0068] Compression pads made of flexible material (such as rubber) are provided at the fitting locations between any two connected structures of the end panels 11, the side panels 12 and all the sound absorbing components 2 to reduce gaps and make the connection tighter.

[0069] The following data compares the noise reduction effects of various noise reduction devices.

[0070] Table 1 below shows the original noise values measured at 1m from the air outlet:

[0071]

[0072] The goal of designing ventilation and silencer devices is to achieve a total noise attenuation of no less than 10dB(A) at the same measuring point. The design formula is:

[0073] ΔL=Φ(a)×L×P / S(dB)

[0074] Wherein: ΔL: sound attenuation of the ventilation and silencer device at a certain flow rate in dB; Φ(a): static sound absorption coefficient obtained by the sound-absorbing material a0; a0: sound absorption coefficient measured by the standing wave tube method, Φ(a) = 1.6a0; L: height of the ventilation and silencer device protruding from the surface of the energy storage thermal management box 3, i.e., the height of the side panel 12 along the airflow direction, in meters; P: perimeter of the inner cross-section of a single channel formed between two adjacent sound-absorbing members 2; S: inner cross-sectional area of the single channel formed between two adjacent sound-absorbing members 2.

[0075] The length of the single channel formed between two adjacent sound absorbing members 2 is D1, and the width is D2, so P = 2 × (D1 + D2), the unit is (m); S = D1 × D2, the unit is (m 2 In this embodiment, L=600 mm, D1=110 mm, and D2=800 mm.

[0076] The sound absorption coefficient a0 can be determined according to the sound absorption material used. When polyester fiber is used as the sound absorption material, the sound absorption coefficient of polyester fiber is 0.7.

[0077] The thickness of the protective plate surrounding the outer shell 21 also needs to be determined. This thickness is based on 1 / 8 of the wavelength of the lower frequency limit of the noise spectrum. Theoretically, a thicker plate provides better coverage, but the actual thickness will be limited by the project space. In engineering, a thickness of around 100mm is generally used. In this embodiment, the low-frequency noise energy of the sound source accounts for a significant proportion, so a thickness of 150mm is used.

[0078] Based on the above data, it is calculated that the total noise attenuation can reach 13.9dB(A).

[0079] Table 2 below shows the noise reduction statistics of the measured values of conventionally designed silencers:

[0080]

[0081] The actual total attenuation is 4.4dB(A), which falls short of the 10dB(A) requirement and differs significantly from theoretical calculations. Analyzing the spectrum, in the low-frequency band below 500Hz, attenuation is 6dB(A) at 500Hz, with virtually no attenuation at 63Hz, 125Hz, and 250Hz. Furthermore, the low-frequency bands contain a significant proportion of energy, particularly at 250Hz.

[0082] Further analysis shows that the high frequency band of the entire spectrum can be attenuated to 10dB(A). The simplest solution at present is to continue to increase the thickness of the sheet, but due to the limitations of actual engineering applications, it is obviously impossible to continue to increase the thickness of the sheet, so further analysis and optimization are carried out based on the characteristics of the sound-absorbing material.

[0083] The conventional design in the prior art is to fill the sound-absorbing material with a single density, generally taking a low density of 32Kg / m 3 Up to 48Kg / m 3 This can cover a certain wide frequency range and allow sound waves to enter the sound-absorbing material as much as possible. This is because the acoustic impedance of air must match the acoustic impedance of the sound-absorbing material as much as possible, and the difference between the two impedances must be as small as possible, so that sound waves can easily enter.

[0084] The characteristic of sound waves is that the higher the frequency, the shorter the wavelength, while the lower the frequency, the longer the wavelength. Short wavelengths are more easily incident on low-density sound-absorbing materials. Because the density of sound-absorbing materials is low, their impedance is closer to that of air, making it easier for sound waves to enter. Therefore, low-density sound-absorbing materials are usually used when filling sound-absorbing materials. However, this also results in poor attenuation of low-frequency noise by the muffler. Because low-frequency wavelengths are long and have strong diffraction properties, they require a high-density sound-absorbing material to absorb them.

[0085] Table 3 below shows the statistical data of the composite sound-absorbing material silencer measurements:

[0086]

[0087] The actual attenuation is 8.9dB(A), which is 4.5dB(A) higher than the attenuation value of 4.4dB(A) of the conventionally designed silencer. This shows that the composite material has a significant effect on improving the performance of the silencer.

[0088] However, judging from the target value of not less than 10dB(A), the requirement has not been met. Analyzing the spectrum, after using the composite sound-absorbing material, the attenuation at 500Hz and 250Hz has increased significantly, reaching 11.7dB(A) at 500Hz and 5.5dB(A) at 250Hz. Judging from the proportion of spectrum energy, the energy attenuation of high frequencies is sufficient, and further attenuation of high frequencies has no effect on reducing the total value. Only by further attenuating the energy of low frequencies can the total value be attenuated.

[0089] Table 4 below shows the statistical data of the measured values using composite materials + resonant cavity silencers:

[0090]

[0091] The total attenuation value reached 11.4dB(A), meeting the design requirements. From the test spectrum, in the low frequency band, especially at 250Hz, the attenuation was 3.8dB(A) higher than the previous maximum, which further verified the feasibility of the theory from the experiment.

[0092] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A ventilation and silencer device, characterized in that: include: A frame (1) comprising two end plates (11) and two side plates (12) for enclosing a ventilation duct (13), wherein each end plate (11) is detachably connected between the two side plates (12); and A sound absorbing member (2) is located in the ventilation duct (13) and is detachably connected to the side panel (12). The sound absorbing member (2) comprises an outer shell (21) and a composite sound absorbing inner core (22) arranged in the outer shell (21). The composite sound absorbing inner core comprises at least three sound absorbing layers that are sequentially laminated. The material density of the outer sound absorbing layer (221) is lower than the material density of the inner sound absorbing layer (222).

2. The ventilation and silencer device according to claim 1, characterized in that: The end plate (11) comprises an end plate body (111) and an end plate cover (112); the end plate cover (112) and the end plate body (111) are fastened together to form a cavity for filling with sound-absorbing material; a through hole is provided on a side of the end plate body (111) facing the ventilation duct (13); and / or, The side panel (12) comprises a side panel body (121) and a side panel cover (122); the side panel body (121) and the side panel cover (122) are buckled together to form a cavity for filling with sound-absorbing material; a through hole is provided on the side of the side panel body (121) facing the ventilation duct (13).

3. The ventilation and silencer device according to claim 1, characterized in that: The sound absorbing member (2) comprises an air outlet end (23) close to the air outlet of the ventilation duct (13) and an air inlet end (24) close to the air inlet of the ventilation duct (13); the air outlet end (23) is bent relative to the air inlet end (24); and the bending direction of the air outlet end (23) is perpendicular to the direction of gas flow.

4. The ventilation and silencer device according to claim 3, characterized in that: The included angle α between the air outlet end (23) and the air inlet end (24) is between 0° and 30°.

5. The ventilation and silencer device according to claim 1, characterized in that: The sound absorbing member (2) further comprises a resonance silencing cavity (25), the resonance silencing cavity (25) being located on a side of the outer shell (21) close to the air inlet of the ventilation duct (13), the cross section of the resonance silencing cavity (25) along the air flow direction being triangular, and the resonance silencing cavity (25) and the space where the composite sound absorbing inner core (22) is located being isolated from each other by a partition (26).

6. The ventilation and silencer device according to claim 5, characterized in that: The windward side of the resonance silencing cavity (25) includes two resonance silencing side surfaces (251), one of the resonance silencing side surfaces (251) is provided with a circular hole (252), and the area of the circular hole (252) satisfies the following formula: Wherein, f is the frequency to be eliminated, in Hz; c is the speed of sound, in m / s; A is the area of the circular hole (252), in m 2 ; V is the volume of the resonant muffler cavity (25), in m 3 ; t is the thickness of the sheet metal plate used to prepare the resonant silencer cavity (25), in m.

7. The ventilation and silencer device according to any one of claims 1 to 6, characterized in that: A compression pad made of a flexible material is provided between any two connected structures among the end plate (11), the side plate (12) and all the sound absorbing components (2).

8. The ventilation and silencer device according to any one of claims 1 to 6, characterized in that: The material density of the outer sound absorbing layer (221) is 32 kg / m 3 Up to 48Kg / m 3 The material density of the inner sound absorbing layer (222) is 60 kg / m 3 Up to 80kg / m 3 between.

9. The ventilation and silencer device according to any one of claims 1 to 6, characterized in that: The two side panels (12) are arranged in parallel and at intervals, the sound absorbing member (2) is vertically connected between the two side panels (12), and the sound absorbing member (2) is interference-fitted with the frame (1).

10. An energy storage thermal management system, comprising an energy storage thermal management box (3), characterized in that: The energy storage thermal management system further comprises a ventilation and silencer device according to any one of claims 1 to 9, wherein the ventilation and silencer device is arranged on the top surface or side surface of the energy storage thermal management box (3).

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