Composite multi-stage muffler structure

Abstract

The utility model relates to a kind of composite multi-stage muffler structure, belong to the field of muffler.The structure includes: primary muffler;First sound-absorbing board, fixed in the upper end of primary muffler;Second muffler, fixed in the lower end of primary muffler;Second sound-absorbing board, and its one end is fixedly connected with the end of first sound-absorbing board, and its other end is fixedly connected with the end of second muffler;Wherein, primary muffler and second muffler all include cover, side plate, bottom plate and sheet type muffler box, side plate is fixed between cover and bottom plate, cover has evenly distributed air inlet groove, bottom plate has evenly distributed air outlet groove, sheet type muffler box is located between adjacent air inlet groove, sheet type muffler box and cover are perpendicular to each other, second sound-absorbing board and the inside of first sound-absorbing board all have sound-absorbing cotton.The composite multi-stage muffler structure improves low-frequency noise absorption amount, conveniently meets high noise reduction demand scene, and simultaneously, it is convenient to adapt to indoor window and other narrow scene.

Description

Technical Field

[0001] This utility model relates to the field of silencer technology, and in particular to a composite multi-stage silencer structure. Background Technology

[0002] In the field of noise control for ventilation systems, traditional silencer structures typically employ conventional single-stage silencing structures (such as a single silencing cavity or simple sound-absorbing cotton filling), which have limited effectiveness in reducing broadband noise, especially in absorbing low-frequency noise. This makes it difficult to meet the needs of high noise reduction scenarios, and the loose layout of the silencing units results in low space utilization, making it difficult to adapt to narrow scenarios such as interior windows. Therefore, improvements are needed. Summary of the Invention

[0003] Therefore, it is necessary to provide a composite multi-stage silencer structure to address the problems that traditional silencer structures, which typically use conventional single-stage silencer structures, have limited effectiveness in reducing broadband noise, especially in absorbing low-frequency noise, making it difficult to meet the needs of high noise reduction scenarios. Furthermore, the loose layout of silencer units leads to low space utilization and makes it difficult to adapt to narrow scenarios such as interior windows.

[0004] This utility model provides a composite multi-stage silencer structure, comprising:

[0005] Primary silencer;

[0006] The first sound-absorbing plate is perpendicular to the first-stage silencer and is fixed to the upper end of the first-stage silencer;

[0007] The secondary muffler is perpendicular to the primary muffler and is fixed at the lower end of the primary muffler;

[0008] The second sound-absorbing plate is symmetrically distributed on both sides of the first-stage silencer, with one end of it fixedly connected to the end of the first sound-absorbing plate and the other end of it fixedly connected to the end of the second-stage silencer.

[0009] The primary and secondary silencers each include a cover plate, a side plate, a bottom plate, and a sheet-type silencer box. The side plate is fixed between the cover plate and the bottom plate. The cover plate has evenly distributed air inlet slots, and the bottom plate has evenly distributed air outlet slots. The sheet-type silencer box is located between adjacent air inlet slots. The interior of both the second and first sound-absorbing plates contains sound-absorbing cotton.

[0010] In one embodiment, the primary silencer is fixed between the first sound-absorbing plate and the secondary silencer, and the air inlet slot on the secondary silencer is located on the side close to the air outlet slot on the primary silencer.

[0011] In one embodiment, the first sound-absorbing panel, the second sound-absorbing panel, the secondary silencer, and the inner window are combined to form a sound-absorbing channel.

[0012] In one embodiment, both the primary and secondary silencers further include dustproof and insectproof filters, which are located at the air inlet slot.

[0013] In one embodiment, the secondary muffler further includes a corner fixed to a side plate, the bottom of which is flush with the base plate.

[0014] In one embodiment, each of the air inlet slots corresponds to a set of air outlet slots, and the set of air outlet slots are uniformly distributed rectangular slots.

[0015] In one embodiment, the sheet-type sound-absorbing box includes, in sequence along the thickness direction, an upper cover, a composite microporous sound-absorbing panel, a sound-absorbing material layer, a composite microporous sound-absorbing back panel, and a lower cover, with ventilation slots provided on both the upper and lower covers.

[0016] In one embodiment, the sound-absorbing material layer is made of high-density polyester fiber material.

[0017] The aforementioned composite multi-stage silencer structure, through the vertical series arrangement of a primary silencer, a first sound-absorbing panel, and a secondary silencer, forms a multi-stage silencing chain, which improves the absorption of low-frequency noise and can easily meet the needs of high noise reduction scenarios. At the same time, the double-sided second sound-absorbing panels extend the sound wave reflection path, and the mid-to-high frequency noise reduction is simultaneously improved. In addition, the compact modular design with a vertical stacking structure saves horizontal installation space and is easy to adapt to narrow scenarios such as indoor windows. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of a composite multi-stage silencer structure in one embodiment;

[0020] Figure 2 This is a schematic diagram of the first-stage muffler structure in one embodiment;

[0021] Figure 3 This is a schematic diagram of a two-stage muffler structure in one embodiment;

[0022] Figure 4 This is a schematic diagram illustrating the application of a composite multi-stage silencer structure in one embodiment.

[0023] Figure 5 This is a schematic diagram of a plate-type silencer box structure in one embodiment.

[0024] Figure label:

[0025] 100. Primary silencer; 200. First sound-absorbing panel; 300. Secondary silencer; 310. Cover plate; 320. Side panel; 330. Base plate; 340. Sheet-type silencer box; 341. Top cover; 342. Composite microporous sound-absorbing panel; 343. Sound-absorbing material layer; 344. Composite microporous sound-absorbing back panel; 345. Bottom cover; 346. Ventilation slot; 350. Air inlet slot; 360. Air outlet slot; 370. Dustproof and insect-proof filter; 380. Corner; 400. Second sound-absorbing panel; 500. Silencing channel; 60. Interior window. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0027] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this specification are for illustrative purposes only and do not represent the only possible implementation.

[0028] 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0029] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this specification belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0031] The following is combined with Figures 1-5 This invention describes the structure of a composite multi-stage silencer.

[0032] like Figure 1 , Figure 2 and Figure 3 As shown, in one embodiment, a composite multi-stage silencer structure includes a primary silencer 100, a first sound-absorbing plate 200, a secondary silencer 300, and a second sound-absorbing plate 400.

[0033] The first sound-absorbing panel 200 is perpendicular to the first-stage muffler 100 and is fixed to the upper end of the first-stage muffler 100. The second-stage muffler 300 is perpendicular to the first-stage muffler 100 and is fixed to the lower end of the first-stage muffler 100. The second sound-absorbing panels 400 are symmetrically distributed on both sides of the first-stage muffler 100. One end of the second sound-absorbing panel 400 is fixedly connected to the end of the first sound-absorbing panel 200, and the other end of the second sound-absorbing panel 400 is fixedly connected to the end of the second-stage muffler 300.

[0034] The primary silencer 100 and the secondary silencer 300 both include a cover plate 310, a side plate 320, a bottom plate 330, and a sheet-type silencer box 340. The cover plate 310, the side plate 320, and the bottom plate 330 are integrally formed. The side plate 320 is fixed between the cover plate 310 and the bottom plate 330. The cover plate 310 has evenly distributed air inlet slots 350, and the bottom plate 330 has evenly distributed air outlet slots 360. The sheet-type silencer box 340 is located between adjacent air inlet slots 350. The interior of the second sound-absorbing plate 400 and the first sound-absorbing plate 200 both contain sound-absorbing cotton.

[0035] It should be noted that the plate silencer box 340 and the cover plate 310 are perpendicular to each other, or there is an angle between the plate silencer box 340 and the cover plate 310.

[0036] This composite multi-stage silencer structure uses a vertically connected series layout of a primary silencer 100, a first sound-absorbing panel 200, and a secondary silencer 300 to form a multi-stage silencing chain, which improves the absorption of low-frequency noise below 500Hz, making it convenient to meet high noise reduction requirements. At the same time, the double-sided second sound-absorbing panels 400 extend the sound wave reflection path, and the mid-to-high frequency silencing is improved simultaneously. In addition, the compact modular design with a vertical stacking structure saves horizontal installation space and is easy to adapt to narrow scenarios such as indoor windows.

[0037] In this embodiment, the primary silencer 100 is fixed between the first sound-absorbing plate 200 and the secondary silencer 300, and the air inlet slot 350 on the secondary silencer 300 is located on the side close to the air outlet slot 360 on the primary silencer 100.

[0038] After passing through the primary silencer 100 and the first sound-absorbing plate 200, the airflow enters the secondary silencer 300 through the air inlet slot 350 for noise reduction.

[0039] In this embodiment, see Figure 4 The first sound-absorbing panel 200, the second sound-absorbing panel 400, the secondary silencer 300, and the inner window 60 are combined to form a sound-absorbing channel 500.

[0040] The existing window frames and sound-absorbing panels are used to enclose the passageway, reducing the amount of wall modification required.

[0041] In this embodiment, both the primary silencer 100 and the secondary silencer 300 further include a dustproof and insect-proof filter 370, which is located at the air inlet slot 350.

[0042] The dust and insect filter 370 is pre-mounted for easy interception of PM10 particles, thereby extending the lifespan of the plate silencer box 340.

[0043] In this embodiment, the secondary muffler 300 also includes a corner 380, which is fixed on the side plate 320, and the bottom of the corner 380 is flush with the bottom plate 330.

[0044] It should be added that the 380-degree bend features a 45°-90° arc-shaped flow channel design, which guides the airflow to turn smoothly and avoids turbulent noise generated by right-angle bends. At the same time, when it is cantilevered and installed at the bottom of the inner window 60, it can support the weight of the composite multi-stage silencer structure itself.

[0045] In this embodiment, each air inlet slot 350 corresponds to a set of air outlet slots 360, and the set of air outlet slots 360 are uniformly distributed rectangular slots.

[0046] Each air inlet slot 350 uses a single large-sized air slot to improve air intake efficiency, while each air outlet slot 360 uses a matrix of rectangular slots to facilitate even distribution of airflow from the air outlet slot 360 and reduce airflow self-excitation noise.

[0047] In this embodiment, see Figure 5 The sheet-type sound-absorbing box 340 includes, along its thickness direction, an upper cover 341, a composite microporous sound-absorbing panel 342, a sound-absorbing material layer 343, a composite microporous sound-absorbing back panel 344, and a lower cover 345. Ventilation slots 346 are provided on both the upper cover 341 and the lower cover 345.

[0048] The composite pinhole double-sided sandwich structure of composite microporous sound-absorbing panel 342 and composite microporous sound-absorbing back panel 344 achieves dual impedance matching between surface microporous resonance and back broadband sound absorption, resulting in a sound absorption coefficient of >0.95 at 100–1000Hz.

[0049] It should be noted that the sound-absorbing material layer 343 is made of high-density polyester fiber material.

[0050] The specific airflow noise reduction process is as follows:

[0051] Primary silencer 100 initial screening: Outdoor natural wind carries noise into the top of the system. The airflow first impacts the primary silencer 100, and the high-frequency noise is initially weakened by the plate silencer box 340. Some sound energy is absorbed, and the airflow noise is initially reduced.

[0052] The first sound-absorbing panel 200 provides deep absorption: After initial noise reduction, the airflow enters the structure of the first sound-absorbing panel 200 inside the wall. The sound-absorbing cotton inside the first sound-absorbing panel 200 attenuates low and medium frequency noise in a targeted manner. The sound waves are reflected and dissipated in the multi-layer microporous structure, and the airflow turbulence noise is greatly reduced.

[0053] Secondary silencer 300 reinforcement treatment: The airflow treated by the first sound-absorbing plate 200 enters the secondary silencer 300, and the residual noise is intercepted again by the plate silencer box 340. Especially for low-frequency sound waves with strong penetration, the noise energy is weakened a second time, and the airflow tends to be stable.

[0054] Second sound-absorbing panel 400 end purification: The airflow about to enter the room passes through the second sound-absorbing panel 400, and the end sound-absorbing cotton performs the final filtration of residual noise. At the same time, the structure of the second sound-absorbing panel 400 buffers the airflow pressure, suppresses regenerated noise, and clean and quiet air enters the room.

[0055] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] The above-described embodiments are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the appended claims.

Claims

1. A compound multi-stage muffler structure, characterized by comprising: include: Primary silencer; The first sound-absorbing plate is perpendicular to the first-stage silencer and is fixed to the upper end of the first-stage silencer; The secondary muffler is perpendicular to the primary muffler and is fixed at the lower end of the primary muffler; The second sound-absorbing plate is symmetrically distributed on both sides of the first-stage silencer, with one end of it fixedly connected to the end of the first sound-absorbing plate and the other end of it fixedly connected to the end of the second-stage silencer. The primary and secondary silencers each include a cover plate, a side plate, a bottom plate, and a sheet-type silencer box. The side plate is fixed between the cover plate and the bottom plate. The cover plate has evenly distributed air inlet slots, and the bottom plate has evenly distributed air outlet slots. The sheet-type silencer box is located between adjacent air inlet slots. The interior of both the second and first sound-absorbing plates contains sound-absorbing cotton.

2. The compound multi-stage muffler structure according to claim 1, wherein The primary silencer is fixed between the first sound-absorbing plate and the secondary silencer, and the air inlet slot on the secondary silencer is located on the side close to the air outlet slot on the primary silencer.

3. The composite multi-stage silencer structure according to claim 2, characterized in that, The first sound-absorbing panel, the second sound-absorbing panel, the secondary silencer, and the inner window combine to form a sound-absorbing channel.

4. The composite multi-stage silencer structure according to claim 3, characterized in that, Both the primary and secondary silencers also include dustproof and insectproof filters, which are located at the air inlet slot.

5. The composite multi-stage silencer structure according to claim 4, characterized in that, The secondary silencer also includes a corner, which is fixed to the side plate, and the bottom of the corner is flush with the bottom plate.

6. The composite multi-stage silencer structure according to claim 5, characterized in that, Each of the air inlet slots corresponds to a set of air outlet slots, and the set of air outlet slots consists of uniformly distributed rectangular slots.

7. The composite multi-stage silencer structure according to any one of claims 1 to 6, characterized in that, The sheet-type sound-absorbing box includes, in sequence along the thickness direction, an upper cover, a composite microporous sound-absorbing panel, a sound-absorbing material layer, a composite microporous sound-absorbing back panel, and a lower cover. Both the upper cover and the lower cover are provided with ventilation slots.

8. The composite multi-stage silencer structure according to claim 7, characterized in that, The sound-absorbing material layer is made of high-density polyester fiber material.

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