Vacuum negative pressure exhaust muffler

Abstract

The utility model belongs to the technical field of silencer, disclose a kind of vacuum negative pressure exhaust muffler.The vacuum negative pressure exhaust muffler includes: shell, intake pipe and exhaust pipe, shell has sound-absorbing cavity, intake pipe and exhaust pipe coaxially set in the length direction of shell both ends, vacuum negative pressure exhaust muffler is also provided with partition, to make sound-absorbing cavity separate into first chamber and second chamber, partition is provided with through-hole, one end of intake pipe is inserted into first chamber, and fixedly connected with plugging plate, the other end of intake pipe is used to connect with external pipeline, intake pipe is spaced apart and arranged with multiple exhaust holes on the side wall in first chamber, exhaust pipe is communicated with second chamber.The vacuum negative pressure exhaust muffler is spaced apart and arranged with multiple exhaust holes on the side wall in first chamber, so that sound wave produces friction and resonance in aperture, consumes sound energy, improves noise reduction effect, simultaneously through exhaust hole and the through-hole on partition, reduce airflow resistance, ensure that air current passes smoothly.

Description

Technical Field

[0001] This utility model relates to the field of silencer technology, and in particular to a vacuum negative pressure exhaust silencer. Background Technology

[0002] In vacuum negative pressure exhaust systems, the high-frequency noise and airflow pulsation carried by the exhaust airflow can interfere with the surrounding environment and equipment. Silencers are key components for reducing this noise. Existing vacuum negative pressure exhaust silencers mostly achieve noise reduction through a single chamber or a simple porous structure. Although they can consume some sound energy through pore friction and resonance, they still have significant shortcomings.

[0003] On the one hand, its noise reduction frequency band is relatively narrow, and its suppression effect on the wide-frequency noise commonly found in vacuum exhaust, especially low-frequency pulsating noise, is limited, making it difficult to meet the noise reduction requirements under complex working conditions; on the other hand, some silencers increase the complexity of the airflow path in order to improve the noise reduction effect, resulting in increased airflow resistance, which can easily lead to poor exhaust, affecting the normal negative pressure operation of the vacuum system, and making it difficult to achieve an efficient balance between noise reduction effect and airflow smoothness.

[0004] Therefore, there is an urgent need for a vacuum negative pressure exhaust silencer to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a vacuum negative pressure exhaust muffler, which has good noise reduction effect and low airflow resistance.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A vacuum negative pressure exhaust muffler is provided, comprising: a housing, an inlet pipe, and an exhaust pipe. The housing has a silencing cavity. The inlet pipe and the exhaust pipe are coaxially arranged at both ends of the housing along its length. The vacuum negative pressure exhaust muffler is also provided with a partition plate to divide the silencing cavity into a first chamber and a second chamber. The partition plate is provided with a through hole. One end of the inlet pipe extends into the first chamber and is fixedly connected to a sealing plate. The other end of the inlet pipe is used to connect to an external pipe. Multiple exhaust holes are spaced apart on the side wall of the inlet pipe within the first chamber. The exhaust pipe communicates with the second chamber.

[0008] Preferably, the multiple exhaust holes are arranged in a matrix.

[0009] Preferably, the vacuum negative pressure exhaust muffler also includes an inner plate coaxially disposed in the muffler cavity, and the inner plate is disposed parallel to and spaced apart from the inner peripheral wall of the housing, and a plurality of perforations are spaced apart on the inner plate.

[0010] Preferably, a fixing bracket is fixedly connected between the inner panel and the inner peripheral wall of the shell.

[0011] Preferably, noise-reducing material is filled between the inner panel and the inner peripheral wall of the housing.

[0012] Preferably, a moisture-proof layer is provided between the inner panel and the inner peripheral wall of the shell, and the moisture-proof layer is wrapped around the noise-reducing material.

[0013] Preferably, the through holes on the partition plate are square holes.

[0014] Preferably, a sound-absorbing plate is fixedly connected to the second chamber.

[0015] Preferably, the end of the intake pipe used for connecting to an external pipe is provided with a connecting flange.

[0016] Preferably, the vacuum negative pressure exhaust muffler is made of stainless steel.

[0017] The beneficial effects of this utility model are as follows:

[0018] A vacuum negative pressure exhaust silencer is provided, comprising: a housing, an inlet pipe, an exhaust pipe, and a partition plate. The housing has a silencing cavity. The inlet pipe and the exhaust pipe are coaxially arranged at both ends along the length of the housing. The silencing cavity is divided into a first chamber and a second chamber by the partition plate, which has through holes. One end of the inlet pipe extends into the first chamber and is fixedly connected to a sealing plate. The other end of the inlet pipe is used to connect to an external pipe. Multiple exhaust holes are spaced apart on the side wall of the inlet pipe within the first chamber. The exhaust pipe communicates with the second chamber. Because the end of the inlet pipe extending into the first chamber is sealed by the sealing plate, and multiple exhaust holes are spaced apart on the side wall of the inlet pipe within the first chamber, vacuum negative pressure gas is discharged through these holes. When the vacuum negative pressure gas is discharged from the holes around the pipe, sound waves can generate friction and resonance in the pores, consuming sound energy and achieving noise reduction. Simultaneously, the exhaust holes and the through holes on the partition plate reduce airflow resistance and ensure smooth airflow. Attached Figure Description

[0019] Figure 1 This is a first-view structural schematic diagram of the vacuum negative pressure exhaust muffler provided by this utility model;

[0020] Figure 2 This is a second-view structural schematic diagram of the vacuum negative pressure exhaust muffler provided by this utility model;

[0021] Figure 3 This is a third-view structural schematic diagram of the vacuum negative pressure exhaust muffler provided by this utility model;

[0022] Figure 4 This is a fourth-view structural schematic diagram of the vacuum negative pressure exhaust muffler provided by this utility model.

[0023] In the picture:

[0024] 1. Shell;

[0025] 2. Intake pipe; 21. Exhaust port; 22. Sealing plate;

[0026] 3. Exhaust pipe;

[0027] 4. Partition plate; 41. Through hole;

[0028] 5. First chamber; 6. Second chamber;

[0029] 7. Inner panel; 71. Perforation;

[0030] 8. Fixed bracket; 9. Sound-absorbing plate; 10. Connecting flange. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0032] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature 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 includes the first feature 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.

[0034] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0035] Please refer to Figures 1 to 4 This embodiment provides a vacuum negative pressure exhaust silencer, including: a housing 1, an inlet pipe 2 and an exhaust pipe 3. The housing 1 has a silencing cavity. The inlet pipe 2 and the exhaust pipe 3 are coaxially arranged at both ends of the length direction of the housing 1. The vacuum negative pressure exhaust silencer is also provided with a partition plate 4 to divide the silencing cavity into a first chamber 5 and a second chamber 6. The partition plate 4 is provided with a through hole 41. One end of the inlet pipe 2 extends into the first chamber 5 and is fixedly connected with a sealing plate 22. The other end of the inlet pipe 2 is used to connect to an external pipe. Multiple exhaust holes 21 are provided at intervals on the side wall of the inlet pipe 2 located in the first chamber 5. The exhaust pipe 3 communicates with the second chamber 6.

[0036] On the one hand, the silencing cavity is divided into a first chamber and a second chamber 6 by the partition plate 4, forming a "dual-stage noise reduction" structure. The airflow first enters the first chamber 5 through multiple exhaust holes 21 on the side wall of the intake pipe 2. The friction of the hole wall and the resonance of the chamber initially consume the sound energy. Then, it enters the second chamber 6 through the through hole 41 of the partition plate 4. The noise is further weakened by the expansion of the chamber and the buffering of the airflow. Compared with the single-chamber structure, the broadband noise reduction effect is more significant, especially in optimizing the ability to suppress low-frequency pulsating noise. On the other hand, the design of multiple exhaust holes 21 on the side wall of the intake pipe 2 can disperse the path of the airflow into the first chamber 5, avoiding local airflow congestion caused by single-hole intake. The through hole 41 of the partition plate 4 is coaxially arranged with the intake pipe 2 and the exhaust pipe 3, which can guide the airflow to flow smoothly along the length of the shell 1, reduce the detour loss of the airflow in the chamber, and effectively reduce the overall airflow resistance while improving the noise reduction effect, avoiding the negative pressure loss of the vacuum system caused by the muffler, and ensuring exhaust efficiency and stable system operation.

[0037] Preferably, please refer to Figures 1 to 3 Multiple exhaust vents 21 are arranged in a matrix. This arrangement ensures that the spacing and diameter of each exhaust vent 21 are consistent, resulting in more uniform dissipation of frictional sound energy and resonant frequency when airflow passes through each exhaust vent 21. This avoids problems such as insufficient noise reduction in some areas and excessive throttling in others due to random vent placement. At the same time, the uniformly flowing airflow can make more thorough contact with the noise reduction material in the first chamber 5, allowing sound energy to be absorbed evenly within the chamber and improving the stability of broadband noise suppression.

[0038] Specifically, the shell 1 is a cylindrical structure with a length of 2440 mm and a diameter of 1000 mm, and the wall thickness of the shell 1 is 4 mm. The partition plate 4 and the sealing plate 22 of the exhaust pipe 3 are made of 4 mm thick stainless steel plate. The multiple exhaust holes 21 have a hole spacing of 32 mm along the length of the exhaust pipe 3 and a hole spacing of 35 mm perpendicular to the length of the exhaust pipe 3. The diameter of each exhaust hole 21 is 20 mm. The arrangement of the circular chamber and multiple exhaust holes 21 causes the sound waves to interfere and cancel each other out during propagation, further reducing noise.

[0039] Alternatively, please refer to Figure 1 The vacuum negative pressure exhaust silencer also includes an inner panel 7 disposed within the silencer cavity, and the inner panel 7 is disposed parallel to and spaced apart from the inner peripheral wall of the housing 1. The inner panel 7 is provided with a plurality of perforations 71 at intervals. Specifically, the inner panel 7 is a 1mm thick stainless steel perforated plate 71, the perforation diameter of the stainless steel perforated plate 71 is 3mm, and the perforation rate 71 is 25%.

[0040] Furthermore, a noise-reducing material is filled between the inner panel 7 and the inner peripheral wall of the housing 1. In this embodiment, the noise-reducing material is 48K glass wool. In other embodiments, the noise-reducing material may also be mineral wool, open-cell polyurethane foam, or other materials.

[0041] This configuration creates a cavity between the inner panel 7 and the housing 1, facilitating the filling of noise-reducing material. Combined with the multiple perforations 71 on the inner panel 7, this forms a composite noise-reducing structure where the perforated plate, sound-absorbing layer, and housing 1 work together. On one hand, sound waves carried by the airflow pass through the perforations 71, experiencing friction, reflection, and resonance at the opening, initially consuming sound energy. On the other hand, sound waves that are not completely attenuated enter the cavity between the inner panel 7 and the housing 1 and are further absorbed by the noise-reducing material within, enhancing the noise reduction effect of the vacuum negative pressure exhaust muffler.

[0042] Further, please refer to Figure 4 A fixed bracket 8 is fixedly connected between the inner panel 7 and the inner peripheral wall of the housing 1. Specifically, the fixed bracket 8 is a 2mm thick stainless steel U-shaped structure, which has stronger bending resistance and load-bearing capacity compared to a flat plate bracket. The two sides of the U-shaped structure are tightly welded and fixed to the inner peripheral wall of the housing 1 and the inner panel 7, respectively, forming a "two-way support". This can effectively disperse the stress generated by the airflow impact and pressure change of the inner panel 7 under vacuum negative pressure conditions, prevent the inner panel 7 from shifting, deforming or detaching from the housing 1, and ensure that the inner panel 7 and the housing 1 always maintain a parallel and spaced design state, thus ensuring the structural stability of the vacuum negative pressure exhaust muffler.

[0043] Optionally, a moisture-proof layer is also provided between the inner panel 7 and the inner peripheral wall of the shell 1, and the moisture-proof layer covers the noise reduction material. By covering the noise reduction material with the moisture-proof layer, it can directly prevent condensate or external moisture that may be generated during the operation of the vacuum negative pressure exhaust silencer from penetrating into the interior of the noise reduction material, avoiding the attenuation of sound absorption capacity of glass wool due to water absorption and clumping and decreased fluffiness, and ensuring that it maintains its high-efficiency noise reduction performance for a long time.

[0044] In this embodiment, the moisture-proof layer is 140g of hydrophobic fiberglass cloth. The 140g weight ensures the density of the fabric, effectively blocking moisture, while also providing a certain degree of breathability, so as not to hinder sound waves from entering the noise reduction material, thus balancing moisture-proof and acoustic functions.

[0045] Furthermore, a drain outlet is provided at one end of the housing 1 near the exhaust pipe 3 to facilitate the discharge of condensate or moisture, thereby preventing the glass wool from absorbing water and clumping together, reducing its fluffiness and causing a decrease in its sound absorption capacity, and ensuring that it maintains its high-efficiency noise reduction performance over a long period of time.

[0046] Preferably, the through hole 41 on the partition plate 4 is a square hole. This design allows for several advantages. First, the corners of the square hole will cause more reflection and refraction of sound waves in multiple directions, more effectively disrupting the propagation direction of airflow and sound waves compared to a circular hole, thus extending the propagation path of sound waves inside the silencer. Second, the square hole can be directly formed on the partition plate 4 through laser cutting or stamping, resulting in smooth edges and easily controllable precision. Specifically, the size of the square hole is 300mm*300mm.

[0047] Further, please refer to Figures 1-4 A silencer plate 9 is fixedly connected inside the second chamber 6. Specifically, the silencer plate 9 has a thickness of 300mm. By setting the silencer plate 9 inside the second chamber 6, the airflow after noise reduction in the first chamber 5 enters the second chamber 6 through the through hole 41 of the partition plate 4 from the first chamber 5. The airflow collides with the surface of the silencer plate 9 to further consume the remaining sound energy, thereby strengthening the absorption of high-frequency noise that was not sufficiently suppressed in the first chamber 5 and improving the noise reduction effect of the vacuum negative pressure exhaust silencer.

[0048] Alternatively, please refer to Figure 1 The intake pipe 2 is equipped with a connecting flange 10 at one end for connection to an external pipeline. This arrangement facilitates the connection of the intake pipe 2 of the vacuum negative pressure exhaust silencer to an external vacuum negative pressure pipeline, ensuring that vacuum negative pressure gas flows into the silencer cavity.

[0049] Preferably, the vacuum negative pressure exhaust silencer is made of stainless steel. It has high structural strength, strong corrosion resistance, and a long service life.

[0050] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A vacuum negative pressure exhaust silencer, comprising: The device comprises a housing (1), an intake pipe (2), and an exhaust pipe (3). The housing (1) has a silencing cavity. The intake pipe (2) and the exhaust pipe (3) are coaxially arranged at both ends of the housing (1) along its length. The vacuum negative pressure exhaust silencer is further provided with a partition plate (4) to divide the silencing cavity into a first chamber (5) and a second chamber (6). The partition plate (4) is provided with a through hole (41). One end of the intake pipe (2) extends into the first chamber (5) and is fixedly connected with a sealing plate (22). The other end of the intake pipe (2) is used to connect to an external pipe. The intake pipe (2) has multiple exhaust holes (21) spaced apart on the side wall of the first chamber (5). The exhaust pipe (3) communicates with the second chamber (6).

2. The vacuum negative pressure exhaust silencer according to claim 1, characterized in that, The multiple exhaust holes (21) are distributed in a matrix.

3. The vacuum negative pressure exhaust silencer according to claim 1, characterized in that, The vacuum negative pressure exhaust silencer also includes an inner plate (7) disposed in the silencer cavity, and the inner plate (7) is disposed parallel to and spaced apart from the inner peripheral wall of the housing (1), and a plurality of punches (71) are spaced apart on the inner plate (7).

4. The vacuum negative pressure exhaust silencer according to claim 3, characterized in that, A fixing bracket (8) is fixedly connected between the inner panel (7) and the inner peripheral wall of the shell (1).

5. The vacuum negative pressure exhaust silencer according to claim 4, characterized in that, Noise-reducing material is filled between the inner panel (7) and the inner peripheral wall of the shell (1).

6. The vacuum negative pressure exhaust silencer according to claim 5, characterized in that, A moisture-proof layer is also provided between the inner surface plate (7) and the inner peripheral wall of the shell (1), and the moisture-proof layer covers the noise reduction material.

7. The vacuum negative pressure exhaust silencer according to claim 1, characterized in that, The through hole (41) on the partition plate (4) is a square hole.

8. The vacuum negative pressure exhaust silencer according to claim 1, characterized in that, A sound-absorbing plate (9) is fixedly connected inside the second chamber (6).

9. The vacuum negative pressure exhaust silencer according to claim 1, characterized in that, The intake pipe (2) is provided with a connecting flange (10) at one end for connecting to an external pipe.

10. The vacuum negative pressure exhaust silencer according to any one of claims 1-9, characterized in that, The vacuum negative pressure exhaust silencer is made of stainless steel.

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