Vacuum generating device muffler

Abstract

The utility model discloses a vacuum generating equipment silencer, it includes main casing and sets up in the main casing's silencer unit and the sound absorption cotton piece, be equipped with a plurality of openings on the shell wall of main casing, the silencer unit includes tracheal joint, silencer cylinder, inside sound absorption cotton and outside sound absorption cotton. The utility model discloses reasonable in structure design, through the trachea connects tracheal joint with vacuum generating equipment, and the gas produced when vacuum generating equipment works enters silencer cylinder, first through the inside sound absorption cotton of porous structure and carries out the friction silencing, then is shunted through the air hole of silencer cylinder, then again by the outside sound absorption cotton of porous structure and sound absorption cotton piece carries out the friction silencing, finally discharges through the opening of main casing, passes through the silencing processing of multilayer structure, can significantly reduce the noise, and sound absorption cotton piece fills the main casing interior space, greatly inhibited the possibility of internal sound wave reflection and cavity resonance, avoided the new noise source of producing, and the sound absorption effect is good.

Description

Technical Field

[0001] This utility model relates to the field of silencer technology, specifically to a noise reduction device for vacuum generating equipment. Background Technology

[0002] Vacuum generating equipment (such as vacuum generators and vacuum pumps) is widely used in modern industrial automated production lines, packaging machinery, electronic semiconductor equipment, and medical devices to quickly establish or disrupt negative pressure environments within vacuum chambers. Their working principle generally involves compressing air through a venturi tube or rotating mechanical structure to generate a high-speed airflow, thereby creating negative pressure at the outlet side. However, when this high-speed airflow is released to the atmosphere through the exhaust channel, it generates high-intensity, broadband aerodynamic noise due to severe turbulence, pressure surges, and airflow shearing. This noise not only deteriorates the working environment and affects the physical and mental health of operators but may also violate increasingly stringent industrial noise regulations and interfere with precision operations requiring a quiet environment.

[0003] To reduce the noise generated by vacuum generating equipment, existing technologies typically employ some noise reduction measures. A common approach is to install a simple metal or plastic casing on the exhaust channel of the vacuum generating equipment. While this casing can isolate and reflect some noise to a certain extent, the noise reduction effect is limited, and the casing itself may resonate due to internal sound wave reflection or create new noise sources. Utility Model Content

[0004] To address the aforementioned shortcomings, the purpose of this utility model is to provide a vacuum generator noise reducer with a reasonable structural design and good noise reduction effect.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0006] A noise reduction device for a vacuum generating equipment includes a main housing and a noise reduction unit and a sound-absorbing cotton block disposed within the main housing. The main housing has several openings on its shell wall. The noise reduction unit includes an air pipe connector, a noise reduction cylinder, inner sound-absorbing cotton, and outer sound-absorbing cotton. The noise reduction cylinder has several air holes on its cylinder wall. The air pipe connector is disposed on the noise reduction cylinder and extends out of the main housing. The inner sound-absorbing cotton is disposed on the inner wall of the noise reduction cylinder, and the outer sound-absorbing cotton covers the outer wall of the noise reduction cylinder.

[0007] As a preferred embodiment of this utility model, the main housing includes a bottom cover, a middle shell, and a top cover. The bottom cover is disposed at the bottom end of the middle shell, and the top cover is disposed at the top end of the middle shell. The openings are evenly distributed on the bottom cover and the middle shell, and the top cover is provided with a through hole for the air pipe connector to extend out, which facilitates installation.

[0008] As a preferred embodiment of this utility model, the top of the middle shell is provided with an upper corner seat, and the top cover is fixed to the upper corner seat by screws. The bottom of the middle shell is provided with a lower corner seat, and the bottom cover is fixed to the lower corner seat by screws, which ensures that the top cover and bottom cover are tightly connected to the middle shell, and also facilitates disassembly for internal cleaning or replacement of sound-absorbing cotton.

[0009] As a preferred embodiment of this utility model, the shape of the sound-absorbing cotton block is adapted to the inner cavity of the main shell, and the sound-absorbing cotton block is provided with an assembly cavity for installing the sound-absorbing unit. The sound-absorbing cotton block is not only a sound absorber, but also serves as a support and positioning structure.

[0010] In a preferred embodiment of this utility model, the silencer includes a cover and a body. The cover is positioned on the body and has mounting holes adapted to the air pipe connector. The cover and body are detachable, facilitating the installation and replacement of the inner sound-absorbing cotton and the cleaning of the inside of the body.

[0011] As a preferred embodiment of this utility model, the bottom surface of the main housing is provided with foot pads to increase the stability of placement.

[0012] As a preferred embodiment of this utility model, the sound-absorbing cotton block, the inner sound-absorbing cotton and the outer sound-absorbing cotton are all made of polyester sound-absorbing cotton, which has good mid-to-high frequency sound absorption performance, and is environmentally friendly, weather-resistant, flame-retardant and not easy to pulverize.

[0013] The beneficial effects of this utility model are as follows: The structure of this utility model is reasonably designed. The air pipe connector is connected to the vacuum generating equipment through the air pipe. When the vacuum generating equipment is working, the gas generated enters the silencer. First, it is punctured by friction through the inner sound-absorbing cotton of the porous structure. Then, it is diverted through the air holes of the silencer. Next, it is punctured by friction through the outer sound-absorbing cotton and sound-absorbing cotton blocks of the porous structure. Finally, it is discharged through the opening of the main shell. After the puncture treatment of the multi-layer structure, the noise can be significantly reduced. Moreover, the sound-absorbing cotton blocks fill the internal space of the main shell, which greatly suppresses the possibility of internal sound wave reflection and cavity resonance, avoids the generation of new noise sources, and has a good puncture effect.

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0016] Figure 2 This is an exploded structural diagram of the present invention.

[0017] Figure 3 This is an exploded structural diagram of the noise reduction unit in this utility model. Detailed Implementation

[0018] See Figure 1 , Figure 2 and Figure 3 This embodiment provides a vacuum generating device noise reduction device, which includes a main housing 1 and a noise reduction unit 2 and a noise reduction cotton block 3 disposed in the main housing 1. The shape of the noise reduction cotton block 3 is adapted to the inner cavity of the main housing 1. The noise reduction cotton block 3 is provided with an assembly cavity 31 for installing the noise reduction unit 2. The noise reduction cotton block 3 is not only a sound absorber, but also serves as a support and positioning structure.

[0019] The main housing 1 has several openings 10 on its shell wall. (See also...) Figure 2 The main housing 1 includes a bottom cover 11, a middle housing 12, and a top cover 13, all preferably made of stainless steel. The bottom cover 11 is located at the bottom of the middle housing 12; specifically, a lower corner seat 14 is provided at the bottom of the middle housing 12, and the bottom cover 11 is fixed to the lower corner seat 14 with screws. The top cover 13 is located at the top of the middle housing 12; specifically, an upper corner seat 15 is provided at the top of the middle housing 12, and the top cover 13 is fixed to the upper corner seat 15 with screws. By unscrewing the screws on the upper corner seat 15, it is easy to disassemble and clean the inside of the main housing 1 or replace the sound-absorbing cotton block 3. The openings 10 are evenly distributed on the bottom cover 11 and the middle housing 12, and the top cover 13 has a through hole 16 for the air pipe connector 21 to extend out, facilitating installation. Preferably, a foot pad 4 is provided on the bottom surface of the bottom cover 11 to further improve placement stability.

[0020] The silencing unit 2 includes an air pipe connector 21, a silencing cylinder 22, inner sound-absorbing cotton 23, and outer sound-absorbing cotton 24. The silencing cylinder 22 has several air holes 20 on its wall. The air pipe connector 21 is located on the silencing cylinder 22 and extends out of the main housing 1. Specifically, it extends from the through hole 16 of the top cover 13. The inner sound-absorbing cotton 23 is located on the inner wall of the silencing cylinder 22, and the outer sound-absorbing cotton 24 covers the outer wall of the silencing cylinder 22. Preferably, the sound-absorbing cotton block 3, the inner sound-absorbing cotton 23, and the outer sound-absorbing cotton 24 are all made of polyester sound-absorbing cotton. Polyester sound-absorbing cotton is a high-performance porous sound-absorbing material. Its fiber structure forms a large number of interconnected micropores. When sound waves are incident, air vibrates and rubs within the micropores, consuming sound energy. It has good mid-to-high frequency sound absorption performance and is environmentally friendly, weather-resistant, flame-retardant, and not easily pulverized.

[0021] See Figure 3The silencer 22 includes a cover 221 and a body 222, both preferably made of aluminum alloy. The cover 221 covers the body 222 and has mounting holes adapted to the air pipe connector 21. The cover 221 and body 222 are detachable, facilitating the installation and replacement of the inner sound-absorbing cotton 23 and the cleaning of the inside of the body 222.

[0022] During operation, the exhaust channel of the vacuum generator is connected to the air supply via an air pipe and air pipe connector 21. The high-speed airflow generated by the vacuum generator enters the interior of the silencing unit 2. The high-speed airflow first impacts and flows through the inner sound-absorbing cotton 23. The sound waves enter the porous inner sound-absorbing cotton 23 and are absorbed for the first time through friction and viscous loss. At the same time, the airflow velocity decreases slightly.

[0023] The airflow then passes through the vents 20 on the silencer 22. This process disperses the concentrated, potentially intense turbulence and noise from a single high-speed airflow into multiple smaller airflows. This dispersion effectively reduces airflow velocity and turbulence intensity, significantly weakening the source of noise generation.

[0024] The airflow from the vent 20 immediately enters the outer sound-absorbing cotton 24, where the dispersed airflow noise is numbed by friction for a second time.

[0025] The airflow, after being treated by the outer sound-absorbing cotton 24, diffuses into the inner cavity of the main shell 1, making large-area contact with the sound-absorbing cotton blocks 3 filling the space. The sound-absorbing cotton blocks 3 provide a third, more thorough sound absorption process, absorbing residual sound energy.

[0026] Finally, the gas, after undergoing multiple noise reduction processes, is smoothly discharged into the atmosphere through the opening 10 of the main casing 1. At the same time, the evenly distributed openings 10 further disperse the airflow, reduce regenerated noise at the exhaust port, greatly reduce noise, and achieve a good noise reduction effect.

[0027] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to this utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model. Other devices that are the same as or similar to these devices are all within the protection scope of this utility model.

Claims

1. A noise reduction device for a vacuum generating device, comprising a main housing, characterized in that, It also includes a silencing unit and a sound-absorbing cotton block disposed within the main housing; the shell wall of the main housing is provided with several openings, the silencing unit includes an air pipe connector, a silencing cylinder, inner sound-absorbing cotton and outer sound-absorbing cotton, the cylinder wall of the silencing cylinder is provided with several air holes, the air pipe connector is disposed on the silencing cylinder and extends out of the main housing, the inner sound-absorbing cotton is disposed on the inner wall of the silencing cylinder, and the outer sound-absorbing cotton covers the outer wall of the silencing cylinder.

2. The noise reduction device for vacuum generating equipment according to claim 1, characterized in that: The main housing includes a bottom cover, a middle shell, and a top cover. The bottom cover is located at the bottom end of the middle shell, and the top cover is located at the top end of the middle shell. The openings are evenly distributed on the bottom cover and the middle shell, and the top cover has a through hole for the tracheal connector to extend out.

3. The noise reduction device for vacuum generating equipment according to claim 2, characterized in that: The top of the middle shell is provided with an upper corner seat, and the top cover is fixed to the upper corner seat by screws. The bottom of the middle shell is provided with a lower corner seat, and the bottom cover is fixed to the lower corner seat by screws.

4. The noise reduction device for vacuum generating equipment according to claim 1, characterized in that: The shape of the sound-absorbing cotton block is adapted to the inner cavity of the main housing, and the sound-absorbing cotton block is provided with an assembly cavity for installing the sound-absorbing unit.

5. The noise reduction device for vacuum generating equipment according to claim 1, characterized in that: The silencer includes a cover and a body. The cover is placed on the body and has mounting holes that are compatible with the air pipe connector.

6. The noise reduction device for vacuum generating equipment according to claim 1, characterized in that: The bottom surface of the main housing is provided with foot pads.

7. The vacuum generating equipment noise reduction device according to any one of claims 1-6, characterized in that: The sound-absorbing cotton block is made of polyester sound-absorbing cotton.

8. The vacuum generating equipment noise reduction device according to any one of claims 1-6, characterized in that: Both the inner and outer sound-absorbing cotton are made of polyester sound-absorbing cotton.

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