CN218729885U - Passive noise control system of limited space ventilation fan - Google Patents

Abstract

The application belongs to the technical field of noise control of aircraft ventilation fans, and relates to a passive noise control system of a ventilation fan in a limited space, which comprises a fan ventilation pipeline and a ventilation fan; the composite silencer is arranged on the fan ventilation pipeline corresponding to the downstream of the ventilation fan, one group or a plurality of groups of composite silencers can be arranged along the axial direction of the fan ventilation pipeline and are used for reducing the pneumatic noise of the fan, and the vibration absorber is arranged on the outer wall of the ventilation fan corresponding to the position of the ventilation fan and can reduce the vibration of the ventilation fan during working; the pneumatic noise and the vibration noise of the ventilation fan during working are respectively reduced by the composite muffler and the shock absorber, so that the pneumatic noise and the vibration noise entering the tail end of the ventilation pipeline of the fan are effectively reduced. Meanwhile, the composite muffler and the shock absorber are small in size, the noise control of the ventilation fan under the limit of the limited space of the airplane is simple and easy to realize, the effect is obvious, and the composite muffler and the shock absorber are both integrated, so that the mounting is convenient.

Description

A Passive Noise Control System for Ventilation Fans in Confined Spaces

technical field

The application belongs to the technical field of aircraft ventilation fan noise control, and in particular relates to a passive noise control system for a ventilation fan in a limited space.

Background technique

Aircraft ventilation fans provide cooling ventilation for high heat-loaded electronic equipment requiring forced air on board. The ventilation fan works at high speed and high pressure ratio, causing serious aerodynamic noise and vibration noise, which interferes with the normal work of personnel in nearby cabins and makes them feel uncomfortable. Limited by space and weight constraints on the aircraft, it is impossible to reduce the impact of fan noise on the cabin by adopting a large-scale noise isolation device.

Therefore, how to effectively reduce the noise of the ventilation fan during work is a problem that needs to be solved.

Contents of the invention

The purpose of this application is to provide a passive noise control system for a ventilation fan in a limited space, so as to solve the problem of high noise when the ventilation fan is working in the prior art.

The technical solution of the present application is: a passive noise control system for a ventilation fan in a limited space, including a fan ventilation pipeline and a ventilation fan, the ventilation fan is arranged in the fan ventilation pipeline, and the fan ventilation pipeline corresponds to the downstream of the ventilation fan A composite muffler is provided, and a shock absorber is provided at a position corresponding to the ventilation fan on the outer wall of the ventilation fan.

Preferably, the composite muffler includes a perforated plate, a porous sound-absorbing material and a sound-impermeable bottom plate; the perforated plate corresponds to the same diameter as the fan ventilation pipeline and the perforated plate is coaxially connected with the fan ventilation pipeline, and the sound-impermeable The bottom plate is arranged coaxially outside the perforated plate, and the porous sound-absorbing material is filled between the perforated plate and the porous sound-absorbing material.

Preferably, a muffler elbow is provided at the outlet of the composite muffler, the muffler elbow is arranged at the rear end of the perforated plate and the muffler elbow is coaxially arranged in the middle of the fan ventilation pipeline, and the muffler bend The outer surface of the head is an arc surface, and there is a space between the noise-absorbing elbow and the perforated plate.

A passive noise control system for a ventilation fan in a limited space of the present application includes a fan ventilation pipeline and a ventilation fan; the fan ventilation pipeline is provided with a composite muffler corresponding to the downstream of the ventilation fan, and a group of composite mufflers can be arranged along the axial direction of the fan ventilation pipeline or multiple groups, used to reduce the aerodynamic noise of the fan. A shock absorber is set on the outer wall of the ventilation fan corresponding to the position of the ventilation fan, which can reduce the vibration of the ventilation fan during operation; the aerodynamic noise and vibration noise of the ventilation fan during operation are respectively determined by Composite mufflers and shock absorbers are used to reduce, so that the aerodynamic noise and vibration noise entering the end of the fan ventilation pipe are effectively reduced. At the same time, the size occupied by the composite muffler and the shock absorber is small, and the noise control of the ventilation fan under the limited space of the aircraft is simple and easy to implement and the effect is remarkable, and since the composite muffler and the shock absorber are both integral parts, the installation is convenient.

Description of drawings

In order to illustrate the technical solutions provided by the present application more clearly, the accompanying drawings will be briefly introduced below. Apparently, the drawings described below are only some embodiments of the present application.

Fig. 1 is a schematic diagram of the overall structure of the application;

Fig. 2 is a structural schematic diagram of the composite muffler of the present application.

1. Fan ventilation pipeline; 2. Ventilation fan; 3. Composite muffler; 4. Shock absorber; 5. Perforated plate; 6. Porous sound-absorbing material;

Detailed ways

In order to make the purpose, technical solution and advantages of the application more clear, the technical solution in the embodiment of the application will be described in more detail below in conjunction with the drawings in the embodiment of the application.

A passive noise control system for a ventilation fan in a limited space, as shown in FIG. 1 , includes a fan ventilation pipeline 1 and a ventilation fan 2 . The ventilation fan 2 is arranged in the fan ventilation pipeline 1, and the fan ventilation pipeline 1 and the ventilation fan 2 are conventional designs in the field, and details are not repeated here.

The fan ventilation pipeline 1 is provided with a composite muffler 3 corresponding to the downstream of the ventilation fan 2. One or more groups of composite mufflers 3 can be arranged along the axial direction of the fan ventilation duct to reduce the aerodynamic noise of the fan. The outer wall of the ventilation fan 2 corresponds to the ventilation The position of the fan 2 is provided with a shock absorber 4, which can reduce the vibration of the ventilation fan 2 during operation.

The aerodynamic noise and vibration noise of the ventilation fan 2 are respectively reduced by the composite muffler 3 and the shock absorber 4 during operation, so that the aerodynamic noise and vibration noise entering the end of the fan ventilation pipeline 1 are effectively reduced. Simultaneously, the occupied size of composite muffler 3 and shock absorber 4 is all small, and the noise control of ventilation fan 2 is simple and easy to realize and the effect is remarkable under the limitation of limited space of the aircraft, and since composite muffler 3 and shock absorber 4 are all integral parts, Easy to install.

Preferably, the composite muffler 3 includes a perforated plate 5, a porous sound-absorbing material 6 and a sound-impermeable bottom plate 7; the perforated plate 5 corresponds to the same diameter as the fan ventilation pipeline 1 and the perforated plate 5 is coaxially connected with the fan ventilation pipeline, and is impermeable The acoustic floor 7 is coaxially arranged on the outside of the perforated plate 5 , and the porous sound-absorbing material 6 is filled between the perforated plate 5 and the porous sound-absorbing material 6 . The porous sound-absorbing material 6 can convert high-frequency sound energy into heat energy through friction for sound attenuation, and the porous sound-absorbing material 6 cooperates with the perforated plate 5 to perform composite sound attenuation, and can effectively absorb vibrations of various frequencies.

Preferably, a muffler elbow 8 is provided at the outlet of the composite muffler 3, and the muffler elbow 8 is supported by the shell part of the composite muffler 3. The muffler elbow 8 is arranged at the rear end of the perforated plate 5 and the muffler elbow 8 are coaxially arranged in the middle of the fan ventilation pipeline 1. The outer surface of the muffler elbow 8 is an arc surface, and the arc surface faces the direction of the air flow. There is a gap between the muffler elbow 8 and the perforated plate 5. The position is the shell opening of the compound muffler 3 , and there are multiple groups of shell openings arranged along the circumferential direction of the compound muffler 3 . The muffler elbow 8 is an elbow lined with sound-absorbing material, which has a significant attenuation effect on sound waves. When the length of the composite muffler 3 is limited, it is equivalent to increasing the length of the muffler channel, increasing the aerodynamic noise muffler twice, and realizing The purpose of efficiently reducing the aerodynamic noise of the low-ventilation fan; at the same time, the position of the muffler elbow 8 is in the middle of the fan ventilation pipeline 1, so that the airflow can be turned, thereby consuming sound energy and improving the muffler effect. The above is only a specific embodiment of the application, but the scope of protection of the application is not limited thereto. Any person familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the application. All should be covered within the scope of protection of this application. Therefore, the protection scope of the present application should be determined by the protection scope of the claims.

Claims (3)

1. The utility model provides a passive noise control system of limited space ventilation fan, includes fan ventilation pipeline (1) and ventilation fan (2), ventilation fan (2) are located in fan ventilation pipeline (1), its characterized in that: the fan ventilation pipeline (1) is provided with a composite muffler (3) corresponding to the downstream of the ventilation fan (2), and a vibration absorber (4) is arranged on the outer wall of the ventilation fan (2) at a position corresponding to the ventilation fan (2).

2. The confined space ventilating fan passive noise control system as claimed in claim 1 wherein: the composite muffler (3) comprises a perforated plate (5), a porous sound absorption material (6) and an opaque bottom plate (7); perforated plate (5) correspond the same and perforated plate (5) and fan ventilation pipe coaxial coupling with the diameter of fan ventilation pipeline (1), the outside of perforated plate (5) is located to imperceptible bottom plate (7) coaxial, porous sound absorbent (6) are filled between perforated plate (5) and porous sound absorbent (6).

3. The confined space ventilating fan passive noise control system as claimed in claim 1 wherein: the composite muffler is characterized in that a silencing elbow (8) is arranged at the outlet of the composite muffler (3), the silencing elbow (8) is arranged at the rear end of the perforated plate (5), the silencing elbow (8) is coaxially arranged in the middle of the fan ventilation pipeline (1), the outer surface of the silencing elbow (8) is an arc surface, and an interval is arranged between the silencing elbow (8) and the perforated plate (5).

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