A fan with noise reduction function

Abstract

The utility model provides a fan with noise reduction function relates to fan noise reduction technical field, including ventilation pipe still includes the vibration reduction subassembly, and the vibration reduction subassembly includes the soundproofing cotton fixedly connected in the inside of ventilation pipe, the inside fixedly connected with the positioning plate of ventilation pipe, the inside fixedly connected with the inner side plate of one end of ventilation pipe close to the positioning plate, the refraction subassembly, the refraction subassembly includes the refraction board fixedly connected in the inside both ends of ventilation pipe, the inside of refraction board is provided with the resilience angle, the inside of resilience angle is provided with the inner recess, the inside fixedly connected with the ventilation subassembly of ventilation pipe, like this design has realized the stable form of soundproofing cotton under the high speed airflow, suppresses ventilation pipe thin wall resonance, reduces the eccentric vibration of fan blade, thereby effectively solved the secondary structure radiation noise caused by motor and impeller unbalance excitation, from the source controlled mechanical noise, weakened the vibration transmission problem caused by eccentricity.

Description

Technical Field

[0001] This utility model relates to the field of fan noise reduction technology, and in particular to a fan with noise reduction function. Background Technology

[0002] A fan is a fluid transport device that uses a rotating impeller to convert mechanical energy into gas kinetic energy and pressure energy. Driven by a motor, the blades rotate at high speed, causing air or other gases to be continuously drawn in, accelerated and discharged along the axial or radial direction, thereby providing the required air volume and air pressure for ventilation, air conditioning, smoke exhaust, cooling or industrial processes.

[0003] However, during actual operation, some high-speed rotating blades are subjected to severe shearing with the air, and the turbulence and eddy currents inside the casing cause broadband aerodynamic noise. The unbalanced excitation of the motor and impeller is directly transmitted to the installation foundation through the rigid casing and hanger, causing secondary structural radiated noise.

[0004] Therefore, this utility model provides a fan with noise reduction function. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a fan with noise reduction function.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a fan with noise reduction function, including a ventilation pipe and a vibration reduction component, wherein the vibration reduction component includes sound insulation cotton fixedly connected inside the ventilation pipe, a positioning plate is fixedly connected inside the ventilation pipe, and an inner side plate is fixedly connected to one end of the ventilation pipe near the positioning plate.

[0007] A refractive assembly includes sound-reflecting plates fixedly connected to both ends inside the ventilation duct. The sound-reflecting plates have a rebound angle on their inner side and an inner groove inside the rebound angle. A ventilation assembly is fixedly connected inside the ventilation duct.

[0008] In a preferred embodiment, the ventilation assembly includes a mounting base fixedly connected inside the ventilation duct, and a motor is mounted on the outside of the mounting base.

[0009] In a preferred embodiment, the drive end of the motor is fixedly connected to a fan blade.

[0010] In a preferred embodiment, one end of the fan blade is rotatably connected to the positioning plate, and the other end of the fan blade is rotatably connected to the inner side plate.

[0011] In a preferred embodiment, two sound insulation cottons are provided, and the outer ends of the positioning plate and the inner side plate are fixedly connected to the sound insulation cottons.

[0012] As a preferred embodiment, the springback angle is designed to be 45 degrees.

[0013] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0014] 1. By clamping the sound insulation cotton between the positioning plate and the inner side plate, the three components form a damping frame. At the same time, the positioning plate and the inner side plate provide a double-support bearing seat for the fan blade, so that the two ends of the fan blade form a simply supported beam support. This design achieves the benefits of stable sound insulation cotton under high-speed airflow, suppressing thin-wall resonance of the ventilation duct, and reducing eccentric vibration of the fan blade. It effectively solves the problem of secondary structure radiation noise caused by unbalanced excitation of the motor and impeller, controls mechanical noise from the source, and weakens the problem of vibration transmission caused by eccentricity.

[0015] 2. The incident sound wave is reflected to the rebound angle by the 45-degree sound-reflecting plates at both ends, which causes the inner groove and the rebound angle to form a quarter-wavelength resonant cavity. This design achieves the benefits of phase cancellation between the reflected sound wave and the subsequent sound wave, dissipation of sound energy at a specific frequency, and reduction of eddy currents. Attached Figure Description

[0016] Figure 1 A perspective view of a fan with noise reduction function provided by this utility model;

[0017] Figure 2 A schematic diagram of a vibration reduction component structure for a fan with noise reduction function provided by this utility model;

[0018] Figure 3 A schematic diagram of the refractive component structure of a fan with noise reduction function provided by this utility model;

[0019] Figure 4 A schematic diagram of the ventilation component structure of a fan with noise reduction function provided by this utility model;

[0020] Figure 5 This utility model provides a schematic diagram of a mounting base structure for a fan with noise reduction function.

[0021] Legend:

[0022] 1. Ventilation duct;

[0023] 2. Vibration damping components; 21. Sound insulation cotton; 22. Positioning plate; 23. Inner side plate;

[0024] 3. Refraction component; 31. Sound-reflecting plate; 32. Rebound angle; 33. Inner groove;

[0025] 4. Ventilation components; 41. Mounting base; 42. Motor; 43. Fan blades. Detailed Implementation

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

[0027] like Figure 1 , Figure 2 and Figure 4 As shown, this embodiment provides a technical solution: a fan with noise reduction function, including a ventilation pipe 1 and a vibration reduction component 2. The vibration reduction component 2 includes sound insulation cotton 21 fixedly connected inside the ventilation pipe 1. A positioning plate 22 is fixedly connected inside the ventilation pipe 1. An inner side plate 23 is fixedly connected to one end of the ventilation pipe 1 near the positioning plate 22. Two sound insulation cotton 21s are provided. The outer ends of the positioning plate 22 and the inner side plate 23 are fixedly connected to the sound insulation cotton 21.

[0028] The sound insulation cotton 21 directly absorbs the mid-to-high frequency airflow noise generated by the rotation of the fan blade 43; at the same time, it converts the mechanical vibration energy of the motor 42 and the fan blade 43 into heat energy, reducing structural sound transmission. The sound insulation cotton 21 is sandwiched between the positioning plate 22 and the inner side plate 23, suppressing thin-wall resonance and reducing the secondary radiation noise of the ventilation duct 1. The positioning plate 22 and the inner side plate 23 provide a double-support bearing seat for the fan blade 43 to ensure coaxiality and reduce vibration caused by eccentricity. The sound insulation cotton 21 is used as a rigid frame to prevent it from being torn under high-speed airflow.

[0029] like Figure 2 and Figure 3 As shown, the refraction component 3 includes sound-reflecting plates 31 fixedly connected to both ends inside the ventilation pipe 1. The inner side of the sound-reflecting plate 31 is provided with a rebound angle 32, and the inside of the rebound angle 32 is provided with an inner groove 33. The rebound angle 32 is designed to be 45 degrees.

[0030] The sound-reflecting plate 31 uses a 45-degree angle to reflect the incident sound wave to the rebound angle 32, forming phase cancellation with the subsequent sound wave; at the same time, some sound energy is introduced into the inner groove 33, which dissipates energy through multiple reflections, reduces eddy currents, and reduces aerodynamic noise. The rebound angle 32 and the inner groove 33 form a quarter-wavelength resonant cavity, locking sound waves of a specific frequency in the cavity and dissipating them repeatedly; the 45-degree angle design makes the incident angle of the sound ray equal to the reflection angle, maximizing the number of reflections;

[0031] like Figure 4 and Figure 5As shown, a ventilation assembly 4 is fixedly connected inside the ventilation duct 1. The ventilation assembly 4 includes a mounting base 41 fixedly connected inside the ventilation duct 1, and a motor 42 is mounted on the outside of the mounting base 41. A fan blade 43 is fixedly connected to the drive end of the motor 42. One end of the fan blade 43 is rotatably connected to the positioning plate 22, and the other end of the fan blade 43 is rotatably connected to the inner side plate 23.

[0032] Mounting base 41 is used for elastic transition between motor 42 and ventilation pipe 1, blocking the rigid transmission of motor 42 vibration to pipe wall, and providing stable airflow between motor 42 and fan blade 43; the two ends of fan blade 43 are supported on positioning plate 22 and inner side plate 23 respectively, forming a support beam structure to reduce sway.

[0033] Working principle:

[0034] like Figure 1 - Figure 5 As shown:

[0035] In use: First, the motor 42 is energized and rotates, which in turn drives the fan blades 43 to rotate synchronously, thus forming a high-speed and stable airflow within the ventilation duct 1. The airflow impacts the duct wall and fan blades 43, generating mid-to-high frequency aerodynamic noise and mechanical vibration, which in turn drives the sound insulation cotton 21 to absorb sound energy and vibration energy synchronously, achieving the first step of sound and vibration energy attenuation. The sound insulation cotton 21 is clamped between the positioning plate 22 and the inner side plate 23, which in turn drive the positioning plate 22 and the inner side plate 23 to jointly form a damping frame, thus allowing the sound insulation cotton 21 to maintain its shape integrity under high-speed airflow, thereby suppressing the resonance of the thin wall of the ventilation duct 1 and further reducing the secondary radiation noise of the structure. The positioning plate 22 and the inner side plate 23 also provide a double-support bearing seat for the fan blades 43. This causes the fan blades 43 to form simply supported beams at both ends, ensuring that the fan blades 43 and the motor 42 rotate coaxially. This significantly reduces the vibration caused by eccentricity, achieving source control of mechanical noise. The airflow and residual noise continue to travel along the ventilation duct 1, which then causes the 45-degree deflection plates 31 at both ends to reflect the incident sound waves to the rebound angle 32. This allows the reflected sound waves to cancel each other out in phase with the subsequent sound waves, thereby guiding some of the sound energy into the inner groove 33. The inner groove 33 and the rebound angle 32 form a quarter-wavelength resonant cavity, which then causes the sound waves of a specific frequency to be reflected and dissipated multiple times in the cavity. This maximizes the number of reflections and reduces eddies, thereby achieving targeted noise reduction of low and medium frequency noise and simultaneous reduction of aerodynamic noise.

[0036] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A fan with noise reduction function, comprising a ventilation duct (1), characterized in that, It also includes a vibration damping component (2), which includes sound insulation cotton (21) fixedly connected inside the ventilation pipe (1), a positioning plate (22) fixedly connected inside the ventilation pipe (1), and an inner side plate (23) fixedly connected to one end of the ventilation pipe (1) near the positioning plate (22). The refraction component (3) includes sound-reflecting plates (31) fixedly connected to both ends inside the ventilation pipe (1). The sound-reflecting plates (31) have a rebound angle (32) on their inner side and an inner groove (33) inside the rebound angle (32). The ventilation pipe (1) is fixedly connected to a ventilation component (4).

2. A fan with noise reduction function according to claim 1, characterized in that: The ventilation assembly (4) includes a mounting base (41) fixedly connected inside the ventilation duct (1), and a motor (42) is mounted on the outside of the mounting base (41).

3. A fan with noise reduction function according to claim 2, characterized in that: The drive end of the motor (42) is fixedly connected to a fan blade (43).

4. A fan with noise reduction function according to claim 3, characterized in that: One end of the fan blade (43) is rotatably connected to the positioning plate (22), and the other end of the fan blade (43) is rotatably connected to the inner side plate (23).

5. A fan with noise reduction function according to claim 1, characterized in that: Two sound insulation cotton (21) are provided, and the outer ends of the positioning plate (22) and the inner side plate (23) are fixedly connected to the sound insulation cotton (21).

6. A fan with noise reduction function according to claim 1, characterized in that: The springback angle (32) is designed to be 45 degrees.

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