Noise elimination structure suitable for air blower

Abstract

The utility model provides a noise elimination structure suitable for an air blower, and belongs to the technical field of air blowers. Comprising an air blower body, and a silencing assembly is installed at the output end of the air blower body; through the arrangement of the silencing assembly, the flow deflector set guides high-speed airflow exhausted by the air blower to the gradually-shrunk inclined direction, so that the airflow flows in order, disorder and collision are avoided, and noise generated by irregular movement of the airflow is reduced; in a modular silencing unit of the silencing buffer area, the sectional area of a gradually-changed silencing cavity is decreased progressively, so that the flow speed and pressure of airflow in the silencing buffer area are changed, sound waves are continuously reflected, refracted and interfered with the cavity wall, sound wave energy is effectively consumed, the noise intensity is reduced, meanwhile, turbulence and vortex phenomena of the airflow are reduced through the gradually-shrunk silencing cavity, noise is further reduced, and the noise reduction effect is achieved. The flow guide strips conduct secondary guiding on the air flow so that the air flow can be discharged more stably, the sawtooth blocks are arranged in a conical shape, the air flow is disturbed on the microscopic level, and residual noise is dispersed and weakened.

Description

Technical Field

[0001] This utility model relates to the field of blower technology, and in particular to a noise reduction structure suitable for blowers. Background Technology

[0002] According to a search of Chinese patent: CN204755412U, a blower silencing device is disclosed, which includes a silencing body disposed at the air inlet of the blower. The silencing body includes a silencing enclosure connected to the air inlet of the blower. The silencing enclosure includes an outer shell, an inner liner plate and a sandwich layer. The inner liner plate is provided with conductive holes. The outer shell is made of metal sheet. The sandwich layer includes a silencing material layer disposed between the inner liner plate and the outer shell. This blower silencing device has a simple and reasonable structure, good silencing effect, and is made of readily available and inexpensive materials.

[0003] In the industrial production sector, blowers are ubiquitous, serving as auxiliary equipment for large machinery in factory workshops and core drivers for various ventilation systems. In daily life, small blowers inside appliances such as kitchen range hoods and household vacuum cleaners also play a silent role, bringing convenience to people's lives. However, blowers inevitably generate considerable noise during operation.

[0004] Such high-intensity noise has a significant impact on the health of operators. Long-term exposure to high-decibel noise can easily lead to ear problems such as tinnitus and hearing loss, and may even cause a series of health risks such as neurasthenia and insomnia, seriously affecting their work performance and quality of life. At the same time, the noise also causes significant noise pollution to the surrounding environment. In the vicinity of factories, noise interferes with the normal lives of nearby residents. In commercial places, excessive noise destroys the comfortable shopping and office environment and reduces the experience of consumers and employees. Traditional blower silencing structures often have poor silencing effects and still have considerable noise after silencing. Therefore, this application provides a silencing structure suitable for blowers to meet the requirements. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a sound-absorbing structure suitable for blowers, so as to solve the technical problem that traditional blower sound-absorbing structures often have poor sound absorption effect and still have a large amount of noise after sound absorption.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0007] A noise reduction structure for a blower includes a blower body, wherein a noise reduction component is installed at the output end of the blower body.

[0008] The noise reduction assembly includes a flexible soundproof cover, which is detachably connected to the output end of the blower body via a fastening ring. The inner wall of the flexible soundproof cover is provided with:

[0009] A guide vane group, comprising a plurality of inclined guide vanes, each guide vane being inclined in a gradually tapering manner from the side of the blower body away from the output end of the blower body;

[0010] The noise reduction buffer is composed of several modular noise reduction units. Each noise reduction unit has a gradually decreasing noise reduction cavity inside. The gradually decreasing noise reduction cavity is set from the guide vane side to the guide bar side with a decreasing cross-sectional area.

[0011] The flow-guiding enhancement structure includes a flow-guiding strip and an array of sawtooth blocks. The flow-guiding strip extends along the inner wall of the flexible soundproof cover, and the sawtooth blocks are arranged in a conical shape at equal intervals on the surface of the flow-guiding strip.

[0012] Preferably, the fastening ring has at least four mounting holes evenly distributed on it, and bolts passing through the mounting holes are engaged with corresponding screw holes at the output end of the blower body.

[0013] Preferably, the output end of the guide vane group corresponds to the inlet of the gradient silencing cavity of the silencing buffer zone.

[0014] Preferably, a sealing gasket is provided between the output end of the guide vane assembly and the inlet of the gradient silencing cavity of the silencing buffer zone.

[0015] Preferably, the inner wall of the flexible soundproof cover is filled with sound-absorbing felt.

[0016] Preferably, the cone angle of the sawtooth block is 30°-45°, and the axis of the sawtooth block is perpendicular to the axis of the guide strip.

[0017] Preferably, a flange is fixedly provided on the side of the flexible soundproof cover near the guide strip.

[0018] Compared with the prior art, this utility model has at least the following beneficial effects:

[0019] In the above scheme, by setting the silencer components, the guide vane group guides the high-speed airflow discharged by the blower to a gradually narrowing inclined direction, so that the airflow flows in an orderly manner, avoids turbulence and collision, and reduces the noise caused by irregular airflow movement.

[0020] Within the modular silencing unit of the silencing buffer zone, the cross-sectional area of ​​the gradually decreasing silencing cavity changes the airflow velocity and pressure within it. Sound waves continuously reflect, refract, and interfere with the cavity walls, effectively consuming sound wave energy and reducing noise intensity. At the same time, the gradually narrowing silencing cavity reduces airflow turbulence and eddy currents, further reducing noise.

[0021] The guide strip provides secondary guidance to the airflow, making it exit more smoothly. The serrated block is set in a cone shape, which disturbs the airflow at the micro level and disperses and weakens residual noise. Its multiple surfaces at different angles increase sound wave reflection and scattering, improve sound wave absorption efficiency, and further reduce noise. Attached Figure Description

[0022] The accompanying drawings, which form part of this specification, illustrate embodiments of the present disclosure and, together with the specification, further serve to explain the principles of the present disclosure and enable those skilled in the art to implement and use the present disclosure.

[0023] Figure 1 This is a schematic diagram of the overall structure of the noise reduction structure applicable to blowers of this utility model;

[0024] Figure 2 This is a schematic diagram of the flexible soundproof cover, fastening ring, and flange of this utility model;

[0025] Figure 3 This is a schematic diagram of the flow guide plate, the gradient sound-absorbing cavity, and the flow guide strip of this utility model;

[0026] Figure 4 This is a schematic diagram of the flexible soundproof cover, sound-absorbing unit, and gradient sound-absorbing cavity of this utility model;

[0027] Figure 5 This utility model Figure 4 Enlarged view of point A in the middle.

[0028] Figure Labels

[0029] 1. Blower body; 2. Silencing assembly; 201. Flexible soundproof cover; 202. Fastening ring; 203. Guide vane assembly; 204. Silencing unit; 205. Gradient silencing cavity; 206. Guide strip; 207. Serrated block; 3. Flange; 4. Output end; 5. Input end.

[0030] As shown in the figure, specific structures and devices are marked in the figure to clearly illustrate the structure of the embodiments of this utility model. However, this is only for illustrative purposes and is not intended to limit this utility model to the specific structure, device and environment. According to specific needs, those skilled in the art can adjust or modify these devices and environments, and such adjustments or modifications are still included in the scope of the appended claims. Detailed Implementation

[0031] The following is a detailed description of a noise reduction structure for blowers provided by this utility model, with reference to the accompanying drawings and specific embodiments. It should be noted that, to make the embodiments more detailed, the following embodiments are the best and preferred embodiments; those skilled in the art can also use other alternative methods to implement some known technologies; and the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit this utility model.

[0032] like Figures 1-5 As shown, this utility model provides a noise reduction structure suitable for blowers, including a blower body 1 and a flexible soundproof cover 201 made of sound insulation materials such as glass wool, rock wool, and sound-absorbing panels (this application is not limited to these materials). The inner wall of the flexible soundproof cover 201 is filled with sound-absorbing felt, which can absorb sound waves, reduce noise intensity, enhance the noise reduction effect, and work in conjunction with other components to improve the noise reduction performance. It can suppress resonance, change acoustic characteristics, reduce resonance caused by sound wave reflection, and also has heat insulation properties, reducing heat dissipation and maintaining stable ambient temperature. These are conventional methods in the prior art and will not be described in detail here. It has good flexibility and sound insulation performance. A flange 3 is fixedly installed on the side of the flexible soundproof cover 201 near the guide strip 206. The flange 3 is used to transport and connect the gas, after noise reduction treatment, delivered by the blower body 1 to other equipment, enabling effective gas transfer between different devices. It is detachably connected to the output end 4 of the blower body 1 via a fastening ring 202. The fastening ring 202 has at least four mounting holes evenly distributed on it. Bolts passing through the mounting holes engage with the corresponding screw holes on the output end 4 of the blower body 1. During installation, simply align the flexible soundproof cover 201 with the output end 4 of the blower body 1 and then tighten it using the fastening ring 202. It can also be easily disassembled when the internal structure needs to be inspected or repaired. At the same time, the flexible soundproof cover 201 can effectively block noise from propagating outward and reduce the impact of noise on the surrounding environment.

[0033] The guide vane group 203 consists of several inclined guide vanes. These guide vanes are inclined in a gradually narrowing manner from the side of the blower body 1 away from the output end 4. When the high-speed airflow discharged from the blower body 1 enters the silencer assembly 2, the guide vane group 203 plays the role of guiding the airflow direction. The gradually narrowing inclined guide vanes enable the airflow to flow more orderly, avoiding airflow turbulence and collision, thereby reducing the noise generated by irregular airflow movement.

[0034] The guide vane group 203 is a key component in the silencing assembly 2. It consists of several inclined guide vanes. These guide vanes start from the side of the blower body 1 away from the output end 4 and are arranged in a gradually tapering inclined layout. When the high-speed airflow discharged from the blower body 1 enters the silencing assembly 2, the guide vane group 203 immediately plays its core role in guiding the airflow direction. The gradually tapering inclined guide vanes enable the airflow to flow in a more regular and orderly manner, effectively avoiding the turbulent interweaving and collision between airflows. It should be noted that irregular airflow is one of the important sources of noise. The design of the guide vane group 203 precisely blocks the path of noise generation caused by disordered airflow from the source, significantly reducing the probability of noise generation.

[0035] The silencing buffer zone is composed of several modular silencing units 204. Each modular silencing unit 204 has a gradient silencing cavity 205 inside, and the cross-sectional area of ​​the gradient silencing cavity 205 decreases from the guide vane side to the guide strip 206 side. The output end 4 of the guide vane group 203 corresponds to the inlet of the gradient silencing cavity 205 in the silencing buffer zone. A sealing gasket is provided between the output end 4 of the guide vane group 203 and the inlet of the gradient silencing cavity 205 in the silencing buffer zone. The sealing gasket can fill any gaps that may exist between the output end 4 of the guide vane group 203 and the inlet of the gradient silencing cavity 205, preventing air from entering the silencing buffer zone. The flow leaks through these gaps, increasing the seal between the guide vane group 203 and the silencing buffer. When the airflow guided by the guide vane group 203 enters the silencing buffer, the flow velocity of the airflow changes due to the gradual decrease in the cross-sectional area of ​​the gradually decreasing silencing cavity 205. This change in flow velocity causes the sound waves in the airflow to continuously reflect and refract with the wall of the silencing cavity, thereby consuming the energy of the sound waves and achieving the purpose of reducing noise. In addition, the modular design makes the manufacturing and maintenance of the silencing buffer more convenient. If a certain silencing unit 204 is damaged, only that unit needs to be replaced, without replacing the entire silencing buffer.

[0036] The flow-guiding enhancement structure includes a flow-guiding strip 206 and an array of sawtooth blocks 207. The flow-guiding strip 206 extends along the inner wall of the flexible soundproof cover 201, while the sawtooth blocks 207 are arranged in a conical shape at equal intervals on the surface of the flow-guiding strip 206. The cone angle of the conical sawtooth blocks 207 is 30°-45°, and the axis of the sawtooth blocks 207 is perpendicular to the axis of the flow-guiding strip 206. The flow-guiding strip 206 further guides the airflow passing through the noise-absorbing buffer zone, ensuring that the airflow can smoothly pass through the noise-absorbing component 2 and be discharged. On the one hand, the conical shape of the sawtooth blocks 207 can disturb the airflow at the microscopic level, further dispersing and weakening the residual noise in the airflow. On the other hand, the shape of the sawtooth blocks 207 can also increase the contact area between the sound waves and the structural surface, improve the sound wave absorption efficiency, and thus further reduce noise.

[0037] The specific operation and principle of installing and using the blower silencer assembly 2 are as follows:

[0038] First, the flexible soundproof cover 201 is firmly fixed to the output end 4 of the blower body 1 with the fastening ring 202. After installation, the blower body 1 is driven to start running. When the blower body 1 rotates, air is drawn in from its input end 5 and then blown into the flexible soundproof cover 201 from the output end 4. The air blown out from the output end 4 first passes through the guide vane group 203. The guide vanes of the guide vane group 203 are gradually inclined, which can guide the air in an orderly manner to the noise reduction buffer. After the air enters the noise reduction buffer, it will enter the gradual noise reduction cavity 205 in each modular noise reduction unit 204. The cross-sectional area of ​​the gradual noise reduction cavity 205 gradually decreases from the guide vane side to the guide strip 206 side.

[0039] When wind flows through a silencing cavity with a gradually decreasing cross-sectional area, the airflow speed gradually increases, and the pressure changes simultaneously. These changes cause the sound waves to continuously reflect, refract, and interfere with the walls of the silencing cavity during propagation, thereby consuming the energy of the sound waves and effectively reducing the intensity of noise. The gradually narrowing silencing cavity can make the airflow more concentrated and orderly, reducing turbulence and eddies. Turbulence and eddies are important causes of additional noise, so this further reduces noise generation.

[0040] After the air flows out of the silencing cavity, it comes into contact with the guide strip 206. The guide strip 206 extends along the inner wall of the flexible soundproof cover 201. It can constrain and guide the air. When the air comes into contact with the guide strip 206, the guide strip 206 will change the air flow path, which is equivalent to compressing and regulating the air to a certain extent. In this process, the air flow is more stable, and the irregular airflow movement that may exist is suppressed, thereby achieving the silencing effect again. This is because the noise generated by stable airflow is much less than the noise generated by turbulent airflow. The guide strip 206 optimizes the airflow pattern and reduces the noise generated by unstable airflow.

[0041] When wind comes into contact with the cone-shaped, equally spaced sawtooth blocks 207 on the guide strip 206, the cone-shaped sawtooth blocks 207 have multiple surfaces at different angles. When sound waves hit these surfaces, multiple reflections and scattering occur, making the direction of sound wave propagation more complex, thereby increasing the loss of sound wave energy and further reducing noise. The cone-shaped sawtooth blocks 207 can finely disturb the airflow at the microscopic level, decomposing the potentially large-scale turbulence into many small-scale turbulences. The noise generated by small-scale turbulence has a higher frequency, while high-frequency noise is relatively easier to absorb and attenuate. Therefore, this design helps to further reduce noise.

[0042] This utility model encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this utility model. To provide the public with a thorough understanding of this utility model, specific details have been described in detail in the above preferred embodiments; however, those skilled in the art can fully understand this utility model even without these detailed descriptions.

[0043] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A sound absorbing structure for a blower, comprising a blower body (1), characterized in that, The output end (4) of the air blower body (1) is provided with a silencing assembly (2); The silencing assembly (2) comprises a flexible soundproof cover (201), which is detachably connected with the output end (4) of the air blower body (1) through a fastening ring (202), and an inner wall of the flexible soundproof cover (201) is provided with: A guide vane group (203) comprising a plurality of inclined guide vanes, each guide vane being tapered inclined from a side of the air blower body (1) away from the output end (4) of the air blower body (1); A sound attenuation buffer zone composed of a plurality of modular sound attenuation units (204), each sound attenuation unit (204) being provided with a gradually changing sound attenuation cavity (205) inside, the gradually changing sound attenuation cavity (205) being arranged in a decreasing cross-sectional area from the guide vane side to the guide bar (206) side; A guide enhancement structure comprising a guide bar (206) and an array of sawtooth blocks (207), the guide bar (206) being arranged along the inner wall of the flexible soundproof cover (201), and the sawtooth blocks (207) being arranged in a tapered manner on the surface of the guide bar (206).

2. The sound attenuation structure for a blower according to claim 1, characterized in that, The fastening ring (202) is uniformly provided with at least four mounting holes, which are matched with corresponding screw holes of the output end (4) of the air blower body (1) through bolts passing through the mounting holes.

3. The sound attenuation structure for a blower according to claim 1, wherein The output end (4) of the guide vane group (203) corresponds to the inlet of the gradually changing sound attenuation cavity (205) of the sound attenuation buffer zone.

4. The sound attenuation structure for a blower according to claim 1, wherein A sealing gasket is arranged between the output end (4) of the guide vane group (203) and the inlet of the gradually changing sound attenuation cavity (205) of the sound attenuation buffer zone.

5. The sound attenuation structure for a blower according to claim 1, wherein The inner wall of the flexible soundproof cover (201) is filled with sound-absorbing felt.

6. The sound attenuation structure for a blower according to claim 1, wherein The taper angle of the sawtooth block (207) is 30°-45°, and the axis of the sawtooth block (207) is perpendicular to the axis of the guide bar (206).

7. The sound attenuation structure for a blower according to claim 1, wherein The flexible soundproof cover (201) is fixedly provided with a flange (3) on the side close to the guide bar (206).

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