Multi-stage noise reduction flow guide structure of centrifugal fan

Abstract

The utility model relates to the technical field of centrifugal fans, and discloses a multistage noise reduction flow guide structure of a centrifugal fan, which comprises a centrifugal fan main body, the inner wall of the centrifugal fan main body is fixedly connected with sound absorption cotton, one end of the centrifugal fan main body is fixedly connected with a flow guide cylinder, and the inner wall of the flow guide cylinder is fixedly connected with a noise reduction component. A dustproof assembly is arranged at one end of the guide cylinder, the noise reduction assembly comprises a double-layer micro-perforated plate arranged on the inner wall of the guide cylinder, a honeycomb metal guide plate is fixedly connected into the double-layer micro-perforated plate, and the dustproof assembly comprises a mounting plate arranged at one end of the guide cylinder. According to the multi-stage noise reduction flow guide structure of the centrifugal fan, by arranging the sound absorption cotton, the reinforcing layer and the noise reduction assembly, the purpose of multi-stage noise reduction is achieved, the situation that when airflow enters the air inlet, vortexes can be formed, generated airflow turbulence collides with the fan in a large amount, and large noise is generated is avoided, and sound pollution generated by the centrifugal fan can be improved.

Description

A multi-stage noise reduction and flow guiding structure for centrifugal fans Technical Field

[0001] This utility model relates to the field of centrifugal fan technology, and in particular to a multi-stage noise reduction and flow guiding structure for centrifugal fans. Background Technology

[0002] Centrifugal fans are machines that rely on input mechanical energy to increase gas pressure and discharge gas; they are a type of driven fluid machinery. Centrifugal fans are widely used in factories, mines, tunnels, cooling towers, vehicles, ships, and buildings for ventilation, dust removal, and cooling; in boilers and industrial furnaces for ventilation and induced draft; in air conditioning equipment and household appliances for cooling and ventilation; in grain drying and conveying; as wind sources in wind tunnels and for inflating and propelling hovercraft. When a centrifugal fan is running, it generates considerable noise as air enters the fan casing through the inlet.

[0003] Currently, most centrifugal fans are used with a guide duct added to the air inlet. However, this function is relatively simple and not conducive to multi-stage noise reduction. In addition, during the operation of the centrifugal fan, impurities are easily sucked into the air inlet, which can damage the internal structure of the fan and make it difficult to extend the service life of the centrifugal fan. Summary of the Invention

[0004] The purpose of this invention is to provide a multi-stage noise reduction and flow guiding structure for centrifugal fans, thereby solving the problems mentioned in the background art, such as the inconvenience of multi-stage noise reduction and the inconvenience of extending the service life of centrifugal fans.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a multi-stage noise reduction and airflow guiding structure for a centrifugal fan, comprising a centrifugal fan body, sound-absorbing cotton fixedly connected to the inner wall of the centrifugal fan body, an airflow guiding cylinder fixedly connected to one end of the centrifugal fan body, a noise reduction component fixedly connected to the inner wall of the airflow guiding cylinder, and a dustproof component provided at one end of the airflow guiding cylinder.

[0006] The noise reduction component includes a double-layer micro-perforated plate disposed on the inner wall of the guide tube, and a honeycomb metal guide plate is fixedly connected inside the double-layer micro-perforated plate.

[0007] The dustproof component includes a mounting plate disposed at one end of the guide tube, a dustproof filter screen fixedly connected to the middle of the surface of the mounting plate, and a filter microporous membrane glued to the inner wall of the dustproof filter screen.

[0008] As a further embodiment of this utility model, a reinforcing layer is fixedly connected to the bottom wall of the sound-absorbing cotton. The reinforcing layer is made of gradient density aluminum foam. Gradient density aluminum foam helps to protect the sound-absorbing cotton from being stripped by airflow. The gradient density achieves a gradual change in impedance, thereby increasing the sound reduction effect.

[0009] As a further embodiment of this utility model, both the outer periphery of the double-layer micro-perforated plate and the outer periphery of the guide tube are provided with fixing holes, and fixing bolts are threaded into the fixing holes to facilitate fixing the double-layer micro-perforated plate.

[0010] As a further embodiment of this utility model, sealing rubber rings are fixedly connected to the outer periphery of both ends of the double-layer micro-perforated plate. The sealing rubber rings are bonded to the guide tube using sealant. The sealing rubber rings facilitate ensuring that there are no gaps between the double-layer micro-perforated plate and the inner wall of the guide tube.

[0011] As a further embodiment of this utility model, a sealing groove is provided at one end of the guide tube, and a sealing gasket is snapped into the inside of the sealing groove, making it convenient to install the sealing gasket.

[0012] As a further embodiment of this utility model, one end of the sealing gasket is fixedly connected to one side of the mounting plate, and the sealing gasket is made of rubber, which facilitates increased sealing performance.

[0013] As a further embodiment of this utility model, the mounting plate and the guide tube are provided with a plurality of mounting holes on one side, and mounting bolts are inserted through the interior of the mounting holes. The surface of the mounting bolts is threaded with limit caps, and the mounting bolts facilitate the fixing of the mounting plate.

[0014] This utility model provides a multi-stage noise reduction and airflow guiding structure for a centrifugal fan, which has the following beneficial effects:

[0015] 1. The multi-stage noise reduction and airflow guiding structure of this centrifugal fan, through the setting of sound-absorbing cotton, reinforcing layer and noise reduction components, allows the airflow to pass through the double-layer micro-perforated plate and honeycomb metal guide plate when the centrifugal fan is started. The porosity of the honeycomb structure helps to absorb some sound waves, and the double-layer micro-perforated plate increases the path length of the sound waves and can effectively reduce noise through multiple reflections and attenuation. At the same time, the honeycomb metal guide plate evenly distributes the airflow, reducing the non-uniformity of the airflow and allowing it to enter the fan evenly. Meanwhile, the sound-absorbing cotton and reinforcing layer have sound absorption function, which can reduce the noise generated by airflow changes, turbulence or airflow collision with the centrifugal fan shell wall, thereby achieving the purpose of multi-stage noise reduction. This avoids the formation of vortices when the airflow enters the air inlet, which would cause a large amount of airflow to collide with the fan and generate a lot of noise, thus helping to improve the sound pollution generated by the centrifugal fan.

[0016] 2. The centrifugal fan features a multi-stage noise reduction and airflow guiding structure. With the inclusion of dustproof components, when the mounting plate and airflow guide cylinder are connected, and the centrifugal fan is started, the dustproof filter screen blocks larger impurities in the air, while the microporous membrane filters smaller impurities. This effectively prevents impurities and dust from entering the fan's interior, avoiding the risk of impurities being drawn into the air inlet during operation and causing damage to the internal structure of the fan. This helps extend the service life of the centrifugal fan. Attached Figure Description

[0017] Figure 1 is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 is a schematic diagram of the noise reduction component structure of this utility model;

[0019] Figure 3 is a schematic diagram of the sound-absorbing cotton structure of this utility model;

[0020] Figure 4 is a schematic diagram of the dustproof component structure of this utility model.

[0021] In the diagram: 1. Centrifugal fan body; 2. Sound-absorbing cotton; 3. Flow guide tube; 4. Noise reduction component; 401. Double-layer micro-perforated plate; 402. Honeycomb metal flow guide plate; 5. Dustproof component; 501. Mounting plate; 502. Dustproof filter screen; 503. Filter microporous membrane; 6. Reinforcing layer; 7. Fixing bolt; 8. Sealing rubber ring; 9. Sealing groove; 10. Sealing gasket; 11. Mounting bolt; 12. Limiting cap. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0023] Please refer to Figures 1 to 4. This utility model provides a technical solution: a multi-stage noise reduction and airflow guiding structure for a centrifugal fan, including a centrifugal fan body 1, sound-absorbing cotton 2 fixedly connected to the inner wall of the centrifugal fan body 1, an airflow guiding cylinder 3 fixedly connected to one end of the centrifugal fan body 1, a noise reduction component 4 fixedly connected to the inner wall of the airflow guiding cylinder 3, and a dustproof component 5 provided at one end of the airflow guiding cylinder 3.

[0024] The noise reduction component 4 includes a double-layer micro-perforated plate 401 disposed on the inner wall of the guide tube 3. A honeycomb metal guide plate 402 is fixedly connected inside the double-layer micro-perforated plate 401. Through the arrangement of the sound-absorbing cotton 2, the reinforcing layer 6, and the noise reduction component 4, when the centrifugal fan is started, the airflow passes through the double-layer micro-perforated plate 401 and the honeycomb metal guide plate 402. The porosity of the honeycomb structure can help absorb some sound waves. The double-layer micro-perforated plate 401 increases the path length of the sound waves and can effectively reduce noise through multiple reflections and attenuation. The honeycomb metal guide plate 402 distributes the airflow evenly, reducing the non-uniformity of the airflow and allowing it to enter the fan evenly. At the same time, the sound-absorbing cotton 2 and the reinforcing layer 6 have sound-absorbing functions, which can reduce the noise generated by airflow changes, turbulence or airflow collision with the centrifugal fan casing, thereby achieving the purpose of multi-stage noise reduction. This avoids the formation of vortices when the airflow enters the air inlet, which would cause a large amount of airflow to collide with the fan and generate a lot of noise, thus helping to improve the sound pollution generated by the centrifugal fan.

[0025] The dustproof component 5 includes a mounting plate 501 disposed at one end of the guide tube 3. A dustproof filter 502 is fixedly connected to the middle of the surface of the mounting plate 501. A microporous membrane 503 is glued to the inner wall of the dustproof filter 502. With the dustproof component 5, when in use, after connecting the mounting plate 501 to the guide tube 3 and starting the centrifugal fan, the dustproof filter 502 blocks larger impurities in the air, and the microporous membrane 503 filters smaller impurities, thereby effectively preventing impurities and dust from entering the fan. This avoids the centrifugal fan from easily sucking in impurities at the air inlet during operation, which could damage the internal structure of the fan and help extend the service life of the centrifugal fan.

[0026] The bottom wall of the sound-absorbing cotton 2 is fixedly connected to the reinforcing layer 6, which is made of gradient density aluminum foam. The reinforcing layer 6 protects the sound-absorbing cotton 2 from being stripped by airflow, and the gradient density achieves a gradual change in impedance, thereby increasing the sound reduction effect.

[0027] Both the outer periphery of the double-layer micro-perforated plate 401 and the outer periphery of the guide tube 3 are provided with fixing holes. The fixing holes are internally threaded with fixing bolts 7. The fixing bolts 7 are provided to facilitate the fixing of the double-layer micro-perforated plate 401.

[0028] Sealing rubber rings 8 are fixedly connected to the outer periphery of both ends of the double-layer micro-perforated plate 401. The sealing rubber rings 8 are bonded to the guide tube 3 with sealant. The sealing rubber rings 8 ensure that there are no gaps between the double-layer micro-perforated plate 401 and the inner wall of the guide tube 3, and prevent the airflow from bypassing the double-layer micro-perforated plate 401, thus reducing the noise reduction effect.

[0029] A sealing groove 9 is provided at one end of the flow guide tube 3. A sealing gasket 10 is snapped into the inside of the sealing groove 9. The sealing groove 9 facilitates the installation of the sealing gasket 10.

[0030] One end of the sealing gasket 10 is fixedly connected to one side of the mounting plate 501. The sealing gasket 10 is made of rubber. By setting the sealing gasket 10, it can increase the sealing performance, reduce airflow, and prevent whistling.

[0031] The mounting plate 501 and the guide tube 3 each have several mounting holes on one side. The mounting holes are penetrated by mounting bolts 11, and the surface of the mounting bolts 11 is threaded with limit caps 12. The mounting bolts 11 and limit caps 12 facilitate the installation of the dustproof component 5.

[0032] In this invention, the working steps of the device are as follows:

[0033] First step: When in use, start the centrifugal fan. The airflow passes through the double-layer micro-perforated plate 401 and the honeycomb metal guide plate 402. The porosity of the honeycomb structure can help absorb some sound waves. The double-layer micro-perforated plate 401 increases the path length of the sound waves and can effectively reduce noise through multiple reflections and attenuation. At the same time, the honeycomb metal guide plate 402 evenly distributes the airflow, reduces the non-uniformity of the airflow, and allows it to enter the fan evenly. Meanwhile, the sound-absorbing cotton 2 and the reinforcing layer 6 have sound-absorbing functions, which can reduce the noise generated by airflow changes, turbulence, or airflow collision with the centrifugal fan casing.

[0034] Second step: When in use, after connecting the mounting plate 501 to the guide tube 3, start the centrifugal fan. The dust filter 502 blocks larger impurities in the air, and the microporous membrane 503 filters smaller impurities.

[0035] It should be noted that the device structure and accompanying drawings of this utility model mainly describe the principle of this utility model. In terms of the technical aspects of this design principle, the setting of the power mechanism, power supply system and control system of the device is not fully described. However, under the premise that those skilled in the art understand the principle of the above utility model, the specific details of its power mechanism, power supply system and control system can be clearly understood. The control method in the application document is automatic control through a controller. The control circuit of the controller can be implemented by those skilled in the art through simple programming.

[0036] All standard parts used can be purchased from the market, and can be customized according to the instructions and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the existing technology. The machinery, parts and equipment adopt conventional models in the existing technology, and the structure and principle of the components known to those skilled in the art can be known by those skilled in the art through technical manuals or conventional experimental methods.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-stage noise reduction and flow guiding structure for a centrifugal fan, comprising a centrifugal fan body (1), characterized in that: The inner wall of the centrifugal fan body (1) is fixedly connected with sound-absorbing cotton (2), and one end of the centrifugal fan body (1) is fixedly connected with a guide tube (3). The inner wall of the guide tube (3) is fixedly connected with a noise reduction component (4). One end of the guide tube (3) is provided with a dustproof component (5). The noise reduction component (4) includes a double-layer micro-perforated plate (401) provided on the inner wall of the guide tube (3). A honeycomb metal guide plate (402) is fixedly connected inside the double-layer micro-perforated plate (401). The dustproof component (5) includes an installation plate (501) provided on one end of the guide tube (3). A dustproof filter (502) is fixedly connected to the middle of the surface of the installation plate (501). A filter microporous membrane (503) is glued to the inner wall of the dustproof filter (502).

2. The multi-stage noise reduction and flow guiding structure for a centrifugal fan according to claim 1, characterized in that: The bottom wall of the sound-absorbing cotton (2) is fixedly connected to a reinforcing layer (6), and the material of the reinforcing layer (6) is gradient density aluminum foam.

3. The multi-stage noise reduction and flow guiding structure for a centrifugal fan according to claim 1, characterized in that: The outer periphery of the double-layer micro-perforated plate (401) and the outer periphery of the guide tube (3) are both provided with fixing holes, and the fixing holes are internally threaded with fixing bolts (7).

4. The multi-stage noise reduction and flow guiding structure for a centrifugal fan according to claim 1, characterized in that: The outer periphery of both ends of the double-layer micro-perforated plate (401) is fixedly connected with sealing rubber rings (8), and the sealing rubber rings (8) are bonded to the guide tube (3) with sealant.

5. The multi-stage noise reduction and flow guiding structure for a centrifugal fan according to claim 1, characterized in that: One end of the guide tube (3) is provided with a sealing groove (9), and a sealing gasket (10) is snapped into the inside of the sealing groove (9).

6. The multi-stage noise reduction and flow guiding structure for a centrifugal fan according to claim 5, characterized in that: One end of the sealing gasket (10) is fixedly connected to one side of the mounting plate (501), and the sealing gasket (10) is made of rubber.

7. The multi-stage noise reduction and flow guiding structure for a centrifugal fan according to claim 1, characterized in that: The mounting plate (501) and the guide tube (3) each have several mounting holes on one side. The mounting holes are filled with mounting bolts (11), and the mounting bolts (11) are threaded with limit caps (12).

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