A centrifugal fan air outlet noise reduction structure

Abstract

The utility model discloses a centrifugal fan air outlet noise reduction structure relates to centrifugal fan noise reduction technical field, including centrifugal fan body, the air outlet end of centrifugal fan body is fixedly connected with the frame through the fixed assembly, the frame is in the inside and is set up the ventilation groove that is in accord with the size of centrifugal fan body air outlet, the top of frame is close to the side of centrifugal fan body and is seted up the insertion slot, the insertion slot is connected with the insertion frame through the limiting assembly, the insertion frame is installed the filter screen, the frame is located in the insertion frame and is seted up the noise reduction subassembly in the side away from centrifugal fan body. The utility model discloses through the coaxial airflow channel design, the flow noise reduction subassembly and the filter structure of quick detachable cooperation, realize the optimization unity of noise reduction, impurity filtration and the convenient maintenance of later period, guarantee structure stable operation and reduce the use maintenance cost.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal fan noise reduction technology, and in particular to a noise reduction structure for the air outlet of a centrifugal fan. Background Technology

[0002] Centrifugal fans, widely used in industrial and civilian gas conveying equipment, have always been a source of significant noise pollution. Airflow noise at the outlet is a major contributor; high-speed airflow within the outlet channel easily creates turbulence and eddies, generating noticeable noise that not only affects working comfort but may also harm the physical and mental health of workers, while simultaneously causing noise pollution to the surrounding environment. To mitigate this issue, various noise reduction structures for centrifugal fan outlets have emerged in the relevant technological fields. These structures regulate airflow by incorporating guide or noise-reducing components to reduce noise propagation.

[0003] Existing noise reduction structures for centrifugal fan outlets still have significant technical defects in practical use. Most noise reduction structures lack effective impurity filtration components, allowing impurities in the airflow to easily adhere to the surface of the noise reduction components, causing channel blockage and further affecting the noise reduction effect and equipment operational stability. In addition, the few structures with filtration or noise reduction components often use fixed connections, making disassembly and assembly cumbersome and subsequent maintenance and cleaning inconvenient, increasing usage and maintenance costs and making it difficult to achieve synergistic optimization of noise reduction, filtration, and ease of maintenance. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a noise reduction structure for the air outlet of a centrifugal fan.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A noise reduction structure for a centrifugal fan outlet includes a centrifugal fan body. A frame is fixedly connected to the outlet end of the centrifugal fan body via a fixing component. A ventilation slot matching the size of the outlet of the centrifugal fan body is provided inside the frame. A plug-in slot is provided on the top side of the frame near the centrifugal fan body. A plug-in frame is connected to the plug-in slot via a limiting component. A filter screen is installed on the plug-in frame. A noise reduction component is provided inside the frame on the side of the plug-in frame away from the centrifugal fan body.

[0007] As a further improvement of this utility model, the fixing component includes a mounting block fixedly connected to the air outlet end of the centrifugal fan body. The mounting block has a first through groove that matches the size of the air outlet of the centrifugal fan body. The top of the mounting block has a connecting groove that communicates with the first through groove. A connecting block is inserted into the connecting groove. The frame is fixedly connected to the side wall of the connecting block. The connecting block also has a second through groove that matches the size of the air outlet of the centrifugal fan body.

[0008] As a further improvement of this utility model, the first through groove, the second through groove, and the ventilation groove are all on the same axis as the air outlet of the centrifugal fan body.

[0009] As a further improvement of this utility model, the limiting component includes a connecting plate disposed above the frame. A U-shaped frame is fixedly connected to one end of the connecting plate. Two fixed frames are fixedly connected to the top of the insertion frame. Each of the two fixed frames has a limiting groove. The two protrusions at both ends of the U-shaped frame are respectively inserted into the two limiting grooves. A fixing plate is slidably sleeved on the other end of the connecting plate. The fixing plate is fixedly connected to the top of the frame. Springs are fixedly connected to both sides of the fixing plate on both sides of the connecting plate. The other ends of the two springs are fixedly connected to the side wall of the U-shaped frame. A toggle block fixedly connected to the connecting plate is provided on one side of the fixing plate.

[0010] As a further improvement of this utility model, the noise reduction component includes a plurality of first guide plates fixedly connected to the inner wall of the ventilation slot, and a plurality of second guide plates fixedly connected to each of the plurality of first guide plates, and the plurality of first guide plates are arranged perpendicularly to the plurality of second guide plates.

[0011] As a further improvement of this utility model, a mounting base is fixedly connected to the bottom of the centrifugal fan body, and the mounting base is provided with a plurality of mounting holes for fixed installation.

[0012] As a further improvement of this utility model, a handle is provided between the two fixing brackets, and the handle is fixedly connected to the top of the plug-in frame.

[0013] As a further improvement of this utility model, the connecting block is fixedly connected to the connecting groove by a plurality of fixing bolts.

[0014] The beneficial effects of this utility model are:

[0015] The structural design, with the first and second channels coaxially aligned with the ventilation channel, effectively ensures smooth airflow along a straight line, reducing airflow resistance and eddy current generation. Simultaneously, a noise reduction component, composed of multiple first and second guide plates arranged vertically, achieves secondary airflow guidance and significantly reduces noise during airflow transport. Combined with a plug-in frame and filter that can be quickly installed and removed via a limiting component, it filters impurities in the airflow to prevent internal blockage. The filter can be easily cleaned and replaced by moving a lever or using a hand handle. The detachable connection design of the fixing components further enhances ease of maintenance, achieving synergistic optimization of noise reduction, filtration, and maintenance convenience. This ensures stable overall structural operation while reducing usage and maintenance costs.

[0016] This invention achieves an optimized balance between noise reduction, impurity filtration, and ease of maintenance through the coordinated design of a coaxial airflow channel, a flow-guiding and noise-reducing component, and a quickly detachable filter structure. This ensures stable operation of the structure and reduces usage and maintenance costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a noise reduction structure for the air outlet of a centrifugal fan proposed in this utility model;

[0018] Figure 2 This utility model provides a structural diagram of the frame, fixing components, insertion slot, first through slot, second through slot, limiting components, insertion frame, and filter screen connection of a centrifugal fan outlet noise reduction structure.

[0019] Figure 3 for Figure 2 Partial component separation diagram;

[0020] Figure 4 This is a schematic diagram of the connection of the noise reduction components in the noise reduction structure of the centrifugal fan outlet proposed in this utility model;

[0021] Figure 5 for Figure 2 Enlarged view of point A in the middle.

[0022] In the diagram: 1 Centrifugal fan body, 2 Mounting block, 3 Fixing bolt, 4 Connecting groove, 5 Connecting block, 6 Frame, 7 Ventilation groove, 8 First guide plate, 9 Second guide plate, 10 Insertion groove, 11 Insertion frame, 12 Handle, 13 Fixing bracket, 14 Limiting groove, 15 U-shaped bracket, 16 Connecting plate, 17 Spring, 18 Fixing plate, 19 Actuating block, 20 Filter screen, 21 Mounting base, 22 First through groove, 23 Second through groove. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0024] Figures 1-5 A noise reduction structure for the outlet of a centrifugal fan includes a centrifugal fan body 1. A mounting base 21 is fixedly connected to the bottom of the centrifugal fan body 1. The mounting base 21 has multiple mounting holes for fixed installation. The mounting base 21 provides a stable support foundation for the centrifugal fan body 1. The multiple mounting holes can be used with external fasteners to securely install the centrifugal fan body 1 in a designated position. A frame 6 is fixedly connected to the outlet end of the centrifugal fan body 1 through a fixing component. The fixing component can achieve a stable connection between the centrifugal fan body 1 and the frame 6, ensuring the structural stability after the centrifugal fan body 1 and the frame 6 are connected, and at the same time ensuring that the airflow from the outlet of the centrifugal fan body 1 can be stably delivered into the frame 6.

[0025] The fixing component includes a mounting block 2 fixedly connected to the air outlet end of the centrifugal fan body 1. The mounting block 2 provides a mounting base for the components of the fixing component and connects the air outlet of the centrifugal fan body 1 with other structural components. The mounting block 2 has a first through groove 22 that matches the size of the air outlet of the centrifugal fan body 1. The top of the mounting block 2 has a connecting groove 4 that communicates with the first through groove 22. A connecting block 5 is inserted into the connecting groove 4. The connecting groove 4 provides a suitable insertion space for the connecting block 5 and is fixed in a detachable manner by multiple fixing bolts 3. The multiple fixing bolts 3 can enhance the connection stability between the connecting block 5 and the connecting groove 4. At the same time, the detachable connection method facilitates the disassembly and maintenance of the connecting block 5 and subsequent connected components. The frame 6 is fixed. Connected to the side wall of the connecting block 5, the connecting block 5 provides stable connection support for the frame 6, realizing the connection and cooperation between the frame 6 and the mounting block 2. The connecting block 5 also has a second through groove 23 that matches the size of the air outlet of the centrifugal fan body 1. The frame 6 has a ventilation groove 7 that matches the size of the air outlet of the centrifugal fan body 1. The ventilation groove 7 provides a flow channel for airflow inside the frame 6, ensuring smooth airflow. The first through groove 22, the second through groove 23 and the ventilation groove 7 are all on the same axis as the air outlet of the centrifugal fan body 1, which can ensure that the airflow discharged from the air outlet of the centrifugal fan body 1 passes through the first through groove 22, the second through groove 23 and the ventilation groove 7 in a straight line, reducing the resistance and eddies generated during airflow transportation.

[0026] A plug-in slot 10 is provided on the top of the frame 6 near the centrifugal fan body 1. A plug-in frame 11 is connected to the plug-in slot 10 through a limiting component. The plug-in slot 10 provides a suitable plug-in installation space for the plug-in frame 11 and limits the installation position of the plug-in frame 11. A filter screen 20 is installed on the plug-in frame 11. The filter screen 20 can filter impurities mixed in the airflow discharged from the outlet of the centrifugal fan body 1, and prevent impurities from entering the interior of the frame 6 and causing blockage of the internal structure.

[0027] The limiting component includes a connecting plate 16 disposed above the frame 6. The connecting plate 16 provides connection support for each component of the limiting component and enables linkage between the components. A U-shaped frame 15 is fixedly connected to one end of the connecting plate 16, and the connecting plate 16 can drive the U-shaped frame 15 to move synchronously. Two fixing frames 13 are fixedly connected to the top of the insertion frame 11. Each fixing frame 13 has a limiting groove 14. The limiting groove 14 can be adapted to the protrusions at both ends of the U-shaped frame 15 to engage and limit the protrusions at both ends of the U-shaped frame 15. The insertion and engagement of the U-shaped frame 15 with the limiting groove 14 can limit the insertion frame 11 and prevent the insertion frame 11 from detaching from the insertion slot 10. A fixing plate 18 is slidably sleeved on the other end of the connecting plate 16. The fixing plate 18 can limit the sliding direction of the connecting plate 16, ensuring that the connecting plate 16 can only slide along its own length. The fixing plate 18 is fixedly connected to the frame 6. At the top, the frame 6 provides a stable mounting base for the fixing plate 18. Springs 17 are fixedly connected to both sides of the connecting plate 16 on the fixing plate 18. The other ends of the two springs 17 are fixedly connected to the side wall of the U-shaped frame 15. The two springs 17 can generate elastic support force for the connecting plate 16, ensuring that the two protrusions of the U-shaped frame 15 can be stably inserted into the limiting groove 14. At the same time, they can provide elastic force for the resetting of the connecting plate 16. A toggle block 19 is provided on one side of the fixing plate 18 and is fixedly connected to the connecting plate 16. The toggle block 19 makes it easy for the operator to apply force to drive the connecting plate 16 to slide, thereby driving the two protrusions of the U-shaped frame 15 to disengage from the limiting groove 14. A handle 12 is provided between the two fixing frames 13. The handle 12 is fixedly connected to the top of the insertion frame 11. The handle 12 makes it easy for the operator to apply force to drive the insertion frame 11 to perform insertion and removal operations in the insertion groove 10, which facilitates the disassembly, replacement and cleaning of the insertion frame 11 and the filter screen 20.

[0028] A noise reduction component is provided inside the frame 6 on the side of the plug-in frame 11 away from the centrifugal fan body 1. The noise reduction component can guide and reduce the noise of the airflow after it has been filtered by the filter screen 20, thereby reducing the noise generated during the airflow delivery process. The noise reduction component includes multiple first guide plates 8 fixedly connected to the inner wall of the ventilation slot 7. The multiple first guide plates 8 can guide and sort the airflow in the ventilation slot 7, regulate the airflow delivery direction, and reduce the noise generated by the collision and eddies between airflows. Multiple second guide plates 9 are fixedly connected to each of the multiple first guide plates 8. The multiple second guide plates 9 can work with the multiple first guide plates 8 to perform secondary airflow guidance and sorting, further optimizing the airflow flow state. The multiple first guide plates 8 are all set perpendicularly to the multiple second guide plates 9. The vertically set first guide plates 8 and second guide plates 9 can form a regular guide channel, improve the smoothness of airflow, and achieve noise reduction of the airflow.

[0029] In use, this utility model first securely installs the centrifugal fan body 1 in the designated working position using the multiple mounting holes on the mounting base 21 and external fasteners, thus completing the overall structure installation and positioning. Then, the connection status of the fixing components is checked to ensure that the connecting block 5 is securely inserted into the connecting groove 4 of the mounting block 2 using multiple fixing bolts 3, ensuring the connection stability between the frame 6 and the air outlet end of the centrifugal fan body 1. Simultaneously, it is confirmed that the first through groove 22, the second through groove 23, and the ventilation groove 7 are on the same axis, providing a foundation for smooth airflow.

[0030] Next, the installation of the plug-in frame 11 is performed. The operator holds the handle 12 and aligns the plug-in frame 11 with the filter screen 20 with the plug-in groove 10 on the top of the frame 6, inserting it along the guide direction of the plug-in groove 10 until the plug-in frame 11 is completely fitted with the bottom limiting surface of the plug-in groove 10. During this process, the spring 17 in the limiting component is in a naturally extended state, driving the connecting plate 16 and the U-shaped frame 15 to maintain their initial positions. When the plug-in frame 11 is fully inserted, the two fixing frames 13 move to the designated positions simultaneously with the plug-in frame 11. The protrusions at both ends of the U-shaped frame 15 are precisely aligned with the limiting grooves 14 on the two fixing frames 13. The elastic force of the spring 17 pushes the protrusions at both ends of the U-shaped frame 15 into the limiting grooves 14. Through the engaging cooperation between the U-shaped frame 15 and the limiting grooves 14, the plug-in frame 11 is limited and fixed in the plug-in groove 10, preventing the plug-in frame 11 from shifting during airflow.

[0031] After the centrifugal fan body 1 is started, the airflow discharged from the outlet of the centrifugal fan body 1 passes sequentially through the first through slot 22 of the mounting block 2 and the second through slot 23 of the connecting block 5, and enters the ventilation slot 7 of the frame 6. The airflow first passes through the filter screen 20 on the plug frame 11. The filter screen 20 filters impurities mixed in the airflow to prevent impurities from entering the subsequent noise reduction components and causing blockage. The filtered airflow continues to flow into the noise reduction components in the ventilation slot 7. Multiple first guide plates 8 perform initial airflow guidance and straightening, and regulate the airflow direction to reduce collisions and eddies between airflows. At the same time, multiple second guide plates 9 on the multiple first guide plates 8 cooperate with the first guide plates 8 to perform secondary airflow guidance and straightening. Through the vertically set regular guide channel, the airflow state is further optimized, and the noise generated during airflow is reduced. Finally, the noise-reduced airflow is discharged from the end of the ventilation slot 7 away from the centrifugal fan body 1.

[0032] When the filter 20 needs cleaning or replacement, the operator moves the actuating block 19 towards the U-shaped frame 15. The actuating block 19 causes the connecting plate 16 to slide along the direction defined by the fixed plate 18. Simultaneously, the connecting plate 16 moves the U-shaped frame 15, causing the protrusions at both ends of the U-shaped frame 15 to gradually disengage from the limiting grooves 14 on the fixed frame 13. During this process, the connecting plate 16 compresses the springs 17 on both sides, causing the springs 17 to undergo elastic deformation. Once the protrusions at both ends of the U-shaped frame 15 have completely disengaged from the limiting grooves 14, the limiting and fixing state of the insertion frame 11 is released. The operator then holds the handle 12 and pulls out the insertion frame 11 along the guide direction of the insertion groove 10, allowing the filter 20 to be cleaned or replaced. After cleaning or replacement, repeat the above installation operation of the plug-in frame 11, loosen the toggle block 19, the elastic deformation of the spring 17 is restored, push the connecting plate 16 and the U-shaped frame 15 to reset, and the two protrusions at both ends of the U-shaped frame 15 are re-inserted into the limiting groove 14 to complete the re-fixing of the plug-in frame 11 and ensure the subsequent stable operation of this utility model.

[0033] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A noise reduction structure for the outlet of a centrifugal fan, comprising a centrifugal fan body (1), characterized in that, The air outlet end of the centrifugal fan body (1) is fixedly connected to a frame (6) by a fixing component. A ventilation slot (7) matching the size of the air outlet of the centrifugal fan body (1) is provided in the frame (6). A plug-in slot (10) is provided on the top of the frame (6) near the centrifugal fan body (1). A plug-in frame (11) is connected in the plug-in slot (10) by a limiting component. A filter screen (20) is installed on the plug-in frame (11). A noise reduction component is provided in the frame (6) on the side of the plug-in frame (11) away from the centrifugal fan body (1).

2. The noise reduction structure for the air outlet of a centrifugal fan according to claim 1, characterized in that, The fixing component includes a mounting block (2) fixedly connected to the air outlet end of the centrifugal fan body (1). The mounting block (2) has a first through groove (22) that matches the size of the air outlet of the centrifugal fan body (1). The top of the mounting block (2) has a connecting groove (4) that communicates with the first through groove (22). A connecting block (5) is inserted into the connecting groove (4). The frame (6) is fixedly connected to the side wall of the connecting block (5). The connecting block (5) also has a second through groove (23) that matches the size of the air outlet of the centrifugal fan body (1).

3. The noise reduction structure for the air outlet of a centrifugal fan according to claim 2, characterized in that, The first through slot (22), the second through slot (23), and the ventilation slot (7) are all on the same axis as the air outlet of the centrifugal fan body (1).

4. The noise reduction structure for the outlet of a centrifugal fan according to claim 1, characterized in that, The limiting component includes a connecting plate (16) disposed above the frame (6). One end of the connecting plate (16) is fixedly connected to a U-shaped frame (15). The top of the plug-in frame (11) is fixedly connected to two fixed frames (13). Each of the two fixed frames (13) has a limiting groove (14). The two ends of the U-shaped frame (15) are respectively inserted into the two limiting grooves (14). A fixing plate (18) is slidably sleeved on the other end of the connecting plate (16). The fixing plate (18) is fixedly connected to the top of the frame (6). Springs (17) are fixedly connected to both sides of the fixing plate (16). The other ends of the two springs (17) are fixedly connected to the side wall of the U-shaped frame (15). A toggle block (19) fixedly connected to the connecting plate (16) is provided on one side of the fixing plate (18).

5. The noise reduction structure for the air outlet of a centrifugal fan according to claim 1, characterized in that, The noise reduction component includes multiple first guide plates (8) fixedly connected to the inner wall of the ventilation slot (7), and multiple second guide plates (9) fixedly connected to each of the multiple first guide plates (8), and the multiple first guide plates (8) are arranged perpendicularly to the multiple second guide plates (9).

6. The noise reduction structure for the air outlet of a centrifugal fan according to claim 1, characterized in that, The bottom of the centrifugal fan body (1) is fixedly connected to a mounting base (21), and the mounting base (21) has multiple mounting holes for fixed installation.

7. The noise reduction structure for the outlet of a centrifugal fan according to claim 4, characterized in that, A handle (12) is provided between the two fixing brackets (13), and the handle (12) is fixedly connected to the top of the plug frame (11).

8. The noise reduction structure for the air outlet of a centrifugal fan according to claim 2, characterized in that, The connecting block (5) is fixedly connected to the connecting groove (4) by multiple fixing bolts (3).

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