Fan inner duct structure of centrifugal fan

Abstract

The utility model relates to a new trend system centrifugal fan technical field discloses a fan inner air duct structure of centrifugal fan, including fixed block, the outer wall of fixed block is provided with volute, the inner wall screw thread connection of volute has screw nail no.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal fan technology for fresh air systems, and in particular to an internal air duct structure for a centrifugal fan. Background Technology

[0002] A centrifugal fan for a fresh air system is a centrifugal fan specifically designed for use in fresh air systems. It is mainly used to drive airflow and realize the exchange and circulation of indoor and outdoor air. The centrifugal fan is the core power component, undertaking the important task of introducing fresh outdoor air into the room and expelling stale indoor air to the outside.

[0003] A search revealed Chinese Patent Publication No. CN218959339U, which discloses a hydraulic disc brake device braking performance test bench, including a fan cover, centrifugal fans, and ventilation louvers. Multiple centrifugal fans are included. The fan cover is a rectangular box-type structure, with multiple centrifugal fans installed horizontally side-by-side inside. The fan cover is installed on top of the high-voltage frequency converter cabinet, and its bottom connects to the cabinet, serving as an air inlet. Ventilation vents are located on both sides of the fan cover, with ventilation louvers at each vent. This design is for heat dissipation within the high-voltage frequency converter cabinet. The ventilation system of the multiple centrifugal fans used for heat dissipation has been structurally integrated and modified, integrating them into a single fan cover and unifying the air duct inlet and outlet. This eliminates the need for separate air duct designs for each centrifugal fan, making installation more convenient and improving interchangeability.

[0004] However, the internal air duct of a centrifugal fan is prone to dust and impurities adhering to it, which can cause gas vortices. When the gas enters the volute from the high-speed impeller, it will generate vortex noise, thus increasing the noise of the centrifugal fan during operation. Utility Model Content

[0005] To overcome the above deficiencies, this utility model provides an internal air duct structure for a centrifugal fan, which aims to improve the problem of increased noise during operation of the centrifugal fan caused by vortex noise generated when gas enters the volute.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an internal air duct structure for a centrifugal fan, comprising a fixed block, a volute on the outer wall of the fixed block, a threaded pin connected to the inner wall of the volute, an air inlet shroud fixedly connected to the outer wall of the volute, a threaded pin connected to the outer wall of the volute, a fan wheel threadedly connected to the outer wall of the threaded pin, a sound-absorbing component inside the volute, and a sound-absorbing plate fixedly connected to the inner wall of the volute.

[0007] The above technical solution addresses the issue of vortex noise generated inside the volute after the wind turbine is started. The noise is absorbed by a combination of noise reduction components and noise reduction plates.

[0008] As a further description of the above technical solution, the noise reduction component includes noise reduction cotton, with a first guide groove on the left side wall of the noise reduction cotton and a second guide groove on the right side wall of the noise reduction cotton.

[0009] The above technical solution further reduces noise through the use of guide channel one and guide channel two.

[0010] As a further description of the above technical solution, the inner wall of the sound-absorbing plate is provided with a sound-absorbing through hole.

[0011] The above technical solution enhances the noise reduction function of the sound-absorbing sheet through the sound-absorbing through-hole.

[0012] As a further description of the above technical solution, a nameplate is fixedly connected to the outer wall of the volute.

[0013] The above technical solution allows the nameplate to be used to introduce the performance parameters of the fan.

[0014] As a further description of the above technical solution, a shock-absorbing net is fixedly connected to the outer wall of the wind turbine.

[0015] The above technical solution allows the shock-absorbing mesh to absorb the vibrations generated by the volute.

[0016] As a further description of the above technical solution, the outer wall of the threaded nail is threadedly connected to the inner wall of the fixing block.

[0017] The above technical solution uses threaded nails to connect the fixing block and the volute.

[0018] As a further description of the above technical solution, the outer wall of the wind turbine is disposed on the inner wall of the volute.

[0019] The above technical solution provides an installation location for the wind turbine.

[0020] As a further description of the above technical solution, the outer wall of the shock-absorbing mesh is disposed on the inner wall of the volute.

[0021] The above technical solution provides an installation location for the vibration damping mesh through the volute.

[0022] This utility model has the following beneficial effects:

[0023] 1. In this utility model, by setting a noise reduction component and a noise reduction plate at the position of the volute air duct, the noise reduction plate uses its resonance absorption effect on noise of a specific frequency to reduce the noise intensity entering the air duct and further absorb the remaining noise energy, thereby achieving the effect of weakening noise of different frequency bands and significantly improving the overall noise reduction capability of the centrifugal fan.

[0024] 2. In this utility model, by opening a second guide groove in the silencing component and opening a silencing through hole in the silencing plate, the silencing component and the silencing plate can be adapted to the internal structure and airflow characteristics of the volute duct, thereby further improving the noise reduction efficiency.

[0025] 3. In this utility model, by installing a shock-absorbing net on the rear side of the wind turbine, the vibration amplitude and frequency are reduced, and the vibration propagation path is changed, thereby achieving the effect of gradually attenuating the vibration energy during transmission and reducing the direct impact of vibration on the wind turbine and volute. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural diagram of the internal air duct structure of a centrifugal fan proposed in this utility model;

[0027] Figure 2 This is a partial structural diagram of a threaded nail in the internal air duct structure of a centrifugal fan proposed in this utility model.

[0028] Figure 3 This is a partial structural diagram of the sound-absorbing component of the internal air duct structure of a centrifugal fan proposed in this utility model;

[0029] Figure 4 This is a partial structural diagram of the threaded nails in the internal air duct structure of a centrifugal fan proposed in this utility model.

[0030] Figure 5 This is a partial structural diagram of the guide channel of the internal air duct structure of a centrifugal fan proposed in this utility model.

[0031] Figure 6 This is a partial structural diagram of the sound-absorbing through hole in the internal air duct structure of a centrifugal fan proposed in this utility model.

[0032] Figure 7 This is a partial structural diagram of the nameplate of the internal air duct structure of a centrifugal fan proposed in this utility model.

[0033] Legend:

[0034] 1. Fixing block; 2. Volute; 3. Air inlet cover; 4. Threaded nail one; 5. Threaded nail two; 6. Nameplate; 7. Silencing assembly; 71. Silencing cotton; 72. Guide channel one; 73. Guide channel two; 8. Silencing plate; 9. Silencing through hole; 10. Vibration damping mesh; 11. Fan wheel. Detailed Implementation

[0035] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0036] Reference Figures 1-4 This utility model provides an embodiment of a centrifugal fan's internal air duct structure, including a fixed block 1, a volute 2 on the outer wall of the fixed block 1, a threaded pin 4 threadedly connected to the inner wall of the volute 2, an air inlet shroud 3 fixedly connected to the outer wall of the volute 2, a threaded pin 5 threadedly connected to the outer wall of the volute 2, a fan wheel 11 threadedly connected to the outer wall of the threaded pin 5, a noise reduction assembly 7 inside the volute 2, and a noise reduction plate 8 fixedly connected to the inner wall of the volute 2; wherein, a motor is arranged in the middle of one side of the fan wheel 11, the motor being an external rotor motor, including a rotor magnetic ring and a stator assembly. The rotor magnetic ring is fixed in the inner ring in the middle of one side of the fan wheel, and the stator assembly is connected to the inside of the rotor magnetic ring through a magnetically levitated air gap, with the air gap between the two being 0.2-2mm. In this embodiment, the iron core inside the stator assembly can be selected as a twelve-slot ten-pole or twelve-slot fourteen-pole structure.

[0037] Specifically, by starting the impeller 11, outside air is drawn into the fan. The threaded pin 2 5 fixes the impeller 11 to the inside of the volute 2. During this process, outside air enters the inside of the volute 2 through the impeller duct in front of the impeller 11 and then enters the volute duct covered by the air inlet shroud 3. A sound-absorbing component 7 and a sound-absorbing plate 8 are installed at the volute duct. The sound-absorbing plate 8 absorbs the resonance of noise at a specific frequency, while the sound-absorbing component 7 absorbs the remaining noise energy. This can reduce noise in different frequency bands and significantly improve the overall noise reduction capability of the centrifugal fan.

[0038] Reference Figure 5 The noise reduction component 7 includes noise reduction cotton 71. A first guide groove 72 is provided on the left side wall of the noise reduction cotton 71, and a second guide groove 73 is provided on the right side wall of the noise reduction cotton 71.

[0039] Specifically, the first guide channel 72 and the second guide channel 73 can reduce the airflow resistance between the silencer assembly 7 and the duct wall, and reduce the noise caused by poor airflow.

[0040] Reference Figure 6 The inner wall of the sound-absorbing plate 8 is provided with a sound-absorbing through hole 9;

[0041] Specifically, the silencing through-hole 9 can expand the contact area between the sound and the silencing material, and enhance the silencing ability of the silencing plate 8. By designing the shape of the silencing component 7 and the silencing plate 8 as described above, the silencing component 7 and the silencing plate 8 can be adapted to the internal structure and airflow characteristics of the volute duct, thereby further improving the noise reduction efficiency.

[0042] Reference Figure 7 A nameplate 6 is fixedly connected to the outer wall of the volute 2;

[0043] Specifically, installing a nameplate 6 describing the fan parameters on the volute 2 facilitates subsequent fan maintenance by the user.

[0044] Reference Figure 2 and Figure 3 The outer wall of the threaded pin 4 is threadedly connected to the inner wall of the fixing block 1; the outer wall of the impeller 11 is set on the inner wall of the volute 2.

[0045] Specifically, the threaded nail 4 combines the fixing block 1 and the volute 2 to form an outer shell, which can protect the fan, while the volute 2 provides an installation position and protection for the impeller 11.

[0046] Reference Figure 3 The outer wall of the wind turbine 11 is fixedly connected to a shock-absorbing net 10; the outer wall of the shock-absorbing net 10 is set on the inner wall of the volute 2.

[0047] Specifically, by installing a damping net 10 on the rear side of the wind turbine 11, the vibration generated by the wind turbine 11 is transmitted to the damping net 10, causing it to undergo elastic deformation and absorb some of the vibration energy. At the same time, the damping net 10 generates a damping effect during vibration, consuming vibration energy through internal friction and air resistance, reducing the vibration amplitude and frequency. The setting of the damping net 10 can change the vibration propagation path, thereby achieving the effect of gradually attenuating the vibration energy during transmission and reducing the direct impact of vibration on the wind turbine 11 and the volute 2.

[0048] Working principle: By starting the impeller 11, outside air is drawn into the fan. During this process, the outside air enters the volute 2 through the impeller duct in front of the impeller 11 and then enters the volute duct. Silencing components 7 and silencing plates 8 are installed at the position of the volute duct. The silencing plates 8 resonate and absorb noise at specific frequencies, reducing the noise intensity entering the duct. This can reduce noise at different frequency bands and improve the overall noise reduction capability of the centrifugal fan.

[0049] By opening a second guide groove 73 in the sound-absorbing cotton 71, the second guide groove 73 can reduce the airflow resistance between the sound-absorbing component 7 and the duct wall, and reduce the noise caused by poor airflow. At the same time, by opening a sound-absorbing through hole 9 in the sound-absorbing plate 8, the contact area between the sound and the sound-absorbing material is expanded, and the sound-absorbing capacity of the sound-absorbing plate 8 is enhanced. Thus, the sound-absorbing component 7 and the sound-absorbing plate 8 can be adapted to the internal structure and airflow characteristics of the volute duct, and the noise reduction efficiency can be further improved.

[0050] By installing a damping net 10 on the rear side of the wind turbine 11, the wind turbine 11 will generate vibration when it starts up and transmit it to the damping net 10. Since the damping net 10 is made of rubber, it will undergo elastic deformation. At the same time, the damping net 10 will generate a damping effect during vibration, which will consume vibration energy through internal friction and air resistance, further reducing the vibration amplitude and frequency. The setting of the damping net 10 can change the vibration propagation path, thereby achieving the effect of gradually attenuating the vibration energy during transmission and reducing the direct impact of vibration on the wind turbine 11 and the volute 2.

[0051] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A centrifugal fan internal duct structure, comprising a fixing block (1), characterized in that: The outer wall of the fixed block (1) is provided with a volute (2), the inner wall of the volute (2) is threaded with a threaded nail (4), the outer wall of the volute (2) is fixedly connected with an air inlet hood (3), the outer wall of the volute (2) is threaded with a threaded nail (5), the outer wall of the threaded nail (5) is threaded with a fan wheel (11), the inside of the volute (2) is provided with a sound-absorbing component (7), and the inner wall of the volute (2) is fixedly connected with a sound-absorbing plate (8).

2. The internal air duct structure of a centrifugal fan according to claim 1, characterized in that: The noise reduction component (7) includes noise reduction cotton (71), and a first guide groove (72) is provided on the left side wall of the noise reduction cotton (71), and a second guide groove (73) is provided on the right side wall of the noise reduction cotton (71).

3. The internal air duct structure of a centrifugal fan according to claim 1, characterized in that: The inner wall of the sound-absorbing plate (8) is provided with a sound-absorbing through hole (9).

4. The internal air duct structure of a centrifugal fan according to claim 1, characterized in that: A nameplate (6) is fixedly connected to the outer wall of the volute (2).

5. The internal air duct structure of a centrifugal fan according to claim 1, characterized in that: The outer wall of the wind turbine (11) is fixedly connected with a shock-absorbing net (10).

6. The internal air duct structure of a centrifugal fan according to claim 1, characterized in that: The outer wall of the threaded nail (4) is threaded to the inner wall of the fixing block (1).

7. The internal air duct structure of a centrifugal fan according to claim 1, characterized in that: The outer wall of the wind turbine (11) is set on the inner wall of the volute (2).

8. The internal air duct structure of a centrifugal fan according to claim 5, characterized in that: The outer wall of the shock-absorbing mesh (10) is set on the inner wall of the volute (2).

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