Noise reduction structure of centrifugal fan

Abstract

The utility model relates to the technical field of centrifugal fans, in particular to a centrifugal fan noise reduction structure which comprises a fan body, an air inlet is formed in the top of the fan body, an air outlet is formed in the surface of the fan body, a base is welded to the bottom of the fan body, and a noise reduction assembly is arranged on the fan body. The noise reduction assembly comprises a first noise reduction pipe, the first noise reduction pipe is fixedly connected to the air inlet, a second noise reduction pipe is installed on the air outlet, a noise reduction box is fixedly connected to the rear side of the draught fan body, and noise reduction cotton adheres to the front surface and the rear surface of the draught fan body. According to the scheme, by designing the noise reduction assembly, when the centrifugal fan operates, noise generated during operation of the centrifugal fan can be reduced from multiple aspects, so that the operation noise reduction effect of the centrifugal fan is effectively improved, and the operation environment of the centrifugal fan is improved to a certain extent.

Description

Technical Field

[0001] The present application relates to the technical field of centrifugal fans, and in particular to a noise reduction structure for a centrifugal fan. Background Art

[0002] A centrifugal fan is a machine that relies on input mechanical energy to increase gas pressure and discharge gas. It is a driven fluid machine. Centrifugal fans are widely used in ventilation, dust removal and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings; ventilation and draft in boilers and industrial furnaces; cooling and ventilation in air conditioning equipment and household appliances; drying and sorting of grains; inflation and propulsion of wind tunnel wind sources and hovercraft, etc. Centrifugal fans generate a lot of noise when working. The source of this noise is, on the one hand, the vibration of the machine operation, and on the other hand, the friction vibration generated when the air flow passes through the inner cavity of the centrifugal fan. In the workshop, corresponding measures need to be taken to reduce the noise generated by the centrifugal fan and improve the operating environment of the centrifugal fan.

[0003] Currently, the noise generated by centrifugal fans during operation includes aerodynamic noise and mechanical vibration noise. Aerodynamic noise accounts for the majority of the total noise, so when reducing the noise of centrifugal fans, the focus is on aerodynamic noise. However, in actual operation, the problem of mechanical vibration noise cannot be ignored. Therefore, to address the above issues, this application provides a centrifugal fan noise reduction structure. Utility Model Content

[0004] In order to solve the problem of high noise during operation of a centrifugal fan, the present application provides a noise reduction structure for a centrifugal fan.

[0005] The present application provides a centrifugal fan noise reduction structure, including a fan body, an air inlet is provided on the top of the fan body, an air outlet is opened on the surface of the fan body, a base is welded to the bottom of the fan body, and a noise reduction component is provided on the fan body. The noise reduction component includes a first noise reduction pipe, the first noise reduction pipe is fixedly connected to the air inlet, a second noise reduction pipe is installed on the air outlet, a noise reduction box is fixedly connected to the rear side of the fan body, and silencer plates are fixedly connected to the inner walls of the first noise reduction pipe and the second noise reduction pipe.

[0006] Preferably, the noise reduction box is arranged above the base, and fixing plates are symmetrically fixedly connected on both sides of the base.

[0007] Preferably, a motor is installed on the rear side of the fan body, and the motor is fixed to the base through a fixing bracket.

[0008] Preferably, the motor is arranged inside the noise reduction box, and a plurality of heat dissipation slots are provided on the rear side of the noise reduction box.

[0009] Preferably, sound-absorbing cotton is pasted on the front and rear surfaces of the fan body.

[0010] In summary, this application has the following beneficial technical effects:

[0011] By designing a noise reduction component, when the centrifugal fan is running, the noise is absorbed by the silencer plates inside the first noise reduction pipe and the second noise reduction pipe, thereby reducing the noise at the air inlet and the air outlet. Then the motor is arranged inside the noise reduction box, and the noise generated by the motor when the motor is running is reduced. At the same time, the noise generated when the fan blades inside the fan body rotate is reduced by the silencer cotton pasted on the fan body. Compared with the existing technology, this design can reduce the noise generated by the operation of the centrifugal fan in many aspects, thereby effectively improving the noise reduction effect of the centrifugal fan and improving the operating environment of the centrifugal fan to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the overall structure of the device in the embodiment of the present application;

[0013] Figure 2 This is a schematic diagram of the rear structure of the device in the embodiment of the present application;

[0014] Figure 3 is a structural diagram of a motor in an embodiment of the present application;

[0015] Figure 4 It is a schematic diagram of the cross-sectional structure of the first noise reduction tube in the embodiment of the present application.

[0016] Explanation of the accompanying symbols: 1. Fan body; 2. Air inlet; 3. Air outlet; 4. Base; 5. Fixing plate; 6. First noise reduction pipe; 7. Second noise reduction pipe; 8. Noise reduction box; 9. Heat dissipation slot; 10. Silencer cotton; 11. Motor; 12. Fixing bracket; 13. Silencer plate. DETAILED DESCRIPTION

[0017] The following is combined with Figure 1 - Figure 4 This application is described in further detail.

[0018] Example:

[0019] A centrifugal fan noise reduction structure is used to reduce noise during centrifugal fan operation. Figure 1, including a fan body 1, an air inlet 2 is provided on the top of the fan body 1, through which external air can enter the fan body 1, an air outlet 3 is opened on the surface of the fan body 1, and high-speed airflow can be conveniently delivered through the air outlet 3, a base 4 is welded on the bottom of the fan body 1, and the device can be placed stably on the ground through the base 4, and fixing plates 5 are symmetrically fixedly connected on both sides of the base 4, and the fixing plates 5 are provided with through holes, and the fixing plates 5 are convenient for installing and fixing the entire device, and a noise reduction component is provided on the fan body 1, which can reduce the noise generated by the operation of the centrifugal fan in many ways;

[0020] When in use, the device is placed stably on the ground through the base 4, and the entire device is installed and fixed through the fixing plate 5. During subsequent operation, the noise reduction component reduces the noise generated by the centrifugal fan in many aspects, thereby improving the noise reduction effect.

[0021] Reference Figure 2 - Figure 4 The noise reduction component includes a first noise reduction tube 6, which is fixedly connected to the air inlet 2. The first noise reduction tube 6 is used to reduce the noise at the air inlet 2. A second noise reduction tube 7 is installed on the air outlet 3. The second noise reduction tube 7 is used to reduce the noise at the air outlet 3. A noise reduction box 8 is fixedly connected to the rear side of the fan body 1. The noise reduction box 8 is used to shield the motor 11, thereby blocking the noise spread during the operation of the motor 11. The noise reduction box 8 is arranged above the base 4. A plurality of heat dissipation slots 9 are opened on the rear side of the noise reduction box 8. The heat dissipation slots 9 facilitate heat dissipation of the motor 11 during operation. Silencers 10 are pasted on the front and back surfaces of the fan body 1 , the noise generated by the rotation of the fan blades inside the fan body 1 is conveniently reduced by the sound-absorbing cotton 10 pasted on the fan body 1. A motor 11 is installed on the rear side of the fan body 1. The motor 11 is fixed to the base 4 through a fixing bracket 12. The motor 11 is arranged inside the noise reduction box 8. The motor 11 is installed inside the noise reduction box 8 so that the noise reduction box 8 blocks the spread of noise when the motor 11 is running. The inner walls of the first noise reduction pipe 6 and the second noise reduction pipe 7 are fixedly connected with a sound-absorbing plate 13. The sound-absorbing plates 13 inside the first noise reduction pipe 6 and the second noise reduction pipe 7 are convenient for absorbing noise.

[0022] During use, the noise is absorbed by the silencer plates 13 inside the first noise reduction tube 6 and the second noise reduction tube 7, thereby reducing the noise at the air inlet 2 and the air outlet 3. Then the motor 11 is arranged inside the noise reduction box 8, and the noise generated when the motor 11 is running is reduced by the motor 11. At the same time, the noise generated when the fan blades inside the fan body 1 rotate is reduced by the silencer cotton 10 pasted on the fan body 1. By reducing the noise of the centrifugal fan from multiple aspects, the noise generated when the centrifugal fan is running is reduced, and the noise reduction effect is improved.

[0023] The embodiment of the present application provides a centrifugal fan noise reduction structure, and its working principle is as follows: when in use, the device is placed stably on the ground through the base 4, and then the entire device is installed and fixed through the fixing plate 5; during subsequent operation, the noise is absorbed by the silencer 13 inside the first noise reduction pipe 6 and the second noise reduction pipe 7, thereby reducing the noise at the air inlet 2 and the air outlet 3, and then the motor 11 is arranged inside the noise reduction box 8, and the noise generated by the operation of the motor 11 is reduced by the motor 11, and at the same time, the noise generated when the fan blades inside the fan body 1 rotate are reduced by the silencer cotton 10 pasted on the fan body 1.

[0024] The above describes an exemplary implementation of a centrifugal fan noise reduction structure provided by the present disclosure with reference to a preferred embodiment. However, it will be understood by those skilled in the art that, without departing from the concept of the present disclosure, various variations and modifications may be made to the above-mentioned specific embodiments, and various technical features and structures proposed in the present disclosure may be combined in various ways without exceeding the scope of protection of the present disclosure, which is determined by the appended claims.

Claims

1. A centrifugal fan noise reduction structure, comprising a fan body (1), characterized in that: The top of the fan body (1) is provided with an air inlet (2), the surface of the fan body (1) is provided with an air outlet (3), the bottom of the fan body (1) is welded with a base (4), and the fan body (1) is provided with a noise reduction component, the noise reduction component comprising a first noise reduction pipe (6), the first noise reduction pipe (6) is fixedly connected to the air inlet (2), the air outlet (3) is installed with a second noise reduction pipe (7), the rear side of the fan body (1) is fixedly connected to a noise reduction box (8), and the inner walls of the first noise reduction pipe (6) and the second noise reduction pipe (7) are both fixedly connected to a silencer plate (13).

2. A centrifugal fan noise reduction structure according to claim 1, characterized in that: The noise reduction box (8) is arranged above the base (4), and fixed plates (5) are symmetrically fixedly connected to both sides of the base (4).

3. The centrifugal fan noise reduction structure according to claim 1, characterized in that: A motor (11) is installed on the rear side of the fan body (1), and the motor (11) is fixed on the base (4) via a fixing frame (12).

4. The centrifugal fan noise reduction structure according to claim 3, characterized in that: The motor (11) is arranged inside the noise reduction box (8), and a plurality of heat dissipation slots (9) are provided on the rear side of the noise reduction box (8).

5. The centrifugal fan noise reduction structure according to claim 1, characterized in that: The front and rear surfaces of the fan body (1) are both pasted with sound-absorbing cotton (10).

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