Fan silencing device

Abstract

The utility model relates to the technical field of fan noise elimination and reduction, in particular to a fan noise elimination device which comprises a noise elimination shell, the noise elimination shell is of a cavity structure formed by an outer shell and a perforated plate inside the outer shell, sound absorption and insulation materials are filled in a cavity, the noise elimination shell wraps the outer portion of a fan body, and an air layer is formed between the noise elimination shell and the fan outer shell. The silencing shell comprises an upper silencing body and a lower silencing body which are detachably connected, a sealing gasket is arranged on the contact face between the upper silencing body and the lower silencing body, and a damping supporting assembly is arranged at the bottom of the lower silencing body. The function of overall noise reduction at the air inlet, the air outlet and the machine body is achieved. The fan silencing device in the scheme is manufactured according to the shape of the fan, so that the space is greatly saved, and the aesthetic feeling is improved; and an air layer separation structure is adopted, so that the noise of the machine body is greatly reduced.

Description

Technical Field

[0001] This utility model relates to the field of fan noise reduction technology, and in particular to a fan noise reduction device. Background Technology

[0002] Currently, explosion-proof axial flow fans are widely used in high-noise environments such as coal mining and chemical industries. However, the aerodynamic and mechanical vibration noise (especially at low and medium frequencies) generated during operation can easily distract workers and reduce their work efficiency, thus seriously threatening the health and safety of employees and production. To address this issue, silencers at the air inlet and outlet (such as patent ZL201520911118.X) are commonly used in the market. These silencers use an impedance composite sound-absorbing structure (perforated plate + sound-absorbing cotton) to attenuate airflow noise. However, in practical applications, the following significant drawbacks still exist: while the noise at the fan inlet and outlet is greatly reduced, the noise radiating outward from the middle of the fan body is particularly loud, resulting in poor overall noise reduction. The main reason for this is that although silencers are used at the fan inlet and outlet, the fan body itself does not take effective noise reduction measures, resulting in unsatisfactory noise reduction. Therefore, there is an urgent need for a fan silencer device that can effectively reduce noise in the fan body. Utility Model Content

[0003] To solve the above-mentioned technical problems, the present invention adopts the following technical solution.

[0004] Design a fan noise reduction device, including a noise reduction shell, wherein the noise reduction shell is a cavity structure formed by an outer shell and an inner perforated plate, and the cavity is filled with sound-absorbing and sound-insulating material. The noise reduction shell covers the outside of the fan body and forms an air layer between the noise reduction shell and the fan outer shell.

[0005] The silencing housing includes a detachably connected upper silencing body and a lower silencing body, and a sealing gasket is provided at the contact surface between the upper silencing body and the lower silencing body. The bottom of the lower silencing body is provided with a shock-absorbing support assembly.

[0006] Preferably, the bottom of the upper silencer and the top of the lower silencer are connected by transverse flanges, and the sealing gasket is disposed between the transverse flanges.

[0007] Preferably, longitudinal flanges that are in sealing contact with the fan are provided at both ends of the sound-absorbing housing. A connecting plate one is fixedly connected to one end of the longitudinal flange, and a connecting plate two is fixedly connected to the top of the fan. The connecting plate one and the connecting plate two are fixedly connected.

[0008] Preferably, the vibration damping support assembly includes a base plate, a leg guard plate connected to the base plate, and a vibration damping pad on the base plate. The leg guard plate wraps around the fan support leg, and the base plate is connected to the fan support leg through the vibration damping pad.

[0009] Preferably, the shock-absorbing pad is made of rubber or has an air spring structure.

[0010] Preferably, a plurality of sound-insulating cover plate assemblies are provided on the top of the upper sound-absorbing body. The sound-insulating cover plate assemblies cover the oil inlet and terminal area of ​​the fan respectively. The sound-insulating cover plate assembly includes a sound-insulating cover plate covering the top of the oil inlet and terminal respectively, a sound-insulating plate located between the sound-insulating cover plate and the oil inlet and terminal, and a sealing skin provided at the joint between the sound-insulating cover plate and the sound-insulating plate.

[0011] Preferably, the soundproof cover is fixed to the soundproof board by hinges and latches.

[0012] Preferably, the thickness of the air layer is 50-100 mm.

[0013] Preferably, the sound-absorbing shell, sound-insulating cover, sound-insulating plate, and leg guard are cavities composed of metal plates and metal perforated plates, and the cavities are filled with centrifugal glass wool wrapped with glass fiber cloth.

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

[0015] 1. This utility model covers the main body of the fan with a wrap-around sound-absorbing shell (including perforated plates and sound-absorbing and insulating materials), combined with an air layer design, which significantly absorbs the mid-to-high frequency noise radiated by the machine body. It solves the limitation of traditional silencers that only deal with the noise of the air inlet / outlet, and achieves the function of overall noise reduction of the machine body. The opening areas such as the oil inlet and terminal are equipped with sound-insulating cover plates (including sealing skin and centrifugal glass wool) to block the noise leakage path, and the overall noise reduction effect is significantly improved compared with the existing technology.

[0016] 2. Vibration damping support components (rubber damping pads or air springs) absorb the mechanical vibration energy during the operation of the fan, reduce the vibration transmission rate, prevent vibration from causing secondary noise radiation through the rigid structure, and extend the service life of the fan and surrounding equipment.

[0017] 3. The upper and lower silencers are designed as separate units with flange assemblies. During installation, only the bolt holes need to be aligned and tightened, making it suitable for narrow spaces (such as coal mine tunnels). The soundproof cover uses a hinge and locking structure, so the entire unit does not need to be disassembled when maintaining the oil inlet and terminal, reducing operation time. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a top view of the structure of this utility model;

[0020] Figure 3 This is a side view structural diagram of the present invention;

[0021] The following are the labels in the diagram: 1. Fan, 2. Horizontal flange, 3. Oil inlet, 4. Sound insulation plate, 5. Sound insulation cover, 6. Terminal block, 7. Hinge, 8. Locking buckle, 9. Upper silencer, 10. Sealing skin, 11. Connecting plate one, 12. Longitudinal flange, 13. Connecting plate two, 14. Sealing element, 15. Housing, 16. Perforated plate, 17. Sound-absorbing and insulating material, 18. Lower silencer, 19. Sealing gasket, 20. Base plate, 21. Leg guard plate, 22. Vibration damping pad block. Detailed Implementation

[0022] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0023] Example 1

[0024] A fan noise reduction device, taking a cylindrical noise reduction structure as an example, such as... Figures 1 to 3 As shown, the device includes a sound-absorbing shell, which consists of an outer shell 15 and an internal perforated plate 16 forming a cavity structure. Sound-absorbing and insulating material 17 is filled within the cavity. The sound-absorbing shell covers the exterior of the main body of the fan 1, forming an air layer between it and the outer shell 15. To enhance sound insulation, the thickness of the air layer is set to 50-100mm. Noise radiated from the machine body enters the cavity of the sound-absorbing shell through the perforated plate 16. The sound waves are repeatedly refracted within the centrifugal glass wool, and the sound energy is converted into heat energy and consumed.

[0025] The silencer housing includes a detachably connected upper silencer 9 and a lower silencer 18, with a sealing gasket 19 at the contact surface between the upper silencer 9 and the lower silencer 18. The bottom of the upper silencer 9 and the top of the lower silencer 18 are connected by transverse flanges 2, with the sealing gasket 19 positioned between the transverse flanges 2. Longitudinal flanges 12 are provided at both ends of the silencer housing to seal against the fan 1. The sealing element 14 here can be a sealing skin 10. The longitudinal flanges 12 are used to connect to the inlet / outlet silencers of the fan 1 to achieve overall noise reduction. A connecting plate 11 is fixedly connected to one end of the longitudinal flange 12, and a connecting plate 13 is fixedly connected to the top of the fan 1. The connecting plate 11 and the connecting plate 13 are fixedly connected. The transverse flanges 2, longitudinal flanges 12, connecting plate 11, connecting plate 13, and bottom support plate 20 are all made of metal plates. The fan 1 is supported by the connecting plate 11, the connecting plate 13, and bolts, which support the entire silencer device.

[0026] The bottom of the lower silencer 18 is equipped with a vibration damping support assembly to block the transmission of vibration from the fan 1. The vibration damping support assembly includes a base plate 20, a leg guard plate 21 connected to the base plate 20, and vibration damping pads 22 disposed on the base plate 20. The leg guard plate 21 covers the support legs of the fan 1, and the base plate 20 is connected to the support legs of the fan 1 through the vibration damping pads 22. The vibration damping pads 22 are either rubber damping sheets or air spring dampers.

[0027] Multiple soundproof cover plate assemblies 5 are provided on the top of the upper sound-absorbing body 9 to block noise leakage. The soundproof cover plate assemblies 5 cover the oil inlet 3 and terminal 6 areas of the fan 1 respectively. The soundproof cover plate assemblies 5 include soundproof cover plates 5 covering the top of the oil inlet 3 and terminal 6 respectively, soundproof plates 4 located between the soundproof cover plates 5 and the oil inlet 3 and terminal 6, and sealing skin 10 provided at the joint between the soundproof cover plates 5 and the soundproof plates 4. The soundproof cover plates 5 are fixed to the soundproof plates 4 by hinges 7 and latches 8. The sealing skin 10 has a structure containing air bubbles. In this embodiment, the sealing gasket 19 and the sealing skin 10 are made of rubber or silicone. The vibration of the fan 1 is transmitted to the vibration damping pad 22 through the base plate 20. The rubber / air spring structure absorbs the vibration energy and reduces outward propagation.

[0028] The sound-absorbing shell, sound-insulating cover plate 5, sound-insulating plate 4, and leg guard plate 21 are cavities composed of metal plates and metal perforated plates, and the cavities are filled with centrifugal glass wool wrapped with glass fiber cloth.

[0029] During installation, first place the lower silencer 18, then place the fan 1 support leg on the shock-absorbing pad 22 of the base plate 20, ensuring the contact surface is flat. Next, cover the top of the fan 1 with the upper silencer 9. Secure the connecting plate 11 and connecting plate 13 on the longitudinal flange 12 with bolts to form an integral frame. Then align the transverse flange 2 of the upper silencer 9 and the lower silencer 18, insert the sealing gasket 19, and tighten it with bolts. Close the sound insulation cover 5 at the oil inlet 3 and terminal 6 with the hinge 7 and fix it with the lock 8 to ensure the sealing skin 10 is pressed tightly. Then, install the inlet / outlet silencer and start the fan 1 for testing.

[0030] The principle of this utility model is as follows: When the fan 1 is running, the radiated noise it generates is absorbed by the sound-absorbing structures in the sound-absorbing shell, the oil inlet 3 and the terminal block 6, the sound insulation cover 5, the sound insulation plate 4 and the leg guard plate 21, which convert the sound energy into heat energy and consume it, thereby reducing the noise. The vibration generated by the fan 1 body is blocked by the contact sealing skin 10 and the shock-absorbing pad 22, and is consumed by the kinetic energy of the back-and-forth small movement of the casing, which reduces the transmission to the outside world, thereby greatly reducing the noise of the machine body.

[0031] 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 fan noise reduction device, characterized in that, The device includes a sound-absorbing shell, which consists of an outer shell and an internal perforated plate forming a cavity structure, and the cavity is filled with sound-absorbing and sound-insulating material. The sound-absorbing shell covers the outside of the fan body and forms an air layer between it and the fan shell. The silencing housing includes a detachably connected upper silencing body and a lower silencing body, and a sealing gasket is provided at the contact surface between the upper silencing body and the lower silencing body. The bottom of the lower silencing body is provided with a shock-absorbing support assembly.

2. The fan silencing device as described in claim 1, characterized in that: The bottom of the upper silencer and the top of the lower silencer are connected by transverse flanges, and the sealing gasket is placed between the transverse flanges.

3. The fan silencing device as described in claim 1, characterized in that: The silencer housing has longitudinal flanges at both ends that are in sealing contact with the fan. A connecting plate one is fixedly connected to one end of the longitudinal flange, and a connecting plate two is fixedly connected to the top of the fan. The connecting plate one and the connecting plate two are fixedly connected.

4. The fan silencing device as described in claim 1, characterized in that: The vibration damping support assembly includes a base plate, a leg guard plate connected to the base plate, and a shock-absorbing pad on the base plate. The leg guard plate wraps around the fan support leg, and the base plate is connected to the fan support leg through the shock-absorbing pad.

5. The fan silencing device as described in claim 4, characterized in that: The shock-absorbing pads are made of rubber or have an air spring structure.

6. The fan silencing device as described in claim 4, characterized in that: Multiple soundproof cover plate assemblies are provided on the top of the upper sound-absorbing body. The soundproof cover plate assemblies cover the oil inlet and terminal area of ​​the fan respectively. The soundproof cover plate assembly includes a soundproof cover plate covering the top of the oil inlet and terminal respectively, a soundproof plate located between the soundproof cover plate and the oil inlet and terminal, and a sealing skin provided at the joint between the soundproof cover plate and the soundproof plate.

7. The fan silencing device as described in claim 6, characterized in that: The soundproof cover is fixed to the soundproof board by hinges and latches.

8. The fan silencing device as described in claim 1, characterized in that: The thickness of the air layer is 50-100mm.

9. The fan silencing device as described in claim 4, characterized in that: The sound-absorbing shell, sound-insulating cover, sound-insulating plate, and leg guard are cavities composed of metal plates and perforated metal plates, and the cavities are filled with centrifugal glass wool wrapped in glass fiber cloth.

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