A fan inlet silencer assembly

Abstract

The utility model relates to a related field of silencing assembly, especially a fan air inlet silencing assembly, including outer frame, silencer, support frame, silencing louver, filter screen, damping plate, first sound insulation board and sound insulation roof plate etc.

Description

Technical Field

[0001] This utility model relates to the field of noise reduction components, and in particular to a noise reduction component for a fan inlet. Background Technology

[0002] In circulating fluidized bed boilers, primary and secondary air fans are required. The primary air fan fluidizes the bed material and provides some oxygen for coal combustion, while the secondary air fan supplements the oxygen needed for combustion in the upper part of the furnace, ensuring thorough mixing of coal and air for complete combustion. By properly adjusting the volume and ratio of primary and secondary air, combustion efficiency can be effectively improved and pollutant emissions reduced. However, during operation, the high-velocity airflow generates significant noise due to friction with the air inlet duct. This noise pollution affects the working environment. To reduce noise, silencers are typically installed at the air inlet of the fans. However, due to the high air velocity at the fan inlet, the generated noise is substantial, making it difficult for silencers to effectively eliminate the noise. Consequently, the noise at the fan inlet remains significant, resulting in noise pollution and impacting the working environment. Summary of the Invention

[0003] Therefore, in order to overcome the above-mentioned shortcomings, this utility model provides a fan inlet noise reduction component to solve the above-mentioned technical problems.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a fan inlet silencing assembly, comprising an outer frame, a silencer, a support frame, silencing louvers, a damping plate, a first sound insulation plate, and a sound insulation top plate. The silencer is installed inside the outer frame, and two or more silencing plates are provided inside the silencer. The support frame is located on the top of the outer frame, and several V-shaped silencing louvers are installed along the outer perimeter of the support frame. A gap for air conveying is provided between two adjacent silencing louvers. The damping plate is installed on the outer surface of the outer frame, and a first sound insulation plate is provided at the end of the damping plate away from the outer frame. The sound insulation top plate is installed on the top surface of the support frame, and the outer edge of the support frame is located within the vertical projection range of the bottom surface of the sound insulation top plate.

[0005] Preferably, the sound-absorbing plate includes a perforated plate vertically installed inside the muffler. The perforated plate has a hollow structure and is filled with a second sound-insulating plate.

[0006] Preferably, a filter screen is installed on the top inner side of the muffler, and the bottom surface of the filter screen completely covers all the sound-absorbing plates.

[0007] Preferably, the sound-absorbing louver includes a V-shaped perforated metal plate installed on the outer frame. The perforated metal plate has a hollow structure and a third sound-insulating plate is provided inside the perforated metal plate.

[0008] Preferably, the soundproof roof panel includes two aluminum plates and a core of rock wool sandwiched between the two aluminum plates, wherein the lower aluminum plate is detachably connected to the support frame.

[0009] Preferably, the support frame has an inspection port that extends downward to the top of the outer side of the muffler.

[0010] Preferably, an inspection door is hinged inside the inspection port.

[0011] The beneficial effects of this utility model are:

[0012] This utility model incorporates V-shaped sound-absorbing louvers on a support frame. These louvers repeatedly reflect and absorb sound, causing sound energy to continuously dissipate during propagation, thus improving the sound absorption effect. The damping plate absorbs noise generated by the silencer's vibration and effectively prevents sound from propagating through the ground. The first sound insulation plate further enhances the silencer's noise absorption capacity. The sound-insulating top plate also has a sound-absorbing effect, blocking sound from propagating from the top while reflecting and absorbing sound entering the sound-absorbing louvers, thus achieving a dual function of sound insulation and sound absorption. By enhancing the sound absorption effect of the air inlet of the electric boiler fan through multiple enhancements, noise pollution is reduced, which is beneficial to improving the working environment. Attached Figure Description

[0013] Figure 1 This is a front view cross-sectional structural diagram of the support frame connection of this utility model;

[0014] Figure 2 This is a schematic diagram of the soundproof roof panel connection structure of this utility model;

[0015] Figure 3 This is a schematic diagram of the sound-absorbing louver structure of this utility model;

[0016] Figure 4 This is a schematic diagram of the cross-sectional structure of the soundproof roof panel of this utility model.

[0017] Among them: outer frame-1, silencer-2, support frame-3, sound-absorbing louvers-4, filter screen-5, damping plate-6, first sound insulation plate-7, inspection port-8, inspection door-9, sound insulation top plate-10, perforated plate-11, second sound insulation plate-12, metal perforated plate-41, third sound insulation plate-42, aluminum plate-101, and sandwich rock wool-102. Detailed Implementation

[0018] To further explain the technical solution of this utility model, a detailed description is provided below through specific embodiments.

[0019] like Figures 1 to 4As shown, this utility model provides a fan inlet silencing component, including an outer frame 1, a silencer 2, a support frame 3, a silencing louver 4, a damping plate 6, a first sound insulation plate 7, and a sound insulation top plate 10. The outer frame 1 is a cylindrical structure that runs vertically through the fan. The silencer 2 is locked and fixed inside the outer frame 1, and the silencer 2 is provided with two or more sound insulation plates that are evenly distributed inside the silencer 2.

[0020] A filter screen 5 is locked and fixed to the top of the inner side of the muffler 2. The bottom surface of the filter screen 5 completely covers all the sound-absorbing plates, and the filter screen 5 reduces the entry of external dust and impurities into the muffler 2.

[0021] The support frame 3 is fixedly welded to the top edge of the outer frame 1, and several V-shaped sound-absorbing louvers 4 are installed along the three outer sides of the support frame 3. The side near the fan outlet duct is a solid structure without sound-absorbing louvers 4, and there is a gap between two adjacent sound-absorbing louvers 4 for conveying air.

[0022] The damping plate 6 is locked and fixed with four plates on the outer perimeter of the outer frame 1. The damping plate 6 is made of butyl rubber or nitrile rubber. The first sound insulation plate 7 is provided at the end of the damping plate 6 away from the outer frame 1. The sound insulation top plate 10 is installed on the top surface of the support frame 3. The outer edge of the support frame 3 is located within the vertical projection range of the bottom surface of the sound insulation top plate 10. The sound insulation top plate 10 can not only further improve the sound insulation effect of the fan inlet, but also reduce rainwater entering the silencer 2.

[0023] The soundproof ceiling panel 10 is an upwardly convex V-shaped or arc-shaped structure. In this embodiment, the soundproof ceiling panel 10 is a V-shaped structure.

[0024] In this embodiment, the sound-absorbing plate includes a perforated plate 11 that is vertically locked and fixed inside the muffler 2. The perforated plate 11 has a hollow structure and is filled with a second sound-insulating plate 12. Sound waves can pass more smoothly through the small holes on the perforated plate 11 into the second sound-insulating plate 12 inside, so that the second sound-insulating plate 12 can absorb sound waves and reduce noise.

[0025] In this embodiment, the sound-absorbing louver 4 includes a V-shaped metal perforated plate 41 installed on the outer frame 1. The metal perforated plate 41 is made of hollow aluminum alloy, and a third sound insulation plate 42 is provided inside the metal perforated plate 41.

[0026] In this embodiment, the soundproof top plate 10 includes two aluminum plates 101 and a core rock wool 102 sandwiched between the two aluminum plates 101. The lower aluminum plate 101 is detachably connected to the support frame 3. The soundproof top plate 10 and the support frame 3 together form a small soundproof room above the silencer 2 to block noise from spreading out from the top.

[0027] In this embodiment, the support frame 3 is provided with an inspection port 8, which extends downward to the top of the outer side of the muffler 2. An inspection door 9 is hinged inside the inspection port 8, which makes it easy to enter the inspection port 8 through the inspection door 9 to perform maintenance on the muffler 2.

[0028] In this embodiment, the first sound insulation board 7, the second sound insulation board 12 and the third sound insulation board 42 are all made of sound insulation rock wool;

[0029] In this embodiment, both the outer frame 1 and the support frame 7 are made of stainless steel, and the outer surfaces of both the outer frame 1 and the support frame 7 are coated with epoxy resin to further improve the corrosion resistance of the outer frame 1 and the support frame 7.

[0030] Specifically, during use, the silencer 2 is installed at the air inlet pipe of the boiler fan, and the top surface of the silencer 2 is 1m to 1.5m higher than the air inlet. The first sound insulation plate 7 is connected to the inner wall of the air inlet. The height of the support frame 3 is adjusted according to the air intake needs of the fan to install the corresponding number of sound-absorbing louvers 4, so that the air intake area between each sound-absorbing louver 4 meets the needs of the boiler fan.

[0031] When the boiler fan is in use, noise generated in the air intake duct is further reduced by the silencer 2. The sound passes through the sound-absorbing louvers 4. The V-shaped sound-absorbing louvers 4 can absorb sound through multiple reflections, so that the sound energy continuously passes through the metal perforated plate 41 during propagation and is absorbed by the third sound insulation plate 42 inside, thereby reducing noise and reducing the noise caused by the friction between the air and the air intake duct when the air enters the fan. The sound insulation top plate 10 can also block the noise from propagating out from the top. When the silencer vibrates during operation, the damping plate 6 increases the damping ratio of the system, suppresses the occurrence of resonance, or reduces the amplitude of resonance, thereby reducing the strong vibration and noise caused by resonance. The first sound insulation plate further absorbs noise, further reducing the noise generated during the operation of the boiler fan.

[0032] The above description is merely 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 noise reduction assembly for a fan inlet, characterized in that, include: outer frame; The muffler is installed inside the outer frame, and there are two or more sound-absorbing plates inside the muffler; The support frame is set on the top of the outer frame, and several V-shaped sound-absorbing louvers are installed along the outer perimeter of the support frame. A gap for air supply is provided between two adjacent sound-absorbing louvers. A damping plate is installed on the outer surface of the outer frame, and a first sound insulation plate is provided at the end of the damping plate away from the outer frame. The soundproof ceiling panel is installed on the top surface of the support frame, and the outer edge of the support frame is located within the vertical projection range of the bottom surface of the soundproof ceiling panel.

2. The fan inlet noise reduction assembly according to claim 1, characterized in that: The sound-absorbing plate includes a perforated plate installed vertically inside the muffler. The perforated plate has a hollow structure and is filled with a second sound-insulating plate.

3. The fan inlet noise reduction assembly according to claim 1, characterized in that: A filter screen is installed on the top inner side of the muffler, and the bottom surface of the filter screen completely covers all the sound-absorbing plates.

4. The fan inlet noise reduction assembly according to claim 1, characterized in that: The sound-absorbing louver includes a V-shaped perforated metal plate installed on the outer frame. The perforated metal plate has a hollow structure and a third sound-insulating plate is installed inside the perforated metal plate.

5. The fan inlet noise reduction assembly according to claim 1, characterized in that: The soundproof roof panel includes two aluminum plates and rock wool sandwiched between the two aluminum plates, wherein the lower aluminum plate is detachably connected to the support frame.

6. The fan inlet noise reduction assembly according to claim 1, characterized in that: The support frame has an inspection port that extends downwards to the top of the outer side of the muffler.

7. The fan inlet noise reduction assembly according to claim 6, characterized in that: An inspection door is hinged inside the inspection port.

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