Air outlet barrel capable of reducing noise based on operation of mine fan

Abstract

The utility model relates to the field of air outlet cylinders, in particular to an air outlet cylinder capable of reducing noise based on operation of a mine fan, which comprises an air outlet cylinder, an air supply cover, an external filter screen, a turning cover, a fan, external sound insulation cotton, an impedance silencer, a first built-in double-layer filter screen, a second built-in double-layer filter screen and built-in sound insulation cotton. An external sound insulation cotton wraps the outer side wall of the air outlet cylinder; an overturning cover is mounted at the upper end of the air outlet cylinder; an impedance silencer is mounted below the overturning cover; a first built-in double-layer filter screen and a second built-in double-layer filter screen are mounted in the impedance silencer; the built-in sound insulation cotton is arranged between the air outlet barrel and the impedance silencer, the outer side wall of the air outlet barrel is wrapped with the external sound insulation cotton, and noise can be effectively reduced through the double-layer sound insulation effect.

Description

Technical Field

[0001] This utility model relates to the field of ventilation ducts, specifically to a ventilation duct that can reduce noise during the operation of a mining fan. Background Technology

[0002] In mining production, fans, as key ventilation equipment, play a crucial role in ensuring air circulation and removing harmful gases underground. However, the noise pollution generated by these fans during operation is becoming increasingly prominent. A Chinese patent (authorization announcement number CN 222558807 U) discloses a noise-reducing air duct based on fan operation. This patented technology has the advantages of lower cost and simpler implementation, requiring no large-scale modification of existing fans and ventilation systems. However, its sound insulation effect is suboptimal. Therefore, those skilled in the art have developed a noise-reducing air duct based on mine fan operation to address the problems mentioned in the background. Summary of the Invention

[0003] To solve the above-mentioned technical problems, this utility model provides a noise-reducing air outlet duct based on the operation of a mine ventilation fan, including an air outlet duct, an air supply hood, an external filter, a flip-up hood, a fan, external sound insulation cotton, an impedance silencer, a first built-in double-layer filter, a second built-in double-layer filter, and built-in sound insulation cotton. The air supply hood is concealed on the right side of the air outlet duct, and a fan is installed inside the air supply hood. An external filter is installed on the right side of the air supply hood. The outer wall of the air outlet duct is wrapped with external sound insulation cotton. A flip-up hood is installed at the upper end of the air outlet duct, and an impedance silencer is installed under the flip-up hood. The first and second built-in double-layer filters are installed inside the impedance silencer, and the outside of the impedance silencer is wrapped with built-in sound insulation cotton.

[0004] Preferably: a bracket is installed on the inner side wall of the air supply hood, a fan is installed on the central axis of the bracket, a fixing plate is installed on the right side wall of the air supply hood, the fixing plate and the fixing frame are installed by fixing bolts, and an external filter screen is installed inside the fixing frame;

[0005] Preferably, the air outlet duct is provided with a wind-reducing section and an air outlet section. A first fixing plate is installed on the right side wall of the air outlet section. The first fixing plate and the second fixing plate are installed by fixing bolts. The second fixing plate is installed on the left side of the air supply hood. A first wind-reducing plate and a second wind-reducing plate are installed on the inner side of the wind-reducing section. The first wind-reducing plate and the second wind-reducing plate are installed at a 30° angle and staggered.

[0006] Preferably, the air outlet duct is provided with a movable groove, a rotatable flap is provided in the movable groove, a pull plate is installed at the front end of the flap, a first limiting frame and a second limiting frame are installed on the inner side wall of the air outlet duct, an impedance silencer is installed between the first limiting frame and the second limiting frame, and built-in sound insulation cotton is provided between the air outlet duct and the impedance silencer.

[0007] Preferably, the impedance silencer is provided with a first slot and a second slot at its upper end. A first built-in double-layer filter can be inserted into the first slot, and a second built-in double-layer filter can be inserted into the second slot.

[0008] Preferably, a porous sound-absorbing tube is installed at the center of the inner side of the impedance silencer, and a first partition, a second partition, and a third partition are installed between the inner wall of the impedance silencer and the outer wall of the porous sound-absorbing tube. An expansion chamber is provided between the first partition and the second partition, and an expansion chamber is provided between the second partition and the third partition.

[0009] The technical effects and advantages of this utility model are as follows:

[0010] 1. An expansion chamber is provided between the first and second partitions, and an expansion chamber is provided between the second and third partitions. Sound waves enter the expansion chamber through the porous sound-absorbing pipe. Due to the refraction effect of the inner wall of the expansion chamber, the sound waves propagating along the pipe can be effectively reflected towards the sound source, converting part of the sound energy into the energy consumed to overcome the viscosity force, thus achieving the effect of noise reduction.

[0011] 2. Built-in sound insulation cotton is installed between the air outlet and the impedance silencer, and the outer wall of the air outlet is wrapped with external sound insulation cotton. The double-layer sound insulation can effectively reduce noise.

[0012] 3. The flip-up cover allows for easy maintenance and replacement of internal components. The first slot can be used to insert the first built-in double-layer filter, and the second slot can be used to insert the second built-in double-layer filter. This effectively filters out small impurities inside the device. Combined with the external filter, it effectively protects the normal operation of the internal equipment. Attached Figure Description

[0013] Figure 1 This application provides a schematic diagram of the structure of an exhaust duct that reduces noise during the operation of a mine ventilation fan. Figure 1 ;

[0014] Figure 2 This is a schematic diagram of the structure of an air outlet duct with external filter screen removed, which is based on the noise reduction function of a mine blower, according to an embodiment of this application.

[0015] Figure 3 This application provides a schematic diagram of the structure of an exhaust duct that reduces noise during the operation of a mine ventilation fan. Figure 2 ;

[0016] Figure 4 This is a cross-sectional structural diagram of an air outlet duct that can reduce noise during the operation of a mine fan, provided in an embodiment of this application.

[0017] Figure 5 This is a schematic diagram of the exploded structure of a noise-reducing exhaust duct for a mine ventilation fan, provided in an embodiment of this application. Figure 1 ;

[0018] Figure 6 This is a schematic diagram of the exploded structure of a noise-reducing exhaust duct for a mine ventilation fan, provided in an embodiment of this application. Figure 2 .

[0019] In the diagram: 1. Air outlet; 2. Air supply hood; 3. External filter; 4. Flip-up cover; 5. Fan; 6. External sound insulation cotton; 7. Impedance silencer; 8. First built-in double-layer filter; 9. Second built-in double-layer filter; 10. Built-in sound insulation cotton; 101. Windbreak section; 102. Air outlet section; 103. First fixed plate; 104. First windbreak plate; 105. Second windbreak plate; 106. Movable slot; 107. First limiting bracket; 108. Second limiting bracket; 201. Fixed plate; 202. Bracket; 203. Second fixed plate; 301. Fixed frame; 401. Pull plate; 701. First slot; 702. Second slot; 703. Porous sound-absorbing tube; 704. First partition; 705. Second partition; 706. Third partition. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical applications of the present invention, and to enable those skilled in the art to understand the present invention and design various embodiments with various modifications suitable for a particular purpose. Example

[0021] Please see Figures 1-6 This embodiment provides a noise-reducing air duct based on the operation of a mine fan, including an air duct 1, an air supply hood 2, an external filter 3, a flip cover 4, a fan 5, external sound insulation cotton 6, an impedance silencer 7, a first built-in double-layer filter 8, a second built-in double-layer filter 9, and built-in sound insulation cotton 10. The air supply hood 2 is hidden on the right side of the air duct 1. The fan 5 is installed inside the air supply hood 2. The external filter 3 is installed on the right side of the air supply hood 2. The outer wall of the air duct 1 is wrapped with external sound insulation cotton 6. The flip cover 4 is installed at the upper end of the air duct 1. The impedance silencer 7 is installed under the flip cover 4. The first built-in double-layer filter 8 and the second built-in double-layer filter 9 are installed inside the impedance silencer 7. The outside of the impedance silencer 7 is wrapped with built-in sound insulation cotton 10.

[0022] Specifically, a bracket 202 is installed on the inner wall of the air supply hood 2, and a fan 5 is installed on the central axis of the bracket 202. A fixing plate 201 is installed on the right side wall of the air supply hood 2. The fixing plate 201 and the fixing frame 301 are installed by fixing bolts. An external filter screen 3 is installed inside the fixing frame 301. The air outlet duct 1 is provided with a wind-reducing section 101 and an air outlet section 102. A first fixing plate 103 is installed on the right side wall of the air outlet section 102. The first fixing plate 103 and the second fixing plate 203 are installed by fixing bolts. The second fixing plate 203 is installed on the left side of the air supply hood 2. A first wind-reducing plate 104 and a second wind-reducing plate 105 are installed inside the wind-reducing section 101. The first wind-reducing plate 104 and the second wind-reducing plate 105 are installed at a 30° angle and staggered. The air outlet duct 1 is provided with a movable groove 106. A rotatable flip cover 4 is installed in the movable groove 106. A pull plate 40 is installed at the front end of the flip cover 4. 1. A first limiting frame 107 and a second limiting frame 108 are installed on the inner side wall of the air outlet duct 1. An impedance silencer 7 is installed between the first limiting frame 107 and the second limiting frame 108. An internal sound insulation cotton 10 is provided between the air outlet duct 1 and the impedance silencer 7. A first slot 701 and a second slot 702 are provided at the upper end of the impedance silencer 7. A first internal double-layer filter 8 can be inserted into the first slot 701, and a second internal double-layer filter 9 can be inserted into the second slot 702. A porous sound-absorbing tube 703 is installed at the center of the inner side of the impedance silencer 7. A first partition 704, a second partition 705 and a third partition 706 are installed between the inner side wall of the impedance silencer 7 and the outer side wall of the porous sound-absorbing tube 703. An expansion chamber is provided between the first partition 704 and the second partition 705, and an expansion chamber is provided between the second partition 705 and the third partition 706.

[0023] The working principle of this utility model is as follows:

[0024] An expansion chamber is used in a mine ventilation fan noise reduction system. An expansion chamber is located between the first partition 704 and the second partition 705, and between the second partition 705 and the third partition 706. Sound waves enter the expansion chamber through the porous sound-absorbing pipe 703. Refraction by the inner wall of the expansion chamber effectively reflects the sound waves propagating along the pipe towards the sound source, achieving noise reduction. An internal sound-insulating cotton 10 is installed between the ventilation duct 1 and the impedance silencer 7. An external sound-insulating cotton 6 is wrapped around the outer wall of the ventilation duct 1. This double-layer sound insulation effectively reduces noise. The flip cover 4 allows for easy maintenance and replacement of internal components. A first internal double-layer filter 8 can be inserted into the first slot 701, and a second internal double-layer filter 9 can be inserted into the second slot 702. These effectively filter out small impurities inside the ventilation system. Combined with the external filter 3, this effectively protects the normal operation of the internal equipment.

[0025] Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of this utility model without creative effort should fall within the protection scope of this utility model. Structures, devices, and operating methods not specifically described and explained in this utility model, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. A noise-reducing air duct for mine ventilation fans, characterized in that, It includes an air outlet duct (1), an air supply hood (2), an external filter (3), a flip cover (4), a fan (5), external sound insulation cotton (6), an impedance silencer (7), a first built-in double-layer filter (8), a second built-in double-layer filter (9), and built-in sound insulation cotton (10). The air supply hood (2) is hidden on the right side of the air outlet duct (1). The fan (5) is installed inside the air supply hood (2). The external filter (3) is installed on the right side of the air supply hood (2). The external sound insulation cotton (6) is wrapped around the outer wall of the air outlet duct (1). The flip cover (4) is installed at the upper end of the air outlet duct (1). The impedance silencer (7) is installed under the flip cover (4). The first built-in double-layer filter (8) and the second built-in double-layer filter (9) are installed inside the impedance silencer (7). The built-in sound insulation cotton (10) is wrapped around the outside of the impedance silencer (7).

2. The ventilation duct for noise reduction based on the operation of a mine ventilation fan as described in claim 1, characterized in that, The inner wall of the air supply hood (2) is fitted with a bracket (202), a fan (5) is mounted on the central axis of the bracket (202), a fixing plate (201) is mounted on the right side wall of the air supply hood (2), the fixing plate (201) and the fixing frame (301) are mounted by fixing bolts, and an external filter screen (3) is installed inside the fixing frame (301).

3. The air outlet duct for noise reduction based on the operation of a mine ventilation fan as described in claim 1, characterized in that, The air outlet duct (1) is provided with a slow air section (101) and an air outlet section (102). A first fixing plate (103) is installed on the right side wall of the air outlet section (102). The first fixing plate (103) and the second fixing plate (203) are installed by fixing bolts. The second fixing plate (203) is installed on the left side of the air supply hood (2).

4. The air outlet duct for noise reduction based on the operation of a mine ventilation fan as described in claim 3, characterized in that, The first wind-reducing plate (104) and the second wind-reducing plate (105) are installed on the inner side of the wind-reducing section (101), and the first wind-reducing plate (104) and the second wind-reducing plate (105) are installed at a 30° angle to each other.

5. A noise-reducing air duct based on the operation of a mine ventilation fan according to claim 3, characterized in that, The air outlet duct (1) is provided with a movable groove (106), and a rotatable flap (4) is provided in the movable groove (106). A pull plate (401) is installed at the front end of the flap (4).

6. A noise-reducing air duct based on the operation of a mine ventilation fan according to claim 5, characterized in that, The air outlet duct (1) is equipped with a first limiting frame (107) and a second limiting frame (108) on its inner side wall. An impedance silencer (7) is installed between the first limiting frame (107) and the second limiting frame (108). An internal sound insulation cotton (10) is provided between the air outlet duct (1) and the impedance silencer (7).

7. A noise-reducing air duct based on the operation of a mine ventilation fan according to claim 6, characterized in that, The impedance silencer (7) is provided with a first slot (701) and a second slot (702) at the upper end. A first built-in double-layer filter (8) can be inserted into the first slot (701), and a second built-in double-layer filter (9) can be inserted into the second slot (702).

8. A noise-reducing air duct based on the operation of a mine ventilation fan according to claim 7, characterized in that, A porous sound-absorbing tube (703) is installed at the center of the inner side of the impedance silencer (7). A first partition (704), a second partition (705), and a third partition (706) are installed between the inner wall of the impedance silencer (7) and the outer wall of the porous sound-absorbing tube (703). An expansion chamber is provided between the first partition (704) and the second partition (705), and an expansion chamber is provided between the second partition (705) and the third partition (706).

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