A coal mine underground ventilator noise reduction device

Abstract

The utility model discloses a coal mine underground ventilator noise reduction device relates to underground ventilation noise reduction technical field, including the noise reduction cover, the hanger, the motion silencer and the light sound deadening ball, the noise reduction cover cover is located in the ventilator air intake pipe end part, and the noise reduction cover includes the sound collection cover of cover and the sound deadening ball cover of integral forming with sound collection cover, and the hanger lower extreme is fixed with the sound collection cover periphery side, and the hanger upper extreme is fixed in the mine tunnel top, and the motion silencer rotates and is installed in the sound collection cover inboard, and the light sound deadening ball activity hoist is in the sound deadening ball cover inner top, and motion silencer and light sound deadening ball all are driven to produce the movement by noise, the utility model discloses a through the setting of noise reduction cover, motion silencer and light sound deadening ball can convert acoustic energy into mechanical energy to realize the noise reduction, and simultaneously need not use water to absorb the noise reduction, also avoided the corrosion that water caused to the noise reduction device, and therefore the subsequent maintenance frequency is lower, and the practicality is stronger.

Description

Technical Field

[0001] This utility model relates to the field of underground ventilation and noise reduction technology, and in particular to a noise reduction device for underground ventilation fans in coal mines. Background Technology

[0002] High-intensity noise pollution in coal mines can cause specific and non-specific harm to the health of underground workers, and can also directly or indirectly lead to various accidents, creating hidden dangers for safe production in the mine. The largest noise output of ventilation fans is at the air inlet and air outlet.

[0003] A search revealed a local ventilation fan noise reduction device in patent document CN218971509U. The device includes a cuboid support frame and multiple water tanks. The water tanks are vertically distributed and each has an opening at its top. Each water tank has a row of hanging holes along the upper edge of its two sides along its length. Multiple horizontal supports, also vertically distributed and along the length of the cuboid support frame, are fixedly connected to the cuboid support frame. Each horizontal support and the two bottom supports of the cuboid support frame along the length of the cuboid support frame are fixed with a row of U-shaped hooks. This device is simple to manufacture, easy to install, and provides good noise reduction.

[0004] Based on the above search and combined with existing technology, it was found that existing noise reduction devices for underground ventilation fans in coal mines use water as a sound-absorbing medium. However, water is prone to corrosion of the water tank during use, and the water will also vibrate due to absorbing noise. Vibration will accelerate the evaporation of water, leading to water loss. Water needs to be added regularly to maintain a continuous noise reduction effect, which is inconvenient to use. Therefore, a noise reduction device for underground ventilation fans in coal mines is needed. Utility Model Content

[0005] The purpose of this application is to provide a noise reduction device for underground ventilation fans in coal mines to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this application provides the following technical solution: a noise reduction device for underground ventilation fans in coal mines, comprising:

[0007] The noise reduction cover is installed at the end of the air inlet pipe of the ventilator. The noise reduction cover includes a sound collection cover installed at the end of the air inlet pipe of the ventilator and a sound-absorbing ball cover integrally formed with the sound collection cover. The sound collection cover is horn-shaped, and the diameter of the end of the sound collection cover near the air inlet pipe of the ventilator is larger than the diameter of the end of the sound collection cover away from the air inlet pipe of the ventilator.

[0008] The lower end of the bracket is fixed to the periphery of the sound collector cover, and the upper end of the bracket is fixed to the top of the mine tunnel.

[0009] A moving noise-reducing component is rotatably installed inside the sound-collecting cover.

[0010] Lightweight sound-absorbing ball, which is movably suspended at the top inside the sound-absorbing ball cover;

[0011] Both the moving noise-absorbing components and the lightweight noise-absorbing balls are driven by noise to move.

[0012] As a further improvement to this solution, the moving noise reduction component includes a rotating shaft and a noise reduction blade. The rotating shaft is rotatably embedded inside the sound collection cover, and the noise reduction blade is fixed to the rotating shaft. The noise reduction blade is an irregular fan-shaped plate, and the noise reduction blade is set perpendicular to the inner wall of the sound collection cover. The rotation angle of the noise reduction blade is 30°-90°.

[0013] As a further improvement to this solution, multiple moving noise reduction components are installed. These multiple moving noise reduction components are distributed along the central circumference of the sound collection cover, and multiple moving noise reduction components form multiple layers along the inner wall of the sound collection cover. The multiple layers of moving noise reduction components are staggered in the horizontal direction.

[0014] As a further improvement to this solution, lightweight silencing balls are suspended from the top of the silencing ball cover by ropes. Multiple lightweight silencing balls are also provided, and they are irregularly distributed along the top of the silencing ball cover. The distance between two adjacent lightweight silencing balls is more than twice the length of the rope.

[0015] As a further improvement to this solution, a second sound-absorbing pad layer adapted to the shape of the sound-collecting cover is fixed inside the sound-collecting cover, and a first sound-absorbing pad layer adapted to the shape of the sound-absorbing sphere is fixed inside the sound-absorbing sphere. The first sound-absorbing pad layer and the second sound-absorbing pad layer are integrally formed.

[0016] As a further improvement to this solution, a first sound-absorbing plate and a second sound-absorbing plate are fixed on the inner side of one end of the sound-collecting cover outside the air inlet pipe of the ventilator. The first sound-absorbing plate and the second sound-absorbing plate are both arranged around the outside of the air inlet pipe of the ventilator and are spaced apart. A first through hole is opened on the first sound-absorbing plate and a second through hole is opened on the second sound-absorbing plate. The first through hole and the second through hole are staggered in the horizontal direction.

[0017] In summary, the technical effects and advantages of this utility model are as follows:

[0018] 1. In this utility model, by setting up a noise reduction cover, a moving sound-absorbing component, and a lightweight sound-absorbing ball, the moving sound-absorbing component is driven by noise to move, thereby converting sound energy into mechanical energy, thus achieving noise reduction. At the same time, the noise is concentrated and transmitted into the sound-absorbing ball cover. After entering the sound-absorbing ball cover, the noise is repeatedly refracted inside the cover and drives the lightweight sound-absorbing ball to move, thereby further weakening the noise and achieving a good noise reduction effect. Moreover, there is no need to use water to absorb noise reduction, and water is avoided from corroding the noise reduction device. Therefore, the subsequent maintenance frequency is lower and the practicality is stronger.

[0019] 2. In this utility model, by setting the first sound-absorbing plate and the second sound-absorbing plate, when the outside air enters the air inlet pipe of the ventilator, it first passes through the first through hole and the second through hole. While ensuring that the air enters the air inlet pipe of the ventilator smoothly, the curved air flow channel can reduce the air velocity at that point, thereby reducing the noise generated when the air enters the air inlet pipe of the ventilator and achieving the purpose of initial noise reduction.

[0020] When noise generated at the end of the ventilator's air inlet duct radiates outward, the first and second sound-absorbing panels can intercept the overflowing noise reflected by the sound collection cover, thus absorbing and reducing the noise, achieving a more comprehensive noise reduction effect and improving noise reduction performance.

[0021] 3. In this utility model, by setting the first sound-absorbing pad and the second sound-absorbing pad, the noise entering the sound collection cover and the sound-absorbing ball cover can be further absorbed and eliminated, thereby achieving a better sound absorption effect in conjunction with the moving sound-absorbing component and the lightweight sound-absorbing ball. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the three-dimensional structure in this embodiment;

[0024] Figure 2 This is a cross-sectional view in this embodiment;

[0025] Figure 3 This is a side view of the embodiment where the first sound-absorbing panel and the second sound-absorbing panel are hidden;

[0026] Figure 4 This is a schematic diagram of the structure of the first sound-absorbing panel and the second sound-absorbing panel in this embodiment.

[0027] In the diagram: 1. Noise reduction cover; 11. Sound collection cover; 12. Silencing ball cover; 2. Hanging bracket; 3. Moving silencer component; 31. Rotating shaft; 32. Silencing blade; 4. Lightweight silencer ball; 41. Suspension rope; 5. First sound-absorbing pad; 6. Second sound-absorbing pad; 7. First sound-absorbing panel; 71. First through hole; 8. Second sound-absorbing panel; 81. Second through hole; 9. Ventilation fan inlet duct. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Example: Reference Figures 1-4 The noise reduction device for underground ventilation fans in coal mines shown includes a noise reduction cover 1, a hanging frame 2, a moving sound-absorbing component 3, and a lightweight sound-absorbing ball 4;

[0030] The noise reduction cover 1 is installed at the end of the ventilation fan inlet pipe 9. The noise reduction cover 1 includes a sound collection cover 11 installed at the end of the ventilation fan inlet pipe 9 and a sound-absorbing ball cover 12 integrally formed with the sound collection cover 11. The sound collection cover 11 is horn-shaped, and the diameter of the end of the sound collection cover 11 near the ventilation fan inlet pipe 9 is larger than the diameter of the end of the sound collection cover 11 away from the ventilation fan inlet pipe 9.

[0031] The lower end of the bracket 2 is fixed to the periphery of the sound collection cover 11, and the upper end of the bracket 2 is fixed to the top of the mine tunnel. The moving sound-absorbing component 3 is rotatably installed inside the sound collection cover 11, and the lightweight sound-absorbing ball 4 is movably suspended inside the top of the sound-absorbing ball cover 12. Both the moving sound-absorbing component 3 and the lightweight sound-absorbing ball 4 are driven by noise to move.

[0032] Based on the above structure, when the air inlet duct 9 of the ventilator generates noise, the noise radiates outward and is blocked by the sound collection cover 11. The inner wall of the sound collection cover 11 reflects and concentrates the noise. During this process, the moving silencer 3 is driven by the noise to move, thereby converting sound energy into mechanical energy, thus achieving noise reduction. At the same time, the noise is concentrated and transmitted into the silencer ball cover 12. After entering the silencer ball cover 12, the noise is repeatedly refracted inside the silencer ball cover 12 and drives the lightweight silencer ball 4 to move, thereby weakening the noise again and achieving a good noise reduction effect. Moreover, there is no need to use water to absorb noise reduction, and water is avoided from corroding the noise reduction device. Therefore, the subsequent maintenance frequency is lower and the practicality is stronger.

[0033] Furthermore, the motion silencing component 3 includes a rotating shaft 31 and a sound-absorbing curved blade 32. The rotating shaft 31 is rotatably embedded inside the sound collection cover 11, and the sound-absorbing curved blade 32 is fixed to the rotating shaft 31. The sound-absorbing curved blade 32 is an irregular fan-shaped plate. The sound-absorbing curved blade 32 is perpendicular to the inner wall of the sound collection cover 11, and the rotation angle of the sound-absorbing curved blade 32 is 30°-90°.

[0034] Multiple moving noise-reducing components 3 are installed, and the multiple moving noise-reducing components 3 are distributed along the central circumference of the sound collection cover 11. The multiple moving noise-reducing components 3 form multiple layers along the inner wall of the sound collection cover 11, and the multiple layers of moving noise-reducing components 3 are staggered in the horizontal direction.

[0035] When noise propagates within the sound-collecting enclosure 11, the sound energy drives the sound-absorbing curved blades 32 to rotate along the shaft 31, thereby converting the sound energy into mechanical kinetic energy, achieving the purpose of consuming sound energy and reducing noise. Furthermore, the multiple moving sound-absorbing components 3 are arranged in a multi-layered, staggered manner, making the consumption of sound energy more effective and greatly reducing the probability of resonance when the multiple moving sound-absorbing components 3 are in motion, thus reducing the possibility of secondary noise generation and achieving a good and reliable noise reduction effect.

[0036] Furthermore, the lightweight silencing balls 4 are suspended from the top of the silencing ball cover 12 by the suspension rope 41. Multiple lightweight silencing balls 4 are also provided, and the multiple lightweight silencing balls 4 are irregularly distributed along the top of the silencing ball cover 12. The distance between two adjacent lightweight silencing balls 4 is more than twice the length of the suspension rope 41. In this way, multiple lightweight silencing balls 4 can be used to conduct secondary interference on the noise inside the silencing ball cover 12, thereby further achieving a good noise reduction effect.

[0037] Furthermore, a second sound-absorbing pad 6 adapted to the shape of the sound-collecting cover 11 is fixed inside the sound-collecting cover 11, and a first sound-absorbing pad 5 adapted to the shape of the sound-absorbing ball cover 12 is fixed inside the sound-absorbing ball cover 12. The first sound-absorbing pad 5 and the second sound-absorbing pad 6 are integrally formed.

[0038] By setting the first sound-absorbing pad 5 and the second sound-absorbing pad 6, the noise entering the sound collection cover 11 and the sound-absorbing ball cover 12 can be further absorbed and eliminated, thereby achieving a better sound absorption effect in conjunction with the moving sound-absorbing component 3 and the lightweight sound-absorbing ball 4.

[0039] Furthermore, the sound-collecting cover 11 is fixed to the inner side of one end of the fan inlet pipe 9, with a first sound-absorbing plate 7 and a second sound-absorbing plate 8. The first sound-absorbing plate 7 and the second sound-absorbing plate 8 are both arranged around the outside of the fan inlet pipe 9 and spaced apart. The first sound-absorbing plate 7 has a first through hole 71 and the second sound-absorbing plate 8 has a second through hole 81. The first through hole 71 and the second through hole 81 are staggered in the horizontal direction.

[0040] By setting the first sound-absorbing plate 7 and the second sound-absorbing plate 8, when outside air enters the ventilator inlet pipe 9, it first passes through the first through hole 71 and the second through hole 81. While ensuring that the air enters the ventilator inlet pipe 9 smoothly, the curved airflow channel can reduce the air velocity at that point, thereby reducing the noise generated when the air enters the ventilator inlet pipe 9 and achieving the purpose of initial noise reduction.

[0041] When the noise generated at the end of the ventilator inlet duct 9 radiates outward, the first sound-absorbing plate 7 and the second sound-absorbing plate 8 can intercept the overflow noise reflected by the sound collection cover 11, so that the noise is absorbed and reduced, achieving a more comprehensive noise reduction effect and improving noise reduction performance.

[0042] It should be further explained that the sound-absorbing curved blade 32, the lightweight sound-absorbing ball 4, the first sound-absorbing pad 5, the second sound-absorbing pad 6, the first sound-absorbing board 7, and the second sound-absorbing board 8 are all made of sound-absorbing materials in the existing technology. For example, the sound-absorbing curved blade 32, the lightweight sound-absorbing ball 4, the first sound-absorbing board 7, and the second sound-absorbing board 8 can be made of rigid polyester fiber sound-absorbing cotton or NS-Ⅲ rigid inorganic fiber thermal insulation and sound-absorbing decorative material, while the first sound-absorbing pad 5 and the second sound-absorbing pad 6 can be made of fabric sound-absorbing soft packs or open-cell foam plastic, etc., to meet the needs of sound absorption and noise reduction.

[0043] The working principle of this utility model is as follows: In daily use, when outside air enters the air inlet pipe 9 of the ventilator, it first passes through the first through hole 71 and the second through hole 81. While ensuring that the air enters the air inlet pipe 9 of the ventilator smoothly, the curved airflow channel can reduce the air velocity at that point, thereby reducing the noise generated when the air enters the air inlet pipe 9 of the ventilator and achieving the purpose of initial noise reduction.

[0044] When the ventilation fan inlet duct 9 generates noise, the noise radiates outward and is blocked by the sound collection cover 11. The inner wall of the sound collection cover 11 reflects and concentrates the noise. The first sound-absorbing plate 7 and the second sound-absorbing plate 8 can intercept the overflow noise reflected by the sound collection cover 11, so that the noise is absorbed and reduced. During this process, the moving silencer 3 is driven by the noise to move, thereby converting sound energy into mechanical energy, thereby achieving noise reduction. At the same time, the noise is concentrated and transmitted into the silencer ball cover 12. After the noise enters the silencer ball cover 12, it is repeatedly refracted in the silencer ball cover 12 and drives the lightweight silencer ball 4 to move, thereby weakening the noise again.

[0045] In addition, the first sound-absorbing pad 5 and the second sound-absorbing pad 6 can further absorb and eliminate noise entering the sound collection cover 11 and the sound-absorbing ball cover 12, thereby achieving a better sound-absorbing effect in conjunction with the moving sound-absorbing component 3 and the lightweight sound-absorbing ball 4.

[0046] 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 noise reduction device for underground ventilation fans in coal mines, characterized in that, include: Noise reduction cover (1), the noise reduction cover (1) is installed on the end of the air inlet pipe (9) of the ventilator, the noise reduction cover (1) includes a sound collection cover (11) installed on the end of the air inlet pipe (9) of the ventilator and a sound-absorbing ball cover (12) integrally formed with the sound collection cover (11). The sound collection cover (11) is horn-shaped, and the diameter of the end of the sound collection cover (11) close to the air inlet pipe (9) of the ventilator is larger than the diameter of the end of the sound collection cover (11) away from the air inlet pipe (9) of the ventilator. Hanging frame (2), the lower end of the hanging frame (2) is fixed to the periphery of the sound collecting cover (11), and the upper end of the hanging frame (2) is fixed to the top of the mine tunnel; A motion-activated noise reduction component (3) is rotatably mounted inside the sound collection cover (11); Lightweight sound-absorbing ball (4), which is movably suspended at the top inside the sound-absorbing ball cover (12); Both the motion silencing component (3) and the lightweight silencing ball (4) are driven by noise to move.

2. The noise reduction device for underground ventilation fans in coal mines according to claim 1, characterized in that: The motion-activated noise reduction component (3) includes a rotating shaft (31) and a noise reduction louver (32). The rotating shaft (31) is rotatably embedded inside the sound collection cover (11). The noise reduction louver (32) is fixed to the rotating shaft (31). The noise reduction louver (32) is an irregular fan-shaped plate. The noise reduction louver (32) is perpendicular to the inner wall of the sound collection cover (11), and the rotation angle of the noise reduction louver (32) is 30°-90°.

3. The noise reduction device for underground ventilation fans in coal mines according to claim 2, characterized in that: Multiple moving noise-absorbing components (3) are installed, and the multiple moving noise-absorbing components (3) are distributed around the central axis of the sound-collecting cover (11). The multiple moving noise-absorbing components (3) form multiple layers along the inner wall of the sound-collecting cover (11), and the multiple layers of moving noise-absorbing components (3) are staggered in the horizontal direction.

4. The noise reduction device for underground ventilation fans in coal mines according to claim 2, characterized in that: The lightweight silencing ball (4) is suspended at the top of the silencing ball cover (12) by a hanging rope (41). There are multiple lightweight silencing balls (4). The multiple lightweight silencing balls (4) are irregularly distributed along the top of the silencing ball cover (12). The distance between two adjacent lightweight silencing balls (4) is greater than twice the length of the hanging rope (41).

5. The noise reduction device for underground ventilation fans in coal mines according to claim 1, characterized in that: The sound collecting cover (11) is fixed with a second sound-absorbing pad (6) that is adapted to the shape of the sound collecting cover (11), and the sound-absorbing ball cover (12) is fixed with a first sound-absorbing pad (5) that is adapted to the shape of the sound-absorbing ball cover (12). The first sound-absorbing pad (5) and the second sound-absorbing pad (6) are integrally formed.

6. A noise reduction device for underground ventilation fans in coal mines according to any one of claims 1-5, characterized in that: The sound-collecting cover (11) is fixed to the inner side of one end of the fan inlet pipe (9) with a first sound-absorbing plate (7) and a second sound-absorbing plate (8). The first sound-absorbing plate (7) and the second sound-absorbing plate (8) are both arranged around the outside of the fan inlet pipe (9) and spaced apart. The first sound-absorbing plate (7) has a first through hole (71) and the second sound-absorbing plate (8) has a second through hole (81). The first through hole (71) and the second through hole (81) are staggered in the horizontal direction.

Images