Mine ventilator with shock-absorbing and noise-reducing functions

Abstract

The utility model discloses a mine ventilator with shock attenuation and noise reduction function relates to ventilator noise reduction technical field, including ventilator, with the damper silencer pipe of ventilator air inlet fixed and intercommunication, and the inside diameter of one end of damper silencer pipe and ventilator air inlet connection is less than the inside diameter of the other end, the one end of damper silencer pipe away from ventilator air inlet is fixed with the air intake hopper, and the air intake hopper is fixed in the inside of damper silencer pipe, and the air intake hopper is in the shape of a bucket, and the inside of air intake hopper is fixed with the outside sound elimination layer, the rotation is connected with the shaft on damper silencer pipe, and the shaft one end extends to damper silencer pipe inside and is fixed with the driven impeller, and the driven impeller rotates with the airflow movement in damper silencer pipe, the utility model discloses the setting of damper silencer pipe, air intake hopper, shaft, disturbance silencer spare and driven impeller can reach the purpose of reducing noise through directly interfering with the vibration, sound wave resonance at damper silencer pipe place, can effectively weaken the noise, reaches the good sound elimination and noise reduction effect.

Description

Technical Field

[0001] This utility model relates to the field of ventilation fan noise reduction technology, and in particular to a mine ventilation fan with vibration reduction and noise reduction functions. 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 the above-mentioned similar mine ventilation fans with vibration reduction and noise reduction functions can reduce the noise already emitted by the ventilation fan. Although they can achieve a certain noise reduction effect, a large amount of noise still exists at the air inlet of the ventilation fan. The effect of eliminating the noise source is not good. Therefore, a mine ventilation fan with vibration reduction and noise reduction functions is needed. Utility Model Content

[0005] The purpose of this application is to provide a mine ventilation fan with vibration reduction and noise reduction functions to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this application provides the following technical solution: a mine ventilation fan with vibration reduction and noise reduction function, including a ventilation fan and a damping silencer pipe fixed and connected to the air inlet of the ventilation fan, wherein the inner diameter of one end of the damping silencer pipe connected to the air inlet of the ventilation fan is smaller than the inner diameter of the other end.

[0007] An air inlet hopper is fixed at the end of the damping silencer pipe away from the air inlet of the ventilator. The air inlet hopper is fixed inside the damping silencer pipe and is bucket-shaped. An outer sound-absorbing layer is fixed inside the air inlet hopper.

[0008] A rotating shaft is rotatably connected to the damping silencer. One end of the shaft extends into the damping silencer and is fixed with a driven impeller. The driven impeller rotates with the airflow inside the damping silencer. The other end of the shaft is located outside the damping silencer and is fixedly installed with a vibration damping component. When the vibration damping component rotates, it generates an eccentric force, which is transmitted to the damping silencer through the rotating shaft.

[0009] Preferably, the vibration damping component includes a connecting ring and a vibration damping rod. The connecting ring is fixedly sleeved on the rotating shaft, one end of the vibration damping rod is fixed to the periphery of the connecting ring, and the other end of the vibration damping rod is integrally formed with a vibration damping ball.

[0010] Preferably, at least two vibration damping rods are provided, and the at least two vibration damping rods are irregularly distributed along the circumference of the connecting ring, and the center of gravity of the distribution of the at least two vibration damping rods is deviated from the axis of the connecting ring.

[0011] Preferably, the portion of the rotating shaft located inside the damping silencer tube and the driven impeller are both located on one side of the damping silencer tube, and the axis of the rotating shaft is offset from the axis of the damping silencer tube.

[0012] Preferably, multiple sets of rotating shafts, vibration damping components, and driven impellers are provided. These multiple sets of rotating shafts, vibration damping components, and driven impellers are distributed circumferentially along the axis of the damping silencer pipe, and are arranged sequentially along the axial extension direction of the damping silencer pipe.

[0013] Preferably, the blades of the multiple driven impellers are of different sizes, and all the driven impellers are made of sound-absorbing material.

[0014] Preferably, a connecting pipe is integrally formed at one end of the damping silencer pipe near the air inlet of the ventilator. The connecting pipe is fixed and connected to the air inlet of the ventilator through a flange structure. An inner silencer pipe is fixed inside the damping silencer pipe. Both the damping silencer pipe and the inner silencer pipe are provided with through holes for the rotating shaft to pass through.

[0015] The air intake hopper includes a main hopper body, the outer periphery of which is fixed to the inner side of the damping silencer pipe, an outer silencer layer is fixedly embedded in the inner side of the main hopper body, and an inner silencer layer is fixedly embedded in the outer side of the main hopper body. The inner silencer layer is located inside the damping silencer pipe.

[0016] In summary, the technical effects and advantages of this utility model are as follows:

[0017] 1. In this utility model, through the arrangement of a damping silencer pipe, an air inlet hopper, a rotating shaft, a vibration damping component, and a driven impeller, airflow enters the damping silencer pipe from the air inlet hopper. The outer sound-absorbing layer can initially eliminate noise during air intake. After the airflow enters the damping silencer pipe, because the inner diameter of the damping silencer pipe is larger than the inner diameter of the air inlet hopper, the air pressure in the middle of the damping silencer pipe decreases, forming a slow flow, thereby further reducing noise. At the same time, the passing airflow blows the driven impeller, and when the driven impeller rotates, it drives the vibration damping component through the rotating shaft. When the component rotates, the vibration damping component generates an eccentric force, which is transmitted to the damping muffler tube through the rotating shaft. This interferes with the vibration of the damping muffler tube and disrupts the refraction of sound waves within it, thereby reducing the probability of sound resonance within the muffler tube. Weakening or eliminating the vibration of the damping muffler tube can also reduce noise generation. In this way, noise reduction can be achieved by directly interfering with the vibration and sound wave resonance at the damping muffler tube, effectively weakening noise and achieving a good noise reduction effect.

[0018] 2. In this utility model, by setting up multiple sets of rotating shafts, vibration damping components, and driven impellers, and distributing these components circumferentially along the axis of the damping silencer, the system can interfere with the damping silencer and the sound waves within it at multiple locations. Furthermore, the driven impellers of different sizes rotate at different speeds as they rotate with the airflow, resulting in varying eccentric forces generated by the multiple vibration damping components. This leads to different interference effects on the damping silencer and the sound waves within it at different locations. This avoids resonance caused by the same eccentric force on multiple rotating shafts, while achieving a better noise reduction effect with a wider range of interference vibration frequencies, resulting in superior performance. Attached Figure Description

[0019] 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.

[0020] Figure 1 This is a schematic diagram of the three-dimensional structure in this embodiment;

[0021] Figure 2 This is a cross-sectional view of the air inlet hopper, vibration damping and noise reduction components, and driven impeller hidden in this embodiment.

[0022] Figure 3 This is a side view of the structure when the air inlet hopper is hidden in this embodiment.

[0023] In the diagram: 1. Damping silencer pipe; 11. Connecting pipe; 12. Perforation; 13. Inner silencer pipe; 2. Air inlet hopper; 21. Main hopper body; 22. Outer silencer layer; 23. Inner silencer layer; 3. Rotating shaft; 4. Vibration damping silencer component; 41. Connecting ring; 42. Vibration damping rod; 421. Vibration damping ball; 5. Driven impeller. Detailed Implementation

[0024] 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.

[0025] Example: Reference Figures 1-3 The mine ventilation fan shown has vibration reduction and noise reduction functions, including a ventilation fan (a ventilation fan commonly used in the prior art and applicable to this embodiment can be used, such as FKCDZ-6-NO20 / 2×160kW energy-saving ventilation fan), a damping silencer pipe 1 fixed and connected to the air inlet of the ventilation fan, wherein the inner diameter of one end of the damping silencer pipe 1 connected to the air inlet of the ventilation fan is smaller than the inner diameter of the other end.

[0026] An air inlet hopper 2 is fixed at the end of the damping silencer duct 1 away from the air inlet of the ventilator. The air inlet hopper 2 is fixed inside the damping silencer duct 1. The air inlet hopper 2 is bucket-shaped. An outer sound-absorbing layer 22 is fixed inside the air inlet hopper 2.

[0027] A rotating shaft 3 is rotatably connected to the damping silencer 1. One end of the rotating shaft 3 extends into the damping silencer 1 and is fixed with a driven impeller 5. The driven impeller 5 rotates with the airflow in the damping silencer 1. The other end of the rotating shaft 3 is located outside the damping silencer 1 and is fixedly installed with a vibration damping component 4. When the vibration damping component 4 rotates, it generates an eccentric force. The eccentric force of the vibration damping component 4 is transmitted to the damping silencer 1 through the rotating shaft 3.

[0028] Based on the above structure, when the ventilator intakes air, the airflow enters the damping silencer duct 1 from the air inlet hopper 2. The outer silencer layer 22 can initially eliminate the noise during air intake. After the airflow enters the damping silencer duct 1, because the inner diameter of the damping silencer duct 1 is larger than the inner diameter of the air inlet hopper 2, the air pressure in the middle of the damping silencer duct 1 decreases, forming a slow flow, which can further reduce noise. At the same time, the passing airflow blows the driven impeller 5. When the driven impeller 5 rotates, it drives the vibration damping silencer 4 to rotate through the rotating shaft 3. When the vibration damping silencer 4 rotates, it generates an eccentric force, which is then transmitted through... The sound is transmitted through the rotating shaft 3 to the damping silencer 1, thereby interfering with the vibration of the damping silencer 1 (based on the principle of vibration reduction and noise reduction in the existing technology, directly weakening the noise source generated by vibration), and disrupting the refraction of sound waves in the damping silencer 1, thereby reducing the probability of sound resonance in the damping silencer 1. Weakening or eliminating the vibration of the damping silencer 1 can also reduce the noise generation effect. In this way, the noise reduction purpose can be achieved by directly interfering with the vibration and sound wave resonance at the damping silencer 1, which can effectively weaken the noise and achieve a good noise reduction effect.

[0029] Furthermore, the vibration damping component 4 includes a connecting ring 41 and a vibration damping rod 42. The connecting ring 41 is fixedly sleeved on the rotating shaft 3. One end of the vibration damping rod 42 is fixed to the periphery of the connecting ring 41, and the other end of the vibration damping rod 42 is integrally formed with a vibration damping ball 421.

[0030] At least two vibration damping rods 42 are provided, and the at least two vibration damping rods 42 are irregularly distributed along the circumference of the connecting ring 41, and the center of gravity of the distribution of the at least two vibration damping rods 42 is deviated from the axis of the connecting ring 41.

[0031] By setting up the connecting ring 41 and the vibration damping rod 42, and cooperating with the design of the vibration damping ball 421, the vibration damping rod 42 can cause the connecting ring 41 to generate an eccentric force (centrifugal force) that deviates from the axis of the rotating shaft 3 when it rotates. This eccentric force is transmitted to the damping silencer tube 1 through the rotating shaft 3, thereby achieving the purpose of using the eccentric force to disturb the vibration of the damping silencer tube 1 and the refraction and propagation of sound waves inside the damping silencer tube 1, and finally achieving a good noise reduction effect.

[0032] Furthermore, the portion of the rotating shaft 3 located inside the damping silencer 1 and the driven impeller 5 are both located on one side of the damping silencer 1, and the axis of the rotating shaft 3 is offset from the axis of the damping silencer 1.

[0033] Multiple sets of rotating shaft 3, vibration damping component 4, and driven impeller 5 are provided. These multiple sets of rotating shaft 3, vibration damping component 4, and driven impeller 5 are distributed circumferentially along the axis of the damping silencer pipe 1, and are arranged sequentially along the extension direction of the axis of the damping silencer pipe 1.

[0034] The multiple driven impellers 5 have different blade sizes, and all of the driven impellers 5 are made of sound-absorbing materials.

[0035] By setting up multiple sets of rotating shafts 3, vibration damping components 4, and driven impellers 5, and distributing these components circumferentially along the axis of the damping silencer 1, interference can be generated at multiple locations within the damping silencer 1 and the sound waves therein. Simultaneously, the driven impellers 5, being of different sizes, rotate at different speeds as they rotate with the airflow, resulting in varying eccentric forces generated by the multiple vibration damping components 4. This leads to different interference effects on the damping silencer 1 and the sound waves therein at different locations. This avoids resonance that can easily occur when multiple rotating shafts 3 have the same eccentric force, while achieving a better noise reduction effect with a wider range of interference vibration frequencies, resulting in superior performance.

[0036] Furthermore, a connecting pipe 11 is integrally formed at one end of the damping silencer pipe 1 near the air inlet of the ventilator. The connecting pipe 11 is fixed and connected to the air inlet of the ventilator through a flange structure. A silencer inner pipe 13 is fixed inside the damping silencer pipe 1. Both the damping silencer pipe 1 and the silencer inner pipe 13 are provided with through holes 12 for the rotating shaft 3 to rotate through.

[0037] The air intake hopper 2 includes a main hopper body 21. The outer periphery of the main hopper body 21 is fixed to the inner side of the damping silencer pipe 1. An outer silencer layer 22 is fixedly embedded in the inner side of the main hopper body 21. An inner silencer layer 23 is fixedly embedded in the outer side of the main hopper body 21. The inner silencer layer 23 is located inside the damping silencer pipe 1.

[0038] It should be further noted that the driven impeller 5, the inner silencing tube 13, the outer silencing layer 22, and the inner silencing layer 23 are all made of silencing materials commonly used in the prior art and applicable to this embodiment, such as polyester fiber sound-absorbing cotton, melamine sound-absorbing foam, etc. The driven impeller 5 needs to be made of lightweight and rigid materials (such as melamine sound-absorbing foam). The specific materials can be selected according to the actual needs of use and design requirements.

[0039] The working principle of this utility model is as follows: During daily use, when the ventilator is intake, the airflow enters the damping silencer duct 1 from the air intake hopper 2. The outer silencer layer 22 can initially eliminate the noise during air intake. After the airflow enters the damping silencer duct 1, since the inner diameter of the damping silencer duct 1 is larger than the inner diameter of the air intake hopper 2, the air pressure in the middle of the damping silencer duct 1 is reduced, forming a slow flow, which can further reduce noise. The design of the inner silencer duct 13 and the inner silencer layer 23 can weaken the propagation of noise in the damping silencer duct 1 or to the outside, further playing a noise reduction role.

[0040] Simultaneously, the passing airflow blows the driven impeller 5. When the driven impeller 5 rotates, it drives the connecting ring 41 and the vibration damping rod 42 to rotate through the rotating shaft 3. When the vibration damping rod 42 rotates, it can generate an eccentric force deviating from the axis of the rotating shaft 3 under the centrifugal action of the vibration damping ball 421. The eccentric force is transmitted to the damping silencer 1 through the rotating shaft 3, thereby interfering with the vibration of the damping silencer 1 and disrupting the refraction of sound waves in the damping silencer 1. This reduces the probability of sound resonance in the damping silencer 1. Weakening or eliminating the vibration of the damping silencer 1 can also reduce noise generation. Thus, by directly interfering with the vibration and sound wave resonance at the damping silencer 1, the purpose of noise reduction can be achieved, effectively weakening noise and achieving a good noise reduction effect.

[0041] 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 mine ventilation fan with vibration reduction and noise reduction function, comprising a ventilation fan and a damping silencer pipe (1) fixed and connected to the air inlet of the ventilation fan, wherein the inner diameter of one end of the damping silencer pipe (1) connected to the air inlet of the ventilation fan is smaller than the inner diameter of the other end, characterized in that: The damping silencer pipe (1) has an air inlet hopper (2) fixed at one end away from the air inlet of the ventilator. The air inlet hopper (2) is fixed inside the damping silencer pipe (1). The air inlet hopper (2) is bucket-shaped. An outer sound-absorbing layer (22) is fixed inside the air inlet hopper (2). A rotating shaft (3) is rotatably connected to the damping silencer pipe (1). One end of the rotating shaft (3) extends into the damping silencer pipe (1) and is fixed with a driven impeller (5). The driven impeller (5) rotates with the airflow in the damping silencer pipe (1). The other end of the rotating shaft (3) is located outside the damping silencer pipe (1) and is fixedly installed with a vibration damping component (4). When the vibration damping component (4) rotates, it generates an eccentric force. The eccentric force of the vibration damping component (4) is transmitted to the damping silencer pipe (1) through the rotating shaft (3).

2. A mine ventilation fan with vibration reduction and noise reduction function according to claim 1, characterized in that: The vibration damping component (4) includes a connecting ring (41) and a vibration damping rod (42). The connecting ring (41) is fixedly sleeved on the rotating shaft (3). One end of the vibration damping rod (42) is fixed to the periphery of the connecting ring (41), and the other end of the vibration damping rod (42) is integrally formed with a vibration damping ball (421).

3. A mine ventilation fan with vibration reduction and noise reduction function according to claim 2, characterized in that: At least two vibration damping rods (42) are provided, and at least two vibration damping rods (42) are irregularly distributed along the periphery of the connecting ring (41), and the distribution center of at least two vibration damping rods (42) is deviated from the axis of the connecting ring (41).

4. A mine ventilation fan with vibration reduction and noise reduction function according to claim 1, characterized in that: The portion of the rotating shaft (3) located inside the damping silencer tube (1) and the driven impeller (5) are both located on one side of the damping silencer tube (1), and the axis of the rotating shaft (3) is offset from the axis of the damping silencer tube (1).

5. A mine ventilation fan with vibration reduction and noise reduction function according to claim 4, characterized in that: The rotating shaft (3), vibration damping component (4), and driven impeller (5) are provided in multiple sets. The multiple sets of the rotating shaft (3), vibration damping component (4), and driven impeller (5) are distributed circumferentially along the axis of the damping silencer pipe (1), and the multiple sets of the rotating shaft (3), vibration damping component (4), and driven impeller (5) are arranged sequentially along the extension direction of the axis of the damping silencer pipe (1).

6. A mine ventilation fan with vibration reduction and noise reduction function according to claim 5, characterized in that: The blades of the multiple driven impellers (5) are of different sizes, and the multiple driven impellers (5) are all impellers made of sound-absorbing material.

7. A mine ventilation fan with vibration damping and noise reduction function according to any one of claims 1-6, characterized in that: The damping silencer pipe (1) has a connecting pipe (11) integrally formed at one end near the air inlet of the ventilator. The connecting pipe (11) is fixed and connected to the air inlet of the ventilator through a flange structure. The inner side of the damping silencer pipe (1) is fixed with a silencer inner pipe (13). Both the damping silencer pipe (1) and the silencer inner pipe (13) are provided with through holes (12) for the rotating shaft (3) to rotate through. The air intake hopper (2) includes a main hopper body (21), the outer periphery of the main hopper body (21) is fixed to the inner side of the damping silencer pipe (1), the outer silencer layer (22) is fixedly embedded in the inner side of the main hopper body (21), and the outer side of the main hopper body (21) is fixedly embedded with an inner silencer layer (23), which is located inside the damping silencer pipe (1).

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