A noise reduction device for a ventilator

Abstract

The utility model provides a sound attenuation and noise reduction device for ventilator relates to sound attenuation and noise reduction technical field, including flange pipe seat, the flange pipe seat main part is H shape structure, and the front side middle welding of flange pipe seat is provided with the grid inner frame, and the grid inner frame is by the twenty four groups of straight pole and forty groups of connecting ring of around setting constitutes, and the connecting ring inner wall is sharp edge, and the straight pole side close to connecting ring center is also sharp edge, the front end of grid inner frame integrative is provided with the baffle, the front side of flange pipe seat is around fixed and is provided with twenty four groups of fixed strip, and the side close to grid inner frame of fixed strip all is fixedly provided with rubber strip, and the side close to grid inner frame of rubber strip all is fixedly provided with the vibration absorbing piece of equidistance, and the vibration absorbing piece is aligned with the grid hole of grid inner frame, the sound wave is directly offset, and the noise reduction efficiency is promoted: the sharp edge structure of grid inner frame cooperates the vibration absorbing piece of " black spade " shape spring steel material quality, and the sound wave is directly absorbed in accurate alignment grid hole, and the vibration absorbing piece vibration is buffered and dissipates through rubber strip, avoids the continuous propagation of sound wave.

Description

Technical Field

[0001] This utility model belongs to the field of noise reduction technology, and more specifically, it relates to a noise reduction device for a ventilation fan. Background Technology

[0002] Ventilation fans used in mining generate noise during operation, which originates from aerodynamics, mechanical structure, and electromagnetic effects. Excessive noise can harm health and the environment. External noise reduction devices are generally used to suppress noise in different frequency bands through resistive sound absorption, reactive resonant expansion chambers, or impedance composite structures, adapting to different working conditions.

[0003] Based on the above, the noise reduction devices currently in use reduce noise by extending the propagation channel, which is inconvenient to directly cancel out sound waves and not conducive to dissipating sound waves, resulting in weak noise reduction effect. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides a noise reduction device for a ventilation fan, which solves the problem mentioned in the background art that existing noise reduction devices reduce noise by extending the propagation channel, making it inconvenient to directly cancel out sound waves, not conducive to dispersing sound waves, and resulting in weak noise reduction effect.

[0005] The purpose and effect of this utility model's noise reduction and silencing device for ventilation fans are achieved through the following specific technical means:

[0006] A noise reduction device for a ventilator includes a flange base. The flange base has an H-shaped structure. A grid inner frame is welded to the middle of the front side of the flange base. The grid inner frame consists of twenty-four sets of straight rods and forty sets of connecting rings arranged in a ring. The inner wall of the connecting rings is pointed, and the side of the straight rods near the center of the connecting rings is also pointed. A baffle is integrally provided at the front end of the grid inner frame. Twenty-four sets of fixing strips are fixedly arranged in a ring around the front side of the flange base. Rubber strips are fixedly installed on the side of the fixing strips near the grid inner frame. Vibration-absorbing elements are fixedly installed at equal intervals on the side of the rubber strips near the grid inner frame. The vibration-absorbing elements are aligned with the grid holes of the grid inner frame.

[0007] Furthermore, the plane of the vibration-absorbing component is a spade-shaped structure, the number of vibration-absorbing components is the same as the number of grid holes in the inner frame of the grid, and the vibration-absorbing components are aligned with the grid holes in the inner frame of the grid; the vibration-absorbing components are made of spring steel.

[0008] Furthermore, the front side of the flange pipe seat is provided with twenty-four sets of trapezoidal groove-shaped frames, with the upper bottom of the trapezoidal groove-shaped frames close to the flange pipe seat.

[0009] Furthermore, the trapezoidal frame and the fixing strip are arranged in an alternating manner; the front exterior of the flange pipe seat has a shoulder structure and is fixedly provided with an air outlet cylinder, which wraps around the trapezoidal frame.

[0010] Furthermore, an exhaust hole is provided around the outer circumference of the exhaust cylinder, and the exhaust hole has a bend structure; a cover is fixedly provided at the front end of the exhaust cylinder.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] Sound waves are directly canceled out, improving noise reduction efficiency: The sharp edge structure of the inner grid frame, combined with the spade-shaped vibration absorber made of spring steel, precisely aligns with the grid holes to directly absorb sound waves. The vibration of the vibration absorber is buffered and dissipated by the rubber strip, preventing the sound waves from propagating continuously.

[0013] Airflow diversion and pressurization work together to reduce residual noise: The staggered arrangement of the trapezoidal frame and the fixed strips not only diverts the airflow to reduce turbulent noise, but also increases the flow velocity by compressing the air, and further reduces the intensity of residual sound waves by means of the pressurization effect.

[0014] Multiple structural interception for comprehensive noise reduction: The turn-type exhaust port of the outer cylinder and the front cover form a secondary interception, which extends the sound wave propagation path and attenuates the unabsorbed sound waves again, ensuring that the noise of the exhaust air is reduced to the minimum. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0016] Figure 2 This is a three-dimensional disassembly diagram of the present invention.

[0017] Figure 3 This is a three-dimensional structural diagram of the grid inner frame of this utility model.

[0018] Figure 4 This is a three-dimensional structural diagram of the air outlet outer cylinder of this utility model.

[0019] Figure 5 This is a utility model Figure 2 A magnified schematic diagram of the structure at point A.

[0020] In the diagram, the correspondence between component names and drawing numbers is as follows:

[0021] 1. Flange pipe seat; 2. Inner grid frame; 3. Fixing strip; 4. Rubber strip; 5. Vibration damping component; 6. Trapezoidal frame; 7. Outer exhaust cylinder; 701. Exhaust port; 8. Cover. Detailed Implementation

[0022] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples.

[0023] Example 1:

[0024] As attached Figure 1 To be continued Figure 5As shown:

[0025] This utility model provides a noise reduction device for a ventilation fan, including a flange seat 1. The main body of the flange seat 1 is H-shaped. A grid inner frame 2 is welded to the middle of the front side of the flange seat 1. The grid inner frame 2 is composed of twenty-four sets of straight rods and forty sets of connecting rings arranged in a circle. The inner wall of the connecting rings is pointed, and the side of the straight rods near the center of the connecting rings is also pointed. A baffle is integrally provided at the front end of the grid inner frame 2. Twenty-four sets of fixing strips 3 are fixedly arranged in a circle around the front side of the flange seat 1. Rubber strips 4 are fixedly arranged on the side of the fixing strips 3 near the grid inner frame 2. Vibration-absorbing elements 5 are fixedly arranged at equal intervals on the side of the rubber strips 4 near the grid inner frame 2. The vibration-absorbing elements 5 are aligned with the grid holes of the grid inner frame 2.

[0026] Among them, the plane of the vibration absorber 5 is a spade-shaped structure, the number of vibration absorbers 5 is the same as the number of grid holes in the inner frame 2, and the vibration absorbers 5 are aligned with the grid holes in the inner frame 2; the vibration absorbers 5 are made of spring steel.

[0027] Among them, twenty-four sets of trapezoidal brackets 6 are arranged around the front side of the flange pipe seat 1, and the upper bottom of the trapezoidal brackets 6 is close to the flange pipe seat 1.

[0028] The trapezoidal frame 6 and the fixing strip 3 are arranged in an alternating manner; the front exterior of the flange pipe seat 1 has a shoulder structure and is fixedly equipped with an air outlet cylinder 7, which wraps around the trapezoidal frame 6.

[0029] The outer cylinder 7 has an exhaust hole 701 around its outer perimeter, and the exhaust hole 701 has a bend structure; a cover 8 is fixedly installed at the front end of the outer cylinder 7.

[0030] The device is fixed to the outlet of the ventilator using flange pipe seat 1. Considering the characteristics of sound diffusion with airflow, shielding the outlet is a more efficient way to reduce noise.

[0031] When airflow and sound propagate outward, they first pass through the inner frame 2 of the grid, where the vibration absorber 5 diverts and guides the airflow, while directly absorbing sound waves and generating vibrations. These vibrations are then transmitted to the rubber strip 4 and buffered and dissipated.

[0032] The airflow continues to move forward, passing through the gaps in the trapezoidal frame 6. The trapezoidal frame 6 increases the airflow velocity by compressing the air, and weakens the residual sound waves by means of the pressurization effect.

[0033] Finally, the airflow is discharged from the exhaust port 701. The bend design of the exhaust port 701 further attenuates the residual sound waves, minimizing the noise of the discharged air.

[0034] Example 2:

[0035] If the power of the ventilator is large enough, noise reduction structures can be added, such as filling the gap between the fixing strip 3 and the trapezoidal frame 6 with sponge material, so as to significantly reduce noise while ensuring that air can pass through.

[0036] The specific usage and function of this embodiment are as follows:

[0037] In this utility model, the device is installed at the outlet of the ventilator through the flange pipe seat 1. Since the sound moves and spreads with the airflow, the method of blocking the air outlet is more efficient.

[0038] Airflow and sound propagate outward through the inner frame 2 of the grid. The vibration absorber 5 separates and guides the airflow. The vibration absorber 5 directly absorbs the sound waves and vibrates. When the vibration is transmitted to the rubber strip 4, it is buffered and dissipated. The airflow continues to move outward, passing through the gaps of the trapezoidal frame 6. The trapezoidal frame 6 can compress the outward-moving air, increase the flow rate, and reduce the residual sound waves by pressurizing. Then the airflow moves outward through the exhaust port 701. The turning structure of the exhaust port 701 weakens the residual sound waves again, so that the exhaust air reduces noise to the greatest extent.

Claims

1. A noise reduction device for a ventilation fan, characterized in that, include: Flange pipe seat (1), the main body of the flange pipe seat (1) is an H-shaped structure, and a grid inner frame (2) is welded in the middle of the front side of the flange pipe seat (1). The grid inner frame (2) is composed of twenty-four sets of straight rods and forty sets of connecting rings arranged around it. The inner wall of the connecting ring is a pointed edge, and the side of the straight rod near the center of the connecting ring is also a pointed edge. A baffle is integrally provided at the front end of the grid inner frame (2). Twenty-four sets of fixing strips (3) are fixedly arranged around the front side of the flange pipe seat (1). Rubber strips (4) are fixedly arranged on the side of the fixing strips (3) near the grid inner frame (2). Vibration absorbing elements (5) are fixedly arranged at equal intervals on the side of the rubber strips (4) near the grid inner frame (2). The vibration absorbing elements (5) are aligned with the grid holes of the grid inner frame (2).

2. The noise reduction device for a ventilator as described in claim 1, characterized in that: The vibration absorber (5) has a "spade" shaped structure in its plane. The number of vibration absorbers (5) is the same as the number of grid holes in the inner frame (2), and the vibration absorbers (5) are aligned with the grid holes in the inner frame (2). The vibration absorbers (5) are made of spring steel.

3. The noise reduction device for a ventilator as described in claim 1, characterized in that: The flange pipe seat (1) is provided with twenty-four sets of trapezoidal brackets (6) rotatably arranged around its front side, with the upper bottom of the trapezoidal brackets (6) close to the flange pipe seat (1).

4. The noise reduction device for a ventilator as described in claim 3, characterized in that: The trapezoidal frame (6) and the fixing strip (3) are arranged in an alternating manner; the front side of the flange pipe seat (1) has a shoulder structure and is fixedly provided with an air outlet cylinder (7), which wraps around the trapezoidal frame (6).

5. The noise reduction device for a ventilator as described in claim 4, characterized in that: The outer cylinder (7) is provided with an exhaust hole (701) around its outer perimeter. The exhaust hole (701) has a bend structure. A cover (8) is fixedly provided at the front end of the outer cylinder (7).

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