A noise reduction device for HVAC ducts

Abstract

This invention discloses a noise reduction device for HVAC ducts, relating to the field of HVAC technology. The invention includes a duct with flanges connected to both ends, and a noise reduction mechanism comprising a sintered metal fiber tube disposed on the inner wall of the duct. The inner wall of the sintered metal fiber tube has an array of honeycomb holes. A sound-absorbing cotton layer is disposed on the inner wall of the sintered metal fiber tube, and an aluminum alloy cylinder is disposed on the inner wall of the sound-absorbing cotton layer. The inner wall of the aluminum alloy cylinder has an array of micropores. This invention, by placing a sintered metal fiber tube, a sound-absorbing cotton layer, and an aluminum alloy cylinder inside the duct, combined with the honeycomb holes and micropores, forms a multi-layered sound-absorbing and noise-reducing structure, which can effectively absorb and reduce the noise of airflow, thereby improving the noise reduction effect of the duct.

Description

Technical Field

[0001] This invention relates to the field of heating, ventilation and air conditioning technology, and specifically to a noise reduction device for air ducts in heating, ventilation and air conditioning systems. Background Technology

[0002] When HVAC systems are running, airflow moves within the ducts, generating noise. The faster the airflow, the louder the noise. To avoid noise pollution, noise reduction devices are used to reduce noise.

[0003] Existing noise reduction devices typically involve placing sound-absorbing cotton on the inner wall of the duct. Relying solely on the sound absorption properties of the cotton results in poor noise reduction performance. Furthermore, when the airflow velocity is high, the impact force of the airflow on the sound-absorbing cotton is significant. This not only easily causes the cotton fibers to be stripped by the airflow, leading to contamination, but also causes the cotton to be compacted, weakening or even rendering its sound absorption performance ineffective. Therefore, this invention proposes a noise reduction device for HVAC ducts. Utility Model Content

[0004] The purpose of this invention is to provide a noise reduction device for HVAC ducts in order to solve the problems mentioned above in the background art.

[0005] To achieve the above objectives, the present invention specifically adopts the following technical solution:

[0006] A noise reduction device for HVAC ducts includes a duct with flanges connected to both ends, and further includes:

[0007] The noise reduction mechanism includes a sintered metal fiber tube disposed on the inner wall of a conduit. The inner wall of the sintered metal fiber tube is arrayed with several honeycomb holes. The inner wall of the sintered metal fiber tube is provided with a sound-absorbing cotton layer. The inner wall of the sound-absorbing cotton layer is provided with an aluminum alloy tube. The inner wall of the aluminum alloy tube is arrayed with several micropores.

[0008] Furthermore, a number of ring-shaped spacers are provided between the aluminum alloy cylinder and the sintered metal fiber cylinder, and all of the spacers are embedded in the sound-absorbing cotton layer.

[0009] Furthermore, the spacer bar is constructed as a spiral bar with one end extending into the inner side of the aluminum alloy cylinder.

[0010] Furthermore, the outer surface of one end of the spacer located inside the aluminum alloy cylinder has an array of microgrooves.

[0011] Furthermore, each of the aforementioned honeycomb holes is filled with damping particles.

[0012] Furthermore, the inner wall of the sintered metal fiber tube is provided with a stainless steel mesh covering the honeycomb holes.

[0013] Furthermore, both ends of the aluminum alloy cylinder are connected to the inner wall of the conduit with tapered cylinders.

[0014] Furthermore, the outer wall of the duct is arrayed with several heat dissipation fins.

[0015] The beneficial effects of this invention are as follows:

[0016] 1. In this invention, by setting sintered metal fiber tubes, sound-absorbing cotton layers and aluminum alloy tubes inside the duct, and combining them with honeycomb holes and micropores, a multi-layer sound-absorbing and noise-reducing structure is formed, which can effectively absorb and reduce the noise of airflow, thereby improving the noise reduction effect of the duct.

[0017] 2. In this invention, damping particles are filled in the honeycomb cells. The damping particles are composite particles with different particle sizes. When the sound wave is transmitted to the sintered metal fiber tube, the damping particles are excited to vibrate under the action of the sound wave, causing the damping particles to collide and rub against each other. The damping particles rub against the inner wall of the honeycomb cells, converting kinetic energy into heat energy, thereby improving the noise reduction performance. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0019] Figure 2 This is a three-dimensional structural cross-sectional view of the present invention;

[0020] Figure 3 This is another three-dimensional structural sectional view of the present invention;

[0021] Figure 4 This is a partial three-dimensional structural diagram of the present invention;

[0022] Figure 5 This is another three-dimensional structural diagram of the present invention;

[0023] Figure 6 This is the present invention. Figure 2 Enlarged view of point A in the middle;

[0024] Figure 7 This is the present invention. Figure 3 Enlarged view of section B in the middle.

[0025] Reference numerals: 1. Conduit; 2. Flange; 3. Noise reduction mechanism; 4. Spacer bar; 5. Damping particles; 6. Stainless steel mesh; 7. Conical cylinder; 8. Heat dissipation fins; 301. Sintered metal fiber cylinder; 302. Honeycomb holes; 303. Sound-absorbing cotton layer; 304. Aluminum alloy cylinder; 305. Micropores. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0027] like Figures 1-7 As shown, an embodiment of the present invention provides a duct noise reduction device for HVAC systems, including a duct 1 with flanges 2 connected to both ends. Preferably, the duct 1 can be connected to the air duct and the indoor air inlet through the flanges 2, or the duct 1 itself can be used as an air duct. This is a distinguishing feature of the prior art of the present invention.

[0028] The distinguishing technical features of this invention also include: a noise reduction mechanism 3, comprising a sintered metal fiber tube 301 disposed on the inner wall of the conduit 1. The inner wall of the sintered metal fiber tube 301 is arrayed with a plurality of honeycomb holes 302. The sintered metal fiber tube 301 is made of 316L stainless steel fiber sintered at high temperature, enabling broadband sound absorption. By arraying a plurality of honeycomb holes 302 on its inner wall, the honeycomb holes 302 form sound wave scattering points, enhancing mid-to-high frequency viscous friction energy dissipation. Simultaneously, the arrangement of the honeycomb holes 302 also provides a certain sound absorption function (Helmholtz resonant cavity effect), thus achieving sound absorption and noise reduction. The inner wall of the sintered metal fiber cylinder 301 is provided with a sound-absorbing cotton layer 303. Preferably, the sound-absorbing cotton layer 303 is made of ceramic fiber cotton, which can not only effectively absorb noise, but also prevent fiber shedding and pollution. The inner wall of the sound-absorbing cotton layer 303 is provided with an aluminum alloy cylinder 304. The inner wall of the aluminum alloy cylinder 304 is arrayed with several micro-holes 305. By setting the aluminum alloy cylinder 304, the airflow is prevented from directly impacting the sound-absorbing cotton layer 303 and the sound-absorbing cotton fibers are prevented from being stripped by the airflow. The micro-holes 305 allow medium and high frequency sound waves to penetrate and be absorbed by the sound-absorbing cotton layer 303, thus playing a role in sound transmission and protection.

[0029] In this solution, by setting a sintered metal fiber tube 301, a sound-absorbing cotton layer 303, and an aluminum alloy tube 304 inside the duct 1, and combining them with honeycomb holes 302 and micropores 305, a multi-layer sound-absorbing and noise-reducing structure is formed, which can effectively absorb and reduce the noise of the airflow, thereby improving the noise reduction effect of the duct.

[0030] like Figure 4 As shown, the present invention discloses a further technical solution for the sound-absorbing cotton layer 303. A plurality of spacers 4 arranged in a ring are provided between the aluminum alloy cylinder 304 and the sintered metal fiber cylinder 301. The spacers 4 are embedded in the sound-absorbing cotton layer 303. By providing the spacers 4, they are used to support and reinforce the aluminum alloy cylinder 304 and the sintered metal fiber cylinder 301, to fix the thickness of the sound-absorbing cotton layer 303, to prevent it from being compacted and failing, and to ensure the sound-absorbing cotton layer 303's noise reduction performance.

[0031] like Figure 2 , Figure 3 and Figure 4 As shown, the present invention discloses a further technical solution for the spacer bar 4. The spacer bar 4 is constructed as a spiral bar with one end extending to the inner side of the aluminum alloy cylinder 304. By constructing the spacer bar 4 as a spiral bar and extending to the inner side of the aluminum alloy cylinder 304, its spiral structure can be used as a guide plate to guide the airflow in a spiral manner. During the rotation process, the airflow converts a large amount of kinetic energy into heat energy and consumes it through intense turbulent friction, centripetal acceleration and viscosity. This not only further improves the noise reduction effect, but also guides the airflow to the inner wall of the aluminum alloy cylinder 304, and performs sound absorption and noise reduction through the sound-absorbing cotton layer 303 and the sintered metal fiber cylinder 301.

[0032] like Figure 2 As shown, the present invention discloses a further technical solution for the spacer bar 4. The spacer bar 4 has microgrooves arrayed on the outer surface of one end inside the aluminum alloy cylinder 304. Preferably, the microgrooves are not shown in the figure. The microgrooves can be conical grooves or honeycomb grooves, and the inner diameter of the end near the groove opening gradually decreases. These microgrooves can form a Helmholtz cavity structure, which can effectively absorb the mid-to-high frequency noise generated by the airflow, thereby further improving the noise reduction effect.

[0033] like Figure 6 and Figure 7 As shown, the present invention discloses a further technical solution for the honeycomb holes 302. Each of the honeycomb holes 302 is filled with damping particles 5. Preferably, the damping particles 5 are composite particles, such as 316L stainless steel particles, tungsten powder particles, and silicone rubber particles, and different particle sizes are used. By filling the honeycomb holes 302 with damping particles 5, when sound waves are transmitted to the sintered metal fiber cylinder 301, the damping particles 5 are excited to vibrate under the action of the sound waves, causing the damping particles 5 to collide and rub against each other. The damping particles 5 rub against the inner wall of the honeycomb holes 302, converting kinetic energy into heat energy, thereby improving the noise reduction performance. By using particles of different materials and different particle sizes, noise in different frequency bands can be absorbed and reduced, thereby improving practicality.

[0034] like Figure 5 , Figure 6 and Figure 7 As shown, the present invention discloses a further technical solution for the sintered metal fiber cylinder 301. The inner wall of the sintered metal fiber cylinder 301 is provided with a stainless steel mesh 6 covering the honeycomb holes 302. By providing the stainless steel mesh 6 on the inner wall of the sintered metal fiber cylinder 301, it is used to prevent the damping particles 5 from escaping and avoid them from entering the sound-absorbing cotton layer 303 and affecting its sound absorption and noise reduction performance.

[0035] like Figure 2 and Figure 6As shown, the present invention discloses a further technical solution for the aluminum alloy cylinder 304. Both ends of the aluminum alloy cylinder 304 are connected to the inner wall of the conduit 1 with conical cylinders 7. By connecting the conical cylinders 7 to both ends of the aluminum alloy cylinder 304, the airflow can be smoothly transitioned and flowed, avoiding airflow separation and further improving the noise reduction performance.

[0036] like Figure 1 and Figure 3 As shown, the present invention discloses a further technical solution for the conduit 1. The outer wall of the conduit 1 is arrayed with a number of heat dissipation fins 8. Since the kinetic energy is converted into heat energy by the damping particles 5 for noise reduction, the heat dissipation fins 8 are provided to improve the heat dissipation efficiency of the conduit 1, thereby improving its practicality.

[0037] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A duct noise reduction device for heating, ventilation and air conditioning, comprising a duct (1), both ends of which are connected with flanges (2), characterized in that, Also includes: The noise reduction mechanism (3) includes a sintered metal fiber tube (301) disposed on the inner wall of the conduit (1). The inner wall of the sintered metal fiber tube (301) is provided with a plurality of honeycomb holes (302). The inner wall of the sintered metal fiber tube (301) is provided with a sound-absorbing cotton layer (303). The inner wall of the sound-absorbing cotton layer (303) is provided with an aluminum alloy tube (304). The inner wall of the aluminum alloy tube (304) is provided with a plurality of micropores (305) through it.

2. The noise reduction device for HVAC ducts according to claim 1, characterized in that, A number of spacers (4) arranged in a ring are provided between the aluminum alloy cylinder (304) and the sintered metal fiber cylinder (301), and the spacers (4) are embedded in the sound-absorbing cotton layer (303).

3. The noise reduction device for HVAC ducts according to claim 2, characterized in that, The spacer bar (4) is constructed as a spiral bar with one end extending to the inside of the aluminum alloy cylinder (304).

4. The noise reduction device for HVAC ducts according to claim 3, characterized in that, The spacer (4) has microgrooves arrayed on the outer surface of one end inside the aluminum alloy cylinder (304).

5. The noise reduction device for HVAC ducts according to claim 1, characterized in that, Each of the honeycomb holes (302) is filled with damping particles (5).

6. The noise reduction device for HVAC ducts according to claim 1, characterized in that, The inner wall of the sintered metal fiber tube (301) is provided with a stainless steel mesh (6) covering the honeycomb holes (302).

7. The noise reduction device for HVAC ducts according to claim 1, characterized in that, Both ends of the aluminum alloy cylinder (304) are connected to the inner wall of the conduit (1) with tapered cylinders (7).

8. The noise reduction device for HVAC ducts according to claim 1, characterized in that, The outer wall of the conduit (1) is provided with a number of heat dissipation fins (8).

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