Full-band silencer

Abstract

A full-band silencer comprises a connecting pipe, a first flange is welded to one end of the connecting pipe, a conical expanding pipe is welded to the other end of the connecting pipe, an inner pipe is welded to the other end of the conical expanding pipe, and a plurality of holes are formed in the inner pipe. This diffusion reduces sound wave energy directly transmitted to a receiver, thereby reducing the level of perceived noise, and the acoustic impedance matching condition between the interior and exterior of the inner tube is changed by the provision of the aperture. Under the ideal condition, the efficiency of sound waves spreading outwards from the interior of the inner pipe can be reduced, part of noise can be reflected back to the interior of the inner pipe instead of being completely transmitted out, and therefore the noise reduction effect is achieved.

Description

Technical Field

[0001] This utility model relates to the field of sound insulation technology, and in particular to a full-band silencer. Background Technology

[0002] A silencer is a noise control device that can impede or reduce the outward propagation of sound while allowing airflow to pass smoothly. Silencers currently used in ventilation and air conditioning system ducts include plate-type, straight-tube type, honeycomb type, tubular type, folded plate type, acoustic flow type, elbow type, louver type, labyrinth type, disc type, and ring type silencers. However, most of these silencers target mid-to-high frequency noise, while low-frequency noise is easily generated due to reduced airflow speed. Low-frequency noise is more difficult to reduce than mid-to-high frequency noise. Furthermore, while the existing methods are effective for mid-to-high frequencies, their sound insulation effect on low frequencies is relatively poor. Utility Model Content

[0003] This invention provides a full-band silencer to overcome the shortcomings of the prior art and solve the problem of poor low-frequency sound insulation, thus having strong practicality.

[0004] In order to achieve the purpose of this utility model, the following technology is proposed to be adopted:

[0005] A full-frequency silencer includes a connecting pipe with a first flange welded to one end and a tapered expander welded to the other end. An inner pipe is welded to the other end of the tapered expander, and multiple holes are formed in the inner pipe. By creating these holes, when noise passes through the inner pipe, sound waves are dispersed into multiple directions. This dispersion reduces the sound wave energy directly transmitted to the receiver, thereby lowering the perceived noise level. Furthermore, the holes alter the acoustic impedance matching condition between the inside and outside of the inner pipe. Ideally, this helps reduce the efficiency of sound wave propagation from the inside of the inner pipe to the outside; some noise is reflected back into the inner pipe instead of being entirely transmitted, thus achieving noise reduction.

[0006] One section of the inner tube is fitted with a rectangular outer shell. A sealing ring plate is welded to one end of the rectangular outer shell, and the sealing ring plate is fitted and welded to the junction of the tapered expansion tube and the inner tube. A second flange is welded to the other end of the rectangular outer shell. The rectangular outer shell is used to block noise from propagating outward, and multiple baffles can be installed inside it to reduce noise through the Helmholtz resonance principle.

[0007] The other end of the inner tube is fitted with an end shell, and sound-absorbing cotton is filled between the inner tube and the end shell. An inner ring plate is welded to the outer end of the end shell and is welded to the outer end of the inner tube. A third flange is welded to the inner end of the end shell and is bolted to the second flange. The end shell can further improve the noise reduction effect.

[0008] The inner tube has a cross-shaped partition inside, which is located inside the rectangular outer shell. The cross-shaped partition has multiple holes, which allows for noise reduction. The cross-shaped structure design increases the amount of noise propagation inside the inner tube and improves the noise reduction effect by reducing the generation of noise inside.

[0009] The inner tube is also equipped with multiple sound-absorbing components. The two sides of the sound-absorbing components are fixed to the inner tube by connectors. The sound-absorbing components further improve the sound absorption and noise reduction effect.

[0010] Furthermore, multiple inner strips are welded to the outer periphery of the inner tube. The length direction of the inner strips is parallel to the length direction of the inner tube, and the outer side of the inner strips is welded to the rectangular outer shell. The inner strips enhance the structural strength of the inner tube.

[0011] Furthermore, multiple spacer rings are welded to the outer periphery of the inner tube along its length. The spacer rings and inner strips divide the space between the inner tube and the rectangular outer shell into multiple cavities, thereby reducing noise by means of the Helmholtz resonance principle. In addition, multiple notches are optionally provided on the spacer rings, and V-shaped plates are welded between two adjacent notches. The tips of the V-shaped plates face the air inlet end of the inner tube, thereby reducing the propagation of noise. At the same time, the energy of noise propagation is reduced by the spacer rings, etc.

[0012] Furthermore, the cross-shaped separator includes a waist-shaped vertical shell with rounded ends. Multiple perforations are located on the waist-shaped vertical shell, which contains an internal reinforcing plate and is filled with sound-absorbing cotton. Side shells are welded to both sides of the waist-shaped vertical shell, with rounded ends and multiple ventilation holes. These side shells are also filled with sound-absorbing cotton. The sound-absorbing cotton enhances the sound absorption and noise reduction capabilities of the cross-shaped separator. The waist-shaped structure also facilitates airflow.

[0013] Furthermore, the inlet dimensions of the side shell and the waist-shaped vertical shell are smaller than the outlet dimensions. This wedge-shaped structure design increases the sound absorption area and facilitates airflow.

[0014] Furthermore, the silencer is installed at an angle inside the inner tube, with a burr at the air inlet end. The silencer has a hollow internal structure and is filled with sound-absorbing cotton. The sound-absorbing cotton further reduces the noise level at the air outlet.

[0015] The advantages of the above technical solution are:

[0016] This invention utilizes microporous noise reduction and the Helmholtz resonance principle to reduce and absorb noise in different frequency ranges, thereby improving the noise reduction effect. Attached Figure Description

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be described in further detail below with reference to the accompanying drawings.

[0018] Figure 1 A three-dimensional structural diagram of one embodiment is shown.

[0019] Figure 2 A three-dimensional structural diagram of the rectangular shell is shown.

[0020] Figure 3 A three-dimensional structural diagram of the inner tube is shown.

[0021] Figure 4 A three-dimensional structural diagram of the cross-shaped separator is shown.

[0022] Figure 5 A three-dimensional structural diagram of the muffler is shown.

[0023] Figure 6 A three-dimensional structural diagram of the end shell is shown. Detailed Implementation

[0024] like Figures 1-6 As shown, a full-band silencer includes a connecting pipe 1, a first flange 10 welded to one end of the connecting pipe 1, a tapered expansion pipe 11 welded to the other end of the connecting pipe 1, an inner pipe 12 welded to the other end of the tapered expansion pipe 11, and multiple holes 14 opened on the inner pipe 12.

[0025] A rectangular outer shell 2 is fitted onto one section of the inner tube 12. A sealing ring plate 21 is welded to one end of the rectangular outer shell 2. The sealing ring plate 21 is fitted onto and welded to the junction of the tapered expander 11 and the inner tube 12. A second flange 20 is welded to the other end of the rectangular outer shell 2. Multiple spacer rings 15 are welded along the length of the outer periphery of the inner tube 12. Multiple notches 16 are opened on the spacer rings 15. A V-shaped plate 17 is welded between two adjacent notches 16, with the tip of the V-shaped plate 17 facing the air inlet end of the inner tube 12.

[0026] Multiple inner strips 13 are welded to the outer periphery of the inner tube 12. The length direction of the inner strips 13 is parallel to the length direction of the inner tube 12, and the outer side of the inner strips 13 is welded to the rectangular outer shell 2.

[0027] The other end of the inner tube 12 is fitted with an end shell 23. The space between the inner tube 12 and the end shell 23 is filled with sound-absorbing cotton. An inner ring plate 24 is welded to the outer end of the end shell 23. The inner ring plate 24 is welded to the outer end of the inner tube 12. A third flange 22 is welded to the inner end of the end shell 23. The third flange 22 is bolted to the second flange 20.

[0028] The inner tube 12 has a cross-shaped divider inside, which is located inside the rectangular outer shell 2.

[0029] The cross-shaped separator includes a waist-shaped vertical shell 3, with rounded ends at both ends. Multiple perforations are provided on the waist-shaped vertical shell 3. An internal reinforcing plate 30 is installed inside the waist-shaped vertical shell 3, which is filled with sound-absorbing cotton. Side shells 32 are welded to both sides of the waist-shaped vertical shell 3. The front and rear ends of the side shells 32 are also rounded, and multiple vents are provided on the side shells 32. These side shells are also filled with sound-absorbing cotton. Optionally, the air inlet dimensions of the side shells 32 and the waist-shaped vertical shell 3 are smaller than their air outlet dimensions. The perforations and vents have a diameter of 3mm, a spacing of 3mm, and a perforation rate of 20%~23%.

[0030] The inner tube 12 is also equipped with multiple silencers 4. The two sides of the silencers 4 are fixed to the inner tube 12 by connectors 41. The silencers 4 are inclined inside the inner tube 12. The air inlet end of the silencers 4 is provided with a burr 40. The silencers 4 has a hollow structure inside and is filled with sound-absorbing cotton. The silencers 4 has multiple holes with a diameter of 0.8mm to 1.0mm and a perforation rate of 1% to 5%.

[0031] The aforementioned components are coated with a 0.5mm thick damping coating to reduce the penetration of low- and mid-frequency noise.

[0032] The first flange 10 on the full-band silencer is bolted to the air outlet duct.

[0033] When this full-band silencer is discharging air, the fast or slow-moving air flows sequentially through the conical expander 11, the inner tube 12, the cross-shaped separator, and the silencer 4 before being discharged. The noise generated during this airflow is absorbed or its propagation energy is reduced by the sound-absorbing cotton. The sound-absorbing cotton used is centrifugal glass wool. The holes in each component not only reduce noise internally but also externally, employing a complementary noise reduction method. Internal noise reduction reduces the energy of outward-propagating noise, while the holes in each component disperse noise in multiple directions, thus weakening its propagation energy. Furthermore, the provision of multiple relatively sealed chambers allows noise to enter, causing air vibration within these chambers, thereby absorbing noise and improving the noise reduction effect.

[0034] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations of this utility model fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A full-frequency band silencer, characterized in that, It includes a connecting pipe (1), one end of which is welded with a first flange (10), and the other end of which is welded with a tapered expansion pipe (11). The other end of the tapered expansion pipe (11) is welded with an inner pipe (12), and the inner pipe (12) has multiple holes (14). A rectangular outer shell (2) is fitted onto one section of the inner tube (12). A sealing ring plate (21) is welded to one end of the rectangular outer shell (2). The sealing ring plate (21) is fitted onto and welded to the junction of the tapered expansion tube (11) and the inner tube (12). A second flange (20) is welded to the other end of the rectangular outer shell (2). The other end of the inner tube (12) is fitted with an end shell (23). The space between the inner tube (12) and the end shell (23) is filled with sound-absorbing cotton. An inner ring plate (24) is welded to the outer end of the end shell (23). The inner ring plate (24) is welded to the outer end of the inner tube (12). A third flange (22) is welded to the inner end of the end shell (23). The third flange (22) is bolted to the second flange (20). The inner tube (12) is provided with a cross-shaped partition inside, which is located inside the rectangular outer shell (2); The inner tube (12) is also equipped with multiple sound-absorbing components (4), and the two sides of the sound-absorbing components (4) are fixed inside the inner tube (12) by connectors (41).

2. The full-band silencer according to claim 1, characterized in that, Multiple inner strips (13) are welded to the outer periphery of the inner tube (12). The length direction of the inner strips (13) is parallel to the length direction of the inner tube (12), and the outer side of the inner strips (13) is welded to the rectangular outer shell (2).

3. The full-band silencer according to claim 1, characterized in that, The outer periphery of the inner tube (12) is welded with multiple spacer rings (15) along its length, and multiple notches (16) are provided on the spacer rings (15).

4. The full-band silencer according to claim 3, characterized in that, A V-shaped piece (17) is welded between two adjacent notches (16), with the tip of the V-shaped piece (17) facing the air inlet of the inner tube (12).

5. The full-band silencer according to claim 1, characterized in that, The cross-shaped separator includes a waist-shaped vertical shell (3), the front and rear ends of the waist-shaped vertical shell (3) are arc-shaped structures, multiple perforations are provided on the waist-shaped vertical shell (3), an internal reinforcing plate (30) is provided inside the waist-shaped vertical shell (3), and sound-absorbing cotton is filled inside the waist-shaped vertical shell (3). The waist-shaped vertical shell (3) has side shells (32) welded on both sides. The front and rear ends of the side shells (32) are arc-shaped. Multiple ventilation holes are opened on the side shells (32). The side shells (32) are filled with sound-absorbing cotton.

6. The full-band silencer according to claim 5, characterized in that, The air inlet dimensions of the side shell (32) and the waist-shaped vertical shell (3) are smaller than the air outlet dimensions.

7. The full-band silencer according to claim 1, characterized in that, The silencer (4) is inclined and installed inside the inner tube (12). The air inlet end of the silencer (4) is provided with a burr (40). The interior of the silencer (4) is hollow and filled with sound-absorbing cotton.

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