Air pipe silencer

Abstract

The utility model discloses an air pipe silencer, which belongs to the field of silencers and comprises air pipe bodies, a silencing mechanism is arranged between the air pipe bodies and comprises a mechanism shell, non-woven fabric and glass fiber silencing cotton, and the non-woven fabric is fixedly connected inside the mechanism shell. A rotary knob is rotated to drive a first bevel gear to rotate through a first rotating rod, the first bevel gear is meshed with a second bevel gear, so that the second bevel gear can drive a screw rod to rotate through a second rotating rod, when the screw rod rotates, an L-shaped plate matched with a screw hole can move under the guiding effect of a guide strip, and an inserting rod on a movable plate is inserted into a square pipe; compared with a traditional bolt and nut installation mode, tedious hole aligning and tightening operation is not needed, the installation efficiency is greatly improved, the construction cost is reduced, and the silencing mechanism and the air pipe body can be easily separated by reversely rotating the rotary knob to enable the insertion rod to be pulled out of the square pipe during disassembly and maintenance.

Description

Technical Field

[0001] This utility model relates to the field of silencers, and in particular to a duct silencer. Background Technology

[0002] A duct silencer is a device specifically designed to reduce airflow noise in duct systems. It is typically installed in the ducts of ventilation, air conditioning, or industrial exhaust systems. By absorbing, reflecting, or interfering with sound waves, it effectively reduces noise generated by airflow friction, eddies, or equipment vibration, thereby improving the acoustic quality of the indoor or surrounding environment. Its working principle is similar to an acoustic filter, capable of optimizing noise within a specific frequency range, ensuring efficient airflow while significantly reducing noise pollution. It is widely used in commercial buildings, hospitals, schools, and other locations with high noise control requirements.

[0003] In existing technologies, duct silencers present numerous problems in practical applications. Firstly, most existing duct silencers are installed and fixed between ducts using bolts and nuts. This installation method is cumbersome, requiring significant time and effort for tasks such as drilling and tightening bolts. This not only reduces installation efficiency but also increases construction costs. Furthermore, disassembling and maintaining the silencer also requires considerable time, further hindering maintenance and making the installation, disassembly, and use of the duct silencer inconvenient.

[0004] Meanwhile, existing duct silencers also have shortcomings in noise reduction performance. Their noise reduction effect is poor, and during long-term use, dust and other impurities in the gas can easily enter the noise reduction medium, causing blockage and severely affecting the noise reduction effect of the silencer, preventing it from performing its noise reduction function properly. Utility Model Content

[0005] The main purpose of this utility model is to provide a duct silencer that can effectively solve the problems in the background art.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A duct silencer includes a duct body with a silencer mechanism between the duct bodies. The silencer mechanism includes a housing, non-woven fabric, and fiberglass sound-absorbing cotton. The non-woven fabric is fixedly connected inside the housing, and the fiberglass sound-absorbing cotton is filled inside the housing. The silencer mechanism is fixedly connected between the duct bodies via an installation mechanism, which includes a concave plate, a first bevel gear, a screw, a second bevel gear, an L-shaped plate, a movable plate, and insert rods. The upper and lower surfaces of the housing are respectively fixedly connected to concave plates. The first bevel gear is movably connected to the concave plate via a first rotating rod on the top surface. The screw is movably connected to the side wall of the concave plate via a second rotating rod at one end. The second bevel gear is fixedly connected to the other end of the second rotating rod and meshes with the first bevel gear. The L-shaped plate is movably connected to the screw via a screw hole on the side wall of the vertical portion. The movable plate is fixedly connected to the bottom surface of the horizontal portion of the L-shaped plate. A set of symmetrical insert rods is fixedly connected to the inner side wall of the movable plate.

[0008] A further improvement of this utility model is that a set of symmetrical square tubes are fixedly installed on the top and bottom surfaces of one end of the duct body.

[0009] A further improvement of the present invention is that a sound-absorbing cavity is provided inside the housing of the mechanism, and a number of sound-absorbing holes communicating with the sound-absorbing cavity are provided on the four sides of the inner wall of the housing of the mechanism. Non-woven fabric is fixedly installed on the inner wall of the sound-absorbing cavity, and glass fiber sound-absorbing cotton is also filled inside the sound-absorbing cavity.

[0010] A further improvement of this utility model is that concave plates are fixedly installed on the top and bottom surfaces of the housing, and a first rotating hole is opened on the top surface of the concave plate. Second rotating holes are opened on the left and right side walls of the concave plate, and guide bars are fixedly installed on the left and right side walls of the concave plate.

[0011] A further improvement of this utility model is that a first rotating rod is fixedly installed on the bottom surface of the knob and movably installed in the first rotating hole, and a first bevel gear is fixedly installed at the bottom end of the first rotating rod. A second rotating rod is fixedly installed at the opposite ends of the two screws, and the second rotating rod is movably installed in the second rotating hole. A second bevel gear is fixedly installed at the inner end of the second rotating rod, and the second bevel gear meshes with the first bevel gear.

[0012] A further improvement of this utility model is that a screw hole is provided on the side wall of the vertical part of the L-shaped plate and is threadedly connected to the screw rod through the screw hole. A guide opening corresponding to the guide bar is provided on the bottom surface of the vertical part of the L-shaped plate. A movable plate is fixedly installed on the bottom surface of the horizontal part of the L-shaped plate, and a set of symmetrical insert rods are fixedly installed on the inner side wall of the movable plate and inserted into the square tube.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] In this utility model, the installation mechanism allows for the following installation steps: During installation, rotating the knob drives the first bevel gear to rotate via the first rotating rod. The first bevel gear meshes with the second bevel gear, allowing the second bevel gear to drive the screw to rotate via the second rotating rod. When the screw rotates, the L-shaped plate that mates with the screw hole moves under the guidance of the guide bar. The insert rod on the movable plate is inserted into the square tube, achieving a quick connection between the silencing mechanism and the duct body. Compared to the traditional bolt and nut installation method, this eliminates the need for tedious hole alignment and tightening operations, significantly improving installation efficiency and reducing construction costs. During disassembly and maintenance, rotating the knob in the opposite direction allows the insert rod to be pulled out of the square tube, easily separating the silencing mechanism from the duct body. This greatly enhances the convenience of maintenance work, thus facilitating the disassembly and assembly of the duct silencer.

[0015] The sound-absorbing mechanism is designed so that when airflow enters the sound-absorbing mechanism through the duct, sound waves enter the sound-absorbing chamber through the sound-absorbing holes. In the porous structure of the glass fiber sound-absorbing cotton, sound waves are continuously reflected, refracted, and rubbed, effectively consuming sound wave energy and achieving efficient sound absorption. At the same time, the non-woven fabric acts as a filter, preventing dust and other impurities in the gas from entering the interior of the glass fiber sound-absorbing cotton, avoiding blockage of the sound-absorbing medium, and ensuring that the silencer maintains a good sound absorption effect during long-term use, continuously and stably playing a noise reduction role. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the overall structure of the duct body of this utility model;

[0018] Figure 3 This is a cross-sectional schematic diagram of the overall structure of the silencing mechanism of this utility model;

[0019] Figure 4 This is a schematic diagram of the overall structure of the concave plate of this utility model;

[0020] Figure 5 This is a structural breakdown diagram of the installation mechanism of this utility model.

[0021] In the diagram: 1. Duct body; 2. Silencing mechanism; 3. Installation mechanism; 4. Square tube; 5. Mechanism housing; 6. Silencing cavity; 7. Silencing hole; 8. Non-woven fabric; 9. Fiberglass sound-absorbing cotton; 10. Concave plate; 11. First rotating hole; 12. Second rotating hole; 13. Guide bar; 14. Knob; 15. First rotating rod; 16. First bevel gear; 17. Screw; 18. Second rotating rod; 19. Second bevel gear; 20. L-shaped plate; 21. Screw hole; 22. Guide opening; 23. Movable plate; 24. Insert rod. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] like Figure 1 - Figure 5 As shown, a duct silencer includes a duct body 1, with a silencer mechanism 2 disposed between the duct bodies 1. The silencer mechanism 2 includes a mechanism housing 5, a non-woven fabric 8, and fiberglass sound-absorbing cotton 9. The non-woven fabric 8 is fixedly connected to the inside of the mechanism housing 5, and the fiberglass sound-absorbing cotton 9 is filled inside the mechanism housing 5. The silencer mechanism 2 is fixedly connected between the duct bodies 1 via a mounting mechanism 3. The mounting mechanism 3 includes a concave plate 10, a first bevel gear 16, a screw 17, a second bevel gear 19, an L-shaped plate 20, a movable plate 23, and a plug rod 24. The upper and lower surfaces of the mechanism housing 5 are divided into... A concave plate 10 is fixedly connected to the concave plate 10, and a first bevel gear 16 is movably connected to the concave plate 10 through a first rotating rod 15 on the top surface. A screw 17 is movably connected to the side wall of the concave plate 10 through a second rotating rod 18 at one end, and a second bevel gear 19 is fixedly connected to the other end of the second rotating rod 18 and meshes with the first bevel gear 16. An L-shaped plate 20 is movably connected to the screw 17 through a screw hole 21 on the side wall of the vertical part, and a movable plate 23 is fixedly connected to the bottom surface of the horizontal part of the L-shaped plate 20. A set of symmetrical insert rods 24 are fixedly connected to the inner side wall of the movable plate 23.

[0024] like Figure 2 As shown, a set of symmetrical square tubes 4 are fixedly installed on the top and bottom surfaces of one end of the duct body 1. The square tubes 4 serve as the insertion objects for the insertion rods 24 when installing the silencing mechanism 2. Together with the installation mechanism 3, the silencing mechanism 2 is connected and fixed to the duct body 1, which facilitates the assembly of the overall structure.

[0025] like Figure 3As shown, the housing 5 of the mechanism has a sound-absorbing cavity 6 inside, and the inner wall of the housing 5 has several sound-absorbing holes 7 that communicate with the sound-absorbing cavity 6 on its four sides. Non-woven fabric 8 is fixedly installed on the inner wall of the sound-absorbing cavity 6, and the sound-absorbing cavity 6 is also filled with glass fiber sound-absorbing cotton 9. After the airflow enters the sound-absorbing mechanism 2 through the duct body 1, the sound wave enters the sound-absorbing cavity 6 through the sound-absorbing holes 7. The porous structure of the sound-absorbing holes 7 in the sound-absorbing cavity 6 causes the sound wave to be continuously reflected, refracted and rubbed, which consumes the sound wave energy, effectively absorbs and attenuates the sound wave, reduces noise, and achieves a good sound-absorbing effect. In addition, the non-woven fabric 8 can block dust and other impurities from entering the glass fiber sound-absorbing cotton 9, extend the service life of the glass fiber sound-absorbing cotton 9, and maintain the stability of the sound-absorbing performance.

[0026] like Figure 4 As shown, a concave plate 10 is fixedly installed on the top and bottom surfaces of the housing 5 of the mechanism, and a first rotating hole 11 is opened on the top surface of the concave plate 10. The first rotating hole 11 is used to cooperate with the first rotating rod 15 to realize the rotation operation. A second rotating hole 12 is opened on the left and right side walls of the concave plate 10, and the second rotating hole 12 is used to cooperate with the second rotating rod 18 to realize the rotation operation. Guide bars 13 are also fixedly installed on the left and right side walls of the concave plate 10, and the guide bars 13 are used to cooperate with the second bevel gear 19 to play a moving guide role.

[0027] like Figure 5 As shown, a first rotating rod 15 is fixedly installed on the bottom surface of the knob 14 and movably installed in the first rotating hole 11. A first bevel gear 16 is fixedly installed at the bottom end of the first rotating rod 15. A second rotating rod 18 is fixedly installed at the opposite ends of the two screws 17. The second rotating rod 18 is movably installed in the second rotating hole 12. A second bevel gear 19 is fixedly installed on the inner end of the second rotating rod 18. The second bevel gear 19 and the first bevel gear 16 mesh together. Rotating the knob 14 drives the first bevel gear 16 to rotate through the first rotating rod 15. Under the rotational meshing action, the first bevel gear 16 drives the second bevel gears 19 on both sides to rotate. The second bevel gears 19 will drive the screws 17 to rotate through the second rotating rod 18, thereby providing a power source for the movement of the L-shaped plate 20.

[0028] like Figure 5As shown, the vertical sidewall of the L-shaped plate 20 is provided with screw holes 21, which are threaded together with the screw rod 17. The bottom surface of the vertical part of the L-shaped plate 20 is provided with a guide opening 22 corresponding to the guide bar 13. The bottom surface of the horizontal part of the L-shaped plate 20 is fixedly installed with a movable plate 23. A set of symmetrical insert rods 24 are fixedly installed on the inner sidewall of the movable plate 23 and inserted into the square tube 4. The L-shaped plate 20 moves inward along the screw rod 17 and the guide bar 13 through the screw holes 21 and the guide opening 22, and drives the movable plate 23 to move synchronously until the insert rods 24 are inserted into the square tube 4. The silencing mechanism 2 can be installed and fixed between the air duct body 1, thereby facilitating the disassembly and assembly of the silencing mechanism 2.

[0029] The specific operating principle of the mounting mechanism 3 in conjunction with the silencing mechanism 2 between the air duct body 1 is as follows:

[0030] After aligning the housing 5 between the duct bodies 1, rotate the knobs 14 located on the top and bottom surfaces of the housing 5 in sequence. The knobs 14 will cause the first rotating rod 15 to rotate within the first rotating hole 11 on the top surface of the concave plate 10. The first rotating rod 15 will then drive the first bevel gear 16 to rotate, causing the first bevel gear 16 to drive the second bevel gears 19 on both sides to rotate synchronously under the action of rotational meshing. The second bevel gears 19 will then drive the second rotating rod 18 to rotate within the second rotating holes 12 on the side walls of the concave plate 10. The second rotating rod 18 will then drive the screw 17 to rotate, causing the L-shaped plate 20 to pass through the screw holes 21 and guide openings 22 on the vertical side walls and bottom surface along the screw 17. The guide bar 13 moves in the opposite direction, and the L-shaped plate 20 drives the movable plate 23 installed on the bottom of the transverse part to move synchronously until the insertion rod 24 installed on the inner side wall of the movable plate 23 is inserted into the square tube 4 installed on the duct body 1, and the knob 14 can no longer be turned. Then the mechanism housing 5 can be installed and fixed between the duct bodies 1. Compared with the traditional bolt and nut installation method, there is no need for tedious hole-aligning and tightening operations, which greatly improves the installation efficiency and reduces the construction cost. When disassembling and maintaining, the knob 14 is turned in the opposite direction to pull the insertion rod 24 out of the square tube 4, and the silencer mechanism 2 can be easily disassembled from the duct body 1, which greatly improves the convenience of maintenance work.

[0031] The silencing mechanism 2 is installed via the mounting mechanism 3. When the airflow enters the housing 5 through the duct body 1, the sound waves enter the silencing cavity 6 through the silencing holes 7 on the four sides of the inner wall of the housing 5. The sound waves are continuously reflected, refracted, and rubbed in the porous structure of the glass fiber sound-absorbing cotton 9 filled in the silencing cavity 6, effectively consuming the sound wave energy and achieving efficient silencing. At the same time, when the airflow passes through the silencing holes 7 and enters the silencing cavity 6, the non-woven fabric 8 installed in the silencing cavity 6 can block dust and other impurities in the gas from entering the glass fiber sound-absorbing cotton 9, avoiding blockage of the sound-absorbing medium and ensuring that the silencer maintains a good silencing effect during long-term use, and continuously and stably plays a role in noise reduction.

[0032] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A duct silencer, comprising a duct body (1), characterized in that: A silencing mechanism (2) is provided between the duct bodies (1), and the silencing mechanism (2) includes a mechanism housing (5), non-woven fabric (8) and glass fiber sound-absorbing cotton (9). The non-woven fabric (8) is fixedly connected to the inside of the mechanism housing (5), and the glass fiber sound-absorbing cotton (9) is filled inside the mechanism housing (5). The silencing mechanism (2) is fixedly connected between the duct bodies (1) through an installation mechanism (3), and the installation mechanism (3) includes a concave plate (10), a first bevel gear (16), a screw (17), a second bevel gear (19), an L-shaped plate (20), a movable plate (23), and a plug rod (24). The upper and lower surfaces of the mechanism housing (5) are respectively fixedly connected to... A concave plate (10) is attached, and a first bevel gear (16) is movably connected to the concave plate (10) through a first rotating rod (15) on the top surface. The screw (17) is movably connected to the side wall of the concave plate (10) through a second rotating rod (18) at one end, and a second bevel gear (19) is fixedly connected to the other end of the second rotating rod (18) and meshes with the first bevel gear (16). The L-shaped plate (20) is movably connected to the screw (17) through a screw hole (21) on the side wall of the vertical part, and a movable plate (23) is fixedly connected to the bottom surface of the horizontal part of the L-shaped plate (20). A set of symmetrical insert rods (24) are fixedly connected to the inner side wall of the movable plate (23).

2. The duct silencer according to claim 1, characterized in that: A set of symmetrical square tubes (4) are fixedly installed on the top and bottom surfaces of one end of the duct body (1).

3. A duct silencer according to claim 2, characterized in that: The housing (5) of the mechanism has a sound-absorbing cavity (6) inside, and the inner wall of the housing (5) has several sound-absorbing holes (7) communicating with the sound-absorbing cavity (6) on its four sides. Non-woven fabric (8) is fixedly installed on the inner wall of the sound-absorbing cavity (6), and the inside of the sound-absorbing cavity (6) is also filled with glass fiber sound-absorbing cotton (9).

4. A duct silencer according to claim 3, characterized in that: The top and bottom surfaces of the housing (5) of the mechanism are respectively fixedly installed with concave plates (10), and the top surface of the concave plate (10) is provided with a first rotating hole (11). The left and right side walls of the concave plate (10) are respectively provided with second rotating holes (12), and guide bars (13) are respectively fixedly installed on the left and right side walls of the concave plate (10).

5. A duct silencer according to claim 4, characterized in that: A first rotating rod (15) is fixedly installed on the bottom surface of the knob (14) and movably installed in the first rotating hole (11). A first bevel gear (16) is fixedly installed at the bottom end of the first rotating rod (15). A second rotating rod (18) is fixedly installed at the opposite ends of the two screws (17). The second rotating rod (18) is movably installed in the second rotating hole (12). A second bevel gear (19) is fixedly installed on the inner end of the second rotating rod (18). The second bevel gear (19) and the first bevel gear (16) mesh together.

6. A duct silencer according to claim 5, characterized in that: The vertical sidewall of the L-shaped plate (20) is provided with a screw hole (21) and is threadedly connected to the screw rod (17) through the screw hole (21). The bottom surface of the vertical part of the L-shaped plate (20) is provided with a guide opening (22) corresponding to the guide bar (13). The bottom surface of the horizontal part of the L-shaped plate (20) is fixedly installed with a movable plate (23). A set of symmetrical insert rods (24) are fixedly installed on the inner sidewall of the movable plate (23) and inserted into the square tube (4).

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