Multi-stage impedance type silencer

Abstract

The utility model relates to the technical field of silencers and discloses a multistage impedance type silencer which comprises a shell, one side of the shell is connected with an air inlet pipe, one side, away from the air inlet pipe, of the shell is connected with an air outlet pipe, a cavity is formed in the shell, the cavity is provided with a plurality of sound insulation assemblies and a plurality of connecting assemblies, and the sound insulation assemblies are connected with the connecting assemblies. The multiple sound insulation assemblies communicate with one another through the multiple connecting assemblies, the air inlet pipe and the air outlet pipe communicate with one sound insulation assembly, each sound insulation assembly comprises a first silencing pipe, a plurality of first silencing holes are formed in each first silencing pipe, a first sound absorption film is attached to the inner pipe wall of each first silencing pipe, and a second sound absorption film is attached to the inner pipe wall of each first silencing pipe. And a second sound absorption film is arranged on the outer pipe wall of the first silencing pipe, the second sound absorption film is sleeved with a first diaphragm, and the device has the advantage that the silencing effect of the silencer is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of mufflers, in particular to a multi-stage impedance muffler. Background Art

[0002] A muffler is a device that allows air to pass through while effectively preventing or reducing the outward propagation of sound energy. It is mainly used for noise control in the intake and exhaust pipes or ventilation ducts of engineering machinery and equipment.

[0003] Traditional silencers include resistive silencers, reactive silencers and hybrid silencers. These silencers are all made of sound-absorbing materials or resonant sound-absorbing structures. The existing energy-saving and environmentally friendly noise-reducing silencers directly use sound-absorbing cotton or sound insulation pads to absorb or block noise. The silencer structure is single and usually cannot well take into account the low-frequency and high-frequency noise reduction requirements. Therefore, it is necessary to design a multi-stage impedance silencer to improve the noise reduction effect. Utility Model Content

[0004] The purpose of the present invention is to provide a multi-stage impedance muffler to address the existing technical defects and solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a multi-stage impedance silencer, comprising a shell, one side of the shell is connected to an air inlet pipe, and the side of the shell away from the air inlet pipe is connected to an air outlet pipe, a cavity is opened in the shell, and the cavity is provided with multiple sound insulation components and multiple connecting components, and the multiple sound insulation components are interconnected through multiple connecting components, and the air inlet pipe and the air outlet pipe are respectively connected to one of the sound insulation components, and each of the sound insulation components includes a silencer pipe, and a plurality of silencer holes are opened on the silencer pipe, the inner tube wall of the silencer pipe is adhered with a first sound-absorbing membrane, the outer tube wall of the silencer pipe is provided with a second sound-absorbing membrane, and the outer side of the second sound-absorbing membrane is provided with a diaphragm.

[0006] The utility model further describes that a first sound insulation board and a second sound insulation board are provided in the cavity, and the first sound insulation board and the second sound insulation board divide the cavity into a first sound insulation cavity, a second sound insulation cavity and a third sound insulation cavity in sequence from the side of the air inlet pipe to the side of the air outlet pipe, and two sound insulation components are provided in the first sound insulation cavity, the second sound insulation cavity and the third sound insulation cavity.

[0007] The present invention further describes that the multiple sound insulation components are a first sound insulation component, a second sound insulation component, a third sound insulation component, a fourth sound insulation component, a fifth sound insulation component and a sixth sound insulation component. The first sound insulation component is connected to the air inlet pipe, and the sixth sound insulation component is connected to the air outlet pipe.

[0008] The present utility model further describes that the first sound insulation component and the second sound insulation component are arranged in the first sound insulation cavity from bottom to top, the third sound insulation component and the fourth sound insulation component are arranged in the second sound insulation cavity from top to bottom, and the fifth sound insulation component and the sixth sound insulation component are arranged in the third sound insulation cavity from bottom to top.

[0009] The present invention further illustrates that the plurality of connection components are connection component one, connection component two, connection component three, connection component four and connection component five.

[0010] The utility model further describes that the connecting component one connects the first sound insulation component and the second sound insulation component, the connecting component two connects the second sound insulation component and the third sound insulation component, the connecting component three connects the third sound insulation component and the fourth sound insulation component, the connecting component four connects the fourth sound insulation component and the fifth sound insulation component, and the connecting component five connects the fifth sound insulation component and the sixth sound insulation component.

[0011] The utility model further describes that each of the connecting components includes a silencer pipe 2, a plurality of silencer holes 2 are opened on the silencer pipe 2, a third sound-absorbing membrane is adhered to the inner tube wall of the silencer pipe 2, a fourth sound-absorbing membrane is provided on the outer tube wall of the silencer pipe 2, and a diaphragm 2 is provided on the outer side of the fourth sound-absorbing membrane.

[0012] Compared with the prior art, the beneficial effect achieved by the present invention is as follows: the present invention performs preliminary sound absorption on the noise through the first sound-absorbing membrane, then reflects and attenuates the noise through the first sound-absorbing hole, then absorbs the noise for the second time through the second sound-absorbing membrane, and finally completely absorbs and isolates the noise through the sound insulation cavity, thereby achieving a multi-stage sound absorption and silencing effect.

[0013] By setting a curved flow path within a certain volume, the flow time of the airflow in the muffler is prolonged, thereby increasing the transmission time of the noise in the muffler and gradually weakening it during the transmission process.

[0014] Noise is reduced in sequence by arranging the first sound insulation cavity, the second sound insulation cavity and the third sound insulation cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

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

[0017] Figure 2 It is a front side cross-sectional structural schematic diagram of the present utility model;

[0018] Figure 3 It is a schematic diagram of the front and top side cross-sectional structure of the utility model;

[0019] Figure 4 This is a schematic diagram of the split structure of the sound insulation component and the connecting component of the utility model;

[0020] In the figure: 1. Shell; 2. Cavity; 3. Air inlet pipe; 4. Air outlet pipe; 5. First sound insulation board; 6. Second sound insulation board; 7. First sound insulation cavity; 8. Second sound insulation cavity; 9. Third sound insulation cavity; 10. First sound insulation component; 11. Second sound insulation component; 12. Third sound insulation component; 13. Fourth sound insulation component; 14. Fifth sound insulation component; 15. Sixth sound insulation component; 17. Silencer pipe one; 18. Silencer hole one; 19. Filter; 20. First sound-absorbing membrane; 21. Second sound-absorbing membrane; 22. Diaphragm one; 23. Connecting component one; 24. Connecting component two; 25. Connecting component three; 26. Connecting component four; 27. Connecting component five; 28. Silencer pipe two; 29. ​​Silencer hole two; 30. Third sound-absorbing membrane; 31. Fourth sound-absorbing membrane; 32. Diaphragm two. DETAILED DESCRIPTION

[0021] The following is a non-limiting detailed description of the technical solution of the present invention in conjunction with preferred embodiments and their accompanying drawings. Obviously, the described embodiments are only a portion of the embodiments of the present invention, and not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0022] See also Figure 1-4 The utility model provides a technical solution: a multi-stage impedance muffler, including a shell 1, a cavity 2 is opened in the shell 1, an air inlet pipe 3 is connected to one side of the shell 1, and an air outlet pipe 4 is connected to the side of the shell 1 away from the air inlet pipe 3, and the air inlet pipe 3 and the air outlet pipe 4 are both connected to the cavity 2.

[0023] The cavity 2 is provided with a plurality of sound insulation components and a plurality of connecting components. The plurality of sound insulation components are interconnected through the plurality of connecting components. The air inlet pipe 3 and the air outlet pipe 4 are respectively connected to one of the sound insulation components.

[0024] The plurality of sound insulation components are a first sound insulation component 10 , a second sound insulation component 11 , a third sound insulation component 12 , a fourth sound insulation component 13 , a fifth sound insulation component 14 and a sixth sound insulation component 15 .

[0025] The plurality of connection components include connection component one 23 , connection component two 24 , connection component three 25 , connection component four 26 and connection component five 27 .

[0026] A first sound insulation board 5 and a second sound insulation board 6 are arranged in the cavity 2. The first sound insulation board 5 and the second sound insulation board 6 are both arranged vertically. The first sound insulation board 5 is close to the side of the air inlet pipe 3, and the second sound insulation board 6 is close to the side of the air outlet pipe 4.

[0027] The first sound insulation board 5 and the second sound insulation board 6 divide the cavity 2 into a first sound insulation chamber 7, a second sound insulation chamber 8 and a third sound insulation chamber 9 in sequence from the side of the air inlet pipe 3 to the side of the air outlet pipe 4.

[0028] Two groups of sound insulation components are provided in each of the first sound insulation cavity 7 , the second sound insulation cavity 8 and the third sound insulation cavity 9 . The two sound insulation components are arranged up and down and on the same vertical line.

[0029] Among them, the two groups of sound insulation components in the first sound insulation cavity 7 are the first sound insulation component 10 and the second sound insulation component 11 from bottom to top, the two groups of sound insulation components in the second sound insulation cavity 8 are the third sound insulation component 12 and the fourth sound insulation component 13 from top to bottom, and the two groups of sound insulation components in the third sound insulation cavity 9 are the fifth sound insulation component 14 and the sixth sound insulation component 15 from bottom to top.

[0030] Among them, one end of the first sound insulation component 10 along the axial direction is connected to the intake pipe 3, and the intake pipe 3 passes through the sound insulation component and is connected to the inner cavity of the silencer pipe 17.

[0031] The connecting component 1 23 is connected to the end of the first sound insulation component 10 away from the air intake pipe 3 . The connecting component 1 23 is vertically arranged. The end of the connecting component 1 23 away from the first sound insulation component 10 is connected to the second sound insulation component 11 .

[0032] The second connecting component 24 is connected to an end of the second sound insulation component 11 away from the first connecting component 23 . The second connecting component 24 is horizontally arranged and passes through the first sound insulation board 5 to be connected to the third sound insulation component 12 .

[0033] The third connecting component 25 is connected to the end of the third sound insulation component 12 away from the second connecting component 24 . The third connecting component 25 is vertically arranged. The end of the third connecting component 25 away from the third sound insulation component 12 is connected to the fourth sound insulation component 13 .

[0034] The fourth connecting component 26 is connected to the end of the fourth sound insulation component 13 away from the fourth connecting component 26. The fourth connecting component 26 is arranged horizontally. The fourth connecting component 26 passes through the second sound insulation board 6 and is connected to the fifth sound insulation component 14.

[0035] The connecting component five 27 is connected to the end of the fifth sound insulation component 14 away from the connecting component four 26. The connecting component five 27 is vertically arranged. The end of the connecting component five 27 away from the fifth sound insulation component 14 is connected to the sixth sound insulation component 15. The end of the sixth sound insulation component 15 away from the connecting component five 27 is connected to the exhaust pipe 4.

[0036] Each sound insulation component includes a silencer pipe 17, which is arranged horizontally, and the two ends of the silencer pipe 17 along the axial direction are sealed and connected to the inner wall of the cavity 2.

[0037] The silencer pipe 17 is provided with a plurality of silencer holes 18 , which are evenly distributed in a circle with the axis of the silencer pipe 17 as the center and arranged in a linear array along the axis of the silencer pipe 17 .

[0038] Several filters 19 are provided in the silencer pipe 17. The cross-sectional shape of the filter 19 is consistent with the radial cross-sectional shape of the inner cavity of the silencer pipe 17, thereby filtering dust from the air entering the silencer pipe 17. At the same time, the filter 19 has a certain reflective effect on noise.

[0039] The inner wall of the silencer tube 17 is adhered with a first sound-absorbing membrane 20 for initially absorbing the noise entering the silencer tube 17 .

[0040] The outer wall of the silencer pipe 17 is provided with a second sound-absorbing membrane 21 for secondary absorption of the noise reflected by the silencer hole 18 .

[0041] A diaphragm 22 is provided on the outside of the second sound-absorbing membrane 21 to seal the silencer pipe 17 to prevent gas from escaping and to reflect noise to a certain extent.

[0042] Each connecting assembly includes a second silencer pipe 28, which is provided with a plurality of second silencer holes 29. The plurality of second silencer holes 29 are evenly distributed in a circle around the axis of the second silencer pipe 28 and arranged in a linear array along the axis of the second silencer pipe 28.

[0043] A third sound-absorbing membrane 30 is attached to the inner wall of the second silencer pipe 28 to initially absorb the noise entering the second silencer pipe 29 .

[0044] A fourth sound-absorbing membrane 31 is provided on the outer wall of the second silencer pipe 28 for secondary absorption of the noise reflected by the second silencer hole 29 .

[0045] A second diaphragm 32 is provided on the outer side of the fourth sound-absorbing membrane 31 to seal the second silencer pipe 28 to prevent gas from escaping and to reflect noise to a certain extent.

[0046] The sound insulation cavity is filled with sound-absorbing cotton, and the inner wall of the cavity 2 can be coated with a paint that reflects or absorbs noise to further absorb the noise.

[0047] In this embodiment, the gas enters the shell 1 through the air inlet pipe 3, flows through multiple sound insulation components and connecting components, and finally flows out through the air outlet pipe 4. At the same time, during the process, after the initial sound absorption by the first sound absorbing membrane 20 and the third sound absorbing membrane 30, the noise is reflected and attenuated through the sound-absorbing hole 18 and the sound-absorbing hole 2 29.

[0048] Then, after secondary sound absorption by the second sound-absorbing membrane 21 and the fourth sound-absorbing membrane 31, the noise is further attenuated. Finally, through the action of the sound insulation cavity and the sound-absorbing cotton, the noise is completely absorbed and isolated, thereby improving the noise reduction effect of the muffler.

[0049] By setting a curved flow path within a certain volume, the flow time of the airflow in the muffler is prolonged, thereby increasing the transmission time of the noise in the muffler and gradually weakening it during the transmission process.

[0050] The noise is reduced in sequence through the first sound insulation cavity 7, the second sound insulation cavity 8 and the third sound insulation cavity 9.

[0051] At the same time, when the noise passes through multiple bends with the airflow, it comes into contact with the components inside the muffler and is reflected, which disperses the intensity of the noise and changes the direction of noise transmission, thereby improving the noise attenuation effect.

[0052] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only used to facilitate the description of the present invention, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0053] Finally, it should be pointed out that the above embodiments are intended only to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art will appreciate that modifications may be made to the technical solutions described in the above embodiments, or that some of the technical features may be replaced with equivalents. Such modifications or replacements do not deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A multi-stage impedance muffler, characterized in that: The invention comprises a shell (1), wherein one side of the shell (1) is connected to an air inlet pipe (3), and the side of the shell (1) away from the air inlet pipe (3) is connected to an air outlet pipe (4), and a cavity (2) is provided in the shell (1), and the cavity (2) is provided with a plurality of sound insulation components and a plurality of connection components, and the plurality of sound insulation components are interconnected through the plurality of connection components, and the air inlet pipe (3) and the air outlet pipe (4) are respectively connected to one of the sound insulation components, and each of the sound insulation components comprises a silencer pipe (17), and the silencer pipe (17) is provided with a plurality of silencer holes (18), the inner tube wall of the silencer pipe (17) is adhered with a first sound absorbing membrane (20), the outer tube wall of the silencer pipe (17) is provided with a second sound absorbing membrane (21), and the outer side of the second sound absorbing membrane (21) is provided with a diaphragm (22).

2. The multi-stage impedance muffler according to claim 1, characterized in that: A first sound insulation board (5) and a second sound insulation board (6) are provided in the cavity (2); the first sound insulation board (5) and the second sound insulation board (6) sequentially separate the cavity (2) from the side of the air inlet pipe (3) to the side of the air outlet pipe (4) into a first sound insulation cavity (7), a second sound insulation cavity (8) and a third sound insulation cavity (9); and two sound insulation components are provided in each of the first sound insulation cavity (7), the second sound insulation cavity (8) and the third sound insulation cavity (9).

3. The multi-stage impedance muffler according to claim 1, characterized in that: The plurality of sound insulation components are a first sound insulation component (10), a second sound insulation component (11), a third sound insulation component (12), a fourth sound insulation component (13), a fifth sound insulation component (14) and a sixth sound insulation component (15), wherein the first sound insulation component (10) is connected to the air inlet pipe (3), and the sixth sound insulation component (15) is connected to the air outlet pipe (4).

4. The multi-stage impedance muffler according to claim 3, characterized in that: The first sound insulation component (10) and the second sound insulation component (11) are arranged from bottom to top in the first sound insulation cavity (7), the third sound insulation component (12) and the fourth sound insulation component (13) are arranged from top to bottom in the second sound insulation cavity (8), and the fifth sound insulation component (14) and the sixth sound insulation component (15) are arranged from bottom to top in the third sound insulation cavity (9).

5. The multi-stage impedance muffler according to claim 1, characterized in that: The plurality of connection components are connection component one (23), connection component two (24), connection component three (25), connection component four (26) and connection component five (27).

6. The multi-stage impedance muffler according to claim 5, characterized in that: The connecting component one (23) connects the first sound insulation component (10) and the second sound insulation component (11), the connecting component two (24) connects the second sound insulation component (11) and the third sound insulation component (12), the connecting component three (25) connects the third sound insulation component (12) and the fourth sound insulation component (13), the connecting component four (26) connects the fourth sound insulation component (13) and the fifth sound insulation component (14), and the connecting component five (27) connects the fifth sound insulation component (14) and the sixth sound insulation component (15).

7. The multi-stage impedance muffler according to claim 6, characterized in that: Each of the connecting components includes a second silencer pipe (28), a plurality of second silencer holes (29) are provided on the second silencer pipe (28), a third sound-absorbing membrane (30) is attached to the inner wall of the second silencer pipe (28), a fourth sound-absorbing membrane (31) is provided on the outer wall of the second silencer pipe (28), and a second diaphragm (32) is provided on the outer side of the fourth sound-absorbing membrane (31).

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