A sound-absorbing pipe

Abstract

A sound-absorbing pipe, comprising a sound-absorbing sleeve housing for installing various components, an intake sound-absorbing cylinder, a front sound-absorbing cylinder, a rear sound-absorbing cylinder and an air flow acceleration cylinder. The air flow at the intake end is decelerated through the intake sound-absorbing pipe, and part of the noise at the air intake end is adsorbed. Through the settings of the front sound-absorbing cylinder and the rear sound-absorbing cylinder, most of the wind noise generated by the fresh air system is adsorbed. Finally, through the air flow acceleration cylinder, the speed of the noise-reduced air flow is increased, so that the sound-absorbing pipe does not reduce the air flow velocity while reducing noise.

Description

Technical Field

[0001] The present invention relates to the field of silencing pipes for ventilation ducts, and particularly to a silencing pipe. Background Art

[0002] With the development of industry and the serious pollution of the human living environment, fresh air fans and air conditioners have become popular globally. Air conditioning and fresh air have become essential requirements for human life. Currently, the fresh air systems on the market are mainly divided into two types: ducted fresh air systems and ductless fresh air systems. The ducted fresh air system consists of a fresh air fan and duct accessories. The fresh air fan purifies outdoor air and introduces it into the room, and the indoor air is discharged through the duct; the ductless fresh air system consists of a fresh air fan, and the fresh air fan also purifies outdoor air and introduces it into the room. The ducted fresh air system is more suitable for industrial use, large - area office areas or classrooms due to the large amount of work. When the fresh air system is used in an office area or a classroom, it is necessary to minimize noise as much as possible to prevent the noise generated during the operation of the fresh air system from affecting the work and study of indoor personnel.

[0003] Currently, the silencing measures for fresh air systems on the market include the following: (1) Wrapping the fresh air pipeline with sound - absorbing cotton, which makes the diameter of the silencing pipeline larger, increases the floor area of the fresh air system, and has a poor silencing effect; (2) Using a silencer with sound - absorbing cotton. This type of silencer has a general silencing effect, but it is easy to cause air volume loss in the fresh air system and reduce the purification effect of the fresh air system. Summary of the Invention

[0004] Aiming at the above - mentioned deficiencies, the technical problem to be solved by the present invention is to provide a silencing pipe with good silencing effect and no air volume loss.

[0005] To solve the above - mentioned technical problems, the technical solution adopted by the present invention is

[0006] A silencing pipe, comprising a silencing sleeve housing, an intake silencing cylinder, a front - stage silencing cylinder, a rear - stage silencing cylinder and an air - flow accelerating cylinder. The intake silencing cylinder, the front - stage silencing cylinder and the rear - stage silencing cylinder are sequentially and fixedly installed in the silencing pipe housing. The air - flow accelerating cylinder is installed in the rear - stage silencing cylinder. A rear - stage silencing member is also fixedly installed in the rear - stage silencing cylinder, and an exhaust gap is provided between the rear - stage silencing member and the air - flow accelerating cylinder.

[0007] Furthermore, the silencing sleeve housing includes an intake interface, a silencing sleeve and an outlet interface. The intake interface and the outlet interface are respectively fixedly connected to both ends of the silencing sleeve. The intake silencing cylinder is fixedly installed in the intake interface, and the front - stage silencing cylinder, the rear - stage silencing cylinder and the air - flow accelerating cylinder are fixedly installed in the silencing sleeve.

[0008] Furthermore, the intake silencing cylinder includes an intake cylinder body and an intake fluff member. The intake cylinder body is installed in the intake interface, and the intake fluff member is fixedly installed in the intake cylinder body.

[0009] Further, the front muffler cylinder includes a front housing and front sound-absorbing cotton. The front sound-absorbing cotton is fixedly installed inside the front housing. An air inlet port and an air outlet port are provided inside the front housing. The air inlet port is connected to the intake muffler cylinder, and the air outlet port is arranged facing the rear muffler cylinder.

[0010] Further, one air inlet port and three air outlet ports are fixedly installed inside the front housing. The diameter ratio of the air inlet port to the air outlet port is 1.4 - 1.1:1. An interleaved area is provided between the air inlet port and the air outlet port, and the front sound-absorbing cotton is fixedly installed in the interleaved area.

[0011] Further, a flow guiding surface is dug on the rear muffling member. The flow guiding surface is arranged facing the front muffler cylinder. A noise reduction channel is dug inside the rear muffling member. The noise reduction channel includes an intake channel and an exhaust channel that communicate with each other. The intake channel is connected to the flow guiding surface.

[0012] Further, one intake channel and three exhaust channels are dug inside the rear muffling member. The diameter of the intake channel gradually becomes smaller from the intake end to the exhaust channel. An exhaust balloon cavity is dug inside the exhaust channel.

[0013] Further, an air flow cavity is provided between the intake channel and the exhaust channel. A flow guiding arc surface is provided between the intake channel and the air flow cavity. A flow guiding inclined surface is provided between the exhaust channel and the air flow cavity.

[0014] Further, a limiting ring is provided inside the rear muffler cylinder. The rear muffler cylinder forms a rear muffling cavity and an air flow acceleration cavity on both sides of the limiting ring. The rear muffling member and the air flow acceleration cylinder are respectively installed in the rear muffling cavity and the air flow acceleration cavity. A Tesla valve is fixedly installed inside the air flow acceleration cylinder. The opening of the Tesla valve is on the same straight line as the air outlet of the exhaust channel.

[0015] Further, the Tesla valve is inclined with respect to the axis of the muffling sleeve housing, and the air outlet of the Tesla valve is arranged facing the opening of the air outlet interface.

[0016] The beneficial effects of the present invention are as follows: (1) The air flow at the intake end is decelerated by the intake muffler pipe, and part of the noise at the air inlet end is adsorbed. Through the settings of the front muffler cylinder and the rear muffler cylinder, most of the wind noise generated by the fresh air system is adsorbed. Finally, through the air flow acceleration cylinder, the noise-reduced air flow is accelerated, so that the muffler pipe does not reduce the air flow velocity while reducing noise.

[0017] (2) By installing the rear muffling member and the air flow acceleration cylinder through the rear muffler cylinder, the installation efficiency of the components is effectively improved.

[0018] (3) By setting the exhaust gap, the distance between the rear silencing member and the air flow acceleration cylinder is increased, the pressure between the rear silencing member and the air flow acceleration cylinder is reduced, the shaking of the rear silencing member and the air flow acceleration cylinder is prevented, and the noise reduction effect is improved. Brief Description of the Drawings

[0019] Figure 1 is a cross-sectional view of the present muffler.

[0020] Figure 2 is a structural schematic diagram of the present muffler.

[0021] Reference Signs: Silencing sleeve housing 1, intake silencing cylinder 2, front silencing cylinder 3, rear silencing cylinder 4, air flow acceleration cylinder 5, rear silencing member 6, exhaust gap 7, intake interface 8, silencing sleeve housing 9, outlet interface 10, intake cylinder body 11, intake fluff member 12, front housing 13, front silencing cotton 14, intake pipe orifice 15, outlet pipe orifice 16, staggered area 19, flow guiding surface 20, noise reduction duct 21, intake passage 22, outlet passage 23, outlet balloon cavity 24, air flow cavity 25, flow guiding arc surface 26, flow guiding inclined surface 27, limiting ring 28, rear silencing cavity 29, air flow acceleration cavity 30, Tesla valve 31. Detailed Embodiment

[0022] The present invention will be further described below with reference to the drawings.

[0023] A silencing pipe includes a silencing sleeve housing 1 for installing various components, an intake silencing cylinder 2, a front silencing cylinder 3, a rear silencing cylinder 4, and an air flow acceleration cylinder 5. The air flow at the intake end is decelerated by the intake silencing cylinder 2, and part of the noise at the intake end is adsorbed. Through the settings of the front silencing cylinder 3 and the rear silencing cylinder, most of the wind noise generated by the fresh air system is adsorbed. Finally, the air flow after noise reduction is accelerated by the air flow acceleration cylinder 5, so that the silencing pipe does not reduce the air flow velocity while reducing noise.

[0024] The intake silencing cylinder 2, the front silencing cylinder 3, and the rear silencing cylinder 4 are sequentially and fixedly installed in the silencing pipe housing 1. The air flow acceleration cylinder 5 is installed in the rear silencing cylinder 4. A rear silencing member 6 is also fixedly installed in the rear silencing cylinder 4. Since the length of the silencing sleeve housing 1 is relatively large, it is not conducive to the installation of the rear silencing member 6 in the middle of the silencing sleeve housing 1. By installing the rear silencing member 6 and the air flow acceleration cylinder 5 through the rear silencing cylinder 4, the installation efficiency of the components is effectively improved. An exhaust gap 7 is provided between the rear silencing member 6 and the air flow acceleration cylinder 5. By setting the exhaust gap 7, the distance between the rear silencing member 6 and the air flow acceleration cylinder 5 is increased, preventing the distance between the rear silencing member 6 and the air flow acceleration cylinder 5 from being too small and the gas flow velocity from being too fast, resulting in excessive pressure between the rear silencing member 6 and the air flow acceleration cylinder 5 and causing the rear silencing member 6 and the air flow acceleration cylinder 5 to shake, affecting the noise reduction effect.

[0025] The muffling sleeve housing 1 includes an air inlet interface 8, a muffling sleeve housing 9, and an air outlet interface 10. The air inlet interface 8 and the air outlet interface 9 are respectively fixedly connected to both ends of the muffling sleeve housing 9. The inlet muffling cylinder 2 is fixedly installed in the air inlet interface 8. The front muffling cylinder 3, the rear muffling cylinder 4, and the air flow acceleration cylinder 5 are fixedly installed in the muffling sleeve housing 9. This muffling pipe is fixedly installed in the fresh air system through the air inlet interface 8 and the air outlet interface 10.

[0026] The inlet muffling cylinder 2 includes an inlet cylinder body 11 and an inlet fluff member 12. The inlet cylinder body 11 is installed in the air inlet interface 8, and the inlet fluff member 12 is fixedly installed in the inlet cylinder body 11. Preferably, the inlet fluff member 12 is made of animal fluff (such as wool, rabbit hair), and the animal fluff contains tiny air pores, which is convenient for sound absorption and noise reduction.

[0027] The front muffling cylinder 3 includes a front housing 13 and a front muffling cotton 14. The front muffling cotton 14 is fixedly installed in the front housing 13. Through the setting of the front muffling cotton 14, the air flow velocity can be reduced, and the wind noise in the front muffling cylinder 3 can be adsorbed. An air inlet port 15 and an air outlet port 16 are provided in the front housing 13. The air inlet port 15 is connected to the inlet muffling cylinder 11. That is, the air flow flowing through the inlet muffling cylinder 11 directly flows into the air inlet port 15. The air outlet port 16 is arranged towards the rear muffling cylinder 4. Through the labyrinthine pipeline setting, it is convenient to absorb the wind noise in the air flow.

[0028] One air inlet port 15 and three air outlet ports 16 are fixedly installed in the front housing 13. The diameter ratio of the air inlet port 15 to the air outlet port 16 is 1.4 - 1.1:1. An intersection area 19 is provided between the air inlet port 15 and the air outlet port 16. The front muffling cotton 14 is fixedly installed in the intersection area 19. Through the setting of the intersection area 19, it is prevented that the air flow flowing into the air inlet port 15 directly flows out from the air outlet port 16, and the muffling effect of the labyrinthine front muffling cylinder 3 is improved.

[0029] A diversion surface 20 is dug on the rear muffling member 6. The diversion surface 20 is arranged towards the front muffling cylinder 3. Through the setting of the diversion surface 20, it is convenient to divert the air flow and prevent the air flow from hitting and generating wind noise. A noise reduction channel 21 is dug in the rear muffling member 6. The noise reduction channel 21 includes an air inlet channel 22 and an air outlet channel 23 that are connected to each other. The air inlet channel 22 is connected to the diversion surface 20. Through the air inlet channel 22 and the air outlet channel 23, the wind noise is further adsorbed.

[0030] An air intake channel 22 and three air outlet channels 23 are dug inside the rear silencing member 6. The diameter of the air intake channel 22 gradually decreases from the air intake end to the air outlet channels. An air outlet balloon cavity 24 is dug inside the air outlet channel 23. Through the setting of the air outlet balloon cavity 24, it is convenient to further adsorb wind noise. Preferably, the rear silencing member 6 is made of sound-absorbing cotton material, and a small part of the air flow can directly pass through the rear silencing member 6, which can reduce the loss of the air flow rate inside the silencer.

[0031] An air flow cavity 25 is provided between the air intake channel 22 and the air outlet channel 23. A guiding arc surface 26 is provided between the air intake channel 22 and the air flow cavity 25, and a guiding inclined surface 27 is provided between the air outlet channel 23 and the air flow cavity 25. Through the settings of the guiding arc surface 26 and the guiding inclined surface 27, it is convenient to guide the air flow inside the rear silencing member 6, thereby reducing the formation of wind noise.

[0032] A limiting ring 28 is provided inside the rear silencing cylinder 5. The rear silencing cylinder 5 forms a rear silencing cavity 29 and an air flow acceleration cavity 30 on both sides of the limiting ring 28. Through the setting of the limiting ring 28, it is convenient to position and install the rear silencing member 6 and the air flow acceleration cylinder 5, improving the installation efficiency and installation accuracy. The rear silencing member 6 and the air flow acceleration cylinder 5 are respectively installed inside the rear silencing cavity 29 and the air flow acceleration cavity 30. A Tesla valve 31 is fixedly installed inside the air flow acceleration cylinder 5. The opening of the Tesla valve 31 is on the same straight line as the air outlet of the air outlet channel 23, which is convenient for the air flow to directly flow into the Tesla valve 31 and prevents the air flow from generating wind noise inside the air flow cavity 25.

[0033] The Tesla valve 31 is inclined relative to the axis of the silencing sleeve housing 1, and the air outlet of the Tesla valve 31 is arranged towards the opening of the air outlet interface 10, preventing the air flow accelerated by the Tesla valve 31 from colliding with the side wall of the air outlet interface 10 to generate wind noise, and preventing the accelerated air flow from being blocked by the air outlet interface 10 and reducing the wind speed.

[0034] This silencer was installed in the fresh air system for testing, and the following control groups were set for comparison. The test results are shown in the following table;

[0035] Noise [dB(A)] Fresh air system installed with this muffler 42.3 Fresh air system not installed with this muffler 90.6 Fresh air system installed with a common muffler 66.8

[0036] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention; therefore, the present invention will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

[0037] Although this article uses more terms corresponding to the figure marks in the figures, it does not exclude the possibility of using other terms; these terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations is contrary to the spirit of the present invention.

Claims

1. A sound-absorbing pipe, characterized in that, It includes a silencing sleeve housing (1), an intake silencing cylinder (2), a front silencing cylinder (3), a rear silencing cylinder (4) and an air flow acceleration cylinder (5). The intake silencing cylinder (2), the front silencing cylinder (3) and the rear silencing cylinder (4) are successively and fixedly installed in the silencing pipe housing. The air flow acceleration cylinder (5) is installed in the rear silencing cylinder (4). A rear silencing member (6) is also fixedly installed in the rear silencing cylinder (4). An exhaust gap (7) is provided between the rear silencing member (6) and the air flow acceleration cylinder (5). The silencing sleeve housing (1) includes an intake interface (8), a silencing sleeve housing (9) and an outlet interface (10). The intake interface (8) and the outlet interface (10) are respectively and fixedly connected to both ends of the silencing sleeve housing (9). The intake silencing cylinder (2) is fixedly installed in the intake interface (8). The front silencing cylinder (3), the rear silencing cylinder (4) and the air flow acceleration cylinder (5) are fixedly installed in the silencing sleeve housing (9). A guiding surface (20) is dug on the rear silencing member (6). The guiding surface (20) is arranged towards the front silencing cylinder (3). A noise reduction channel (21) is dug in the rear silencing member (6). The noise reduction channel (21) includes an intake channel (22) and an outlet channel (23) which are communicated with each other. The intake channel (22) is connected to the guiding surface (20).

2. The sound-absorbing pipe according to claim 1, characterized in that, The intake silencing cylinder (2) includes an intake cylinder body (11) and an intake fluff member (12). The intake cylinder body (11) is installed in the intake interface (8). The intake fluff member (12) is fixedly installed in the intake cylinder body (11).

3. The silencing pipe according to claim 1, characterized in that, The front silencing cylinder (3) includes a front housing (13) and front silencing cotton (14). The front silencing cotton (14) is fixedly installed in the front housing (13). An air inlet port (15) and an air outlet port (16) are provided in the front housing (13). The air inlet port (15) is connected to the intake silencing cylinder (2). The air outlet port (16) is arranged towards the rear silencing cylinder (4).

4. The silencing pipe according to claim 3, characterized in that, One air inlet port (15) and three air outlet ports (16) are fixedly installed in the front housing (13). The diameter ratio of the air inlet port (15) to the air outlet port (16) is 1.4 - 1.1:

1. An interleaved area (19) is provided between the air inlet port (15) and the air outlet port (16). The front silencing cotton (14) is fixedly installed in the interleaved area (19).

5. A sound-absorbing pipe according to claim 1, characterized in that, One intake channel (22) and three outlet channels (23) are dug in the rear silencing member (6). The diameter of the intake channel (22) gradually becomes smaller from the intake end to the outlet channels (23). An outlet balloon cavity (24) is dug in the outlet channels (23).

6. The silencing pipe according to claim 5, characterized in that, An air flow cavity (25) is provided between the intake channel (22) and the outlet channels (23). A guiding arc surface (26) is provided between the intake channel (22) and the air flow cavity (25). A guiding inclined surface (27) is provided between the outlet channels (23) and the air flow cavity (25).

7. The silencing pipe according to claim 5, characterized in that, A limiting ring (28) is provided inside the rear muffler cylinder (4). The rear muffler cylinder (4) forms a rear muffler cavity (29) and an air flow acceleration cavity (30) on both sides of the limiting ring (28). A rear muffler member (6) and an air flow acceleration cylinder (5) are respectively installed in the rear muffler cavity (29) and the air flow acceleration cavity (30). A Tesla valve (31) is fixedly installed inside the air flow acceleration cylinder (5), and the opening of the Tesla valve (31) is on the same straight line as the air outlet of the air outlet passage (23).

8. A sound-absorbing pipe according to claim 7, characterized in that, The Tesla valve (31) is inclined relative to the axis of the muffler sleeve housing (1), and the air outlet of the Tesla valve (31) is arranged towards the opening of the air outlet interface (10).

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