Airflow noise reduction system for oil-free compressor

Abstract

The airflow noise reduction system for the oil-free compressor comprises a barrel, the inner wall of the barrel is coated with a sound absorption material, one end of the barrel is provided with a detachable end cover, and the other end of the barrel is provided with an air outlet; an air inlet silencing pipe is detachably mounted on the side wall of the barrel, one end of the air inlet silencing pipe extends out of the barrel to form an air inlet, the other end of the air inlet silencing pipe is inserted into the barrel, and a plurality of silencing holes are formed in the pipe wall; the low and medium frequency noise can be reduced through the air inlet silencing pipe, and the high frequency noise is absorbed through the sound absorbing material, so that the aerodynamic noise of the oil-free compressor is reduced; and the noise reduction capability and the pressure drop of the noise reduction system can be adjusted by replacing the air inlet silencing pipe and the sound absorption material, so that the pressure loss and the airflow resistance are balanced while the proper noise reduction effect is achieved, and the noise reduction system can adapt to different noise control requirements.

Description

Technical Field

[0001] The utility model relates to the technical field of compressors, and particularly relates to an air flow noise reduction system for an oil-free compressor. Background Art

[0002] Compared with oiled compressors, oil-free compressors are more likely to generate noise problems during operation due to the lack of the cooling and vibration damping effects of lubricating oil. The noise of oil-free compressors mainly comes from mechanical vibration noise and pneumatic noise. Among them, mechanical vibration noise is usually generated by the force on moving parts such as rotors during operation and is transmitted outward through structural parts such as bearings and casings, while pneumatic noise mainly comes from the periodic intake and exhaust processes of the compressor and the airflow pulsation noise generated during the gas compression and flow processes. Summary of the Utility Model

[0003] In view of this, an embodiment of the utility model provides an air flow noise reduction system for an oil-free compressor to reduce the pneumatic noise of the oil-free compressor.

[0004] An air flow noise reduction system for an oil-free compressor provided by an embodiment of the utility model includes a cylinder body, the inner wall of the cylinder body is coated with a sound-absorbing material, one end of the cylinder body is provided with a detachable end cover, and the other end of the cylinder body is provided with an air outlet communicating with its inner cavity; an intake silencing pipe is detachably installed on the side wall of the cylinder body, one end of the intake silencing pipe extends out of the cylinder body to form an air inlet, and the other end of the intake silencing pipe is inserted into the cylinder body and a plurality of sound-absorbing holes communicating with the inner cavity of the cylinder body are opened on the pipe wall.

[0005] Optionally, the end cover is detachably connected to the cylinder body by bolts, and a sealing ring is arranged between the end cover and the cylinder body.

[0006] Optionally, a connecting plate is fixedly arranged on the pipe wall of the intake silencing pipe, the connecting plate is detachably connected to the cylinder body by bolts, and a sealing gasket is arranged between the connecting plate and the cylinder body.

[0007] Optionally, both the air inlet and the air outlet are provided with connecting flanges.

[0008] Optionally, a pressure relief valve interface communicating with the inner cavity of the cylinder body is arranged on the side wall of the cylinder body.

[0009] The embodiment of the utility model has the following beneficial effects:

[0010] 1. An intake silencing pipe is installed on the side wall of the cylinder body, and a sound-absorbing material is coated on the inner wall of the cylinder body. During the process that the gas enters the cylinder body through the intake silencing pipe and then is discharged from the air outlet, the medium and low frequency noise can be reduced through the intake silencing pipe, and the high frequency noise can be absorbed by the sound-absorbing material, thereby effectively reducing the pneumatic noise of the oil-free compressor.

[0011] 2. The intake silencing pipe and sound-absorbing material can be replaced quickly and conveniently. By replacing the intake silencing pipe and sound-absorbing material, the noise reduction ability and pressure drop of the noise reduction system can be adjusted to balance the pressure loss and air flow resistance while achieving a suitable noise reduction effect, so that it can adapt to different noise control requirements. At the same time, this quick replacement function also helps to maintain the efficient operation of the noise reduction system and extend its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0013] Figure 1 is a schematic internal structure diagram of an embodiment of the present invention;

[0014] Figure 2 is a schematic exploded structure diagram of an embodiment of the present invention;

[0015] The numbers in the figures represent:

[0016] 1. Cylinder body; 2. End cover; 3. Air outlet; 4. Sound-absorbing material; 5. Intake silencing pipe; 6. Intake port; 7. Sound-absorbing hole; 8. Sealing ring; 9. Connecting plate; 10. Sealing gasket; 11. Connecting flange; 12. Relief valve interface. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present invention.

[0018] Please refer to Figure 1 , Figure 2As shown in the figure, an embodiment of the present utility model provides an air flow noise reduction system for an oil-free compressor, which includes a cylinder body 1. One end of the cylinder body 1 is provided with a detachable end cover 2, and the other end of the cylinder body 1 is provided with an air outlet 3 communicating with its inner cavity. The inner wall of the cylinder body 1 is coated with a sound-absorbing material 4 for absorbing high-frequency noise. By removing the end cover 2, the sound-absorbing material 4 inside the cylinder body 1 can be quickly replaced. An intake silencing pipe 5 is detachably installed on the side wall of the cylinder body 1. One end of the intake silencing pipe 5 extends outside the cylinder body 1 to form an air inlet 6, and the other end of the intake silencing pipe 5 is inserted into the cylinder body 1 and a plurality of sound-absorbing holes 7 communicating with the inner cavity of the cylinder body 1 are opened on the pipe wall. Gas can enter the intake silencing pipe 5 from the air inlet 6, reduce medium and low-frequency noise through the sound-absorbing holes 7 and then enter the inner cavity of the cylinder body 1, and then be discharged from the air outlet 3 after the high-frequency noise is absorbed by the sound-absorbing material 4 in the cylinder body 1, thereby effectively reducing the pneumatic noise.

[0019] It can be understood that the noise reduction ability of the intake silencing pipe 5 is closely related to the opening area of its sound-absorbing holes 7. When the opening is small, more reflections, resonances and interferences of sound waves will occur, thus being able to reduce medium and low-frequency noise. However, at the same time, a large pressure drop will be generated. And if the opening area is blindly reduced, the gas may change from laminar flow to turbulent flow, thereby affecting the gas efficiency and noise level. When the opening is large, the noise reduction effect of the intake silencing pipe 5 will decline, and at the same time, the air flow resistance will also be reduced, affecting the control, regulation and stability of the fluid. Therefore, the intake silencing pipe 5 with different opening areas and the sound-absorbing material 4 with different materials can be replaced according to actual usage needs, so as to adjust the noise reduction ability and pressure drop of the noise reduction system, so that it can balance the pressure loss and air flow resistance while achieving a suitable noise reduction effect, and ensure that the noise reduction system can adapt to different noise control requirements. At the same time, the detachable and replaceable sound-absorbing material 4 and intake silencing pipe 5 also facilitate the maintenance and repair of the noise reduction system by the staff, which helps to keep the noise reduction system running efficiently and extend its service life.

[0020] As an optional implementation manner, the end cover 2 in the embodiment of the present utility model is detachably connected to the cylinder body 1 by bolts. A sealing ring 8 is arranged between the end cover 2 and the cylinder body 1 to ensure the airtightness between the two. A connecting plate 9 is fixedly arranged on the pipe wall of the intake silencing pipe 5. The connecting plate 9 is detachably connected to the cylinder body 1 by bolts. A sealing gasket 10 is arranged between the connecting plate 9 and the cylinder body 1 to ensure the airtightness between the two. Of course, the end cover 2 and the intake silencing pipe 5 can also be detachably connected to the cylinder body 1 by means of threaded connection, snap connection, etc., and the embodiments of the present utility model will not list them one by one.

[0021] Furthermore, connecting flanges 11 are provided at both the air inlet 6 and the air outlet 3 of the cylinder body 1, and it can be connected to the air inlet end or the exhaust end of the oil-free compressor through the connecting flanges 11, thereby reducing the pneumatic noise of the oil-free compressor. A pressure relief valve interface 12 communicating with its inner cavity is also provided on the side wall of the cylinder body 1, and a pressure relief valve can be connected through the pressure relief valve interface 12 to safely relieve pressure when the oil-free compressor stops and unloads.

[0022] In this article, specific examples are used to elaborate on the principle and implementation mode of the present utility model. The description of the above embodiments is only used to help understand the technical solution and its core idea of the present utility model; those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present utility model.

Claims

1. An air flow noise reduction system for an oil-free compressor, characterized in that: It includes a cylinder body, on the inner wall of which is coated with sound-absorbing material. One end of the cylinder body is provided with a detachable end cover, and the other end of the cylinder body is provided with an air outlet communicating with its inner cavity. An intake silencing pipe is detachably installed on the side wall of the cylinder body. One end of the intake silencing pipe extends out of the cylinder body to form an air inlet, and the other end of the intake silencing pipe is inserted into the cylinder body and a plurality of sound-absorbing holes communicating with the inner cavity of the cylinder body are opened on the pipe wall.

2. The airflow noise reduction system for an oil-free compressor according to claim 1, characterized in that: The end cover is detachably connected to the cylinder body by bolts, and a sealing ring is arranged between the end cover and the cylinder body.

3. The airflow noise reduction system for an oil-free compressor according to claim 1, wherein: A connecting plate is fixedly arranged on the pipe wall of the intake silencing pipe, and the connecting plate is detachably connected to the cylinder body by bolts. A sealing gasket is arranged between the connecting plate and the cylinder body.

4. The airflow noise reduction system for an oil-free compressor according to claim 1, wherein: Both the air inlet and the air outlet are provided with connecting flanges.

5. The airflow noise reduction system for an oil-free compressor according to claim 1, characterized in that: A pressure relief valve interface communicating with the inner cavity of the cylinder body is arranged on the side wall of the cylinder body.

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