Low-noise air duct

Abstract

The utility model relates to the technical field of noise reduction of air cooling systems, and discloses a low-noise air duct which comprises an air duct body, fan blades and noise reduction units. The fan blade is rotatably arranged in the air duct, the rotating axis of the fan blade is collinear with the central axis of the air duct, a noise reduction unit is installed at the position, opposite to the blade tip of the fan blade, of the inner wall of the air duct, and a gap is formed between the noise reduction unit and the blade tip of the fan blade. The air cooling system is simple in overall structure, noise of the air cooling system is reduced by additionally arranging the noise reduction unit at the position, relative to the blade tip of the fan blade, of the air duct, and the noise problem of an existing air cooling system is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of noise reduction of air cooling systems, in particular to a low-noise air duct. Background Art

[0002] my country's economy has continued to develop at a high speed in recent years, and the country's requirements for environmental protection have become increasingly stringent. Due to the water-saving characteristics of air cooling systems, they are increasingly used in cooling systems. However, air cooling systems produce loud noise during operation, which often causes noise pollution.

[0003] The noise of the air cooling system is mainly generated by the rotation of the fan blades. To achieve a lower noise level, the previous practice was to reduce the fan speed. Once the fan speed is reduced, the designed air volume cannot be met. In order to achieve the designed air volume, the number of blades must be increased accordingly, which in turn increases equipment noise and increases the factory's electricity costs. Utility Model Content

[0004] The utility model aims to provide a low-noise air duct to solve the noise problem of the air cooling system mentioned in the above background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A low-noise air duct comprises an air duct, a fan blade and a noise reduction unit; the fan blade is rotatably arranged in the air duct, the rotation axis of the fan blade is colinear with the central axis of the air duct, the noise reduction unit is installed on the inner wall of the air duct relative to the tip of the fan blade, and there is a gap between the noise reduction unit and the tip of the fan blade.

[0007] The position of the wind tube facing the tip of the fan blade protrudes outward so that an annular fixing groove is formed at the position of the inner side of the wind tube facing the tip of the blade. The noise reduction unit is located in the fixing groove and is flush with the inner wall of the wind tube.

[0008] The noise reduction unit includes sound-absorbing cotton and a noise reduction grille; at least two noise reduction grilles are arranged opposite to each other, and the sound-absorbing cotton is filled between two adjacent noise reduction grilles.

[0009] It also includes a wind duct safety net, which is installed at the wind inlet end and / or the wind outlet end of the wind duct, and a noise reduction unit is arranged on the wind duct safety net.

[0010] The noise reduction unit is annular and is arranged at intervals on the wind tube safety net outwardly along the central axis of the wind tube.

[0011] The noise reduction unit comprises a silencer; the silencer comprises a shell, a sound absorbing board and sound absorbing cotton; the sound absorbing board is installed at two open ends of the shell, and the sound absorbing cotton is filled between two sound absorbing boards.

[0012] The sound absorbing plate on the side close to the fan blades is provided with a strip-shaped sound absorbing sheet, and the sound absorbing plate on the side away from the fan blades is provided with a honeycomb-shaped sound absorbing sheet.

[0013] The utility model has the following advantages over the prior art:

[0014] 1. The low-noise air duct of the utility model has a simple overall structure, and a noise reduction device is arranged at a position relative to the tip of the fan blade to reduce the noise of the air cooling system.

[0015] 2. The low-noise air duct of the utility model is modified by modifying the air duct wall so that the position of the air duct facing the tip of the fan blade protrudes outward, so that an annular fixing groove is formed on the inner side of the air duct facing the tip of the blade; the fixing groove is used to install the noise reduction unit. Through this arrangement, the noise reduction unit can be stably installed in the fixing groove, and the noise reduction unit is flush with the inner wall of the air duct to ensure that there is a certain distance between the noise reduction unit and the tip of the fan blade, which does not affect the normal rotation of the fan blade and can also reduce the noise of the air cooling system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a low-noise air duct in an embodiment of the utility model;

[0017] Figure 2 It is a structural schematic diagram of a wind tube safety net in a low-noise wind tube in an embodiment of the utility model;

[0018] Figure 3 It is a cross-sectional view of a muffler in a low-noise air duct in an embodiment of the utility model.

[0019] In the figure: 1. air duct; 2. fan blades; 3. noise reduction unit; 4. fixing slot; 5. air duct safety net; 6. silencer; 7. shell; 8. sound-absorbing board; 9. sound-absorbing cotton; 10. sound-absorbing sheet; 11. motor; 12. reducer. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] It should be noted that, in the description of the present invention, the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply 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.

[0022] In addition, it should be understood that for the convenience of description, the sizes of various components shown in the drawings are not drawn according to the actual proportional relationship.

[0023] It should be noted that like reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined or described in one drawing, it will not need to be further discussed and described in detail in the description of the subsequent drawings.

[0024] Example:

[0025] like Figures 1 to 3 As shown, the utility model provides a low-noise air duct, which is applied to an air cooling system, and includes an air duct 1, a fan blade 2 and a noise reduction unit 3; the fan blade 2 is driven to rotate by a motor 11, and a reducer 12 is connected to the output shaft of the motor 11 for adjusting the speed of the motor 11. The fan blade 2 is rotatably arranged in the air duct 1, and the rotation axis of the fan blade 2 is collinear with the central axis of the air duct 1. The noise reduction unit 3 is installed at the position of the inner wall of the air duct 1 relative to the tip of the fan blade 2, and there is a gap between the noise reduction unit 3 and the tip of the fan blade 2. Studies have shown that the main noise of the fan system is generated at the tip of the fan blade. Therefore, the utility model installs a noise reduction unit at a position directly opposite to the tip of the fan blade to absorb the noise generated by the fan system and achieve the purpose of noise reduction. Among them, the noise reduction unit can select an existing silencer, etc. The noise reduction unit 3 in this embodiment selects a combination of sound-absorbing cotton and a noise reduction grille. The noise reduction grille is made of metal material. Two or more noise reduction grilles are arranged opposite to each other. The adjacent two noise reduction grilles can be welded or bolted, and the sound-absorbing cotton is filled between the two adjacent noise reduction grilles to achieve better sound absorption effect.

[0026] like Figure 1As shown, in this embodiment, by modifying the structure of the wind tube, the position of the wind tube 1 facing the tip of the fan blade is designed to protrude outward, so that a circular fixing groove 4 is formed at the position of the inner side of the wind tube facing the tip, and the noise reduction unit is installed exactly in the fixing groove 4, and the noise reduction unit 3 is flush with the inner wall of the wind tube, ensuring that there is a gap between the noise reduction unit 3 and the tip of the fan blade, and the noise reduction unit does not protrude from the inner wall of the wind tube. The opening of the fixing groove is slightly larger than the width of the tip of the fan blade, so that the height of the sound absorption surface of the noise reduction unit facing the tip is slightly larger than the width of the tip of the blade, and the noise generated by the tip can be absorbed in a larger range. By modifying the structure of the wind tube 1, the position of the wind tube facing the tip of the fan blade is expanded outward, so that the size and installation of the noise reduction unit are not limited by the thickness of the wind tube, and the noise reduction unit can be installed more stably, without affecting the rotation of the fan blade, and can also absorb the main noise generated by the rotation of the fan blade, so as to achieve the effect of noise reduction. During actual construction, the depth of the fixing groove can also be designed according to the depth of the noise reduction unit to improve the sound absorption effect of the noise reduction unit.

[0027] like Figure 1 and Figure 2 As shown, the embodiment also includes a wind tube safety net 5, wherein the wind tube safety net 5 is installed at the wind tube air inlet end and / or the wind tube air outlet end (the wind tube safety net can be installed at the wind tube air inlet end or the wind tube air outlet end; or the wind tube air inlet end and the wind tube air outlet end are both installed with the wind tube safety net), and the wind tube safety net 5 can also be provided with a noise reduction unit 3. Among them, the noise reduction unit 3 installed on the wind tube installation net 5 is annular and is spaced outward along the central axis of the wind tube. The noise reduction unit 3 installed on the wind tube installation net 5 is a silencer 6; this silencer 6 includes a shell 7, a sound absorbing board 8 and a sound absorbing cotton 9; the sound absorbing board 8 is installed at the two open ends of the shell 7, and the sound absorbing cotton 9 is filled between the two sound absorbing boards 8.

[0028] like Figure 3 As shown, the silencer 6 installed on the wind tube safety net 5 has a strip-shaped sound-absorbing sheet 10 on the sound-absorbing board 8 close to the fan blade 2, and a honeycomb-shaped sound-absorbing sheet 10 on the sound-absorbing board 8 away from the fan blade 2. The sound-absorbing sheet can vibrate with the sound wave, convert the sound energy of the sound wave into heat energy and dissipate it. Through this setting, the noise of the fan system can be better weakened and absorbed, and the noise reduction effect can be improved. The sound-absorbing board 15 can be a perforated gypsum sound-absorbing board, in which the perforations are various in shape, and can be strip-shaped or honeycomb-shaped.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low-noise air duct, characterized in that: It includes a wind tube, fan blades and a noise reduction unit; the fan blades are rotatably arranged in the wind tube, the rotation axis of the fan blades is colinear with the central axis of the wind tube, the noise reduction unit is installed on the inner wall of the wind tube relative to the tip of the fan blade, and there is a gap between the noise reduction unit and the tip of the fan blade.

2. The low noise air duct according to claim 1, characterized in that: The position of the wind tube facing the tip of the fan blade protrudes outward so that an annular fixing groove is formed at the position of the inner side of the wind tube facing the tip of the blade. The noise reduction unit is located in the fixing groove and is flush with the inner wall of the wind tube.

3. The low noise air duct according to claim 1 or 2, characterized in that: The noise reduction unit includes sound-absorbing cotton and a noise reduction grille; at least two noise reduction grilles are arranged opposite to each other, and the sound-absorbing cotton is filled between two adjacent noise reduction grilles.

4. The low noise air duct according to claim 1, characterized in that: It also includes a wind duct safety net, which is installed at the wind inlet end and / or the wind outlet end of the wind duct, and a noise reduction unit is arranged on the wind duct safety net.

5. The low noise air duct according to claim 4, characterized in that: The noise reduction unit is annular and is arranged at intervals on the wind tube safety net outwardly along the central axis of the wind tube.

6. The low noise air duct according to claim 4, characterized in that: The noise reduction unit comprises a silencer; the silencer comprises a shell, a sound absorbing board and sound absorbing cotton; the sound absorbing board is installed at two open ends of the shell, and the sound absorbing cotton is filled between two sound absorbing boards.

7. The low noise air duct according to claim 6, characterized in that: The sound absorbing plate on the side close to the fan blades is provided with a strip-shaped sound absorbing sheet, and the sound absorbing plate on the side away from the fan blades is provided with a honeycomb-shaped sound absorbing sheet.

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