Noise reduction device for high-speed centrifugal fan experiment

Abstract

The utility model relates to the technical field of noise reduction devices, and provides a noise reduction device for a high-speed centrifugal fan experiment, which comprises a shell, two sides of the shell are fixedly connected with shutters, the interior of each shutter is connected with a sound insulation plate, the sound insulation plate is composed of three parts, and the outer layer of the sound insulation plate is provided with three layers of punching net plates which are arranged in a staggered mode. The two sides of the punching screen plate are welded to form a support, and sound insulation cotton is arranged in the inner side of the punching screen plate. The sound insulation plate is fixedly connected with the shell; a plurality of groups of sound insulation plates are distributed in an array, the shutters are of a plurality of groups of rotatable blade structures, and the two groups of shutters are symmetrically distributed; and an adjusting structure is connected between the sound insulation plate and the shell. By means of the technical scheme, the problems that an existing high-speed air blower test room is often accompanied by large noise, a large amount of air is needed for fan testing, a window is required to be subjected to professional air inlet transformation, and the influence of the noise on the surroundings is reduced under the condition that air inlet is not affected are solved, and the better noise reduction effect is achieved.

Description

Technical Field

[0001] This utility model relates to the field of noise reduction device technology, specifically to a noise reduction device for high-speed centrifugal fan experiments. Background Technology

[0002] High-speed centrifugal fans rotate at high speeds during experiments, which generates a lot of noise. Therefore, a device is needed to reduce the noise generated by the fan, thereby reducing the harm to the experimenters.

[0003] A search revealed a noise-reducing air intake device for a high-pressure centrifugal fan, authorized by publication number CN214424775U. This device includes a housing with an air inlet and an air outlet. The housing contains a first chamber and a second chamber, separated by an isolation section. A first channel connecting the first and second chambers is provided in the isolation section. The air inlet is located on the side wall of the first chamber, and the air outlet is located on the side wall of the second chamber. An air inlet duct passes sequentially through the air inlet, the first chamber, and the isolation section, guiding external airflow to the second chamber. An air outlet duct passes sequentially through the air outlet, the second chamber, and the isolation section, guiding airflow from the first chamber to the outside. This air intake device reduces wind noise by altering the direction and speed of the airflow entering the fan without reducing the air volume.

[0004] However, the existing high-speed blower test chambers often produce a lot of noise. Since blower testing requires a large amount of air intake, the windows need to be professionally modified to reduce the noise impact on the surroundings without affecting the air intake. To this end, we propose a noise reduction device for high-speed centrifugal blower testing. Utility Model Content

[0005] This invention proposes a noise reduction device for high-speed centrifugal fan experiments, which solves the problem mentioned in the background art that existing high-speed blower test chambers are often accompanied by large noise levels, and that because blower testing requires a large amount of air intake, windows need to be professionally modified for air intake, thus reducing the noise impact on the surrounding environment without affecting air intake.

[0006] The technical solution of this utility model is as follows:

[0007] A noise reduction device for high-speed centrifugal fan experiments includes a housing, with louvers fixedly connected to both sides of the housing. A sound insulation board is connected inside the louvers. The sound insulation board consists of three parts: the outer layer of the sound insulation board is three layers of perforated mesh plates placed in an alternating manner; the two sides of the perforated mesh plates are welded to form a support; and sound insulation cotton is built into the inner side of the perforated mesh plates.

[0008] As a further technical solution of this utility model, the sound insulation board is fixedly connected to the outer shell.

[0009] As a further technical solution of this utility model, the number of sound insulation panels is several groups and they are arranged in an array, the number of louvers is several groups of rotatable blade structures, and the number of louvers is two groups and they are symmetrically distributed.

[0010] As a further technical solution of this utility model, an adjustment structure is connected between the sound insulation board and the outer shell. The adjustment structure includes a protruding shaft fixedly connected to the outer surface of the sound insulation board. A recessed groove is opened on the inner wall surface of the rear side of the outer shell. A drive wheel, a guide wheel and a driven wheel are rotatably connected to the inner side of the outer shell corresponding to the inner side of the recessed groove. A transmission belt is wound between the driven wheel, the guide wheel and the adjustment structure. A servo motor is fixedly connected to the inner surface of the outer shell corresponding to the drive wheel.

[0011] As a further technical solution of this utility model, the output shaft of the servo motor is fixedly connected to the drive wheel, and the output shaft passes through the housing of the outer shell, driving the drive wheel to rotate through the servo motor.

[0012] As a further technical solution of this utility model, the number of protruding shafts corresponding to one set of the sound insulation plate is two sets, one end of the protruding shaft is embedded in the inner wall surface of the outer shell, and the protruding shaft and the outer shell are rotatably connected.

[0013] As a further technical solution of this utility model, the protruding shaft is disposed at the corresponding middle part of the surface of the sound insulation plate, and the guide wheel is used to limit and guide the position of the transmission belt and maintain the contact surface size between the transmission belt and the driving wheel and the driven wheel.

[0014] As a further technical solution of this utility model, the number and position of the driven wheels correspond one-to-one with the number and position of the sound insulation plates, and the thickness of the driving wheel, guide wheel, driven wheel and transmission belt are all less than the thickness of the groove.

[0015] The working principle and beneficial effects of this utility model are as follows:

[0016] This invention utilizes sound insulation panels, perforated mesh panels, and louvers to achieve noise reduction through the contact area between gas and sound-absorbing cotton. The arrangement of several obliquely oriented sound insulation panels allows airflow blown in through the louver gaps to be bounced and absorbed by the panels. Simultaneously, the airflow passes through the sound-absorbing cotton and is ultimately discharged outwards through the gaps in the louvers on the other side, significantly reducing noise generation. Furthermore, the entire device has a simple structure, high reproducibility, low cost, good noise reduction effect, and low process requirements. The tilt angle of the louvers can be adjusted as needed to control the air intake angle, achieving even better noise reduction. Attached Figure Description

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0018] Figure 1 This is a schematic diagram of the device structure of this utility model;

[0019] Figure 2 This utility model Figure 1 A schematic diagram of the cut-out section of the structure;

[0020] Figure 3 A partial structural diagram of the device of this utility model equipped with an adjustment structure;

[0021] Figure 4 This utility model Figure 3 A schematic diagram of the cut-out section of the structure;

[0022] Figure 5 This utility model Figure 1 A schematic diagram of a section of the structure cut open from another perspective.

[0023] In the diagram: 1. Outer shell; 2. Louver; 3. Sound insulation panel; 4. Perforated mesh panel; 5. Adjustment structure; 51. Protruding shaft; 52. Recessed groove; 53. Drive wheel; 54. Guide wheel; 55. Driven wheel; 56. Transmission belt; 57. Servo motor. Detailed Implementation

[0024] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this utility model. Example 1

[0025] like Figures 1-2 As shown in the figure, this embodiment proposes a noise reduction device for high-speed centrifugal fan experiments, including a shell 1, with louvers 2 fixedly connected to both sides of the shell 1, and a sound insulation board 3 connected inside the louvers 2. The sound insulation board 3 is composed of three parts: the outer layer of the sound insulation board 3 is three layers of perforated mesh 4 placed in an alternating manner, the two sides of the perforated mesh 4 are welded to form a support, and the inner side of the perforated mesh 4 is filled with sound insulation cotton.

[0026] The sound insulation panel 3 is fixedly connected to the outer shell 1.

[0027] The number of sound insulation panels 3 is several groups and they are arranged in an array. The number of louvers 2 is several groups of rotatable blade structures. The number of louvers 2 is two groups and they are symmetrically distributed.

[0028] In this embodiment, noise reduction can be achieved by the contact area between gas and sound-absorbing cotton. Through the arrangement of several inclined sound-absorbing panels 3, the airflow blown in from the gaps of the louvers 2 is bounced and absorbed by the sound-absorbing panels 3. At the same time, the airflow passes through the sound-absorbing cotton and can finally be discharged outward from the gaps of the louvers 2 on the other side, thereby greatly reducing the generation of noise. The entire device has a simple structure, high reproducibility, low cost, good noise reduction effect, and low process requirements. At the same time, the tilt angle of the louvers 2 can be adjusted as needed to control the angle of air intake and achieve better noise reduction effect. Example 2

[0029] like Figures 3-5 As shown, based on Embodiment 1, an adjustment structure 5 is connected between the sound insulation panel 3 and the outer shell 1. The adjustment structure 5 includes a protruding shaft 51 fixedly connected to the outer surface of the sound insulation panel 3. A recessed groove 52 is provided on the inner wall surface of the rear side of the outer shell 1. A drive wheel 53, a guide wheel 54, and a driven wheel 55 are rotatably connected to the inner side of the outer shell 1 corresponding to the inner side of the recessed groove 52. A transmission belt 56 is wound between the driven wheel 55, the guide wheel 54, and the adjustment structure 5. A servo motor 57 is fixedly connected to the inner surface of the outer shell 1 corresponding to the drive wheel 53.

[0030] The output shaft of the servo motor 57 is fixedly connected to the drive wheel 53, and the output shaft passes through the housing of the outer shell 1. The drive wheel 53 is driven to rotate by the servo motor 57. There are two sets of protruding shafts 51 corresponding to a set of sound insulation plates 3. One end of the protruding shaft 51 is embedded in the inner wall surface of the outer shell 1, and the protruding shaft 51 and the outer shell 1 are rotatably connected.

[0031] The protruding shaft 51 is located at the corresponding center of the surface of the sound insulation plate 3. The guide wheel 54 is used to limit and guide the position of the transmission belt 56 and maintain the contact surface size between the transmission belt 56 and the driving wheel 53 and the driven wheel 55. The number and position of the driven wheels 55 correspond one-to-one with the number and position of the sound insulation plates 3. The thickness of the driving wheel 53, the guide wheel 54, the driven wheel 55 and the transmission belt 56 are all less than the thickness of the groove 52.

[0032] In this embodiment, during use, the angle of the sound insulation board 3 can be adjusted according to the actual needs of use. Different angles have different noise reduction effects, which can be used to study which angle has the best noise reduction effect, thereby minimizing the generation of imaging during use and bringing better noise reduction effect.

[0033] In summary, the working principle of this utility model is as follows:

[0034] During use, wind blows into the interior of the outer shell 1 from one side of the louver 2. At this time, the airflow bounces back and forth between the sound insulation panel 3 and the shell of the outer shell 1. Some of the airflow passes through the mesh and sound insulation cotton and finally blows out from the other side of the louver 2, thereby achieving the effect of noise reduction.

[0035] During the above-mentioned use, the user can start the servo motor 57 as needed. The servo motor 57 drives the drive wheel 53 to rotate clockwise. The clockwise rotation of the drive wheel 53 drives the transmission belt 56 to rotate clockwise as well. The transmission belt 56 drives the driven wheel 55 to rotate clockwise as well. During the entire transmission process of the transmission belt 56, the guide wheel 54 maintains its stability and ensures the stability of the transmission belt 56 driving the driven wheel 55 to rotate. The synchronously rotating driven wheel 55 drives the protruding shaft 51 to rotate. The protruding shaft 51 drives the sound insulation plate 3 to rotate as well, thereby adjusting the tilt angle of the sound insulation plate 3. Since different wind speeds require different levels of noise reduction, it can be adjusted according to the user's needs and facilitates the study of noise reduction effects in experimental research.

[0036] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A noise reduction device for high-speed centrifugal fan experiments, comprising a shell (1), characterized in that, The both sides of the shell (1) are fixedly connected with louvers (2), the inside of the louver (2) is connected with soundproof boards (3), the soundproof board (3) is composed of three parts, the outer layer of the soundproof board (3) is three staggered punched screen plates (4), the both sides of the punched screen plate (4) are welded to form supports, the inside of the punched screen plate (4) is provided with soundproof cotton.

2. The noise reduction device for high-speed centrifugal fan experiment of claim 1, wherein, The soundproof board (3) and the shell (1) are fixedly connected.

3. The noise reduction device for high-speed centrifugal fan experiment of claim 1, wherein, The soundproof board (3) is in array distribution, the louver (2) is a rotatable blade structure, and the number of the louver (2) is two groups and is symmetrically distributed.

4. The noise reduction device for high-speed centrifugal fan experiment of any one of claims 1 or 3, characterized in that, The soundproof board (3) and the shell (1) are connected with an adjusting structure (5), the adjusting structure (5) includes a protruding shaft (51) fixedly connected to the outer surface of the soundproof board (3), the rear inner wall surface of the shell (1) is provided with a recessed groove (52), the inside of the recessed groove (52) is rotatably connected with a driving wheel (53), a guide wheel (54) and a driven wheel (55), the driven wheel (55), the guide wheel (54) and the adjusting structure (5) are provided with a transmission belt (56), and the inside surface of the shell (1) is fixedly connected with a servo motor (57) corresponding to the driving wheel (53).

5. The noise reduction device for high-speed centrifugal fan experiment of claim 4, wherein, The output shaft of the servo motor (57) is fixedly connected with the driving wheel (53), and the output shaft penetrates the shell (1), and the servo motor (57) drives the driving wheel (53) to rotate.

6. The noise reduction device for high-speed centrifugal fan experiment of claim 5, wherein, The number of the soundproof board (3) corresponding to the protruding shaft (51) is two groups, one end of the protruding shaft (51) is embedded in the inner wall surface of the shell (1), and the protruding shaft (51) and the shell (1) are rotatably connected.

7. The noise reduction device for high-speed centrifugal fan experiment of claim 6, wherein, The protruding shaft (51) is arranged on the surface of the soundproof board (3) corresponding to the middle part, the guide wheel (54) is used for limiting and guiding the position of the transmission belt (56), and the contact area of the transmission belt (56) and the driving wheel (53) and the driven wheel (55) is kept.

8. The noise reduction device for high-speed centrifugal fan experiment of claim 7, wherein, The number and position of the driven wheel (55) correspond to the number and position of the soundproof board (3), and the thickness of the driving wheel (53), the guide wheel (54), the driven wheel (55) and the transmission belt (56) is less than the groove thickness of the recessed groove (52).

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