Air inlet noise reduction structure of high-speed centrifugal blower

Abstract

The utility model provides an air inlet silencing structure of a high-speed centrifugal blower. The air inlet silencing structure comprises a side steel plate, a polyhedral tubular structure is formed by the side steel plates in a multi-face surrounding mode, a fixed shutter and a movable shutter are installed at openings in the two ends of the polyhedral tubular structure respectively, and a plurality of sound insulation plates extend inwards from the side wall in the polyhedral tubular structure and are installed in a staggered mode. Based on the structure that a plurality of sound insulation plates are installed in a staggered mode, high-speed airflow is subjected to multiple times of bending noise reduction, so that the overall noise reduction effect is greatly improved, the structure is simple, and structural redundancy is effectively avoided.

Description

Technical Field

[0001] This utility model relates to an air intake silencing structure for a high-speed centrifugal blower, belonging to the technical field of centrifugal blower accessories. Background Technology

[0002] High-speed centrifugal blowers generate aerodynamic noise during operation due to air compression. The main noise comes from the intake and exhaust jet noise caused by air compression, which is especially noticeable when the airflow suddenly diffuses at the volute. The intake and exhaust jet noise generally cannot be silenced by directly modifying the structure of the high-speed blower, so silencers need to be installed at the intake and exhaust ports.

[0003] Existing intake and exhaust mufflers generally consist of a simple external, relatively enclosed cavity. Examples include the integrated exhaust muffler cavity and refrigeration compressor disclosed in Chinese Patent Application No. CN201621192806.6, and a twin-screw blower exhaust muffler with a heat insulation layer disclosed in Chinese Patent Application No. CN201821413450.3. While this simple enclosed structure can reduce noise to some extent, it falls far short of the desired silencing effect, at most reducing noise levels above 100 decibels by 40 decibels. Therefore, to achieve better silencing in practice, the same muffler must be installed in multiple stages to achieve multi-stage noise reduction, resulting in an extremely large and redundant structure. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a high-speed centrifugal blower intake silencing structure. This high-speed centrifugal blower intake silencing structure is based on a structure of multiple sound insulation plates installed in an alternating manner, so that the high-speed airflow is subjected to multiple bending and silencing effects, thereby greatly improving the overall noise reduction effect. Moreover, the structure is simple and effectively avoids structural redundancy.

[0005] This utility model is achieved through the following technical solution.

[0006] This utility model provides a high-speed centrifugal blower intake noise reduction structure, including a side steel plate; the side steel plate is surrounded by multiple sides to form a multi-faceted tubular structure, and fixed louvers and movable louvers are respectively installed at the two ends of the multi-faceted tubular structure. Multiple sound insulation panels are installed inside the multi-faceted tubular structure, extending inward from the side wall and interlaced.

[0007] The sound insulation board is made of perforated mesh board filled with rock wool.

[0008] The sound insulation panel is installed at an angle and is supported and fixed by a support frame.

[0009] The sound insulation panel is installed at an angle from the end where the fixed louvers are located to the end where the movable louvers are located.

[0010] The sound insulation panel has an inclination angle of 5° to 20°.

[0011] The side steel plate is filled with external rock wool.

[0012] The side steel plates consist of four pieces, and the polyhedral tubular structure is a rectangular tubular structure.

[0013] The blades of the fixed louvers and the movable louvers are oriented in opposite directions.

[0014] The sound insulation panel is oriented perpendicular to the direction of the blades of the fixed louver.

[0015] The beneficial effects of this utility model are as follows: based on the structure of multiple sound insulation panels installed in an alternating manner, the high-speed airflow is subjected to multiple bending and sound absorption effects, thereby greatly improving the overall noise reduction effect. Moreover, the structure is simple and effectively avoids structural redundancy. Attached Figure Description

[0016] Figure 1 This is a structural schematic diagram of at least one embodiment of the present invention;

[0017] Figure 2 yes Figure 1 Sectional view of plane AA;

[0018] Figure 3 yes Figure 1 BB section view.

[0019] In the diagram: 11-Fixed louvers, 12-Modible louvers, 13-Side steel plate, 14-Outer rock wool, 21-Sound insulation board, 211-Perforated mesh plate, 212-Inner rock wool, 22-Support frame. Detailed Implementation

[0020] The technical solution of this utility model is further described below, but the scope of protection is not limited to what is described.

[0021] The first embodiment of this utility model relates to, for example... Figures 1 to 3 The high-speed centrifugal blower intake noise reduction structure shown includes a side steel plate 13; the side steel plate 13 is surrounded by multiple sides to form a multi-faceted tubular structure, and fixed louvers 11 and movable louvers 12 are respectively installed at the openings at both ends of the multi-faceted tubular structure. Multiple sound insulation panels 21 are installed inside the multi-faceted tubular structure, extending inward from the side wall and interlaced.

[0022] Therefore, the fixed louver 11 can adjust the air intake direction and prevent rainwater and debris from entering, the movable louver 12 can adjust the air intake speed by adjusting the air outlet speed, and the sound insulation panel 21 can greatly increase the airflow bending to achieve noise reduction.

[0023] The second embodiment of this utility model is largely the same as the first embodiment, except that the sound insulation board 21 is composed of a perforated mesh board 211 filled with rock wool 212.

[0024] Furthermore, the sound insulation panel 21 is installed at an angle and supported and fixed by the support frame 22.

[0025] Furthermore, the sound insulation panel 21 is installed at an angle from the end where the fixed louver 11 is located to the end where the movable louver 12 is located.

[0026] Preferably, the inclination angle of the sound insulation panel 21 is 5° to 20°.

[0027] Based on the tilt and angle settings of the sound insulation panel 21, the sound insulation panel 21 can effectively guide and bend the high-speed airflow to achieve a noise reduction effect. At the same time, it can also effectively block the airflow, allowing some airflow to pass through the sound insulation panel 21 in multiple stages to achieve noise reduction. Thus, the high-speed airflow is diverted to a certain extent (partially guided and bent, partially penetrated), which greatly improves the overall noise reduction effect.

[0028] The third embodiment of the present invention is largely the same as the first embodiment, except that the side steel plate 13 is filled with external rock wool 14.

[0029] Furthermore, the side steel plate 13 consists of four pieces, and the polyhedral tubular structure is a rectangular tubular structure.

[0030] Furthermore, the blades of the fixed louver 11 and the movable louver 12 are oriented in opposite directions.

[0031] Furthermore, the direction of the sound insulation panel 21 is perpendicular to the direction of the blades of the fixed louver 11.

[0032] This embodiment mainly optimizes specific details. It is easy to understand that a rigid shell structure is obviously not conducive to noise reduction. Therefore, the side steel plate 13 adopts a structure filled with rock wool. The four side steel plates 13 are set up to achieve a multi-level penetration noise reduction effect on the one hand, and avoid excessive airflow speed reduction due to too many layers, resulting in excessive internal cavity pressure on the other hand. The orientation of the sound insulation plate 21, the fixed louver 11 and the movable louver 12 is the optimal orientation obtained by the inventor through practical testing.

Claims

1. A high-speed centrifugal blower intake silencing structure, comprising a side steel plate (13), characterized in that: The side steel plate (13) is surrounded by multiple sides to form a multi-faceted tubular structure. Fixed louvers (11) and movable louvers (12) are installed at the two ends of the multi-faceted tubular structure. Multiple sound insulation panels (21) are installed inside the multi-faceted tubular structure, extending inward from the side wall and interlaced.

2. The high-speed centrifugal blower intake silencing structure as described in claim 1, characterized in that: The sound insulation board (21) is composed of a perforated mesh board (211) filled with inner rock wool (212).

3. The high-speed centrifugal blower intake silencing structure as described in claim 1, characterized in that: The sound insulation panel (21) is installed at an angle and supported and fixed by a support frame (22).

4. The high-speed centrifugal blower intake silencing structure as described in claim 3, characterized in that: The sound insulation panel (21) is installed at an angle from the end where the fixed louver (11) is located to the end where the movable louver (12) is located.

5. The high-speed centrifugal blower intake silencing structure as described in claim 3, characterized in that: The sound insulation board (21) has an inclination angle of 5° to 20°.

6. The high-speed centrifugal blower intake silencing structure as described in claim 1, characterized in that: The side steel plate (13) is filled with external rock wool (14).

7. The high-speed centrifugal blower intake silencing structure as described in claim 1, characterized in that: The side steel plate (13) consists of four pieces, and the polyhedral tubular structure is a rectangular tubular structure.

8. The high-speed centrifugal blower intake silencing structure as described in claim 1, characterized in that: The blades of the fixed louver (11) and the movable louver (12) are oriented in opposite directions.

9. The high-speed centrifugal blower intake silencing structure as described in claim 1, characterized in that: The direction of the sound insulation plate (21) is perpendicular to the direction of the blades of the fixed louver (11).

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