Sound absorption and noise reduction type centrifugal fan volute

Abstract

The utility model relates to the technical field of centrifugal fans, and discloses a sound absorption and noise reduction type centrifugal fan volute which comprises a volute body, an air inlet is formed in the side wall of the top of the volute body, an arc-shaped extension section is arranged on one side of the volute body, and an air outlet is formed in the end of the arc-shaped extension section. A noise reduction cavity is formed in the inner side wall of the volute body, and the noise reduction cavity is filled with a sound absorption material layer. A sound-absorbing coating is sprayed on the inner side wall of the volute body; a plurality of linear grooves which are evenly distributed are formed in the position, close to the arc-shaped extending section, of the inner side wall of the volute body. The centrifugal fan volute adopts the structure of the sound absorbing material, the sound absorbing coating and the linear flow groove, has better air resistance and sound wave absorption characteristics, can effectively reduce the noise intensity, and improves the use effect of the centrifugal fan volute.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal fans, in particular to a sound-absorbing and noise-reducing volute of a centrifugal fan. Background Art

[0002] A centrifugal fan is mainly composed of a fan volute and a centrifugal impeller installed in the fan volute. The shape of the volute is very similar to a snail shell. An air inlet is provided on the axial side of the volute, and an air outlet is provided on the circumferential side. A volute cavity and an air duct connecting the volute cavity and the air outlet are constructed inside, and the centrifugal impeller is installed inside the volute cavity.

[0003] During operation, the high-speed air flow in existing centrifugal fans causes noise inside the volute, which pollutes the environment and significantly reduces the effectiveness of the centrifugal fan. Therefore, a sound-absorbing and noise-reducing centrifugal fan volute is proposed. Utility Model Content

[0004] The purpose of the utility model is to solve the problem of poor noise reduction effect of the centrifugal fan volute in the prior art, and to propose a sound-absorbing and noise-reducing centrifugal fan volute.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A sound-absorbing and noise-reducing centrifugal fan volute comprises a volute body, wherein the top side wall of the volute body is provided with an air inlet, one side of the volute body is provided with an arc-shaped extension section, and the end of the arc-shaped extension section is provided with an air outlet; the inner side wall of the volute body is provided with a noise reduction cavity, and the interior of the noise reduction cavity is filled with a layer of sound-absorbing material; the inner side wall of the volute body is sprayed with a sound-absorbing coating; the inner side wall of the volute body is provided with a plurality of evenly distributed linear grooves near the arc-shaped extension section.

[0007] Preferably, the size of the arc-shaped extension section of the volute casing to the air outlet is set to increase gradually.

[0008] Preferably, the sound-absorbing material layer is a polyurethane foam layer.

[0009] Preferably, the sound-absorbing coating is a rock wool fiber coating.

[0010] Preferably, the depth of the middle portion of the linear groove is greater than the depth of both ends, and the bottom of the linear groove adopts an arc-shaped structure.

[0011] Preferably, a sound absorbing panel retaining groove is provided at the opening of the air outlet.

[0012] Compared with the prior art, the present invention provides a sound-absorbing and noise-reducing centrifugal fan volute, which has the following beneficial effects:

[0013] 1. The sound-absorbing and noise-reducing centrifugal fan volute has a sound-absorbing material layer and a sound-absorbing coating arranged on the inner wall of the volute. The sound-absorbing material is polyurethane foam and the sound-absorbing coating is a rock wool fiber coating. The two materials have good air resistance and sound wave absorption characteristics. The combination of the two can effectively reduce noise intensity.

[0014] 2. The sound-absorbing and noise-reducing centrifugal fan volute has linear grooves arranged on the inner wall of the volute body. When the gas passes through the arc-shaped extension section of the volute body, the gas passes through the linear grooves, which can reduce the resistance to air flow and thus reduce the intensity of noise.

[0015] The parts not involved in this device are the same as the existing technology or can be implemented by using the existing technology. The utility model adopts the structure of sound-absorbing material, sound-absorbing coating and linear flow groove, has good air resistance and sound wave absorption characteristics, can effectively reduce noise intensity, and improve the use effect of the centrifugal fan volute. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural schematic diagram of a sound-absorbing and noise-reducing centrifugal fan volute proposed in the utility model;

[0017] Figure 2 for Figure 1 Schematic diagram of the cross-section structure of the volute casing;

[0018] Figure 3 for Figure 2 Schematic diagram of the structure of the mid-linear slot.

[0019] In the figure: 1. Volute; 2. Air inlet; 3. Air outlet; 4. Sound-absorbing material layer; 5. Sound-absorbing coating; 6. Linear groove; 7. Sound-absorbing panel positioning groove. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and 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. Therefore, they cannot be understood as limitations on the present invention.

[0022] Example 1

[0023] Reference Figure 1-2 A sound-absorbing and noise-reducing centrifugal fan volute comprises a volute body 1, an air inlet 2 is provided on the top side wall of the volute body 1, an arc-shaped extension section is provided on one side of the volute body 1, and an air outlet 3 is provided at the end of the arc-shaped extension section. The size between the arc-shaped extension section of the volute body 1 and the air outlet 3 is gradually increased, which can enable the gas to flow in an arc-shaped linear manner and reduce the resistance to air flow; a noise reduction cavity is provided on the inner side wall of the volute body 1, and a sound-absorbing material layer 4 is provided inside the noise reduction cavity. The sound-absorbing material layer 4 is a polyurethane foam layer, and the inner side wall of the volute body 1 is sprayed with a sound-absorbing Coating 5, the sound-absorbing coating 5 adopts rock wool fiber coating, polyurethane foam and rock wool fiber coating. The two materials have good air resistance and sound wave absorption characteristics. The combination of the two can effectively reduce the noise intensity; the inner wall of the volute casing 1 and the position close to the arc-shaped extension section are provided with a plurality of evenly distributed linear grooves 6. The middle depth of the linear groove 6 is greater than the depth at both ends, and the bottom of the linear groove 6 adopts an arc structure. When the gas passes through the arc-shaped extension section of the volute casing 1, the gas passes through the linear groove 6, which can reduce the resistance to air flow and thus reduce the intensity of noise generation.

[0024] Example 2

[0025] Reference Figure 2-3 A sound absorbing board slot 7 is provided at the opening of the air outlet 3. A sound absorbing board can be installed through the sound absorbing board slot 7 to reduce the noise level after the air flows out. The sound absorbing board can be used selectively.

[0026] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A sound-absorbing and noise-reducing centrifugal fan volute, comprising a volute casing (1), characterized in that: The top side wall of the volute casing (1) is provided with an air inlet (2), one side of the volute casing (1) is provided with an arc-shaped extension section, and the end of the arc-shaped extension section is provided with an air outlet (3); The inner side wall of the volute casing (1) is provided with a noise reduction cavity, and the interior of the noise reduction cavity is filled with a sound absorbing material layer (4); The inner side wall of the volute casing (1) is sprayed with a sound-absorbing coating (5); A plurality of evenly distributed linear grooves (6) are provided on the inner side wall of the volute casing (1) and near the arc-shaped extension section.

2. The sound-absorbing and noise-reducing centrifugal fan volute according to claim 1, characterized in that: The sizes between the arc-shaped extension section of the volute casing (1) and the air outlet (3) are arranged in a progressively increasing manner.

3. The sound-absorbing and noise-reducing centrifugal fan volute according to claim 1, characterized in that: The sound absorbing material layer (4) is a polyurethane foam layer.

4. The sound-absorbing and noise-reducing centrifugal fan volute according to claim 1, characterized in that: The sound-absorbing coating (5) is a rock wool fiber coating.

5. The sound-absorbing and noise-reducing centrifugal fan volute according to claim 1, characterized in that: The depth of the middle portion of the linear groove (6) is greater than the depth of the two ends, and the groove bottom of the linear groove (6) adopts an arc-shaped structure.

6. The sound-absorbing and noise-reducing centrifugal fan volute according to claim 1, characterized in that: A sound absorbing board positioning groove (7) is provided at the opening of the air outlet (3).

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