A noise reduction test device for centrifugal blower

Abstract

The present invention provides a noise reduction test device for a centrifugal blower, comprising a rectangular frame; the upper and lower ends of the frame are respectively covered with a top cover and a bottom plate, and the four side walls of the frame are covered with side plates; the inner surface of the top cover, the inner surface of the bottom plate and the inner surface of the side plate are all paved with sound absorption and insulation modules; a fan fixing seat is provided on the inner surface of the bottom plate, and a blower air outlet is provided on the top cover; a sound insulation cover air inlet is provided on the upper part of the side plate on the front surface of the frame, and a fixed cover is provided on the outer surface of the side plate on the front surface of the frame, and a movable cover is sleeved on the fixed cover. The noise reduction test device for a centrifugal blower of the present invention can simulate the noise reduction environment of a skid-mounted centrifugal blower, provide a test environment for the selection of materials and structural settings of the skid-mounted internal sound absorption and insulation modules, and the design of the silencer structure in the skid-mounted air intake channel, and has the characteristics of convenient use and good test effect.

Description

Technical Field

[0001] The invention belongs to the field of sound insulation and noise reduction, and in particular relates to a noise reduction test device for a centrifugal blower. Background Art

[0002] Centrifugal blowers are widely used in environmental protection, manufacturing and other fields. They transport air for production and generate huge noise when working. In order to reduce the noise of the blower during operation, the blower manufacturer will configure a sound insulation skid with good sealing for the blower. The internal wall adopts a sound-absorbing structure to isolate the noise of the blower through the closed structure of the skid. The noise spectrum characteristics of different blowers vary greatly, and the sound absorption characteristics of different sound-absorbing materials are also different, which often requires targeted configuration design. Selecting suitable sound-absorbing and sound-insulating materials and combinations on the side walls of the skid is an important part of the sound insulation skid design.

[0003] Centrifugal blowers must have air intake, so there must be an air intake channel on the skid. The air intake channel is the main part of noise leakage. A silencer structure must be set on the skid-mounted air intake channel, and sound-absorbing materials must be arranged inside the silencer structure to minimize the blower noise from spreading outward through the air inlet. The cross-sectional size of the air intake channel will directly affect the noise reduction effect, because an excessively large flow channel cross-sectional area will cause a large amount of noise in the skid to leak out, and although an excessively small cross-sectional area is conducive to eliminating noise radiation in the skid, it will increase the flow channel wind speed and generate higher aerodynamic noise. Therefore, blowers with different air volumes need to use different air intake areas; on the other hand, different blowers have different noise characteristics, which may be dominated by high-frequency components, low-frequency components, or wide-spectrum noise. Different types of sound-absorbing materials need to be configured for different noise characteristics to achieve the best noise reduction effect.

[0004] In the prior art, the selection of sound-absorbing materials and the determination of the cross-sectional size of the blower air inlet passage are usually based on calculations. However, noise is a very complex issue, and the best noise reduction effect cannot be achieved simply through calculations. A corresponding simulated noise reduction experimental device is needed to provide a basis for the noise reduction design of the blower skid and maximize the noise reduction capability of the skid. Summary of the invention

[0005] In view of this, the present invention aims to propose a noise reduction test device for a centrifugal blower, which can simulate the noise reduction environment of a skid-mounted centrifugal blower, provide a test environment for the selection of materials for the skid-mounted internal sound-absorbing and insulating module, structural settings, and the design of the silencer structure in the skid-mounted air intake channel, and has the characteristics of easy use and good test effect.

[0006] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0007] A noise reduction test device for a centrifugal blower comprises a rectangular frame; the upper and lower ends of the frame are respectively covered with a top cover and a bottom plate, and the four side walls of the frame are covered with side plates; the inner surfaces of the top cover, the bottom plate and the side plates are all paved with sound absorption and insulation modules; a fan fixing seat is provided on the inner surface of the bottom plate, and a blower air outlet is provided on the top cover; a sound insulation cover air inlet is provided on the upper part of the side plate on the front surface of the frame, a fixed cover is provided on the outer surface of the side plate on the front surface of the frame, a movable cover is sleeved on the fixed cover, a movable cover air inlet is provided at the bottom of the movable cover, a fixed cover air inlet is provided at the top of the fixed cover, and the fixed cover air inlet is aligned with the sound insulation cover air inlet; sound absorption and insulation modules are provided on the surfaces opposite to the fixed cover; an air circulation channel is formed between the movable cover and the fixed cover.

[0008] Furthermore, a spacing adjustment bolt is provided between the movable cover and the fixed cover; the movable cover moves forward and backward along a direction perpendicular to the surface of the fixed cover.

[0009] Furthermore, the side panels are provided with side panel handles.

[0010] Furthermore, a forklift hole is provided on the bottom plate.

[0011] Furthermore, a wire inlet is provided at the bottom of the side plate on the front surface of the frame.

[0012] Furthermore, a movable cover fastening screw is provided between the movable cover and the fixed cover.

[0013] Furthermore, the inner surface of the top cover, the inner surface of the bottom plate and the inner surface of the side plate are all provided with perforated plates fixedly connected by screws, and the sound absorption and insulation module is arranged on the perforated plates.

[0014] Compared with the prior art, the noise reduction test device for a centrifugal blower of the present invention has the following advantages: it can simulate the noise reduction environment of a skid-mounted centrifugal blower, provide a test environment for the selection of materials for the skid-mounted internal sound-absorbing and insulating module, structural settings, and the design of the silencer structure in the skid-mounted air intake passage, and has the characteristics of easy use and good test effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0016] In the attached picture:

[0017] Figure 1 This is a first structural schematic diagram of a noise reduction test device for a centrifugal blower according to an embodiment of the present invention;

[0018] Figure 2 This is a second structural schematic diagram of a noise reduction test device for a centrifugal blower according to an embodiment of the present invention;

[0019] Figure 3 A cross-sectional schematic diagram of a noise reduction test device for a centrifugal blower according to an embodiment of the present invention;

[0020] Figure 4 It is a schematic front view of a noise reduction test device for a centrifugal blower according to an embodiment of the present invention;

[0021] Figure 5 A schematic diagram of an air inlet of a soundproof cover of a noise reduction test device for a centrifugal blower according to an embodiment of the present invention.

[0022] Description of reference numerals:

[0023] 1- movable cover; 2- fixed cover; 3- top cover; 31- bottom plate; 4- frame; 5- side panel; 6- side panel handle; 7- forklift hole; 8- spacing adjustment bolt; 9- blower air outlet; 10- fan fixing seat; 14- sound absorption and insulation module; 15- movable cover air inlet; 16- sound insulation cover air inlet; 17- movable cover fastening screw; 18- fixed cover air inlet; 19- line inlet. DETAILED DESCRIPTION

[0024] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0027] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0028] like Figure 1-5 As shown, a noise reduction test device for a centrifugal blower comprises a rectangular frame 4; the upper and lower ends of the frame 4 are respectively covered with a top cover 3 and a bottom plate 31, and the four side walls of the frame 4 are covered with side plates 5; the inner surfaces of the top cover 3, the inner surfaces of the bottom plate 31 and the inner surfaces of the side plates 5 are all paved with sound absorption and insulation modules 14; a fan fixing seat 10 is provided on the inner surface of the bottom plate 31, and a blower air outlet 9 is provided on the top cover 3; a sound insulation cover air inlet 16 is provided on the upper part of the side plate 5 on the front surface of the frame 4, a fixed cover 2 is provided on the outer surface of the side plate 5 on the front surface of the frame 4, a movable cover 1 is sleeved on the fixed cover 2, a movable cover air inlet 15 is provided at the bottom of the movable cover 1, a fixed cover air inlet 18 is provided at the top of the fixed cover 2, and the fixed cover air inlet 18 is aligned with the sound insulation cover air inlet 16; sound absorption and insulation modules 14 are provided on the surfaces opposite to the fixed cover 2; an air circulation channel is formed between the movable cover 1 and the fixed cover 2.

[0029] In this embodiment, the centrifugal blower is installed on the blower fixing base 10, the centrifugal blower outlet pipe is connected to the blower outlet 9, and the external air enters into the skid through the movable cover air inlet 15, the fixed cover air inlet 18 and the sound insulation cover air inlet 16.

[0030] like Figure 1-5 As shown, a distance adjustment bolt 8 is provided between the movable cover 1 and the fixed cover 2; the movable cover 1 moves forward and backward along a direction perpendicular to the surface of the fixed cover 2.

[0031] In this embodiment, the spacing adjustment bolt 8 passes through the threaded hole set on the movable cover 1, and the top end is against the fixed cover 2. Since the movable cover 1 is sleeved on the fixed cover 2, by rotating the spacing adjustment bolt 8, the vertical distance between the movable cover 1 and the fixed cover 2 can be adjusted, that is, the cross-sectional area of ​​the skid-mounted air intake passage can be adjusted.

[0032] like Figure 1-5 As shown, a side panel handle 6 is provided on the side panel 5 .

[0033] like Figure 1-5 As shown, a forklift hole 7 is provided on the bottom plate 31 .

[0034] like Figure 1-5 As shown, a wire inlet 19 is provided at the bottom of the side plate 5 on the front surface of the frame 4 .

[0035] like Figure 1-5 As shown, a movable cover fastening screw 17 is provided between the movable cover 1 and the fixed cover 2 .

[0036] The movable cover fastening screws 17 play a role of auxiliary fixing. When it is necessary to adjust the vertical distance between the movable cover 1 and the fixed cover 2, the movable cover fastening screws 17 are loosened first.

[0037] like Figure 1-5 As shown, the inner surface of the top cover 3, the inner surface of the bottom plate 31 and the inner surface of the side plate 5 are all provided with perforated plates fixedly connected by screws, and the sound absorption and insulation module 14 is arranged on the perforated plates.

[0038] When it is necessary to replace the sound-absorbing and insulating module 14 with a different material to conduct a noise reduction effect test, the entire stamping plate with the sound-absorbing and insulating module 14 can be quickly replaced to improve the test efficiency.

[0039] In this embodiment, the operator can install sound-absorbing and insulating modules 14 of different materials on the relative surfaces of the skid-mounted inner, movable cover 1 and the fixed cover 2 according to design requirements, and can change the vertical distance between the movable cover 1 and the fixed cover 2 to realize different noise reduction material selection and structural design experiments.

[0040] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A noise reduction test device for a centrifugal blower, characterized in that: The invention comprises a rectangular frame (4); the upper and lower ends of the frame (4) are respectively covered with a top cover (3) and a bottom plate (31); the four side walls of the frame (4) are covered with side plates (5); the inner surface of the top cover (3), the inner surface of the bottom plate (31) and the inner surface of the side plate (5) are all paved with sound absorption and insulation modules (14); a fan fixing seat (10) is provided on the inner surface of the bottom plate (31); a blower outlet (9) is provided on the top cover (3); a soundproof cover air inlet (16) is provided on the upper part of the side plate (5) on the front surface of the frame (4); (4) A fixed cover (2) is provided on the outer surface of the side plate (5) of the front surface, a movable cover (1) is sleeved on the fixed cover (2), a movable cover air inlet (15) is provided at the bottom of the movable cover (1), a fixed cover air inlet (18) is provided at the top of the fixed cover (2), and the fixed cover air inlet (18) is aligned with the soundproof cover air inlet (16); sound absorbing and insulating modules (14) are provided on the surfaces opposite to the movable cover (1) and the fixed cover (2); an air circulation channel is formed between the movable cover (1) and the fixed cover (2); A spacing adjustment bolt (8) is provided between the movable cover (1) and the fixed cover (2); the movable cover (1) moves forward and backward in a direction perpendicular to the surface of the fixed cover (2); The bottom plate (31) is provided with a forklift hole (7); A wire inlet (19) is provided at the bottom of the side plate (5) on the front surface of the frame (4); A movable cover fastening screw (17) is provided between the movable cover (1) and the fixed cover (2); The inner surface of the top cover (3), the inner surface of the bottom plate (31) and the inner surface of the side plate (5) are all provided with perforated plates fixedly connected by screws, and the sound absorption and insulation module (14) is arranged on the perforated plates.

2. A noise reduction test device for a centrifugal blower according to claim 1, characterized in that: The side panel (5) is provided with a side panel handle (6).

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