A-type centrifugal fan with outlet plug-in type silencer

Abstract

The utility model relates to the field of fans, in particular to an A-type centrifugal fan with an outlet plug-in type silencer. The A-type centrifugal fan with the outlet insertion type silencer comprises a fan body, the fan body comprises an outlet, the outlet insertion type silencer is installed at the outlet in an embedded mode, a pipeline is arranged on the other side of the outlet insertion type silencer, the outlet insertion type silencer comprises an outer shell, an inner shell and a guide vane, and the guide vane is arranged in the outer shell. And the guide vane is arranged in the inner shell. According to the A type centrifugal fan outlet with the outlet plug-in type silencer, the plug-in type silencer is made of all-metal corrosion-resistant materials, the use environment conditions such as high temperature resistance, salt mist resistance and mould resistance of ships and nuclear facilities can be met, the outlet plug-in type silencer is designed in a built-in mode, and the service life of the outlet plug-in type silencer is prolonged. The utilization rate of the pipeline installation space of ships and nuclear facilities can be increased, and the noise of a fan outlet can be reduced by 4-8 dB (A).

Description

TECHNICAL FIELD

[0001] The utility model relates to a fan field, concretely relates to a kind of A formula centrifugal fan with outlet plug-in muffler. BACKGROUND

[0002] Conventional A formula centrifugal fan is composed of casing, impeller, motor, air inlet, motor mounting plate and other components.Its noise reduction means mainly relies on external pipeline muffler.And existing muffler is mostly conventional perforated plate plus glass wool or rock wool and other sound-absorbing materials, realizes noise reduction by pneumatic optimization.It has the following defects:

[0003] (1) poor space adaptability: ship / nuclear facility pipeline system space is limited, cannot install conventional muffler.

[0004] (2) insufficient environmental tolerance: traditional glass wool and other materials have problems such as poor waterproofness (water absorption rate>30%), low fireproof grade (UL94 HB grade), salt spray corrosion (500h test blistering) and the like.

[0005] (3) weak low-frequency sound attenuation capability: insufficient noise reduction amount (NR<10dB) in 125-500Hz frequency band. SUMMARY

[0006] The utility model hopes to provide a kind of A formula centrifugal fan with outlet plug-in muffler, and specific scheme is as follows:

[0007] A kind of A formula centrifugal fan with outlet plug-in muffler, including fan body, the fan body includes outlet, outlet plug-in muffler is embeddedly installed in the outlet, pipeline is arranged on the other side of outlet plug-in muffler, outlet plug-in muffler includes shell, inner shell and guide vane, the guide vane is arranged in inner shell.

[0008] The inner shell is ultra-micro perforated aluminum plate inner shell, the guide vane is ultra-micro perforated aluminum plate guide vane, and the shell is metal shell.

[0009] The fan body includes casing, motor mounting plate and air inlet are arranged on the casing, motor is arranged on the motor mounting plate, impeller is arranged in the casing, and the impeller and motor are cooperatively arranged.

[0010] The inner side of the casing is closely attached to the shell of outlet plug-in muffler.

[0011] The outlet plug-in muffler includes muffler flange, pipeline flange is arranged at one end of the pipeline, outlet flange is arranged on the outlet, and the muffler flange, pipeline flange and outlet flange are fixed by bolts.

[0012] The utility model discloses an A type centrifugal fan outlet with outlet plug-in muffler, the outlet plug-in muffler material adopts full metal corrosion -resistant material, can satisfy the high temperature resistance, salt fog and mould resistance of warship, nuclear facility and other use environment condition, the outlet plug-in muffler adopts built -in design, can improve the utilization of warship, nuclear facility pipeline installation space, can reduce fan outlet noise 4~8dB (A) again, simultaneously uses detachable design, and the customer is convenient to maintain and maintain, satisfies the requirement of repairability. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is the structural diagram of prior art;

[0014] Figure 2 It is the structural diagram of the utility model discloses an A type centrifugal fan outlet with outlet plug-in muffler;

[0015] Figure 3 It is the structural diagram of the utility model discloses an A type centrifugal fan outlet with outlet plug-in muffler in the outlet plug-in muffler;

[0016] Figure 4 It is the surface drawing of microperforated aluminum plate (inner shell and guide vane);

[0017] Figure 5 It is the section enlarged surface of microperforated aluminum plate (inner shell and guide vane);

[0018] Figure 6 It is the sound absorption coefficient of microperforated aluminum plate with the change of air layer thickness behind.

[0019] Wherein the sign: 1. fan body;11. outlet;12. machine shell;13. motor mounting plate;14. air inlet;15. motor;16. impeller;2. outlet plug-in muffler;21. outer shell;22. inner shell;23. guide vane;3. pipeline;4. bolt;51. muffler flange;52. pipeline flange;53. outlet flange. DETAILED DESCRIPTION

[0020] The utility model discloses an A type centrifugal fan outlet with outlet plug-in muffler, the outlet plug-in muffler material adopts full metal corrosion -resistant material, can satisfy the high temperature resistance, salt fog and mould resistance of warship, nuclear facility and other use environment condition, the outlet plug-in muffler adopts built -in design, can improve the utilization of warship, nuclear facility pipeline installation space, can reduce fan outlet noise 4~8dB (A) again, simultaneously uses detachable design, and the customer is convenient to maintain and maintain, satisfies the requirement of repairability. Figure 2 are described below:

[0021] A type centrifugal fan with outlet plug-in muffler, comprising a fan body 1, the fan body 1 comprising an outlet 11, the outlet 11 embeddedly installed with an outlet plug-in muffler 2, the outlet plug-in muffler 2 provided with a pipeline 3 on the other side, the outlet plug-in muffler 2 comprising an outer shell 21, an inner shell 22 and a guide vane 23, the guide vane 23 provided in the inner shell 22. The fan body 1 comprises a casing 12, the casing 12 provided with a motor mounting plate 13 and an air inlet 14, the motor mounting plate 13 provided with a motor 15, the casing 12 provided with an impeller 16, the impeller 16 and the motor 15 cooperatively arranged. The inner side of the casing 12 is tightly attached to the outer shell 12 of the outlet plug-in muffler 2. The outlet plug-in muffler 2 comprises a muffler flange 51, the pipeline 3 provided with a pipeline flange 52 at one end, the outlet 11 provided with an outlet flange 53, the muffler flange 51, the pipeline flange 52 and the outlet flange 53 fixed by bolts 4.

[0022] The application will be further described below in combination with Figures 3-6 :

[0023] The outer shell 21 of the outlet plug-in muffler 2 is formed by welding 5052 aluminum alloy (wall thickness δ = 2 mm) and the surface is treated by anodic oxidation; the inner shell 22 is formed by bending and riveting super-micro-perforated aluminum plate (plate thickness t = 0.8 mm) and the hole density is 3000-5000 holes / m²; the guide vane 23 is formed by bending and riveting super-micro-perforated aluminum plate (plate thickness t = 0.8 mm) and the hole density is 3000-5000 holes / m².

[0024] Product characteristics of super-micro-perforated aluminum plate:

[0025] a. The resistant resonance sound absorption structure is adopted, no porous sound absorption material is needed on the back, and the air layer and the resonance cavity are jointly formed, which is clean and pollution-free.

[0026] b. The special-shaped micro-perforated structure is adopted, the sound absorption coefficient is high (NCR 0.70-0.95), the sound absorption spectrum is wide, and the low-frequency performance is good.

[0027] c. The surface of the micro-perforated aluminum plate is treated by special baking paint, which is convenient for daily cleaning and maintenance, and has the advantages of light weight, waterproof, fireproof, salt resistance, high electromagnetic sound shielding and the like.

[0028] Sound absorption performance of super-micro-perforated aluminum plate:

[0029] The main feature of the super-micro-perforated sound absorption structure is the special-shaped hole with variable cross section, and the minimum hole diameter can reach 0.04 mm. The actual photos and cross-sectional enlarged views are as shown in Figure 4 , Figure 5 . The test proves that the super-micro-perforated sound absorption structure has better sound absorption performance than the general micro-perforated plate, and the change rule of the sound absorption coefficient with the thickness of the air layer on the back is as shown in Fig. 6.

[0030] The outlet insertion silencer 2 is inserted into the outlet 11 of the fan body 1. The sound enters the silencing chamber through the irregular micro-perforations. By utilizing the resistive resonance sound absorption structure, the outlet noise of the centrifugal fan is effectively reduced (the outlet noise of the fan is reduced by 4~8dB(A)).

[0031] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A type A centrifugal fan with an outlet insertion silencer, characterized in that: The device includes a fan body, which includes an outlet. An outlet insertion silencer is embedded in the outlet. A pipe is provided on the other side of the outlet insertion silencer. The outlet insertion silencer includes a shell, an inner shell, and guide vanes. The guide vanes are disposed inside the inner shell.

2. The A-type centrifugal fan with an outlet insertion silencer as described in claim 1, characterized in that: The inner shell is an ultra-micro-perforated aluminum plate inner shell, the guide vane is an ultra-micro-perforated aluminum plate guide vane, and the outer shell is a metal outer shell.

3. The A-type centrifugal fan with an outlet insertion silencer as described in claim 1, characterized in that: The fan body includes a casing, on which a motor mounting plate and an air inlet are provided. A motor is provided on the motor mounting plate, and an impeller is provided inside the casing. The impeller and the motor are configured to work together.

4. A type A centrifugal fan with an outlet insertion silencer as described in claim 3, characterized in that: The inner side of the housing is in close contact with the outer shell of the outlet insertion silencer.

5. A type A centrifugal fan with an outlet insertion silencer as described in claim 1, characterized in that: The outlet insertion silencer includes a silencer flange, one end of the pipe is provided with a pipe flange, and the outlet is provided with an outlet flange. The silencer flange, pipe flange and outlet flange are fixed by bolts.

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