Silenced high-speed centrifugal fan

A high-speed centrifugal and fan technology, used in mechanical equipment, machines/engines, liquid fuel engines, etc., can solve the problems of difficult processing, high assembly requirements, and low processing costs of centrifugal fans, and achieve improved flow field dynamics. The effect of reducing large-scale vortex and increasing fan pressure

Pending Publication Date: 2018-02-02
上海瑞晨环保科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the defects of prior art centrifugal fans such as high processing difficulty, low processing cost, high assembly requirements, poor overall streng

Method used

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  • Silenced high-speed centrifugal fan
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  • Silenced high-speed centrifugal fan

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] A noise-absorbing high-speed centrifugal fan, such as figure 2 As shown, it includes a casing 1, an air inlet 2, a blade 3, an impeller front cover 5, an impeller rear cover 6 and a motor 7.

[0059] The casing 1 is a hollow spiral asymmetric structure with an opening on the bottom surface. The rear side plate of the casing 1, that is, the unopened surface, is fixedly connected to the mounting plate of the motor 4 through bolts. The opening position corresponds to the conical arc-shaped air inlet 2, and the air inlet 2. It is connected with the front cover plate 5 of the annular impeller. The front cover plate 5 of the impeller completely covers the impeller composed of the blades 3. The diameter of the impeller is 250mm, and the blades 3 are arc-shaped. The distance between the two opposite surfaces of the cover plate 5 and the blade 3 is 1mm, and the surface opposite to the blade of the front cover plate of the impeller is provided with an annular protrusion 15 surro...

Embodiment 2

[0063] A noise-absorbing high-speed centrifugal fan, the structure of which is basically the same as that of Embodiment 1, the difference is that there is no ring-shaped protrusion surrounding the blade on the surface of the impeller front cover plate opposite to the blade, and the impeller front cover plate, air inlet and cylinder Welded with iron plate, the distance between the two opposite surfaces of the impeller front cover plate and the blade is 0.9mm, the blade is airfoil type, the thickness of the metal plate is 0.95mm, the perforation rate is 30%, and the aperture of the through hole is 6mm.

[0064] The speed of the noise-absorbing high-speed centrifugal fan is 7000rpm, and the efficiency is 75%. It has been verified that the noise-absorbing high-speed centrifugal fan of the present invention has low processing difficulty, low processing cost, high overall strength, can meet the requirements of high speed, reasonable design, and low assembly requirements; compared wit...

Embodiment 3

[0066] A noise-absorbing high-speed centrifugal fan, the structure of which is basically the same as that of Embodiment 2, the difference is that a sheet-shaped reinforcing ring is fixed on the surface opposite the blade and the front cover of the impeller, and the outer edge of the reinforcing ring intersects the outer edge of the blade. The outer edge refers to the edge farthest from the central axis of the motor output shaft. The width of the reinforcement ring is 5mm. The reinforcement ring, blades and impeller rear cover are integrally milled. The distance between them is 0.8mm, the thickness of the metal plate is 0.85mm, the perforation rate is 25%, and the diameter of the through hole is 7mm.

[0067] The speed of the noise-absorbing high-speed centrifugal fan is 7500rpm, and the efficiency is 72.5%. It has been verified that the noise-absorbing high-speed centrifugal fan of the present invention has low processing difficulty, low processing cost, high overall strength,...

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Abstract

The invention relates to a silenced high-speed centrifugal fan which comprises a shell, an air inlet, blades, an impeller front cover plate, an impeller rear cover plate and a motor. The impeller front cover plate is separated from the blades. The inner side edge of the impeller front cover plate is connected with the air inlet. The outer side edge of the impeller front cover plate is connected with a drum fixed to the air inlet. The impeller front cover plate, the air inlet and the drum form a hollow cylinder, wherein the inner wall of the hollow cylinder is a smooth curved surface, and the inner diameter of the hollow cylinder is gradually increased from the middle to the two ends. A cavity is formed between the inner wall and the outer wall of the hollow cylinder. Through holes are formed in the surface, making contact with airflow, of the hollow cylinder, the punching rate is 20-30%, the diameter of the through holes is greater than or equal to 4 mm, and the cavity is filled with silencing materials. According to the silenced high-speed centrifugal fan provided by the invention, the blades are separated from the impeller front cover plate, the machining difficulty is remarkablyreduced, the blades and the impeller rear cover plate are integrally formed, and the fan pressure is increased; and the through holes are formed in the surface, making contact with the airflow, of the hollow cylinder, a dissipative muffler is formed, the airflow resistance is low, the pressure loss is low, and the noise reduction effect is good.

Description

technical field [0001] The invention belongs to the field of general mechanical ventilation equipment and relates to a noise-absorbing high-speed centrifugal fan. Background technique [0002] The centrifugal fan uses the mechanical energy of the fan impeller rotation to convert the pressure energy and kinetic energy of the gas, and sends the gas out. The gas enters the air along the streamlined air inlet of the fan in the axial direction, and the air energy is generated by the rotation of the impeller, and the gas is transported along the spiral shell. to the output, and then sent out from the air outlet of the casing. In a centrifugal fan, the gas enters the impeller from the axial direction, the gas changes to the radial direction as it flows through the impeller, and then enters the diffuser. In a diffuser, the gas changes direction and the cross-sectional area of ​​the duct increases to decelerate the gas flow. This deceleration converts kinetic energy into pressure en...

Claims

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Application Information

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IPC IPC(8): F04D25/08F04D29/42F04D29/44F04D29/66
CPCF04D25/08F04D29/4226F04D29/441F04D29/663F04D29/664F04D29/667
Inventor 贾志彬陈招锋程原
Owner 上海瑞晨环保科技股份有限公司
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