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Anti-stall device of axial flow fan and control method of anti-stall device

An axial flow fan and fan technology, which is applied to the components of the pumping device for elastic fluid, pump control, mechanical equipment, etc., can solve the problems of reducing the aerodynamic efficiency of the blade, limiting the application range, stalling, etc.

Active Publication Date: 2016-11-23
CHINA ENERGY ENG GRP GUANGDONG ELECTRIC POWER DESIGN INST CO LTD
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Problems solved by technology

However, there is a stall zone in the axial flow fan, especially in the case of small flow, it is more prone to stall, and it also brings certain risks during operation, which limits its application range
[0003] The stall of the axial flow fan is its inherent hydrodynamic characteristics. Although changing the blade shape and installation angle can reduce the stall zone to a certain extent, these changes will reduce the aerodynamic efficiency of the blade at the rated flow rate. The side effect is that the fan Reduced operating efficiency

Method used

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  • Anti-stall device of axial flow fan and control method of anti-stall device
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[0029] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific embodiments described here are only used to explain the present invention, and do not limit the protection scope of the present invention.

[0030] Such as Figures 1 to 3 As shown, an anti-stall device for an axial fan according to the present invention includes: a fan cylinder 100, the fan cylinder 100 is provided with a recirculation zone 110, the recirculation zone 110 is arranged on the outer peripheral side of the leading vane 500, and the recirculation zone 110 A plurality of circulation passages 120 communicated with the inlet 102 of the leading guide vane 500 are provided, and the plurality of circulation passages 120 are arranged at intervals along the circumference of the recirc...

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Abstract

The invention relates to an anti-stall device of an axial flow fan and a control method of the anti-stall device. The anti-stall device of the axial flow fan comprises a fan barrel, a rotatable partition plate, a control mechanism and a pressure detection device. The fan barrel is provided with a backflow area arranged on the peripheral side of a front guide vane. Multiple circulation channels communicating with an inlet of the front guide vane are arranged on the backflow area and are arranged at intervals in the circumferential direction of the backflow area. The partition plate is arranged between the circulation channels and fan rotating vanes. The partition plate can rotate relative to the fan barrel and is provided with multiple blocking blades arranged at intervals in the circumferential direction of the partition plate. The control mechanism is used for controlling the partition plate to rotate. The pressure detection device is used for detecting the magnitude of the gas pressure between the circulation channels and the fan rotating vanes. The pressure detection device is electrically connected with the control mechanism. By means of the anti-stall device of the axial flow fan and the control method of the anti-stall device, stall of the axial flow fan can be effectively prevented, and meanwhile the operation efficiency of the fan is improved.

Description

technical field [0001] The invention relates to the technical field of axial flow fans, in particular to an anti-stall device of an axial flow fan and a control method thereof. Background technique [0002] Axial flow fans are widely used in large coal-fired units due to their technical advantages such as high efficiency and small rotor inertia. However, there is a stall zone in the axial flow fan, especially in the case of small flow rate, it is more prone to stall, and it also brings certain risks during operation, which limits its application range. [0003] The stall of the axial flow fan is its inherent hydrodynamic characteristics. Although changing the blade shape and installation angle can reduce the stall zone to a certain extent, these changes will reduce the aerodynamic efficiency of the blade at the rated flow rate. The side effect is that the fan Reduced operating efficiency. Contents of the invention [0004] Based on this, it is necessary to provide an ant...

Claims

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Application Information

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IPC IPC(8): F04D29/52F04D27/00
CPCF04D27/009F04D29/524
Inventor 霍沛强樊晓茹
Owner CHINA ENERGY ENG GRP GUANGDONG ELECTRIC POWER DESIGN INST CO LTD
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