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Internal feedback axial-flow induced draft fan moving blade adjusting mechanism and working method thereof

An adjustment mechanism and axial flow technology, which is applied in the direction of machines/engines, mechanical equipment, non-variable pumps, etc., can solve problems such as high failure rate and harsh operating environment, improve reliability, reduce costs, and benefit The effect of marketing

Pending Publication Date: 2018-03-06
武汉思亘远电控设备有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the adjustment method mainly based on hydraulic adjustment will be the development direction of the induced draft fan control in the future. Device failure is one of the common failures of axial flow induced draft fans

Method used

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  • Internal feedback axial-flow induced draft fan moving blade adjusting mechanism and working method thereof
  • Internal feedback axial-flow induced draft fan moving blade adjusting mechanism and working method thereof

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Embodiment Construction

[0032] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0033] Such as figure 1 , 2 As shown, an internal feedback type axial flow induced draft motor blade adjustment mechanism includes: a control system, a servo valve, an impeller, a small cylinder 1, a central shaft 2, a hydraulic cylinder, a main shaft flange 7, a flow distribution shaft 8 and a displacement sensor.

[0034] The hydraulic cylinder is composed of a cylinder head 3, a cylinder barrel 5, and a cylinder bottom 6. A piston 4 and a piston shaft 15 are arranged in the cavity of the hydraulic cylinder, and the cavity of the hydraulic cylinder is divided into two parts by the piston;

[0035] The piston 4 and the piston shaft 15 in the hydraulic cylinder are integrally formed, and the hydraulic cylinder moves laterally relative to the piston, b...

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Abstract

The invention discloses an internal feedback axial-flow induced draft fan moving blade adjusting mechanism and a working method thereof. The mechanism comprises a control system, a servo valve, a center shaft, a hydraulic cylinder, a main shaft flange, a flow distribution rotating shaft and a displacement sensor; the flow distribution rotating shaft is connected with a piston shaft in the hydraulic cylinder through bearings at two ends; the displacement sensor is mounted at the end surface of the flow distribution rotating shaft, and is fixed through a screw; when the hydraulic cylinder drivesthe center shaft to move, the displacement sensor continuously sends signals to a detecting rod; the servo valve is connected with an oil port of the flow distribution rotating shaft; and the controlsystem is used for controlling the servo valve to supply oil to the flow distribution rotating shaft. The mechanism has the following advantages: two actions of rotation and axial movement of the hydraulic cylinder can be synchronously realized; a closed-loop control system is formed through the high-precision displacement sensor; the structure is simple; and the feedback response is quick and continuous.

Description

technical field [0001] The invention relates to the technical field of dynamic fluid machinery, in particular to an internal feedback type axial flow induced draft motor blade adjustment mechanism and a working method thereof. Background technique [0002] As one of the most important auxiliary equipment of thermal power plant boiler, induced draft fan is a driven fluid machine. It mainly relies on mechanical energy to increase the gas pressure and discharge gas to achieve the purpose of ventilation and air induction. In recent years, large-scale thermal power units generally adopt axial-flow induced draft fans mainly in the form of hydraulic cylinders. Change the fan regulation characteristic curve by changing the blade angle through the hydraulic system. The processing and manufacturing precision requirements are high, and the structure is relatively complex, but it has the characteristics of sensitive adjustment, low power consumption and high operating efficiency. To ...

Claims

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Application Information

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IPC IPC(8): F04D29/36F04D27/00
CPCF04D27/002F04D29/362
Inventor 朱学彪何健康黄益群李亚林钟伟辉候金彦杨秦王景全梁金洪
Owner 武汉思亘远电控设备有限公司
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