A New Axial Flow Fan Static Blade Adjustment System

Abstract

A new type of stator blade adjustment system for axial flow fans, including a servo motor, a two-way quantitative gear pump, and an oil tank. The two-way quantitative gear pump is fixed inside the oil tank and driven by the servo motor to rotate. The adjustment cylinder is used to adjust the angle of the vane. The two-way quantitative gear pump is respectively connected to the two hydraulic cylinders through two oil circuits and provides pressure oil for them. The hydraulic cylinder drives the adjustment cylinder to adjust the angle of the vane. It includes position closed-loop control and pressure closed-loop control, which can accurately control the speed of the servo motor, the position and pressure of the hydraulic system, and meet various work requirements of the stator blade adjustment system, ensuring that the system can accurately adjust the angle of the stator blades, It also has the advantages of energy saving and environmental protection, insensitivity to oil pollution and greatly reducing the volume of hydraulic devices.

Description

technical field [0001] The invention relates to an AC servo hydraulic control system of an axial flow fan stator blade adjustment mechanism, in particular to a novel axial flow fan stator blade adjustment system. Background technique [0002] Axial fan is a kind of mechanical equipment that provides compressed gas to equipment. At present, it is mainly used in catalytic cracking units of oil refineries, blast furnace blower stations in metallurgical industry, blast furnace gas combined cycle power generation systems, compressor stations in fermentation industry, and large air compressor stations. points, wind tunnel tests, etc. Axial flow fans need to adjust the air intake according to the technological requirements of the equipment, and the key to adjusting the air intake is to adjust the angle of the fan's stator blades. At present, the stator blade adjustment system of axial flow fan mostly adopts a valve-controlled position control system composed of three-phase asynchr...

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Problems solved by technology

However, the current valve control system has the following shortcomings: the servo valve has high requirements on the quality of the oil, and the system needs to replace the hydraulic oil regularly. If it is not maintained in time, the valve core of the servo valve will be stuck, the system will not work, and the production line will be shut down. Bad consequences; the working efficiency of the servo valve is low, the speed of the three-phase asynchronous motor cannot be adjusted during the system operation, and the energy loss is serious; due to the serious energy loss, the temperature rise of the system is large, and a cooler needs to be added; the valve control system needs to provide constant pressure Oil sources, which occupy a large volume at the production site

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