Centrifugal air compressor and control method and system thereof

Abstract

The invention relates to a centrifugal air compressor, a control method thereof and a control system thereof. The method is performed after the centrifugal air compressor works in a state corresponding to an appointed flow or pressure value input by a user and comprises the following steps of: acquiring the actual pressure and the actual flow of the front end of an emptying valve in the centrifugal air compressor; according to the corresponding relation between the pressure and the flow, determining a reference flow corresponding to the actual pressure; and adjusting the opening degree of the emptying valve to make the actual flow approximate to the reference flow. In a working process of the embodiment, the user only needs to input a required flow or pressure value and does not need to adjust the opening degree of the emptying valve according to experience, so the labor is saved and the reliability is ensured. In addition, the working state of the centrifugal air compressor is also monitored in real time, and when the centrifugal air compressor is determined to have a surging precursor, the corresponding relation between the pressure and the flow is adjusted to increase the reference flow, so the opening degree of the emptying valve is directly increased to a relatively greater extent, and surging is avoided.

Description

technical field [0001] The present invention relates to the technical field of air compressors, and more specifically relates to a centrifugal air compressor, a control method and a control system for the centrifugal air compressor. Background technique [0002] Centrifugal air compressor is a centrifugal air compressor. Its working principle is similar to that of a blower, that is, through the high-speed rotation of the impeller, the air is sucked in and then accelerated to rotate and generate centrifugal force, thereby generating dynamic pressure, which is then converted into static pressure. Then form the compressed air with a certain pressure and output it. [0003] The centrifugal air compressor belongs to the speed compressor, which is characterized by oil-free, compact structure, few vulnerable parts, high efficiency, and large flow rate. It is widely used in industries that require a large amount of low-pressure compressed air and oil-free compressed air. . [0004...

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Problems solved by technology

[0005] In the prior art, in order to make the air compressor work in a safe area, it is necessary to ensure a relatively large flow rate. Therefore, in actual use, the user generally opens the vent valve 14 according to experience and when the required air volume is small, to release air to the atmosphere. Direct discharge, this method needs to rely on the experience of the user, and is a manual operation, which has the problems of low reliability and more manpower

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