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Method for controlling increasing and decreasing number of machine heads of magnetic suspension compressor

A compressor and magnetic levitation technology, applied in pump control, machine/engine, mechanical equipment, etc., can solve problems such as compressor surge

Active Publication Date: 2020-07-17
QINGDAO HAIER AIR CONDITIONING ELECTRONICS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the sharp change of the compression ratio of the compressor, this way of directly stopping the head will also cause the surge of the compressor

Method used

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  • Method for controlling increasing and decreasing number of machine heads of magnetic suspension compressor
  • Method for controlling increasing and decreasing number of machine heads of magnetic suspension compressor
  • Method for controlling increasing and decreasing number of machine heads of magnetic suspension compressor

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Embodiment Construction

[0034] Preferred embodiments of the present invention are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention, and are not intended to limit the protection scope of the present invention.

[0035]In order to solve the technical problem of surge occurring in the process of increasing or decreasing the head of the existing magnetic levitation compressor, the present invention provides a method for controlling the increase or decrease of the head of the magnetic levitation compressor. The magnetic levitation compressor includes a load balancing valve and a plurality of heads each having a vane valve. In the process of increasing the machine head and reducing the machine head, the method includes: reducing the operating speed V of each running machine head to the surge speed Vo; controlling the opening of the guide vane valve of the ...

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Abstract

The invention relates to a method for controlling increasing and decreasing the number of machine heads of a magnetic suspension compressor. The magnetic suspension compressor comprises a load balancing valve and the plurality of machine heads, wherein each machine head is provided with a guide vane valve. In the processes of increasing and decreasing the machine heads, the method comprises the steps of reducing the running speed V of each running machine head to a surge speed Vo; controlling the opening degree of the each guide vane valve of each to-be-started machine head and each to-be-stopped machine head; and opening the load balancing valve before the to-be-started machine heads are started and the to-be-stopped machine heads are stopped, and controlling the opening degree of the load balancing valve based on the compression ratio of the magnetic suspension compressor. In the processes of increasing and decreasing the number of the machine heads, the running speed of the runningmachine heads is reduced to the surge speed of the magnetic suspension compressor in the method, so that the magnetic suspension compressor runs on a surging line, and meanwhile, the opening degrees of the load balancing valve and the guide vane valves are controlled so that the compression ratio of the magnetic suspension compressor can be reduced, so that the surge of the compressor is avoided,and the smooth processes of increasing and decreasing the machine heads are ensured.

Description

technical field [0001] The invention relates to a method for controlling a compressor, in particular to a method for controlling the increase and decrease of heads of a magnetic levitation compressor. Background technique [0002] Magnetic levitation compressors generally refer to compressors combined with magnetic levitation bearings, such as magnetic levitation centrifugal compressors. Magnetic suspension bearing is a kind of magnetic bearing that uses magnetic field to make the rotor suspend, so that there will be no mechanical contact and mechanical friction during rotation. By using this magnetic bearing, the compressor does not need a lubricating oil system, so various problems caused by the traditional lubricating oil system no longer exist. Magnetic levitation compressors generally use digital frequency conversion control technology, so that they can operate at full load or at very low load (such as 20% partial load). The combination of magnetic levitation technolo...

Claims

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Application Information

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IPC IPC(8): F04D27/02
CPCF04D27/0253
Inventor 王明久贺雪飞刘银
Owner QINGDAO HAIER AIR CONDITIONING ELECTRONICS CO LTD
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