Method for judging running states of magnetic suspension cooling water units in freezing station control systems

A technology for chillers and control systems, applied in refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve the problems of inability to confirm the full-load use current of magnetic levitation centrifugal units and different operating states, and achieve obvious energy-saving effect and increase load capacity. , low cost effect

Active Publication Date: 2015-06-03
青岛中增能源科技有限公司
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Problems solved by technology

[0005] In the prior art, screw compressors and ordinary centrifugal units often use current to judge the operating status of the compressor, but the operating status of the magnetic levitation centrifugal unit in the refrigeration station system is different under different operating conditions, and it is impossible to determine the full capacity of the magnetic levitation centrifugal unit in the working state. The load is confirmed using the current

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  • Method for judging running states of magnetic suspension cooling water units in freezing station control systems

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Embodiment 1

[0019] A method for judging the operating state of a maglev chiller in a control system of a freezing station, the specific steps are as follows:

[0020] 1) Use a current transformer to read the operating current of the maglev chiller;

[0021] 2) After comparing the operating current with the maximum current of the control system of the refrigeration station, the state of the maglev chiller is judged, and thus the full load state of the compressor in the maglev chiller is judged.

[0022] In step 1), when the ratio of the operating current to the maximum current is greater than or equal to 1, continue to judge whether the ratio of the total pressure at the outlet of the compressor to the total pressure at the inlet is greater than or equal to 2.6. When the ratio of the running current to the full load current is less than 1, continue to judge whether the running speed of the compressor is less than or equal to 1.05 times the speed at the time of surge.

[0023] In the step ...

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Abstract

The invention relates to the field of control for integrated freezing stations, in particular to a method for judging running states of magnetic suspension cooling water units in freezing station control systems. The method includes particular operation steps of 1), reading running currents of the magnetic suspension cooling water units by the aid of current transformers; 2), comparing the running currents to the maximum currents of the freezing station control systems, judging states of the magnetic suspension cooling water units and judging full-load states of compressors in the magnetic suspension cooling water units. The method has the advantages that communication with the magnetic suspension compressors is established, and currents, compression ratios and operating speeds of the compressors are detected, so that the running states of the compressors can be determined; signals of internal sensors of the compressors are read, accordingly, equipment such as the current transformers can be reduced, excellent control effects can be realized on the basis of extremely low cost, the load capacity of the magnetic suspension cooling water units can be improved, the judgment precision and credibility can be improved to a certain extent, obvious energy-saving effects can be realized, and the method is suitable to be popularized and utilized in the industry.

Description

technical field [0001] The invention relates to the field of integrated refrigeration station control, in particular to a method for judging the operating state of a magnetic levitation chiller in a refrigeration station control system. Background technique [0002] The magnetic levitation centrifugal chiller is a high-efficiency unit. The refrigerant used is R134a environmentally friendly refrigerant. It uses a magnetic levitation oil-free centrifugal compressor, which is a two-stage compression mechanical cycle compressor. There is an intermediate suction interface between the first-stage compressor cavity and the second-stage compressor cavity, which can suck a medium-pressure refrigerant to realize the economizer cycle. Based on this, an economizer refrigeration cycle is adopted, and an economizer is installed between the evaporator and the condenser. The liquid refrigerant condensed by the condenser is divided into two circuits, the magnetic levitation and the magnetic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B49/02
CPCF25B49/022F25B2500/05F25B2600/02
Inventor 韩冰王进杰
Owner 青岛中增能源科技有限公司
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