Abnormal detection method and device for a chiller and a slide valve of a compressor in a chiller

Abstract

The invention discloses a water chiller and a method and device for detecting the abnormality of a slide valve of a compressor in the water chiller. The compressor comprises a loading valve and the slide valve, the slide valve comprises multiple capacity adjusting valves, and all the capacity adjusting valves correspond to different compressor output capacities. The method includes the following steps that the water chiller is controlled to enter a capacity adjusting automatic detection mode; after the water chiller enters the capacity adjusting automatic detection mode, the loading valve is controlled to be in a working state, the compressor is controlled to operate according to preset frequency, all the capacity adjusting valves are controlled to be switched on separately according to apreset sequence, and operation parameters of the water chiller are obtained when each capacity adjusting valve is switched on alone; according to the preset sequence and the operation parameters, whether or not the slide valve is abnormal is judged. With the method, whether or not the slide valve is abnormal can be judged rapidly and effectively, and the accuracy of maintaining the water chiller and the operation reliability of the water chiller are easily improved.

Description

technical field [0001] The invention relates to the technical field of refrigeration, in particular to a method for detecting abnormality of a slide valve of a compressor in a chiller, a device for detecting abnormality of a slide valve of a compressor in a chiller, and a chiller. Background technique [0002] Compressors (such as screw compressors) usually use slide valves for capacity adjustment, that is, set fixed slide valve adjustable positions (such as 75% adjustable valves, 50% adjustable valves, and 25% adjustable valves) to adjust and control compression. output capability of the machine. [0003] However, due to the similar appearance of the valve body coils, it is easy to cause wrong connection between the valve body and the valve body or between the valve body and the electric control wiring. The body is wrongly connected, or the electric control wiring of the 75% adjustable valve is connected to the coil of the 25% adjustable valve, resulting in a situation whe...

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Problems solved by technology

[0003] However, due to the similar appearance of the valve body coils, it is easy to cause wrong connection between the valve body and the valve body or between the valve body and the electric control wiring. The body is wrongly connected, or the electric control wiring of the 75% adjustable valve is connected to the coil of the 25% adjustable valve, resulting in a situation where the target control adjustable value is different from the actual adjustable value, resulting in a discrepancy between the system output and the actual demand, which is not conducive to the operation of the unit. reliable operation

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