Pre-protection method for condensing unit and condensing unit

Abstract

The invention provides a pre-protection method for a condensing unit. The condensing unit comprises a compressor, a digital compressor with a capacity adjusting function and a switching element for controlling loading/unloading switching of the digital compressor. The pre-protection method comprises the following steps of monitoring the numerical value of working parameters of the condensing unit, comparing the monitored numerical value of the working parameters with a preset value corresponding to the working parameters, and controlling the action of the switching element based on a comparison result so as to adjust the maximum allowable loading time percentage of the compressor. In addition, the invention further provides a computer readable medium storing a pre-protection program, a controller comprising the computer readable medium and the corresponding condensing unit. According to the technical scheme, a compressor unit can keep good operation in a severe environment.

Description

technical field [0001] The present invention relates to the field of condensing units, more specifically, the present invention relates to a method capable of pre-protecting condensing units, a computer-readable medium including a program for realizing the method, a controller including the computer-readable medium, and a computer-readable medium including The controller for the condensing unit. Background technique [0002] Condensing units are often used in cold chains such as showcases in convenience stores or supermarkets or cold storage to maintain the temperature of stored items in a relatively constant low temperature environment. [0003] Generally speaking, the condensing unit has a controller, which can control the start and stop of the compressor according to the relationship between the suction pressure of the compressor (here, a digital compressor with capacity adjustment function) and the set value, and at the same time through Solenoid valve to adjust the out...

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Problems solved by technology

[0004] In practical application, the inventor noticed that when the condensing unit operates in a bad environment, for example, in the case of unfavorable ventilation conditions, extreme high ambient temperature or dirty blockage of the condenser, the condensing pressure will continue to rise, once When the rated threshold is reached, it will trigger the opening of the high voltage safety switch, resulting in high voltage alarm and shutdown

This kind of unexpected shutdown is unfavorable, it will cause the temperature of the stored goods and food to rise, which will affect the storage quality, and may cause frequent start / stop of the compressor, which will not only cause large temperature fluctuations of the refrigerated items, but also easily cause Wear and tear of the machine thereby shortening the service life of the machine

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