Active protecting control method of variable frequency air conditioner compressor

Abstract

The invention relates the technical field of air-conditioners, in particular to an active protecting control method of a variable frequency air conditioner compressor. Two temperature sensors are installed on a home use variable frequency air conditioner outdoor unit. The method includes the following steps that (1) the variable frequency air conditioner compressor is started, the opening degree of an electronic expansion valve is enabled to be operated preset time by a set original value; (2) BSH values are set according to different operational modes and four intervals are divided according to the different BSH values; (3) the opening degree of the electronic expansion valve is adjusted according to the intervals, wherein the BSH values are located in the intervals, the opening degrees of the electronic expansion valve in each interval can be limited between SFmin and SFmax; (4), when the opening degree value of the electronic expansion valve reaches the smallest opening degree SFmin, but the BUH values can also meet any one of a first interval, a second interval and a third interval in the step (3), and corresponding set is conducted to the frequency of the compressor. The active protecting control method of the variable frequency air conditioner compressor can guarantee reliable rotation of the compressor and prolong service life of the compressor.

Description

technical field [0001] The present invention relates to the technical field of air conditioners, and more specifically, to an active protection and control method for inverter air conditioner compressors. Background technique [0002] The frequency conversion air conditioner is based on the ordinary air conditioner, which uses a special frequency conversion compressor and adds a frequency conversion control system. Its basic structure and refrigeration principle are exactly the same as ordinary air conditioners. The host of the inverter air conditioner is automatically stepless variable, it can automatically provide the required cooling (heat) according to the room conditions; when the indoor temperature reaches the desired value, the host of the air conditioner will run at a constant speed that can accurately maintain this temperature, Realize "non-stop operation" to ensure the stability of the ambient temperature. [0003] "Frequency conversion" adopts relatively advance...

AI Technical Summary

Problems solved by technology

At this time, although the refrigerating machine oil inside the compressor seems to be sufficient, the refrigerating machine oil has actually been diluted or replaced by the refrigerant. This diluted refrigerating machine oil is pumped to various mechanical friction parts through the oil supply of the compressor, causing the actual operating oil film strength to be different. Sufficient conditions, resulting in abnormal wear of the mechanical friction part of the compressor, or even a stuck cylinder

[0006] The existing practice is to use passive control means in the performance design of the air conditioner, add a sight glass to the liquid storage tank and compression chamber of the compressor to observe, and simulate various harsh working conditions and usage conditions used by the user to judge , but often because the performance design cannot think of or simulate all the use cases and working conditions, so there are still abnormal damage to the compressor

Images