Air conditioner and electronic expansion valve fault detection method thereof

Abstract

The invention relates to the technical field of air conditioners, in particular to an air conditioner and an electronic expansion valve fault detection method thereof. The air conditioner comprises asecond indoor unit and at least one first indoor unit. The electronic expansion valve fault detection method of the air conditioner comprises the steps that under the condition that the first indoor units are in the refrigeration working condition, the second indoor unit is stopped; the first air pipe temperature of the first indoor units and the second air pipe temperature of the second indoor unit are obtained; and whether an electronic expansion valve of the second indoor unit breaks down or not is judged at least according to the first air pipe temperature and the second air pipe temperature. According to the electronic expansion valve fault detection method, self-detection of faults of the electronic expansion valves of the indoor units is achieved, and the problem that the refrigeration effect of the air conditioner is affected due to refrigerant leakage caused by the faults of the corresponding electronic expansion valves when the indoor units are in a shutdown state is solved.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to an air conditioner and a fault detection method for an electronic expansion valve thereof. Background technique [0002] The one-drag multi-air conditioner is composed of one outdoor unit and multiple indoor units. When the one-drag multi-air conditioner is running, usually only a part of the indoor units are in the running state, while the rest are in the off state. For example, when the one-to-many air conditioner is running in the cooling mode, the running indoor unit controls the flow of refrigerant through the electronic expansion valve, thereby adjusting the cooling effect on the indoor side; Refrigerant circulation in the indoor unit stops. [0003] Due to the complicated installation of one-to-multiple air conditioners, if the protection is not in place, the expansion valve will fail to close completely. For example, the cause of the failure may be: the electron...

AI Technical Summary

Problems solved by technology

[0003] Due to the complicated installation of one-to-multiple air conditioners, if the protection is not in place, the expansion valve will fail to close completely. For example, the cause of the failure may be: the electronic expansion valve is stuck due to tiny impurities in the pipeline. In this way, when the one-to-many air conditioner is actually working, the electronic expansion valve of the shut-off indoor unit cannot be completely closed, causing refrigerant leakage to the pipeline of the shut-off indoor unit

The leakage of the electronic expansion valve of the shutdown indoor unit will not only affect the user experience, but may also damage the compressor of the multi-air conditioner

However, there is currently no effective detection scheme for the leakage of refrigerant caused by the failure of the electronic expansion valve of the shutdown indoor unit to be completely closed. It can only be judged by the after-sales personnel on the spot.

Images