Protection method for compressor at high temperature and high pressure during heating of air conditioner

Abstract

The invention provides a protection method for a compressor at the high temperature and high pressure during heating of an air conditioner. The protection method comprises the steps that S1, a maximum value I1 and a larger value I2 of a current of an outdoor unit, and a maximum value T1 and a larger value T2 of the temperature of a coil are set in advance; S2, in the heating mode, a current sensor detects a current value I of the outdoor unit, a temperature sensor detects a temperature value T of the coil, and a judgement method of a control system comprises the steps that (1) when I is larger than or equal to I1, the control system controls an outdoor fan to stop working, and S3 is executed; (2) when I is smaller than I1 and T is larger than or equal to T1, the control system controls the outdoor fan to stop working, and S3 is executed; and (3) when I2 is smaller than or equal to I and I is smaller than I1, and T2 is smaller than or equal to T and T is smaller than T1, the control system controls the outdoor fan to stop working, and S3 is executed; and S3, the control system judges whether a recovery condition I or a recovery condition II is met or not, wherein the recovery condition I is that when I is smaller than I2 and T is smaller than T1, the outdoor unit returns to work, and operation returns to S2; and the recovery condition II is that when T is smaller than T2 and I is smaller than I1, the outdoor unit returns to work, and operation returns to S2. Through the adoption of the method, the high temperature and high pressure prevention accuracy of an air conditioning system is high.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to a method for protecting a compressor when the air conditioner is heating at high temperature and high pressure. Background technique [0002] Existing fixed-frequency air conditioners generally have two modes, cooling mode and heating mode, and the compressor is an important component of the air conditioner. The existing compressor protection method for high temperature and high pressure in the heating mode generally The protection method of measuring the temperature of the coil in the middle of the heat exchanger of the indoor unit is adopted, that is, a temperature detector is installed on the coil, and the working state of the motor of the outdoor unit is controlled by comparing the temperature detected by the temperature detector with the preset temperature. When the temperature detected by the sensor is higher than the preset value, the outdoor motor will be turned ...

AI Technical Summary

Problems solved by technology

[0002] Existing fixed-frequency air conditioners generally have two modes, cooling mode and heating mode, and the compressor is an important component of the air conditioner. The existing compressor protection method for high temperature and high pressure in the heating mode generally The protection method of measuring the temperature of the coil in the middle of the heat exchanger of the indoor unit is adopted, that is, a temperature detector is installed on the coil, and the working state of the motor of the outdoor unit is controlled by comparing the temperature detected by the temperature detector with the preset temperature. When the temperature detected by the sensor is higher than the preset value, the outdoor motor will be turned off, the outdoor fan will stop working, the overall load of the air conditioning system will decrease, and the high pressure of the air conditioning system will decrease accordingly. However, this method has the following defects: due to the lag in the detection of the temperature sensor, when When the temperature sensor detects the temperature value that is suitable for shutting down the outdoor motor, the current of the outdoor motor is often too large at this time, and the overall load of the air conditioning system increases. The saturation temperature corresponding to the high pressure, so when the temperature of the air conditioning system exceeds the design temperature, it is impossible to ensure that the high pressure of the air conditioning system does not exceed the design pressure at the same time

Therefore, when the temperature sensor detects that the temperature exceeds the design temperature, the compressor has been working under high pressure for a long time, the compressor current is too large, the winding heats up, the sealing of the cylinder becomes poor, it is easy to stop, and the service life is shortened. After the compressor stops working, the accuracy of the air-conditioning system’s anti-high temperature and high pressure protection is poor. After the heating mode of the air conditioner stops, it cannot continue to provide heat to the room, and the user experience decreases.

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