Detection and protection method of lack of fluorine of air-conditioners

[0019] The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0020] The equipment used in the fluorine deficiency detection and protection method of the air conditioner of the present invention includes a first temperature sensor for detecting the temperature of the inner coil, a second temperature sensor for detecting the ambient temperature, a single-chip microcomputer, and an alarm device. The first temperature sensor and the second temperature sensor are both Connect with the I/O port of the single-chip microcomputer in the air conditioner, such as figure 2 The temperature sensor shown is composed of a thermistor and an ordinary resistor, and the temperature is measured by changing the voltage value input into the single-chip microcomputer through the change of the thermistor resistance. The alarm device is also connected to the I/O port of the single-chip microcomputer in the air conditioner, such as image 3 As shown, it is composed of a resistor and a buzzer, and the buzzer works by sending out an electric signal.

[0021] As we all know, the difference between the temperature of the inner coil of the air conditioner and the ambient temperature can fully reflect whether the air conditioner is working properly. The temperature of the inner coil is the highest cooling or heating temperature of the air conditioner, which has a large difference with the ambient temperature. The two parameter values ​​of the coil temperature and the ambient temperature can fully reflect the operating conditions of the air conditioner, that is, whether the air conditioner lacks fluorine.

[0022] The method for detecting and protecting the fluoride deficiency of the air conditioner of the present invention includes the following steps:

[0023] According to the operating data measured when the compressor of the air conditioner is running without fluorine shortage, the absolute value of the difference between the temperature of the inner coil and the ambient temperature is at least ΔT 0 , ΔT 0 It is a reference value for whether the air conditioner is deficient in fluorine, that is to say, when the compressor works without deficient fluorine, ΔT 0 It is a limit value below which the air conditioner lacks fluorine, otherwise the air conditioner does not lack fluorine. In fact, depending on the manufacturer and model of the air conditioner, the compressor of the air conditioner runs without fluorine shortage. The absolute value of the difference between the temperature of the inner coil and the ambient temperature is ΔT 0 Not all the same. In this embodiment, the experimental data of the air conditioner used shows that ΔT 0 It is 3°C.

[0024] Turn on the power of the air conditioner, select the cooling or heating mode, the compressor starts to run, and the single-chip microcomputer inside the air conditioner starts timing;

[0025] After the compressor is turned on for 6-10 minutes, the temperature value of the inner coil and the ambient temperature are measured by the first temperature sensor and the second temperature sensor. The single-chip microcomputer processes the above two temperature values ​​to obtain the inner plate The absolute value of the difference between the temperature value of the tube and the ambient temperature value ΔT 1 , And ΔT 1 Compared with 3℃, if ΔT 1 If the temperature is greater than or equal to 3°C, it is judged that the air conditioner is not lacking in fluorine, and the air conditioner continues to operate; if ΔT 1 If it is less than 3°C, it is judged that the air conditioner is short of fluorine. At this time, the air conditioner will send a short alarm through the buzzer device on the controller, but the compressor will not stop running. The 6-10 minutes after the compressor starts up and runs, it is after the ΔT 0 After a large amount of data collection and analysis for the 3℃ air conditioner, it is confirmed that if the air conditioner is not lacking in fluorine within this time period, the absolute value of the difference between the temperature value of the inner coil and the ambient temperature value must be greater than or Equal to ΔT 0 , Which is 3°C.

[0026] When the compressor continues to run for 3-6 minutes, the temperature of the inner coil and the ambient temperature are measured again by the first temperature sensor and the second temperature sensor. The single-chip microcomputer processes the above two temperature values ​​to obtain The absolute value of the difference between the temperature value of the inner coil and the ambient temperature value ΔT 2 , And ΔT 2 Compared with 3℃, if ΔT 2 If the temperature is greater than or equal to 3℃, it is judged that the air conditioner is not lacking in fluorine, the alarm of the alarm device is released, and the air conditioner continues to run; if ΔT 2 If the temperature is less than 3°C, it can be determined that the air conditioner has been short of fluorine, and the air conditioner stops running to realize the protection of the compressor. This step is aimed at the slow cooling speed caused by the aging of the equipment after the compressor of the air conditioner has been used for a certain period of time. In this case, the compressor continues to run for 3-6 minutes to fully determine whether the air conditioner lacks fluorine. This time period of 3-6 minutes is also a time period for ΔT 0 After a large amount of data collection and analysis for the 3℃ air conditioner, it is confirmed that if the air conditioner is not lacking in fluorine within this time period, the absolute value of the difference between the temperature value of the inner coil and the ambient temperature value must be greater than or Equal to ΔT 0 , Which is 3℃, and if it is less than ΔT 0 , It can be determined that the air conditioner lacks fluorine.