CN101566517B - Judgment Method of Refrigerant Leakage in Air Conditioner - Google Patents

Abstract

The invention discloses a method for judging refrigerant leakage in an air conditioner, which comprises the following steps: a. Recording the temperature T of the indoor coil before starting the compressor; Otherwise, return to step a; c, determine whether the compressor continues to run for x minutes, and if yes, proceed to the next step, otherwise return to step b; d, record the indoor coil temperature T' and the simultaneous indoor temperature when the compressor continues to run for x minutes T _r ; e. Calculate the temperature difference between the indoor coil temperature T' when the compressor runs continuously for x minutes and the indoor coil temperature T before the compressor starts, and calculate the indoor coil temperature T when the compressor runs continuously for x minutes ' and the temperature difference between the indoor temperature Tr at the same time, judge whether the two temperature differences are less than y, if yes, enter step f, otherwise return to step b after the compressor running time is cleared; f, stop and report failure. The method for judging refrigerant leakage in the air conditioner has high accuracy.

Description

Judgment Method of Refrigerant Leakage in Air Conditioner

technical field

The invention relates to a method for judging refrigerant leakage in an air conditioner.

Background technique

The refrigerant in the air conditioner (machine) is likely to cause a large amount of leakage due to installation, welding, vibration and other reasons. When a large amount of refrigerant leaks (generally refers to the leakage of more than 40% of the refrigerant in the system), once the air conditioner fails to stop in time and reports a failure, but continues to run for a long time without refrigerant, the motor in the compressor will overheat , eventually damage the compressor, and even cause safety accidents.

The traditional method for judging refrigerant leakage in air conditioners is generally to detect the air pressure in the air return pipe of the compressor. When the pressure value is lower than the alarm setting value, the compressor stops and reports a failure. But the above method has a big defect: the air pressure in the air return pipe of the compressor is very low in the heating mode of the heat pump air conditioner. The lowest pressure value in the return air pipe of the unit in normal operation (1bar), so the alarm setting value is generally 0.5bar, but the air pressure in the return air pipe of the compressor is very high in the cooling mode (up to 8bar in the cooling mode), so the alarm setting If the set value is low, the alarm pressure value may be reached only after the unit has leaked more than 80% of the refrigerant, and the system cannot provide protection for the refrigerant leaking within 80%.

The publication number CN1755341A on the website of the State Intellectual Property Office discloses a method for judging refrigerant leakage. It judges whether the unit refrigerant leaks according to whether the indoor coil temperature is higher than the set coil temperature in cooling mode. . However, this method is only applicable to cooling mode, not heating mode; and this method only detects one temperature value, and the temperature sensor that detects the temperature of the indoor coil in actual operation is prone to deviation, which leads to false or missed failures. Therefore, the accuracy of this method is low.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method for judging refrigerant leakage in an air conditioner with high accuracy.

The technical solution of the present invention is to provide a method for judging refrigerant leakage in an air conditioner, which includes the following steps:

a. Record the indoor coil temperature T before the compressor starts;

b. Determine whether the compressor is started, if yes, proceed to the next step, otherwise return to step a;

c. Determine whether the compressor continues to run for x minutes, if yes, proceed to the next step, otherwise return to step b;

d. Record the indoor coil temperature T' when the compressor runs continuously for x minutes and the indoor temperature Tr at the same time;

e. Calculate the temperature difference between the indoor coil temperature T' when the compressor runs continuously for x minutes and the indoor coil temperature T before the compressor starts, and calculate the sum of the indoor coil temperature T' when the compressor runs continuously for x minutes The temperature difference between the indoor temperature Tr at the same time, and judge whether the above two temperature differences are less than y, if so, enter step f, if otherwise, return to step b after the compressor running time is cleared;

f. The compressor stops and reports a failure.

Compared with the prior art, the method for judging refrigerant leakage in the air conditioner of the present invention has the following significant advantages and beneficial effects:

Compared with the traditional judging method, the judging method of refrigerant leakage in the air conditioner of the present invention has high sensitivity, and can stop and report a fault when the air conditioner refrigerator leaks 40%. Compared with the judging method disclosed on the website of the State Intellectual Property Office, the judging method of refrigerant leakage in the air conditioner of the present invention is based on the indoor coil temperature T' when the compressor continues to run for x minutes and the indoor coil temperature T' before the compressor starts. The temperature difference between the temperature T is used to judge whether there is a leak, and the temperature sensor that measures the two temperatures is the same temperature sensor, so even if the temperature value measured by the temperature sensor deviates (high or low), the above two There will be no deviation in the temperature difference between the temperatures, which effectively reduces the probability of false alarms or missed alarms, and the accuracy of judgment is high; and this method is applicable to both cooling and dehumidification modes, as well as heating modes. wide. Furthermore, since the method for judging refrigerant leakage in the air conditioner of the present invention must simultaneously satisfy that the temperature difference between the indoor coil temperatures at different times is less than the set value y and the temperature difference between the indoor coil temperature and the indoor ambient temperature is less than the set value y Only stop and report failure, so the probability of false alarm of the present invention is lower, and the accuracy rate of judgment is more ideal. Moreover, the method for judging refrigerant leakage in the air conditioner of the present invention will update the detection result every time the compressor runs continuously for x minutes, thus realizing real-time protection and dynamic update of the air conditioning system.

Description of drawings

Fig. 1 is a schematic diagram of the judging process of the method for judging refrigerant leakage in an air conditioner in the cooling or dehumidification mode of the present invention.

Fig. 2 is a schematic diagram of the judgment flow of the method for judging refrigerant leakage in the air conditioner in the heating mode of the present invention.

Detailed ways

The method for judging refrigerant leakage in the air conditioner of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, but the present invention is not limited to the following specific embodiments.

As shown in Figure 1, an embodiment of the method for judging refrigerant leakage in an air conditioner of the present invention in refrigeration or dehumidification mode, it includes the following steps:

a. Record the indoor coil temperature T before the compressor starts;

b. Determine whether the compressor is started, if yes, proceed to the next step, otherwise return to step a;

c. Determine whether the compressor continues to run for 8 minutes, if yes, proceed to the next step, otherwise return to step b;

d. Record the indoor coil temperature T' and the indoor temperature Tr at the same time when the compressor runs continuously for 8 minutes;

e. Calculate the temperature difference between the indoor coil temperature T' when the compressor runs continuously for 8 minutes and the indoor coil temperature T before the compressor starts, calculate the indoor coil temperature T' when the compressor runs continuously for 8 minutes and The temperature difference between the indoor temperatures Tr at the same time, and judge whether the above two temperature differences are less than 5°C, if yes, enter step f, if otherwise, return to step b after clearing the running time of the compressor;

f. The compressor stops and reports a fault.

As shown in Figure 2, an embodiment of the method for judging refrigerant leakage in the air conditioner of the present invention in the heating mode includes the following steps:

a. Record the indoor coil temperature T before the compressor starts;

b. Determine whether the compressor is started, if yes, proceed to the next step, otherwise return to step a;

c. Determine whether the compressor continues to run for 8 minutes, if not, return to step b; if yes, it is necessary to determine whether the unit is defrosting, if yes, end the judgment process of refrigerant leakage in the entire air conditioner, if not, continue to step d .

d. Record the indoor coil temperature T' and the indoor temperature Tr at the same time when the compressor runs continuously for 8 minutes;

e. Calculate the temperature difference between the indoor coil temperature T' when the compressor runs continuously for 8 minutes and the indoor coil temperature T before the compressor starts, calculate the indoor coil temperature T' when the compressor runs continuously for 8 minutes and The temperature difference between the indoor temperature Tr at the same time, and judge whether the above-mentioned two temperature differences are less than 8°C, if so, enter step f, if otherwise, return to step b after clearing the running time of the compressor;

f. The compressor stops and reports a fault.

Claims (6)

1. the determination methods of freezing medium leakage in the air conditioner, it may further comprise the steps:

Indoor coil pipe T before a, recording compressed machine start;

Whether b, judgement compressor start, if then carry out next step, if otherwise return step a;

C, judged compressor whether continuous service x minute, if then carry out next step, if otherwise return step b;

D, the indoor coil pipe T ' of recording compressed machine continuous service in the time of x minute and indoor temperature T meanwhile _r

E, calculate the temperature difference between the indoor coil pipe T before the indoor coil pipe T ' of compressor continuous service in the time of x minute and the compressor start, the calculating indoor coil pipe T ' of compressor continuous service in the time of x minute and indoor temperature T meanwhile _rBetween the temperature difference, and whether judge above-mentioned two temperature difference less than y, if then enter step f, if otherwise will return step b after the compressor operating time zero clearing;

F, compressor shutdown are also reported fault.

2. the determination methods of freezing medium leakage in the air conditioner according to claim 1 is characterized in that: be meant 5～10 minutes in the described x of step c minute.

3. the determination methods of freezing medium leakage in the air conditioner according to claim 2 is characterized in that: be meant 8 minutes in the described x of step c minute.

4. the determination methods of freezing medium leakage in the air conditioner according to claim 1 is characterized in that: the described y of step e is meant 3～8 ℃ when refrigeration or dehumidification mode, be meant 5～10 ℃ when heating mode.

5. the determination methods of freezing medium leakage in the air conditioner according to claim 4 is characterized in that: the described y of step e is meant 5 ℃ when refrigeration or dehumidification mode, be meant 8 ℃ when heating mode.

6. the determination methods of freezing medium leakage in the air conditioner according to claim 1 is characterized in that: when heating mode, step c is, judges compressor whether continuous service x minute, if otherwise return step b; If need also then to judge whether unit defrosts, if then finish the deterministic process of freezing medium leakage in the whole air conditioner, if otherwise continue to enter steps d.

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