Air conditioner fluorine shortage judgment and protection method

Abstract

The invention discloses an air conditioner fluorine shortage judgment protection method which is characterized in that when an air conditioner runs, the temperature of an indoor coil pipe before a compressor is started is recorded, and according to the running mode of the air conditioner, whether the current temperature of the indoor coil pipe and the running time of the compressor meet the preset condition for entering fluorine shortage protection or not is detected; if so, enabling the air conditioner to enter fluorine-deficient protection; according to the operation mode of the air conditioner, whether fluorine deficiency judgment is conducted on the air conditioner or not is determined, and if yes, fluorine deficiency judgment is conducted on the air conditioner again; and after the number of times of fluorine shortage judgment of the air conditioner meets the preset number of times, whether the outdoor unit is turned off or not and whether the indoor unit is kept in the current state to run or enters the cold air prevention mode or not are determined, and if yes, the outdoor unit is turned off, and the indoor unit is kept in the current state to run or enters the cold air prevention mode.

Description

Technical Field

[0001] The invention relates to the technical field of air conditioners, and in particular to a method for judging and protecting air conditioners from fluorine deficiency. Background Art

[0002] The principle of air conditioning mainly relies on Freon as a refrigerant, which circulates in the air conditioning system to transfer heat. Freon used in the air conditioning system is a medium that circulates between the evaporator and the condenser, and achieves cooling or heating effects through a vapor compression refrigeration cycle. This process includes four core steps: compression-condensation-throttling-evaporation. The role of Freon in the air conditioning system is crucial. It not only transfers heat, but also ensures that the air conditioner can effectively cool or heat. If there is insufficient Freon in the air conditioning system, it will lead to a decrease in the cooling or heating effect, and even damage the compressor (compression step). Therefore, checking the amount of refrigerant in the air conditioning system is an important part of maintaining the normal operation of the air conditioner. The general existing technology is to judge whether the refrigerant is leaking by simply comparing the difference between the room temperature and the pipe temperature, which is easy to cause misjudgment and cause the air conditioner to fail to operate normally or even be damaged, affecting user use.

[0003] Therefore, based on the above technical problems, the present application proposes a method for judging and protecting air conditioner fluorine deficiency with high safety and wide applicability. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a method for judging and protecting air conditioner fluorine deficiency with high safety and wide applicability.

[0005] In order to achieve the above-mentioned purpose, the present invention provides an air-conditioning fluorine deficiency judgment and protection method, which is characterized by: when the air-conditioner is running, recording the indoor coil temperature before the compressor is turned on, and according to the operating mode of the air-conditioner, detecting whether the current temperature of the indoor coil and the compressor operating time meet the preset conditions for entering the fluorine deficiency protection, and if so, making the air-conditioner enter the fluorine deficiency protection; according to the operating mode of the air-conditioner, determining whether to perform a fluorine deficiency judgment on the air-conditioner again, and if so, making the air-conditioner perform a fluorine deficiency judgment again; when the number of fluorine deficiency judgments of the air-conditioner meets the preset number of times, determining whether to turn off the outdoor unit and the indoor unit to maintain the current state of operation or enter the cold wind protection mode, and if so, the outdoor unit is turned off and the indoor unit maintains the current state of operation or enters the cold wind protection mode.

[0006] Furthermore, when the air conditioner is running in cooling or dehumidification mode, the preset condition for judging the lack of fluorine is: recording the indoor coil temperature before the compressor is turned on, and when the compressor has been working continuously for more than a first preset time, the current temperature of the indoor coil is greater than or equal to the first preset temperature.

[0007] Furthermore, after the air conditioner determines that it has entered the fluorine deficiency protection, the outdoor unit is turned off and the indoor unit maintains the current state of operation; when the compressor stops running for more than a second preset time and then starts again, the fluorine deficiency protection judgment is re-performed.

[0008] Furthermore, when the air conditioner determines that the number of times of fluorine deficiency protection meets a first preset number, the outdoor unit is turned off.

[0009] Furthermore, when the air conditioner is running in heating mode, the preset conditions for judging the lack of fluorine are: after recording the indoor coil temperature before the compressor is turned on, the compressor starts; when the indoor coil temperature is less than or equal to the second preset temperature, after the compressor has been working continuously for more than a third preset time, the current temperature of the indoor coil is less than or equal to the third preset temperature.

[0010] Furthermore, when the air conditioner is determined to enter the fluorine deficiency protection mode, the outdoor unit is turned off and the indoor unit enters the cold wind protection mode.

[0011] Furthermore, when the air conditioner is running in heating mode, the preset conditions for judging the lack of fluorine are: after recording the indoor coil temperature before the compressor is turned on, the compressor starts; when the indoor coil temperature is greater than a fourth preset temperature, the compressor continuously works for a time greater than the fourth preset time, and the current temperature of the indoor coil is less than or equal to a fifth preset temperature.

[0012] Furthermore, after the air conditioner determines that it has entered the fluorine deficiency protection, the outdoor unit is turned off and the indoor unit maintains the current state of operation; when the compressor stops running for more than the fifth preset time and then starts again, the fluorine deficiency protection judgment is re-performed.

[0013] Furthermore, when the air conditioner determines that the number of fluorine deficiency protections meets a second preset number of times, the outdoor unit is turned off and the indoor unit enters a cold wind protection mode.

[0014] The present invention adopts the above-mentioned solution, and its beneficial effects are: Safety: The present invention can accurately protect the air conditioner from fluorine deficiency by using the judgment scheme for fluorine deficiency in the air conditioner, thereby improving safety and preventing the air conditioner compressor from being damaged due to the installation worker forgetting to open the valve or due to extreme fluorine deficiency.

[0015] Wide applicability: The judgment scheme for air conditioner fluorine deficiency of the present invention is applicable to all air conditioners used. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The schematic diagram of the air conditioner fluorine deficiency protection method in an embodiment of the present invention.

[0017] Figure 2 The flow chart of the air conditioner fluorine deficiency judgment and protection method in the embodiment of the present invention is as follows Figure 1 .

[0018] Figure 3 The flow chart of the air conditioner fluorine deficiency judgment and protection method in the embodiment of the present invention is as follows Figure 2 .

[0019] Figure 4 This is an assignment diagram of the air conditioner fluorine deficiency judgment and protection method in an embodiment of the present invention.

[0020] Figure 5 This is a wind speed setting diagram for an air conditioner fluorine deficiency judgment and protection method in an embodiment of the present invention.

[0021] Figure 6 Schematic diagram of the side view structure of the indoor unit in an embodiment of the present invention. DETAILED DESCRIPTION

[0022] In order to facilitate the understanding of the present invention, the present invention is described more fully below with reference to the accompanying drawings. The accompanying drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. The purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly and comprehensively understood.

[0023] See attached Figure 1 As shown, in an embodiment of the present invention, a method for judging and protecting a fluorine deficiency in an air conditioner is provided, characterized in that: when the air conditioner is running, the indoor coil temperature before the compressor is turned on is recorded, and according to the operating mode of the air conditioner, the current temperature of the indoor coil and the operating time of the compressor are detected to see whether they meet the preset conditions for entering the fluorine deficiency protection, and if so, the air conditioner enters the fluorine deficiency protection; according to the operating mode of the air conditioner, it is determined whether to make a fluorine deficiency judgment on the air conditioner again, and if so, the air conditioner is made to make a fluorine deficiency judgment again; when the number of fluorine deficiency judgments on the air conditioner meets the preset number, it is determined whether to shut down the outdoor unit and keep the indoor unit running in the current state or enter the cold wind prevention mode, and if so, the outdoor unit is shut down and the indoor unit keeps running in the current state or enters the cold wind prevention mode, and whether the air conditioner enters the fluorine deficiency protection is judged by a variety of preset conditions, thereby ensuring the accuracy of the air conditioner entering the fluorine deficiency protection and the effectiveness of the fluorine deficiency protection, and effectively extending the service life of the air conditioner.

[0024] In the embodiment of the present invention, whether the air conditioner enters the fluorine deficiency protection is determined according to the following conditions: The first one, see the attached Figure 2As shown, when the air conditioner runs in cooling or dehumidification mode: record the indoor coil temperature Tp0 before the compressor is turned on, when the continuous working time of the compressor is greater than the continuous working time of the compressor 1 Ct1 (the first preset time), the current temperature of the indoor coil Tp0 is greater than or equal to the indoor coil temperature Tp0-n℃ before the compressor is turned on (the first preset temperature), thereby judging that the air conditioner enters the fluorine deficiency protection; after judging that the air conditioner enters the fluorine deficiency protection, the outdoor unit is turned off and the indoor unit maintains the current state of operation; when the compressor stops running for more than 3 minutes (the second preset time) and then starts again, the air conditioner is re-judged for fluorine deficiency protection; when the air conditioner judges that the number of fluorine deficiency protection meets 2 times (the first preset number), the outdoor unit is turned off.

[0025] It should be noted that when the air conditioner is cooling normally, the air conditioning processing system believes that the current temperature of the indoor coil should be lower than the indoor coil temperature before the air conditioner is turned on, thereby judging that the amount of refrigerant in the air conditioner is normal. Therefore, n is set to ≤1 degree here.

[0026] The second one, see the attached Figure 3 As shown, when the air conditioner is running in heating mode, after recording the indoor coil temperature Tp0 before the compressor is turned on, the air conditioner is judged to be lack of fluorine according to the following conditions.

[0027] Case 1: When the indoor coil temperature Tp0 is less than or equal to the indoor coil cold wind protection temperature TpC (the second preset temperature), the compressor continuous working time is greater than the compressor continuous working time 2 Ct2 (the third preset time), and the current indoor coil temperature Tp is less than or equal to the indoor coil cold wind protection temperature TpC (the third preset temperature), it is judged that the air conditioner enters the fluorine deficiency protection; secondly, the outdoor unit is turned off and the indoor unit enters the cold wind protection mode.

[0028] Case 2: When the indoor coil temperature is greater than the indoor coil cold wind protection temperature TpC (the fourth preset temperature), the compressor continuous working time is greater than the compressor continuous working time 1 Ct1 (the fourth preset time), and the current temperature of the indoor coil is less than or equal to the indoor coil temperature Tp0 + n°C before the compressor is turned on (the fifth preset temperature), the air conditioner is judged to have entered the fluorine deficiency protection mode; secondly, the outdoor unit is turned off and the indoor unit maintains the current state of operation; when the compressor stops running for more than 3 minutes (the fifth preset time) and then starts again, the air conditioner is re-judged for fluorine deficiency protection; when the air conditioner judges that the number of fluorine deficiency protections meets 2 times (the second preset number), the outdoor unit is turned off and the indoor unit enters the cold wind protection mode.

[0029] It should be noted that during normal heating, the air conditioning processing system believes that the current temperature of the indoor coil should be greater than the indoor coil temperature before the air conditioner is turned on, thereby judging that the amount of refrigerant in the air conditioner is normal. Secondly, since the power of the air conditioner in heating mode is greater than that in cooling mode (generally, the temperature difference between indoor and outdoor environments is large, and the air conditioner requires a higher heat exchange power, that is, most users feel that the heating effect is worse than the cooling effect), therefore, n is set to ≥3 degrees (temperature compensation).

[0030] In addition, the above-mentioned anti-cold wind temperature is the set temperature for allowing air supply to be turned on during heating, which is set to 25 degrees. The human body temperature is 37 degrees, and the air conditioning cooling temperature is generally set to 26 degrees, which is comfortable and energy-saving in summer. Similarly, when heating in winter, the anti-cold wind temperature sets the indoor coil temperature to rise above 25 degrees before air supply is started to avoid the wind blowing out making people feel cold. For example: the room temperature in winter is generally below 15 degrees. When the air conditioner runs in heating mode and the compressor is running, if the air conditioner is allowed to supply air without setting the anti-cold wind mode, the air conditioner will send out wind with a temperature below 15 degrees, making the user feel cold; after setting the anti-cold wind mode, the indoor coil temperature of the air conditioner will rise to above 25 degrees before air supply is started, making the user feel comfortable and warm.

[0031] In the embodiment of the present invention, according to the following conditions, see the attached Figure 5 , Figure 6 As shown, the cold wind protection mode of the air conditioner is further explained: The first one is that when the current temperature Tp of the indoor coil is less than 30℃, the air guide strip opens upwards and is at the cold wind protection angle; When the indoor coil temperature rises from 25℃ to 30℃, the indoor fan blows a slight breeze.

[0032] When the indoor coil temperature drops from 30℃ to 25℃, the indoor fan blows low air.

[0033] The second type is that when the current temperature Tp of the indoor coil is greater than or equal to 30°C, the indoor fan blows low wind and exits the anti-cold wind mode. At this time, the air guide strip returns to the operating state before entering the anti-cold wind mode.

[0034] The third type is that when the current temperature Tp of the indoor coil is less than 25℃, the indoor fan on the air conditioner blows a slight breeze for 15s and then stops running; when the current temperature Tp of the indoor coil is greater than or equal to 25℃, the air conditioner exits the anti-cold wind mode, but the air guide strip remains at the anti-cold wind angle; until the current temperature Tp of the indoor coil is greater than or equal to 30℃, the air guide strip returns to the operating state before entering the anti-cold wind mode.

[0035] For further information, see Appendix Figure 1As shown, when the air conditioner is turned on, the processor starts the indoor motor and compressor. As the air conditioner runs, the coil temperature sensor on the indoor coil feeds back the coil temperature to the processor. The processor controls the indoor motor and compressor accordingly according to the above-mentioned fluorine deficiency judgment processing scheme, thereby determining whether the air conditioner enters fluorine deficiency protection.

[0036] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the present invention in any form. Any technician familiar with the art who, without departing from the scope of the technical solution of the present invention, uses the above disclosed technical content to make more possible changes and modifications to the technical solution of the present invention, or modifications are all equivalent embodiments of the present invention. Therefore, all equivalent and equivalent changes made according to the ideas of the present invention without departing from the content of the technical solution of the present invention should be covered within the protection scope of the present invention.

Claims

1. A method for judging and protecting air conditioner fluorine deficiency, characterized in that: When the air conditioner is running, the indoor coil temperature before the compressor is turned on is recorded, and according to the operating mode of the air conditioner, the current temperature of the indoor coil and the compressor operating time are detected to see whether they meet the preset conditions for entering the fluorine deficiency protection. If so, the air conditioner enters the fluorine deficiency protection. According to the operating mode of the air conditioner, it is determined whether to make a fluorine deficiency judgment on the air conditioner again, and if so, the air conditioner is made to make a fluorine deficiency judgment again. When the number of fluorine deficiency judgments of the air conditioner meets the preset number, it is determined whether to turn off the outdoor unit and keep the indoor unit running in the current state or enter the cold wind protection mode. If so, the outdoor unit is turned off and the indoor unit keeps running in the current state or enters the cold wind protection mode.

2. The method for judging and protecting air conditioner fluorine deficiency according to claim 1, characterized in that: When the air conditioner is running in cooling or dehumidification mode, the preset condition for judging the lack of fluorine is: recording the indoor coil temperature before the compressor is turned on, and when the compressor has been working continuously for more than a first preset time, the current temperature of the indoor coil is greater than or equal to the first preset temperature.

3. The method for judging and protecting air conditioner fluorine deficiency according to claim 2, characterized in that: After the air conditioner determines that it has entered the fluorine deficiency protection, the outdoor unit is turned off and the indoor unit maintains the current state of operation; when the compressor stops running for more than a second preset time and then starts again, the fluorine deficiency protection judgment is performed again.

4. The method for judging and protecting air conditioner fluorine deficiency according to claim 3, characterized in that: When the air conditioner determines that the number of times of fluorine deficiency protection meets the first preset number, the outdoor unit is turned off.

5. The method for judging and protecting air conditioner fluorine deficiency according to claim 1, characterized in that: When the air conditioner is in heating mode, the preset condition for judging the lack of fluorine is: after recording the indoor coil temperature before the compressor is turned on, the compressor is started; When the indoor coil temperature is less than or equal to the second preset temperature, after the compressor continuously works for a time greater than a third preset time, the current temperature of the indoor coil is less than or equal to the third preset temperature.

6. The method for judging and protecting air conditioner fluorine deficiency according to claim 5, characterized in that: When the air conditioner is judged to enter the fluorine deficiency protection mode, the outdoor unit is turned off and the indoor unit enters the cold wind protection mode.

7. The method for judging and protecting air conditioner fluorine deficiency according to claim 1, characterized in that: When the air conditioner is in heating mode, the preset condition for judging the lack of fluorine is: after recording the indoor coil temperature before the compressor is turned on, the compressor is started; When the indoor coil temperature is greater than a fourth preset temperature, after the compressor continuously works for a time greater than the fourth preset time, the current temperature of the indoor coil is less than or equal to a fifth preset temperature.

8. The method for judging and protecting air conditioner fluorine deficiency according to claim 7, characterized in that: After the air conditioner determines that it has entered the fluorine deficiency protection, the outdoor unit is turned off and the indoor unit maintains the current state of operation; when the compressor stops running for more than the fifth preset time and then starts again, the fluorine deficiency protection judgment is re-performed.

9. The method for judging and protecting air conditioner fluorine deficiency according to claim 8, characterized in that: When the air conditioner determines that the number of times of fluorine deficiency protection meets the second preset number, the outdoor unit is turned off and the indoor unit enters the cold wind protection mode.

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