Method for replacing refrigerant of air conditioner

Abstract

The invention relates to the technical field of air conditioning systems, in particular to a method for air conditioner refrigerant replacement, and aims to solve the problem of how to replace combustible refrigerants under the condition that a pipeline is not disassembled in an existing non-combustible refrigerant air conditioning system. In order to achieve the purpose, the method comprises the following steps that S11, the amount of refrigerants needed by a to-be-replaced air conditioning system is detected; s12, the quantity of refrigerants capable of being recycled is judged according to the outdoor unit; s13, whether the refrigerant can be directly recycled or not is judged according to the relation between the refrigerant recycling amount and the required refrigerant amount; if yes, entering the step S14; and S14, the refrigerant of the air conditioning system is directly replaced. In the process of replacing the refrigerant or after the refrigerant is replaced, if leakage occurs in the indoor unit, the refrigerant can be prevented from leaking through recycling of the outdoor unit, closing of the block valve or closing of the newly-added valve box or the stop valve, the combustible refrigerant can be prevented from continuously leaking, and it is guaranteed that safety accidents such as fire disasters or explosions cannot occur.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular provides a method for replacing refrigerant in an air conditioner. Background Art

[0002] Currently, most air conditioning systems on the market, such as air conditioning systems, use R410a refrigerant, which is non-flammable. With the trend of reducing global carbon emissions, new refrigerants are often flammable, such as R32 and R454B.

[0003] Environmental protection requirements necessitate replacing non-flammable refrigerants with flammable ones. However, for existing non-flammable refrigerant air conditioning systems in older buildings, removing the piping is nearly impossible. If the existing systems are retained, system reliability and user safety cannot be guaranteed in the event of a refrigerant leak.

[0004] Therefore, the relevant field urgently needs a method for replacing air-conditioning refrigerant to solve the above technical problems. Summary of the Invention

[0005] The present invention aims to solve the above technical problem, that is, to solve the problem of how to replace the flammable refrigerant in the existing non-flammable refrigerant air-conditioning system without removing the pipeline.

[0006] In a first aspect, the present invention provides a method for replacing refrigerant in an air conditioner, the method comprising the following steps:

[0007] S11. Detecting the amount of refrigerant required by the air-conditioning system to be replaced;

[0008] S12. Determine the amount of refrigerant that can be recovered based on the outdoor unit;

[0009] S13, judging whether the refrigerant can be directly recovered based on the relationship between the recovered refrigerant amount and the required refrigerant amount; if yes, proceeding to step S14;

[0010] S14. Directly replace the refrigerant of the air-conditioning system.

[0011] In a specific embodiment of the above-mentioned method for replacing air conditioning refrigerant, the amount of recovered refrigerant can be directly determined according to the model of the external unit or calculated according to the size of the heat exchanger, the gas-liquid separator and the internal volume of the container that can accommodate the refrigerant in the pipeline.

[0012] In a specific embodiment of the above method for replacing refrigerant in an air conditioner, the method further includes:

[0013] S15. If the answer to step S13 is no, determine whether there is a valve box or a gas-liquid side shut-off valve in the air conditioning system that cuts off the refrigerant; if yes, proceed to step S14; if no, proceed to step S16;

[0014] S16, installing a valve box or a gas-liquid side shut-off valve capable of shutting off the gas-liquid side in the air conditioning system, and then proceeding to step S17;

[0015] S17: Replace the refrigerant in the air-conditioning system.

[0016] In a specific embodiment of the above-mentioned method for replacing refrigerant in an air conditioner, “determining whether the refrigerant can be directly recovered based on the relationship between the amount of recovered refrigerant and the required amount of refrigerant” includes:

[0017] Whether the ratio of the amount of recovered refrigerant to the amount of required refrigerant is greater than a first preset threshold, and / or

[0018] Whether the difference between the required refrigerant amount and the recovered refrigerant amount is less than or equal to the room safety threshold.

[0019] In a second aspect, the present invention provides a method for replacing refrigerant in an air conditioner, the method comprising the following steps:

[0020] S21. Determine whether there is a shutoff valve on the gas and liquid sides of the replacement air conditioning system. If both sides have shutoff valves, proceed to step S22; if only one side has shutoff valves, proceed to step S23; if not, proceed to step S25;

[0021] S22. Directly replace the refrigerant of the air-conditioning system;

[0022] S23, installing a shutoff valve on the other side of the gas-liquid side or installing a valve box or a gas-liquid shutoff valve capable of shutting off the gas-liquid side in the air conditioning system, and then proceeding to step S24;

[0023] S24, replacing the refrigerant of the air conditioning system;

[0024] S25. Install a valve box or a gas-liquid side stop valve capable of shutting off the gas-liquid side in the air-conditioning system, and then proceed to step S24.

[0025] In a specific embodiment of the above-mentioned method for replacing refrigerant in an air conditioner, the valve box or the gas-liquid side shut-off valve is installed on the indoor unit side and / or the outdoor unit side;

[0026] Among them, it is preferably installed on the indoor unit side.

[0027] In a specific embodiment of the above-mentioned method for replacing refrigerant in an air conditioner, a refrigerant detector is additionally provided on the indoor unit side and / or the outdoor unit side.

[0028] In a specific embodiment of the above-mentioned method for replacing refrigerant in an air conditioner, a ventilation device is added to the indoor unit side, and when the refrigerant leaks, the refrigerant leaked from the indoor unit side is discharged into the room through the ventilation device.

[0029] In a specific embodiment of the above-mentioned method for replacing refrigerant in an air conditioner, the shut-off valve is a stop valve and / or an electronic expansion valve.

[0030] In a specific embodiment of the above method for replacing refrigerant in an air conditioner, the method further includes:

[0031] Before or after replacing the refrigerant of the air-conditioning system, the number of outdoor units corresponding to indoor units of the air-conditioning system is determined according to the required refrigerant amount and the system safety threshold, so as to increase the outdoor units or reduce the indoor units.

[0032] In a specific embodiment of the above method for replacing refrigerant in an air conditioner, the method further includes:

[0033] After replacing the refrigerant in the air conditioning system, update the program of the indoor unit and / or outdoor unit.

[0034] In a specific embodiment of the above-mentioned method for replacing air conditioning refrigerant, in the case of directly replacing the refrigerant of the air conditioning system, the program for updating the outdoor unit is configured such that if refrigerant leakage occurs on the indoor unit side, the outdoor unit recovers the refrigerant.

[0035] In the specific embodiment of the above-mentioned method for replacing air conditioning refrigerant, in the case of directly replacing the refrigerant of the air conditioning system, and when there is a valve box or a gas-liquid side stop valve on the outdoor unit side to cut off the refrigerant;

[0036] The program for updating the outdoor unit is configured to close the valve box or the stop valve if a refrigerant leak occurs on the indoor unit side.

[0037] In the specific embodiment of the above-mentioned method for replacing air conditioning refrigerant, in the case of directly replacing the refrigerant of the air conditioning system, and when there is a valve box or a gas-liquid side stop valve on the inner unit side to cut off the refrigerant;

[0038] The program for updating the indoor unit is configured such that if a refrigerant leak occurs on the indoor unit side, the valve box or the shut-off valve corresponding to the indoor unit where the leak occurs is closed.

[0039] In the specific embodiment of the above-mentioned method for replacing refrigerant in an air conditioner, when a valve box or a gas-liquid side stop valve for cutting off the refrigerant is added on the side of the external unit;

[0040] The program for updating the outdoor unit is configured to close the valve box or the stop valve if a refrigerant leak occurs on the indoor unit side.

[0041] In the specific embodiment of the above-mentioned method for replacing refrigerant in an air conditioner, when a valve box or a gas-liquid side stop valve for cutting off the refrigerant is added on the inner unit side;

[0042] The program for updating the indoor unit is configured such that if a refrigerant leak occurs on the indoor unit side, the valve box or the shut-off valve corresponding to the indoor unit where the leak occurs is closed.

[0043] In a specific embodiment of the above-mentioned method for replacing air conditioning refrigerant, in the case of directly replacing the refrigerant of the air conditioning system, the program for updating the outdoor unit is configured as follows: if a refrigerant leak occurs on the indoor unit side, the outdoor unit recovers the refrigerant and controls the ventilation device on the indoor unit side where the leak occurs to ventilate.

[0044] In the specific embodiment of the above-mentioned method for replacing air conditioning refrigerant, in the case of directly replacing the refrigerant of the air conditioning system, and when there is a valve box or a gas-liquid side stop valve on the outdoor unit side to cut off the refrigerant;

[0045] The program for updating the outdoor unit is configured such that if refrigerant leakage occurs on the indoor unit side, the valve box or the stop valve is closed, and the ventilation device on the indoor unit side where the leakage occurs is controlled to perform ventilation.

[0046] In the specific embodiment of the above-mentioned method for replacing air conditioning refrigerant, in the case of directly replacing the refrigerant of the air conditioning system, and when there is a valve box or a gas-liquid side stop valve on the inner unit side to cut off the refrigerant;

[0047] The program for updating the indoor unit is configured as follows: if refrigerant leakage occurs on the indoor unit side, the valve box or the stop valve corresponding to the indoor unit where the leakage occurs is closed, and the ventilation device on the indoor unit side where the leakage occurs is controlled to perform ventilation.

[0048] In the specific embodiment of the above-mentioned method for replacing refrigerant in an air conditioner, when a valve box or a gas-liquid side stop valve for cutting off the refrigerant is added on the side of the external unit;

[0049] The program for updating the outdoor unit is configured such that if refrigerant leakage occurs on the indoor unit side, the valve box or the stop valve is closed, and the ventilation device on the indoor unit side where the leakage occurs is controlled to perform ventilation.

[0050] In the specific embodiment of the above-mentioned method for replacing refrigerant in an air conditioner, when a valve box or a gas-liquid side stop valve for cutting off the refrigerant is added on the inner unit side;

[0051] The program for updating the indoor unit is configured as follows: if refrigerant leakage occurs on the indoor unit side, the valve box or the stop valve corresponding to the indoor unit where the leakage occurs is closed, and the ventilation device on the indoor unit side where the leakage occurs is controlled to perform ventilation.

[0052] In the specific embodiment of the above-mentioned method for replacing refrigerant in an air conditioner, in the case of directly replacing the refrigerant in the air conditioning system and when there is a shut-off valve on the outdoor unit side;

[0053] The program for updating the outdoor unit is configured to close the shutoff valve if refrigerant leakage occurs on the indoor unit side.

[0054] In the specific embodiment of the above-mentioned method for replacing refrigerant in an air conditioner, in the case of directly replacing the refrigerant in the air conditioning system, and when the shut-off valve is present on the inner unit side;

[0055] The program for updating the indoor unit is configured such that if a refrigerant leak occurs on the indoor unit side, the shutoff valve corresponding to the indoor unit where the leak occurs is closed.

[0056] In the specific embodiment of the above-mentioned method for replacing refrigerant in an air conditioner, when a shutoff valve is provided on one side of the gas-liquid side of the outdoor unit and a shutoff valve is provided on the other side;

[0057] The program for updating the outdoor unit is configured to close the shutoff valve if refrigerant leakage occurs on the indoor unit side.

[0058] In the specific embodiment of the above-mentioned method for replacing refrigerant in an air conditioner, when a shutoff valve is provided on one side of the gas-liquid side of the indoor unit and a shutoff valve is provided on the other side;

[0059] The program for updating the outdoor unit is configured such that if a refrigerant leak occurs on the indoor unit side, the shutoff valve corresponding to the indoor unit where the leak occurs is closed.

[0060] In the specific embodiment of the above-mentioned method for replacing refrigerant in an air conditioner, when a valve box or a gas-liquid side stop valve for cutting off the refrigerant is added on the side of the external unit;

[0061] The program for updating the outdoor unit is configured to close the valve box or the stop valve if a refrigerant leak occurs on the indoor unit side.

[0062] In the specific embodiment of the above-mentioned method for replacing refrigerant in an air conditioner, when a valve box or a gas-liquid side stop valve for cutting off the refrigerant is added on the inner unit side;

[0063] The program for updating the indoor unit is configured such that if a refrigerant leak occurs on the indoor unit side, the valve box or the shut-off valve corresponding to the indoor unit where the leak occurs is closed.

[0064] In the specific embodiment of the above-mentioned method for replacing refrigerant in an air conditioner, in the case of directly replacing the refrigerant in the air conditioning system and when there is a shut-off valve on the outdoor unit side;

[0065] The program for updating the outdoor unit is configured such that if refrigerant leakage occurs on the indoor unit side, the shut-off valve is closed, and the ventilation device on the indoor unit side where the leakage occurs is controlled to perform ventilation.

[0066] In the specific embodiment of the above-mentioned method for replacing refrigerant in an air conditioner, in the case of directly replacing the refrigerant in the air conditioning system, and when the shut-off valve is present on the inner unit side;

[0067] The program for updating the indoor unit is configured such that if refrigerant leakage occurs on the indoor unit side, the shut-off valve corresponding to the indoor unit where the leakage occurs is closed, and the ventilation device on the indoor unit side where the leakage occurs is controlled to perform ventilation.

[0068] In the specific embodiment of the above-mentioned method for replacing refrigerant in an air conditioner, when a shutoff valve is provided on one side of the gas-liquid side of the outdoor unit and a shutoff valve is provided on the other side;

[0069] The program for updating the outdoor unit is configured such that if refrigerant leakage occurs on the indoor unit side, the shut-off valve is closed, and the ventilation device on the indoor unit side where the leakage occurs is controlled to perform ventilation.

[0070] In the specific embodiment of the above-mentioned method for replacing refrigerant in an air conditioner, when a shutoff valve is provided on one side of the gas-liquid side of the indoor unit and a shutoff valve is provided on the other side;

[0071] The program for updating the outdoor unit is configured such that if refrigerant leakage occurs on the indoor unit side, the shut-off valve corresponding to the indoor unit where the leakage occurs is closed, and the ventilation device on the indoor unit side where the leakage occurs is controlled to perform ventilation.

[0072] In the specific embodiment of the above-mentioned method for replacing refrigerant in an air conditioner, when a valve box or a gas-liquid side stop valve for cutting off the refrigerant is added on the side of the external unit;

[0073] The program for updating the outdoor unit is configured such that if refrigerant leakage occurs on the indoor unit side, the valve box or the stop valve is closed, and the ventilation device on the indoor unit side where the leakage occurs is controlled to perform ventilation.

[0074] In the specific embodiment of the above-mentioned method for replacing refrigerant in an air conditioner, when a valve box or a gas-liquid side stop valve for cutting off the refrigerant is added on the inner unit side;

[0075] The program for updating the indoor unit is configured as follows: if refrigerant leakage occurs on the indoor unit side, the valve box or the stop valve corresponding to the indoor unit where the leakage occurs is closed, and the ventilation device on the indoor unit side where the leakage occurs is controlled to perform ventilation.

[0076] When the above technical solution is adopted, during or after the refrigerant is replaced, if the indoor unit of the air-conditioning system of the present invention leaks, the refrigerant can be recovered by the outdoor unit, the shut-off valve can be closed, or the newly installed valve box or stop valve can be closed to prevent the refrigerant from leaking. This can prevent the flammable refrigerant from continuing to leak, thereby ensuring that safety accidents such as fire or explosion will not occur.

[0077] The number of outdoor units corresponding to the indoor units is determined based on the system's refrigerant volume and the system's safety threshold. This ensures that the system's refrigerant volume meets requirements while also ensuring that the outdoor units can supply the cooling or heating needs of all indoor units.

[0078] When there is installation space on the indoor unit side, installing a stop valve on the indoor unit side can quickly cut off the refrigerant leakage of the indoor unit, reduce the amount of leaked refrigerant, and ensure to the greatest extent possible that safety accidents such as fire or explosion will not occur.

[0079] When there is no installation space on the inner unit side, a stop valve is installed on the outer unit side. When the refrigerant leaks, closing the stop valve can also prevent the refrigerant from leaking further, thus ensuring that safety accidents such as fire or explosion will not occur to the greatest extent possible.

[0080] This system adjustment method can be used to conduct specific analysis on heat recovery systems and heat pump systems, and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0081] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

[0082] Figure 1 This is a flow chart of a method for replacing refrigerant in an air conditioner provided in the first embodiment of the present invention;

[0083] Figure 2 This is a flow chart of a method for replacing refrigerant in an air conditioner provided in a second embodiment of the present invention;

[0084] Figure 3 This is a schematic diagram of the structure of the heat recovery system provided in the third embodiment of the present invention (the outdoor unit can recover the refrigerant, and a shut-off valve is installed on the outdoor unit side);

[0085] Figure 4 This is a schematic diagram of the structure of the heat pump system provided in the third embodiment of the present invention (the outdoor unit can recycle the refrigerant and a shut-off valve is installed on the outdoor unit side);

[0086] Figure 5 This is a schematic diagram of the structure of the heat pump system provided in the fourth embodiment of the present invention (the outdoor unit can recycle the refrigerant, and a shut-off valve needs to be installed on the outdoor unit side);

[0087] Figure 6 This is a structural diagram of the heat recovery system provided in Example 5 of the present invention (the outdoor unit can recover the refrigerant, and a shut-off valve needs to be installed on the outdoor unit side);

[0088] Figure 7 This is a schematic diagram of the structure of the heat recovery system provided in Example 6 of the present invention (the outdoor unit cannot recycle the refrigerant, and there is installation space on the indoor unit side);

[0089] Figure 8 This is a schematic diagram of the structure of the heat recovery system provided in Example 7 of the present invention (the outdoor unit cannot recycle the refrigerant, and there is installation space on the indoor unit side);

[0090] Figure 9This is a schematic diagram of the structure of the heat pump system provided in Example 8 of the present invention (the outdoor unit cannot recycle the refrigerant, and there is installation space on the indoor unit side);

[0091] Figure 10 This is a schematic diagram of the structure of the heat recovery system provided in Example 9 of the present invention (the outdoor unit cannot recycle refrigerant, and there is no installation space on the indoor unit side);

[0092] Figure 11 This is a schematic diagram of the structure of the heat recovery system provided in the tenth embodiment of the present invention (the outdoor unit cannot recycle the refrigerant, and there is no installation space on the indoor unit side);

[0093] Figure 12 This is a schematic diagram of the structure of the heat pump system provided in the eleventh embodiment of the present invention (the outdoor unit cannot recycle the refrigerant, and there is no installation space on the indoor unit side);

[0094] Figure 13 This is a schematic diagram of the structure of the heat pump system provided by the invention of the twelfth embodiment (the outdoor unit cannot recycle the refrigerant, and there is no installation space on the indoor unit side);

[0095] Figure 14 The present invention provides a detailed flowchart of the method for replacing refrigerant in an air conditioner.

[0096] List of reference numerals:

[0097] 1b, indoor unit; 1c, indoor unit electronic expansion valve; 1d, indoor unit heat exchanger; 1f, low-pressure gas pipe valve; 1g, high-pressure gas pipe valve; 4, compressor; 5, oil separator; 6, gas-liquid separator; 7, outdoor unit heat exchanger; 7a, first four-way valve; 7b, defrost sensor; 7c, outdoor unit electronic expansion valve; 8a, second four-way valve; 9, outdoor fan; 10, third four-way valve; 11, shut-off valve; 11a, liquid pipe; 11b, main line; 12a, low-pressure gas pipe; 13a, high-pressure gas pipe; 14, outdoor unit. DETAILED DESCRIPTION

[0098] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0099] It should be noted that in the description of the present invention, terms such as "upper," "lower," "left," "right," "inner," and "outer" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. These terms are used solely for ease of description and are not intended to indicate or imply that the device or component described must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0100] Furthermore, it should be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "installed," "disposed," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0101] To address the issue of replacing flammable refrigerants in existing non-flammable refrigerant air conditioning systems without removing piping, the present invention discloses a method for replacing refrigerants in air conditioning. The air conditioning system includes an outdoor unit 14 and multiple indoor units 1b arranged in parallel. The air conditioning system primarily comprises a heat recovery system and a heat pump system.

[0102] If the air conditioning system is a heat recovery system, the outdoor unit 14 is connected to a liquid pipe 11a, a high-pressure gas pipe 13a, and a low-pressure gas pipe 12a. The first side of the indoor unit 1b is connected to the liquid pipe 11a via a liquid branch, and the second side of the indoor unit 1b is connected to the low-pressure gas pipe 12a via a low-pressure branch. A low-pressure gas pipe 12a valve 1f is provided on the low-pressure gas pipe 12a. The second side of the indoor unit 1b is connected to the high-pressure gas pipe 13a via a high-pressure branch. A high-pressure gas pipe 13a valve 1g is provided on the high-pressure branch. An electronic expansion valve for the indoor unit 1b is provided on the side of the liquid branch near the heat exchanger of the indoor unit 1b. The outdoor unit 14 includes multiple outdoor unit 14 heat exchangers 7, each of which is connected to the liquid pipe 11a via a liquid branch. An electronic expansion valve 7c is provided on the liquid branch near the heat exchanger of the outdoor unit 14.

[0103] If the air conditioning system is a heat pump system, the outdoor unit 14 is connected to two main circuits 11b, and the indoor unit 1b is connected to these main circuits 11b via two branch circuits. Specifically, one side of the indoor unit 1b is connected to one main circuit 11b via a branch circuit, and the other side of the indoor unit 1b is connected to the other main circuit 11b via another branch circuit. An electronic expansion valve for the indoor unit 1b is installed on the branch circuit through which the liquid refrigerant flows. An electronic expansion valve 7c for the outdoor unit 14 is installed on the side of the main circuit 11b through which the liquid refrigerant flows, near the heat exchanger 7 of the outdoor unit 14.

[0104] Example 1

[0105] This embodiment discloses a method for replacing refrigerant in an air conditioner. Figure 1 As shown, the method for replacing refrigerant in an air conditioner mainly includes the following steps:

[0106] S11. Detecting the amount of refrigerant required by the air-conditioning system to be replaced;

[0107] S12, judging the amount of refrigerant that can be recovered based on the outdoor unit 14;

[0108] S13. Determine whether the refrigerant can be directly recovered based on the relationship between the amount of recovered refrigerant and the required amount of refrigerant; if yes, proceed to step S14;

[0109] S14: Directly replace the refrigerant in the air-conditioning system and update the programs of the indoor unit 1b and the outdoor unit 14.

[0110] The method for replacing refrigerant in an air conditioner further comprises the following steps:

[0111] S15: If the answer is no in step S13, determine whether there is a valve box or a gas-liquid side stop valve in the air conditioning system that cuts off the refrigerant; if yes, proceed to step S14; if no, proceed to step S16;

[0112] S16: Install a valve box or a gas-liquid shut-off valve in the air conditioning system that can shut off the gas-liquid side, and then proceed to step S17;

[0113] S17: Replace the refrigerant in the air-conditioning system and update the programs of the indoor unit 1b and the outdoor unit 14.

[0114] In step S12, the amount of recovered refrigerant can be directly determined based on the model of the external unit 14 or calculated based on the size of the heat exchanger, the gas-liquid separator 6, and the internal volume of the container that can accommodate the refrigerant in the pipeline.

[0115] In step S13, "determining whether refrigerant can be directly recovered based on the relationship between the recovered refrigerant amount and the required refrigerant amount" includes determining whether the ratio of the recovered refrigerant amount to the required refrigerant amount is greater than a first preset threshold, and / or whether the difference between the required refrigerant amount and the recovered refrigerant amount is less than or equal to a room safety threshold. The first preset threshold can be 70%, 60%, or 75%, etc., and can be set based on actual site conditions. The room safety threshold is specifically related to room size, actual space, and ventilation conditions.

[0116] The valve box or gas-liquid shutoff valve is installed on the indoor unit 1b side and / or the outdoor unit 14 side; preferably, it is installed on the indoor unit 1b side. Specifically, if there is space for installation on the indoor unit 1b side, the valve box or shutoff valve can be installed on the indoor unit 1b side. To ensure system reliability, the valve box or gas-liquid shutoff valve can be installed on both the indoor unit 1b side and the outdoor unit 14 side.

[0117] A refrigerant detector is provided on the side of the indoor unit 1b and / or the side of the outdoor unit 14 to detect whether a refrigerant leak occurs and to send the detected information to the corresponding outdoor unit 14 or indoor unit 1b so that corresponding measures can be taken.

[0118] A ventilation device is added to the indoor unit 1b. In the event of a refrigerant leak, the leaked refrigerant on the indoor unit 1b side is discharged through the ventilation device. Specifically, if a ventilation device is already present on the indoor unit 1b side, the existing ventilation device is utilized. If no ventilation device exists and there is space for installation, a ventilation device is installed on the indoor unit 1b side.

[0119] The method for replacing refrigerant in air conditioners also includes step S10: before or after replacing the refrigerant in the air conditioning system, step S10 is performed; S10, based on the required amount of refrigerant and the system safety threshold, determines the number of outdoor units 14 corresponding to the indoor units 1b of the air conditioning system to increase the outdoor units 14 or reduce the indoor units 1b. Preferably, this step is performed before replacing the refrigerant in the air conditioning system, specifically, step S10 is performed before step S11. Performing step S10 before performing step S11 can reduce the number of judgments, and after one judgment, the system can complete the preparations for replacing the flammable refrigerant. After replacing the refrigerant, step S10 is performed, and after determining that the number of outdoor units 14 and indoor units 1b does not match, and adding a new outdoor unit 14, step S11 and subsequent steps need to be performed again.

[0120] Due to varying safety regulations and industry regulations across countries and regions, safety limits for flammable refrigerants, or system safety thresholds, are required. The refrigerant volume within a single air conditioning system must not exceed the system safety threshold. However, in traditional air conditioning systems, a single outdoor unit (14) may operate multiple outdoor units (14). This can lead to the volume exceeding the system safety threshold after replacing the flammable refrigerant. In this case, the volume of flammable refrigerant needs to be reduced, but this reduction is insufficient to meet the needs of multiple indoor units (1b). Therefore, either the number of indoor units (1b) needs to be reduced or the number of outdoor units (14) needs to be increased.

[0121] "Determining the number of indoor units 1b corresponding to each outdoor unit 14 based on the refrigerant volume and system safety threshold of the air conditioning system" specifically includes: if the refrigerant volume exceeds the system safety threshold, the indoor units 1b are grouped and a new outdoor unit 14 is added. Specifically, the number of indoor units 1b corresponding to each outdoor unit 14 is adjusted until the refrigerant volume no longer exceeds the system safety threshold. Because indoor units 1b are configured according to the building and generally cannot be arbitrarily reduced, the indoor units 1b are grouped and a new outdoor unit 14 is added.

[0122] Regarding the provision of "determining the number of indoor units 1b corresponding to the outdoor units 14 based on the refrigerant quantity of the air-conditioning system and the system safety threshold," it should be noted that while this embodiment adds a new outdoor unit 14 when the refrigerant quantity exceeds the system safety threshold, this is not a limitation of the present invention. Without departing from the principles of the present invention, in other embodiments, if the refrigerant quantity exceeds the system safety threshold, the number of indoor units 1b corresponding to the outdoor units 14 may be reduced. Specifically, the number of indoor units 1b that are about to be discontinued or are unimportant may be reduced until the refrigerant quantity no longer exceeds the system safety threshold. Such arrangements do not deviate from the basic principles of the present invention and therefore fall within the scope of protection of the present invention.

[0123] The method for replacing refrigerant in an air conditioner further includes the following steps: after replacing the refrigerant in the air conditioning system, updating the program of the indoor unit 1b and / or the outdoor unit 14. The updated program may specifically include controlling the indoor unit 1b and the outdoor unit 14 to take corresponding safety measures when the refrigerant detector detects a leak in the indoor unit 1b or the outdoor unit 14.

[0124] In a specific embodiment of the present invention, when the outdoor unit 14 is capable of recovering refrigerant, that is, when the outdoor unit 14 is capable of directly recovering refrigerant, the updated program of the outdoor unit 14 is configured such that: during or after the refrigerant replacement process, if a refrigerant leak occurs on the indoor unit 1b side, the outdoor unit 14 is controlled to recover the refrigerant. If a ventilation device is present on the indoor unit 1b side (specifically, it may be a pre-existing ventilation device or a newly installed ventilation device); during or after the refrigerant replacement process, if a refrigerant leak occurs on the indoor unit 1b side, the outdoor unit 14 is controlled to recover the refrigerant, and the ventilation device on the indoor unit 1b side where the leak occurs is controlled to ventilate, so that the refrigerant leaking from the indoor unit 1b is discharged, thereby avoiding safety accidents such as fire or explosion.

[0125] In a specific embodiment of the present invention, when the outdoor unit 14 is unable to recycle refrigerant and a valve box or gas-liquid shut-off valve for shutting off refrigerant exists on the outdoor unit 14 side; that is, when the outdoor unit 14 is unable to recycle refrigerant and a valve box or gas-liquid shut-off valve for shutting off refrigerant exists on the outdoor unit 14 side, the air conditioning system can directly replace refrigerant. The updated program of the outdoor unit 14 is configured to: during or after the refrigerant replacement process, if refrigerant leakage occurs on the indoor unit 1b side, the valve box or shut-off valve is closed. If a ventilation device is present on the indoor unit 1b side (specifically, it can be a pre-existing ventilation device or a newly installed ventilation device); during or after the refrigerant replacement process, if refrigerant leakage occurs on the indoor unit 1b side, the valve box or shut-off valve is closed, and the ventilation device on the side of the indoor unit 1b where the leakage occurs is controlled to ventilate; so that the refrigerant leaked from the indoor unit 1b is discharged, thereby avoiding safety accidents such as fire or explosion.

[0126] In a specific embodiment of the present invention, when the outdoor unit 14 is unable to recover refrigerant and a valve box or gas-liquid shutoff valve is present on the indoor unit 1b side to shut off the refrigerant; that is, when the outdoor unit 14 is unable to recover refrigerant and a valve box or gas-liquid shutoff valve is present on the indoor unit 1b side to shut off the refrigerant, the air conditioning system can be directly refrigerant replaced. The program for updating the indoor unit 1b is configured such that, during or after refrigerant replacement, if a refrigerant leak occurs on the indoor unit 1b side, the valve box or shutoff valve corresponding to the leaking indoor unit 1b is closed, and the ventilation device on the leaking indoor unit 1b side is controlled to ventilate. If a refrigerant leak occurs on the indoor unit 1b side, the valve box or shutoff valve is closed. If there is a ventilation device on the indoor unit 1b side (specifically, it can be a previously existing ventilation device or a newly installed ventilation device); during the process of replacing the refrigerant or after replacing the refrigerant, if refrigerant leakage occurs on the indoor unit 1b side, close the valve box or stop valve corresponding to the leaking indoor unit 1b, and control the ventilation device on the leaking indoor unit 1b side to ventilate; the refrigerant leaked from the indoor unit 1b is discharged to avoid safety accidents such as fire or explosion.

[0127] In a specific embodiment of the present invention, when the outdoor unit 14 is unable to recycle refrigerant and a valve box or gas-liquid shutoff valve is added to the outdoor unit 14; that is, when the outdoor unit 14 is unable to recycle refrigerant, a valve box or gas-liquid shutoff valve does not exist in the air conditioning system, and there is no space for installation on the indoor unit 1b side, a valve box or gas-liquid shutoff valve is added to the outdoor unit 14. The updated program of the outdoor unit 14 is configured to: during or after refrigerant replacement, if refrigerant leakage occurs on the indoor unit 1b side, the valve box or shutoff valve is closed. If a ventilation device is present on the indoor unit 1b side (specifically, it can be a pre-existing ventilation device or a newly installed ventilation device), if refrigerant leakage occurs on the indoor unit 1b side during or after refrigerant replacement, the valve box or shutoff valve on the outdoor unit 14 side is closed, and the ventilation device on the indoor unit 1b side where the leakage occurs is controlled to ventilate. This allows the refrigerant leaking from the indoor unit 1b to be discharged, preventing safety accidents such as fire or explosion.

[0128] In a specific embodiment of the present invention, when the outdoor unit 14 is unable to recycle refrigerant and a valve box or gas-liquid shut-off valve for shutting off refrigerant is added to the indoor unit 1b; that is, when the outdoor unit 14 is unable to recycle refrigerant, there is no valve box or gas-liquid shut-off valve for shutting off refrigerant in the air-conditioning system, and there is installation space on the indoor unit 1b, a valve box or gas-liquid shut-off valve for shutting off refrigerant is newly added to the indoor unit 1b. The program for updating the indoor unit 1b is configured such that, during or after refrigerant replacement, if refrigerant leakage occurs on the indoor unit 1b side, the valve box or shut-off valve corresponding to the indoor unit 1b where the leakage occurs is closed, and the ventilation device on the indoor unit 1b side where the leakage occurs is controlled to ventilate. If there is a ventilation device on the indoor unit 1b side (specifically, it can be a previously existing ventilation device or a newly installed ventilation device); during the process of replacing the refrigerant or after replacing the refrigerant, if refrigerant leakage occurs on the indoor unit 1b side, close the valve box or stop valve corresponding to the leaking indoor unit 1b, and control the ventilation device on the leaking indoor unit 1b side to ventilate; the refrigerant leaked from the indoor unit 1b is discharged to avoid safety accidents such as fire or explosion.

[0129] Example 2

[0130] This embodiment discloses a method for replacing refrigerant in an air conditioner, which mainly includes the following steps:

[0131] S21, determine whether there is a shutoff valve 11 on the gas and liquid sides of the replacement air conditioning system. If both sides exist, proceed to step S22; if only one side exists, proceed to step S23; if not, proceed to step S25;

[0132] S22, directly replace the refrigerant of the air conditioning system and update the programs of the indoor unit 1b and the outdoor unit 14;

[0133] S23, install a shut-off valve 11 on the other side of the gas-liquid side or install a valve box or a gas-liquid side shut-off valve that can achieve gas-liquid side shut-off in the air conditioning system, and then proceed to step S24;

[0134] S24, replace the refrigerant in the air conditioning system and update the programs of the indoor unit 1b and the outdoor unit 14;

[0135] S25. Install a valve box or a gas-liquid side stop valve that can achieve gas-liquid side shutoff in the air-conditioning system, and then proceed to step S24.

[0136] The valve box or gas-liquid shutoff valve is installed on the indoor unit 1b side and / or the outdoor unit 14 side; preferably, it is installed on the indoor unit 1b side. Specifically, if there is space for installation on the indoor unit 1b side, the valve box or shutoff valve can be installed on the indoor unit 1b side. To ensure system reliability, the valve box or gas-liquid shutoff valve can be installed on both the indoor unit 1b side and the outdoor unit 14 side.

[0137] A refrigerant detector is provided on the side of the indoor unit 1b and / or the side of the outdoor unit 14 to detect whether a refrigerant leak occurs and to send the detected information to the corresponding outdoor unit 14 or indoor unit 1b so that corresponding measures can be taken.

[0138] A ventilation device is added to the indoor unit 1b. In the event of a refrigerant leak, the leaked refrigerant on the indoor unit 1b side is discharged through the ventilation device. Specifically, if a ventilation device is already present on the indoor unit 1b side, the existing ventilation device is utilized. If no ventilation device exists and there is space for installation, a ventilation device is installed on the indoor unit 1b side.

[0139] The shutoff valve 11 is a stop valve and / or an electronic expansion valve. Specifically, if the air conditioning system is a heat recovery system, the shutoff valve 11 on the indoor unit 1b side is the low-pressure gas pipe 12a valve 1f, the high-pressure gas pipe 13a valve 1g, and the indoor unit 1b electronic expansion valve; the shutoff valve 11 on the outdoor unit 14 side is the outdoor unit 14 electronic expansion valve 7c. If the air conditioning system is a heat pump system, the shutoff valve 11 on the indoor unit 1b side is the indoor unit 1b electronic expansion valve, and the shutoff valve 11 on the outdoor unit 14 side is the outdoor unit 14 electronic expansion valve 7c. Since electronic expansion valves are primarily used to control superheat and subcooling, although they can also achieve a shutoff function, they are likely to be damaged by a large impact when used to shut off the refrigerant. Therefore, a shutoff valve or valve box is generally connected in series with the electronic expansion valve to achieve shutoff or flow, ensuring that the electronic expansion valve is not damaged.

[0140] The method for replacing refrigerant in air conditioners also includes step S20: before or after replacing the refrigerant in the air conditioning system, step S20 is performed; S20, based on the required amount of refrigerant and the system safety threshold, determines the number of outdoor units 14 corresponding to the indoor units 1b of the air conditioning system to increase the outdoor units 14 or reduce the indoor units 1b. Preferably, this step is performed before replacing the refrigerant in the air conditioning system, specifically, step S20 is performed before step S21. Performing step S20 before performing step S21 can reduce the number of judgments, and after one judgment, the system can complete the preparations for replacing the flammable refrigerant. After replacing the refrigerant, step S20 is performed, and after determining that the number of outdoor units 14 and indoor units 1b does not match, and after adding a new outdoor unit 14, step S21 and subsequent steps need to be performed again.

[0141] Due to varying safety regulations and industry regulations across countries and regions, safety limits for flammable refrigerants, or system safety thresholds, are required. The refrigerant volume within a single air conditioning system must not exceed the system safety threshold. However, in traditional air conditioning systems, a single outdoor unit (14) may operate multiple outdoor units (14). This can lead to the volume exceeding the system safety threshold after replacing the flammable refrigerant. In this case, the volume of flammable refrigerant needs to be reduced, but this reduction is insufficient to meet the needs of multiple indoor units (1b). Therefore, either the number of indoor units (1b) needs to be reduced or the number of outdoor units (14) needs to be increased.

[0142] "Determining the number of indoor units 1b corresponding to each outdoor unit 14 based on the refrigerant volume and system safety threshold of the air conditioning system" specifically includes: if the refrigerant volume exceeds the system safety threshold, the indoor units 1b are grouped and a new outdoor unit 14 is added. Specifically, the number of indoor units 1b corresponding to each outdoor unit 14 is adjusted until the refrigerant volume no longer exceeds the system safety threshold. Because indoor units 1b are configured according to the building and generally cannot be arbitrarily reduced, the indoor units 1b are grouped and a new outdoor unit 14 is added.

[0143] Regarding the provision of "determining the number of indoor units 1b corresponding to the outdoor units 14 based on the refrigerant quantity of the air-conditioning system and the system safety threshold," it should be noted that while this embodiment adds a new outdoor unit 14 when the refrigerant quantity exceeds the system safety threshold, this is not a limitation of the present invention. Without departing from the principles of the present invention, in other embodiments, if the refrigerant quantity exceeds the system safety threshold, the number of indoor units 1b corresponding to the outdoor units 14 may be reduced. Specifically, the number of indoor units 1b that are about to be discontinued or are unimportant may be reduced until the refrigerant quantity no longer exceeds the system safety threshold. Such arrangements do not deviate from the basic principles of the present invention and therefore fall within the scope of protection of the present invention.

[0144] The method for replacing air conditioning refrigerant further includes the following steps: after replacing the refrigerant in the air conditioning system, updating the program of the indoor unit 1b and / or the outdoor unit 14.

[0145] In a specific embodiment of the present invention, if a shutoff valve 11 is present on the outdoor unit 14, the updated program of the outdoor unit 14 is configured to close the shutoff valve 11 if a refrigerant leak occurs on the indoor unit 1b during or after refrigerant replacement. If a ventilation device (specifically, a pre-existing ventilation device or a newly installed ventilation device) is present on the indoor unit 1b, if a refrigerant leak occurs on the indoor unit 1b during or after refrigerant replacement, the shutoff valve 11 is closed and the ventilation device on the leaking indoor unit 1b is controlled to ventilate the indoor unit 1b. This allows the refrigerant leaking from the indoor unit 1b to be discharged, preventing safety incidents such as fire or explosion.

[0146] In a specific embodiment of the present invention, when a shutoff valve 11 is present on the indoor unit 1b side, the program for updating the indoor unit 1b is configured such that, during or after the refrigerant replacement process, if refrigerant leakage occurs on the indoor unit 1b side, the shutoff valve 11 corresponding to the leaking indoor unit 1b is closed. If a ventilation device is present on the indoor unit 1b side (specifically, it can be a pre-existing ventilation device or a newly installed ventilation device), during or after the refrigerant replacement process, if refrigerant leakage occurs on the indoor unit 1b side, the valve box or shutoff valve corresponding to the leaking indoor unit 1b is closed, and the ventilation device on the leaking indoor unit 1b side is controlled to ventilate, so that the refrigerant leaking from the indoor unit 1b is discharged, thereby avoiding safety accidents such as fire or explosion.

[0147] In a specific embodiment of the present invention, when a shutoff valve 11 is present on one side of the gas-liquid side of the outdoor unit 14 and a shutoff valve 11 is installed on the other side, the updated program of the outdoor unit 14 is configured such that, during or after the refrigerant replacement process, if a refrigerant leak occurs on the indoor unit 1b side, the shutoff valve 11 is closed. If a ventilation device is present on the indoor unit 1b side (specifically, it can be a pre-existing ventilation device or a newly installed ventilation device), during or after the refrigerant replacement process, if a refrigerant leak occurs on the indoor unit 1b side, the shutoff valve 11 is closed and the ventilation device on the side of the indoor unit 1b where the leak occurs is controlled for ventilation, so that the refrigerant leaking from the indoor unit 1b is discharged to avoid safety accidents such as fire or explosion.

[0148] In a specific embodiment of the present invention, if a shutoff valve 11 is present on one side of the gas-liquid side of the indoor unit 1b and a shutoff valve 11 is installed on the other side; that is, if a shutoff valve 11 is present on one side of the gas-liquid side of the indoor unit 1b and there is installation space on the other side, the shutoff valve 11 is installed. The updated program of the outdoor unit 14 is configured such that: during or after refrigerant replacement, if refrigerant leakage occurs on the indoor unit 1b side, the shutoff valve 11 corresponding to the leaking indoor unit 1b is closed. If a ventilation device is present on the indoor unit 1b side (specifically, it can be a pre-existing ventilation device or a newly installed ventilation device); during or after refrigerant replacement, if refrigerant leakage occurs on the indoor unit 1b side, the shutoff valve 11 corresponding to the leaking indoor unit 1b is closed and the ventilation device on the leaking indoor unit 1b side is controlled to ventilate, thereby discharging the leaked refrigerant from the indoor unit 1b and avoiding safety accidents such as fire or explosion.

[0149] In a specific embodiment of the present invention, when a valve box or a gas-liquid shut-off valve is added to the outdoor unit 14 to cut off the refrigerant, the updated program of the outdoor unit 14 is configured to: during or after the refrigerant replacement process, if a refrigerant leak occurs on the indoor unit 1b side, the valve box or shut-off valve is closed. If a ventilation device is present on the indoor unit 1b side (specifically, it can be a pre-existing ventilation device or a newly installed ventilation device); during or after the refrigerant replacement process, if a refrigerant leak occurs on the indoor unit 1b side, the valve box or shut-off valve is closed, and the ventilation device on the leaking indoor unit 1b side is controlled to ventilate, so that the refrigerant leaking from the indoor unit 1b is discharged, thereby avoiding safety accidents such as fire or explosion.

[0150] In a specific embodiment of the present invention, when a valve box or a gas-liquid shut-off valve for shutting off the refrigerant is added to the indoor unit 1b, the updated program of the indoor unit 1b is configured such that: during or after the refrigerant replacement process, if refrigerant leakage occurs on the indoor unit 1b, the valve box or shut-off valve corresponding to the indoor unit 1b where the leakage occurs is closed. If a ventilation device is present on the indoor unit 1b (specifically, it can be a pre-existing ventilation device or a newly installed ventilation device), during or after the refrigerant replacement process, if refrigerant leakage occurs on the indoor unit 1b, the valve box or shut-off valve corresponding to the indoor unit 1b where the leakage occurs is closed, and the ventilation device on the indoor unit 1b where the leakage occurs is controlled for ventilation, so that the refrigerant leaked from the indoor unit 1b is discharged to avoid safety accidents such as fire or explosion.

[0151] The method for replacing refrigerant in an air conditioner according to the present invention will be described in detail below with reference to several specific embodiments.

[0152] Example 3

[0153] like Figure 3 and 4As shown, if the outdoor unit 14 can recover and store refrigerant, and a shut-off valve 11 is installed on the side of the outdoor unit 14 (the outdoor unit 14 installed with the shut-off valve 11 is generally a new type of outdoor unit 14 that can be used with flammable refrigerants, of course, it can also use non-flammable refrigerants), then the program of the outdoor unit 14 is updated. The updated program specifically includes: upon detecting a refrigerant leak at the indoor unit 1b, controlling the outdoor unit 14 to recover and store the refrigerant; and closing the shut-off valve 11 on the side of the outdoor unit 14 after the recovery is completed. The refrigerant is only recovered by a%, where a is specifically determined according to the actual situation on site, and can be 80, 85, 90 or 92, etc. It is only necessary to ensure that as much refrigerant as possible can be recovered without sucking air into the outdoor unit 14. Preferably, refrigerant detectors can be installed at the indoor unit 1b and the outdoor unit 14 respectively, and the program of the indoor unit 1b is updated, and the program of the outdoor unit 14 is updated at the same time. As a preferred embodiment of this embodiment, if there is installation space on the side of indoor unit 1b, a valve box or shut-off valve can be installed on the side of indoor unit 1b. Specifically, for heat pump systems, shut-off valves are installed on the two branches on the side of indoor unit 1b. When a refrigerant leak occurs in indoor unit 1b, the shut-off valve corresponding to that indoor unit 1b can be closed. This allows the other indoor and outdoor units of the air conditioning system to operate, reducing the impact on the air conditioning system. If the shut-off valve on the side of indoor unit 1b fails, the refrigerant recovery and storage program of outdoor unit 14 can be restarted to recover and store the refrigerant, and then the shut-off valve 11 on the side of outdoor unit 14 can be closed. For heat recovery systems, a shut-off valve is installed on the liquid branch. When a refrigerant leak occurs in indoor unit 1b, the leaking indoor unit 1b is shut down and the shut-off valve, high-pressure gas pipe valve 1g, and low-pressure gas pipe valve 1f corresponding to that indoor unit 1b are closed. If any of the shut-off valve, high-pressure air pipe valve 1g and low-pressure air pipe valve 1f on the indoor unit 1b side fails, you can choose to restart the refrigerant recovery and storage program of the outdoor unit 14 to recover and store the refrigerant, and then close the shut-off valve 11 on the outdoor unit 14 side.

[0154] Example 4

[0155] The air conditioning system is a heat pump system. If the outdoor unit 14 can recycle and store refrigerant, and no shut-off valve is installed on the outdoor unit 14 side (the outdoor unit 14 without a shut-off valve refers to the traditional one that uses non-flammable refrigerant, but it can also use flammable refrigerant), then both main lines 11b on the outdoor unit 14 side are equipped with shut-off valves 15. Figure 5, and update the program of the outdoor unit 14. The updated program specifically includes: when a refrigerant leak is detected at the indoor unit 1b, the outdoor unit 14 is controlled to recover and store the refrigerant, and the stop valve 15 on the main outlet path 11b is closed first, and after the refrigerant recovery is completed, the stop valve 15 on the main inlet path 11b is closed. Among them, the main outlet path 11b is the refrigerant flowing out from the outdoor unit 14, and the main inlet path 11b is the refrigerant flowing from the outside to the outdoor unit 14. Preferably, a two-valve valve box is selected, and the stop valve 15 of one main path 11b uses a valve in the two-valve valve box. The use of a valve box can make the control more stable and reliable. Preferably, a refrigerant detector can be installed at the indoor unit 1b and the outdoor unit 14, and the program of the indoor unit 1b is updated according to the refrigerant detector, and the program of the outdoor unit 14 is updated at the same time. As a preferred specific implementation of this embodiment, if there is installation space on the side of the indoor unit 1b, a stop valve 15 can be installed on the two branches on the side of the indoor unit 1b. When a refrigerant leak occurs in the indoor unit 1b, the stop valve 15 corresponding to the indoor unit 1b can also be closed; if any stop valve 15 on the side of the indoor unit 1b fails, the refrigerant recovery and storage program of the outdoor unit 14 can be restarted to recover and store the refrigerant, and then the stop valve 15 on the side of the outdoor unit 14 can be closed.

[0156] Example 5

[0157] The air conditioning system is a heat recovery system. If the outdoor unit 14 can recycle and store refrigerant, and no shut-off valve is installed on the outdoor unit 14 side, shut-off valves 15 are installed on the liquid pipe 11a, the high-pressure gas pipe 13a and the low-pressure gas pipe 12a. Figure 6 , and update the program of the outdoor unit 14. The updated program specifically includes: when a refrigerant leak is detected at the indoor unit 1b, the outdoor unit 14 is controlled to recover and store the refrigerant, and the stop valve 15 on the refrigerant pipeline that transports the refrigerant to the indoor unit 1b where the refrigerant leak occurs is closed first, and after the refrigerant is recovered, the stop valves 15 on other pipelines are closed. Preferably, a three-valve valve box is selected, that is, the stop valves on the liquid pipe 11a, the high-pressure gas pipe 13a and the low-pressure gas pipe 12a are packaged into a three-valve valve box. The use of a valve box can make the control more stable and reliable. Preferably, a refrigerant detector can be installed at the indoor unit 1b and the outdoor unit 14, and the program of the indoor unit 1b is updated according to the refrigerant detector, and the program of the outdoor unit 14 is updated at the same time. As a preferred embodiment of this embodiment, if there is installation space on the side of indoor unit 1b, a shutoff valve 15 is installed on the liquid branch line. If a refrigerant leak occurs in indoor unit 1b, the leaking indoor unit 1b is shut down and the corresponding shutoff valve 15, high-pressure gas pipe valve 1g, and low-pressure gas pipe valve 1f are closed. If any of the shutoff valve 15, high-pressure gas pipe valve 1g, and low-pressure gas pipe valve 1f on the side of indoor unit 1b fails, the refrigerant recovery and storage program of outdoor unit 14 can be restarted to recover and store the refrigerant, and then the shutoff valve 15 on the side of outdoor unit 14 can be closed.

[0158] Example 6

[0159] The air conditioning system is a heat recovery system. If the outdoor unit 14 cannot store refrigerant and there is installation space on the indoor unit 1b side, a stop valve 15 is installed on the liquid branch line. Figure 7 , and update the program of the indoor unit 1b; the updated program specifically includes: if a refrigerant leak is detected in the indoor unit 1b, the indoor unit 1b where the leak occurs is shut down and the shut-off valve 15, the high-pressure air pipe valve 1g and the low-pressure air pipe valve 1f corresponding to the indoor unit 1b are closed. The shut-off valve 15 is preferably a single-valve valve box, and the use of a valve box can make the control more stable and reliable. Preferably, a refrigerant detector can be installed at the indoor unit 1b and the outdoor unit 14, and the program of the indoor unit 1b is updated according to the refrigerant detector, and the program of the outdoor unit 14 is updated at the same time. As a preferred specific implementation method of this embodiment, a shut-off valve 15 is installed on the liquid pipe 11a, the high-pressure air pipe 13a and the low-pressure air pipe 12a close to the outdoor unit 14, and the program of the outdoor unit 14 is updated. The updated program of the outdoor unit 14 specifically includes: when refrigerant leakage occurs in the indoor unit 1b and any one of the stop valve 15, high-pressure gas pipe valve 1g and low-pressure gas pipe valve 1f on the indoor unit 1b side fails, the stop valve 15 on the outdoor unit 14 side is closed.

[0160] Example 7

[0161] The air conditioning system is a heat recovery system. If the outdoor unit 14 cannot recycle the refrigerant storage, and there is installation space on the indoor unit 1b side, a three-valve valve box is installed on the indoor unit 1b side. Two of the stop valves 15 replace the low-pressure gas pipe valve 1f and the high-pressure gas pipe valve 1g. The third stop valve 15 is installed on the liquid branch line. For details, refer to Figure 8 , and update the program of the indoor unit 1b. The updated program specifically includes: if a refrigerant leak is detected in the indoor unit 1b, the leaking indoor unit 1b is shut down and the three stop valves 15 corresponding to the indoor unit 1b are closed; and both cooling and heating of the indoor unit 1b require controlling the stop valves 15 on the high-pressure branch and the low-pressure branch to achieve. Preferably, a refrigerant detector can be installed at the indoor unit 1b and the outdoor unit 14, and the program of the indoor unit 1b is updated based on the refrigerant detector, and the program of the outdoor unit 14 is updated at the same time. As a preferred specific implementation of this embodiment, stop valves 15 are installed on the liquid pipe 15a, high-pressure gas pipe 13a, and low-pressure gas pipe 12a near the outdoor unit 14 side, and the program of the outdoor unit 14 is updated. The updated program of the outdoor unit 14 specifically includes: if a refrigerant leak occurs in the indoor unit 1b and any of the stop valves 15 on the indoor unit 1b side fails, the stop valve 15 on the outdoor unit 14 side is closed.

[0162] Example 8

[0163] The air conditioning system is a heat pump system. If the outdoor unit 14 cannot recycle the refrigerant storage, and there is installation space on the side of the indoor unit 1b, then install stop valves 15 on the two branches. For details, refer to Figure 9, and update the program of the indoor unit 1b. The updated program specifically includes: if a refrigerant leakage is detected in the indoor unit 1b, then the indoor unit 1b where the leakage occurs and the two stop valves 15 corresponding to the indoor unit 1b are closed. Preferably, a refrigerant detector can be installed at the indoor unit 1b and the outdoor unit 14, and the program of the indoor unit 1b is updated according to the refrigerant detector, and the program of the outdoor unit 14 is updated at the same time. As a preferred specific implementation method of this embodiment, stop valves 15 are installed on both main lines 11b close to the outdoor unit 14 side, and the program of the outdoor unit 14 is updated. The updated program of the outdoor unit 14 specifically includes: when a refrigerant leakage occurs in the indoor unit 1b and any stop valve 15 on the indoor unit 1b side fails, then the stop valve 15 on the outdoor unit 14 side is closed.

[0164] Embodiment 9

[0165] The air conditioning system is a heat recovery system. If the outdoor unit 14 cannot recycle and store refrigerant, and there is no installation space on the indoor unit 1b side (the absence of installation space on the indoor unit 1b side means that due to the layout of the ceiling and other facilities, there is no installation space on the indoor unit 1b side, which makes it impossible to install a stop valve on the indoor unit 1b side; and due to the layout of the building, the indoor unit 1b side cannot be disassembled, which makes it impossible to install a stop valve on the indoor unit 1b side), then a stop valve 15 is installed on the liquid pipe 11a, high-pressure gas pipe 13a and low-pressure gas pipe 12a near the outdoor unit 14 side. For details, refer to Figure 10 , and updates the program for the outdoor unit 14. The updated program specifically includes: if a refrigerant leak is detected in the indoor unit 1b, shutting down all indoor units 1b and the outdoor unit 14, and closing the shutoff valves 15 on the liquid pipe 11a, high-pressure gas pipe 13a, and low-pressure gas pipe 12a. Preferably, refrigerant detectors can be installed in the indoor unit 1b and the outdoor unit 14, and the program for the indoor unit 1b and the outdoor unit 14 can be updated based on the refrigerant detectors.

[0166] Example 10

[0167] The air conditioning system is a heat recovery system. If the outdoor unit 14 cannot recycle the refrigerant storage and there is no installation space on the indoor unit 1b side, multiple stop valves 15 are installed on the liquid pipe 11a, the high-pressure gas pipe 13a and the low-pressure gas pipe 12a. One stop valve 15 can control the flow of refrigerant in at least two indoor units 1b. For details, refer to Figure 11; and update the program of the outdoor unit 14. The shut-off valves 15 are arranged in groups and are arranged in the form of a valve box. The three shut-off valves 15 at the corresponding positions of the liquid pipe 15a, the high-pressure gas pipe 13a and the low-pressure gas pipe 12a adopt a three-valve valve box. Taking the shut-off valve 15 on the high-pressure gas pipe 13a as an example, the shut-off valve 15 on the high-pressure gas pipe 13a can control the flow rate of the refrigerant of all the indoor units 1b downstream thereof, and the corresponding shut-off valves 15 on the liquid pipe 11a and the low-pressure gas pipe 12a can also control the flow rate of the refrigerant of all the indoor units 1b downstream of the shut-off valve 15 on the high-pressure gas pipe 13a. In this embodiment, preferably, a shut-off valve 15 is provided for every two high-pressure branches on the high-pressure gas pipe 13a, a shut-off valve 15 is provided for every two low-pressure branches on the corresponding low-pressure gas pipe 12a, and a shut-off valve 15 is provided for every two liquid branches on the liquid pipe 11a. The shutoff valve 15 on the high-pressure gas pipe 13a can control all the indoor units 1b downstream of it, but it primarily controls the indoor units 1b that are only controllable by that shutoff valve 15, that is, it primarily controls the indoor units 1b between that shutoff valve 15 and the immediately adjacent downstream shutoff valve 15. The updated procedure specifically includes: if a refrigerant leak is detected in an indoor unit 1b, the shutoff valve 15 corresponding to the leaking indoor unit 1b is closed, specifically the two shutoff valves 15 upstream and downstream of the connection point between the high-pressure branch corresponding to the indoor unit 1b and the high-pressure pipe on the high-pressure pipeline, as well as the shutoff valves 15 on the liquid pipe 11a and low-pressure gas pipe 12a corresponding to these two shutoff valves 15. If there is no shutoff valve 15 downstream of the connection point between the high-pressure branch corresponding to the indoor unit 1b and the high-pressure pipe on the high-pressure pipeline, only the shutoff valve 15 upstream of that connection point and the shutoff valves 15 on the liquid pipe 11a and low-pressure gas pipe 12a corresponding to that shutoff valve 15 need to be closed. By closing the stop valve 15, the refrigerant supply to the leaking indoor unit 1b is stopped, further leakage can be prevented, and the safety of the indoor unit can be ensured. Preferably, a refrigerant detector can be installed at the indoor unit 1b and the outdoor unit 14, and the program of the indoor unit 1b can be updated according to the refrigerant detector, and the program of the outdoor unit 14 can be updated at the same time.

[0168] Example 11

[0169] The air conditioning system is a heat pump system. If the outdoor unit 14 cannot recycle and store refrigerant, there is no installation space on the indoor unit 1b side (the absence of installation space on the indoor unit 1b side means that due to the layout of the ceiling and other facilities, there is no installation space on the indoor unit 1b side, which makes it impossible to install a stop valve on the indoor unit 1b side; and because of the layout of the building, the indoor unit 1b side cannot be disassembled, resulting in the inability to install a stop valve on the indoor unit 1b side. In this case, stop valves 15 are installed on both main lines 11b near the outdoor unit 14 side. For details, refer to Figure 12, and updating the program for the outdoor unit 14. The updated program specifically includes: if a refrigerant leak is detected in the indoor unit 1b, closing all indoor units 1b and the outdoor unit 14, and closing the shutoff valves 15 on both main lines 11b. Preferably, refrigerant detectors can be installed in the indoor units 1b and the outdoor units 14, and the program for the indoor unit 1b and the outdoor unit 14 can be updated based on the refrigerant detectors.

[0170] Example 12

[0171] The air conditioning system is a heat pump system. If the outdoor unit 14 cannot recycle and store refrigerant, and there is no installation space on the indoor unit 1b side, multiple stop valves 15 are installed on each main line 11b. One stop valve 15 can control the flow of refrigerant in at least two indoor units 1b. For details, refer to Figure 13 ; and update the program of the outdoor unit 14. The stop valves 15 are arranged in groups and are arranged in the form of a valve box. The two stop valves 15 corresponding to the two main paths 11b adopt a two-valve valve box. Taking the stop valve 15 on the outlet main path 11b as an example, the stop valve 15 on the outlet main path 11b can control the flow rate of the refrigerant of all the indoor units 1b downstream thereof, and the corresponding stop valve 15 on the inlet main path 11b can also control the flow rate of the refrigerant of all the indoor units 1b downstream of the stop valve 15 on the outlet main path 11b. In this embodiment, preferably, a stop valve 15 is provided on every two inlet branches on the outlet main path 11b, and a stop valve 15 is provided on every two outlet branches on the corresponding inlet branch. Among them, the inlet branch is used to transport the refrigerant to the indoor unit 1b, and the outlet branch is used to transport the refrigerant of the indoor unit 1b to the inlet main path 11b. The shutoff valve 15 on the main outlet path 11b can control all the indoor units 1b downstream of it, but it primarily controls the indoor units 1b downstream that are only controllable by the shutoff valve 15, that is, it primarily controls the indoor units 1b between the shutoff valve 15 and the immediately adjacent downstream shutoff valve 15. The updated procedure specifically includes: if a refrigerant leak is detected in an indoor unit 1b, closing the shutoff valve 15 corresponding to the leaking indoor unit 1b, specifically the two shutoff valves 15 on the main outlet path 11b upstream and downstream of the connection point between the intake branch corresponding to the indoor unit 1b and the main outlet path 11b, as well as the shutoff valves 15 on the main outlet path 11b corresponding to these two shutoff valves 15; if there is no shutoff valve 15 downstream of the connection point between the intake branch corresponding to the indoor unit 1b and the main outlet path 11b on the main outlet path 11b, then only the shutoff valve 15 upstream of that connection point and the shutoff valve 15 on the main outlet path 11b corresponding to that shutoff valve 15 need to be closed. By closing the stop valve 15, the refrigerant supply to the leaking indoor unit 1b is stopped, further leakage can be prevented, and the safety of the indoor unit can be ensured. Preferably, a refrigerant detector can be installed at the indoor unit 1b and the outdoor unit 14, and the program of the indoor unit 1b can be updated according to the refrigerant detector, and the program of the outdoor unit 14 can be updated at the same time.

[0172] like Figure 14 As shown, the system adjustment method for preparing for the replacement of refrigerant in the air-conditioning system specifically includes the following steps:

[0173] S01. Obtain the refrigerant amount of the air-conditioning system.

[0174] S02: Determine whether the refrigerant amount is greater than the system safety threshold. If yes, proceed to step S03; if not, proceed to step S04.

[0175] S03, group the multiple indoor units 1b and add a new outdoor unit 14; then proceed to step S04.

[0176] S04: Determine whether the outdoor unit 14 can recycle and store refrigerant. If yes, proceed to step S05; if not, proceed to step S10.

[0177] S05. Determine whether a stop valve 15 is installed on the side of the external unit 14. If yes, proceed to step S6. If yes, proceed to step S07.

[0178] S06. Update the program of the outdoor unit 14. The updated program specifically includes: when a refrigerant leakage is detected at the indoor unit 1b, control the outdoor unit 14 to recover and store the refrigerant, and close the stop valve 15 on the outdoor unit 14 side after the recovery is completed.

[0179] S07: Determine whether the air conditioning system is a heat recovery system. If yes, proceed to step S08; if not, proceed to step S09.

[0180] S08. Install stop valves 15 on the liquid pipe 11a, the high-pressure gas pipe 13a, and the low-pressure gas pipe 12a, and update the program of the external unit 14.

[0181] S09 . Install the stop valves 15 on both main lines 11 b on the side of the external unit 14 , and update the program of the external unit 14 .

[0182] S10. Determine whether the air conditioning system is a heat recovery system. If yes, proceed to step S11; if not, proceed to step S14.

[0183] S11. Determine whether there is installation space on the side of the indoor unit 1b. If yes, proceed to step S12; if not, proceed to step S13.

[0184] S12. Install the shut-off valve 15 on the liquid branch line and update the program of the indoor unit 1b; alternatively, install a three-valve valve box on the indoor unit 1b side, replace the low-pressure air pipe valve 1f and the high-pressure air pipe valve 1g with two of the shut-off valves 15, and install the third shut-off valve 15 on the liquid branch line, and update the program of the indoor unit 1b.

[0185] S13. Install shutoff valves 15 on the liquid pipe 11a, high-pressure gas pipe 13a, and low-pressure gas pipe 12a near the outdoor unit 14, and update the program for the outdoor unit 14. Alternatively, install multiple shutoff valves 15 on each of the liquid pipe 11a, high-pressure gas pipe 13a, and low-pressure gas pipe 12a, with each shutoff valve 15 capable of controlling the refrigerant flow to at least two indoor units 1b. Update the program for the outdoor unit 14.

[0186] S14. Determine whether there is installation space on the side of the indoor unit 1b. If yes, proceed to step S15; if not, proceed to step S16.

[0187] S15. Install the stop valves 15 on the two branches and update the program of the indoor unit 1b.

[0188] S16. Install a shutoff valve 15 on each of the two main lines 11b near the outdoor unit 14, and update the program for the outdoor unit 14. Alternatively, install multiple shutoff valves 15 on each main line 11b, with each shutoff valve 15 capable of controlling the refrigerant flow to at least two indoor units 1b. Update the program for the outdoor unit 14.

[0189] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

Claims

1. A method for replacing refrigerant in an air conditioner, characterized in that: The method comprises the following steps: S11. Detecting the amount of refrigerant required by the air-conditioning system to be replaced; S12. Determine the amount of refrigerant that can be recovered based on the outdoor unit; S13, determining whether the refrigerant can be directly recovered based on the relationship between the amount of recovered refrigerant and the required amount of refrigerant; If yes, go to step S14; S14. Directly replace the refrigerant of the air-conditioning system.

2. The method according to claim 1, characterized in that The amount of recovered refrigerant is directly determined based on the model of the external unit or calculated based on the size of the heat exchanger, the gas-liquid separator and the internal volume of the container that can accommodate the refrigerant in the pipeline.

3. The method according to claim 1, characterized in that The method further comprises: S15. If the answer to step S13 is no, determine whether there is a valve box or a gas-liquid side shut-off valve in the air conditioning system that cuts off the refrigerant; if yes, proceed to step S14; if no, proceed to step S16; S16, installing a valve box or a gas-liquid side shut-off valve capable of shutting off the gas-liquid side in the air conditioning system, and then proceeding to step S17; S17: Replace the refrigerant in the air-conditioning system.

4. The method according to claim 1, wherein “Determining whether refrigerant can be directly recovered based on the relationship between the amount of recovered refrigerant and the amount of required refrigerant” includes: Whether the ratio of the amount of recovered refrigerant to the amount of required refrigerant is greater than a first preset threshold, and / or Whether the difference between the required refrigerant amount and the recovered refrigerant amount is less than or equal to the room safety threshold.

5. A method for replacing refrigerant in an air conditioner, characterized in that: The method comprises the following steps: S21. Determine whether there is a shutoff valve on the gas and liquid sides of the replacement air conditioning system. If both sides have shutoff valves, proceed to step S22; if only one side has shutoff valves, proceed to step S23; if not, proceed to step S25; S22, directly replacing the refrigerant of the air conditioning system; S23, installing a shutoff valve on the other side of the gas-liquid side or installing a valve box or a gas-liquid shutoff valve capable of shutting off the gas-liquid side in the air conditioning system, and then proceeding to step S24; S24, replacing the refrigerant of the air conditioning system; S25. Install a valve box or a gas-liquid side stop valve capable of shutting off the gas-liquid side in the air-conditioning system, and then proceed to step S24.

6. The method according to claim 3 or 5, characterized in that The valve box or the gas-liquid side shut-off valve is installed on the inner unit side and / or the outer unit side; Among them, it is preferably installed on the indoor unit side.

7. The method according to claim 1 or 5, characterized in that Install refrigerant detectors on the indoor and / or outdoor units.

8. The method according to claim 1, 3 or 5, characterized in that A ventilation device is added on the indoor side. When the refrigerant leaks, the leaked refrigerant on the indoor side is discharged into the room through the ventilation device.

9. The method according to claim 5, characterized in that The shut-off valve is a stop valve and / or an electronic expansion valve.

10. The method according to claim 3 or 5, characterized in that The method further comprises: Before or after replacing the refrigerant of the air-conditioning system, the number of outdoor units corresponding to indoor units of the air-conditioning system is determined according to the required refrigerant amount and the system safety threshold, so as to increase the outdoor units or reduce the indoor units.

11. The method according to claim 6, characterized in that The method further comprises: After replacing the refrigerant in the air conditioning system, update the program of the indoor unit and / or outdoor unit.

12. The method according to claim 1, characterized in that When the outdoor unit is capable of recovering the refrigerant, the program of updating the outdoor unit is configured such that if a refrigerant leak occurs on the indoor unit side, the outdoor unit recovers the refrigerant.

13. The method according to claim 3, characterized in that When the external unit cannot recover the refrigerant and there is a valve box or gas-liquid side stop valve on the external unit side that cuts off the refrigerant; The program for updating the outdoor unit is configured to close the valve box or the stop valve if a refrigerant leak occurs on the indoor unit side.

14. The method according to claim 3, characterized in that When the outdoor unit cannot recycle the refrigerant and there is a valve box or gas-liquid side stop valve on the indoor unit side that cuts off the refrigerant; The program for updating the indoor unit is configured such that if a refrigerant leak occurs on the indoor unit side, the valve box or the shut-off valve corresponding to the indoor unit where the leak occurs is closed.

15. The method according to claim 3, characterized in that When the outdoor unit cannot recycle the refrigerant and a valve box or a gas-liquid side stop valve for cutting off the refrigerant is added to the outdoor unit; The program for updating the outdoor unit is configured to close the valve box or the stop valve if a refrigerant leak occurs on the indoor unit side.

16. The method according to claim 3, characterized in that When the outdoor unit cannot recycle the refrigerant and a valve box or a gas-liquid side stop valve for cutting off the refrigerant is added to the indoor unit; The program for updating the indoor unit is configured such that if a refrigerant leak occurs on the indoor unit side, the valve box or the shut-off valve corresponding to the indoor unit where the leak occurs is closed.

17. The method according to claim 8 when dependent on claim 1, characterized in that When the outdoor unit is capable of recovering refrigerant, the updated program of the outdoor unit is configured such that if refrigerant leakage occurs on the indoor unit side, the outdoor unit recovers the refrigerant and controls the ventilation device on the indoor unit side where the leakage occurs to perform ventilation.

18. The method according to claim 8 when dependent on claim 3, characterized in that When the external unit cannot recover the refrigerant and there is a valve box or gas-liquid side stop valve on the external unit side that cuts off the refrigerant; The program for updating the outdoor unit is configured such that if refrigerant leakage occurs on the indoor unit side, the valve box or the stop valve is closed, and the ventilation device on the indoor unit side where the leakage occurs is controlled to perform ventilation.

19. The method according to claim 8 when dependent on claim 3, characterized in that When the outdoor unit cannot recycle the refrigerant and there is a valve box or gas-liquid side stop valve on the indoor unit side that cuts off the refrigerant; The program for updating the indoor unit is configured as follows: if refrigerant leakage occurs on the indoor unit side, the valve box or the stop valve corresponding to the indoor unit where the leakage occurs is closed, and the ventilation device on the indoor unit side where the leakage occurs is controlled to perform ventilation.

20. The method according to claim 8 when dependent on claim 3, characterized in that When the outdoor unit cannot recycle the refrigerant and a valve box or a gas-liquid side stop valve for cutting off the refrigerant is added to the outdoor unit; The program for updating the outdoor unit is configured such that if refrigerant leakage occurs on the indoor unit side, the valve box or the stop valve is closed, and the ventilation device on the indoor unit side where the leakage occurs is controlled to perform ventilation.

21. The method according to claim 8 when dependent on claim 3, characterized in that When the outdoor unit cannot recycle the refrigerant and a valve box or a gas-liquid side stop valve for cutting off the refrigerant is added to the indoor unit; The program for updating the indoor unit is configured as follows: if refrigerant leakage occurs on the indoor unit side, the valve box or the stop valve corresponding to the indoor unit where the leakage occurs is closed, and the ventilation device on the indoor unit side where the leakage occurs is controlled to perform ventilation.

22. The method according to claim 5, characterized in that When there is a shut-off valve on the external unit side; The program for updating the outdoor unit is configured to close the shutoff valve if refrigerant leakage occurs on the indoor unit side.

23. The method according to claim 5, characterized in that When the shut-off valve is present on the inner unit side; The program for updating the indoor unit is configured such that if a refrigerant leak occurs on the indoor unit side, the shutoff valve corresponding to the indoor unit where the leak occurs is closed.

24. The method according to claim 5, characterized in that When there is a shutoff valve on one side of the gas-liquid side of the outdoor unit and a shutoff valve is installed on the other side; The program for updating the outdoor unit is configured to close the shutoff valve if refrigerant leakage occurs on the indoor unit side.

25. The method according to claim 5, characterized in that When there is a shutoff valve on one side of the gas-liquid side of the internal unit and a shutoff valve is installed on the other side; The program for updating the outdoor unit is configured such that if a refrigerant leak occurs on the indoor unit side, the shutoff valve corresponding to the indoor unit where the leak occurs is closed.

26. The method according to claim 5, characterized in that When a valve box or gas-liquid side stop valve is added to cut off the refrigerant on the external unit side; The program for updating the outdoor unit is configured to close the valve box or the stop valve if a refrigerant leak occurs on the indoor unit side.

27. The method according to claim 5, characterized in that When a valve box or gas-liquid side stop valve is added to cut off the refrigerant on the indoor unit side; The program for updating the indoor unit is configured such that if a refrigerant leak occurs on the indoor unit side, the valve box or the shut-off valve corresponding to the indoor unit where the leak occurs is closed.

28. The method according to claim 8 when dependent on claim 5, characterized in that When there is a shut-off valve on the external unit side; The program for updating the outdoor unit is configured such that if refrigerant leakage occurs on the indoor unit side, the shut-off valve is closed, and the ventilation device on the indoor unit side where the leakage occurs is controlled to perform ventilation.

29. The method according to claim 8 when dependent on claim 5, characterized in that When the shut-off valve is present on the inner unit side; The program for updating the indoor unit is configured such that if refrigerant leakage occurs on the indoor unit side, the shut-off valve corresponding to the indoor unit where the leakage occurs is closed, and the ventilation device on the indoor unit side where the leakage occurs is controlled to perform ventilation.

30. The method according to claim 8 when dependent on claim 5, characterized in that When there is a shutoff valve on one side of the gas-liquid side of the outdoor unit and a shutoff valve is installed on the other side; The program for updating the outdoor unit is configured such that if refrigerant leakage occurs on the indoor unit side, the shut-off valve is closed, and the ventilation device on the indoor unit side where the leakage occurs is controlled to perform ventilation.

31. The method according to claim 8 when dependent on claim 5, characterized in that When there is a shutoff valve on one side of the gas-liquid side of the internal unit and a shutoff valve is installed on the other side; The program for updating the outdoor unit is configured such that if refrigerant leakage occurs on the indoor unit side, the shut-off valve corresponding to the indoor unit where the leakage occurs is closed, and the ventilation device on the indoor unit side where the leakage occurs is controlled to perform ventilation.

32. The method according to claim 8 when dependent on claim 5, characterized in that When a valve box or gas-liquid side stop valve is added to cut off the refrigerant on the external unit side; The program for updating the outdoor unit is configured such that if refrigerant leakage occurs on the indoor unit side, the valve box or the stop valve is closed, and the ventilation device on the indoor unit side where the leakage occurs is controlled to perform ventilation.

33. The method according to claim 8 when dependent on claim 5, characterized in that When a valve box or gas-liquid side stop valve is added to cut off the refrigerant on the indoor unit side; The program for updating the indoor unit is configured as follows: if refrigerant leakage occurs on the indoor unit side, the valve box or the stop valve corresponding to the indoor unit where the leakage occurs is closed, and the ventilation device on the indoor unit side where the leakage occurs is controlled to perform ventilation.

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