Refrigerant detection method, air conditioner, and storage medium

Abstract

The application discloses a refrigerant detection method, an air conditioner and a storage medium, wherein the refrigerant detection method comprises the following steps: for any indoor unit in the air conditioner, determining at least one target indoor unit matched with the first set temperature of the indoor unit from the air conditioner; calculating the difference between the current first pipeline temperature of the indoor unit and the current second pipeline temperature of each target indoor unit to obtain at least one first deviation value; and determining the leakage state of the indoor unit according to each first deviation value and the operation state of the indoor unit. The technical scheme is designed to improve the troubleshooting rate of the air conditioner in large places.

Description

TECHNICAL FIELD

[0001] The present application relates to the air conditioning technical field, particularly relates to a refrigerant detection method, air conditioner and storage medium. BACKGROUND

[0002] At present, large air conditioners include ceiling machines applied to large shopping malls or hotels, and the ceiling machines have a characteristic that the space is large, and multiple ceiling machines need to be installed to meet the refrigeration effect of the place, so that when refrigerant leakage occurs, due to the volatilization characteristics of some refrigerants, the pipeline of refrigerant leakage cannot be checked and replaced in time. SUMMARY

[0003] The main purpose of the present application is to provide a refrigerant detection method, air conditioner and storage medium, which aims to improve the fault troubleshooting rate of air conditioners in large places.

[0004] To achieve the above purpose, the refrigerant detection method provided by the present application is applied to an air conditioner, the air conditioner includes multiple indoor units that are connected in communication and have consistent operating states, and the method comprises the following steps:

[0005] For any indoor unit in the air conditioner, at least one target indoor unit matched with the first set temperature of the indoor unit is determined from the air conditioner;

[0006] The difference between the current first pipeline temperature of the indoor unit and the current second pipeline temperature of each target indoor unit is calculated to obtain at least one first deviation value;

[0007] The leakage state of the indoor unit is determined according to each first deviation value and the operating state of the indoor unit.

[0008] In some embodiments, for any indoor unit in the air conditioner, at least one target indoor unit matched with the current set temperature of the indoor unit is determined from the air conditioner, comprising:

[0009] For any indoor unit in the air conditioner, the second set temperature of other indoor units in the air conditioner except the indoor unit is obtained;

[0010] At least one target indoor unit is determined from other indoor units according to the first set temperature and the second set temperature.

[0011] In some embodiments, the leakage state of the indoor unit is determined according to each first deviation value and the operating state of the indoor unit, comprising:

[0012] If the first deviation value is greater than a preset reference deviation value, the first pipeline temperature and the second pipeline temperature are compared to obtain a comparison result;

[0013] determining a leakage state of the indoor unit according to the comparison result and the operation state.

[0014] In some embodiments, the determining a leakage state of the indoor unit according to the comparison result and the operation state comprises:

[0015] when the first pipe temperature is greater than the second pipe temperature and the operation state comprises a cooling state, or when the first pipe temperature is less than the second pipe temperature and the operation state comprises a heating state, determining the leakage state as a non-leakage state;

[0016] when the first pipe temperature is less than the second pipe temperature and the operation state comprises a cooling state, or when the first pipe temperature is greater than the second pipe temperature and the operation state comprises a heating state, determining the leakage state as a leakage state.

[0017] In some embodiments, before the determining a leakage state of the indoor unit according to each of the first deviation values and the operation state of the indoor unit, the method further comprises:

[0018] if the first deviation value is greater than a preset reference deviation value, sampling at least one third pipe temperature within a preset time length and obtaining a second deviation value according to the third pipe temperature;

[0019] the determining a leakage state of the indoor unit according to each of the first deviation values and the operation state of the indoor unit comprises:

[0020] determining a leakage state of the indoor unit according to each of the second deviation values and the operation state of the indoor unit.

[0021] In some embodiments, the sampling at least one third pipe temperature within a preset time length and obtaining a second deviation value according to the third pipe temperature comprises:

[0022] sampling at least one third pipe temperature of the indoor unit according to a preset sampling interval and a preset sampling number;

[0023] calculating a first average value of the at least one third pipe temperature;

[0024] calculating a difference between the first average value and a second average value of each of the target indoor units to obtain a corresponding second deviation value.

[0025] In some embodiments, a plurality of the indoor units are connected to each other through a communication circuit, and the communication circuit comprises:

[0026] The communication chip comprises a first differential pin, a second differential pin, a first communication pin, a second communication pin and a communication enable pin, wherein the first communication pin, the second communication pin and the communication enable pin are respectively used for accessing a controller of a local unit.

[0027] A first resistor is connected in series between the first differential pin and a first terminal of the local unit.

[0028] A second resistor is connected in series between the second differential pin and a second terminal of the local unit.

[0029] A third resistor has a first end connected to the first differential pin.

[0030] A jumper cap is connected in series between a second end of the third resistor and a first end of the second resistor.

[0031] In some embodiments, the communication circuit further comprises:

[0032] A first static tube is connected in series between the first terminal and the ground.

[0033] A second static tube is connected in series between the second terminal and the ground.

[0034] The present application also provides an air conditioner comprising an outdoor unit and a plurality of indoor units, wherein the outdoor unit is electrically connected to the indoor units, and the indoor units are connected to each other, and each indoor unit comprises a controller for executing the above refrigerant detection method.

[0035] The present application also provides a storage medium storing the above refrigerant detection method.

[0036] An electronic device comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the above refrigerant detection method.

[0037] In the technical solution of the present application, the plurality of indoor units are connected in communication and have consistent operating states, so that any indoor unit in the air conditioner can determine at least one target indoor unit from the plurality of indoor units, and by using the principle that when the air conditioner leaks refrigerant, the working efficiency decreases and the pipe temperature of the refrigerant transmission pipeline deviates, the first deviation value between the first pipeline temperature of the indoor unit and the second pipeline temperature of each target indoor unit is determined, and the operating state is used to determine the leakage state of the indoor unit, so that the refrigerant leakage of any indoor unit can be accurately determined in large shopping malls, hotels and other large places, the troubleshooting rate of the air conditioner is improved, and the situation that the pipeline with refrigerant leakage cannot be timely checked and replaced due to the volatilization characteristics of some refrigerants is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to make the technical solutions of the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only need to be some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor.

[0039] Figure 1 The flowchart of an embodiment of the refrigerant detection method of the present application is shown.

[0040] Figure 2 The flowchart of an embodiment of step S100 in the present application is shown.

[0041] Figure 3 The flowchart of an embodiment of step S300 in the present application is shown.

[0042] Figure 4 The flowchart of another embodiment of the refrigerant detection method of the present application is shown.

[0043] Figure 5 The structural diagram of an embodiment of the air conditioner to which the present application is applied is shown.

[0044] Figure 6 The circuit connection diagram of an embodiment of the communication circuit in the present application is shown.

[0045] Explanation of the reference numerals:

[0046] Reference Name Reference Name 510 First terminal J1 Jumper cap 520 Second terminal TVS1 - TVS2 First electrostatic tube - Second electrostatic tube 530 Communication circuit R1 - R3 First resistor - Third resistor U1 Communication chip

[0047] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0048] The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0049] In addition, the description such as "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist, nor in the protection scope required by the present application.

[0050] The present application provides a refrigerant detection method applied to an air conditioner.

[0051] Reference Figure 1 In an embodiment, the air conditioner includes a plurality of indoor units connected in communication and having consistent running states, and the method includes:

[0052] S100, for any indoor unit in the air conditioner, determining at least one target indoor unit matched with the first set temperature of the indoor unit from the air conditioner;

[0053] The air conditioner, as a one-to-many system, includes a plurality of indoor units as slaves, and an outdoor unit providing a refrigerant transmission pipeline for each indoor unit. Since the indoor units share an outdoor unit for heat exchange, the running states of the indoor units are consistent at the same time for the one-to-many air conditioner.

[0054] In the embodiment, the plurality of indoor units are connected in communication, specifically, the indoor units can communicate with each other by using a BMS (Battery Management System) circuit for transmitting running state data. Thus, when the air conditioner is working, one indoor unit is taken as the working main body, the target temperature set by the indoor unit is taken as the first set temperature, and the indoor unit and other indoor units except the indoor unit are communicated and data is transmitted to determine the indoor unit matched with the first set temperature, and the matched indoor unit is taken as the target indoor unit.

[0055] The first set temperature of the indoor unit can be set by an interactive component such as a touch screen, a key panel, a remote controller, or can be set by a host computer.

[0056] S200, calculating the difference between the current first pipeline temperature of the indoor unit and the current second pipeline temperature of each target indoor unit to obtain at least one first deviation value;

[0057] It should be noted that in the indoor unit of the air conditioner, the refrigerant leakage of the evaporator and the internal pipeline thereof can be detected by the refrigerant sensor module carried by the indoor unit, and the troubleshooting difficulty is low. However, the refrigerant transmission pipeline between the outdoor unit and the indoor unit has different lengths in different occasions and environments. It is necessary to add multiple refrigerant sensors on one pipeline for detecting the pipeline by using the refrigerant sensor module. The longer the refrigerant transmission pipeline is, the more refrigerant sensors are needed, the higher the cost is, and the more interfaces required by the refrigerant sensor are. Therefore, in order to reduce the cost, the refrigerant sensor is usually not considered for pipeline troubleshooting.

[0058] Since the use environment of the multi-split type is mostly a shopping mall, a hotel, and an indoor large restaurant, the use environment of each indoor unit is roughly the same. Under the condition of the same model and the same set temperature, the temperature difference of the refrigerant transmission pipeline is small. When the refrigerant leaks, it will affect the working efficiency of the indoor unit, and the working efficiency is reduced. In particular, the indoor unit connected to the leaked refrigerant transmission pipeline has a worse temperature control effect than other indoor units. Therefore, in the present embodiment, when detecting the leakage of the multiple indoor units of the air conditioner, one indoor unit is taken as the working subject, and the first pipeline temperature of the indoor unit is detected by using the existing pipeline temperature sensor in the indoor unit. It can be understood that in the indoor unit, the pipeline temperature sensor is usually arranged at the return air inlet or the air outlet of the indoor unit, and is used for detecting the temperature of the refrigerant transmission pipeline in which the indoor unit is located.

[0059] The indoor unit obtains the first pipeline temperature by the pipeline temperature sensor, determines the second pipeline temperature corresponding to each target indoor unit according to the running state data transmitted by each target indoor unit, and obtains at least one first deviation value by taking the absolute value after the first pipeline temperature is respectively subtracted from each second pipeline temperature.

[0060] S300, determining the leakage state of the indoor unit according to each first deviation value and the running state of the indoor unit.

[0061] Although the working efficiency of the indoor unit is affected when the refrigerant leaks, there can be more than one executable running state for the air conditioner. In the air conditioner of the heating and cooling type, at least two running states including refrigeration and heating are included. Therefore, in the present embodiment, when detecting the refrigerant leakage of the air conditioner, it is not only necessary to compare the indoor unit with the corresponding target indoor unit according to each first deviation value to determine whether one of them has leakage, but also necessary to obtain the running state of the air conditioner to determine whether it is the indoor unit that leaks, so as to obtain the leakage state of the indoor unit.

[0062] In the technical scheme, the multiple indoor units are connected in communication with each other and have consistent operating states, so that any indoor unit in the air conditioner can determine at least one target indoor unit from the multiple indoor units, and when the air conditioner leaks refrigerant, the working efficiency is reduced, which can cause the temperature of the refrigerant transmission pipeline to deviate, and the first deviation value between the first pipeline temperature of the indoor unit and the second pipeline temperature of each target indoor unit is used to determine the leakage state of the indoor unit, so that the leakage of refrigerant of any indoor unit can be accurately determined in a large shopping mall or a large hotel, the troubleshooting rate of the air conditioner is improved, and the situation that the pipeline leaking refrigerant cannot be replaced in time due to the volatilization characteristics of some refrigerants is reduced.

[0063] Further, in the present application, the air conditioner further comprises an outdoor unit, which serves as a host computer, and the main functions thereof are to collect state data of the indoor units and to control whether to supply refrigerant. The outdoor unit and each indoor unit are connected in current loop communication, and the refrigerant transmission pipeline of each indoor unit corresponds to the communication line thereof. Therefore, the outdoor unit only needs to process and control the data signals sent by the indoor units, and when it is determined according to the received data signals that the indoor unit represented by the data signals is a faulty indoor unit, the outdoor unit controls the faulty indoor unit to start the air supply mode to prevent the indoor refrigerant concentration from being too high, and controls the expansion valve of the corresponding refrigerant transmission pipeline to stop the supply of refrigerant to the faulty indoor unit, until the maintenance personnel complete the maintenance, and the above steps are repeated, the data is sampled and analyzed, and the fault signal is cancelled when no abnormality is found.

[0064] Reference Figure 2 In an embodiment, for any indoor unit in the air conditioner, at least one target indoor unit that matches the current set temperature of the indoor unit is determined from the air conditioner, and the method comprises the following steps.

[0065] S110, for any indoor unit in the air conditioner, the second set temperature of other indoor units in the air conditioner except the indoor unit is obtained.

[0066] S120, at least one target indoor unit is determined from the other indoor units according to the first set temperature and the second set temperature.

[0067] In order to make the first deviation value between the two indoor units more reliable, or in other words, to more accurately reflect the deviation of the pipe temperature of the refrigerant transmission pipeline between the two indoor units, in the embodiment, when the air conditioner is working, one indoor unit is taken as the main working unit, and when the indoor unit is matched with multiple indoor units except the indoor unit, an indoor unit with the same first set temperature as the indoor unit is selected for judgment. Specifically, the first set temperature of the indoor unit is matched with the second set temperature of the other indoor units except the indoor unit, and if the second set temperature of one indoor unit is the same as the first set temperature, the corresponding indoor unit is taken as the target indoor unit.

[0068] Taking the BMS circuit communication as an example, in each inner machine, corresponding identification information such as address, serial number and the like is stored, which is used for mutual identification and communication between the inner machines. In the running process, one inner machine requests data from other inner machines except the inner machine through the BMS circuit to receive the return signals of the other inner machines, and the format of the return signals is: start bit + inner machine address + second set temperature + pipe temperature + end bit. When the second set temperature is obtained according to the return signals, the second set temperature is matched with the first set temperature of the inner machine, and after the target inner machine with the same first set temperature is matched, the corresponding inner machine address is recorded, and only the data sent by the target inner machine is received and analyzed subsequently.

[0069] With reference to Figure 3 In an embodiment, the determining the leakage state of the inner machine according to the first deviation value and the running state of the inner machine comprises:

[0070] S310, comparing the first pipe temperature with the second pipe temperature to obtain a comparison result if the first deviation value is greater than a preset reference deviation value.

[0071] S320, determining the leakage state of the inner machine according to the comparison result and the running state.

[0072] In the embodiment, the reference deviation value is set according to the average deviation value obtained in the leakage experiment of the inner machine. Specifically, when the inner machine detects that the first deviation value is greater than the reference deviation value, it is indicated that there is an inner machine leakage between the inner machine and the target inner machine corresponding to the first deviation value. However, since the first deviation value is an absolute value, it is necessary to further compare the first pipe temperature with the second pipe temperature to determine the numerical value of the two, so as to determine whether it is the inner machine leakage according to the comparison result and the running state of the inner machine, thereby obtaining the leakage state of the inner machine.

[0073] Specifically, the determining the leakage state of the inner machine according to the comparison result and the running state comprises:

[0074] When the first pipe temperature is greater than the second pipe temperature and the running state comprises a refrigeration state, or when the first pipe temperature is less than the second pipe temperature and the running state comprises a heating state, the leakage state is determined as an un-leaked state.

[0075] When the first pipe temperature is less than the second pipe temperature and the running state comprises a refrigeration state, or when the first pipe temperature is greater than the second pipe temperature and the running state of the inner machine comprises a heating state, the leakage state is determined as a leaked state.

[0076] In the embodiment, the reference deviation value is 3.5℃, the first pipe temperature is 20℃, and the second pipe temperature is 24℃. The first deviation value is calculated to be 4℃, which is greater than 3.5℃. It is considered that there is a refrigerant leakage between the indoor unit and the target indoor unit corresponding to the second pipe temperature. If the indoor unit is in a heating state, it is considered that the indoor unit is in a leaked state. If the indoor unit is in a cooling state, it is considered that the indoor unit is in a non-leaked state.

[0077] In an embodiment, before the leakage state of the indoor unit is determined according to each first deviation value and the operation state of the indoor unit, the method further comprises:

[0078] S400, if the first deviation value is greater than a preset reference deviation value, at least one third pipe temperature is sampled within a preset time length, and a second deviation value is obtained according to the third pipe temperature;

[0079] The leakage state of the indoor unit is determined according to each first deviation value and the operation state of the indoor unit, comprising:

[0080] S330, the leakage state of the indoor unit is determined according to each second deviation value and the operation state of the indoor unit.

[0081] In the embodiment, when the indoor unit detects that the first deviation value is greater than the preset reference deviation value, further sampling is performed to avoid misjudgment of refrigerant leakage.

[0082] Specifically, the preset time length is set by a developer according to actual needs, such as 5 minutes, 15 minutes, and the like.

[0083] Within the preset time length, a second deviation value can be calculated according to one third pipe temperature, the second deviation value is compared with the reference deviation value, and the leakage state of the indoor unit is determined according to the second deviation value and the operation state of the indoor unit. A plurality of second deviation values can be calculated according to a plurality of third pipe temperatures, and the leakage state of the indoor unit is determined according to the number of second deviation values greater than the reference deviation value and the operation state of the indoor unit. The average value of a plurality of third pipe temperatures can be calculated, and the leakage state of the indoor unit is determined according to the average value and the operation state of the indoor unit, and the like.

[0084] Reference Figure 4 In an embodiment, the at least one third pipe temperature is sampled within a preset time length, and a second deviation value is obtained according to the third pipe temperature, comprising:

[0085] S410, sampling is performed according to a preset sampling interval and a preset sampling number, and at least one third pipe temperature of the indoor unit is obtained;

[0086] S420, calculate a first average value of the at least one third pipe temperature;

[0087] S430, calculate a second deviation value corresponding to a difference between the first average value and a second average value of each of the target internal machines.

[0088] In the embodiment, the preset sampling interval and the preset sampling number are set by the R&D personnel according to actual needs. For example, the preset sampling interval is set to 3 minutes, and the preset sampling number is set to 5 times.

[0089] After detecting that the first deviation value is greater than the preset reference deviation value, the internal machine enters a sampling mode. In a preset time period of 15 minutes, the internal machine samples once every 3 minutes, records the sampled third pipe temperature, and counts. When the count reaches 5 times, the internal machine calculates a first average value of the third pipe temperatures collected for 5 times, and calculates a second deviation value according to the first average value and a second average value of each of the target internal machines. If the calculation result is still greater than the reference deviation value, the running state of the internal machine is determined again to reduce the error caused by the initial judgment.

[0090] Referring to Figure 5 and Figure 6 In an embodiment, a plurality of the internal machines are connected to each other in communication through a communication circuit 530, and the communication circuit 530 includes:

[0091] A communication chip U1 includes a first differential pin, a second differential pin, a first communication pin, a second communication pin, and a communication enable pin. The first communication pin, the second communication pin, and the communication enable pin are respectively used to access a controller of the internal machine;

[0092] A first resistor R1 is connected in series between the first differential pin and a first wiring terminal 510 of the plurality of internal machines;

[0093] A second resistor R2 is connected in series between the second differential pin and a second wiring terminal 520 of the plurality of internal machines;

[0094] A third resistor R3 has a first end connected to the first differential pin;

[0095] A jumper cap J1 is connected in series between a second end of the third resistor R3 and a first end of the second resistor R2.

[0096] In the embodiment, the CN1 and CN2 are communication interfaces of the internal machine, each of which comprises at least two engineering terminals for connecting communication lines, i.e., the first terminal 510 and the second terminal 520.

[0097] Therefore, in order to avoid the short circuit of the signal lines of the first differential pin and the second differential pin caused by the parallel connection of the multiple terminal resistors (i.e., the third resistor R3, which is mainly used for signal reflection and echo), the jumper cap J1 is added to realize the connection and disconnection of the terminal resistor.

[0098] Referring to Figure 5 and Figure 6 In an embodiment, the communication circuit 530 further comprises:

[0099] The first electrostatic tube TVS1 is connected in series between the first terminal 510 and the ground;

[0100] The second electrostatic tube TVS2 is connected in series between the second terminal 520 and the ground.

[0101] In the embodiment, the first electrostatic tube TVS1 and the second electrostatic tube TVS2 are directly connected to the terminals of other internal machines to release the static electricity entering the circuit and avoid the damage of the static electricity to the circuit.

[0102] The application also provides a storage medium storing the above refrigerant detection method, and the specific structure of the refrigerant detection method is referred to the above embodiments. Since the storage medium adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0103] The application also provides an air conditioner comprising an external machine and multiple internal machines, wherein the external machine is electrically connected with the multiple internal machines, the multiple internal machines are connected with each other, and the internal machine comprises a controller for executing the above refrigerant detection method. The specific structure of the refrigerant detection method is referred to the above embodiments. Since the air conditioner adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0104] The above description is only optional embodiments of the application, and does not limit the patent scope of the application. Any equivalent structural transformation based on the content of the specification and drawings, or direct / indirect application in other related technical fields under the inventive concept of the application is included in the patent protection scope of the application.

Claims

1. A refrigerant detection method applied to an air conditioner, characterized by comprising: The air conditioner comprises a plurality of indoor units connected in communication and having consistent running states, and the method comprises: For any indoor unit in the air conditioner, at least one target indoor unit matching a first set temperature of the indoor unit is determined from the air conditioner; A first deviation value is calculated by subtracting a current first pipe temperature of the indoor unit from a current second pipe temperature of each target indoor unit; A leakage state of the indoor unit is determined according to each first deviation value and a running state of the indoor unit; If the first deviation value is greater than a preset reference deviation value, the first pipe temperature and the second pipe temperature are compared to obtain a comparison result; The leakage state of the indoor unit is determined according to the comparison result and the running state, and the leakage state is determined as an un-leaked state when the first pipe temperature is greater than the second pipe temperature and the running state comprises a refrigeration state, or when the first pipe temperature is less than the second pipe temperature and the running state comprises a heating state; The leakage state of the indoor unit is determined as a leaked state when the first pipe temperature is less than the second pipe temperature and the running state comprises a refrigeration state, or when the first pipe temperature is greater than the second pipe temperature and the running state comprises a heating state.

2. A refrigerant detection method applied to an air conditioner, characterized by comprising: The air conditioner comprises a plurality of indoor units connected in communication and having consistent running states, and the method comprises: For any indoor unit in the air conditioner, at least one target indoor unit matching a first set temperature of the indoor unit is determined from the air conditioner; A first deviation value is calculated by subtracting a current first pipe temperature of the indoor unit from a current second pipe temperature of each target indoor unit; A leakage state of the indoor unit is determined according to each first deviation value and a running state of the indoor unit; If the first deviation value is greater than a preset reference deviation value, at least one third pipe temperature of the indoor unit is sampled at a preset sampling interval and a preset sampling number of times, and a first average value of the at least one third pipe temperature is calculated; a second deviation value is calculated by subtracting a second average value of each target indoor unit from the first average value; The leakage state of the indoor unit is determined according to each second deviation value and the running state of the indoor unit.

3. The refrigerant detection method according to claim 1 or 2, wherein For any indoor unit in the air conditioner, at least one target indoor unit matching a first set temperature of the indoor unit is determined from the air conditioner, comprising: For any indoor unit in the air conditioner, a second set temperature of other indoor units except the indoor unit in the air conditioner is obtained; At least one target indoor unit is determined from other indoor units according to the first set temperature and the second set temperature.

4. The refrigerant detection method according to claim 1 or 2, wherein The plurality of indoor units are connected in communication through a communication circuit, and the communication circuit comprises: A communication chip comprising a first differential pin, a second differential pin, a first communication pin, a second communication pin and a communication enable pin, wherein the first communication pin, the second communication pin and the communication enable pin are respectively used for accessing a controller of the indoor unit; A first resistor connected in series between the first differential pin and a first wiring terminal of the plurality of indoor units; a second resistor connected in series between the second differential pin and a second terminal of the plurality of inner units; a third resistor having a first end connected to the first differential pin; a jumper cap connected in series between a second end of the third resistor and a first end of the second resistor.

5. The refrigerant detection method according to claim 4, wherein The communication circuit further comprises: a first static tube connected in series between the first terminal and ground; a second static tube connected in series between the second terminal and ground.

6. An air conditioner characterized by comprising: The system comprises an outer unit and a plurality of inner units, the outer unit is electrically connected to the plurality of inner units respectively, the plurality of inner units are connected to each other, and the inner unit comprises a controller for executing the refrigerant detection method according to any one of claims 1-5.

7. A storage medium, characterized by The system stores the refrigerant detection method according to any one of claims 1-5.

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