Refrigerant detection method, air conditioner and storage medium

Abstract

The invention discloses a refrigerant detection method, an air conditioner and a storage medium, and the refrigerant detection method comprises the steps that 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; the difference value between the current first pipeline temperature of the indoor unit and the current second pipeline temperature of each target indoor unit is calculated, and at least one first deviation value is obtained; the leakage state of the indoor unit is determined according to the first deviation values and the running state of the indoor unit; according to the technical scheme, the troubleshooting rate of the air conditioner in a large place is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and in particular to a refrigerant detection method, an air conditioner and a storage medium. Background Art

[0002] At present, large air conditioners include ceiling units used in large shopping malls or hotels. The use environment of the ceiling units has a characteristic: the space is large, and multiple ceiling units need to be installed to meet the cooling effect of the place. This means that when a refrigerant leaks, due to the volatile characteristics of some refrigerants, the refrigerant leaking pipeline cannot be checked and replaced in time. Summary of the invention

[0003] The main purpose of the present invention is to provide a refrigerant detection method, an air conditioner and a storage medium, aiming to improve the troubleshooting rate of the air conditioner in large places.

[0004] To achieve the above object, the refrigerant detection method proposed in the present invention is applied to an air conditioner, wherein the air conditioner includes a plurality of indoor units that are communicatively connected to each other and have the same operating status, and the method includes:

[0005] For any of the indoor units in the air conditioner, determining at least one target indoor unit from the air conditioner that matches the first set temperature of the indoor unit;

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

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

[0008] In some embodiments, for any of the indoor units in the air conditioner, determining at least one target indoor unit from the air conditioner that matches the current set temperature of the indoor unit includes:

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

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

[0011] In some embodiments, determining the leakage state of the indoor unit according to each of the first deviation values ​​and the operating state of the indoor unit includes:

[0012] If the first deviation value is greater than a preset reference deviation value, comparing the first pipe temperature with the second pipe temperature to obtain a comparison result;

[0013] The leakage state of the indoor unit is determined according to the comparison result and the operating state.

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

[0015] When the first pipe temperature is greater than the second pipe temperature and the operating state includes a cooling state, or when the first pipe temperature is less than the second pipe temperature and the operating state includes a heating state, determining that the leakage state is a non-leakage state;

[0016] When the first pipe temperature is lower than the second pipe temperature and the operating state includes a cooling state, or when the first pipe temperature is higher than the second pipe temperature and the operating state includes a heating state, it is determined that the leakage state is a leaked state.

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

[0018] If the first deviation value is greater than a preset reference deviation value, sampling is performed within a preset time period to obtain at least one third pipeline temperature, and a second deviation value is obtained according to the third pipeline temperature;

[0019] The determining the leakage state of the indoor unit according to each of the first deviation values ​​and the operating state of the indoor unit includes:

[0020] The leakage state of the indoor unit is determined according to each of the second deviation values ​​and the operating state of the indoor unit.

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

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

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

[0024] The difference between the first average value and the second average value of each target indoor unit is calculated to obtain a corresponding second deviation value.

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

[0026] 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 to access the controller of the indoor unit;

[0027] A first resistor is connected in series between the first differential pin and the first connection terminals of the plurality of indoor units;

[0028] A second resistor is connected in series between the second differential pin and the second connection terminals of the plurality of indoor units;

[0029] a third resistor, a first end of which is connected to the first differential pin;

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

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

[0032] A first electrostatic tube, connected in series between the first terminal and the ground;

[0033] The second electrostatic tube is connected in series between the second terminal and the ground.

[0034] The present invention also proposes an air conditioner, comprising an outdoor unit and multiple indoor units, wherein the outdoor unit is electrically connected to the multiple indoor units respectively, and the multiple indoor units are connected to each other, and the indoor units include a controller for executing the above-mentioned refrigerant detection method.

[0035] The present invention also provides a storage medium storing the above-mentioned 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 implements the steps in the above-mentioned refrigerant detection method when executing the computer program.

[0037] In the technical solution of the present invention, multiple indoor units are interconnected and have the same operating status, so that any indoor unit in the air conditioner can determine at least one target indoor unit from the multiple indoor units, and utilize the principle that when the refrigerant leaks in the air conditioner, the working efficiency decreases, which will cause the pipe temperature of the refrigerant transmission pipeline to shift. The leakage status of the indoor unit is determined by the first deviation value between the first pipe temperature of the indoor unit and the second pipe temperature of each target indoor unit, as well as the operating status. Therefore, in large places such as large shopping malls or hotels, the refrigerant leakage of any indoor unit can be accurately judged, thereby improving the fault troubleshooting rate of the air conditioner and reducing the situation where the refrigerant leakage pipeline cannot be timely checked and replaced due to the volatile characteristics of some refrigerants. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0039] Figure 1 This is a schematic diagram of a process of an embodiment of a refrigerant detection method of the present invention;

[0040] Figure 2 This is a flow chart of an embodiment of step S100 in the present invention;

[0041] Figure 3 This is a flow chart of an embodiment of step S300 in the present invention;

[0042] Figure 4 It is a schematic diagram of the process of another embodiment of the refrigerant detection method of the present invention;

[0043] Figure 5 A schematic diagram of the structure of an air conditioner according to an embodiment of the present invention;

[0044] Figure 6 It is a circuit connection diagram of an embodiment of a communication circuit in the present invention.

[0045] Description of Figure Numbers:

[0046] Label name Label name 510 First terminal J1 Jumper cap 520 The second terminal TVS1~TVS2 The first electrostatic tube ~ the second electrostatic tube 530 Communication circuit R1~R3 First resistor to third resistor U1 Communication chip

[0047] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0050] The invention provides a refrigerant detection method which is applied to air conditioners.

[0051] Reference Figure 1 In one embodiment, the air conditioner includes a plurality of indoor units that are interconnected and in the same operating state, and the method includes:

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

[0053] When the air conditioner is used as a one-to-many system, it includes multiple indoor units as slave units, and an outdoor unit that provides a refrigerant transmission pipeline for each indoor unit. Since these indoor units share one outdoor unit for heat exchange, for a one-to-many air conditioner, the operating status of multiple indoor units is consistent at the same time.

[0054] In this embodiment, multiple indoor units are connected to each other for communication. Specifically, the indoor units can communicate with each other using a BMS (battery management system) circuit to transmit operation status data to each other. Thus, when the air conditioner is working, one indoor unit is used as the working subject, the target temperature set for the indoor unit is the first set temperature, and the indoor unit is communicated and data is transmitted with multiple indoor units other than the indoor unit to determine the indoor unit that matches the first set temperature, and the matching indoor unit is used as the target indoor unit.

[0055] The first set temperature of the indoor unit can be set through interactive components such as a touch screen, a keypad, a remote controller, etc., and can also be set through a host computer.

[0056] S200, calculating the difference between the current first pipe temperature of the indoor unit and the current second pipe 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 its internal pipes can be detected by the refrigerant sensor module carried by the indoor unit, and the troubleshooting is easy. However, the refrigerant transmission pipeline between the outdoor unit and the indoor unit has different lengths in different occasions and environments. Using the refrigerant sensor module to detect the pipeline requires adding multiple refrigerant sensors to one pipeline. The longer the refrigerant transmission pipeline, the more refrigerant sensors there are, the higher the cost, and the more interfaces the refrigerant sensors require. Therefore, in order to reduce costs, it is usually not considered to use refrigerant sensors to check the pipeline.

[0058] Since the use environment of one-to-many models is mostly shopping malls, hotels, and large indoor restaurants, the use environment of each indoor unit is roughly the same. Under the same model and the same set temperature, the pipe temperature difference of the refrigerant transmission pipeline is small. When the refrigerant leaks, it will affect the working efficiency of the indoor unit and reduce the working efficiency. In particular, the indoor unit connected to the leaking refrigerant transmission pipeline will have a worse temperature control effect than other indoor units. Therefore, in this embodiment, when leak detection is performed on multiple indoor units of the air conditioner, one indoor unit is used as the working body, and the existing pipe temperature sensor in the indoor unit is used to detect the first pipe temperature of the indoor unit. It can be understood that in the indoor unit, the pipe temperature sensor is usually arranged at the return air outlet or air outlet of the indoor unit, and is used to detect the temperature of the refrigerant transmission pipeline where the indoor unit is located.

[0059] The indoor unit obtains the first pipe temperature through the pipe temperature sensor, and determines the second pipe temperature corresponding to each target indoor unit according to the operating status data transmitted by each target indoor unit, and obtains at least one corresponding first deviation value by subtracting the first pipe temperature from each second pipe temperature and taking the absolute value.

[0060] S300: Determine the leakage state of the indoor unit according to each of the first deviation values ​​and the operating state of the indoor unit.

[0061] Although when the refrigerant leaks, it will affect the working efficiency of the indoor unit and reduce the working efficiency, there may be more than one executable operating state for the air conditioner. In a cooling and heating type air conditioner, there are at least two operating states, namely cooling and heating. Therefore, in this embodiment, when detecting the refrigerant leakage of the air conditioner, it is necessary not only to compare the indoor unit with the corresponding target indoor unit according to each first deviation value to determine whether one of the two has a leak, but also to obtain the operating state of the air conditioner to determine whether the indoor unit is leaking, thereby obtaining the leakage state of the indoor unit.

[0062] In the technical solution of the present invention, multiple indoor units are interconnected and have the same operating status, so that any indoor unit in the air conditioner can determine at least one target indoor unit from the multiple indoor units, and utilize the principle that when the refrigerant leaks in the air conditioner, the working efficiency decreases, which will cause the pipe temperature of the refrigerant transmission pipeline to shift. The leakage status of the indoor unit is determined by the first deviation value between the first pipe temperature of the indoor unit and the second pipe temperature of each target indoor unit, as well as the operating status. Therefore, in large places such as large shopping malls or hotels, the refrigerant leakage of any indoor unit can be accurately judged, thereby improving the fault troubleshooting rate of the air conditioner and reducing the situation where the refrigerant leakage pipeline cannot be timely checked and replaced due to the volatile characteristics of some refrigerants.

[0063] Furthermore, in the present invention, the air conditioner also includes an outdoor unit, which serves as a host computer, and its main function is to collect status data of the indoor unit and control whether the refrigerant is supplied. The outdoor unit and each indoor unit use current loop communication, and the refrigerant transmission pipeline of each indoor unit corresponds to its communication line one by one. Therefore, the outdoor unit only needs to process and control the data signal sent by the indoor unit. When it is determined that the indoor unit represented by the data signal is a faulty indoor unit based on the received data signal, the indoor unit is controlled to start the air supply mode to prevent the indoor refrigerant concentration from being too high. At the same time, the expansion valve of the corresponding refrigerant transmission pipeline is controlled to stop the refrigerant supply of the faulty indoor unit until the maintenance personnel completes the maintenance, and then repeat the above steps by themselves, sampling, analyzing the data, and checking for abnormalities, and then cancel the sending of the fault signal.

[0064] Reference Figure 2 In one embodiment, for any of the indoor units in the air conditioner, determining at least one target indoor unit from the air conditioner that matches the current set temperature of the indoor unit includes:

[0065] S110, for any of the indoor units in the air conditioner, obtaining a second set temperature of the other indoor units in the air conditioner except the indoor unit;

[0066] S120: Determine at least one target indoor unit 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 credible, or in other words, to more accurately reflect the offset of the pipe temperature of the refrigerant transmission pipeline between the two indoor units, in the present embodiment, when the air conditioner is working, one indoor unit is used as the working body, and when matching the indoor unit with multiple indoor units other than the indoor unit, the 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 other indoor units other than the indoor unit. If there is an indoor unit with the same second set temperature as the first set temperature, the corresponding indoor unit is used as the target indoor unit.

[0068] Taking BMS circuit communication as an example, corresponding identification information, such as address, serial number, etc., is stored in each indoor unit for mutual identification and communication between indoor units. During operation, an indoor unit requests data from other indoor units except the indoor unit through the BMS circuit to receive return signals from other indoor units. The format of the return signal is: start bit + indoor unit address + second set temperature + pipe temperature + end bit. When the second set temperature is obtained according to the return signal, the second set temperature is matched with the first set temperature of the indoor unit. After matching the target indoor unit with the same first set temperature, the corresponding indoor unit address is recorded, and only the data sent by the target indoor unit is received and analyzed later.

[0069] Reference Figure 3 In one embodiment, determining the leakage state of the indoor unit according to each of the first deviation values ​​and the operating state of the indoor unit includes:

[0070] S310, if the first deviation value is greater than a preset reference deviation value, compare the first pipeline temperature with the second pipeline temperature to obtain a comparison result;

[0071] S320: Determine the leakage state of the indoor unit according to the comparison result and the operating state.

[0072] In this embodiment, the reference deviation value is set according to the average deviation value obtained in the leakage experiment of the indoor unit. Specifically, when the indoor unit detects that the first deviation value is greater than the reference deviation value, it means that there is an indoor unit leakage between the indoor unit and the target indoor unit 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 values ​​of the two, so as to determine whether the indoor unit is leaking according to the comparison result and the operating state of the indoor unit, thereby obtaining the leakage state of the indoor unit.

[0073] Specifically, determining the leakage state of the indoor unit according to the comparison result and the operating state includes:

[0074] When the first pipe temperature is greater than the second pipe temperature and the operating state includes a cooling state, or when the first pipe temperature is less than the second pipe temperature and the operating state includes a heating state, determining that the leakage state is a non-leakage state;

[0075] When the first pipe temperature is lower than the second pipe temperature and the operating state includes a cooling state, or when the first pipe temperature is higher than the second pipe temperature and the operating state of the indoor unit includes a heating state, the leakage state is determined to be a leaked state.

[0076] In this embodiment, the reference deviation value is 3.5°C, the first pipe temperature is 20°C, and the second pipe temperature is 24°C. At this time, the calculated first deviation value is 4°C, which is greater than 3.5°C. 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 the heating state at this time, it is considered that the indoor unit is in a leaking state; if the indoor unit is in the cooling state at this time, it is considered that the indoor unit is not in a leaking state.

[0077] In one embodiment, before determining the leakage state of the indoor unit according to each of the first deviation values ​​and the operating state of the indoor unit, the method further includes:

[0078] S400: If the first deviation value is greater than a preset reference deviation value, sampling and obtaining at least one third pipeline temperature within a preset time period, and obtaining a second deviation value according to the third pipeline temperature;

[0079] The determining the leakage state of the indoor unit according to each of the first deviation values ​​and the operating state of the indoor unit includes:

[0080] S330: Determine the leakage state of the indoor unit according to each of the second deviation values ​​and the operating state of the indoor unit.

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

[0082] Specifically, the preset duration is set by the R&D personnel according to actual needs, such as 5 minutes, 15 minutes or other shorter time.

[0083] Within a preset time period, a second deviation value can be calculated based on a third pipe temperature, and the second deviation value can be compared with a reference deviation value, and the leakage state of the indoor unit can be determined based on the second deviation value and the operating state of the indoor unit; multiple second deviation values ​​can also be calculated based on multiple third pipe temperatures, and the leakage state of the indoor unit can be determined based on the number of second deviation values ​​greater than the reference deviation value and the operating state of the indoor unit; the average value of multiple third pipe temperatures can also be calculated, and the leakage state of the indoor unit can be determined based on the average value and the operating state of the indoor unit, and so on.

[0084] Reference Figure 4 In one embodiment, sampling to obtain at least one third pipe temperature within a preset time period, and obtaining a second deviation value according to the third pipe temperature includes:

[0085] S410, sampling according to a preset sampling interval and a preset sampling number to obtain a temperature of at least one third pipeline of the indoor unit;

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

[0087] S430: Calculate the difference between the first average value and the second average value of each target indoor unit to obtain a corresponding second deviation value.

[0088] In this embodiment, the preset sampling interval and the preset sampling number are set by the R&D personnel according to actual needs. The preset sampling interval is set to 3 minutes and the preset sampling number is set to 5 times as an example for explanation:

[0089] After detecting that the first deviation value is greater than the preset reference deviation value, the indoor unit enters the sampling mode, and samples once every 3 minutes within the preset time of 15 minutes, records the sampled third pipe temperature and counts. When the count reaches 5 times, the indoor unit calculates the first average value of the third pipe temperature collected 5 times, and calculates the second deviation value based on the first average value and the second average value of each target indoor unit. If the calculation result is still greater than the reference deviation value, the leakage state of the indoor unit is determined based on the above-mentioned operating state, so as to reduce the error caused by the initial judgment.

[0090] Reference Figure 5 and Figure 6 In one embodiment, the plurality of indoor units are connected to each other through a communication circuit 530, and the communication circuit 530 includes:

[0091] The 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, wherein the first communication pin, the second communication pin, and the communication enable pin are respectively used to access the controller of the indoor unit;

[0092] A first resistor R1 is connected in series between the first differential pin and the first connection terminals 510 of the plurality of indoor units;

[0093] A second resistor R2 is connected in series between the second differential pin and the second connection terminals 520 of the plurality of indoor units;

[0094] A third resistor R3, a first end of which is connected to the first differential pin;

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

[0096] In this embodiment, CN1 and CN2 are communication interfaces of the indoor unit, and each communication interface includes at least two engineering connection terminals for connecting the communication line, the first connection terminal 510 and the second connection terminal 520. Since the communication circuit 530 is a plurality of parallel connections for communication, according to the equivalent calculation formula of parallel resistance, it can be concluded that if resistors of the same resistance value are infinitely connected in parallel, their equivalent resistance will infinitely approach 0.

[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 many terminal resistors (that is, the third resistor R3, which is mainly used for signal reflection and echo), it is necessary to add a jumper cap J1 to realize the connection and disconnection of the terminal resistors.

[0098] Reference Figure 5 and Figure 6 In one embodiment, the communication circuit 530 further includes:

[0099] A 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 this embodiment, the first electrostatic tube TVS1 and the second electrostatic tube TVS2 are directly connected to the terminals of other indoor units to release static electricity entering the circuit to prevent static electricity from damaging the circuit.

[0102] The present invention also proposes a storage medium, which stores the above-mentioned refrigerant detection method. The specific structure of the refrigerant detection method refers to the above-mentioned embodiment. Since this storage medium adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0103] The present invention also proposes an air conditioner, which includes an outdoor unit and multiple indoor units, the outdoor units are electrically connected to the multiple indoor units, the multiple indoor units are connected to each other, the indoor units include a controller for executing the above-mentioned refrigerant detection method, and the specific structure of the refrigerant detection method refers to the above-mentioned embodiment. Since the air conditioner adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0104] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A refrigerant detection method, applied to air conditioners, characterized in that: The air conditioner comprises a plurality of indoor units which are in communication with each other and have the same operating status, and the method comprises: For any of the indoor units in the air conditioner, determining at least one target indoor unit from the air conditioner that matches the first set temperature of the indoor unit; Calculate the difference between the current first pipe temperature of the indoor unit and the current second pipe temperature of each target indoor unit to obtain at least one first deviation value; The leakage state of the indoor unit is determined according to each of the first deviation values ​​and the operating state of the indoor unit.

2. The refrigerant detection method according to claim 1, characterized in that: For any of the indoor units in the air conditioner, determining at least one target indoor unit from the air conditioner that matches the current set temperature of the indoor unit includes: For any of the indoor units in the air conditioner, obtaining the second set temperature of the other indoor units in the air conditioner except the indoor unit; At least one target indoor unit is determined from the other indoor units according to the first set temperature and the second set temperature.

3. The refrigerant detection method according to claim 1, characterized in that: The determining the leakage state of the indoor unit according to each of the first deviation values ​​and the operating state of the indoor unit includes: If the first deviation value is greater than a preset reference deviation value, comparing the first pipe temperature with the second pipe temperature to obtain a comparison result; The leakage state of the indoor unit is determined according to the comparison result and the operating state.

4. The refrigerant detection method according to claim 3, characterized in that: Determining the leakage state of the indoor unit according to the comparison result and the operating state includes: When the first pipe temperature is greater than the second pipe temperature and the operating state includes a cooling state, or when the first pipe temperature is less than the second pipe temperature and the operating state includes a heating state, determining that the leakage state is a non-leakage state; When the first pipe temperature is lower than the second pipe temperature and the operating state includes a cooling state, or when the first pipe temperature is higher than the second pipe temperature and the operating state includes a heating state, it is determined that the leakage state is a leaked state.

5. The refrigerant detection method according to claim 1, characterized in that: Before determining the leakage state of the indoor unit according to each of the first deviation values ​​and the operating state of the indoor unit, the method further includes: If the first deviation value is greater than a preset reference deviation value, sampling is performed within a preset time period to obtain at least one third pipeline temperature, and a second deviation value is obtained according to the third pipeline temperature; The determining the leakage state of the indoor unit according to each of the first deviation values ​​and the operating state of the indoor unit includes: The leakage state of the indoor unit is determined according to each of the second deviation values ​​and the operating state of the indoor unit.

6. The refrigerant detection method according to claim 5, characterized in that: The sampling within a preset time period to obtain at least one third pipeline temperature, and obtaining a second deviation value according to the third pipeline temperature, includes: Sampling according to a preset sampling interval and a preset sampling number of times to obtain a temperature of at least one third pipeline of the indoor unit; Calculating a first average value of the temperature of at least one of the third pipes; The difference between the first average value and the second average value of each target indoor unit is calculated to obtain the corresponding second deviation value.

7. The refrigerant detection method according to claim 1, characterized in that: The plurality of indoor units are connected to each other through a communication circuit, and the communication circuit includes: 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 to access the controller of the indoor unit; A first resistor is connected in series between the first differential pin and the first connection terminals of the plurality of indoor units; A second resistor is connected in series between the second differential pin and the second connection terminals of the plurality of indoor units; a third resistor, a first end of which is connected to the first differential pin; A jumper cap is connected in series between the second end of the third resistor and the first end of the second resistor.

8. The refrigerant detection method according to claim 7, characterized in that: The communication circuit further comprises: A first electrostatic tube, connected in series between the first terminal and the ground; The second electrostatic tube is connected in series between the second terminal and the ground.

9. An air conditioner, characterized in that: It comprises an external machine and a plurality of internal machines, wherein the external machine is electrically connected to the plurality of internal machines respectively, and the plurality of internal machines are connected to each other, and the internal machine comprises a controller for executing the refrigerant detection method as described in any one of claims 1 to 8.

10. A storage medium, characterized in that: The refrigerant detection method according to any one of claims 1 to 8 is stored.

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