Control method and control device for refrigerant leakage of multi-connected air conditioning system

Abstract

The present application relates to a kind of multi-connected air conditioning system explosive refrigerant leakage control method and control device, the method includes: the air conditioning system includes outdoor unit and multiple indoor units, the method includes: obtaining the first refrigerant concentration of outdoor unit and the second refrigerant concentration corresponding to multiple indoor units;Based on the first refrigerant concentration, the severity of outdoor unit refrigerant leakage is obtained;Based on the severity of outdoor unit refrigerant leakage, corresponding operation is carried out on outdoor unit;Based on the second refrigerant concentration corresponding to indoor unit, the information of indoor unit refrigerant leakage is obtained;Based on the information of indoor unit refrigerant leakage, corresponding operation is carried out on corresponding indoor unit. By real-time acquisition of the refrigerant concentration of outdoor unit and multiple indoor units, the severity of refrigerant leakage can be quickly found and accurately evaluated, thereby reducing the security risk. The present application can quickly respond to refrigerant leakage events and effectively prevent explosions caused by high refrigerant concentration, significantly improving the safety of air conditioning system.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, specifically providing a method and device for controlling the leakage of explosive refrigerant in a multi-split air conditioning system. Background Technology

[0002] In order to improve environmental performance, many manufacturers have begun to use environmentally friendly refrigerants with explosive properties as refrigerants in existing air conditioning technology.

[0003] However, once these refrigerants leak, due to their chemical properties, they can rapidly accumulate in a certain area, forming a high concentration of refrigerant gas. When these high concentrations of refrigerant gas meet specific environmental conditions, they may form an explosive cloud and trigger an explosion, thus creating a safety hazard for the air conditioning system.

[0004] Accordingly, there is a need in the field for a new control scheme for the leakage of explosive refrigerants to solve the above problems. Summary of the Invention

[0005] In order to overcome the above-mentioned defects, the present invention is proposed to provide a solution or at least a partial solution to the problem that the leakage of explosive refrigerants in the prior art can easily cause safety hazards.

[0006] In a first aspect, the present invention provides a method for controlling refrigerant leakage in a multi-split air conditioning system. The method includes: the air conditioning system comprising an outdoor unit and multiple indoor units; the method comprising: acquiring a first refrigerant concentration of the outdoor unit and a second refrigerant concentration corresponding to each of the multiple indoor units; determining the severity of refrigerant leakage in the outdoor unit based on the first refrigerant concentration; performing corresponding operations on the outdoor unit based on the severity of the refrigerant leakage; obtaining information on refrigerant leakage in the indoor units based on the second refrigerant concentration corresponding to each indoor unit; and performing corresponding operations on the indoor units based on the information on the refrigerant leakage in the indoor units.

[0007] As an alternative or supplement to the above solutions, in a method according to an embodiment of the present invention, the severity of refrigerant leakage in the outdoor unit includes: a first severity level, "based on the first refrigerant concentration, the severity of refrigerant leakage in the outdoor unit is obtained", which includes: obtaining a preset first concentration threshold; comparing the first refrigerant concentration with the preset first concentration threshold; if the first refrigerant concentration is greater than or equal to the preset first concentration threshold, then the outdoor unit is determined to be in the first severity level; if the severity of refrigerant leakage in the outdoor unit is the first severity level, then a first alarm is issued, the outdoor unit fan is controlled to rotate to discharge the refrigerant in the outdoor unit, and the outdoor unit liquid pipe shut-off valve and gas pipe shut-off valve are controlled to close.

[0008] As an alternative or supplement to the above solutions, in a method according to an embodiment of the present invention, the severity of refrigerant leakage in the outdoor unit further includes: a second severity level; if the first refrigerant concentration is less than a preset first concentration threshold, then the second severity level is obtained.

[0009] As an alternative or supplement to the above solutions, in a method according to an embodiment of the present invention, the information on refrigerant leakage of the indoor unit includes: the severity of the refrigerant leakage of the indoor unit and the number of indoor units that have experienced refrigerant leakage, wherein the severity of the refrigerant leakage of the indoor unit includes a third severity level; "obtaining the information on refrigerant leakage of the indoor unit based on the second refrigerant concentration corresponding to the indoor unit" includes: obtaining a preset second concentration threshold; comparing the preset second concentration threshold with the second refrigerant concentration corresponding to the indoor unit to obtain the severity of the refrigerant leakage of the corresponding indoor unit and the number of indoor units that have experienced refrigerant leakage; "performing corresponding operations on the corresponding indoor units based on the information on refrigerant leakage of the indoor units" includes: performing corresponding operations on the corresponding indoor units based on the severity of the refrigerant leakage of the indoor units and the number of indoor units that have experienced refrigerant leakage.

[0010] As an alternative or supplement to the above solutions, in a method according to an embodiment of the present invention, "obtaining the severity of refrigerant leakage of the corresponding indoor unit" includes: if the second refrigerant concentration of the indoor unit is greater than or equal to a preset second concentration threshold, then obtaining the third severity of the corresponding indoor unit; "based on the severity of refrigerant leakage of the indoor unit and the number of indoor units that have experienced refrigerant leakage, performing corresponding operations on the corresponding indoor units" includes: obtaining a preset first number threshold; if the number of indoor units with a refrigerant leakage severity of the third severity is less than or equal to the preset first number threshold, then issuing a second alarm and controlling the operation of the fan of the indoor unit with a refrigerant leakage severity of the third severity to reduce the refrigerant concentration in the indoor unit.

[0011] As an alternative or supplement to the above solution, the method according to an embodiment of the present invention further includes: if the number of indoor units with a refrigerant leakage severity level of the third severity level is greater than a preset first number threshold, then a third alarm is issued, the fan of the indoor unit with a refrigerant leakage severity level of the third severity level is controlled to operate to reduce the refrigerant concentration in the indoor unit, and the outdoor unit is controlled to close the liquid pipe shut-off valve, and when the compressor is operated and the preset conditions are met, the compressor is stopped and the gas pipe shut-off valve is closed.

[0012] As an alternative or supplement to the above solutions, in a method according to an embodiment of the present invention, "operating the compressor until a preset condition is reached, stopping the operation of the compressor and closing the tracheal shut-off valve" includes: obtaining the internal pressure of the tracheal tube and a preset pressure threshold; when the internal pressure of the tracheal tube is less than or equal to the preset pressure threshold, stopping the operation of the compressor and closing the tracheal shut-off valve.

[0013] In a second aspect, a control device is provided, comprising a processor and a storage device, the storage device being adapted to store a plurality of computer programs, the computer programs being adapted to be loaded and run by the processor to execute the control method for controlling the leakage of explosive refrigerant in a multi-split air conditioning system as described in any of the above-described technical solutions.

[0014] In a third aspect, a computer-readable storage medium is provided, wherein a plurality of computer programs are stored therein, the computer programs being adapted to be loaded and run by a processor to perform the control method for explosive refrigerant leakage in a multi-split air conditioning system as described in any of the above-described technical solutions.

[0015] In a fourth aspect, an air conditioning system is provided, including a control device that operates to perform the control method for controlling refrigerant leakage in a multi-split air conditioning system as described in any of the above-described technical solutions.

[0016] The above-described technical solutions of the present invention have at least one or more of the following beneficial effects:

[0017] In implementing the technical solution of this invention, by acquiring the refrigerant concentration of the outdoor unit and multiple indoor units in real time, the severity of refrigerant leakage can be quickly detected and accurately assessed, thereby reducing safety hazards. By judging the severity of the refrigerant leakage, precise control can be exercised over the refrigerant leakage situation in both indoor and outdoor units, effectively reducing the safety risks following a refrigerant leak. This solution can respond quickly to refrigerant leak events and effectively prevent explosions caused by excessively high refrigerant concentrations, significantly improving the safety of air conditioning systems. Attached Figure Description

[0018] The disclosure of this invention will become more readily understood with reference to the accompanying drawings. It will be readily understood by those skilled in the art that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. Furthermore, similar numbers in the drawings are used to denote similar components, wherein:

[0019] Figure 1 This is a schematic flowchart of the main steps of a method for controlling the leakage of explosive refrigerant in a multi-split air conditioning system according to an embodiment of the present invention;

[0020] Figure 2 This is a flowchart illustrating the secondary steps of a method for controlling the leakage of explosive refrigerant in a multi-split air conditioning system according to an embodiment of the present invention.

[0021] Figure 3This is a flowchart illustrating the secondary steps of a method for controlling the leakage of explosive refrigerant in a multi-split air conditioning system according to an embodiment of the present invention. Detailed Implementation

[0022] Some embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0023] In the description of this invention, "module" and "processor" can include hardware, software, or a combination of both. A module can include hardware circuitry, various suitable sensors, communication ports, memory, and may also include software components, such as computer programs, or a combination of software and hardware. A processor can be a central processing unit, microprocessor, image processor, digital signal processor, or any other suitable processor. The processor has data and / or signal processing capabilities. The processor can be implemented in software, in hardware, or a combination of both. Non-transitory computer-readable storage media includes any suitable medium capable of storing computer programs, such as magnetic disks, hard disks, optical disks, flash memory, read-only memory, random access memory, etc. The term "A and / or B" means all possible combinations of A and B, such as only A, only B, or A and B. The terms "at least one A or B" or "at least one of A and B" have a similar meaning to "A and / or B" and can include only A, only B, or A and B. The singular terms "a" or "this" can also include plural forms.

[0024] Here we will first explain some of the terms involved in this invention.

[0025] Explosive refrigerants: Explosive refrigerants refer to a class of coolants that can explode under conditions such as high temperature, high pressure, or ignition. Examples include propane (R290), isobutane (R600a), and R32. Although these refrigerants have excellent cooling performance and are less harmful to the environment, their flammable and explosive properties require special attention during use and storage.

[0026] See appendix Figure 1 , Figure 1 This is a schematic flowchart illustrating the main steps of a method for controlling the leakage of explosive refrigerant in a multi-split air conditioning system according to an embodiment of the present invention. Figure 1 As shown, the method for controlling the leakage of explosive refrigerant in a multi-split air conditioning system in this embodiment of the invention mainly includes the following steps S10-S50.

[0027] Step S10: Obtain the first refrigerant concentration of the outdoor unit and the second refrigerant concentration of the multiple indoor units.

[0028] In this embodiment, the air conditioning system includes an outdoor unit and multiple indoor units.

[0029] In one implementation, by acquiring the first refrigerant concentration of the outdoor unit and the second refrigerant concentration of each indoor unit, the presence of refrigerant leakage can be detected, and the severity of the leakage can be determined. This step forms the basis for subsequent control strategy development.

[0030] The first refrigerant concentration here refers to the refrigerant concentration inside the outdoor unit after mixing with ambient air, reflecting the refrigerant leakage status of the outdoor unit. The second refrigerant concentration refers to the refrigerant concentration inside each indoor unit after mixing with ambient air, reflecting the refrigerant leakage status of each indoor unit. By comparing these two concentrations, the location of the refrigerant leak can be determined, allowing for targeted subsequent actions.

[0031] The purpose of this step is to obtain information about the refrigerant leak, which is the foundation for subsequent steps in controlling the refrigerant leak. Only by knowing the location and severity of the leak can effective refrigerant leak control be implemented.

[0032] Step S20: Based on the first refrigerant concentration, determine the severity of refrigerant leakage in the outdoor unit.

[0033] In this embodiment, the severity of refrigerant leakage in the outdoor unit includes: a first severity level and a second severity level.

[0034] In one implementation, by comparing the first refrigerant concentration with a preset first concentration threshold, the severity of refrigerant leakage in the outdoor unit can be divided into two levels: first severity and second severity.

[0035] The first severity level refers to a refrigerant leak exceeding a preset first concentration threshold. In this case, immediate measures are required to control the refrigerant leak and prevent more serious consequences. The second severity level refers to a refrigerant concentration below the preset first concentration threshold. This means that although there may be some refrigerant leakage in the system, its extent has not reached the preset critical value, and no emergency control measures are required.

[0036] In this embodiment, the corresponding judgment is made through steps S201-S204, such as... Figure 2 As shown, the details are as follows:

[0037] Step S201: Obtain the preset first concentration threshold.

[0038] In this embodiment, the first concentration threshold is a preset parameter.

[0039] In one implementation, a first concentration threshold represents the boundary of the severity of refrigerant leakage. If the refrigerant concentration reaches or exceeds this threshold, the refrigerant leakage can be considered to have reached the first level of severity, at which point relevant control measures need to be implemented immediately.

[0040] Step S202: Compare the magnitude of the first refrigerant concentration with the preset first concentration threshold.

[0041] In this embodiment, the system compares the first refrigerant concentration of the outdoor unit with a preset first concentration threshold to determine the severity of the refrigerant leak.

[0042] In one implementation, to accurately compare the first refrigerant concentration and the first concentration threshold, it is first necessary to ensure that their units are consistent. If the units are inconsistent, for example, one is a volume ratio and the other is a mass ratio, then unit conversion is required. Furthermore, to reduce errors, this comparison process may need to be repeated multiple times to obtain more stable and accurate results.

[0043] After comparing the magnitude of the first refrigerant concentration with the first concentration threshold, the system will make a preliminary judgment on refrigerant leakage.

[0044] Step S203: If the first refrigerant concentration is greater than or equal to the preset first concentration threshold, the outdoor unit is determined to be of the first severity level.

[0045] In one implementation, once the system determines that the refrigerant concentration in the outdoor unit is greater than or equal to a preset first concentration threshold, it classifies the refrigerant leak as having reached the first severity level. At this point, this interim result is based on a comparison with a preset threshold, which is considered a signal indicating that the refrigerant leak has reached an emergency state. Continued leakage leading to an increase in concentration poses a risk of explosion.

[0046] Step S204: If the concentration of the first refrigerant is less than the preset first concentration threshold, then the second severity level is obtained.

[0047] In this embodiment, if the detected refrigerant concentration is less than a preset first concentration threshold, the system will classify it as a second level of severity. This definition means that although there is a refrigerant leak, its severity has not reached the emergency threshold; therefore, the equipment is not currently in an explosive state.

[0048] Step S30: Perform appropriate operations on the outdoor unit based on the severity of the refrigerant leak.

[0049] In this embodiment, the outdoor unit is operated accordingly based on the severity of the refrigerant leakage obtained in the previous steps.

[0050] In one implementation, the specific operation is performed through step S301, as follows:

[0051] Step S301: If the severity of the refrigerant leak in the outdoor unit is the highest level, then issue the first alarm, control the outdoor unit fan to rotate to discharge the refrigerant in the outdoor unit, and control the liquid pipe shut-off valve and gas pipe shut-off valve of the outdoor unit to close.

[0052] In this embodiment, the severity of the refrigerant leak is determined to be of the highest severity. At this point, a safety risk is involved, and the system will immediately take measures to control and manage the situation.

[0053] In one implementation, the system first issues an initial alarm. This alarm may be issued through the system's control panel, user interface, or remote notification (such as a mobile application), with the aim of quickly informing operators, users, or maintenance personnel of a serious refrigerant leak in the air conditioning system. The initial alarm can take various forms, such as audible alarms or visual alarms (e.g., flashing lights or warning messages on a display screen), to ensure it attracts attention.

[0054] Next, the control system will drive the outdoor unit's fan to rotate and expel the refrigerant from inside the unit. This is because the refrigerant exists in a high-pressure state inside the outdoor unit, and if it leaks, it could cause injury or even an explosion. By controlling the fan's rotation, the refrigerant can be quickly expelled from the outdoor unit, thus reducing this risk.

[0055] Simultaneously, the system also controls the closure of the liquid line shut-off valve and the gas line shut-off valve on the outdoor unit. The liquid line and gas line are important channels connecting the indoor and outdoor units, through which refrigerant flows. When a refrigerant leak occurs, closing these two shut-off valves cuts off the refrigerant flow, trapping a portion of the refrigerant in the compressor and preventing further leakage from the system.

[0056] This operation can effectively control the severity of refrigerant leaks, reduce the potential impact of leaked refrigerant on the environment and personnel, and also provide conditions for subsequent maintenance work.

[0057] Step S40: Based on the second refrigerant concentration corresponding to the indoor unit, obtain information on refrigerant leakage in the indoor unit.

[0058] In this embodiment, the information on refrigerant leakage in the indoor unit includes: the severity of the refrigerant leakage in the indoor unit and the number of indoor units that have experienced refrigerant leakage, wherein the severity of the refrigerant leakage in the indoor unit includes a third severity level.

[0059] In one implementation, the system obtains information about refrigerant leaks by analyzing and processing the second refrigerant concentration corresponding to each indoor unit. In a multi-indoor-unit air conditioning system, each indoor unit can potentially be a source of refrigerant leakage, making this step crucial for detecting and locating refrigerant leaks.

[0060] First, the system acquires the refrigerant concentration for each indoor unit. This information is typically provided by refrigerant sensors or detection devices within the indoor units, which monitor and record the refrigerant concentration in real time and transmit the data to the control system. Since there are multiple indoor units, data needs to be collected individually to ensure that the refrigerant concentration data for each unit is accurately acquired and recorded.

[0061] Next, based on the collected refrigerant concentration data, the system can determine whether there is a refrigerant leak in the indoor unit and the severity of the leak. Specifically, this can be determined by comparing the refrigerant concentration with a preset threshold. If the refrigerant concentration in the indoor unit exceeds this threshold, a refrigerant leak is confirmed. Furthermore, comparing the refrigerant concentrations of different indoor units can also help identify potential leak sources.

[0062] In this embodiment, the relevant determination is performed through steps S401-S402.

[0063] Step S401: Obtain the preset second concentration threshold.

[0064] In this embodiment, the preset second concentration threshold is set based on factors such as refrigerant characteristics, indoor unit design, and operating parameters. It represents a safe range for refrigerant concentration. When the refrigerant concentration in the indoor unit exceeds this threshold, the system will determine that there is a risk of refrigerant leakage.

[0065] Step S402: Compare the preset second concentration threshold with the second refrigerant concentration corresponding to the indoor unit to obtain the severity of refrigerant leakage of the corresponding indoor unit and the number of indoor units that have experienced refrigerant leakage.

[0066] In one implementation, refrigerant concentration is independently measured for each indoor unit. The refrigerant concentration obtained from each indoor unit is compared with a preset second concentration threshold. The comparison result is used to accurately assess the severity of refrigerant leakage in each indoor unit. Simultaneously, this process can also determine the number of indoor units that have experienced refrigerant leakage. In this way, a detailed understanding of the specific circumstances of the refrigerant leakage can be obtained, including its severity and the extent of its impact.

[0067] It's important to note that the preset second refrigerant concentration threshold is a crucial reference standard. If the refrigerant concentration in the indoor unit exceeds this threshold, it indicates a risk of refrigerant leakage. Furthermore, the degree to which the refrigerant concentration exceeds the threshold can also be used to assess the severity of the leak. For example, the higher the refrigerant concentration exceeds the threshold, the more severe the leak.

[0068] In this embodiment, the determination is made through steps S402-1 to S402-2, such as... Figure 3 As shown, the details are as follows:

[0069] Step S402-1: If the second refrigerant concentration of the indoor unit is greater than or equal to the preset second concentration threshold, then the third severity level of the corresponding indoor unit is obtained.

[0070] In one implementation, if the refrigerant concentration of a certain indoor unit exceeds or equals a preset second concentration threshold, then the refrigerant leakage of that indoor unit will be judged as the third severity level.

[0071] In this embodiment, the third severity level indicates that the refrigerant leak is quite serious and may affect personnel safety. This result is obtained by comparing the actual refrigerant concentration with a preset threshold. If the actual refrigerant concentration is higher than or equal to the threshold, it means that the indoor unit may have a large amount of refrigerant leakage, requiring further processing.

[0072] Step S402-2: If the second refrigerant concentration of the indoor unit is less than the preset second concentration threshold, then the fourth severity level of the corresponding indoor unit is obtained.

[0073] In one implementation, if the refrigerant concentration in the indoor unit is lower than a preset second concentration threshold, then the refrigerant leakage of this indoor unit is classified as fourth severity. Fourth severity indicates that the refrigerant leakage is relatively minor, possibly just normal wear and tear on the equipment or a small-scale leak, with minimal impact on personnel and equipment.

[0074] Both of these steps can quickly reveal the refrigerant leak, providing a basis for subsequent handling.

[0075] Step S50: Perform corresponding operations on the indoor unit based on the information about refrigerant leakage in the indoor unit.

[0076] In this embodiment, based on the previously obtained refrigerant leakage information of the indoor unit, corresponding operations will be performed on the indoor unit with a severe leak. The purpose of these operations is to prevent the refrigerant leakage from worsening and to ensure the safety of equipment and personnel.

[0077] In one implementation, the corresponding operation of the indoor unit is achieved through step S501.

[0078] Step S501: Based on the severity of the refrigerant leak in the indoor unit and the number of indoor units that have experienced refrigerant leaks, perform corresponding operations on the corresponding indoor units.

[0079] In one implementation, the corresponding operations are performed through steps S501-1 to S501-3.

[0080] Step S501-1: Obtain the preset first number threshold.

[0081] Step S501-2: If the number of indoor units with refrigerant leakage severity level 3 is less than or equal to the preset first number threshold, then issue a second alarm and control the operation of the indoor unit fan with refrigerant leakage severity level 3 to reduce the refrigerant concentration in the indoor unit.

[0082] In one implementation, if the number of indoor units with a refrigerant leak severity level of 3 is less than or equal to a preset first threshold, the system will issue a second alarm. The second alarm aims to notify relevant personnel or equipment of the refrigerant leak. The alarm may take the form of sound, light, electronic message, or other methods that effectively convey information.

[0083] Next, the control system will operate on the indoor units with refrigerant leak severity level three. Here, the control system will instruct the fans of these indoor units to operate, helping to reduce the refrigerant concentration in the indoor units. The operation of the fans promotes airflow, helping to dilute the refrigerant inside the indoor units, thereby reducing the refrigerant concentration. By operating the fans, the refrigerant concentration can be reduced immediately, thus reducing the risk of refrigerant explosion.

[0084] To illustrate, suppose a central air conditioning system has 10 indoor units in operation. The system detects that the refrigerant concentration in two of these units has reached the third severity level, while the preset first threshold number is set to 3. In this case, the number of indoor units with refrigerant leaks (i.e., 2 units) is less than or equal to the preset first threshold number (i.e., 3 units). The system will then perform the aforementioned operation: issue a second alarm and control the fan operation of the indoor units with refrigerant leak severity at the first severity level.

[0085] In this example, although only two indoor units had refrigerant concentrations reaching the third severity level, because the number of these two indoor units was less than the preset first threshold, the system chose to allow the other indoor units to continue operating to prevent the overall system performance from being excessively affected. Simultaneously, the fans in the two leaking indoor units were controlled to reduce the internal refrigerant concentration and avoid safety issues caused by excessively high refrigerant concentrations.

[0086] Step S501-3: If the number of indoor units with refrigerant leakage severity level 3 is greater than the preset first number threshold, then issue a third alarm, control the operation of the indoor unit fan with refrigerant leakage severity level 3 to reduce the refrigerant concentration in the indoor unit, and control the outdoor unit to close the liquid pipe shut-off valve, operate the compressor and when the preset conditions are met, stop the compressor and close the gas pipe shut-off valve.

[0087] In one implementation, if the number of indoor units with a refrigerant leak severity level of 3 exceeds a preset first threshold, the system will issue a third alarm. This indicates that the refrigerant leak is quite serious and may pose a serious threat to the system's operational performance and equipment safety. Preferably, in this implementation, the third alarm is a higher-level alarm, which sends a strong warning to maintenance or operating personnel through sound, light, or electronic messages.

[0088] The control system then operates on indoor units with refrigerant leakage severity level three. This operation includes controlling the fan operation of these indoor units to reduce the refrigerant concentration. Preferably, in this embodiment, the fan operates at its highest frequency to generate a larger airflow, ensuring that the refrigerant in the indoor units can be quickly and effectively discharged, preventing the refrigerant concentration from increasing further.

[0089] Simultaneously, the control system operates the outdoor unit. This operation includes closing the liquid line shut-off valve and running the compressor. At this point, due to the severity of the refrigerant leak, the control system needs to ensure that the outdoor unit no longer supplies new refrigerant to the indoor unit to avoid further exacerbating the leak. Therefore, the control system closes the liquid line shut-off valve, disconnecting the refrigerant supply between the indoor and outdoor units. At the same time, the control system also runs the compressor to recover as much remaining refrigerant as possible back into the outdoor unit. Once preset conditions are met, the control system stops the compressor and closes the gas line shut-off valve.

[0090] This series of operational steps aims to ensure the system's operational efficiency and equipment safety. In the event of a serious refrigerant leak, it minimizes the impact of the leak on the system and equipment. At the same time, by issuing alarms, it promptly notifies maintenance and operation personnel so that appropriate repairs and adjustments can be made.

[0091] In this embodiment, when the preset conditions are met based on steps S501-3-1 to S501-3-2, the compressor is stopped and the gas pipe shut-off valve is closed.

[0092] Step S501-3-1: Obtain the internal pressure of the trachea and the preset pressure threshold.

[0093] In this embodiment, the internal pressure of the trachea is obtained through a pressure sensor.

[0094] In one implementation, a pressure sensor is typically installed inside the trachea to monitor and record the pressure inside the trachea in real time.

[0095] Step S501-3-2: When the pressure inside the trachea is less than or equal to the preset pressure threshold, stop the compressor and close the trachea shut-off valve.

[0096] In one implementation, firstly, when the pressure inside the gas pipe drops below a preset pressure threshold, this typically indicates that the refrigerant in the gas pipe has been absorbed by the compressor. Subsequently, the control system sends a signal to close the gas pipe shut-off valve. After the shut-off valve closes, the refrigerant in the gas pipe can no longer flow, thus being trapped within the compressor. The compressor operation is then stopped. Once the compressor stops running, it will no longer absorb or compress the refrigerant in the gas pipe, thus preventing further refrigerant leakage into the indoor environment.

[0097] Through the above operations, the system can effectively prevent refrigerant leakage and ensure the safety of the air conditioning system.

[0098] It should be noted that although the steps in the above embodiments are described in a specific order, those skilled in the art will understand that in order to achieve the effects of the present invention, different steps do not necessarily have to be executed in such an order. They can be executed simultaneously (in parallel) or in other orders, and these variations are all within the scope of protection of the present invention.

[0099] Those skilled in the art will understand that all or part of the processes in the method of the above-described embodiment of the present invention can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes other computer programs, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable storage medium can include any entity or device capable of carrying the computer program, a medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory, a random access memory, an electrical carrier signal, a telecommunication signal, and a software distribution medium, etc. It should be noted that the content included in the computer-readable storage medium can be appropriately added to or subtracted according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable storage medium does not include electrical carrier signals and telecommunication signals.

[0100] Furthermore, the present invention also provides a control device. In one embodiment of the control device according to the present invention, the control device includes a processor and a storage device. The storage device can be configured to store a program for executing the control method for controlling the explosive refrigerant leakage of a multi-split air conditioning system according to the above-described method embodiments. The processor can be configured to execute the program in the storage device, which includes, but is not limited to, a program for executing the control method for controlling the explosive refrigerant leakage of a multi-split air conditioning system according to the above-described method embodiments. For ease of explanation, only the parts related to the embodiments of the present invention are shown; for specific technical details not disclosed, please refer to the method section of the embodiments of the present invention. This control device can be a control device device device comprising various electronic devices.

[0101] Furthermore, the present invention also provides a computer-readable storage medium. In one embodiment of the computer-readable storage medium according to the present invention, the computer-readable storage medium can be configured to store a program for executing the control method for explosive refrigerant leakage in a multi-split air conditioning system according to the above-described method embodiments. This program can be loaded and run by a processor to implement the control method for explosive refrigerant leakage in a multi-split air conditioning system. For ease of explanation, only the parts related to the embodiments of the present invention are shown; for specific technical details not disclosed, please refer to the method section of the embodiments of the present invention. The computer-readable storage medium can be a storage device comprising various electronic devices. Optionally, in the embodiments of the present invention, the computer-readable storage medium is a non-transitory computer-readable storage medium.

[0102] Furthermore, the present invention also provides an air conditioning system, including a control device, which operates to execute the control method for controlling refrigerant leakage in a multi-split air conditioning system as described in any of the above-described technical solutions.

[0103] Furthermore, it should be understood that since the various modules are only provided to illustrate the functional units of the device of the present invention, the physical devices corresponding to these modules may be the processor itself, or a part of the processor's software, hardware, or a combination of software and hardware. Therefore, the number of modules shown in the figures is merely illustrative.

[0104] Those skilled in the art will understand that the various modules in the device can be adaptively split or combined. Such splitting or combining of specific modules will not cause the technical solution to deviate from the principles of the present invention; therefore, the technical solutions after splitting or combining will fall within the protection scope of the present invention.

[0105] The technical solution of the present invention has been described above with reference to 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 can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A control method for a refrigerant leakage of a multi-split air conditioning system, characterized in that, The air conditioning system comprises an outdoor unit and multiple indoor units, and the method comprises: obtaining a first refrigerant concentration of the outdoor unit and second refrigerant concentrations corresponding to the multiple indoor units; obtaining a severity of refrigerant leakage of the outdoor unit based on the first refrigerant concentration; performing corresponding operations on the outdoor unit based on the severity of refrigerant leakage of the outdoor unit; obtaining information of refrigerant leakage of the indoor units based on the second refrigerant concentrations corresponding to the indoor units; performing corresponding operations on the indoor units based on the information of refrigerant leakage of the indoor units; the information of refrigerant leakage of the indoor units comprises a severity of refrigerant leakage of the indoor units and a number of indoor units that have occurred refrigerant leakage, wherein the severity of refrigerant leakage of the indoor units comprises a third severity, and the "obtaining the information of refrigerant leakage of the indoor units based on the second refrigerant concentrations corresponding to the indoor units" comprises: obtaining a preset second concentration threshold; comparing the preset second concentration threshold with the second refrigerant concentrations corresponding to the indoor units to obtain the severity of refrigerant leakage of the corresponding indoor units and the number of indoor units that have occurred refrigerant leakage; and the "performing corresponding operations on the indoor units based on the information of refrigerant leakage of the indoor units" comprises: performing corresponding operations on the indoor units based on the severity of refrigerant leakage of the indoor units and the number of indoor units that have occurred refrigerant leakage; the "obtaining the severity of refrigerant leakage of the corresponding indoor units" comprises: if the second refrigerant concentration of the indoor units is greater than or equal to the preset second concentration threshold, obtaining the third severity of the corresponding indoor units; and the "performing corresponding operations on the indoor units based on the severity of refrigerant leakage of the indoor units and the number of indoor units that have occurred refrigerant leakage" comprises: obtaining a preset first number threshold; if the number of indoor units with the third severity of refrigerant leakage is greater than the preset first number threshold, issuing a third alarm, controlling the indoor units with the third severity of refrigerant leakage to rotate the fan to reduce the refrigerant concentration in the indoor units, and controlling the outdoor unit to close the liquid pipe stop valve, operate the compressor and reach a preset condition, stop operating the compressor and close the gas pipe stop valve; the "operating the compressor until reaching the preset condition, then stopping operating the compressor and closing the gas pipe stop valve" comprises: obtaining an internal pressure of the gas pipe and a preset pressure threshold; when the internal pressure of the gas pipe is less than or equal to the preset pressure threshold, stop operating the compressor and close the gas pipe stop valve.

2. The control method of claim 1, wherein the control method comprises: the severity of refrigerant leakage of the outdoor unit comprises a first severity, and the "obtaining the severity of refrigerant leakage of the outdoor unit based on the first refrigerant concentration" comprises: obtaining a preset first concentration threshold; comparing the first refrigerant concentration and the preset first concentration threshold; if the first refrigerant concentration is greater than or equal to the preset first concentration threshold, determining that the outdoor unit is of the first severity; if the severity of refrigerant leakage of the outdoor unit is the first severity, issuing a first alarm, controlling the outdoor unit to rotate the fan to discharge the refrigerant in the outdoor unit, and controlling the outdoor unit to close the liquid pipe stop valve and the gas pipe stop valve. 3.The control method of claim 2, wherein, the severity of refrigerant leakage of the outdoor unit further comprises a second severity. If the first refrigerant concentration is less than a preset first concentration threshold, a second severity is obtained. 4.The control method of claim 1, wherein, The method further comprises: If the number of indoor units of the third severity is less than or equal to a preset first number threshold, a second alarm is sent and the indoor unit fan of the indoor unit of the third severity is controlled to run to reduce the refrigerant concentration in the indoor unit.

5. A control device comprising a processor and a storage device, said storage device being adapted to store a plurality of computer programs, characterized in that, The computer program is adapted to be loaded and run by the processor to execute the control method for the explosive refrigerant leakage of the multi-split air conditioning system according to any one of claims 1 to 4.

6. A computer readable storage medium having stored therein a plurality of computer programs, characterized in that, The computer program is adapted to be loaded and run by the processor to execute the control method for the explosive refrigerant leakage of the multi-split air conditioning system according to any one of claims 1 to 4.

7. An air conditioning system comprising a control device, characterized in that The control device is adapted to execute the control method for the explosive refrigerant leakage of the multi-split air conditioning system according to any one of claims 1 to 4.

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