Method and device for controlling easy-to-explode refrigerant leakage of multi-split air conditioning system

Abstract

The invention relates to a control method and a control device for explosive refrigerant leakage of a multi-split air conditioning system, the air conditioning system comprises an outdoor unit and a plurality of indoor units, and the method comprises the following steps: acquiring a first refrigerant concentration of the outdoor unit and a second refrigerant concentration corresponding to the plurality of indoor units; based on the first refrigerant concentration, the severity degree of refrigerant leakage of the outdoor unit is obtained; performing corresponding operation on the outdoor unit based on the severity of refrigerant leakage of the outdoor unit; based on the second refrigerant concentration corresponding to the indoor unit, refrigerant leakage information of the indoor unit is obtained; and corresponding operation is conducted on the corresponding indoor unit based on the refrigerant leakage information of the indoor unit. By acquiring the refrigerant concentrations of the outdoor unit and the plurality of indoor units in real time, the severity of refrigerant leakage can be quickly found and accurately evaluated, so that potential safety hazards are reduced. According to the scheme, a refrigerant leakage event can be quickly responded, explosion caused by too high refrigerant concentration is effectively prevented, and the use safety of the air conditioning system is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and specifically provides a control method and a control device for explosive refrigerant leakage in a multi-split air conditioning system. Background Art

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

[0003] However, once these refrigerants leak, due to their own chemical properties, they will quickly accumulate in a certain area to form high-concentration refrigerant gases. When these high-concentration refrigerant gases meet certain environmental conditions, they may form explosive clouds and cause explosions, thus posing a safety hazard to the air conditioning system.

[0004] Accordingly, the art needs a new control solution for explosive refrigerant leakage 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 partially solve the problem in the prior art that leakage of explosive refrigerant easily causes potential safety hazards.

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

[0007] As an alternative or supplement to the above scheme, in a method according to an embodiment of the present invention, the severity of refrigerant leakage of the outdoor unit includes: a first severity, "based on the first refrigerant concentration, obtaining the severity of refrigerant leakage of the outdoor unit", including: 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, the outdoor unit is judged to be of the first severity; if the severity of refrigerant leakage of the outdoor unit is the first severity, 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 stop valve and gas pipe stop valve are controlled to be closed.

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

[0009] As an alternative or supplement to the above scheme, 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 where refrigerant leakage has occurred, wherein the severity of the refrigerant leakage of the indoor unit includes a third severity, and "obtaining 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 refrigerant leakage of the corresponding indoor unit and the number of indoor units where refrigerant leakage has occurred; "performing corresponding operations on the corresponding indoor unit based on the information on refrigerant leakage of the indoor unit" includes: performing corresponding operations on the corresponding indoor unit based on the severity of the refrigerant leakage of the indoor unit and the number of indoor units where refrigerant leakage has occurred.

[0010] As an alternative or supplement to the above scheme, 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 where refrigerant leakage has occurred, performing corresponding operations on the corresponding indoor unit" includes: obtaining a preset first number threshold; if the number of indoor units with the severity of refrigerant leakage 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 indoor unit fan with the severity of refrigerant leakage of the first severity to reduce the refrigerant concentration in the indoor unit.

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

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

[0013] In a second aspect, a control device is provided, which includes a processor and a storage device, wherein the storage device is suitable for storing multiple computer programs, and the computer programs are suitable for being loaded and run by the processor to execute the method for controlling explosive refrigerant leakage in a multi-split air-conditioning system described in any of the technical solutions of the method for controlling explosive refrigerant leakage in the multi-split air-conditioning system.

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

[0015] In a fourth aspect, an air-conditioning system is provided, comprising a control device, wherein the control device operates to execute the method for controlling explosive refrigerant leakage in a multi-split air-conditioning system as described in any one of the technical solutions of the method for controlling explosive refrigerant leakage in the multi-split air-conditioning system.

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

[0017] In the technical solution of the present invention, by obtaining the refrigerant concentration of the outdoor unit and multiple indoor units in real time, the severity of the refrigerant leakage can be quickly discovered and accurately assessed, thereby reducing safety hazards. By judging the severity of the refrigerant leakage, the refrigerant leakage of the indoor and outdoor units can be accurately controlled, effectively reducing the safety risks after the refrigerant leakage. This solution can quickly respond to refrigerant leakage incidents and effectively prevent explosions caused by excessive refrigerant concentration, greatly improving the safety of the air-conditioning system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The disclosure of the present invention will become more easily understood with reference to the accompanying drawings. It is easy for those skilled in the art to understand that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In addition, similar numbers in the figures are used to represent similar components, among which:

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

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

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

[0022] Some embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0023] In the description of the present invention, "module" and "processor" may include hardware, software or a combination of the two. A module may include hardware circuits, various suitable sensors, communication ports, and memories, and may also include software parts, such as computer programs, or a combination of software and hardware. The processor may be a central processing unit, a microprocessor, an image processor, a digital signal processor, or any other suitable processor. The processor has data and / or signal processing functions. The processor may be implemented in software, hardware, or a combination of the two. Non-temporary computer-readable storage media include any suitable medium that can store 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 term "at least one A or B" or "at least one of A and B" has a similar meaning to "A and / or B", and may include only A, only B, or A and B. The singular terms "one" and "the" may also include plural forms.

[0024] Here we first explain some terms involved in the present invention.

[0025] Explosive refrigerants: Explosive refrigerants refer to a type of coolant that can explode under conditions such as high temperature, high pressure or fire. Such as propane (R290), isobutane (R600a) and R32. Although these refrigerants have good cooling performance and are less destructive to the environment, they are flammable and explosive, so special attention should be paid to safety when using and storing them.

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

[0027] Step S10: obtaining a first refrigerant concentration of the outdoor unit and second refrigerant concentrations corresponding to a plurality of indoor units.

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

[0029] In one embodiment, by obtaining 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 is the basis for the subsequent control strategy formulation.

[0030] The first refrigerant concentration here refers to the refrigerant concentration after the refrigerant and ambient air are mixed inside the outdoor unit, which is used to reflect the refrigerant leakage of the outdoor unit. The second refrigerant concentration refers to the refrigerant concentration after the refrigerant and ambient air are mixed inside each indoor unit, which is used to reflect the refrigerant leakage of each indoor unit. By comparing these two concentrations, the location of the refrigerant leakage can be determined, so that subsequent operations can be carried out in a targeted manner.

[0031] The purpose of this step is to obtain refrigerant leakage information, which is the basis for the subsequent steps of refrigerant leakage control. Only by knowing the location and severity of the refrigerant leakage can the refrigerant leakage be effectively controlled.

[0032] Step S20: based on the first refrigerant concentration, obtaining the severity of the refrigerant leakage of the outdoor unit.

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

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

[0035] The first severity level refers to the severity of the refrigerant leakage exceeding the preset first concentration threshold. In this case, immediate measures need to be taken to control the refrigerant leakage to avoid more serious consequences. The second severity level is when the first refrigerant concentration is lower than the preset first concentration threshold. This means that although there may be some leakage of refrigerant in the system, its degree has not reached the preset critical value, and there is no need to perform emergency control operations on the system.

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

[0037] Step S201: obtaining a preset first concentration threshold.

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

[0039] In one embodiment, the first concentration threshold represents the severity limit of the refrigerant leakage. If the concentration of the refrigerant reaches or exceeds this threshold, it can be considered that the refrigerant leakage has reached the first severity level, and relevant control measures need to be taken immediately.

[0040] Step S202: comparing the first refrigerant concentration and a 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 leakage.

[0042] In one embodiment, in order 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 the units need to be converted first. At the same time, in order to reduce errors, this comparison process may need to be repeated multiple times to obtain a more stable and accurate result.

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

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

[0045] In one embodiment, once it is determined that the first refrigerant concentration of the outdoor unit is greater than or equal to a preset first concentration threshold, the system will determine that the severity of the refrigerant leakage is the first severity. At this time, this interim result is based on the comparison of the preset threshold, which is regarded as a signal here, indicating that the refrigerant leakage has reached an emergency state. If the leakage continues and the concentration increases, there will be a risk of explosion.

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

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

[0048] Step S30: performing corresponding operations on the outdoor unit based on the severity of the refrigerant leakage of the outdoor unit.

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

[0050] In one implementation, the specific operations performed in step S301 are as follows:

[0051] Step S301: If the severity of the refrigerant leakage of the outdoor unit is the first severity, a first alarm is issued, the outdoor unit fan is controlled to rotate to discharge the refrigerant in the outdoor unit, and the liquid pipe stop valve and the gas pipe stop valve of the outdoor unit are controlled to be closed.

[0052] In this embodiment, the severity of the refrigerant leakage is determined to be the first severity, at which point a safety risk is involved, and the system immediately takes measures to control and manage the situation.

[0053] In one embodiment, first, the system will issue a first alarm. This alarm may be issued through the system's control panel, user interface, or remote notification (such as a mobile phone application, etc.), and its purpose is to let the operator, user, or maintenance personnel know as soon as possible that there is a serious refrigerant leakage problem in the air conditioning system. The first alarm can be in various forms, such as an audible alarm, a visual alarm (such as a flashing light or a warning message on a display), etc., to ensure that it can attract people's attention.

[0054] Next, the control system will drive the fan of the outdoor unit to rotate to discharge the refrigerant in the outdoor unit. This is because the refrigerant inside the outdoor unit is in a high-pressure state. If it leaks out, it may cause harm to personnel or cause an explosion. By controlling the rotation of the fan, the refrigerant can be quickly discharged from the outdoor unit, thereby reducing this risk.

[0055] At the same time, the system will also control the liquid pipe stop valve and gas pipe stop valve of the outdoor unit to close. The liquid pipe and gas pipe are important channels connecting the indoor unit and the outdoor unit, and the refrigerant flows in these two pipes. When a refrigerant leak occurs, closing these two stop valves can cut off the flow of the refrigerant, block a part of the refrigerant in the compressor, and prevent the refrigerant from continuing to leak out of the system.

[0056] Through such operations, the severity of refrigerant leakage can be effectively controlled, reducing the potential impact of leaked refrigerant on the environment and personnel, while also providing conditions for subsequent maintenance work.

[0057] Step S40: obtaining information on refrigerant leakage of the indoor unit based on the second refrigerant concentration corresponding to the indoor unit.

[0058] In this embodiment, 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 where refrigerant leakage has occurred, wherein the severity of the refrigerant leakage of the indoor unit includes a third severity.

[0059] In one embodiment, the system obtains information about refrigerant leakage by analyzing and processing the second refrigerant concentration corresponding to each indoor unit. In an air conditioning system with multiple indoor units, each indoor unit may become a source of refrigerant leakage, so this step is crucial for detecting and locating refrigerant leakage.

[0060] First, the system will obtain the second refrigerant concentration corresponding to each indoor unit. This information is usually provided by the refrigerant sensor or detection equipment in the indoor unit, which can monitor and record the refrigerant concentration in real time and transmit the data to the control system. In this process, since there are multiple indoor units, data collection needs to be performed one by one to ensure that the refrigerant concentration data of each indoor unit can be accurately obtained and recorded.

[0061] Next, based on the collected second refrigerant concentration, the system can determine whether there is a refrigerant leak in the indoor unit and the severity of the leak. The specific judgment method can be compared with the preset refrigerant concentration threshold. If the refrigerant concentration of the indoor unit exceeds this threshold, it can be determined that there is a refrigerant leak in the indoor unit. At the same time, the possible source of the leak can also be determined by comparing the refrigerant concentrations of different indoor units.

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

[0063] Step S401: obtaining a preset second concentration threshold.

[0064] In this embodiment, the preset second concentration threshold is set based on factors such as the characteristics of the refrigerant, the design and operating parameters of the indoor unit, and represents a safe range of refrigerant concentration. When the refrigerant concentration of 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 the refrigerant leakage of the corresponding indoor unit and the number of indoor units where the refrigerant leakage has occurred.

[0066] In one embodiment, an independent refrigerant concentration detection is performed on each indoor unit. The second 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 the refrigerant leakage of each indoor unit. At the same time, this process can also obtain the number of indoor units that have experienced refrigerant leakage. In this way, the specific situation of the refrigerant leakage can be understood in detail, including the severity of the leakage and the scope of the impact.

[0067] It should be noted that the preset second concentration threshold is a key reference standard. If the second refrigerant concentration of the indoor unit exceeds this threshold, it can be determined that there is a risk of refrigerant leakage in the indoor unit. At the same time, the degree to which the refrigerant concentration exceeds the threshold can also be used to assess the severity of the refrigerant leakage. For example, the higher the degree to which the refrigerant concentration exceeds the threshold, the greater the severity of the leakage.

[0068] In this embodiment, the judgment is made through steps S402-1 to S402-2. 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, the third severity level of the corresponding indoor unit is obtained.

[0070] In one implementation, if the second refrigerant concentration of a certain indoor unit exceeds or is equal to a preset second concentration threshold, the refrigerant leakage of the indoor unit will be determined to be at the third severity level.

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

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

[0073] In one embodiment, if the second refrigerant concentration of the indoor unit is lower than a preset second concentration threshold, the refrigerant leakage of the indoor unit is determined to be at the fourth severity level. The fourth severity level indicates that the refrigerant leakage is relatively minor, which may be just normal wear and tear of the equipment or a small-scale leakage, and has little impact on personnel and equipment.

[0074] Through the above two steps, the refrigerant leakage situation can be quickly obtained, providing a basis for subsequent processing.

[0075] Step S50: performing corresponding operations on the corresponding indoor units based on the information of the refrigerant leakage of the indoor units.

[0076] In this embodiment, according to the previously acquired refrigerant leakage information of the indoor unit, corresponding operations will be performed on the indoor unit with serious leakage. The purpose of these operations is to prevent the deterioration of the refrigerant leakage and ensure the safety of equipment and personnel.

[0077] In one implementation, corresponding operations on the indoor unit are implemented through step S501.

[0078] Step S501: Based on the severity of the refrigerant leakage of the indoor unit and the number of indoor units where the refrigerant leakage has occurred, corresponding operations are performed on the corresponding indoor units.

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

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

[0081] Step S501-2: If the number of indoor units with the third severity of refrigerant leakage is less than or equal to the preset first number threshold, a second alarm is issued and the fans of the indoor units with the first severity of refrigerant leakage are controlled to operate to reduce the refrigerant concentration in the indoor units.

[0082] In one embodiment, if the number of indoor units with a third severity of refrigerant leakage is less than or equal to a preset first number threshold, the system will issue a second alarm. The second alarm is intended to notify relevant personnel or equipment of the refrigerant leakage. The alarm may be in the form of sound, light, electronic message, or other means that can effectively convey information.

[0083] Next, the control system will operate the indoor units with the third-most severe refrigerant leakage. Here, the control system will instruct the fans of these indoor units to operate to help reduce the refrigerant concentration in the indoor units. The operation of the fans can promote air flow and help dilute the refrigerant inside the indoor units, thereby reducing the refrigerant concentration. By operating the fans, the refrigerant concentration can be immediately reduced, thereby reducing the risk of refrigerant explosion.

[0084] Here is an example, assuming that in a central air conditioning system, there are a total of 10 indoor units in operation. The system detects that the refrigerant concentration of two of the indoor units has reached the third severity level, and the preset first number threshold is set to 3. In this case, the number of indoor units with refrigerant leakage (i.e., 2 units) is less than or equal to the preset first number threshold (i.e., 3 units), and the system will perform the above operation, i.e., issue a second alarm and control the operation of the indoor unit fan whose refrigerant leakage severity is the first severity level.

[0085] In this example, although the refrigerant concentration of only two indoor units has reached the third severity level, since the number of these two indoor units is less than the preset first number threshold, the system will choose to let the other indoor units continue to operate to prevent the overall operating efficiency of the system from being greatly affected. At the same time, the fans of the two indoor units with refrigerant leakage will be controlled to reduce the refrigerant concentration inside them and avoid safety problems caused by excessive refrigerant concentration.

[0086] Step S501-3: If the number of indoor units with the third severity of refrigerant leakage is greater than the preset first number threshold, a third alarm is issued, the fans of the indoor units with the first severity of refrigerant leakage are controlled to operate to reduce the refrigerant concentration in the indoor units, and the outdoor unit is controlled to close the liquid pipe stop valve, and when the compressor is operated and the preset conditions are met, the compressor is stopped and the gas pipe stop valve is closed.

[0087] In one embodiment, if the number of indoor units with the third severity of refrigerant leakage is greater than the preset first number threshold, the system will issue a third alarm, which indicates that the refrigerant leakage is already serious and may pose a serious threat to the operating efficiency of the system and the safety of the equipment. Preferably, in this embodiment, the third alarm is a higher level alarm, which sends a strong warning to the maintenance personnel or the operator through sound, light, or electronic message.

[0088] Then, the control system will operate the indoor units with the third severity of refrigerant leakage. This operation includes controlling the operation of the fans of these indoor units to reduce the concentration of the refrigerant. Preferably, in this embodiment, the fan operates at the highest frequency to generate a larger air volume to ensure that the refrigerant in the indoor unit can be quickly and effectively discharged to prevent the refrigerant concentration from further increasing.

[0089] At the same time, the control system will operate the outdoor unit. This operation includes closing the liquid pipe shutoff valve and running the compressor. At this time, due to the severity of the refrigerant leakage, the control system needs to ensure that the outdoor unit no longer provides new refrigerant to the indoor unit to avoid further aggravating the severity of the refrigerant leakage. Therefore, the control system will close the liquid pipe shutoff valve and disconnect the refrigerant supply between the indoor unit and the outdoor unit. At the same time, the control system will also run the compressor to recycle the remaining refrigerant in the system to the outdoor unit as much as possible. Once the preset conditions are met, the control system will stop the compressor and close the gas pipe shutoff valve.

[0090] This series of operating steps is designed to ensure the operating efficiency of the system and the safety of the equipment. In the event of a serious refrigerant leak, the impact of the refrigerant leak on the system and equipment can be minimized. At the same time, by issuing an alarm, maintenance personnel and operators are notified in a timely manner so that they can carry out corresponding repairs and adjustments.

[0091] In this embodiment, based on steps S501-3-1 to S501-3-2, when a preset condition is reached, the compressor is stopped and the gas pipe stop valve is closed.

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

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

[0094] In one embodiment, the pressure sensor is generally installed inside the trachea and can monitor and record the pressure value inside the trachea in real time.

[0095] Step S501-3-2: When the internal pressure of the air pipe is less than or equal to the preset pressure threshold, stop the compressor and close the air pipe stop valve.

[0096] In one embodiment, first, when the pressure inside the air pipe drops below a preset pressure threshold, this generally indicates that the refrigerant in the air pipe has been absorbed by the compressor. Subsequently, the control system will send a signal to close the air pipe shut-off valve. After the shut-off valve is closed, the refrigerant in the air pipe will not be able to flow, and thus will be blocked in the compressor. Thereafter, the operation of the compressor is stopped. After the compressor stops running, it will no longer absorb or compress the refrigerant in the air pipe, thereby preventing the refrigerant from further leaking 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 pointed out that although the various steps in the above embodiments are described in a specific order, those skilled in the art can understand that in order to achieve the effects of the present invention, different steps do not have to be performed in such an order. They can be performed simultaneously (in parallel) or in other orders. These changes are within the scope of protection of the present invention.

[0099] It is understood by those skilled in the art that the present invention implements all or part of the processes in the method of the above embodiment, and can also be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of each of the above method embodiments when executed by the processor. Among them, the computer program includes a computer program, and the computer program can be in source code form, object code form, executable file or some intermediate form. The computer-readable storage medium may include: any entity or device, medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory, random access memory, electric carrier signal, telecommunication signal and software distribution medium that can carry the computer program. It should be noted that the content contained in the computer-readable storage medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable storage media do not include electric carrier signals and telecommunication signals.

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

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

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

[0103] Further, it should be understood that since the setting of each module is only for illustrating 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 software in the processor, a part of the hardware, or a part of the combination of software and hardware. Therefore, the number of each module in the figure is only schematic.

[0104] Those skilled in the art will appreciate that the modules in the device can be adaptively split or merged. Such splitting or merging of specific modules will not cause the technical solution to deviate from the principle of the present invention, and therefore, the technical solutions after splitting or merging will fall within the protection scope of the present invention.

[0105] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle 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 these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A method for controlling the leakage of explosive refrigerant in a multi-split air conditioning system, characterized in that: The air conditioning system includes an outdoor unit and a plurality of indoor units, and the method includes: Obtaining a first refrigerant concentration of an outdoor unit and second refrigerant concentrations corresponding to a plurality of indoor units; Based on the first refrigerant concentration, obtaining the severity of the refrigerant leakage of the outdoor unit; Perform corresponding operations on the outdoor unit based on the severity of the refrigerant leakage in the outdoor unit; Based on the second refrigerant concentration corresponding to the indoor unit, obtaining refrigerant leakage information of the indoor unit; Based on the information of refrigerant leakage in the indoor unit, corresponding operations are performed on the corresponding indoor unit.

2. The method for controlling explosive refrigerant leakage in a multi-split air conditioning system according to claim 1, characterized in that: The severity of the refrigerant leakage of the outdoor unit includes: a first severity, "based on the first refrigerant concentration, the severity of the refrigerant leakage of the outdoor unit is obtained", including: Obtaining a preset first concentration threshold; Comparing the first refrigerant concentration with a preset first concentration threshold; If the first refrigerant concentration is greater than or equal to a preset first concentration threshold, the outdoor unit is judged to be at a first severity level; If the severity of the refrigerant leakage of the outdoor unit is the first severity, a first alarm is issued, the outdoor unit fan is controlled to rotate to discharge the refrigerant in the outdoor unit, and the liquid pipe stop valve and the gas pipe stop valve of the outdoor unit are controlled to be closed.

3. The method for controlling explosive refrigerant leakage in a multi-split air conditioning system according to claim 2, characterized in that: The severity of outdoor unit refrigerant leakage also includes: the second severity; If the first refrigerant concentration is less than a preset first concentration threshold, a second severity level is obtained.

4. The method for controlling explosive refrigerant leakage in a multi-split air conditioning system according to any one of claims 1 to 3, characterized in that: The information on the refrigerant leakage of the indoor unit includes: the severity of the refrigerant leakage of the indoor unit and the number of indoor units where the refrigerant leakage has occurred, wherein the severity of the refrigerant leakage of the indoor unit includes a third severity, and "obtaining the information on the 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 where the refrigerant leakage has occurred; "Performing corresponding operations on the corresponding indoor units based on the information of indoor unit refrigerant leakage", including: Based on the severity of the refrigerant leakage of the indoor unit and the number of indoor units where the refrigerant leakage has occurred, corresponding operations are performed on the corresponding indoor units.

5. The method for controlling explosive refrigerant leakage in a multi-split air conditioning system according to claim 4, characterized in that: "Get the severity of refrigerant leakage of the corresponding indoor unit", including: If the second refrigerant concentration of the indoor unit is greater than or equal to the preset second concentration threshold, the third severity level of the corresponding indoor unit is obtained; "Based on the severity of the refrigerant leakage of the indoor unit and the number of indoor units that have experienced refrigerant leakage, corresponding operations are performed on the corresponding indoor units", including: Obtaining a preset first number threshold; If the number of indoor units with the third severity of refrigerant leakage is less than or equal to the preset first number threshold, a second alarm is issued and the fans of the indoor units with the first severity of refrigerant leakage are controlled to operate to reduce the refrigerant concentration in the indoor units.

6. The method for controlling explosive refrigerant leakage in a multi-split air conditioning system according to claim 5, further comprising: If the number of indoor units with the third severity level of refrigerant leakage is greater than the preset first number threshold, a third alarm is issued, the fans of the indoor units with the first severity level of refrigerant leakage are controlled to operate to reduce the refrigerant concentration in the indoor units, and the outdoor unit is controlled to close the liquid pipe stop valve, and when the compressor is operated and the preset conditions are met, the compressor is stopped and the gas pipe stop valve is closed.

7. The method for controlling explosive refrigerant leakage in a multi-split air conditioning system according to claim 6, "when the compressor is operated until a preset condition is reached, the compressor is stopped and the gas pipe stop valve is closed", comprising: Obtaining the internal pressure of the trachea and the preset pressure threshold; When the internal pressure of the air pipe is less than or equal to a preset pressure threshold, the compressor is stopped and the air pipe stop valve is closed.

8. A control device, comprising a processor and a storage device, wherein the storage device is suitable for storing a plurality of computer programs, characterized in that: The computer program is suitable for being loaded and run by the processor to execute the control method for explosive refrigerant leakage of a multi-split air-conditioning system according to any one of claims 1 to 7.

9. A computer-readable storage medium storing a plurality of computer programs, characterized in that: The computer program is suitable for being loaded and run by a processor to execute the method for controlling explosive refrigerant leakage in a multi-split air-conditioning system according to any one of claims 1 to 7.

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

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