Multi-split air conditioner and refrigerant leakage detection and recovery control method

Abstract

The invention provides a multi-split air conditioner and a refrigerant leakage detection and recovery control method, which are applied to the field of air conditioner control, and the method comprises the following steps: under the condition that a refrigerant detector arranged on a target object detects refrigerant leakage, determining a safety control strategy corresponding to the target object according to the type of the target object; executing a safety control strategy corresponding to the target object; wherein the type of the target object comprises any one of the following items: a valve box, a first indoor unit and a second indoor unit. According to the multi-split air conditioner and the refrigerant leakage detection and recovery control method provided by the invention, refrigerant recovery control is performed in a mode of series-parallel connection of the box with the block valve and the box without the block valve, so that the cost is low, the refrigerant recovery speed is high, and the safety is higher.

Description

Technical Field

[0001] This application relates to the field of air conditioner control, and particularly to a multi-connected air conditioner and a refrigerant leakage detection and recovery control method. Background Art

[0002] With the continuous improvement of people's living standards and the continuous improvement of the intelligent level of household electrical appliances, intelligent household appliances are becoming more and more popular. Users can use the air conditioner for heating in winter to increase the indoor temperature; they can also use the air conditioner for cooling in summer to lower the indoor temperature.

[0003] Air conditioning systems generally use refrigerants as the medium for heat exchange. Environmentally friendly refrigerants such as R32 and R290 have the advantages of zero Ozone Depletion Potential (ODP) and relatively low Global Warming Potential (GWP). However, they are also flammable, bringing certain safety risks in use. During use or storage, if refrigerant leakage occurs, the local refrigerant concentration may exceed the standard. Once a fire source is encountered, a fire may be caused, and there may even be a risk of explosion in a closed room. Based on this, after detecting refrigerant leakage, it is necessary to recover the refrigerant to avoid the safety risks brought by refrigerant leakage.

[0004] However, the refrigerant leakage detection and recovery solutions in the related art not only have high costs, but also have technical problems such as slow refrigerant recovery speed and incomplete recovery for multi-connected air conditioners. Summary of the Invention

[0005] The purpose of this application is to provide a multi-connected air conditioner and a refrigerant leakage detection and recovery control method. By using a mixed connection method of a cut-off valve box and a non-cut-off valve box for refrigerant recovery control, it not only has low costs, fast refrigerant recovery speed, but also has higher safety.

[0006] In a first aspect, this application provides a multi-connected air conditioner, including: An outdoor unit, a plurality of indoor units, and a control unit; the plurality of indoor units include: a first indoor unit and a second indoor unit; a valve box is provided between the first indoor unit and the outdoor unit; no valve box is provided between the second indoor unit and the outdoor unit; refrigerant detectors are provided on the valve box, the first indoor unit, and the second indoor unit; the control unit is configured to determine a safety control strategy corresponding to the target object according to the type of the target object when the refrigerant detector provided on the target object detects refrigerant leakage; the control unit is further configured to execute the safety control strategy corresponding to the target object; wherein, the type of the target object includes any one of the following: valve box, first indoor unit, and second indoor unit.

[0007] Optionally, the control unit is specifically configured to execute a first control strategy corresponding to the target object when the target object is the first indoor unit; wherein, the first control strategy includes: controlling the valve box connected to the target object to close, and controlling the fan of the target object to operate at the maximum speed for a first preset duration; the first preset duration is positively correlated with the evaporator capacity of the target object.

[0008] Optionally, an outdoor liquid-side cut-off valve is provided on the refrigerant pipeline between the outdoor unit and the indoor unit of the outdoor unit; the control unit is specifically configured to execute a second control strategy corresponding to the target object when the target object is the second indoor unit; wherein, the second control strategy includes: closing the valve boxes of each first indoor unit on the multi-connected air conditioner, adjusting the operation model of the target object to the cooling mode, controlling the fan of the target object to operate at the maximum speed for a second preset duration, and controlling the operation of the target object according to preset control parameters; the second preset duration is positively correlated with the evaporator capacity of the target object; the preset control parameters include: real-time suction pressure, preset suction pressure threshold, closing duration of the outdoor liquid-side cut-off valve, and preset refrigerant recovery duration.

[0009] Optionally, an outdoor gas-side cut-off valve is provided on the refrigerant pipeline between the outdoor unit and the indoor unit of the outdoor unit; the control unit is specifically configured to control the outdoor gas-side cut-off valve to close when the real-time suction pressure of the target object is less than or equal to the preset suction pressure threshold and the closing duration of the outdoor gas-side cut-off valve is equal to the preset refrigerant recovery duration.

[0010] Optionally, a ventilation fan, a liquid-side cut-off valve, and a gas-side cut-off valve are provided on the valve box; a pressure relief valve is provided between the liquid-side cut-off valve and the gas-side cut-off valve; the control unit is specifically configured to execute a third control strategy corresponding to the target object when the target object is the valve box; wherein, the third control strategy includes: closing the indoor unit, the liquid-side cut-off valve, and the gas-side cut-off valve connected to the target object, and after opening the ventilation fan for a third preset duration, closing the ventilation fan. If, after closing the ventilation fan, the refrigerant detector in the valve box indicates that the growth rate of the refrigerant content in the valve box is greater than the preset growth rate threshold, then close the multi-connected air conditioner.

[0011] In a second aspect, the present application provides a refrigerant leakage detection and recovery control method, including: When a refrigerant detector set on a target object detects refrigerant leakage, a safety control strategy corresponding to the target object is determined according to the type of the target object; the safety control strategy corresponding to the target object is executed; wherein, the type of the target object includes any one of the following: a valve box, a first indoor unit, and a second indoor unit.

[0012] Optionally, the executing the safety control strategy corresponding to the target object includes: when the target object is a first indoor unit, executing a first control strategy corresponding to the target object; wherein, the first control strategy includes: controlling the valve box connected to the target object to close, and controlling the fan of the target object to operate at the maximum speed for a first preset duration; the first preset duration is positively correlated with the evaporator capacity of the target object.

[0013] Optionally, an outdoor unit side liquid cutoff valve is provided on the outdoor unit; the executing the safety control strategy corresponding to the target object includes: when the target object is a second indoor unit, executing a second control strategy corresponding to the target object; wherein, the second control strategy includes: closing the valve boxes of each first indoor unit on the multi-connected air conditioner, adjusting the operation model of the target object to the cooling mode, controlling the fan of the target object to operate at the maximum speed for a second preset duration, and controlling the operation of the target object according to preset control parameters; the second preset duration is positively correlated with the evaporator capacity of the target object; the preset control parameters include: the real-time suction pressure, a preset suction pressure threshold, the closing duration of the outdoor unit side liquid cutoff valve, and a preset refrigerant recovery duration.

[0014] Optionally, an outdoor unit side gas cutoff valve is provided on the outdoor unit; the controlling the operation of the target object according to preset control parameters includes: when the real-time suction pressure of the target object is less than or equal to the preset suction pressure threshold and the closing duration of the outdoor unit side gas cutoff valve is equal to the preset refrigerant recovery duration, controlling the outdoor unit side gas cutoff valve to close.

[0015] Optionally, a ventilation fan, a liquid side cutoff valve, and a gas side cutoff valve are provided on the valve box; a pressure relief valve is provided between the liquid side cutoff valve and the gas side cutoff valve; the executing the safety control strategy corresponding to the target object includes: when the target object is a valve box, executing a third control strategy corresponding to the target object; wherein, the third control strategy includes: closing the indoor unit, the liquid side cutoff valve, and the gas side cutoff valve connected to the target object, and after opening the ventilation fan for a third preset duration, closing the ventilation fan, and if the refrigerant detector in the valve box indicates that the growth rate of the refrigerant content in the valve box is greater than a preset growth rate threshold after closing the ventilation fan, closing the multi-connected air conditioner.

[0016] The present application also provides a computer program product, including a computer program / instructions, which, when executed by a processor, implements the steps of the refrigerant leakage detection and recovery control method described in any one of the above.

[0017] The present application also provides an electronic device, which may be the multi-connected air conditioner in the first aspect above. The air conditioner includes a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, it implements the steps of the refrigerant leakage detection and recovery control method described in any one of the above.

[0018] The present application also provides a computer-readable storage medium, on which a computer program is stored, which, when executed by a processor, implements the steps of the refrigerant leakage detection and recovery control method described in any one of the above.

[0019] For the multi-connected air conditioner and the refrigerant leakage detection and recovery control method provided by the present application, in the case where a refrigerant detector provided on a target object detects refrigerant leakage, a safety control strategy corresponding to the target object is determined according to the type of the target object; the safety control strategy corresponding to the target object is executed; wherein, the type of the target object includes any one of the following: a valve box, a first indoor unit, and a second indoor unit. In this way, by using a mixed connection method of a valve box with a cut-off valve and a valve box without a cut-off valve for refrigerant recovery control, not only the cost is low, the refrigerant recovery speed is fast, but also the safety is higher. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the present application or the prior art, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 is a schematic structural diagram of the multi-connected air conditioner provided by the present application; Figure 2 is a schematic structural diagram of the outdoor unit provided by the present application; Figure 3 is a schematic structural diagram of the valve box provided by the present application; Figure 4 is a schematic flowchart of the refrigerant leakage detection and recovery control method provided by the present application; Figure 5 is a schematic structural diagram of the electronic device provided by the present application. Detailed Embodiments

[0022] To make the objectives, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be clearly and completely described below with reference to the accompanying drawings in the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without making creative efforts shall fall within the scope of protection of the present application.

[0023] The terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such used data may be interchanged under appropriate circumstances so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of the same category, and do not limit the number of objects. For example, the first object may be one or multiple. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / ", generally represents an "or" relationship between the associated objects before and after.

[0024] The following will describe in detail the operating principle of the air conditioner involved in the embodiments of the present application: The compressor compresses the refrigerant (refrigerant medium), and transports it to the condenser through a pipeline. The high-temperature and high-pressure gaseous refrigerant releases heat in the condenser and becomes a medium-temperature and high-pressure liquid refrigerant. Then, the medium-temperature and high-pressure liquid refrigerant becomes a low-temperature and low-pressure liquid refrigerant after depressurization through a capillary tube (throttling unit). The low-temperature and low-pressure liquid refrigerant is transported to the evaporator and evaporates from a liquid to a gas, and absorbs a large amount of heat during the evaporation process. Finally, the low-temperature and low-pressure gaseous refrigerant in the evaporator is transported to the compressor and participates in the next cycle. When the air conditioner is cooling, the heat exchanger of the outdoor unit is the condenser, and the heat exchanger of the indoor unit is the evaporator; conversely, when the air conditioner is heating, the heat exchanger of the outdoor unit is the evaporator, and the heat exchanger of the indoor unit is the condenser.

[0025] Regarding the problem of refrigerant leakage, the prior art mainly focuses on two aspects: blocking and recovery.

[0026] 1. For refrigerant blocking technology: The prior art adds electronic expansion valves or cut-off valves at the inlets and outlets of each indoor unit to block the refrigerant leaking in the indoor unit from further flowing into the indoor environment. However, for a multi-connected system with a large number of indoor units, the blocking cost is high, and the refrigerant cannot be recovered, resulting in a large loss of leaked refrigerant cost; and if a single indoor unit leaks, due to the increase in the amount of refrigerant in the refrigerant pipeline, it is easy to cause abnormal system pressure or a fault alarm, making it difficult to maintain the normal operation of the remaining indoor units.

[0027] 2. Refrigerant recovery technology: Currently, in the industry, there are solutions such as using a cut-off valve on the outdoor unit side or a method of recovering the refrigerant outdoors to solve the problem of refrigerant leakage. However, this method is not applicable to the multi-connected air-conditioning system. The multi-connected air-conditioning system has multiple indoor units connected in parallel, and there are limitations on the amount of refrigerant recovered in the multi-connected air-conditioning system, which is likely to cause incomplete refrigerant recovery. In view of the above technical problems, the embodiments of the present application propose a multi-connected air-conditioning hybrid system to solve the problem of incomplete refrigerant recovery in the multi-connected air-conditioning system. By using a hybrid connection method with a cut-off valve box and without a cut-off valve box for system control, cut-off valves are only installed in the valve box and the outdoor unit, reducing the number of cut-off valves used. Moreover, when recovering the refrigerant, only the indoor unit system without a valve box is recovered, and the system with a valve box does not need to be recovered. This reduces the cut-off recovery cost, improves the efficiency of refrigerant recovery, and avoids the problem of incomplete refrigerant recovery.

[0028] Exemplarily, the multi-connected air conditioner provided by the embodiments of the present application includes: an outdoor unit, a plurality of indoor units, and a control unit; the plurality of indoor units include: a first indoor unit and a second indoor unit; a valve box is provided between the first indoor unit and the outdoor unit; no valve box is provided between the second indoor unit and the outdoor unit; refrigerant detectors are provided on the valve box, the first indoor unit, and the second indoor unit; the control unit is configured to determine a safety control strategy corresponding to the target object according to the type of the target object when the refrigerant detector provided on the target object detects refrigerant leakage; the control unit is further configured to execute the safety control strategy corresponding to the target object; wherein, the type of the target object includes any one of the following: valve box, first indoor unit, and second indoor unit.

[0029] For example, as Figure 1 shown, the multi-connected air conditioner includes an outdoor unit and a plurality of indoor units. The indoor units are divided into a first indoor unit with a valve box (such as the indoor unit 11, indoor unit 12, etc. in Figure 1 ) and a second indoor unit without a valve box (such as the indoor unit 4, indoor unit 5, etc. in Figure 1 ), and one valve box can be connected in parallel with multiple indoor units. A refrigerant detector is provided inside each indoor unit, each valve box, and the outdoor unit to detect whether there is refrigerant leakage, and when refrigerant leakage is detected, the refrigerant detector is used to locate the indoor unit, outdoor unit, or valve box where the refrigerant leakage occurs.

[0030] Exemplarily, in the case of refrigerant leakage in the first indoor unit, the control unit is specifically configured to execute a first control strategy corresponding to the target object when the target object is the first indoor unit; wherein, the first control strategy includes: controlling the valve box connected to the target object to close, and controlling the fan of the target object to operate at the maximum speed for a first preset duration; the first preset duration is positively correlated with the evaporator capacity of the target object.

[0031] Exemplarily, when it is determined that the first indoor unit with a valve box has refrigerant leakage, the valve box between the first indoor unit and the outdoor unit can be directly closed, and an alarm prompt can be sent to the user by means of an application program or by emitting an alarm prompt sound. After that, control the fan of the first indoor unit with refrigerant leakage to operate at the maximum speed to reduce the local refrigerant concentration by circulating the indoor refrigerant.

[0032] It should be noted that the purpose of the fan is to reduce the refrigerant concentration in the local area (the area of the indoor unit). Therefore, when the refrigerant is no longer concentrated, the indoor unit can be turned off. Based on this, a duration can be set for the operation of the fan, and this duration is positively correlated with the size (capacity) of the heat exchanger of the indoor unit.

[0033] Exemplarily, as Figure 2 shown, the following are provided on the outdoor unit: an outdoor unit liquid side cut-off valve on the refrigerant pipeline between the outdoor unit and the indoor unit; an outdoor unit gas side cut-off valve on the refrigerant pipeline between the outdoor unit and the indoor unit.

[0034] Exemplarily, in the case of refrigerant leakage in the second indoor unit, the control unit is specifically configured to execute a second control strategy corresponding to the target object when the target object is the second indoor unit; wherein, the second control strategy includes: closing the valve boxes of each first indoor unit on the multi-connected air conditioner, adjusting the operation model of the target object to the cooling mode, controlling the fan of the target object to operate at the maximum speed for a second preset duration, and controlling the operation of the target object according to preset control parameters; the second preset duration is positively correlated with the evaporator capacity of the target object; the preset control parameters include: real-time suction pressure, preset suction pressure threshold, closing duration of the outdoor unit liquid side cut-off valve, preset refrigerant recovery duration.

[0035] Exemplarily, when it is determined that the second indoor unit without a valve box has refrigerant leakage, first close the valve boxes between all the first indoor units and the outdoor unit, then adjust the operation mode of the second indoor unit with refrigerant leakage to the cooling mode. At the same time, control the fan of the second indoor unit to operate at the maximum speed for a first preset duration, and control the operation of the second indoor unit according to the preset control parameters.

[0036] It should be noted that the purpose of controlling the valve boxes between all the first indoor units and the outdoor unit to close is to improve the refrigerant recovery speed of the second indoor unit with refrigerant leakage. After controlling the valve boxes between all the first indoor units and the outdoor unit to close, the circulation of the refrigerant pipeline of the first indoor unit is blocked, and the speed of the refrigerant flowing from the second indoor unit to the outdoor unit will be significantly increased. In this way, the refrigerant recovery speed of the second indoor unit with leakage can be improved, and the refrigerant leakage amount can be reduced.

[0037] Specifically, the control unit is specifically configured to control the outdoor unit gas-side cut-off valve to close when the real-time suction pressure of the target object is less than or equal to the preset suction pressure threshold and the closing duration of the outdoor unit liquid-side cut-off valve is equal to the preset refrigerant recovery duration.

[0038] It can be understood that controlling the second indoor unit with leakage based on the above preset control parameters can transfer the refrigerant in the second indoor unit to the outdoor unit, realize the recovery of the refrigerant, and reduce the risk of safety accidents caused by refrigerant leakage.

[0039] Exemplarily, for the case of refrigerant leakage in the valve box, the control unit is specifically configured to execute a third control strategy corresponding to the target object when the target object is the valve box; wherein, the third control strategy includes: closing the indoor unit, the liquid-side cut-off valve, and the gas-side cut-off valve connected to the target object, and after turning on the ventilation fan for a third preset duration, closing the ventilation fan. If, after closing the ventilation fan, the refrigerant detector in the valve box indicates that the growth rate of the refrigerant content in the valve box is greater than the preset growth rate threshold, then turn off the multi-split air conditioner.

[0040] For example, as Figure 3 shown, it is a schematic structural diagram of the valve box. An air-side cut-off valve is provided on the air pipe (the air pipe in the refrigeration mode) inside the valve box, and a liquid-side cut-off valve is provided on the liquid pipe (the liquid pipe in the refrigeration mode) inside the valve box. At the same time, a relief valve is also provided between the two cut-off valves. When the refrigerant detector inside the valve box detects refrigerant leakage, it is first necessary to close the indoor unit, the liquid-side cut-off valve, and the gas-side cut-off valve connected to the valve box, and perform ventilation through the fan inside the valve box for a third preset duration, then close the fan, and judge the growth rate of the refrigerant inside the valve box. If the growth rate is greater than the preset growth rate threshold, it can be determined that the leakage is on the outdoor unit side. At this time, the operation of the multi-split air conditioner can be directly stopped; if the growth rate is less than or equal to the preset growth rate threshold, it can be determined that the leakage is on the indoor unit side, keep the indoor unit in the closed state, and notify the user for handling.

[0041] Exemplarily, in the case of refrigerant leakage in the outdoor unit, the control unit is specifically configured to execute a fourth control strategy corresponding to the target object when the target object is the outdoor unit; wherein, the fourth control strategy includes: closing the indoor electronic expansion valve on the indoor unit and shutting down the entire multi-connected air conditioner to block the refrigerant leakage on the indoor unit, and at the same time reminding the user to perform maintenance in a timely manner.

[0042] The following will combine the accompanying drawings to elaborate in detail on the refrigerant leakage detection and recovery control method provided by the embodiments of the present application through specific embodiments and their application scenarios.

[0043] As Figure 4 shown, a refrigerant leakage detection and recovery control method provided by an embodiment of the present application may include the following steps 401 and 402: Step 401, when a refrigerant detector provided on the target object detects refrigerant leakage, determine a safety control strategy corresponding to the target object according to the type of the target object.

[0044] Step 402, execute the safety control strategy corresponding to the target object.

[0045] Among them, the type of the target object includes any one of the following: a valve box, a first indoor unit, and a second indoor unit.

[0046] Optionally, in the case of refrigerant leakage in the first indoor unit, step 402 may further include the following step 402a: Step 402a, when the target object is the first indoor unit, execute a first control strategy corresponding to the target object.

[0047] Among them, the first control strategy includes: controlling the valve box connected to the target object to close, and controlling the fan of the target object to operate at the maximum speed for a first preset duration; the first preset duration is positively correlated with the evaporator capacity of the target object.

[0048] Optionally, in the case of refrigerant leakage in the second indoor unit, step 402 may further include the following step 402b: Step 402b, when the target object is the second indoor unit, execute a second control strategy corresponding to the target object.

[0049] Wherein, the second control strategy includes: closing the valve box of each first indoor unit of the multi-connected air conditioner, adjusting the operation model of the target object to the cooling mode, controlling the fan of the target object to operate at the maximum speed for a second preset duration, and controlling the operation of the target object according to preset control parameters; the second preset duration is positively correlated with the evaporator capacity of the target object; the preset control parameters include: real-time suction pressure, preset suction pressure threshold, closing duration of the liquid-side cut-off valve of the outdoor unit, and preset refrigerant recovery duration.

[0050] Specifically, in step 402b above, the step of controlling the operation of the target object according to the preset control parameters may further include the following step 402b1: Step 402b1, when the real-time suction pressure of the target object is less than or equal to the preset suction pressure threshold and the closing duration of the gas-side cut-off valve of the outdoor unit is equal to the preset refrigerant recovery duration, control the gas-side cut-off valve of the outdoor unit to close.

[0051] Optionally, for the case where refrigerant leakage occurs in the valve box, step 402 above may further include the following step 402c: Step 402c, when the target object is the valve box, execute the third control strategy corresponding to the target object.

[0052] Wherein, the third control strategy includes: closing the indoor unit, the liquid-side cut-off valve, and the gas-side cut-off valve connected to the target object, and after turning on the ventilation fan for a third preset duration, turning off the ventilation fan. If, after turning off the ventilation fan, the refrigerant detector in the valve box indicates that the growth rate of the refrigerant content in the valve box is greater than the preset growth rate threshold, then turn off the multi-connected air conditioner.

[0053] Optionally, for the case where refrigerant leakage occurs in the outdoor unit, step 402 above may further include the following step 402d: Step 402d, when the target object is the outdoor unit, execute the fourth control strategy corresponding to the target object.

[0054] Wherein, the fourth control strategy includes: closing the indoor electronic expansion valve on the indoor unit and turning off the entire multi-connected air conditioner to block the refrigerant leakage on the indoor unit, and at the same time reminding the user to perform maintenance in a timely manner.

[0055] The refrigerant leakage detection and recovery control method provided by the embodiments of the present application determines a safety control strategy corresponding to the target object according to the type of the target object when a refrigerant detector provided on the target object detects refrigerant leakage; executes the safety control strategy corresponding to the target object; wherein, the type of the target object includes any one of the following: a valve box, a first indoor unit, and a second indoor unit. In this way, by using the method of mixing and connecting a valve box with a cut-off valve and a valve box without a cut-off valve for refrigerant recovery control, not only the cost is low, the refrigerant recovery speed is fast, but also the safety is higher.

[0056] Figure 5 The schematic physical structure diagram of an electronic device is exemplified. The electronic device may be the above-mentioned air conditioner, such as Figure 5 As shown, the electronic device may include: a processor 510, a communication interface 520, a memory 530, and a communication bus 540. Among them, the processor 510, the communication interface 520, and the memory 530 complete mutual communication through the communication bus 540. The processor 510 can call the logical instructions in the memory 530 to execute the refrigerant leakage detection and recovery control method, and the method includes: when a refrigerant detector provided on the target object detects refrigerant leakage, determining a safety control strategy corresponding to the target object according to the type of the target object; executing the safety control strategy corresponding to the target object; wherein, the type of the target object includes any one of the following: a valve box, a first indoor unit, and a second indoor unit. In this way, by using the method of mixing and connecting a valve box with a cut-off valve and a valve box without a cut-off valve for refrigerant recovery control, not only the cost is low, the refrigerant recovery speed is fast, but also the safety is higher.

[0057] In addition, when the logical instructions in the above-mentioned memory 530 can be implemented in the form of a software functional unit and sold or used as an independent product, they can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present application. And the foregoing storage medium includes: various media such as a USB flash drive, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk, or an optical disc that can store program codes.

[0058] On the other hand, the present application also provides a computer program product, which includes a computer program stored on a computer-readable storage medium. The computer program includes program instructions. When the program instructions are executed by a computer, the computer can execute the refrigerant leakage detection and recovery control method provided by each of the above methods. The method includes: when a refrigerant detector provided on a target object detects refrigerant leakage, determining a safety control strategy corresponding to the target object according to the type of the target object; and executing the safety control strategy corresponding to the target object. Among them, the type of the target object includes any one of the following: a valve box, a first indoor unit, and a second indoor unit. In this way, by using a parallel connection method of a valve box with a cut-off valve and a valve box without a cut-off valve for refrigerant recovery control, not only is the cost low, the refrigerant recovery speed is fast, but also the safety is higher.

[0059] In another aspect, the present application also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it is configured to execute the refrigerant leakage detection and recovery control method provided by each of the above. The method includes: when a refrigerant detector provided on a target object detects refrigerant leakage, determining a safety control strategy corresponding to the target object according to the type of the target object; and executing the safety control strategy corresponding to the target object. Among them, the type of the target object includes any one of the following: a valve box, a first indoor unit, and a second indoor unit. In this way, by using a parallel connection method of a valve box with a cut-off valve and a valve box without a cut-off valve for refrigerant recovery control, not only is the cost low, the refrigerant recovery speed is fast, but also the safety is higher.

[0060] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated. The components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative efforts.

[0061] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, also by hardware. Based on such an understanding, the essence of the above technical solution, or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present application.

Claims

1. A multi-connected air conditioner, characterized in that, The multi-connected air conditioner includes: an outdoor unit, a plurality of indoor units, and a control unit; the plurality of indoor units include: a first indoor unit and a second indoor unit; a valve box is provided between the first indoor unit and the outdoor unit; no valve box is provided between the second indoor unit and the outdoor unit; refrigerant detectors are provided on the valve box, the first indoor unit, and the second indoor unit. The control unit is configured to, when the refrigerant detector provided on the target object detects refrigerant leakage, determine a safety control strategy corresponding to the target object according to the type of the target object. The control unit is further configured to execute the safety control strategy corresponding to the target object. Wherein, the type of the target object includes any one of the following: a valve box, a first indoor unit, and a second indoor unit.

2. The multi-connected air conditioner according to claim 1, wherein The control unit is specifically configured to, when the target object is the first indoor unit, execute a first control strategy corresponding to the target object. Wherein, the first control strategy includes: controlling the valve box connected to the target object to close, and controlling the fan of the target object to operate at the maximum speed for a first preset duration; the first preset duration is positively correlated with the evaporator capacity of the target object.

3. The multi-connected air conditioner according to claim 1 or 2, characterized in that, An outdoor liquid-side cut-off valve is provided on the refrigerant pipeline between the outdoor unit and the indoor unit on the outdoor unit. The control unit is specifically configured to, when the target object is the second indoor unit, execute a second control strategy corresponding to the target object. Wherein, the second control strategy includes: closing the valve box of each first indoor unit on the multi-connected air conditioner, adjusting the operation model of the target object to the cooling mode, controlling the fan of the target object to operate at the maximum speed for a second preset duration, and controlling the operation of the target object according to preset control parameters; the second preset duration is positively correlated with the evaporator capacity of the target object; the preset control parameters include: the real-time suction pressure, a preset suction pressure threshold, the closing duration of the outdoor liquid-side cut-off valve, and a preset refrigerant recovery duration.

4. The multi-connected air conditioner according to claim 3, characterized in that, An outdoor gas-side cut-off valve is provided on the refrigerant pipeline between the outdoor unit and the indoor unit on the outdoor unit. The control unit is specifically configured to control the outdoor gas-side cut-off valve to close when the real-time suction pressure of the target object is less than or equal to the preset suction pressure threshold and the closing duration of the outdoor gas-side cut-off valve is equal to the preset refrigerant recovery duration.

5. The multi-connected air conditioner according to any one of claims 1 to 4, characterized in that A ventilation fan, a liquid-side cut-off valve, and a gas-side cut-off valve are provided on the valve box; a pressure relief valve is provided between the liquid-side cut-off valve and the gas-side cut-off valve. The control unit is specifically configured to, when the target object is the valve box, execute a third control strategy corresponding to the target object. Among them, the third control strategy includes: closing the indoor unit, the liquid-side cut-off valve, and the gas-side stop valve connected to the target object, and after turning on the ventilation fan for a third preset duration, closing the ventilation fan. If, after closing the ventilation fan, the refrigerant detector in the valve box indicates that the growth rate of the refrigerant content in the valve box is greater than the preset growth rate threshold, then turn off the multi-connected air conditioner.

6. A refrigerant leakage detection and recovery control method, characterized in that Applied to the multi-connected air conditioner according to any one of claims 1 to 5, the method includes: When the refrigerant detector provided on the target object detects refrigerant leakage, determining a safety control strategy corresponding to the target object according to the type of the target object; Executing the safety control strategy corresponding to the target object; Among them, the type of the target object includes any one of the following: a valve box, a first indoor unit, and a second indoor unit.

7. The refrigerant leakage detection and recovery control method according to claim 6, characterized in that, The executing the safety control strategy corresponding to the target object includes: When the target object is a first indoor unit, executing a first control strategy corresponding to the target object; Among them, the first control strategy includes: controlling the valve box connected to the target object to close, and controlling the fan of the target object to operate at the maximum speed for a first preset duration; the first preset duration is positively correlated with the evaporator capacity of the target object.

8. The refrigerant leakage detection and recovery control method according to claim 6 or 7, characterized in that An outdoor unit liquid-side cut-off valve is provided on the outdoor unit; The executing the safety control strategy corresponding to the target object includes: When the target object is a second indoor unit, executing a second control strategy corresponding to the target object; Among them, the second control strategy includes: closing the valve boxes of each first indoor unit on the multi-connected air conditioner, adjusting the operation model of the target object to the cooling mode, controlling the fan of the target object to operate at the maximum speed for a second preset duration, and controlling the operation of the target object according to preset control parameters; the second preset duration is positively correlated with the evaporator capacity of the target object; the preset control parameters include: the real-time suction pressure, the preset suction pressure threshold, the closing duration of the outdoor unit liquid-side cut-off valve, and the preset refrigerant recovery duration.

9. The refrigerant leakage detection and recovery control method according to claim 8, wherein An outdoor unit gas-side stop valve is provided on the outdoor unit; The controlling the operation of the target object according to preset control parameters includes: When the real-time suction pressure of the target object is less than or equal to the preset suction pressure threshold and the closing duration of the outdoor unit gas-side stop valve is equal to the preset refrigerant recovery duration, controlling the outdoor unit gas-side stop valve to close.

10. The multi-connected air conditioner according to any one of claims 6 to 9, characterized in that, A ventilation fan, a liquid-side cut-off valve, and a gas-side stop valve are provided on the valve box; a pressure relief valve is provided between the liquid-side cut-off valve and the gas-side stop valve; The executing the safety control strategy corresponding to the target object includes: When the target object is a valve box, executing a third control strategy corresponding to the target object; Among them, the third control strategy includes: closing the indoor unit, the liquid-side cut-off valve, and the gas-side stop valve connected to the target object, and after turning on the ventilation fan for a third preset duration, closing the ventilation fan. If, after closing the ventilation fan, the refrigerant detector in the valve box indicates that the growth rate of the refrigerant content in the valve box is greater than the preset growth rate threshold, then turn off the multi-connected air conditioner.

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