Refrigeration regulation and control method and device of multi-split air conditioner and air conditioner

Abstract

The invention provides a refrigeration regulation and control method and device of a multi-split air conditioner and the air conditioner, and is applied to the field of air conditioner control. The method comprises the steps that after the multi-split air conditioner is in a refrigeration mode and operates for a preset operation duration, the average liquid pipe temperature of each indoor unit in a plurality of indoor units is obtained; the average liquid pipe temperature is the average temperature of the liquid pipe of the indoor unit within the preset operation duration; a liquid pipe temperature difference value between the average liquid pipe temperature of each indoor unit and the standard liquid pipe temperature is calculated, and the indoor units with the liquid pipe temperature difference values exceeding a first temperature difference threshold value are determined as indoor units to be adjusted; and operation control is conducted on the to-be-adjusted indoor units in sequence according to the operation sequence in the operation combination till the to-be-adjusted indoor units meet the preset stop condition. According to the refrigeration regulation and control method and device of the multi-split air conditioner and the air conditioner, the air outlet effects of the indoor units of the multi-split air conditioner are kept consistent through the reasonable control method, and the use experience of a user is improved.

Description

Technical Field

[0001] This application relates to the field of air conditioner control, and in particular, to a refrigeration regulation method, device and air conditioner for a multi-connected air conditioner. Background Art

[0002] With the continuous improvement of people's living standards and the continuous improvement of the intelligent level of household 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 refrigeration in summer to lower the indoor temperature.

[0003] A multi-connected air conditioner is an air conditioning system that can connect multiple indoor units. They are usually used for cooling and ventilation in large rooms or multiple rooms. The advantage of this air conditioning system is that it can provide a more uniform cooling effect and save energy at the same time.

[0004] However, due to the different installation scenarios of each indoor unit and the influence of factors such as the distance from the indoor unit to the outdoor unit, the problem of inconsistent air outlet effects of the indoor units may occur. Summary of the Invention

[0005] The purpose of this application is to provide a refrigeration regulation method, device and air conditioner for a multi-connected air conditioner, which can make the air outlet effects of the indoor units of the multi-connected air conditioner consistent through a reasonable control method, and improve the user experience.

[0006] This application provides a refrigeration regulation method for a multi-connected air conditioner, including: After the multi-connected air conditioner is in the refrigeration mode and runs for a preset operation duration, obtain the average liquid pipe temperature of each indoor unit among the multiple indoor units; the average liquid pipe temperature is: the average temperature of the liquid pipe of the indoor unit within the preset operation duration; calculate the liquid pipe temperature difference between the average liquid pipe temperature of each indoor unit and the standard liquid pipe temperature, and determine the indoor unit with the liquid pipe temperature difference exceeding the first temperature difference threshold as the indoor unit to be adjusted; perform operation control on the indoor units to be adjusted in sequence according to the operation sequence in the operation combination until the indoor units to be adjusted meet the preset stop condition; wherein, the operation combination includes: adjusting the target superheat degree based on the liquid pipe temperature difference, and adjusting the opening degree of the subcooling valve based on the exhaust temperature difference between the preset exhaust temperature and the actual exhaust temperature.

[0007] Optionally, the performing operation control on the indoor units to be adjusted in sequence according to the operation sequence in the operation combination until the indoor units to be adjusted meet the preset stop condition includes: when the liquid pipe temperature difference of the indoor unit to be adjusted is greater than the first temperature difference threshold, gradually reduce the target superheat degree of the indoor unit to be adjusted until the liquid pipe temperature difference of the indoor unit to be adjusted is less than the second temperature difference threshold; wherein, the second temperature difference threshold is less than the first temperature difference threshold.

[0008] Optionally, operating and controlling the indoor units to be adjusted in sequence according to the operation sequence in the operation combination until the indoor units to be adjusted meet the preset stop condition, includes: when the decrease in the target superheat degree of the indoor unit to be adjusted reaches the preset amplitude threshold, if the liquid pipe temperature difference of the indoor unit to be adjusted is greater than or equal to the second temperature difference threshold, adjusting the opening degree of the subcooling valve based on the exhaust temperature difference between the preset exhaust temperature and the actual exhaust temperature until the preset stop condition is met.

[0009] Optionally, adjusting the opening degree of the subcooling valve based on the exhaust temperature difference between the preset exhaust temperature and the actual exhaust temperature until the preset stop condition is met, includes: when the exhaust temperature difference of the indoor unit to be adjusted is greater than the third temperature difference threshold, gradually reducing the opening degree of the subcooling valve of the indoor unit to be adjusted until the decrease in the air outlet temperature reaches the preset temperature decrease, and then keeping the opening degree of the subcooling valve of the indoor unit to be adjusted unchanged.

[0010] Optionally, adjusting the opening degree of the subcooling valve based on the exhaust temperature difference between the preset exhaust temperature and the actual exhaust temperature until the preset stop condition is met, includes: when the exhaust temperature difference of the indoor unit to be adjusted is greater than the third temperature difference threshold, gradually reducing the opening degree of the subcooling valve of the indoor unit to be adjusted until the exhaust temperature difference of the indoor unit to be adjusted is equal to the fourth temperature difference threshold, and then keeping the opening degree of the subcooling valve of the indoor unit to be adjusted unchanged.

[0011] Optionally, adjusting the opening degree of the subcooling valve based on the exhaust temperature difference between the preset exhaust temperature and the actual exhaust temperature until the preset stop condition is met, includes: when the exhaust temperature difference of the indoor unit to be adjusted is less than or equal to the third temperature difference threshold, keeping the opening degree of the subcooling valve of the indoor unit to be adjusted unchanged.

[0012] The present application also provides a refrigeration control device for a multi-connected air conditioner, including: An acquisition module, configured to acquire the average liquid pipe temperature of each indoor unit in the multi-connected air conditioner after the multi-connected air conditioner is in the refrigeration mode and operates for a preset operation duration; the average liquid pipe temperature is: the average temperature of the liquid pipe of the indoor unit during the preset operation duration; a calculation module, configured to calculate the liquid pipe temperature difference between the average liquid pipe temperature of each indoor unit and the standard liquid pipe temperature; a determination module, configured to determine the indoor unit with the liquid pipe temperature difference exceeding the first temperature difference threshold as the indoor unit to be adjusted; a control module, configured to operate and control the indoor units to be adjusted in sequence according to the operation sequence in the operation combination until the indoor units to be adjusted meet the preset stop condition; wherein, the operation combination includes: adjusting the target superheat degree based on the liquid pipe temperature difference, and adjusting the opening degree of the subcooling valve based on the exhaust temperature difference between the preset exhaust temperature and the actual exhaust temperature.

[0013] Optionally, the control module is specifically configured to gradually reduce the target superheat degree of the indoor unit to be adjusted until the liquid pipe temperature difference of the indoor unit to be adjusted is less than a second temperature difference threshold when the liquid pipe temperature difference of the indoor unit to be adjusted is greater than a first temperature difference threshold; wherein, the second temperature difference threshold is less than the first temperature difference threshold.

[0014] Optionally, the control module is specifically configured to, when the reduction amplitude of the target superheat degree of the indoor unit to be adjusted reaches a preset amplitude threshold, if the liquid pipe temperature difference of the indoor unit to be adjusted is greater than or equal to the second temperature difference threshold, adjust the opening degree of the subcooling valve based on the exhaust temperature difference between the preset exhaust temperature and the actual exhaust temperature until a preset stop condition is met.

[0015] Optionally, the control module is specifically configured to gradually reduce the opening degree of the subcooling valve of the indoor unit to be adjusted until the reduction amplitude of the air outlet temperature reaches a preset temperature reduction amplitude and then keep the opening degree of the subcooling valve of the indoor unit to be adjusted unchanged when the exhaust temperature difference of the indoor unit to be adjusted is greater than a third temperature difference threshold.

[0016] Optionally, the control module is specifically configured to gradually reduce the opening degree of the subcooling valve of the indoor unit to be adjusted until the exhaust temperature difference of the indoor unit to be adjusted is equal to a fourth temperature difference threshold and then keep the opening degree of the subcooling valve of the indoor unit to be adjusted unchanged when the exhaust temperature difference of the indoor unit to be adjusted is greater than a third temperature difference threshold.

[0017] Optionally, the control module is specifically configured to keep the opening degree of the subcooling valve of the indoor unit to be adjusted unchanged when the exhaust temperature difference of the indoor unit to be adjusted is less than or equal to the third temperature difference threshold.

[0018] The present application also provides a computer program product, including a computer program / instructions, which when executed by a processor, implement the steps of the refrigeration control method of the multi-connected air conditioner as described in any one of the above.

[0019] The present application also provides an electronic device, which can be an air conditioner. 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 refrigeration control method of the multi-connected air conditioner as described in any one of the above.

[0020] The present application also provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, it implements the steps of the refrigeration control method of the multi-connected air conditioner as described in any one of the above.

[0021] The refrigeration control method, device and air conditioner of the multi-connected air conditioner provided by the present application. First, after the multi-connected air conditioner is in the refrigeration mode and operates for a preset operation duration, the average liquid pipe temperature of each indoor unit among the multiple indoor units is obtained; the average liquid pipe temperature is: the average temperature of the liquid pipe of the indoor unit within the preset operation duration; then, the liquid pipe temperature difference between the average liquid pipe temperature of each indoor unit and the standard liquid pipe temperature is calculated, and the indoor unit with the liquid pipe temperature difference exceeding the first temperature difference threshold is determined as the indoor unit to be adjusted; finally, the indoor unit to be adjusted is sequentially controlled according to the operation sequence in the operation combination until the indoor unit to be adjusted meets the preset stop condition; wherein, the operation combination includes: adjusting the target superheat degree based on the liquid pipe temperature difference, and adjusting the opening degree of the sub-cooling valve based on the exhaust temperature difference between the preset exhaust temperature and the actual exhaust temperature. In this way, through a reasonable control method, the air outlet effects of the indoor units of the multi-connected air conditioner are kept consistent, and the user experience is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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 the description of the embodiments or 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.

[0023] Figure 1 is a schematic diagram of the operating principle of the air conditioner provided by the present application; Figure 2 is one of the flow charts of the refrigeration control method of the multi-connected air conditioner provided by the present application; Figure 3 is the second flow chart of the refrigeration control method of the multi-connected air conditioner provided by the present application; Figure 4 is a schematic diagram of the structure of the refrigeration control device of the multi-connected air conditioner provided by the present application; Figure 5 is a schematic diagram of the structure of the electronic device provided by the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] To make the purpose, technical solutions and advantages of the present application clearer, the following will clearly and completely describe the technical solutions in the present application with reference to the drawings in the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present application.

[0025] The terms "first", "second", etc. in the description and claims of this application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of this application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are usually of the same category, and the number of objects is not limited. For example, the first object can be one or more. 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.

[0026] The operating principle of the air conditioner involved in the embodiments of this application is described in detail below: As Figure 1 shown, 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. After that, the medium-temperature and high-pressure liquid refrigerant is depressurized through a capillary tube (throttling unit) and becomes a low-temperature and low-pressure liquid refrigerant. 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.

[0027] Aiming at the technical problem that the air outlet effects of the indoor units of a multi-connected air conditioner are inconsistent in the related art, the embodiments of this application ensure that the air outlet effects of multiple indoor units are kept consistent to a certain extent through a control method of adjusting the target superheat based on the liquid pipe temperature difference and adjusting the opening of the subcooling valve based on the exhaust temperature difference between the preset exhaust temperature and the actual exhaust temperature, greatly improving the user experience.

[0028] The refrigeration control method of the multi-connected air conditioner provided by the embodiments of this application is described in detail below with reference to the drawings and through specific embodiments and their application scenarios.

[0029] As Figure 2 shown, a refrigeration control method of a multi-connected air conditioner provided by an embodiment of this application may include the following steps 201 to step 203: Step 201, after the multi-connected air conditioner is in the cooling mode and runs for a preset operation duration, obtain the average liquid pipe temperature of each indoor unit among the multiple indoor units.

[0030] Wherein, the average liquid pipe temperature is: the average temperature of the liquid pipe of the indoor unit within the preset operation duration.

[0031] Exemplarily, in the embodiments of the present application, it is determined whether the indoor unit needs to be adjusted by the average temperature of the liquid pipe of the indoor unit. The average liquid pipe temperature of the indoor unit can be calculated by calculating the average temperature of the liquid pipe within the preset operation duration (for example, one hour) after the air conditioner operates in the cooling mode.

[0032] Step 202: Calculate the liquid pipe temperature difference between the average liquid pipe temperature of each indoor unit and the standard liquid pipe temperature, and determine the indoor units with the liquid pipe temperature difference exceeding the first temperature difference threshold as the indoor units to be adjusted.

[0033] Exemplarily, after obtaining the average liquid pipe temperature of each indoor unit, calculate the liquid pipe temperature difference between the average liquid pipe temperature of each indoor unit and the standard liquid pipe temperature corresponding to each indoor unit, and determine whether to adjust the indoor unit based on the magnitude of the liquid pipe temperature difference.

[0034] It should be noted that the standard liquid pipe temperatures corresponding to each indoor unit can be the same or different. The standard liquid pipe temperature can be adjusted according to the operating parameters of the indoor unit or can be a preset value. For the indoor units with the liquid pipe temperature difference less than or equal to the first temperature difference threshold, no adjustment is required.

[0035] Step 203: Perform operation control on the indoor units to be adjusted in sequence according to the operation sequence in the operation combination until the indoor units to be adjusted meet the preset stop condition.

[0036] Wherein, the operation combination includes: adjusting the target superheat degree based on the liquid pipe temperature difference, and adjusting the opening degree of the subcooling valve based on the exhaust temperature difference between the preset exhaust temperature and the actual exhaust temperature.

[0037] Exemplarily, after determining the indoor units to be adjusted that need to be adjusted from multiple indoor units, adjustment can be performed on them through the operation combination.

[0038] It should be noted that the operations in the above operation combination need to be executed in sequence, that is, when the previous operation cannot meet the adjustment target, the subsequent operation needs to be executed until the indoor unit to be adjusted meets the preset stop condition. The preset stop conditions corresponding to different operations are different.

[0039] Specifically, for the above-mentioned previously executed adjustment operation, the above step 203 may further include the following step 203a: Step 203a: When the liquid pipe temperature difference of the indoor unit to be adjusted is greater than the first temperature difference threshold, gradually reduce the target superheat of the indoor unit to be adjusted until the liquid pipe temperature difference of the indoor unit to be adjusted is less than the second temperature difference threshold.

[0040] Wherein, the second temperature difference threshold is less than the first temperature difference threshold.

[0041] Exemplarily, in the embodiments of the present application, after determining the indoor unit to be adjusted that needs to be regulated, first improve the air outlet effect of the indoor unit to be adjusted by reducing the target superheat. If the liquid pipe temperature difference of the indoor unit to be adjusted can be reduced to the required range, the regulation of the indoor unit to be adjusted is completed.

[0042] For example, as Figure 3 shown, after the multi-connected air conditioner operates for a preset operation duration in the cooling mode, calculate the average value of the inner coil temperatures of each indoor unit Ta (i.e., the average liquid pipe temperature of the above indoor unit). After that, calculate the average liquid pipe temperature of each indoor unit Ta and the difference Tc from the standard liquid pipe temperature , that is . Finally, judge whether it is greater than 3°C. If so, determine this indoor unit as the indoor unit to be adjusted and reduce the target superheat of this indoor unit. Otherwise, the target superheat of this indoor unit remains unchanged. The target superheat of the indoor unit to be adjusted can be reduced by 1°C each time, and then judged every 30 minutes. If it does not meet less than 1°C, continue to reduce the target superheat; the target superheat is reduced by at most 3°C.

[0043] Specifically, for the above-mentioned regulation operation performed later, the above step 203 may further include the following step 203b: Step 203b: When the decrease in the target superheat of the indoor unit to be adjusted reaches the preset amplitude threshold, if the liquid pipe temperature difference of the indoor unit to be adjusted is greater than or equal to the second temperature difference threshold, adjust the opening of the sub-cooling valve based on the exhaust temperature difference between the preset exhaust temperature and the actual exhaust temperature until the preset stop condition is met.

[0044] Exemplarily, when the liquid pipe temperature difference of the indoor unit to be adjusted still cannot be reduced to a range less than the second temperature difference threshold by reducing the target superheat, it is necessary to further regulate the indoor unit to be adjusted by adjusting the opening of the sub-cooling valve.

[0045] For example, as Figure 3As shown, when the decrease in the target superheat of the indoor unit to be adjusted reaches 3°C (i.e., the above-mentioned preset amplitude threshold), and the liquid pipe temperature difference of the indoor unit to be adjusted is still greater than or equal to 1°C (i.e., the above-mentioned second temperature difference threshold), the target superheat cannot be reduced any further. At this time, it is necessary to reduce the refrigerant bypass flow of the outdoor unit by reducing the opening of the subcooling valve, increase the refrigerant circulation volume of the indoor unit, and improve the air outlet effect.

[0046] Specifically, the step of adjusting by reducing the opening of the subcooling valve in the above step 203 may further include the following step 203c1: Step 203c1: When the exhaust temperature difference of the indoor unit to be adjusted is greater than the third temperature difference threshold, gradually reduce the opening of the subcooling valve of the indoor unit to be adjusted until the decrease in the air outlet temperature reaches the preset temperature decrease, and then keep the opening of the subcooling valve of the indoor unit to be adjusted unchanged.

[0047] Specifically, the step of adjusting by reducing the opening of the subcooling valve in the above step 203 may further include the following step 203c2: Step 203c2: When the exhaust temperature difference of the indoor unit to be adjusted is greater than the third temperature difference threshold, gradually reduce the opening of the subcooling valve of the indoor unit to be adjusted until the exhaust temperature difference of the indoor unit to be adjusted is equal to the fourth temperature difference threshold, and then keep the opening of the subcooling valve of the indoor unit to be adjusted unchanged.

[0048] Specifically, the step of adjusting by reducing the opening of the subcooling valve in the above step 203 may further include the following step 203c3: Step 203c3: When the exhaust temperature difference of the indoor unit to be adjusted is less than or equal to the third temperature difference threshold, keep the opening of the subcooling valve of the indoor unit to be adjusted unchanged.

[0049] For example, as Figure 3 shown, when adjusting by reducing the opening of the subcooling valve, first determine whether the exhaust temperature difference (i.e., Tq - Td) of the indoor unit to be adjusted is greater than 6°C (i.e., the above-mentioned third temperature difference threshold). If so, reduce the opening of the subcooling valve; otherwise, do not adjust the opening of the subcooling valve. After adjusting the opening of the subcooling valve, judge once every 30 minutes. If the decrease in the air outlet temperature within 30 minutes is greater than 2°C (i.e., the above-mentioned preset temperature decrease), then stop adjusting the opening of the subcooling valve; otherwise, continue to reduce the opening of the subcooling valve until the exhaust temperature difference of the indoor unit to be adjusted decreases from 6°C to 3°C, that is, the exhaust temperature difference of the indoor unit to be adjusted is equal to the fourth temperature difference threshold.

[0050] The refrigeration control method of the multi-connected air conditioner provided by the embodiment of the present application. First, after the multi-connected air conditioner is in the refrigeration mode and runs for a preset operation duration, the average liquid pipe temperature of each indoor unit among the multiple indoor units is obtained; the average liquid pipe temperature is: the average temperature of the liquid pipe of the indoor unit within the preset operation duration; then, the liquid pipe temperature difference between the average liquid pipe temperature of each indoor unit and the standard liquid pipe temperature is calculated, and the indoor unit with the liquid pipe temperature difference exceeding the first temperature difference threshold is determined as the indoor unit to be adjusted; finally, the indoor unit to be adjusted is sequentially controlled according to the operation sequence in the operation combination until the indoor unit to be adjusted meets the preset stop condition; wherein, the operation combination includes: adjusting the target superheat degree based on the liquid pipe temperature difference, and adjusting the opening degree of the subcooling valve based on the exhaust temperature difference between the preset exhaust temperature and the actual exhaust temperature. In this way, through a reasonable control method, the air outlet effect of the indoor units of the multi-connected air conditioner is kept consistent, improving the user experience.

[0051] It should be noted that for the refrigeration control method of the multi-connected air conditioner provided by the embodiment of the present application, the execution subject can be the refrigeration control device of the multi-connected air conditioner, or the control module in the refrigeration control device of the multi-connected air conditioner for executing the refrigeration control method of the multi-connected air conditioner. In the embodiment of the present application, taking the refrigeration control device of the multi-connected air conditioner executing the refrigeration control method of the multi-connected air conditioner as an example, the refrigeration control device of the multi-connected air conditioner provided by the embodiment of the present application is described.

[0052] It should be noted that in the embodiment of the present application, the refrigeration control methods of the multi-connected air conditioner shown in the above respective method drawings are all exemplarily described by taking one drawing in the embodiment of the present application as an example. Specifically in implementation, the refrigeration control methods of the multi-connected air conditioner shown in the above respective method drawings can also be implemented in combination with any other combinable drawings schemed in the above embodiments, which will not be elaborated here.

[0053] The refrigeration control device of the multi-connected air conditioner provided by the present application is described below, and the following description can be mutually referred to corresponding to the refrigeration control method of the multi-connected air conditioner described above.

[0054] Figure 4 is a schematic structural diagram of the refrigeration control device of the multi-connected air conditioner provided by an embodiment of the present application, as Figure 4 shown, specifically including: An acquisition module 401 is configured to acquire the average liquid pipe temperature of each indoor unit among the multiple indoor units after the multi-connected air conditioner is in the cooling mode and operates for a preset operation duration; the average liquid pipe temperature is the average temperature of the liquid pipe of the indoor unit within the preset operation duration; a calculation module 402 is configured to calculate the liquid pipe temperature difference between the average liquid pipe temperature of each indoor unit and the standard liquid pipe temperature; a determination module 403 is configured to determine the indoor unit with the liquid pipe temperature difference exceeding the first temperature difference threshold as the indoor unit to be adjusted; a control module 404 is configured to perform operation control on the indoor units to be adjusted in sequence according to the operation sequence in the operation combination until the indoor units to be adjusted meet the preset stop condition; wherein, the operation combination includes: adjusting the target superheat degree based on the liquid pipe temperature difference, and adjusting the opening degree of the sub-cooling valve based on the exhaust temperature difference between the preset exhaust temperature and the actual exhaust temperature.

[0055] Optionally, the control module 404 is specifically configured to, when the liquid pipe temperature difference of the indoor unit to be adjusted is greater than the first temperature difference threshold, gradually reduce the target superheat degree of the indoor unit to be adjusted until the liquid pipe temperature difference of the indoor unit to be adjusted is less than the second temperature difference threshold; wherein, the second temperature difference threshold is less than the first temperature difference threshold.

[0056] Optionally, the control module 404 is specifically configured to, when the reduction amplitude of the target superheat degree of the indoor unit to be adjusted reaches the preset amplitude threshold, if the liquid pipe temperature difference of the indoor unit to be adjusted is greater than or equal to the second temperature difference threshold, adjust the opening degree of the sub-cooling valve based on the exhaust temperature difference between the preset exhaust temperature and the actual exhaust temperature until the preset stop condition is met.

[0057] Optionally, the control module 404 is specifically configured to, when the exhaust temperature difference of the indoor unit to be adjusted is greater than the third temperature difference threshold, gradually reduce the opening degree of the sub-cooling valve of the indoor unit to be adjusted until the reduction amplitude of the air outlet temperature reaches the preset temperature reduction amplitude, and then keep the opening degree of the sub-cooling valve of the indoor unit to be adjusted unchanged.

[0058] Optionally, the control module 404 is specifically configured to, when the exhaust temperature difference of the indoor unit to be adjusted is greater than the third temperature difference threshold, gradually reduce the opening degree of the sub-cooling valve of the indoor unit to be adjusted until the exhaust temperature difference of the indoor unit to be adjusted is equal to the fourth temperature difference threshold, and then keep the opening degree of the sub-cooling valve of the indoor unit to be adjusted unchanged.

[0059] Optionally, the control module 404 is specifically configured to, when the exhaust temperature difference of the indoor unit to be adjusted is less than or equal to the third temperature difference threshold, keep the opening degree of the sub-cooling valve of the indoor unit to be adjusted unchanged.

[0060] The refrigeration control device of the multi-connected air conditioner provided by this application first obtains the average liquid pipe temperature of each indoor unit among the multiple indoor units after the multi-connected air conditioner is in the refrigeration mode and operates for a preset operation duration; the average liquid pipe temperature is the average temperature of the liquid pipe of the indoor unit within the preset operation duration; then, calculates the liquid pipe temperature difference between the average liquid pipe temperature of each indoor unit and the standard liquid pipe temperature, and determines the indoor unit with the liquid pipe temperature difference exceeding the first temperature difference threshold as the indoor unit to be adjusted; finally, performs operation control on the indoor units to be adjusted in sequence according to the operation sequence in the operation combination until the indoor units to be adjusted meet the preset stop condition; wherein, the operation combination includes: adjusting the target superheat degree based on the liquid pipe temperature difference, and adjusting the opening degree of the sub-cooling valve based on the exhaust temperature difference between the preset exhaust temperature and the actual exhaust temperature. In this way, through a reasonable control method, the air outlet effect of the indoor units of the multi-connected air conditioner is kept consistent, improving the user experience.

[0061] Figure 5 An example of the schematic physical structure of an electronic device, which can be the above-mentioned air conditioner, is as follows 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 communicate with each other through the communication bus 540. The processor 510 can call the logical instructions in the memory 530 to execute the refrigeration control method of the multi-connected air conditioner, and the method includes: obtaining the average liquid pipe temperature of each indoor unit among the multiple indoor units after the multi-connected air conditioner is in the refrigeration mode and operates for a preset operation duration; the average liquid pipe temperature is the average temperature of the liquid pipe of the indoor unit within the preset operation duration; calculating the liquid pipe temperature difference between the average liquid pipe temperature of each indoor unit and the standard liquid pipe temperature, and determining the indoor unit with the liquid pipe temperature difference exceeding the first temperature difference threshold as the indoor unit to be adjusted; performing operation control on the indoor units to be adjusted in sequence according to the operation sequence in the operation combination until the indoor units to be adjusted meet the preset stop condition; wherein, the operation combination includes: adjusting the target superheat degree based on the liquid pipe temperature difference, and adjusting the opening degree of the sub-cooling valve based on the exhaust temperature difference between the preset exhaust temperature and the actual exhaust temperature.

[0062] In addition, when the logical instructions in the above-mentioned memory 530 are implemented in the form of software functional units and sold or used as independent products, 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 the 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. The aforementioned storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs that can store program codes.

[0063] On the other hand, the present application also provides a computer program product. The computer program product 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 cooling control method of the multi-connected air conditioner provided by the above-mentioned various methods. The method includes: after the multi-connected air conditioner is in the cooling mode and runs for a preset operation duration, obtaining the average liquid pipe temperature of each indoor unit among the multiple indoor units; the average liquid pipe temperature is: the average temperature of the liquid pipe of the indoor unit within the preset operation duration; calculating the liquid pipe temperature difference between the average liquid pipe temperature of each indoor unit and the standard liquid pipe temperature, and determining the indoor unit with the liquid pipe temperature difference exceeding the first temperature difference threshold as the indoor unit to be adjusted; performing operation control on the indoor unit to be adjusted in sequence according to the operation sequence in the operation combination until the indoor unit to be adjusted meets the preset stop condition; where the operation combination includes: adjusting the target superheat degree based on the liquid pipe temperature difference, and adjusting the opening degree of the subcooling valve based on the exhaust temperature difference between the preset exhaust temperature and the actual exhaust temperature.

[0064] 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 refrigeration control method of the multi-connected air conditioner provided above. The method includes: after the multi-connected air conditioner is in the refrigeration mode and operates for a preset operation duration, obtaining the average liquid pipe temperature of each indoor unit among the multiple indoor units; the average liquid pipe temperature is: the average temperature of the liquid pipe of the indoor unit within the preset operation duration; calculating the liquid pipe temperature difference between the average liquid pipe temperature of each indoor unit and the standard liquid pipe temperature, and determining the indoor unit with the liquid pipe temperature difference exceeding the first temperature difference threshold as the indoor unit to be adjusted; performing operation control on the indoor units to be adjusted in sequence according to the operation sequence in the operation combination until the indoor units to be adjusted meet the preset stop condition; wherein, the operation combination includes: adjusting the target superheat degree based on the liquid pipe temperature difference, and adjusting the opening degree of the sub-cooling valve based on the exhaust temperature difference between the preset exhaust temperature and the actual exhaust temperature.

[0065] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or 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 labor.

[0066] 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, it can also be implemented by hardware. Based on this 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 can 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.

[0067] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit 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 on 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 each embodiment of the present application.

Claims

1. A refrigeration control method for a multi-connected air conditioner, characterized in that, Applied to a multi-connected air conditioner, the multi-connected air conditioner includes a plurality of indoor units, and the method includes: After the multi-connected air conditioner is in the cooling mode and operates for a preset operation duration, obtain the average liquid pipe temperature of each indoor unit among the plurality of indoor units; the average liquid pipe temperature is: the average temperature of the liquid pipe of the indoor unit within the preset operation duration; Calculate the liquid pipe temperature difference between the average liquid pipe temperature of each indoor unit and the standard liquid pipe temperature, and determine the indoor unit with the liquid pipe temperature difference exceeding the first temperature difference threshold as the indoor unit to be adjusted; Perform operation control on the indoor units to be adjusted in sequence according to the operation sequence in the operation combination until the indoor units to be adjusted meet the preset stop conditions; Wherein, the operation combination includes: adjusting the target superheat based on the liquid pipe temperature difference, and adjusting the opening degree of the subcooling valve based on the exhaust temperature difference between the preset exhaust temperature and the actual exhaust temperature.

2. The method according to claim 1, wherein The performing operation control on the indoor units to be adjusted in sequence according to the operation sequence in the operation combination until the indoor units to be adjusted meet the preset stop conditions includes: When the liquid pipe temperature difference of the indoor unit to be adjusted is greater than the first temperature difference threshold, gradually reduce the target superheat of the indoor unit to be adjusted until the liquid pipe temperature difference of the indoor unit to be adjusted is less than the second temperature difference threshold; Wherein, the second temperature difference threshold is less than the first temperature difference threshold.

3. The method according to claim 2, wherein The performing operation control on the indoor units to be adjusted in sequence according to the operation sequence in the operation combination until the indoor units to be adjusted meet the preset stop conditions includes: When the reduction amplitude of the target superheat of the indoor unit to be adjusted reaches the preset amplitude threshold, if the liquid pipe temperature difference of the indoor unit to be adjusted is greater than or equal to the second temperature difference threshold, then adjust the opening degree of the subcooling valve based on the exhaust temperature difference between the preset exhaust temperature and the actual exhaust temperature until the preset stop conditions are met.

4. The method according to any one of claims 1 to 3, characterized in that, The adjusting the opening degree of the subcooling valve based on the exhaust temperature difference between the preset exhaust temperature and the actual exhaust temperature until the preset stop conditions are met includes: When the exhaust temperature difference of the indoor unit to be adjusted is greater than the third temperature difference threshold, gradually reduce the opening degree of the subcooling valve of the indoor unit to be adjusted until the reduction amplitude of the outlet air temperature reaches the preset temperature reduction amplitude, and then keep the opening degree of the subcooling valve of the indoor unit to be adjusted unchanged.

5. The method according to any one of claims 1 to 3, characterized in that, The adjusting the opening degree of the subcooling valve based on the exhaust temperature difference between the preset exhaust temperature and the actual exhaust temperature until the preset stop conditions are met includes: When the exhaust temperature difference of the indoor unit to be adjusted is greater than the third temperature difference threshold, gradually reduce the opening degree of the subcooling valve of the indoor unit to be adjusted until the exhaust temperature difference of the indoor unit to be adjusted is equal to the fourth temperature difference threshold, and then keep the opening degree of the subcooling valve of the indoor unit to be adjusted unchanged.

6. The method according to any one of claims 1 to 3, characterized in that The adjusting the opening degree of the subcooling valve based on the exhaust temperature difference between the preset exhaust temperature and the actual exhaust temperature until the preset stop conditions are met includes: When the exhaust temperature difference of the indoor unit to be adjusted is less than or equal to the third temperature difference threshold, keep the opening degree of the subcooling valve of the indoor unit to be adjusted unchanged.

7. A refrigeration control device for a multi-connected air conditioner, characterized in that, Applied to a multi-connected air conditioner, the multi-connected air conditioner includes a plurality of indoor units, and the device includes: An acquisition module, configured to acquire the average liquid pipe temperature of each of the multiple indoor units after the multi-connected air conditioner is in the cooling mode and operates for a preset operation duration; the average liquid pipe temperature is: the average temperature of the liquid pipe of the indoor unit within the preset operation duration; A calculation module, configured to calculate the liquid pipe temperature difference between the average liquid pipe temperature of each indoor unit and the standard liquid pipe temperature; A determination module, configured to determine the indoor unit with a liquid pipe temperature difference exceeding a first temperature difference threshold as the indoor unit to be adjusted; A control module, configured to perform operation control on the indoor units to be adjusted in sequence according to the operation sequence in the operation combination until the indoor units to be adjusted meet the preset stop condition; Wherein, the operation combination includes: adjusting the target superheat degree based on the liquid pipe temperature difference, and adjusting the opening degree of the sub-cooling valve based on the exhaust temperature difference between the preset exhaust temperature and the actual exhaust temperature.

8. The device according to claim 7, wherein, The control module is specifically configured to gradually reduce the target superheat degree of the indoor unit to be adjusted until the liquid pipe temperature difference of the indoor unit to be adjusted is less than a second temperature difference threshold when the liquid pipe temperature difference of the indoor unit to be adjusted is greater than the first temperature difference threshold; Wherein, the second temperature difference threshold is less than the first temperature difference threshold.

9. An air conditioner, characterized in that, It includes a memory, a processor, and a computer program stored on the memory and executable on the processor, and when the processor executes the program, it implements the steps of the cooling control method of the multi-connected air conditioner according to any one of claims 1 to 6.

10. A computer-readable storage medium, characterized in that, A computer program is stored thereon, and when the computer program is executed by the processor, it implements the steps of the cooling control method of the multi-connected air conditioner according to any one of claims 1 to 6.

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