Multi-connected system, control method, device and medium thereof

Abstract

The application provides a multi-connected system, a control method, equipment and a medium thereof. If at least one indoor unit in the multi-connected system is detected to be in a shutdown state, the adjustment capacity of each indoor unit in the shutdown state is obtained. According to the adjustment capacity of each indoor unit in the shutdown state under the current environmental adjustment mode of the multi-connected system, the operation frequency of the compressor is adjusted to a target frequency, and at least an upstream control valve connected to the indoor unit in the shutdown state is closed. The common control of the compressor frequency and the control valve is realized, the compressor frequency is reduced, the refrigerant in the indoor unit in the shutdown state is prevented from participating in heat exchange, and the energy consumption of the multi-connected system is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioning, and specifically provides a multi-connected system, a control method, equipment and a medium thereof. BACKGROUND

[0002] In a multi-connected system such as a multi-split air conditioner commonly seen in the market, when one or more indoor units are turned on, the non-operating indoor units also have refrigerant flowing therethrough to participate in heat exchange of the heat exchanger of the indoor unit, resulting in unnecessary energy loss.

[0003] Therefore, how to reduce the energy loss of the multi-connected system is a technical problem to be solved by those skilled in the art. SUMMARY

[0004] In order to overcome the above-mentioned defects, the present application is proposed to provide a control method, device, equipment, system and medium of a multi-connected system to solve or at least partially solve the technical problem of large energy loss of the multi-connected system.

[0005] In a first aspect, the present application provides a control method of a multi-connected system, which comprises:

[0006] If it is detected that at least one indoor unit in the multi-connected system is in a shutdown state, the adjustment capacity of each indoor unit in the shutdown state is obtained;

[0007] According to the adjustment capacity of each indoor unit in the shutdown state under the current environmental regulation mode of the multi-connected system, the operating frequency of the compressor is adjusted to a target frequency, and at least an upstream control valve connected to the indoor unit in the shutdown state is closed; wherein the upstream control valve is a control valve connected to the indoor unit in the shutdown state through which the refrigerant first flows under the current environmental regulation mode of the multi-connected system.

[0008] Further, in the control method of the multi-connected system, according to the adjustment capacity of each indoor unit in the shutdown state under the current environmental regulation mode of the multi-connected system, the operating frequency of the compressor is adjusted to a target frequency, which comprises:

[0009] The adjustment capacity of each indoor unit in the shutdown state is input into the following calculation formula to obtain the target frequency of the compressor;

[0010] Wherein, the calculation formula is as follows:

[0011] F1=(P n -P x1 -P x2 -......P xi )*F

[0012] P n

[0013] Wherein, F1 represents the target frequency, P n represents the total adjustment capacity of all indoor units in the current environment adjustment mode of the multi-split system, P xi represents the adjustment capacity of the i-th stopped indoor unit, and F represents the frequency of the compressor when all indoor units are in the running state.

[0014] Further, the control method of the multi-split system described above further comprises:

[0015] If it is detected that the multi-split system enters the defrosting mode, all control valves connected to the indoor units are opened, and the running frequency of the compressor is adjusted to the defrosting frequency.

[0016] Further, in the control method of the multi-split system described above, at least the upstream control valve connected to the stopped indoor unit is closed, comprising:

[0017] only the upstream control valve connected to the stopped indoor unit is closed; or,

[0018] both the upstream control valve connected to the stopped indoor unit and the downstream control valve connected to the stopped indoor unit are closed;

[0019] Wherein, the downstream control valve is a control valve connected to the stopped indoor unit through which the refrigerant flows after the current environment adjustment mode of the multi-split system.

[0020] Further, the control method of the multi-split system described above further comprises:

[0021] acquiring the total refrigerant flow of the indoor units in the running state;

[0022] If the total refrigerant flow is less than a preset threshold, at least one stopped indoor unit is selected as a target indoor unit from all stopped indoor units, and the control valve connected to each target indoor unit is opened.

[0023] Further, in the control method of the multi-split system described above, at least one stopped indoor unit is selected as a target indoor unit from all stopped indoor units, comprising:

[0024] According to the order from late to early of the time of entering the stopped state, at least one stopped indoor unit is selected as the target indoor unit based on the time of entering the stopped state.

[0025] Further, the control method of the multi-split system described above further comprises:

[0026] If the total refrigerant flow is greater than or equal to the preset threshold, a fault prompt information that the control valve is not closed is output.

[0027] In a second aspect, the present application provides a control device of a multi-connected system, comprising a processor and a storage device, the storage device being adapted to store a plurality of program codes, the program codes being adapted to be loaded and run by the processor to perform the control method of the multi-connected system according to any one of the above aspects.

[0028] In a third aspect, the present application provides a multi-connected system comprising the control device of the multi-connected system according to the above aspect.

[0029] In a fourth aspect, the present application provides a computer readable storage medium, in which a plurality of program codes are stored, the program codes being adapted to be loaded and run by a processor to perform the control method of the multi-connected system according to any one of the above aspects.

[0030] The above one or more technical solutions of the present application have at least one or more of the following beneficial effects:

[0031] In the implementation of the technical solutions of the present application, if it is detected that at least one indoor unit of the multi-connected system is in a stop state, the adjustment capacity of each indoor unit in the stop state is obtained; according to the adjustment capacity of each indoor unit in the stop state under the current environmental adjustment mode of the multi-connected system, the operating frequency of the compressor is adjusted to a target frequency, and at least the upstream control valve connected to the indoor unit in the stop state is closed, thereby realizing the common control of the compressor frequency and the control valve, reducing the compressor frequency, preventing the refrigerant in the indoor unit in the stop state from participating in heat exchange, and reducing the energy consumption of the multi-connected system. BRIEF DESCRIPTION OF DRAWINGS

[0032] The disclosure of the present application will become more apparent with reference to the drawings. It is easily understood by those skilled in the art that these drawings are only for illustrative purposes, and are not intended to limit the scope of protection of the present application. In addition, similar numbers in the figures are used to represent similar components, wherein:

[0033] Figure 1 is a main step flow diagram of the control method of the multi-connected system according to an embodiment of the present application;

[0034] Figure 2 is a main step flow diagram of the control method of the multi-connected system according to another embodiment of the present application;

[0035] Figure 3 is a main structure block diagram of the control device of the multi-connected system according to an embodiment of the present application. DETAILED DESCRIPTION

[0036] Some embodiments of the present application will be described in detail with reference to the drawings. It should be understood that the embodiments are only used to explain the technical principles of the present application, and are not intended to limit the scope of protection of the present application.

[0037] In the description of the present application, "module" and "processor" can include hardware, software or a combination of both. A module can include hardware circuitry, various suitable sensors, communication ports, memory, and can also include a software portion such as program code, and can be a combination of software and hardware. The processor can be a central processor, a microprocessor, a graphic processor, a digital signal processor or any other suitable processor. The processor has data and / or signal processing functions. The processor can be implemented in software, hardware or a combination of both. The non-transitory computer readable storage medium includes any suitable medium that can store program code, such as a magnetic disk, a hard disk, an optical disk, a flash memory, a read-only memory, a random access memory, etc. The term "A and / or B" means all possible combinations of A and B, such as only A, only B or both A and B. The term "at least one of A or B" or "at least one of A and B" has a similar meaning as "A and / or B", and can include only A, only B or both A and B. The singular form of the term "one", "this" can also include the plural form.

[0038] In the multi-split air conditioning system commonly seen in the market, when one or more indoor units are turned on, the non-operating indoor units also have refrigerant flowing through them, participating in the heat exchange of the heat exchanger of the indoor unit, resulting in unnecessary energy loss.

[0039] Therefore, in order to solve the above technical problems, the present application provides the following technical solutions:

[0040] Referring to the accompanying drawings Figure 1 , Figure 1 is a schematic diagram of the main steps of the control method of the multi-split air conditioning system according to an embodiment of the present application. As shown in Figure 1 , the control method of the multi-split air conditioning system in the embodiment of the present application mainly includes the following steps 101-102.

[0041] Step 101, if it is detected that at least one indoor unit in the multi-split air conditioning system is in a stopped state, the regulation capacity of each indoor unit in the stopped state is obtained;

[0042] In one specific implementation, the state of each indoor unit in the multi-split system can be detected in real time. If at least one indoor unit in the multi-split system is detected to be in a shutdown state, the adjustment capacity of each indoor unit in the shutdown state, such as heating capacity and cooling capacity, can be obtained in order to reduce the energy loss of the multi-split system. The adjustment capacity of each indoor unit in the shutdown state can be obtained according to the instruction manual of the multi-split system when it is shipped, or can be obtained by other means, and the present embodiment does not make specific limitations.

[0043] In step 102, the running frequency of the compressor is adjusted to a target frequency according to the adjustment capacity of each indoor unit in the shutdown state in the current environmental regulation mode of the multi-split system, and at least the upstream control valve connected to the indoor unit in the shutdown state is closed.

[0044] In one specific implementation, if the frequency of the compressor is still running at the running frequency before the indoor unit is shutdown, energy will be wasted. In addition, if the refrigerant still flows through the indoor unit in the shutdown state, it will exchange heat with the heat exchanger of the indoor unit, resulting in energy waste. Therefore, the running frequency of the compressor can be adjusted to a target frequency according to the adjustment capacity of each indoor unit in the shutdown state in the current environmental regulation mode of the multi-split system, and at least the upstream control valve connected to the indoor unit in the shutdown state is closed. The upstream control valve is the control valve connected to the indoor unit in the shutdown state through which the refrigerant flows first in the current environmental regulation mode of the multi-split system.

[0045] Specifically, the adjustment capacity of each indoor unit in the shutdown state can be input into the following calculation formula to obtain the target frequency of the compressor.

[0046] The calculation formula is as follows:

[0047] F1 = (P n - P x1 - P x2 -... P xi )* F

[0048] P n

[0049] Wherein, F1 represents the target frequency, P n represents the total adjustment capacity of all indoor units in the current environmental regulation mode of the multi-split system, P xi represents the adjustment capacity of the i-th indoor unit in the shutdown state, and F represents the frequency of the compressor when all indoor units are in the running state.

[0050] In one specific implementation, at least closing the upstream control valve connected to the indoor unit in the shutdown state includes:

[0051] Only the upstream control valve connected to the indoor unit in the shutdown state is closed, which can prevent the refrigerant from flowing into the indoor unit. Alternatively,

[0052] Simultaneously close the upstream control valve connected with the indoor unit in the stop state and the downstream control valve connected with the indoor unit in the stop state, so that the upstream and downstream control valves connected with the indoor unit in the stop state are simultaneously closed, and the purpose of reducing energy consumption can be better achieved. The downstream control valve is a control valve connected with the indoor unit in the stop state through which the refrigerant flows in the current environment adjustment mode of the multi-split system.

[0053] Specifically, when the multi-split system operates in the heating mode, the upstream control valve can be a solenoid valve, and the downstream control valve can be an expansion valve. When the multi-split system operates in the cooling mode or the dehumidification mode, the upstream control valve can be an expansion valve, and the downstream control valve can be a solenoid valve.

[0054] The control method of the multi-split system of the embodiment detects that at least one indoor unit in the multi-split system is in the stop state, and obtains the adjustment capacity of each indoor unit in the stop state. According to the adjustment capacity of each indoor unit in the stop state in the current environment adjustment mode of the multi-split system, the operating frequency of the compressor is adjusted to a target frequency, and at least the upstream control valve connected with the indoor unit in the stop state is closed, so that the frequency of the compressor and the control valve are jointly controlled, the frequency of the compressor is reduced, the refrigerant in the indoor unit in the stop state is prevented from participating in heat exchange, and the energy consumption of the multi-split system is reduced.

[0055] Referring to the accompanying Figure 2 , Figure 2 is a main step flowchart of the control method of the multi-split system according to another embodiment of the present application. As shown in Figure 2 , the control method of the multi-split system in the embodiment mainly includes the following steps 201-102.

[0056] Step 201, if it is detected that at least one indoor unit in the multi-split system is in the stop state, the adjustment capacity of each indoor unit in the stop state is obtained.

[0057] Step 202, according to the adjustment capacity of each indoor unit in the stop state in the current environment adjustment mode of the multi-split system, the operating frequency of the compressor is adjusted to a target frequency, and at least the upstream control valve connected with the indoor unit in the stop state is closed.

[0058] Step 203, the total flow of the refrigerant of the indoor unit in the running state is obtained.

[0059] In a specific implementation process, the total flow of the refrigerant of the indoor unit in the running state can be obtained in real time by a flow sensor arranged at the inlet of the compressor.

[0060] Step 204, it is detected whether the total flow of the refrigerant is less than a preset threshold value; if yes, step 205 is performed, and if no, step 206 is performed.

[0061] In one specific implementation, the predicted value of the refrigerant flow rate flowing through each indoor unit during operation can be obtained according to the adjustment capability of each indoor unit. In this way, a possible total refrigerant flow rate can be obtained as a preset threshold value according to the adjustment capability of the indoor unit in the operating state, and then the obtained total refrigerant flow rate is compared with the preset threshold value to detect whether the total refrigerant flow rate is less than the preset threshold value. If yes, step 205 is executed, and if no, step 206 is executed.

[0062] Step 205: Select at least one indoor unit in the stopped state as a target indoor unit from all indoor units in the stopped state, and open the control valve connected to each target indoor unit.

[0063] In one specific implementation, if the total refrigerant flow rate is less than the preset threshold value, a part of the indoor units may have insufficient refrigerant flowing in, and the adjustment capability is poor. In order to avoid frequent adjustment of the compressor, at least one indoor unit in the stopped state can be selected as a target indoor unit from all indoor units in the stopped state, and the control valve connected to each target indoor unit is opened, so that the refrigerant in a part of the indoor units in the stopped state supplements the total refrigerant flow rate.

[0064] It should be noted that although a certain amount of refrigerant flows in a part of the indoor units in the stopped state in this case, the frequency of the compressor is relatively low, the total energy consumption does not increase significantly, and the adjustment capability of the indoor unit in the operating state can be ensured. At the same time, frequent adjustment of the compressor can be avoided, and the service life of the compressor can be prolonged.

[0065] In one specific implementation, at least one indoor unit in the stopped state can be selected as the target indoor unit in the order of the time of entering the stopped state from late to early based on the time of entering the stopped state. In this way, the temperature difference between the refrigerant temperature in the indoor unit that enters the stopped state the latest and the required temperature can be small, and the energy consumption is relatively low when heat exchange is performed.

[0066] Step 206: Output the fault prompt information that the control valve is not closed.

[0067] In one specific implementation, if the total refrigerant flow rate is greater than or equal to the preset threshold value, it indicates that some control valves may not be closed due to faults. Therefore, the fault prompt information that the control valve is not closed can be output.

[0068] In one specific implementation, the control valve connected to the indoor unit in the stopped state can also be opened temporarily in a certain order in sequence, and the change amount of the total refrigerant flow rate is detected. If the change amount is greater than a preset change amount, it indicates that the control valve connected to the indoor unit in the stopped state does not have a fault when it is opened temporarily. On the contrary, if the change amount is less than or equal to the preset change amount, it indicates that the control valve connected to the indoor unit in the stopped state has a fault when it is opened temporarily, so that the fault point can be located.

[0069] In one implementation, if the multi-connected system is detected to enter the defrosting mode, all the control valves connected to the indoor units are controlled to be opened, and the running frequency of the compressor is adjusted to the defrosting frequency. When the defrosting mode is exited, the control valves of the indoor units in the stop state are closed.

[0070] In one implementation, the specific running process of the control method of the multi-connected system of the embodiment is as follows:

[0071] (1) In the heating mode, all the indoor units are opened, and all the electromagnetic valves are opened with the maximum opening degree.

[0072] (2) In the heating mode, some of the indoor units are not opened, and the expansion valves of the indoor units not opened are closed. The refrigerant of the indoor units not opened does not participate in the system circulation. At this time, the compressor reduces the frequency according to the number of the indoor units running, which is beneficial to energy consumption. All the indoor units in the heating mode are opened, and the frequency of the compressor is F. When one indoor unit is closed, the frequency of the compressor is F1=(Pn-Px1) / Pn×F, when two indoor units are closed, the frequency of the compressor is F2=(Pn-Px1-Px2) / Pn×F, and so on. The fewer the number of the indoor units in the heating mode, the lower the frequency of the compressor, and the lower the energy consumption.

[0073] (3) In the heating mode, defrosting is entered, all the electromagnetic valves are opened with the maximum opening degree, all the expansion valves are opened, the compressor enters the defrosting frequency, and all the indoor units participate in the defrosting. When the defrosting is exited, the electromagnetic valves of the indoor units not participating in the heating are closed.

[0074] (4) In the refrigeration mode, all the electromagnetic valves are opened.

[0075] In one implementation, in the refrigeration mode, the expansion valves of the indoor units not opened can be closed, and the electromagnetic valves can be kept opened.

[0076] (5) In the standby or power-off state, the electromagnetic valves are closed by default.

[0077] It should be noted that although the steps in the above embodiments are described in a specific order, those skilled in the art can understand that, in order to achieve the effect of the present application, the steps do not necessarily have to be executed in this order, and they can be executed simultaneously (in parallel) or in other orders, and these changes are within the protection scope of the present application.

[0078] Those skilled in the art can understand that all or part of the processes in the method of the above-mentioned embodiment of the present application can also be completed by a computer program instructing related hardware, and the computer program can be stored in a computer readable storage medium. When the computer program is executed by a processor, the steps of the above-mentioned various method embodiments can be implemented. The computer program includes computer program code, which can be in the form of source code, object code, executable file or some intermediate form, etc. The computer readable storage medium can include any entity or device, medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory, random access memory, electrical carrier signal, telecommunication signal and software distribution medium, etc. that can carry the computer program code. It should be noted that the contents included in the computer readable storage medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction, for example, in some jurisdictions, according to legislation and patent practice, the computer readable storage medium does not include electrical carrier signals and telecommunication signals.

[0079] Further, the present application also provides a control device of a multi-connected system.

[0080] Referring to the drawings Figure 3 , Figure 3 is the main structure block diagram of the control device of the multi-connected system according to an embodiment of the present application. As shown in Figure 3 , the control device of the multi-connected system in the embodiment of the present application can include a processor 31 and a storage device 32.

[0081] The storage device 32 can be configured to store the program of the control method of the multi-connected system for executing the above-mentioned method embodiments, and the processor 31 can be configured to execute the program in the storage device 32, which includes but is not limited to the program of the control method of the multi-connected system for executing the above-mentioned method embodiments. For the convenience of description, only the parts related to the embodiments of the present application are shown, and the specific technical details not disclosed are referred to the method part of the embodiments of the present application. The control device of the multi-connected system can be a control device formed by various electronic devices.

[0082] In one implementation, the number of the storage devices 32 and the processors 31 can be multiple. The program of the control method of the multi-split system according to the method embodiments can be divided into multiple sub-programs, each of which can be loaded and run by the processor 31 to perform different steps of the control method of the multi-split system according to the method embodiments. Specifically, each sub-program can be stored in a different storage device 32, and each processor 31 can be configured to execute the program in one or more storage devices 32 to jointly implement the control method of the multi-split system according to the method embodiments, i.e., each processor 31 performs different steps of the control method of the multi-split system according to the method embodiments to jointly implement the control method of the multi-split system according to the method embodiments.

[0083] The multiple processors 31 can be processors deployed on the same device, for example, the device can be a high-performance device composed of multiple processors, and the multiple processors 31 can be processors configured on the high-performance device. In addition, the multiple processors 31 can also be processors deployed on different devices, for example, the device can be a server cluster, and the multiple processors 31 can be processors on different servers in the server cluster.

[0084] Further, the present application also provides a computer readable storage medium. In one computer readable storage medium embodiment according to the present application, the computer readable storage medium can be configured to store the program of the control method of the smart home device according to the method embodiments, which can be loaded and run by the processor to implement the control method of the multi-split system. For ease of illustration, only the parts related to the embodiments of the present application are shown, and the specific technical details not disclosed are referred to the method part of the embodiments of the present application. The computer readable storage medium can be a storage device formed by various electronic devices, and optionally, the computer readable storage medium in the embodiments of the present application is a non-transitory computer readable storage medium.

[0085] Further, it should be understood that, since the setting of each module is only for illustrating the functional units of the device of the present application, the corresponding physical device of the module can be the processor itself, or a part of software, hardware, or a combination of software and hardware in the processor. Therefore, the number of each module in the figure is only illustrative.

[0086] Those skilled in the art can understand that each module in the device can be adaptively split or combined. Such splitting or combining of the specific module does not cause the technical solution to deviate from the principles of the present application, and therefore, the technical solution after splitting or combining will fall within the protection scope of the present application.

[0087] The technical scheme of the present application has been described in combination with the preferred embodiments shown in the drawings, but it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the related technical features without departing from the principles of the present application, and the technical schemes after the changes or replacements will all fall within the protection scope of the present application.

Claims

1. A control method of a multi VRF system, characterized by, The method comprises the following steps: If it is detected that at least one indoor unit in the multi-connected system is in a stop state, the adjustment capacity of each indoor unit in the stop state is obtained; According to the adjustment capacity of each indoor unit in the stop state in the current environment adjustment mode of the multi-connected system, the operating frequency of the compressor is adjusted to a target frequency, and at least an upstream control valve connected to the indoor unit in the stop state is closed; wherein the upstream control valve is a control valve connected to the indoor unit in the stop state through which refrigerant flows first in the current environment adjustment mode of the multi-connected system; The method further comprises the following steps: The total refrigerant flow of the indoor unit in the running state is obtained; If the total refrigerant flow is less than a preset threshold, at least one indoor unit in the stop state is selected as a target indoor unit from all the indoor units in the stop state, and a control valve connected to each target indoor unit is opened; Selecting at least one indoor unit in the stop state as a target indoor unit from all the indoor units in the stop state comprises: According to the time of entering the stop state, at least one indoor unit in the stop state is selected as the target indoor unit in the order of the time of entering the stop state from late to early.

2. The control method of a multi VRF system according to claim 1, wherein, According to the adjustment capacity of each indoor unit in the stop state in the current environment adjustment mode of the multi-connected system, adjusting the operating frequency of the compressor to a target frequency comprises: The adjustment capacity of each indoor unit in the stop state is input into the following calculation formula to obtain the target frequency of the compressor; The calculation formula is as follows: wherein F1 represents a target frequency, P n represents the total adjustment capacity of all indoor units in the current environment adjustment mode of the multi-connected system, P xi represents the adjustment capacity of the indoor unit in the i-th stop state, and F represents the frequency of the compressor when all indoor units are in the running state.

3. The control method of a multi VPS system according to claim 1, wherein The method further comprises the following steps: If it is detected that the multi-connected system enters a defrosting mode, all control valves connected to the indoor units are controlled to be fully opened, and the operating frequency of the compressor is adjusted to a defrosting frequency.

4. The control method of a multi VPS system according to claim 1, wherein At least closing the upstream control valve connected to the indoor unit in the stop state comprises: Only closing the upstream control valve connected to the indoor unit in the stop state; or, Closing the upstream control valve connected to the indoor unit in the stop state and the downstream control valve connected to the indoor unit in the stop state at the same time; The downstream control valve is a control valve connected to the indoor unit in the stop state through which refrigerant flows last in the current environment adjustment mode of the multi-connected system.

5. The control method of a multi VPS system according to claim 1, wherein The method further comprises the following steps: If the total refrigerant flow is greater than or equal to the preset threshold, a fault prompt information that the control valve is not closed is output.

6. A control device of a multi VRF system, characterized by, The control device comprises a processor and a storage device, the storage device is adapted to store a plurality of program codes, the program codes are adapted to be loaded and run by the processor to execute the control method of the multi-connected system according to any one of claims 1 to 5.

7. A multi-split system, characterized in that, The control device of the multi-connected system according to claim 6 is comprised.

8. A computer-readable storage medium, characterized in that, A plurality of program codes are stored therein, the program codes are adapted to be loaded and run by the processor to execute the control method of the multi-connected system according to any one of claims 1 to 5.

Images