Refrigerant circulation system, control method and device thereof, electronic equipment and storage medium

Abstract

The invention relates to a refrigerant circulation system and a control method and device thereof, electronic equipment and a storage medium, the system comprises a refrigerant circulation subsystem and a liquid storage module, the refrigerant circulation subsystem comprises a first pressure pipeline and a second pressure pipeline, and the pressure of the first pressure pipeline is larger than that of the second pressure pipeline; the liquid storage module is connected with the first pressure pipeline through a first pipeline, and a liquid inlet valve is mounted on the first pipeline; the liquid storage module is connected with the second pressure pipeline through a second pipeline, a gas balance valve is installed on the second pipeline, and the gas balance valve is used for adjusting the flow speed of a refrigerant in the liquid storage module; the liquid storage module is connected with the second pressure pipeline through a third pipeline, and a liquid discharge valve is installed on the third pipeline. Therefore, the refrigerant amount in the refrigerant circulation system can be adjusted more accurately, and the energy efficiency of the refrigerant circulation system is improved.

Description

Technical Field

[0001] The present application relates to the field of air conditioning technology, and in particular to a refrigerant circulation system and a control method, device, electronic equipment and storage medium thereof. Background Art

[0002] At present, for multi-split systems, changes in outdoor temperature, the number of indoor units turned on, and different load rates will have a significant impact on the amount of refrigerant required by the system. Therefore, during the operation of the multi-split system, the amount of refrigerant is often inappropriate. When the amount of refrigerant in the system is inappropriate, the system energy efficiency cannot reach the best. Therefore, it is very important to adjust the amount of refrigerant during the operation of the multi-split system.

[0003] In the prior art, when it is determined that the amount of refrigerant in a multi-split system needs to be adjusted, the amount of refrigerant in the multi-split system is generally increased or decreased by opening or closing a liquid storage tank. However, in this process, the amount of refrigerant flowing in and out cannot be accurately controlled, which not only makes it impossible to accurately adjust the amount of refrigerant in the multi-split system, but also easily produces the opposite effect. Summary of the invention

[0004] The present application provides a refrigerant circulation system and its control method, device, electronic device and storage medium to solve the technical problem in the prior art that when the refrigerant amount of a multi-split system is adjusted through a liquid storage tank, the amount of refrigerant flowing into and out of the liquid storage tank cannot be accurately controlled, resulting in not only the inability to accurately adjust the refrigerant amount in the multi-split system, but also the possibility of having the opposite effect.

[0005] In a first aspect, the present application provides a refrigerant circulation system, comprising: a refrigerant circulation subsystem and a liquid storage module, the refrigerant circulation subsystem comprising a first pressure pipeline and a second pressure pipeline, the pressure of the first pressure pipeline being greater than the pressure of the second pressure pipeline;

[0006] The liquid storage module is connected to the first pressure pipeline through a first pipeline, and a liquid inlet valve is installed on the first pipeline; the refrigerant in the refrigerant circulation subsystem flows into the liquid storage module through the first pipeline;

[0007] The liquid storage module is connected to the second pressure pipeline through a second pipeline, and a gas balance valve is installed on the second pipeline. The gaseous refrigerant in the liquid storage module flows into the refrigerant circulation subsystem through the second pipeline; the gas balance valve is used to adjust the flow rate of the refrigerant in the liquid storage module;

[0008] The liquid storage module is connected to the second pressure pipeline via a third pipeline, and a drain valve is installed on the third pipeline; the liquid refrigerant in the liquid storage module flows into the refrigerant circulation subsystem via the third pipeline.

[0009] As an optional implementation, the liquid storage module is connected to the first pipeline via a first end at the top;

[0010] The liquid storage module is connected to the second pipeline via the second end at the top;

[0011] The liquid storage module is connected to the third pipeline via a third end at the bottom.

[0012] As an optional implementation, the refrigerant circulation system further includes a fourth pipeline;

[0013] The first end of the fourth pipeline is connected to the first end of the top of the liquid storage module;

[0014] The second end of the fourth pipeline is connected to the second pressure pipeline;

[0015] The fourth pipeline is equipped with an unloading valve.

[0016] In a second aspect, the present application provides a control method for a refrigerant circulation system, which is applied to the refrigerant circulation system described in any one of the first aspects, and the method includes:

[0017] Acquire a set of parameters involved in the operation of a refrigerant circulation subsystem in the refrigerant circulation system;

[0018] Determine the current energy efficiency and current power of the refrigerant circulation subsystem according to the parameter set, and predict the target energy efficiency and target power to be achieved;

[0019] Determining an operation mode of a liquid storage module according to the current energy efficiency, the target energy efficiency, the current power, and the target power;

[0020] According to the operation mode, the switch states of the liquid inlet valve, the gas balance valve, and the liquid discharge valve connected to the liquid storage module are adjusted.

[0021] As an optional implementation, the refrigerant circulation subsystem includes at least one indoor module and at least one outdoor module, the indoor module is used to cool or heat the room, and the obtaining of a set of parameters involved in the operation of the refrigerant circulation subsystem in the refrigerant circulation system includes:

[0022] Obtaining a system operation mode of the refrigerant circulation subsystem;

[0023] Obtaining a set temperature value of at least one of the indoor modules, and obtaining an indoor temperature value through a temperature sensor installed in the indoor module;

[0024] Obtaining an outdoor temperature value through a temperature sensor installed in the outdoor module;

[0025] Determining the total output energy of the indoor module;

[0026] Acquire a first power of the indoor module and a second power of the outdoor module;

[0027] The system operation mode, at least one of the set temperature values, at least one of the indoor temperature values, at least one of the outdoor temperature values, the total output energy, the first power, and the second power are classified into the parameter set.

[0028] As an optional implementation, determining the current energy efficiency and current power of the refrigerant circulation subsystem according to the parameter set, and predicting the target energy efficiency and target power to be achieved, includes:

[0029] Inputting the system operation mode, at least one of the set temperature values, at least one of the indoor temperature values, and at least one of the outdoor temperature values ​​into a preset performance test model to obtain the target energy efficiency and target power output by the performance test model;

[0030] Adding the first power and the second power to obtain the current power;

[0031] The total output energy is divided by the current power to obtain the current energy efficiency.

[0032] As an optional implementation, determining the operation mode of the liquid storage module according to the current energy efficiency, the target energy efficiency, the current power, and the target power includes:

[0033] When it is determined that the current energy efficiency is less than the target energy efficiency, comparing the current power with the target power to obtain a comparison result;

[0034] When the comparison result indicates that the current power is less than the target power, determining that the initial operation mode of the liquid storage module is a refrigerant exhaust mode;

[0035] When the comparison result indicates that the current power is greater than or equal to the target power, determining that the initial operation mode of the liquid storage module is a refrigerant storage mode;

[0036] Determining a comparative power interval corresponding to the initial operation mode;

[0037] The operation mode of the liquid storage module is determined according to the current power and the comparison power interval.

[0038] As an optional implementation manner, determining the comparison power interval corresponding to the initial operation mode includes:

[0039] When the initial operation mode is a refrigerant discharge mode, the comparison power interval corresponding to the initial operation mode includes a first liquid discharge power interval and a second liquid discharge power interval; the power of the first liquid discharge power interval is less than the power of the second liquid discharge power interval, and the power of the second liquid discharge power interval is less than the target power;

[0040] The step of determining the operation mode of the liquid storage module according to the current power and the comparison power interval includes:

[0041] When it is determined that the current power belongs to the first liquid discharge power interval, determining that the operation mode of the liquid storage module is a rapid refrigerant discharge mode;

[0042] When it is determined that the current power belongs to the second liquid discharge power interval, the operation mode of the liquid storage module is determined to be a flexible refrigerant discharge mode.

[0043] As an optional implementation, adjusting the switch states of the liquid inlet valve, the gas balance valve, and the liquid discharge valve connected to the liquid storage module according to the operation mode includes:

[0044] When the operation mode of the liquid storage module is the rapid refrigerant discharge mode, the liquid inlet valve connected to the liquid storage module is controlled to be closed, the gas balance valve is opened, and the liquid discharge valve is opened;

[0045] When the operation mode of the liquid storage module is the flexible refrigerant discharge mode, the liquid inlet valve connected to the liquid storage module is controlled to be closed, the gas balance valve is controlled to be closed, and the liquid discharge valve is controlled to be opened.

[0046] As an optional implementation manner, determining the comparison power interval corresponding to the initial operation mode includes:

[0047] When the initial operation mode is a refrigerant storage mode, the comparison power interval corresponding to the initial operation mode includes a first liquid storage power interval and a second liquid storage power interval; the power of the first liquid storage power interval is less than the power of the second liquid storage power interval, and the power of the first liquid storage power interval is greater than the target power;

[0048] The step of determining the operation mode of the liquid storage module according to the current power and the comparison power interval includes:

[0049] When it is determined that the current power belongs to the first liquid storage power interval, determining that the operation mode of the liquid storage module is a flexible refrigerant storage mode;

[0050] When it is determined that the current power belongs to the second liquid storage power interval, the operation mode of the liquid storage module is determined to be a rapid refrigerant storage mode.

[0051] As an optional implementation, adjusting the switch states of the liquid inlet valve, the gas balance valve, and the liquid discharge valve connected to the liquid storage module according to the operation mode includes:

[0052] When the operation mode of the liquid storage module is the flexible refrigerant storage mode, the liquid inlet valve connected to the liquid storage module is controlled to be opened, the gas balance valve is closed, and the liquid discharge valve is closed;

[0053] When the operation mode of the liquid storage module is the rapid refrigerant storage mode, the liquid inlet valve connected to the liquid storage module is controlled to be opened, the gas balance valve is controlled to be opened, and the liquid discharge valve is controlled to be closed.

[0054] As an optional implementation, each of the comparison power intervals includes multiple sub-power intervals, and each of the sub-power intervals corresponds to an operating time; wherein the operating time is positively correlated with the absolute value of the difference corresponding to the sub-power interval, and the absolute value of the difference is the absolute value of the difference between any power value in the sub-power interval and the target power;

[0055] After determining the operation mode of the liquid storage module according to the current power and the comparison power interval, the method further includes:

[0056] Determine a target sub-power interval to which the current power belongs;

[0057] Determine the operating time corresponding to the target sub-power interval as the target time;

[0058] After adjusting the switch states of the liquid inlet valve, the gas balance valve, and the liquid discharge valve connected to the liquid storage module according to the operation mode, the method further includes:

[0059] Maintain the liquid storage module to operate in the current operating state for the target time period.

[0060] In a third aspect, the present application provides a control device for a refrigerant circulation system, which is applied to the refrigerant circulation system described in any one of the second aspects, and the device comprises:

[0061] An acquisition module, used to acquire a set of parameters involved in the operation of a refrigerant circulation subsystem in the refrigerant circulation system;

[0062] A first determination module, configured to determine the current energy efficiency and current power of the refrigerant circulation subsystem according to the parameter set, and predict the target energy efficiency and target power to be achieved;

[0063] A second determination module, configured to determine an operation mode of the liquid storage module according to the current energy efficiency, the target energy efficiency, the current power, and the target power;

[0064] The regulating module is used to regulate the switch states of the liquid inlet valve, the gas balance valve, and the liquid discharge valve connected to the liquid storage module according to the operating mode.

[0065] In a third aspect, the present application provides an electronic device comprising: a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other via the communication bus; the memory is used to store a computer program; and the processor is used to implement the control method of the refrigerant circulation system described in any one of the second aspects when executing the computer program.

[0066] In a fourth aspect, the present application provides a storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the control method of the refrigerant circulation system described in any one of the second aspects is implemented.

[0067] The above technical solution provided by the embodiment of the present application has the following advantages over the prior art: the refrigerant circulation system provided by the embodiment of the present application, by connecting the pipeline for the inflow of refrigerant in the liquid storage module to the pipeline with higher pressure in the refrigerant circulation subsystem of the refrigerant amount to be adjusted, and controlling it through the liquid inlet valve, connecting the pipeline for the outflow of refrigerant in the liquid storage module to the pipeline with lower pressure in the refrigerant circulation subsystem, and controlling it through the liquid discharge valve, can ensure the smooth inflow and outflow of the refrigerant. At the same time, another pipeline is set in the liquid storage module to connect the pipeline with lower pressure in the refrigerant circulation subsystem, and a gas balance valve is set. By adjusting the gas balance valve, the amount of gaseous refrigerant in the liquid storage module can be changed, the pressure in the liquid storage module can be adjusted, and thus the flow rate of the refrigerant in the liquid storage module can be adjusted. Based on the above structure of the liquid storage module, the inflow and outflow of the refrigerant in the liquid storage module can be accurately controlled by controlling different combinations of the liquid inlet valve, the liquid discharge valve, and the gas balance valve, thereby achieving more accurate adjustment of the refrigerant amount in the refrigerant circulation system and improving the energy efficiency of the refrigerant circulation system. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0069] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0070] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0071] Figure 1 A schematic diagram of the structure of a refrigerant circulation system provided in an embodiment of the present application;

[0072] Figure 2 A schematic diagram of the structure of another refrigerant circulation system provided in an embodiment of the present application;

[0073] Figure 3 A schematic diagram of the structure of another refrigerant circulation system provided in an embodiment of the present application;

[0074] Figure 4 A schematic diagram of the structure of several working modes of the liquid storage tank provided in the embodiment of the present application;

[0075] Figure 5 A schematic diagram of a refrigeration flow path in a refrigerant circulation system provided in an embodiment of the present application;

[0076] Figure 6 A schematic diagram of a heating flow path in a refrigerant circulation system provided in an embodiment of the present application;

[0077] Figure 7 A flow chart of an embodiment of a control method for a refrigerant circulation system provided in an embodiment of the present application;

[0078] Figure 8 A flow chart of another embodiment of a control method for a refrigerant circulation system provided in an embodiment of the present application;

[0079] Fig. 9 A flow chart of another embodiment of a control method for a refrigerant circulation system provided in an embodiment of the present application;

[0080] Fig.10 A flow chart of an embodiment of a control method for a refrigerant circulation system provided in an embodiment of the present application;

[0081] Fig.11 A flow chart of an embodiment of a control method for a refrigerant circulation system provided in an embodiment of the present application;

[0082] Fig.12 A block diagram of an embodiment of a control device for a refrigerant circulation system provided in an embodiment of the present application;

[0083] Fig.13 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0084] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0085] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0086] In order to solve the technical problem in the prior art that when the refrigerant amount of a multi-split system is adjusted through a liquid storage tank, the amount of refrigerant flowing into and out of the liquid storage tank cannot be accurately controlled, resulting in not only the inability to accurately adjust the refrigerant amount in the multi-split system, but also the possibility of having the opposite effect, the present application provides a refrigerant circulation system, which can connect the pipeline for the inflow of refrigerant in the liquid storage module to the pipeline with higher pressure in the refrigerant circulation subsystem of the refrigerant amount to be adjusted, and control it through the liquid inlet valve, and connect the pipeline for the outflow of refrigerant in the liquid storage module to the pipeline with lower pressure in the refrigerant circulation subsystem, and control it through the drain valve, so as to ensure The refrigerant flows in and out smoothly. At the same time, another pipeline is set in the liquid storage module to connect the pipeline with lower pressure in the refrigerant circulation subsystem, and a gas balance valve is set. By adjusting the gas balance valve, the amount of gaseous refrigerant in the liquid storage module can be changed, and the pressure in the liquid storage module can be adjusted, thereby adjusting the flow rate of the refrigerant in the liquid storage module. Based on the above structure of the liquid storage module, the inflow and outflow of the refrigerant in the liquid storage module can be accurately controlled by controlling different combinations of the liquid inlet valve, the liquid discharge valve, and the gas balance valve, thereby achieving more accurate adjustment of the refrigerant amount in the refrigerant circulation system and improving the energy efficiency of the refrigerant circulation system.

[0087] The refrigerant circulation system provided in the present application is further explained below with reference to specific embodiments in conjunction with the accompanying drawings, and the embodiments do not constitute a limitation on the embodiments of the present application.

[0088] See also Figure 1 , is a schematic diagram of the structure of a refrigerant circulation system provided in an embodiment of the present application. Figure 1 As shown, the refrigerant circulation system 10 may include: a refrigerant circulation subsystem 11 and a liquid storage module 12 .

[0089] The refrigerant circulation subsystem 11 may include a first pressure pipeline 111 and a second pressure pipeline 112. The refrigerant circulation subsystem 11 may be an air conditioning system, and further, it may be a multi-split air conditioning system. The refrigerant circulation subsystem 11 may be used to adjust the indoor temperature, and to cool or heat the room.

[0090] The liquid storage module 12 is used to store the refrigerant in the refrigerant circulation system. The refrigerant refers to the medium used for refrigeration, which can be Freon or other refrigerants, and the embodiment of the present application does not limit this. The liquid storage module 12 can be a liquid storage tank or other liquid storage container, and the embodiment of the present application does not limit this.

[0091] The liquid storage module 12 may be connected to the first pressure pipeline 111 through a first pipeline 121, and a liquid inlet valve 13 may be installed on the first pipeline 121. The refrigerant in the refrigerant circulation subsystem 11 may flow into the liquid storage module 12 through the first pipeline 121. The liquid inlet valve 13 may be used to adjust the amount of refrigerant passing through the first pipeline 121, and the embodiment of the present application does not limit the type and size of the liquid inlet valve 13.

[0092] The liquid storage module 12 can be connected to the second pressure pipeline 112 through the second pipeline 122. The second pipeline 122 is installed with a gas balance valve 14. The gaseous refrigerant in the liquid storage module can flow into the refrigerant circulation subsystem 11 through the second pipeline 122. The gas balance valve 14 can be used to adjust the flow rate of the refrigerant in the liquid storage module 12.

[0093] The liquid storage module 12 can be connected to the second pressure pipeline 112 via a third pipeline 123, and a drain valve 15 is installed on the third pipeline. The liquid refrigerant in the liquid storage module 12 can flow into the refrigerant circulation subsystem 11 via the third pipeline.

[0094] In one embodiment, based on Figure 1 The refrigerant circulation system 10 shown in the figure can determine the required amount of refrigerant in the refrigerant circulation subsystem 11 when controlling the amount of refrigerant in the refrigerant circulation subsystem 11, and control the liquid inlet valve 13, the gas balance valve 14, and the drain valve 15 in the liquid storage module 12 to control the liquid storage module 12 to provide the required amount of refrigerant for the refrigerant circulation subsystem 11. Since the liquid inlet valve 13 is connected to the first pressure pipeline 111 with higher pressure in the refrigerant circulation subsystem 11, and the drain valve 15 is connected to the second pressure pipeline 112 with lower pressure in the refrigerant circulation subsystem 11, a pressure difference is formed between the liquid inlet valve 13 and the drain valve 15, so that the refrigerant can flow into and out of the liquid storage module 12 smoothly.

[0095] Furthermore, since there is a gas balance valve 14 in the liquid storage module 12, the gas balance valve 14 can adjust the pressure inside the liquid storage module 12, thereby adjusting the flow rate of the refrigerant flowing into and out of the liquid storage module 12. Therefore, the amount of refrigerant in the refrigerant circulation subsystem 11 can be more accurately controlled through the liquid storage module 12.

[0096] The refrigerant circulation system provided in the embodiment of the present application connects the pipeline for the inflow of refrigerant in the liquid storage module to the pipeline with higher pressure in the refrigerant circulation subsystem of the refrigerant amount to be adjusted, and controls it through the liquid inlet valve; connects the pipeline for the outflow of refrigerant in the liquid storage module to the pipeline with lower pressure in the refrigerant circulation subsystem, and controls it through the liquid discharge valve. In this way, the smooth inflow and outflow of the refrigerant can be ensured. At the same time, another pipeline is set in the liquid storage module to connect the pipeline with lower pressure in the refrigerant circulation subsystem, and a gas balance valve is set. By adjusting the gas balance valve, the amount of gaseous refrigerant in the liquid storage module can be changed, and the pressure in the liquid storage module can be adjusted, thereby adjusting the flow rate of the refrigerant in the liquid storage module. Based on the above structure of the liquid storage module, the inflow and outflow of the refrigerant in the liquid storage module can be accurately controlled by controlling different combinations of the liquid inlet valve, the liquid discharge valve, and the gas balance valve, thereby achieving more accurate adjustment of the refrigerant amount in the refrigerant circulation system.

[0097] Further, see Figure 2 , is a schematic diagram of the structure of another refrigerant circulation system provided in an embodiment of the present application. Figure 2 As shown, the top of the liquid storage module 12 in the refrigerant circulation system 10 may include a first end P1 and a second end P2, and the bottom of the liquid storage module 12 may include a third end P3.

[0098] The liquid storage module 12 can be connected to the first pipeline 121 through the first end P1 at the top, the liquid storage module 12 can be connected to the second pipeline 122 through the second end P2 at the top, and the liquid storage module 12 can be connected to the third pipeline 123 through the third end P3 at the bottom.

[0099] Based on this connection method, the first pipeline 121 for the refrigerant to flow into the liquid storage module 12, and the second pipeline 122 for the gaseous refrigerant to flow out are both connected to the top of the liquid storage module 12, and the third pipeline 123 for discharging the refrigerant is connected to the bottom of the liquid storage module 12, which allows the refrigerant to flow in quickly from the top, the gaseous refrigerant to flow out quickly from the top, and the liquid refrigerant to flow out quickly at the bottom, thereby ensuring the timeliness of the refrigerant adjustment.

[0100] Furthermore, if Figure 2As shown, the refrigerant circulation system 10 may further include a fourth pipeline 21. The first end T1 of the fourth pipeline 21 may be connected to the first end P1 at the top of the liquid storage module 12, and the second end T2 of the fourth pipeline 21 may be connected to the second pressure pipeline 112. An unloading valve 22 may be installed on the fourth pipeline.

[0101] Based on this connection mode, when the pressure in the liquid storage module 12 exceeds the standard, the unloading valve 22 can be automatically opened to ensure the safety of the refrigerant circulation system 10 .

[0102] See also Figure 3 , which is a structural schematic diagram of another refrigerant circulation system provided in an embodiment of the present application. Figure 3 The system structure shown is described by taking the circulating refrigerant subsystem 11 as an air conditioning system and the liquid storage module 12 as a liquid storage tank as an example. Figure 3 As shown, the system may include the structure shown in Table 1:

[0103] Table 1

[0104] 101 compressor 201 First pipeline 301 Fluid storage tank 102 Four-way valve 202 Second pipeline 302 Liquid inlet valve 103 Outdoor heat exchanger 203 The third pipeline 303 Gas balance valve 104 Upper heating expansion valve 204 Fourth pipeline 304 Drain valve 105 Lower heating expansion valve 205 Liquid side main pipe 305 Unloading valve 106 Gas-liquid separator 206 Gas side main pipe

[0105] Among them, 301 liquid storage tank can be Figure 1 The liquid storage module 12, 302 liquid inlet valve shown can be Figure 1 The liquid inlet valve 13 and the gas balance valve 303 shown can be Figure 1 The gas balance valve 14, 304 drain valve shown can be Figure 1 The drain valve 15,305 shown in the figure can be a relief valve Figure 2 The unloading valve 22 shown in the figure, the above-mentioned 205 liquid side main pipe can be Figure 1 The first pressure pipeline shown, the third pipeline 203 can be Figure 1 The second pressure pipeline shown in the figure, the pipeline where the above-mentioned 302 liquid inlet valve is located can be Figure 1 The first pipeline 121 shown in the figure, the pipeline where the above-mentioned 303 gas balance valve is located can be Figure 1 The second pipeline 122 shown in the figure, the pipeline where the above-mentioned 304 drain valve is located can be Figure 1 The compressor 101, the four-way valve 102, the outdoor heat exchanger 103, the upper heating expansion valve 104, the lower heating expansion valve 105, and the gas-liquid separator 106 can constitute Figure 1 The refrigerant circulation subsystem 11 is shown.

[0106] based on Figure 3 In the system structure shown, the above-mentioned 301 liquid storage tank may include the following connection methods:

[0107] The 301 liquid storage tank is connected to the 205 liquid side main pipe through the 302 liquid inlet valve, and is connected to the 203 third pipeline through the 303 gas balance valve and the 304 liquid discharge valve. Since the 205 liquid side main pipe is at the medium pressure side regardless of cooling mode or heating mode, and the 203 third pipeline is always at the low pressure side, the liquid inlet side of the liquid storage tank has medium pressure, and the liquid discharge side has low pressure, and the two can always maintain a certain pressure difference to ensure sufficient liquid inlet and discharge power.

[0108] The pipelines related to the 302 inlet valve are connected to the top of the 301 liquid storage tank. When the 302 inlet valve is opened, the refrigerant enters from the top of the 301 liquid storage tank and encounters less resistance. After entering, the refrigerant is separated into gas and liquid layers, with the upper part being gaseous and the lower part being liquid.

[0109] The pipelines related to the 303 gas balance valve are also connected to the top of the 301 liquid storage tank. During the liquid filling process of the liquid storage tank, if the 303 gas balance valve is closed, the pressure of the liquid storage tank will gradually increase as the filling process proceeds, and the refrigerant will have difficulty entering the liquid storage tank. At this time, if the 303 gas balance valve is opened, the gaseous refrigerant on the top of the liquid storage tank will be connected to the low-pressure side, and the excess gaseous refrigerant will flow to the low-pressure side under the pressure difference, thereby reducing the pressure of the liquid storage tank and maintaining the liquid filling power. In addition, since the amount of liquid filling is always much larger than the outflow of the gaseous refrigerant through the 303 gas balance valve, it is still a net liquid filling state at this time.

[0110] The pipeline related to the 304 drain valve is connected to the bottom of the liquid storage tank. When the 304 drain valve is opened, the liquid refrigerant is discharged from the liquid storage tank under the action of the pressure difference between the liquid storage tank pressure and the low pressure.

[0111] The 305 unloading valve related pipeline is connected to the top of the liquid storage tank and will open automatically only when the pressure exceeds the standard to ensure system safety.

[0112] Based on the above connection mode, according to the combination of the liquid inlet valve, gas balance valve, and liquid discharge valve in the 301 liquid storage tank, the working mode of the 301 liquid storage tank can be divided into Figure 4 How it works: See Figure 4 , which is a schematic diagram of the structure of several working modes of the liquid storage tank provided in the embodiment of the present application. Figure 4 As shown, the liquid storage tank can have the following working modes:

[0113] See also Figure 4 A is a schematic diagram of the working mode of a liquid storage tank provided in an embodiment of the present application. Figure 4 The method shown in A is a fast refrigerant discharge method. In this method, the 303 gas balance valve and the 304 drain valve are opened at the same time, and the upper gaseous refrigerant in the liquid storage tank is discharged through the 303 gas balance valve, and the lower liquid refrigerant in the liquid storage tank is discharged through the 304 drain valve. Since the gaseous and liquid refrigerants are discharged to the outside at the same time, it is suitable for occasions where the refrigerant needs to be discharged quickly.

[0114] See also Figure 4 B is a schematic diagram of another working mode of a liquid storage tank provided in an embodiment of the present application. Figure 4 The method shown in B may be a flexible refrigerant discharge method, in which only the drain valve 304 is opened, and the lower layer of liquid refrigerant is discharged through the drain valve 304. Since only liquid refrigerant can be discharged, it is suitable for occasions where the discharge volume needs to be finely controlled or the discharge volume demand is small.

[0115] See also Figure 4 C is a schematic diagram of the structure of another working mode of a liquid storage tank provided in an embodiment of the present application. Figure 4 The method shown in C is a flexible refrigerant storage method. In this method, only the 302 liquid inlet valve is opened. The liquid refrigerant enters from the medium pressure side. Since the pressure will increase rapidly after the refrigerant is stored in the liquid storage tank, the power of the refrigerant inlet will decrease rapidly. Therefore, the overall refrigerant inlet rate is low, which is suitable for occasions where the liquid inlet amount needs to be finely controlled or the liquid inlet amount demand is small.

[0116] See also Figure 4 D is a schematic diagram of the structure of another working mode of a liquid storage tank provided in an embodiment of the present application. Figure 4 The method shown in C can be a fast refrigerant storage method. In this method, the liquid inlet valve 302 and the gas balance valve 303 can be opened at the same time. While the refrigerant is introduced, the pressure balance inside the liquid storage tank is maintained, so the refrigerant storage rate can be maintained. It is suitable for occasions that require fast refrigerant storage.

[0117] In one embodiment, Figure 3 The refrigerant flow direction in the refrigerant circulation system shown may include a cooling flow direction and a heating flow direction. The cooling flow direction and the heating flow direction of the refrigerant in the refrigerant circulation system may be respectively Figure 5 and Figure 6 The process shown is represented by:

[0118] See also Figure 5 , is a schematic diagram of a refrigeration flow path in a refrigerant circulation system provided in an embodiment of the present application. Figure 5 As shown, in the refrigeration cycle system, when the refrigeration is in operation, the flow direction of the refrigerant is as follows: the refrigerant discharged from the compressor 101 enters the second pipeline 202 through the four-way valve 102, condenses in the outdoor heat exchanger 103, and enters the indoor side through the liquid side main pipe 205 for evaporative refrigeration. The refrigerated refrigerant returns to the outdoor side through the gas side main pipe 206, and returns to the gas-liquid separator 106 and the compressor 101 through the four-way valve 102.

[0119] See also Figure 6 , is a schematic diagram of a heating flow path in a refrigerant circulation system provided in an embodiment of the present application. Figure 6As shown, in the heating operation of the refrigeration cycle system, the flow direction of the refrigerant is as follows: the refrigerant discharged from the compressor 101 enters the indoor side through the four-way valve 102 and the gas side main pipe 206 for condensation and heating. The refrigerant after heating returns to the outdoor side through the liquid side main pipe 205, evaporates in the outdoor heat exchanger 103, and returns to the gas-liquid separator 106 and the compressor 101 through the four-way valve 102.

[0120] based on Figure 5 and Figure 6 It can be seen from the refrigerant flow path shown that, whether in the cooling flow path or the heating flow path, the liquid inlet side of the 301 liquid storage tank (302 liquid inlet valve and its pipeline) is connected to the 205 liquid side main pipe, and is always at medium pressure. The gas balance side (303 gas balance valve and its pipeline) and the liquid discharge side (304 liquid discharge valve and its pipeline) of the 301 liquid storage tank are connected to the 203 third pipeline, and are always at the low pressure side.

[0121] The refrigerant circulation system provided in the embodiment of the present application is connected to the medium-pressure and low-pressure sides of the system pipeline through the liquid inlet valve, the liquid outlet valve and the gas balance valve to ensure sufficient inlet and outlet refrigerant pressure difference. By combining the above-mentioned valve switches and coordinating the valve switch duration, the refrigerant quantity adjustment speed is changed to meet the needs of various refrigerant adjustments.

[0122] Based on the refrigerant circulation system shown in the above figure, the present application provides a control method for a refrigerant circulation system, which can determine the current energy efficiency and current power of the refrigerant circulation subsystem, and predict the target energy efficiency and target power to be achieved by obtaining various parameters involved in the operation of the refrigerant circulation subsystem, thereby determining the operation mode of the liquid storage module, and controlling the switching states of the liquid inlet valve, gas balance valve, and liquid drain valve connected to the energy storage module according to the corresponding operation mode, so that the energy efficiency of the refrigerant circulation subsystem can reach the optimal energy efficiency, and realize more accurate adjustment of the refrigerant amount of the refrigerant circulation system, thereby improving the energy efficiency of the refrigerant circulation system.

[0123] See also Figure 7 , is a flow chart of an embodiment of a control method for a refrigerant circulation system provided in an embodiment of the present application. As an embodiment, Figure 7 The process shown can be applied to Figures 1 to 6 Any of the refrigerant circulation systems shown. Figure 7 As shown, the process may include the following steps:

[0124] Step 701: Obtain a set of parameters involved in the operation of a refrigerant circulation subsystem in a refrigerant circulation system.

[0125] The above-mentioned refrigerant circulation system can be a system that realizes cooling or heating functions by circulating refrigerant, for example Figure 1In the refrigerant circulation system 10 shown, the refrigerant refers to a refrigerant used for refrigeration, such as Freon, carbon dioxide, etc., which is not limited in the embodiment of the present application.

[0126] Furthermore, the refrigerant circulation system may include a refrigerant circulation subsystem and a liquid storage module, for example Figure 1 The refrigerant circulation subsystem 11 and the liquid storage module 12 are shown. The refrigerant circulation subsystem can further realize indoor cooling or heating functions.

[0127] In the embodiment of the present application, the execution subject of the embodiment of the present application may be a controller in the refrigerant circulation system, or a control system connected to the refrigerant circulation system, and the embodiment of the present application does not limit this.

[0128] In one embodiment, in order to improve the energy efficiency of the refrigerant circulation subsystem, the execution subject of the embodiment of the present application may obtain a set of parameters involved in the operation of the refrigerant circulation subsystem in the refrigerant circulation system. The above parameter set may include a variety of different parameters, which may include but are not limited to: the operation mode of the refrigerant circulation subsystem, the set temperature value for cooling or heating the indoor room, the current indoor temperature value, the outdoor temperature value, the total output energy of the indoor module, the first power of the indoor module, and the second power of the outdoor module. The indoor module refers to a module in the refrigerant circulation subsystem for adjusting the indoor temperature, such as an air conditioner indoor unit, and the outdoor module refers to a module installed in the outdoor part of the refrigerant circulation subsystem, such as an air conditioner outdoor unit.

[0129] As an optional implementation method, the execution subject of the embodiment of the present application can obtain in real time a set of parameters involved in the operation of the above-mentioned refrigerant circulation subsystem.

[0130] As another optional implementation method, the execution subject of the embodiment of the present application may periodically obtain a set of parameters involved in the operation of the above-mentioned refrigerant circulation subsystem.

[0131] As for how to obtain the above parameter set, you can refer to the following Figure 8 The process shown is explained and will not be described in detail here.

[0132] Step 702: Determine the current energy efficiency and current power of the refrigerant circulation subsystem according to the parameter set, and predict the target energy efficiency and target power to be achieved.

[0133] The above current energy efficiency refers to the proportional relationship between the energy consumed by the refrigerant circulation subsystem during the current operation and the cooling or heating effect it provides. An air conditioning system with high energy efficiency consumes less energy under the same cooling capacity, and vice versa.

[0134] The above-mentioned current power refers to the sum of the powers of all functional modules of the refrigerant circulation subsystem when it is currently running. The above-mentioned functional modules may be all operable modules included in the refrigerant circulation subsystem, such as indoor modules and outdoor modules in the air-conditioning system.

[0135] The above-mentioned target energy efficiency refers to the predicted higher energy efficiency that the refrigerant circulation subsystem can achieve, under which the operating efficiency of the refrigerant circulation subsystem can be improved.

[0136] The above target power refers to the predicted power value of the refrigerant circulation subsystem corresponding to the above target energy efficiency.

[0137] In one embodiment, after obtaining a set of parameters of the refrigerant circulation subsystem during operation, the executing entity of the embodiment of the present application can determine the current energy efficiency and current power of the refrigerant circulation subsystem according to the above parameter set, and predict the target energy efficiency and target power to be achieved.

[0138] As an optional implementation method, the execution subject of the embodiment of the present application can process the preset parameters in the parameter set according to the preset processing method to obtain the current energy efficiency and current power of the refrigerant circulation subsystem.

[0139] As another optional implementation, the execution subject of the embodiment of the present application may input the parameters in the above parameter set into a pre-trained performance test model, and obtain the target energy efficiency and target power output by the performance test model. The above performance test model may be pre-trained to predict the highest target energy efficiency and corresponding target power that the refrigerant circulation subsystem can achieve during operation.

[0140] As for how to determine the current energy efficiency and current power of the refrigerant circulation subsystem based on the above parameter set, as well as predict the target energy efficiency and target power to be achieved, it can be seen in the following text. Figure 8 The process shown is explained and will not be described in detail here.

[0141] Step 703: Determine the operation mode of the liquid storage module according to the current energy efficiency, target energy efficiency, current power, and target power.

[0142] Step 704: According to the above operation mode, adjust the switch status of the liquid inlet valve, the gas balance valve, and the liquid discharge valve connected to the liquid storage module.

[0143] The following is a unified description of step 703 and step 704:

[0144] The above-mentioned operating mode refers to the operating mode corresponding to the energy efficiency of the refrigerant circulation subsystem reaching the target energy efficiency. The operating mode can be determined by the switching status of the liquid inlet valve, the gas balancing valve, and the drain valve in the liquid storage module, that is, the combination of different switching states of the above-mentioned liquid inlet valve, the gas balancing valve, and the drain valve can obtain different operating modes.

[0145] Among them, through Figure 3 From the description of the system shown, it can be seen that the operating mode of the energy storage module may include a refrigerant storage mode and a refrigerant discharge mode. Further, the above-mentioned refrigerant storage mode may include a fast refrigerant storage mode (the air intake valve and the gas balancing valve are open, and the drain valve is closed) and a flexible refrigerant storage mode (the air intake valve is open, and the gas balancing valve and the drain valve are closed). The above-mentioned refrigerant discharge mode may include a fast refrigerant discharge mode (the drain valve and the gas balancing valve are open, and the air intake valve is closed) and a flexible refrigerant discharge mode (the drain valve is open, and the gas balancing valve and the air intake valve are closed).

[0146] In an embodiment of the present application, after determining the current energy efficiency and current power of the refrigerant circulation subsystem and predicting the target energy efficiency and target power to be achieved, the executing entity of the embodiment of the present application can determine the operating mode of the liquid storage module based on the above current energy efficiency, current power, target energy efficiency, and target power.

[0147] Afterwards, the switching states of the liquid inlet valve, gas balance valve, and drain valve connected to the liquid storage module can be adjusted according to the operating mode. Therefore, when it is determined that the energy efficiency of the refrigerant circulation subsystem has not reached the optimal target energy efficiency, the amount of refrigerant for the refrigerant circulation subsystem can be increased or decreased in time to make the energy efficiency of the refrigerant circulation subsystem reach the target energy efficiency.

[0148] The technical solution provided in the embodiment of the present application obtains a set of parameters involved in the operation of the refrigerant circulation subsystem in the refrigerant circulation system, determines the current energy efficiency and current power of the refrigerant circulation subsystem according to the parameter set, and predicts the target energy efficiency and target power to be achieved, determines the operation mode of the liquid storage module according to the current energy efficiency, target energy efficiency, current power, and target power, and adjusts the switching states of the liquid inlet valve, gas balancing valve, and liquid drain valve connected to the liquid storage module according to the operation mode. This technical solution determines the current energy efficiency and current power of the refrigerant circulation subsystem, and predicts the target energy efficiency and target power to be achieved, by referring to the parameter set involved in the operation of the refrigerant circulation subsystem. The various parameters included in the parameter set can more accurately predict the target energy efficiency of the refrigerant circulation subsystem. Afterwards, the operation mode of the liquid storage module can be determined according to the current energy efficiency, current power, target energy efficiency, and target power, and the operation of the liquid storage module can be controlled according to the operation mode. The liquid inlet valve, gas balance valve, and drain valve connected to the liquid storage module can control the liquid inlet and discharge speed of the liquid storage module through a combination of different switching states, so that the amount of refrigerant provided by the liquid storage module to the refrigerant circulation subsystem can be accurately controlled, thereby achieving more accurate control of the amount of refrigerant in the refrigerant circulation system.

[0149] See also Figure 8 , which is a flow chart of an embodiment of another method for controlling a refrigerant circulation system provided in an embodiment of the present application. Figure 8 The process shown in Figure 7 Based on the process shown, it describes how to obtain the parameter set involved in the operation of the refrigerant circulation subsystem when the refrigerant circulation subsystem includes at least one indoor module and at least one outdoor module, and how to determine the current energy efficiency and current power of the refrigerant circulation subsystem according to the parameter set, and predict the target energy efficiency and target power to be achieved. Figure 8 As shown, the process may include the following steps:

[0150] Step 801: Obtain the system operation mode of the refrigerant circulation subsystem.

[0151] Step 802: Obtain a set temperature value of at least one indoor module, and obtain an indoor temperature value through a temperature sensor installed in the indoor module.

[0152] Step 803: Obtain the outdoor temperature value through the temperature sensor installed in the outdoor module.

[0153] The following is a unified description of steps 801 to 803:

[0154] The above-mentioned refrigerant circulation subsystem refers to a system that realizes cooling or heating functions through refrigerant, such as an air conditioning system. The refrigerant circulation subsystem may include at least one indoor module and at least one outdoor module. The indoor module can be used to cool or heat the room, and the outdoor module can be used to coordinate the indoor module to realize cooling or heating the room, for example Figure 3 Outdoor heat exchanger shown.

[0155] The above-mentioned system operation mode refers to the current operation mode of the refrigerant circulation subsystem, which can be determined by the function currently implemented by the refrigerant circulation subsystem. For example, if the function currently implemented by the refrigerant circulation subsystem is to heat the indoor room, then the system operation mode of the refrigerant circulation subsystem is the cooling mode; when the function currently implemented by the refrigerant circulation subsystem is to heat the indoor room, the system operation mode of the refrigerant circulation subsystem is the heating mode, which may also include a dehumidification mode, other modes, etc., which is not limited in the embodiments of the present application.

[0156] In the embodiment of the present application, during the operation of the refrigerant circulation subsystem, the execution subject of the embodiment of the present application can obtain the system operation mode of the refrigerant circulation subsystem.

[0157] As an optional implementation method, the execution subject of the embodiment of the present application can determine the system operation mode of the refrigerant circulation subsystem according to the flow direction of the refrigerant in the refrigerant circulation subsystem. For example, when the flow direction of the refrigerant in the refrigerant circulation subsystem is Figure 5 As shown, it can be determined that the system operation mode of the refrigerant circulation subsystem is the cooling mode; when the flow direction of the refrigerant in the refrigerant circulation subsystem is Figure 6 As shown, it can be determined that the system operation mode of the refrigerant circulation subsystem is the heating mode.

[0158] In one embodiment, the refrigerant circulation subsystem includes an indoor module and an outdoor module with pre-installed temperature sensors. Based on this, the executing entity of the embodiment of the present application can obtain the set temperature value of at least one indoor module, and obtain the indoor temperature value through the temperature sensor installed in the indoor module, and obtain the outdoor temperature value through the temperature sensor installed in the outdoor module.

[0159] As an optional implementation, when there is only one indoor module, a set temperature value and an indoor temperature value can be obtained.

[0160] As another optional implementation, when there are multiple indoor modules, multiple set temperature values ​​and multiple indoor temperature values ​​can be obtained.

[0161] As an optional implementation, when there is only one outdoor module, one outdoor temperature value can be obtained.

[0162] As another optional implementation, when there are multiple outdoor modules, multiple outdoor temperature values ​​can be obtained.

[0163] Step 804: Determine the total output energy of the indoor module.

[0164] The above-mentioned total output energy refers to the total energy output by the current indoor module, which can be expressed by the total heat or total cooling output by the indoor module.

[0165] In one embodiment, the execution subject of the embodiment of the present application can determine the total output energy of the indoor module in real time or at a fixed time during the operation of the refrigerant circulation subsystem. Wherein, when there is one indoor module, the total output energy can be directly obtained, and when there are multiple indoor modules, multiple sub-output energies can be obtained, and the multiple sub-output energies are added together to obtain the total output energy.

[0166] As an optional implementation method, the air volume and enthalpy difference of the indoor module may be obtained, and preset calculations may be performed on the air volume and enthalpy difference to obtain the total output energy of the indoor module.

[0167] Step 805: Obtain a first power of the indoor module and a second power of the outdoor module.

[0168] Step 806: classify the operating mode, the at least one set temperature value, the at least one indoor temperature value, the at least one outdoor temperature value, the total output energy, the first power, and the second power into a parameter set.

[0169] To provide a unified description of step 805 and step 806:

[0170] The first power mentioned above refers to the current operating power of the indoor module.

[0171] The second power mentioned above refers to the current operating power of the outdoor module.

[0172] In one embodiment, the execution subject of the embodiment of the present application may respectively determine the first power of each indoor module and the second power of each outdoor module.

[0173] As an optional implementation method, the execution subject of the embodiment of the present application can obtain the first power of the indoor module by collecting the current and voltage of the indoor module and multiplying the current and voltage.

[0174] As an optional implementation method, the execution subject of the embodiment of the present application can obtain the second power of the outdoor module by collecting the current and voltage of the outdoor module currently running and multiplying the current and voltage.

[0175] In an embodiment of the present application, when the executing entity of the embodiment of the present application obtains the system operation mode of the refrigerant circulation subsystem, the set temperature value of at least one indoor module, at least one measured indoor temperature value, at least one outdoor temperature value, the total output energy, the first power of the indoor module, and the current second power of the outdoor module, the above-mentioned system operation mode, at least one set temperature value, at least one indoor temperature value, at least one outdoor temperature value, the total output energy, the first power of the indoor module, and the second power of the outdoor module can be classified into a preset parameter set to obtain the parameter set of the refrigerant circulation subsystem.

[0176] In addition, when a humidity sensor is installed in the indoor module, the current indoor humidity value can be obtained through the humidity sensor, and the indoor humidity value can be included in the parameter set.

[0177] In addition, when a humidity sensor is installed on the outdoor module, the current outdoor humidity value can be obtained through the humidity sensor, and the outdoor humidity value can be included in the parameter set.

[0178] Step 807: input the above-mentioned operation mode, at least one set temperature value, at least one indoor temperature value, and at least one outdoor temperature value into a preset performance test model to obtain the target energy efficiency and target power output by the performance test model.

[0179] The above-mentioned performance test model is a pre-trained model used to predict the highest target energy efficiency and target power that can be achieved by the refrigerant circulation subsystem based on the operating parameters of the refrigerant circulation subsystem.

[0180] In an embodiment of the present application, the operating mode, at least one set temperature value, at least one indoor temperature value, and at least one outdoor temperature value in the parameter set can be input into a pre-trained performance test model to obtain the target energy efficiency and target power output by the performance test model.

[0181] Step 808: Add the first power and the second power to obtain the current power.

[0182] Step 809: Divide the total output energy by the current power to obtain the current energy efficiency.

[0183] The following is a unified description of step 808 and step 809:

[0184] The above current power refers to the total power of all functional modules of the refrigerant circulation subsystem.

[0185] The above current energy efficiency refers to the proportional relationship between the energy consumed by the refrigerant circulation subsystem during the current operation and the cooling or heating effect it provides. An air conditioning system with high energy efficiency consumes less energy under the same cooling capacity, and vice versa.

[0186] In one embodiment, the execution subject of the embodiment of the present application can obtain the current power of the refrigerant circulation subsystem by adding the first power of the indoor module and the second power of the outdoor module.

[0187] In one embodiment, since the current energy efficiency refers to the proportional relationship between the energy consumed by the refrigerant circulation subsystem during the current operation and the cooling or heating effect it provides, and the above-mentioned current power is the energy consumed by all functional modules, and the above-mentioned total output energy is the cooling or heating effect to be output by the refrigerant circulation subsystem, the above-mentioned total output energy can be divided by the above-mentioned current power to obtain the current energy efficiency of the refrigerant circulation subsystem.

[0188] In addition, after obtaining the above-mentioned target energy efficiency, since the target energy efficiency is the maximum energy efficiency that can be achieved by the refrigerant circulation subsystem predicted by the performance test model, the executing entity of the embodiment of the present application can determine whether the target energy efficiency is greater than the above-mentioned current energy efficiency after obtaining the above-mentioned target energy efficiency. If so, it can be explained that the target energy efficiency predicted by the performance test model is more accurate; if not, it can be explained that the target energy efficiency predicted by the performance test model may have errors, and therefore the performance test model can continue to be trained through the above-mentioned parameters to improve the above-mentioned performance test model.

[0189] The technical solution provided by the embodiment of the present application obtains the system operation mode of the refrigerant circulation subsystem, the set temperature value of at least one indoor module, the indoor temperature value, the outdoor temperature value, the total output energy of the indoor module, the first power of the indoor module, and the second power of the outdoor module, thereby obtaining the parameter set of the refrigerant circulation subsystem during the current operation, and predicts the target energy efficiency and target power of the refrigerant circulation subsystem through a pre-trained performance test model, and determines the power of all indoor modules and outdoor modules in the refrigerant circulation subsystem as the current power, and divides the total output energy of the indoor module by the above current power to obtain the current energy efficiency of the refrigerant circulation subsystem. This technical solution, by obtaining a variety of different parameters of the refrigerant circulation subsystem during operation, and a pre-trained performance test model, can more efficiently and accurately determine the target energy efficiency and target power that the refrigerant circulation subsystem can achieve, thereby improving the accuracy of the current energy efficiency, current power, target energy efficiency, and target power, thereby achieving more accurate regulation of the amount of refrigerant in the refrigerant circulation subsystem.

[0190] See also Fig. 9 , which is a flow chart of an embodiment of another method for controlling a refrigerant circulation system provided in an embodiment of the present application. Fig. 9 The process shown in Figure 7 Based on the process shown in FIG. 1 , it describes how to determine the operation mode of the liquid storage module according to the current energy efficiency, target energy efficiency, current power, and target power. Fig. 9 As shown, the process may include the following steps:

[0191] Step 901, determine whether the current energy efficiency is less than the target energy efficiency, if so, execute step 902; if not, end the process.

[0192] Step 902: Compare the current power with the target power to obtain a comparison result.

[0193] Step 903: When the comparison result indicates that the current power is less than the target power, determine that the initial operation mode of the liquid storage module is a refrigerant exhaust mode.

[0194] Step 904: when the comparison result indicates that the current power is greater than or equal to the target power, determine that the initial operation mode of the liquid storage module is a refrigerant storage mode.

[0195] The following is a unified description of steps 901 to 904:

[0196] The above-mentioned initial operation mode refers to whether the liquid storage module is initially determined to discharge refrigerant or store refrigerant. Therefore, the initial operation mode can be a refrigerant discharge mode or a refrigerant storage mode.

[0197] The above-mentioned refrigerant discharge mode refers to a mode in which the storage module discharges refrigerant to the refrigerant circulation subsystem. At this time, the discharge valve of the liquid storage module is in an open state, and the liquid inlet valve is in a closed state.

[0198] The above-mentioned refrigerant storage mode refers to a mode in which the storage module obtains refrigerant from the refrigerant circulation subsystem and stores it. At this time, the liquid inlet valve of the liquid storage module is in an open state and the liquid discharge valve is in a closed state.

[0199] In the embodiment of the present application, after determining the current energy efficiency and the target energy efficiency of the refrigerant circulation subsystem, it can be determined whether the current energy efficiency is less than the target energy efficiency.

[0200] Optionally, if it is determined that the current energy efficiency is greater than or equal to the target energy efficiency, it means that the current energy efficiency of the refrigerant circulation subsystem has reached the maximum energy efficiency, and there is no need to adjust the refrigerant amount to improve the energy efficiency. The process can be ended at this time.

[0201] Optionally, if it is determined that the current energy efficiency is less than the target energy efficiency, it means that the current energy efficiency of the refrigerant circulation subsystem has not reached a higher energy efficiency and its efficiency is low. Therefore, the current power can continue to be compared with the target power to determine the initial operating mode of the liquid storage module based on the comparison results.

[0202] As an exemplary embodiment, when the above comparison result indicates that the current power is less than the target power, it means that the amount of refrigerant corresponding to the current power in the refrigerant circulation subsystem has not reached the amount of refrigerant corresponding to the target power. Therefore, it can be determined that the amount of refrigerant in the refrigerant circulation subsystem can be increased, that is, the initial operating mode of the liquid storage module is the refrigerant discharge mode.

[0203] As another exemplary embodiment, when the above comparison result indicates that the current power is greater than or equal to the target power, it means that the amount of refrigerant corresponding to the current power in the refrigerant circulation subsystem is greater than the amount of refrigerant corresponding to the target power. Therefore, it can be determined that the amount of refrigerant in the refrigerant circulation subsystem can be reduced, that is, the initial operating mode of the liquid storage module is the refrigerant storage mode.

[0204] Step 905: Determine a comparison power interval corresponding to the initial operation mode.

[0205] Step 906: Determine the operation mode of the liquid storage module according to the current power and the comparison power range.

[0206] Step 907: According to the above operation mode, adjust the switch status of the liquid inlet valve, gas balance valve, and liquid discharge valve connected to the liquid storage module.

[0207] The following is a unified description of steps 905 to 907:

[0208] The above-mentioned comparative power interval refers to a plurality of different intervals corresponding to a predetermined initial mode for comparing the current power. By comparing the current power with the comparative power interval, the rate of adjusting the refrigerant amount can be further determined, thereby determining whether it is necessary to open the gas balance valve of the liquid storage module, thereby determining the operating mode of the liquid storage module.

[0209] The above-mentioned operating mode refers to a mode that includes all the switch states of the liquid inlet valve, the gas balance valve, and the liquid discharge valve in the liquid storage module.

[0210] In the embodiment of the present application, each operation mode may correspond to a plurality of different comparative power intervals. Based on this, after determining the initial operation mode of the liquid storage module, the execution subject of the embodiment of the present application may determine the comparative power interval corresponding to the initial operation mode, and determine the operation mode of the liquid storage module according to the above current power and the above comparative power interval. Afterwards, the switch states of the liquid inlet valve, gas balance valve, and liquid discharge valve connected to the liquid storage module may be adjusted according to the operation mode.

[0211] As an optional implementation, when the initial operation mode is the refrigerant discharge mode, the comparison power interval corresponding to the initial operation mode may include a first liquid discharge power interval and a second liquid discharge power interval. The power of the first liquid discharge power interval is less than the power of the second liquid discharge power interval, and the power of the second liquid discharge power interval is less than the target power. Since the current power is less than the target power in the refrigerant discharge mode, the difference between the power in the first liquid discharge power interval and the target power is large, while the difference between the power in the second liquid discharge power interval and the target power is small.

[0212] As an exemplary embodiment, a first comparison threshold value less than the target power may be determined, based on which the power within the first drainage power interval may be less than the first comparison threshold value, and the power within the second drainage power interval may be greater than or equal to the first comparison threshold value and less than the target power.

[0213] Based on this, when determining the operation mode of the liquid storage module according to the current power and the comparative power interval, it can be determined whether the current power belongs to the first liquid discharge power interval or the second liquid discharge power interval.

[0214] Optionally, when it is determined that the current power belongs to the first liquid discharge power range, it means that the difference between the current power and the target power is large, and a large amount of refrigerant needs to be quickly provided to the refrigerant circulation subsystem. Therefore, the operation mode of the liquid storage module can be determined as the rapid refrigerant discharge mode.

[0215] Based on this, in the rapid refrigerant discharge mode, when the executing body of the embodiment of the present application controls the operating state of the liquid storage module, in order to achieve the purpose of rapid refrigerant discharge, the gas balance valve can be controlled to open to adjust the pressure in the liquid storage module to quickly discharge the refrigerant. Therefore, the liquid inlet valve connected to the liquid storage module can be controlled to close, the gas balance valve to open, and the liquid discharge valve to open.

[0216] Optionally, when it is determined that the current power belongs to the second liquid discharge power range, it means that the difference between the current power and the target power is small, and a smaller amount of refrigerant needs to be provided to the refrigerant circulation subsystem. The refrigerant discharge rate of the liquid storage module is not easy to be too fast. Therefore, it can be determined that the operation mode of the liquid storage module is a flexible refrigerant discharge mode.

[0217] Based on this, in the flexible refrigerant discharge mode, when the executive body of the embodiment of the present application controls the operating state of the liquid storage module, in order to achieve the purpose of providing a smaller amount of refrigerant to the refrigerant circulation subsystem, the gas balance valve can be controlled to be closed at this time, so that there is a certain pressure in the liquid storage module to slowly discharge the refrigerant. Therefore, the liquid inlet valve connected to the liquid storage module can be controlled to be closed, the gas balance valve can be closed, and the liquid discharge valve can be opened.

[0218] As another optional implementation, when the above-mentioned initial operation mode is the refrigerant storage mode, the comparison power interval corresponding to the above-mentioned initial operation mode may include a first liquid storage power interval and a second liquid storage power interval. Among them, the power of the above-mentioned first liquid storage power interval is less than the power of the second liquid storage power interval, and the power of the above-mentioned first liquid storage power interval is greater than the target power. Since the current power is greater than or equal to the target power in the refrigerant storage mode, the difference between the power in the above-mentioned first liquid storage power interval and the target power is small, while the difference between the power in the second liquid storage power interval and the target power is large.

[0219] As an exemplary embodiment, a second comparison threshold greater than the target power can be determined, based on which the power within the first liquid storage power interval can be greater than the target power and less than the second comparison threshold, and the power within the second liquid storage power interval can be greater than or equal to the second comparison threshold.

[0220] Based on this, when determining the operation mode of the liquid storage module according to the current power and the comparison power interval, it can be determined whether the current power belongs to the first liquid storage power interval or the second liquid storage power interval.

[0221] Optionally, when it is determined that the current power belongs to the first liquid storage power interval, it means that the difference between the current power and the target power is small, and a smaller amount of refrigerant needs to be obtained from the refrigerant circulation subsystem for storage. Therefore, it can be determined that the operation mode of the liquid storage module is a flexible refrigerant storage mode.

[0222] Based on this, in the flexible refrigerant storage mode, when the executive body of the embodiment of the present application controls the operating state of the liquid storage module, in order to achieve the purpose of slowly obtaining the exhaust refrigerant from the refrigerant circulation subsystem for storage, the gas balance valve can be controlled to be closed at this time, so that a certain pressure buffer is adjusted in the liquid storage module to absorb the refrigerant in the refrigerant circulation subsystem. Therefore, the liquid inlet valve connected to the liquid storage module can be controlled to be opened, the gas balance valve can be closed, and the liquid discharge valve can be closed.

[0223] Optionally, when it is determined that the current power belongs to the second liquid storage power interval, it means that the difference between the current power and the target power is large, and a large amount of refrigerant needs to be quickly obtained from the refrigerant circulation subsystem. Therefore, it can be determined that the operating mode of the liquid storage module is a rapid refrigerant storage mode.

[0224] Based on this, in the rapid refrigerant storage mode, when the executive body of the embodiment of the present application controls the operating state of the liquid storage module, in order to achieve the purpose of quickly obtaining a larger amount of refrigerant from the refrigerant circulation subsystem for storage, the gas balance valve can be controlled to open at this time, so that there is a smaller pressure in the liquid storage module so that the refrigerant can be quickly absorbed. Therefore, the liquid inlet valve connected to the liquid storage module can be controlled to open, the gas balance valve can be opened, and the liquid discharge valve can be controlled to open.

[0225] The technical solution provided by the embodiment of the present application obtains a comparison result by comparing the current power with the target power when it is determined that the current energy efficiency is less than the target energy efficiency. When the above comparison result indicates that the current power is less than the target power, the initial operation mode of the liquid storage module is determined to be the refrigerant discharge mode. When the above comparison result indicates that the current power is greater than or equal to the above target power, the initial operation mode of the liquid storage module is determined to be the refrigerant storage mode. The comparison power interval corresponding to the initial operation mode is determined. According to the above current power and the comparison power interval, the operation mode of the liquid storage module is determined. According to the above operation mode, the switch states of the liquid inlet valve, the gas balancing valve, and the liquid discharge valve connected to the liquid storage module are adjusted. This technical solution determines the initial operation mode of the liquid storage module by comparing the current power with the target power, and then further determines the final operation mode of the liquid storage module according to the refined comparison power interval corresponding to each initial operation mode. It can compare the current power with the power intervals in different ranges to determine the amount of refrigerant that needs to be adjusted in the refrigerant circulation subsystem, thereby determining the control of the switching states of the liquid inlet valve, gas balance valve, and drain valve connected to the liquid storage module, thereby more accurately determining the operation mode of the liquid storage module to adjust the amount of refrigerant that needs to be adjusted in the refrigerant circulation subsystem, thereby more accurately adjusting the amount of refrigerant in the cold storage system.

[0226] See also Fig.10 , which is a flow chart of an embodiment of a control method for a refrigerant circulation system provided in an embodiment of the present application. Fig.10 The process shown in Fig. 9 Based on the process shown in FIG. 1 , the operation time of the storage mode in the determined operation mode is further determined. Fig.10 As shown, the process may include the following steps:

[0227] Step 1001: after determining the operation mode of the liquid storage module according to the current power and the comparative power interval, determine the target sub-power interval to which the current power belongs, wherein each comparative power interval may correspond to multiple sub-power intervals.

[0228] Step 1002: Determine the operating duration corresponding to the target sub-power interval as the target duration.

[0229] The following is a unified description of step 1001 and step 1002:

[0230] The above current power refers to Figure 7 The total power currently being operated by the circulating refrigerant subsystem determined in the process shown.

[0231] The above comparison power range refers to Fig. 9In the process shown, the comparison power interval corresponding to the initial operation mode, when the initial operation mode is the refrigerant discharge mode, the corresponding comparison power interval may include the first liquid discharge power interval and the second liquid discharge power interval, and the power in the first liquid discharge power interval is less than the power in the second liquid discharge power interval; when the current initial operation mode is the refrigerant storage mode, the corresponding comparison power interval may include the first liquid storage power interval and the second liquid storage power interval, and the power in the first liquid storage power interval is less than the power in the second liquid storage power interval. Further, the power in the second liquid discharge power interval is less than the target power, and the power in the first liquid storage power interval is greater than the target power.

[0232] The above target duration refers to the final duration of the liquid storage module running in the operating mode.

[0233] In an embodiment of the present application, after determining the operating mode of the liquid storage module, in order to further accurately control the amount of refrigerant in the refrigerant circulation subsystem, the comparison power interval corresponding to each operating mode can be further divided into multiple sub-power intervals to determine the operating duration of the operating mode, thereby achieving accurate control of the amount of refrigerant in the refrigerant circulation subsystem.

[0234] Based on this, each of the above-mentioned comparison power intervals may include multiple sub-power intervals, and each sub-power interval may correspond to an operating time, wherein the above-mentioned operating time is positively correlated with the absolute value of the difference corresponding to the sub-power interval, and the above-mentioned absolute value of the difference is the absolute value of the difference between any power value in the sub-power interval and the target power, that is, the larger the absolute value of the difference between the sub-power interval and the target power, the longer the corresponding operating time. For example, when the sub-power interval is greater than the target power, the sub-power interval with a larger difference from the target power has a longer corresponding operating time; when the sub-power interval is less than the target power, the sub-power interval with a smaller difference from the target power (the difference is a negative value) has a longer corresponding operating time.

[0235] In one embodiment, after determining the operating mode of the liquid storage module, the executing entity of the embodiment of the present application may determine the target sub-power interval to which the current power belongs, and determine the operating time corresponding to the target sub-power interval as the target time.

[0236] For example, suppose the current power is P and the target power is P t The comparative power interval of each operating mode, the sub-power intervals included in each comparative power interval, and the operating time corresponding to each sub-power interval may be shown in the following Table 2:

[0237] Table 2

[0238]

[0239]

[0240] Among them, it can be seen from Table 1 that the comparative power range corresponding to the rapid refrigerant discharge mode of the liquid storage module is (1, P t -δP1), the sub-power intervals included in the comparison power interval may include: (0, P t -δP1-δP 11 ),[P t -δP1-δP 11 , P t -δP1-δP 12 ), and [P t -δP1-δP 12 , P t -δP1), further, the above (0, P t -δP1-δP 11 ) corresponds to a running time of T 11 , [P t -δP1-δP 11 , P t -δP1-δP 12 ) corresponds to a running time of T 12 , [P t -δP1-δP 12 , P t -δP1) corresponds to a running time of T 13 Among them, δP1, δP 11 , and δP 12 is the preset comparison threshold, δP 11 >δP 12 , T 11 >T 12 >T 13 , that is, the further the current power deviates from the target power, the longer the running time.

[0241] The comparison interval corresponding to the flexible refrigerant discharge mode of the liquid storage module can be (P t -δP1,P t ), the sub-power intervals included in the comparison power interval may include: (P t -δP1,P t -δP 21 ),[P t -δP 21 , P t -δP 22 ), and [P t -δP 22 , P t ), further, the above (P t -δP1,P t -δP 21 ) corresponds to a running time of T 21 , [Pt -δP 21 , P t -δP 22 ) corresponds to a running time of T 22 , [P t -δP 22 , P t ) corresponds to a running time of T 23 Among them, δP1, δP 21 , and δP 22 is the preset comparison threshold, and δP1>δP 21 >δP 22 , T 21 >T 22 >T 23 , that is, the further the current power deviates from the target power, the longer the running time.

[0242] The comparison interval corresponding to the flexible refrigerant storage mode of the liquid storage module can be (P t , P t +δP3), the sub-power intervals included in the comparison power interval may include: (P t , P t +δP 31 ),[P t +δP 31 , P t +δP 32 ), and [P t +δP 32 , P t +δP3), further, the above (P t , P t +δP 31 ) corresponds to a running time of T 31 , [P t +δP 31 , P t +δP 32 ) corresponds to a running time of T 32 , [P t +δP 32 , P t +δP3) corresponds to a running time of T 33 Among them, δP3, δP 31 , and δP 32 is the preset comparison threshold, and δP3>δP 32 >δP 31 , T 33 >T 32 >T 31 , that is, the further the current power deviates from the target power, the longer the running time.

[0243] The comparison interval corresponding to the rapid refrigerant storage mode of the liquid storage module can be (P t +δP3, +∞), the sub-power intervals included in the comparison power interval may include: (P t +δP3,P t +δP3+δP 41 ),[P t +δP3+δP 41 , P t +δP3+δP 42 ), and [P t +δP 32 +δP 42 , +∞), further, the above (P t +δP3,P t +δP3+δP 41 ) corresponds to a running time of T 41 ,[P t +δP3+δP 41 , P t +δP3+δP 42 ) corresponds to a running time of T 42 ,[P t +δP 32 +δP 42 , +∞) corresponds to a running time of T 43 Among them, δP3, δP 41 , and δP 42 is the preset comparison threshold, and δP 42 >δP 41 , T 43 >T 42 >T 41 , that is, the further the current power deviates from the target power, the longer the running time.

[0244] Step 1003: According to the operation mode, adjust the switch status of the liquid inlet valve, the gas balance valve, and the liquid discharge valve connected to the liquid storage module.

[0245] Step 1004: Keep the liquid storage module running in the current operating state for the above target time.

[0246] The following is a unified description of step 1003 and step 1004:

[0247] In an embodiment of the present application, after determining the operating duration of the operating mode, the executing entity of the embodiment of the present application can adjust the switching states of the liquid inlet valve, the gas balance valve, and the liquid discharge valve connected to the liquid storage module according to the above operating mode, and keep the liquid storage module running in the current operating state for the above target duration, so as to control the adjustment speed and adjustment duration of the refrigerant in the refrigerant circulation subsystem by the liquid storage module, thereby accurately controlling the amount of refrigerant in the refrigerant circulation subsystem.

[0248] The technical solution provided by the embodiment of the present application is to determine the target sub-power interval to which the current power belongs after determining the operation mode of the liquid storage module according to the current power and the comparison power interval, wherein each comparison power interval may correspond to multiple sub-power intervals, and the operation duration corresponding to the target sub-power interval is determined as the target duration, and the switch states of the liquid inlet valve, the gas balance valve, and the liquid discharge valve connected to the liquid storage module are adjusted according to the operation mode to keep the liquid storage module running for the above target duration in the current operation state. This technical solution can compare the current power with the multiple sub-power intervals included in the comparison power interval after determining the operation mode of the liquid storage mode, so as to determine the operation duration corresponding to the operation mode according to the sub-power interval to which the current power belongs, thereby realizing a more accurate determination of the operation duration of the operation mode, so as to more accurately control the adjustment rate and adjustment duration of the liquid storage module on the amount of refrigerant in the refrigerant circulation subsystem, so as to accurately control the amount of refrigerant in the refrigerant circulation system.

[0249] See also Fig.11 , is a flow chart of an embodiment of a control method for a refrigerant circulation system provided in an embodiment of the present application. Fig.11 The process shown in Figure 7 Based on the process shown, the control method of the refrigerant circulation system provided in the embodiment of the present application is described by taking the refrigerant conditioning subsystem as a multi-split air conditioning system as an example. Fig.11 As shown, the process may include the following steps:

[0250] (1) Read

[0251] Use the sensors arranged on the system to read the required parameters and transmit them to the calculation layer. The required parameters are divided into multiple types. System operation mode: mainly including cooling or heating, etc. Indoor side set temperature Tset: the target temperature set by the user for the indoor unit of the air conditioner. When there are multiple indoor units, they should be counted separately. Indoor temperature Tinside and outdoor temperature Toutside: the indoor unit and outdoor unit are respectively equipped with temperature sensors to measure indoor and outdoor temperatures. When there are multiple indoor units or outdoor units, they should be counted separately. In addition to temperature, some units are also equipped with humidity sensors, which also read the indoor humidity Hinside and outdoor humidity Houtside and transmit them. System capacity and power: The system capacity is the cooling capacity or heating capacity of the system, which is the sum of the cooling or heat output that the indoor unit of the system can bring to the indoor environment. The system power needs to count the sum of the power data of the outdoor and indoor sides of the system.

[0252] (2) Calculation

[0253] Substitute the relevant parameters read above into the performance prediction model to calculate the corresponding target energy efficiency and target power Pt.

[0254] Among them, the performance prediction model is a model calibrated and summarized after a large number of tests under different operating conditions in the laboratory before the unit leaves the factory. It includes the mapping relationships between various parameter conditions such as different operating modes, set temperatures, and ambient temperatures and system energy efficiency and power. During the substitution calculation process, the preset parameter conditions closest to the input values are found and interpolated according to certain rules. The calculated energy efficiency and power are used as the target energy efficiency and power under the current parameter conditions of the system.

[0255] At the same time, according to the read capacity and power, the system energy efficiency is calculated by division.

[0256] (3) Judgment

[0257] First, compare the system energy efficiency and the target energy efficiency If it indicates that the current energy efficiency still needs to be improved to achieve the maximization of energy efficiency. If it indicates that the current energy efficiency has been maximized and the system is in an optimal operating state. At this time, remember the current system operating mode, set temperature, ambient temperature and other parameter conditions and energy efficiency, and add them to the database of the performance prediction model, which can provide a reference for future refrigerant adjustment.

[0258] Then, when the energy efficiency needs to be improved, in order to determine the refrigerant adjustment direction, it is still necessary to compare the current power P and the target power Pt. If P < Pt, it means that there is too little refrigerant in the current system, and the liquid discharge function of the liquid storage tank should be turned on to increase the refrigerant circulation volume in the system; if P ≥ Pt, it means that there is too much refrigerant in the current system, and the liquid storage function of the liquid storage tank should be turned on to reduce the refrigerant circulation volume in the system.

[0259] After determining the basic refrigerant adjustment direction, it is still necessary to further refine the liquid discharge method or liquid storage method according to the power P. As shown in the following table, the power is divided into 4 large intervals, and each large interval can be further divided into multiple sub-intervals. The specific number of subdivisions is not limited. Here, 3 sub-intervals shown in Table 3 are taken as an example for illustration.

[0260] Table 3 (4) Action

[0261]

[0262] ① Power interval P < (Pt - δP1):

[0263] When the power is in this interval, it means that the current power is not only lower than the target power, but also far lower than the target power. Among them, δP1 is a preset value of the system. It can be seen that the refrigerant in the system is severely lacking, and the fast refrigerant discharge method should be used to quickly increase the refrigerant circulation volume in the system.

[0264] Further subdivision: when P < (Pt - δP1) - δP11, the execution time of the rapid refrigerant discharge is T11; when (Pt - δP1) - δP11 ≤ P < (Pt - δP1) - δP12, the execution time of the rapid refrigerant discharge is T12; when (Pt - δP1) - δP12 ≤ P < (Pt - δP1), the execution time of the rapid refrigerant discharge is T13. Among them, δP11 > δP12, T11 > T12 > T13, following the principle that the farther the system power deviates from the target value, the longer the adjustment duration.

[0265] ② Power range (Pt - δP1) ≤ P < Pt:

[0266] When the power is in this range, it indicates that the current power is slightly lower than the target power and the refrigerant amount in the system is slightly insufficient. Therefore, the flexible refrigerant discharge method is adopted to increase the refrigerant circulation amount in the system.

[0267] Further subdivision: when (Pt - δP1) ≤ P < Pt - δP21, the execution time of the flexible refrigerant discharge is T21; when Pt - δP21 ≤ P < Pt - δP22, the execution time of the flexible refrigerant discharge is T22; when Pt - δP22 ≤ P < Pt, the execution time of the flexible refrigerant discharge is T23. Among them, δP1 > δP21 > δP22, T11 > T12 > T13, following the principle that the farther the system power deviates from the target value, the longer the adjustment duration.

[0268] ③ Power range Pt < P < (Pt + δP3)

[0269] When the power is in this range, it indicates that the current power is slightly higher than the target power and the refrigerant amount in the system is slightly excessive. Therefore, the flexible refrigerant storage method is adopted to reduce the refrigerant circulation amount in the system. Where δP3 is a preset value of the system.

[0270] Further subdivision: when Pt ≤ P < Pt + δP31, the execution time of the flexible refrigerant storage is T31; when Pt + δP31 ≤ P < Pt + δP32, the execution time of the flexible refrigerant storage is T32; when Pt + δP32 ≤ P < (Pt + δP3), the execution time of the flexible refrigerant storage is T33. Among them, δP3 > δP32 > δP31, T33 > T32 > T31, following the principle that the farther the system power deviates from the target value, the longer the adjustment duration.

[0271] ④ Power range (Pt + δP3) ≤ P

[0272] When the power is in this range, it indicates that the current power is not only higher than the target power but also much higher than the target power. It can be seen that the refrigerant in the system is seriously excessive, and the rapid refrigerant storage method should be used to quickly reduce the refrigerant circulation amount in the system.

[0273] Further subdividing, when (Pt + δP3) ≤ P < (Pt + δP3) + δP41, the execution time of the rapid refrigerant storage is T41; when (Pt + δP3) + δP41 ≤ P < (Pt + δP3) + δP42, the execution time of the rapid refrigerant storage is T42; when (Pt + δP3) + δP42 ≤ P, the execution time of the rapid refrigerant storage is T43. Among them, δP42 > δP41, T43 > T42 > T41, following the principle that the farther the system power deviates from the target value, the longer the adjustment duration.

[0274] During adjustment, the cumulative number of adjustment cycles is counted as 1 each time an adjustment is made.

[0275] After the adjustment is completed, wait for the system to stabilize. The criterion for system stability can be judged according to a set fixed waiting time, that is, after the adjustment is completed, after waiting for a fixed duration, the system is considered to reach a new steady state. Or it can also be judged according to the fact that the system parameters no longer change, such as parameters such as the high pressure, low pressure, compressor frequency, and indoor unit expansion valve opening of the system.

[0276] After the system is stable, if the cumulative number of cycles i has not reached the upper limit value imax, that is, i < imax, (imax is the upper limit of the number of adjustments set by the system), then compare the current energy efficiency and the target energy efficiency If it indicates that the current energy efficiency still needs to be improved, and enter the judgment of the next refrigerant adjustment; if it indicates that the current energy efficiency has been maximized and the system is in the optimal operating state. At this time, remember the system operating mode, set temperature, ambient temperature and other parameter conditions and energy efficiency, and add them to the database of the performance prediction model, which can provide reference for future refrigerant adjustments.

[0277] If the cumulative number of cycles i has reached the upper limit value imax, that is, i ≥ imax, it means that the target energy efficiency cannot be achieved even after adjusting to the limit. Possible reasons include: the influence of the length of the engineering installation pipeline, the influence of the installation height difference of the indoor unit, the influence of equipment aging, the influence of refrigerant leakage, etc. Record the actual energy efficiency in this case Optionally, if the system repeatedly fails to reach the target energy efficiency even after adjusting to the limit under this operating condition the situation, then in the database of the energy efficiency prediction model, update the actually achieved energy efficiency to the target energy efficiency to guide subsequent refrigerant adjustments.

[0278] The control method of the refrigerant circulation system provided by the embodiments of the present application has the following beneficial effects:

[0279] (1) A multi-split system capable of adjusting the refrigerant circulation volume is provided with a liquid inlet valve, a liquid discharge valve and a gas balance valve, which are connected to the medium-pressure and low-pressure sides of the system pipeline to ensure sufficient inlet and outlet refrigerant pressure difference. The refrigerant volume adjustment speed can be changed by combining the valve switch and coordinating the valve switch duration, thereby adapting to the needs of adjusting various refrigerants.

[0280] (2) A model that can calculate target energy efficiency and target power based on actual usage, and can continuously update and correct the model based on refrigerant adjustment results.

[0281] (3) A method for adjusting the refrigerant can be used according to the target energy efficiency and the target power, and different refrigerant adjustment methods and adjustment times can be selected according to the gap between the actual energy efficiency and the target energy efficiency, and the gap between the actual power and the target power, thereby shortening the adjustment time.

[0282] See also Fig.12 , is a block diagram of an embodiment of a control device for a refrigerant circulation system provided in an embodiment of the present application. As an embodiment, the device can be applied to Figures 1 to 3 Any of the refrigerant circulation systems shown. Fig.12 As shown, the device may include:

[0283] An acquisition module 1201 is used to acquire a set of parameters involved in the operation of a refrigerant circulation subsystem in the refrigerant circulation system;

[0284] A first determination module 1202 is used to determine the current energy efficiency and current power of the refrigerant circulation subsystem according to the parameter set, and predict the target energy efficiency and target power to be achieved;

[0285] A second determination module 1203 is used to determine an operation mode of a liquid storage module according to the current energy efficiency, the target energy efficiency, the current power, and the target power;

[0286] The regulating module 1204 is used to regulate the switch states of the liquid inlet valve, the gas balance valve, and the liquid discharge valve connected to the liquid storage module according to the operation mode.

[0287] like Fig.13 As shown, it is a structural schematic diagram of an electronic device provided in an embodiment of the present application, including a processor 1301, a communication interface 1302, a memory 1303 and a communication bus 1304, wherein the processor 1301, the communication interface 1302, and the memory 1303 communicate with each other through the communication bus 1304.

[0288] Memory 1303, used for storing computer programs;

[0289] In one embodiment of the present application, the processor 1301 is used to execute the program stored in the memory 1303 to implement the control method of the refrigerant circulation system provided by any of the above method embodiments, including:

[0290] Acquire a set of parameters involved in the operation of a refrigerant circulation subsystem in the refrigerant circulation system;

[0291] Determine the current energy efficiency and current power of the refrigerant circulation subsystem according to the parameter set, and predict the target energy efficiency and target power to be achieved;

[0292] Determining an operation mode of a liquid storage module according to the current energy efficiency, the target energy efficiency, the current power, and the target power;

[0293] According to the operation mode, the switch states of the liquid inlet valve, the gas balance valve, and the liquid discharge valve connected to the liquid storage module are adjusted.

[0294] An embodiment of the present application further provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the control method for a refrigerant circulation system provided in any one of the aforementioned method embodiments are implemented.

[0295] The device embodiments described above are merely illustrative, wherein 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 on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0296] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a general hardware platform, and of course, by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the relevant technology can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for 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.

[0297] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0298] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A refrigerant circulation system, characterized in that: include: A refrigerant circulation subsystem and a liquid storage module, wherein the refrigerant circulation subsystem comprises a first pressure pipeline and a second pressure pipeline, and the pressure of the first pressure pipeline is greater than the pressure of the second pressure pipeline; The liquid storage module is connected to the first pressure pipeline through a first pipeline, and a liquid inlet valve is installed on the first pipeline; the refrigerant in the refrigerant circulation subsystem flows into the liquid storage module through the first pipeline; The liquid storage module is connected to the second pressure pipeline through a second pipeline, and a gas balance valve is installed on the second pipeline. The gaseous refrigerant in the liquid storage module flows into the refrigerant circulation subsystem through the second pipeline; the gas balance valve is used to adjust the flow rate of the refrigerant in the liquid storage module; The liquid storage module is connected to the second pressure pipeline via a third pipeline, and a drain valve is installed on the third pipeline; the liquid refrigerant in the liquid storage module flows into the refrigerant circulation subsystem via the third pipeline.

2. The refrigerant circulation system according to claim 1, characterized in that: The liquid storage module is connected to the first pipeline through the first end at the top; The liquid storage module is connected to the second pipeline via the second end at the top; The liquid storage module is connected to the third pipeline via a third end at the bottom.

3. The refrigerant circulation system according to claim 2, characterized in that: The refrigerant circulation system further includes a fourth pipeline; The first end of the fourth pipeline is connected to the first end of the top of the liquid storage module; The second end of the fourth pipeline is connected to the second pressure pipeline; The fourth pipeline is equipped with an unloading valve.

4. A control method for a refrigerant circulation system, characterized in that: Applied to the refrigerant circulation system according to any one of claims 1 to 3, the method comprises: Acquire a set of parameters involved in the operation of a refrigerant circulation subsystem in the refrigerant circulation system; Determine the current energy efficiency and current power of the refrigerant circulation subsystem according to the parameter set, and predict the target energy efficiency and target power to be achieved; Determining an operation mode of a liquid storage module according to the current energy efficiency, the target energy efficiency, the current power, and the target power; According to the operation mode, the switch states of the liquid inlet valve, the gas balance valve, and the liquid discharge valve connected to the liquid storage module are adjusted.

5. The method according to claim 4, characterized in that The refrigerant circulation subsystem includes at least one indoor module and at least one outdoor module, the indoor module is used to cool or heat the room, and the obtaining of a set of parameters involved in the operation of the refrigerant circulation subsystem in the refrigerant circulation system includes: Obtaining a system operation mode of the refrigerant circulation subsystem; Obtaining a set temperature value of at least one of the indoor modules, and obtaining an indoor temperature value through a temperature sensor installed in the indoor module; Obtaining an outdoor temperature value through a temperature sensor installed in the outdoor module; Determining the total output energy of the indoor module; Acquire a first power of the indoor module and a second power of the outdoor module; The system operation mode, at least one of the set temperature values, at least one of the indoor temperature values, at least one of the outdoor temperature values, the total output energy, the first power, and the second power are classified into the parameter set.

6. The method according to claim 5, characterized in that Determining the current energy efficiency and current power of the refrigerant circulation subsystem according to the parameter set, and predicting the target energy efficiency and target power to be achieved, includes: Inputting the system operation mode, at least one of the set temperature values, at least one of the indoor temperature values, and at least one of the outdoor temperature values ​​into a preset performance test model to obtain the target energy efficiency and target power output by the performance test model; Adding the first power and the second power to obtain the current power; The total output energy is divided by the current power to obtain the current energy efficiency.

7. The method according to claim 4, characterized in that The step of determining the operation mode of the liquid storage module according to the current energy efficiency, the target energy efficiency, the current power, and the target power includes: When it is determined that the current energy efficiency is less than the target energy efficiency, comparing the current power with the target power to obtain a comparison result; When the comparison result indicates that the current power is less than the target power, determining that the initial operation mode of the liquid storage module is a refrigerant exhaust mode; When the comparison result indicates that the current power is greater than or equal to the target power, determining that the initial operation mode of the liquid storage module is a refrigerant storage mode; Determining a comparative power interval corresponding to the initial operation mode; The operation mode of the liquid storage module is determined according to the current power and the comparison power interval.

8. The method according to claim 7, characterized in that The determining the comparison power interval corresponding to the initial operation mode includes: When the initial operation mode is a refrigerant discharge mode, the comparison power interval corresponding to the initial operation mode includes a first liquid discharge power interval and a second liquid discharge power interval; the power of the first liquid discharge power interval is less than the power of the second liquid discharge power interval, and the power of the second liquid discharge power interval is less than the target power; The step of determining the operation mode of the liquid storage module according to the current power and the comparison power interval includes: When it is determined that the current power belongs to the first liquid discharge power interval, determining that the operation mode of the liquid storage module is a rapid refrigerant discharge mode; When it is determined that the current power belongs to the second liquid discharge power interval, the operation mode of the liquid storage module is determined to be a flexible refrigerant discharge mode.

9. The method according to claim 8, characterized in that According to the operation mode, adjusting the switch states of the liquid inlet valve, the gas balance valve, and the liquid discharge valve connected to the liquid storage module includes: When the operation mode of the liquid storage module is the rapid refrigerant discharge mode, the liquid inlet valve connected to the liquid storage module is controlled to be closed, the gas balance valve is opened, and the liquid discharge valve is opened; When the operation mode of the liquid storage module is the flexible refrigerant discharge mode, the liquid inlet valve connected to the liquid storage module is controlled to be closed, the gas balance valve is controlled to be closed, and the liquid discharge valve is controlled to be opened.

10. The method according to claim 7, characterized in that The determining the comparison power interval corresponding to the initial operation mode includes: When the initial operation mode is a refrigerant storage mode, the comparison power interval corresponding to the initial operation mode includes a first liquid storage power interval and a second liquid storage power interval; the power of the first liquid storage power interval is less than the power of the second liquid storage power interval, and the power of the first liquid storage power interval is greater than the target power; The step of determining the operation mode of the liquid storage module according to the current power and the comparison power interval includes: When it is determined that the current power belongs to the first liquid storage power interval, determining that the operation mode of the liquid storage module is a flexible refrigerant storage mode; When it is determined that the current power belongs to the second liquid storage power interval, the operation mode of the liquid storage module is determined to be a rapid refrigerant storage mode.

11. The method according to claim 10, characterized in that According to the operation mode, adjusting the switch states of the liquid inlet valve, the gas balance valve, and the liquid discharge valve connected to the liquid storage module includes: When the operation mode of the liquid storage module is the flexible refrigerant storage mode, the liquid inlet valve connected to the liquid storage module is controlled to be opened, the gas balance valve is closed, and the liquid discharge valve is closed; When the operation mode of the liquid storage module is the rapid refrigerant storage mode, the liquid inlet valve connected to the liquid storage module is controlled to be opened, the gas balance valve is controlled to be opened, and the liquid discharge valve is controlled to be closed.

12. The method according to claim 8 or 10, characterized in that: Each of the comparison power intervals includes a plurality of sub-power intervals, and each of the sub-power intervals corresponds to an operating time; wherein the operating time is positively correlated with the absolute value of the difference corresponding to the sub-power interval, and the absolute value of the difference is the absolute value of the difference between any power value in the sub-power interval and the target power; After determining the operation mode of the liquid storage module according to the current power and the comparison power interval, the method further includes: Determine a target sub-power interval to which the current power belongs; Determine the operating time corresponding to the target sub-power interval as the target time; After adjusting the switch states of the liquid inlet valve, the gas balance valve, and the liquid discharge valve connected to the liquid storage module according to the operation mode, the method further includes: Maintain the liquid storage module to operate in the current operating state for the target time period.

13. A control device for a refrigerant circulation system, characterized in that: Applicable to the refrigerant circulation system according to any one of claims 1 to 3, the device comprising: An acquisition module, used to acquire a set of parameters involved in the operation of a refrigerant circulation subsystem in the refrigerant circulation system; A first determination module, configured to determine the current energy efficiency and current power of the refrigerant circulation subsystem according to the parameter set, and predict the target energy efficiency and target power to be achieved; A second determination module, configured to determine an operation mode of the liquid storage module according to the current energy efficiency, the target energy efficiency, the current power, and the target power; The regulating module is used to regulate the switch states of the liquid inlet valve, the gas balance valve, and the liquid discharge valve connected to the liquid storage module according to the operating mode.

14. An electronic device, characterized in that: include: A processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other via the communication bus; The memory is used to store computer programs; the processor is used to implement the control method of the refrigerant circulation system according to any one of claims 4 to 12 when executing the computer program.

15. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the control method of the refrigerant circulation system according to any one of claims 4 to 12 is implemented.

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