Air conditioning system and control method thereof

Abstract

The application discloses an air conditioning system and a control method thereof. The air conditioning system comprises a first temperature regulating circuit, a second temperature regulating circuit, a connecting pipeline and at least one electrically-controlled valve in the connecting pipeline; the first temperature regulating circuit and the second temperature regulating circuit are connected through the connecting pipeline; the air conditioning system comprises a basic temperature regulating mode and a strengthened temperature regulating mode; in the basic temperature regulating mode, the electrically-controlled valve is closed, the first temperature regulating circuit is disconnected from the second temperature regulating circuit, and temperature regulation is performed only by using the first temperature regulating circuit; in the strengthened temperature regulating mode, the electrically-controlled valve is opened, the first temperature regulating circuit is communicated with the second temperature regulating circuit, and temperature regulation is performed by using the first temperature regulating circuit and the second temperature regulating circuit. In this way, the air conditioning system can execute corresponding temperature regulating modes according to actual requirements, ensures the energy-saving and emission-reducing effect of the air conditioning system, avoids the attenuation of the air conditioning temperature regulating capacity under abnormal weather, guarantees the temperature regulating stability of the air conditioning system and improves the temperature regulating performance of the air conditioning system.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and in particular to an air conditioning system and its control method. Background Technology

[0002] Air conditioners, as important electrical appliances, have gradually entered thousands of households and are used by everyone. Air conditioners mainly perform cooling and heating functions. At present, in high-temperature environments in summer (such as outdoor temperature above 35℃) and cold environments in winter (such as 7℃ and below), the cooling and heating capacity of some air conditioners will decrease to varying degrees, and they will not be able to meet the actual temperature adjustment needs of users. Summary of the Invention

[0003] In view of this, the present invention provides an air conditioning system and its control method to ensure the stability of the air conditioning system's temperature regulation and improve the temperature regulation capability of the air conditioning system.

[0004] In a first aspect, embodiments of the present invention provide an air conditioning system, including a first temperature control circuit, a second temperature control circuit, a connecting pipe, and at least one electrically controlled valve located in the connecting pipe;

[0005] The first temperature control circuit and the second temperature control circuit are connected through the connecting pipe;

[0006] The air conditioning system includes a basic temperature control mode and an enhanced temperature control mode. In the basic temperature control mode, the electronically controlled valve is closed, the first temperature control circuit is disconnected from the second temperature control circuit, and temperature control is performed using only the first temperature control circuit. In the enhanced temperature control mode, the electronically controlled valve is open, the first temperature control circuit is connected to the second temperature control circuit, and temperature control is performed using both the first and second temperature control circuits.

[0007] Secondly, embodiments of the present invention also provide a control method for an air conditioning system, used to control the air conditioning system provided in the embodiments of the present invention, the control method comprising:

[0008] Determine the target temperature control mode of the air conditioning system;

[0009] When the target temperature control mode is the basic temperature control mode, the control valve is closed, the first temperature control circuit and the second temperature control circuit are disconnected, and only the first temperature control circuit is used for temperature control; when the target temperature control mode is the enhanced temperature control mode, the control valve is opened, the first temperature control circuit and the second temperature control circuit are connected, and the first temperature control circuit and the second temperature control circuit are used for temperature control.

[0010] In this invention, the air conditioning system includes a first temperature control circuit, a second temperature control circuit, a connecting pipe, and at least one electrically controlled valve located in the connecting pipe. The first and second temperature control circuits are connected via the connecting pipe. The air conditioning system includes a basic temperature control mode and an enhanced temperature control mode. In the basic temperature control mode, the electrically controlled valve is closed, the first and second temperature control circuits are disconnected, and only the first temperature control circuit is used for temperature control. In the enhanced temperature control mode, the electrically controlled valve is open, the first and second temperature control circuits are connected, and both circuits are used for temperature control. Thus, the air conditioning system can execute the corresponding temperature control mode according to actual needs. When the temperature demand is low, the first temperature control circuit is used for temperature control to ensure energy saving and emission reduction. When the temperature demand is high, both the first and second temperature control circuits are used to control the temperature, avoiding the attenuation of the air conditioning's temperature control capability under abnormal weather conditions, ensuring the temperature control stability of the air conditioning system, and improving the temperature control performance of the air conditioning system. Attached Figure Description

[0011] Figure 1 A schematic diagram of an air conditioning system provided in an embodiment of the present invention;

[0012] Figure 2 and Figure 3 These are schematic diagrams of two other air conditioning systems provided in embodiments of the present invention;

[0013] Figure 4 This is a schematic diagram of another air conditioning system provided in an embodiment of the present invention;

[0014] Figure 5 The control logic diagram is shown for the control method of the air conditioning system provided in the embodiment of the present invention. Detailed Implementation

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0016] Figure 1 This is a schematic diagram of an air conditioning system provided in an embodiment of the present invention, with reference to... Figure 1The air conditioning system includes: a first temperature control circuit 1, a second temperature control circuit 2, a connecting pipe 3, and at least one electrically controlled valve 4 located in the connecting pipe 3; the first temperature control circuit 1 and the second temperature control circuit 2 are connected through the connecting pipe 3; the air conditioning system includes a basic temperature control mode and an enhanced temperature control mode. In the basic temperature control mode, the electrically controlled valve 4 is closed, the first temperature control circuit 1 and the second temperature control circuit 2 are disconnected, and only the first temperature control circuit 1 is used for temperature control; in the enhanced temperature control mode, the electrically controlled valve 4 is opened, the first temperature control circuit 1 and the second temperature control circuit 2 are connected, and the first temperature control circuit 1 and the second temperature control circuit 2 are used for temperature control.

[0017] The basic temperature control mode of the air conditioning system can be executed when the temperature demand is low, while the enhanced temperature control mode can be executed when the temperature demand is high. Low temperature demand refers to the temperature control requirements of the air conditioning system under normal weather conditions (neither too hot nor too cold), while high temperature demand refers to the temperature control requirements of the air conditioning system under abnormal weather conditions (such as excessively hot or excessively cold). For example, the basic temperature control mode can be a normal cooling mode and / or a normal heating mode, while the enhanced temperature control mode can be an enhanced cooling mode and / or an enhanced heating mode. When the cooling (heating) demand is low, the normal cooling mode (or normal heating mode) can be executed; when the cooling (heating) demand is high, the enhanced cooling mode (or enhanced heating mode) can be executed. Low cooling demand can refer to cooling demand when the outdoor ambient temperature is below 35℃ in summer, while high cooling demand can refer to cooling demand when the outdoor ambient temperature is above 35℃ in summer; low heating demand can refer to heating demand when the outdoor ambient temperature is above 7℃ in winter, while high heating demand can refer to heating demand when the outdoor ambient temperature is below 7℃ in winter, but is not limited to these.

[0018] For different temperature control needs, such as Figure 1 As shown, in this invention, a first temperature control circuit 1 and a second temperature control circuit 2 are simultaneously provided in the air conditioning system, and a connecting pipe 3 is provided between them. When the electrically controlled valve 4 in the connecting pipe 3 is opened, the connecting pipe 3 is connected, and at least part of the refrigerant in the first temperature control circuit 1 can flow into the second temperature control circuit 2. The air conditioning system is in the enhanced temperature control mode, and the second temperature control circuit 2 works together with the first temperature control circuit 1 to complete the temperature control work. When the electrically controlled valve 4 in the connecting pipe 3 is closed, the connecting pipe 3 is disconnected, and the refrigerant in the first temperature control circuit 1 cannot flow into the second temperature control circuit 2. The air conditioning system is in the basic temperature control mode, and only the first temperature control circuit 1 completes the temperature control work.

[0019] The first temperature control circuit 1 can be a refrigerant circuit in a conventional air conditioning system, and the second temperature control circuit 2 is an auxiliary refrigerant circuit. The specific structural components in the first temperature control circuit 1 and the second temperature control circuit 2 can be configured by those skilled in the art according to actual needs, and this embodiment of the invention does not elaborate on or limit them. For example, the first temperature control circuit 1 may include components such as a compressor (not shown in the figure), a heat exchanger (not shown in the figure), and a solenoid valve (not shown in the figure), and the second temperature control circuit 2 may include components such as an external temperature control source (not shown in the figure), a heat exchanger (not shown in the figure), and a solenoid valve (not shown in the figure).

[0020] The second temperature control circuit 2 is an additional external temperature control circuit. The structure of the second temperature control circuit 2 can be set relatively simply. By using the second temperature control circuit 2, the temperature control requirements of the air conditioning system under abnormal temperature weather conditions can be met.

[0021] In this invention, the air conditioning system includes a first temperature control circuit, a second temperature control circuit, a connecting pipe, and at least one electrically controlled valve located in the connecting pipe. The first and second temperature control circuits are connected via the connecting pipe. The air conditioning system includes a basic temperature control mode and an enhanced temperature control mode. In the basic temperature control mode, the electrically controlled valve is closed, the first and second temperature control circuits are disconnected, and only the first temperature control circuit is used for temperature control. In the enhanced temperature control mode, the electrically controlled valve is open, the first and second temperature control circuits are connected, and both circuits are used for temperature control. Thus, the air conditioning system can execute the corresponding temperature control mode according to actual needs. When the temperature demand is low, the first temperature control circuit is used for temperature control to ensure energy saving and emission reduction. When the temperature demand is high, both the first and second temperature control circuits are used to control the temperature, avoiding the attenuation of the air conditioning's temperature control capability under abnormal weather conditions, ensuring the temperature control stability of the air conditioning system, and improving the temperature control performance of the air conditioning system.

[0022] Figure 2 and Figure 3 These are schematic diagrams of two other air conditioning systems provided in embodiments of the present invention. Figure 2 and Figure 3 The illustrated embodiment provides two specific structural configurations for the first temperature control circuit 1 and the second temperature control circuit 2, for reference. Figure 2 and Figure 3The first temperature control circuit 1 may include a compressor 10, a four-way valve 11, a first solenoid valve 12, an outdoor heat exchanger 13, a first electronic expansion valve 14, a second solenoid valve 15, a second electronic expansion valve 16, an indoor heat exchanger 17, and a gas-liquid separator 18, all connected to each other. The second temperature control circuit 2 may include an auxiliary temperature control source 20, a temperature control source solenoid valve 21, a water pump 22, and an auxiliary heat exchanger 23, all connected to each other. The connecting pipeline 3 may include a first pipeline 30 and a second pipeline 31. The first pipeline 30 is used to connect the first temperature control circuit 1 and the first flow port 23a of the auxiliary heat exchanger 23, and the second pipeline 31 is used to connect the first temperature control circuit 1 and the second flow port 23b of the auxiliary heat exchanger 23. The electrically controlled valve 4 includes a third electronic expansion valve 40 and a third solenoid valve 41. The third electronic expansion valve 40 is located in the first pipeline 30, and the third solenoid valve 41 is located in the second pipeline 31. In the basic temperature control mode, the third solenoid valve 41 and the third electronic expansion valve 40 are closed, and the refrigerant flows only in the first temperature control circuit 1; in the enhanced temperature control mode, the third solenoid valve 41 and the third electronic expansion valve 40 are open, and the refrigerant flows in the first temperature control circuit 1 and the auxiliary heat exchanger 23.

[0023] Among them, such as Figure 2 or Figure 3 As shown, the outlet of compressor 10 is connected to one port of four-way valve 11. The other three ports of four-way valve 11 are respectively connected to one port of outdoor heat exchanger 13, one port of indoor heat exchanger 17, and the inlet of gas-liquid separator 18. The other port of outdoor heat exchanger 13 is connected to the other port of indoor heat exchanger 17. The first solenoid valve 12 is located in the connection path between four-way valve 11 and outdoor heat exchanger 13. The first electronic expansion valve 14, the second solenoid valve 15, and the second electronic expansion valve 16 are located sequentially in the connection path between outdoor heat exchanger 13 and indoor heat exchanger 17. The outlet of gas-liquid separator 18 is connected to the inlet of compressor 10.

[0024] The number of indoor heat exchangers 17 is unlimited. Figure 2 The diagram shows two indoor heat exchangers 17 and corresponding second electronic expansion valves 16, but the actual configuration is not limited to this. Those skilled in the art can configure one or more indoor heat exchangers 17 and corresponding second electronic expansion valves 16 according to actual application requirements.

[0025] In the second temperature control circuit 2, the auxiliary temperature control source 20, the temperature control source solenoid valve 21, the water pump 22, and the auxiliary heat exchanger 23 are connected in sequence. The auxiliary temperature control source 20 is used to provide coolant. When the water pump 22 and the temperature control source solenoid valve 21 are open, the coolant in the second temperature control circuit 2 can circulate in the second temperature control circuit 2.

[0026] Continue to refer to Figure 2 or Figure 3In addition to the two ports connected to the water pump 22 and the auxiliary temperature control source 20, the auxiliary heat exchanger 23 also includes a first flow port 23a and a second flow port 23b. The first flow port 23a is connected to one end of the first pipe 30, and the second flow port 23b is connected to one end of the second pipe 31. Furthermore, the other end of the first pipe 30 and the other end of the second pipe 31 are respectively connected to different connection nodes of the first temperature control loop 1. A third electronic expansion valve 40 located in the first pipe 30 is used to control the connection and disconnection of the first flow port 23a between the first temperature control loop 1 and the auxiliary heat exchanger 23, and a third solenoid valve 41 located in the second pipe 31 is used to control the connection and disconnection of the second flow port 23b of the first temperature control loop 1.

[0027] When both the third electronic expansion valve 40 and the third solenoid valve 41 are closed, the first temperature control circuit 1 is not connected to the auxiliary heat exchanger 23, and the refrigerant in the first temperature control circuit 1 will not enter the auxiliary heat exchanger 23. When both the third electronic expansion valve 40 and the third solenoid valve 41 are open, the first temperature control circuit 1 is connected to the auxiliary heat exchanger 23, and some of the refrigerant in the first temperature control circuit 1 can enter the auxiliary heat exchanger 23. After exchanging heat with the circulating coolant in the second temperature control circuit 2 at the auxiliary heat exchanger 23, it flows back into the first temperature control circuit 1, thereby improving the temperature control effect of the refrigerant in the first temperature control circuit 1 and completing the joint temperature control work of the first temperature control circuit 1 and the second temperature control circuit 2.

[0028] In this embodiment, the first temperature control circuit 1 and the second temperature control circuit 2 are connected by the first pipe 30, the second pipe 31, the third electronic expansion valve 40, and the third solenoid valve 41. By controlling the working state of the third electronic expansion valve 40 and the third solenoid valve 41, the switching of different temperature control modes can be realized. The pipe design and control logic are relatively simple, and the reliability of the air conditioning system can be guaranteed.

[0029] Optionally, the second temperature control circuit 2 may also include a flow regulating valve 24, which may be located between the water pump 22 and the auxiliary heat exchanger 23 to regulate the flow rate of the coolant.

[0030] Among them, the auxiliary temperature source 20 is an external temperature source. It is worth mentioning that, as a preferred embodiment, the auxiliary temperature source 20 can be one or more of the following: industrial waste cold source, industrial waste heat source, solar energy cold source, solar energy heat source, biomass energy heat source, biomass energy cold source, and geothermal energy.

[0031] The aforementioned industrial waste cold and heat sources are industrial waste energy sources. Solar energy for cold and heat generation, biomass energy for heat and cold generation, and geothermal energy are all renewable and clean energy sources. Utilizing these energy sources as auxiliary temperature control sources 20 can achieve the rational utilization of waste and clean energy. For example, the auxiliary temperature control source 20 can be groundwater, which can be drawn out and connected to the second refrigerant circuit. The specific connection method can be designed by those skilled in the art according to actual needs, and this invention does not elaborate on or limit it.

[0032] Furthermore, the location of the connection node between the first pipeline 30 and the second pipeline 31 and the first temperature control circuit 1 is not limited in this embodiment of the invention, and can be set according to actual needs. Several optional setting methods are introduced below.

[0033] For example, please refer to... Figure 2 or Figure 3 In a possible embodiment, one end of the first conduit 30 is located in the communication path between the second solenoid valve 15 and the second electronic expansion valve 16, and the other end of the first conduit 30 is connected to the first flow port 23a. One end of the second conduit 31 is located in the communication path between the first electronic expansion valve 14 and the second solenoid valve 15, and the other end of the second conduit 31 is connected to the second flow port 23b; or, one end of the second conduit 31 is located in the communication path between the four-way valve 11 and the gas-liquid separator 18, and the other end of the second conduit 31 is connected to the second flow port 23b.

[0034] A first connecting node A can be set between the connecting paths of the second solenoid valve 15 and the second electronic expansion valve 16. One end of the first pipeline 30 is connected to the first connecting node A, and the other end is connected to the first flow port 23a of the auxiliary heat exchanger 23.

[0035] Regarding the connection position of the second pipe 31, the present invention proposes two optional solutions. The first solution is to set the connection node between the second pipe 31 and the first temperature control circuit 1 in the connection path between the first electronic expansion valve 14 and the second solenoid valve 15, such as... Figure 2 As shown; the second method is to set the connection point between the second pipeline 31 and the first temperature control circuit 1 in the connection path between the four-way valve 11 and the gas-liquid separator 18, as shown. Figure 3 As shown.

[0036] The two schemes mentioned above correspond to different basic temperature control and enhanced temperature control modes. Under the first scheme, the basic temperature control mode includes the normal cooling mode, and the enhanced temperature control mode includes the enhanced cooling mode.

[0037] refer to Figure 2In normal cooling mode, the four-way valve 11 is in the cooling indicator position, with the first port 11a and the second port 11b connected, and the third port 11c and the fourth port 11d connected. Simultaneously, the first solenoid valve 12, the first electronic expansion valve 14, the second solenoid valve 15, and the second electronic expansion valve 16 are open, while the third electronic expansion valve 40, the third solenoid valve 41, the temperature control source solenoid valve 21, and the water pump 22 are closed. The refrigerant is compressed by the compressor 10 into a high-temperature, high-pressure gaseous refrigerant. After passing through the four-way valve 11, it enters the outdoor heat exchanger 13 and condenses into a high-temperature, high-pressure liquid refrigerant. Then, it passes through the second electronic expansion valve 16, which throttles it into a low-temperature, low-pressure gas-liquid two-phase refrigerant. This liquid refrigerant then exchanges heat with the indoor air in the indoor heat exchanger 17, evaporating into a low-temperature, low-pressure gaseous refrigerant. Finally, the refrigerant flows through the four-way valve 11 into the gas-liquid separator 18, where it is separated into gaseous and liquid refrigerants. The gaseous refrigerant returns to the compressor 10 for recirculation.

[0038] In enhanced cooling mode, the four-way valve 11 is also in the cooling indicator position. The first port 11a and the second port 11b of the four-way valve 11 are connected, and the third port 11c and the fourth port 11d are connected. At the same time, the first solenoid valve 12, the first electronic expansion valve 14, the second electronic expansion valve 16, the third electronic expansion valve 40, the third solenoid valve 41, the temperature control source solenoid valve 21 and the water pump 22 are open, and the second solenoid valve 15 is closed. At this time, the refrigerant is compressed by the compressor 10 into a high-temperature, high-pressure gaseous refrigerant. After passing through the four-way valve 11, it enters the outdoor heat exchanger 13 and condenses into a high-temperature, high-pressure liquid refrigerant. Then, it flows into the second pipeline 31 and enters the auxiliary heat exchanger 23 through the third solenoid valve 41 to cool the high-temperature, high-pressure liquid refrigerant into a medium-temperature, high-pressure liquid refrigerant, increasing the subcooling of the refrigerant. Then, it returns to the first temperature control circuit 1 through the first pipeline 30 and enters the second electronic expansion valve 16 to be throttled into a low-temperature, low-pressure gas-liquid two-phase refrigerant. It then exchanges heat with the indoor air in the indoor heat exchanger 17 and evaporates into a low-temperature, low-pressure gaseous refrigerant. Then, the refrigerant flows into the gas-liquid separator 18 through the four-way valve 11, where it is separated into gaseous and liquid states. The gaseous refrigerant returns to the compressor 10 and is recirculated.

[0039] Correspondingly, in the second setting mode, the basic temperature control mode includes the normal heating mode, and the enhanced temperature control mode includes the enhanced heating mode.

[0040] refer to Figure 3In normal heating mode, the four-way valve 11 is in the heating position, the first port 11a and the fourth port 11d of the four-way valve 11 are connected, and the second port 11b and the third port 11c are connected; at the same time, the first solenoid valve 12, the first electronic expansion valve 14, the second solenoid valve 15 and the second electronic expansion valve 16 are open, and the third electronic expansion valve 40, the third solenoid valve 41, the temperature control source solenoid valve 21 and the water pump 22 are closed. At this time, the refrigerant is compressed by the compressor 10 into a high-temperature and high-pressure gaseous refrigerant. After passing through the four-way valve 11, it enters the indoor heat exchanger 17 and condenses into a high-temperature and high-pressure liquid refrigerant. Then, it is throttled by the second electronic expansion valve 16 and the first electronic expansion valve 14 into a low-temperature and low-pressure gas-liquid two-phase refrigerant. It then exchanges heat with the outdoor air in the outdoor heat exchanger 13 and evaporates into a low-temperature and low-pressure gaseous refrigerant. The refrigerant then flows into the gas-liquid separator 18 through the four-way valve 11, where it is separated into gaseous and liquid states. The gaseous refrigerant returns to the compressor 10 to recycle.

[0041] In enhanced heating mode, the four-way valve 11 is also in the heating indicator position. The first port 11a and the fourth port 11d of the four-way valve 11 are connected, and the second port 11b and the third port 11c are connected. At the same time, the first solenoid valve 12, the first electronic expansion valve 14, the second solenoid valve 15, the second electronic expansion valve 16, the third electronic expansion valve 40, the third solenoid valve 41, the temperature control source solenoid valve 21, and the water pump 22 are turned on. At this time, the refrigerant is compressed by the compressor 10 into a high-temperature, high-pressure gaseous refrigerant, which then enters the indoor heat exchanger 17 through the four-way valve 11 and condenses into a high-temperature, high-pressure liquid refrigerant. At the first connecting node A, the refrigerant is divided into two paths. One path is throttled by the first electronic expansion valve 14 into a low-temperature, low-pressure gas-liquid two-phase refrigerant, which exchanges heat with the outdoor air in the outdoor heat exchanger 13 and evaporates into a low-temperature, low-pressure gaseous refrigerant. Then, it flows into the gas-liquid separator 18 through the four-way valve 11. The other path of refrigerant flows into the first pipeline 30, is throttled by the third electronic expansion valve 40 into a low-temperature, low-pressure gas-liquid two-phase refrigerant, and exchanges heat with the coolant in the second temperature control circuit 2 in the auxiliary heat exchanger 23, evaporating into a low-temperature, low-pressure gaseous refrigerant. Then, it flows into the gas-liquid separator 18 through the second pipeline 31. Subsequently, the two paths of refrigerant merge and separate into gaseous and liquid states in the gas-liquid separator 18, and the gaseous refrigerant returns to the compressor 10 to recirculate.

[0042] In the first configuration described above, the air conditioning system can switch between normal cooling mode and enhanced cooling mode to meet different cooling needs, and its auxiliary temperature source 20 can be an external cold source. In the second configuration, the air conditioning system can switch between normal heating mode and enhanced heating mode to meet different heating needs, and its auxiliary temperature source 20 can be an external heat source.

[0043] Figure 4This is a schematic diagram of another air conditioning system provided in an embodiment of the present invention, with reference to... Figure 4 In a possible embodiment, the first temperature control circuit 1 may further include a first connecting node A, a second connecting node B, and a third connecting node C. The first connecting node A is located between the second solenoid valve 15 and the second electronic expansion valve 16, the second connecting node B is located between the first electronic expansion valve 14 and the second solenoid valve 15, and the third connecting node C is located between the four-way valve 11 and the gas-liquid separator 18. The first pipeline 30 is used to connect the first connecting node A and the first flow port 23a; the second pipeline 31 includes a first sub-pipeline 310 and a second sub-pipeline 311. The first sub-pipeline 310 is used to connect the second connecting node B and the second flow port 23b, and the second sub-pipeline 311 is used to connect the third connecting node C and the second flow port 23b. The third solenoid valve 41 includes a first sub-solenoid valve 410 and a second sub-solenoid valve 411. The first sub-solenoid valve 410 is located in the first sub-pipeline 310, and the second sub-solenoid valve 411 is located in the second sub-pipeline 311.

[0044] The arrangement of the first connecting node A and the first pipeline 30 is the same as in the above embodiment. The difference is that in this embodiment, the second pipeline 31 is composed of a first sub-pipeline 310 and a second sub-pipeline 311. One end of the first sub-pipeline 310 is connected to the second connecting node B, and the other end is connected to the second flow port 23b of the auxiliary heat exchanger 23. One end of the second sub-pipeline 311 is connected to the third connecting node C, and the other end can be connected to the side of the first sub-pipeline 310 near the second flow port 23b of the auxiliary heat exchanger 23.

[0045] Correspondingly, there can be two third solenoid valves 41, named the first sub-solenoid valve 410 and the second sub-solenoid valve 411 respectively. The first sub-solenoid valve 410 is used to control the connection and disconnection of the second connecting node B and the auxiliary heat exchanger 23, and the second sub-solenoid valve 411 is used to control the connection and disconnection of the third connecting node C and the auxiliary heat exchanger 23.

[0046] In this configuration, the second pipe 31 connects the second flow port 23b of the auxiliary heat exchanger 23 to the two connecting nodes of the first temperature control circuit 1, enabling the air conditioning system to perform the above-mentioned functions. Figure 2 and Figure 3 The normal cooling, enhanced cooling, normal heating, and enhanced heating modes in the illustrated embodiment are switched between heating and cooling modes by controlling the state of the first sub-solenoid valve 410 and the second sub-solenoid valve 411.

[0047] Specifically, in normal cooling mode, the four-way valve 11 is in the cooling indicator position, with the first port 11a and the second port 11b connected, and the third port 11c and the fourth port 11d connected. Simultaneously, the first solenoid valve 12, the first electronic expansion valve 14, the second solenoid valve 15, and the second electronic expansion valve 16 are open, while the third electronic expansion valve 40, the first sub-solenoid valve 410, the second sub-solenoid valve 411, the temperature control source solenoid valve 21, and the water pump 22 are closed. In enhanced cooling mode, the four-way valve 11 is in the cooling indicator position, and simultaneously, the first solenoid valve 12, the first electronic expansion valve 14, the second electronic expansion valve 16, the third electronic expansion valve 40, the first sub-solenoid valve 410, the temperature control source solenoid valve 21, and the water pump 22 are open, while the second solenoid valve 15 and the second sub-solenoid valve 411 are closed.

[0048] In normal heating mode, the four-way valve 11 is in the heating position, with its first port 11a and fourth port 11d connected, and its second port 11b and third port 11c connected. Simultaneously, the first solenoid valve 12, the first electronic expansion valve 14, the second solenoid valve 15, and the second electronic expansion valve 16 are open, while the third electronic expansion valve 40, the first sub-solenoid valve 410, the second sub-solenoid valve 411, the temperature control source solenoid valve 21, and the water pump 22 are closed. In enhanced heating mode, the four-way valve 11 is in the heating position, and simultaneously, the first solenoid valve 12, the first electronic expansion valve 14, the second solenoid valve 15, the second electronic expansion valve 16, the third electronic expansion valve 40, the second sub-solenoid valve 411, the temperature control source solenoid valve 21, and the water pump 22 are open, while the first sub-solenoid valve 410 is closed.

[0049] In the above-mentioned normal refrigeration mode and normal refrigeration mode, the refrigerant flow method is the same as in the above embodiments, and will not be repeated here. In the enhanced refrigeration mode, the refrigerant is compressed by the compressor 10 into a high-temperature and high-pressure gaseous refrigerant, which enters the outdoor heat exchanger 13 after passing through the four-way valve 11 and condenses into a high-temperature and high-pressure liquid refrigerant. Then it flows into the first sub-pipe 310, enters the auxiliary heat exchanger 23 through the first sub-solenoid valve 410 to cool the high-temperature and high-pressure liquid refrigerant into a medium-temperature and high-pressure liquid refrigerant, increasing the subcooling of the refrigerant; then it returns to the first temperature control circuit 1 through the first pipe 30, enters the second electronic expansion valve 16 to be throttled into a low-temperature and low-pressure gas-liquid two-phase refrigerant, and exchanges heat with the indoor air in the indoor heat exchanger 17, evaporating into a low-temperature and low-pressure gaseous refrigerant. Then the refrigerant flows into the gas-liquid separator 18 through the four-way valve 11, where it is separated into gaseous and liquid states. The gaseous refrigerant returns to the compressor 10 and is recirculated.

[0050] In enhanced heating mode, the refrigerant is compressed by compressor 10 into a high-temperature, high-pressure gaseous refrigerant, which then enters the indoor heat exchanger 17 through four-way valve 11 and condenses into a high-temperature, high-pressure liquid refrigerant. At the first connecting node A, the refrigerant is divided into two paths. One path is throttled by the first electronic expansion valve 14 into a low-temperature, low-pressure gas-liquid two-phase refrigerant, which exchanges heat with the outdoor air in the outdoor heat exchanger 13, evaporating into a low-temperature, low-pressure gaseous refrigerant, and then flows into the gas-liquid separator 18 through four-way valve 11. Another refrigerant flows into the first pipeline 30, is throttled by the third electronic expansion valve 40 into a low-temperature, low-pressure gas-liquid two-phase refrigerant, and exchanges heat with the coolant in the second temperature control circuit 2 in the auxiliary heat exchanger 23, evaporating into a low-temperature, low-pressure gaseous refrigerant, and then flows into the gas-liquid separator 18 through part of the first sub-pipeline 310 and the second sub-pipeline 311; subsequently, the two refrigerants merge and separate into gaseous and liquid states in the gas-liquid separator 18, and the gaseous refrigerant returns to the compressor 10 for recirculation.

[0051] use Figure 4 The setup shown allows the air conditioning system to meet the needs of more usage scenarios and achieve more temperature control requirements.

[0052] Optional, you can continue to refer to Figure 4 In a possible embodiment, the air conditioning system may further include a first refrigerant line 5, a second refrigerant line 6, a fourth solenoid valve 7, and a fifth solenoid valve 8; one end of the first refrigerant line 5 is connected to the outlet of the compressor 10, and the other end of the first refrigerant line 5 is located in the communication path between the outdoor heat exchanger 13 and the first electronic expansion valve 14, and the fourth solenoid valve 7 is located in the first refrigerant line 5; one end of the second refrigerant line 6 is connected to the first communication node A, and the other end of the second refrigerant line 6 is located in the communication path between the first solenoid valve 12 and the outdoor heat exchanger 13, and the fifth solenoid valve 8 is located in the second refrigerant line 6.

[0053] Specifically, such as Figure 4As shown, taking the refrigerant flow direction in heating mode as the reference direction, the first refrigerant line 5 connects the outlet of the compressor 10 to the upstream line of the outdoor heat exchanger 13 (or the downstream line of the first electronic expansion valve 14). When the fourth solenoid valve 7 is closed, the outlet of the compressor 10 is disconnected from the upstream line of the outdoor heat exchanger 13 (or the downstream line of the first electronic expansion valve 14); when the fourth solenoid valve 7 is open, the outlet of the compressor 10 is connected to the upstream line of the outdoor heat exchanger 13. The second refrigerant line 6 connects the downstream line of the outdoor heat exchanger 13 (or the upstream line of the first solenoid valve 12) to the first connecting node A of the first temperature control circuit 1. When the fifth solenoid valve 8 is closed, the downstream line of the outdoor heat exchanger 13 (or the upstream line of the first solenoid valve 12) is disconnected from the first connecting node A; when the fifth solenoid valve 8 is open, the downstream line of the outdoor heat exchanger 13 (or the upstream line of the first solenoid valve 12) is connected to the first connecting node A.

[0054] The newly added first refrigerant line 5, second refrigerant line 6, fourth solenoid valve 7, and fifth solenoid valve 8 enable the air conditioning system to have a defrost mode. In defrost mode, the four-way valve 11 is in the heating position, and at the same time, the second electronic expansion valve 16, the third electronic expansion valve 40, the second sub-solenoid valve 411, the fourth solenoid valve 7, the fifth solenoid valve 8, the temperature control source solenoid valve 21, and the water pump 22 are open, while the first solenoid valve 12, the first electronic expansion valve 14, the second solenoid valve 15, and the first sub-solenoid valve 410 are closed. At this time, the refrigerant is compressed by the compressor 10 into a high-temperature, high-pressure gaseous refrigerant. Then, the refrigerant is divided into two paths. One path passes through the four-way valve 11 and enters the indoor heat exchanger 17, where it condenses into a high-temperature, high-pressure liquid refrigerant. The other path passes through the fourth solenoid valve 7 and enters the outdoor heat exchanger 13, where, during defrosting, the refrigerant condenses into a medium-temperature, high-pressure liquid refrigerant. Afterward, the two refrigerant paths converge at the first connecting node A and simultaneously enter the first pipeline 30 and pass through the third electronic expansion valve 40, where they are throttled into a low-temperature, low-pressure gas-liquid two-phase refrigerant. Subsequently, in the auxiliary heat exchanger 23, it exchanges heat with the coolant in the second temperature control circuit 2, evaporating into a low-temperature, low-pressure gaseous refrigerant. Then, it flows through part of the first sub-pipeline 310 and the second pipeline 31 into the gas-liquid separator 18, where it is separated into gaseous and liquid states. The gaseous refrigerant returns to the compressor 10 for recirculation.

[0055] In this embodiment, when the air conditioning system performs the heating and defrosting function in winter, it can simultaneously deliver heat to the indoor environment to maintain the indoor temperature, thus solving the problem of room temperature drop during defrosting mode in the prior art.

[0056] Optionally, based on the above embodiments, the air conditioning system of the present invention may further include a temperature control mode determination module (not shown in the accompanying drawings), which may be integrated into the control device of the air conditioning system. The temperature control mode determination module is used to obtain the current center plate temperature of the indoor heat exchanger and the current outdoor ambient temperature, and determine the target temperature control mode based on the relationship between the current center plate temperature and the center plate temperature threshold, and the relationship between the current outdoor ambient temperature and the outdoor ambient temperature threshold.

[0057] Specifically, a center plate temperature sensor (not shown in the attached diagram) is installed on the center plate of the indoor heat exchanger to detect the current center plate temperature. The air conditioning system may also be equipped with an outdoor ambient temperature sensor (not shown in the attached diagram) to detect the current outdoor ambient temperature. The temperature control mode determination module may include a temperature acquisition module and a temperature control mode determination unit. The temperature acquisition module is used to acquire the current center plate temperature of the indoor heat exchanger and the current outdoor ambient temperature based on the temperature sensor. The temperature control mode determination unit is used to determine the target temperature control mode based on the relationship between the current center plate temperature and the center plate temperature threshold, and the relationship between the current outdoor ambient temperature and the outdoor ambient temperature threshold.

[0058] Optionally, the temperature control mode determination module may further include an operation mode determination unit for determining the operation mode of the air conditioning system. The operation mode includes at least a cooling operation mode, a dehumidification operation mode, and a heating operation mode. Specifically, the temperature control mode determination unit can be used to determine the target temperature control mode as normal cooling mode when the air conditioning system is in cooling or dehumidification operation mode, and the current center plate temperature is greater than or equal to a first center plate temperature threshold and remains at a first time threshold, and the current outdoor ambient temperature is less than a first outdoor ambient temperature threshold; and when the air conditioning system is in cooling or dehumidification operation mode, and the current center plate temperature is greater than or equal to the first center plate temperature threshold and remains at a first time threshold, and the current outdoor ambient temperature is greater than or equal to the first outdoor ambient temperature threshold and remains at a second time threshold, the target temperature control mode is determined as enhanced cooling mode.

[0059] Optionally, in other possible embodiments, the temperature control mode determination unit can also be used to determine the target temperature control mode as normal heating mode when the air conditioning system is in heating operation mode, and the current center plate temperature is less than or equal to the second center plate temperature threshold and continues for a third time threshold, and the current outdoor ambient temperature is greater than the second outdoor ambient temperature threshold; and to determine the target temperature control mode as enhanced heating mode when the air conditioning system is in heating operation mode, and the current center plate temperature is less than or equal to the second center plate temperature threshold and continues for a third time threshold, and the current outdoor ambient temperature is less than or equal to the second outdoor ambient temperature threshold and continues for a fourth time threshold.

[0060] Optionally, in possible embodiments, the air conditioning system may also include a heat exchanger surface temperature sensor (not shown in the figures) for collecting the current surface temperature of the outdoor heat exchanger. The heat exchanger surface temperature sensor may be electrically connected to the temperature control mode determination module. The temperature control mode determination module may also be used to determine whether the air conditioning system meets the defrosting conditions after it enters the normal heating mode or the enhanced heating mode. If the defrosting conditions are met, the control module controls the air conditioning to enter the defrosting mode.

[0061] Based on the same concept, embodiments of the present invention also provide a control method for an air conditioning system, used to control the air conditioning system provided in any embodiment of the present invention. This control method can be executed by a control device within the air conditioning system, which can be composed of software and / or hardware. A structural diagram of the air conditioning system can be referenced. Figure 1 The control method includes:

[0062] S110. Determine the target temperature control mode for the air conditioning system.

[0063] The target temperature control mode may include a basic temperature control mode and an enhanced temperature control mode. The basic temperature control mode may include a normal cooling mode and a normal heating mode, while the enhanced temperature control mode may include an enhanced cooling mode and an enhanced heating mode. The distinction between the basic temperature control mode and the enhanced temperature control mode can be referred to the corresponding embodiment of the air conditioning system described above, and will not be described in detail here.

[0064] The target temperature control mode can be determined based on the current outdoor temperature and the temperature of the middle plate of the indoor heat exchanger, but is not limited to this.

[0065] S120. When the target temperature control mode is the basic temperature control mode, the control valve is closed, the first temperature control circuit and the second temperature control circuit are disconnected, and only the first temperature control circuit is used for temperature control; when the target temperature control mode is the enhanced temperature control mode, the control valve is opened, the first temperature control circuit and the second temperature control circuit are connected, and the first temperature control circuit and the second temperature control circuit are used for temperature control.

[0066] If the target temperature control mode is determined to be the basic temperature control mode, the electronically controlled valve in the connecting pipeline can be closed, the connecting pipeline can be disconnected, and the refrigerant in the first temperature control circuit cannot flow into the second temperature control circuit. The temperature control work is completed only by the first temperature control circuit. If the target temperature control mode is determined to be the enhanced temperature control mode, the solenoid valve in the connecting pipeline can be opened, the connecting pipeline can be connected, and at least part of the refrigerant in the first temperature control circuit can flow into the second temperature control circuit. The second temperature control circuit works together with the first temperature control circuit to complete the temperature control work.

[0067] The air conditioning system control method provided in this embodiment of the invention allows the air conditioning system to execute a corresponding target temperature regulation mode according to actual needs. When the temperature regulation demand is low, the first temperature regulation loop is used for temperature regulation to ensure energy saving and emission reduction. When the temperature regulation demand is high, the first temperature regulation loop and the second temperature regulation loop are used for temperature regulation to avoid the attenuation of the air conditioning temperature regulation capability under abnormal weather conditions, ensure the temperature regulation stability of the air conditioning system, and improve the temperature regulation performance of the air conditioning system.

[0068] The air conditioning system control method provided in this invention includes all the technical features and corresponding beneficial effects of the air conditioning system provided in any embodiment of this invention. The following supplementary descriptions of contents not detailed in the above air conditioning system embodiments are provided using several optional embodiments. Contents already described in the above embodiments will not be elaborated upon further.

[0069] Optional, you can continue to refer to Figure 2 or Figure 3 The first temperature control circuit 1 may include a compressor 10, a four-way valve 11, a first solenoid valve 12, an outdoor heat exchanger 13, a first electronic expansion valve 14, a second solenoid valve 15, a second electronic expansion valve 16, an indoor heat exchanger 17, and a gas-liquid separator 18 connected in sequence; the second temperature control circuit 2 includes an auxiliary temperature control source 20, a temperature control source solenoid valve 21, a water pump 22, and an auxiliary heat exchanger 23 connected in sequence; the connecting pipeline 3 includes a first pipeline 30 and a second pipeline 31, the first pipeline 30 being used to connect the first temperature control circuit 1 and the first flow port 23a of the auxiliary heat exchanger 23, and the second pipeline 31 being used to connect the first temperature control circuit 1 and the second flow port 23b of the auxiliary heat exchanger 23; the electrically controlled valve 4 includes a third electronic expansion valve 40 and a third solenoid valve 41, the third electronic expansion valve 40 being located in the first pipeline 30, and the third solenoid valve 41 being located in the second pipeline 31. The air conditioning system also includes a temperature control mode determination module (not shown in the figure), which can be integrated into the control device of the air conditioning system (not shown in the figure).

[0070] In the above embodiment, S110 can be further refined as follows: S211, obtaining the current middle plate temperature of the indoor heat exchanger and the current outdoor ambient temperature, and S212, determining the target temperature control mode based on the relationship between the current middle plate temperature and the middle plate temperature threshold and the relationship between the current outdoor ambient temperature and the outdoor ambient temperature threshold.

[0071] S120 can be further refined as follows: S220, when the target temperature control mode is the basic temperature control mode, the third solenoid valve and the third electronic expansion valve are closed, so that the refrigerant flows only in the first temperature control circuit; when the target temperature control mode is the enhanced temperature control mode, the third solenoid valve and the third electronic expansion valve are opened, so that the refrigerant flows in the first temperature control circuit and the auxiliary heat exchanger.

[0072] Specifically, a center plate temperature sensor (not shown in the attached diagram) is installed on the center plate of the indoor heat exchanger to detect the current center plate temperature. The air conditioning system may also be equipped with an outdoor ambient temperature sensor (not shown in the attached diagram) to detect the current outdoor ambient temperature. The temperature control mode determination module may include a temperature acquisition module and a temperature control mode determination unit. The temperature acquisition module is used to acquire the current center plate temperature of the indoor heat exchanger and the current outdoor ambient temperature based on the temperature sensor. The temperature control mode determination unit is used to determine the target temperature control mode based on the relationship between the current center plate temperature and the center plate temperature threshold, and the relationship between the current outdoor ambient temperature and the outdoor ambient temperature threshold.

[0073] refer to Figure 2 or Figure 3 If the target temperature control mode is the basic temperature control mode, then the third solenoid valve 41 and the third electronic expansion valve 40 are closed, the first temperature control loop 1 is not connected to the auxiliary heat exchanger 23, and the refrigerant in the first temperature control loop 1 will not enter the auxiliary heat exchanger 23. If the target temperature control mode is the enhanced temperature control mode, then both the third electronic expansion valve 40 and the third solenoid valve 41 are opened, the first temperature control loop 1 is connected to the auxiliary heat exchanger 23, and some of the refrigerant in the first temperature control loop 1 can enter the auxiliary heat exchanger 23. After exchanging heat with the circulating coolant in the second temperature control loop 2 at the auxiliary heat exchanger 23, it flows back into the first temperature control loop 1, thereby improving the temperature control effect of the refrigerant in the first temperature control loop 1. Furthermore, the switching between different temperature control modes is achieved by controlling the working state of the third electronic expansion valve 40 and the third solenoid valve 41.

[0074] Optionally, the present invention does not limit the method for determining the target temperature control mode, and those skilled in the art can set it according to actual needs.

[0075] For example, taking the basic temperature control mode as including the normal cooling mode and the enhanced temperature control mode as including the enhanced cooling mode as an example, in an optional embodiment, before executing S211 in the above embodiment, the following can also be executed: S301, determining the operating mode of the air conditioning system; the operating mode includes at least the cooling operating mode, the dehumidification operating mode and the heating operating mode.

[0076] S212 can be further refined as follows: S312, when the air conditioning system is in cooling operation mode or dehumidification operation mode, and the current center plate temperature Ti is greater than or equal to the first center plate temperature threshold Tis1 and continues for a first time threshold t1, and the current outdoor ambient temperature To is less than the first outdoor ambient temperature threshold Tos1, the target temperature adjustment mode is determined to be normal cooling mode; and S313, when the air conditioning system is in cooling operation mode or dehumidification operation mode, and the current center plate temperature Ti is greater than or equal to the first center plate temperature threshold Tis1 and continues for a first time threshold t1, and the current outdoor ambient temperature To is greater than or equal to the first outdoor ambient temperature threshold Tos1 and continues for a second time threshold t2, the target temperature adjustment mode is determined to be enhanced cooling mode.

[0077] Specifically, the operating mode of the air conditioning system should be determined first. The operating mode differs from the temperature control mode. The temperature control mode is automatically determined by the air conditioning system based on external environmental factors; the operating mode is the mode selected by the user when the air conditioning system is turned on. It can also be understood that the operating mode is the basis for the temperature control mode; the temperature control mode may differ under different operating modes. For example, operating modes may include cooling, dehumidification, and heating modes. In cooling and dehumidification modes, the temperature control mode can be adjusted between normal cooling and enhanced cooling modes; in heating mode, the temperature control mode can be adjusted between basic heating and enhanced heating modes.

[0078] Based on this, in this invention, the operating mode of the air conditioning system can be determined first. If it is determined that the air conditioning system is in cooling operation mode and dehumidification operation mode, the relationship between the current center plate temperature Ti and the first center plate temperature threshold Tis1 can be further determined. If the current center plate temperature Ti and the first center plate temperature threshold Tis1 satisfy: Ti≥Tis1 and last for t1, the relationship between the current outdoor ambient temperature To and the first outdoor ambient temperature threshold Tos1 can be further determined. If the current outdoor ambient temperature To and the first outdoor ambient temperature threshold Tos1 satisfy: To<Tos1, the current cooling demand can be determined to be low, and the target temperature adjustment mode can be determined to be the normal cooling mode. If the current outdoor ambient temperature To and the first outdoor ambient temperature threshold Tos1 satisfy: To≥Tos1 and last for t2, the current cooling demand can be determined to be high, and the target temperature adjustment mode can be determined to be the enhanced cooling mode.

[0079] When the air conditioning system enters the normal cooling mode, the relationship between the current center plate temperature Ti and the first center plate temperature threshold Tis1 is determined again. When the air conditioning system enters the enhanced cooling mode, the relationship between the current center plate temperature Ti and the first center plate temperature threshold Tis1 is no longer determined, and only the relationship between the current outdoor ambient temperature To and the first outdoor ambient temperature threshold Tos1 is determined.

[0080] If the air conditioning system adopts Figure 4 As shown in the diagram, when the target temperature control mode is determined to be the normal cooling mode, the four-way valve 11 can be adjusted to the cooling indicator position; simultaneously, the first solenoid valve 12, the first electronic expansion valve 14, the second solenoid valve 15, and the second electronic expansion valve 16 are opened, while the third electronic expansion valve 40, the first sub-solenoid valve 410, the second sub-solenoid valve 411, the fourth solenoid valve 7, the fifth solenoid valve 8, the temperature control source solenoid valve 21, and the water pump 22 are closed. When the target temperature control mode is determined to be the enhanced cooling mode, the four-way valve 11 can be adjusted to the cooling indicator position; simultaneously, the first solenoid valve 12, the first electronic expansion valve 14, the second electronic expansion valve 16, the third electronic expansion valve 40, the first sub-solenoid valve 410, the temperature control source solenoid valve 21, and the water pump 22 are opened, while the second solenoid valve 15, the second sub-solenoid valve 411, the fourth solenoid valve 7, and the fifth solenoid valve 8 are closed.

[0081] The refrigerant flow path for normal and enhanced cooling modes can be found by referring to... Figure 4 As described in the embodiments, it will not be repeated here.

[0082] In this embodiment, the mid-disk temperature of the indoor heat exchanger can be the average mid-disk temperature, and the first mid-disk temperature threshold Tis1 can be the first average mid-disk temperature threshold. Using the average mid-disk temperature of the heat exchanger as a condition for determining the temperature control mode ensures the accuracy of determining the operating state of the indoor heat exchanger, thereby improving the accuracy of determining the target temperature control mode. Furthermore, the specific values ​​of the first mid-disk temperature threshold Tis1, the first outdoor ambient temperature threshold Tos1, the first time threshold t1, and the second time threshold t2 can be set by those skilled in the art according to actual needs and are pre-stored in the air conditioning system. This embodiment of the invention does not elaborate on or limit these settings. For example, the first mid-disk temperature threshold Tis1 and the first outdoor ambient temperature threshold Tos1 can be critical values ​​for judging the level of cooling demand, and their specific values ​​are not limited.

[0083] For example, based on the above embodiments, the basic temperature control mode may also include a normal heating mode, and the enhanced temperature control mode may also include an enhanced heating mode. In this embodiment, S212 can be further refined as follows: S314, when the air conditioning system is in heating operation mode, and the current center plate temperature Ti is less than or equal to the second center plate temperature threshold Tis2 and continues for a third time threshold t3, and the current outdoor ambient temperature To is greater than the second outdoor ambient temperature threshold Tos2, the target temperature control mode is determined to be a normal heating mode; and S315, when the air conditioning system is in heating operation mode, and the current center plate temperature Ti is less than or equal to the second center plate temperature threshold Tis2 and continues for a third time threshold t3, and the current outdoor ambient temperature To is less than or equal to the second outdoor ambient temperature threshold Tos2 and continues for a fourth time threshold t4, the target temperature control mode is determined to be an enhanced heating mode.

[0084] Specifically, the operating mode of the air conditioning system can still be determined first. If the air conditioning system is determined to be in heating mode, the relationship between the current central plate temperature Ti and the second central plate temperature threshold Tis2 can be further determined. If the current central plate temperature Ti and the second central plate temperature threshold Tis2 satisfy: Ti≤Tis2 and last for t3, the relationship between the current outdoor ambient temperature To and the second outdoor ambient temperature threshold Tos2 can be further determined. If the current outdoor ambient temperature To and the second outdoor ambient temperature threshold Tos2 satisfy: To>Tos2, the current heating demand can be determined to be low, and the target temperature adjustment mode can be determined to be normal heating mode. If the current outdoor ambient temperature To and the second outdoor ambient temperature threshold Tos2 satisfy: To≤Tos2 and last for t4, the current heating demand can be determined to be high, and the target temperature adjustment mode can be determined to be enhanced heating mode.

[0085] When the air conditioning system enters the normal heating mode, the relationship between the current center plate temperature Ti and the second center plate temperature threshold Tis2 is determined again. When the air conditioning system enters the enhanced heating mode, the relationship between the current center plate temperature Ti and the second center plate temperature threshold Tis2 is no longer determined. Only the relationship between the current outdoor ambient temperature To and the second outdoor ambient temperature threshold Tos2 is determined.

[0086] If the air conditioning system adopts Figure 4 As shown in the diagram, when the target temperature control mode is determined to be the normal heating mode, the four-way valve 11 can be adjusted to the heating indicator position; simultaneously, the first solenoid valve 12, the first electronic expansion valve 14, the second solenoid valve 15, and the second electronic expansion valve 16 are opened, while the third electronic expansion valve 40, the first sub-solenoid valve 410, the second sub-solenoid valve 411, the fourth solenoid valve 7, the fifth solenoid valve 8, the temperature control source solenoid valve 21, and the water pump 22 are closed. When the target temperature control mode is determined to be the enhanced heating mode, the four-way valve 11 can be adjusted to the heating indicator position; simultaneously, the first solenoid valve 12, the first electronic expansion valve 14, the second solenoid valve 15, the second electronic expansion valve 16, the third electronic expansion valve 40, the second sub-solenoid valve 411, the temperature control source solenoid valve 21, and the water pump 22 are opened, while the first sub-solenoid valve 410, the fourth solenoid valve 7, and the fifth solenoid valve 8 are closed.

[0087] The refrigerant flow path for normal heating mode and enhanced heating mode can be referenced. Figure 4 As described in the embodiments, it will not be repeated here.

[0088] The specific values ​​of the second median temperature threshold Tis2, the second outdoor ambient temperature threshold Tos2, the third time threshold t3, and the fourth time threshold t4 can be set by those skilled in the art according to actual needs and are pre-stored in the air conditioning system. This embodiment of the invention does not elaborate on or limit these values. For example, the second median temperature threshold Tis2 and the second outdoor ambient temperature threshold Tos2 can be critical values ​​for judging the level of heating demand; their specific values ​​are not limited.

[0089] Optionally, in possible embodiments, the air conditioning system may also include a heat exchanger surface temperature sensor (not shown in the accompanying drawings) to collect the current surface temperature of the outdoor heat exchanger. The heat exchanger surface temperature sensor can be electrically connected to the temperature control mode determination module. After the air conditioning system enters normal heating mode or enhanced heating mode, it can determine the defrosting conditions of the outdoor unit. When the defrosting conditions are met, the air conditioning system enters defrosting mode. During the defrosting operation phase, the determination of the normal heating mode and enhanced heating mode conditions is not performed. After defrosting is completed, the system continues to operate in the temperature control mode before defrosting. That is, if the system was in normal heating mode before defrosting, it will continue to operate in normal heating mode after defrosting; if the system was in enhanced heating mode before defrosting, it will continue to operate in enhanced heating mode after defrosting.

[0090] When defrosting mode is running, the four-way valve 11 can be adjusted to the heating position, and at the same time the second electronic expansion valve 16, the third electronic expansion valve 40, the second sub-solenoid valve 411, the fourth solenoid valve 7, the fifth solenoid valve 8, the temperature control source solenoid valve 21 and the water pump 22 are opened, while the first solenoid valve 12, the first electronic expansion valve 14, the second solenoid valve 15 and the first sub-solenoid valve 410 are closed.

[0091] Specifically, if the relative magnitude of the current surface temperature of the heat exchanger and the heat exchanger surface temperature threshold satisfies a preset relationship, then it can be determined that the defrosting conditions are met. The method of setting the preset relationship is not limited; those skilled in the art can set it according to actual needs. For example, it can be determined that the defrosting conditions are met when the current surface temperature of the heat exchanger is lower than the heat exchanger surface temperature threshold, but it is not limited to this.

[0092] Figure 5 The control logic diagram of the air conditioning system control method provided in the embodiments of the present invention is shown below in conjunction with... Figure 5 The control method in this invention will be described in detail below. Figure 5As shown, when the air conditioning system is turned on and the system is in cooling or dehumidification mode, it checks whether the current center temperature Ti and the first center temperature threshold Tis1 satisfy the first condition: Ti ≥ Tis1 for a duration of t1. If yes, it further checks whether the current outdoor temperature To and the first outdoor temperature threshold Tos1 satisfy the second condition: To ≥ Tos1 for a duration of t2. If not, the target temperature mode is determined to be normal cooling mode. Further, if the current outdoor temperature To and the first outdoor temperature threshold Tos1 satisfy the second condition, the target temperature mode is determined to be enhanced cooling mode; otherwise, the target temperature mode is determined to be normal cooling mode. During normal cooling mode, the first condition can be checked in real time; during enhanced cooling mode, the second condition can be checked in real time. When the air conditioning system is in heating mode, it checks whether the current center plate temperature Ti and the second center plate temperature threshold Tis2 satisfy the third condition: Ti ≤ Tis2 for a duration of t3. If yes, it further checks whether the current outdoor ambient temperature To and the second outdoor ambient temperature threshold Tos2 satisfy the third condition: To ≤ Tos2 for a duration of t4. If not, the target temperature adjustment mode is determined to be normal heating mode. Further, if the current outdoor ambient temperature To and the second outdoor ambient temperature threshold Tos2 satisfy the fourth condition, the target temperature adjustment mode is determined to be enhanced heating mode; if the fourth condition is not satisfied, the target temperature adjustment mode is determined to be normal heating mode. During normal heating mode, the third condition can be checked in real time; during enhanced heating mode, the fourth condition can be checked in real time. In addition, during the execution of normal heating mode and enhanced heating mode, it can also determine whether the defrosting conditions are met. If the defrosting conditions are met, the system will enter defrosting mode, and after defrosting is completed, it will execute normal heating mode and enhanced heating mode. If the defrosting conditions are not met, the system will not enter defrosting mode, and it will only execute normal heating mode or enhanced heating mode.

[0093] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, combinations, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. An air conditioning system, characterized by, It includes a first temperature control circuit, a second temperature control circuit, a connecting pipeline, and at least one electrically controlled valve located in the connecting pipeline; The first temperature control circuit and the second temperature control circuit are connected through the connecting pipe; The air conditioning system includes a basic temperature control mode and an enhanced temperature control mode. In the basic temperature control mode, the electronically controlled valve is closed, the first temperature control circuit is disconnected from the second temperature control circuit, and only the first temperature control circuit is used for temperature control. In the enhanced temperature control mode, the electronically controlled valve is open, the first temperature control circuit is connected to the second temperature control circuit, and both the first and second temperature control circuits are used for temperature control. The second temperature control circuit includes an auxiliary temperature control source, a temperature control source solenoid valve, a water pump, and an auxiliary heat exchanger that are interconnected. The auxiliary temperature control source includes one or more of the following: industrial waste cold source, industrial waste heat source, solar-generated cold source, solar-generated heat source, biomass-generated heat source, biomass-generated cold source, and geothermal energy. The first temperature control circuit includes a compressor, a four-way valve, a first solenoid valve, an outdoor heat exchanger, a first electronic expansion valve, a second solenoid valve, a second electronic expansion valve, an indoor heat exchanger, and a gas-liquid separator that are connected to each other. The connecting pipeline includes a first pipeline and a second pipeline. The first pipeline is used to connect the first temperature control circuit to the first flow port of the auxiliary heat exchanger, and the second pipeline is used to connect the first temperature control circuit to the second flow port of the auxiliary heat exchanger. The electrically controlled valve includes a third electronic expansion valve and a third solenoid valve. The third electronic expansion valve is located in the first pipeline, and the third solenoid valve is located in the second pipeline. In the basic temperature control mode, the third solenoid valve and the third electronic expansion valve are closed, and the refrigerant flows only in the first temperature control circuit; in the enhanced temperature control mode, the third solenoid valve and the third electronic expansion valve are open, and the refrigerant flows in the first temperature control circuit and the auxiliary heat exchanger. One end of the first pipeline is located in the communication path between the second solenoid valve and the second electronic expansion valve, and the other end of the first pipeline is connected to the first flow port; One end of the second pipeline is located in the communication path between the first electronic expansion valve and the second solenoid valve, and the other end of the second pipeline is connected to the second flow port; or, one end of the second pipeline is located in the communication path between the four-way valve and the gas-liquid separator, and the other end of the second pipeline is connected to the second flow port. When one end of the second pipeline is located in the communication path between the first electronic expansion valve and the second solenoid valve, the basic temperature control mode includes a normal cooling mode. In the normal cooling mode, the four-way valve is in the cooling flag position, the first solenoid valve, the first electronic expansion valve, the second solenoid valve, and the second electronic expansion valve are open, and the third electronic expansion valve, the third solenoid valve, the temperature control source solenoid valve, and the water pump are closed. The enhanced temperature control mode includes an enhanced cooling mode. In the enhanced cooling mode, the four-way valve is in the cooling flag position, the first solenoid valve, the first electronic expansion valve, the second electronic expansion valve, the third electronic expansion valve, the third solenoid valve, the temperature control source solenoid valve, and the water pump are open, and the second solenoid valve is closed. When one end of the second pipeline is located in the communication path between the four-way valve and the gas-liquid separator, the basic temperature control mode includes a normal heating mode. In the normal heating mode, the four-way valve is in the heating flag position, the first solenoid valve, the first electronic expansion valve, the second solenoid valve, and the second electronic expansion valve are open, and the third electronic expansion valve, the third solenoid valve, the temperature control source solenoid valve, and the water pump are closed. The enhanced temperature control mode includes an enhanced heating mode. In the enhanced heating mode, the four-way valve is in the heating flag position, and the first solenoid valve, the first electronic expansion valve, the second solenoid valve, the second electronic expansion valve, the third electronic expansion valve, the third solenoid valve, the temperature control source solenoid valve, and the water pump are open.

2. The air conditioning system of claim 1, wherein, The first temperature control circuit further includes a first connecting node, a second connecting node, and a third connecting node. The first connecting node is located between the second solenoid valve and the second electronic expansion valve. The second connecting node is located between the first electronic expansion valve and the second solenoid valve. The third connecting node is located between the four-way valve and the gas-liquid separator. The first pipeline is used to connect the first connecting node and the first flow port; the second pipeline includes a first sub-pipeline and a second sub-pipeline, the first sub-pipeline is used to connect the second connecting node and the second flow port, the second sub-pipeline is used to connect the third connecting node and the second flow port, and the third solenoid valve includes a first sub-solenoid valve and a second sub-solenoid valve, the first sub-solenoid valve is located in the first sub-pipeline, and the second sub-solenoid valve is located in the second sub-pipeline; The basic temperature control modes include a normal cooling mode and a normal heating mode. In the normal cooling mode, the four-way valve is in the cooling position, the first solenoid valve, the first electronic expansion valve, the second solenoid valve, and the second electronic expansion valve are open, and the third electronic expansion valve, the first sub-solenoid valve, the second sub-solenoid valve, the temperature control source solenoid valve, and the water pump are closed. In the normal heating mode, the four-way valve is in the heating position, the first solenoid valve, the first electronic expansion valve, the second solenoid valve, and the second electronic expansion valve are open, and the third electronic expansion valve, the first sub-solenoid valve, the second sub-solenoid valve, the temperature control source solenoid valve, and the water pump are closed. The enhanced heating mode includes an enhanced cooling mode and an enhanced heating mode. In the enhanced cooling mode, the four-way valve is in the cooling flag position, and the first solenoid valve, the first electronic expansion valve, the second electronic expansion valve, the third electronic expansion valve, the first sub-solenoid valve, the temperature control source solenoid valve, and the water pump are open, while the second solenoid valve and the second sub-solenoid valve are closed. In the enhanced heating mode, the four-way valve is in the heating flag position, and the first solenoid valve, the first electronic expansion valve, the second solenoid valve, the second electronic expansion valve, the third electronic expansion valve, the second sub-solenoid valve, the temperature control source solenoid valve, and the water pump are open, while the first sub-solenoid valve is closed.

3. The air conditioning system according to claim 2, characterized in that, It also includes a first refrigerant line, a second refrigerant line, a fourth solenoid valve, and a fifth solenoid valve; one end of the first refrigerant line is connected to the outlet of the compressor, and the other end of the first refrigerant line is located in the communication path between the outdoor heat exchanger and the first electronic expansion valve, and the fourth solenoid valve is located in the first refrigerant line; one end of the second refrigerant line is connected to the first communication node, and the other end of the second refrigerant line is located in the communication path between the first solenoid valve and the outdoor heat exchanger, and the fifth solenoid valve is located in the second refrigerant line; The air conditioning system also includes a defrost mode. In the defrost mode, the four-way valve is in the heating position, and the second electronic expansion valve, the third electronic expansion valve, the second sub-solenoid valve, the fourth solenoid valve, the fifth solenoid valve, the temperature control source solenoid valve, and the water pump are turned on, while the first solenoid valve, the first electronic expansion valve, the second solenoid valve, and the first sub-solenoid valve are turned off.

4. The air conditioning system according to claim 2, characterized in that, It also includes a temperature control mode determination module, which is used to obtain the current middle plate temperature of the indoor heat exchanger and the current outdoor ambient temperature, and determine the target temperature control mode based on the relationship between the current middle plate temperature and the middle plate temperature threshold, and the relationship between the current outdoor ambient temperature and the outdoor ambient temperature threshold.

5. A control method for an air conditioning system, characterized in that, The control method for controlling the air conditioning system according to any one of claims 1 to 4 includes: Determine the target temperature control mode of the air conditioning system; When the target temperature control mode is the basic temperature control mode, the control valve is closed, the first temperature control circuit and the second temperature control circuit are disconnected, and only the first temperature control circuit is used for temperature control; when the target temperature control mode is the enhanced temperature control mode, the control valve is opened, the first temperature control circuit and the second temperature control circuit are connected, and the first temperature control circuit and the second temperature control circuit are used for temperature control.

6. The control method according to claim 5, characterized in that, The first temperature control circuit includes a compressor, a four-way valve, a first solenoid valve, an outdoor heat exchanger, a first electronic expansion valve, a second solenoid valve, a second electronic expansion valve, an indoor heat exchanger, and a gas-liquid separator connected in sequence; the second temperature control circuit includes an auxiliary temperature control source, a temperature control source solenoid valve, a water pump, and an auxiliary heat exchanger connected in sequence; the connecting pipeline includes a first pipeline and a second pipeline, the first pipeline being used to connect the first temperature control circuit and the first flow port of the auxiliary heat exchanger, and the second pipeline being used to connect the first temperature control circuit and the second flow port of the auxiliary heat exchanger; the electronically controlled valve includes a third electronic expansion valve and a third solenoid valve, the third electronic expansion valve being located in the first pipeline, and the third solenoid valve being located in the second pipeline; Determining the target temperature control mode of the air conditioning system includes: Obtain the current center plate temperature of the indoor heat exchanger and the current outdoor ambient temperature; The target temperature control mode is determined based on the relationship between the current center plate temperature and the center plate temperature threshold, and the relationship between the current outdoor ambient temperature and the outdoor ambient temperature threshold. When the target temperature control mode is the basic temperature control mode, the control valve is closed, the first temperature control circuit and the second temperature control circuit are disconnected, and only the first temperature control circuit is used for temperature control; when the target temperature control mode is the enhanced temperature control mode, the control valve is opened, the first temperature control circuit and the second temperature control circuit are connected, and temperature control is performed using both the first temperature control circuit and the second temperature control circuit, including: When the target temperature control mode is the basic temperature control mode, the third solenoid valve and the third electronic expansion valve are controlled to close, so that the refrigerant flows only in the first temperature control circuit; when the target temperature control mode is the enhanced temperature control mode, the third solenoid valve and the third electronic expansion valve are controlled to open, so that the refrigerant flows in the first temperature control circuit and the auxiliary heat exchanger.

7. The control method according to claim 6, characterized in that, The basic temperature control mode includes a normal cooling mode, and the enhanced temperature control mode includes an enhanced cooling mode; Before obtaining the current center plate temperature of the indoor heat exchanger and the current outdoor ambient temperature, the process also includes: The operating mode of the air conditioning system is determined, and the operating mode includes at least a cooling operating mode, a dehumidification operating mode, and a heating operating mode; The target temperature control mode is determined based on the relationship between the current center plate temperature and the center plate temperature threshold, and the relationship between the current outdoor ambient temperature and the outdoor ambient temperature threshold, including: When the air conditioning system is in the cooling operation mode or the dehumidification operation mode, and the current center plate temperature is greater than or equal to the first center plate temperature threshold and remains at the first time threshold, and the current outdoor ambient temperature is less than the first outdoor ambient temperature threshold, the target temperature adjustment mode is determined to be the normal cooling mode. When the air conditioning system is in the cooling operation mode or the dehumidification operation mode, and the current center plate temperature is greater than or equal to the first center plate temperature threshold and remains at the first time threshold, and the current outdoor ambient temperature is greater than or equal to the first outdoor ambient temperature threshold and remains at the second time threshold, the target temperature adjustment mode is determined to be the enhanced cooling mode.

8. The control method according to claim 7, characterized in that, The basic temperature control mode also includes a normal heating mode, and the enhanced temperature control mode also includes an enhanced heating mode; Determining the target temperature control mode based on the relationship between the current center plate temperature and the center plate temperature threshold, and the relationship between the current outdoor ambient temperature and the outdoor ambient temperature threshold, further includes: When the air conditioning system is in the heating operation mode, and the current center plate temperature is less than or equal to the second center plate temperature threshold and remains at the third time threshold, and the current outdoor ambient temperature is greater than the second outdoor ambient temperature threshold, the target temperature adjustment mode is determined to be the normal heating mode. When the air conditioning system is in the heating operation mode, and the current center plate temperature is less than or equal to the second center plate temperature threshold and remains at the third time threshold, and the current outdoor ambient temperature is less than or equal to the second outdoor ambient temperature threshold and remains at the fourth time threshold, the target temperature adjustment mode is determined to be the enhanced heating mode.

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