Air conditioning system and control method, device for air conditioning system

Abstract

This application relates to the field of air conditioning technology and discloses an air conditioning system, including: a first reversing valve having a first e port, a first d port, and a first s port; a second reversing valve having a second d port, a second c port, and a second s port; a compressor having an exhaust port and an intake port, the exhaust port being connected to the first d port and the second d port, and the intake port being connected to the first s port and the second s port; an outdoor heat exchanger connected to the second c port; an indoor heat exchanger connected to the outdoor heat exchanger and also connected to the first e port; a water-refrigerant heat exchanger having a refrigerant inlet and a refrigerant outlet, the refrigerant inlet being connected to the refrigerant pipeline between the first d port, the second d port, and the exhaust port, and the refrigerant outlet being connected to the refrigerant pipeline between the indoor and outdoor heat exchangers; and a floor heating control valve located on the refrigerant pipeline at the refrigerant outlet. This application can reduce the risk of the water-refrigerant heat exchanger freezing and cracking due to refrigerant stagnation or insufficient heat. This application also discloses a control method and apparatus for an air conditioning system.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, for example to an air conditioning system and a control method and apparatus for the air conditioning system. Background Technology

[0002] Currently, as air conditioning systems develop towards multi-terminal and multi-functional directions, they not only need to meet traditional cooling and heating demands but also need to operate in conjunction with water systems such as underfloor heating systems to achieve independent or combined energy supply to air conditioning terminals and underfloor heating terminals. Based on this, a related technology proposes an air conditioning system comprising: a compressor; a first four-way valve, wherein the first port of the first four-way valve is connected to the compressor's exhaust port, the second port of the first four-way valve is connected to the refrigerant inlet of the water-refrigerant heat exchanger, the third port of the first four-way valve is connected to the refrigerant outlet of the outdoor heat exchanger, and the fourth port of the first four-way valve is connected to the compressor's air inlet; and a second four-way valve, wherein the first port of the second four-way valve is connected to the compressor's exhaust port, the second port of the second four-way valve is connected to the refrigerant inlet of the indoor heat exchanger, the third port of the second four-way valve is connected to the refrigerant outlet of the outdoor heat exchanger, and the fourth port of the second four-way valve is connected to the compressor's air inlet.

[0003] In the process of implementing the embodiments of this disclosure, at least the following problems were found in the related art: Related technologies can achieve independent or combined operation of different terminals by switching between the first and second four-way valves. However, in pursuit of heat exchange efficiency and compact size, water-fluorine heat exchangers typically employ plate heat exchangers, which have poor freeze resistance. This structure limits the refrigerant-side state of the water-fluorine heat exchanger to the switching of the four-way valve. Under conditions such as low-temperature standby, non-heating operation, or even pipeline valve leaks, it is difficult to ensure that the water-fluorine heat exchanger consistently receives sufficient heat to prevent water-side freezing, thus increasing the risk of freezing and cracking.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0006] This disclosure provides an air conditioning system and a control method and apparatus for the air conditioning system, which effectively reduces the risk of water-fluorine heat exchangers freezing and cracking due to refrigerant retention or insufficient heat, and helps to improve the safety and reliability of the air conditioning system under multi-terminal and multi-operating conditions.

[0007] In some embodiments, the air conditioning system includes: a first reversing valve having a first e port, a first d port, and a first s port; a second reversing valve having a second d port, a second c port, and a second s port; a compressor having an exhaust port and an intake port, the exhaust port being connected to the first d port and the second d port respectively, and the intake port being connected to the first s port and the second s port respectively; an outdoor heat exchanger connected to the second c port; an indoor heat exchanger connected to the outdoor heat exchanger and also connected to the first e port; a water-refrigerant heat exchanger having a refrigerant inlet and a refrigerant outlet, the refrigerant inlet being connected to a refrigerant pipeline between the first d port, the second d port, and the compressor exhaust port, and the refrigerant outlet being connected to a refrigerant pipeline between the indoor heat exchanger and the outdoor heat exchanger; and a floor heating control valve disposed on the refrigerant pipeline at the refrigerant outlet.

[0008] In some embodiments, the control method includes: obtaining the current operating mode of the air conditioning system; and, when the current operating mode is air conditioning cooling mode or air conditioning heating mode, controlling the floor heating control valve to periodically open according to the current system load to return oil to the water-fluorine heat exchanger.

[0009] In some embodiments, the control device includes a processor and a memory storing program instructions, the processor being configured to execute the control method for an air conditioning system described above when the program instructions are executed.

[0010] The air conditioning system and control method and apparatus for the air conditioning system provided in this disclosure can achieve the following technical effects: This embodiment of the invention installs a first reversing valve and a second reversing valve on the compressor discharge side, and connects the refrigerant inlet of the water-refrigerant heat exchanger to the refrigerant pipeline between the compressor discharge port and the first and second reversing valves. This ensures that the water-refrigerant heat exchanger is always on the high-temperature refrigerant side during system operation. Simultaneously, the refrigerant outlet of the water-refrigerant heat exchanger is located on the refrigerant pipeline between the indoor and outdoor heat exchangers, and a floor heating control valve is installed at this location. This allows for independent control of the refrigerant flow in the water-refrigerant heat exchanger under different operating modes. Therefore, this embodiment of the invention frees the water-refrigerant heat exchanger from being entirely limited by the reversing state of the four-way valve. Even under conditions such as low-temperature standby, non-heating operation, or partial valve leakage, the high-temperature refrigerant can still periodically flow through the water-refrigerant heat exchanger through the opening of the floor heating control valve, providing necessary heat support to its water side. This effectively reduces the risk of the water-refrigerant heat exchanger freezing and cracking due to refrigerant stagnation or insufficient heat, thus improving the safety and reliability of the air conditioning system under multi-terminal and multi-condition operating conditions.

[0011] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0012] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein: Figure 1 This is a schematic diagram of the structure of an air conditioning system provided in an embodiment of this disclosure; Figure 2 This is a schematic diagram of another air conditioning system provided in an embodiment of this disclosure; Figure 3 This is a schematic diagram of a control method for an air conditioning system provided in an embodiment of this disclosure; Figure 4 This is a schematic diagram of another control method for an air conditioning system provided in an embodiment of this disclosure; Figure 5 This is a schematic diagram of another control method for an air conditioning system provided in an embodiment of this disclosure; Figure 6 This is a schematic diagram of a control device for an air conditioning system provided in an embodiment of this disclosure.

[0013] Figure label: 1: Outdoor unit; 2: Indoor unit; 10: Compressor; 21: First reversing valve; 22: Second reversing valve; 30: Outdoor heat exchanger; 40: Indoor heat exchanger; 50: Water-refrigerant heat exchanger; 511: Refrigerant inlet; 512: Refrigerant outlet; 521: Water inlet; 522: Water outlet; 61: Underfloor heating control valve; 62: Air conditioning control valve; 63: Subcooling control valve; 64: Outdoor unit control valve; 70: Water pump; 81: Liquid storage device; 82: Gas-liquid separator; 83: Oil separator; 90: Subcooling device; 910: Main heat exchange circuit; 920: Auxiliary heat exchange circuit; 100: Control device for air conditioning system; 1001: Processor; 1002: Memory; 1003: Communication interface; 1004: Bus. Detailed Implementation

[0014] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0015] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0016] Unless otherwise stated, the term "multiple" means two or more.

[0017] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0018] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0019] The term "correspondence" can refer to an association or binding relationship. The correspondence between A and B means that there is an association or binding relationship between A and B.

[0020] Combination Figure 1-2 As shown in the figure, this disclosure provides an air conditioning system, including: a compressor 10, a first reversing valve 21, a second reversing valve 22, an outdoor heat exchanger 30, an indoor heat exchanger 40, a water-refrigerant heat exchanger 50, and a floor heating control valve 61. The first reversing valve 21 has a first e port, a first d port, and a first s port. The second reversing valve 22 has a second d port, a second c port, and a second s port. The compressor 10 has an exhaust port and an intake port; the exhaust port is connected to both the first d port and the second d port, and the intake port is connected to both the first s port and the second s port. The outdoor heat exchanger 30 is connected to the second c port. The indoor heat exchanger 40 is connected to the outdoor heat exchanger 30 and also to the first e port. The water-refrigerant heat exchanger 50 has a refrigerant inlet 511 and a refrigerant outlet 512. The refrigerant inlet 511 is connected to the refrigerant pipeline between the first d port, the second d port, and the exhaust port of the compressor 10. The refrigerant outlet 512 is connected to the refrigerant pipeline between the indoor heat exchanger 40 and the outdoor heat exchanger 30. The underfloor heating control valve 61 is located on the refrigerant pipeline at the refrigerant outlet 512.

[0021] The air conditioning system provided in this embodiment of the present disclosure, by respectively installing a first reversing valve 21 and a second reversing valve 22 on the discharge side of the compressor 10, and connecting the refrigerant inlet 511 of the water-refrigerant heat exchanger 50 to the refrigerant pipeline between the compressor 10 discharge port and the first reversing valve 21 and the second reversing valve 22, ensures that the water-refrigerant heat exchanger 50 is always located on the high-temperature refrigerant side during system operation. Simultaneously, the refrigerant outlet 512 of the water-refrigerant heat exchanger 50 is located in the refrigerant pipeline between the indoor heat exchanger 40 and the outdoor heat exchanger 30, and a floor heating control valve 61 is installed at this location, thereby enabling independent control of the refrigerant flow state of the water-refrigerant heat exchanger 50 under different operating modes. Therefore, the embodiments disclosed herein make the water-fluorine heat exchanger 50 no longer completely limited by the switching state of the four-way valve. Even under conditions such as low-temperature standby, non-heating operation, or partial valve leakage, the high-temperature refrigerant can still be periodically flowed through the water-fluorine heat exchanger 50 by controlling the opening of the underfloor heating control valve 61, providing necessary heat support to its water side. This effectively reduces the risk of the water-fluorine heat exchanger 50 freezing and cracking due to refrigerant retention or insufficient heat, which is beneficial to improving the safety and reliability of the air conditioning system under multi-terminal and multi-condition operation.

[0022] Optionally, the air conditioning system includes an outdoor unit 1 and an indoor unit 2. The compressor 10, first reversing valve 21, second reversing valve 22, outdoor heat exchanger 30, and water-refrigerant heat exchanger 50 are all installed in the outdoor unit 1, while the indoor heat exchanger 40 is installed in the indoor unit 2. In this way, by centrally arranging components such as the compressor 10, first reversing valve 21, second reversing valve 22, outdoor heat exchanger 30, and water-refrigerant heat exchanger 50 in the outdoor unit 1, and separately arranging the indoor heat exchanger 40 in the indoor unit, it is beneficial to shorten the refrigerant piping length and reduce the complexity of the system layout.

[0023] Meanwhile, by arranging the water-refrigerant heat exchanger 50 inside the outdoor unit 1 and keeping the refrigerant pipeline between it and the compressor 10's discharge side relatively short, the high-temperature gaseous refrigerant is less likely to accumulate excessively during its migration to the water-refrigerant heat exchanger 50. Even in air conditioning cooling / heating mode, excessive low-temperature refrigerant is unlikely to accumulate inside the water-refrigerant heat exchanger 50. Based on this, oil return control can be achieved simply by periodically opening the underfloor heating control valve 61 at appropriate times, allowing the high-temperature refrigerant to flow through the water-refrigerant heat exchanger 50 regularly, providing it with the necessary heat support. This effectively avoids the risk of the water-refrigerant heat exchanger 50 freezing and further improves the anti-freeze reliability of the air conditioning system.

[0024] Optionally, there may be multiple outdoor heat exchangers 30. Specifically, the outdoor heat exchanger 30 includes a first outdoor heat exchanger and a second outdoor heat exchanger. The outlet pipe of the second outdoor heat exchanger in air conditioning cooling mode is connected to the middle pipe of the first outdoor heat exchanger, and an outdoor unit control valve 64 is installed on the middle pipe of the first outdoor heat exchanger. This expands the arrangement of the outdoor heat exchangers 30, extends the heat exchange path through segmented heat exchange, increases the effective heat exchange area, and improves its overall heat exchange efficiency.

[0025] Optionally, there are multiple indoor heat exchangers 40. These multiple indoor heat exchangers 40 are connected in parallel, and each indoor heat exchanger 40 is equipped with an air conditioning control valve 62 on its refrigerant pipeline connecting to the outdoor heat exchanger 30. In this way, by providing separate air conditioning control valves 62 for each of the multiple indoor heat exchangers 40, the refrigerant flow can be independently controlled according to the start / stop status of each indoor terminal, which helps improve the reliability of the air conditioning system under multi-terminal operating conditions.

[0026] Optionally, the water-fluorine heat exchanger 50 also has a water inlet 521 and a water outlet 522, with the water inlet 521 connected to the inlet water pipe and the water outlet 522 connected to the outlet water pipe. This allows for effective heat exchange between the refrigerant side and the water side within the water-fluorine heat exchanger 50, ensuring continuous water flow while providing heat support to the refrigerant side, thereby reducing the risk of freezing due to low-temperature stagnation on the water side.

[0027] Optionally, the air conditioning system also includes a water pump 70, which is installed in the water inlet pipe. In this way, the water pump 70 can drive the water-side circulation of the water-refrigerant heat exchanger 50, so that the water-side heat can be transferred to the underfloor heating terminals, thereby enabling the air conditioning system to operate in underfloor heating mode.

[0028] Optionally, the air conditioning system also includes a liquid storage device 81, which is installed in the refrigerant pipeline between the air conditioning control valve 62 and the outdoor heat exchanger 30. Thus, by installing the liquid storage device 81, the refrigerant can be temporarily stored and released under different operating conditions, which helps ensure the stable and efficient operation of the air conditioning system.

[0029] Optionally, the air conditioning system also includes a gas-liquid separator 82, which is connected to the first S-port and the second S-port, and to the suction port of the compressor 10. By setting up the gas-liquid separator 82, gas-liquid separation can be performed on the return gas side refrigerant, thereby preventing liquid refrigerant from directly entering the compressor 10, while ensuring a stable return gas state, which is beneficial for ensuring the safe and reliable operation of the air conditioning system.

[0030] Optionally, the air conditioning system also includes an oil separator 83, which is connected to the exhaust port of the compressor 10 and to both the first d port and the second d port. By installing the oil separator 83, lubricating oil can be separated and recovered on the exhaust side, reducing the probability of lubricating oil retention in the water-refrigerant heat exchanger 50. This facilitates periodic oil return control and improves the long-term reliability of the air conditioning system.

[0031] Optionally, the air conditioning system also includes a subcooling device 90, which is connected to a main heat exchange circuit 910 and an auxiliary heat exchange circuit 920. The main heat exchange circuit 910 is a refrigerant pipeline located between the indoor heat exchanger 40 and the outdoor heat exchanger 30. The first end of the auxiliary heat exchange circuit 920 is connected to the main heat exchange circuit 910, and the second end of the auxiliary heat exchange circuit 920 is connected to the refrigerant pipeline between the first and second S-ports and the gas-liquid separator 82. In this way, by setting up the main heat exchange circuit 910 and the auxiliary heat exchange circuit 920, a large temperature difference can be formed on both sides of the subcooling device 90. The refrigerant in the auxiliary circuit can absorb heat through vaporization to reduce the temperature of the refrigerant in the main circuit, thereby increasing the subcooling degree of the evaporator and improving the working capacity of the air conditioning system.

[0032] Optionally, the air conditioning system also includes a subcooling control valve 63, which is located in the heat exchange auxiliary circuit 920. In this way, the subcooling control valve 63 can control the vaporization and heat absorption of the refrigerant in the auxiliary circuit, preventing the liquid refrigerant from returning to the compressor 10, thereby ensuring the gas supply effect to the compressor 10.

[0033] Optionally, the underfloor heating control valve 61, the air conditioning control valve 62, the subcooling control valve 63, and the outdoor unit control valve 64 are all electronic expansion valves. This allows for precise adjustment via these electronic expansion valves, enabling accurate control of refrigerant flow on different branches, which helps ensure both antifreeze safety and system energy efficiency.

[0034] Optionally, in some embodiments, both the first reversing valve 21 and the second reversing valve 22 are four-way valves. The first reversing valve 21 also has a first port c, and the second reversing valve 22 also has a second port e. Both the first port c and the second port e are connected to a blind pipe. In this way, by reasonably configuring the connection state of the above-mentioned four-way valves, the switching requirements of multiple operating modes of the air conditioning system can be met, while also taking into account the flexibility of the system layout.

[0035] Optionally, in some other embodiments, both the first reversing valve 21 and the second reversing valve 22 are three-way valves. This allows for the reasonable configuration of the connection states of the three-way valves to meet the switching requirements of multiple operating modes of the air conditioning system, while simultaneously reducing the complexity of the system structure.

[0036] Optionally, in other embodiments, the first reversing valve 21 is a four-way valve, and the second reversing valve 22 is a three-way valve. The first reversing valve 21 also has a first port c, which is connected to a blind pipe. In this way, by reasonably configuring the connection states of the above-mentioned four-way valve and three-way valve, the switching requirements of multiple operating modes of the air conditioning system can be met, while taking into account the flexibility of system layout and reducing the complexity of system structure.

[0037] Optionally, in other embodiments, the first reversing valve 21 is a three-way valve, and the second reversing valve 22 is a four-way valve. The second reversing valve 22 also has a second e-port, which is connected to a blind pipe. In this way, by reasonably configuring the connection states of the above-mentioned three-way valve and four-way valve, the switching requirements of multiple operating modes of the air conditioning system can be met, while taking into account the flexibility of system layout and reducing the complexity of system structure.

[0038] Optionally, the air conditioning system also includes a control device 1000 for the air conditioning system. The control device 1000 for the air conditioning system is electrically connected to the underfloor heating control valve 61. In this way, the embodiments of this disclosure can execute corresponding control methods through the control device 1000 to independently control the refrigerant flow state of the water-fluorine heat exchanger 50 under different operating modes.

[0039] Based on the above air conditioning system, combined with Figure 3 As shown, this disclosure provides a control method for an air conditioning system, including: S101, The control device obtains the current operating mode of the air conditioning system.

[0040] S102, when the current operating mode is air conditioning cooling mode or air conditioning heating mode, the control device controls the floor heating control valve to open periodically according to the current system load in order to return oil to the water-fluorine heat exchanger.

[0041] The control method for air conditioning systems provided in this disclosure, after obtaining the current operating mode of the air conditioning system, determines whether the system is in air conditioning cooling mode or air conditioning heating mode. Based on the current system load, the underfloor heating control valve is periodically opened, allowing high-temperature refrigerant to flow through the water-refrigerant heat exchanger at an appropriate frequency, thereby achieving active oil return control of the water-refrigerant heat exchanger. This disclosure, by associating the oil return action with the system load, can appropriately increase the oil return frequency when the system load is low to avoid lubricating oil stagnating inside the water-refrigerant heat exchanger due to slower refrigerant flow. Conversely, it can appropriately decrease the oil return frequency when the system load is high, thus ensuring smooth lubricating oil recovery while avoiding unnecessary energy loss, which is beneficial for improving the stability and reliability of the air conditioning system during long-term operation.

[0042] Optionally, the control device controls the underfloor heating control valve to open periodically according to the current system load to return oil to the water-refrigerant heat exchanger. This includes: the control device determining the target oil return cycle of the water-refrigerant heat exchanger based on the current system load; and when the air conditioning system reaches the target oil return cycle during its operating time, the control device controls the underfloor heating control valve to open to return oil to the water-refrigerant heat exchanger. The current system load and the target oil return cycle are positively correlated.

[0043] Thus, this embodiment of the present disclosure can determine the target oil return cycle of the water-fluorine heat exchanger based on the current system load, and control the underfloor heating control valve to open on time when the system operation time reaches the target oil return cycle, thereby avoiding excessively frequent or prolonged absence of oil return action. Furthermore, by configuring the target oil return cycle to be positively correlated with the current system load, this embodiment of the present disclosure can dynamically adjust the oil return rhythm according to the actual operating status of the system, which is beneficial for balancing oil return effect and system energy efficiency performance under different load conditions.

[0044] Optionally, the control device determines the current system load in the following manner: if the air conditioning system includes multiple indoor heat exchangers, the control device calculates the current operating rate of the multiple indoor heat exchangers to obtain the current system load.

[0045] Thus, in the case where the air conditioning system includes multiple indoor heat exchangers, the embodiments of this disclosure obtain the current system load by calculating the current operating rate of multiple indoor heat exchangers. This can comprehensively reflect the actual operating conditions of multiple terminals operating simultaneously or partially, thereby making the control device's judgment of the system load closer to the real operating state, which is conducive to improving the applicability and accuracy of the oil return strategy in multi-terminal application scenarios.

[0046] Optionally, the control device determines the current system load in the following manner: if the air conditioning system includes an indoor heat exchanger, the control device calculates the ratio of the compressor's current operating frequency to its maximum operating frequency to obtain the current system load.

[0047] Thus, in the case where the air conditioning system includes only one indoor heat exchanger, the embodiments of this disclosure obtain the current system load by calculating the ratio of the compressor's current operating frequency to its maximum operating frequency. This directly reflects the compressor's output capacity and the system load level, thereby improving the real-time performance of system load determination and ensuring that the oil return strategy can be applied to single-terminal scenarios.

[0048] Optionally, the control device determines the target oil return cycle of the water-fluorine heat exchanger based on the current system load, including: when the current system load is less than or equal to the preset system load, the control device determines the target oil return cycle of the water-fluorine heat exchanger as a first oil return cycle; or, when the current system load is greater than the preset system load, the control device determines the target oil return cycle of the water-fluorine heat exchanger as a second oil return cycle. The first oil return cycle is shorter than the second oil return cycle.

[0049] Thus, this embodiment employs a shorter first oil return cycle when the system load is less than or equal to the preset system load, enabling the oil return strategy to be executed more frequently under low-load conditions, thereby effectively reducing the risk of lubricating oil retention inside the water-fluorine heat exchanger. Conversely, when the system load exceeds the preset system load, a longer second oil return cycle is used, enabling the oil return strategy to be executed less frequently under high-load conditions, thereby avoiding interference with the normal cooling and heating process of the air conditioning system during the oil return process and improving the stability of system operation.

[0050] Optionally, the first and second oil return cycles can be determined based on the compressor's own configuration parameters. When the compressor's operating frequency under standard conditions is relatively low, the first and second oil return cycles can be appropriately reduced to compensate for the decrease in oil return capacity caused by the reduced refrigerant flow rate and improve oil return reliability. Specifically, in some embodiments, the first oil return cycle can be set to 6 hours to control the water-fluorine heat exchanger to return oil once every 6 hours; the second oil return cycle can be set to 12 hours to control the water-fluorine heat exchanger to return oil once every 12 hours. The first and second oil return cycles can also be adjusted according to the user's actual needs or set to any other reasonable values.

[0051] Optionally, the preset system load can be set to 50% to control the water-fluoride heat exchanger to return oil at an appropriate frequency. The preset system load can also be adjusted according to the user's actual needs or set to any other reasonable value.

[0052] Optionally, after the control device controls the floor heating control valve to open to return oil to the water-fluorine heat exchanger, the control device further includes: acquiring the refrigerant outlet temperature; and if the refrigerant outlet temperature meets the oil return termination condition, controlling the control device to close the floor heating control valve to stop the oil return to the water-fluorine heat exchanger.

[0053] In this way, after the underfloor heating control valve is opened to return oil, the underfloor heating control valve can be closed when the refrigerant outlet temperature is obtained and the return oil termination condition is met. This allows for the setting of a clear termination criterion for the return oil process, thereby avoiding the problem of excessively long or insufficient return oil time and making the return oil process more controllable.

[0054] Optionally, the oil return termination condition includes: the temperature difference between the compressor discharge temperature and the refrigerant outlet temperature is less than or equal to a first temperature difference.

[0055] In this way, by using the temperature difference between the compressor discharge temperature and the refrigerant outlet temperature as the end condition for oil return, when the temperature difference between the two decreases to the set range, it indicates that the high-temperature refrigerant has fully flowed through the water-refrigerant heat exchanger and completed the necessary oil return process. This allows the floor heating control valve to be closed in time, avoiding unnecessary refrigerant circulation and helping to balance the oil return effect with system energy efficiency.

[0056] Based on the above air conditioning system, combined with Figure 4 As shown, this disclosure provides another control method for an air conditioning system, including: S201, The control device obtains the current operating mode of the air conditioning system.

[0057] S202, when the current operating mode is air conditioning cooling mode or air conditioning heating mode, the control device controls the floor heating control valve to open periodically according to the current system load in order to return oil to the water-fluorine heat exchanger.

[0058] Thus, when the air conditioning system is in cooling or heating mode, this embodiment can control the floor heating control valve to open periodically according to the current system load, allowing the high-temperature refrigerant to flow through the water-refrigerant heat exchanger at an appropriate frequency, thereby achieving active oil return control of the water-refrigerant heat exchanger. By linking the oil return action to the system load, the oil return frequency can be appropriately increased when the system load is low to avoid the lubricating oil from being more easily retained inside the water-refrigerant heat exchanger due to the slower refrigerant flow rate. Conversely, the oil return frequency can be appropriately decreased when the system load is high. This ensures smooth lubricating oil recovery while avoiding unnecessary energy loss, which is beneficial for improving the stability and reliability of the air conditioning system during long-term operation.

[0059] S203, when the current operating mode is air conditioning cooling mode or air conditioning heating mode, the control device controls the floor heating control valve to open according to the refrigerant inlet temperature in order to drain the water refrigerant heat exchanger.

[0060] Thus, when the air conditioning system is in cooling or heating mode, this embodiment can monitor the inlet temperature of the refrigerant circuit to determine the refrigerant state within the water-refrigerant heat exchanger and control the underfloor heating control valve to open in a timely manner, allowing the liquid refrigerant remaining in the water-refrigerant heat exchanger to be discharged promptly. When this embodiment determines that the water-refrigerant heat exchanger is full of liquid refrigerant, it can actively adjust the refrigerant flow path, thereby preventing the continuous retention of liquid refrigerant within the water-refrigerant heat exchanger and improving the stability and reliability of the air conditioning system during long-term operation.

[0061] S204, when the current operating mode is underfloor heating mode or air conditioning and underfloor heating mode, the control device controls the underfloor heating control valve to remain open.

[0062] Thus, when the air conditioning system is in underfloor heating mode or in a simultaneous air conditioning and underfloor heating mode, underfloor heating becomes the primary heating source. This embodiment of the invention keeps the underfloor heating control valve open, allowing high-temperature refrigerant to continuously flow through the water-refrigerant heat exchanger, providing a stable and continuous heat input to its water side. On one hand, this ensures the normal heating requirements of the underfloor heating system. On the other hand, it avoids low-temperature areas in the water-refrigerant heat exchanger due to localized refrigerant stagnation or uneven heat exchange during prolonged heating operation, effectively reducing the risk of water-side freezing and improving the reliability of the system under underfloor heating conditions.

[0063] S205, when the current operating mode is defrosting mode, the control device controls the floor heating control valve to open according to the compressor's discharge pressure.

[0064] Thus, when the air conditioning system enters defrost mode, the indoor and outdoor unit fans are usually off to reduce indoor temperature fluctuations and accelerate the defrosting process. This makes it difficult for the refrigerant heat to be released in a timely manner, easily leading to a continuous increase in compressor discharge pressure. This embodiment of the present disclosure monitors the compressor discharge pressure in real time and controls the underfloor heating control valve to open appropriately, allowing some of the high-temperature refrigerant to be diverted through the water-refrigerant heat exchanger. This effectively bypasses the high pressure of the system while providing heat to the underfloor heating side. This embodiment of the present disclosure can achieve high-pressure control without interrupting the defrosting process, thereby reducing the risk of high-pressure operation and improving the safety and reliability of system operation.

[0065] Optionally, the control device controls the floor heating control valve to open periodically based on the refrigerant inlet temperature to drain the water-refrigerant heat exchanger, including: the control device acquiring the refrigerant inlet temperature and the outdoor ambient temperature; when the temperature difference between the refrigerant inlet temperature and the outdoor ambient temperature is less than or equal to a second temperature difference, the control device controls the floor heating control valve to open to drain the water-refrigerant heat exchanger.

[0066] Thus, when the temperature difference between the refrigerant inlet temperature and the outdoor ambient temperature is within the set temperature difference range, it indicates that the water-refrigerant heat exchanger is filled with liquid refrigerant, and the heat exchange between the refrigerant and the environment tends to be balanced. This embodiment of the invention can control the underfloor heating control valve to open in a timely manner, allowing excess liquid refrigerant in the water-refrigerant heat exchanger to be discharged promptly, thereby preventing the continuous retention of liquid refrigerant in the heat exchanger and improving the stability and reliability of the air conditioning system during long-term operation.

[0067] Optionally, after the control device controls the floor heating control valve to open to drain the water-fluorine heat exchanger, the control device further includes: acquiring the refrigerant outlet temperature; and if the refrigerant outlet temperature meets the draining termination condition, controlling the floor heating control valve to close to stop draining the water-fluorine heat exchanger.

[0068] In this way, after the underfloor heating control valve is opened to drain the liquid, the underfloor heating control valve can be closed when the refrigerant outlet temperature is obtained and the draining end condition is met. This allows for the setting of a clear end criterion for the draining process, thereby avoiding problems such as excessive or insufficient draining time and making the draining process more controllable.

[0069] Optionally, the discharge termination condition includes: the temperature difference between the compressor discharge temperature and the refrigerant outlet temperature is less than or equal to a third temperature difference.

[0070] In this way, by using the temperature difference between the compressor discharge temperature and the refrigerant outlet temperature as the condition for ending the draining process, when the temperature difference between the two decreases to the preset range, it indicates that the excess liquid refrigerant inside the water-refrigerant heat exchanger has been basically drained, so that the floor heating control valve can be closed in time to avoid unnecessary refrigerant circulation, which is conducive to balancing the draining effect and system energy efficiency.

[0071] Optionally, the control device controls the floor heating control valve to open based on the compressor's discharge pressure, including: when the compressor's discharge pressure is greater than or equal to a discharge pressure threshold, the control device controls the floor heating control valve to open.

[0072] Thus, when the air conditioning system enters defrost mode, since the indoor and outdoor unit fans are usually off, the heat from the refrigerant in the system is difficult to release in time, and the compressor discharge pressure tends to rise continuously. This embodiment of the present disclosure sets a discharge pressure threshold and controls the underfloor heating control valve to open when the discharge pressure exceeds this threshold, allowing some of the high-temperature refrigerant to be diverted through the water-refrigerant heat exchanger, thereby effectively bypassing the high pressure in the system. Therefore, this embodiment of the present disclosure can achieve high-pressure control without interrupting the defrost process, thereby reducing the risk of high-pressure operation of the system and improving the safety and reliability of system operation.

[0073] Optionally, when the compressor's discharge pressure is greater than or equal to the discharge pressure threshold, the control device controls the floor heating control valve to open, including: the control device controls the floor heating control valve to periodically increase its opening degree; when the compressor's discharge pressure is less than the discharge pressure threshold, the control device controls the floor heating control valve to stop increasing its opening degree.

[0074] Thus, this embodiment of the invention can progressively adjust the opening of the underfloor heating control valve according to changes in exhaust pressure, matching the amount of refrigerant diverted to the high-pressure state of the system. When the exhaust pressure gradually decreases below the exhaust pressure threshold, this embodiment of the invention stops further increasing the opening of the underfloor heating control valve, avoiding excessive refrigerant diversion from adversely affecting defrosting efficiency or system energy efficiency. Therefore, this embodiment of the invention can achieve precise control of refrigerant flow while ensuring system pressure safety, which is beneficial for balancing energy efficiency and system reliability under defrosting conditions.

[0075] Based on the above air conditioning system, combined with Figure 5 As shown, this disclosure provides another control method for an air conditioning system, including: S301, The control device obtains the current operating mode of the air conditioning system.

[0076] S302, the control device controls the connection status of the first reversing valve and the second reversing valve according to the current operating mode.

[0077] S303, when the current operating mode is air conditioning cooling mode or air conditioning heating mode, the control device controls the floor heating control valve to open periodically according to the current system load in order to return oil to the water-fluorine heat exchanger.

[0078] In this way, after obtaining the current operating mode of the air conditioning system, the embodiments of this disclosure accurately control the connection state of the first reversing valve and the second reversing valve based on the current operating mode, so as to match the refrigerant flow direction with the current operating mode, thereby ensuring that the air conditioning system can reliably operate in the current operating mode, which is conducive to meeting the actual needs of users.

[0079] Optionally, the control device controls the connection state of the first reversing valve and the second reversing valve according to the current operating mode, including: when the current operating mode is air conditioning cooling mode, the control device controls the first reversing valve to connect its first e port and first s port, and controls the second reversing valve to connect its second d port and second c port.

[0080] In this way, when the air conditioning system is in cooling mode, by configuring the connection scheme of the first and second reversing valves, the high-temperature and high-pressure exhaust refrigerant can flow to the outdoor heat exchanger through the second reversing valve for condensation and heat release, while the throttled liquid refrigerant flows to the indoor heat exchanger for evaporation and heat absorption, thereby lowering the indoor temperature. Finally, it returns to the compressor suction side through the first reversing valve. During this process, although the water-refrigerant heat exchanger does not participate in the main circulation, because its refrigerant inlet is directly connected to the exhaust pipe, a small amount of high-temperature gaseous refrigerant will migrate into the water-refrigerant heat exchanger, maintaining its internal pressure and temperature at a high level. This allows the exhaust heat to be used to prevent ice formation on the water side without needing to open the underfloor heating control valve, thus improving the safety and reliability of the air conditioning system in cooling mode.

[0081] Optionally, the control device controls the connection state of the first reversing valve and the second reversing valve according to the current operating mode, including: when the current operating mode is the air conditioning heating mode, the control device controls the first reversing valve to connect its first d port and first e port, and controls the second reversing valve to connect its second c port and second s port.

[0082] In this way, when the air conditioning system is in heating mode, by configuring the connection scheme of the first and second reversing valves, the high-temperature and high-pressure exhaust refrigerant can flow through the first reversing valve to the indoor heat exchanger for condensation and heat release, thereby increasing the indoor temperature. The throttled liquid refrigerant flows to the outdoor heat exchanger for evaporation and heat absorption, and finally returns to the compressor suction side through the second reversing valve. During this process, although the water-refrigerant heat exchanger does not participate in the main circulation, because its refrigerant inlet is directly connected to the exhaust pipe, a small amount of high-temperature gaseous refrigerant will migrate into the water-refrigerant heat exchanger, maintaining its internal pressure and temperature at a high level. Thus, without needing to open the underfloor heating control valve, the exhaust heat can be used to prevent ice formation on the water side, which helps improve the safety and reliability of the air conditioning system in heating mode.

[0083] Optionally, the control device controls the connection state of the first reversing valve and the second reversing valve according to the current operating mode, including: when the current operating mode is the underfloor heating mode, the control device controls the first reversing valve to connect its first e port and first s port, and controls the second reversing valve to connect its second c port and second s port.

[0084] In this way, when the air conditioning system is in underfloor heating mode, by configuring the connection scheme of the first and second reversing valves mentioned above, the high-temperature and high-pressure exhaust refrigerant can directly flow into the water-refrigerant heat exchanger for condensation and heat release, heating the circulating water circuit for underfloor heating use. After releasing heat, the refrigerant enters the outdoor heat exchanger for evaporation and heat absorption after being throttled by the underfloor heating control valve, and finally returns to the compressor suction side through the second reversing valve. During this process, the compressor exhaust side is cut off at the first reversing valve, thereby cutting off the flow path of exhaust refrigerant to the indoor heat exchanger, completely eliminating the refrigerant flow noise of the indoor unit in the pure underfloor heating mode, which helps to improve the quiet experience for users in underfloor heating mode.

[0085] Optionally, the control device controls the connection state of the first reversing valve and the second reversing valve according to the current operating mode, including: when the current operating mode is the simultaneous heating mode of air conditioning and floor heating, the control device controls the first reversing valve to connect its first d port and first e port, and controls the second reversing valve to connect its second c port and second s port.

[0086] In this way, when the air conditioning system is in simultaneous air conditioning and underfloor heating mode, the connection scheme of the first and second reversing valves allows the high-temperature, high-pressure exhaust refrigerant to be diverted. One portion flows through the first reversing valve to the indoor heat exchanger for condensation and heat release, thus rapidly increasing the indoor temperature. The other portion flows directly into the water-refrigerant heat exchanger for condensation and heat release, thereby heating the circulating water circuit for underfloor heating, which helps maintain a more even indoor temperature. After throttling, the two refrigerant streams converge and flow to the outdoor heat exchanger for evaporation and heat absorption, finally returning to the compressor suction side through the second reversing valve. This embodiment of the present invention can simultaneously meet the user's comfort needs for rapidly increasing room temperature and maintaining a constant floor temperature, thus improving the user's comfort experience in simultaneous air conditioning and underfloor heating mode.

[0087] Optionally, the control device controls the connection state of the first reversing valve and the second reversing valve according to the current operating mode, including: when the current operating mode is defrosting mode, the control device controls the first reversing valve to connect its first e port and first s port, and controls the second reversing valve to connect its second d port and second c port.

[0088] In this way, when the air conditioning system is in defrost mode, by configuring the connection scheme of the first and second reversing valves, the high-temperature, high-pressure exhaust refrigerant can flow through the second reversing valve to the outdoor heat exchanger for condensation and heat release, thereby quickly melting the frost layer using the heat of the refrigerant. The throttled liquid refrigerant then flows to the indoor heat exchanger for evaporation and heat absorption, and finally returns to the compressor suction side through the first reversing valve. During this process, the water-refrigerant heat exchanger is on the high-temperature refrigerant side, which can effectively reduce the risk of the water-refrigerant heat exchanger freezing and cracking. If the exhaust pressure is detected to be high, the underfloor heating control valve can also be opened in a timely manner, allowing some of the high-temperature refrigerant to be diverted through the water-refrigerant heat exchanger. This provides heat to the underfloor heating side while effectively bypassing the high pressure of the system, which helps to improve the safety and reliability of the air conditioning system in defrost mode.

[0089] Combination Figure 6 As shown, this embodiment of the disclosure provides a control device 1000 for an air conditioning system, including a processor 1001 and a memory 1002. Optionally, the control device 1000 may further include a communication interface 1003 and a bus 1004. The processor 1001, communication interface 1003, and memory 1002 can communicate with each other via the bus 1004. The communication interface 1003 can be used for information transmission. The processor 1001 can call logical instructions in the memory 1002 to execute the control method for the air conditioning system described in the above embodiment.

[0090] Furthermore, the logic instructions in the aforementioned memory 1002 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium.

[0091] The memory 1002, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as program instructions / modules corresponding to the methods in the embodiments of this disclosure. The processor 1001 executes functional applications and data processing by running the program instructions / modules stored in the memory 1002, thereby implementing the control method for the air conditioning system in the above embodiments.

[0092] The memory 1002 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created based on the use of the terminal device. Furthermore, the memory 1002 may include high-speed random access memory and may also include non-volatile memory.

[0093] This disclosure provides a computer-readable storage medium storing computer-executable instructions configured to perform the above-described control method for an air conditioning system.

[0094] The technical solutions of this disclosure can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes one or more instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in this disclosure. The aforementioned storage medium can be a non-transitory storage medium, such as a USB flash drive, external hard drive, read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk, etc., and other media capable of storing program code.

[0095] The foregoing description and accompanying drawings fully illustrate embodiments of this disclosure to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, procedural, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terminology used in this application is for describing embodiments only and is not intended to limit the claims. As used in the description of embodiments and claims, the singular forms “a,” “an,” and “the” are intended to equally include the plural forms unless the context clearly indicates otherwise. Similarly, the term “and / or” as used in this application means including one or more of the associated listed items and all possible combinations thereof. Additionally, when used in this application, the term "comprise" and its variations "comprises" and / or "comprising" refer to the presence of stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. Without further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, or apparatus that includes said element. In this document, each embodiment may focus on the differences from other embodiments, and similar or identical parts between embodiments can be referred to mutually. For methods, products, etc., disclosed in the embodiments, if they correspond to the method section disclosed in the embodiments, the relevant parts can be referred to the description of the method section.

[0096] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the embodiments of this disclosure. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0097] The methods and products disclosed in the embodiments herein (including but not limited to devices and equipment) can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of units may be merely a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be electrical, mechanical, or other forms. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to implement this embodiment according to actual needs. In addition, the functional units in the embodiments of this disclosure may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0098] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than that shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks may also occur in a different order than disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. Each block in a block diagram and / or flowchart, and combinations of blocks in a block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

Claims

1. An air conditioning system, characterized by, include: The first directional valve has a first e port, a first d port, and a first s port; The second directional valve has a second d port, a second c port, and a second s port; The compressor has an exhaust port and an intake port. The exhaust port is connected to the first d port and the second d port respectively, and the intake port is connected to the first s port and the second s port respectively. The outdoor heat exchanger is connected to the second port C. The indoor heat exchanger is connected to the outdoor heat exchanger and to the first e port; The water-fluorine heat exchanger has a fluorine inlet and a fluorine outlet. The fluorine inlet is connected to the refrigerant pipeline between the first d port, the second d port and the compressor exhaust port. The fluorine outlet is connected to the refrigerant pipeline between the indoor heat exchanger and the outdoor heat exchanger. The floor heating control valve is located on the refrigerant pipeline at the refrigerant outlet.

2. The air conditioning system of claim 1, wherein, The air conditioning system includes an outdoor unit and an indoor unit. The water-fluoride heat exchanger and the outdoor heat exchanger are installed on the outdoor unit, and the indoor heat exchanger is installed on the indoor unit.

3. The air conditioning system according to claim 1, characterized in that, Water-fluoride heat exchangers also include: The water inlet is connected to the water inlet pipe. The water outlet is connected to the water outlet pipeline; A water pump is installed in the water inlet pipe.

4. The air conditioning system according to claim 1, characterized in that, Also includes: Air conditioning control valve, located in the refrigerant pipeline between the indoor heat exchanger and the outdoor heat exchanger; A liquid storage device is a refrigerant pipeline located between the air conditioning control valve and the outdoor heat exchanger.

5. The air conditioning system according to claim 1, characterized in that, Also includes: The gas-liquid separator is connected to the first S port and the second S port respectively, and is also connected to the suction port of the compressor. The subcooling device is equipped with a main heat exchange line and an auxiliary heat exchange line. The main heat exchange line is a refrigerant pipeline located between the indoor heat exchanger and the outdoor heat exchanger. The first end of the auxiliary heat exchange line is connected to the main heat exchange line, and the second end of the auxiliary heat exchange line is connected to the refrigerant pipeline between the first S-port, the second S-port, and the gas-liquid separator.

6. A control method for an air conditioning system, characterized in that, The control method, applied to an air conditioning system as described in any one of claims 1 to 5, comprises: Obtain the current operating mode of the air conditioning system; When the current operating mode is air conditioning cooling mode or air conditioning heating mode, the floor heating control valve is periodically opened according to the current system load to return oil to the water-fluorine heat exchanger.

7. The control method according to claim 6, characterized in that, The underfloor heating control valve is periodically opened according to the current system load to return oil to the water-refrigerant heat exchanger, including: Determine the target oil return cycle of the water-fluoride heat exchanger based on the current system load; When the air conditioning system reaches the target oil return cycle during its operating time, the floor heating control valve is opened to return oil to the water-fluorine heat exchanger. The current system load and the target oil return cycle are positively correlated.

8. The control method according to claim 7, characterized in that, After controlling the opening of the underfloor heating control valve to return oil to the water-refrigerant heat exchanger, the process also includes: Obtain the outlet temperature of the refrigerant circuit; When the refrigerant outlet temperature meets the conditions for ending the oil return process, the floor heating control valve is closed to stop the oil return to the water-refrigerant heat exchanger.

9. The control method according to claim 6, characterized in that, After obtaining the current operating mode of the air conditioning system, the following is also included: When the current operating mode is air conditioning cooling mode or air conditioning heating mode, the floor heating control valve is opened according to the refrigerant inlet temperature to drain the refrigerant from the water-refrigerant heat exchanger; or, When the current operating mode is underfloor heating mode or simultaneous air conditioning and underfloor heating mode, the underfloor heating control valve remains open; or... When the current operating mode is defrosting mode, the floor heating control valve is opened according to the compressor's discharge pressure.

10. The control method according to any one of claims 6 to 9, characterized in that, After obtaining the current operating mode of the air conditioning system, the following is also included: Based on the current operating mode, control the connection status of the first and second directional valves.

11. The method according to claim 10, characterized in that, Based on the current operating mode, control the connection state of the first and second directional valves, including: When the current operating mode is air conditioning cooling mode, control the first reversing valve to connect its first e port and first s port, and control the second reversing valve to connect its second d port and second c port; or, When the current operating mode is air conditioning heating mode, control the first reversing valve to connect its first d port and first e port, and control the second reversing valve to connect its second c port and second s port; or, When the current operating mode is underfloor heating mode, control the first reversing valve to connect its first e port and first s port, and control the second reversing valve to connect its second c port and second s port; or, When the current operating mode is simultaneous air conditioning and floor heating, control the first reversing valve to connect its first d port and first e port, and control the second reversing valve to connect its second c port and second s port; or, When the current operating mode is defrosting mode, control the first reversing valve to connect its first e port and first s port, and control the second reversing valve to connect its second d port and second c port.

12. A control device for an air conditioning system, comprising a processor and a memory storing program instructions, characterized in that, The processor is configured to execute, when running the program instructions, the control method for an air conditioning system as described in any one of claims 6 to 11.

Images