Air conditioning system and air conditioning control method

Abstract

This disclosure relates to an air conditioning system and an air conditioning control method. The air conditioning system includes a compressor, a four-way valve, a heat exchange assembly, and a first bypass pipe. The compressor has an outlet and an inlet. The four-way valve has a first interface, a second interface, a third interface, and a fourth interface. The heat exchange assembly includes an outdoor heat exchanger and an indoor heat exchanger that are interconnected. The outlet is connected to the first interface, and the second interface is connected to the outdoor heat exchanger. The indoor heat exchanger is connected to the third interface, and the fourth interface is connected to the inlet. The opposite ends of the first bypass pipe are connected to the outlet and the outdoor heat exchanger, respectively. The air conditioning system has a cooling mode, and the first bypass pipe is configured in the cooling mode so that at least a portion of the refrigerant output from the outlet can bypass the four-way valve and enter the outdoor heat exchanger through the first bypass pipe. This air conditioning system is beneficial for quickly reducing the indoor ambient temperature, improving the cooling efficiency and effect of the air conditioning system in cooling mode, and reducing the impact force of the refrigerant on the four-way valve, thus helping to extend the service life of the four-way valve.

Description

Technical Field

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

[0002] Air conditioning systems can be used to regulate the temperature of a space. Specifically, they can cool the indoor environment in cooling mode or heat the indoor environment in heating mode, thereby providing users with a comfortable temperature environment.

[0003] In related technologies, air conditioning systems use a four-way valve to switch the flow of refrigerant, thus achieving refrigerant circulation. Specifically, the compressor heats and pressurizes the refrigerant. After heating and pressurizing, the refrigerant is guided through the four-way valve into the heat exchange components for heat exchange. The temperature and pressure of the refrigerant are then reduced, and it is guided back to the compressor through the four-way valve. However, since both high-temperature and low-temperature refrigerant flow through the four-way valve, they converge at the valve, resulting in heat loss and poor cooling performance of the air conditioning system. Summary of the Invention

[0004] To overcome the problems existing in related technologies, this disclosure provides an air conditioning system and an air conditioning control method to improve the cooling effect of the air conditioning system.

[0005] According to a first aspect of the present disclosure, an air conditioning system is provided, including a compressor, a four-way valve, a heat exchange assembly, and a first bypass pipe. The compressor has an outlet and an inlet; the four-way valve has a first interface, a second interface, a third interface, and a fourth interface; the heat exchange assembly includes an outdoor heat exchanger and an indoor heat exchanger that are interconnected, both of which are used for heat exchange; the outlet is connected to the first interface, the second interface is connected to the outdoor heat exchanger; the indoor heat exchanger is connected to the third interface, and the fourth interface is connected to the inlet; the compressor, the four-way valve, the indoor heat exchanger, and the outdoor heat exchanger form a circulating loop for refrigerant circulation; the opposite ends of the first bypass pipe are respectively connected to the outlet and the outdoor heat exchanger; the air conditioning system has a cooling mode, and the first bypass pipe is configured in the cooling mode such that at least a portion of the refrigerant output from the outlet can bypass the four-way valve and enter the outdoor heat exchanger through the first bypass pipe.

[0006] The technical solutions provided by the embodiments of this disclosure can include the following beneficial effects: the refrigerant flowing out of the compressor outlet can enter the outdoor heat exchanger through both the four-way valve and the first bypass pipe, wherein the refrigerant flowing out of the outlet has a higher temperature, while the refrigerant flowing towards the inlet has a lower temperature. The refrigerant can simultaneously enter the outdoor heat exchanger through both the four-way valve and the first bypass pipe, increasing the rate and flow of refrigerant delivery to the outdoor heat exchanger and enhancing its heat exchange capacity. The refrigerant can bypass the four-way valve and enter the outdoor heat exchanger through the first bypass pipe, preventing heat loss caused by heat exchange between this portion of the refrigerant and the refrigerant flowing towards the inlet at the four-way valve, resulting in a higher temperature for the refrigerant entering the outdoor heat exchanger, which is beneficial for improving the heat exchange efficiency of the heat exchange components. This allows for a faster reduction in indoor ambient temperature, improving the cooling efficiency and effect of the air conditioning system in cooling mode. In addition, the first bypass pipe provides a bypass flow path for the refrigerant flowing out of the outlet, parallel to the flow through the four-way valve, so that the high-pressure refrigerant flowing out of the outlet can be partially diverted. This can reduce the impact force of the pressurized refrigerant on the four-way valve and help extend the service life of the four-way valve.

[0007] In some disclosed embodiments, the air conditioning system further includes a first pipe and a second pipe, with the opposite ends of the first pipe connected to an outlet and a first interface, respectively, and the opposite ends of the second pipe connected to an outdoor heat exchanger and a second interface, respectively; the opposite ends of the first bypass pipe are connected to the first pipe and the second pipe, respectively.

[0008] The refrigerant flowing out of the outlet can directly and smoothly enter the outdoor heat exchanger through the flow path formed by the first pipe, the first bypass pipe and the second pipe. This allows the refrigerant to be effectively diverted and bypass the four-way valve, enhancing the diversion protection function of the four-way valve, reducing heat loss, increasing the liquid inlet rate and temperature of the outdoor heat exchanger, and thus improving the cooling performance of the air conditioning system.

[0009] In some disclosed embodiments, the first bypass pipe is provided with a first valve body, which is configured to open the first bypass pipe in cooling mode; the air conditioning system has a heating mode, and the first valve body is configured to block the first bypass pipe in heating mode.

[0010] By installing a controllable first valve on the first bypass pipe, precise control over the opening and closing of the first bypass pipe is achieved. In cooling mode, the first valve opens the first bypass pipe, allowing the refrigerant flowing out of the outlet to be effectively diverted and directly enter the outdoor heat exchanger, thereby increasing refrigerant flow, reducing refrigerant heat loss, and protecting the four-way valve. In heating mode, the first valve blocks the first bypass pipe, preventing refrigerant from flowing into it and avoiding interference with the four-way valve's normal control over refrigerant flow.

[0011] In some disclosed embodiments, the air conditioning system has a defrost mode, and the first valve body is configured to open the first bypass pipe in the defrost mode.

[0012] In defrost mode, the first valve body opens the first bypass pipe, allowing the refrigerant flowing out of the outlet to be effectively diverted and directly enter the outdoor heat exchanger, thereby increasing the refrigerant flow, reducing refrigerant heat loss, and protecting the four-way valve. It also allows the refrigerant entering the outdoor heat exchanger to have a higher temperature, which helps to improve defrost efficiency and reduce defrost time.

[0013] In some disclosed embodiments, the air conditioning system further includes a second bypass pipe, the opposite ends of which are connected to the inlet and the outdoor heat exchanger, respectively; the air conditioning system has a defrost mode, in which the refrigerant output from the outlet flows into the outdoor heat exchanger, and the second bypass pipe is configured in the defrost mode so that at least a portion of the refrigerant flowing out of the outdoor heat exchanger can flow back to the inlet from the second bypass pipe, bypassing the indoor heat exchanger.

[0014] By installing a second bypass pipe, the refrigerant flowing out of the outdoor heat exchanger can bypass the indoor heat exchanger and return to the compressor via the second bypass pipe. This prevents the refrigerant from entering the indoor heat exchanger and absorbing heat from the room, thus avoiding a drop in indoor temperature and helping to maintain the indoor environment at the set temperature. Therefore, the second bypass pipe reduces the impact of the air conditioning system on the indoor temperature in defrost mode. When the air conditioning system is used for heating, it improves user comfort, enhances the heating efficiency and effect of the air conditioning system, and reduces the energy consumption of the air conditioning system.

[0015] In some disclosed embodiments, the second bypass pipe is provided with a second valve body, which is configured to open the second bypass pipe in defrost mode; the second valve body is configured to block the second bypass pipe in cooling mode.

[0016] By installing a controllable second valve on the second bypass pipe, precise control over the opening and closing of the second bypass pipe is achieved. In defrost mode, the second valve opens the second bypass pipe, allowing refrigerant flowing from the outdoor heat exchanger to bypass the indoor heat exchanger and flow back to the compressor via the second bypass pipe. This prevents the refrigerant from absorbing heat in the indoor heat exchanger, thus preventing a drop in indoor ambient temperature and maintaining indoor temperature to improve user comfort. In heating and cooling modes, the second valve blocks the second bypass pipe, preventing refrigerant from flowing into it and avoiding interference with the four-way valve's normal control of refrigerant flow.

[0017] In some disclosed embodiments, the air conditioning system further includes a third pipe, with its opposite ends connected to an inlet and a fourth interface, respectively; the heat exchange assembly further includes a connecting pipe, with its opposite ends connected to an outdoor heat exchanger and an indoor heat exchanger, respectively; and the opposite ends of the second bypass pipe are connected to the third pipe and the connecting pipe, respectively.

[0018] In defrost mode, the refrigerant flowing from the outdoor heat exchanger through the connecting pipe can flow directly to the third pipe via the second bypass pipe and then back to the compressor inlet. This path bypasses the indoor heat exchanger, reducing the interference of the defrost process on the indoor ambient temperature and improving the user's comfort in heating mode.

[0019] In some disclosed embodiments, the connecting pipe is equipped with an expansion valve located between the second bypass pipe and the outdoor heat exchanger, so that the refrigerant flowing out of the outdoor heat exchanger flows into the second bypass pipe and / or the indoor heat exchanger after being throttled and depressurized by the expansion valve.

[0020] The above design ensures that all refrigerant returning to the compressor inlet in heating, cooling, and defrosting modes is refrigerant that has been throttled and depressurized by the expansion valve, thus guaranteeing the consistency of the refrigerant state returning to the compressor and improving the coordination and operational reliability of the air conditioning system.

[0021] According to a second aspect of the present disclosure, an air conditioning control method is provided for use in an air conditioning system in any of the above-disclosed embodiments. The air conditioning control method includes the following steps: in response to a cooling mode command, controlling a first bypass pipe to be open, so that at least a portion of the refrigerant output from the outlet can bypass the four-way valve from the first bypass pipe and enter the outdoor heat exchanger.

[0022] Using the above-mentioned air conditioning control method to control the operation of the air conditioning system can reduce the indoor ambient temperature more quickly and improve the heating efficiency and effect of the air conditioning system in cooling mode. In addition, the first bypass pipe provides a bypass flow path for the refrigerant flowing out of the outlet, which is parallel to the flow through the four-way valve. This allows the high-pressure refrigerant flowing out of the outlet to be partially diverted, which can reduce the impact force of the pressurized refrigerant on the four-way valve and help extend the service life of the four-way valve.

[0023] In some disclosed embodiments, when the cooling mode is running for a period of time or when the difference between the indoor ambient temperature and the set temperature is less than a preset value, the first bypass pipe is disconnected, so that all the refrigerant output from the outlet can enter the outdoor heat exchanger through the four-way valve.

[0024] Disconnecting the first bypass pipe can reduce the rate and flow of refrigerant delivered by the compressor to the outdoor heat exchanger, thereby appropriately reducing the heat exchange efficiency of the outdoor heat exchanger. This can reduce the operating load and energy consumption of the air conditioning system while maintaining the indoor ambient temperature.

[0025] In some disclosed embodiments, the air conditioning system has a heating mode; the air conditioning control method includes the following steps: in response to a heating mode command, controlling a first bypass pipe to disconnect.

[0026] The first bypass pipe is disconnected, allowing the four-way valve to control the flow of refrigerant, thereby enabling the air conditioning system to switch between heating and cooling modes.

[0027] In some disclosed embodiments, the air conditioning system has a defrost mode, and the air conditioning system further includes a second bypass pipe, the opposite ends of which are connected to the inlet and the outdoor heat exchanger, respectively; the air conditioning control method includes the following steps: in response to a defrost mode command, controlling the second bypass pipe to be open, so that at least a portion of the refrigerant flowing out of the outdoor heat exchanger can flow back to the inlet from the second bypass pipe, bypassing the indoor heat exchanger.

[0028] By using the above-mentioned air conditioning control method to control the operation of the air conditioning system, the outdoor heat exchanger can be defrosted while reducing interference with the indoor ambient temperature, thereby improving user comfort, enhancing the heating efficiency and effect of the air conditioning system, and reducing the energy consumption of the air conditioning system.

[0029] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0030] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0031] Figure 1 This is a schematic diagram of an air conditioning system according to some embodiments of this disclosure.

[0032] Figure 2 This is a schematic diagram illustrating the refrigerant flow direction of an air conditioning system in cooling mode, based on some embodiments of this disclosure.

[0033] Figure 3 This is a schematic diagram illustrating the refrigerant flow direction of an air conditioning system in defrost mode, based on some embodiments of this disclosure.

[0034] Figure 4 This is a schematic diagram illustrating the refrigerant flow direction of an air conditioning system in heating mode, based on some embodiments of this disclosure.

[0035] Figure 5 This is a flowchart illustrating an air conditioning control method for controlling the cooling of an air conditioning system according to some embodiments of this disclosure.

[0036] Figure 6 This is a flowchart illustrating an air conditioning control method for controlling an air conditioning system in heating mode, based on some embodiments of this disclosure.

[0037] Figure 7 This is a flowchart illustrating an air conditioning control method for controlling the defrosting of an air conditioning system according to some embodiments of this disclosure.

[0038] Explanation of reference numerals in the attached figures:

[0039] 100. Air conditioning system; 10. Compressor; 11. Outlet; 12. Inlet; 20. Four-way valve; 21. First interface; 22. Second interface; 23. Third interface; 24. Fourth interface; 30. Heat exchange assembly; 31. Outdoor heat exchanger; 32. Indoor heat exchanger; 33. Connecting pipe; 331. Expansion valve; 40. First bypass pipe; 41. First valve body; 50. Second bypass pipe; 51. Second valve body; 71. First pipe; 72. Second pipe; 73. Third pipe; 74. Fourth pipe.

[0040] The accompanying drawings have illustrated specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to specific embodiments. Detailed Implementation

[0041] Some embodiments of this disclosure will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. Various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will become apparent upon understanding this disclosure. For example, the order of operations described herein is merely illustrative and is not limited to those orders set forth herein, but can be changed as will become apparent upon understanding this disclosure, except for operations that must be performed in a particular order. Furthermore, for clarity and brevity, descriptions of features known in the art may be omitted.

[0042] Air conditioning systems are widely used in residential split-type air conditioners, cabinet-type air conditioners, multi-split systems, and some light commercial heat pump equipment. Their core function is to switch the refrigerant flow direction in different operating modes, enabling the system to switch between heat absorption and release between the indoor and outdoor sides. In this way, air conditioning systems can regulate the temperature of the space they occupy; specifically, they can cool the indoor environment through cooling mode or heat the indoor environment through heating mode, thus providing users with a comfortable temperature environment.

[0043] In related technologies, a four-way valve is positioned between the compressor and the heat exchange assembly to switch the flow direction of the refrigerant, thereby achieving refrigerant circulation. Specifically, the compressor compresses the refrigerant, raising its temperature and pressure. The refrigerant, after being heated and pressurized, is guided by the four-way valve into the heat exchange assembly for heat exchange. After heat exchange, the temperature and pressure of the refrigerant are reduced, and it is then guided back to the compressor by the four-way valve. Thus, the compressor, four-way valve, and heat exchange assembly form a circulation loop for the refrigerant. The heat exchange assembly typically includes an indoor heat exchanger and an outdoor heat exchanger that are interconnected. The indoor heat exchanger is usually installed indoors, and the outdoor heat exchanger is usually installed outdoors. In cooling mode, the indoor heat exchanger acts as the evaporator side, and the outdoor heat exchanger acts as the condenser side. In heating mode, the four-way valve switches the refrigerant flow direction, turning the indoor heat exchanger into the heat release side and the outdoor heat exchanger into the heat absorption side.

[0044] However, the refrigerant flowing from the compressor through the four-way valve is at a higher temperature, while the refrigerant returning from the heat exchange components to the compressor through the four-way valve is at a lower temperature. Both the higher-temperature and lower-temperature refrigerants flow through the four-way valve and converge at the valve, resulting in heat loss. Furthermore, the four-way valve switches the direction of refrigerant flow by changing the conduction relationship between various interfaces through the valve core. Its internal structure is complex with many bends in the flow channel, which will generate resistance when the refrigerant passes through, causing a drop in refrigerant pressure. Both heat loss and pressure drop of the refrigerant will result in poor heating performance of the air conditioning system.

[0045] To overcome the problems existing in related technologies, this disclosure provides an air conditioning system to improve the cooling effect of the air conditioning system. It includes a compressor, a four-way valve, a heat exchange assembly, and a first bypass pipe. The compressor has an outlet and an inlet; the four-way valve has a first interface, a second interface, a third interface, and a fourth interface; the heat exchange assembly includes an outdoor heat exchanger and an indoor heat exchanger that are interconnected, both of which are used for heat exchange; the outlet is connected to the first interface, the second interface is connected to the outdoor heat exchanger; the indoor heat exchanger is connected to the third interface, and the fourth interface is connected to the inlet; the compressor, the four-way valve, the indoor heat exchanger, and the outdoor heat exchanger form a circulating loop for refrigerant circulation; the opposite ends of the first bypass pipe are respectively connected to the outlet and the outdoor heat exchanger; the air conditioning system has a cooling mode, and the first bypass pipe is configured in the cooling mode so that at least a portion of the refrigerant output from the outlet can bypass the four-way valve and enter the outdoor heat exchanger through the first bypass pipe.

[0046] Compared to related air conditioning systems, the air conditioning system disclosed herein allows the refrigerant flowing out of the outlet to simultaneously enter the outdoor heat exchanger via both the four-way valve and the first bypass pipe. This increases the rate and flow of refrigerant delivery to the outdoor heat exchanger, enhancing its heat exchange capacity. The refrigerant bypassing the four-way valve and entering the outdoor heat exchanger via the first bypass pipe prevents heat loss due to heat exchange between this portion of the refrigerant and the refrigerant flowing towards the inlet at the four-way valve. This results in a higher temperature for the refrigerant entering the outdoor heat exchanger, improving the heat exchange efficiency of the heat exchange components. Consequently, the indoor ambient temperature is reduced more quickly, improving the cooling efficiency and effect of the air conditioning system in cooling mode. Furthermore, the first bypass pipe provides a parallel bypass path for the refrigerant flowing out of the outlet, allowing partial diversion of the high-pressure refrigerant. This reduces the impact force of the pressurized refrigerant on the four-way valve, helping to extend its service life.

[0047] The embodiments described in the following examples of this disclosure are not representative of all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0048] Please refer to Figures 1 to 4 Some embodiments of this disclosure provide an air conditioning system 100, which has a cooling mode, a heating mode, and a defrosting mode, and can be used in household split-type air conditioners or cabinet-type air conditioners. This disclosure does not limit the application of this system. Figure 1 The structure of the air conditioning system 100 is shown. Figure 2 The arrow indicates the direction of refrigerant flow in the air conditioning system 100 during cooling mode. Figure 3 The arrow indicates the direction of refrigerant flow in defrost mode of the air conditioning system 100. Figure 4 The arrow indicates the direction of refrigerant flow in the air conditioning system 100 during heating mode.

[0049] The air conditioning system 100 includes a compressor 10, a four-way valve 20, and a heat exchange assembly 30. The compressor 10 is a power component used to compress the refrigerant and form it into a high-temperature, high-pressure gaseous refrigerant. It provides the air conditioning system 100 with circulating driving force and pressure differential, allowing the refrigerant to continuously flow between the compressor 10, the four-way valve 20, and the heat exchange assembly 30. The compressor 10 has an outlet 11 for refrigerant outflow and an inlet 12 for refrigerant return. The four-way valve 20 is a reversing valve body. The four-way valve 20 has a first port 21, a second port 22, a third port 23 and a fourth port 24. The outlet 11 is connected to the first port 21, the second port 22 is connected to the outdoor heat exchanger 31, the indoor heat exchanger 32 is connected to the third port 23, and the fourth port 24 is connected to the compressor 10 inlet 12. The four-way valve 20 can change the conduction relationship of the refrigerant between the compressor 10 and the heat exchange component 30 by switching the internal flow channel, so that the compressor 10, the four-way valve 20, the indoor heat exchanger 32 and the outdoor heat exchanger 31 together form a circulation loop for the refrigerant to circulate.

[0050] Please refer to Figure 1 The four-way valve 20 can switch between at least two operating states to change the direction of refrigerant flow, enabling the air conditioning system 100 to switch between heating mode, cooling mode, and defrosting mode. Please refer to... Figure 2 When the air conditioning system 100 is in cooling mode, the four-way valve 20 switches to the first conducting state, at which time the first port 21 and the second port 22 are conducting, and the third port 23 and the fourth port 24 are conducting; please refer to... Figure 4 When the air conditioning system 100 is in heating mode, the four-way valve 20 switches to the second conduction state, at which time the first port 21 and the third port 23 are connected, and the second port 22 and the fourth port 24 are connected; please refer to... Figure 3 When the air conditioning system 100 is in defrosting mode, the four-way valve 20 switches to the first conduction state.

[0051] Please refer to Figure 2When the air conditioning system 100 is running in cooling mode, the compressor 10 causes the refrigerant to heat up and pressurize, resulting in a high-temperature, high-pressure gaseous refrigerant, which is defined as the first refrigerant. The first refrigerant flows through the four-way valve 20 to the outdoor heat exchanger 31 for heat exchange and releases heat to the outdoor air. At this time, the temperature of the first refrigerant will decrease, becoming a medium-temperature, high-pressure liquid refrigerant, which is defined as the second refrigerant. The second refrigerant enters the indoor heat exchanger 32 for heat exchange. The indoor heat exchanger 32 absorbs heat from the indoor air, lowering the indoor temperature. The second refrigerant will also absorb heat through evaporation, becoming a low-temperature, low-pressure gaseous refrigerant, which is defined as the third refrigerant. The third refrigerant flows back to the compressor 10 through the four-way valve 20, completing the refrigerant circulation. Since both the higher-temperature first refrigerant and the lower-temperature third refrigerant flow through the four-way valve 20, heat exchange easily occurs between them, resulting in a significant heat loss for the first refrigerant.

[0052] The air conditioning system 100 also includes a first bypass pipe 40, with its opposite ends connected to an outlet 11 and an outdoor heat exchanger 31, respectively. The first bypass pipe 40 is configured to allow at least a portion of the refrigerant output from the outlet 11 to bypass the four-way valve 20 and enter the outdoor heat exchanger 31 in cooling mode.

[0053] By setting the first bypass pipe 40, the first refrigerant can enter the outdoor heat exchanger 31 through both the four-way valve 20 and the first bypass pipe 40, which increases the rate and flow of the first refrigerant into the outdoor heat exchanger 31 and enhances the heat exchange capacity of the outdoor heat exchanger 31. The first refrigerant can bypass the four-way valve 20 and enter the outdoor heat exchanger 31 through the first bypass pipe 40, which avoids heat loss caused by heat exchange between this part of the first refrigerant and the third refrigerant flowing to the inlet 12 at the four-way valve 20. This allows the first refrigerant entering the outdoor heat exchanger 31 to have a higher temperature, which is beneficial to improving the heat exchange efficiency of the heat exchange component 30. In this way, the indoor ambient temperature can be reduced more quickly, and the cooling efficiency and effect of the air conditioning system 100 in cooling mode can be improved.

[0054] In addition, the first refrigerant is a high-temperature and high-pressure gas refrigerant, which will exert a large impact force on the four-way valve 20. The first bypass pipe 40 provides a bypass flow path for the first refrigerant flowing out of the outlet 11, which is parallel to the flow through the four-way valve 20. This allows the high-temperature and high-pressure gas refrigerant flowing out of the outlet 11 to be partially diverted, which can reduce the impact force of the first refrigerant on the four-way valve 20 and help extend the service life of the four-way valve 20.

[0055] In some embodiments, the air conditioning system 100 further includes a first pipe 71 and a second pipe 72. The opposite ends of the first pipe 71 are respectively connected to an outlet 11 and a first interface 21. The opposite ends of the second pipe 72 are respectively connected to an outdoor heat exchanger 31 and a second interface 22. The opposite ends of the first bypass pipe 40 are respectively connected to the first pipe 71 and the second pipe 72.

[0056] The first pipe 71 and the second pipe 72 provide a clear and direct connection point for the first bypass pipe 40, facilitating a reliable connection of the first bypass pipe 40. The first pipe 71, the second pipe 72, and the first bypass pipe 40 together form a pathway in the air conditioning system 100 that allows the first refrigerant to flow directly into the outdoor heat exchanger 31. This diverts the first refrigerant flow, reduces the impact force of the first refrigerant on the four-way valve 20, and also reduces heat loss of the first refrigerant at the four-way valve 20. This improves the liquid inlet rate and temperature of the outdoor heat exchanger 31, thereby enhancing the cooling performance of the air conditioning system 100.

[0057] In some embodiments, the first bypass pipe 40 is provided with a first valve body 41, which is configured to open the first bypass pipe 40 in cooling mode, allowing at least a portion of the first refrigerant to enter the outdoor heat exchanger 31 through the first bypass pipe 40, thereby increasing the refrigerant flow rate, reducing refrigerant heat loss, and protecting the four-way valve 20. The first valve body 41 is configured to block the first bypass pipe 40 in heating mode to prevent the first refrigerant from entering the first bypass pipe 40. This prevents the first bypass pipe 40 from mis-circuiting and interfering with the normal control of the refrigerant flow direction by the four-way valve 20, thus preventing interference with or reduction in efficiency of the heat exchange process of the heat exchange component 30.

[0058] In some embodiments, the first valve body 41 is configured to open the first bypass pipe 40 in defrost mode, so that at least a portion of the first refrigerant can enter the outdoor heat exchanger 31 through the first bypass pipe 40. This can achieve the effects of increasing refrigerant flow, reducing refrigerant heat loss, and protecting the four-way valve 20 in defrost mode, so that the first refrigerant entering the outdoor heat exchanger 31 has a higher temperature, which is beneficial to improving defrost efficiency and reducing defrost time.

[0059] Understandably, the first valve body 41 is an opening and closing control element installed on the first bypass pipe 40, used to selectively open or close the refrigerant passage within the first bypass pipe 40. Exemplarily, the first valve body 41 can be located near the outlet 11, near the outdoor heat exchanger 31, or in the middle of the first bypass pipe 40; this application does not impose any limitations on this. The first valve body 41 can be a solenoid valve, ball valve, gate valve, butterfly valve, or electric proportional valve; this application does not impose any limitations on this.

[0060] Please refer to Figure 4When the air conditioning system 100 is running in heating mode, the compressor 10 causes the refrigerant to heat up and pressurize, resulting in a high-temperature, high-pressure gaseous refrigerant, which is defined as the first refrigerant. The first refrigerant flows through the four-way valve 20 to the indoor heat exchanger 32 for heat exchange and releases heat into the indoor air to provide indoor heating. At this time, the temperature of the first refrigerant will decrease, becoming a medium-temperature, high-pressure liquid refrigerant, which is defined as the second refrigerant. The second refrigerant enters the outdoor heat exchanger 31 for heat exchange. The outdoor heat exchanger 31 absorbs heat from the outdoor air, while the second refrigerant absorbs heat through evaporation, becoming a low-temperature, low-pressure gaseous refrigerant, which is defined as the third refrigerant. The third refrigerant flows back to the compressor 10 through the four-way valve 20, completing the refrigerant circulation. Both the higher-temperature first refrigerant and the lower-temperature third refrigerant flow through the four-way valve 20, which easily causes heat exchange between the first and third refrigerants, resulting in a significant heat loss for the first refrigerant.

[0061] After the air conditioning system 100 has been running in heating mode for a period of time, the outdoor heat exchanger 31 is prone to frost formation. At this time, it is necessary to defrost the outdoor heat exchanger 31 to ensure the normal operation of the air conditioning system 100. In some embodiments, when frost forms on the surface of the outdoor heat exchanger 31, the air conditioning system 100 will automatically switch to defrosting mode.

[0062] Please refer to Figure 3 When the air conditioning system 100 operates in defrost mode, the compressor 10 causes the refrigerant to heat up and pressurize, resulting in a high-temperature, high-pressure gaseous refrigerant, which is defined as the first refrigerant. The first refrigerant is guided through the four-way valve 20 to the outdoor heat exchanger 31 for heat exchange. The heat from the first refrigerant melts the frost on the fins of the outdoor heat exchanger 31, achieving defrosting. At this time, the temperature of the first refrigerant will decrease, becoming a medium-temperature, high-pressure liquid refrigerant, which is defined as the second refrigerant. The second refrigerant enters the indoor heat exchanger 32, evaporates and absorbs heat, and then returns to the compressor 10 through the four-way valve 20. The second refrigerant, upon entering the indoor heat exchanger 32, will evaporate and absorb some heat from the room, causing a decrease in the indoor ambient temperature. This results in a poorer user experience when the air conditioning system 100 is used for heating, and also slows down the heating efficiency and reduces the heating effect of the air conditioning system 100.

[0063] In defrost mode, the first bypass pipe 40 can be opened, allowing the first refrigerant to enter the outdoor heat exchanger 31 simultaneously through both the four-way valve 20 and the first bypass pipe 40. This increases the rate and flow of the first refrigerant delivered to the outdoor heat exchanger 31, enhancing its heat exchange capacity and ensuring the first refrigerant entering the outdoor heat exchanger 31 has a higher temperature, thus improving its heat exchange efficiency. This allows for faster defrosting of the outdoor heat exchanger 31, reducing defrosting time and improving user comfort. Alternatively, the first bypass pipe 40 can be disconnected to save energy consumption in the air conditioning system 100 during the defrosting process.

[0064] The air conditioning system 100 also includes a second bypass pipe 50, with its opposite ends connected to the inlet 12 and the outdoor heat exchanger 31, respectively. Refrigerant discharged from the outlet 11 flows into the outdoor heat exchanger 31 in defrost mode, and the second bypass pipe 50 is configured in defrost mode to allow at least a portion of the refrigerant flowing out of the outdoor heat exchanger 31 to bypass the indoor heat exchanger 32 and flow back to the inlet 12.

[0065] By setting up a second bypass pipe 50, the second refrigerant flowing out of the outdoor heat exchanger 31 can bypass the indoor heat exchanger 32 and flow back to the compressor 10 through the second bypass pipe 50. This prevents the second refrigerant from entering the indoor heat exchanger 32 and absorbing heat from the room, thus avoiding a drop in the indoor ambient temperature and helping to maintain the indoor environment at the set temperature. Therefore, the second bypass pipe 50 can reduce the impact of the air conditioning system 100 on the indoor ambient temperature in defrost mode. When the air conditioning system 100 is used to provide heating for users, it can improve user comfort, enhance the heating efficiency and effect of the air conditioning system 100, and reduce the energy consumption of the air conditioning system 100.

[0066] In some embodiments, the second bypass pipe 50 is provided with a second valve body 51, which is configured to open the second bypass pipe 50 in defrost mode, allowing the second refrigerant to bypass the indoor heat exchanger 32 and flow back to the compressor 10 from the second bypass pipe 50. This prevents the second refrigerant from absorbing heat in the indoor heat exchanger 32, thus preventing a drop in the indoor ambient temperature and achieving the effect of maintaining the indoor temperature and improving user comfort. The second valve body 51 is also configured to block the second bypass pipe 50 in cooling and heating modes to prevent the second refrigerant from entering the third bypass pipe 60. This avoids the second bypass pipe 50 from mis-circuiting and interfering with the normal control of the refrigerant flow direction by the four-way valve 20, thereby preventing it from interfering with or reducing the efficiency of the heat exchange process of the heat exchange component 30.

[0067] Understandably, the second valve body 51 is an opening and closing control element installed on the second bypass pipe 50, used to selectively open or close the refrigerant passage within the second bypass pipe 50. Exemplarily, the second valve body 51 can be located near the inlet 12, near the outdoor heat exchanger 31, or in the middle of the second bypass pipe 50; this application does not impose any limitations on this. The second valve body 51 can be a solenoid valve, ball valve, gate valve, butterfly valve, or electric proportional valve; this application does not impose any limitations on this.

[0068] In some embodiments, the air conditioning system 100 includes a controller (not shown). Both the first valve body 41 and the second valve body 51 can be controlled by the controller according to the operating mode of the air conditioning system 100. The controller can acquire operating status information of the air conditioning system 100 and control the opening and closing of the first valve body 41 and the second valve body 51 based on the operating information.

[0069] For example, when the air conditioning system 100 is operating in heating mode, the controller controls the first valve body 41 and the second valve body 51 to close. When the air conditioning system 100 is operating in cooling mode, the controller controls the second valve body 51 to close and controls the first valve body 41 to open, so as to quickly reduce the indoor temperature. When the air conditioning system 100 is operating in defrost mode, the controller controls the first valve body 41 and the second valve body 51 to open, so as to quickly defrost. In addition, when the air conditioning system 100 operates in cooling mode for a long time until the indoor temperature reaches the set temperature, the controller can also control the first valve body 41 to close, so as to reduce the refrigerant flow rate and velocity output by the compressor 10, thereby reducing the operating load and energy consumption of the air conditioning system 100 while maintaining the indoor temperature.

[0070] By controlling the controller, the opening and closing of the two valves are matched with the operating mode of the air conditioning system 100, so as to ensure that the two bypass pipes only work in the required operating mode. This ensures the precise controllability of the refrigerant flow direction and the consistency of the operating logic when the air conditioning system 100 switches between different modes, and realizes the adaptive adjustment of the refrigerant flow output by the compressor 10.

[0071] In some embodiments, the heat exchange assembly 30 further includes a connecting pipe 33, the opposite ends of which are connected to an outdoor heat exchanger 31 and an indoor heat exchanger 32, respectively, allowing refrigerant to flow between the indoor heat exchanger 32 and the outdoor heat exchanger 31. The connecting pipe 33 is provided with an expansion valve 331, which is located between the second bypass pipe 50 and the outdoor heat exchanger 31, allowing the refrigerant flowing out of the outdoor heat exchanger 31 to flow into the second bypass pipe 50 and / or the indoor heat exchanger 32 after being throttled and depressurized by the expansion valve 331.

[0072] Understandably, when the air conditioning system 100 is operating in defrost mode, the refrigerant flowing out of the outdoor heat exchanger 31 flows into the second bypass pipe 50 after being throttled and depressurized by the expansion valve 331. When the air conditioning system 100 is operating in cooling mode, the refrigerant flowing out of the outdoor heat exchanger 31 flows into the indoor heat exchanger 32 after being throttled and depressurized by the expansion valve 331. When the air conditioning system 100 is operating in heating mode, the refrigerant flowing out of the indoor heat exchanger 32 flows into the outdoor heat exchanger 31 after being throttled and depressurized by the expansion valve 331. This design ensures that all refrigerant returning to the compressor 10 in heating, cooling, and defrost modes is refrigerant that has been throttled and depressurized by the expansion valve 331, guaranteeing the consistency of the refrigerant state returning to the compressor 10 and improving the coordination and operational reliability of the air conditioning system 100.

[0073] The expansion valve 331 is a throttling and pressure-reducing element installed on the connecting pipe 33. It is used to reduce the pressure and regulate the flow of the refrigerant, so that the medium-temperature, high-pressure liquid refrigerant can become a low-temperature, low-pressure liquid refrigerant after throttling and pressure reduction, thereby ensuring that the refrigerant entering the subsequent pipeline meets the heat absorption or release conditions required for the operation of the air conditioning system 100. Exemplarily, the expansion valve 331 can be a thermostatic expansion valve 331, an electronic expansion valve 331, a capillary throttling device, a constant pressure valve, an orifice plate throttling device, or a miniature electronic regulating valve; this application does not impose any limitations on this.

[0074] In some embodiments, the air conditioning system 100 further includes a third conduit 73, the opposite ends of which are connected to the inlet 12 and the fourth interface 24, respectively. The opposite ends of the second bypass pipe 50 are connected to the third conduit 73 and the connecting pipe 33, respectively.

[0075] The third pipe 73 and the connecting pipe 33 provide a clear and direct connection point for the second bypass pipe 50, which facilitates the reliable connection of the second bypass pipe 50. In defrost mode, the refrigerant flowing from the outdoor heat exchanger 31 through the connecting pipe 33 can flow directly to the third pipe 73 via the second bypass pipe 50 and return to the compressor 10 inlet 12. This path bypasses the indoor heat exchanger 32, reducing the interference of the defrost process on the indoor ambient temperature and preventing the refrigerant from flowing into the indoor heat exchanger 32 and causing the indoor ambient temperature to drop, which helps to improve the user's comfort in heating mode.

[0076] Please refer to Figure 1 In some embodiments, the air conditioning system 100 further includes a fourth pipe 74, the opposite ends of which are connected to an indoor heat exchanger 32 and a third interface 23, respectively, so that the four-way valve 20 is connected to the indoor heat exchanger 32, thereby allowing refrigerant to flow between the indoor heat exchanger 32 and the third interface 23.

[0077] Some embodiments of this disclosure also provide an air conditioning control method, which can be used to control the operation of the above-mentioned air conditioning system, thereby changing the indoor ambient temperature.

[0078] When the air conditioning system is used to cool the indoor environment, including step S11, please refer to... Figure 5 .

[0079] S11. In response to the cooling mode command, control the first bypass pipe 40 to open, so that at least part of the refrigerant output from the outlet 11 can bypass the four-way valve 20 from the first bypass pipe 40 and enter the outdoor heat exchanger 31.

[0080] In the cooling mode, the second bypass pipe 50 is disconnected.

[0081] The refrigerant can enter the outdoor heat exchanger 31 through both the four-way valve 20 and the first bypass pipe 40, which increases the rate and flow of refrigerant delivery to the outdoor heat exchanger 31 and enhances the heat exchange capacity of the outdoor heat exchanger 31. At least a portion of the refrigerant can bypass the four-way valve 20 and enter the outdoor heat exchanger 31 through the first bypass pipe 40, avoiding heat loss caused by heat exchange between this portion of the refrigerant and the refrigerant flowing towards the inlet 12 at the four-way valve 20. This results in the refrigerant entering the outdoor heat exchanger 31 having a higher temperature and enhancing the heat exchange efficiency of the outdoor heat exchanger 31. In this way, the indoor ambient temperature can be reduced quickly, improving the heating efficiency and effect of the air conditioning system 100 in cooling mode.

[0082] When an air conditioning system is used to cool an indoor environment, it may also include step S12, please refer to... Figure 5 .

[0083] S12. When the air conditioning system 100 operates in cooling mode for a period of time or when the difference between the indoor ambient temperature and the set temperature is less than the preset value, the first bypass pipe 40 is disconnected, so that all the refrigerant output from the outlet 11 can enter the outdoor heat exchanger 31 through the four-way valve 20.

[0084] After the air conditioning system 100 has been running in cooling mode for a period of time, if the indoor environment reaches the set temperature or the difference between the set temperature and the preset temperature is less than a preset value, the first bypass pipe 40 is disconnected. This reduces the rate and flow of refrigerant supplied by the compressor 10 to the indoor heat exchanger 32, thereby appropriately reducing the heat exchange efficiency of the indoor heat exchanger 32. This maintains the indoor ambient temperature while reducing the operating load and energy consumption of the air conditioning system 100. The preset value can be 1°, 2°, 3°, etc., and this application does not limit this.

[0085] Therefore, by controlling the opening and closing of the first bypass pipe 40, the rate and flow rate of refrigerant flowing into the indoor heat exchanger 32 can be adjusted, thus achieving adaptive regulation of the refrigerant flow rate.

[0086] In some embodiments, the air conditioning system 100 has two power modes: high power and low power. In the high power mode, the first bypass pipe 40 is turned on to quickly reduce the indoor ambient temperature; in the low power mode, the first bypass pipe 40 is turned off to reduce the energy consumption of the air conditioning system 100.

[0087] When the air conditioning system is used to heat the indoor environment, it may also include step S2, please refer to... Figure 6 .

[0088] S2, in response to the heating mode command, controls the first bypass pipe 40 to disconnect.

[0089] In the heating mode, the second bypass pipe 50 is disconnected.

[0090] The refrigerant can enter the indoor heat exchanger 32 through the four-way valve 20, and after flowing through the outdoor heat exchanger 31, it returns to the compressor 10 under the guidance of the four-way valve 20, thereby increasing the indoor ambient temperature and improving the indoor environment. Controlling the first bypass pipe 40 to disconnect allows the four-way valve 20 to control the refrigerant flow, enabling the air conditioning system 100 to switch between heating and cooling modes.

[0091] When the outdoor heat exchanger 31 is frosted, the air conditioning system 100 can be used to defrost the outdoor heat exchanger 31, which may include step S3. Please refer to [link / reference]. Figure 7 .

[0092] S3. In response to the defrost mode command, control the second bypass pipe 50 to be turned on, so that at least part of the refrigerant flowing out of the outdoor heat exchanger 31 can flow back to the inlet 12 from the second bypass pipe 50, bypassing the indoor heat exchanger 32.

[0093] The air conditioning system 100 may cause the outdoor heat exchanger 31 to frost in low-temperature environments; it may also cause the outdoor heat exchanger 31 to frost after operating in heating mode for a period of time. The defrosting mode can be automatically switched by the air conditioning system 100 when it detects that the outdoor heat exchanger 31 is frosted, or it can be switched manually by the user.

[0094] In some embodiments, the first bypass tube 40 is turned on in defrosting mode.

[0095] The refrigerant can enter the outdoor heat exchanger 31 through both the four-way valve 20 and the first bypass pipe 40, which increases the rate and flow of refrigerant delivery to the outdoor heat exchanger 31 and enhances its heat exchange capacity. At least a portion of the refrigerant can bypass the four-way valve 20 and enter the outdoor heat exchanger 31 through the first bypass pipe 40, avoiding heat loss caused by heat exchange between this portion of refrigerant and the refrigerant flowing towards the inlet 12 at the four-way valve 20. This results in a higher temperature for the refrigerant entering the outdoor heat exchanger 31, enhancing its heat exchange efficiency. This allows the outdoor heat exchanger 31 to defrost quickly, reducing defrosting time and improving user comfort.

[0096] In other embodiments, the first bypass pipe 40 in defrost mode can also be disconnected.

[0097] Furthermore, the refrigerant flowing out of the outdoor heat exchanger 31 can bypass the indoor heat exchanger 32 and return to the compressor 10 through the second bypass pipe 50. This prevents the refrigerant from entering the indoor heat exchanger 32 and absorbing heat from the room, thus avoiding a drop in the indoor ambient temperature and helping to maintain the indoor environment at the set temperature. Therefore, the second bypass pipe 50 can reduce the impact of the air conditioning system 100 on the indoor ambient temperature in defrost mode. When the air conditioning system 100 is used to provide heating for users, it can improve user comfort, enhance the heating efficiency and effect of the air conditioning system 100, and reduce the energy consumption of the air conditioning system 100.

[0098] It should be understood that, unless otherwise specifically indicated, features of various embodiments of this disclosure described herein can be combined with each other. As used herein, the term "and / or" includes any one of the relevant listed items and any combination of any two or more.

[0099] It should be understood that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., used in the embodiments of this disclosure should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms herein based on the specific circumstances.

[0100] Although terms such as “first,” “second,” and “third” may be used herein to describe various components or parts, these components or parts are not limited to these terms. Rather, these terms are used only to distinguish one component or part from another. Therefore, without departing from the teachings of the examples described herein, the first valve body, bypass pipe, or conduit mentioned in the examples may also be referred to as the second valve body, bypass pipe, or conduit. Furthermore, the terms “first” and “second” are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as “first” or “second” may explicitly or implicitly include at least one of that feature.

[0101] Furthermore, the term "exemplary" is used in this document to indicate that it serves as an example, instance, or illustration. Any aspect or design described as "exemplary" in this document is not necessarily to be construed as advantageous compared to other aspects or designs. Rather, the use of the term "exemplary" is intended to present concepts in a concrete manner.

[0102] Similarly, although this disclosure has been shown and described with respect to one or more implementations, equivalent variations and modifications will occur to those skilled in the art upon reading and understanding this specification and the accompanying drawings. This disclosure includes all such modifications and variations and is limited only by the scope of the claims. In particular, with respect to the various functions performed by the components described above (e.g., elements, resources, etc.), unless otherwise indicated, the terminology used to describe such components is intended to correspond to any component (functionally equivalent) that performs the specific function of the described component, even if structurally not equivalent to the disclosed structure. Furthermore, although specific features of this disclosure may have been disclosed with respect to only one of several implementations, such features may be combined with one or more other features of other implementations, as may be desired and advantageous to any given or particular application. Moreover, with regard to the terms “comprising,” “having,” “having,” “having,” or variations thereof as used in the detailed description or claims, such terms are intended to be inclusive in a manner similar to the term “including.”

[0103] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0104] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. An air conditioning system, characterized in that, include: The compressor has an outlet and an inlet; The four-way valve has a first port, a second port, a third port and a fourth port; A heat exchange assembly includes an outdoor heat exchanger and an indoor heat exchanger that are interconnected, both of which are used for heat exchange. The outlet is connected to the first interface, the second interface is connected to the outdoor heat exchanger; the indoor heat exchanger is connected to the third interface, the fourth interface is connected to the inlet, and the compressor, the four-way valve, the indoor heat exchanger and the outdoor heat exchanger form a circulation loop for refrigerant circulation. A first bypass pipe, the opposite ends of which are respectively connected to the outlet and the outdoor heat exchanger; The air conditioning system has a cooling mode, and the first bypass pipe is configured in the cooling mode so that at least a portion of the refrigerant output from the outlet can bypass the four-way valve from the first bypass pipe and enter the outdoor heat exchanger.

2. The air conditioning system according to claim 1, characterized in that, The air conditioning system further includes a first pipe and a second pipe, the two ends of the first pipe being connected to the outlet and the first interface, respectively, and the two ends of the second pipe being connected to the outdoor heat exchanger and the second interface, respectively. The two ends of the first bypass pipe are respectively connected to the first pipe and the second pipe.

3. The air conditioning system according to claim 1, characterized in that, The first bypass pipe is provided with a first valve body, which is configured to open the first bypass pipe in cooling mode. The air conditioning system has a heating mode, and the first valve body is configured to block the first bypass pipe in the heating mode.

4. The air conditioning system according to claim 3, characterized in that, The air conditioning system has a defrosting mode, and the first valve body is configured to open the first bypass pipe in the defrosting mode.

5. The air conditioning system according to any one of claims 1 to 4, characterized in that, The air conditioning system also includes a second bypass pipe, the two ends of which are respectively connected to the inlet and the outdoor heat exchanger; The air conditioning system has a defrosting mode, in which the refrigerant output from the outlet flows into the outdoor heat exchanger. The second bypass pipe is configured in the defrosting mode so that at least a portion of the refrigerant flowing out of the outdoor heat exchanger can bypass the indoor heat exchanger and flow back to the inlet via the second bypass pipe.

6. The air conditioning system according to claim 5, characterized in that, The second bypass pipe is provided with a second valve body, which is configured to open the second bypass pipe in defrosting mode; The second valve body is configured to block the second bypass pipe in cooling mode.

7. The air conditioning system according to claim 5, characterized in that, The air conditioning system also includes a third pipe, the two ends of which are respectively connected to the inlet and the fourth interface; The heat exchange assembly also includes a connecting pipe, the two ends of which are respectively connected to the outdoor heat exchanger and the indoor heat exchanger; The two ends of the second bypass pipe are respectively connected to the third pipe and the connecting pipe.

8. The air conditioning system according to claim 7, characterized in that, The connecting pipe is equipped with an expansion valve, which is located between the second bypass pipe and the outdoor heat exchanger, so that the refrigerant flowing out of the outdoor heat exchanger flows into the second bypass pipe and / or the indoor heat exchanger after being throttled and depressurized by the expansion valve.

9. An air conditioning control method, used in an air conditioning system as described in any one of claims 1 to 8, characterized in that, The air conditioning control method includes the following steps: In response to a cooling mode command, the first bypass pipe is opened, allowing at least a portion of the refrigerant output from the outlet to bypass the four-way valve and enter the outdoor heat exchanger.

10. The air conditioning control method according to claim 9, characterized in that, The process includes the following steps: when the cooling mode is running for a period of time or when the difference between the indoor ambient temperature and the set temperature is less than a preset value, the first bypass pipe is disconnected, so that all the refrigerant output from the outlet can enter the outdoor heat exchanger through the four-way valve.

11. The air conditioning control method according to claim 9, characterized in that, The air conditioning system has a heating mode; The air conditioning control method includes the following steps: In response to the heating mode command, the first bypass pipe is disconnected.

12. The air conditioning control method according to any one of claims 9 to 11, characterized in that, The air conditioning system has a defrosting mode, and the air conditioning system also includes a second bypass pipe, the two ends of which are respectively connected to the inlet and the outdoor heat exchanger. The air conditioning control method includes the following steps: In response to a defrost mode command, the second bypass pipe is controlled to open, allowing at least a portion of the refrigerant flowing out of the outdoor heat exchanger to flow back to the inlet via the second bypass pipe, bypassing the indoor heat exchanger.

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