Control method of heat exchange system and heat exchange system

Abstract

The invention relates to the technical field of heat exchange, and particularly discloses a control method of a heat exchange system and the heat exchange system.The heat exchange system comprises a reversing valve set, a compressor, an indoor heat exchanger and an outdoor heat exchanger, and the outdoor heat exchanger comprises a first heat exchange module, a second heat exchanger module and a third heat exchange module; the method is applied to the heat exchange system and comprises the steps that the current heat exchange state and the current operation frequency are obtained, the target working mode of the heat exchange system is determined based on the current heat exchange state and the current operation frequency, and a reversing valve set is controlled based on the target working mode. The refrigerant flow path of each heat exchange module flowing through the outdoor heat exchanger in the heat exchange system is controlled; according to the invention, the reversing valve group in the heat exchange system is subjected to reversing control based on the target working mode of the heat exchange system, so that the refrigerant flow path flowing through each heat exchange module is controlled, the refrigerant flow path is effectively controlled based on different working requirements, and the heat exchange efficiency and the energy-saving efficiency are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchange, and particularly to a control method for a heat exchange system and a heat exchange system. Background Art

[0002] The heat exchange system of an air conditioner includes various different operating conditions, such as rated cooling and rated heating conditions. Under rated cooling and rated heating conditions, the compressor in the heat exchange system generally operates at a high frequency. Under high-temperature heating and low-temperature cooling conditions, the compressor generally operates at a low frequency.

[0003] The current technical solutions only consider the optimal flow path design of the heat exchange system when the air conditioner operates at a high frequency under the two conditions of rated cooling and rated heating, and do not take into account the flow path requirements of the heat exchanger when operating at a low frequency. Therefore, the current heat exchange system cannot meet different application scenarios, resulting in relatively low Annual Performance Factor (APF) and Heating Seasonal Performance Factor (HSPF) of the air conditioner.

[0004] The above content is only used to assist in understanding the technical solution of the present invention, and does not represent an admission that the above content is prior art. Summary of the Invention

[0005] The main purpose of the present invention is to provide a control method for a heat exchange system and a heat exchange system, aiming to solve the technical problem that the prior art cannot effectively take into account heat exchange control under different application scenarios, resulting in low air conditioner performance.

[0006] To achieve the above object, the present invention provides a control method for a heat exchange system. The heat exchange system includes a reversing valve group, a compressor, an indoor heat exchanger, and an outdoor heat exchanger. The outdoor heat exchanger includes a first heat exchange module, a second heat exchanger module, and a third heat exchange module;

[0007] The reversing valve group includes at least five ports. Four of the ports of the reversing valve group are respectively connected to the exhaust port of the compressor, the suction port of the compressor, one end of the first heat exchange module, and the indoor heat exchanger. Another port of the reversing valve group is connected to one end of the second heat exchange module and the third heat exchange module;

[0008] The other end of the first heat exchange module, the other end of the second heat exchanger module, and the other end of the third heat exchange module are all connected to the indoor heat exchanger;

[0009] The method includes the following steps:

[0010] Obtain the current heat exchange state of the indoor heat exchanger and the current operating frequency of the compressor;

[0011] Determine the target operating mode of the heat exchange system based on the current heat exchange state and the current operating frequency; and

[0012] Control the control valve and the four-way valve respectively based on the target operating mode to control the refrigerant flow path flowing through each heat exchange module in the outdoor heat exchanger in the heat exchange system.

[0013] Optionally, the reversing valve group includes a four-way valve and a switching valve;

[0014] The four ports of the four-way valve are respectively connected to the exhaust port of the compressor, the suction port of the compressor, one end of the first heat exchange module, and the indoor heat exchanger;

[0015] The switching valve includes at least three ports. Two of the ports of the switching valve are respectively connected to the exhaust port of the compressor and the suction port of the compressor, and the other port of the switching valve is connected to one end of the second heat exchange module and the third heat exchange module;

[0016] The controlling the reversing valve group based on the target operating mode to control the refrigerant flow path flowing through each heat exchange module in the outdoor heat exchanger in the heat exchange system further includes:

[0017] Control the four-way valve and / or the switching valve based on the target operating mode to control the refrigerant flow path flowing through each heat exchange module in the outdoor heat exchanger in the heat exchange system.

[0018] Optionally, the target operating mode includes the rated cooling mode, the first heating mode, and the second heating mode.

[0019] Optionally, the reversing system further includes a control valve, and the control valve is connected between the connection end of the first heat exchange module and the second heat exchange module and the connection end of the third heat exchange module and the indoor heat exchanger;

[0020] When the target operating mode is the rated cooling mode, the controlling the four-way valve and the switching valve respectively includes:

[0021] Control the control valve to close, the switching valve to lose power, and the four-way valve to lose power to control the refrigerant flow path flowing through each heat exchange module in the outdoor heat exchanger in the heat exchange system.

[0022] Optionally, when the target operating mode is the first heating mode, the controlling the four-way valve and the switching valve respectively includes:

[0023] Control the opening of the control valve, the energization of the switching valve, and the energization of the four-way valve to control the refrigerant flow path flowing through each heat exchange module in the outdoor heat exchanger in the heat exchange system.

[0024] Optionally, when the target operating mode is the second heating mode, the controlling of the four-way valve and the switching valve respectively includes:

[0025] Control the closing of the control valve, the de-energization of the switching valve, and the energization of the four-way valve to control the refrigerant flow path flowing through each heat exchange module in the outdoor heat exchanger in the heat exchange system.

[0026] In addition, to achieve the above object, the present invention further provides a heat exchange system, which includes a reversing valve group, a compressor, an indoor heat exchanger, and an outdoor heat exchanger. The outdoor heat exchanger includes a first heat exchange module, a second heat exchange module, and a third heat exchange module;

[0027] The reversing valve group includes at least five ports. Four of the ports of the reversing valve group are respectively connected to the exhaust port of the compressor, the suction port of the compressor, one end of the first heat exchange module, and the indoor heat exchanger. Another port of the reversing valve group is connected to one end of the second heat exchange module and the third heat exchange module;

[0028] The other end of the first heat exchange module, the other end of the second heat exchange module, and the other end of the third heat exchange module are all connected to the indoor heat exchanger.

[0029] Optionally, the reversing valve group includes a four-way valve and a switching valve;

[0030] The four ports of the four-way valve are respectively connected to the exhaust port of the compressor, the suction port of the compressor, one end of the first heat exchange module, and the indoor heat exchanger;

[0031] The switching valve includes at least three ports. Two of the ports of the switching valve are respectively connected to the exhaust port of the compressor and the suction port of the compressor. Another port of the switching valve is connected to one end of the second heat exchange module and the third heat exchange module.

[0032] Optionally, the reversing system further includes a control valve, and the control valve is connected between the connection end of the first heat exchange module and the second heat exchange module and the connection end of the third heat exchange module and the indoor heat exchanger.

[0033] Optionally, the heat exchange system further includes a first check valve, and the first check valve is connected between the connection end of the first heat exchange module and the second heat exchange module and the control valve, or the first check valve is connected between the connection end of the third heat exchange module and the indoor heat exchanger and the control valve;

[0034] The conducting direction of the first one-way valve is from the connection end of the third heat exchange module and the indoor heat exchanger to the connection end of the first heat exchange module and the second heat exchange module.

[0035] Optionally, the connection ports of the reversing valve group with the second heat exchange module and the third heat exchange module are defined as the first connection ports, the ports of the second heat exchange module and the third heat exchange module after connection and connected to the first connection ports are defined as the second connection ports. The heat exchange system further includes a second one-way valve, the second one-way valve is connected between the first connection port and the second connection port, and the conducting direction of the second one-way valve is from the second connection port to the first connection port.

[0036] By obtaining the current heat exchange state of the indoor heat exchanger and the operating frequency of the compressor, the present invention identifies the target working mode of the heat exchange system, controls the control valves in the heat exchange system based on the target working mode of the heat exchange system, thereby realizing the control of the refrigerant flow path flowing through each heat exchange module, effectively controlling the refrigerant flow path flowing through each heat exchange module in the heat exchange system based on different working requirements, thereby improving the heat exchange efficiency and energy-saving efficiency, and thereby realizing the control of the number and length of the refrigerant flow paths in different heat exchange application scenarios, effectively meeting the heat exchange requirements in different scenarios. Description of the Drawings

[0037] Figure 1 It is a schematic flowchart of the first embodiment of the control method of the heat exchange system of the present invention;

[0038] Figure 2 It is a schematic structural diagram of the heat exchange system in an embodiment of the present invention;

[0039] Figure 3 It is a schematic flowchart of the second embodiment of the control method of the heat exchange system of the present invention;

[0040] Figure 4 It is a schematic diagram of the refrigerant flow when the heat exchange system is in the first heating mode in an embodiment of the present invention;

[0041] Figure 5 It is a schematic diagram of the refrigerant flow when the heat exchange system is in the second heating mode in an embodiment of the present invention.

[0042] Explanation of the Reference Numerals in the Drawings:

[0043] Label Name Label Name 1 First heat exchange module 2 Second heat exchange module 3 Third heat exchange module 4 First one-way valve 5 Control valve 6 Switching valve 7 Second one-way valve 8 Four-way valve 9 Compressor 10 Indoor heat exchanger 11 Electronic expansion valve 12 Outdoor heat exchanger

[0044] The realization of the object, functional features and advantages of the present invention will be further described in conjunction with the embodiments and with reference to the drawings. Detailed Embodiments

[0045] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0046] The core of this application is to provide a control method for a heat exchange system and a heat exchange system, aiming to solve the problem that the prior art cannot effectively balance heat exchange control in different application scenarios, resulting in low air conditioner performance.

[0047] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are some, but not all, of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of this application without creative efforts shall fall within the scope of protection of this application.

[0048] The embodiments of the present invention provide a control method for a heat exchange system. Refer to Figure 1 , Figure 1 which is a schematic flowchart of the first embodiment of a control method for a heat exchange system of the present invention.

[0049] In this embodiment, the control method for the heat exchange system includes the following steps:

[0050] Step S10: Obtain the current heat exchange state of the indoor heat exchanger and the current operating frequency of the compressor.

[0051] It should be understood that the execution subject of this embodiment is a controller, mainly a controller connected to the heat exchange system, which can be a device capable of controlling the power-on state, opening degree, adjustment, and switching of each component of the heat exchange system, and can perform data processing and transmission, or other devices that can achieve this function. This embodiment does not limit this.

[0052] It should be noted that the control method for the heat exchange system in this embodiment is applied to the heat exchange system. Refer to Figure 2 , Figure 2 which is a schematic structural diagram of the heat exchange system. The heat exchange system includes an outdoor heat exchanger 12, a first one-way valve 4, a control valve 5, a switching valve 6, a second one-way valve 7, a four-way valve 8, a compressor 9, an electronic expansion valve 11, and an indoor heat exchanger 10.

[0053] It should be noted that the outdoor heat exchanger 12 includes a first heat exchange module 1, a second heat exchange module 2, and a third heat exchange module 3. The reversing valve group can be a valve group composed of a five-way valve, a six-way valve, a four-way valve, and a three-way valve, or a valve group composed of two four-way valves. The control valve 5 can be an electromagnetic control valve, such as a two-way valve, a solenoid valve, a switching valve, etc. The switching valve 6 can be an electromagnetic switching valve, such as a three-way valve, etc. The four-way valve 8 can be an electromagnetic four-way valve.

[0054] It can be understood that referring to Figure 2 , the compressor 9 includes a refrigerant exhaust port and a refrigerant suction port. The exhaust port is connected with a first branch and a second branch. The first branch is connected with the switching valve 6, and the second branch is connected with the four-way valve 8.

[0055] It should be understood that as Figure 2 shown, the first port of the four-way valve 8 is connected with the second branch of the refrigerant exhaust port of the above-mentioned compressor 9, the second port is connected with the first heat exchange module 1 in the outdoor heat exchanger 12, the third port is connected with the refrigerant suction port of the compressor 9, and the fourth port is connected with the indoor heat exchanger 10; the first port of the above-mentioned switching valve 6 is connected with the first branch of the refrigerant exhaust port of the compressor 9, the second port is connected with the second heat exchange module 2 and the third heat exchange module 3 through the second check valve 7, and the third port is respectively connected with the third port of the four-way valve 8 and the refrigerant suction port of the compressor 9; one end of the above-mentioned control valve 5 is respectively connected with the first heat exchange module 1 and the second heat exchange module 2 through the first check valve 4, and the other end is respectively connected with the third heat exchange module 3 and the electronic expansion valve 11.

[0056] It can be understood that referring to Figure 2 , one end of the first heat exchange module 1 is connected with the second port of the four-way valve 8, and the other end is respectively connected with the second heat exchange module 2 and the first check valve 4; one end of the second heat exchange module 2 is respectively connected with the second check valve 7 and the third heat exchange module 3, and the other end is respectively connected with the first heat exchange module 1 and the first check valve 4; one end of the third heat exchange module 3 is respectively connected with the second heat exchange module 2 and the second check valve 7, and the other end is respectively connected with the control valve 5 and the electronic expansion valve 11; the electronic expansion valve 11 is respectively connected with the third heat exchange module 3 and the indoor heat exchanger 10, and the indoor heat exchanger 10 is respectively connected with the four-way valve 8 and the electronic expansion valve 11.

[0057] It should be noted that the above-mentioned current heat exchange state can be the heat exchange state of the heat exchange system. The heat exchange state can include a refrigeration state and a heating state. The heat exchanger can be used to transfer heat to increase or decrease the temperature of an object or medium. When the heat exchanger absorbs heat from a heat source and transfers it to a cooling medium, it is in the refrigeration state. And when the heat exchanger absorbs heat from a cooling medium and transfers it to a heated medium, it is in the heating state. The above-mentioned operating frequency can include high-frequency operation and low-frequency operation.

[0058] Step S20: Determine the target operating mode of the heat exchange system based on the current heat exchange state and the current operating frequency.

[0059] It should be noted that the above target operating mode may include the rated cooling mode, the rated heating mode, and the low-frequency heating mode. The above rated cooling mode may be a mode of high-frequency cooling in a low-temperature environment; the above rated heating mode may be a mode of high-frequency heating in a low-temperature environment; the above low-frequency heating mode may be a mode of heating in a high-temperature environment.

[0060] Step S30: Control the reversing valve group based on the target operating mode to control the refrigerant flow path flowing through each heat exchange module in the outdoor heat exchanger in the heat exchange system.

[0061] It should be noted that the above heat exchange modules may be the first heat exchange module 1, the second heat exchange module 2, and / or the third heat exchange module 3 in the outdoor heat exchanger 12, and the above target operating mode may include the rated cooling mode, the rated heating mode, and the low-frequency heating mode.

[0062] In some embodiments, the above first heat exchange module may be the upper heat exchanger, the above second heat exchange module may be the lower heat exchanger, and the above third heat exchange module may be the subcooling coil.

[0063] It should be understood that in the rated cooling mode of the heat exchange system, the four-way valve 8 in the heat exchange system is de-energized and the control valve 5 is closed. At this time, the heat exchanger acts as a condenser, and the refrigerant flow path is less and the process is longer, which conforms to the principle of efficient heat exchange of the condenser.

[0064] It can be understood that in the rated heating mode of the heat exchange system, the four-way valve 8 in the heat exchange system is energized and the control valve 5 is opened. At this time, the compressor 9 operates at a higher frequency, and the heat exchanger acts as an evaporator. The refrigerant flow path is more and the process is shorter, which meets the requirements of efficient heat exchange.

[0065] It should be understood that in the low-frequency heating mode of the heat exchange system, the four-way valve 8 is energized and the control valve 5 is closed. At this time, the compressor 9 operates at a lower frequency, and the heat exchanger acts as an evaporator. The refrigerant flow path is less and the process is longer, which meets the requirements of efficient heat exchange.

[0066] In specific implementation, the controller can control the working states of the control valve and the four-way valve in the heat exchange system based on a pre-set first mapping function mode table. The first mapping function mode table is shown in Table 1 below.

[0067]

[0068] Table 1, First mapping function mode table

[0069] In this embodiment, by obtaining the current heat exchange state of the indoor heat exchanger and the operating frequency of the compressor, the target operating mode of the heat exchange system is identified, and the control valve in the heat exchange system is controlled based on the target operating mode of the heat exchange system, so as to control the refrigerant flow path flowing through each heat exchange module, effectively control the refrigerant flow path flowing through each heat exchange module in the heat exchange system according to different working requirements, thereby improving the heat exchange efficiency and energy-saving efficiency, and realizing the control of the number and length of the refrigerant flow paths in different heat exchange application scenarios, effectively meeting the heat exchange requirements in different scenarios.

[0070] Reference Figure 3 , Figure 3 is a schematic flow chart of the second embodiment of a control method for a heat exchange system according to the present invention.

[0071] Based on the above first embodiment, in this embodiment, the step S30 includes:

[0072] Step S31: Control the four-way valve and / or the switching valve based on the target operating mode to control the refrigerant flow path flowing through each heat exchange module in the outdoor heat exchanger in the heat exchange system.

[0073] It should be noted that the reversing valve group may include a switching valve 6 and a four-way valve 8. The four ports of the four-way valve are respectively connected to the exhaust port of the compressor, the suction port of the compressor, one end of the first heat exchange module, and the indoor heat exchanger;

[0074] The switching valve includes at least three ports. Two of the ports of the switching valve are respectively connected to the exhaust port of the compressor and the suction port of the compressor, and the other port of the switching valve is connected to one end of the second heat exchange module and the third heat exchange module.

[0075] It should be noted that the control method of the heat exchange system in this embodiment is applied to the heat exchange system. Refer to Figure 2 , Figure 2 is a schematic structural diagram of the heat exchange system. The heat exchange system includes an outdoor heat exchanger 12, a first check valve 4, a control valve 5, a switching valve 6, a second check valve 7, a four-way valve 8, a compressor 9, an electronic expansion valve 11, and an indoor heat exchanger 10. The outdoor heat exchanger 12 includes a first heat exchange module 1, a second heat exchange module 2, and a third heat exchange module 3. The control valve 5 may be an electromagnetic control valve 5. The switching valve 6 may be an electromagnetic switching valve, such as an electromagnetic three-way valve. The four-way valve 8 may be an electromagnetic four-way valve 8.

[0076] It can be understood that, referring to Figure 2, the compressor 9 includes a refrigerant discharge port and a refrigerant suction port. The discharge port is connected to a first branch and a second branch. The first branch is connected to the switching valve 6, and the second branch is connected to the four-way valve 8.

[0077] It should be understood that, as Figure 2 shown, the first port of the four-way valve 8 is connected to the second branch of the refrigerant discharge port of the above-mentioned compressor 9, the second port is connected to the first heat exchange module 1 in the outdoor heat exchanger 12, the third port is connected to the refrigerant suction port of the compressor 9, and the fourth port is connected to the indoor heat exchanger 10; the first port of the above-mentioned switching valve 6 is connected to the first branch of the refrigerant discharge port of the compressor 9, the second port is connected to the second heat exchange module 2 and the third heat exchange module 3 through the second one-way valve 7, and the third port is respectively connected to the third port of the four-way valve 8 and the refrigerant suction port of the compressor 9; one end of the above-mentioned control valve 5 is respectively connected to the first heat exchange module 1 and the second heat exchange module 2 through the first one-way valve 4, and the other end is respectively connected to the third heat exchange module 3 and the electronic expansion valve 11.

[0078] It can be understood that, referring to Figure 2 , one end of the first heat exchange module 1 is connected to the second port of the four-way valve 8, and the other end is respectively connected to the second heat exchange module 2 and the first one-way valve 4; one end of the second heat exchange module 2 is respectively connected to the second one-way valve 7 and the third heat exchange module 3, and the other end is respectively connected to the first heat exchange module 1 and the first one-way valve 4; one end of the third heat exchange module 3 is respectively connected to the second heat exchange module 2 and the second one-way valve 7, and the other end is respectively connected to the control valve 5 and the electronic expansion valve 11; the electronic expansion valve 11 is respectively connected to the third heat exchange module 3 and the indoor heat exchanger 10, and the indoor heat exchanger 10 is respectively connected to the four-way valve 8 and the electronic expansion valve 11.

[0079] Further, in order to meet the heat exchange control under different application scenarios, the target operating modes include the rated cooling mode, the first heating mode, and the second heating mode.

[0080] It should be understood that in the rated cooling mode of the heat exchange system, the four-way valve 8 in the heat exchange system is de-energized, the switching valve 6 is de-energized, and the control valve 5 is closed. At this time, the heat exchanger acts as a condenser, and the refrigerant flow path is less and the flow length is longer, which conforms to the principle of efficient heat exchange of the condenser.

[0081] It can be understood that in the rated heating mode of the heat exchange system, the four-way valve 8 in the heat exchange system is energized, the switching valve 6 is energized, and the control valve 5 is opened. At this time, the compressor 9 operates at a higher frequency, and the heat exchanger acts as an evaporator, and the refrigerant flow path is more and the flow length is shorter, which meets the requirements of efficient heat exchange.

[0082] It should be understood that in the low-frequency heating mode of the heat exchange system, the four-way valve 8 is energized, the switching valve 6 is de-energized, and the control valve 5 is closed. At this time, the frequency of the compressor 9 runs relatively low, and the heat exchanger acts as an evaporator with fewer refrigerant flow paths and a longer flow path, meeting the requirements of efficient heat exchange.

[0083] In a specific implementation, the controller can control the working states of the control valve, the switching valve, and the four-way valve in the heat exchange system based on a pre-set second mapping function mode table, and the second mapping function mode table is shown in Table 2 below.

[0084]

[0085] Table 2, Second Mapping Function Mode Table

[0086] Furthermore, when the target working mode is the rated cooling mode, in order to improve the heat exchange efficiency of the cooling mode, the above step S31 may include:

[0087] Step S311: Control the control valve to close, the switching valve to be de-energized, and the four-way valve to be de-energized to control the refrigerant flow paths flowing through each heat exchange module in the outdoor heat exchanger in the heat exchange system.

[0088] It should be noted that the commutation system further includes a control valve, and the control valve is connected between the connection end of the first heat exchange module and the second heat exchange module and the connection end of the third heat exchange module and the indoor heat exchanger.

[0089] It can be understood that the above-mentioned rated cooling mode can be a high-frequency cooling mode, that is, the cooling mode in a high-temperature environment. At this time, the four-way valve 8 of the heat exchange system is de-energized, the switching valve 6 is de-energized, and the control valve 5 is closed.

[0090] It should be understood that referring to Figure 2 , Figure 2 , the implementation arrows represent the refrigerant flow direction. The refrigerant is discharged from the compressor 9 and flows to the switching valve 6 and the four-way valve 8 from the first branch and the second branch respectively. The refrigerant in the first branch is blocked by the first one-way valve 4 at the switching valve 6 and cannot flow. The refrigerant in the second branch enters the outdoor heat exchanger 12, first passes through the first heat exchange module 1, and then is blocked by the second one-way valve 7, so it flows to the second heat exchange module 2, then passes through the third heat exchange module 3, then enters the electronic expansion valve 11, enters the indoor heat exchanger 10, then flows through the four-way valve 8, and finally enters the compressor 9 to complete the cycle. At this time, the heat exchanger acts as a condenser, and the refrigerant flow paths are fewer and the flow path is longer, meeting the principle of efficient heat exchange of the condenser.

[0091] Furthermore, when the target working mode is the first heating mode, in order to reduce the flow paths and improve the heating heat exchange efficiency, the above step S31 may include:

[0092] Step S312: Control the control valve to open, the switching valve to be energized, and the four-way valve to be energized to control the refrigerant flow path flowing through each heat exchange module in the outdoor heat exchanger in the heat exchange system.

[0093] It should be noted that the first heating mode can be the rated heating mode, that is, the high-frequency heating mode in a low-temperature environment. At this time, control the four-way valve 8 to be energized, the switching valve 6 to be energized, and the control valve 5 to open.

[0094] It should be understood that referring to Figure 4 , Figure 4 is a schematic diagram of the refrigerant flow in the first heating mode. The refrigerant is discharged from the compressor 9, and is divided into a first branch and a second branch and flows to the switching valve 6 and the four-way valve 8 respectively. The capillary tube assembly in the switching valve 6 blocks the first branch and cannot flow. The refrigerant in the second branch enters the indoor heat exchanger 10, then passes through the electronic expansion valve 11, and then enters the outdoor heat exchanger 12. Since the control valve 5 is in the open state, the refrigerant can be divided into 3 paths and enter the first heat exchange module 1, the second heat exchange module 2, and the third heat exchange module 3 of the outdoor heat exchanger 12 respectively. After that, it passes through the switching valve 6 and the four-way valve 8 and then converges and enters the compressor 9 to complete the cycle. At this time, the heat exchanger acts as a condenser, and the refrigerant flow path is less and the flow path is longer, which conforms to the principle of efficient heat exchange of the condenser.

[0095] Further, when the target operating mode is the second heating mode, in order to improve the low-frequency heating efficiency, the above step S31 can include:

[0096] Step S313: Control the control valve to close, the switching valve to lose power, and the four-way valve to be energized to control the refrigerant flow path flowing through each heat exchange module in the outdoor heat exchanger in the heat exchange system.

[0097] It should be noted that the second heating mode can be the low-frequency heating mode, that is, the heating mode in a high-temperature environment. At this time, control the four-way valve 8 to be energized, the switching valve 6 to lose power, and the control valve 5 to close.

[0098] It should be understood that referring to Figure 5 , Figure 5Schematic diagram of refrigerant flow in the second heating mode. The refrigerant is discharged from the exhaust port of the compressor 9 and is divided into a first branch and a second branch, flowing to the switching valve 6 and the four-way valve 8 respectively. The refrigerant in the first branch is blocked by the first one-way valve 4 at the switching valve 6 and cannot flow. The refrigerant in the second branch enters the indoor heat exchanger 10, then passes through the electronic expansion valve 11, and then enters the outdoor heat exchanger 12. Since the control valve 5 is in the closed state, the refrigerant can only flow through the third heat exchange module 3 first, then enter the second heat exchange module 2, and then flow through the first heat exchange module 1 to complete the heat exchange. After that, it passes through the four-way valve 8 and then enters the compressor 9 to complete the cycle. At this time, the frequency of the compressor 9 runs relatively low, and the heat exchanger acts as an evaporator. The refrigerant flow path is less and the process is longer, meeting the requirements of efficient heat exchange.

[0099] In this embodiment, the control valve, the switching valve, and the four-way valve in the heat exchange system are controlled based on the target working mode of the heat exchange system, so as to control the refrigerant flow path flowing through each heat exchange module, effectively control the refrigerant flow path flowing through each heat exchange module in the heat exchange system based on different working requirements, thereby improving the heat exchange efficiency and energy-saving efficiency, and realizing the control of the number and length of the refrigerant flow path in different heat exchange application scenarios, effectively meeting the heat exchange requirements in different scenarios.

[0100] In addition, an embodiment of the present invention also proposes a heat exchange system, and the control method of the heat exchange system in the above embodiment is applied to the heat exchange system in this embodiment.

[0101] Refer to Figure 2 , Figure 2 which is a schematic diagram of the structure of the heat exchange system in this embodiment. The heat exchange system includes a reversing valve group, a compressor 9, an indoor heat exchanger 10, and an outdoor heat exchanger 12. The outdoor heat exchanger 12 includes a first heat exchange module 1, a second heat exchanger module, and a third heat exchange module 3;

[0102] The reversing valve group includes at least five ports. Four of the ports of the reversing valve group are respectively connected to the exhaust port of the compressor 9, the suction port of the compressor 9, one end of the first heat exchange module 1, and the indoor heat exchanger 10. The other port of the reversing valve group is connected to one end of the second heat exchange module 2 and the third heat exchange module 3;

[0103] The other end of the first heat exchange module 1, the other end of the second heat exchanger module, and the other end of the third heat exchange module 3 are all connected to the indoor heat exchanger 10.

[0104] Further, in order to accurately control the refrigerant flow path in the outdoor heat exchanger 12 to achieve different heat exchange effects in different scenarios, the reversing valve group includes a four-way valve 8 and a switching valve 6;

[0105] The four ports of the four-way valve 8 are respectively connected to the exhaust port of the compressor 9, the suction port of the compressor 9, one end of the first heat exchange module 1, and the indoor heat exchanger 10;

[0106] The switching valve 6 includes at least three ports. Two of the ports of the switching valve 6 are respectively connected to the exhaust port of the compressor 9 and the suction port of the compressor 9, and the other port of the switching valve 6 is connected to one end of the second heat exchange module 2 and the third heat exchange module 3.

[0107] Further, the commutation system further includes a control valve 5, and the control valve 5 is connected between the connection end of the first heat exchange module 1 and the second heat exchange module 2 and the connection end of the third heat exchange module 3 and the indoor heat exchanger 10.

[0108] Further, the heat exchange system further includes a first check valve 4, and the first check valve 4 is connected between the connection end of the first heat exchange module 1 and the second heat exchange module 2 and the control valve 5, or the first check valve 4 is connected between the connection end of the third heat exchange module 3 and the indoor heat exchanger 10 and the control valve 5;

[0109] The conducting direction of the first check valve 4 is from the connection end of the third heat exchange module 3 and the indoor heat exchanger 10 to the connection end of the first heat exchange module 1 and the second heat exchange module 2.

[0110] Further, the connection ports of the commutation valve group with the second heat exchange module 2 and the third heat exchange module 3 are defined as the first connection port, the port of the second heat exchange module 2 and the third heat exchange module 3 after connection and connected to the first connection port is defined as the second connection port. The heat exchange system further includes a second check valve 7, and the second check valve 7 is connected between the first connection port and the second connection port. The conducting direction of the second check valve 7 is from the second connection port to the first connection port.

[0111] It should be noted that the outdoor heat exchanger 12 includes the first heat exchange module 1, the second heat exchange module 2, and the third heat exchange module 3. The commutation valve group can be a valve group composed of a five-way valve, a six-way valve, a four-way valve, and a three-way valve, or a valve group composed of two four-way valves. The control valve 5 can be an electromagnetic control valve, such as a two-way valve, a solenoid valve, a switching valve, etc. The switching valve 6 can be an electromagnetic switching valve, such as a three-way valve, etc. The four-way valve 8 can be an electromagnetic four-way valve.

[0112] It can be understood that with reference to Figure 2, the compressor 9 includes a refrigerant exhaust port and a refrigerant suction port. The exhaust port is connected to a first branch and a second branch. The first branch is connected to the switching valve 6, and the second branch is connected to the four-way valve 8.

[0113] It should be understood that, as Figure 2 shown, the first port of the four-way valve 8 is connected to the second branch of the refrigerant exhaust port of the above-mentioned compressor 9, the second port is connected to the first heat exchange module 1 in the outdoor heat exchanger 12, the third port is connected to the refrigerant suction port of the compressor 9, and the fourth port is connected to the indoor heat exchanger 10; the first port of the above-mentioned switching valve 6 is connected to the first branch of the refrigerant exhaust port of the compressor 9, the second port is connected to the second heat exchange module 2 and the third heat exchange module 3 through the second one-way valve 7, and the third port is respectively connected to the third port of the four-way valve 8 and the refrigerant suction port of the compressor 9; one end of the above-mentioned control valve 5 is respectively connected to the first heat exchange module 1 and the second heat exchange module 2 through the first one-way valve 4, and the other end is respectively connected to the third heat exchange module 3 and the electronic expansion valve 11.

[0114] It can be understood that, referring to Figure 2 , one end of the first heat exchange module 1 is connected to the second port of the four-way valve 8, and the other end is respectively connected to the second heat exchange module 2 and the first one-way valve 4; one end of the second heat exchange module 2 is respectively connected to the second one-way valve 7 and the third heat exchange module 3, and the other end is respectively connected to the first heat exchange module 1 and the first one-way valve 4; one end of the third heat exchange module 3 is respectively connected to the second heat exchange module 2 and the second one-way valve 7, and the other end is respectively connected to the control valve 5 and the electronic expansion valve 11; the electronic expansion valve 11 is respectively connected to the third heat exchange module 3 and the indoor heat exchanger 10, and the indoor heat exchanger 10 is respectively connected to the four-way valve 8 and the electronic expansion valve 11.

[0115] It should be noted that in the high-frequency refrigeration mode (i.e., high-temperature refrigeration), the four-way valve 8 is de-energized, the switching valve 6 is de-energized, and the control valve 5 is closed.

[0116] It should be understood that, referring to Figure 2 , Figure 2 , the implementation arrows in it represent the refrigerant flow direction. In the high-frequency refrigeration mode, the refrigerant is discharged from the compressor 9, and flows to the switching valve 6 and the four-way valve 8 from the first branch and the second branch respectively. The refrigerant in the first branch is blocked by the first one-way valve 4 at the switching valve 6 and cannot flow. The refrigerant in the second branch enters the outdoor heat exchanger 12, first passes through the first heat exchange module 1, and then is blocked by the second one-way valve 7, so it flows to the second heat exchange module 2, then passes through the third heat exchange module 3, then enters the electronic expansion valve 11, enters the indoor heat exchanger 10, then flows through the four-way valve 8, and finally enters the compressor 9 to complete the cycle. At this time, the heat exchanger acts as a condenser, and the refrigerant flow path is less and the flow process is longer, which conforms to the principle of efficient heat exchange of the condenser.

[0117] It should be noted that in the high-frequency heating mode under low-temperature environment, the four-way valve 8 is energized, the switching valve 6 is energized, and the control valve 5 is opened.

[0118] It should be understood that referring to Figure 4 , Figure 4 is the schematic diagram of refrigerant flow for the first heating mode (i.e., high-frequency heating mode), where the solid arrows represent the refrigerant flow direction. The refrigerant is discharged from the compressor 9, and is divided into a first branch and a second branch, flowing to the switching valve 6 and the four-way valve 8 respectively. The refrigerant in the first branch is blocked by the capillary tube assembly in the switching valve 6 and cannot flow through. The refrigerant in the second branch enters the indoor heat exchanger 10, then passes through the electronic expansion valve 11, and then enters the outdoor heat exchanger 12. Since the control valve 5 is in the open state, the refrigerant can be divided into three paths and enter the first heat exchange module 1, the second heat exchange module 2, and the third heat exchange module 3 of the outdoor heat exchanger 12 respectively. Then, it converges again after passing through the switching valve 6 and the four-way valve 8 and enters the compressor 9 to complete the cycle. At this time, the heat exchanger acts as a condenser, and the refrigerant flow path is less and the process is longer, which conforms to the principle of efficient heat exchange of the condenser.

[0119] It should be noted that in the low-frequency heating mode, that is, the heating mode under high-temperature environment, the four-way valve 8 is energized, the switching valve 6 is de-energized, and the control valve 5 is closed.

[0120] It should be understood that referring to Figure 5 , Figure 5 is the schematic diagram of refrigerant flow for the second heating mode (i.e., low-frequency heating mode), where the solid arrows represent the refrigerant flow direction. The refrigerant is discharged from the exhaust port of the compressor 9, and is divided into a first branch and a second branch, flowing to the switching valve 6 and the four-way valve 8 respectively. The refrigerant in the first branch is blocked by the first one-way valve 4 at the switching valve 6 and cannot flow through. The refrigerant in the second branch enters the indoor heat exchanger 10, then passes through the electronic expansion valve 11, and then enters the outdoor heat exchanger 12. Since the control valve 5 is in the closed state, the refrigerant can only flow through the third heat exchange module 3 first, then enter the second heat exchange module 2, and then flow through the first heat exchange module 1 to complete the heat exchange. Then, it enters the compressor 9 through the four-way valve 8 to complete the cycle. At this time, the operating frequency of the compressor 9 is relatively low, and the heat exchanger acts as an evaporator. The refrigerant flow path is less and the process is longer, which meets the requirements of efficient heat exchange.

[0121] In this embodiment, by obtaining the current heat exchange state of the indoor heat exchanger and the operating frequency of the compressor, the target operating mode of the heat exchange system is identified, and the reversing valve group in the heat exchange system is controlled based on the target operating mode of the heat exchange system, so as to control the refrigerant flow path flowing through each heat exchange module, effectively control the refrigerant flow path flowing through each heat exchange module in the heat exchange system based on different working requirements, thereby improving the heat exchange efficiency and energy-saving efficiency, and realizing the control of the number and length of the refrigerant flow paths in different heat exchange application scenarios, effectively meeting the heat exchange requirements in different scenarios.

[0122] It should be understood that the above is only an example for illustration and does not constitute any limitation to the technical solution of the present invention. In specific applications, those skilled in the art can set according to needs, and the present invention does not limit this.

[0123] It should be noted that the above-described work process is only illustrative and does not limit the protection scope of the present invention. In actual applications, those skilled in the art can select some or all of them according to actual needs to achieve the purpose of the solution of this embodiment, and there is no limitation here.

[0124] In addition, for the technical details not described in detail in this embodiment, reference can be made to the control method of the heat exchange system provided in any embodiment of the present invention, which will not be elaborated here.

[0125] In addition, it should be noted that in this article, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or system. Without more limitations, the element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or system including the element.

[0126] It should also be noted that in this specification, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or device including the element.

[0127] The serial numbers of the embodiments of the present invention above are only for description and do not represent the superiority or inferiority of the embodiments.

[0128] Through the description of the above embodiments, those skilled in the art can clearly understand that the above embodiment methods can be implemented by means of software plus a necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product is stored in a storage medium (such as a read-only memory (ROM) / RAM, magnetic disk, optical disk), and includes several instructions to enable a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0129] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied to other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A control method for a heat exchange system, characterized in that, The method is applied to a heat exchange system, which includes a reversing valve group, a compressor, an indoor heat exchanger, and an outdoor heat exchanger. The outdoor heat exchanger includes a first heat exchange module, a second heat exchange module, and a third heat exchange module; The reversing valve group includes at least five ports. Four of the ports of the reversing valve group are respectively connected to the exhaust port of the compressor, the suction port of the compressor, one end of the first heat exchange module, and the indoor heat exchanger. The other port of the reversing valve group is connected to one end of the second heat exchange module and the third heat exchange module; The other end of the first heat exchange module, the other end of the second heat exchange module, and the other end of the third heat exchange module are all connected to the indoor heat exchanger; The control method of the heat exchange system includes: Obtaining the current heat exchange state of the indoor heat exchanger and the current operating frequency of the compressor; Determining the target working mode of the heat exchange system based on the current heat exchange state and the current operating frequency; and Controlling the reversing valve group based on the target working mode to control the refrigerant flow path flowing through each heat exchange module in the outdoor heat exchanger in the heat exchange system.

2. The control method of the heat exchange system according to claim 1, wherein The reversing valve group includes a four-way valve and a switching valve; The four ports of the four-way valve are respectively connected to the exhaust port of the compressor, the suction port of the compressor, one end of the first heat exchange module, and the indoor heat exchanger; The switching valve includes at least three ports. Two of the ports of the switching valve are respectively connected to the exhaust port of the compressor and the suction port of the compressor. The other port of the switching valve is connected to one end of the second heat exchange module and the third heat exchange module; The controlling the reversing valve group based on the target working mode to control the refrigerant flow path flowing through each heat exchange module in the outdoor heat exchanger in the heat exchange system further includes: Controlling the four-way valve and / or the switching valve based on the target working mode to control the refrigerant flow path flowing through each heat exchange module in the outdoor heat exchanger in the heat exchange system.

3. The control method of the heat exchange system according to claim 2, wherein The target working mode includes a rated cooling mode, a first heating mode, and a second heating mode.

4. The control method of the heat exchange system according to claim 3, characterized in that, The reversing system further includes a control valve, which is connected between the connection end of the first heat exchange module and the second heat exchange module and the connection end of the third heat exchange module and the indoor heat exchanger; When the target working mode is the rated cooling mode, the controlling the four-way valve and the switching valve respectively includes: Controlling the control valve to close, the switching valve to lose power, and the four-way valve to lose power to control the refrigerant flow path flowing through each heat exchange module in the outdoor heat exchanger in the heat exchange system.

5. The control method of the heat exchange system according to claim 3, wherein, When the target working mode is the first heating mode, the controlling the four-way valve and the switching valve respectively includes: Controlling the control valve to open, the switching valve to be powered on, and the four-way valve to be powered on to control the refrigerant flow path flowing through each heat exchange module in the outdoor heat exchanger in the heat exchange system.

6. The control method of the heat exchange system according to claim 3, characterized in that When the target working mode is the second heating mode, the controlling the four-way valve and the switching valve respectively includes: Control the closing of the control valve, the power failure of the switching valve, and the power-on of the four-way valve to control the refrigerant flow path flowing through each heat exchange module in the outdoor heat exchanger in the heat exchange system.

7. A heat exchange system, characterized in that, The heat exchange system includes a reversing valve group, a compressor, an indoor heat exchanger, and an outdoor heat exchanger. The outdoor heat exchanger includes a first heat exchange module, a second heat exchanger module, and a third heat exchange module; The reversing valve group includes at least five ports. Four of the ports of the reversing valve group are respectively connected to the exhaust port of the compressor, the suction port of the compressor, one end of the first heat exchange module, and the indoor heat exchanger. Another port of the reversing valve group is connected to one end of the second heat exchange module and the third heat exchange module; The other end of the first heat exchange module, the other end of the second heat exchanger module, and the other end of the third heat exchange module are all connected to the indoor heat exchanger.

8. The heat exchange system according to claim 7, wherein The reversing valve group includes a four-way valve and a switching valve; The four ports of the four-way valve are respectively connected to the exhaust port of the compressor, the suction port of the compressor, one end of the first heat exchange module, and the indoor heat exchanger; The switching valve includes at least three ports. Two of the ports of the switching valve are respectively connected to the exhaust port of the compressor and the suction port of the compressor. Another port of the switching valve is connected to one end of the second heat exchange module and the third heat exchange module.

9. The heat exchange system according to claim 7, wherein, The reversing system further includes a control valve, and the control valve is connected between the connection end of the first heat exchange module and the second heat exchange module and the connection end of the third heat exchange module and the indoor heat exchanger.

10. The heat exchange system according to claim 9, characterized in that, The heat exchange system further includes a first check valve. The first check valve is connected between the connection end of the first heat exchange module and the second heat exchange module and the control valve, or the first check valve is connected between the connection end of the third heat exchange module and the indoor heat exchanger and the control valve; The conducting direction of the first check valve is from the connection end of the third heat exchange module and the indoor heat exchanger to the connection end of the first heat exchange module and the second heat exchange module.

11. The heat exchange system according to claim 7 or 8, characterized in that, The connection port of the reversing valve group with the second heat exchange module and the third heat exchange module is defined as the first connection port. The port of the second heat exchange module and the third heat exchange module after connection and connected to the first connection port is defined as the second connection port. The heat exchange system further includes a second check valve. The second check valve is connected between the first connection port and the second connection port, and the conducting direction of the second check valve is from the second connection port to the first connection port.

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