Air conditioning system and control method thereof

Abstract

The application provides an air conditioning system and a control method thereof. The air conditioning system comprises a compressor, an outlet and an inlet, wherein the outlet is communicated with the inlet through a circulating pipeline; the circulating pipeline comprises a control valve and a branch pipeline, wherein a refrigerator heat exchanger, an indoor heat exchanger, a heat pump water heater heat exchanger and an outdoor heat exchanger are arranged on the branch pipeline; and the control valve controls the flow state of the branch pipeline. The application couples the air conditioner, the refrigerator and the heat pump water heater into a system through the pipeline, fully utilizes the waste heat generated by each component and improves the energy efficiency of the system. In different working conditions, the control logic is formulated to fully utilize the heat generated by each component as much as possible, fully improve the energy efficiency of the system and improve the energy efficiency by about 10%.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of air conditioning systems, and particularly relates to an air conditioning system and a control method thereof. BACKGROUND

[0002] With the improvement of people's living standards, air conditioners, refrigerators and water heaters have gradually become necessities of life. However, the air conditioners, refrigerators and air source heat pump water heaters used at home are usually air-cooled systems. In summer, the condensing heat is discharged to the outdoor when the air conditioner is cooling. The condensing heat is discharged to the indoor when the refrigerator is cooling, and the air conditioner discharges it from the indoor. The heat pump water heater needs to absorb heat from the outdoor to provide hot water. In the whole process, a large amount of heat is wasted. SUMMARY

[0003] Therefore, the application provides an air conditioning system and a control method thereof, which can solve the problem of a large amount of heat waste in the prior art.

[0004] In order to solve the above problems, the application provides an air conditioning system, which comprises:

[0005] A compressor comprising an outlet and an inlet, wherein the outlet is communicated with the inlet through a circulating pipeline;

[0006] The circulating pipeline comprises a control valve and a branch, wherein a refrigerator heat exchanger, an indoor heat exchanger, a water heater heat exchanger and an outdoor heat exchanger are arranged on the branch; and the control valve controls the flow state of the branch.

[0007] Optionally, the branch is provided with four branches, i.e., a first branch, a second branch, a third branch and a fourth branch, wherein the refrigerator heat exchanger is arranged on the first branch, the indoor heat exchanger is arranged on the second branch, the water heater heat exchanger is arranged on the third branch, and the outdoor heat exchanger is arranged on the fourth branch; one end of the first branch, the second branch, the third branch and the fourth branch is communicated as a common end; the control valve is provided with six control valves, i.e., a first control valve, a second control valve, a third control valve, a fourth control valve, a fifth control valve and a sixth control valve; the air conditioning assembly further comprises a four-way valve and a three-way valve, wherein the outlet is communicated with a D port of the four-way valve, an E port of the four-way valve is communicated with the other end of the second branch, and the other end of the second branch is communicated with the inlet, an S port of the four-way valve and an S port of the three-way valve through the first control valve; the E port of the four-way valve is communicated with the four-way valve C port through the sixth control valve, and the four-way valve C port is connected in parallel with the four-way valve C port through the third control valve, and then communicated with a D port of the three-way valve through the fourth control valve and the other end of the third branch through the fifth control valve; and the C port of the three-way valve is communicated with the other end of the fourth branch.

[0008] Optionally, a third throttling device is arranged on the first branch between the refrigerator heat exchanger and the common end; a second throttling device is arranged on the second branch between the indoor heat exchanger and the common end; and a first throttling device is arranged on the fourth branch between the outdoor heat exchanger and the common end.

[0009] According to another aspect of the present application, there is provided a control method of the air conditioning system as described above, comprising:

[0010] In a first mode, the total cooling load of the indoor heat exchanger and the refrigerator heat exchanger is greater than the heating load of the hot water machine heat exchanger, and the refrigerant cycle of the air conditioning system sequentially flows through the compressor, the hot water machine heat exchanger and the outdoor heat exchanger in parallel, the refrigerator heat exchanger and the indoor heat exchanger in parallel, and returns to the compressor.

[0011] According to another aspect of the present application, there is provided a control method of the air conditioning system as described above, comprising:

[0012] In a second mode, the total cooling load of the indoor heat exchanger and the refrigerator heat exchanger is equal to the heating load of the hot water machine heat exchanger, and the refrigerant cycle of the air conditioning system sequentially flows through the compressor, the hot water machine heat exchanger, the refrigerator heat exchanger and the indoor heat exchanger in parallel, and returns to the compressor.

[0013] According to another aspect of the present application, there is provided a control method of the air conditioning system as described above, comprising:

[0014] In a third mode, the total cooling load of the indoor heat exchanger and the refrigerator heat exchanger is less than the heating load of the hot water machine heat exchanger, and the refrigerant cycle of the air conditioning system sequentially flows through the compressor, the hot water machine heat exchanger, the refrigerator heat exchanger, the indoor heat exchanger and the outdoor heat exchanger in parallel, and returns to the compressor.

[0015] According to another aspect of the present application, there is provided a control method of the air conditioning system as described above, comprising:

[0016] In a fourth mode, the total heating load of the indoor heat exchanger and the hot water machine heat exchanger is greater than the cooling load of the refrigerator heat exchanger, and the refrigerant cycle of the air conditioning system sequentially flows through the compressor, the hot water machine heat exchanger and the indoor heat exchanger in parallel, the outdoor heat exchanger and the refrigerator heat exchanger, and returns to the compressor.

[0017] According to another aspect of the present application, there is provided a control method of the air conditioning system as described above, comprising:

[0018] Fifth mode, the total heat load of the indoor heat exchanger and the hot water machine heat exchanger is equal to the cold load of the refrigerator heat exchanger, the refrigerant cycle of the air conditioning system flows through the compressor, the hot water machine heat exchanger and the indoor heat exchanger in parallel, the refrigerator heat exchanger in turn, and returns to the compressor.

[0019] According to another aspect of the present application, a control method of the air conditioning system is provided, comprising: when the indoor heat exchanger is in a heating working condition,

[0020] Sixth mode, the total heat load of the indoor heat exchanger and the hot water machine heat exchanger is less than the cold load of the refrigerator heat exchanger, the refrigerant cycle of the air conditioning system flows through the compressor, the hot water machine heat exchanger and the indoor heat exchanger in parallel, the refrigerator heat exchanger and the outdoor heat exchanger in parallel, and returns to the compressor.

[0021] The air conditioning system provided by the present application comprises a compressor, an outlet and an inlet of the compressor, the outlet is communicated with the inlet through a circulating pipeline, the circulating pipeline comprises a control valve and a branch, a refrigerator heat exchanger, an indoor heat exchanger, a hot water machine heat exchanger and an outdoor heat exchanger are arranged on the branch, and the control valve controls the flow state of the branch.

[0022] The present application couples the air conditioner, the refrigerator and the hot water machine into a system through the pipeline, fully utilizes the waste heat generated by each component, and improves the energy efficiency of the system. In different working conditions, the control logic is formulated, the heat generated by each component is fully utilized as much as possible, the energy efficiency of the system is fully improved, and the system can be improved by about 10%. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 FIG. 1 is a structural schematic diagram of the air conditioning system of the embodiment of the present application;

[0024] Figure 2 FIG. 2 is a first mode running structure diagram of the air conditioning system of the embodiment of the present application;

[0025] Figure 3 FIG. 3 is a second mode running structure diagram of the air conditioning system of the embodiment of the present application;

[0026] Figure 4 FIG. 4 is a third mode running structure diagram of the air conditioning system of the embodiment of the present application;

[0027] Figure 5 FIG. 5 is a fourth mode running structure diagram of the air conditioning system of the embodiment of the present application;

[0028] Figure 6 FIG. 6 is a fifth mode running structure diagram of the air conditioning system of the embodiment of the present application;

[0029] Figure 7 Figure 6 is a schematic diagram of a sixth mode of operation of the air conditioning system of the present application.

[0030] Reference signs are indicated as:

[0031] 1, compressor; 2, water heater heat exchanger; 3, outdoor heat exchanger; 4, indoor heat exchanger; 5, refrigerator heat exchanger; 6, four-way valve; 7, three-way valve; 8, first electronic expansion valve; 9, second electronic expansion valve; 10, third electronic expansion valve; 11, first solenoid valve; 12, second solenoid valve; 13, third solenoid valve; 14, fourth solenoid valve; 15, fifth solenoid valve; 16, sixth solenoid valve; 17, first branch; 18, second branch; 19, third branch; 20, fourth branch. DETAILED DESCRIPTION

[0032] In order to make the objectives, technical solutions and advantages of the present application clearer, the following will be a clear and complete description of the technical solutions of the present application in combination with the embodiments of the present application and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0033] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or a chronological sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0034] Reference should be made to Figures 1 to 7 As shown, according to the embodiments of the present application, an air conditioning system comprises:

[0035] The compressor 1 comprises an outlet and an inlet, and the outlet is communicated with the inlet through a circulating pipeline;

[0036] The circulating pipeline comprises a control valve and a branch, and the branch is provided with a refrigerator heat exchanger 5, an indoor heat exchanger 4, a water heater heat exchanger 2 and an outdoor heat exchanger 3; the control valve regulates the flow condition of the branch.

[0037] The application couples air conditioner, refrigerator, heat pump water heater through pipeline into a system, fully utilizes waste heat generated by each component, and improves system energy efficiency. In different working conditions, control logic is formulated to fully utilize heat generated by each component as much as possible, fully improve system energy efficiency, and improve about 10%.

[0038] In some embodiments, the branch is provided with four branches: the first branch 17, the second branch 18, the third branch 19 and the fourth branch 20, the refrigerator heat exchanger 5 is arranged on the first branch 17, the indoor heat exchanger 4 is arranged on the second branch 18, the heat pump water heater heat exchanger 2 is arranged on the third branch 19, and the outdoor heat exchanger 3 is arranged on the fourth branch 20; one end of the first branch 17, the second branch 18, the third branch 19 and the fourth branch 20 is communicated as a common end; the control valve is provided with six control valves: the first control valve, the second control valve, the third control valve, the fourth control valve, the fifth control valve and the sixth control valve; the air conditioner assembly further comprises a four-way valve 6 and a three-way valve 7, the outlet is communicated with the four-way valve 6D port, the four-way valve 6E port is communicated with the other end of the second branch 18, and is communicated with the other end of the first branch 17 through the first control valve; the other end of the first branch 17 is communicated with the inlet, the four-way valve 6S port and the three-way valve 7S port through the second control valve; the four-way valve 6E port is communicated with the four-way valve 6C port through the sixth control valve, and the four-way valve 6C port is connected with the three-way valve 7D port through the fourth control valve and the fifth control valve after being connected with the third control valve in parallel; the three-way valve 7C port is communicated with the other end of the fourth branch 20.

[0039] The refrigerator heat exchanger 5, the indoor heat exchanger 4, the heat pump water heater heat exchanger 2 and the outdoor heat exchanger 3 are arranged on the four branches respectively, and the four-way valve 6 and the three-way valve 7 are combined, so that the whole circulating path can form multiple, thereby effectively integrating and using the heat of the air conditioner, the refrigerator and the heat pump water heater according to different working conditions, and improving the energy efficiency of the whole system.

[0040] In some embodiments, a third throttling member is arranged on the first branch 17 between the refrigerator heat exchanger 5 and the common end; a second throttling member is arranged on the second branch 18 between the indoor heat exchanger 4 and the common end; and a first throttling member is arranged on the fourth branch 20 between the outdoor heat exchanger 3 and the common end.

[0041] The throttling members are arranged on the branches where the refrigerator heat exchanger 5, the indoor heat exchanger 4 and the heat pump water heater heat exchanger 2 are arranged, the circulating refrigerant is throttled, the refrigerant flow of each component is reasonably distributed, and the heat of each component is effectively utilized.

[0042] According to another aspect of the present application, there is provided a control method of the air conditioning system as described above, comprising: when the indoor heat exchanger 4 is in a cooling condition,

[0043] The first mode, the total cooling load of the indoor heat exchanger 4 and the refrigerator heat exchanger 5 is greater than the heat load of the hot water machine heat exchanger 2, the refrigerant cycle of the air conditioning system sequentially flows through the compressor 1, the hot water machine heat exchanger 2 and the outdoor heat exchanger 3 in parallel, the refrigerator heat exchanger 5 and the indoor heat exchanger 4 in parallel, and returns to the compressor 1.

[0044] When the air conditioner is in a cooling state, the cooling load and the refrigerator load are greater than the load of the hot water machine, the heat generated by the system is greater than the heat absorbed, and the outdoor heat exchanger needs to be used to release heat, at this time the sixth electromagnetic valve 16 and the second electromagnetic valve 12 are closed, the first electromagnetic valve 11, the third electromagnetic valve 13, the fourth electromagnetic valve 14 and the fifth electromagnetic valve 15 are opened, the C and D ports of the four-way valve 6 are connected, the S and E ports are connected, the C and D ports of the three-way valve 7 are connected, a part of the high-temperature and high-pressure gas from the compressor 1 enters the hot water machine heat exchanger 2 to condense and release heat, and the other part enters the outdoor heat exchanger 3 to exchange heat and dissipate the excess heat generated by the air conditioner and the refrigerator, at this time the first electronic expansion valve 8 is fully opened, the refrigerant entering the outdoor heat exchanger passes through the first electronic expansion valve 8 and the refrigerant outlet of the heat pump hot water machine, and then passes through the second electronic expansion valve 9 and the third electronic expansion valve 10, respectively, to enter the air conditioner indoor heat exchanger 4 and the refrigerator heat exchanger 5, and then become low-pressure gas in the low-pressure pipe after evaporating and absorbing heat, and then enter the compressor to complete a cycle.

[0045] According to another aspect of the present application, there is provided a control method of the air conditioning system as described above, comprising: when the indoor heat exchanger 4 is in a cooling condition,

[0046] The second mode, the total cooling load of the indoor heat exchanger 4 and the refrigerator heat exchanger 5 is equal to the heat load of the hot water machine heat exchanger 2, the refrigerant cycle of the air conditioning system sequentially flows through the compressor 1, the hot water machine heat exchanger 2, the refrigerator heat exchanger 5 and the indoor heat exchanger 4 in parallel, and returns to the compressor 1.

[0047] When the air conditioner is in a cooling state, its cold load and refrigerator load are equal to the load of the water heater, the heat generated by the system is equal to the heat absorbed, and no heat exchange is needed by using the outdoor heat exchanger. At this time, the sixth solenoid valve 16, the second solenoid valve 12 and the fourth solenoid valve 14 are closed, the first solenoid valve 11, the third solenoid valve 13 and the fifth solenoid valve 15 are opened, the C and D ports of the four-way valve 6 are connected, the S and E ports are connected, the high-temperature and high-pressure gas from the compressor enters the high-pressure gas pipe and then enters the heat pump water heater to condense and release heat, the refrigerant at the outlet of the heat pump water heater passes through the second electronic expansion valve 9 and the third electronic expansion valve 10, and then enters the air conditioner indoor heat exchanger 4 and the refrigerator heat exchanger 5, and then enters the evaporators of the air conditioner and the refrigerator to evaporate and absorb heat, and then enters the low-pressure gas pipe and then enters the compressor to complete a cycle.

[0048] According to another aspect of the present application, a control method of the air conditioning system is provided, and the method comprises the following steps:

[0049] In the third mode, the total cold load of the indoor heat exchanger 4 and the refrigerator heat exchanger 5 is less than the heat load of the water heater heat exchanger 2, the refrigerant of the air conditioning system circulates through the compressor 1, the water heater heat exchanger 2, the parallel-connected refrigerator heat exchanger 5, the indoor heat exchanger 4 and the outdoor heat exchanger 3 in sequence, and returns to the compressor 1.

[0050] When the air conditioner is in a cooling state, its cold load and refrigerator load are equal to the load of the water heater, the heat generated by the system is equal to the heat absorbed, and no heat exchange is needed by using the outdoor heat exchanger. At this time, the sixth solenoid valve 16, the second solenoid valve 12 and the fourth solenoid valve 14 are closed, the first solenoid valve 11, the third solenoid valve 13 and the fifth solenoid valve 15 are opened, the C and D ports of the four-way valve 6 are connected, the S and E ports are connected, the high-temperature and high-pressure gas from the compressor enters the high-pressure gas pipe and then enters the heat pump water heater to condense and release heat, the refrigerant at the outlet of the heat pump water heater passes through the second electronic expansion valve 9 and the third electronic expansion valve 10, and then enters the air conditioner indoor heat exchanger 4 and the refrigerator heat exchanger 5, and then enters the evaporators of the air conditioner and the refrigerator to evaporate and absorb heat, and then enters the low-pressure gas pipe and then enters the compressor to complete a cycle.

[0051] According to another aspect of the present application, a control method of the air conditioning system is provided, and the method comprises the following steps:

[0052] Fourth mode, the total heat load of the indoor heat exchanger 4 and the hot water machine heat exchanger 2 is greater than the cold load of the refrigerator heat exchanger 5, the refrigerant circulation of the air conditioning system sequentially flows through the compressor 1, the parallel hot water machine heat exchanger 2, the indoor heat exchanger 4 and the outdoor heat exchanger 3, the refrigerator heat exchanger 5, and returns to the compressor 1.

[0053] When the air conditioner is in the heating state, the air conditioner heat load and the water heater heat load are greater than the refrigerator cold load, the heat generated by the system is greater than the heat absorbed, and the heat needs to be dissipated by the outdoor heat exchanger, at this time, the first electromagnetic valve 11 and the third electromagnetic valve 13 are closed, the second electromagnetic valve 12, the fourth electromagnetic valve 14, the fifth electromagnetic valve 15 and the sixth electromagnetic valve 16 are opened, the E and D ports of the four-way valve 6 are connected, the S and C ports are connected, the C and D ports of the three-way valve 7 are connected, the high-temperature and high-pressure gas from the compressor 1 enters the hot water machine heat exchanger 2, the outdoor heat exchanger 3 and the air conditioner indoor heat exchanger 4 to condense and dissipate heat, at this time, the first electronic expansion valve 8 and the second electronic expansion valve 9 are fully opened, the refrigerant at the outlets of the hot water machine heat exchanger 2, the outdoor heat exchanger 3 and the air conditioner indoor heat exchanger 4 is combined, then passes through the third electronic expansion valve 10 to reduce the pressure and enters the refrigerator heat exchanger 5, and then becomes low-pressure gas after evaporating and absorbing heat in the refrigerator heat exchanger 5, and then enters the low-pressure gas pipe and then enters the compressor to complete a cycle.

[0054] According to another aspect of the present application, a control method of the air conditioning system is provided, and the indoor heat exchanger 4 is in the heating working condition,

[0055] Fifth mode, the total heat load of the indoor heat exchanger 4 and the hot water machine heat exchanger 2 is equal to the cold load of the refrigerator heat exchanger 5, the refrigerant circulation of the air conditioning system sequentially flows through the compressor 1, the parallel hot water machine heat exchanger 2 and the indoor heat exchanger 4, the refrigerator heat exchanger 5, and returns to the compressor 1.

[0056] When the air conditioner is in the heating state, the air conditioner heat load and the water heater heat load are equal to the refrigerator cold load, the heat generated by the system is equal to the heat absorbed, and the heat does not need to be dissipated by the outdoor heat exchanger, at this time, the first electromagnetic valve 11, the third electromagnetic valve 13 and the fourth electromagnetic valve 14 are closed, the second electromagnetic valve 12, the fifth electromagnetic valve 15 and the sixth electromagnetic valve 16 are opened, the E and D ports of the four-way valve 6 are connected, the S and C ports are connected, the C and D ports of the three-way valve 7 are connected, the high-temperature and high-pressure gas from the compressor 1 enters the hot water machine heat exchanger 2 and the air conditioner indoor heat exchanger 4 to condense and dissipate heat, at this time, the second electronic expansion valve 9 is fully opened, the refrigerant at the outlets of the hot water machine heat exchanger 2 and the air conditioner indoor heat exchanger 4 is combined, then passes through the third electronic expansion valve 10 to reduce the pressure and enters the refrigerator heat exchanger 5, and then becomes low-pressure gas after evaporating and absorbing heat in the refrigerator heat exchanger 5, and then enters the low-pressure gas pipe and then enters the compressor to complete a cycle.

[0057] According to another aspect of the present application, a control method of the air conditioning system is provided, comprising: when the indoor heat exchanger 4 is in a heating mode,

[0058] In the sixth mode, the total heat load of the indoor heat exchanger 4 and the hot water machine heat exchanger 2 is less than the cold load of the refrigerator heat exchanger 5, and the refrigerant cycle of the air conditioning system sequentially flows through the compressor 1, the hot water machine heat exchanger 2 and the indoor heat exchanger 4 in parallel, the refrigerator heat exchanger 5 and the outdoor heat exchanger 3 in parallel, and returns to the compressor 1.

[0059] When the air conditioner is in a heating state, the air conditioning heat load and the hot water machine heat load are less than the cold load of the refrigerator, the heat generated by the system is less than the heat absorbed, and the outdoor heat exchanger needs to absorb heat, at this time, the first solenoid valve 11, the third solenoid valve 13 and the fourth solenoid valve 14 are closed, the second solenoid valve 12, the fifth solenoid valve 15 and the sixth solenoid valve 16 are opened, the E and D ports of the four-way valve 6 are connected, the S and C ports are connected, the S and C ports of the three-way valve 7 are connected, the high-temperature and high-pressure gas from the compressor 1 enters the hot water machine heat exchanger 2 and the air conditioner indoor heat exchanger 4 to condense and release heat, at this time, the second electronic expansion valve 9 is fully opened, the refrigerant at the outlets of the hot water machine heat exchanger 2 and the air conditioner indoor heat exchanger 4 is mixed and then passes through the first electronic expansion valve 8 and the third electronic expansion valve 10, respectively, by adjusting the opening degrees of the first electronic expansion valve 8 and the third electronic expansion valve 10, the refrigerant flow is reasonably distributed, and then enters the outdoor heat exchanger 3 and the refrigerator heat exchanger 5 to evaporate and absorb heat, and then returns to the compressor to complete a cycle.

[0060] It is easy for those skilled in the art to understand that the above-mentioned embodiments can be freely combined and superimposed without conflict.

[0061] The above only describes the preferred embodiments of the present application and should not be used to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application. The above only describes the preferred embodiments of the present application, and it should be pointed out that, for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and variations can be made, which should be regarded as the protection scope of the present application.

Claims

1. An air conditioning system, characterized in that, include: The compressor (1) includes an outlet and an inlet, the outlet being connected to the inlet via a circulation pipeline; The circulation pipeline includes a control valve and a branch line. The branch line is equipped with a refrigerator heat exchanger (5), an indoor heat exchanger (4), a water heater heat exchanger (2), and an outdoor heat exchanger (3). The control valve regulates the flow of the branch line. The branch circuit has four branches: the first branch (17), the second branch (18), the third branch (19), and the fourth branch (20). The refrigerator heat exchanger (5) is located on the first branch (17), the indoor heat exchanger (4) is located on the second branch (18), the water heater heat exchanger (2) is located on the third branch (19), and the outdoor heat exchanger (3) is located on the fourth branch (20). One end of the first branch (17), the second branch (18), the third branch (19), and the fourth branch (20) is connected to form a common end. The control valve has six components: the first control valve, the second control valve, the third control valve, the fourth control valve, the fifth control valve, and the sixth control valve. The air conditioning assembly also includes a four-way valve (6) and a three-way valve. The outlet of the four-way valve (6) is connected to the D port of the four-way valve (6), the E port of the four-way valve (6) is connected to the other end of the second branch (18), and is connected to the other end of the first branch (17) via the first control valve; the other end of the first branch (17) is connected to the inlet, the S port of the four-way valve (6) and the S port of the three-way valve (7) via the second control valve; the E port of the four-way valve (6) is connected to the C port of the four-way valve (6) via the sixth control valve, and after being connected in parallel with the C port of the four-way valve (6) via the third control valve, it is connected to the D port of the three-way valve (7) via the fourth control valve and to the other end of the third branch (19) via the fifth control valve; the C port of the three-way valve (7) is connected to the other end of the fourth branch (20).

2. The air conditioning system according to claim 1, characterized in that, A third throttling device is provided on the first branch (17) between the refrigerator heat exchanger (5) and the common end; a second throttling device is provided on the second branch (18) between the indoor heat exchanger (4) and the common end; and a first throttling device is provided on the fourth branch (20) between the outdoor heat exchanger (3) and the common end.

3. A control method for an air conditioning system as described in claim 1 or 2, characterized in that, include: When the indoor heat exchanger (4) is in cooling mode, In the first mode, the total cooling load of the indoor heat exchanger (4) and the refrigerator heat exchanger (5) is greater than the heat load of the water heater heat exchanger (2). The refrigerant of the air conditioning system flows sequentially through the compressor (1), the parallel water heater heat exchanger (2) and the outdoor heat exchanger (3), the parallel refrigerator heat exchanger (5) and the indoor heat exchanger (4), and returns to the compressor (1).

4. A control method for an air conditioning system as described in claim 1 or 2, characterized in that, include: When the indoor heat exchanger (4) is in cooling mode, In the second mode, the total cooling load of the indoor heat exchanger (4) and the refrigerator heat exchanger (5) is equal to the heat load of the water heater heat exchanger (2). The refrigerant of the air conditioning system flows sequentially through the compressor (1), the water heater heat exchanger (2), the parallel refrigerator heat exchanger (5) and the indoor heat exchanger (4), and returns to the compressor (1).

5. A control method for an air conditioning system as described in claim 1 or 2, characterized in that, include: When the indoor heat exchanger (4) is in cooling mode, In the third mode, the total cooling load of the indoor heat exchanger (4) and the refrigerator heat exchanger (5) is less than the heat load of the water heater heat exchanger (2). The refrigerant of the air conditioning system flows sequentially through the compressor (1), the water heater heat exchanger (2), the parallel refrigerator heat exchanger (5), the indoor heat exchanger (4), and the outdoor heat exchanger (3), and returns to the compressor (1).

6. A control method for an air conditioning system as described in claim 1 or 2, characterized in that, include: When the indoor heat exchanger (4) is in heating mode, In the fourth mode, the total heat load of the indoor heat exchanger (4) and the water heater heat exchanger (2) is greater than the cold load of the refrigerator heat exchanger (5). The refrigerant of the air conditioning system flows sequentially through the compressor (1), the parallel water heater heat exchanger (2), the indoor heat exchanger (4), the outdoor heat exchanger (3), and the refrigerator heat exchanger (5), and returns to the compressor (1).

7. A control method for an air conditioning system as described in claim 1 or 2, characterized in that, include: When the indoor heat exchanger (4) is in heating mode, In the fifth mode, the total heat load of the indoor heat exchanger (4) and the water heater heat exchanger (2) is equal to the cold load of the refrigerator heat exchanger (5). The refrigerant of the air conditioning system flows sequentially through the compressor (1), the parallel water heater heat exchanger (2) and the indoor heat exchanger (4), the refrigerator heat exchanger (5), and returns to the compressor (1).

8. A control method for an air conditioning system as described in claim 1 or 2, characterized in that, include: When the indoor heat exchanger (4) is in heating mode, In the sixth mode, the total heat load of the indoor heat exchanger (4) and the water heater heat exchanger (2) is less than the cold load of the refrigerator heat exchanger (5). The refrigerant of the air conditioning system flows sequentially through the compressor (1), the parallel water heater heat exchanger (2) and the indoor heat exchanger (4), the parallel refrigerator heat exchanger (5) and the outdoor heat exchanger (3), and returns to the compressor (1).

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