Air conditioning system and control method

Abstract

The invention provides an air conditioning system and a control method. The air conditioning system comprises a first heat exchange pipeline and an indoor heat exchanger. A second heat exchange pipeline and an outdoor heat exchanger; a third heat exchange pipeline and a water tank; an exhaust port of the compressor selectively communicates with at least one of an inflow port of the second heat exchange pipeline and an inflow port of the third heat exchange pipeline, and an air suction port of the compressor selectively communicates with one of an outflow port of the first heat exchange pipeline and an outflow port of the second heat exchange pipeline; and at least one outflow port, used for communicating with an exhaust port of the compressor, in the first heat exchange pipeline, the second heat exchange pipeline and the third heat exchange pipeline communicates with one inflow port, used for communicating with an air suction port of the compressor, in the first heat exchange pipeline, the second heat exchange pipeline and the third heat exchange pipeline to form a heat exchange circulation flow path. Through the technical scheme provided by the invention, the technical problem of energy waste caused by long-time operation of an air conditioning system in the prior art can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioning systems, in particular to an air conditioning system and a control method. BACKGROUND

[0002] At present, people have higher and higher requirements for the comfort of indoor environment, especially in special weather such as plum rain and back to the south, users need to use the dehumidification mode of the air conditioner for a long time to create a comfortable indoor environment.

[0003] However, long-time operation of the air conditioner will consume a large amount of electric energy, resulting in an increase in electricity charges, which is a considerable expense for many families. Especially in summer and transition seasons, the air conditioning system will generate a large amount of waste heat in the process of refrigeration and dehumidification. The condensation heat generated by the refrigeration working condition of the current air conditioning system is as high as about 1.3 times of the refrigeration capacity, which is directly discharged into the atmosphere without effective utilization, not only being a huge waste of energy, but also causing heat pollution to the environment and aggravating the urban "heat island effect". SUMMARY

[0004] The main purpose of the present application is to provide an air conditioning system and a control method to solve the technical problem that the air conditioning system in the prior art will cause energy waste in the case of long-time operation.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present application, an air conditioning system is provided, comprising:

[0006] a first heat exchange pipeline and an indoor heat exchanger arranged on the first heat exchange pipeline and in communication with the first heat exchange pipeline;

[0007] a second heat exchange pipeline and an outdoor heat exchanger arranged on the second heat exchange pipeline and in communication with the second heat exchange pipeline;

[0008] a third heat exchange pipeline and a water tank for heat exchange with the third heat exchange pipeline;

[0009] a compressor, the compressor having a suction port and a discharge port, the discharge port of the compressor being selectively in communication with at least one of the flow inlet of the second heat exchange pipeline and the flow inlet of the third heat exchange pipeline, the suction port of the compressor being selectively in communication with one of the flow outlet of the first heat exchange pipeline and the flow outlet of the second heat exchange pipeline, the flow outlet of at least one of the first heat exchange pipeline, the second heat exchange pipeline and the third heat exchange pipeline for communication with the discharge port of the compressor being in communication with the flow inlet of one of the first heat exchange pipeline, the second heat exchange pipeline and the third heat exchange pipeline for communication with the suction port of the compressor to form a heat exchange circulation flow path.

[0010] Further, the air conditioning system has a normal refrigeration mode, a total heat recovery mode, a partial heat recovery mode and a single hot water heating mode.

[0011] When the air conditioning system is in the normal refrigeration mode, the exhaust port of the compressor is in communication with the flow inlet of the second heat exchange pipeline, the suction port of the compressor is in communication with the flow outlet of the first heat exchange pipeline, and the flow inlet of the first heat exchange pipeline and the flow outlet of the second heat exchange pipeline are in communication to form a heat exchange circulation flow path.

[0012] When the air conditioning system is in the total heat recovery mode, the exhaust port of the compressor is in communication with the flow inlet of the third heat exchange pipeline, the suction port of the compressor is in communication with the flow outlet of the first heat exchange pipeline, and the flow inlet of the first heat exchange pipeline and the flow outlet of the third heat exchange pipeline are in communication to form a heat exchange circulation flow path.

[0013] When the air conditioning system is in the partial heat recovery mode, the exhaust port of the compressor is in communication with the flow inlets of the second heat exchange pipeline and the third heat exchange pipeline, the suction port of the compressor is in communication with the flow outlet of the first heat exchange pipeline, and the flow inlets of the first heat exchange pipeline, the flow outlet of the second heat exchange pipeline and the flow outlet of the third heat exchange pipeline are in communication to form a heat exchange circulation flow path.

[0014] When the air conditioning system is in the single hot water heating mode, the exhaust port of the compressor is in communication with the flow inlet of the third heat exchange pipeline, the suction port of the compressor is in communication with the flow outlet of the second heat exchange pipeline, and the flow inlet of the second heat exchange pipeline and the flow outlet of the third heat exchange pipeline are in communication to form a heat exchange circulation flow path.

[0015] Further, the second heat exchange pipeline has a first connecting port and a second connecting port respectively located at two ends of the second heat exchange pipeline, one of the first connecting port and the second connecting port is the flow inlet of the second heat exchange pipeline, and the other is the flow outlet of the second heat exchange pipeline; when the air conditioning system is in the normal refrigeration mode, the total heat recovery mode and the partial heat recovery mode, the fluid in the second heat exchange pipeline flows from the first connecting port to the second connecting port; when the air conditioning system is in the single hot water heating mode, the fluid in the second heat exchange pipeline flows from the second connecting port to the first connecting port.

[0016] Further, the second heat exchange pipeline has a first connecting port and a second connecting port respectively located at two ends of the second heat exchange pipeline, one of the first connecting port and the second connecting port is the flow inlet of the second heat exchange pipeline, and the other is the flow outlet of the second heat exchange pipeline; the air conditioning system comprises:

[0017] A four-way valve has a first communication port, a second communication port, a third communication port and a fourth communication port, the first communication port is selectively communicated or disconnected with a discharge port of the compressor, the second communication port is communicated with a first connecting port of the second heat exchange pipeline, the first communication port is communicated with the second communication port, the third communication port is communicated with a suction port of the compressor, the fourth communication port is communicated with a flow-out port of the first heat exchange pipeline, and the third communication port is communicated with the fourth communication port.

[0018] Further, the air conditioning system further comprises:

[0019] A first switch valve is arranged on a communication pipeline connecting the first communication port and the discharge port of the compressor, and the first switch valve is arranged in a selectively communicated or disconnected manner; and / or,

[0020] A second switch valve is arranged on the third heat exchange pipeline, and the second switch valve is arranged in a selectively communicated or disconnected manner; and / or,

[0021] A third switch valve is arranged on the second heat exchange pipeline, and the third switch valve is arranged in a selectively communicated or disconnected manner.

[0022] Further, the air conditioning system further comprises:

[0023] A first electronic expansion valve is arranged on the first heat exchange pipeline; and / or,

[0024] A second electronic expansion valve is arranged on the third heat exchange pipeline; and / or,

[0025] A one-way valve is arranged on the third heat exchange pipeline to make the fluid in the third heat exchange pipeline flow from one end of the third heat exchange pipeline to the other end of the third heat exchange pipeline.

[0026] According to another aspect of the present application, a control method is provided, which is suitable for the above-mentioned air conditioning system, and the control method comprises:

[0027] Obtaining a current temperature Tw of a water tank of the air conditioning system;

[0028] controlling whether to heat the water tank according to the current temperature Tw, to control the connection relationship of the air conditioning system, to make the exhaust port of the compressor of the air conditioning system communicate with at least one of the flow inlet of the second heat exchange pipeline of the air conditioning system and the flow inlet of the third heat exchange pipeline of the air conditioning system, to make the suction port of the compressor communicate with one of the flow outlet of the first heat exchange pipeline of the air conditioning system and the flow outlet of the second heat exchange pipeline of the air conditioning system, and to make the flow outlet of at least one of the first heat exchange pipeline, the second heat exchange pipeline and the third heat exchange pipeline used for communicating with the exhaust port of the compressor communicate with the flow inlet of one of the first heat exchange pipeline, the second heat exchange pipeline and the third heat exchange pipeline used for communicating with the suction port of the compressor to form a heat exchange circulation flow path.

[0029] Further, the controlling whether to heat the water tank according to the current temperature Tw, to control the connection relationship of the air conditioning system, comprises:

[0030] comparing the current temperature Tw of the water tank with a set maximum temperature h4;

[0031] when Tw≥h4, the exhaust port of the compressor communicates with the flow inlet of the second heat exchange pipeline, the suction port of the compressor communicates with the flow outlet of the first heat exchange pipeline, and the flow inlet of the first heat exchange pipeline and the flow outlet of the second heat exchange pipeline communicate to form a heat exchange circulation flow path, so that the air conditioning system is in a normal refrigeration mode;

[0032] when Tw

[0033] Further, the when Tw

[0034] comparing the current temperature of the water tank with an optimal heating temperature interval;

[0035] when the current temperature of the water tank is within the optimal heating temperature interval, the exhaust port of the compressor communicates with the flow inlet of the third heat exchange pipeline, the suction port of the compressor communicates with the flow outlet of the first heat exchange pipeline, and the flow inlet of the first heat exchange pipeline and the flow outlet of the third heat exchange pipeline communicate to form a heat exchange circulation flow path, so that the air conditioning system is in a total heat recovery mode;

[0036] When the current temperature of the water tank is not in the optimal heat temperature interval, the exhaust port of the compressor is communicated with the flow inlet of the second heat exchange pipeline and the flow inlet of the third heat exchange pipeline, the suction port of the compressor is communicated with the flow outlet of the first heat exchange pipeline, and the flow inlet of the first heat exchange pipeline, the flow outlet of the second heat exchange pipeline and the flow outlet of the third heat exchange pipeline are communicated to form a heat exchange circulation flow path, so that the air conditioning system is in a partial heat recovery mode.

[0037] Further, the control method further comprises:

[0038] When the current temperature of the water tank is in the optimal heat temperature interval, the air conditioning system is controlled to operate in the full heat recovery mode for a first preset time; and when the operation reaches the first preset time, a regulation process of regulating the communication relationship of the air conditioning system is entered according to the indoor environment temperature where the air conditioning system is located and / or the current temperature of the water tank.

[0039] When the current temperature of the water tank is not in the optimal heat temperature interval, the air conditioning system is controlled to operate in the partial heat recovery mode for a second preset time; and when the operation reaches the second preset time, the regulation process of regulating the communication relationship of the air conditioning system is entered according to the indoor environment temperature where the air conditioning system is located and / or the current temperature of the water tank.

[0040] Further, the regulation process comprises:

[0041] The indoor environment temperature where the air conditioning system is located is obtained, and it is judged whether the indoor environment temperature is in a set temperature range;

[0042] When the indoor environment temperature is out of the set temperature range, the air conditioning system is controlled to be in the partial heat recovery mode;

[0043] When the indoor environment temperature is in the set temperature range, the communication relationship of the air conditioning system is regulated according to the current temperature of the water tank.

[0044] Further, when the indoor environment temperature is in the set temperature range, the communication relationship of the air conditioning system is regulated according to the current temperature of the water tank, comprising:

[0045] The current temperature Tw of the water tank is compared with a heat recovery mode reserve highest water temperature h3, h3

[0046] When Tw

[0047] When Tw is greater than or equal to h3, the communication relationship of the air conditioning system is adjusted according to the size of Tw and / or the time difference T0 between the current time and the time when hot water is used by the user group.

[0048] Further, the adjustment of the communication relationship of the air conditioning system according to the size of Tw and / or the time difference T0 between the current time and the time when hot water is used by the user group comprises:

[0049] comparing T0 with a preset time difference M;

[0050] When T0 is greater than M, the air conditioning system is controlled to be in the normal refrigeration mode;

[0051] When T0 is less than or equal to M, the exhaust port of the compressor is communicated with the flow inlet of the third heat exchange pipeline, the suction port of the compressor is communicated with the flow outlet of the second heat exchange pipeline, the flow inlet of the second heat exchange pipeline and the flow outlet of the third heat exchange pipeline are communicated to form a heat exchange circulation flow path, so that the air conditioning system is in a single hot water heating mode; and after the water is heated to a set water temperature T1 in the single hot water heating mode, the air conditioning system is switched to the normal refrigeration mode.

[0052] Further, when the indoor environment temperature is within the set temperature range, the control method further comprises:

[0053] controlling the indoor fan of the air conditioning system to run at a low speed; and / or,

[0054] After the compressor is controlled to run at a low frequency for a third preset time, the air conditioning system is controlled to be in a dehumidification mode and run in a cycle with a preset time length as a period.

[0055] By applying the technical solution of the present application, even if a large amount of waste heat is generated in the air conditioning system during a long-time refrigeration and dehumidification process, the waste heat can also be effectively absorbed by the water in the water tank to heat the water in the water tank. By using the waste heat generated by the air conditioning system to heat the water in the water tank, the energy utilization efficiency can be greatly improved, and energy waste can be reduced. In addition, the multiple operation modes of the air conditioning system can be switched, and the dehumidification and cooling of the indoor environment can also be realized, thereby improving the comfort of the living environment. In addition, the indoor temperature and humidity are intelligently controlled, the generated condensation heat is recycled and reserved as hot water in advance, the effective utilization of the heat energy of the whole house is realized, the energy utilization rate is improved, and the influence of the air conditioning system on the surrounding environment is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0056] The drawings accompanying the specification of this application form a part thereof, serve to provide further understanding of the present application, and together with the specification explain the application in which the illustrative embodiments of the present application are described. The drawings in the accompanying specification of this application should not be considered limiting of the present application. In the drawings:

[0057] Figure 1 Fig. 1 shows a flow direction diagram of an air conditioning system according to an embodiment of the present application in a regular cooling mode;

[0058] Figure 2 Fig. 2 shows a flow direction diagram of an air conditioning system according to an embodiment of the present application in a total heat recovery mode;

[0059] Figure 3 Fig. 3 shows a flow direction diagram of an air conditioning system according to an embodiment of the present application in a partial heat recovery mode;

[0060] Figure 4 Fig. 4 shows a flow direction diagram of an air conditioning system according to an embodiment of the present application in a single heating mode;

[0061] Figure 5 Fig. 5 shows a flow chart of a control method according to an embodiment of the present application.

[0062] In the above drawings, the following reference signs are used:

[0063] 10, first heat exchange pipeline;

[0064] 20, indoor heat exchanger;

[0065] 30, second heat exchange pipeline;

[0066] 40, outdoor heat exchanger;

[0067] 51, third heat exchange pipeline; 52, water tank;

[0068] 60, compressor; 61, suction port; 62, discharge port;

[0069] 70, four-way valve; 71, first communication port; 72, second communication port; 73, third communication port; 74, fourth communication port;

[0070] 81, first on-off valve; 82, second on-off valve; 83, third on-off valve;

[0071] 91, first electronic expansion valve; 92, second electronic expansion valve;

[0072] 100, one-way valve. DETAILED DESCRIPTION

[0073] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0074] As Figures 1 to 4As shown, the embodiment of the present application provides an air conditioning system, which comprises: a first heat exchange pipeline 10, an indoor heat exchanger 20 arranged on the first heat exchange pipeline 10 and in communication with the first heat exchange pipeline 10, a second heat exchange pipeline 30, an outdoor heat exchanger 40 arranged on the second heat exchange pipeline 30 and in communication with the second heat exchange pipeline 30, a third heat exchange pipeline 51, a water tank 52 for heat exchange with the third heat exchange pipeline 51, and a compressor 60. The compressor 60 has a suction port 61 and a discharge port 62. The discharge port 62 of the compressor 60 is selectively in communication with at least one of a flow inlet of the second heat exchange pipeline 30 and a flow inlet of the third heat exchange pipeline 51. The suction port 61 of the compressor 60 is selectively in communication with one of a flow outlet of the first heat exchange pipeline 10 and a flow outlet of the second heat exchange pipeline 30. The flow outlet of at least one of the first heat exchange pipeline 10, the second heat exchange pipeline 30 and the third heat exchange pipeline 51 in communication with the discharge port 62 of the compressor 60 is in communication with the flow inlet of one of the first heat exchange pipeline 10, the second heat exchange pipeline 30 and the third heat exchange pipeline 51 in communication with the suction port 61 of the compressor 60 to form a heat exchange circulation flow path.

[0075] The air conditioning system provided by the embodiment can effectively absorb the waste heat generated by the air conditioning system in a long time refrigeration and dehumidification process by the water in the water tank 52 to heat the water in the water tank 52. The waste heat generated by the air conditioning system is used to heat the water in the water tank 52, which greatly improves the energy utilization efficiency and reduces energy waste. In addition, the condensation waste heat is used to obtain domestic hot water when the air conditioner is used for refrigeration, which almost realizes zero power consumption for heating domestic hot water in the heat recovery mode operation and reduces the heat pollution caused by the condensation heat to the environment. Not only the energy utilization rate is improved, but also the basic equipment utilization rate is greatly increased, which is conducive to the popularization and application of the household air conditioning heat pump water heating device.

[0076] It should be noted that the first heat exchange pipeline 10 comprises two pipe sections in communication with the heat exchange inlet and the heat exchange outlet of the indoor heat exchanger 20, and the second heat exchange pipeline 30 comprises two pipe sections in communication with the heat exchange inlet and the heat exchange outlet of the outdoor heat exchanger 40. The flow inlet and the flow outlet of the third heat exchange pipeline 51 both extend out of the water tank 52.

[0077] In the embodiment, the air conditioning system has a normal refrigeration mode, a total heat recovery mode, a partial heat recovery mode and a single hot water mode; when the air conditioning system is in the normal refrigeration mode, the discharge port 62 of the compressor 60 is communicated with the flow inlet of the second heat exchange pipeline 30, the suction port 61 of the compressor 60 is communicated with the flow outlet of the first heat exchange pipeline 10, and the flow inlet of the first heat exchange pipeline 10 and the flow outlet of the second heat exchange pipeline 30 are communicated to form a heat exchange circulation flow path. When the air conditioning system is in the total heat recovery mode, the discharge port 62 of the compressor 60 is communicated with the flow inlet of the third heat exchange pipeline 51, the suction port 61 of the compressor 60 is communicated with the flow outlet of the first heat exchange pipeline 10, and the flow inlet of the first heat exchange pipeline 10 and the flow outlet of the third heat exchange pipeline 51 are communicated to form a heat exchange circulation flow path. When the air conditioning system is in the partial heat recovery mode, the discharge port 62 of the compressor 60 is communicated with the flow inlets of the second heat exchange pipeline 30 and the third heat exchange pipeline 51, the suction port 61 of the compressor 60 is communicated with the flow outlet of the first heat exchange pipeline 10, and the flow inlet of the first heat exchange pipeline 10, the flow outlet of the second heat exchange pipeline 30 and the flow outlet of the third heat exchange pipeline 51 are communicated to form a heat exchange circulation flow path. When the air conditioning system is in the single hot water mode, the discharge port 62 of the compressor 60 is communicated with the flow inlet of the third heat exchange pipeline 51, the suction port 61 of the compressor 60 is communicated with the flow outlet of the second heat exchange pipeline 30, and the flow inlet of the second heat exchange pipeline 30 and the flow outlet of the third heat exchange pipeline 51 are communicated to form a heat exchange circulation flow path. With such a setting mode, it is convenient to flexibly switch to the normal refrigeration mode, the total heat recovery mode, the partial heat recovery mode and the single hot water mode according to actual use requirements, and mainly refrigerate in the normal refrigeration mode, heat the water in the water tank 52 through the total heat recovery mode or the single hot water mode when the water temperature is low, and heat the water in the water tank 52 through the partial heat recovery mode when the water temperature is high; and when it is necessary to quickly heat the water in the water tank 52, the single hot water mode is used for heating.

[0078] In the embodiment, the second heat exchange pipeline 30 has a first connecting port and a second connecting port located at two ends of the second heat exchange pipeline 30 respectively, one of the first connecting port and the second connecting port is the flow inlet of the second heat exchange pipeline 30, and the other is the flow outlet of the second heat exchange pipeline 30; when the air conditioning system is in the normal refrigeration mode, the total heat recovery mode and the partial heat recovery mode, the fluid in the second heat exchange pipeline 30 flows from the first connecting port to the second connecting port; when the air conditioning system is in the single hot water mode, the fluid in the second heat exchange pipeline 30 flows from the second connecting port to the first connecting port. With such a setting, the flow direction of the second heat exchange pipeline 30 can be adapted to different operating modes of the air conditioning system to facilitate smooth switching of different operating modes.

[0079] In the embodiment, the second heat exchange pipeline 30 has a first connecting port and a second connecting port respectively located at two ends of the second heat exchange pipeline 30, one of the first connecting port and the second connecting port is a flow inlet of the second heat exchange pipeline 30, and the other is a flow outlet of the second heat exchange pipeline 30; the air conditioning system comprises a four-way valve 70, the four-way valve 70 has a first communicating port 71, a second communicating port 72, a third communicating port 73 and a fourth communicating port 74, the first communicating port 71 is selectively communicated or disconnected with the exhaust port 62 of the compressor 60, the second communicating port 72 is communicated with the first connecting port of the second heat exchange pipeline 30, the first communicating port 71 is communicated with the second communicating port 72, the third communicating port 73 is communicated with the suction port 61 of the compressor 60, the fourth communicating port 74 is communicated with the flow outlet of the first heat exchange pipeline 10, and the third communicating port 73 is communicated with the fourth communicating port 74. By adopting such a structure, the switching of different operation modes can be facilitated through the communication relationship of the four-way valve 70.

[0080] Specifically, the air conditioning system further comprises a first on-off valve 81, the first on-off valve 81 is arranged on a communication pipeline connecting the first communicating port 71 with the exhaust port 62 of the compressor 60, and the first on-off valve 81 is arranged in a selectively communicated or disconnected manner. In this way, the first communicating port 71 can be selectively communicated or disconnected with the exhaust port 62 of the compressor 60.

[0081] Specifically, the air conditioning system further comprises a second on-off valve 82, the second on-off valve 82 is arranged on the third heat exchange pipeline 51, and the second on-off valve 82 is arranged in a selectively communicated or disconnected manner. In this way, the communication and disconnection of the flow path of the third heat exchange pipeline 51 can be facilitated, so as to facilitate the switching of different modes.

[0082] Specifically, the air conditioning system further comprises a third on-off valve 83, the third on-off valve 83 is arranged on the second heat exchange pipeline 30, and the third on-off valve 83 is arranged in a selectively communicated or disconnected manner. In this way, the communication and disconnection of the flow path of the second heat exchange pipeline 30 can be facilitated, so as to facilitate the switching of different modes.

[0083] Specifically, the first on-off valve 81, the second on-off valve 82 and the third on-off valve 83 can all be electromagnetic valves.

[0084] Specifically, the air conditioning system further comprises a first electronic expansion valve 91, the first electronic expansion valve 91 is arranged on the first heat exchange pipeline 10, so as to throttle the refrigerant on the first heat exchange pipeline 10.

[0085] Specifically, the air conditioning system further comprises a second electronic expansion valve 92, the second electronic expansion valve 92 is arranged on the third heat exchange pipeline 51, so as to throttle the refrigerant on the third heat exchange pipeline 51.

[0086] Specifically, the air conditioning system further comprises a one-way valve 100 arranged on the third heat exchange pipeline 51 to enable the fluid in the third heat exchange pipeline 51 to flow from one end of the third heat exchange pipeline 51 to the other end of the third heat exchange pipeline 51. In this way, the fluid in the third heat exchange pipeline 51 can be prevented from flowing from the other end of the third heat exchange pipeline 51 to the one end of the third heat exchange pipeline 51, ensuring the unidirectionality of the flow direction of the third heat exchange pipeline 51, and thus effectively ensuring the heating of the water in the water tank 52 to facilitate the accurate switching to different operation modes.

[0087] The embodiment of the present application also provides a control method suitable for the air conditioning system provided above, which comprises: obtaining the current temperature Tw of the water tank 52 of the air conditioning system; controlling whether to heat the water tank 52 according to the current temperature Tw to control the communication relationship of the air conditioning system, so that the discharge port 62 of the compressor 60 of the air conditioning system is communicated with at least one of the flow inlet of the second heat exchange pipeline 30 and the flow inlet of the third heat exchange pipeline 51 of the air conditioning system, the suction port 61 of the compressor 60 is communicated with one of the flow outlet of the first heat exchange pipeline 10 and the flow outlet of the second heat exchange pipeline 30 of the air conditioning system, and the flow outlet of at least one of the first heat exchange pipeline 10, the second heat exchange pipeline 30 and the third heat exchange pipeline 51 for being communicated with the discharge port 62 of the compressor 60 is communicated with the flow inlet of one of the first heat exchange pipeline 10, the second heat exchange pipeline 30 and the third heat exchange pipeline 51 for being communicated with the suction port 61 of the compressor 60 to form a heat exchange circulation flow path. In this way, it can be facilitated to determine whether the water tank 52 needs to be heated according to the current temperature Tw of the water tank 52, and the communication relationship of the air conditioning system is controlled correspondingly to realize the heating or non-heating of the water tank 52.

[0088] In the embodiment, the control of whether to heat the water tank 52 according to the current temperature Tw to control the communication relationship of the air conditioning system comprises: comparing the current temperature Tw of the water tank 52 with a set maximum temperature h4; when Tw≥h4, the discharge port 62 of the compressor 60 is communicated with the flow inlet of the second heat exchange pipeline 30, the suction port 61 of the compressor 60 is communicated with the flow outlet of the first heat exchange pipeline 10, and the flow inlet of the first heat exchange pipeline 10 and the flow outlet of the second heat exchange pipeline 30 are communicated to form a heat exchange circulation flow path, so that the air conditioning system is in a normal refrigeration mode; when Tw

[0089] Specifically, when Tw < h4, the air conditioning system is used to heat the water tank 52, including: comparing the current temperature of the water tank 52 with the optimal heating temperature interval; when the current temperature of the water tank 52 is within the optimal heating temperature interval, the exhaust port 62 of the compressor 60 is communicated with the flow inlet of the third heat exchange pipeline 51, the suction port 61 of the compressor 60 is communicated with the flow outlet of the first heat exchange pipeline 10, and the flow inlet of the first heat exchange pipeline 10 and the flow outlet of the third heat exchange pipeline 51 are communicated to form a heat exchange circulation flow path, so that the air conditioning system is in a full heat recovery mode; when the current temperature of the water tank 52 is not within the optimal heating temperature interval, the exhaust port 62 of the compressor 60 is communicated with the flow inlet of the second heat exchange pipeline 30 and the flow inlet of the third heat exchange pipeline 51, the suction port 61 of the compressor 60 is communicated with the flow outlet of the first heat exchange pipeline 10, and the flow inlet of the first heat exchange pipeline 10, the flow outlet of the second heat exchange pipeline 30 and the flow outlet of the third heat exchange pipeline 51 are communicated to form a heat exchange circulation flow path, so that the air conditioning system is in a partial heat recovery mode. Specifically, the optimal heating temperature interval has a large temperature difference with the set maximum temperature, so that the water in the water tank 52 can fully absorb heat, and the water in the water tank 52 can be fully heated. When the current temperature of the water tank 52 is within the optimal heating temperature interval, it proves that the current temperature of the water tank 52 is low under this condition, so that the water in the water tank 52 can fully absorb heat, that is, in the full heat recovery mode, the water in the water tank 52 can fully absorb heat and ensure that the air conditioning system normally adjusts the temperature and / or humidity of the indoor air. When the current temperature of the water tank 52 is not within the optimal heating temperature interval, it proves that the current temperature of the water tank 52 is high under this condition, so that the heat of the refrigerant cannot be completely absorbed, and part of the heat of the refrigerant needs to be exchanged by the outdoor heat exchanger 40. Therefore, by using the partial heat recovery mode, the heating of the water in the water tank 52 can be ensured, and the adjustment effect of the air conditioning system on the temperature and / or humidity of the air can be effectively ensured.

[0090] In the embodiment, the control method further comprises: when the current temperature of the water tank 52 is within the optimal heat temperature range, controlling the air conditioning system to operate in the full heat recovery mode for a first preset time; and when the operation reaches the first preset time, entering an adjustment process of adjusting the connection relationship of the air conditioning system according to the indoor environment temperature where the air conditioning system is located and / or the current temperature of the water tank 52; when the current temperature of the water tank 52 is not within the optimal heat temperature range, controlling the air conditioning system to operate in the partial heat recovery mode for a second preset time; and when the operation reaches the second preset time, entering the adjustment process of adjusting the connection relationship of the air conditioning system according to the indoor environment temperature where the air conditioning system is located and / or the current temperature of the water tank 52. With such a setting mode, the connection relationship of the air conditioning system can be adjusted in combination with the adjustment effect of the air conditioning system on the indoor environment and the heating effect of the water in the water tank 52, so as to better ensure that the air conditioning system can effectively ensure the heating effect of the water in the water tank 52 and effectively ensure the adjustment effect on the temperature and / or humidity of the indoor environment. Specifically, the first preset time is bmin, that is, b minutes, and b represents a specific numerical value. "When the current temperature of the water tank 52 is within the optimal heat temperature range" corresponds to h1≤Tw

[0091] Specifically, the adjustment process comprises: obtaining the indoor environment temperature where the air conditioning system is located, and determining whether the indoor environment temperature is within a set temperature range; when the indoor environment temperature exceeds the set temperature range, controlling the air conditioning system to be in the partial heat recovery mode; and when the indoor environment temperature is within the set temperature range, adjusting the connection relationship of the air conditioning system according to the current temperature of the water tank 52. In this way, the water in the water tank 52 can be effectively heated under the premise of ensuring the control of the temperature of the indoor environment, and the connection relationship of the air conditioning system can be timely and adaptively adjusted in combination with the current temperature of the water tank 52 when the indoor environment temperature does not meet the set temperature range. Specifically, "when the indoor environment temperature is within the set temperature range" corresponds to T 设 +X℃>T 内 >T 设 -X℃, the indoor environment temperature is T 内 , and T 设 is a set temperature, and X is a preset difference permission value.

[0092] In the embodiment, when the indoor environment temperature is in the set temperature range, the connection relationship of the air conditioning system is adjusted according to the current temperature of the water tank 52, including: comparing the current temperature Tw of the water tank 52 with the heat recovery mode reserve maximum water temperature h3, h3 < h4, the heat recovery mode reserve maximum water temperature is greater than the optimal heat temperature interval; when Tw < h3, the air conditioning system is controlled to be in the partial heat recovery mode; when Tw ≥ h3, the connection relationship of the air conditioning system is adjusted according to the size of Tw and / or the time difference T0 between the current time and the time when the user concentrates on using hot water. In this way, it is convenient to select the corresponding heating mode according to the specific temperature difference condition, and when the current temperature of the water tank 52 does not reach the heat recovery mode reserve maximum water temperature, the water in the water tank 52 can be continuously heated through the partial heat recovery mode, and the adjustment effect of the air of the indoor environment is guaranteed at the same time; in addition, when the current temperature of the water tank 52 does not reach the heat recovery mode reserve maximum water temperature, the corresponding adjustment is made in combination with the user's use demand for hot water and / or the specific value of the current temperature, so as to find a suitable balance between the air conditioning system's adjustment of the air of the indoor environment and the heating demand of the hot water.

[0093] Specifically, the connection relationship of the air conditioning system is adjusted according to the size of Tw and / or the time difference between the current time and the time when the user concentrates on using hot water, including: comparing T0 with a preset time difference M; when T0 > M, the air conditioning system is controlled to be in the conventional refrigeration mode. When T0 ≤ M, the exhaust port 62 of the compressor 60 is communicated with the flow inlet of the third heat exchange pipeline 51, the suction port 61 of the compressor 60 is communicated with the flow outlet of the second heat exchange pipeline 30, and the flow inlet of the second heat exchange pipeline 30 and the flow outlet of the third heat exchange pipeline 51 are communicated to form a heat exchange circulation flow path, so that the air conditioning system is in the single hot water heating mode; and after the water is heated to the set water temperature T1 in the single hot water heating mode, the air conditioning system is switched to the conventional refrigeration mode. By using such a method, it is convenient to preferentially adjust the temperature and / or humidity of the air of the indoor environment through the conventional refrigeration mode when the time difference between the user's demand for hot water is large; and when the time difference between the user's demand for hot water is small, that is, when the user's demand for hot water is urgent, the supply of hot water is limited, and after the supply of hot water is met, the air conditioning system is switched to the conventional refrigeration mode, so as to avoid the case that the temperature and / or humidity of the indoor environment is excessively affected.

[0094] Specifically, when the indoor environment temperature is in the set temperature range, the control method further includes: controlling the indoor fan of the air conditioning system to run at a low speed. In this way, it is convenient to reduce the energy consumption of the air conditioning system as much as possible.

[0095] Specifically, when the indoor ambient temperature is within the set temperature range, the control method further includes: controlling the compressor 60 to operate at a low frequency for a third preset time, and then controlling the air conditioning system to cycle in a dehumidification mode with a preset duration, thereby minimizing energy consumption of the air conditioning system.

[0096] Specifically, the air conditioning thermal system in this embodiment includes an indoor air conditioner (including an indoor heat exchanger), an outdoor condenser (outdoor heat exchanger), a water heater (water tank 52), a compressor 60, a four-way valve 70, an electronic expansion valve, a solenoid valve, and the like. When the air conditioning system enters dehumidification mode, it switches between various operating modes to dehumidify and cool the indoor environment, improving living comfort. While intelligently controlling the indoor temperature, it also recovers condensation heat to pre-store domestic hot water, effectively utilizing the entire house's thermal energy, improving energy efficiency, and reducing the air conditioning system's impact on the surrounding environment.

[0097] System operation mode 1 (also known as conventional cooling mode): The user only needs indoor dehumidification and cooling, which is equivalent to an air conditioner;

[0098] System operation mode 2 (also known as full heat recovery mode): There is a demand for dehumidification and cooling, and at the same time there is a demand for hot water (full heat recovery mode). At this time, the water temperature is in the optimal heating range for heat recovery, and all the condensation heat in the room is recovered to prepare hot water, and the system heat recovery operation efficiency is the highest;

[0099] System operation mode three (also known as partial heat recovery mode): There is a demand for dehumidification and cooling, and at the same time there is a demand for hot water (partial heat recovery mode). At this time, the water temperature is high, and the system efficiency is low when using the full heat recovery mode. Part of the indoor condensation heat is recovered to prepare hot water, and the outdoor unit assists in heat dissipation, improving the indoor dehumidification and cooling effect. The system heat recovery efficiency is moderate;

[0100] System operation mode 4 (also known as single hot water mode): The user only needs hot water, which is equivalent to an air-energy water heater. At this time, the system has the highest hot water production efficiency;

[0101] like Figure 5 As shown, the user can freely choose between the above system operation mode 1 and system operation mode 4 according to their needs. For example, if the user chooses to enter the air conditioning dehumidification mode, the system control logic is as follows:

[0102] After the air conditioner is turned on for cooling, the current water heater temperature Tw is detected and compared with the water temperature h4. The operation mode is matched according to the comparison result as the basis for entering the next process:

[0103] If Tw > h4, it is judged that the water temperature in the water heater (the water heater includes the water tank 52) is too high, there is no expected temperature rise margin, the air conditioning heat recovery mode system has a lower operating efficiency, and it is not suitable to operate. At this time, the system enters operation mode one air conditioning refrigeration operation, the first electromagnetic valve and the third electromagnetic valve are opened, the second electromagnetic valve is closed, the second electronic expansion valve 92 adjusts the flow, the air conditioning outdoor unit operates freely, the compressor 60 operates according to the default frequency range in the dehumidification mode, and the indoor fan operates according to the default rotating speed. The intelligent control room temperature.

[0104] If Tw < h4, it is judged that the water temperature in the water heater is suitable, and the air conditioning heat recovery mode can be used. At the same time, the water temperature of the water heater and the best temperature interval h1 and h2 of the heat recovery are compared, and different heat recovery operation modes are selected according to the comparison result as the basis for entering the next process.

[0105] If h1 ≤ Tw < h2, it is judged that the water temperature in the water heater is in the best temperature interval of the heat recovery mode. At this time, the system enters operation mode two full heat recovery dehumidification operation, the second electromagnetic valve is opened, the first electromagnetic valve and the third electromagnetic valve are closed, the first electronic expansion valve 91 and the second electronic expansion valve 92 adjust the flow, the air conditioning outdoor unit is stopped, and all refrigerants flow through the water heater to heat and recover all condensing heat to prepare hot water. At this time, the heat recovery system has the highest operating efficiency. After the system operates for b min, it is detected whether the current indoor temperature meets T 设 +X℃ > T 内 > T 设 -X℃ range, and the comparison result is used as the basis for entering the next process.

[0106] If h1 ≤ Tw < h2 is not met, it is judged that the water temperature in the water heater is not in the best temperature interval of the heat recovery mode. At this time, the system enters a partial heat recovery mode with a higher operating efficiency, and the outdoor unit needs to assist in heat dissipation to ensure the indoor dehumidification and cooling effect. After the system operates for a min, it is detected whether the current indoor temperature meets T 设 +X℃ > T 内 > T 设 -X℃ temperature range, and the comparison result is used as the basis for entering the next process.

[0107] If the current indoor temperature does not meet T 设 +X℃ > T 内 > T 设 -X℃ temperature range, the system enters operation mode three partial heat recovery operation.

[0108] If the current indoor temperature meets T 设 +X℃ > T 内 > T 设- X ℃ temperature range, at this time the inner fan is adjusted to low speed, the compressor 60 is low frequency, and after c min, the dehumidification mode is cycled with d min as a period, while detecting the current water heater water temperature and h3 water temperature (the highest water temperature reserved in the heat recovery mode), and the comparison result is used as the basis for entering the next process:

[0109] If Tw < h3, the system continues to enter the third part of the heat recovery operation mode.

[0110] If Tw ≥ h3, it is judged whether the water heater preheating water temperature requirement is met. If the water temperature requirement is met, the ordinary heat recovery heating mode is used in the case of high water temperature, which has low energy efficiency and long heating time (operation mode two or operation mode three). At this time, the system enters the fourth operation mode to prepare hot water more efficiently. The system detects the time difference between the current time and the daily concentrated use of hot water by the user and M, and the comparison result is used as the basis for entering the next process:

[0111] If the time difference between the current time and the daily concentrated use of hot water by the user is greater than M, the system enters the first operation mode of air conditioning refrigeration dehumidification operation, controls the first electromagnetic valve and the third electromagnetic valve to open, the second electromagnetic valve to close, and the second electronic expansion valve 92 to adjust the flow, and the air conditioning outdoor unit to run freely, the compressor 60 to run according to the default frequency range of the dehumidification mode, and the inner fan to run at the default speed, and the room temperature to be intelligently controlled.

[0112] If the time difference between the current time and the daily concentrated use of hot water by the user is less than or equal to M, the system enters the fourth operation mode, controls the second electromagnetic valve and the third electromagnetic valve to open, the first electromagnetic valve to close, and the second electronic expansion valve 92 to close, and the first electronic expansion valve 91 to adjust the flow. At this time, the air conditioning indoor unit is on standby, the air conditioning outdoor unit is freely running, the efficiency is the highest, which is equivalent to an air source heat pump water heater, and all the condensing heat is used for heating water. When it is detected that the water temperature Tw of the water heater reaches the user-set water temperature T1, the system enters the first operation mode of air conditioning refrigeration dehumidification operation.

[0113] Specifically, the range of h1 is 13-17 ℃ (including the end point temperature values 13 ℃ and 17 ℃); the range of h2 is 45-53 ℃ (including the end point temperature values 45 ℃ and 53 ℃); the range of h3 is 54-55 ℃ (including the end point temperature values 54 ℃ and 44 ℃); the range of h4 is 58-62 ℃ (including the end point temperature values 58 ℃ and 62 ℃); T 设is the user air conditioner set temperature (reference range 16-30℃, including end point temperature values 16℃ and 30℃); X is in the range of 2-3℃ (including end point temperature values 2℃ and 3℃); a is in the range of 4-6min (including end point temperature values 4min and 6min); b is in the range of 17-23min (including end point temperature values 17min and 23min); c is in the range of 27-33min (including end point temperature values 27min and 33min); d is in the range of 110-130min (including end point temperature values 110min and 120min); M is in the range of 27-33min (including end point temperature values 27min and 33min).

[0114] Preferably, h1 = 15℃; h2 = 50℃; h3 = 55℃; h4 = 60℃; the set temperature range is T 设 (reference range 16-30℃); X℃ = 2.5℃; a = 5min; b = 20min; c = 30min; d = 120min; M = 30min.

[0115] From the above description, it can be seen that the above-mentioned embodiments of the present application achieve the following technical effects: The existing air conditioner refrigeration dehumidification mode runs for a long time in special weather, which consumes a large amount of electric energy, resulting in an increase in electricity charges, which is not a small expense for many families. In addition, due to the lack of intelligent control function, it is difficult for the air conditioner to maintain a constant comfortable environment during a long running process, especially in the case of large weather changes, the indoor temperature and humidity are often difficult to reach the ideal level. After the system enters the conventional refrigeration mode, through the switching of the system running mode, it can provide a constant comfortable environment for the user in special weather such as plum rain and back to the south, and also reserves the condensation heat generated in advance for life hot water, realizes the effective utilization of whole house heat energy, improves the energy utilization rate, and reduces the influence of the air conditioning system on the surrounding environment.

[0116] It should be noted that the terms used herein are only intended to describe specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that, when the terms "comprise" and / or "include" are used in the specification, they indicate the presence of the features, steps, operations, devices, components and / or combinations thereof.

[0117] The foregoing is considered as illustrative only of the principles of the application. Other variations and modifications are possible in light of the above teachings. Therefore, the scope of the application is not intended to be limited to the particular embodiments described herein but is to be accorded the broadest scope consistent with the principles and the scope of the appended claims and equivalents thereof. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure and will not be interpreted in an overly literal sense unless expressly so defined herein.

[0118] In the description of the present application, it is to be understood that the orientation or positional relationships indicated by terms such as "front", "back", "up", "down", "left", "right", "lateral", "vertical", "horizontal", "top", "bottom", and the like are generally based on the orientation or positional relationships shown in the drawings, and are merely intended to facilitate the description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore cannot be construed as limiting the scope of protection of the present application. The orientation terms "inner", "outer" refer to the inner and outer relative to the contour of the components themselves.

[0119] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper", and the like can be used herein to describe the spatial positional relationship of one device or feature with respect to other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the devices described in the drawings. For example, if the devices in the drawings are inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" the other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0120] In addition, it should be noted that the use of the terms "first", "second", and the like do not have a special meaning and are merely used to distinguish the corresponding parts, and therefore cannot be construed as limiting the scope of protection of the present application.

[0121] The above merely provides the preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the principles and technical scope of the present application shall fall into the scope of the present application.

Claims

1. An air conditioning system, characterized in that: include: A first heat exchange pipeline (10) and an indoor heat exchanger (20) disposed on the first heat exchange pipeline (10) and in communication with the first heat exchange pipeline (10); a second heat exchange pipeline (30) and an outdoor heat exchanger (40) disposed on the second heat exchange pipeline (30) and in communication with the second heat exchange pipeline (30); a third heat exchange pipeline (51) and a water tank (52) for exchanging heat with the third heat exchange pipeline (51); A compressor (60), the compressor (60) having an intake port (61) and an exhaust port (62), the exhaust port (62) of the compressor (60) being selectively connected to at least one of the inlet of the second heat exchange pipeline (30) and the inlet of the third heat exchange pipeline (51), the intake port (61) of the compressor (60) being selectively connected to the outlet of the first heat exchange pipeline (10) and one of the outlets of the second heat exchange pipeline (30), at least one outlet of the first heat exchange pipeline (10), the second heat exchange pipeline (30) and the third heat exchange pipeline (51) for connecting with the exhaust port (62) of the compressor (60) is connected to one inlet of the first heat exchange pipeline (10), the second heat exchange pipeline (30) and the third heat exchange pipeline (51) for connecting with the intake port (61) of the compressor (60) to form a heat exchange circulation flow path.

2. The air conditioning system according to claim 1, characterized in that The air conditioning system has a conventional cooling mode, a full heat recovery mode, a partial heat recovery mode and a hot water only mode; When the air-conditioning system is in the conventional cooling mode, the exhaust port (62) of the compressor (60) is in communication with the inlet port of the second heat exchange pipeline (30), the air intake port (61) of the compressor (60) is in communication with the outlet port of the first heat exchange pipeline (10), and the inlet port of the first heat exchange pipeline (10) and the outlet port of the second heat exchange pipeline (30) are in communication to form a heat exchange circulation flow path; When the air conditioning system is in the full heat recovery mode, the exhaust port (62) of the compressor (60) is in communication with the inlet port of the third heat exchange pipeline (51), the air intake port (61) of the compressor (60) is in communication with the outlet port of the first heat exchange pipeline (10), and the inlet port of the first heat exchange pipeline (10) and the outlet port of the third heat exchange pipeline (51) are in communication to form a heat exchange circulation flow path; When the air-conditioning system is in the partial heat recovery mode, the exhaust port (62) of the compressor (60) is in communication with the inlet of the second heat exchange pipeline (30) and the inlet of the third heat exchange pipeline (51), the air intake port (61) of the compressor (60) is in communication with the outlet of the first heat exchange pipeline (10), and the inlet of the first heat exchange pipeline (10), the outlet of the second heat exchange pipeline (30) and the outlet of the third heat exchange pipeline (51) are in communication to form a heat exchange circulation flow path; When the air-conditioning system is in the hot water only mode, the exhaust port (62) of the compressor (60) is connected to the inlet of the third heat exchange pipeline (51), the air intake port (61) of the compressor (60) is connected to the outlet of the second heat exchange pipeline (30), and the inlet of the second heat exchange pipeline (30) and the outlet of the third heat exchange pipeline (51) are connected to form a heat exchange circulation flow path.

3. The air conditioning system according to claim 2, characterized in that The second heat exchange pipeline (30) has a first connection port and a second connection port respectively located at both ends of the second heat exchange pipeline (30), one of the first connection port and the second connection port is an inlet of the second heat exchange pipeline (30), and the other is an outlet of the second heat exchange pipeline (30); when the air-conditioning system is in the conventional cooling mode, the full heat recovery mode and the partial heat recovery mode, the fluid in the second heat exchange pipeline (30) flows from the first connection port to the second connection port; when the air-conditioning system is in the single hot water mode, the fluid in the second heat exchange pipeline (30) flows from the second connection port to the first connection port.

4. The air conditioning system according to claim 1, characterized in that The second heat exchange pipeline (30) has a first connection port and a second connection port respectively located at both ends of the second heat exchange pipeline (30), one of the first connection port and the second connection port being an inlet of the second heat exchange pipeline (30), and the other being an outlet of the second heat exchange pipeline (30); the air conditioning system comprises: A four-way valve (70) having a first communication port (71), a second communication port (72), a third communication port (73) and a fourth communication port (74); the first communication port (71) can be selectively connected to or disconnected from the exhaust port (62) of the compressor (60); the second communication port (72) is connected to the first connection port of the second heat exchange pipeline (30); the first communication port (71) is connected to the second communication port (72); the third communication port (73) is connected to the intake port (61) of the compressor (60); the fourth communication port (74) is connected to the outflow port of the first heat exchange pipeline (10); and the third communication port (73) is connected to the fourth communication port (74).

5. The air conditioning system according to claim 4, characterized in that The air conditioning system further comprises: a first switch valve (81) provided on a communication pipeline connecting the first communication port (71) and the exhaust port (62) of the compressor (60), wherein the first switch valve (81) can be connected or disconnected; and / or A second on-off valve (82) is provided on the third heat exchange pipeline (51), and the second on-off valve (82) can be connected or disconnected; and / or, The third switch valve (83) is arranged on the second heat exchange pipeline (30), and the third switch valve (83) can be connected or disconnected.

6. The air conditioning system according to claim 4, characterized in that The air conditioning system further comprises: a first electronic expansion valve (91), arranged on the first heat exchange pipeline (10); and / or, a second electronic expansion valve (92), arranged on the third heat exchange pipeline (51); and / or, A one-way valve (100) is provided on the third heat exchange pipeline (51) to allow the fluid in the third heat exchange pipeline (51) to flow along one end of the third heat exchange pipeline (51) to the other end of the third heat exchange pipeline (51).

7. A control method, characterized in that: Applicable to the air conditioning system according to any one of claims 1 to 6, the control method comprising: Obtaining the current temperature Tw of the water tank of the air conditioning system; Whether to heat the water tank is controlled according to the current temperature Tw to control the connectivity of the air-conditioning system, so that the exhaust port of the compressor of the air-conditioning system is connected to at least one of the inlet of the second heat exchange pipeline of the air-conditioning system and the inlet of the third heat exchange pipeline of the air-conditioning system, so that the intake port of the compressor is connected to the outflow port of the first heat exchange pipeline of the air-conditioning system and one of the outflow port of the second heat exchange pipeline, and at least one outflow port of the first heat exchange pipeline, the second heat exchange pipeline and the third heat exchange pipeline for connecting with the exhaust port of the compressor is connected to the inflow port of one of the first heat exchange pipeline, the second heat exchange pipeline and the third heat exchange pipeline for connecting with the intake port of the compressor to form a heat exchange circulation flow path.

8. The control method according to claim 7, characterized in that: The controlling whether to heat the water tank according to the current temperature Tw to control the connectivity of the air-conditioning system includes: Compare the current temperature Tw of the water tank with the set maximum temperature h4; When the current temperature Tw of the water tank is greater than or equal to the set maximum temperature h4, the exhaust port of the compressor is connected to the inlet of the second heat exchange pipeline, the intake port of the compressor is connected to the outlet of the first heat exchange pipeline, and the inlet of the first heat exchange pipeline and the outlet of the second heat exchange pipeline are connected to form a heat exchange circulation flow path, so that the air conditioning system is in a normal cooling mode; When the current temperature Tw of the water tank is lower than the set maximum temperature h4, the air conditioning system is configured to heat the water tank.

9. The control method according to claim 8, characterized in that: When the current temperature Tw of the water tank is lower than the set maximum temperature h4, the air conditioning system is configured to heat the water tank, including: Comparing the current temperature Tw of the water tank with the optimal thermal temperature range; When the current temperature Tw of the water tank is within the optimal thermal temperature range, the exhaust port of the compressor is connected to the inlet of the third heat exchange pipeline, the intake port of the compressor is connected to the outlet of the first heat exchange pipeline, and the inlet of the first heat exchange pipeline is connected to the outlet of the third heat exchange pipeline to form a heat exchange circulation flow path, so that the air conditioning system is in full heat recovery mode; When the current temperature Tw of the water tank is not within the optimal thermal temperature range, the exhaust port of the compressor is connected to the inlet of the second heat exchange pipeline and the inlet of the third heat exchange pipeline, the intake port of the compressor is connected to the outlet of the first heat exchange pipeline, and the inlet of the first heat exchange pipeline, the outlet of the second heat exchange pipeline and the outlet of the third heat exchange pipeline are connected to form a heat exchange circulation flow path, so that the air-conditioning system is in partial heat recovery mode.

10. The control method according to claim 9, characterized in that: The control method further includes: When the current temperature of the water tank is within the optimal thermal temperature range, the air-conditioning system is controlled to operate in the full heat recovery mode for a first preset time; and when the operation reaches the first preset time, a regulation process is entered to regulate the connectivity of the air-conditioning system according to the indoor ambient temperature of the air-conditioning system and / or the current temperature of the water tank; When the current temperature of the water tank is not in the optimal thermal temperature range, the air-conditioning system is controlled to operate in the partial heat recovery mode for a second preset time; and when the operation reaches the second preset time, an adjustment process is entered to adjust the connectivity relationship of the air-conditioning system according to the indoor ambient temperature of the air-conditioning system and / or the current temperature of the water tank.

11. The control method according to claim 10, characterized in that: The adjustment process includes: Obtaining the indoor ambient temperature of the air conditioning system, and determining whether the indoor ambient temperature is within a set temperature range; When the indoor ambient temperature exceeds the set temperature range, controlling the air conditioning system to be in the partial heat recovery mode; When the indoor ambient temperature is within the set temperature range, the connectivity relationship of the air-conditioning system is adjusted according to the current temperature of the water tank.

12. The control method according to claim 11, characterized in that: When the indoor ambient temperature is within the set temperature range, adjusting the connectivity of the air conditioning system according to the current temperature of the water tank includes: Comparing the current temperature Tw of the water tank with the maximum water temperature h3 reserved in the heat recovery mode, h3 < h4, the maximum water temperature reserved in the heat recovery mode is greater than the optimal heat temperature range; When Tw<h3, controlling the air conditioning system to be in the partial heat recovery mode; When Tw≥h3, the connectivity of the air conditioning system is adjusted according to the current temperature Tw of the water tank and / or the time difference T0 between the current time and the time when users use hot water intensively.

13. The control method according to claim 12, characterized in that: The adjusting the connectivity of the air-conditioning system according to the current temperature Tw of the water tank and / or the time difference between the current time and the time when users use hot water intensively includes: Compare T0 with the preset time difference M; When T0>M, controlling the air conditioning system to be in the conventional cooling mode; When T0≤M, the exhaust port of the compressor is controlled to be connected to the inlet of the third heat exchange pipeline, the intake port of the compressor is controlled to be connected to the outlet of the second heat exchange pipeline, and the inlet of the second heat exchange pipeline is connected to the outlet of the third heat exchange pipeline to form a heat exchange circulation flow path, so that the air-conditioning system is in the hot water only mode; and after the water is heated to the set water temperature T1 in the hot water only mode, the air-conditioning system is controlled to switch to the conventional cooling mode.

14. The control method according to claim 11, characterized in that: When the indoor ambient temperature is within the set temperature range, the control method further includes: Controlling the indoor fan of the air conditioning system to operate at a low speed; and / or, After controlling the compressor to operate at a low frequency for a third preset time, controlling the air conditioning system to perform a dehumidification mode cyclic operation with a preset time period as a cycle.

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