Air conditioning system and control method thereof

Abstract

The invention relates to the technical field of air conditioning systems, in particular to an air conditioning system and a control method thereof.The air conditioning system comprises a compressor, a first four-way valve, a switching valve, a first heat exchanger, an indoor heat exchanger and an outdoor heat exchanger which are sequentially connected through a refrigerant circulation loop; wherein the first heat exchanger exchanges heat with the floor heating pipeline; a first three-way valve, a second three-way valve, a first throttling device and a second throttling device are further arranged on the refrigerant circulation loop, and the second three-way valve is connected with the switching valve through a second pipeline; the first three-way valve is connected with the first heat exchanger, the indoor heat exchanger and the outdoor heat exchanger. The first throttling device is arranged between the first heat exchanger and the first three-way valve; the second three-way valve is connected with the first four-way valve, the indoor heat exchanger and the switching valve, and the second throttling device is arranged between the indoor heat exchanger and the first three-way valve. Heat dehumidification is achieved through floor heating and the indoor heat exchanger, refrigeration can be achieved at the same time, the structure is simple, and the cost is low.

Description

Technical Field

[0001] The present invention relates to the technical field of air-conditioning systems, and specifically provides an air-conditioning system and a control method of the air-conditioning system. Background Art

[0002] With the development of smart homes, the design of air conditioners is more energy-saving and environmentally friendly, and user needs are also developing in a diversified direction. In winter, the room temperature is low, and the indoor heating is generally provided by floor heating pipes. Therefore, the existing air conditioning system is set to heat the floor heating pipes during heating. However, in real life, especially in the southern region, the humidity is high in winter. In order to ensure comfort, an additional dehumidifier is needed to dehumidify the room while the air conditioning floor heating is used for heating, which makes the cost higher.

[0003] Accordingly, the art needs a new air conditioning system to solve the problem that the existing air conditioning system cannot reduce the indoor humidity while providing heat for floor heating. Summary of the invention

[0004] The present invention aims to solve the above technical problem, that is, to solve the problem that the existing air-conditioning system cannot reduce the indoor humidity while providing heat for floor heating.

[0005] In a first aspect, the present invention provides an air conditioning system, comprising a compressor, a first four-way valve, a switching valve, a first heat exchanger, an indoor heat exchanger and an outdoor heat exchanger connected in sequence through a refrigerant circulation loop; wherein the first heat exchanger exchanges heat with a floor heating pipeline;

[0006] A first three-way valve, a second three-way valve, a first throttling device and a second throttling device are also provided on the refrigerant circulation circuit, and the second three-way valve and the switching valve are connected via a second pipeline;

[0007] The first three-way valve is connected to the first heat exchanger, the indoor heat exchanger and the outdoor heat exchanger respectively; the first throttling device is arranged between the first heat exchanger and the first three-way valve;

[0008] The second three-way valve is respectively connected to the first four-way valve, the indoor heat exchanger and the switching valve; the second throttling device is arranged between the indoor heat exchanger and the first three-way valve.

[0009] When the above technical solution is adopted, the air-conditioning system of the present invention can not only realize heating and cooling through floor heating and indoor heat exchanger during heating, but also realize dehumidification during heating. The structure is not only simple but also low-cost, which greatly improves the user experience.

[0010] In an optional technical solution of the above-mentioned air-conditioning system, the air-conditioning system also includes a second heat exchanger, which is arranged on the refrigerant circulation loop and located between the compressor outlet and the first four-way valve; wherein the second heat exchanger exchanges heat with the hot water pipeline.

[0011] When the above technical solution is adopted, the air-conditioning system of the present invention can not only achieve thermal dehumidification through floor heating and indoor heat exchanger during heating, but also achieve cooling. The structure is not only simple but also low-cost, which greatly improves the user experience.

[0012] In an optional technical solution of the above air-conditioning system, the air-conditioning system further includes a filter, which is arranged on the refrigerant circulation loop and located between the first heat exchanger and the first three-way valve.

[0013] When the above technical solution is adopted, the filter filters the impurities in the refrigerant.

[0014] In an optional technical solution of the above-mentioned air-conditioning system, the air-conditioning system further includes a liquid storage tank, which is arranged on the refrigerant circulation loop and located between the filter and the first heat exchanger.

[0015] When the above technical solution is adopted, the liquid storage tank can release or absorb the refrigerant, play a buffering role, ensure the stable supply of refrigerant in the system, maintain the relative stability of the system pressure, and thus ensure that the air-conditioning system can operate continuously and stably.

[0016] In an optional technical solution of the above-mentioned air-conditioning system, the air-conditioning system further includes a gas-liquid separator, which is arranged on the refrigerant circulation loop and located at the return air port of the compressor.

[0017] When the above technical solution is adopted, the gas-liquid separator separates the refrigerant before the compressor return air port.

[0018] In a second aspect, the present invention further provides a control method for an air conditioning system, the air conditioning system comprising a compressor, a first four-way valve, a switching valve, a first heat exchanger, an indoor heat exchanger and an outdoor heat exchanger connected in sequence through a refrigerant circulation loop; wherein the first heat exchanger exchanges heat with a floor heating pipeline;

[0019] A first three-way valve, a second three-way valve, a first throttling device and a second throttling device are also provided on the refrigerant circulation circuit, and the second three-way valve and the switching valve are connected via a second pipeline;

[0020] The first three-way valve is connected to the first heat exchanger, the indoor heat exchanger and the outdoor heat exchanger respectively; the first throttling device is arranged between the first heat exchanger and the first three-way valve;

[0021] The second three-way valve is respectively connected to the first four-way valve, the indoor heat exchanger and the switching valve; the second throttling device is arranged between the indoor heat exchanger and the first three-way valve;

[0022] The control method comprises:

[0023] Receive indoor heating command;

[0024] Controlling the first four-way valve and the switching valve to switch the compressor outlet to communicate with the first heat exchanger, and the outdoor heat exchanger to communicate with the compressor return port;

[0025] The first three-way valve is controlled to switch to connect the first heat exchanger and the outdoor heat exchanger.

[0026] When the above technical solution is adopted, when indoor heating is needed in winter, the air-conditioning system operates in heating mode, and the first four-way valve and the switching valve are switched to connect the compressor outlet and the first heat exchanger, and connect the outdoor heat exchanger and the compressor return air port.

[0027] Specifically, the high-temperature and high-pressure refrigerant at the compressor outlet enters the first four-way valve and then the switching valve, then enters the first heat exchanger to heat the floor heating pipeline, and then enters the first throttling device for throttling.

[0028] When dehumidification is not turned on indoors, the first three-way valve is switched to the GA end to connect the first heat exchanger and the outdoor heat exchanger. The refrigerant enters the outdoor heat exchanger through the first three-way valve for heat exchange, and then returns to the compressor return port through the first four-way valve.

[0029] In an optional technical solution of the control method of the air conditioning system, the control method further includes:

[0030] Receiving an instruction for indoor cooling;

[0031] Controlling the first four-way valve and the switching valve to switch the compressor air outlet to communicate with the outdoor heat exchanger, and the indoor heat exchanger to communicate with the compressor air return port;

[0032] The first three-way valve is controlled to switch to connect the first heat exchanger with the indoor heat exchanger; the second three-way valve is controlled to switch to connect the indoor heat exchanger with the switching valve.

[0033] In the case of adopting the above technical solution, when the user needs indoor cooling in summer, the air conditioner operates in cooling mode. The first four-way valve and the switching valve are controlled to switch to connect the compressor outlet with the outdoor heat exchanger, and the indoor heat exchanger with the compressor return air port. The first three-way valve is controlled to switch to the AB end to connect the outdoor heat exchanger with the indoor heat exchanger. The second three-way valve is switched to the ED end to connect the indoor heat exchanger and the switching valve. The refrigerant at the compressor outlet enters the first four-way valve, and then enters the outdoor heat exchanger. After heat exchange with the outdoor environment, it enters the first three-way valve. The refrigerant passes through the second throttling device to throttle down the temperature and pressure, and then enters the indoor heat exchanger. The indoor heat exchanger absorbs heat and evaporates, condenses the air, and dehumidifies the room. Then the refrigerant enters the switching valve through the second three-way valve, returns to the first four-way valve, and returns to the compressor.

[0034] In an optional technical solution of the control method of the air conditioning system, the control method further includes:

[0035] The air conditioner receives a command to operate the dehumidification function when heating;

[0036] Get the indoor humidity value;

[0037] When the indoor humidity value is greater than or equal to a first preset humidity value, controlling the first three-way valve to switch to connect the first heat exchanger with the indoor heat exchanger;

[0038] The second three-way valve is controlled to switch to connect the indoor heat exchanger and the first four-way valve.

[0039] In the case of adopting the above technical solution, when the dehumidification is turned on indoors with high humidity, the first three-way valve is controlled to switch to the GB end to connect the first heat exchanger and the indoor heat exchanger. The second three-way valve is switched to the EC end to connect the indoor heat exchanger and the first four-way valve 31. Therefore, the refrigerant throttled by the first throttling device passes through the first three-way valve and enters the second throttling device for secondary throttling, cooling and reducing pressure, and then the refrigerant enters the indoor heat exchanger, and the indoor hanging unit dehumidifies the room to improve the indoor comfort.

[0040] In an optional technical solution of the control method of the air conditioning system, the control method further includes:

[0041] When the first preset humidity value>the indoor humidity value>the second preset humidity value, the first three-way valve is controlled to switch to connect the first heat exchanger with the indoor heat exchanger and the outdoor heat exchanger respectively.

[0042] In the case of adopting the above technical solution, after the indoor humidity has stabilized at a relatively low state, the first three-way valve is controlled to switch to the GA end and the GB end, so that the first heat exchanger is connected to the outdoor heat exchanger and the indoor heat exchanger respectively. The second three-way valve is switched to the EC end to connect the indoor heat exchanger and the first four-way valve. Therefore, after the refrigerant throttled by the first throttling device passes through the first three-way valve, a part of it enters the second throttling device for secondary throttling, cooling and reducing pressure, and then the refrigerant enters the indoor heat exchanger, and the indoor hanging machine dehumidifies the room to improve the indoor comfort. The other part of the refrigerant enters the outdoor heat exchanger for heat exchange and returns to the compressor return port through the first four-way valve.

[0043] In an optional technical solution of the control method of the above air-conditioning system, when the indoor humidity value is ≤ the second preset humidity value, the first three-way valve is controlled to switch to connect the first heat exchanger with the outdoor heat exchanger.

[0044] In the case of adopting the above technical solution, after the indoor humidity is further reduced, the first three-way valve is switched to the GA end to connect the first heat exchanger with the outdoor heat exchanger. Only heat is exchanged through the outdoor unit, and the indoor air is not dehumidified while heating the floor heating.

[0045] It can be understood by those skilled in the art that the air conditioning system of the present invention includes a compressor, a first four-way valve, a switching valve, a first heat exchanger, an indoor heat exchanger and an outdoor heat exchanger which are sequentially connected through a refrigerant circulation loop. Among them, the first heat exchanger exchanges heat with the floor heating pipeline. The refrigerant circulation loop is also provided with a first three-way valve, a second three-way valve, a first throttling device and a second throttling device. The second three-way valve and the switching valve are connected through a second pipeline.

[0046] The first three-way valve is respectively connected to the first heat exchanger, the indoor heat exchanger and the outdoor heat exchanger. The first throttling device is arranged between the first heat exchanger and the first three-way valve. The second three-way valve is respectively connected to the first four-way valve, the indoor heat exchanger and the switching valve. The second throttling device is arranged between the indoor heat exchanger and the first three-way valve.

[0047] When the above technical solution is adopted, the air-conditioning system of the present invention can not only realize heating and cooling through floor heating and indoor heat exchanger during heating, but also realize dehumidification during heating. The structure is not only simple but also low-cost, which greatly improves the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0049] Figure 1 is a schematic diagram of the refrigerant flow direction of the air conditioning system of the present invention when heating;

[0050] Figure 2It is a schematic diagram of the refrigerant flow direction during dehumidification of the air conditioning system of the present invention;

[0051] Figure 3 is a schematic diagram of the refrigerant flow direction of the air conditioning system of the present invention during thermal dehumidification;

[0052] Figure 4 is a schematic diagram of the refrigerant flow direction during refrigeration of the air-conditioning system of the present invention;

[0053] Figure 5 is a flowchart of one embodiment of a method for controlling an air conditioning system of the present invention;

[0054] Figure 6 It is a flowchart of another embodiment of the control method of the air conditioning system of the present invention.

[0055] List of reference numerals:

[0056] 1. compressor; 11. gas-liquid separator; 2. first heat exchanger; 31. first four-way valve; 32. second four-way valve; 4. second heat exchanger; 51. indoor heat exchanger; 52. outdoor heat exchanger;

[0057] 61. First three-way valve; 62. Second three-way valve;

[0058] 71. first throttling device; 72. second throttling device;

[0059] 8. Liquid storage tank; 9. Filter. DETAILED DESCRIPTION

[0060] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0061] It should be noted that, in the description of the present invention, the terms “first” and “second” are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0062] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0063] Reference Figure 1In order to solve the problem that the existing air conditioning system cannot reduce the indoor humidity while providing heat for floor heating, the air conditioning system of the present invention includes a compressor 1, a first four-way valve 31, a switching valve, a first heat exchanger 2, an indoor heat exchanger 51 and an outdoor heat exchanger 52 connected in sequence through a refrigerant circulation loop. Among them, the first heat exchanger 2 exchanges heat with the floor heating pipeline. The first three-way valve 61, the second three-way valve 62, the first throttling device 71 and the second throttling device 72 are also arranged on the refrigerant circulation loop. The second three-way valve 62 and the switching valve are connected through a second pipeline.

[0064] The first three-way valve 61 is respectively connected to the first heat exchanger 2, the indoor heat exchanger 51 and the outdoor heat exchanger 52. The first throttling device 71 is arranged between the first heat exchanger 2 and the first three-way valve 61. The second three-way valve 62 is respectively connected to the first four-way valve 61, the indoor heat exchanger 51 and the switching valve. The second throttling device 72 is arranged between the indoor heat exchanger 51 and the first three-way valve 61.

[0065] The advantage of the above arrangement is that when indoor heating is needed in winter, the air conditioning system operates in heating mode, and the first four-way valve 31 and the switching valve are switched to connect the compressor outlet and the first heat exchanger 2, and connect the outdoor heat exchanger 52 and the compressor return air port.

[0066] Specifically, the high-temperature and high-pressure refrigerant at the compressor outlet enters the first four-way valve 31 and then the switching valve, and then enters the first heat exchanger 2 to heat the floor heating pipeline, and then enters the first throttling device 71 for throttling.

[0067] Further, refer to Figure 1 When the indoor dehumidification is not turned on, the first three-way valve 61 is switched to the GA end to connect the first heat exchanger 2 and the outdoor heat exchanger 52, and the refrigerant enters the outdoor heat exchanger 52 through the first three-way valve 61 for heat exchange, and then returns to the compressor return port through the first four-way valve 31.

[0068] Reference Figure 2 When the dehumidification is turned on indoors with high humidity, the first three-way valve 61 is controlled to switch to the GB end to connect the first heat exchanger 2 and the indoor heat exchanger 51. The second three-way valve 62 is switched to the EC end to connect the indoor heat exchanger 51 and the first four-way valve 31. Therefore, the refrigerant throttled by the first throttling device 71 passes through the first three-way valve 61 and enters the second throttling device 72 for secondary throttling, cooling and reducing pressure to form a certain saturated refrigerant, and then the refrigerant enters the indoor heat exchanger 51, the indoor heat exchanger 51 evaporates and absorbs heat, and the high-humidity air is cooled to produce condensed water, so as to dehumidify the room and improve the indoor comfort.

[0069] Reference Figure 3After the indoor humidity has stabilized at a relatively low state, the first three-way valve 61 is controlled to switch to the GA end and the GB end, so that the first heat exchanger 2 is connected to the outdoor heat exchanger 52 and the indoor heat exchanger 51 respectively. The second three-way valve 62 is switched to the EC end to connect the indoor heat exchanger 51 and the first four-way valve 31. Therefore, after the refrigerant throttled by the first throttling device 71 passes through the first three-way valve 61, a part of it enters the second throttling device 72 for secondary throttling, cooling and reducing pressure, and then the refrigerant enters the indoor heat exchanger 51, and the indoor hanging machine dehumidifies the room to improve the indoor comfort. The other part of the refrigerant enters the outdoor heat exchanger 52 for heat exchange and returns to the compressor return port through the first four-way valve 31.

[0070] Reference Figure 4 , when the user needs indoor cooling in summer, the air conditioner runs in cooling mode. Control the first four-way valve 31 and the switching valve to switch to connect the compressor outlet with the outdoor heat exchanger 52, and the indoor heat exchanger 51 with the compressor return port. Control the first three-way valve 61 to switch to the AB end to connect the outdoor heat exchanger 52 with the indoor heat exchanger 51. The second three-way valve 62 is switched to the ED end to connect the indoor heat exchanger 51 with the switching valve. The refrigerant at the outlet of the compressor 1 enters the first four-way valve 31, and then enters the outdoor heat exchanger 52. After heat exchange with the outdoor environment, it enters the first three-way valve 61. The refrigerant passes through the second throttling device 72 to throttle, cool down and reduce pressure, and then enters the indoor heat exchanger 51. The indoor heat exchanger 51 absorbs heat and evaporates, condenses the air, and dehumidifies the room. Then the refrigerant enters the switching valve through the second three-way valve 62, and then returns to the first four-way valve 31 and returns to the compressor 1.

[0071] The air conditioning system of the present invention can not only achieve heat dehumidification through floor heating and indoor heat exchanger 51 during heating, but also achieve cooling at the same time. It has a simple structure and low cost, which greatly improves the user experience.

[0072] Reference Figure 1In a possible embodiment, the air conditioning system of the present invention includes a compressor 1, a second heat exchanger 4, a first four-way valve 31, a second four-way valve 32, a first heat exchanger 2, an indoor heat exchanger 51 and an outdoor heat exchanger 52 connected in sequence through a refrigerant circulation loop. The second heat exchanger 4 is located between the compressor outlet and the first four-way valve 31. A first three-way valve 61, a second three-way valve 62, a first throttling device 71 and a second throttling device 72 are also provided on the refrigerant circulation loop, and the second three-way valve 62 and the second four-way valve 32 are connected through a second pipeline. The first three-way valve 61 is respectively connected to the first heat exchanger 2, the indoor heat exchanger 51 and the outdoor heat exchanger 52, and the first throttling device 71 is arranged between the first heat exchanger 2 and the first three-way valve 61. The second three-way valve 62 is respectively connected to the first four-way valve 61, the indoor heat exchanger 51 and the second four-way valve 32, and the second throttling device 72 is arranged between the indoor heat exchanger 51 and the first three-way valve 61. The second heat exchanger 4 exchanges heat with the hot water pipeline, and the first heat exchanger 2 exchanges heat with the floor heating pipeline, so that both domestic hot water and air conditioning refrigeration can be achieved during thermal dehumidification.

[0073] Continue to refer to Figure 1 Furthermore, a gas-liquid separator 11, a liquid storage tank 8 and a filter 9 are also provided on the refrigerant circulation loop. The gas-liquid separator 11 is provided on the refrigerant circulation loop and is located at the return air port of the compressor. The filter 9 is provided on the refrigerant circulation loop and is located between the first heat exchanger 2 and the first three-way valve 61. The liquid storage tank 8 is provided between the filter 9 and the first heat exchanger 2.

[0074] When indoor heating is needed in winter, the air conditioning system operates in heating mode, and switches the first four-way valve 31 and the second four-way valve 32 to connect the second heat exchanger 4 and the first heat exchanger 2, and connect the outdoor heat exchanger 52 and the compressor return air port.

[0075] Specifically, the high-temperature and high-pressure refrigerant at the compressor outlet enters the second heat exchanger 4 to heat domestic water. The refrigerant then passes through the first four-way valve 31 and enters the second four-way valve 32, and then enters the first heat exchanger 2 to heat the floor heating pipeline. The refrigerant then passes through the liquid storage tank 8 and the filter 9. The liquid storage tank 8 can release or absorb the refrigerant, play a buffering role, ensure the stability of the refrigerant supply in the system, maintain the relative stability of the system pressure, and thus ensure that the air-conditioning system can operate continuously and stably. The filter 9 filters the impurities in the refrigerant. Next, the refrigerant enters the first throttling device 71 for throttling.

[0076] Reference Figure 1Furthermore, when the indoor dehumidification is not turned on, the first three-way valve 61 is switched to the GA end to connect the first heat exchanger 2 and the outdoor heat exchanger 52. The refrigerant throttled by the first throttling device 71 enters the outdoor heat exchanger 52 through the first three-way valve 61 for heat exchange, and then returns to the compressor return port through the first four-way valve 31.

[0077] Reference Figure 2 When the dehumidification is turned on indoors with high humidity, the first three-way valve 61 is controlled to switch to the GB end to connect the first heat exchanger 2 and the indoor heat exchanger 51. The second three-way valve 62 is switched to the EC end to connect the indoor heat exchanger 51 and the first four-way valve 31. Therefore, the refrigerant throttled by the first throttling device 71 passes through the first three-way valve 61 and enters the second throttling device 72 for secondary throttling, cooling and reducing pressure. Then the refrigerant enters the indoor heat exchanger 51, and the indoor hanging machine dehumidifies the room to improve the indoor comfort.

[0078] Reference Figure 3 After the indoor humidity has stabilized at a relatively low state, the first three-way valve 61 is controlled to switch to the GA end and the GB end, so that the first heat exchanger 2 is connected to the outdoor heat exchanger 52 and the indoor heat exchanger 51 respectively. The second three-way valve 62 is switched to the EC end to connect the indoor heat exchanger 51 and the first four-way valve 31. Therefore, after the refrigerant throttled by the first throttling device 71 passes through the first three-way valve 61, a part of it enters the second throttling device 72 for secondary throttling, cooling and reducing pressure, and then the refrigerant enters the indoor heat exchanger 51, and the indoor hanging machine dehumidifies the room to improve the indoor comfort. The other part of the refrigerant enters the outdoor heat exchanger 52 for heat exchange and returns to the compressor return port through the first four-way valve 31. Maintain the use of floor heating and domestic hot water.

[0079] Reference Figure 4 When the user needs indoor cooling in summer, the air conditioner runs in cooling mode, controls the first four-way valve 31 and the second four-way valve 32 to switch to connect the second heat exchanger 4 with the outdoor heat exchanger 52, and the indoor heat exchanger 51 with the compressor return air port. Control the first three-way valve 61 to switch to the AB end to connect the outdoor heat exchanger 52 with the indoor heat exchanger 51. The second three-way valve 62 is switched to the ED end to connect the indoor heat exchanger 51 and the second four-way valve 32. The refrigerant at the outlet of the compressor 1 enters the second heat exchanger 4 to heat the domestic hot water, and then the refrigerant enters the outdoor heat exchanger 52 through the first four-way valve 31, and enters the first three-way valve 61 after heat exchange with the outdoor environment. After the refrigerant is throttled and cooled and reduced in pressure by the second throttling device 72, it enters the indoor heat exchanger 51, and the indoor heat exchanger 51 absorbs heat and evaporates to dehumidify the room. Then the refrigerant enters the second four-way valve 32 through the second three-way valve 62 , returns to the first four-way valve 31 , enters the gas-liquid separator 11 for gas-liquid separation, and finally returns to the compressor 1 .

[0080] Among them, the middle way of the second four-way valve 32 is in a normally closed state and can be sealed by manual welding. When cooling in summer, the coil of the first four-way valve 31 is energized, and the coil of the second four-way valve 32 is not energized. When heating in winter, the coil of the first four-way valve 31 is not energized, and the coil of the second four-way valve 32 is energized. It should be noted that the switching valve arranged between the first heat exchanger 2 and the first four-way valve 31 can be other types of valve bodies besides the second four-way valve 32, such as an electric three-way valve, etc. Those skilled in the art can set it according to their needs, and all fall within the protection scope of the present invention.

[0081] As stated in the first paragraph of this section, the above implementation mode is only used to illustrate the principles of the present invention and is not intended to limit the scope of protection of the present invention. Without departing from the principles of the present invention, those skilled in the art can adjust the above structure so that the present invention can be applied to more specific application scenarios.

[0082] In addition, the present invention also provides a control method for an air-conditioning system, where the air-conditioning system is the air-conditioning system described in any of the above embodiments.

[0083] Reference Figures 1 to 3 as well as Figure 5 , the specific steps of the control method include:

[0084] Step S11: receiving an indoor heating instruction;

[0085] Step S12: Control the first four-way valve and the second four-way valve to switch the second heat exchanger to communicate with the first heat exchanger, and the outdoor heat exchanger to communicate with the compressor return port;

[0086] Step S13: Control the first three-way valve to switch to connect the compressor return port with the outdoor heat exchanger;

[0087] Step S14: receiving an instruction to run a dehumidification function;

[0088] Step S15: Obtain indoor humidity value;

[0089] Step S16: when the indoor humidity value is greater than or equal to the first preset humidity value, the first three-way valve is controlled to switch to connect the first heat exchanger with the indoor heat exchanger; the second three-way valve is controlled to switch to connect the indoor heat exchanger with the first four-way valve;

[0090] Step S17: When the first preset humidity value>the indoor humidity value>the second preset humidity value, the first three-way valve is controlled to switch to connect the first heat exchanger to the indoor heat exchanger and the outdoor heat exchanger respectively.

[0091] When the air conditioning system is heating, the dehumidification function is operated, and the indoor humidity value is detected at the same time. When the indoor humidity value is higher than the first preset humidity value, it means that the indoor humidity is high and dehumidification is required. Therefore, the corresponding valve body is controlled to switch to achieve hot dehumidification. When the indoor humidity gradually decreases to between the first preset humidity and the second preset humidity, it means that the indoor humidity is stable at a relatively low state. While maintaining a certain dehumidification amount indoors, the refrigerant also exchanges heat through the outdoor heat exchanger 52 to maintain the use experience of floor heating and domestic hot water. Of course, those skilled in the art can also cancel the second heat exchanger 4, but directly connect the first heat exchanger 2 and the compressor outlet during heating. Those skilled in the art can set it according to actual needs.

[0092] Step S18: When the indoor humidity value is ≤ the second preset humidity value, the first three-way valve is controlled to switch to connect the first heat exchanger with the outdoor heat exchanger.

[0093] When the indoor humidity further decreases to a certain level, it means that the indoor humidity is low, and the valve body is switched to only exchange heat through the outdoor unit. While providing heating for the floor heating, the indoor humidity will no longer be dehumidified.

[0094] Reference Figure 6 , the control method further comprises the following steps:

[0095] Step S21: receiving an indoor cooling instruction;

[0096] Step S22: Control the first four-way valve and the second four-way valve to switch the second heat exchanger to communicate with the outdoor heat exchanger, and the indoor heat exchanger to communicate with the compressor return port;

[0097] Step S23: Control the first three-way valve to switch to connect the first heat exchanger with the indoor heat exchanger; and control the second three-way valve to switch to connect the indoor heat exchanger with the second four-way valve.

[0098] Those skilled in the art can understand that the above-mentioned air conditioning system also includes some other well-known structures, the controller, the memory includes but is not limited to random access memory, flash memory, read-only memory, programmable read-only memory, volatile memory, non-volatile memory, serial memory, parallel memory or register, etc., and the processor includes but is not limited to CPLD / FPGA, DSP, ARM processor, MIPS processor, etc. In order to unnecessarily obscure the embodiments of the present disclosure, these well-known structures are not shown in the drawings.

[0099] Although the various steps in the above embodiment are described in the above order, those skilled in the art can understand that in order to achieve the effect of the present embodiment, different steps do not have to be executed in such an order, and they can be executed simultaneously (in parallel) or in a reverse order. For example, those skilled in the art can set the order of the steps as needed, and all of them fall within the protection scope of the present invention.

[0100] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. An air conditioning system, characterized in that: The air conditioning system comprises a compressor, a first four-way valve, a switching valve, a first heat exchanger, an indoor heat exchanger and an outdoor heat exchanger which are sequentially connected through a refrigerant circulation loop; wherein the first heat exchanger exchanges heat with the floor heating pipeline; A first three-way valve, a second three-way valve, a first throttling device and a second throttling device are also provided on the refrigerant circulation circuit, and the second three-way valve and the switching valve are connected via a second pipeline; The first three-way valve is connected to the first heat exchanger, the indoor heat exchanger and the outdoor heat exchanger respectively; the first throttling device is arranged between the first heat exchanger and the first three-way valve; The second three-way valve is respectively connected to the first four-way valve, the indoor heat exchanger and the switching valve; the second throttling device is arranged between the indoor heat exchanger and the first three-way valve.

2. The air conditioning system according to claim 1, characterized in that: The air conditioning system also includes a second heat exchanger, which is arranged on the refrigerant circulation loop and located between the compressor outlet and the first four-way valve; wherein the second heat exchanger exchanges heat with the hot water pipeline.

3. The air conditioning system according to claim 1, characterized in that: The air conditioning system further includes a filter, which is disposed on the refrigerant circulation loop and located between the first heat exchanger and the first three-way valve.

4. The air conditioning system according to claim 3, characterized in that: The air conditioning system further includes a liquid storage tank, which is disposed on the refrigerant circulation loop and located between the filter and the first heat exchanger.

5. The air conditioning system according to claim 1, characterized in that: The air conditioning system further comprises a gas-liquid separator, which is arranged on the refrigerant circulation loop and located at the air return port of the compressor.

6. A control method for an air conditioning system, characterized in that: The air conditioning system comprises a compressor, a first four-way valve, a switching valve, a first heat exchanger, an indoor heat exchanger and an outdoor heat exchanger which are sequentially connected through a refrigerant circulation loop; wherein the first heat exchanger exchanges heat with the floor heating pipeline; A first three-way valve, a second three-way valve, a first throttling device and a second throttling device are also provided on the refrigerant circulation circuit, and the second three-way valve and the switching valve are connected via a second pipeline; The first three-way valve is connected to the first heat exchanger, the indoor heat exchanger and the outdoor heat exchanger respectively; the first throttling device is arranged between the first heat exchanger and the first three-way valve; The second three-way valve is respectively connected to the first four-way valve, the indoor heat exchanger and the switching valve; the second throttling device is arranged between the indoor heat exchanger and the first three-way valve; The control method comprises: Receive indoor heating command; Controlling the first four-way valve and the switching valve to switch the compressor outlet to communicate with the first heat exchanger, and the outdoor heat exchanger to communicate with the compressor return port; The first three-way valve is controlled to switch to connect the first heat exchanger and the outdoor heat exchanger.

7. The control method of the air conditioning system according to claim 6, characterized in that: The control method further comprises: Receiving an instruction for indoor cooling; Controlling the first four-way valve and the switching valve to switch the compressor air outlet to communicate with the outdoor heat exchanger, and the indoor heat exchanger to communicate with the compressor air return port; The first three-way valve is controlled to switch to connect the first heat exchanger with the indoor heat exchanger; the second three-way valve is controlled to switch to connect the indoor heat exchanger with the switching valve.

8. The control method of the air conditioning system according to claim 6, characterized in that: The control method further comprises: The air conditioner receives a command to operate the dehumidification function when heating; Get the indoor humidity value; When the indoor humidity value is greater than or equal to a first preset humidity value, controlling the first three-way valve to switch to connect the first heat exchanger with the indoor heat exchanger; The second three-way valve is controlled to switch to connect the indoor heat exchanger and the first four-way valve.

9. The control method of the air conditioning system according to claim 8, characterized in that: The control method further comprises: When the first preset humidity value>the indoor humidity value>the second preset humidity value, the first three-way valve is controlled to switch to connect the first heat exchanger with the indoor heat exchanger and the outdoor heat exchanger respectively.

10. The control method of the air conditioning system according to claim 8, characterized in that: When the indoor humidity value is less than or equal to a second preset humidity value, the first three-way valve is controlled to switch to connect the first heat exchanger with the outdoor heat exchanger.

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