Air conditioning system

Abstract

The application discloses an air conditioning system. The air conditioning system comprises an outdoor unit, an indoor unit and a floor heating unit. The outdoor unit comprises a compressor and an outdoor heat exchanger. The indoor unit comprises an indoor heat exchanger and an indoor throttling device. The floor heating unit comprises a floor heating coil and a coil throttling device. The air conditioning system has an indoor circuit, a first floor heating circuit and a second floor heating circuit. The second floor heating circuit and the first floor heating circuit can be switched for use. The air conditioning system can cool the indoor environment and supply floor heating at the same time.

Description

Technical Field

[0001] This invention relates to the field of air conditioning system technology, and in particular to an air conditioning system. Background Technology

[0002] Currently, air conditioning and underfloor heating systems on the market are generally separate systems. The comfort levels provided by these two systems differ depending on the season. For example, users tend to use air conditioning in the summer and underfloor heating in the cold winter. However, there are currently no products on the market that combine both systems, as installing both simultaneously would be costly, space-consuming, and inconvenient to operate. Summary of the Invention

[0003] The main objective of this invention is to propose an air conditioning system that can provide underfloor heating while maintaining cooling.

[0004] To achieve the above objectives, the present invention proposes an air conditioning system, which includes an outdoor unit, an indoor unit, and a floor heating unit. The outdoor unit includes a compressor and an outdoor heat exchanger, the indoor unit includes an indoor heat exchanger and an indoor throttling device, and the floor heating unit includes floor heating coils and a coil throttling device.

[0005] The air conditioning system also includes an exhaust pipe connected to the exhaust side of the compressor, a return pipe connected to the return side of the compressor, a first piping that connects the exhaust pipe, the indoor throttling device, and the indoor heat exchanger in sequence, and a second piping that connects the indoor heat exchanger and the return pipe, thereby forming an indoor circuit;

[0006] The air conditioning system also includes a first branch pipe branching off from the first intersection of the first piping and a second branch pipe branching off from the second piping. The first branch pipe is connected in sequence to the coil throttling device, the underfloor heating coil, and the second branch pipe, thereby forming a first underfloor heating circuit. The first intersection is located between the outdoor heat exchanger and the coil throttling device.

[0007] The air conditioning system also includes a high-pressure piping, one end of which is connected to the exhaust pipe and the other end of which is connected to the underfloor heating coil to form a second underfloor heating circuit. The second underfloor heating circuit and the first underfloor heating circuit can be switched between each other.

[0008] Optionally, the air conditioning system further includes a first control valve located in the high-pressure piping.

[0009] Optionally, the air conditioning system further includes a second control valve, which is located on the second branch pipe.

[0010] Optionally, the air conditioning system further includes a first switcher, which is capable of switching between a first state and a second state, wherein:

[0011] In the first state, the first switch connects the exhaust pipe to the first piping;

[0012] In the second state, the first switch connects the return gas pipe to the first piping.

[0013] Optionally, the air conditioning system further includes a second switcher, which can switch between a third state and a fourth state, wherein:

[0014] In the third state, the second switch connects the exhaust pipe to the second piping;

[0015] In the fourth state, the second switch connects the return gas pipe to the second piping.

[0016] Optionally, the first switch and / or the second switch is a three-way valve or a four-way valve.

[0017] Optionally, the air conditioning system further includes a first switching valve, which is disposed on the first piping and located between the first intersection and the outdoor heat exchanger.

[0018] Optionally, the air conditioning system further includes a second switching valve, which is located on the second piping.

[0019] Optionally, the air conditioning system further includes a third switching valve, which is located on the high-pressure piping.

[0020] Optionally, the air conditioning system further includes a third branch pipe branching off from the second piping, the third branch pipe connecting the second piping and the indoor heat exchanger, and the third branch pipe being provided with a third control valve.

[0021] Optionally, the air conditioner further includes an economizer, which is disposed on a first piping between the outdoor heat exchanger and the first intersection point, and the return pipe of the economizer is connected to the return gas side of the compressor.

[0022] The technical solution of this invention features an air conditioning system where the indoor unit and the underfloor heating unit share a single outdoor unit. This design is compact, occupies little space, and is easy to install. The indoor and outdoor units can work together to achieve independent cooling or heating. Since the air conditioning system also has a first and a second underfloor heating circuit, switching between the first and second circuits allows the underfloor heating unit to work with the outdoor and / or indoor units to form various heating and cooling circuits. This enables switching between different modes, such as air conditioning cooling or heating, and underfloor heating, greatly satisfying user needs. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of an embodiment of the air conditioning system of the present invention;

[0025] Figure 2 for Figure 1 Schematic diagram of the combined cooling and underfloor heating mode of a central air conditioning system;

[0026] Figure 3 for Figure 1 Schematic diagram of the combined heating and underfloor heating mode of a central air conditioning system;

[0027] Figure 4 for Figure 1 Schematic diagram of the underfloor heating mode of a central air conditioning system;

[0028] Figure 5 for Figure 1 Schematic diagram of a single cooling mode air conditioning system in China;

[0029] Figure 6 for Figure 1 Schematic diagram of a single heating mode air conditioning system.

[0030] Explanation of icon numbers:

[0031]

[0032]

[0033] The objectives, features, and advantages of this invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0035] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0036] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0037] This invention provides an air conditioning system that integrates a floor heating system, thereby enabling it to operate in multiple modes, including cooling, heating, constant temperature dehumidification, and floor heating.

[0038] Please see Figure 1 In one embodiment of the air conditioning system of the present invention, the air conditioning system includes an outdoor unit 100, an indoor unit 200, and a floor heating unit 300. The outdoor unit 100 includes a compressor 110 and an outdoor heat exchanger 120. The indoor unit 200 includes an indoor heat exchanger 210 and an indoor throttling device 220. The floor heating unit 300 includes floor heating coils 310 and coil throttling devices 320.

[0039] It should be noted that, for the aforementioned air conditioning system, the outdoor unit 100 exchanges heat with the outdoor environment, and is not specifically located outdoors; similarly, the indoor unit 200 mentioned later exchanges heat with the indoor environment, and is not specifically located indoors. For example, when the air conditioning system is a window air conditioner, the outdoor unit 100 and the indoor unit 200 are housed in the same casing, and the outdoor unit 100 exchanges heat with the outdoor environment. When the air conditioning system is a split-type air conditioner, the outdoor unit 100 and the indoor unit 200 are housed in different casings, with the unit containing the outdoor unit 100 located outdoors, and the unit containing the indoor unit 200 located indoors.

[0040] The air conditioning system also includes an exhaust pipe 111 connected to the exhaust side of the compressor 110, a return pipe 112 connected to the return side of the compressor 110, a first piping 400 connected in sequence to the exhaust pipe 111, the indoor throttling device 220, and the indoor heat exchanger 210, and a second piping 500 connecting the indoor heat exchanger 210 and the return pipe 112, thereby forming an indoor circuit;

[0041] The air conditioning system also includes a first branch pipe 101 branching out from the first intersection point 410 of the first piping 400 and a second branch pipe 102 branching out from the second piping 500. The first branch pipe 101 is connected in sequence to the coil throttling device 320, the underfloor heating coil 310 and the second branch pipe 102, thereby forming a first underfloor heating circuit. The first intersection point 410 is located between the outdoor heat exchanger 120 and the coil throttling device 320.

[0042] The air conditioning system also includes a high-pressure piping 600, one end of which is connected to an exhaust pipe 111, and the other end of which is connected to a floor heating coil 310, forming a second floor heating circuit. The second floor heating circuit and the first floor heating circuit can be switched between each other. When the air conditioning system activates the floor heating unit, refrigerant flows through the floor heating coil. During this process, the floor heating coil supplies heat to the room through radiation and convection heat transfer, thus achieving floor heating. This type of floor heating is more comfortable and quieter, offering superior comfort.

[0043] There are several ways to switch between the two circuits, such as, but not limited to: installing control valves on the second branch pipe 102 and the high-pressure piping 600 respectively, and using these control valves to switch between the first and second underfloor heating circuits. Alternatively, connecting the second branch pipe 102 and the high-pressure piping 600 to the underfloor heating coil 310 via a three-way valve to achieve the switching between the first and second underfloor heating circuits. The first switching method mentioned above is used here, and will be described in detail later.

[0044] There are various implementation forms for the above-mentioned throttling devices, such as throttling valves, capillary tubes, and electronic expansion valves. For example, but not limited to, indoor throttling device 220 or coil throttling device 320 can both include throttling valves.

[0045] The technical solution of this invention features an air conditioning system where the indoor unit 200 and the underfloor heating unit 300 share a single outdoor unit 100, resulting in a compact structure, small footprint, and easy installation. The indoor unit 200 and the outdoor unit 100 can work together to achieve independent cooling or heating. Since the air conditioning system also has a first underfloor heating circuit and a second underfloor heating circuit, the underfloor heating unit 300 can work with the outdoor unit 100 and / or the indoor unit 200 through either the first or second underfloor heating circuit to form multiple heating and cooling circuits. This allows for switching between different modes, such as air conditioning cooling or heating, and underfloor heating cooling water or underfloor heating, greatly satisfying user needs.

[0046] Please see Figure 1 Based on the above embodiments, the air conditioning system further includes a first switch 150, which can switch between a first state and a second state. Specifically: in the first state, the first switch 150 connects the exhaust pipe 111 to the first piping 400; in the second state, the first switch 150 connects the return pipe 112 to the first piping 400.

[0047] Through the setting of the first switch 150, in the first state, the air conditioning system is in a cooling state, such as the indoor heat exchanger 210 cooling and / or the underfloor heating coil 310 cooling; in the second state, the air conditioning system is in a heating state, such as the indoor heat exchanger 210 heating and / or the underfloor heating coil 310 heating. More details will be provided later.

[0048] Furthermore, the air conditioning system also includes a second switch 160, which can switch between a third state and a fourth state. In the third state, the second switch 160 connects the exhaust pipe 111 to the second piping 500; in the fourth state, the second switch 160 connects the return pipe 112 to the second piping 500.

[0049] By coordinating the second switch 160 with the first switch 150, the air conditioning system can be configured in a third state where it is in cooling mode (e.g., the indoor heat exchanger 210 is cooling or the underfloor heating coil 310 is cooling); and in a fourth state where it is in heating mode (e.g., the indoor heat exchanger 210 is cooling and / or the underfloor heating coil 310 is heating). This allows for a wider range of functions than a conventional four-way valve can achieve. For example, during cooling, the first switch 150 switches to the first state while simultaneously switching the second switch 160 to the third state; during heating, the first switch 150 switches to the second state while simultaneously switching the second switch 160 to the fourth state. Further details will be provided later.

[0050] It should be noted that the first switch 150 and / or the second switch 160 are three-way valves or four-way valves. The first switch 150 and the second switch 160 can coexist, or one of them can be used and combined with other connecting valve structures (such as two-way valves) to enable the air conditioner to switch between four modes: constant temperature dehumidification, single heating, single cooling, and floor heating.

[0051] In this embodiment, both the first switch 150 and the second switch 160 are four-way valves, with one end of the four-way valve configured as a normally closed end. Wherein:

[0052] The first switch 150 has a D1 terminal, a C1 terminal, an E1 terminal, and an S1 terminal, with the E1 terminal configured as a normally closed terminal. The D1 terminal is connected to the exhaust pipe 111 of the compressor 110, the C1 terminal is connected to the outdoor heat exchanger 120, and the S1 terminal is connected to the return pipe 112 of the compressor 110. In a first state, the D1 terminal and the C1 terminal of the first switch 150 are connected; in a second state, the C1 terminal and the S1 terminal are connected.

[0053] The second switch 160 has a D2 terminal, a C2 terminal, an E2 terminal, and an S2 terminal, with the C2 terminal configured as a normally closed terminal. The D2 terminal is connected to the exhaust pipe 111 of the compressor 110, the E2 terminal is connected to the second piping 500, and the S2 terminal is connected to the return pipe 112 of the compressor 110. In the third state, the E2 terminal and the S2 terminal of the second switch 160 are connected; in the fourth state, the D2 terminal and the S2 terminal are connected.

[0054] Please see Figure 1In one embodiment, to better control the on / off state of the air conditioning system's piping, the air conditioning system further includes a first switching valve k1 disposed on the first piping 400, located between the outdoor heat exchanger 120 and the indoor throttling device 220. The first switching valve k1 controls the on / off state of the first piping 400. The air conditioning system also includes a second switching valve k2 disposed on the second piping 500, located between the indoor heat exchanger 210 and the return pipe 112. The second switching valve k2 controls the on / off state of the second piping 500. The first switching valve k1, the second switching valve k2, and the aforementioned high-pressure valve can all be shut-off valves or control valves.

[0055] In another embodiment, to enable the air conditioner to switch between different modes, the air conditioning system further includes a first control valve 330, which is located on the high-pressure piping 600. The first control valve 330 can control the on / off state of the high-pressure piping 600 and / or regulate the flow rate and velocity of the refrigerant passing through the high-pressure piping 600. The first control valve 330 can be a solenoid valve. The air conditioning system also includes a second control valve 340, which is located on the second branch pipe 102. The second control valve 340 can control the on / off state of the second branch pipe 102 and / or regulate the flow rate and velocity of the refrigerant passing through the second branch pipe 102. The second control valve 340 can be a solenoid valve.

[0056] Optionally, both the first control valve 330 and the second control valve 340 are solenoid valves. By controlling the opening and closing of the first control valve 330 and the second control valve 340, the automatic switching between the first underfloor heating circuit and the second underfloor heating circuit can be realized, thereby achieving different working modes.

[0057] The following is a detailed explanation of the various modes of the air conditioning system:

[0058] Please see Figure 2 Air conditioning system cooling and underfloor heating combination modes:

[0059] In this combined cooling and underfloor heating mode, the first switch 150 switches to the first state, the second switch 160 switches to the third state, the first control valve 330 opens, and the second control valve 340 closes. The compressor 110 discharges high-temperature, high-pressure refrigerant from the exhaust pipe 111, then enters from the D1 end of the first switch 150 and exits from its C1 end, and then splits into two parts: the first part of the refrigerant enters the outdoor heat exchanger 120 through the first piping 400 to liquefy, and the liquefied refrigerant flows from the first switch valve k1 to the first intersection point 410 of the first piping 400; the second part of the refrigerant enters the underfloor heating coil 310 through the high-pressure piping 600 and the first control valve 330, where it liquefies and releases heat to supply underfloor heating to the indoor environment (i.e., using the second underfloor heating circuit for heating), and after liquefaction, it flows from the first branch pipe 101 to the first intersection point 410 of the first piping 400, where it merges with the aforementioned first part of the refrigerant.

[0060] The combined refrigerant enters the indoor heat exchanger 210 via the indoor throttling device 220, where it undergoes evaporative cooling to achieve indoor environmental cooling. The gaseous refrigerant discharged from the indoor heat exchanger 210 after evaporation passes sequentially through the second piping 500 and the second switching valve k2, then enters from the E2 end of the second switch 160 and exits from its S2 end. Finally, it flows back to the compressor 110 via the gas-liquid separator 140 and the return pipe 112 for recirculation, thus simultaneously cooling the indoor environment and activating underfloor heating. Given that in this mode, the underfloor heating unit provides heating while the indoor units provide cooling, the underfloor heating unit can be placed in the room requiring heating, and the indoor units can be placed in the room requiring cooling.

[0061] Please see Figure 3 Combination mode of air conditioning system heating and underfloor heating:

[0062] In this combined heating and underfloor heating mode, the first switch 150 switches to the second state, the second switch 160 switches to the fourth state, the first control valve 330 closes, and the second control valve 340 opens. The compressor 110 discharges high-temperature, high-pressure refrigerant from the exhaust pipe 111, then enters from the D2 end of the second switch 160 and exits from its E2 end. It then flows along the second piping 500 to the second switching valve k2. After reaching the second intersection point 510 of the second piping 500, the refrigerant is divided into two parts: the first part of the refrigerant enters the indoor heat exchanger 210 for liquefaction and heat release, thereby achieving heat exchange and heating of the room. After liquefaction, it flows through the indoor throttling device 220 to the first intersection point 410 of the first piping 400. The second part of the refrigerant flows through the second branch pipe 102 and the second control valve 340 into the underfloor heating coil 310 for liquefaction and heat release to supply underfloor heating to the indoor environment (i.e., using the first underfloor heating circuit for heating). After liquefaction, it flows from the first branch pipe 101 to the first intersection point 410 of the first piping 400, where it merges with the aforementioned first part of the refrigerant.

[0063] The combined refrigerant flows through the first piping 400 and the first switching valve k1 to the outdoor heat exchanger 120. After vaporizing in the outdoor heat exchanger 120, it flows to the first switcher 150, then enters from the C1 end of the first switcher 150 and exits from its S1 end. Finally, it flows back to the compressor 110 through the gas-liquid separator 140 and the return pipe 112 for recirculation, thus achieving simultaneous heating of the indoor environment and supply of underfloor heating. Since both the underfloor heating unit and the indoor unit provide heating, they can be located in the same or different indoor environments (rooms).

[0064] In addition to the above modes, the air conditioning system can achieve independent cooling (e.g., by completely shutting down the underfloor heating unit 300, such as by closing the first and second control valves) when the underfloor heating unit 300 is completely shut down. Figure 5 (as shown) or separate heating (such as) Figure 6 The air conditioning functions shown are not described in detail here.

[0065] In one embodiment, considering that the power consumption is high and energy consumption is large when the underfloor heating unit 300 is turned on, the load on the power supply system is also large. Therefore, to reduce the energy consumption pressure on the air conditioning system, the operation of other heat exchangers can be minimized (e.g., the indoor heat exchanger 210 can be turned off). For example, the flow rate can be adjusted to zero using the indoor throttling device 220. However, it is unavoidable that a small amount of refrigerant will enter the indoor heat exchanger 210 from the indoor throttling device 220, resulting in a reduction in the refrigerant in the underfloor heating circuit and reducing the efficiency of the underfloor heating supply.

[0066] Therefore, to solve the above problems, the air conditioning system also includes a third branch pipe 103 branching off from the second pipe 500. The third branch pipe 103 connects the second pipe 500 and the indoor heat exchanger 210, and the third branch pipe 103 is equipped with a third control valve 230. The third control valve 230 can control the on / off state of the third branch pipe 103, thereby enabling independent underfloor heating without activating the indoor unit.

[0067] Please see Figure 4 Underfloor heating mode of the air conditioning system:

[0068] In this underfloor heating mode, the first switch 150 switches to the second state, the second switch 160 switches to the third state, the first control valve 330 opens, the second control valve 340 closes, and the indoor unit 200 is shut down (e.g., by closing via the third control valve 230). The compressor 110 discharges high-temperature and high-pressure refrigerant from the exhaust pipe 111, which then enters the underfloor heating coil 310 through the high-pressure piping 600 and the first control valve 330. The refrigerant is liquefied and releases heat to heat the indoor environment (i.e., the second underfloor heating circuit is used for heating). After liquefaction, the refrigerant flows from the first branch pipe 101 to the first intersection point 410 of the first piping 400. Since the indoor unit 200 is closed, the refrigerant enters the outdoor heat exchanger 120 through the first piping 400 and evaporates there. The evaporated refrigerant flows to the first switch 150, then enters from the C1 end of the first switch 150 and exits from its S1 end. Finally, it flows back to the compressor 110 through the gas-liquid separator 140 and the return pipe 112 for recirculation, thereby achieving independent supply of underfloor heating.

[0069] It is worth mentioning that, in the above-mentioned underfloor heating mode, when the indoor unit 200 is closed, the indoor throttling device 220 can also be closed or adjusted to the minimum while the third control valve 230 is closed. This can reduce the leakage of refrigerant from the first piping 400 to the indoor heat exchanger 210, ensure that the underfloor heating circuit has sufficient refrigerant, and thus improve the efficiency of supplying underfloor heating.

[0070] Based on any of the above embodiments, the heat exchanger included in the indoor unit 200 of the air conditioning system can be of different types. For example, it can be a common cooling / heating indoor unit (with only one heat exchanger and a corresponding throttling device), or include an indoor unit with constant temperature dehumidification function (with both a dehumidification heat exchanger and a reheat heat exchanger), or an indoor unit with a switching device that can freely switch between cooling and heating states, one or more of these, so that the air conditioner can simultaneously perform mixed operation such as constant temperature dehumidification, cooling, and heating.

[0071] Please see Figure 1 Based on any of the above embodiments, to avoid unpleasant noise generated when the two-phase refrigerant passes through the indoor throttling device 220, the air conditioner further includes an economizer 130. The economizer 130 is installed on the first piping 400 between the outdoor heat exchanger 120 and the first intersection point 410. The return pipe 141 of the economizer 130 is connected to the gas-liquid separator 140. The return pipe 141 can take various forms. It may consist only of the return pipe body, or it may consist of the return pipe body and a first connecting pipe. One end of the first connecting pipe is connected to the return pipe body, and the other end of the first connecting pipe is connected to the gas-liquid separator 140.

[0072] This invention employs a system design with an economizer 130 based on a three-pipe dehumidification and reheat scheme. By controlling the liquid throttling valve (electronic expansion valve) in the system design loop with the economizer 130, the refrigerant condensation temperature at the outlet of the outdoor heat exchanger 120 is further reduced, and the subcooling is increased, so that the refrigerant is completely condensed into a liquid state. The liquid refrigerant enters the indoor heat exchanger 210 for heat absorption and evaporation after being throttled and depressurized by the indoor electronic expansion valve. When the refrigerant after passing through the indoor throttling device 220 is in a completely liquid state, the abnormal noise of the refrigerant generated by the gas-liquid two-phase state can be solved.

[0073] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. An air conditioning system, characterized in that, The air conditioning system includes an outdoor unit, an indoor unit, and a floor heating unit. The outdoor unit includes a compressor and an outdoor heat exchanger. The indoor unit includes an indoor heat exchanger and an indoor throttling device. The floor heating unit includes floor heating coils and coil throttling devices. The air conditioning system also includes an exhaust pipe connected to the exhaust side of the compressor, a return pipe connected to the return side of the compressor, a first piping that connects the exhaust pipe, the indoor throttling device, and the indoor heat exchanger in sequence, and a second piping that connects the indoor heat exchanger and the return pipe, thereby forming an indoor circuit. The air conditioning system also includes a first branch pipe branching off from the first intersection of the first piping and a second branch pipe branching off from the second piping. The first branch pipe is connected in sequence to the coil throttling device, the underfloor heating coil, and the second branch pipe, thereby forming a first underfloor heating circuit. The first intersection is located between the outdoor heat exchanger and the coil throttling device. The air conditioning system also includes high-pressure piping, one end of which is connected to the exhaust pipe and the other end of which is connected to the underfloor heating coil to form a second underfloor heating circuit. The second underfloor heating circuit and the first underfloor heating circuit can be switched. The air conditioning system further includes a first switcher, which can switch between a first state and a second state, wherein: In the first state, the first switch connects the exhaust pipe to the first piping; In the second state, the first switch connects the return gas pipe to the first piping; The air conditioning system further includes a second switcher, which can switch between a third state and a fourth state, wherein: In the third state, the second switch connects the exhaust pipe to the second piping; In the fourth state, the second switch connects the return gas pipe to the second piping; The air conditioning system has a cooling and floor heating combination mode and a heating and floor heating combination mode. In the cooling and floor heating combination mode, the first switch is in a first state and the second switch is in a third state. In the heating and floor heating combination mode, the first switch is in a second state and the second switch is in a fourth state. The air conditioning system also includes a first control valve, which is located in the high-pressure piping.

2. The air conditioning system as described in claim 1, characterized in that, The air conditioning system also includes a second control valve, which is located on the second branch pipe.

3. The air conditioning system as described in claim 1, characterized in that, The first switch and / or the second switch is a three-way valve or a four-way valve.

4. The air conditioning system according to any one of claims 1 to 3, characterized in that, The air conditioning system also includes a first switching valve, which is located on the first piping and between the first intersection and the outdoor heat exchanger.

5. The air conditioning system according to any one of claims 1 to 3, characterized in that, The air conditioning system also includes a second switching valve, which is located on the second piping.

6. The air conditioning system according to any one of claims 1 to 3, characterized in that, The air conditioning system also includes a third switching valve, which is located on the high-pressure piping.

7. The air conditioning system according to any one of claims 1 to 3, characterized in that, The air conditioning system also includes a third branch pipe branching off from the second piping, the third branch pipe connecting the second piping and the indoor heat exchanger, and the third branch pipe being equipped with a third control valve.

8. The air conditioning system according to any one of claims 1 to 3, characterized in that, The air conditioning system also includes an economizer, which is installed on the first piping between the outdoor heat exchanger and the first intersection point, and the return pipe of the economizer is connected to the return gas side of the compressor.

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