Air conditioning system

Abstract

The present invention discloses an air conditioning system. The air conditioning system includes an outdoor unit, a dehumidification and reheat unit, and a floor heating unit. The outdoor unit includes a compressor and an outdoor heat exchanger. The dehumidification and reheat unit includes a dehumidification heat exchanger, a dehumidification throttling device, a reheat heat exchanger, and a reheat throttling device. The floor heating unit includes a floor heating coil and a floor heating throttling device. The air conditioning system has a dehumidification circuit, a reheat circuit, and a floor heating circuit. The air conditioning system of the present invention can achieve cooling, heating, or floor heating functions.

Description

Technical Field

[0001] The present invention relates to the technical field of air-conditioning systems, and in particular to an air-conditioning system. Background Art

[0002] Currently, air conditioning and floor heating systems are typically separated, providing cooling, heating, or heating for indoor environments. However, these two systems don't share or integrate components, requiring additional installation space. Therefore, there is an urgent need for an air conditioning system that can integrate cooling, heating, or floor heating functions. Summary of the Invention

[0003] The main purpose of the present invention is to provide an air-conditioning system, aiming to provide an air-conditioning system that can achieve cooling, heating or floor heating functions.

[0004] To achieve the above objectives, the present invention provides an air conditioning system, comprising an outdoor unit, a dehumidification and reheating unit, and a floor heating unit. The outdoor unit comprises a compressor and an outdoor heat exchanger. The dehumidification and reheating unit comprises a dehumidification heat exchanger, a dehumidification throttling device, a reheating heat exchanger, and a reheating throttling device. The floor heating unit comprises a floor heating coil and a floor heating throttling device.

[0005] The air conditioning system further includes an exhaust pipe connected to the exhaust side of the compression mechanism, a return pipe connected to the return side of the compressor, a first pipe sequentially connecting the exhaust pipe, the outdoor heat exchanger, the dehumidification throttling device, and the dehumidification heat exchanger, and a second pipe connecting the dehumidification heat exchanger and the return pipe, thereby forming a dehumidification circuit;

[0006] The air conditioning system further includes a high-pressure pipe, the high-pressure pipe sequentially connecting a first intersection of the first pipe, the reheat throttling device, the reheat heat exchanger, and the exhaust pipe to form a reheat circuit, wherein the first intersection is located between the outdoor heat exchanger and the dehumidification throttling device;

[0007] The air-conditioning system also includes a first branch pipe branching off from a second intersection of the first pipe and a second branch pipe branching off from the second pipe, the first branch pipe sequentially connecting the floor heating coil, the floor heating throttling device and the second branch pipe to form a floor heating circuit, wherein the second intersection is located between the outdoor heat exchanger and the dehumidification throttling device.

[0008] Optionally, the air conditioning system further includes a first switch, which can switch between a first state and a second state, wherein:

[0009] In the first state, the first switch connects the exhaust pipe to the first pipe;

[0010] In the second state, the first switch connects the return air pipe to the first pipe.

[0011] Optionally, the air conditioning system further includes a second switch, which can switch between a third state and a fourth state, wherein:

[0012] In the third state, the second switch connects the exhaust pipe to the second pipe;

[0013] In the fourth state, the first switch connects the return air pipe and the second pipe.

[0014] Optionally, the first switch and / or the second switch is a three-way valve or a four-way valve.

[0015] Optionally, the air conditioning system further includes a first control valve provided on the first pipe, wherein the first control valve is located between the outdoor heat exchanger and the dehumidification throttling device.

[0016] Optionally, the air conditioning system further includes a second control valve provided on the second pipe, and the second control valve is located between the dehumidification heat exchanger and the return air pipe.

[0017] Optionally, the air conditioning system further includes a third control valve provided on the high-pressure pipe, wherein the third control valve is located between the reheat heat exchanger and the exhaust pipe.

[0018] Optionally, the air conditioning system further includes a third branch pipe branching off from the second pipe, so as to connect the dehumidification heat exchanger and the second pipe through the third branch pipe, and the third branch pipe is provided with a fourth control valve.

[0019] Optionally, the air conditioner further includes a fourth branch pipe branching from the second pipe, and the fourth branch pipe is provided with a fifth control valve.

[0020] Optionally, the air conditioning system further comprises an indoor unit, wherein the indoor unit comprises an indoor heat exchanger and an indoor throttling device;

[0021] The air-conditioning system also includes a fifth branch pipe branching off from a second intersection of the first pipe and a sixth branch pipe branching off from the second pipe, the second intersection being located between the dehumidification throttling device and the outdoor heat exchanger, the fifth branch pipe, the indoor throttling device, the indoor heat exchanger, and the sixth branch pipe being connected in sequence.

[0022] Optionally, the indoor unit further includes a sixth control valve, and the sixth control valve is provided on the sixth branch pipe.

[0023] Optionally, the air conditioner further includes an economizer, which is disposed on a first pipe between the outdoor heat exchanger and the first intersection, and a return pipe of the economizer is connected to a return air side of the compressor.

[0024] According to the technical solution of the present invention, in the dehumidification and reheat unit, the dehumidification circuit where the dehumidification heat exchanger is located can realize cooling, and condense the water vapor in the humid air into water vapor during cooling; and the reheat circuit where the reheat heat exchanger is located can realize heating, so that the two cooperate to realize constant temperature dehumidification and realize three-pipe dehumidification and reheating. In addition, floor heating can be realized through the floor heating circuit where the floor heating circuit of the floor heating unit is located. It can be seen that in the air-conditioning system of the present invention, the dehumidification and reheat unit and the floor heating unit share the same outdoor unit and some pipeline components (such as the first piping and the second piping), with a higher degree of integration and stronger functionality. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0026] Figure 1 This is a structural principle diagram of an embodiment of an air conditioning system of the present invention;

[0027] Figure 2 for Figure 1 Schematic diagram of cooling mode 1 of the air conditioning system;

[0028] Figure 3 for Figure 1 Schematic diagram of heating mode 1 of the air conditioning system;

[0029] Figure 4 for Figure 1 Schematic diagram of heating mode 2 of the air conditioning system;

[0030] Figure 5 for Figure 1 Schematic diagram of the constant temperature and dehumidification mode of the air conditioning system;

[0031] Figure 6 for Figure 1 Schematic diagram of floor heating mode in air conditioning system;

[0032] Figure 7 This is a schematic diagram of cooling mode 2 in another embodiment of the air-conditioning system of the present invention;

[0033] Figure 8 This is a schematic diagram of cooling mode 3 in another embodiment of the air-conditioning system of the present invention;

[0034] Figure 9 for Figure 8 Schematic diagram of heating mode 3 of the air conditioning system.

[0035] Description of Figure Numbers:

[0036]

[0037]

[0038] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0040] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0041] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features specified as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0042] An embodiment of the present invention provides an air conditioning system, which is integrated with a floor heating system, thereby being able to realize operating modes such as cooling mode, heating mode, constant temperature dehumidification mode, and floor heating mode.

[0043] See also Figure 1In one embodiment of the present invention, the air conditioning system includes an outdoor unit 100, a dehumidification and reheat unit 200, and a floor heating unit 300. The outdoor unit 100 includes a compressor 110 and an outdoor heat exchanger 130. The dehumidification and reheat unit 200 includes a dehumidification heat exchanger 210, a dehumidification throttling device 220, a reheat heat exchanger 230, and a reheat throttling device 240. The floor heating unit 300 includes a floor heating coil 310 and a floor heating throttling device 320. The floor heating coil 310 can be a capillary coil.

[0044] It should be noted that, for the air conditioning system, the outdoor unit 100 exchanges heat with the outdoor environment and is not specifically located outdoors. Similarly, the indoor unit 400 described later exchanges heat with the indoor environment and is not specifically located indoors. For example, if the air conditioning system is a window air conditioner, the outdoor unit 100 and indoor unit 400 are housed in the same housing, and the outdoor unit 100 exchanges heat with the outdoor environment. If the air conditioning system is a split air conditioner, the outdoor unit 100 and indoor unit 400 are housed in separate housings, with the housing containing the outdoor unit 100 located outdoors and the housing containing the indoor unit 400 located indoors.

[0045] The air-conditioning system also includes an exhaust pipe 111 connected to the exhaust side of the compressor 110, a return air pipe 112 connected to the return air side of the compressor 110, a first pipe 500 connected in sequence to the exhaust pipe 111, the outdoor heat exchanger 130, the dehumidification throttling device 220, and the dehumidification heat exchanger 210, and a second pipe 600 connecting the dehumidification heat exchanger 210 and the return air pipe 112, thereby forming a dehumidification circuit.

[0046] The air-conditioning system also includes a high-pressure pipe 700, which connects the first intersection 510 of the first pipe 500, the reheat throttling device 240, the reheat heat exchanger 230 and the exhaust pipe 111 in sequence to form a reheat circuit, wherein the first intersection 510 is located between the outdoor heat exchanger 130 and the dehumidification throttling device 220.

[0047] The air-conditioning system also includes a first branch pipe 101 branching off from the second intersection 520 of the first piping 500, and a second branch pipe 102 branching off from the second piping 600. The first branch pipe 101 is connected in sequence to the floor heating coil 310, the floor heating throttling device 320, and the second branch pipe 102 to form a floor heating circuit, wherein the second intersection 520 is located between the outdoor heat exchanger 130 and the dehumidification throttling device 220.

[0048] The above-mentioned throttling devices may be implemented in various forms, such as throttling valves, capillaries, electronic expansion valves, etc. For example, but not limited to, the dehumidification throttling device 220, the reheat throttling device 240, or the floor heating throttling device 320 may include a throttling valve.

[0049] According to the technical solution of the embodiment of the present invention, in the dehumidification and reheating unit 200, the dehumidification circuit where the dehumidification heat exchanger 210 is located can realize cooling, and condense the water vapor in the humid air into water vapor during cooling; and the reheating circuit where the reheat heat exchanger 230 is located can realize heating, so that the two cooperate to realize constant temperature dehumidification and realize three-pipe dehumidification and reheating. In addition, through the floor heating circuit where the floor heating circuit of the floor heating unit 300 is located, floor heating can be realized. It can be seen that in the air-conditioning system of the present invention, the dehumidification and reheating unit 200 and the floor heating unit 300 share the same outdoor unit 100 and some pipeline components (such as the first piping 500 and the second piping 600), with a higher degree of integration and stronger functionality.

[0050] See also Figure 1 Based on the above embodiment, the air conditioning system further includes an oil separator 120, which is disposed on the exhaust pipe 111 of the compressor 110. The air conditioning system further includes a first switch 160, which can be switched between a first state and a second state. In the first state, the first switch 160 connects the exhaust pipe 111 to the first pipe 500; in the second state, the first switch 160 connects the return pipe 112 to the first pipe 500.

[0051] By setting the first switch 160, in a first state, the air conditioning system is in a cooling state, for example, the dehumidification heat exchanger 210 and / or the reheat heat exchanger 230 are in cooling mode; in a second state, the air conditioning system is in a heating state, for example, the dehumidification heat exchanger 210 and / or the reheat heat exchanger 230 are in heating mode, and / or the floor heating heat exchanger is in heating mode. Detailed descriptions will be given later.

[0052] Furthermore, the air conditioning system includes a second switch 170 that can be switched between a third state and a fourth state. In the third state, the second switch 170 connects the exhaust pipe 111 to the second pipe 600; in the fourth state, the first switch 160 connects the return pipe 112 to the second pipe 600.

[0053] By setting the second switch 170 in conjunction with the first switch 160, the air-conditioning system can be in a cooling state in the third state, such as the dehumidification heat exchanger 210 and / or the reheat heat exchanger 230 cooling; in the fourth state, the air-conditioning system is in a heating state, such as the dehumidification heat exchanger 210 and / or the reheat heat exchanger 230 heating, and / or the floor heating heat exchanger heating. In this way, a variety of functions that exceed those that can be achieved by a conventional four-way valve can be achieved. For example, when cooling, the first switch 160 switches to the first state, and at the same time switches the second switch 170 to the third state; when heating, the first switch 160 switches to the second state, and at the same time switches the second switch 170 to the fourth state. Details will be introduced in detail later.

[0054] It should be noted that the first switch 160 and / or the second switch 170 are three-way valves or four-way valves. The first switch 160 and the second switch 170 can exist simultaneously, or one of them can be used in conjunction with other connecting valve structures (such as a two-way valve) to enable the air conditioner to switch between four modes: constant temperature dehumidification, heating only, cooling only, and floor heating. In this embodiment, the first switch 160 and the second switch 170 are both four-way valves, one end of which is configured as a normally closed end.

[0055] Specifically, first switch 160 has terminals D1, C1, E1, and S1, with terminal E1 configured as a normally closed terminal. Terminal D1 is connected to the exhaust pipe 111 of compressor 110, terminal C1 is connected in turn to the outdoor heat exchanger 130, and terminal S1 is connected to the return air pipe 112 of compressor 110. In the first state of first switch 160, terminals D1 and C1 of first switch 160 are connected. In the second state of first switch 160, terminals C1 and S1 of first switch 160 are connected.

[0056] Second switch 170 has terminals D2, C2, E2, and S2, with terminal C2 configured as a normally closed terminal. Terminal D2 is connected to exhaust pipe 111 of compressor 110, terminal E2 is connected to second piping 600, and terminal S2 is connected to return air pipe 112 of compressor 110. In the third state of second switch 170, terminals E2 and S2 of second switch 170 are connected. In the fourth state of second switch 170, terminals D2 and S2 of second switch 170 are connected.

[0057] See also Figure 1 In one embodiment, in order to switch the air conditioner between different modes, the air conditioning system further includes a first control valve k1 provided on the first pipe 500, the first control valve k1 being located between the outdoor heat exchanger 130 and the dehumidification throttling device 220. The first control valve k1 can control the on-off of the first pipe 500. The air conditioning system further includes a second control valve k2 provided on the second pipe 600, the second control valve k2 being located between the dehumidification heat exchanger 210 and the return air pipe 112. The second control valve k2 can control the on-off of the second pipe 600. The air conditioning system further includes a third control valve k3 provided on the high-pressure pipe 700, the third control valve k3 being located between the reheat heat exchanger 230 and the exhaust pipe 111. The third control valve k3 can control the on-off of the high-pressure pipe 700.

[0058] The following is a detailed explanation of each mode of the air conditioning system:

[0059] See also Figure 2 , cooling mode 1 of the air conditioning system:

[0060] In cooling mode 1, the first switch 160 is in the first state, and the second switch 170 is in the third state. Compressor 110 discharges high-temperature, high-pressure refrigerant from exhaust pipe 111. The refrigerant then enters the D1 terminal of the first switch 160 and exits the C1 terminal. It then flows through first piping 500 to the outdoor heat exchanger 130 for liquefaction. The liquefied refrigerant then passes through first control valve k1 and enters the dehumidification heat exchanger 210 for evaporative cooling. The evaporated refrigerant from the dehumidification heat exchanger 210 then passes through second piping 600, second control valve k2, and enters the E2 terminal of the second switch 170, exiting the S2 terminal. Finally, it flows through gas-liquid separator 150 and return pipe 112 back to compressor 110 for further circulation, achieving single-stage cooling. At this point, third control valve k3 should be closed.

[0061] See also Figure 3 , heating mode 1 of the air conditioning system:

[0062] In heating mode 1, first switch 160 is in the second state, and second switch 170 is in the fourth state. Compressor 110 discharges high-temperature, high-pressure refrigerant from exhaust pipe 111. The refrigerant then enters the D2 terminal of second switch 170 and exits the E2 terminal. The refrigerant then flows through second pipe 600 and second control valve k2 to dehumidification heat exchanger 210 for liquefaction and heating. The liquefied refrigerant then flows through first pipe 500 and second control valve k2 to outdoor heat exchanger 130 for evaporation. The evaporated refrigerant then enters the C1 terminal of first switch 160 and exits the S1 terminal. Finally, it flows through gas-liquid separator 150 and return pipe 112 back to compressor 110 for further circulation, achieving heating only mode.

[0063] See also Figure 4 , heating mode 2 of the air conditioning system:

[0064] In heating mode 2, the first switch 160 is in the second state, and the second switch 170 is completely closed. The compressor 110 discharges high-temperature, high-pressure refrigerant from the exhaust pipe 111, which enters the reheat heat exchanger 230 through the high-pressure pipe 700 for liquefaction and heating. The liquefied refrigerant is discharged from the reheat heat exchanger 230 and enters the outdoor heat exchanger 130 through the first pipe 500 and the first control valve k1 for evaporation. The evaporated refrigerant enters the C1 end of the first switch 160 and exits its S1 end. Finally, it flows back to the compressor 110 through the gas-liquid separator 150 and the return pipe 112, undergoing a further cycle to achieve single heating. In heating mode 2, the second control valve k2 should be closed. Heating mode 2 differs from heating mode 1 in that heating is performed using the reheat heat exchanger 230.

[0065] See also Figure 5, constant temperature dehumidification mode of air conditioning system:

[0066] In this constant temperature dehumidification mode, first switch 160 is in the second state, and second switch 170 is in the fourth state. Compressor 110 discharges high-temperature, high-pressure refrigerant from exhaust pipe 111, which is then divided into two parts. The first part of the refrigerant enters through terminal D1 of first switch 160 and exits through terminal C1. The first part then flows through first piping 500 into outdoor heat exchanger 130 for liquefaction. The liquefied refrigerant then flows through first control valve k1 into dehumidification heat exchanger 210.

[0067] The second part of the refrigerant enters the reheat heat exchanger from the high-pressure pipe 700 and the third control valve k3 (which is in the open state at this time) for liquefaction and heating. The liquefied refrigerant is discharged from the reheat heat exchanger 230, and then enters the dehumidification heat exchanger 210 through the reheat throttling device 240 and the first intersection 510 of the first pipe 500, and merges with the aforementioned first part of the refrigerant. The merged refrigerant is evaporated and cooled and dehumidified by the dehumidification heat exchanger 210. The refrigerant discharged from the dehumidification heat exchanger 210 after evaporation flows through the second pipe 600 and the second control valve k2 to the first switch 160, enters from the E2 end of the second switch 170 and exits from its S2 end, and finally flows back to the compressor 110 through the gas-liquid separator 150 and the return air pipe 112 for recirculation.

[0068] It can be seen that in the constant temperature dehumidification mode, the dehumidification heat exchanger 210 cools and dehumidifies, while the reheat heat exchanger 230 heats, and the two cooperate to achieve constant temperature dehumidification.

[0069] See also Figure 6 , floor heating mode of air conditioning system:

[0070] In this floor heating mode, first switch 160 is in the second state, and second switch 170 is in the fourth state. Compressor 110 discharges high-temperature, high-pressure refrigerant from exhaust pipe 111. The refrigerant then enters the D2 port of second switch 170 and exits at its E2 port. The refrigerant then flows through second pipe 600, second control valve k2, and first branch pipe 101 to the floor heating coil 310 for liquefaction and heating. The liquefied refrigerant then flows through second branch pipe 102, floor heating throttling device 320, first pipe 500, and first control valve k1 to the outdoor heat exchanger 130 for evaporation. The evaporated refrigerant then enters the C1 port of first switch 160 and exits at its S1 port. Finally, it flows through gas-liquid separator 150 and return pipe 112 back to compressor 110, where it circulates again, achieving floor heating.

[0071] In addition, the floor heating mode and heating mode 1 of the air-conditioning system should be able to be turned on at the same time or one of them should be turned on selectively. When the two modes are turned on at the same time, the two modes can cooperate to heat the room quickly and improve the heating efficiency.

[0072] See also Figure 7 In one embodiment, considering that in the above-mentioned floor heating mode, the power is high and the energy consumption is large, the load pressure on the power supply system is also large. Here, in order to reduce the energy consumption pressure of the air-conditioning system, the opening of other heat exchangers can be minimized (such as closing the dehumidification heat exchanger 210, etc.). For example, the flow rate can be adjusted to zero through the dehumidification throttling device 220. However, it is inevitable that a small amount of refrigerant will enter the dehumidification heat exchanger 210 from the dehumidification throttling device 220, resulting in a reduction of refrigerant in the floor heating circuit and a reduction in the floor heating heating efficiency.

[0073] Therefore, to solve the above problem, the air conditioning system also includes a third branch pipe 103 branching off from the second pipe 600, so as to connect the dehumidification heat exchanger 210 to the second pipe 600 via the third branch pipe 103. The third branch pipe 103 is provided with a fourth control valve k4. The fourth control valve k4 can control the on-off of the third branch pipe 103. For example, in the floor heating mode, the fourth control valve k4 is closed so that the refrigerant in the floor heating circuit cannot enter the dehumidification heat exchanger 210, ensuring that the floor heating circuit has sufficient refrigerant and improving the heating efficiency of the floor heating. As for the reheat heat exchanger 230, it can be closed via the third control valve k3 and the reheat throttling device 240.

[0074] Please continue reading Figure 7 In one embodiment, considering that in cooling mode 1, only the dehumidification heat exchanger 210 is used for cooling, to improve cooling efficiency, the air conditioner further includes a fourth branch pipe 104 branching from the second pipe 600. The fourth branch pipe 104 is provided with a fifth control valve k5. Therefore, based on cooling mode 1, opening the fourth control valve k5 enables cooling mode 2. The details are as follows:

[0075] See also Figure 7 , cooling mode 2 of the air conditioning system:

[0076] In Cooling Mode 1, the refrigerant liquefied in the outdoor heat exchanger 130 passes through the first control valve k1 and is split into two parts at the first intersection 510 of the first pipe 500. The first part enters the dehumidifying heat exchanger 210 for evaporative cooling. The gaseous refrigerant discharged from the dehumidifying heat exchanger 210 flows into the second pipe 600. The second part enters the reheat heat exchanger 230 for evaporative cooling. The gaseous refrigerant discharged from the reheat heat exchanger 230 flows through the fourth branch pipe 104 and the fifth control valve k5 into the second pipe 600. After merging with the first part of the refrigerant, it flows through the second control valve k2 to the second switch 170, enters the E2 terminal of the second switch 170, and exits the S2 terminal. Finally, it flows through the gas-liquid separator 150 and the return gas pipe 112 back to the compressor 110 for further circulation, achieving single-stage cooling. At this time, the third control valve k3 should be closed.

[0077] As can be seen, in Cooling Mode 2, the simultaneous use of dehumidification heat exchanger 210 and reheat heat exchanger 230 for cooling achieves higher cooling efficiency compared to cooling using a single heat exchanger. The fan can be used to dissipate the cooling energy generated by dehumidification heat exchanger 210 and reheat heat exchanger 230 in different directions, thereby increasing the cooling capacity delivered to different locations. To activate the constant temperature dehumidification mode, open the third control valve k3 and close the fifth control valve k5. This allows a single heat exchanger to be used in different modes, enhancing its functionality.

[0078] See also Figure 8 Based on any of the above embodiments, the air-conditioning system further includes an indoor unit 400. The heat exchanger included in each indoor unit 400 may be of different types, such as an indoor unit with a constant temperature dehumidification function (having both a dehumidification heat exchanger 210 and a reheat heat exchanger 230), an ordinary cooling / heating indoor unit (having only one heat exchanger 410 and a corresponding throttling device 420), and an indoor unit with a conversion device that can freely switch between cooling and heating states, one or more of which allows the air conditioner to simultaneously perform mixed operations such as constant temperature dehumidification, cooling, and heating.

[0079] In this embodiment, the indoor unit 400 includes an indoor heat exchanger 410 and an indoor throttling device 420, which may include a throttle valve. The air conditioning system also includes a fifth branch pipe 105 branching from the second intersection 520 of the first pipe 500 and a sixth branch pipe 106 branching from the second pipe 600. The second intersection 520 is located between the dehumidification throttling device 220 and the outdoor heat exchanger 130. The fifth branch pipe 105, the indoor throttling device 420, the indoor heat exchanger 410, and the sixth branch pipe 106 are sequentially connected. This indoor unit 400 can achieve cooling mode 3 and heating mode 3.

[0080] See also Figure 8 , cooling mode 3 of the air conditioning system:

[0081] In cooling mode 3, the first switch 160 is in the first state, and the second switch 170 is in the third state. Compressor 110 discharges high-temperature, high-pressure refrigerant from exhaust pipe 111. The refrigerant then enters the D1 terminal of the first switch 160 and exits the C1 terminal. It then flows through first piping 500 to the outdoor heat exchanger 130 for liquefaction. The liquefied refrigerant then passes through first control valve k1 and the fifth branch pipe 105 into indoor heat exchanger 410 for evaporative cooling. The vaporized refrigerant then evaporates in indoor heat exchanger 410 and passes through sixth branch pipe 106, second piping 600, and second control valve k2. It then enters the E2 terminal of the second switch 170 and exits the S2 terminal. Finally, it flows through gas-liquid separator 150 and return pipe 112 back to compressor 110 for further circulation, achieving single-stage cooling. At this point, third control valve k3 should be closed.

[0082] See also Figure 9 , heating mode 3 of the air conditioning system:

[0083] In heating mode 3, first switch 160 is in the second state, and second switch 170 is in the fourth state. Compressor 110 discharges high-temperature, high-pressure refrigerant from exhaust pipe 111. The refrigerant then enters the D2 terminal of second switch 170 and exits the E2 terminal. The refrigerant then flows through second pipe 600, second control valve k2, and sixth branch pipe 106 to enter indoor heat exchanger 410 for liquefaction and heating. The liquefied refrigerant then flows through fifth branch pipe 105, first pipe 500, and second control valve k2 to enter outdoor heat exchanger 130 for evaporation. The evaporated refrigerant then enters the C1 terminal of first switch 160 and exits the S1 terminal. Finally, it flows through gas-liquid separator 150 and return pipe 112 back to compressor 110 for further circulation, achieving heating only mode.

[0084] It is worth mentioning that cooling mode 3 can be turned on simultaneously with cooling mode 1 and cooling mode 2, or one of them can be turned on alternatively. Heating mode 3 can also be turned on simultaneously with heating mode 1 and floor heating mode, or one of them can be turned on alternatively.

[0085] See also Figure 8 and Figure 9In one embodiment, the air conditioning system also places a relatively high load on the power supply system in the aforementioned floor heating mode or in various heating modes. To reduce the energy consumption pressure of the air conditioning system, the indoor heat exchanger 410 can be shut down during its operation mode. For example, the flow rate can be adjusted to zero via the indoor throttling device 420. However, it is inevitable that a small amount of refrigerant will enter the dehumidification indoor heat exchanger 410 from the indoor throttling device 420, resulting in a reduction in the refrigerant in the current operation mode circuit and a reduction in the efficiency of the current operation mode.

[0086] Therefore, to address the above issues, the indoor unit 400 also includes a sixth control valve k6, which is located on the sixth branch pipe 106. This sixth control valve k6 can control the opening and closing of the sixth branch pipe 106, thereby enabling flexible switching between various operating modes. Furthermore, the switched circuits are less likely to leak refrigerant into other circuits. For example, in floor heating mode, closing the sixth control valve k6 prevents refrigerant in the floor heating circuit from entering the indoor heat exchanger 410, ensuring sufficient refrigerant in the floor heating circuit and improving the heating efficiency of the floor heating system.

[0087] See also Figure 1 Based on any of the above embodiments, to prevent the vapor-liquid two-phase refrigerant from producing unpleasant noise when passing through the indoor throttling device 420, the air conditioner further includes an economizer 140. The economizer 140 is disposed on the first piping 500 between the outdoor heat exchanger 130 and the first intersection 510. The return pipe 141 of the economizer 140 is connected to the gas-liquid separator 150. The return pipe can be in various forms. The return pipe can include only a return pipe body, or it can include the return pipe body and a first connecting pipe, one end of the first connecting pipe being connected to the return pipe body, and the other end of the first connecting pipe being connected to the gas-liquid separator 150.

[0088] For ease of control, in some examples, the return pipe 141 is connected to the gas-liquid separator 150 through the return pipe 112 , and a seventh control valve is provided on the return pipe 141 or the second connecting pipe between the return pipe and the return pipe 112 .

[0089] The embodiment of the present invention adopts a system design with an economizer 140 on the basis of a three-pipe dehumidification and reheating solution, and controls the liquid intake throttling valve (electronic expansion valve) in the system design loop with the economizer 140 to further reduce the condensation temperature of the refrigerant at the outlet of the outdoor heat exchanger 130, thereby increasing the degree of supercooling and completely condensing the refrigerant into a liquid state. The liquid refrigerant enters the indoor heat exchanger 410 after throttling and reducing the pressure by the indoor electronic expansion valve to absorb heat and evaporate. When the refrigerant passing through the indoor throttling device 420 is in a fully liquid state, the abnormal noise of the refrigerant generated by the gas-liquid two-phase state can be resolved.

[0090] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in 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, a dehumidification and reheating unit and a floor heating unit. The outdoor unit includes a compressor and an outdoor heat exchanger. The dehumidification and reheating unit includes a dehumidification heat exchanger, a dehumidification throttling device, a reheating heat exchanger and a reheating throttling device. The floor heating unit includes a floor heating coil and a floor heating throttling device. The air conditioning system further includes an exhaust pipe connected to the exhaust side of the compression mechanism, a return pipe connected to the return side of the compressor, a first pipe sequentially connecting the exhaust pipe, the outdoor heat exchanger, the dehumidification throttling device, and the dehumidification heat exchanger, and a second pipe connecting the dehumidification heat exchanger and the return pipe, thereby forming a dehumidification circuit; The air conditioning system further includes a high-pressure pipe, which sequentially connects a first intersection of the first pipe, the reheat throttling device, the reheat heat exchanger, and the exhaust pipe to form a reheat circuit, wherein the first intersection is located between the outdoor heat exchanger and the dehumidification throttling device; The air conditioning system further includes a first branch pipe branching off from a second intersection of the first pipe and a second branch pipe branching off from the second pipe, the first branch pipe sequentially connecting the floor heating coil, the floor heating throttling device, and the second branch pipe to form a floor heating circuit, wherein the second intersection is located between the outdoor heat exchanger and the dehumidification throttling device; The air conditioning system further includes a first switch and a second switch, each having four ports and one normally closed end, the three ports of the first switch being connected to the high-pressure pipe, the outdoor unit, and the return air pipe, respectively, and the three ports of the second switch being connected to the high-pressure pipe, the second pipe, and the return air pipe, respectively; The first switch has a first state connecting the exhaust pipe to the first pipe and a second state connecting the return pipe to the first pipe. The second switch has a third state connecting the exhaust pipe to the second pipe and a fourth state connecting the return pipe to the second pipe.

2. The air conditioning system according to claim 1, wherein: The air conditioning system further includes a first control valve provided in the first pipe, wherein the first control valve is located between the outdoor heat exchanger and the dehumidification throttling device.

3. The air conditioning system according to claim 1, wherein: The air conditioning system further includes a second control valve provided on the second pipe, wherein the second control valve is located between the dehumidification heat exchanger and the return air pipe.

4. The air conditioning system according to claim 1, wherein: The air conditioning system further includes a third control valve provided on the high-pressure pipe, wherein the third control valve is located between the reheat heat exchanger and the exhaust pipe.

5. The air conditioning system according to claim 1, wherein: The air conditioning system further includes a third branch pipe branching from the second pipe, so as to connect the dehumidification heat exchanger and the second pipe through the third branch pipe, and the third branch pipe is provided with a fourth control valve.

6. The air conditioning system according to any one of claims 1 to 5, characterized in that: The air conditioning system further includes a fourth branch pipe branching from the second pipe, and the fourth branch pipe is provided with a fifth control valve.

7. The air conditioning system according to any one of claims 1 to 5, characterized in that: The air conditioning system further comprises an indoor unit, wherein the indoor unit comprises an indoor heat exchanger and an indoor throttling device; The air-conditioning system also includes a fifth branch pipe branching off from a second intersection of the first pipe and a sixth branch pipe branching off from the second pipe, the second intersection being located between the dehumidification throttling device and the outdoor heat exchanger, the fifth branch pipe, the indoor throttling device, the indoor heat exchanger, and the sixth branch pipe being connected in sequence.

8. The air conditioning system according to claim 7, wherein: The indoor unit further includes a sixth control valve, which is provided on the sixth branch pipe.

9. The air conditioning system according to any one of claims 1 to 5, characterized in that: The air conditioning system further includes an economizer, which is disposed on a first pipe between the outdoor heat exchanger and the first intersection. A return pipe of the economizer is in communication with a return air side of the compressor.

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