Air conditioning system

Abstract

This application relates to the field of air conditioning technology and discloses an air conditioning system, including: an air conditioning unit, comprising a compressor, an outdoor heat exchanger, and a first indoor heat exchanger and a second indoor heat exchanger connected in parallel; wherein the outdoor heat exchanger is simultaneously connected to the first indoor heat exchanger and the second indoor heat exchanger via a first liquid pipe, the first indoor heat exchanger is connected to the compressor's suction port via a first gas pipe, and the second indoor heat exchanger is connected to the compressor's suction port via a second gas pipe; a floor heating unit, comprising a floor heating coil, the first end of which is connected to the first liquid pipe via a first floor heating branch, and the second end of which is connected to the second gas pipe via a second floor heating branch; a water supply unit, comprising a water supply tank and a water tank coil for heating the water supply tank, the first end of which is connected to the first liquid pipe via a first water tank branch; the second end of which is connected to the compressor's exhaust port via a second water tank branch, and / or, the second end of which is connected to the second gas pipe via a third water tank branch.

Description

Technical Field

[0001] This application relates to the field of air conditioner technology, for example, to an air conditioning system. Background Technology

[0002] With the development of technology and the improvement of people's living standards, air conditioners have become widely used, and people's requirements for air conditioners are also getting higher and higher, leading to continuous optimization of their performance. Among these advancements, the three-pipe air conditioning system has emerged, applicable in various heat exchange scenarios. Compared to a two-pipe system, the three-pipe system adds a third high- and low-pressure pipe, enabling multiple functional modes, such as simultaneous cooling and heating mode, and reheat dehumidification mode.

[0003] In the process of implementing the embodiments of this disclosure, at least the following problems were found in the related art:

[0004] In some scenarios, three-pipe air conditioning systems may release condensation waste heat directly into the environment, resulting in low energy efficiency.

[0005] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0006] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0007] This disclosure provides an air conditioning system that solves the problem of low energy utilization in air conditioning systems.

[0008] In some embodiments, the air conditioning system includes:

[0009] An air conditioning unit includes a compressor, an outdoor heat exchanger, and a first indoor heat exchanger and a second indoor heat exchanger connected in parallel. The outdoor heat exchanger is connected to both the first indoor heat exchanger and the second indoor heat exchanger via a first liquid pipe. The first indoor heat exchanger is connected to the compressor's suction port via a first gas pipe, and the second indoor heat exchanger is connected to the compressor's suction port via a second gas pipe.

[0010] The underfloor heating unit includes an underfloor heating coil, the first end of which is connected to a first liquid pipe via a first underfloor heating branch, and the second end of which is connected to a second gas pipe via a second underfloor heating branch.

[0011] The water supply unit includes a water supply tank and a water tank coil for heating the water supply tank. The first end of the water tank coil is connected to a first liquid pipe through a first water tank branch. The second end of the water tank coil is connected to the exhaust port of the compressor through a second water tank branch. And / or, the second end of the water tank coil is connected to a second gas pipe through a third water tank branch.

[0012] The air conditioning system provided in this embodiment can achieve the following technical effects:

[0013] The air conditioning unit regulates indoor temperature through the first and second indoor heat exchangers. The underfloor heating unit regulates indoor temperature through underfloor heating coils. The water supply unit regulates the temperature of the water supply tank through the water tank coil, and then provides domestic water to users through the water supply tank. This achieves a three-in-one supply function for cooling, heating, and domestic water supply. Specifically, the refrigerant discharged from the compressor can flow into the water tank coil sequentially through the second gas pipe and the third water tank branch, or the refrigerant discharged from the compressor can flow directly into the water tank coil through the second water tank branch, thereby using the water tank coil to regulate the temperature of the water supply tank and meet the user's water needs. Simultaneously, with the three-pipe layout of the air conditioning unit, the first and second indoor heat exchangers can achieve dual evaporation temperatures, enabling the air conditioning system to form multiple functional modes. Thus, the air conditioning system of this application combines a three-pipe system and a three-in-one supply system, and can utilize the condensation waste heat of the air conditioning unit to supply the water supply unit, thereby improving the energy utilization rate of the air conditioning system.

[0014] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0015] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0016] Figure 1 This is a schematic diagram of the structure of an air conditioning system provided in an embodiment of this disclosure;

[0017] Figure 2 This is a schematic diagram of the refrigerant flow direction in the cooling + hot water mode provided in the embodiments of this disclosure;

[0018] Figure 3 This is a schematic diagram of the refrigerant flow direction in the heating + hot water mode provided in the embodiments of this disclosure;

[0019] Figure 4 This is a schematic diagram of the refrigerant flow direction in the simultaneous hot and cold + hot water mode provided in this embodiment of the disclosure;

[0020] Figure 5This is a schematic diagram of the refrigerant flow direction in the reheat dehumidification + hot water mode provided in the embodiments of this disclosure;

[0021] Figure 6 This is a schematic diagram of the refrigerant flow direction in the hot water mode provided in this embodiment of the disclosure;

[0022] Figure 7 This is a schematic diagram of one connection position of the second water tank branch provided in an embodiment of this disclosure;

[0023] Figure 8 This is a schematic diagram of another connection position of the second water tank branch provided in an embodiment of this disclosure;

[0024] Figure 9 This is a schematic diagram of defrosting the first outdoor heat exchanger provided in an embodiment of this disclosure;

[0025] Figure 10 This is a schematic diagram of defrosting the second outdoor heat exchanger provided in an embodiment of this disclosure.

[0026] Figure label:

[0027] 1. Compressor; 11. Inlet; 111. First Inlet; 112. Second Inlet; 12. First Multi-way Valve; 13. Second Multi-way Valve; 14. Outdoor Heat Exchanger; 141. Third Throttling Device; 142. First Outdoor Heat Exchanger; 143. Second Outdoor Heat Exchanger; 144. Fifth Throttling Device;

[0028] 2. Liquid reservoir; 21. First inlet / outlet pipe; 22. Second inlet / outlet pipe; 23. Third inlet / outlet pipe; 24. First liquid pipe; 241. First pipe section; 242. Second pipe section; 25. First gas pipe; 26. Second gas pipe;

[0029] 3. Water supply tank; 31. Water tank coil; 311. First water tank branch; 312. Second water tank branch; 313. Third water tank branch; 314. Three-way valve; 315. First conductive element; 316. Second conductive element; 317. Third conductive element; 32. Underfloor heating coil; 321. First underfloor heating branch; 322. Second underfloor heating branch; 323. Fourth conductive element; 324. Fifth conductive element;

[0030] 4. Indoor heat exchange module; 401. First module; 402. Second module; 41. First indoor heat exchanger; 411. First throttling device; 42. Second indoor heat exchanger; 421. Second throttling device. Detailed Implementation

[0031] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0032] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for describing embodiments of this disclosure herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0033] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this disclosure according to the specific circumstances.

[0034] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0035] Unless otherwise stated, the term "multiple" means two or more.

[0036] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0037] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0038] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0039] This disclosure provides an air conditioning system, which includes an air conditioning unit, a floor heating unit, and a water supply unit. For example... Figure 1 As shown, the air conditioning unit includes a compressor 1, an outdoor heat exchanger 14, and a first indoor heat exchanger 41 and a second indoor heat exchanger 42 connected in parallel. The outdoor heat exchanger 14 is connected to both the first indoor heat exchanger 41 and the second indoor heat exchanger 42 via a first liquid pipe 24. The first indoor heat exchanger 41 is connected to the suction port 11 of the compressor 1 via a first gas pipe 25, and the second indoor heat exchanger 42 is connected to the suction port 11 of the compressor 1 via a second gas pipe 26. The underfloor heating unit includes an underfloor heating coil 32. The first end of the underfloor heating coil 32 is connected to the first liquid pipe 24 via a first underfloor heating branch 321, and the second end of the underfloor heating coil 32 is connected to the second gas pipe 26 via a second underfloor heating branch 322. The water supply unit includes a water supply tank 3 and a water tank coil 31 for heating the water supply tank 3. The first end of the water tank coil 31 is connected to the first liquid pipe 24 through the first water tank branch 311; the second end of the water tank coil 31 is connected to the exhaust port of the compressor 1 through the second water tank branch 312, and / or, the second end of the water tank coil 31 is connected to the second gas pipe 26 through the third water tank branch 313.

[0040] In this embodiment, the air conditioning unit regulates the indoor temperature through the first indoor heat exchanger 41 and the second indoor heat exchanger 42. The underfloor heating unit regulates the indoor temperature through the underfloor heating coil 32. The water supply unit regulates the temperature of the water supply tank 3 through the water tank coil 31, and then provides domestic water to users through the water supply tank 3. This achieves the three-in-one function of cooling, heating, and domestic water supply. Specifically, the refrigerant discharged from the compressor 1 can flow into the water tank coil 31 sequentially through the second gas pipe 26 and the third water tank branch 313, or the refrigerant discharged from the compressor 1 can directly flow into the water tank coil 31 through the second water tank branch 312, and then use the water tank coil 31 to regulate the temperature of the water supply tank 3, thereby using the water supply tank 3 to meet the user's water needs. At the same time, with the three-pipe layout of the air conditioning unit, the first indoor heat exchanger 41 and the second indoor heat exchanger 42 can achieve dual evaporation temperatures, enabling the air conditioning system to form multiple functional modes. In this way, the air conditioning system of this application combines the three-pipe system and the three-supply system, and can use the condensation waste heat of the air conditioning unit to supply the water supply unit, thereby improving the energy utilization rate of the air conditioning system.

[0041] Optionally, such as Figure 1As shown, when the water supply unit has both a second water tank branch 312 and a third water tank branch 313, the water supply unit also includes a three-way valve 314. The three-way valve 314 includes valve port a, valve port b, and valve port c. Valve port a is connected to the second end of the water tank coil 31, valve port b is connected to the second water tank branch 312, and valve port c is connected to the third water tank branch 313.

[0042] In this embodiment, the refrigerant source for the water tank coil 31 can be selected by controlling the connection state of the three-way valve 314. When valve port a and valve port b are connected, the refrigerant flows into the water tank coil 31 from the second water tank branch 312. When valve port a and valve port c are connected, the refrigerant flows into the water tank coil 31 from the third water tank branch 313.

[0043] Optionally, the first indoor heat exchanger 41 and the second indoor heat exchanger 42 form an indoor heat exchange module 4, and the connection state of the three-way valve 314 is controlled according to the load of the indoor heat exchange module 4. In this embodiment, the load of the indoor heat exchange module 4 is denoted as f, and the preset load is denoted as F. The controller of the air conditioning system controls the state of the three-way valve 314. When f < F, it means that the load of the indoor heat exchange module 4 is small. At this time, the controller controls valve port a and valve port c to connect, and the refrigerant enters the water tank coil 31 through the third water tank branch 313. When f ≥ F, it means that the load of the indoor heat exchange module 4 is large. At this time, the controller controls valve port a and valve port b to connect, and the refrigerant enters the water tank coil 31 through the second water tank branch 312. In this way, switching the third water tank branch 313 when the load is small can meet the temperature requirements of the water supply tank 3, which helps to reduce system energy consumption. Switching to the second water tank branch 312 under heavy load can reduce pipeline pressure drop, which helps ensure that sufficient refrigerant enters the water tank coil 31, thereby meeting the temperature requirements of the water supply tank 3.

[0044] Optionally, the first water tank branch 311 is provided with a first conductive element 315, which is used to control the on / off state of the first water tank branch 311. The second water tank branch 312 is provided with a second conductive element 316, which is used to control the on / off state of the second water tank branch 312. The third water tank branch 313 is provided with a third conductive element 317, which is used to control the on / off state of the third water tank branch 313.

[0045] Optionally, a fourth conductive element 323 is provided on the first underfloor heating branch 321, which is used to control the on / off state of the first underfloor heating branch 321. A fifth conductive element 324 is provided on the second underfloor heating branch 322, which is used to control the on / off state of the second underfloor heating branch 322.

[0046] Optionally, the compressor 1 includes a first compression cylinder and a second compression cylinder. The first compression cylinder includes a first intake port 111, and the second compression cylinder includes a second intake port 112. A first air pipe 25 is connected to the first intake port 111 via a first multi-way valve 12, and a second air pipe 26 is connected to the second intake port 112 via a second multi-way valve 13.

[0047] In this embodiment, compressor 1 can be referred to as a dual-suction single-row compressor. The gas compressed by the first compression cylinder and the gas compressed by the second compression cylinder merge at the exhaust port and flow to the outdoor heat exchanger 14 through the first multi-way valve 12. The first gas pipe 25 is connected to the first suction port 111 through the first multi-way valve 12, and the second gas pipe 26 is connected to the second suction port 112 through the second multi-way valve 13. In this way, by arranging the first gas pipe 25 and the second gas pipe 26, the first indoor heat exchanger 41 and the second indoor heat exchanger 42 can achieve different evaporation temperatures.

[0048] Optionally, the first multi-way valve 12 includes valve ports C, D, S, and E, and the second multi-way valve 13 includes valve ports J, K, M, and N. The discharge port of the compressor 1 is connected to valve port D, and valve port C is connected to the outdoor heat exchanger 14. The first indoor heat exchanger 41 is connected to valve port E via the first gas pipe 25, and valve port S is connected to the first suction port 111. The second indoor heat exchanger 42 is connected to valve port N via the second gas pipe 26, and valve port M is connected to the second suction port 112.

[0049] Optionally, the water supply unit may have only a third water tank branch 313.

[0050] In this embodiment, the air conditioning system has a cooling + hot water mode, and the refrigerant circulation path is as follows: Figure 2 As shown. The third throttling device 141 does not throttle, the first throttling device 411 throttles, and the second throttling device 421 is closed. Furthermore, the fourth conducting element 323 and the fifth conducting element 324 are closed, and the underfloor heating coil 32 stops working.

[0051] The refrigerant discharged from compressor 1 has two flow paths: the first path is sequentially through valve port D, valve port C, outdoor heat exchanger 14, and first liquid pipe 24; the second path is sequentially through valve port K, valve port N, second gas pipe 26, third water tank branch 313, water tank coil 31, first water tank branch 311, and first liquid pipe 24. Then, the refrigerant in the first liquid pipe 24 flows through the first throttling device 411 to the first indoor heat exchanger 41, and finally, the refrigerant in the first indoor heat exchanger 41 flows sequentially through the first gas pipe 25, valve port E, and valve port S to compressor 1. At this time, the first indoor heat exchanger 41 provides cooling, and the water tank coil 31 heats the water supply tank 3.

[0052] In this embodiment, the air conditioning system has a heating + hot water mode, and the refrigerant circulation path is as follows: Figure 3As shown. Among them, the third throttling device 141 performs throttling, while the first throttling device 411 and the second throttling device do not throttle.

[0053] The refrigerant discharged from compressor 1 has two flow paths: the first path is sequentially through valve port D, valve port E, first gas pipe 25, first indoor heat exchanger 41, and first liquid pipe 24; the second path is sequentially through valve port K, valve port N, second gas pipe 26, second indoor heat exchanger 42, underfloor heating coil 32, and third water tank branch 313 (the three are connected in parallel), and first liquid pipe 24. Finally, the refrigerant in the first liquid pipe 24 flows sequentially through the third throttling device 141, outdoor heat exchanger 14, valve port C, and valve port S to compressor 1. At this time, heating is provided by the first indoor heat exchanger 41, the second indoor heat exchanger 42, and the underfloor heating coil 32, and the water tank coil 31 heats the water supply tank 3.

[0054] In this embodiment, the air conditioning system has a simultaneous cooling / heating + hot water mode, and the refrigerant circulation path is as follows: Figure 4 As shown. The room is equipped with two indoor heat exchange modules 4, referred to as the first module 401 and the second module 402 respectively. Among them, the third throttling device 141 does not throttle, the first throttling device 411 of the first module 401 is closed and the second throttling device 421 does not throttle, and the first throttling device 411 of the second module 402 throttles and the second throttling device 421 is closed.

[0055] The refrigerant discharged from compressor 1 has two flow paths: the first path is sequentially through valve port D, valve port C, outdoor heat exchanger 14, and first liquid pipe 24; the second path is sequentially through valve port K, valve port N, second gas pipe 26, second indoor heat exchanger 42 of first module 401, underfloor heating coil 32, and third water tank branch 313 (the three are connected in parallel). The refrigerant from the second indoor heat exchanger 42 and underfloor heating coil 32 of first module 401 flows to the first liquid pipe 24, and the refrigerant from the third water tank branch 313 flows to the water tank coil 31. Finally, the refrigerant from the first liquid pipe 24 flows sequentially through the first indoor heat exchanger 41 of second module 402, first gas pipe 25, valve port E, and valve port S to compressor 1. At this time, heating is provided by first module 401 and underfloor heating coil 32, cooling is provided by second module 402, and water supply tank 3 is heated by water tank coil 31.

[0056] In this embodiment, the system has a reheat dehumidification + hot water mode, and the refrigerant circulation path is as follows: Figure 5 As shown. The third throttling device 141 does not throttle, the second throttling device 421 does not throttle, and the first throttling device 411 throttles. Furthermore, the fourth conducting element 323 and the fifth conducting element 324 are closed, and the underfloor heating coil 32 stops working.

[0057] The refrigerant discharged from compressor 1 has two flow paths: the first path is sequentially through valve port D, valve port C, outdoor heat exchanger 14, and first liquid pipe 24; the second path is sequentially through valve port K, valve port N, second gas pipe 26, second indoor heat exchanger 42, and third water tank branch 313 (connected in parallel). The refrigerant flows from the second indoor heat exchanger 42 to the first liquid pipe 24, and from the third water tank branch 313 to the water tank coil 31. Finally, the refrigerant in the first liquid pipe 24 flows sequentially from the first indoor heat exchanger 41, first gas pipe 25, valve port E, and valve port S to compressor 1. At this point, the first indoor heat exchanger 41 is used for dehumidification, the second indoor heat exchanger 42 is used for reheating, and the water tank coil 31 is used to heat the water supply tank 3.

[0058] In this embodiment, the system has a hot water mode, and the refrigerant circulation path is as follows: Figure 6 As shown. The first throttling device 411 and the second throttling device 421 are both closed, the third throttling device 141 is throttling, and the fourth conducting element 323 and the fifth conducting element 324 are both closed. The refrigerant discharge from compressor 1 flows through the following path: valve port K, valve port N, second gas pipe 26, third water tank branch 313, water tank coil 31, first water tank branch 311, first liquid pipe 24, third throttling device 141, outdoor heat exchanger 14, valve port C, valve port S, compressor 1.

[0059] Optionally, the water supply unit has only a second water tank branch 312. The first end of the second water tank branch 312 is connected to the water tank coil 31, and the second end of the second water tank branch 312 is connected between the exhaust port of the compressor 1 and the valve port K.

[0060] In this embodiment, in the cooling + hot water mode, the refrigerant circulation path is as follows: Figure 7 As shown, the third throttling device 141 does not throttle, while the first throttling device 411 and the second throttling device 421 throttle. Furthermore, the fourth conducting element 323 and the fifth conducting element 324 are closed, and the underfloor heating coil 32 stops working. The refrigerant discharged from the compressor 1 has two flow paths: the first path is sequentially valve port D, valve port C, outdoor heat exchanger 14, and first liquid pipe 24; the second path is sequentially sequentially second water tank branch 312, water tank coil 31, first water tank branch 311, and third inlet / outlet pipe 23. At this time, cooling is achieved using the first indoor heat exchanger 41 and the second indoor heat exchanger 42, and heating of the water supply tank 3 is achieved using the water tank coil 31.

[0061] In this embodiment, in hot water mode, both the first throttling device 411 and the second throttling device 421 are closed, the third throttling device 141 throttles, and both the fourth conducting element 323 and the fifth conducting element 324 are closed. The flow path of the refrigerant discharged from the compressor 1 is as follows: second water tank branch 312, water tank coil 31, first water tank branch 311, first liquid pipe 24, third throttling device 141, outdoor heat exchanger 14, valve port C, valve port S, compressor 1.

[0062] In this embodiment, in the heating + hot water mode, the simultaneous heating and cooling + hot water mode, and the reheat dehumidification + hot water mode, compared with the mode with only the third water tank branch 313, the states of multiple conducting elements and throttling devices are the same. The difference is that the refrigerant discharged by the compressor 1 needs to flow into the water tank coil 31 through the second water tank branch 312.

[0063] Optionally, the second multi-way valve 13 includes valve port J, valve port K, valve port M and valve port N, the second air pipe 26 is connected to the second air intake port 112 through valve port N and valve port M in sequence, and the exhaust port of the compressor 1 is connected to valve port K; and when the water supply unit has both a second water tank branch 312 and a third water tank branch 313, the first end of the second water tank branch 312 is connected to the water tank coil 31, and the second end of the second water tank branch 312 is connected to valve port J.

[0064] In this embodiment, in the cooling + hot water mode, the refrigerant circulation path is as follows: Figure 8 As shown. In this configuration, the third throttling device 141 does not throttle, while the first throttling device 411 and the second throttling device 421 throttle. Furthermore, the fourth conducting element 323 and the fifth conducting element 324 are closed, and the underfloor heating coil 32 stops operating. The refrigerant discharged from the compressor 1 has two flow paths: the first path is sequentially valve port D, valve port C, outdoor heat exchanger 14, and first liquid pipe 24; the second path is sequentially valve port K, valve port J, second water tank branch 312, water tank coil 31, first water tank branch 311, and first liquid pipe 24. Then, the refrigerant in the first liquid pipe 24 flows through the first throttling device 411 and the second throttling device 421 to the first indoor heat exchanger 41 and the second indoor heat exchanger 42, respectively.

[0065] In this embodiment, in hot water mode, the first throttling device 411 and the second throttling device 421 are both closed, the third throttling device 141 throttles, and the fourth conducting element 323 and the fifth conducting element 324 are both closed. The flow path of the refrigerant discharged from the compressor 1 is as follows: valve port K, valve port J, second water tank branch 312, water tank coil 31, first water tank branch 311, first liquid pipe 24, third throttling device 141, outdoor heat exchanger 14, valve port C, valve port S, compressor 1.

[0066] In this embodiment, the heating + hot water mode, the simultaneous heating and cooling + hot water mode, and the reheat dehumidification + hot water mode are the same as the mode corresponding to the case with only the third water tank branch 313. At this time, only the third water tank branch 313 is used to supply refrigerant to the water tank coil 31, and the second water tank branch 312 is not used.

[0067] Optionally, such as Figure 7 and Figure 8As shown, the air conditioning unit also includes a liquid receiver 2, which includes a first inlet / outlet pipe 21, a second inlet / outlet pipe 22, and a third inlet / outlet pipe 23. The first liquid pipe 24 includes a first pipe section 241 and a second pipe section 242. The outdoor heat exchanger 14 is connected to the first inlet / outlet pipe 21 through the first pipe section 241, and the second inlet / outlet pipe 22 is connected to the first indoor heat exchanger 41 and the second indoor heat exchanger 42 through the second pipe section 242. The first end of the water tank coil 31 is connected to the third inlet / outlet pipe 23 through the first water tank branch 311.

[0068] In this embodiment, since the air conditioning system includes multiple terminals, the different functions and operating conditions of the different terminals will lead to differences in the state and pressure of the corresponding refrigerant. By setting the liquid receiver 2 and its connected piping layout, the refrigerant from different terminals can be fully mixed in the liquid receiver 2. The mixed refrigerant is then throttled to avoid two-phase throttling, thereby effectively reducing noise. For example, in the cooling + hot water mode, the refrigerant from the outdoor heat exchanger 14 and the water tank coil 31 is mixed in the liquid receiver 2. The refrigerant from different terminals is more uniform and the pressure is more stable through mixing, and then flows to the indoor heat exchange module 4 through the second inlet and outlet pipes 22, thereby effectively reducing the noise generated at the first throttling device 411 and the second throttling device 421.

[0069] Optionally, the outdoor heat exchanger includes a first outdoor heat exchanger 142 and a second outdoor heat exchanger 143 connected in parallel. The first end of the first outdoor heat exchanger 142 is connected to the first inlet / outlet pipe 21 via a third throttling device 141, and the second end of the first outdoor heat exchanger 142 is connected to the first intake port 111 via a first multi-way valve 12. The first end of the second outdoor heat exchanger 143 is connected to the first inlet / outlet pipe 21 via a fifth throttling device 144, and the second end of the second outdoor heat exchanger 143 is connected to the second intake port 112 via a second multi-way valve 13. In this embodiment, the first end of the first outdoor heat exchanger 142 is connected to the first pipe section 241 via the third throttling device 141, and the second end of the first outdoor heat exchanger 142 is connected to valve port J. The first end of the second outdoor heat exchanger 143 is connected to the first pipe section 241 via the fifth throttling device 144, and the second end of the second outdoor heat exchanger 143 is connected to valve port C.

[0070] In this embodiment, the system has a non-stop defrosting + hot water mode, which can defrost the first outdoor heat exchanger 142 and the second outdoor heat exchanger 143 while producing hot water.

[0071] When defrosting the first outdoor heat exchanger 142, the refrigerant circulation path is as follows: Figure 9 As shown. Among them, the first throttling device 411 does not throttle, the second throttling device 421 throttles, the third throttling device 141 does not throttle, and the fifth throttling device 144 is closed.

[0072] The refrigerant discharged from compressor 1 has three flow paths: the first path is sequentially: valve port D, valve port E, first gas pipe 25, first indoor heat exchanger 41, and second pipe section 242; the second path is sequentially: valve port K, valve port J, first outdoor heat exchanger 142, third throttling device 141, first pipe section 241, liquid receiver 2, and second pipe section 242; the third path is sequentially: second water tank branch 312, water tank coil 31, first water tank branch 311, liquid receiver 2, and second pipe section 242. Thus, under the action of the second flow path, the high-temperature refrigerant defrosts as it flows through the first outdoor heat exchanger 142. Then, the refrigerant in the second pipe section 242 flows sequentially from the second indoor heat exchanger 42, second gas pipe 26, valve port N, and valve port M to compressor 1.

[0073] When defrosting the second outdoor heat exchanger 143, the refrigerant circulation path is as follows: Figure 10 As shown. Among them, the first throttling device 411 performs throttling, the second throttling device 421 does not throttle, the fifth throttling device 144 does not throttle, and the third throttling device 141 is closed.

[0074] The refrigerant discharged from compressor 1 has three flow paths: the first path is sequentially: valve port D, valve port C, second outdoor heat exchanger 143, first pipe section 241, liquid receiver 2, and second pipe section 242; the second path is sequentially: valve port K, valve port N, second gas pipe 26, second indoor heat exchanger 42, and second pipe section 242; the third path is sequentially: second water tank branch 312, water tank coil 31, first water tank branch 311, liquid receiver 2, and second pipe section 242. Thus, under the action of the first flow path, the high-temperature refrigerant defrosts as it flows through the second outdoor heat exchanger 143. Then, the refrigerant in the second pipe section 242 flows sequentially from the first indoor heat exchanger 41, first gas pipe 25, valve port E, and valve port S to compressor 1.

[0075] The foregoing description and accompanying drawings fully illustrate embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included or substituted for parts and features of other embodiments. Embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims.

Claims

1. An air conditioning system, characterized by, include: An air conditioning unit includes a compressor (1), an outdoor heat exchanger (14), and a first indoor heat exchanger (41) and a second indoor heat exchanger (42) connected in parallel. The outdoor heat exchanger (14) is connected to both the first indoor heat exchanger (41) and the second indoor heat exchanger (42) through a first liquid pipe (24). The first indoor heat exchanger (41) is connected to the suction port (11) of the compressor (1) through a first gas pipe (25). The second indoor heat exchanger (42) is connected to the suction port (11) of the compressor (1) through a second gas pipe (26). The underfloor heating unit includes an underfloor heating coil (32), the first end of which is connected to the first liquid pipe (24) through the first underfloor heating branch (321), and the second end of which is connected to the second gas pipe (26) through the second underfloor heating branch (322). The water supply unit includes a water supply tank (3) and a water tank coil (31) for heating the water supply tank (3). The first end of the water tank coil (31) is connected to the first liquid pipe (24) through the first water tank branch (311); the second end of the water tank coil (31) is connected to the exhaust port of the compressor (1) through the second water tank branch (312), and / or, the second end of the water tank coil (31) is connected to the second gas pipe (26) through the third water tank branch (313).

2. The air conditioning system according to claim 1, characterized in that, When the water supply unit has both a second water tank branch (312) and a third water tank branch (313), the water supply unit includes a three-way valve (314), which includes valve port a, valve port b and valve port c; Among them, valve port a is connected to the second end of the water tank coil (31), valve port b is connected to the second water tank branch (312), and valve port c is connected to the third water tank branch (313).

3. The air conditioning system according to claim 1, characterized in that, The first water tank branch (311) is provided with a first conductive element (315); When the water supply unit has a second water tank branch (312), a second conductive element (316) is provided on the second water tank branch (312); when the water supply unit has a third water tank branch (313), a third conductive element (317) is provided on the third water tank branch (313).

4. The air conditioning system according to claim 1, characterized in that, The first underfloor heating branch (321) is provided with a fourth conductive element (323), and the second underfloor heating branch (322) is provided with a fifth conductive element (324).

5. The air conditioning system according to claim 1, characterized in that, The air conditioning unit also includes a liquid receiver (2), which includes a first inlet / outlet pipe (21), a second inlet / outlet pipe (22), and a third inlet / outlet pipe (23); The first liquid pipe (24) includes a first pipe section (241) and a second pipe section (242). The outdoor heat exchanger (14) is connected to the first inlet and outlet pipe (21) through the first pipe section (241). The second inlet and outlet pipe (22) is connected to the first indoor heat exchanger (41) and the second indoor heat exchanger (42) through the second pipe section (242). The first end of the water tank coil (31) is connected to the third inlet and outlet pipe (23) through the first water tank branch (311).

6. The air conditioning system according to any one of claims 1 to 5, characterized in that, The compressor (1) includes a first compression cylinder and a second compression cylinder. The first compression cylinder includes a first suction port (111), and the second compression cylinder includes a second suction port (112). The first air tube (25) is connected to the first air inlet (111) through the first multi-way valve (12), and the second air tube (26) is connected to the second air inlet (112) through the second multi-way valve (13).

7. The air conditioning system according to claim 6, characterized in that, The second multi-way valve (13) includes valve port J, valve port K, valve port M and valve port N. The second air pipe (26) is connected to the second air intake port (112) through valve port N and valve port M in sequence. The exhaust port of the compressor (1) is connected to valve port K. Furthermore, when the water supply unit has both a second water tank branch (312) and a third water tank branch (313), the first end of the second water tank branch (312) is connected to the water tank coil (31), and the second end of the second water tank branch (312) is connected to the valve port J.

8. The air conditioning system according to claim 6, characterized in that, The second multi-way valve (13) includes valve port J, valve port K, valve port M and valve port N. The second air pipe (26) is connected to the second air intake port (112) through valve port N and valve port M in sequence. The exhaust port of the compressor (1) is connected to valve port K. Furthermore, when the water supply unit only has a second water tank branch (312), the first end of the second water tank branch (312) is connected to the water tank coil (31), and the second end of the second water tank branch (312) is connected between the exhaust port of the compressor (1) and the valve port K.

9. The air conditioning system according to any one of claims 1 to 5, characterized in that, The first indoor heat exchanger (41) and the second indoor heat exchanger (42) form an indoor heat exchange module (4). The air conditioning unit includes multiple indoor heat exchange modules (4), and the multiple indoor heat exchange modules (4) are connected in parallel to the first liquid pipe (24).

10. The air conditioning system according to claim 6, characterized in that, The outdoor heat exchanger includes a first outdoor heat exchanger (142) and a second outdoor heat exchanger (143) connected in parallel. The first end of the first outdoor heat exchanger (142) is connected to the first inlet and outlet pipe (21) through the third throttling device (141), and the second end of the first outdoor heat exchanger (142) is connected to the first air intake (111) through the first multi-way valve (12). The first end of the second outdoor heat exchanger (143) is communicated with the first inlet and outlet pipe (21) through the fifth throttling device (144), and the second end of the second outdoor heat exchanger (143) is communicated with the second suction port (112) in turn through the second multi-way valve (13).

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