Air conditioning unit

Abstract

The air conditioning unit comprises an outdoor unit, a water module and an indoor unit, and the outdoor unit comprises a compressor, an outdoor heat exchanger, a first four-way valve and a second four-way valve; the water module comprises a first plate heat exchanger and a second plate heat exchanger. The indoor unit comprises a fresh air indoor unit, an exhaust indoor unit and at least one circulating indoor unit. The fresh air indoor unit, the exhaust indoor unit and the circulating indoor unit are respectively connected with the first plate heat exchanger or the second plate heat exchanger through corresponding circulating water paths; according to the air conditioning unit, only one system is needed, integration of ventilation, temperature adjustment and heat recovery functions can be achieved, installation is simpler, and cost is low; the fresh air indoor unit and the exhaust indoor unit can be matched with the water module to achieve the heat recovery function while achieving indoor and outdoor air circulation, a total heat exchanger product does not need to be developed independently, and product generalization is facilitated.

Description

Technical Field

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

[0002] In densely populated places such as office buildings, shopping malls, and even homes, there is a high demand for air conditioning. It is necessary to control the indoor temperature to a comfortable level and ensure the indoor air is fresh. Moreover, the performance requirements of air conditioning vary in different seasons. Therefore, the combination of air conditioning and total heat exchanger is generally used to meet these requirements. The air conditioner is used to regulate the indoor temperature, and the total heat exchanger is used to recover heat to make full use of the indoor temperature and improve heat exchange performance. To achieve the above functions, two independent systems are usually required, which takes up a lot of space, is complicated to install and maintain, and is costly. Summary of the Invention

[0003] The purpose of this invention is to provide an air conditioning unit that solves the problems of existing technologies that require separate installation of two devices, an air conditioner and a total heat exchanger, to achieve the combined functions of indoor temperature regulation and heat recovery, resulting in complex assembly and high costs.

[0004] To achieve the above-mentioned objectives, the present invention employs the following technical solution: This invention proposes an air conditioning unit, which includes: The outdoor unit includes a compressor, an outdoor heat exchanger, a first four-way valve, and a second four-way valve connected via refrigerant piping. The water module includes a first plate heat exchanger and a second plate heat exchanger. Both the first plate heat exchanger and the second plate heat exchanger include a refrigeration channel and a cooling channel. One end of the two refrigeration channels is connected by an intermediate pipeline, and the other end is connected to different valve ports of the second four-way valve. An indoor unit includes a fresh air indoor unit, an exhaust air indoor unit, and at least one recirculation indoor unit. The fresh air indoor unit is connected to the outside through a fresh air inlet pipe and to each room through a fresh air outlet pipe. The exhaust air indoor unit is connected to each room through a stale air inlet pipe and to the outside through a stale air outlet pipe. The fresh air indoor unit, the exhaust indoor unit, and the circulating indoor unit are respectively connected to the cooling channel in the first plate heat exchanger or the second plate heat exchanger through corresponding circulating water circuits.

[0005] In some embodiments of this application, the first port of the first four-way valve is connected to the output port of the compressor, the second port of the first four-way valve is connected to the first port of the second four-way valve, the third port of the first four-way valve is connected to the input port of the compressor, and the fourth port of the first four-way valve is connected to one end of the outdoor heat exchanger; the second port of the second four-way valve is connected to the refrigeration channel of the first plate heat exchanger, the third port of the second four-way valve is connected to the other end of the outdoor heat exchanger, the fourth port of the second four-way valve is connected to the refrigeration channel of the second plate heat exchanger, an outdoor expansion valve is provided between the outdoor heat exchanger and the third port, the first plate heat exchanger is connected to a first expansion valve, and the second plate heat exchanger is connected to a second expansion valve.

[0006] The first valve port is selectively connected to the second valve port or the fourth valve port, and the first port can be selectively connected to the second valve port or the fourth valve port to control the flow path of the high-temperature and high-pressure refrigerant output from the output end of the compressor.

[0007] Specifically, during heating, the first valve port is connected to the second valve port, the third valve port is connected to the fourth valve port, the first port is connected to the second port, and the third port is connected to the fourth port. The high-temperature and high-pressure refrigerant output from the compressor passes through the first valve port, the second valve port, the first port, and the second port, and is then transported to the cooling channel inside the first plate heat exchanger to enable the first plate heat exchanger to heat. During refrigeration, the first valve port is connected to the fourth valve port, the second valve port is connected to the third valve port, the first port is connected to the fourth port, and the second port is connected to the third port. The high-temperature and high-pressure refrigerant output from the compressor is delivered to the outdoor heat exchanger after passing through the first valve port and the fourth valve port, and then delivered to the first plate heat exchanger after passing through the third port and the second port.

[0008] In some embodiments of this application, the exhaust indoor unit includes an exhaust heat exchanger and an exhaust fan, and the exhaust heat exchanger is connected to the cooling channel in the first plate heat exchanger or the second plate heat exchanger through a first circulating water circuit. The fresh air indoor unit includes a fresh air heat exchanger and a fresh air fan. The fresh air heat exchanger is connected to the cooling channel in the first plate heat exchanger or the second plate heat exchanger through a second circulating water circuit. The circulating indoor unit includes a circulating heat exchanger and a circulating fan. The circulating heat exchanger is connected to the cooling channel in the first plate heat exchanger or the second plate heat exchanger through a third circulating water channel. The first circulating water path, the second circulating water path, and the third circulating water path are all equipped with shut-off valves.

[0009] The exhaust heat exchanger, fresh air heat exchanger, and circulating heat exchanger are selectively connected to the cooling channel in the first plate heat exchanger or the second plate heat exchanger, so that the water in the corresponding circulating water circuit exchanges heat with the refrigerant in the cooling channel to achieve the purpose of cooling or heating.

[0010] In some embodiments of this application, the cooling channel of the first plate heat exchanger is connected to a first inlet water pipe and a first return water pipe at both ends, and the cooling channel of the second plate heat exchanger is connected to a second inlet water pipe and a second return water pipe at both ends. A first water pump is provided on the first inlet water pipe, and a second water pump is provided on the second inlet water pipe. One end of the first circulating water circuit is connected to the first inlet pipe or the second inlet pipe through a first three-way valve, and the other end of the first circulating water circuit is connected to the first return water circuit or the second return water circuit through a first three-way valve. One end of the second circulating water circuit is connected to the first inlet pipe or the second inlet pipe through a second three-way valve, and the other end of the first circulating water circuit is connected to the first return water circuit or the second return water circuit through a second three-way valve. One end of each of the third circulating water circuits is connected to the first inlet pipe or the second inlet pipe through a third three-way valve, and the other end of the first circulating water circuit is connected to the first return water pipe or the second return water pipe through a third three-way valve.

[0011] When the first water pump is turned on, it drives the water flow in the circulating water circuit connected to the first inlet water pipe and the first return water pipe, so that the water flow in the corresponding circulating water circuit passes through the cooling channel in the first plate heat exchanger for heat exchange; when the second water pump is turned on, it drives the water flow in the circulating water circuit connected to the second inlet water pipe and the second return water pipe, so that the water flow in the corresponding circulating water circuit passes through the cooling channel in the second plate heat exchanger for heat exchange.

[0012] In some embodiments of this application, in the internal circulation mode, the controller controls the corresponding circulation fan to turn on in order to realize air circulation in the corresponding room; In fresh air mode, the controller activates the fresh air fan and the exhaust fan to achieve indoor and outdoor air circulation.

[0013] In internal circulation mode, the outdoor unit and water module do not start, the fresh air indoor unit and exhaust indoor unit do not work, and the circulating fan in the circulation indoor unit turns on to circulate the indoor air and improve user comfort.

[0014] In fresh air mode, the outdoor unit and water module do not start, the circulating indoor unit does not work, the fresh air fan in the fresh air indoor unit works, and the exhaust fan in the exhaust indoor unit works, introducing fresh air from the outside into the room through the fresh air indoor unit and exhausting stale air from the room to the outside through the exhaust indoor unit, maintaining the freshness of the air in the room and ensuring user comfort.

[0015] In some embodiments of this application, in heating mode, the controller controls the circulating fan to start, the first valve port is connected to the second valve port, the third valve port is connected to the fourth valve port, the first port is connected to the second port, and the third port is connected to the fourth port; the first expansion valve and the second expansion valve are fully open, and the first water pump is started; the two ends of the corresponding third circulating water circuit are connected to the first inlet pipe and the first return water circuit through the third three-way valve, the two ends of the first circulating water circuit are connected to the second inlet pipe and the second return water circuit through the first three-way valve, and the two ends of the second circulating water circuit are connected to the second inlet pipe and the second return water circuit through the second three-way valve; In heating mode, the fresh air indoor unit and exhaust indoor unit do not work, while the outdoor unit and water module start. The circulating indoor unit works, and the high-temperature and high-pressure refrigerant output from the compressor first passes through the first four-way valve and the second four-way valve and is then transported to the refrigeration channel in the first plate heat exchanger. The refrigerant in the refrigeration channel condenses and releases heat, transferring the heat to the cooling channel in the first plate heat exchanger, heating the water in the cooling channel. The first expansion valve and the second expansion valve do not throttle, and the refrigerant enters the outdoor heat exchanger after being throttled by the outdoor expansion valve, evaporating and absorbing heat from the outside. The first water pump drives the water flow in the third circulating water circuit, and delivers the heated water to the circulating heat exchanger to release heat and heat the chamber. In cooling mode, the controller controls the circulating fan to start, the first valve port and the fourth valve port are connected, the second valve port and the third valve port are connected; the first port is connected to the fourth port, and the second port is connected to the third port; the outdoor electronic expansion valve and the first expansion valve are fully open; the second water pump starts, and the two ends of the corresponding third circulating water circuit are connected to the second inlet pipe and the second return pipe through the third three-way valve; the two ends of the first circulating water circuit are connected to the first inlet pipe and the first return pipe through the first three-way valve, and the two ends of the second circulating water circuit are connected to the first inlet pipe and the first return pipe through the second three-way valve.

[0016] During cooling, the fresh air indoor unit and exhaust indoor unit do not work, while the outdoor unit and water module start up. The circulating indoor unit works, and the high-temperature and high-pressure refrigerant output from the compressor is first transported to the outdoor heat exchanger through the first four-way valve for condensation and heat release. Then, the refrigerant output from the outdoor heat exchanger is transported to the first plate heat exchanger through the second four-way valve. Since the first water pump is not turned on, the refrigerant does not undergo heat exchange in the first plate heat exchanger. The refrigerant output from the first plate heat exchanger is throttled by the second expansion valve and then transported to the second plate heat exchanger for evaporation and heat absorption, cooling the water flowing through its cooling channel. The second water pump is turned on, and the third circulating water circuit, which is connected to the cooling channel of the second plate heat exchanger, delivers the cooled water to the circulating heat exchanger to cool the compartment.

[0017] In some embodiments of this application, under the heating + heat recovery fresh air mode, the controller controls the exhaust fan, the fresh air fan, and the corresponding circulating fan to turn on. The first valve port is connected to the second valve port, the third valve port is connected to the fourth valve port, the first port is connected to the second port, and the third port is connected to the fourth port. The first expansion valve is fully open, and the outdoor electronic expansion valve and the second expansion valve are opened to a preset opening degree. The first water pump and the second water pump are turned on. The two ends of the first circulating water circuit are connected to the second inlet water circuit and the second return water circuit through the first three-way valve. The two ends of the second circulating water circuit are connected to the first inlet water circuit and the first return water circuit through the second three-way valve. The two ends of the third circulating water circuit are connected to the first inlet water circuit and the first return water circuit through the third three-way valve.

[0018] In some embodiments of this application, under the heating + heat recovery fresh air mode, the circulating indoor unit, the exhaust indoor unit, and the fresh air indoor unit all operate, and the outdoor unit and water module are all started. The high-temperature and high-pressure refrigerant output by the compressor is first transported to the refrigeration channel in the first plate heat exchanger through the first four-way valve and the second four-way valve. The refrigerant in the refrigeration channel condenses and releases heat, transferring the heat to the cooling channel in the first plate heat exchanger to heat the water in the cooling channel. The refrigerant output from the first plate heat exchanger is throttled by the second expansion valve and then transported to the refrigeration channel in the second plate heat exchanger to cool the water in its cooling channel. The refrigerant output from the second plate heat exchanger evaporates and absorbs heat again through the outdoor electronic expansion valve, absorbing heat from the outdoor environment. Finally, the refrigerant returns to the compressor.

[0019] The first water pump drives the water flow in the second and third circulating water circuits connected to it. The water in the second and third circulating water circuits absorbs heat in the first plate heat exchanger and is then delivered to the fresh air heat exchanger and the circulating heat exchanger respectively to heat the fresh air delivered to the room and the airflow in the room. The second water pump drives the water flow in the first circulating water circuit connected to it. The water in the first circulating water circuit is cooled down after being heated by the refrigerant in the second plate heat exchanger. The cooled water is then delivered to the exhaust heat exchanger to exchange heat with the airflow discharged from the room and to recover heat from the stale air in the room. In other words, the circulating fan heats the circulating air in the room; the fresh air fan heats the fresh, cool air from outside the room and introduces it into the room; and the exhaust fan recovers the heat from the stale, hot air in the room and exhausts it outside, ensuring that the air in the room is both fresh and warm in winter.

[0020] In some embodiments of this application, under the cooling + heat recovery fresh air mode, the controller controls the exhaust fan, the fresh air fan, and the corresponding circulating fan to turn on. The first valve port and the fourth valve port are connected, and the second valve port and the third valve port are connected. The first port is connected to the fourth port, and the second port is connected to the third port. The first expansion valve and the outdoor electronic expansion valve are fully open, and the second expansion valve is opened to a preset opening degree. The first water pump and the second water pump are turned on. The two ends of the first circulating water circuit are connected to the first inlet pipe and the first return water circuit through the first three-way valve. The two ends of the second circulating water circuit are connected to the second inlet pipe and the second return water circuit through the second three-way valve. The two ends of the third circulating water circuit are connected to the second inlet pipe and the second return water circuit through the third three-way valve.

[0021] In the cooling + heat recovery fresh air mode, the circulating indoor unit, exhaust indoor unit, and fresh air indoor unit all operate, while the outdoor unit and water module are also activated. The high-temperature, high-pressure refrigerant output from the compressor is first transported to the outdoor heat exchanger through the first four-way valve, where it condenses and releases heat, absorbing cooling capacity from the outdoor environment. The refrigerant output from the outdoor heat exchanger is then transported to the first plate heat exchanger through the second four-way valve. Since the outdoor electronic expansion valve is fully open, the refrigerant entering the first plate heat exchanger continues to condense and release heat in the cooling channel, heating the water in the first circulating water circuit connected to the cooling channel in the first plate heat exchanger. The refrigerant output from the first plate heat exchanger is then throttled by the second expansion valve and transported to the second plate heat exchanger for evaporation and heat absorption, cooling the water flowing through the second plate heat exchanger. Finally, the refrigerant is returned to the compressor.

[0022] The first water pump drives the water in the first circulating water path connected to it to flow. After absorbing heat in the first plate heat exchanger, the water in the first circulating water path is delivered to the exhaust heat exchanger to exchange heat with the sludge air in the output room and absorb the cold air in the sludge air. The second water pump drives the water in the second and third circulating water paths connected to it to flow. After the water in the second and third circulating water paths is cooled, it is delivered to the fresh air heat exchanger and the circulating heat exchanger to cool the fresh air and the circulating air in the room. The circulating fan cools the air circulating in the room; the fresh air fan cools the hot, fresh air from outside and introduces it into the room; the exhaust fan recovers the cooling energy from the stale, cold air in the room and exhausts it outside, ensuring that the air in the room is both fresh and cool in summer.

[0023] In some embodiments of this application, when switching from heating mode to heating + heat recovery fresh air mode, the second expansion valve switches from fully open to throttling state, the second water pump is turned on, and the two ends of the second circulating water circuit are switched to be connected to the first inlet pipe and the first return pipe through the second three-way valve. When the temperature T of the exhaust heat exchanger 排风 Less than the preset exhaust temperature T S排风 And the temperature T of the fresh air heat exchanger 新风 Greater than the preset fresh air temperature T S新风 When the exhaust fan and the fresh air fan are turned on, the controller will turn them on to prevent them from turning on too early, which would cause low-temperature airflow to enter the room and affect the user experience.

[0024] In some embodiments of this application, when switching from cooling mode to cooling + heat recovery fresh air mode, the first water pump is turned on, and the two ends of the second circulating water circuit are switched to be connected to the second inlet water circuit and the second return water circuit through the second three-way valve. When the temperature T of the exhaust heat exchanger 排风 Not less than the preset exhaust temperature T l排风 And the temperature T of the fresh air heat exchanger 新风 No greater than the preset fresh air temperature T l新风 When the exhaust fan and the fresh air fan are turned on, the controller will turn them on to prevent them from turning on too early, which would cause high-temperature airflow to enter the room and affect the user experience.

[0025] Compared with the prior art, the advantages and positive effects of the present invention are: The air conditioning unit involved in this application only requires one system to achieve integrated ventilation, temperature regulation and heat recovery functions, making installation and maintenance simpler and reducing equipment manufacturing costs. The structure of the fresh air indoor unit and the exhaust air indoor unit in the air conditioning unit is the same as that of the circulating indoor unit. While realizing indoor and outdoor air circulation, the fresh air indoor unit and the exhaust air indoor unit can also work with the water module to realize the function of heat recovery. There is no need to develop a separate total heat exchanger product, which is conducive to product versatility.

[0026] Other features and advantages of the present invention will become clearer after reading the detailed embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0027] 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 some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a diagram of an air conditioning unit system according to an embodiment; Figure 2 A schematic diagram of the first four-way valve and the second four-way valve according to an embodiment; Figure 3 This is a schematic diagram of airflow in the internal circulation mode according to an embodiment; Figure 4 This is a schematic diagram of airflow in the fresh air mode according to an embodiment; Figure 5 This is a schematic diagram of refrigerant flow under the heating mode according to an embodiment; Figure 6 This is a schematic diagram of refrigerant flow under the refrigeration mode according to an embodiment; Figure 7 This is a system diagram of an air conditioning unit in the heating + heat recovery fresh air mode according to an embodiment. Figure 8 This is a system diagram of an air conditioning unit in the cooling + heat recovery fresh air mode according to an embodiment; Figure 9 A flowchart showing the process of switching from heating mode to heating + heat recovery fresh air mode; Figure 10 This is a flowchart illustrating the process of switching from cooling mode to cooling + heat recovery fresh air mode. Figure label: 1. Outdoor unit; 2. Water module; 3. Indoor unit; 10. First circulating water circuit; 11. First three-way valve; 20. Second circulating water circuit; 21. Second three-way valve; 30. Third circulating water circuit; 31. Third three-way valve; 40. First water inlet pipe; 41. First water pump; 50. First return water pipeline; 60. Second water inlet pipe; 61. Second water pump; 70. Second return water pipeline; 80. Shut-off valve; 100. Compressor; 110. Gas-liquid separator; 120. First four-way valve; 121. First valve port; 122. Second valve port; 123. Third valve port; 124. Fourth valve port; 130. Second four-way valve; 131. First port; 132. Second port; 133. Third port; 134. Fourth port; 200. Outdoor heat exchanger; 210. Outdoor fan; 220. Outdoor expansion valve; 300. Indoor exhaust unit; 310. Exhaust heat exchanger; 320. Exhaust fan; 330. Waste air inlet duct; 400. Indoor fresh air unit; 410. Fresh air heat exchanger; 420. Fresh air fan; 430. Fresh air output duct; 500. Indoor unit with circulating air; 510. Circulating heat exchanger; 520. Circulating fan; 530. Circulating piping; 600. First plate heat exchanger; 610. First expansion valve; 700, Second plate heat exchanger; 710, Second expansion valve. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0031] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0032] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0035] In this application, the air conditioner performs a refrigeration cycle by using a compressor, condenser, expansion valve, and evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation to cool or heat an indoor space.

[0036] Low-temperature, low-pressure refrigerant enters the compressor, which compresses it into a high-temperature, high-pressure refrigerant gas and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0037] The expansion valve expands the high-temperature, high-pressure liquid refrigerant that condenses in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the expanded refrigerant in the expansion valve and returns the low-temperature, low-pressure refrigerant gas to the compressor. The evaporator achieves its cooling effect by utilizing the latent heat of refrigerant evaporation to exchange heat with the material being cooled. Throughout the cycle, the air conditioner regulates the temperature of the indoor space.

[0038] The outdoor unit of an air conditioner refers to the part of the refrigeration cycle that includes the compressor and the outdoor heat exchanger. The indoor unit of an air conditioner includes the indoor heat exchanger, and an expansion valve can be provided in either the indoor or outdoor unit.

[0039] The indoor and outdoor heat exchangers function as either condensers or evaporators. When the indoor heat exchanger is used as a condenser, the air conditioner functions as a heater in heating mode; when the indoor heat exchanger is used as an evaporator, the air conditioner functions as a cooler in cooling mode.

[0040] refer to Figure 1 The present invention proposes an air conditioning unit, which includes an outdoor unit 1, a water module 2 and an indoor unit 3. The water module 2 is connected to the outdoor unit 1 through a refrigerant pipeline, and the water module 2 is connected to the indoor unit 3 through a circulating water circuit.

[0041] The outdoor unit 1 includes a compressor 100, an outdoor heat exchanger 200, a first four-way valve 120, and a second four-way valve 130, all connected by refrigerant piping.

[0042] The water module 2 includes a first plate heat exchanger 600 and a second plate heat exchanger 700. Both the first plate heat exchanger 600 and the second plate heat exchanger 700 include a refrigeration channel and a cooling channel. One end of the two refrigeration channels is connected through an intermediate pipeline, and the other end is connected to different valve ports of the second four-way valve 130.

[0043] The indoor unit 3 includes a fresh air indoor unit 400, an exhaust indoor unit 300, and at least one circulating indoor unit 500. The number of circulating indoor units 500 is determined according to the actual number of rooms. At least one circulating indoor unit 500 is installed in each room. In other words, when there are multiple rooms, multiple circulating indoor units 500 are installed accordingly. The fresh air indoor unit 400 and the exhaust indoor unit 300 simultaneously exhaust and supply air to multiple rooms.

[0044] The fresh air indoor unit 400 is connected to the outside through the fresh air inlet pipe and to each room through the fresh air outlet pipe 430. In other words, the fresh air indoor unit 400 is connected to each room through the fresh air outlet pipe 430.

[0045] A switch valve is installed in the fresh air output duct 430. When fresh air needs to be introduced into the corresponding room, the switch valve in the corresponding fresh air output duct 430 is opened; otherwise, the switch valve is closed.

[0046] The fresh air indoor unit 400 is configured to draw in fresh air from the outside through the fresh air inlet pipe and deliver the fresh air to the corresponding room through the corresponding fresh air outlet pipe 430.

[0047] The indoor exhaust unit 300 is connected to each room through the waste air inlet pipe 330 and to the outside through the waste air outlet pipe.

[0048] A switch valve is installed in the waste air inlet pipe 330. When waste air needs to be discharged from the corresponding room, the switch valve in the corresponding waste air inlet pipe 330 is opened; otherwise, the switch valve is closed.

[0049] The exhaust indoor unit 300 is configured to output the stale air from the corresponding room through the corresponding stale air inlet pipe 330, and discharge the stale air to the outside through the stale air outlet pipe.

[0050] Among them, the fresh air indoor unit 400, the exhaust indoor unit 300 and the circulation indoor unit 500 are respectively connected to the cooling channel in the first plate heat exchanger 600 or the second plate heat exchanger 700 through the corresponding circulating water circuit.

[0051] Combination Figure 2 In some embodiments of this application, the first valve port 121 of the first four-way valve 120 is connected to the output port of the compressor 100, the second valve port 122 of the first four-way valve 120 is connected to the first port 131 of the second four-way valve 130, the third valve port 123 of the first four-way valve 120 is connected to the input port of the compressor 100, and the fourth valve port 124 of the first four-way valve 120 is connected to one end of the outdoor heat exchanger 200.

[0052] The second port 132 of the second four-way valve 130 is connected to the refrigeration channel of the first plate heat exchanger 600, the third valve port 123 of the second four-way valve 130 is connected to the other end of the outdoor heat exchanger 200, and the fourth valve port 124 of the second four-way valve 130 is connected to the refrigeration channel of the second plate heat exchanger 700.

[0053] An outdoor expansion valve 220 is provided between the outdoor heat exchanger 200 and the third valve port 123. The first plate heat exchanger 600 is connected to the first expansion valve 610, and the second plate heat exchanger 700 is connected to the second expansion valve 710.

[0054] The first valve port 121 is selectively connected to the second valve port 122 or the fourth valve port 124, and the third valve port 123 is selectively connected to the fourth valve port 124 or the second valve port 122 to control the flow path of the high-temperature and high-pressure refrigerant output from the output end of the compressor 100.

[0055] Specifically, during heating, the first valve port 121 is connected to the second valve port 122, the third valve port 123 is connected to the fourth valve port 124, the first port 131 is connected to the second port 132, and the third port 133 is connected to the fourth port 134. The high-temperature and high-pressure refrigerant output from the compressor 100 passes through the first valve port 121, the second valve port 122, the first port 131, and the second port 132, and is then transported to the cooling channel inside the first plate heat exchanger 600 so that the first plate heat exchanger 600 can heat.

[0056] During refrigeration, the first valve port 121 is connected to the fourth valve port 124, the second valve port 122 is connected to the third valve port 123, the first port 131 is connected to the fourth port 134, and the second port 132 is connected to the third port 133. The high-temperature and high-pressure refrigerant output from the compressor 100 is delivered to the outdoor heat exchanger 200 after passing through the first valve port 121 and the fourth valve port 124, and then delivered to the first plate heat exchanger 600 after passing through the third port 133 and the second port 132.

[0057] In some embodiments of this application, the exhaust indoor unit 300 includes an exhaust heat exchanger 310 and an exhaust fan 320. The exhaust heat exchanger 310 is connected to the cooling channel in the first plate heat exchanger 600 or the second plate heat exchanger 700 through the first circulating water channel 10.

[0058] The exhaust fan 320 and the exhaust heat exchanger 310 are connected to the waste air inlet pipe 330. After the exhaust fan 320 is turned on, the waste air in the room is discharged to the outside through the waste air inlet pipe 330 and the waste air outlet pipe.

[0059] The fresh air indoor unit 400 includes a fresh air heat exchanger 410 and a fresh air fan 420. The fresh air heat exchanger 410 is connected to the cooling channel in the first plate heat exchanger 600 or the second plate heat exchanger 700 through the second circulating water channel 20.

[0060] The number of rooms is two or more, and the number of rooms is consistent with the number of fresh air output pipes 430 and waste air input pipes 330 connected to the fresh air indoor unit 400 and the exhaust indoor unit 300. Each fresh air output pipe 430 and waste air input pipe 330 is equipped with a switch valve to control the opening and closing of the corresponding fresh air output pipe 430 and waste air input pipe 330 connected to the room.

[0061] The indoor unit 500 includes a circulating heat exchanger 510 and a circulating fan 520. The circulating heat exchanger 510 is connected to the cooling channel in the first plate heat exchanger 600 or the second plate heat exchanger 700 through the third circulating water channel 30.

[0062] The circulating fan 520 is connected to the room through the circulating pipe 530. After the circulating fan 520 is turned on, the airflow in the room is input from the air inlet of the circulating pipe 530, passes through the circulating heat exchanger 510, and is then returned to the room from the air outlet of the circulating pipe 530.

[0063] A shut-off valve 80 is installed on the first circulating water path 10, the second circulating water path 20, and the third circulating water path 30.

[0064] The shut-off valve 80 is used to control the opening of the first circulating water path 10, the second circulating water path 20 and the third circulating water path 30, and serves the purpose of unidirectional conveying and preventing backflow.

[0065] The exhaust heat exchanger 310, the fresh air heat exchanger 410, and the circulating heat exchanger 510 are selectively connected to the cooling channel in the first plate heat exchanger 600 or the second plate heat exchanger 700, so that the water in the corresponding circulating water circuit exchanges heat with the refrigerant in the cooling channel to achieve the purpose of cooling or heating.

[0066] In some embodiments of this application, the cooling channel of the first plate heat exchanger 600 is connected to a first inlet water pipe 40 and a first return water pipe 50 at both ends, and the cooling channel of the second plate heat exchanger 700 is connected to a second inlet water pipe 60 and a second return water pipe 70 at both ends, respectively. A first water pump 41 is installed on the first inlet water pipe 40, and a second water pump 61 is installed on the second inlet water pipe 60.

[0067] When the first water pump 41 is turned on, the water in the circulating water circuit connected to the first water inlet pipe 40 begins to flow and achieves heat exchange through the first plate heat exchanger 600.

[0068] When the second water pump 61 is turned on, the water in the circulating water circuit connected to the second water inlet pipe 60 begins to flow and achieves heat exchange through the second plate heat exchanger 700.

[0069] One end of the first circulating water circuit 10 is connected to the first inlet pipe 40 or the second inlet pipe 60 through the first three-way valve 11, and the other end of the first circulating water circuit 10 is connected to the first return water circuit 50 or the second return water circuit 70 through the first three-way valve 11.

[0070] One end of the second circulating water circuit 20 is connected to the first inlet water circuit 40 or the second inlet water circuit 60 through the second three-way valve 21, and the other end of the first circulating water circuit 10 is connected to the first return water circuit 50 or the second return water circuit 70 through the second three-way valve 21. One end of each third circulating water path 30 is connected to the first inlet water path 40 or the second inlet water path 60 through the third three-way valve 31, and the other end of the first circulating water path 10 is connected to the first return water path 50 or the second return water path 70 through the third three-way valve 31.

[0071] When the first water pump 41 is turned on, it drives the water flow in the circulating water circuit connected to the first inlet water pipe 40 and the first return water pipe 50, so that the water flow in the corresponding circulating water circuit passes through the cooling channel in the first plate heat exchanger 600 for heat exchange; when the second water pump 61 is turned on, it drives the water flow in the circulating water circuit connected to the second inlet water pipe 60 and the second return water pipe 70, so that the water flow in the corresponding circulating water circuit passes through the cooling channel in the second plate heat exchanger 700 for heat exchange.

[0072] Air conditioning units should include at least the following modes: internal circulation mode, fresh air mode, heating mode, cooling mode, heating + heat recovery fresh air mode, and cooling + heat recovery fresh air mode.

[0073] refer to Figure 3 In some embodiments of this application, in the internal circulation mode, the controller controls the corresponding circulation fan 520 to turn on in order to realize air circulation in the corresponding room.

[0074] In internal circulation mode, outdoor unit 1 and water module 2 do not start, fresh air indoor unit 400 and exhaust indoor unit 300 do not work, and the circulating fan 520 in the circulation indoor unit 500 turns on to circulate indoor air and improve user comfort.

[0075] The internal circulation mode generally does not require temperature adjustment within the room and is mainly designed to improve the flow of space within the room.

[0076] refer to Figure 4 In fresh air mode, the controller turns on the fresh air fan 420 and the exhaust fan 320 to achieve indoor and outdoor air circulation.

[0077] In fresh air mode, outdoor unit 1 and water module 2 do not start, circulating indoor unit 500 does not work, fresh air fan 420 in fresh air indoor unit 400 works, and exhaust fan 320 in exhaust indoor unit 300 works. Fresh air fan 420 introduces fresh air from the outside into the room through fresh air output pipe 430, and exhaust fan 320 exhausts stale air from the room to the outside through stale air input pipe 330, maintaining the freshness of the air in the room and ensuring user comfort.

[0078] The fresh air mode is mainly used in spring and autumn when the temperature difference between indoors and outdoors is small. Its main purpose is to improve indoor air quality by introducing fresh air.

[0079] refer to Figure 5In some embodiments of this application, in heating mode, the controller controls the circulating fan 520 to turn on, the first valve port 121 is connected to the second valve port 122, the third valve port 123 is connected to the fourth valve port 124, the first port 131 is connected to the second port 132, and the third port 133 is connected to the fourth port 134; the first expansion valve 610 and the second expansion valve 710 are fully open, and the first water pump 41 is turned on; the two ends of the corresponding third circulating water circuit 30 are connected to the first inlet water circuit 40 and the first return water circuit 50 through the third three-way valve 31, the two ends of the first circulating water circuit 10 are connected to the second inlet water circuit 60 and the second return water circuit 70 through the first three-way valve 11, and the two ends of the second circulating water circuit 20 are connected to the second inlet water circuit 60 and the second return water circuit 70 through the second three-way valve 21.

[0080] It should be noted that the corresponding third circulating water circuit 30 involved is the third circulating water circuit 30 connected to the corresponding room that needs heating. The circulating water circuit of the other room that does not need heating is connected to the second inlet water circuit 60 and the second return water circuit 70 through the corresponding third three-way valve 31. Alternatively, the shut-off valve 80 corresponding to the room that does not need heating is closed to disconnect the third circulating water circuit 30 connected to it, and the shut-off valves 80 on the other corresponding circulating water circuits that participate in heating are all open.

[0081] In heating mode, the fresh air indoor unit 400 and the exhaust indoor unit 300 are not working, while the outdoor unit 1 and water module 2 are started, and the circulation indoor unit 500 is working. The high-temperature and high-pressure refrigerant output from the compressor 100 first passes through the first four-way valve 120 and the second four-way valve 130 and is then transported to the refrigeration channel in the first plate heat exchanger 600. The refrigerant in the refrigeration channel condenses and releases heat, transferring the heat to the cooling channel in the first plate heat exchanger 600, heating the water in the cooling channel. The first expansion valve 610 and the second expansion valve 710 do not throttle. After the refrigerant passes through the outdoor expansion valve 220, it enters the outdoor heat exchanger 200 to evaporate and absorb heat from the outside. The first water pump 41 drives the water flow in the third circulating water circuit 30, and delivers the heated water to the circulating heat exchanger 510 for heat release, thereby heating the chamber.

[0082] In the heating mode, the high-temperature and high-pressure refrigerant output by the compressor 100 passes through the first four-way valve and the second four-way valve, and is then transported to the first plate heat exchanger 600 via the refrigerant pipeline. After condensing and releasing heat in the first plate heat exchanger 600, it is transported to the second plate heat exchanger 700 via the intermediate pipeline. No heat exchange occurs in the second plate heat exchanger 700. The refrigerant output from the second plate heat exchanger 700 passes through the fourth port 134 and the third port 133, and is then transported to the outdoor heat exchanger 200. After being throttled by the outdoor electronic expansion valve, it is transported to the outdoor heat exchanger 200. After evaporating and absorbing heat in the outdoor heat exchanger 200, it exchanges heat with the outdoor airflow under the action of the outdoor fan 210. After passing through the fourth valve port 124 and the third valve port 123, the refrigerant separated by the gas-liquid separator 110 is transported back to the compressor 100.

[0083] The water in the third circulating water path 30, driven by the first water pump 41, flows through the first inlet water pipe 40 and into the cooling channel of the first plate heat exchanger 600. After absorbing the heat of the refrigerant in the cooling channel, the temperature rises, and then it flows back to the circulating heat exchanger 510 through the first return water pipe 50 to heat the airflow entering the chamber.

[0084] refer to Figure 6 In cooling mode, the controller controls the circulating fan 520 to start, the first valve port 121 and the fourth valve port 124 are connected, the second valve port 122 and the third valve port 123 are connected; the first port 131 is connected to the fourth port 134, and the second port 132 is connected to the third port 133; the outdoor electronic expansion valve and the first expansion valve 610 are fully open; the second water pump 61 is turned on, and the two ends of the corresponding third circulating water circuit 30 are connected to the second inlet water circuit 60 and the second return water circuit 70 through the third three-way valve 31, for connection to the second plate heat exchanger 700; the two ends of the first circulating water circuit 10 are connected to the first inlet water circuit 40 and the first return water circuit 50 through the first three-way valve 11, and the two ends of the second circulating water circuit 20 are connected to the first inlet water circuit 40 and the first return water circuit 50 through the second three-way valve 21.

[0085] Similarly, the third circulating water circuit 30 mentioned above is the third circulating water circuit 30 connected to the corresponding room that needs cooling. The circulating water circuit of the other room that does not need cooling is connected to the first inlet pipe 40 and the first return pipe 50 through the corresponding third three-way valve 31. Alternatively, the shut-off valve 80 of the room that does not need cooling is closed to disconnect the third circulating water circuit 30 connected to it, and the shut-off valves 80 on the other corresponding circulating water circuits that participate in heating are all open.

[0086] During cooling, the fresh air indoor unit 400 and the exhaust indoor unit 300 do not work, while the outdoor unit 1 and the water module 2 are started, and the circulation indoor unit 500 works. The high-temperature and high-pressure refrigerant output from the compressor 100 is first transported to the outdoor heat exchanger 200 through the first four-way valve 120 for condensation and heat release. Then, the refrigerant output from the outdoor heat exchanger 200 is transported to the first plate heat exchanger 600 through the second four-way valve 130. Since the first water pump 41 is not turned on, the refrigerant does not undergo heat exchange in the first plate heat exchanger 600. The refrigerant output from the first plate heat exchanger 600 is throttled by the second expansion valve 710 and then transported to the second plate heat exchanger 700 for evaporation and heat absorption, cooling the water flowing through its cooling channel. The second water pump 61 is turned on, and the third circulating water circuit 30, which is connected to the cooling channel of the second plate heat exchanger 700, delivers the cooled water to the circulating heat exchanger 510 to cool the compartment.

[0087] In the unfolded cooling mode, the high-temperature and high-pressure refrigerant output from the compressor 100 passes through the first valve port 121 and the fourth valve port 124, and is then transported to the outdoor heat exchanger 200 via the refrigerant pipeline. After condensing and releasing heat in the outdoor heat exchanger 200, it is then transported to the first plate heat exchanger 600 through the third port 133 and the second port 132. The refrigerant does not undergo heat exchange in the first plate heat exchanger 600. The refrigerant output from the first plate heat exchanger 600 is throttled by the second expansion valve 710 on the intermediate pipeline and then input into the second plate heat exchanger 700. Finally, it is returned to the compressor 100 after passing through the fourth port 134, the first port 131, the second valve port 122, and the third valve port 123.

[0088] The water in the third circulating water path 30, driven by the second water pump 61, flows through the second inlet water pipe 60 and into the cooling channel of the second plate heat exchanger 700. After absorbing the cold energy of the refrigerant in the cooling channel, the temperature decreases. Then, it flows through the second return water pipe 70 and is returned to the circulating heat exchanger 510 to cool the airflow entering the chamber.

[0089] refer to Figure 7In some embodiments of this application, under the heating + heat recovery fresh air mode, the controller controls the exhaust fan 320, the fresh air fan 420 and the corresponding circulating fan 520 to open. The first valve port 121 is connected to the second valve port 122, the third valve port 123 is connected to the fourth valve port 124, the first port 131 is connected to the second port 132, and the third port 133 is connected to the fourth port 134. The first expansion valve 610 is fully open. The first water pump 41 and the second water pump 61 are turned on. The two ends of the first circulating water path 10 are connected to the second inlet water path 60 and the second return water path 70 through the first three-way valve 11. The two ends of the second circulating water path 20 are connected to the first inlet water path 40 and the first return water path 50 through the second three-way valve 21. The two ends of the third circulating water path 30 are connected to the first inlet water path 40 and the first return water path 50 through the third three-way valve 31.

[0090] The shut-off valves 80 on the first circulating water path 10 and the second circulating water path 20 are open, the shut-off valves 80 on the third circulating water path 30 corresponding to the heating chambers are open, and the shut-off valves 80 on the third circulating water path 30 corresponding to the non-heating chambers are closed.

[0091] In the heating + heat recovery fresh air mode, the circulating indoor unit 500, the exhaust indoor unit 300, and the fresh air indoor unit 400 all operate, while the outdoor unit 1 and the water module 2 are both started. The high-temperature and high-pressure refrigerant output by the compressor 100 is first transported to the refrigeration channel in the first plate heat exchanger 600 through the first four-way valve 120 and the second four-way valve 130. The refrigerant in the refrigeration channel condenses and releases heat, transferring the heat to the cooling channel in the first plate heat exchanger 600 to heat the water in the cooling channel. The refrigerant output from the first plate heat exchanger 600 is throttled by the second expansion valve 710 and then transported to the refrigeration channel in the second plate heat exchanger 700 to cool the water in its cooling channel. The refrigerant output from the second plate heat exchanger 700 evaporates and absorbs heat again through the outdoor electronic expansion valve, absorbing heat from the outdoor environment. Finally, the refrigerant returns to the compressor 100.

[0092] The first water pump 41 drives the water in the second circulating water path 20 and the third circulating water path 30 connected to it to flow. The water in the second circulating water path 20 and the third circulating water path 30 absorbs heat in the first plate heat exchanger 600 and is then delivered to the fresh air heat exchanger 410 and the circulating heat exchanger 510 respectively to heat the fresh air delivered to the room and the airflow in the room. The second water pump 61 drives the water in the first circulating water path 10 connected to it to flow. The water in the first circulating water path 10 is cooled down after being heated by the refrigerant in the second plate heat exchanger 700. The cooled water is then delivered to the exhaust heat exchanger 310 to exchange heat with the airflow discharged from the room and recover the heat from the indoor stale air.

[0093] That is, the circulating fan 520 operates to heat the circulating air in the room; the fresh air fan 420 operates to heat the fresh, low-temperature air from outside the room and introduce it into the room; the exhaust fan 320 operates to recover the heat from the stale, high-temperature air in the room and exhaust it outside the room, ensuring that the air in the room is both fresh and warm in winter.

[0094] refer to Figure 8 In some embodiments of this application, under the cooling + heat recovery fresh air mode, the controller controls the exhaust fan 320, the fresh air fan 420, and the corresponding circulating fan 520 to open. The first valve port 121 and the fourth valve port 124 are connected, and the second valve port 122 and the third valve port 123 are connected. The first port 131 is connected to the fourth port 134, and the second port 132 is connected to the third port 133. The first expansion valve 610 is fully open. The first water pump 41 and the second water pump 61 are turned on. The two ends of the first circulating water path 10 are connected to the first inlet water path 40 and the first return water path 50 through the first three-way valve 11. The two ends of the second circulating water path 20 are connected to the second inlet water path 60 and the second return water path 70 through the second three-way valve 21. The two ends of the third circulating water path 30 are connected to the second inlet water path 60 and the second return water path 70 through the third three-way valve 31.

[0095] In the cooling + heat recovery fresh air mode, the circulating indoor unit 500, the exhaust indoor unit 300, and the fresh air indoor unit 400 all operate. Outdoor unit 1 and water module 2 are both started. The high-temperature, high-pressure refrigerant output from compressor 100 is first transported to the outdoor heat exchanger 200 via the first four-way valve 120, where it condenses and releases heat, absorbing cooling energy from the outdoor environment. The refrigerant output from outdoor heat exchanger 200 is then transported to the first plate heat exchanger 600 via the second four-way valve 130. With the outdoor electronic expansion valve fully open, the refrigerant entering the first plate heat exchanger 600 continues to condense and release heat in the refrigeration channel, heating the water in the first circulating water circuit 10 connected to the cooling channel in the first plate heat exchanger 600. The refrigerant output from the first plate heat exchanger 600 is throttled by the second expansion valve 710 and then transported to the second plate heat exchanger 700 for evaporation and heat absorption, cooling the water flowing through the second plate heat exchanger 700. Finally, the refrigerant is returned to the compressor 100.

[0096] The first water pump 41 drives the water in the first circulating water path 10 connected to it to flow. After absorbing heat in the first plate heat exchanger 600, the water in the first circulating water path 10 is transported to the exhaust heat exchanger 310 to exchange heat with the sludge air in the output room and absorb the cold energy in the sludge air. The second water pump 61 drives the water in the second circulating water path 20 and the third circulating water path 30 connected to it to flow. After the water in the second circulating water path 20 and the third circulating water path 30 is cooled, it is transported to the fresh air heat exchanger 410 and the circulating heat exchanger 510 to cool the fresh air input into the room and the circulating air in the room. The circulating fan operates at 520 to cool the circulating air in the room; the fresh air fan operates at 420 to cool the fresh, hot air from outside and introduce it into the room; the exhaust fan operates at 320 to recover the cooling energy of the stale, cold air in the room and exhaust it outside, ensuring that the air in the room is both fresh and cool in summer.

[0097] The switching process from heating mode to heating + heat recovery fresh air mode and from cooling mode to cooling + heat recovery fresh air mode involves the activation of the plate heat exchanger. If the switching process is not properly controlled, it will cause uncomfortable air outlet temperature. Therefore, the switching process is crucial.

[0098] refer to Figure 9 In some embodiments of this application, when the unit receives a command to switch the heating mode to the heating + heat recovery fresh air mode, the second expansion valve 710 switches from the fully open state to the throttling state, the second water pump 61 is turned on, and the two ends of the second circulating water circuit 20 are switched to be connected to the first inlet water circuit 40 and the first return water circuit 50 through the second three-way valve 21, so that the second circulating water circuit 20 is connected to the first plate heat exchanger 600, and the high-temperature water after heat exchange in the fresh air heat exchanger 410 is circulated; the first circulating water circuit 10 remains connected to the second plate heat exchanger 700. When the second water pump 61 is turned on, the water in the first circulating water circuit 10 is cooled by the second plate heat exchanger 700 and then transported to the exhaust heat exchanger 310 to absorb the heat of the indoor sludge air output from the sludge air inlet pipe 330.

[0099] When the temperature T of the exhaust heat exchanger 310 排风 Less than the preset exhaust temperature T S排风 And the temperature T of the fresh air heat exchanger 410 新风 Greater than the preset fresh air temperature T S新风 At this time, the controller controls the exhaust fan 320 and the fresh air fan 420 to turn on, so as to avoid the exhaust fan 320 and the fresh air fan 420 turning on too early, which would cause low-temperature airflow to enter the room and affect the user experience.

[0100] Among them, the temperature T of the exhaust heat exchanger 310 排风 The temperature of the stale air output from the outlet of the exhaust heat exchanger 310, and the fresh air temperature T. 新风 To measure the temperature of the fresh air output from the output end of the fresh air heat exchanger 410, a temperature detection device is used to detect the outlet air temperature at the corresponding location.

[0101] refer to Figure 10In some embodiments of this application, when switching from cooling mode to cooling + heat recovery fresh air mode, the first water pump 41 is turned on, and the two ends of the second circulating water path 20 are switched to be connected to the second inlet water path 60 and the second return water path 70 through the second three-way valve 21, so that the second circulating water path 20 is connected to the second plate heat exchanger 700. After the water in the second circulating water path 20 is cooled by the second plate heat exchanger 700, it is sent to the fresh air heat exchanger 410 to cool the incoming airflow. At the same time, after the first water pump 41 is turned on, the water in the first circulating water path 10 connected to the first plate heat exchanger 600 is heated. The heated water is sent to the exhaust heat exchanger 310 to absorb the heat of the stale air discharged from the room.

[0102] When the temperature T of the exhaust heat exchanger 310 排风 Not less than the preset exhaust temperature T l排风 And the temperature T of the fresh air heat exchanger 410 新风 No greater than the preset fresh air temperature T l新风 At this time, the controller controls the exhaust fan 320 and the fresh air fan 420 to turn on, so as to avoid the exhaust fan 320 and the fresh air fan 420 turning on too early, which would cause high temperature airflow to enter the room and affect the user experience.

[0103] The air conditioning unit involved in this application only requires one system to achieve integrated ventilation, temperature regulation and heat recovery functions, making installation simpler and cost-effective. The structure of the fresh air indoor unit 400 and the exhaust indoor unit 300 in the air conditioning unit is the same as that of the circulation indoor unit 500. While realizing indoor and outdoor air circulation, the fresh air indoor unit 400 and the exhaust indoor unit 300 can also work with the water module 2 to realize the function of heat recovery. There is no need to develop a separate total heat exchanger product, which is conducive to product versatility.

[0104] Whenever possible, the various aspects and features described and shown in the specification can be applied individually, and these individual aspects can serve as the subject of a divisional application.

[0105] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0106] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An air conditioning unit, comprising: Comprise: Outdoor unit, comprising a compressor, an outdoor heat exchanger, a first four-way valve and a second four-way valve connected by refrigerant pipeline; Water module, comprising a first plate heat exchanger and a second plate heat exchanger, both of which comprise refrigeration channels and cold carrier channels; one end of the two refrigeration channels is connected by an intermediate pipeline, and the other end is connected with different valve ports of the second four-way valve; Indoor unit, comprising fresh air indoor unit, exhaust air indoor unit and at least one circulating indoor unit, the fresh air indoor unit is communicated with the outside through fresh air input pipeline and with each room through fresh air output pipeline, the exhaust air indoor unit is communicated with each room through dirty air input pipeline and with the outside through dirty air output pipeline; Wherein, the fresh air indoor unit, exhaust air indoor unit and circulating indoor unit are respectively communicated with the cold carrier channels in the first plate heat exchanger or the second plate heat exchanger through corresponding circulating waterway.

2. The air conditioning unit of claim 1, wherein the first valve port of the first four-way valve is connected with the output port of the compressor, the second valve port of the first four-way valve is connected with the first port of the second four-way valve, the third valve port of the first four-way valve is connected with the input port of the compressor, and the fourth valve port of the first four-way valve is connected with one end of the outdoor heat exchanger; the second port of the second four-way valve is connected with the refrigeration channel of the first plate heat exchanger, the third port of the second four-way valve is connected with the other end of the outdoor heat exchanger, the fourth port of the second four-way valve is connected with the refrigeration channel of the second plate heat exchanger, and an outdoor expansion valve is arranged between the outdoor heat exchanger and the third valve port, the first plate heat exchanger is connected with a first expansion valve, and the second plate heat exchanger is connected with a second expansion valve.

3. The air conditioning unit of claim 2, wherein the exhaust air indoor unit comprises an exhaust air heat exchanger and an exhaust air fan, and the exhaust air heat exchanger is communicated with the cold carrier channels in the first plate heat exchanger or the second plate heat exchanger through a first circulating waterway; the fresh air indoor unit comprises a fresh air heat exchanger and a fresh air fan, and the fresh air heat exchanger is communicated with the cold carrier channels in the first plate heat exchanger or the second plate heat exchanger through a second circulating waterway; the circulating indoor unit comprises a circulating heat exchanger and a circulating fan, and the circulating heat exchanger is communicated with the cold carrier channels in the first plate heat exchanger or the second plate heat exchanger through a third circulating waterway; a stop valve is arranged on each of the first circulating waterway, the second circulating waterway and the third circulating waterway.

4. The air conditioning unit of claim 3, wherein the two ends of the cold carrier channel of the first plate heat exchanger are respectively connected with a first water inlet pipeline and a first water return pipeline, the two ends of the cold carrier channel of the second plate heat exchanger are respectively connected with a second water inlet pipeline and a second water return pipeline, a first water pump is arranged on the first water inlet pipeline, and a second water pump is arranged on the second water inlet pipeline. One end of the first circulating water circuit is communicated with the first water inlet pipeline or the second water inlet pipeline through a first three-way valve, and the other end of the first circulating water circuit is communicated with the first water return pipeline or the second water return pipeline through the first three-way valve; One end of the second circulating water circuit is communicated with the first water inlet pipeline or the second water inlet pipeline through a second three-way valve, and the other end of the first circulating water circuit is communicated with the first water return pipeline or the second water return pipeline through the second three-way valve; One end of each of the third circulating water circuits is communicated with the first water inlet pipeline or the second water inlet pipeline through a third three-way valve, and the other end of the first circulating water circuit is communicated with the first water return pipeline or the second water return pipeline through the third three-way valve.

5. The air conditioning unit according to claim 1, wherein in the internal circulation mode, the controller controls the corresponding circulating fan to be turned on, so as to realize air circulation in the corresponding chamber; in the fresh air mode, the controller controls the fresh air fan and the exhaust air fan to be turned on, so as to realize air circulation between the indoor and outdoor.

6. The air conditioning unit according to claim 4, wherein in the heating mode, the controller controls the circulating fan to be turned on, the first valve port is communicated with the second valve port, the third valve port is communicated with the fourth valve port, the first port is communicated with the second port, and the third port is communicated with the fourth port; the first expansion valve and the second expansion valve are fully opened, and the first water pump is turned on; the two ends of the corresponding third circulating water circuit are communicated with the first water inlet pipeline and the first water return pipeline through the third three-way valve, the two ends of the first circulating water circuit are communicated with the second water inlet pipeline and the second water return pipeline through the first three-way valve, and the two ends of the second circulating water circuit are communicated with the second water inlet pipeline and the second water return pipeline through the second three-way valve; in the cooling mode, the controller controls the circulating fan to be turned on, the first valve port is communicated with the fourth valve port, and the second valve port is communicated with the third valve port; the first port is communicated with the fourth port, and the second port is communicated with the third port; the outdoor electronic expansion valve and the first expansion valve are fully opened, the second water pump is turned on, the two ends of the corresponding third circulating water circuit are communicated with the second water inlet pipeline and the second water return pipeline through the third three-way valve, the two ends of the first circulating water circuit are communicated with the first water inlet pipeline and the first water return pipeline through the first three-way valve, and the two ends of the second circulating water circuit are communicated with the first water inlet pipeline and the first water return pipeline through the second three-way valve.

7. The air conditioning unit according to claim 6, wherein ​ ​ In the heating and heat recovery fresh air mode, the controller controls the exhaust fan, the fresh air fan and the corresponding circulating fan to be turned on, the first valve port and the second valve port are communicated, the third valve port and the fourth valve port are communicated, the first port and the second port are communicated, and the third port and the fourth port are communicated; the first expansion valve is fully opened, the outdoor electronic expansion valve and the second expansion valve are opened at a preset opening degree; the first water pump and the second water pump are turned on, the two ends of the first circulating water circuit are communicated with the second water inlet pipeline and the second water return pipeline through the first three-way valve, the two ends of the second circulating water circuit are communicated with the first water inlet pipeline and the first water return pipeline through the second three-way valve, and the two ends of the third circulating water circuit are communicated with the first water inlet pipeline and the first water return pipeline through the third three-way valve.

8. The air conditioning unit of claim 6, wherein, In the cooling and heat recovery fresh air mode, the controller controls the exhaust fan, the fresh air fan and the corresponding circulating fan to be turned on, the first valve port and the fourth valve port are communicated, the second valve port and the third valve port are communicated; the first port and the fourth port are communicated, and the second port and the third port are communicated; the first expansion valve and the outdoor electronic expansion valve are fully opened, and the second expansion valve is opened at a preset opening degree; the first water pump and the second water pump are turned on, the two ends of the first circulating water circuit are communicated with the first water inlet pipeline and the first water return pipeline through the first three-way valve, the two ends of the second circulating water circuit are communicated with the second water inlet pipeline and the second water return pipeline through the second three-way valve, and the two ends of the third circulating water circuit are communicated with the second water inlet pipeline and the second water return pipeline through the third three-way valve.

9. The air conditioning unit of claim 7, wherein, When switching from the heating mode to the heating and heat recovery fresh air mode, the second expansion valve is switched from the fully open state to the throttling state, the second water pump is turned on, and the two ends of the second circulating water circuit are switched to be communicated with the first water inlet pipeline and the first water return pipeline through the second three-way valve; When the temperature T 排风 of the exhaust air heat exchanger is less than a preset exhaust air temperature T S排风 , and the temperature T 新风 of the fresh air heat exchanger is greater than a preset fresh air temperature T S新风 , the controller controls the exhaust air fan and the fresh air fan to be turned on.

10. The air conditioning unit of claim 8, wherein, When switching from the cooling mode to the cooling and heat recovery fresh air mode, the first water pump is turned on, and the two ends of the second circulating water circuit are switched to be communicated with the second water inlet pipeline and the second water return pipeline through the second three-way valve; When the temperature T 排风 of the exhaust air heat exchanger is not less than a preset exhaust air temperature T l排风 , and the temperature T 新风 of the fresh air heat exchanger is not greater than a preset fresh air temperature T l新风 , the controller controls the exhaust air fan and the fresh air fan to be turned on.

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