Humidifying multi-split air conditioner

Abstract

A humidifying multi-split air conditioner comprises a plurality of indoor units. The indoor unit comprises a first channel, a second channel, a first fan and a second fan. When the indoor unit is in the first state, the first draught fan rotates in the first direction, and fresh air flows indoors through the first channel. The second fan rotates in the second direction, so that return air flows outdoors through the second channel. When the indoor unit is in the second state, the first fan rotates in the second direction, so that the return air flows outdoors through the first channel; and the second fan rotates in the first direction, so that the fresh air flows into a room through the second channel.

Description

Humidity control multi-split

[0001] This application claims priority to Chinese patent application No. 202310560128.2 filed on May 17, 2023, priority to Chinese patent application No. 202310556940.8 filed on May 17, 2023, and priority to Chinese patent application No. 202310556950.1 filed on May 17, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present disclosure relates to the technical field of air conditioning, and in particular to a humidity-controlled multi-split air conditioner. Background Art

[0003] With the advancement of science and technology and the improvement of people's living standards, fresh air humidifiers have gradually entered people's lives and become commonly used items in people's work and life.

[0004] Fresh air humidifiers primarily regulate indoor air humidity by introducing conditioned fresh air. When dehumidifying fresh air, the evaporator cools the air and absorbs moisture from it through an adsorbent. Under preset conditions, the evaporator switches to a condenser, heating the return air through the condenser and drying out the moisture in the adsorbent.

[0005] Summary of the Invention

[0006] A humidity-controlled multi-split unit is provided, comprising multiple indoor units. Each of the multiple indoor units is configured to switch between a first state and a second state, and comprises a first channel, a second channel, a first fan, a second fan, a first heat exchanger, a second heat exchanger, and multiple adsorbents. The first channel connects the indoor and outdoor spaces. The second channel connects the indoor and outdoor spaces. The first fan is disposed in the first channel. The second fan is disposed in the second channel. The first heat exchanger is disposed in the first channel. The second heat exchanger is disposed in the second channel and connected to the first heat exchanger. The multiple adsorbents are disposed on the surfaces of the first and second heat exchangers and are configured to absorb moisture from the passing air or release stored moisture to the passing air. When the indoor unit is in the first state, the first fan rotates in a first direction, causing fresh air to flow into the room through the first channel. The fresh air exchanges heat with the first heat exchanger in the first channel, causing the adsorbents on the surfaces of the first heat exchanger to absorb moisture from the fresh air or release stored moisture to the fresh air. The second fan rotates in the second direction, causing return air to flow outdoors through the second channel. The return air exchanges heat with the second heat exchanger in the second channel, causing the adsorbents on the surface of the second heat exchanger to release stored moisture to the return air or absorb moisture from the return air. When the indoor unit is in the second state, the first fan rotates in the second direction, causing return air to flow outdoors through the first channel. The return air exchanges heat with the first heat exchanger in the first channel, causing the adsorbents on the surface of the first heat exchanger to release stored moisture to the return air or absorb moisture from the return air. The second fan rotates in the first direction, causing fresh air to flow indoors through the second channel. The fresh air exchanges heat with the second heat exchanger in the second channel, causing the adsorbents on the surface of the second heat exchanger to absorb moisture from the fresh air or release stored moisture from the fresh air. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] FIG1A is a structural diagram of a humidity control multi-split system according to some embodiments;

[0008] FIG1B is a block diagram of a humidity control multi-split system according to some embodiments;

[0009] FIG2 is a structural diagram of an indoor unit of a humidity-controlled multi-split system according to some embodiments;

[0010] FIG3 is a structural diagram of an indoor unit of a humidity-controlled multi-split system in a first state according to some embodiments;

[0011] FIG4 is a structural diagram of an indoor unit of a humidity-controlled multi-split system in a second state according to some embodiments;

[0012] FIG5 is a structural diagram of another humidity control multi-split system according to some embodiments;

[0013] FIG6 is a structural diagram of another humidity control multi-split system according to some embodiments;

[0014] FIG7 is a structural diagram of another humidity-control multi-split system according to some embodiments (the indoor unit is in the first state);

[0015] FIG8 is a structural diagram of another humidity-control multi-split system according to some embodiments (the indoor unit is in the second state);

[0016] FIG9 is a structural diagram of another humidity-control multi-split system according to some embodiments (the indoor unit is in the first state);

[0017] FIG10 is a structural diagram of another humidity-controlled multi-split system according to some embodiments (the indoor unit is in the second state);

[0018] FIG11 is a timing diagram of another humidity control multi-split system operating in a first mode according to some embodiments;

[0019] FIG12 is a timing diagram of another humidity control multi-split system operating in the second mode according to some embodiments;

[0020] FIG13 is a structural diagram of another humidity-control multi-split system according to some embodiments (the indoor unit is in the first state);

[0021] FIG14 is a structural diagram of another humidity-control multi-split system according to some embodiments (the indoor unit is in the second state). DETAILED DESCRIPTION

[0022] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in some embodiments of the present disclosure. Obviously, the embodiments described are only some embodiments of the present disclosure, not all embodiments. Based on the embodiments provided by the present disclosure, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of the present disclosure.

[0023] Unless the context requires otherwise, throughout the specification and claims, the term "comprise" and its other forms, such as the third person singular form "comprises" and the present participle form "comprising", are to be interpreted as open and inclusive, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "example", "specific example" or "some examples" are intended to indicate that the particular features, structures, materials or characteristics associated with the embodiment or example are included in at least one embodiment or example of the present disclosure. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the particular features, structures, materials or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0024] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise specified, "plurality" means two or more.

[0025] When describing some embodiments, the word "connected" and its derivatives may be used. The term "connected" should be understood in a broad sense. For example, "connected" can mean fixed connection, detachable connection, or integration; it can be directly connected or indirectly connected through an intermediate medium.

[0026] “At least one of A, B and C” has the same meaning as “at least one of A, B or C” and both include the following combinations of A, B and C: A only, B only, C only, the combination of A and B, the combination of A and C, the combination of B and C, and the combination of A, B and C.

[0027] “A and / or B” includes the following three combinations: A only, B only, and a combination of A and B.

[0028] The use of "adapted to" or "configured to" herein is intended to be open and inclusive language that does not exclude devices adapted or configured to perform additional tasks or steps.

[0029] As used herein, "about," "substantially," or "approximately" includes the stated value and an average value that is within an acceptable range of deviation from the particular value as determined by one of ordinary skill in the art taking into account the measurements in question and the errors associated with the measurement of the particular quantity (i.e., the limitations of the measurement system).

[0030] As used herein, "parallel", "perpendicular", and "equal" include the situations described and situations similar to the situations described, and the range of the similar situations is within an acceptable deviation range, wherein the acceptable deviation range is as determined by a person of ordinary skill in the art taking into account the measurement in question and the errors associated with the measurement of the specific quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, wherein the acceptable deviation range of approximate parallelism can be, for example, a deviation within 5°; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, wherein the acceptable deviation range of approximate perpendicularity can also be, for example, a deviation within 5°. "Equal" includes absolute equality and approximate equality, wherein the acceptable deviation range of approximate equality can be, for example, that the difference between the two equals is less than or equal to 5% of either one.

[0031] With the advancement of science and technology and the improvement of people's living standards, fresh air humidifiers have gradually entered people's lives and become commonly used items in people's work and life.

[0032] Fresh air humidifiers regulate indoor air humidity by introducing humidified fresh air. The dehumidification and humidification principles of fresh air humidifiers vary depending on the season.

[0033] For example, during summer dehumidification, the fresh air humidifier cools the fresh air through the evaporator. This allows moisture carried by the fresh air to precipitate and be adsorbed on the adsorption element, thereby reducing the humidity of the fresh air. Under the first preset condition, the evaporator switches to condenser mode, changing the wind direction. The return air in the room is heated by the condenser, which then dries out the moisture in the adsorption element and removes it.

[0034] For example, during winter humidification, the return air from the room passes through the evaporator to cool it down, causing moisture carried by the return air to be extracted and adsorbed onto the adsorbent. Under the second preset condition, the wind direction changes, and the evaporator switches to a condenser. The fresh air passes through the condenser to heat up, drying out the moisture from the adsorbent material and delivering it to the room, thereby increasing the humidity of the fresh air.

[0035] Typically, when a fresh air humidifier realizes the above functions, two air valve switching devices need to be set in the air channel to change the wind direction. However, the air valve switching devices have a complex structure, a large size and a high cost.

[0036] To address the aforementioned technical issues, some embodiments of the present disclosure provide a multi-split humidity control system 1000 (a fresh air multi-split humidity control system). This multi-split humidity control system 1000 can achieve the aforementioned functions by switching the airflow direction of the fan. This eliminates the need for a damper switching device within the multi-split humidity control system 1000, simplifying its structure and reducing its size and manufacturing cost.

[0037] In some embodiments, as shown in FIG1A , a humidity control multi-split unit 1000 includes a plurality of indoor units 100 (humidity control indoor units). The plurality of indoor units 100 are connected to a refrigerant circuit of the humidity control multi-split unit 1000 .

[0038] In some embodiments, as shown in FIG2 , the indoor unit 100 includes a housing 1 , which is substantially in the shape of a rectangular parallelepiped.

[0039] In some embodiments, the housing 1 includes a first air vent 11 (a first outdoor air vent) formed in a first side wall of the housing 1 and connected to the outside of the house through a pipeline.

[0040] In some embodiments, the housing 1 further includes a second air vent 12 (second outdoor air vent). The second air vent 12 is formed in the first side wall of the housing 1 and is located on one side of the first air vent 11. The second air vent 12 is connected to the outside of the house through a pipeline.

[0041] For example, when the first air outlet 11 is used as the inlet of fresh air, the second air outlet 12 can be used as the outlet of return air. When the first air outlet 11 is used as the outlet of return air, the second air outlet 12 can be used as the inlet of fresh air.

[0042] In some embodiments, the housing 1 further includes a third air vent 13 (first indoor air vent). The third air vent 13 is formed in the second side wall of the housing 1 and is connected to the indoor room through a pipeline. For example, the second side wall is arranged opposite to the first side wall.

[0043] In some embodiments, the housing 1 further includes a fourth air vent 14 (second indoor air vent). The fourth air vent 14 is formed in the second side wall of the housing 1 and is located on one side of the third air vent 13. The fourth air vent 14 is connected to the outside of the room through a pipeline.

[0044] For example, when the third air outlet 13 is used as the outlet of fresh air, the fourth air outlet 14 can be used as the inlet of return air. When the third air outlet 13 is used as the inlet of return air, the fourth air outlet 14 can be used as the outlet of fresh air.

[0045] In some embodiments, the indoor unit 100 further includes a partition 15. The partition 15 is disposed within the housing 1. The partition 15 and the housing 1 together define a plurality of channels. The channels are configured to transmit airflow.

[0046] In some embodiments, the plurality of channels include a first channel 16 (first air duct), and the first air outlet 11 and the third air outlet 13 are respectively connected to both ends of the first channel 16. For example, the first air outlet 11 is connected to the third air outlet 13 to form the first channel 16.

[0047] In some embodiments, the plurality of channels further includes a second channel 17 (second air duct), and the second air outlet 12 and the fourth air outlet 14 are respectively connected to both ends of the second channel 17. For example, the second air outlet 12 and the fourth air outlet 14 are connected to form the second channel 17.

[0048] In some embodiments, the indoor unit 100 further includes a first fan 21. The first fan 21 is disposed in the first duct 16 and is configured to rotate in a first direction so that outdoor fresh air enters the first duct 16 from the first air outlet 11 and is delivered indoors through the third air outlet 13, or to rotate in a second direction so that indoor return air enters the first duct 16 from the third air outlet 13 and is discharged outdoors through the first air outlet 11. For example, the first direction is opposite to the second direction.

[0049] In some embodiments, the indoor unit 100 also includes a second fan 22, which is disposed in the second channel 17 and is configured to rotate in the second direction so that the indoor return air enters the second channel 17 from the fourth air outlet 14 and is discharged to the outside through the second air outlet 12, or to rotate in the first direction so that the outdoor fresh air enters the second channel 17 from the second air outlet 12 and is sent to the room through the fourth air outlet 14.

[0050] In the following embodiment, as shown in FIG3 and FIG4 , the indoor unit 100 is configured to switch between a first state and a second state.

[0051] Referring to Figure 3, when the indoor unit 100 is in the first state, the first fan 21 rotates in the first direction, the outdoor fresh air enters the first channel 16 from the first air outlet 11, and is sent to the room through the third air outlet 13; the second fan 22 rotates in the second direction, the indoor return air enters the second channel 17 from the fourth air outlet 14, and is discharged to the outside through the second air outlet 12.

[0052] In this case, the first fan 21 is used as a fresh air fan, and the first passage 16 is used as a fresh air passage; the second fan 22 is used as an exhaust fan, and the second passage 17 is used as a return air passage.

[0053] Referring to Figure 4, when the indoor unit 100 is in the second state, the first fan 21 rotates in the second direction, the indoor return air enters the first channel 16 from the third air outlet 13, and is discharged to the outside through the first air outlet 11; the second fan 22 rotates in the first direction, the outdoor fresh air enters the second channel 17 from the second air outlet 12, and is sent to the room through the fourth air outlet 14.

[0054] In this case, the first fan 21 is used as an exhaust fan, and the first passage 16 is used as a return air passage; the second fan 22 is used as a supply air fan, and the second passage 17 is used as a fresh air passage.

[0055] It can be understood that the indoor unit 100 provided in some embodiments of the present disclosure realizes the switching of the fresh air channel and the return air channel by switching the rotation direction of the fan, thereby omitting the air valve switching device, simplifying the structure of the indoor unit 100, and reducing the volume and cost of the indoor unit 100.

[0056] In some embodiments, as shown in Figures 2 to 4, the indoor unit 100 further includes a first heat exchanger 5. The first heat exchanger 5 is disposed in the first passage 16. The indoor unit 100 further includes a second heat exchanger 6. The second heat exchanger 6 is disposed in the second passage 17. When the first heat exchanger 5 functions as an evaporator, the second heat exchanger 6 functions as a condenser. When the first heat exchanger 5 functions as a condenser, the second heat exchanger 6 functions as an evaporator.

[0057] In some embodiments, the indoor unit 100 further includes a plurality of adsorbents. The plurality of adsorbents are disposed on the surfaces of the first heat exchanger 5 and the second heat exchanger 6 and are configured to adsorb moisture from the air passing therethrough. For example, the adsorbents are made of an adsorbent material (e.g., sponge).

[0058] It is understood that the evaporator can cool the air flowing through it, causing water in the air to be analyzed and adsorbed in the adsorbent, thereby reducing the humidity of the air. The condenser can heat the adsorbent, causing water to evaporate from the adsorbent and enter the air flowing through it, thereby increasing the humidity of the air.

[0059] In some embodiments, a straight line parallel to the height direction of the housing 1 and located at the center of the housing 1 is defined as the central axis of the housing 1. The first channel 16 and the second channel 17 are centrally symmetrical with respect to the central axis of the housing 1, and the first channel 16 and the second channel 17 have the same structure.

[0060] It is understandable that since the first channel 16 and the second channel 17 need to periodically switch to serve as either the fresh air channel or the exhaust air channel, by arranging the first channel 16 and the second channel 17 to be centrally symmetrical with respect to the central axis of the housing 1 and having the same structure as the first channel 16 and the second channel 17, cross-flow of air can be avoided, thereby improving the operating efficiency of the indoor unit and reducing energy consumption.

[0061] In some embodiments, the indoor unit 100 further includes a first filter element 3 (first filter screen), which is located in the first channel 16 and is configured to filter and purify the air flowing through the first channel.

[0062] In some embodiments, the indoor unit 100 further includes a second filter element 4 (second filter screen), which is located in the second channel 17 and is configured to filter and purify the air flowing through the second channel.

[0063] 1A , the plurality of indoor units 100 include a first indoor unit 101, a second indoor unit 102, and a third indoor unit 103. The first indoor unit 101, the second indoor unit 102, and the third indoor unit 103 are connected to a refrigerant circuit of a humidity control multi-split unit 1000.

[0064] In some embodiments, the humidity control multi-split unit 1000 further includes a four-way valve 8. The four-way valve 8 has a first port D, a second port C, a third port S, and a fourth port E. The four-way valve 8 is configured to switch between a first switching state and a second switching state to change the flow direction of the refrigerant in the refrigerant circuit. For example, when the four-way valve 8 is in the first switching state, the first port D is connected to the fourth port E, and the second port C is connected to the third port S. When the four-way valve 8 is in the second switching state, the first port D is connected to the second port C, and the third port S is connected to the fourth port E.

[0065] The humidity control multi-split unit 1000 also includes at least one expansion valve 9 (electronic expansion valve). For example, the at least one expansion valve 9 includes a single expansion valve 9. The expansion valve 9 is connected to the refrigerant circuit of the humidity control multi-split unit 1000 and is configured to regulate the flow rate of the refrigerant flowing therethrough. For example, the expansion valve 9 can be an electronic expansion valve, etc.

[0066] The three first heat exchangers 5 in the first indoor unit 101, the second indoor unit 102 and the third indoor unit 103 are connected in parallel between the first end of the expansion valve 9 and the fourth port E of the four-way valve 8, and the three second heat exchangers 6 in the first indoor unit 101, the second indoor unit 102 and the third indoor unit 103 are connected in parallel between the second end of the expansion valve 9 and the second port C of the four-way valve 8.

[0067] In some embodiments, the humidity control multi-split unit 1000 further includes a compressor 7. The exhaust port of the compressor 7 is connected to the first port D of the four-way valve 8, and the intake port of the compressor 7 is connected to the third port S of the four-way valve 8.

[0068] In some embodiments, referring to FIG. 5 , the at least one expansion valve 9 includes three expansion valves 9 (i.e., a first expansion valve 91, a second expansion valve 92, and a third expansion valve 93). The three expansion valves 9 correspond to three indoor units 100, respectively. Each of the three expansion valves 9 is connected in series between the first heat exchanger 5 and the second heat exchanger 6 in the corresponding indoor unit 100 to form a heat exchange branch. The expansion valve 9 is configured to regulate the refrigerant flow in the corresponding heat exchange branch.

[0069] In this case, the exhaust port of the compressor 7 is connected to the first port D of the four-way valve 8, and the intake port of the compressor 7 is connected to the third port S of the four-way valve 8. Three heat exchange branches are connected in parallel between the second port C and the fourth port E of the four-way valve 8.

[0070] 6 , the humidity control multi-split unit 1000 includes three four-way valves 8 . The three four-way valves 8 correspond to the three indoor units 100 and are respectively a first four-way valve 81 , a second four-way valve 82 , and a third four-way valve 83 .

[0071] The exhaust port of the compressor 7 is connected to the first port D of the first four-way valve 81 , the second four-way valve 82 and the third four-way valve 83 , and the intake port of the compressor 7 is connected to the third port S of the first four-way valve 81 , the second four-way valve 82 and the third four-way valve 83 .

[0072] The fourth port E of the first four-way valve 81 is connected in series with the first heat exchanger 5 of the first indoor unit 101, the first expansion valve 91, the second heat exchanger 6 of the first indoor unit 101, and the second port C of the first four-way valve 81.

[0073] The fourth port E of the second four-way valve 82 is connected in series in sequence to the first heat exchanger 5 of the second indoor unit 102 , the second expansion valve 92 , the second heat exchanger 6 of the second indoor unit 102 , and the second port C of the second four-way valve 82 .

[0074] The fourth port E of the third four-way valve 83 is connected in series in sequence to the first heat exchanger 5 of the third indoor unit 103 , the third expansion valve 93 , the second heat exchanger 6 of the third indoor unit 103 , and the second port C of the third four-way valve 83 .

[0075] It can be understood that by setting three four-way valves corresponding to three indoor units, the states of multiple indoor units can be made relatively independent. In this way, the indoor units can control the fan to reverse according to actual conditions, which is conducive to improving the flexibility of dehumidification or humidification of the humidity-regulating multi-split unit 1000.

[0076] In some embodiments, the humidity control multi-split unit 1000 further includes an outdoor unit. The compressor 7 and three four-way valves 8 are disposed in the outdoor unit. This allows the outdoor unit to be installed in an equipment room, thereby preventing the noise generated by the switching of the four-way valves 8 from affecting users.

[0077] In some embodiments, the outdoor unit includes a third heat exchanger 10 (outdoor heat exchanger) connected in series between the exhaust port of the compressor 7 and the first port D of the four-way valve 8 .

[0078] It is understandable that when the outdoor temperature is high, the condenser in the indoor unit may not be sufficient to reduce the high-temperature air to the required temperature, which in turn leads to a high evaporation temperature of the indoor unit and reduced dehumidification performance. Therefore, by connecting the third heat exchanger 10 in series between the exhaust port of the compressor 7 and the four-way valve 8, the cooling capacity of the humidity-regulating multi-split unit 1000 can be improved.

[0079] In some embodiments, as shown in FIG6 , the humidity control multi-split unit 1000 further includes a first solenoid valve 200 , which is connected in series between the exhaust port of the compressor 7 and the first port D of the four-way valve 8 .

[0080] In some embodiments, the humidity control multi-split unit 1000 further includes a one-way valve 600. The humidity control multi-split unit 1000 further includes a reversing valve 80. For example, the reversing valve 80 is a four-way valve and is configured to switch between a first switching state (open state) and a second switching state (closed state). The first port D of the reversing valve 80 is connected to the exhaust port of the compressor 7. The second port C of the reversing valve 80 is connected in series with the third heat exchanger 10, the one-way valve 600, and the first port D of the four-way valve 8. The third port S of the reversing valve 80 is connected to the intake port of the compressor 7. The fourth port E of the reversing valve 80 is blocked.

[0081] In some embodiments, the humidity control multi-split unit 1000 further includes a second solenoid valve 500. The third port S of the four-way valve 8 is connected in series with the second solenoid valve 500 and then connected to the space between the third heat exchanger 10 and the one-way valve 600. For example, a first end of the second solenoid valve is connected to the multiple four-way valves, and a second end of the second solenoid valve is connected to the third heat exchanger and the one-way valve.

[0082] In some embodiments, the humidity control multi-split unit 1000 further includes a third solenoid valve 400. The third port S of the four-way valve 8 is serially connected to the third solenoid valve 400 and the suction port of the compressor 7.

[0083] For example, the first solenoid valve, the second solenoid valve, and the third solenoid valve are configured to open or close a flow path of the refrigerant.

[0084] In some embodiments, the reversing valve 80 is a three-way valve, a first port of which is connected to the third heat exchanger 10 , a second port of which is connected to the exhaust port of the compressor 7 , and a third port of which is connected to the intake port of the compressor 7 .

[0085] When the second port and the first port of the three-way valve are connected, the refrigerant flows from the exhaust port of the compressor 7 to the third heat exchanger 10, and the third heat exchanger 10 acts as a condenser. When the first port and the third port of the three-way valve are connected, the refrigerant flows from the third heat exchanger to the suction port of the compressor 7, and the third heat exchanger 10 acts as an evaporator.

[0086] In some embodiments, the reversing valve 80 includes two solenoid valves: one solenoid valve is connected between the exhaust port of the compressor 7 and the third heat exchanger 10 , and the other solenoid valve is connected between the third heat exchanger 10 and the suction port of the compressor 7 .

[0087] In some embodiments, the humidity control multi-split unit 1000 is configured to operate in a first mode (summer dehumidification mode) to dehumidify the indoor air.

[0088] 3 and 7 , when the humidity-control multi-split unit 1000 operates in the first mode and the indoor unit 100 is in the first state, the first heat exchanger 5 is used as an evaporator and the second heat exchanger 6 is used as a condenser; the first fan 21 rotates in the first direction and is used as a supply fan; the second fan 22 rotates in the second direction and is used as an exhaust fan.

[0089] In this case, fresh air enters the first passage 16 through the first air outlet 11. Driven by the first fan 21, it is filtered by the first filter element 3 and then undergoes heat exchange with the first heat exchanger 5, thereby reducing its temperature and cooling. During the cooling process, moisture in the fresh air is adsorbed by the adsorbent on the surface of the first heat exchanger 5, thereby reducing the humidity of the fresh air. The fresh air with reduced humidity then enters the room through the third air outlet 13.

[0090] In addition, indoor return air enters the second passage 17 through the fourth air outlet 14. Driven by the second fan 22, it exchanges heat with the second heat exchanger 6 to increase its temperature and remove moisture from the adsorbent. The moisture-laden return air is then filtered by the second filter element 4 before being discharged outdoors through the second air outlet 12.

[0091] In some embodiments, when the humidity control multi-split unit 1000 operates in the first mode, the indoor unit 100 is in the first state, and the dehumidification load of the indoor unit is less than or equal to a preset load value, the third heat exchanger 10 does not operate.

[0092] In this case, the first solenoid valve 200 and the third solenoid valve 400 are open, and the second solenoid valve 500 is closed. The reversing valve 80 is in the first switching state (i.e., the first port D is connected to the fourth port E, and the second port C is connected to the third port S). The exhaust port of the compressor 7 is not connected to the third heat exchanger 10. It should be noted that the preset load value is determined based on the actual operating conditions of the humidity control multi-split unit 1000 and is not limited in this disclosure.

[0093] The following describes the circulation of the refrigerant when the dehumidification load of the indoor unit is less than or equal to a preset load value.

[0094] Referring to Figure 6 , the exhaust port of compressor 7 delivers high-temperature, high-pressure refrigerant to first solenoid valve 200 , where it is then diverted to three four-way valves 8 . At this point, at least one of the three four-way valves 8 is in the second switching state. The refrigerant then flows through the three four-way valves 8 to the three indoor units 100 , with the refrigerant flow rates controlled by first expansion valve 91 , second expansion valve 92 , and third expansion valve 93 , respectively.

[0095] In the indoor unit 100, the refrigerant flows through the second heat exchanger 6 to exchange heat with the return air flowing through it, transforming into a low-temperature, high-pressure, two-phase refrigerant. This low-temperature, high-pressure, two-phase refrigerant then flows to the expansion valve 9, where it is throttled and reduced in pressure, transforming into a low-temperature, low-pressure liquid refrigerant. The low-temperature, low-pressure liquid refrigerant then flows to the first heat exchanger 5, where it absorbs heat from the fresh air flowing through it, transforming into a low-temperature, low-pressure gaseous refrigerant. Finally, the low-temperature, low-pressure gaseous refrigerant flows through the corresponding fourth port E and third port S of the four-way valve 8, flows to the third solenoid valve 400, and returns to the compressor 7, completing one refrigerant cycle.

[0096] In some embodiments, when the humidity control multi-split unit 1000 operates in the first mode, the indoor unit 100 is in the first state, and the dehumidification load of the indoor unit is greater than a preset load value, the third heat exchanger 10 operates.

[0097] In this state, the first and second solenoid valves 200 and 500 are closed, and the third solenoid valve 400 is open. The reversing valve 80 is in the second switching state (i.e., the first port D of the reversing valve 80 is connected to the second port C, and the fourth port E is connected to the third port S). The exhaust port of the compressor 7 is connected to the third heat exchanger 10.

[0098] The following describes the circulation of the refrigerant when the dehumidification load of the indoor unit exceeds a preset load value.

[0099] Referring to Figure 6 , the exhaust port of compressor 7 delivers high-temperature, high-pressure refrigerant to reversing valve 80. The refrigerant then flows through reversing valve 80 into third heat exchanger 10 (serving as a condenser), undergoing heat exchange with air flowing through third heat exchanger 10 to become medium-temperature, high-pressure refrigerant. The medium-temperature, high-pressure refrigerant then passes through check valve 600 and is diverted to the three four-way valves 8. At this point, at least one of the three four-way valves 8 is in the second switching state. The refrigerant then flows through the three four-way valves 8 to the three indoor units 100, with the refrigerant flow rates controlled by the first expansion valve 91, the second expansion valve 92, and the third expansion valve 93, respectively.

[0100] In the indoor unit 100, the medium-temperature, high-pressure refrigerant flows through the second heat exchanger 6 to exchange heat with the return air flowing through it, transforming into a low-temperature, high-pressure, two-phase refrigerant. The low-temperature, high-pressure, two-phase refrigerant then flows to the expansion valve 9, where it is throttled and reduced in pressure, transforming into a low-temperature, low-pressure liquid refrigerant. The low-temperature, low-pressure liquid refrigerant then flows to the first heat exchanger 5, absorbing heat from the fresh air flowing through it, transforming into a low-temperature, low-pressure gaseous refrigerant. Finally, the low-temperature, low-pressure gaseous refrigerant flows through the corresponding fourth port E and third port S of the four-way valve 8, flows to the third solenoid valve 400, and returns to the compressor 7, completing one refrigerant cycle.

[0101] It can be understood that when the dehumidification load of the indoor unit is large, by using the third heat exchanger 10 as a condenser, the refrigerant can be condensed and cooled twice, thereby improving the cooling capacity and dehumidification capacity of the humidity control multi-split unit 1000.

[0102] In some embodiments, when the humidity control multi-split unit 1000 operates in the first mode, the indoor unit 100 is further configured to switch to the second mode when a first preset condition is satisfied. For example, the first preset condition includes the moisture content of the adsorbent on the surface of the first heat exchanger 5 being greater than a first preset threshold.

[0103] It is understood that when the indoor unit 100 is in the first state, the adsorbent on the first heat exchanger 5 is configured to absorb and store moisture in the air flowing through it. When the moisture content of the adsorbent on the first heat exchanger 5 exceeds a first preset threshold, the water absorption capacity of the adsorbent on the first heat exchanger 5 decreases, thereby reducing the dehumidification capacity of the indoor unit.

[0104] Therefore, when the humidity-regulating multi-split unit 1000 operates in the first mode and the indoor unit 100 meets the first preset condition, referring to Figure 8, the indoor unit 100 switches to the second state, the four-way valve 8 is reversed, the first heat exchanger 5 is used as a condenser, and the second heat exchanger 6 is used as an evaporator; the first fan 21 rotates in the second direction and is used as an exhaust fan, and the second fan 22 rotates in the first direction and is used as a supply fan.

[0105] In this case, fresh air enters the second passage 17 through the second air outlet 12. Driven by the second fan 22, it is filtered by the second filter element 4 and then undergoes heat exchange with the second heat exchanger 6, thereby reducing its temperature and cooling. During the cooling process, moisture in the fresh air is adsorbed by the adsorbent on the surface of the second heat exchanger 6, thereby reducing the humidity of the fresh air. The fresh air with reduced humidity then enters the room through the fourth air outlet 14.

[0106] In addition, indoor return air enters the first passage 16 through the third air outlet 13. Driven by the first fan 21, it exchanges heat with the first heat exchanger 5 to increase its temperature and remove moisture from the adsorbent. The moisture-laden return air is then filtered by the first filter element 3 before being discharged outdoors through the first air outlet 11.

[0107] In some embodiments, when the humidity control multi-split unit 1000 operates in the first mode, the indoor unit 100 is in the second state, and the dehumidification load of the indoor unit is less than or equal to a preset load value, the third heat exchanger 10 does not operate.

[0108] In this case, the first solenoid valve 200 and the third solenoid valve 400 are open, and the second solenoid valve 500 is closed. The reversing valve 80 is in the first switching state (i.e., the first port D is connected to the fourth port E, and the second port C is connected to the third port S). The exhaust port of the compressor 7 is not connected to the third heat exchanger 10.

[0109] The following describes the circulation of the refrigerant when the dehumidification load of the indoor unit is less than or equal to a preset load value.

[0110] Referring to Figure 6 , the exhaust port of compressor 7 delivers high-temperature, high-pressure refrigerant to first solenoid valve 200 , where it is then diverted to three four-way valves 8 . At this point, at least one of the three four-way valves 8 is in a first switching state. The refrigerant then flows through the three four-way valves 8 to the three indoor units 100 , with the refrigerant flow rates controlled by first, second, and third expansion valves 91 , 92 , and 93 , respectively.

[0111] In the indoor unit 100, the refrigerant flows through the first heat exchanger 5, exchanging heat with the return air flowing through it, transforming into a low-temperature, high-pressure, two-phase refrigerant. This low-temperature, high-pressure, two-phase refrigerant then flows to the expansion valve 9, where it is throttled and reduced in pressure, transforming into a low-temperature, low-pressure liquid refrigerant. The low-temperature, low-pressure liquid refrigerant then flows to the second heat exchanger 6, absorbing heat from the fresh air flowing through it, transforming into a low-temperature, low-pressure gaseous refrigerant. Finally, the low-temperature, low-pressure gaseous refrigerant flows through the corresponding second port C and third port S of the four-way valve 8, flows to the third solenoid valve 400, and returns to the compressor 7, completing one refrigerant cycle.

[0112] In some embodiments, when the humidity control multi-split unit 1000 operates in the first mode, the indoor unit 100 is in the second state, and the dehumidification load of the indoor unit is greater than a preset load value, the third heat exchanger 10 operates.

[0113] In this state, the first and second solenoid valves 200 and 500 are closed, and the third solenoid valve 400 is open. The reversing valve 80 is in the second switching state (i.e., the first port D of the reversing valve 80 is connected to the second port C, and the fourth port E is connected to the third port S). The exhaust port of the compressor 7 is connected to the third heat exchanger 10.

[0114] The following describes the circulation of the refrigerant when the dehumidification load of the indoor unit exceeds a preset load value.

[0115] Referring to Figure 6 , the exhaust port of compressor 7 delivers high-temperature, high-pressure refrigerant to reversing valve 80. The refrigerant then flows through reversing valve 80 into third heat exchanger 10 (serving as a condenser), undergoing heat exchange with air flowing through third heat exchanger 10 to become medium-temperature, high-pressure refrigerant. The medium-temperature, high-pressure refrigerant then passes through check valve 600 and is diverted to the three four-way valves 8. At this point, at least one of the three four-way valves 8 is in the first switching state. The refrigerant then flows through the three four-way valves 8 to the three indoor units 100, with the refrigerant flow rates controlled by the first expansion valve 91, the second expansion valve 92, and the third expansion valve 93, respectively.

[0116] In the indoor unit 100, the medium-temperature, high-pressure refrigerant flows through the first heat exchanger 5 to exchange heat with the return air flowing through it, transforming into a low-temperature, high-pressure, two-phase refrigerant. The low-temperature, high-pressure, two-phase refrigerant then flows to the expansion valve 9, where it is throttled and reduced in pressure, transforming into a low-temperature, low-pressure liquid refrigerant. The low-temperature, low-pressure liquid refrigerant then flows to the second heat exchanger 6, where it absorbs heat from the fresh air flowing through it, transforming into a low-temperature, low-pressure gaseous refrigerant. Finally, the low-temperature, low-pressure gaseous refrigerant flows through the corresponding second port C and third port S of the four-way valve 8, flows to the third solenoid valve 400, and returns to the compressor 7, completing one refrigerant cycle.

[0117] It can be understood that when the dehumidification load of the indoor unit is large, by using the third heat exchanger 10 as a condenser, the refrigerant can be condensed and cooled twice, thereby improving the cooling capacity and dehumidification capacity of the humidity control multi-split unit 1000.

[0118] In some embodiments, when the humidity control multi-split unit 1000 operates in the first mode, the indoor unit 100 is further configured to switch to the first state when a second preset condition is satisfied. For example, the second preset condition includes the moisture content of the adsorbent on the second heat exchanger 6 being greater than a first preset threshold.

[0119] It is understood that when the indoor unit 100 is in the second state, the adsorbent on the second heat exchanger 6 is configured to absorb and store moisture in the air flowing through it. When the moisture content of the adsorbent on the second heat exchanger 6 exceeds a first preset threshold, the water absorption capacity of the adsorbent on the second heat exchanger 6 decreases, thereby reducing the dehumidification capacity of the indoor unit.

[0120] In this case, the indoor unit 100 can be switched to the first state, and the humidity-regulating multi-split unit 1000 continues to operate in the first mode, so that the moisture in the adsorbent on the second heat exchanger 6 can be carried away by the hot air, and the adsorbent on the first heat exchanger 5 can adsorb the moisture in the air flowing through to achieve the dehumidification function.

[0121] In this way, by continuously switching the indoor unit 100 between the first state and the second state, the air outlet direction of the fan is switched cyclically, so that dehumidification of the indoor air can be achieved without omitting the air valve switching device in the humidity control multi-split unit 1000, thereby simplifying the structure of the humidity control multi-split unit 1000 and reducing the volume and manufacturing cost of the humidity control multi-split unit 1000.

[0122] In some embodiments, the humidity control multi-split unit 1000 is configured to operate in a second mode (winter humidification mode) to humidify the indoor air.

[0123] 7 , when the humidity-control multi-split unit 1000 operates in the second mode and the indoor unit 100 is in the first state, the first heat exchanger 5 is used as a condenser and the second heat exchanger 6 is used as an evaporator; the first fan 21 rotates in the first direction and is used as a supply fan; the second fan 22 rotates in the second direction and is used as an exhaust fan.

[0124] In this case, fresh air enters the first passage 16 through the first air outlet 11. Driven by the first fan 21, it is filtered by the first filter element 3 and then undergoes heat exchange with the first heat exchanger 5, thereby being heated. The heated fresh air removes moisture from the adsorbent on the first heat exchanger 5, and after increasing its humidity, it enters the room through the third air outlet 13.

[0125] In addition, indoor return air enters the second passage 17 through the fourth air outlet 14. Driven by the second fan 22, it exchanges heat with the second heat exchanger 6, thereby being cooled and reduced in temperature. During this cooling process, moisture in the return air is adsorbed by the adsorbent on the surface of the second heat exchanger 6. The cooled and dehumidified return air is then filtered by the second filter element 4 and discharged outdoors through the second air outlet 12.

[0126] In some embodiments, when the humidity control multi-split unit 1000 operates in the second mode, the indoor unit 100 is in the first state, and the humidification load of the indoor unit is less than or equal to the preset load value, the third heat exchanger 10 does not operate.

[0127] In this case, the first solenoid valve 200 and the third solenoid valve 400 are open, and the second solenoid valve 500 is closed. The reversing valve 80 is in the first switching state (i.e., the first port D is connected to the fourth port E, and the second port C is connected to the third port S). The exhaust port of the compressor 7 is not connected to the third heat exchanger 10. It should be noted that the preset load value is determined based on the actual operating conditions of the humidity control multi-split unit 1000.

[0128] The following describes the circulation of the refrigerant when the humidification load of the indoor unit is less than or equal to a preset load value.

[0129] Referring to Figure 6 , the exhaust port of compressor 7 delivers high-temperature, high-pressure refrigerant to first solenoid valve 200 , where it is then diverted to three four-way valves 8 . At this point, at least one of the three four-way valves 8 is in a first switching state. The refrigerant then flows through the three four-way valves 8 to the three indoor units 100 , with the refrigerant flow rates controlled by first, second, and third expansion valves 91 , 92 , and 93 , respectively.

[0130] In the indoor unit 100, the refrigerant flows through the first heat exchanger 5 to exchange heat with the fresh air flowing through it, transforming into a low-temperature, high-pressure, two-phase refrigerant. The low-temperature, high-pressure, two-phase refrigerant then flows to the expansion valve 9, where it is throttled and reduced in pressure, transforming into a low-temperature, low-pressure liquid refrigerant. The low-temperature, low-pressure liquid refrigerant then flows to the second heat exchanger 6, where it absorbs heat from the fresh air flowing through it, transforming into a low-temperature, low-pressure gaseous refrigerant. Finally, the low-temperature, low-pressure gaseous refrigerant flows through the corresponding second port C and third port S of the four-way valve 8, flows to the third solenoid valve 400, and returns to the compressor 7, completing one refrigerant cycle.

[0131] In some embodiments, when the humidity control multi-split unit 1000 operates in the second mode, the indoor unit 100 is in the first state, and the humidification load of the indoor unit is greater than a preset load value, the third heat exchanger 10 operates.

[0132] In this case, the first and second solenoid valves 200 and 500 are open, and the third solenoid valve 400 is closed. The reversing valve 80 is in the first switching state (i.e., the first port D is connected to the fourth port E, and the second port C is connected to the third port S). The exhaust port of the compressor 7 is disconnected from the third heat exchanger 10, while the intake port of the compressor 7 is connected to the third heat exchanger 10.

[0133] The following describes the circulation of the refrigerant when the humidification load of the indoor unit exceeds a preset load value.

[0134] Referring to Figure 6 , the exhaust port of compressor 7 delivers high-temperature, high-pressure refrigerant to first solenoid valve 200 , where it is then diverted to three four-way valves 8 . At this point, at least one of the three four-way valves 8 is in a first switching state. The refrigerant then flows through the three four-way valves 8 to the three indoor units 100 , with the refrigerant flow rates controlled by first, second, and third expansion valves 91 , 92 , and 93 , respectively.

[0135] In the indoor unit 100, the refrigerant flows through the first heat exchanger 5, exchanging heat with the incoming air, transforming into a low-temperature, high-pressure, two-phase refrigerant. The low-temperature, high-pressure, two-phase refrigerant then flows to the expansion valve 9, where it is throttled and reduced in pressure, transforming into a low-temperature, low-pressure liquid refrigerant. The low-temperature, low-pressure liquid refrigerant then flows to the second heat exchanger 6, absorbing heat from the incoming air, transforming into a low-temperature, low-pressure gaseous refrigerant. The low-temperature, low-pressure gaseous refrigerant then flows through the second and third ports C and S of the corresponding four-way valve 8 to the second solenoid valve 500, and then through the second solenoid valve 500 to the third heat exchanger 10. Finally, the low-temperature, low-pressure gaseous refrigerant undergoes heat exchange with the incoming air in the third heat exchanger 10, absorbing heat from the air before returning to the compressor 7 via the reversing valve 80, completing one refrigerant cycle.

[0136] It is understandable that when the humidification load of the indoor unit is large, the refrigerant can be heated twice by using the third heat exchanger 10 as an evaporator, thereby improving the heating capacity and humidification capacity of the humidity control multi-split unit 1000.

[0137] In some embodiments, when the humidity control multi-split unit 1000 operates in the second mode, the indoor unit 100 is further configured to switch to the second state when a third preset condition is satisfied. For example, the third preset condition includes the moisture content of the adsorbent on the first heat exchanger 5 being less than a second preset threshold.

[0138] It is understood that when the indoor unit 100 is in the first state, the adsorbent element on the first heat exchanger 5 is configured to release stored moisture to humidify the fresh air flowing therethrough. When the moisture content of the adsorbent element on the first heat exchanger 5 is less than the second preset threshold, the moisture stored in the adsorbent element on the first heat exchanger 5 is insufficient to humidify the fresh air flowing therethrough, thereby reducing the humidification capacity of the indoor unit.

[0139] Therefore, when the humidity-control multi-split unit 1000 operates in the second mode and the indoor unit 100 meets the third preset condition, referring to Figure 8, the indoor unit 100 switches to the second state, the four-way valve 8 is reversed, the first heat exchanger 5 is used as an evaporator, and the second heat exchanger 6 is used as a condenser; the first fan 21 rotates in the second direction and is used as an exhaust fan, and the second fan 22 rotates in the first direction and is used as a supply fan.

[0140] In this case, fresh air enters the second passage 17 through the second air outlet 12. Driven by the second fan 22, it is filtered by the second filter element 4 and then undergoes heat exchange with the second heat exchanger 6, thereby being heated. The heated fresh air then removes moisture stored in the adsorbent on the surface of the second heat exchanger 6, increasing the humidity, and then enters the room through the fourth air outlet 14.

[0141] Furthermore, indoor return air enters the first passage 16 through the third air outlet 13. Driven by the first fan 21, it exchanges heat with the first heat exchanger 5 to reduce its temperature. In this process, moisture carried by the return air is precipitated and adsorbed and stored by the adsorbent on the surface of the first heat exchanger 5. The reduced-humidity return air is then filtered by the first filter element 3 and discharged outdoors through the first air outlet 11.

[0142] In some embodiments, when the humidity control multi-split unit 1000 operates in the second mode, the indoor unit 100 is in the second state, and the humidification load of the indoor unit is less than or equal to the preset load value, the third heat exchanger 10 does not operate.

[0143] In this case, the first solenoid valve 200 and the third solenoid valve 400 are open, and the second solenoid valve 500 is closed. The reversing valve 80 is in the first switching state (i.e., the first port D is connected to the fourth port E, and the second port C is connected to the third port S). The exhaust port of the compressor 7 is not connected to the third heat exchanger 10.

[0144] The following describes the circulation of the refrigerant when the humidification load of the indoor unit is less than or equal to a preset load value.

[0145] Referring to Figure 6 , the exhaust port of compressor 7 delivers high-temperature, high-pressure refrigerant to first solenoid valve 200 , where it is then diverted to three four-way valves 8 . At this point, at least one of the three four-way valves 8 is in the second switching state. The refrigerant then flows through the three four-way valves 8 to the three indoor units 100 , with the refrigerant flow rates controlled by first expansion valve 91 , second expansion valve 92 , and third expansion valve 93 , respectively.

[0146] In the indoor unit 100, the refrigerant flows through the second heat exchanger 6 to exchange heat with the fresh air flowing through it, transforming into a low-temperature, high-pressure, two-phase refrigerant. This low-temperature, high-pressure, two-phase refrigerant then flows to the expansion valve 9, where it is throttled and reduced in pressure, transforming into a low-temperature, low-pressure liquid refrigerant. The low-temperature, low-pressure liquid refrigerant then flows to the first heat exchanger 5, where it absorbs heat from the return air flowing through it, transforming into a low-temperature, low-pressure gaseous refrigerant. Finally, the low-temperature, low-pressure gaseous refrigerant flows through the corresponding fourth port E and third port S of the four-way valve 8, flows to the third solenoid valve 400, and returns to the compressor 7, completing one refrigerant cycle.

[0147] In some embodiments, when the humidity control multi-split unit 1000 operates in the second mode, the indoor unit 100 is in the second state, and the humidification load of the indoor unit is greater than a preset load value, the third heat exchanger 10 operates.

[0148] In this case, the first and second solenoid valves 200 and 500 are open, and the third solenoid valve 400 is closed. The reversing valve 80 is in the first switching state (i.e., the first port D is connected to the fourth port E, and the second port C is connected to the third port S). The exhaust port of the compressor 7 is disconnected from the third heat exchanger 10, while the intake port of the compressor 7 is connected to the third heat exchanger 10.

[0149] The following describes the circulation of the refrigerant when the humidification load of the indoor unit exceeds a preset load value.

[0150] Referring to Figure 6 , the exhaust port of compressor 7 delivers high-temperature, high-pressure refrigerant to first solenoid valve 200 , where it is then diverted to three four-way valves 8 . At this point, at least one of the three four-way valves 8 is in a first switching state. The refrigerant then flows through the three four-way valves 8 to the three indoor units 100 , with the refrigerant flow rates controlled by first, second, and third expansion valves 91 , 92 , and 93 , respectively.

[0151] In the indoor unit 100, the refrigerant flows through the second heat exchanger 6, exchanging heat with the incoming air flowing through it, transforming into a low-temperature, high-pressure, two-phase refrigerant. The low-temperature, high-pressure, two-phase refrigerant then flows to the expansion valve 9, where it is throttled and reduced in pressure, transforming into a low-temperature, low-pressure liquid refrigerant. The low-temperature, low-pressure liquid refrigerant then flows to the first heat exchanger 5, absorbing heat from the incoming air flowing through it, transforming into a low-temperature, low-pressure gaseous refrigerant. The low-temperature, low-pressure gaseous refrigerant then flows through the corresponding fourth port E and third port S of the four-way valve 8 to the second solenoid valve 500, and then through the second solenoid valve 500 to the third heat exchanger 10. Finally, the low-temperature, low-pressure gaseous refrigerant undergoes heat exchange with the incoming air in the third heat exchanger 10, absorbing heat from the air before returning to the compressor 7 via the reversing valve 80, completing one refrigerant cycle.

[0152] It is understandable that when the humidification load of the indoor unit is large, the refrigerant can be heated twice by using the third heat exchanger 10 as an evaporator, thereby improving the heating capacity and humidification capacity of the humidity control multi-split unit 1000.

[0153] In some embodiments, when the humidity control multi-split unit 1000 operates in the second mode, the indoor unit 100 is further configured to switch to the first state when a fourth preset condition is satisfied. For example, the fourth preset condition includes the moisture content of the adsorbent on the second heat exchanger 6 being less than a second preset threshold.

[0154] It is understood that when the indoor unit 100 is in the second state, the adsorbent element on the second heat exchanger 6 is configured to release stored moisture to humidify the fresh air flowing therethrough. When the moisture content of the adsorbent element on the second heat exchanger 6 is less than a second preset threshold, the moisture stored in the adsorbent element on the second heat exchanger 6 is insufficient to humidify the fresh air flowing therethrough, thereby reducing the humidification capacity of the indoor unit.

[0155] In this case, the indoor unit 100 can be switched to the second state, and the humidity-control multi-split unit 1000 continues to operate in the second mode, so that the second heat exchanger 6 can adsorb moisture in the air flowing through and the adsorbent on the first heat exchanger 5 can release the stored moisture to achieve the humidification function.

[0156] In this way, by continuously switching the indoor unit 100 between the first state and the second state, the air outlet direction of the fan is switched cyclically, so that the indoor air can be humidified without the air valve switching device in the humidity control multi-split unit 1000, thereby simplifying the structure of the humidity control multi-split unit 1000 and reducing the volume and manufacturing cost of the humidity control multi-split unit 1000.

[0157] In some embodiments, as shown in FIG1B , the humidity control multi-split unit 1000 further includes a first sensor 120. The first sensor 120 is configured to detect the fresh air temperature Toa and the fresh air humidity Hoa.

[0158] In some embodiments, the humidity control multi-split unit 1000 further includes a controller 110. The controller 110 is configured to calculate the absolute humidity doa of the outdoor fresh air based on the fresh air temperature Toa and fresh air humidity Hoa detected by the first sensor 120, and adjust the frequency Fx1 of the compressor based on doa and the set indoor absolute humidity ds.

[0159] In some embodiments, when the humidity control multi-split unit 1000 operates in the first mode, the frequency of the compressor can be calculated using formula (1).

[0160] In formula (1), A, B, and n are constants; Q is the set air volume (first air volume), M is the maximum air volume (second air volume), or Q is the number of indoor units turned on, M represents the total number of indoor units; C is the correction value. For example, is the first parameter. For example, formula (1) is the first corresponding relationship.

[0161] It should be noted that the value of C depends on the difference between the absolute humidity doa of the outdoor fresh air and the set absolute humidity ds indoors. For example, when 0g ≤ doa-ds ≤ 2g, the value of C is -5; when 2g < doa-ds ≤ 4g, the value of C is 0; when 4g < doa-ds ≤ 8g, the value of C is 3; when 8g < doa-ds ≤ 12g, the value of C is 6; and when 12g < doa-ds, the value of C is 10.

[0162] In some embodiments, when the humidity control multi-split unit 1000 operates in the second mode, the frequency of the compressor can be calculated using formula (2).

[0163] In formula (2), A1, B1, and n1 are constants; Q is the set air volume, and M is the maximum air volume, or Q is the number of indoor units turned on, and M is the total number of indoor units; C1 is the correction value. For example, formula (2) represents the second corresponding relationship.

[0164] It should be noted that the value of C1 depends on the difference between the set indoor absolute humidity ds and the outdoor fresh air absolute humidity doa. For example, when 0 ≤ ds - doa ≤ 2, the value of C is -5; when 2 < ds - doa ≤ 4, the value of C is 0; when 4 < ds - doa ≤ 8, the value of C is 5; and when 8 < ds - doa, the value of C is 10.

[0165] It should be noted that formula (1) and formula (2) are fitted by the dehumidification capacity of the humidity control multi-split unit 1000 operating in the first mode under different working conditions. Therefore, the compressor can operate at a corresponding frequency according to different dehumidification requirements, thereby improving the reliability of the compressor operation and helping to reduce the energy consumption of the humidity control multi-split unit 1000.

[0166] It can be understood that by introducing the number of indoor units or the air volume (such as Q, M) as parameters in formulas (1) and (2), when the number of turned-on indoor units decreases (or the air volume decreases), the compressor can reduce the frequency accordingly according to the reduced number of indoor units or the reduced air volume, thereby helping to reduce the energy consumption of the humidity-control multi-split unit 1000.

[0167] In addition, the fresh air temperature Toa is introduced into formulas (1) and (2). When Toa ≤ 0°C, the compressor can reduce the frequency, thereby preventing frost and ice from forming due to the evaporation temperature being too low, which is beneficial to improving the reliability and stability of the humidity control multi-split unit 1000.

[0168] In some embodiments, the controller 110 is further configured to determine the operating mode of the humidity control multi-split unit 1000 based on the difference between doa and ds. For example, if doa - ds ≥ 0, the humidity control multi-split unit 1000 is controlled to enter the first mode; if doa - ds < 0, the humidity control multi-split unit 1000 is controlled to enter the second mode.

[0169] In some embodiments, the controller 110 is further configured to: when the humidity control multi-split machine 1000 enters the first mode, determine whether the first condition or the second condition is met.

[0170] For example, if the first condition or the second condition is met, the controller 110 controls the first solenoid valve and the second solenoid valve to be closed, the third solenoid valve to be opened, and the reversing valve is in the first switching state; if the first condition and the second condition are not met, the controller 110 controls the first solenoid valve and the third solenoid valve to be opened, the second solenoid valve to be closed, and the reversing valve is in the second switching state.

[0171] In some embodiments, the first condition includes Pd≥α, where Pd represents the exhaust pressure of the compressor and α is a preset value (a first preset value). For example, the exhaust pressure Pd can be calculated based on the temperature detection value of the gas pipe temperature sensor, which will not be repeated here.

[0172] In some embodiments, the second condition includes doa-ds≥X1, where X1 is a preset value (a second preset value).

[0173] It will be appreciated that if either the first or second condition is met, it indicates that the dehumidification load of the indoor unit is greater than the preset load value, and the controller 110 needs to control the states of the various valves to operate the third heat exchanger 10, thereby improving the cooling and dehumidification capabilities of the multi-split humidity control unit 1000. If neither the first nor the second condition is met, it indicates that the dehumidification load of the indoor unit is less than or equal to the preset load value, and the controller 110 needs to control the states of the various valves to disable the third heat exchanger 10, thereby reducing the energy consumption of the multi-split humidity control unit 1000.

[0174] In some embodiments, the controller 110 is further configured to determine whether the third condition or the fourth condition is met when the humidity control multi-split unit 1000 enters the second mode.

[0175] For example, if the third condition or the fourth condition is met, the controller 110 controls the first solenoid valve and the second solenoid valve to open, the reversing valve is in the first switching state, and the third solenoid valve is closed; if the third condition and the fourth condition are not met, the controller 110 controls the first solenoid valve and the third solenoid valve to open, the second solenoid valve is closed, and the reversing valve is in the first switching state.

[0176] In some embodiments, the third condition includes Ps<β, where Ps represents the exhaust pressure of the compressor, and β is a preset value (a third preset value).

[0177] In some embodiments, the fourth condition includes doa-ds≤X2, where X2 is a preset value (a fourth preset value).

[0178] It will be appreciated that if the third or fourth condition is met, it indicates that the humidification load of the indoor unit is greater than the preset load value, and the controller 110 needs to control the states of the various valves to operate the third heat exchanger 10, thereby improving the heating and humidification capabilities of the humidity control multi-split unit 1000. If the third or fourth condition is not met, it indicates that the humidification load of the indoor unit is less than or equal to the preset load value, and the controller 110 needs to control the states of the various valves to disable the third heat exchanger 10, thereby reducing the energy consumption of the humidity control multi-split unit 1000.

[0179] In some embodiments, the controller 110 is further configured to control the compressor frequency and the state switching time of the indoor unit according to the latent heat load and the sensible heat load.

[0180] For example, referring to Fig. 1B, the humidity-control multi-split unit 1000 further includes a second sensor 130. The second sensor 130 is configured to detect the return air temperature Tra and the return air humidity Hra.

[0181] In some embodiments, the controller 110 is further configured to calculate the absolute humidity dra of the indoor return air based on the return air temperature Tra and the return air humidity Hra, and to calculate the sensible heat factor SHF based on the return air temperature Tra and the return air absolute humidity dra using formulas (3) to (5). Qq = E × [Gρ × (toa-dra)]; (3) Qx = Cm × [Gρ × (Toa-Tra)]; (4) SHF = Qx / (Qx + Qq); (5)

[0182] In formulas (3) to (5), Qq is the latent heat load, Qx is the sensible heat load, G is the air volume, ρ is the density, and E and Cm are constants.

[0183] In some embodiments, the controller 110 is further configured to: when SHF ≥ 0.7, adjust the frequency of the compressor to control the evaporation temperature according to formula (6): Fx1 = A3 × (SHF) 2 +TL / Te×(SHF); (6)

[0184] In formula (6), TL is the gas pipe temperature detection value in the refrigerant circuit, Te is the liquid pipe temperature detection value in the refrigerant circuit, and A3 is a constant.

[0185] It should be noted that when the Fx1 value calculated by the controller 110 through formula (6) is higher than the maximum frequency limit value Fx1max (such as 70Hz) of the compressor, the operating frequency of the compressor is adjusted according to FX1=Fx1max.

[0186] In some embodiments, the controller 110 is further configured to: when SHF < 0.3, calculate the state switching time TH of the indoor unit by formula (7): TH = A2 × (SHF) 2 +B2×(SHF); (7)

[0187] In formula (7), A2 and B2 are constants.

[0188] The state switching time TH of the indoor unit has a minimum preset value THmin (eg, 3 minutes). When the controller 110 calculates that the state switching time TH of the indoor unit is less than THmin, the state switching time of the indoor unit is adjusted according to TH=THmin.

[0189] It can be understood that when the humidity control multi-split unit 1000 is in a high temperature and high humidity or high temperature and low humidity environment, due to the large difference between the latent heat load and the sensible heat load, the frequency of the compressor can be adjusted according to the sensible heat load and the latent heat load, thereby reducing the energy consumption of the humidity control multi-split unit 1000.

[0190] When the sensible heat factor SHF is large (eg, SHF ≥ 0.7), the humidity control multi-split unit 1000 operates in a high sensible heat mode, and the frequency of the compressor is controlled according to the SHF.

[0191] When the sensible heat factor SHF is small (such as SHF < 0.3), the dehumidification capacity can be increased by shortening the state switching time of the indoor unit without the need to perform frequency increase control on the compressor, which is beneficial to reducing the energy consumption of the humidity control multi-split unit 1000.

[0192] Some embodiments of the present disclosure provide another multi-split humidity control system 1000. This system can switch wind direction by switching the airflow direction of the fan, thereby achieving both dehumidification and humidification functions. Furthermore, the system 1000 omits the third heat exchanger 10 and its associated structure, further simplifying the structure of the system 1000 and reducing its size and manufacturing cost.

[0193] 9 , the humidity control multi-split unit 100 includes a first indoor unit 101, a second indoor unit 102, and a third indoor unit 103. The first indoor unit 101, the second indoor unit 102, and the third indoor unit 103 are connected to a refrigerant circuit of the humidity control multi-split unit 1000.

[0194] In some embodiments, the humidity control multi-split unit 1000 further includes a compressor 7 .

[0195] In some embodiments, the humidity control multi-split unit 100 further includes a plurality of four-way valves 8 .

[0196] In some embodiments, the plurality of four-way valves 8 include a first four-way valve 81, which corresponds to the first indoor unit 101. A fourth port E of the first four-way valve 81 is connected in series with the second heat exchanger 6 of the first indoor unit 101, the first expansion valve 91, the first heat exchanger 5 of the first indoor unit 101, and the second port C of the first four-way valve 81.

[0197] In some embodiments, the plurality of four-way valves 8 further includes a second four-way valve 82, which corresponds to the second indoor unit 102. The fourth port E of the second four-way valve 82 is connected in series with the second heat exchanger 6 of the second indoor unit 102, the second expansion valve 92, the first heat exchanger 5 of the second indoor unit 102, and the second port C of the second four-way valve 82.

[0198] In some embodiments, the plurality of four-way valves 8 further includes a third four-way valve 83, which corresponds to the third indoor unit 103. A fourth port E of the third four-way valve 83 is connected in series with the second heat exchanger 6 of the third indoor unit 103, the third expansion valve 93, the first heat exchanger 5 of the third indoor unit 103, and the second port C of the third four-way valve 83.

[0199] The exhaust port of the compressor 7 is connected to the first port D of the first four-way valve 81 , the second four-way valve 82 and the third four-way valve 83 , and the intake port of the compressor 7 is connected to the third port S of the first four-way valve 81 , the second four-way valve 82 and the third four-way valve 83 .

[0200] It can be understood that by setting three four-way valves corresponding to three indoor units, the states of multiple indoor units can be made relatively independent. In this way, the indoor units can control the fan to reverse according to actual conditions, which is conducive to improving the flexibility of dehumidification or humidification of the humidity-regulating multi-split unit 1000.

[0201] In some embodiments, the humidity control multi-split unit 100 further includes a check valve 18. The check valve 18 is connected in series between the exhaust port of the compressor 7 and the first port D of the four-way valve, and is configured to prevent the refrigerant at the first port D of the four-way valve from flowing back to the exhaust port of the compressor 7, thereby improving the stability and reliability of refrigerant transmission.

[0202] In some embodiments, the humidity control multi-split unit 1000 is configured to operate in a first mode (summer dehumidification mode) to dehumidify the indoor air.

[0203] 9 , when the humidity-control multi-split unit 1000 operates in the first mode and the indoor unit 100 is in the second state, the first heat exchanger 5 is used as a condenser and the second heat exchanger 6 is used as an evaporator; the first fan 21 rotates in the second direction and is used as an exhaust fan, and the second fan 22 rotates in the first direction and is used as a supply fan; the first port D of the four-way valve 8 is connected to the second port C, and the fourth port E is connected to the third port S.

[0204] In this case, fresh air enters the second passage 17 through the second air outlet 12. Driven by the second fan 22, it is filtered by the second filter element 4 and then undergoes heat exchange with the second heat exchanger 6, thereby reducing its temperature and cooling. During the cooling process, moisture in the fresh air is adsorbed by the adsorbent on the surface of the second heat exchanger 6, thereby reducing the humidity of the fresh air. The fresh air with reduced humidity then enters the room through the fourth air outlet 14.

[0205] In addition, indoor return air enters the first passage 16 through the third air outlet 13. Driven by the first fan 21, it exchanges heat with the first heat exchanger 5 to increase its temperature and remove moisture from the adsorbent. The moisture-laden return air is then filtered by the first filter element 3 before being discharged outdoors through the first air outlet 11.

[0206] Hereinafter, the refrigerant circulation when the humidity control multi-split machine 1000 operates in the first mode and the indoor units 100 are in the second state will be described.

[0207] Referring to Figure 9 , the exhaust port of compressor 7 delivers high-temperature, high-pressure refrigerant to check valve 18. The refrigerant is then diverted through check valve 18 to the three four-way valves 8. At this point, at least one of the three four-way valves 8 is in the second switching state. The refrigerant then flows through the three four-way valves 8 to the three indoor units 100, with the refrigerant flow rates controlled by the first expansion valve 91, the second expansion valve 92, and the third expansion valve 93, respectively.

[0208] In the indoor unit 100, the refrigerant flows through the first heat exchanger 5, exchanging heat with the return air flowing through it, transforming into a low-temperature, high-pressure, two-phase refrigerant. This low-temperature, high-pressure, two-phase refrigerant then flows to the expansion valve 9, where it is throttled and reduced in pressure, transforming into a low-temperature, low-pressure liquid refrigerant. The low-temperature, low-pressure liquid refrigerant then flows to the second heat exchanger 6, absorbing heat from the fresh air flowing through it, transforming into a low-temperature, low-pressure gaseous refrigerant. Finally, the low-temperature, low-pressure gaseous refrigerant returns to the compressor 7 via the corresponding fourth port E and third port S of the four-way valve 8, completing one refrigerant cycle.

[0209] In some embodiments, when the humidity control multi-split unit 1000 operates in the first mode, the indoor unit 100 is further configured to switch to the first state when a second preset condition is met.

[0210] 10 , when the humidity-control multi-split unit 1000 operates in the first mode and the indoor unit 100 is in the first state, the four-way valve 8 is reversed, the first heat exchanger 5 is used as an evaporator, and the second heat exchanger 6 is used as a condenser; the first fan 21 rotates in the first direction and is used as a supply fan; the second fan 22 rotates in the second direction and is used as an exhaust fan; the first port D of the four-way valve 8 is connected to the fourth port E, and the second port C is connected to the third port S.

[0211] In this case, fresh air enters the first passage 16 through the first air outlet 11. Driven by the first fan 21, it is filtered by the first filter element 3 and then undergoes heat exchange with the first heat exchanger 5, thereby reducing its temperature and cooling. During the cooling process, moisture in the fresh air is adsorbed by the adsorbent on the surface of the first heat exchanger 5, thereby reducing the humidity of the fresh air. The fresh air with reduced humidity then enters the room through the third air outlet 13.

[0212] In addition, indoor return air enters the second passage 17 through the fourth air outlet 14. Driven by the second fan 22, it exchanges heat with the second heat exchanger 6 to increase its temperature and remove moisture from the adsorbent. The moisture-laden return air is then filtered by the second filter element 4 before being discharged outdoors through the second air outlet 12.

[0213] Hereinafter, the refrigerant circulation when the humidity control multi-split machine 1000 operates in the first mode and the indoor units 100 are in the first state will be described.

[0214] Referring to Figure 10 , the exhaust port of compressor 7 delivers high-temperature, high-pressure refrigerant to check valve 18. The refrigerant is then diverted through check valve 18 to three four-way valves 8. At this point, at least one of the three four-way valves 8 is in a first switching state. The refrigerant then flows through the three four-way valves 8 to the three indoor units 100, with the refrigerant flow rates controlled by the first expansion valve 91, the second expansion valve 92, and the third expansion valve 93, respectively.

[0215] In the indoor unit 100, the refrigerant flows through the second heat exchanger 6 to exchange heat with the return air flowing through it, transforming into a low-temperature, high-pressure, two-phase refrigerant. The low-temperature, high-pressure, two-phase refrigerant then flows to the expansion valve 9, where it is throttled and reduced in pressure, transforming into a low-temperature, low-pressure liquid refrigerant. The low-temperature, low-pressure liquid refrigerant then flows to the first heat exchanger 5, where it absorbs heat from the fresh air flowing through it, transforming into a low-temperature, low-pressure gaseous refrigerant. Finally, the low-temperature, low-pressure gaseous refrigerant returns to the compressor 7 via the corresponding second port C and third port S of the four-way valve 8, completing one refrigerant cycle.

[0216] In some embodiments, when the humidity control multi-split unit 1000 operates in the first mode, the indoor unit 100 is further configured to switch to the second mode when a first preset condition is met. Thus, by cyclically switching the indoor unit 100 between the first and second modes, the airflow direction of the fan cyclically switches, thereby achieving dehumidification of the indoor air without requiring the damper switching device within the humidity control multi-split unit 1000. This simplifies the structure of the humidity control multi-split unit 1000 and reduces its size and manufacturing cost.

[0217] In some embodiments, the humidity control multi-split unit 1000 is configured to operate in a second mode (winter humidification mode) to humidify the indoor air.

[0218] 9 , when the humidity-control multi-split unit 1000 operates in the second mode and the indoor unit 100 is in the second state, the first heat exchanger 5 is used as an evaporator and the second heat exchanger 6 is used as a condenser; the first fan 21 rotates in the second direction and is used as an exhaust fan, and the second fan 22 rotates in the first direction and is used as a supply fan; the first port D of the four-way valve 8 is connected to the fourth port E, and the second port C is connected to the third port S.

[0219] In this case, fresh air enters the second passage 17 through the second air outlet 12. Driven by the second fan 22, it is filtered by the second filter element 4 and then undergoes heat exchange with the second heat exchanger 6, thereby being heated. The heated fresh air then removes moisture stored in the adsorbent on the surface of the second heat exchanger 6, increasing the humidity, and then enters the room through the fourth air outlet 14.

[0220] Furthermore, indoor return air enters the first passage 16 through the third air outlet 13. Driven by the first fan 21, it exchanges heat with the first heat exchanger 5 to reduce its temperature. In this process, moisture carried by the return air is precipitated and adsorbed and stored by the adsorbent on the surface of the first heat exchanger 5. The reduced-humidity return air is then filtered by the first filter element 3 and discharged outdoors through the first air outlet 11.

[0221] Hereinafter, the refrigerant circulation when the humidity control multi-split machine 1000 operates in the second mode and the indoor units 100 are in the second state will be described.

[0222] Referring to Figure 9 , the exhaust port of compressor 7 delivers high-temperature, high-pressure refrigerant to check valve 18. The refrigerant is then diverted through check valve 18 to three four-way valves 8. At this point, at least one of the three four-way valves 8 is in a first switching state. The refrigerant then flows through the three four-way valves 8 to the three indoor units 100, with the refrigerant flow rates controlled by the first expansion valve 91, the second expansion valve 92, and the third expansion valve 93, respectively.

[0223] In the indoor unit 100, the refrigerant flows through the second heat exchanger 6 to exchange heat with the fresh air flowing through it, transforming into a low-temperature, high-pressure, two-phase refrigerant. The low-temperature, high-pressure, two-phase refrigerant then flows to the expansion valve 9, where it is throttled and reduced in pressure, transforming into a low-temperature, low-pressure liquid refrigerant. The low-temperature, low-pressure liquid refrigerant then flows to the first heat exchanger 5, where it absorbs heat from the return air flowing through it, transforming into a low-temperature, low-pressure gaseous refrigerant. Finally, the low-temperature, low-pressure gaseous refrigerant returns to the compressor 7 via the corresponding second port C and third port S of the four-way valve 8, completing one refrigerant cycle.

[0224] In some embodiments, when the humidity control multi-split unit 1000 operates in the first mode, the indoor unit 100 is further configured to switch to the first state when a fourth preset condition is met.

[0225] 10 , when the humidity-control multi-split unit 1000 operates in the second mode and the indoor unit 100 is in the first state, the four-way valve 8 is reversed, the first heat exchanger 5 is used as a condenser, and the second heat exchanger 6 is used as an evaporator; the first fan 21 rotates in the first direction and is used as a supply fan; the second fan 22 rotates in the second direction and is used as an exhaust fan; the first port D of the four-way valve 8 is connected to the second port C, and the fourth port E is connected to the third port S.

[0226] In this case, fresh air enters the first passage 16 through the first air outlet 11. Driven by the first fan 21, it is filtered by the first filter element 3 and then undergoes heat exchange with the first heat exchanger 5, thereby being heated. The heated fresh air removes moisture from the adsorbent on the first heat exchanger 5, and after increasing its humidity, it enters the room through the third air outlet 13.

[0227] In addition, indoor return air enters the second passage 17 through the fourth air outlet 14. Driven by the second fan 22, it exchanges heat with the second heat exchanger 6, thereby being cooled and reduced in temperature. During this cooling process, moisture in the return air is adsorbed by the adsorbent on the surface of the second heat exchanger 6. The cooled and dehumidified return air is then filtered by the second filter element 4 and discharged outdoors through the second air outlet 12.

[0228] Hereinafter, the refrigerant circulation when the humidity control multi-split machine 1000 operates in the second mode and the indoor units 100 are in the first state will be described.

[0229] Referring to Figure 10 , the exhaust port of compressor 7 delivers high-temperature, high-pressure refrigerant to check valve 18. The refrigerant is then diverted through check valve 18 to the three four-way valves 8. At this point, at least one of the three four-way valves 8 is in the second switching state. The refrigerant then flows through the three four-way valves 8 to the three indoor units 100, with the refrigerant flow rates controlled by the first expansion valve 91, the second expansion valve 92, and the third expansion valve 93, respectively.

[0230] In the indoor unit 100, the refrigerant flows through the first heat exchanger 5, exchanging heat with the incoming air, transforming into a low-temperature, high-pressure, two-phase refrigerant. This low-temperature, high-pressure, two-phase refrigerant then flows to the expansion valve 9, where it is throttled and reduced in pressure, transforming into a low-temperature, low-pressure liquid refrigerant. The low-temperature, low-pressure liquid refrigerant then flows to the second heat exchanger 6, absorbing heat from the incoming air, transforming into a low-temperature, low-pressure gaseous refrigerant. Finally, the low-temperature, low-pressure gaseous refrigerant returns to the compressor 7 via the corresponding fourth port E and third port S of the four-way valve 8, completing one refrigerant cycle.

[0231] In some embodiments, when the humidity control multi-split unit 1000 operates in the second mode, the indoor unit 100 is further configured to switch to the second state when a third preset condition is met. Thus, by continuously switching the indoor unit 100 between the first and second states, the airflow direction of the fan is cyclically switched, thereby achieving humidification of the indoor air without requiring the damper switching device within the humidity control multi-split unit 1000. This simplifies the structure of the humidity control multi-split unit 1000 and reduces its size and manufacturing cost.

[0232] In some embodiments, the controller 110 is further configured to: when the humidity control multi-split unit 1000 operates in the first mode, control the opening of the expansion valve according to formula (8).

[0233] In formula (8), i = {1, 2, ..., m}; Tssh i is the superheat of the indoor unit corresponding to the expansion valve; AVERAGE is the average value of the superheat of multiple indoor units; Va is the standard opening degree of the indoor unit capacity.

[0234] For example, the controller 110 may control the opening degree V1 of the first expansion valve 91 corresponding to the first indoor unit 101 according to formula (9).

[0235] In formula (9), Tssh1 represents the superheat degree of the first indoor unit.

[0236] For example, the controller 110 may control the opening degree V2 of the second expansion valve 92 corresponding to the second indoor unit 102 according to formula (9).

[0237] In formula (10), Tssh2 represents the superheat degree of the second indoor unit.

[0238] For example, the controller 110 may control the opening degree V3 of the third expansion valve 93 corresponding to the third indoor unit 103 according to formula (9).

[0239] In formula (11), Tssh3 represents the superheat degree of the third indoor unit.

[0240] In some embodiments, the controller 110 is further configured to: when the humidity control multi-split unit 1000 operates in the second mode, control the opening of the expansion valve according to formula (12).

[0241] In formula (12), Vb represents the standard opening degree of the indoor unit capacity, and D is a constant.

[0242] It can be understood that the humidity control multi-split unit 1000 in some embodiments of the present disclosure can control the opening of multiple expansion valves separately through the superheat of multiple indoor units, thereby helping to improve the stability and reliability of the operation of the humidity control multi-split unit 1000.

[0243] In some embodiments, the controller 110 is further configured to: after the i-th indoor unit is turned on, calculate the difference Δdi between the fresh air absolute humidity doa and the indoor set humidity dsi, and obtain the switching time Ti of the four-way valve corresponding to the i-th indoor unit based on the difference Δdi and formula (12). The switching time Ti of the four-way valve corresponds to the state switching time of the indoor unit. Ti = Δdi × (x / y) (13)

[0244] In formula (13), x is the standard commutation time; y is a constant.

[0245] It is understandable that calculating the switching time of the four-way valve based on the difference Δdi between the fresh air absolute humidity doa and the indoor set humidity dsi is beneficial to improving the reliability of the dehumidification or humidification of the humidity-regulating multi-split unit 1000.

[0246] For example, the controller 110 is configured to: when the i-th indoor unit is turned on and receives an instruction to run the first mode, control the four-way valve 8-i corresponding to the i-th indoor unit to be in the second switching state, control the second fan 22 of the i-th indoor unit to rotate in the first direction, and control the first fan 21 to rotate in the second direction; and, when the first mode operation reaches the reversing time Ti, control the four-way valve 8-i to be in the first switching state, control the first fan 21 of the i-th indoor unit to slow down, and rotate to the target speed in the first direction while continuing t1, and the second fan 22 to slow down and rotate to the target speed in the second direction while continuing t2 (t1≤t2).

[0247] Similarly, the controller 110 is also configured to: when the i-th indoor unit is turned on and receives an instruction to run the second mode, control the four-way valve 8-i to be in the first switching state, control the second fan 22 of the i-th indoor unit to rotate in the first direction, and control the first fan 21 to rotate in the second direction; and when the second mode operation reaches the reversing time Ti, control the four-way valve 8-i to be in the second switching state, control the first fan 21 of the i-th indoor unit to slow down and rotate in the first direction to the target speed while continuing t1, and control the second fan 22 to slow down and rotate in the second direction to the target speed while continuing t2.

[0248] In some embodiments, referring to Figures 11 and 12, when the indoor unit switches from the second state to the first state, the four-way valve 8 is reversed, and the first fan 21 and the second fan 22 slow down. When the reversal of the four-way valve reaches t1 time, the first fan 21 changes its rotation direction and serves as a supply fan. When the reversal of the four-way valve 8 reaches t2 (t1≤t2) time, the second fan 22 changes its rotation direction and serves as an exhaust fan.

[0249] When the indoor unit switches from the first state to the second state, the four-way valve 8 reverses, and the first fan 21 and the second fan 22 slow down. When the reversal of the four-way valve 8 reaches t2 time, the first fan 21 changes its rotation direction and acts as an exhaust fan. When the reversal of the four-way valve reaches t1 time, the second fan 22 changes its rotation direction and acts as a supply fan.

[0250] It can be understood that by setting t1 to be less than or equal to t2, the supply fan will start no later than the exhaust fan after the indoor unit switches states, thereby ensuring that the fresh air volume is greater than or equal to the exhaust air volume, making the fresh air duct in a positive pressure state and the return air duct in a negative pressure state, thereby avoiding cross-talk between exhaust and fresh air, which is beneficial to improving the dehumidification and humidification effects of the humidity-regulating multi-split unit 1000.

[0251] Some embodiments of the present disclosure provide another multi-split humidity control system 1000. This system can switch wind direction by switching the airflow direction of the fan, thereby achieving both dehumidification and humidification functions. Furthermore, this system omits the third heat exchanger 10 and its associated structure, and can control the refrigerant flow direction via a four-way valve to achieve both heating and humidification functions. This further simplifies the structure of the multi-split humidity control system 1000 and helps reduce its size and manufacturing cost.

[0252] 13 , a humidity control multi-split unit 100 includes a first indoor unit 101, a second indoor unit 102, and a third indoor unit 103. The first indoor unit 101, the second indoor unit 102, and the third indoor unit 103 are connected to a refrigerant circuit of the humidity control multi-split unit 1000.

[0253] The three first heat exchangers 5 in the first indoor unit 101 , the second indoor unit 102 and the third indoor unit 103 are arranged in parallel, and the three second heat exchangers 6 in the first indoor unit 101 , the second indoor unit 102 and the third indoor unit 103 are arranged in parallel.

[0254] In some embodiments, as shown in FIG13 , the humidity control multi-split unit 100 further includes a compressor 7. The humidity control multi-split unit 100 further includes a four-way valve. The exhaust port of the compressor 7 is connected to the first port D of the four-way valve 8, and the intake port of the compressor 7 is connected to the third port S of the four-way valve 8.

[0255] In some embodiments, the humidity control multi-split unit 100 further includes an expansion valve 9, three first heat exchangers 5 are connected in parallel between the second port C of the four-way valve 8 and the first end of the expansion valve 9, and three second heat exchangers 6 are connected in parallel between the fourth port E of the four-way valve 8 and the second end of the expansion valve 9.

[0256] In some embodiments, the humidity control multi-split unit 100 further includes a fourth solenoid valve 201 , which is connected in series between the first heat exchanger 5 and the second heat exchanger 6 of the first indoor unit 101 .

[0257] In some embodiments, the humidity-control multi-split unit 100 further includes a fifth solenoid valve 202 , which is connected in series between the first heat exchanger 5 and the second heat exchanger 6 of the second indoor unit 102 .

[0258] In some embodiments, the humidity-control multi-split unit 100 further includes a sixth solenoid valve 203 , which is connected in series between the first heat exchanger 5 and the second heat exchanger 6 of the third indoor unit 103 .

[0259] In some embodiments, the humidity control multi-split unit 100 further includes a seventh solenoid valve 204 , which is connected in series between the fourth solenoid valve 201 and the second heat exchanger 6 of the first indoor unit 101 .

[0260] In some embodiments, the humidity control multi-split unit 100 further includes an eighth solenoid valve 205 , which is connected in series between the fifth solenoid valve 202 and the second heat exchanger 6 of the second indoor unit 102 .

[0261] In some embodiments, the humidity-control multi-split unit 100 further includes a ninth solenoid valve 206 , which is connected in series between the sixth solenoid valve 203 and the second heat exchanger 6 of the third indoor unit 103 .

[0262] For example, at least one of the fourth solenoid valve 201 , the fifth solenoid valve 202 , the sixth solenoid valve 203 , the seventh solenoid valve 204 , the eighth solenoid valve 205 , and the ninth solenoid valve 206 may be an electronic expansion valve.

[0263] In some embodiments, when the first heat exchanger 5 functions as an evaporator and the second heat exchanger 6 functions as a condenser, the fourth solenoid valve 201, the fifth solenoid valve 202, and the sixth solenoid valve 203 are configured to be fully open; the seventh solenoid valve 204, the eighth solenoid valve 205, and the ninth solenoid valve 206 are configured to regulate the flow rate of refrigerant flowing therethrough. For example, the opening degrees of the seventh solenoid valve 204, the eighth solenoid valve 205, and the ninth solenoid valve 206 can be controlled based on the superheat of the corresponding indoor unit, thereby regulating the refrigerant flow rate within the corresponding indoor unit.

[0264] When the first heat exchanger 5 functions as a condenser and the second heat exchanger 6 functions as an evaporator, the seventh solenoid valve 204, the eighth solenoid valve 205, and the ninth solenoid valve 206 are fully open. The fourth solenoid valve 201, the fifth solenoid valve 202, and the sixth solenoid valve 203 regulate the flow of refrigerant passing therethrough. For example, the opening degrees of the fourth solenoid valve 201, the fifth solenoid valve 202, and the sixth solenoid valve 203 can be controlled based on the superheat of the corresponding indoor unit, thereby regulating the refrigerant flow within the corresponding indoor unit.

[0265] In some embodiments, the humidity control multi-split unit 1000 is configured to operate in a first mode (summer dehumidification mode) to dehumidify the indoor air.

[0266] 13 , when the humidity-control multi-split unit 1000 operates in the first mode and the indoor unit 100 is in the second state, the first heat exchanger 5 is used as a condenser and the second heat exchanger 6 is used as an evaporator; the first fan 21 rotates in the second direction and is used as an exhaust fan, and the second fan 22 rotates in the first direction and is used as a supply fan; the first port D of the four-way valve 8 is connected to the second port C, and the fourth port E is connected to the third port S.

[0267] In this case, fresh air enters the second passage 17 through the second air outlet 12. Driven by the second fan 22, it is filtered by the second filter element 4 and then undergoes heat exchange with the second heat exchanger 6, thereby reducing its temperature and cooling. During the cooling process, moisture in the fresh air is adsorbed by the adsorbent on the surface of the second heat exchanger 6, thereby reducing the humidity of the fresh air. The fresh air with reduced humidity then enters the room through the fourth air outlet 14.

[0268] In addition, indoor return air enters the first passage 16 through the third air outlet 13. Driven by the first fan 21, it exchanges heat with the first heat exchanger 5 to increase its temperature and remove moisture from the adsorbent. The moisture-laden return air is then filtered by the first filter element 3 before being discharged outdoors through the first air outlet 11.

[0269] Hereinafter, the refrigerant circulation when the humidity control multi-split machine 1000 operates in the first mode and the indoor units 100 are in the second state will be described.

[0270] 13 , the exhaust port of the compressor 7 delivers high-temperature and high-pressure refrigerant to the four-way valve 8 , which is then diverted to the three indoor units 100 via the four-way valve 8 , and the flow of the refrigerant is controlled by the fourth solenoid valve 201 , the fifth solenoid valve 202 , and the sixth solenoid valve 203 , respectively.

[0271] In the indoor unit 100, the refrigerant flows through the first heat exchanger 5 to exchange heat with the return air flowing through the first heat exchanger 5, becoming a low-temperature, high-pressure two-phase refrigerant. The low-temperature, high-pressure two-phase refrigerant then flows to the expansion valve 9, where it is throttled and reduced in pressure, becoming a low-temperature, low-pressure liquid refrigerant. The low-temperature, low-pressure liquid refrigerant then flows through fully open solenoid valves (such as the seventh solenoid valve 204, the eighth solenoid valve 205, and the ninth solenoid valve 206) to the second heat exchanger 6, where it absorbs heat from the fresh air flowing through the second heat exchanger 6 and becomes a low-temperature, low-pressure gaseous refrigerant. Finally, the low-temperature, low-pressure gaseous refrigerant returns to the compressor 7 via the corresponding fourth port E and third port S of the four-way valve 8, completing one refrigerant cycle.

[0272] In some embodiments, when the humidity control multi-split unit 1000 operates in the first mode, the indoor unit 100 is further configured to switch to the first state when a second preset condition is met.

[0273] 14 , when the humidity-control multi-split unit 1000 operates in the first mode and the indoor unit 100 is in the first state, the four-way valve 8 is reversed, the first heat exchanger 5 is used as an evaporator, and the second heat exchanger 6 is used as a condenser; the first fan 21 rotates in the first direction and is used as a supply fan; the second fan 22 rotates in the second direction and is used as an exhaust fan; the first port D of the four-way valve 8 is connected to the fourth port E, and the second port C is connected to the third port S.

[0274] In this case, fresh air enters the first passage 16 through the first air outlet 11. Driven by the first fan 21, it is filtered by the first filter element 3 and then undergoes heat exchange with the first heat exchanger 5, thereby reducing its temperature and cooling. During the cooling process, moisture in the fresh air is adsorbed by the adsorbent on the surface of the first heat exchanger 5, thereby reducing the humidity of the fresh air. The fresh air with reduced humidity then enters the room through the third air outlet 13.

[0275] In addition, indoor return air enters the second passage 17 through the fourth air outlet 14. Driven by the second fan 22, it exchanges heat with the second heat exchanger 6 to increase its temperature and remove moisture from the adsorbent. The moisture-laden return air is then filtered by the second filter element 4 before being discharged outdoors through the second air outlet 12.

[0276] Hereinafter, the refrigerant circulation when the humidity control multi-split machine 1000 operates in the first mode and the indoor units 100 are in the first state will be described.

[0277] 14 , the exhaust port of the compressor 7 delivers high-temperature and high-pressure refrigerant to the four-way valve 8 , and is diverted to the three indoor units 100 via the four-way valve 8 , and the flow of the refrigerant is controlled by the seventh solenoid valve 204 , the eighth solenoid valve 205 , and the ninth solenoid valve 206 , respectively.

[0278] In the indoor unit 100, the refrigerant flows through the second heat exchanger 6 to exchange heat with the return air flowing through the second heat exchanger 6, becoming a low-temperature, high-pressure two-phase refrigerant. The low-temperature, high-pressure two-phase refrigerant then flows to the expansion valve 9, where it is throttled and reduced in pressure, becoming a low-temperature, low-pressure liquid refrigerant. The low-temperature, low-pressure liquid refrigerant then flows through fully open solenoid valves (such as the fourth solenoid valve 201, the fifth solenoid valve 202, and the sixth solenoid valve 203) to the first heat exchanger 5, where it absorbs heat from the fresh air flowing through the first heat exchanger 5 and becomes a low-temperature, low-pressure gaseous refrigerant. Finally, the low-temperature, low-pressure gaseous refrigerant returns to the compressor 7 via the corresponding second port C and third port S of the four-way valve 8, completing one refrigerant cycle.

[0279] In some embodiments, when the humidity control multi-split unit 1000 operates in the first mode, the indoor unit 100 is further configured to switch to the second mode when a first preset condition is met. Thus, by cyclically switching the indoor unit 100 between the first and second modes, the airflow direction of the fan cyclically switches, thereby achieving dehumidification of the indoor air without requiring the damper switching device within the humidity control multi-split unit 1000. This simplifies the structure of the humidity control multi-split unit 1000 and reduces its size and manufacturing cost.

[0280] In some embodiments, the humidity control multi-split unit 1000 is configured to operate in a second mode (winter humidification mode) to humidify the indoor air.

[0281] 13 , when the humidity-control multi-split unit 1000 operates in the second mode and the indoor unit 100 is in the second state, the first heat exchanger 5 is used as an evaporator and the second heat exchanger 6 is used as a condenser; the first fan 21 rotates in the second direction and is used as an exhaust fan, and the second fan 22 rotates in the first direction and is used as a supply fan; the first port D of the four-way valve 8 is connected to the fourth port E, and the second port C is connected to the third port S.

[0282] In this case, fresh air enters the second passage 17 through the second air outlet 12. Driven by the second fan 22, it is filtered by the second filter element 4 and then undergoes heat exchange with the second heat exchanger 6, thereby being heated. The heated fresh air then removes moisture stored in the adsorbent on the surface of the second heat exchanger 6, increasing the humidity, and then enters the room through the fourth air outlet 14.

[0283] Furthermore, indoor return air enters the first passage 16 through the third air outlet 13. Driven by the first fan 21, it exchanges heat with the first heat exchanger 5 to reduce its temperature. In this process, moisture carried by the return air is precipitated and adsorbed and stored by the adsorbent on the surface of the first heat exchanger 5. The reduced-humidity return air is then filtered by the first filter element 3 and discharged outdoors through the first air outlet 11.

[0284] Hereinafter, the refrigerant circulation when the humidity control multi-split machine 1000 operates in the second mode and the indoor units 100 are in the second state will be described.

[0285] 13 , the exhaust port of the compressor 7 delivers high-temperature and high-pressure refrigerant to the four-way valve 8 , which is then diverted to the three indoor units 100 via the four-way valve 8 , and the flow of the refrigerant is controlled by the seventh solenoid valve 204 , the eighth solenoid valve 205 , and the ninth solenoid valve 206 , respectively.

[0286] In the indoor unit 100, the refrigerant flows through the second heat exchanger 6 to exchange heat with the fresh air flowing through it, transforming into a low-temperature, high-pressure, two-phase refrigerant. The low-temperature, high-pressure, two-phase refrigerant then flows to the expansion valve 9, where it is throttled and reduced in pressure, transforming into a low-temperature, low-pressure liquid refrigerant. The low-temperature, low-pressure liquid refrigerant then flows through fully open solenoid valves (such as the fourth solenoid valve 201, the fifth solenoid valve 202, and the sixth solenoid valve 203) to the first heat exchanger 5, where it absorbs heat from the return air flowing through the first heat exchanger 5 and transforms into a low-temperature, low-pressure gaseous refrigerant. Finally, the low-temperature, low-pressure gaseous refrigerant returns to the compressor 7 via the corresponding second port C and third port S of the four-way valve 8, completing one refrigerant cycle.

[0287] In some embodiments, when the humidity control multi-split unit 1000 operates in the first mode, the indoor unit 100 is further configured to switch to the first state when a fourth preset condition is met.

[0288] 14 , when the humidity-control multi-split unit 1000 operates in the second mode and the indoor unit 100 is in the first state, the four-way valve 8 is reversed, the first heat exchanger 5 is used as a condenser, and the second heat exchanger 6 is used as an evaporator; the first fan 21 rotates in the first direction and is used as a supply fan; the second fan 22 rotates in the second direction and is used as an exhaust fan; the first port D of the four-way valve 8 is connected to the second port C, and the fourth port E is connected to the third port S.

[0289] In this case, fresh air enters the first passage 16 through the first air outlet 11. Driven by the first fan 21, it is filtered by the first filter element 3 and then undergoes heat exchange with the first heat exchanger 5, thereby being heated. The heated fresh air removes moisture from the adsorbent on the first heat exchanger 5, and after increasing its humidity, it enters the room through the third air outlet 13.

[0290] In addition, indoor return air enters the second passage 17 through the fourth air outlet 14. Driven by the second fan 22, it exchanges heat with the second heat exchanger 6, thereby being cooled and reduced in temperature. During this cooling process, moisture in the return air is adsorbed by the adsorbent on the surface of the second heat exchanger 6. The cooled and dehumidified return air is then filtered by the second filter element 4 and discharged outdoors through the second air outlet 12.

[0291] Hereinafter, the refrigerant circulation when the humidity control multi-split machine 1000 operates in the second mode and the indoor units 100 are in the first state will be described.

[0292] 14 , the exhaust port of the compressor 7 delivers high-temperature and high-pressure refrigerant to the four-way valve 8 , which is then diverted to the three indoor units 100 via the four-way valve 8 , and the flow of the refrigerant is controlled by the fourth solenoid valve 201 , the fifth solenoid valve 202 , and the sixth solenoid valve 203 , respectively.

[0293] In the indoor unit 100, the refrigerant flows through the first heat exchanger 5 to exchange heat with the fresh air flowing through it, becoming a low-temperature, high-pressure, two-phase refrigerant. The low-temperature, high-pressure, two-phase refrigerant then flows to the expansion valve 9, where it is throttled and reduced in pressure, becoming a low-temperature, low-pressure liquid refrigerant. The low-temperature, low-pressure liquid refrigerant then flows through fully open solenoid valves (such as the seventh solenoid valve 204, the eighth solenoid valve 205, and the ninth solenoid valve 206) to the second heat exchanger 6, where it absorbs heat from the fresh air flowing through it and becomes a low-temperature, low-pressure gaseous refrigerant. Finally, the low-temperature, low-pressure gaseous refrigerant returns to the compressor 7 via the corresponding fourth port E and third port S of the four-way valve 8, completing one refrigerant cycle.

[0294] In some embodiments, when the humidity control multi-split unit 1000 operates in the second mode, the indoor unit 100 is further configured to switch to the second state when a third preset condition is met. Thus, by continuously switching the indoor unit 100 between the first and second states, the airflow direction of the fan is cyclically switched, thereby achieving humidification of the indoor air without requiring the damper switching device within the humidity control multi-split unit 1000. This simplifies the structure of the humidity control multi-split unit 1000 and reduces its size and manufacturing cost.

[0295] In some embodiments, when the humidity control multi-split unit 1000 operates in the first mode, the frequency of the compressor can be calculated using formula (14).

[0296] In formula (14), A, B, and n are constants; and C is the correction coefficient.

[0297] For example, A = 10, B = 60, n = 2; the value of C depends on the difference between doa and ds. When 20g ≤ doa-ds, the value of C is ds–doa; when 8g ≤ doa-ds < 20g, the value of C is When doa-ds<8g, the value of C is

[0298] In some embodiments, when the humidity control multi-split unit 1000 operates in the second mode, the frequency of the compressor can be calculated using formula (15).

[0299] In formula (14), A and n are constants; B and C are correction coefficients.

[0300] For example, the value of B depends on the value of Toa. When Toa is any value between -1°C and 1°C (including -1°C and 1°C), the value of B is 1; when Toa is any value outside -1°C to 1°C, the value of B is

[0301] For example, the value of C depends on the difference between ds and doa, as well as the value of Toa. For example, when 8g ≤ ds - doa, and Toa ≤ 0°C, the value of C is ds - doa. When 4g ≤ ds - doa < 8g, and Toa > 0°C, the value of C is 0. When ds - doa < 4g, the value of Toa does not limit the value of C, and the value of C is doa - ds.

[0302] It can be understood that formulas (14) and (15) are fitted by the humidity control (dehumidification or humidification) amount and outdoor temperature of the humidity control multi-split unit 1000 operating in the first mode or the second mode under different working conditions. Therefore, the compressor can operate at a corresponding frequency according to different humidity control requirements, thereby improving the reliability of the compressor operation and helping to reduce the energy consumption of the humidity control multi-split unit 1000.

[0303] In addition, the fresh air temperature Toa is introduced into formulas (14) and (15). When Toa ≤ 0°C, the compressor can reduce the frequency, thereby preventing frost and ice from forming due to the evaporation temperature being too low, which is beneficial to improving the reliability and stability of the humidity control multi-split unit 1000.

[0304] It should be noted that any one of the technical solutions disclosed in the present disclosure can solve one or more of the above-mentioned technical problems and achieve certain invention purposes to a certain extent; multiple technical disclosures can also be combined into an overall solution to solve one or more of the above-mentioned technical problems and achieve certain invention purposes; some of the technical disclosures can also be selected to combine into an overall solution, while adopting related technologies and deteriorated solutions, but the deterioration trend can be compensated by the means disclosed in this technology, and the above-mentioned one or more technical problems can be solved to a certain extent as a whole and certain invention purposes can be achieved; each technical disclosure combined into a complete technical solution constitutes an organic and inseparable overall solution, which solves technical problems as a whole and achieves certain invention purposes.

[0305] Any technical disclosure in this disclosure, as well as the recombination of multiple technical disclosures, can form a complete technical solution and can solve one or more of the above-mentioned technical problems and achieve the purpose of the invention. They all belong to the content of this disclosure and are the content that is directly and unambiguously determined based on the content of this disclosure.

[0306] The above description is merely a specific embodiment of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Any changes or substitutions that a person skilled in the art can conceive within the technical scope disclosed in the present disclosure should be included within the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims.

Claims

1. A humidity control multi-split unit, comprising a plurality of indoor units, wherein any one of the plurality of indoor units is configured to switch between a first state and a second state, and comprises: A first channel, wherein the first channel connects indoor and outdoor; a second passage, the second passage connecting indoor and outdoor; a first fan, disposed in the first channel; a second fan, disposed in the second channel; A first heat exchanger is disposed in the first channel; a second heat exchanger, disposed in the second channel and connected to the first heat exchanger; and a plurality of adsorbents disposed on surfaces of the first heat exchanger and the second heat exchanger and configured to adsorb moisture from the air flowing therethrough or release the stored moisture to the air flowing therethrough; Wherein, when the indoor unit is in the first state, the first fan rotates in the first direction so that fresh air flows into the room through the first channel; the fresh air exchanges heat with the first heat exchanger in the first channel so that the adsorbent on the surface of the first heat exchanger adsorbs moisture in the fresh air or releases stored moisture to the fresh air; and The second fan rotates in the second direction to make the return air flow to the outside through the second channel; the return air exchanges heat with the second heat exchanger in the second channel, so that the adsorbent on the surface of the second heat exchanger releases stored moisture to the return air, or adsorbs moisture in the return air; Wherein, when the indoor unit is in the second state, the first fan rotates in the second direction, so that the return air flows to the outdoors through the first channel; the return air exchanges heat with the first heat exchanger in the first channel, so that the adsorbent on the surface of the first heat exchanger releases stored moisture to the return air, or adsorbs moisture in the return air; The second fan rotates along the first direction, so that the fresh air flows into the room through the second channel; the fresh air exchanges heat with the second heat exchanger in the second channel, so that the adsorbent on the surface of the second heat exchanger adsorbs moisture in the fresh air, or releases stored moisture to the fresh air.

2. The humidity control multi-split unit according to claim 1, wherein: Also includes: A compressor, including an exhaust port and an intake port; as well as a plurality of four-way valves corresponding to the plurality of indoor units; Any one of the indoor units is connected to the exhaust port and the air intake port of the compressor via a corresponding four-way valve; Wherein, the four-way valve is configured to switch to a first switching state so that the exhaust port is connected to the first heat exchanger and the intake port is connected to the second heat exchanger; and to switch to a second switching state so that the exhaust port is connected to the second heat exchanger and the intake port is connected to the first heat exchanger.

3. The humidity control multi-split unit according to claim 2, wherein: The humidity control multi-split unit is configured to operate in a first mode; When the humidity control multi-split unit operates in the first mode and the indoor unit is in the first state, the plurality of four-way valves are in the second switching state, the first heat exchanger is used as an evaporator, and the second heat exchanger is used as a condenser; The first fan rotates along the first direction; the second fan rotates along the second direction; The fresh air enters the first channel under the drive of the first fan and performs heat exchange with the first heat exchanger, so that the fresh air is cooled and moisture is precipitated; the adsorbent on the surface of the first heat exchanger is configured to adsorb moisture precipitated by the fresh air; The return air enters the second channel under the driving of the second fan and performs heat exchange with the second heat exchanger, so that the return air is heated and takes away the moisture stored in the adsorbent.

4. The humidity control multi-split unit according to claim 2 or 3, wherein: The humidity control multi-split unit is configured to operate in a first mode; When the humidity control multi-split unit operates in the first mode and the indoor unit is in the second state, the plurality of four-way valves are in the first switching state, the first heat exchanger is used as a condenser, and the second heat exchanger is used as an evaporator; The first fan rotates along the second direction; the second fan rotates along the first direction; The fresh air enters the second channel under the drive of the second fan and performs heat exchange with the second heat exchanger, so that the fresh air is cooled and moisture is precipitated; the adsorbent on the surface of the second heat exchanger is configured to adsorb moisture precipitated by the fresh air; The return air enters the first channel under the drive of the first fan and performs heat exchange with the first heat exchanger, so that the return air is heated and takes away the moisture stored in the adsorbent.

5. The humidity control multi-split unit according to any one of claims 2 to 4, wherein: The humidity control multi-split unit is configured to operate in a second mode; When the humidity control multi-split system operates in the second mode and the indoor unit is in the first state, the plurality of four-way valves are in the first state. In the first switching state, the first heat exchanger is used as a condenser and the second heat exchanger is used as an evaporator; The first fan rotates along the first direction; the second fan rotates along the second direction; The fresh air enters the first channel under the drive of the first fan and performs heat exchange with the first heat exchanger, so that the fresh air is heated and takes away the moisture stored in the adsorbent; The return air enters the second channel driven by the second fan and exchanges heat with the second heat exchanger to cool the return air and precipitate moisture; the adsorbent on the surface of the second heat exchanger is configured to adsorb moisture precipitated from the return air.

6. The humidity control multi-split unit according to any one of claims 2 to 5, wherein: The humidity control multi-split unit is configured to operate in a second mode; When the humidity control multi-split unit operates in the second mode and the indoor unit is in the second state, the plurality of four-way valves are in the second switching state, the first heat exchanger is used as an evaporator, and the second heat exchanger is used as a condenser; The first fan rotates along the second direction; the second fan rotates along the first direction; The fresh air enters the second channel under the drive of the second fan and performs heat exchange with the second heat exchanger, so that the fresh air is heated and takes away the moisture stored in the adsorbent; The return air enters the first channel driven by the first fan and exchanges heat with the first heat exchanger to cool the return air and precipitate moisture; the adsorbent on the surface of the first heat exchanger is configured to adsorb moisture precipitated from the return air.

7. The humidity control multi-split unit according to any one of claims 1 to 6, wherein: Any one of the indoor units further comprises: a first filter element, disposed in the first channel and configured to filter air flowing through the first channel; and The second filter element is disposed in the second channel and is configured to filter the air flowing through the second channel.

8. The humidity-control multi-split unit according to any one of claims 2 to 7, further comprising at least one expansion valve; the at least one expansion valve is disposed between the first heat exchanger and the second heat exchanger and is configured to adjust the flow rate of the refrigerant flowing therethrough.

9. The humidity control multi-split unit according to claim 8, wherein: The at least one expansion valve includes an expansion valve; a first end of the expansion valve is connected to a first heat exchanger in the plurality of indoor units, and a second end of the expansion valve is connected to a second heat exchanger in the plurality of indoor units.

10. The humidity control multi-split unit according to claim 8, wherein: The at least one expansion valve includes a plurality of expansion valves; the plurality of expansion valves correspond to the plurality of indoor units; any one of the plurality of expansion valves is disposed between the first heat exchanger and the second heat exchanger of the corresponding indoor unit.

11. The humidity control multi-split unit according to any one of claims 2 to 10, further comprising: a third heat exchanger connected in series between the exhaust port and the plurality of four-way valves and configured to perform heat exchange with the air flowing therethrough to improve the humidity control capability of the humidity control multi-split unit; as well as The reversing valve is disposed between the exhaust port and the third heat exchanger and is configured to switch to an open state to connect the exhaust port with the third heat exchanger, or to switch to a closed state to disconnect the exhaust port with the third heat exchanger.

12. The humidity control multi-split unit according to claim 11, wherein: The third heat exchanger satisfies at least one of the following conditions: When the humidity control multi-split unit operates in the first mode, the third heat exchanger is used as a condenser; or, When the humidity control multi-split unit operates in the second mode, the third heat exchanger is used as an evaporator.

13. The humidity control multi-split unit according to claim 11 or 12, wherein: Also includes: a first solenoid valve, connected in series between the exhaust port and the plurality of four-way valves, and arranged in parallel with the third heat exchanger; a one-way valve connected in series between the third heat exchanger and the plurality of four-way valves; a second solenoid valve, a first end of the second solenoid valve being connected to the plurality of four-way valves, and a second end of the second solenoid valve being connected to the third heat exchanger and the one-way valve; and a third solenoid valve connected in series between the plurality of four-way valves and the air intake port; The first solenoid valve, the second solenoid valve and the third solenoid valve are configured to open or close a flow path of the refrigerant.

14. The humidity control multi-split unit according to claim 13, wherein: Also included is a controller configured to: When it is determined that the first condition or the second condition is satisfied, the first solenoid valve and the second solenoid valve are controlled to be closed, the third solenoid valve is controlled to be opened, and the reversing valve is controlled to be switched to the open state; and When it is determined that the first condition and the second condition are not met, the first solenoid valve and the third solenoid valve are controlled to be opened, the second solenoid valve is controlled to be closed, and the reversing valve is controlled to be in the closed state.

15. The humidity control multi-split unit according to claim 14, wherein: The first condition includes that the exhaust pressure of the compressor is greater than or equal to a first preset value; the second condition includes that the difference between the absolute humidity of the outdoor fresh air and the absolute humidity set indoors is greater than or equal to a second preset value.

16. The humidity control multi-split unit according to any one of claims 13 to 15, wherein: Also included is a controller configured to: When it is determined that the third condition or the fourth condition is met, the first solenoid valve and the second solenoid valve are controlled to be opened, the third solenoid valve is controlled to be closed, and the reversing valve is controlled to switch to the open state; and When it is determined that the third condition and the fourth condition are not satisfied, the first solenoid valve and the third solenoid valve are controlled to be opened, the second solenoid valve is controlled to be closed, and the reversing valve is controlled to be in the open state.

17. The humidity control multi-split unit according to claim 16, wherein: The third condition includes that the exhaust pressure of the compressor is less than a third preset value; the fourth condition includes that the difference between the absolute humidity of the outdoor fresh air and the absolute humidity set indoors is less than or equal to a fourth preset value.

18. The humidity control multi-split unit according to any one of claims 1 to 17, further comprising: compressor; The first sensor is configured to detect fresh air temperature and fresh air humidity; as well as a controller coupled to the compressor and the first sensor, and configured to: When the humidity-control multi-split unit operates in the first mode, the absolute humidity of the outdoor fresh air is calculated according to the fresh air temperature and the fresh air humidity detected by the first sensor; as well as The frequency of the compressor is adjusted according to the difference between the absolute humidity of the outdoor fresh air and the set indoor absolute humidity, the first parameter and the first corresponding relationship.

19. The humidity control multi-split unit according to any one of claims 1 to 18, further comprising: compressor; The first sensor is configured to detect fresh air temperature and fresh air humidity; as well as a controller coupled to the compressor and the first sensor, and configured to: When the humidity-control multi-split system operates in the second mode, the absolute humidity of the outdoor fresh air is calculated according to the fresh air temperature and the fresh air humidity detected by the first sensor; as well as The frequency of the compressor is adjusted according to the fresh air temperature, the difference between the set indoor absolute humidity and the absolute humidity of the outdoor fresh air, the first parameter and the second corresponding relationship.

20. The humidity control multi-split unit according to claim 18 or 19, wherein: The first parameter is a ratio of a first air volume to a second air volume of the fan; or, the first parameter is a ratio of the number of turned-on indoor units to the total number of indoor units.

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