Fresh air humidity control multi-connection

Abstract

The present application discloses a fresh air humidity control multi-split unit, which belongs to the field of air treatment technology. It comprises: m humidity control units; the humidity control unit comprises: a first air duct and a second air duct; a first fan is arranged in the first air duct, and a second fan is arranged in the second air duct; a first heat exchanger and a second heat exchanger, both of which are coated with adsorption materials, the first heat exchanger is arranged in the first air duct, and the second heat exchanger is arranged in the second air duct; in the first state, the return air flows to the outside through the first air duct; the fresh air flows to the room through the second air duct; in the second state, the first fan changes direction, and the fresh air flows to the room through the first air duct; the second fan changes direction, and the return air flows to the outside through the second air duct; the humidity control unit also comprises: a refrigerant circuit having a four-way valve, a first heat exchanger, an electronic expansion valve and a second heat exchanger; the refrigerant circuits of the m humidity control units share a compressor. This fresh air humidity control multi-split unit achieves continuous dehumidification and humidification by rotating the fan forward and reverse, without the need for a valve switching device.

Description

Technical Field

[0001] The present application relates to the field of air treatment technology, and in particular to a fresh air humidity control multi-split unit. Background Art

[0002] Fresh air humidifiers are mainly used to introduce humidified fresh air into the room to regulate the indoor air. During summer dehumidification, the fresh air is cooled by the evaporator, and the moisture it carries is adsorbed on the adsorption material to dehumidify the fresh air; under certain conditions, the air duct is switched, the evaporator becomes a condenser, and the indoor return air is heated by the condenser, and then the moisture inside the adsorption material is dried out and taken away; during winter moisturizing, the principle is the opposite, the indoor return air is cooled by the evaporator, and the moisture it carries is adsorbed on the adsorption material for storage; under certain conditions, the air duct is switched, the evaporator becomes a condenser, and the fresh air is heated by the condenser, and the moisture on the adsorption material is dried out and sent to the room to humidify the fresh air;

[0003] In the above-mentioned fresh air humidifier, two air valve switching devices are required to switch the air duct, and the air valve switching devices are usually complex in structure and large in size. Summary of the Invention

[0004] The present application provides a fresh air humidity control multi-split unit, which realizes continuous dehumidification and humidification through the forward and reverse rotation of the fan, without the need for an air valve switching device.

[0005] A fresh air humidity control multi-split unit includes: m humidity control units, where m is greater than or equal to 2; the humidity control units include: a first air duct and a second air duct, each connecting indoors and outdoors; a first fan and a second fan, the first fan being disposed in the first air duct and the second fan being disposed in the second air duct; a first heat exchanger and a second heat exchanger, both coated with an adsorption material, the first heat exchanger being disposed in the first air duct and the second heat exchanger being disposed in the second air duct; the humidity control units can switch between a first state and a second state;

[0006] In the first state, the first fan is used as an exhaust fan, so that the return air flows to the outside through the first air duct; the second fan is used as a supply fan, so that the fresh air flows to the room through the second air duct;

[0007] When the first state changes to the second state, the first fan changes its direction and acts as a supply fan, so that fresh air flows into the room through the first air duct; the second fan changes its direction and acts as an exhaust fan, so that return air flows into the room through the second air duct;

[0008] The humidity control unit further includes: a refrigerant circuit having a four-way valve, a first heat exchanger, an electronic expansion valve and a second heat exchanger; the refrigerant circuits of the m humidity control units share a compressor.

[0009] In some embodiments, an outdoor unit and an indoor unit are included, a compressor and m four-way valves are located in the outdoor unit, and other components are located in the indoor unit.

[0010] In some embodiments, in dehumidification mode, the opening degree of the electronic expansion valve is calculated according to the following formula:

[0011]

[0012] Wherein, i = {1, 2, ..., m};

[0013] Tssh i Indicates the superheat of the humidity control unit where the target electronic expansion valve is located;

[0014] AVERAGE represents the average value of superheat of all humidity control units;

[0015] V0 represents the standard opening of the humidity control unit capacity.

[0016] In some embodiments, in humidification mode, the opening of the electronic expansion valve is calculated according to the following formula:

[0017]

[0018] Wherein, i = {1, 2, ..., m};

[0019] Tssh i Indicates the superheat of the humidity control unit where the target electronic expansion valve is located;

[0020] AVERAGE represents the average value of superheat of all humidity control units;

[0021] V1 represents the standard opening of the humidity control unit capacity;

[0022] D is a constant.

[0023] In some embodiments, it also includes: a temperature and humidity sensor for detecting the temperature Toa and humidity Hoa of the outdoor fresh air; a controller for calculating the absolute humidity doa of the outdoor fresh air based on Toa and Hoa, and controlling the frequency Fx1 of the compressor based on the difference between doa and the indoor set absolute humidity ds.

[0024] In some embodiments, in dehumidification mode,

[0025]

[0026] Among them, A, B, C, and n are constants;

[0027] Q is the set air volume, M is the maximum air volume; or, Q is the number of humidity control units turned on, M is the total number of humidity control units.

[0028] In some embodiments, in humidification mode,

[0029]

[0030] Among them, Toa represents the temperature of outdoor fresh air;

[0031] A1, B1, C1, and n1 are constants;

[0032] Q is the set air volume, M is the maximum air volume; or, Q is the number of humidity control units turned on, M is the total number of humidity control units.

[0033] In some embodiments, the system further includes: a temperature and humidity sensor for detecting the temperature Toa and humidity Hoa of the outdoor fresh air; a controller for calculating, after the i-th humidity control unit is powered on, the absolute humidity doa of the outdoor fresh air based on Toa and Hoa, and the difference Δdi between the absolute humidity doa of the fresh air and the set indoor humidity dsi; and obtaining the switching time Ti of the four-way valve of the i-th humidity control unit according to the following formula:

[0034] Ti = Δdi × (x / y);

[0035] Where x is the standard commutation time and y is a constant.

[0036] In some embodiments, the controller is also used to: after the i-th humidity control unit is turned on, control the humidity control unit to operate in a first state; when the humidity control unit runs for Ti time, the four-way valve is reversed, the first fan and the second fan change direction, and the humidity control unit operates in a second state.

[0037] In some embodiments, when the first state changes to the second state, the four-way valve is reversed, and the first fan and the second fan are decelerated at the same time. The first fan changes direction after the deceleration lasts for t1 time, and the second fan changes direction after the deceleration lasts for t2 time.

[0038] When the second state changes to the first state, the four-way valve reverses, and the first fan and the second fan slow down at the same time. The first fan changes direction after the speed reduction lasts for t2 time, and the second fan changes direction after the speed reduction lasts for t1 time; where t1≤t2. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A schematic diagram of a humidity control unit in a fresh air humidity control multi-split system according to some embodiments is shown;

[0040] Figure 2 A schematic diagram showing a humidity control unit in a fresh air humidity control multi-split system in a first state according to some embodiments is shown;

[0041] Figure 3 A schematic diagram showing a humidity control unit in a fresh air humidity control multi-split system in a second state according to some embodiments is shown;

[0042] Figure 4 A schematic diagram of a fresh air humidity control multi-split system in a first state according to some embodiments is shown;

[0043] Figure 5 A schematic diagram of a fresh air humidity control multi-split system in a second state according to some embodiments is shown;

[0044] Figure 6 A timing diagram of a fresh air humidity control multi-split system in a dehumidification mode according to some embodiments is shown;

[0045] Figure 7 A timing diagram of a fresh air humidity control multi-split system in a humidification mode according to some embodiments is shown;

[0046] In the above figures: 100, humidity control unit; 101, first humidity control unit; 102, second humidity control unit; 103, third humidity control unit; 1, shell; 11, first outdoor air outlet; 12, second outdoor air outlet; 13, first indoor air outlet; 14, second indoor air outlet; 21, first fan; 22, second fan; 3, first filter; 4, second filter; 5, first heat exchanger; 6, second heat exchanger; 7, compressor; 8, four-way valve; 9, electronic expansion valve; 10, check valve. DETAILED DESCRIPTION

[0047] In order to make the purpose and implementation of this application clearer, the exemplary implementation of this application will be clearly and completely described below in conjunction with the drawings in the exemplary embodiments of this application. Obviously, the described exemplary embodiments are only part of the embodiments of this application, not all of the embodiments.

[0048] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0049] 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, features specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0050] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0051] The following describes the embodiments of the present application in detail with reference to the accompanying drawings.

[0052] According to the implementation manner of the present application, the fresh air humidity control multi-split system includes m humidity control units, where m is a positive integer ≥ 2.

[0053] The following is an introduction to the humidity control unit:

[0054] Reference Figures 1 to 3 The humidity control unit includes a housing 1. The housing 1 forms the general appearance of the humidity control unit and is generally rectangular in shape. Four air vents are provided on the sidewalls of the housing 1, namely a first outdoor air vent 11, a second outdoor air vent 12, a first indoor air vent 13, and a second indoor air vent 14.

[0055] The first outdoor air outlet 11 and the second outdoor air outlet 12 are connected to the outside through air ducts respectively, serving as the inlet of fresh air or the outlet of return air, and the first indoor air outlet 13 and the second indoor air outlet 14 are connected to the room through air ducts respectively, serving as the outlet of fresh air or the inlet of return air.

[0056] The air duct in the shell 1 is separated by a partition, and the air duct includes a first air duct and a second air duct. The first outdoor air outlet 11 and the first indoor air outlet 13 are connected to form the first air duct, and the second outdoor air outlet 12 and the second indoor air outlet 14 are connected to form the second air duct.

[0057] The humidity control unit further includes a first fan 21 and a second fan 22 . The first fan 21 is disposed in the first air duct, and the second fan 22 is disposed in the second air duct.

[0058] In the first state, in the first air duct, the first fan 21 rotates in reverse, and the indoor return air enters the first air duct from the first indoor air outlet 13 and is discharged to the outside through the first outdoor air outlet 11;

[0059] In the second air duct, the second fan 22 rotates forward, and outdoor fresh air enters the second air duct from the second outdoor air outlet 12 and is sent to the room through the second indoor air outlet 14.

[0060] At this time, the first fan 21 is used as an exhaust fan, and the first air duct is used as a return air duct; the second fan 22 is used as a supply fan, and the second air duct is used as a fresh air duct.

[0061] In the second state, in the first air duct, the first fan 21 rotates forward, and the outdoor fresh air enters the first air duct from the first outdoor air outlet 11 and is sent to the room through the first indoor air outlet 13; in the second air duct, the second fan 22 rotates reversely, and the indoor return air enters the second air duct from the second indoor air outlet 14 and is discharged to the outside through the second outdoor air outlet 12.

[0062] At this time, the first fan 21 is used as a fresh air fan, and the first air duct is used as a fresh air duct; the second fan 22 is used as an exhaust fan, and the second air duct is used as a return air duct.

[0063] It should be noted that in this application, the forward and reverse rotation of the fan only refers to the opposite direction of rotation, and does not specifically refer to the forward and reverse rotation of the fan in actual working conditions.

[0064] Compared with the problems of complex structure and large volume caused by changing the air duct through two air valve switching devices in the prior art, the humidity control unit of the present application uses the forward and reverse rotation of the fan to achieve the conversion of the fresh air duct and the return air duct, omits the air valve switching device, simplifies the product structure, reduces costs, and makes the product smaller, saving space.

[0065] In addition, the omission of the air valve switching device reduces the internal resistance of the unit, improves the working efficiency of the unit, and reduces energy consumption.

[0066] According to an embodiment of the present application, the humidity control unit further includes a first heat exchanger 5 and a second heat exchanger 6. The first heat exchanger 5 is disposed within the first air duct, and the second heat exchanger 6 is disposed within the second air duct. Both the first heat exchanger 5 and the second heat exchanger 6 are coated with an adsorbent material. 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.

[0067] The heat exchanger, acting as an evaporator, cools the air and dries it by absorbing water through the adsorption action of the adsorbent material. The heat exchanger, acting as a condenser, humidifies the air by heating the adsorbent material and evaporating water from it through the regeneration action of the adsorbent material.

[0068] In the embodiment of the present application, the first air duct and the second air duct are symmetrical with respect to the transverse center of the housing 1 , so that the first air duct and the second air duct are completely identical.

[0069] Since the first air duct and the second air duct need to periodically switch between the fresh air duct and the exhaust air duct, if the two are different, it will cause obvious wind pressure inequality between the two, which will bring the risk of cross-wind, thereby reducing the working efficiency of the humidifier and increasing energy consumption.

[0070] A first filter 3 and a second filter 4 are further provided in the humidity control unit, wherein the first filter 3 is located in the first air duct and the second filter 4 is located in the second air duct, for filtering the circulating air.

[0071] The following is an introduction to the fresh air humidity control multi-split system using m=3 as an example:

[0072] Reference Figure 4 and Figure 5 According to an embodiment of the present application, the fresh air humidity control multi-split unit includes a first humidity control unit 101, a second humidity control unit 102 and a third humidity control unit 103.

[0073] The refrigerant circuit of the fresh air humidity control multi-split unit is provided with three four-way valves 8, three electronic expansion valves 9 and a compressor 7.

[0074] The three four-way valves 8 are four-way valve (8-1), four-way valve (8-2), and four-way valve (8-3), which correspond one to one to the three humidity control units.

[0075] The three electronic expansion valves 9 are electronic expansion valve (9-1), electronic expansion valve (9-2), and electronic expansion valve (9-3), which correspond one to one to the three humidity control units.

[0076] In the refrigerant circuit, the output end of the compressor 7 is connected to the D pipes of the four-way valves (8-1), (8-2), and (8-3), and the input end of the compressor 7 is connected to the S pipes of the four-way valves (8-1), (8-2), and (8-3).

[0077] The C tube of the four-way valve (8-1) is connected in series with the first heat exchanger 5 of the first humidity control unit 101, the electronic expansion valve (9-1), the second heat exchanger 6 of the first humidity control unit 101, and the E tube of the four-way valve (8-1);

[0078] The C tube of the four-way valve (8-2) is connected in series with the first heat exchanger 5 of the second humidity control unit 102, the electronic expansion valve (9-2), the second heat exchanger 6 of the second humidity control unit 102, and the E tube of the four-way valve (8-2);

[0079] The C tube of the four-way valve (8-3) is connected in series with the first heat exchanger 5 of the third humidity control unit 103, the electronic expansion valve (9-3), the second heat exchanger 6 of the third humidity control unit 103, and the E tube of the four-way valve (8-3).

[0080] In the present application, multiple four-way valves are provided corresponding to multiple humidity control units, so that the multiple humidity control units can be independent of each other and can select the reversing time according to their own conditions without synchronous reversing, which is more intelligent.

[0081] According to an embodiment of the present application, the compressor 7 and three four-way valves 8 are arranged on the outdoor unit, and the shell 2 part is the indoor unit. In this way, the outdoor unit can be installed in the equipment room, avoiding the switching sound of the four-way valve 8 affecting the user experience.

[0082] In addition, a check valve 10 may be connected in series between the output end of the compressor 7 and the D pipe of the four-way valve.

[0083] <Summer Dehumidification Mode>

[0084] Reference Figure 2 、 Figure 4 , first state: the first heat exchanger 5 is used as a condenser, the second heat exchanger 6 is used as an evaporator; the first fan 21 is reversed and used as an exhaust fan, and the second fan 22 is forward rotated and used as a supply fan.

[0085] Second air duct (fresh air duct): Fresh air enters from the second outdoor air outlet 12. Driven by the second fan 22, it is first purified by the second filter 4 and then passes through the second heat exchanger 6 (evaporator). The fresh air is cooled and dehumidified. The moisture in the fresh air is adsorbed by the adsorption material on the surface of the second heat exchanger 6 (adsorption process). The fresh air then reaches the second indoor air outlet 14 and is sent into the room, completing the fresh air dehumidification process.

[0086] First air duct (exhaust duct): Indoor air enters through the first indoor air outlet 13, first passes through the first heat exchanger 5 (condenser), takes away the heat of the first heat exchanger 5 and the moisture in the adsorption material (regeneration process), then passes through the first filter 3 for purification, and then, driven by the first fan, finally reaches the first outdoor air outlet 11 and is discharged to the outside, completing one exhaust process.

[0087] Refrigerant circuit: The high-temperature and high-pressure refrigerant is delivered from the exhaust port of the compressor 7, first passes through the check valve 10, and then is diverted to the three four-way valves 8 (all in the OFF state at this time, and the states may be inconsistent), and then flows to each humidity control unit (the flow rate of each humidity control unit is determined by 9-1, 9-2, and 9-3). The refrigerant reaches the first heat exchanger 5 of each humidity control unit, transfers the heat to the exhaust air, and the refrigerant becomes a low-temperature and high-pressure two-phase refrigerant, and then flows to the electronic expansion valve 9, is throttled and reduced in pressure to become a low-temperature and low-pressure liquid refrigerant, and then flows to the second heat exchanger 6 of each humidity control unit, absorbs the heat of the air outside the pipe and becomes a low-temperature and low-pressure gaseous refrigerant, and then merges and flows to the E pipe of the four-way valve 8, and then returns to the compressor 7 through the S pipe of the four-way valve 8, thus completing a refrigerant cycle.

[0088] When the reversing conditions are met, refer to Figure 3 and Figure 5 , 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 forward and is used as a blower, and the second fan 22 rotates reverse and is used as an exhaust fan.

[0089] First air duct (fresh air duct): Fresh air enters through the first outdoor air outlet 11. Driven by the first fan 21, it is first purified by the first filter 3 and then passes through the first heat exchanger 5 (evaporator). The fresh air is cooled and dehumidified. The moisture in the fresh air is adsorbed by the adsorption material on the surface of the first heat exchanger 5 (adsorption process). The fresh air then reaches the first indoor air outlet 13 and is sent into the room, completing the fresh air dehumidification process.

[0090] Second air duct (exhaust duct): Indoor air enters through the second indoor air outlet 14, first passes through the second heat exchanger 6 (condenser), takes away the heat of the second heat exchanger 6 and the moisture in the adsorption material (regeneration process), then passes through the second filter 4 for purification, and then, driven by the second fan 22, finally reaches the second outdoor air outlet 12 and is discharged to the outside, completing one exhaust process.

[0091] Refrigerant circuit: The high-temperature and high-pressure refrigerant is delivered from the exhaust port of the compressor 7, first passes through the check valve 10, and then is diverted to the three four-way valves 8 (at this time it is in the ON state, but the states may be inconsistent), and then flows to each humidity control unit (the flow rate of each humidity control unit is determined by 9-1, 9-2, and 9-3). The refrigerant reaches the second heat exchanger 6 of each humidity control unit, transfers the heat to the exhaust air, and the refrigerant becomes a low-temperature and high-pressure two-phase refrigerant, and then flows to the electronic expansion valve 9, is throttled and reduced in pressure to become a low-temperature and low-pressure liquid refrigerant, and then flows to the first heat exchanger 5 of each humidity control unit, absorbs the heat of the air outside the pipe and becomes a low-temperature and low-pressure gaseous refrigerant, and then merges and flows to the C pipe of the four-way valve 8, and then returns to the compressor 7 through the S pipe of the four-way valve 8, thus completing a refrigerant cycle.

[0092] In this way, the dehumidification process continuously cycles between the first state and the second state.

[0093] <Winter Humidification Mode>

[0094] Reference Figure 2 and Figure 4 , first state: the first heat exchanger 5 is used as an evaporator, and the second heat exchanger 6 is used as a condenser;

[0095] The first fan 21 rotates in reverse and serves as an exhaust fan, and the second fan 22 rotates in forward direction and serves as a supply fan.

[0096] Second air duct (fresh air duct): Fresh air enters from the second outdoor air outlet 12. Driven by the second fan 22, it is first purified by the second filter 4 and then passes through the second heat exchanger 6 (condenser). The fresh air is heated and the moisture in the adsorption material on the surface of the second heat exchanger 6 is regenerated and mixed with the fresh air, increasing its humidity. The fresh air then reaches the second indoor air outlet 14 and is sent into the room, completing the fresh air humidification process.

[0097] First air duct (exhaust duct): Indoor return air enters through the first indoor air outlet 13, passes through the first heat exchanger 5 (evaporator), and is cooled. At the same time, the moisture carried by the return air is adsorbed by the adsorption material on the surface of the first heat exchanger 5, thereby cooling and dehumidifying the return air. The return air is then purified by the first filter 3 and then, driven by the first fan 21, reaches the first outdoor air outlet 11 and is discharged outdoors, completing the exhaust process.

[0098] Refrigerant circuit: The high-temperature and high-pressure refrigerant is delivered from the exhaust port of the compressor 7, first passes through the check valve 10, and then is diverted to the three four-way valves 8 (at this time it is in the ON state, the states may also be inconsistent), and then flows to each humidity control unit (the flow rate of each humidity control unit is determined by 9-1, 9-2, and 9-3). The refrigerant reaches the second heat exchanger 6 of each humidity control unit, transfers the heat to the fresh air, and the refrigerant becomes a low-temperature and high-pressure two-phase refrigerant, and then flows to the electronic expansion valve 9, is throttled and reduced in pressure to become a low-temperature and low-pressure liquid refrigerant, and then flows to the first heat exchanger 5 of each humidity control unit, absorbs the heat of the air outside the pipe and becomes a low-temperature and low-pressure gaseous refrigerant, and then merges and flows to the C pipe of the four-way valve 8, and then returns to the compressor 7 through the S pipe of the four-way valve 8, thus completing a refrigerant cycle.

[0099] When the reversing conditions are met, refer to Figure 3 and Figure 5 , 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 forward and is used as a blower; the second fan 22 rotates reverse and is used as an exhaust fan.

[0100] Second state:

[0101] First air duct (fresh air duct): Fresh air enters from the first outdoor air outlet 11. Driven by the first fan 21, it is first purified by the first filter 3 and then passes through the first heat exchanger 5 (condenser). The fresh air is heated and the moisture in the adsorption material on the surface of the first heat exchanger 5 is regenerated and mixed into the fresh air, increasing its humidity. The fresh air then reaches the first indoor air outlet 13 and is sent into the room, completing the fresh air humidification process.

[0102] Second air duct (exhaust duct): Indoor return air enters through the second indoor air outlet 14, first passes through the second heat exchanger 6 (evaporator), where it is cooled. At the same time, the moisture carried by the return air is adsorbed by the adsorption material on the surface of the second heat exchanger 6, thereby cooling and dehumidifying the return air. The return air is then purified by the second filter 4 and then driven by the second fan 22 to reach the second outdoor air outlet 12 and be discharged outdoors, completing one exhaust process.

[0103] Refrigeration system: The high-temperature and high-pressure refrigerant is delivered from the exhaust port of the compressor 7, first passes through the check valve 10, and then is diverted to the three four-way valves 8 (at this time it is in the OFF state, and the states may also be inconsistent), and then flows to each humidity control unit (the flow rate of each humidity control unit is determined by 9-1, 9-2, and 9-3). The refrigerant reaches the first heat exchanger 5 of each humidity control unit, transfers the heat to the fresh air, and the refrigerant becomes a low-temperature and high-pressure two-phase refrigerant, and then flows to the electronic expansion valve 9, is throttled and reduced in pressure to become a low-temperature and low-pressure liquid refrigerant, and then flows to the second heat exchanger 6 of each humidity control unit, absorbs the heat of the air outside the pipe and becomes a low-temperature and low-pressure gaseous refrigerant, and then merges and flows to the E pipe of the four-way valve 8, and then returns to the compressor 7 through the S pipe of the four-way valve 8, thus completing a refrigerant cycle.

[0104] In this way, the humidification process continuously cycles between the first state and the second state.

[0105] <Electronic expansion valve opening>

[0106] In some embodiments of the present application, in the dehumidification mode, the electronic expansion valve is controlled according to the following formula:

[0107]

[0108] Where, i = {1, 2, ..., m}; Tssh i Indicates the superheat of the humidity control unit where the electronic expansion valve is located; AVERAGE indicates the average superheat of all humidity control units; V0 indicates the standard opening of the humidity control unit capacity.

[0109] That is, the opening degree of the electronic expansion valve (9-1) corresponding to the first humidity control unit is:

[0110]

[0111] Tssh1 represents the superheat degree of the first humidity control unit.

[0112] The opening degree of the electronic expansion valve (9-2) corresponding to the second humidity control unit is:

[0113]

[0114] Tssh2 represents the superheat of the second humidity control unit.

[0115] The opening degree of the electronic expansion valve (9-3) corresponding to the third humidity control unit is:

[0116]

[0117] Tssh3 represents the superheat of the third humidity control unit.

[0118] In humidification mode, the electronic expansion valve is controlled according to the following formula:

[0119]

[0120] Wherein, V1 represents the standard opening of the humidity control unit capacity, and D is a constant.

[0121] In the present application, the opening degree of the electronic expansion valve is determined according to the superheat degree of each humidity control unit, so that the multi-connection system can operate reliably and stably.

[0122] <Compressor frequency calculation>

[0123] In some embodiments of the present application, the fresh air humidity control multi-split system further includes: a temperature and humidity sensor for detecting the outdoor fresh air temperature Toa and humidity Hoa.

[0124] The controller calculates the absolute humidity doa of the outdoor fresh air based on Toa and Hoa detected by the temperature and humidity sensor, and controls the frequency Fx1 of the compressor based on doa and the target absolute humidity ds set indoors.

[0125] Specifically, in dehumidification mode, the frequency of the compressor is calculated according to the following formula:

[0126]

[0127] Among them, A, B, C, and n are constants;

[0128] Q represents the set air volume, and M represents the maximum air volume, or Q represents the number of humidity control units that are turned on, and M represents the total number of humidity control units.

[0129] For example, A=10, B=1, n=2, C=10, and Q=M

[0130] When the outdoor dry-bulb and wet-bulb ratio is 35 / 28 (21.1g) and the indoor setting target is 27 / 19 (10.4g), the required frequency is

[0131] Fx1=0.1*(21.1-10.4) 2 +1*(21.1-10.4)+10=32hz

[0132] Experiments have verified that under this working condition, the compressor frequency of 32Hz just meets the dehumidification requirements and can ensure reliable operation.

[0133] In humidification mode, the frequency of the compressor is calculated according to the following formula:

[0134]

[0135] Among them, A1, B1, C1, and n1 are constants;

[0136] Q represents the set air volume, and M represents the maximum air volume, or Q represents the number of humidity control units that are turned on, and M represents the total number of humidity control units.

[0137] The above compressor frequency formula is fitted by the dehumidification capacity under different working conditions, and then revised based on multiple test results, so that the operation of the compressor is more stable and reliable while meeting different dehumidification requirements without causing energy waste.

[0138] By introducing the air volume parameters Q and M into the formula, the compressor can automatically reduce its frequency when the air volume decreases.

[0139] In addition, the fresh air temperature Toa is introduced into the formula in the humidification mode. When Toa≤0℃, the frequency of the compressor can be reduced, thereby preventing the evaporation temperature from being too low and causing frost. If frost forms, it may cause the adsorption material on the surface of the heat exchanger to crack.

[0140] <Switching time>

[0141] In some embodiments of the present application, after the i-th humidity control unit is turned on, the absolute humidity doa of the outdoor fresh air is calculated based on Toa and Hoa, and the difference Δdi between the absolute humidity doa of the fresh air and the set indoor humidity dsi is calculated; and the switching time Ti of the four-way valve of the i-th humidity control unit is obtained according to the following formula:

[0142] Ti = Δdi × (x / y);

[0143] Where x is the standard commutation time and y is a constant.

[0144] In this application, the switching time is calculated based on the indoor and outdoor humidity difference. Compared with the switching time of a fixed period, the switching time of this application is associated with the humidity, which is more reasonable.

[0145] When the i-th humidity control unit is turned on and receives the dehumidification mode instruction, the four-way valve 8-i is controlled to be in the OFF state, the second fan 22 of the i-th humidity control unit rotates forward, and the first fan 21 rotates reversely; when the operating time reaches the reversing time Ti, the four-way valve 8-i is reversed and becomes ON. At the same time, the first fan 21 of the i-th humidity control unit slows down and rotates forward to the target speed for a period of t1, and the second fan 22 slows down and rotates reversely to the target speed for a period of t2 (t1≤t2).

[0146] Similarly, when the i-th humidity conditioning unit is powered on and receives an instruction for the humidifying mode, it controls the four-way valve 8-i to be in the ON state. The second fan 22 of the i-th humidity conditioning unit rotates forward, and the first fan 21 rotates in reverse. When the running time reaches the commutation time Ti, the four-way valve 8-i commutates and is in the OFF state. At the same time, the first fan 21 of the i-th humidity conditioning unit decelerates and rotates forward to the target speed for a duration of t1, and the second fan 22 decelerates and rotates in reverse to the target speed for a duration of t2.

[0147] Referring to Figure 6 and Figure 7 , when changing from the first state to the second state, the four-way valve 8 commutates. At the same time, the first fan 21 and the second fan 22 decelerate. The first fan 21 changes its rotation direction (becomes the supply fan) at t1 time after the four-way valve commutation, and the second fan 22 changes its rotation direction (becomes the exhaust fan) at t2 (t1 ≤ t2) time after the four-way valve 8 commutation.

[0148] When changing from the second state to the first state, the four-way valve 8 commutates. At the same time, the first fan 21 and the second fan 22 decelerate. The first fan 21 changes its rotation direction (becomes the exhaust fan) at t2 time after the four-way valve 8 commutation, and the second fan 22 changes its rotation direction (becomes the supply fan) at t1 time after the four-way valve commutation.

[0149] For the case of t1 < t2, the supply fan starts at t1 time after commutation, and the exhaust fan starts at t2 time after commutation. That is to say, the supply fan starts working earlier than the exhaust fan after commutation. In this way, it can be ensured that the fresh air volume is greater than the exhaust air volume. By controlling the air volume, it can be ensured that the fresh air duct is always in a positive pressure state, and the return air duct is always in a negative pressure state. In this way, it can avoid the exhaust air from leaking into the fresh air, ensuring the purity of the fresh air.

[0150] The first concept of this application realizes the switching between the fresh air duct and the return air duct through the forward and reverse rotation of the fan, without a wind valve switching device, simplifies the product structure, reduces the cost, and also makes the product more compact and saves the occupied space.

[0151] The second concept of this application realizes the switching between the fresh air duct and the return air duct through the forward and reverse rotation of the fan, without a wind valve switching device. The reduction of components results in a small internal resistance of the unit, improves the working efficiency of the unit, and reduces the energy consumption.

[0152] The third concept of this application realizes the switching between the fresh air duct and the return air duct through the forward and reverse rotation of the fan, and realizes humidification or dehumidification by coating an adsorption material on the heat exchanger, making the product structure more compact.

[0153] The fourth concept of this application is that multiple humidity conditioning units form a multi-connected unit, and multiple four-way valves are respectively set corresponding to them, sharing a compressor, realizing independent control of each humidity conditioning unit, making it unnecessary for the humidity conditioning units to be synchronized, and being more flexible and intelligent.

[0154] The fifth concept of the present application is to establish a connection between the frequency of the compressor and the absolute humidity doa of the outdoor fresh air and the absolute humidity ds set as the indoor target, so that the operation of the compressor is more stable and reliable while meeting different dehumidification requirements and will not cause energy waste.

[0155] The sixth concept of the present application is to establish a relationship between the frequency formula of the compressor and the air volume, so that the compressor can automatically reduce the frequency when the air volume decreases.

[0156] The seventh concept of the present application is to introduce the Toa variable into the compressor frequency formula in the humidification mode. When Toa≤0℃, the frequency of the compressor automatically decreases, which can effectively prevent frosting caused by the evaporation temperature being too low, and avoid the risk of frosting causing cracking of the adsorption material on the surface of the heat exchanger.

[0157] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

[0158] For ease of explanation, the above description has been presented in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations are possible. The above embodiments have been selected and described to better explain the principles and practical applications, thereby enabling those skilled in the art to better utilize the embodiments and various different variations of the embodiments suitable for specific use considerations.

Claims

1. A fresh air humidity control multi-split unit, characterized in that: include: m humidity control units, m ≥ 2; The humidity control unit comprises: The first air duct and the second air duct are connected to the indoor and outdoor respectively; a first fan and a second fan, wherein the first fan is disposed in the first air duct, and the second fan is disposed in the second air duct; A first heat exchanger and a second heat exchanger, both of which are coated with adsorption materials, the first heat exchanger is arranged in the first air duct, and the second heat exchanger is arranged in the second air duct; The humidity control unit can realize the conversion between the first state and the second state; In the first state, the first fan is used as an exhaust fan, so that the return air flows to the outside through the first air duct; the second fan is used as a supply fan, so that the fresh air flows to the room through the second air duct; When the first state is changed to the second state, the first fan changes its direction and acts as a supply fan, so that fresh air flows into the room through the first air duct; the second fan changes its direction and acts as an exhaust fan, so that return air flows into the room through the second air duct; The humidity control unit further comprises: a refrigerant circuit comprising a four-way valve, the first heat exchanger, an electronic expansion valve and the second heat exchanger; the refrigerant circuits of the m humidity control units share a compressor; Also includes: Temperature and humidity sensor, used to detect the temperature Toa and humidity Hoa of outdoor fresh air; The controller is used to calculate the absolute humidity doa of the outdoor fresh air based on Toa and Hoa, and control the frequency Fx1 of the compressor based on the difference between doa and the set indoor absolute humidity ds; In dehumidification mode, ； Among them, A, B, C, and n are constants; In humidification mode, ； Where Toa represents the temperature of outdoor fresh air; A1, B1, C1, and n1 are constants; Q is the set air volume, M is the maximum air volume; or, Q is the number of humidity control units turned on, M is the total number of humidity control units.

2. The fresh air humidity control multi-split unit according to claim 1 is characterized in that: It comprises an outdoor unit and an indoor unit, wherein the compressor and m four-way valves are located in the outdoor unit, and the remaining components are located in the indoor unit.

3. The fresh air humidity control multi-split unit according to claim 1 is characterized in that: In dehumidification mode, the opening of the electronic expansion valve is calculated according to the following formula: ； Where i = {1, 2, ..., m}; Tssh i Indicates the superheat of the humidity control unit where the electronic expansion valve is located; AVERAGE represents the average value of superheat of all humidity control units; V0 represents the standard opening of the humidity control unit capacity.

4. The fresh air humidity control multi-split unit according to claim 1, characterized in that: In the humidification mode, the opening of the electronic expansion valve is calculated according to the following formula: ； Where i = {1, 2, ..., m}; Tssh i Indicates the superheat of the humidity control unit where the electronic expansion valve is located; AVERAGE represents the average value of superheat of all humidity control units; V1 represents the standard opening of the humidity control unit capacity; D is a constant.

5. The fresh air humidity control multi-split unit according to claim 1 is characterized in that: Also includes: Temperature and humidity sensor, used to detect the temperature Toa and humidity Hoa of outdoor fresh air; The controller is used to calculate the absolute humidity doa of the outdoor fresh air based on Toa and Hoa after the i-th humidity control unit is turned on, and to calculate the difference between the absolute humidity doa of the fresh air and the indoor set humidity dsi di; and the switching time Ti of the four-way valve of the i-th humidity control unit is obtained according to the following formula: ； Where x is the standard commutation time and y is a constant.

6. The fresh air humidity control multi-split unit according to claim 5, characterized in that: The controller is also used to: After the i-th humidity control unit is turned on, controlling the humidity control unit to operate in a first state; After the humidity control unit has been running for Ti time, the four-way valve is reversed, the first fan and the second fan change directions, and the humidity control unit operates in the second state.

7. The fresh air humidity control multi-split unit according to claim 1, characterized in that: When the first state changes to the second state, the four-way valve is reversed, and the first fan and the second fan are decelerated at the same time. The first fan changes direction after the deceleration lasts for t1 time, and the second fan changes direction after the deceleration lasts for t2 time. When the second state changes to the first state, the four-way valve reverses, and the first fan and the second fan slow down at the same time. The first fan changes direction after the speed reduction lasts for t2 time, and the second fan changes direction after the speed reduction lasts for t1 time; wherein t1≤t2.

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