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. The fresh air humidity control multi-split unit includes: m humidity control units, wherein m≥2; the humidity control unit includes: a first air duct and a second air duct, which are connected to the indoor and outdoor respectively; 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 first fan is used as an exhaust fan, and the return air flows to the outdoor through the first air duct; the second fan is used as a supply fan, and the fresh air flows to the indoor through the second air duct; in the second state, the first fan changes direction and is used as a supply fan, and the fresh air flows to the indoor through the first air duct; the second fan changes direction and is used as an exhaust fan, and the return air flows to the outdoor through the second air duct. This fresh air humidity control multi-split unit achieves continuous dehumidification and humidification by the forward and reverse rotation of the fan, without the need for a wind 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, 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, the second heat exchanger being disposed in the second air duct;

[0006] The humidity control unit can realize the conversion between the first state and the second state;

[0007] In the first state, the first fan is used as an exhaust fan, and the return air flows to the outside through the first air duct; the second fan is used as a supply fan, and the fresh air flows to the room through the second air duct;

[0008] When the first state is changed to the second state, the first fan changes direction and acts as a supply fan, and the fresh air flows into the room through the first air duct; the second fan changes direction and acts as an exhaust fan, and the return air flows into the room through the second air duct;

[0009] The m humidity control units are: a first humidity control unit, a second humidity control unit, ..., an mth humidity control unit;

[0010] The first heat exchanger of the first humidity control unit, the first heat exchanger of the second humidity control unit, ..., and the first heat exchanger of the mth humidity control unit are connected in parallel in the refrigerant circuit;

[0011] The second heat exchanger of the first humidity control unit, the second heat exchanger of the second humidity control unit, ..., the second heat exchanger of the mth humidity control unit are connected in parallel in the refrigerant circuit.

[0012] In some embodiments, the refrigerant circuit has a four-way valve and an electronic expansion valve; the first heat exchanger of the first humidity control unit, the first heat exchanger of the second humidity control unit, ..., the first heat exchanger of the mth humidity control unit are connected in parallel between the C tube of the four-way valve and one end of the electronic expansion valve; the second heat exchanger of the first humidity control unit, the second heat exchanger of the second humidity control unit, ..., the second heat exchanger of the mth humidity control unit are connected in parallel between the E tube of the four-way valve and the other end of the electronic expansion valve.

[0013] In some embodiments, in the refrigerant circuit: the branch where the first heat exchanger of each humidity control unit is located, and the branch where the second heat exchanger of each humidity control unit is located are both connected in series with solenoid valves; when one of the first heat exchanger and the second heat exchanger is used as an evaporator, the other is used as a condenser; the solenoid valve on the branch where the evaporator is located is fully open; the solenoid valve on the branch where the condenser is located is used as a flow regulating valve to adjust the flow of the corresponding branch.

[0014] In some embodiments, in dehumidification mode, the opening of the flow control valve is calculated according to the following formula:

[0015]

[0016] Wherein, i = {1, 2, ..., m};

[0017] Tssh i Indicates the superheat of the humidity control unit where the flow control valve is located;

[0018] AVERAGE represents the average value of superheat of all humidity control units;

[0019] V0 represents the standard opening of the humidity control unit capacity.

[0020] In some embodiments, in the humidification mode, the opening of the flow control valve is calculated according to the following formula:

[0021]

[0022] Wherein, i = {1, 2, ..., m};

[0023] Tssh i Indicates the superheat of the humidity control unit where the flow control valve is located;

[0024] AVERAGE represents the average value of superheat of all humidity control units;

[0025] V1 represents the standard opening of the humidity control unit capacity;

[0026] D is a constant.

[0027] In some embodiments, the refrigerant circuit also has a compressor; 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 doa and the absolute humidity ds set as the indoor target.

[0028] In some embodiments, in dehumidification mode,

[0029]

[0030] Among them, A, B, C, and n are constants.

[0031] In some embodiments, in humidification mode,

[0032]

[0033] Among them, A, B, C, and n are constants.

[0034] In some embodiments, when -1°C≤Toa≤1°C, B=1; otherwise,

[0035] In some embodiments, a four-way valve is also included; 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 t1 time after the four-way valve is reversed, and the second fan changes direction t2 time after the four-way valve is reversed; when the second state changes to the first 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 t2 time after the four-way valve is reversed, and the second fan changes direction t1 time after the four-way valve is reversed; wherein, t1<t2. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] 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;

[0037] 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;

[0038] 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;

[0039] Figure 4 A schematic diagram of a fresh air humidity control multi-split system in a first state according to some embodiments is shown;

[0040] Figure 5 A schematic diagram of a fresh air humidity control multi-split system in a second state according to some embodiments is shown;

[0041] Figure 6 A timing diagram of a fresh air humidity control multi-split system in a dehumidification mode according to some embodiments is shown;

[0042] Figure 7 A timing diagram of a fresh air humidity control multi-split system in a humidification mode according to some embodiments is shown;

[0043] In the above figures: 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. DETAILED DESCRIPTION

[0044] 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.

[0045] 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.

[0046] 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" and "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.

[0047] 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.

[0048] The following describes the embodiments of the present application in detail with reference to the accompanying drawings.

[0049] Reference Figures 1 to 5 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.

[0050] The following is an introduction to the humidity control unit:

[0051] Specific reference Figures 1 to 3 The humidity control unit includes a housing 1, which generally forms the exterior of the humidity control unit and is generally rectangular in shape. The sidewalls of the housing 1 are provided with four air vents, 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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;

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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 and purifying the circulating air.

[0068] The following is an introduction to the fresh air humidity control multi-split system using m=3 as an example:

[0069] 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.

[0070] The fresh air humidity control multi-split unit also includes a refrigerant circuit; the first heat exchanger 5 of the first humidity control unit 101, the first heat exchanger 5 of the second humidity control unit 102, and the first heat exchanger 5 of the third humidity control unit 103 are connected in parallel in the refrigerant circuit; the second heat exchanger 6 of the first humidity control unit 101, the second heat exchanger 6 of the second humidity control unit 102, and the second heat exchanger 6 of the third humidity control unit 103 are connected in parallel in the refrigerant circuit.

[0071] According to an embodiment of the present application, the refrigerant circuit includes a compressor 7, a four-way valve 8, and an electronic expansion valve 9. The output end of the compressor 7 is connected to the D tube of the four-way valve 8, and the input end of the compressor 7 is connected to the S tube of the four-way valve 8. The first heat exchanger 5 of the first humidity control unit 101, the first heat exchanger 5 of the second humidity control unit 102, and the first heat exchanger 5 of the third humidity control unit 103 are connected in parallel between the C tube of the four-way valve 8 and one end of the electronic expansion valve 9. The second heat exchanger 6 of the first humidity control unit 101, the second heat exchanger 6 of the second humidity control unit 102, and the second heat exchanger 6 of the third humidity control unit 103 are connected in parallel between the E tube of the four-way valve 8 and the other end of the electronic expansion valve 9.

[0072] The four-way valve 8 can change the purpose of the heat exchanger by switching between two states. In one state, the first heat exchanger 5 functions as an evaporator and the second heat exchanger 6 functions as a condenser; in the other state, the first heat exchanger 5 functions as a condenser and the second heat exchanger 6 functions as an evaporator.

[0073] In the present application, continuous humidification or dehumidification of the unit is achieved by reversing the four-way valve 8 and rotating the fan forward and reverse.

[0074] In some embodiments of the present application, a solenoid valve is connected in series on each branch of the first heat exchanger 5 and each branch of the second heat exchanger 6 .

[0075] Specifically, a solenoid valve E-1 is connected in series to the branch where the first heat exchanger 5 of the first humidity control unit 101 is located, and a solenoid valve L-1 is connected in series to the branch where the second heat exchanger 6 of the first humidity control unit 101 is located;

[0076] A solenoid valve E-2 is connected in series to the branch where the first heat exchanger 5 of the second humidity control unit 102 is located, and a solenoid valve L-2 is connected in series to the branch where the second heat exchanger 6 of the second humidity control unit 102 is located;

[0077] A solenoid valve E- 3 is connected in series to the branch where the first heat exchanger 5 of the third humidity control unit 103 is located, and a solenoid valve L- 3 is connected in series to the branch where the second heat exchanger 6 of the third humidity control unit 103 is located.

[0078] It should be noted that the solenoid valve may also be an electronic expansion valve.

[0079] When the first heat exchanger 5 is used as an evaporator and the second heat exchanger 6 is used as a condenser, the solenoid valves E-1, E-2, and E-3 of the branch where the evaporator is located are fully open; the solenoid valves L-1, L-2, and L-3 of the branch where the condenser is located are used as flow regulating valves, and their opening degrees can be controlled according to the superheat of the corresponding humidity control unit, thereby adjusting the refrigerant flow in each humidity control unit.

[0080] When the first heat exchanger 5 is used as a condenser and the second heat exchanger 6 is used as an evaporator, the solenoid valves E-1, E-2, and E-3 in the branch where the condenser is located are used as flow regulating valves, and their openings can be controlled according to the superheat, thereby adjusting the refrigerant flow in each humidity control unit; the solenoid valves L-1, L-2, and L-3 in the branch where the evaporator is located are fully open.

[0081] <Summer Dehumidification Mode>

[0082] Reference Figure 2 and 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.

[0083] 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.

[0084] 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.

[0085] Refrigerant circuit: The exhaust port of the compressor 7 delivers the high-temperature and high-pressure refrigerant, which first passes through the four-way valve 8 (in the OFF state at this time), and then flows to the gas pipe of each humidity control unit. The flow rate of each humidity control unit is determined by E-1, E-2, and E-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. It 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 liquid pipe of each humidity control unit. At this time, L-1, L-2, and L-3 are fully open. The refrigerant reaches 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. Then, they merge together and flow to the E pipe of the four-way valve 8, and then return to the compressor 7 through the S pipe of the four-way valve 8, thus completing a refrigerant cycle.

[0086] When the state transition 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.

[0087] 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.

[0088] 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.

[0089] Refrigerant circuit: The exhaust port of the compressor 7 delivers the high-temperature and high-pressure refrigerant, which first passes through the four-way valve 8 (in the ON state at this time), and then flows to each humidity control unit. The flow rate of each humidity control unit is determined by L-1, L-2, and L-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. It 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 gas pipe of each humidity control unit. At this time, E-1, E-2, and E-3 are fully open. The refrigerant reaches 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. Then they merge together and flow to the C pipe of the four-way valve 8, and then return to the compressor 7 through the S pipe of the four-way valve 8, thus completing a refrigerant cycle.

[0090] In this way, the dehumidification process continuously cycles between the first state and the second state.

[0091] <Winter Humidification Mode>

[0092] 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;

[0093] 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.

[0094] 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.

[0095] 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.

[0096] Refrigerant circuit: The exhaust port of the compressor 7 delivers the high-temperature and high-pressure refrigerant, which first passes through the four-way valve 8 (in the ON state at this time), and then flows to each humidity control unit. The flow rate of each humidity control unit is determined by L-1, L-2, and L-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. It 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 gas pipe of each humidity control unit. At this time, E-1, E-2, and E-3 are fully open. The refrigerant reaches 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. Then they merge and flow to the C pipe of the four-way valve 8, and then return to the compressor 7 through the S pipe of the four-way valve 8, thus completing a refrigerant cycle.

[0097] When the state transition 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.

[0098] Second state:

[0099] 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.

[0100] 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.

[0101] Refrigerant circuit: The exhaust port of the compressor 7 delivers the high-temperature and high-pressure refrigerant, which first passes through the four-way valve 8 (in the OFF state at this time), and then flows to each humidity control unit. The flow rate of each humidity control unit is determined by E-1, E-2, and E-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. It 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 liquid pipe of each humidity control unit. At this time, L-1, L-2, and L-3 are fully open. The refrigerant reaches 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. Then they merge and flow to the E pipe of the four-way valve 8, and then return to the compressor 7 through the S pipe of the four-way valve 8, thus completing a refrigerant cycle.

[0102] In this way, the humidification process continuously cycles between the first state and the second state.

[0103] In some embodiments of the present application, reference is made to Figure 6 and Figure 7 When the first state changes to the second state, the four-way valve 8 is reversed, and the first fan 21 and the second fan 22 are decelerated. The first fan 21 changes direction (becomes a supply fan) at time t1 after the four-way valve is reversed, and the second fan 22 changes direction (becomes an exhaust fan) at time t2 (t1≤t2) after the four-way valve is reversed.

[0104] When the second state changes to the first state, the four-way valve 8 is reversed, and the first fan 21 and the second fan 22 are decelerated. The first fan 21 changes direction (becomes an exhaust fan) at t2 time after the four-way valve 8 is reversed, and the second fan 22 changes direction (becomes a supply fan) at t1 time after the four-way valve is reversed.

[0105] For the case of t1<t2, the supply fan starts at t1 time after the reversal, and the exhaust fan starts at t2 time after the reversal. That is to say, the supply fan starts before the exhaust fan after the reversal. This ensures that the fresh air volume is greater than the exhaust air volume. By controlling the air volume, the fresh air duct is always in a positive pressure state and the return air duct is always in a negative pressure state. This avoids the exhaust air from mixing with the fresh air, ensuring the purity of the fresh air.

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

[0107]

[0108] Where, i = {1, 2, ..., m}; Tssh iIndicates the superheat of the humidity control unit where the flow control 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 degrees of the flow control valve (E-1) of the first humidity control unit in the first state and the flow control valve (L-1) of the first humidity control unit in the second state are:

[0110]

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

[0112] The opening degrees of the flow regulating valve (E-2) of the second humidity control unit in the first state and the flow regulating valve (L-2) of the second humidity control unit in the second state are:

[0113]

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

[0115] The opening degrees of the flow regulating valve (E-3) of the third humidity control unit in the first state and the flow regulating valve (L-3) of the third humidity control unit in the second state are:

[0116]

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

[0118] In humidification mode, the flow control 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, by providing a flow control valve and determining the opening of the flow control valve according to the superheat of each humidity control unit, the multi-connected system can be operated reliably and stably.

[0122] 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.

[0123] 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.

[0124] Specifically, in dehumidification mode, the frequency of the compressor is calculated according to the following formula:

[0125]

[0126] Among them, A, B, C, and n are constants.

[0127] Exemplarily, the C value is a correction coefficient, A=10, B=60, and n=2.

[0128]

[0129] [1] When the outdoor dry-bulb and wet-bulb ratio is 35 / 28 (21.1g) and the indoor target is 27 / 19 (10.4g), the required frequency is

[0130] Fx1=0.1*(21.1-10.4) 2 +60 / 35*(21.1-10.4)+100 / (21.1-10.4)=39.1hz

[0131] Experiments have verified that under this working condition, the compressor frequency of 39Hz just meets the dehumidification requirements and can ensure reliable operation.

[0132] [2] When the outdoor dry-bulb and wet-bulb ratio is 43 / 37 (38.4g) and the indoor target is 27 / 19 (10.4g), the required frequency is

[0133] Fx1=0.1*(38.4-10.4) 2 +60 / 43*(38.4-10.4)-(38.4-10.4)=89.4hz

[0134] In this experimental condition, the calculated frequency of the compressor exceeded the upper limit of 60Hz, so the compressor operated according to the upper limit at this time.

[0135] [3] When the outdoor dry-bulb and wet-bulb values ​​are 25 / 22 (15.4g) and the indoor target value is 27 / 19 (10.4g), the required frequency is

[0136] Fx1=0.1*(15.4-10.4) 2 +60 / 25*(15.4-10.4)+50 / (15.4-10.4)=24.5hz

[0137] Experiments have verified that under this working condition, the compressor frequency of 25Hz just meets the dehumidification requirements and can ensure reliable operation.

[0138] In humidification mode, the frequency of the compressor is calculated according to the following formula:

[0139]

[0140] Among them, A, B, C, and n are constants.

[0141] For example, the B value is the correction parameter

[0142]

[0143] C value is the correction parameter

[0144] Δd=(ds-doa) Toa C value ≥8g ≤0℃ Δd 4≤Δd<8g ＞0℃ 0 Δd<4g Unrestricted -Δd

[0145] The above compressor frequency formula is fitted by the dehumidification capacity and outdoor temperature 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 and will not cause energy waste.

[0146] 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.

[0147] In some embodiments of the present application, components such as the compressor 7 and the four-way valve 8 are externally located outside the housing 1, so that the number of components inside the housing can be reduced, thereby optimizing the air supply system.

[0148] The first concept of the present application is to switch the fresh air duct and the return air duct by the forward and reverse rotation of the fan, without the need for an air valve switching device, which simplifies the product structure, reduces costs, and makes the product smaller, saving space.

[0149] The second concept of the present application is to switch the fresh air duct and the return air duct by the forward and reverse rotation of the fan, without the need for a damper switching device. The reduction in components reduces the internal resistance of the unit, improves the working efficiency of the unit, and reduces energy consumption.

[0150] The third concept of the present application is to switch the fresh air duct and the return air duct by the forward and reverse rotation of the fan, and to achieve humidification or dehumidification by coating adsorption material on the heat exchanger, making the product structure more compact.

[0151] The fourth concept of the present application is that multiple humidity control units form a multi-connected system, share a set of compressors and four-way valves, and the flow entering each humidity control unit can be adjusted by setting a flow regulating valve; and the opening of the flow regulating valve is determined according to the superheat of the unit, so that each humidity control unit can operate reliably.

[0152] The fifth concept of this application is to establish a connection between the frequency of the compressor and the absolute humidity doa of the outdoor fresh air, the absolute humidity ds set as the indoor target, and the temperature Toa of the outdoor fresh air, so that the operation of the compressor is more stable and reliable while meeting different dehumidification requirements and will not cause energy waste.

[0153] 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.

[0154] 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, where 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 m humidity control units are: a first humidity control unit, a second humidity control unit, ..., an mth humidity control unit; The refrigerant circuit of the fresh air humidity control multi-split unit is provided with a compressor, a four-way valve and an electronic expansion valve; The first heat exchanger of the first humidity control unit, the first heat exchanger of the second humidity control unit, ..., and the first heat exchanger of the mth humidity control unit are connected in parallel between the C tube of the four-way valve and one end of the electronic expansion valve; The second heat exchanger of the first humidity control unit, the second heat exchanger of the second humidity control unit, ..., and the second heat exchanger of the mth humidity control unit are connected in parallel between the E tube of the four-way valve and the other end of the electronic expansion valve; The branch where the first heat exchanger of each humidity control unit is located, and the branch where the second heat exchanger of each humidity control unit is located are both connected in series with a solenoid valve; When one of the first heat exchanger and the second heat exchanger is used as an evaporator, the other is used as a condenser; The solenoid valve on the branch where the evaporator is located is fully open; The solenoid valve on the branch where the condenser is located is used as a flow regulating valve to adjust the flow of the corresponding branch; In dehumidification mode, the opening of the flow control 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 flow control 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; The fresh air humidity control multi-split system 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 doa and the set target absolute humidity ds indoors; In dehumidification mode, ; Where A, B, n are constants, C is the correction parameter; Where ⊿d= , when ⊿d≥20g, C=-⊿d; when 8g≤⊿d<20g, ; When ⊿d<8g, ; In humidification mode, ; Where A and n are constants, B and C are correction parameters; when -1℃≤Toa≤1℃, B=1; otherwise, ;⊿d= When ⊿d≥8g and Toa≤0℃, C=⊿d; when 4g≤⊿d<8g and Toa>0℃, C=0; when ⊿d<4g, C=-⊿d.

2. The fresh air humidity control multi-split unit according to claim 1 is characterized in that: In the humidification mode, the opening of the flow control valve is calculated according to the following formula: ； Wherein, V1 represents the standard opening of the humidity control unit capacity; D is a constant.

3. The fresh air humidity control multi-split unit according to claim 1 is 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 t1 after the four-way valve is reversed, and the second fan changes direction t2 after the four-way valve is reversed. 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 t2 time after the four-way valve reverses, and the second fan changes direction t1 time after the four-way valve reverses; wherein t1≤t2.

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