Air dehumidification device

Abstract

The present invention discloses an air dehumidification device, including an outer shell, a heat exchanger, including a first heat exchanger and a second heat exchanger; a compressor; a reversing device, including a first reversing device and a second reversing device; an outdoor temperature detection module, used to detect the outdoor temperature; an outdoor humidity detection module, used to detect the outdoor relative humidity; an air quality detection module, used to detect the outdoor air quality; and a control module, which is configured to: when the outdoor temperature and the outdoor relative humidity meet the dehumidification conditions, control the dehumidification to start, and determine the dehumidification mode according to the outdoor air quality. The air dehumidification device of the present invention, by setting two reversing devices, can control the connection state between the four connection ports of each reversing device, and at the same time realize the dehumidification and heating functions for the air sent into the room, reduce the feeling of cold wind, and improve the user experience. This solution can also realize different dehumidification modes according to the outdoor air quality conditions, while dehumidifying and meeting the health needs of users.

Description

Technical Field

[0001] The invention relates to the technical field of household appliances, and in particular to an air dehumidification device. Background Art

[0002] As people's living standards improve, they pay more and more attention to the quality of indoor environment and need to regulate the air. Air conditioning includes temperature regulation and humidity regulation. Air quality and comfort are increasingly valued by every family and various commercial and office places.

[0003] In some areas, the phenomenon of returning south winds will occur during the transition period between winter and spring. The outdoor temperature will be between 0 and 15 degrees Celsius and the relative humidity will be above 80%. Many users install fresh air dehumidifiers to dehumidify.

[0004] At present, fresh air dehumidifiers are basically one-way flow. The fresh air first passes through the evaporator for cooling and dehumidification, and then passes through the condenser to increase the temperature. In this process, the moisture content of the air decreases and the temperature rises slightly. However, when the outdoor temperature is low, the fresh air temperature of this device will still be relatively low. If the air conditioner indoor unit is used for dehumidification, the temperature of the treated fresh air will be lower, even lower than 10°C, and there will be a strong sense of cold wind. In order to solve the above problems, some existing solutions usually use reheating methods, such as electric heating, heating coils, etc., which will cause energy waste due to the offset of cold and heat. Summary of the invention

[0005] In order to solve the technical problems in the prior art that the air dehumidification device will cause the indoor air supply temperature to be low and have a cold wind feeling, and the problem of using electric heating for reheating, resulting in energy waste, an air dehumidification device is proposed to solve the above problems.

[0006] In order to achieve the above object, the dehumidification device of the present invention adopts the following technical solution:

[0007] The present invention provides an air dehumidification device, comprising:

[0008] An outer shell is formed with an outdoor air inlet, an outdoor air outlet, an indoor air supply outlet and an indoor air return outlet, and the outer shell has a first heat exchange cavity and a second heat exchange cavity;

[0009] The heat exchanger comprises a first heat exchanger disposed in the first heat exchange cavity and a second heat exchanger disposed in the second heat exchange cavity;

[0010] A compressor, which is connected to two heat exchangers respectively through a four-way valve to form a refrigerant circulation flow path;

[0011] The reversing device comprises a first reversing device and a second reversing device, wherein the first reversing device has four connecting ports, which are respectively connected to an outdoor air outlet, an indoor air supply port, a first heat exchange cavity and a second heat exchange cavity, and the second reversing device has four connecting ports, which are respectively connected to an outdoor air inlet, an indoor air return port, a first heat exchange cavity and a second heat exchange cavity;

[0012] Outdoor temperature detection module, used to detect outdoor temperature;

[0013] Outdoor humidity detection module, used to detect outdoor relative humidity;

[0014] Air quality detection module, used to detect outdoor air quality;

[0015] The control module is configured to: when the outdoor temperature and outdoor relative humidity meet the dehumidification conditions, control the dehumidification to start, and determine the dehumidification mode according to the outdoor air quality.

[0016] In some embodiments of the present invention, the dehumidification device further comprises:

[0017] An exhaust fan, which is arranged at the outdoor exhaust port;

[0018] A blower fan, which is arranged at the indoor air outlet;

[0019] An outdoor exhaust air valve, which is arranged in the outdoor exhaust port;

[0020] An outdoor air inlet valve, which is arranged in the outdoor air inlet;

[0021] When the control module controls dehumidification, the four connection ports of the first reversing device are controlled to be connected to each other, and the operation of the refrigerant circulation system is controlled. One heat exchanger is used as an evaporator, and the other heat exchanger is used as a condenser. The air passing through the evaporator is dehumidified, and the air passing through the condenser is heated. All or part of the air from the two routes is mixed in the first reversing device and discharged into the room through the indoor air supply port.

[0022] In some embodiments of the present invention, the dehumidification mode includes an internal circulation reheat dehumidification mode. When the outdoor air quality is lower than a set value, the internal circulation reheat dehumidification mode is controlled to be executed, including:

[0023] Close the outdoor exhaust air valve and the outdoor air inlet air valve;

[0024] The four connection ports of the second reversing device are controlled to be interconnected. The indoor return air entering the second reversing device from the indoor return air port enters the first heat exchange chamber in one way and the second heat exchange chamber in another way. The indoor return air that has exchanged heat in the first heat exchange chamber and the second heat exchange chamber respectively enters the first reversing device for mixed air and is then discharged from the indoor supply air port.

[0025] In some embodiments of the present invention, the air dehumidification device further comprises:

[0026] Obtain return air humidity content, supply air humidity content and target humidity content respectively;

[0027] The supply air humidity content is compared with the target humidity content, and the air flow rates of the second reversing device to the first heat exchange chamber and the second heat exchange chamber are adjusted according to the comparison result. When the difference between the supply air humidity content and the target humidity content is greater than the upper limit of the humidity content, the air flow rate of the second reversing device to the heat exchange chamber where the evaporator is located is increased. When the difference between the supply air humidity content and the target humidity content is less than the lower limit of the humidity content, the air flow rate of the second reversing device to the heat exchange chamber where the evaporator is located is reduced.

[0028] In some embodiments of the present invention, the air dehumidification device further comprises:

[0029] The air dehumidification device also includes:

[0030] A return air temperature detection module, which is used to detect the return air temperature;

[0031] Return air humidity detection module, which is used to detect the return air relative humidity;

[0032] Determining the return air moisture content according to the return air temperature and the return air relative humidity;

[0033] A supply air temperature detection module, which is used to detect the supply air temperature;

[0034] A supply air humidity detection module, which is used to detect the supply air relative humidity;

[0035] The moisture content of the supply air is determined according to the supply air temperature and the supply air relative humidity.

[0036] In some embodiments of the present invention, the dehumidification mode further includes a partial fresh air reheat dehumidification mode and a full fresh air reheat dehumidification mode. When the outdoor air quality is not lower than a set value, the partial fresh air reheat dehumidification mode or the full fresh air reheat dehumidification mode is controlled to be executed, including:

[0037] Open the outdoor air inlet valve;

[0038] The four connection ports of the first reversing device are controlled to be connected to each other, and the four connection ports of the second reversing device are controlled to be connected in pairs, so that the indoor return air port is connected to one of the heat exchange chambers, and the outdoor air inlet is connected to the other heat exchange chamber.

[0039] Controlling the operation of the refrigerant circulation system to ensure that the evaporator is located in a heat exchange chamber connected to the outdoor air inlet;

[0040] The fresh air reheat dehumidification mode also includes:

[0041] Open the outdoor exhaust damper and start the exhaust fan.

[0042] In some embodiments of the present invention, the execution of the partial fresh air reheat dehumidification mode or the full fresh air reheat dehumidification mode is determined based on the outdoor temperature. When the outdoor temperature is greater than the temperature limit, the execution of the full fresh air reheat dehumidification mode is determined; otherwise, the execution of the partial fresh air reheat dehumidification mode is determined.

[0043] In some embodiments of the present invention, the air dehumidification device further comprises:

[0044] Obtain the humidity content of supply air and return air respectively;

[0045] The partial fresh air reheat dehumidification mode also includes:

[0046] The blower operates according to the set air volume, and controls the first reversing device or the second reversing device to meet the ratio of the fresh air volume entering from the outdoor air inlet to the return air volume entering from the indoor return air inlet to a preset value;

[0047] The supply air humidity content is compared with the return air humidity content, and the supply air temperature is compared with the return air temperature. When the difference between the supply air humidity content and the return air humidity content is greater than the set threshold and the supply air temperature is greater than the return air temperature, the ratio of the fresh air volume to the return air volume is adjusted.

[0048] In some embodiments of the present invention, the fresh air reheat dehumidification mode further includes:

[0049] The supply fan and exhaust fan operate according to their respective set air volumes;

[0050] The supply air humidity content is compared with the return air humidity content, and the supply air temperature is compared with the return air temperature. When the difference between the supply air humidity content and the return air humidity content is greater than the set threshold and the supply air temperature is greater than the return air temperature are not simultaneously satisfied, the opening of the connecting port between the first reversing device and the first heat exchange chamber and the second heat exchange chamber is adjusted.

[0051] In some embodiments of the present invention, the partial fresh air reheat dehumidification mode also includes determining whether the ratio of the actual detected fresh air volume to the actual detected return air volume meets the adjusted ratio. If it does not meet the ratio, the opening of the connecting port of the first reversing device with the first heat exchange chamber and the second heat exchange chamber is adjusted respectively.

[0052] The technical solution of the present invention has the following technical effects compared with the prior art:

[0053] The air dehumidification device of the present invention, by providing two reversing devices, can control the connectivity between the four connection ports of each reversing device, and simultaneously realize the dehumidification and heating functions for the air delivered into the room, thereby reducing the feeling of cold wind and improving the user experience.

[0054] This solution can also determine different dehumidification modes according to the outdoor air quality conditions, dehumidifying while meeting the health needs of users.

[0055] This solution utilizes the condenser of the refrigerant circulation system to heat the air, eliminating the need for an additional electric heating module and thus saving energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0057] Figure 1 It is a structural schematic diagram of an embodiment of the air dehumidification device proposed by the present invention;

[0058] Figure 2 It is a schematic diagram of the piping connection of the refrigerant circulation system in one embodiment of the air dehumidification device proposed by the present invention;

[0059] Figure 3 2 is a schematic structural diagram of a second reversing device in an embodiment of the air dehumidification device proposed by the present invention;

[0060] Figure 4 yes Figure 3 Schematic diagram of the back structure;

[0061] Figure 5 is another structural schematic diagram of the second reversing device of the air dehumidification device proposed by the present invention;

[0062] Figure 6 yes Figure 5 Schematic diagram of the internal structure in two states;

[0063] Figure 7 yes Figure 5 A schematic diagram of the internal structure of in another state;

[0064] Figure 8 It is a control logic diagram of state 1 of the internal circulation reheat dehumidification mode of the air dehumidification device proposed by the present invention;

[0065] Fig. 9It is a schematic diagram of valve plate adjustment of the second reversing device in the internal circulation reheating dehumidification mode of the air dehumidification device proposed by the present invention;

[0066] Fig.10 It is an air path diagram of state 1 of the internal cycle reheat dehumidification mode of the air dehumidification device proposed by the present invention;

[0067] Fig.11 It is a control logic diagram of state 2 of the internal circulation reheat dehumidification mode of the air dehumidification device proposed by the present invention;

[0068] Fig.12 is an air path diagram of state 2 of the internal cycle reheat dehumidification mode of the air dehumidification device proposed by the present invention;

[0069] Fig.13 It is a control logic diagram of the air dehumidification device proposed by the present invention in a partial fresh air reheat dehumidification mode;

[0070] Fig.14 It is an air path diagram of state 1 in the partial fresh air reheat dehumidification mode of the air dehumidification device proposed by the present invention;

[0071] Fig.15 This is a control logic diagram of the fresh air reheat dehumidification mode of the air dehumidification device proposed by the present invention;

[0072] Fig.16 It is an air path diagram of state 1 of the air dehumidification device proposed by the present invention in the fresh air reheat dehumidification mode. DETAILED DESCRIPTION

[0073] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0074] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0075] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0076] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0077] Embodiment 1

[0078] This embodiment proposes an air dehumidification device, such as Figure 1 As shown, it includes an outer shell 10 on which an outdoor air inlet OA, an outdoor air outlet EA, an indoor air supply outlet SA and an indoor air return outlet RA are formed, and a first heat exchange cavity 11 and a second heat exchange cavity 12 are formed in the outer shell 10.

[0079] The air dehumidification device further includes at least two heat exchangers, namely a first heat exchanger 13 disposed in the first heat exchange chamber 11 and a second heat exchanger 14 disposed in the second heat exchange chamber 12 .

[0080] like Figure 2 As shown, the heat exchanger is connected in sequence through the refrigerant pipe compressor 40, the four-way valve 50 and the electronic expansion valve 60 to form a closed refrigerant circulation flow path to realize the transportation of the refrigerant.

[0081] The air dehumidification device of this embodiment also has two reversing devices, namely, a first reversing device 20 and a second reversing device 30. The first reversing device 20 has four connecting ports, which are respectively connected to the outdoor air outlet EA, the indoor air supply port SA, the first heat exchange chamber 11 and the second heat exchange chamber 12. The connection state between the four connecting ports of the first reversing device 20 can be controlled and adjusted according to needs.

[0082] The second reversing device 30 also has four connection ports, which are respectively connected to the outdoor air inlet OA, the indoor air return port RA, the first heat exchange chamber 11 and the second heat exchange chamber 12. The connection state between the four connection ports of the second reversing device 30 can be controlled and adjusted according to demand.

[0083] The dehumidification device also includes an outdoor temperature detection module, an outdoor humidity detection module and an air quality detection module (not shown in the figure). The outdoor temperature detection module is used to detect the outdoor temperature and send it to the control module. The outdoor humidity detection module is used to detect the outdoor relative humidity, and the air quality detection module is used to detect the outdoor air quality, such as PM2.5.

[0084] The control module of the air dehumidification device is configured to: when the outdoor temperature and outdoor relative humidity meet the dehumidification conditions, control the dehumidification to start, and determine the dehumidification mode according to the outdoor air quality.

[0085] In some embodiments of the present invention, the conditions for determining whether to enter dehumidification are met are:

[0086] ①Outdoor temperature ≤ T1. When the temperature is not greater than T1, the higher the relative humidity, the lower the perceived temperature. The value range of T1 is 10℃-18℃.

[0087] ②Outdoor relative humidity ≥M1, and the value range of M1 is 50%-80%.

[0088] If the above two conditions are met at the same time, the dehumidification function will be turned on.

[0089] The dehumidification device of this embodiment is provided with two reversing devices. By controlling the connectivity between the four connecting ports of each reversing device, the dehumidification and heating functions can be simultaneously realized for the air delivered into the room, thereby reducing the feeling of cold air and improving the user experience.

[0090] An exhaust fan 70 is provided at the outdoor air outlet EA, which is used to draw the airflow outside the indoor return air outlet RA into the heat exchange cavity connected thereto.

[0091] The indoor air supply outlet SA is provided with an air blower 80 for driving the air flow in the air flow channel connected with the indoor air supply outlet SA to be discharged from the indoor air supply outlet SA.

[0092] In some embodiments of the present invention, the indoor air supply outlet SA and the indoor air return outlet RA are respectively connected to the indoor room, and the outdoor air inlet OA and the outdoor air exhaust outlet EA are respectively connected to the outdoor room.

[0093] The refrigerant circulation system can achieve the interchange of the cooling and heating functions of the two heat exchange chambers by changing the flow direction of the refrigerant, and at the same time cooperate with the first reversing device 20 and the second reversing device 30 to control the connectivity between their respective connection ports, so as to ensure that the wind delivered into the room through the indoor air supply port SA meets the dehumidification requirements.

[0094] The control module can control the switching of the four-way valve so that the first heat exchanger 13 serves as an evaporator and the second heat exchanger 14 serves as a condenser, or the first heat exchanger 13 serves as a condenser and the second heat exchanger 14 serves as an evaporator.

[0095] The control module can also switch between different airflow channels by controlling the connection states of the four connection ports of the first reversing device 20 and the second reversing device 30 .

[0096] The air dehumidification device of this embodiment, by providing two reversing devices, can control the connectivity between the four connection ports of each reversing device, and simultaneously realize the dehumidification and heating functions for the air delivered into the room, thereby reducing the feeling of cold air and improving the user experience.

[0097] In some embodiments of the present invention, the air dehumidification device further includes an outdoor exhaust air valve 101, which is disposed in the outdoor exhaust port EA.

[0098] In some embodiments of the present invention, the air dehumidification device further includes an outdoor air inlet valve 102, which is disposed in the outdoor air inlet.

[0099] When the control module controls dehumidification, the four connection ports of the first reversing device are connected to each other, and the refrigerant circulation system is controlled to operate. One heat exchanger is used as an evaporator, and the other heat exchanger is used as a condenser to dehumidify the air passing through the evaporator and heat the air passing through the condenser. All or part of the air from the two paths is mixed in the first reversing device and discharged through the indoor air outlet. The mixed air can be dehumidified and heated at the same time, providing comfortable air supply for users.

[0100] In some embodiments of the present invention, the dehumidification mode includes an internal circulation reheat dehumidification mode. When the outdoor air quality is lower than a set value, the internal circulation reheat dehumidification mode is controlled to be executed, including:

[0101] Close the outdoor exhaust air valve 101 and the outdoor air inlet air valve 102.

[0102] The four connection ports for controlling the second reversing device 30 are interconnected. The indoor return air entering the second reversing device 30 from the indoor return air port RA enters the first heat exchange chamber 11 in one way and the second heat exchange chamber 12 in another way. The indoor return air that has exchanged heat in the first heat exchange chamber 11 and the second heat exchange chamber 12 respectively enters the first reversing device 20 for mixed air and is then discharged from the indoor air supply port.

[0103] The dehumidification principle of the internal circulation reheat dehumidification mode is: the air in the indoor return air passing through the evaporator absorbs heat from the refrigerant in the evaporator, and the moisture condenses into water, thereby achieving the purpose of removing moisture from the fresh air.

[0104] At this time, the indoor return air enters the heat exchange chamber where the condenser is located through another route. When passing through the condenser, the return air is heated by the condenser and its temperature rises. Then the two routes of indoor return air enter the first reversing device 20 and mix to obtain dry and high-temperature supply air.

[0105] This solution is applicable to situations where outdoor air is polluted. By closing the outdoor exhaust air valve 101 and the outdoor air inlet air valve 102, outdoor polluted air is prevented from entering the room through the air vents connected to the outdoors, thereby ensuring the user's respiratory health.

[0106] In some embodiments of the present invention, the air dehumidification device further includes two water receiving pans (not shown in the figure), which are respectively arranged below the first heat exchanger 13 and the second heat exchanger 14 to collect condensed water generated during dehumidification.

[0107] The water storage capacity of the water receiving tray is limited. When the water receiving tray is full of water, the water can be discharged to the outside of the outer shell 10 through a water pump.

[0108] The water tray has a water level detection module to control the water level of the water tray corresponding to the evaporator and control drainage when the water level reaches the set value.

[0109] The dehumidification effect of the air delivered to the room is related to the air flow and humidity content passing through the evaporator. In order to ensure the dehumidification effect, in some embodiments of the present invention, the air dehumidification device further includes: respectively obtaining the return air humidity content, the supply air humidity content and the target humidity content;

[0110] The supply air humidity content is compared with the target humidity content, and the air flow rates of the second reversing device leading to the first heat exchange chamber and the second heat exchange chamber respectively are adjusted according to the comparison result. When the difference between the supply air humidity content and the target humidity content is greater than the upper limit of the humidity content, the air flow rate of the second reversing device leading to the heat exchange chamber where the evaporator is located is increased. When the difference between the supply air humidity content and the target humidity content is less than the lower limit of the humidity content, the air flow rate of the second reversing device leading to the heat exchange chamber where the evaporator is located is reduced.

[0111] That is, when the difference between the humidity content of the supply air and the target humidity content is too large, dehumidification needs to be increased, which is achieved by increasing the air flow from the second reversing device to the heat exchange chamber where the evaporator is located.

[0112] When the difference between the supply air humidity content and the target humidity content is small, it means that the current supply air humidity content can meet the demand. The air flow to the heat exchange cavity where the condenser is located is appropriately increased in order to increase the supply air temperature, that is, to improve the comfort.

[0113] This solution timely adjusts the air flow to the heat exchange cavity where the evaporator is located by real-time judgment of the relationship between the supply air humidity content, the return air humidity content and the target humidity content, to ensure efficient dehumidification effect at all times.

[0114] In order to obtain the supply air humidity content, the return air humidity content and the target humidity content respectively, the air dehumidification device also includes:

[0115] The return air temperature detection module is used to detect the return air temperature.

[0116] The return air humidity detection module is used to detect the return air relative humidity.

[0117] The return air humidity content is determined based on the return air temperature and the return air relative humidity.

[0118] The supply air temperature detection module is used to detect the supply air temperature.

[0119] The supply air humidity detection module is used to detect the supply air relative humidity.

[0120] The moisture content of the supply air is determined according to the supply air temperature and the supply air relative humidity.

[0121] The corresponding moisture content can be determined according to the temperature and relative humidity using an existing algorithm, which will not be described in detail here.

[0122] If the user does not directly set the target moisture content but sets the target temperature and target relative humidity, the target moisture content can also be calculated based on the target temperature and target relative humidity.

[0123] In some embodiments of the present invention, the dehumidification mode also includes a partial fresh air reheat dehumidification mode and a full fresh air reheat dehumidification mode. When the outdoor air quality is not lower than the set value, the control executes the partial fresh air reheat dehumidification mode or the full fresh air reheat dehumidification mode. That is, when the outdoor air is better, the introduction of outdoor fresh air can help increase the oxygen content of the indoor air.

[0124] The partial fresh air reheat dehumidification mode and the fresh air reheat dehumidification mode include:

[0125] Open the outdoor air inlet valve 102.

[0126] The four connection ports of the first reversing device 20 are controlled to be connected to each other, and the four connection ports of the second reversing device 30 are controlled to be connected in pairs, so that the indoor return air port RA is connected to one of the heat exchange chambers, and the outdoor air inlet OA is connected to the other heat exchange chamber.

[0127] The operation of the refrigerant circulation system is controlled to ensure that the evaporator is located in a heat exchange chamber connected to the outdoor air inlet.

[0128] The outdoor fresh air enters the heat exchange chamber where the evaporator is located through the indoor air inlet OA for dehumidification to obtain dry and low-temperature air. The indoor return air enters the heat exchange chamber where the condenser is located through the indoor return air port RA for heating to obtain high-temperature air. The two airflows are mixed in the first reversing device 20 and exhausted to the room.

[0129] Fresh air reheat dehumidification mode also includes:

[0130] Open the outdoor exhaust air valve 101 and start the exhaust fan 70.

[0131] By opening the outdoor exhaust air valve 101 and the exhaust fan 70, part of the indoor return air is discharged to the outside through the outdoor exhaust port EA, thereby achieving the effect of exchanging fresh air for the indoor room.

[0132] In some embodiments of the present invention, it is also included to determine whether to execute a partial fresh air reheat dehumidification mode or a full fresh air reheat dehumidification mode based on the outdoor temperature. When the outdoor temperature is greater than the temperature limit, it is determined to execute the full fresh air reheat dehumidification mode; otherwise, it is determined to execute the partial fresh air reheat dehumidification mode.

[0133] When the outdoor temperature is low, the fresh air will cause the fresh air load to increase and the energy consumption to be too high. Controlling and executing the partial fresh air reheating and dehumidification mode can avoid the above problems.

[0134] When the outdoor temperature is relatively high, the outdoor temperature is not low at this time, and the fresh air will not cause the fresh air load to increase and the energy consumption to be excessive. Therefore, the fresh air reheating and dehumidification mode can be controlled to increase the fresh air volume for the indoor air and improve the oxygen content.

[0135] In some embodiments of the present invention, the air dehumidification device further comprises obtaining the humidity content of the supply air and the humidity content of the return air respectively.

[0136] Some fresh air reheat dehumidification modes also include:

[0137] First, an initial ratio of the fresh air volume to the return air volume is given, that is, the blower 80 operates according to the set air volume, and controls the first reversing device 20 or the second reversing device 30 to meet the preset ratio of the fresh air volume entering from the outdoor air inlet OA to the return air volume entering from the indoor return air outlet RA.

[0138] The supply air humidity content is compared with the return air humidity content, and the supply air temperature is compared with the return air temperature. When the difference between the supply air humidity content and the return air humidity content is greater than the set threshold and the supply air temperature is greater than the return air temperature, the ratio of the fresh air volume to the return air volume is adjusted.

[0139] Generally speaking, when the fresh air volume is large, the supply air temperature will be low, and when the return air volume is large, the supply air humidity content will increase. Therefore, in some embodiments of the present invention, the air volume can be adjusted according to the above principle.

[0140] This solution adjusts the ratio of fresh air volume to return air volume to ensure that the temperature and humidity of the supply air meet user needs at the same time.

[0141] In some embodiments of the present invention, the partial fresh air reheat dehumidification mode also includes determining whether the ratio of the actual detected fresh air volume to the actual detected return air volume meets the adjusted ratio. If it does not meet the ratio, the opening of the connecting ports of the first reversing device 20 and the first heat exchange chamber 11 and the second heat exchange chamber 12 are adjusted, thereby adjusting the fresh air volume entering from the outdoor air inlet OA and the return air volume entering from the indoor return air outlet RA.

[0142] In some embodiments of the present invention, the fresh air reheat dehumidification mode further includes:

[0143] The supply fan and exhaust fan operate according to their respective set air volumes;

[0144] The supply air humidity content is compared with the return air humidity content, and the supply air temperature is compared with the return air temperature. When the difference between the supply air humidity content and the return air humidity content is greater than the set threshold and the supply air temperature is greater than the return air temperature, the opening of the connecting port of the first reversing device and the first heat exchange chamber and the second heat exchange chamber are adjusted respectively.

[0145] For the regulation principle, please refer to the regulation principle of some fresh air reheat dehumidification modes.

[0146] This solution achieves the goal of simultaneously meeting the requirements of the moisture content and temperature of the supplied air by adjusting the openings of the connecting ports of the first reversing device and the first heat exchange chamber and the second heat exchange chamber.

[0147] Embodiment 2

[0148] There are many ways to implement the reversing device. In this embodiment, the first reversing device 20 is taken as an example for description.

[0149] like Figure 3 , Figure 4 As shown, the four connection ports of the first reversing device 20 are respectively the first connection port 201, the second connection port 202, the third connection port 203 and the fourth connection port 204, and the four connection ports are respectively connected to the valve cavity of the first reversing device 20. The four connection ports are respectively connected to the outdoor exhaust port EA, the indoor air supply port SA, the first heat exchange cavity 11 and the second heat exchange cavity 12.

[0150] The blocking portion can be implemented by a valve plate 205 , and the driving device 206 is controlled by the control module to drive the valve plate 205 to rotate.

[0151] When the valve plate 205 is rotated to different positions, the four connection ports can be connected accordingly.

[0152] The four connection ports of the second reversing device 30 are respectively the first connection port 301, the second connection port 302, the third connection port 303 and the fourth connection port 304, and the four connection ports are respectively connected to the valve cavity of the second reversing device 20. The four connection ports are respectively connected to the outdoor air inlet OA, the indoor return air inlet RA, the first heat exchange cavity 11 and the second heat exchange cavity 12.

[0153] In this embodiment, a specific connection method is provided, but it is not limited to the connection method in this embodiment.

[0154] The first connection port 201 of the first reversing device is connected to the indoor air supply port SA, the fourth connection port 204 of the first reversing device is connected to the outdoor air exhaust port EA, the second connection port 202 of the first reversing device is connected to the first heat exchange chamber 11, and the third connection port 203 of the first reversing device is connected to the second heat exchange chamber 12.

[0155] like Figure 5 As shown, the first reversing device 20 includes two side panels 207, 208 and a front panel 209 arranged opposite to each other, wherein two connection ports are opened on the two opposite side panels 207, 208, namely the first connection port 201 and the fourth connection port 204, and the other two connection ports are opened on the front panel 209, namely the second connection port 202 and the third connection port 203, and the rotation axis of the valve plate 205 is located between the second connection port 202 and the third connection port 203, so that the first connection port 201 can be connected with the second connection port 202 and the third connection port 203 can be connected with the fourth connection port 204, or the first connection port 201 can be connected with the third connection port 203 and the second connection port 202 can be connected with the fourth connection port 204.

[0156] In some embodiments, the two side panels 207 and 208 disposed opposite to each other are arc surfaces, and the axial direction of the arc surfaces is perpendicular to the front panel 209. The third interface 203 is located above the second interface 202. Of course, the third interface 203 can also be located below the second interface 202.

[0157] The rotation axis of the valve plate 205 is located at the center of the valve plate 205 and is coaxially arranged with the two arc surfaces. Figure 6 As shown, the valve plate 205 rotates along the arc surface. When it rotates to position I, the first connection port 201 is connected to the third connection port 203, and the second connection port 202 is connected to the fourth connection port 204. When the valve plate 205 rotates to position II, the first connection port 201 is connected to the second connection port 202, and the third connection port 203 is connected to the fourth connection port 204. Figure 7 As shown, when the valve plate 205 rotates to a horizontal position, the first connection port 201 , the third connection port 203 , the second connection port 202 and the fourth connection port 204 are interconnected.

[0158] The first connection port 301 of the second reversing device 30 is connected to the indoor return air port RA, the fourth connection port 304 of the second reversing device is connected to the outdoor air inlet OA, the second connection port 302 of the second reversing device is connected to the first heat exchange chamber 11, and the third connection port 303 of the second reversing device is connected to the second heat exchange chamber 12.

[0159] The structure of the second reversing device 30 is similar to that of the first reversing device 20 , and will not be described in detail herein.

[0160] Embodiment 3

[0161] This embodiment provides a specific implementation scheme of the internal circulation reheat dehumidification mode.

[0162] This embodiment is described by taking the reversing device in the second embodiment as an example.

[0163] In this embodiment, the second connection port 302 of the second reversing device 30 and the second connection port 202 of the first reversing device 20 are respectively connected to the first heat exchange chamber 11, and the third connection port 303 of the second reversing device 30 and the third connection port 203 of the first reversing device 20 are respectively connected to the second heat exchange chamber 12.

[0164] State 1: The state in which the four-way valve is controlled with the second heat exchanger 14 serving as the evaporator.

[0165] like Figure 8 As shown, when the internal circulation reheat dehumidification mode is executed, the exhaust fan 70 is turned off, the outdoor exhaust air valve 101 is turned off, and the outdoor air inlet air valve 102 is turned off. The air volume ratio of the evaporator and condenser sides is controlled by the reversing device, and the valve plate opening of the reversing device is determined according to the size of the indoor dehumidification amount, including the opening of the valve plate 205 of the first reversing device and the valve plate 305 of the second reversing device.

[0166] The opening angle of the valve plate 205 of the first reversing device 20 is α4 (eg Figure 7 As shown, i.e. in a horizontal position), the four connection ports of the first reversing device 20 are connected to each other. The air supply volume of the blower 80 is detected; the supply air humidity content dSA, the return air humidity content dRA and the target humidity content dset are obtained respectively.

[0167] Refer to Table 1 and Fig. 9 , Fig.10 As shown, the initial opening angle of the valve plate 305 of the second reversing device 30 is αi; after 10 minutes, the relationship between the supply air humidity content dSA and the set target humidity content dset is determined, and the opening angle of the valve plate 305 of the second reversing device 30 is adjusted.

[0168] (1) If dSA>dset+(dRA-dset)*5%, the opening angle of the second reversing device 30 is adjusted to α(i-1). That is, the humidity is high at this time, and the opening between 301 and 303 is increased to allow more return air to pass through the evaporator for dehumidification; then the relationship between dSA and dset is judged again until the condition that the opening angle remains unchanged is met.

[0169] (2) If dset - (dRA - dset) * 5% ≤ dSA ≤ dset + (dRA - dset) * 5%, the opening angle of the second reversing device 30 remains unchanged; and then the relationship between dSA and dset is returned again.

[0170] (3) If dSA<dset - (dRA-dset)*5%, the opening angle of the second reversing device 30 is adjusted to α(i+1); that is, the humidity is low at this time, and the opening between 301 and 302 is increased, so that more return air is heated by the condenser, and the supply air temperature is increased while meeting the humidity requirements, thereby further improving the user comfort. Then, the relationship between dSA and dset is judged again until the condition that the opening angle remains unchanged is met.

[0171] like Fig.10 As shown, the valve plate status in the reversing device is as follows:

[0172] The first reversing device 20 : the valve plate 205 is in a horizontal state, and is used for mixing the two air paths coming out of the third connecting port 203 and the second connecting port 202 .

[0173] The second reversing device 30: The angle of the valve plate 305 is controlled by the dehumidification amount and is used to distribute the air flow of the two air ducts; the opening angle of the valve plate 305 directly affects the air volume distribution. As shown in the following Table 1:

[0174]

[0175] Table 1

[0176] Among them, α3~-α3 can be found in Fig. 9 shown.

[0177] like Fig.10As shown, the air flow path in state 1, the indoor air enters the second reversing device 30 from the indoor return air port RA, and is divided into two paths in the second reversing device 30: one path flows from the third connection port 303 of the second reversing device to the second heat exchanger 14 (the heat exchanger acts as an evaporator at this time), the air is cooled and the temperature is reduced (the temperature is reduced, the moisture content is reduced), the condensed water flows into the water receiving tray, and is discharged by the water pump, and then enters the first reversing device 20 from the third connection port 203 of the first reversing device, and then flows from the first connection port 201 of the first reversing device to the indoor supply air port SA, and is mixed with the air flowing out from the second connection port 202 of the first reversing device at the first connection port 201 of the first reversing device.

[0178] The other path flows from the second connection port 302 of the second reversing device to the first heat exchanger 13 (the heat exchanger acts as a condenser at this time), the air is heated, and then enters the first reversing device from the second connection port 202 of the first reversing device, and then flows from the first connection port 201 of the first reversing device to the indoor air supply port SA, and is mixed with the air flowing out from the third connection port 203 of the first reversing device at the first connection port 201 of the first reversing device.

[0179] State 2: The state in which the four-way valve is controlled with the first heat exchanger 13 serving as the evaporator.

[0180] like Fig.11 As shown, the exhaust fan 70 is turned off, the outdoor exhaust air valve 101 is closed, and the outdoor air inlet air valve 102 is closed.

[0181] The first reversing device 20 is opened at an angle of α4 (ie, a horizontal position) to detect the air volume of the blower 80; detect the current indoor temperature and the supply air humidity dSA, the return air humidity dRA, and the target humidity dset.

[0182] The opening angle of the second reversing device 30 is αi; after 10 minutes, the relationship between the supply air humidity content dSA and the set target humidity content dset is determined, and the opening angle of the second reversing device 30 is adjusted.

[0183] (1) If dSA>dset+(dRA-dset)*5%, the opening angle of the second reversing device 30 is adjusted to α(i+1), that is, the opening of the connecting port between 301 and 302 is increased so that more return air passes through the evaporator for dehumidification; then the relationship between dSA and dset is judged again until the condition that the opening angle remains unchanged is met.

[0184] (2) If dset - (dRA - dset) * 5% ≤ dSA ≤ dset + (dRA - dset) * 5%, the opening angle of the second reversing device 30 remains unchanged; and then the relationship between dSA and dset is returned again.

[0185] (3) If dSA < dset - (dRA - dset) * 5%, the opening angle of the second reversing device 30 is adjusted to α(i-1); that is, the opening of the connecting port between 301 and 303 is increased, so that more return air can pass through the evaporator to be heated while meeting the humidity requirements, so as to reduce the feeling of cold air and improve comfort; then return to judge the relationship between dSA and dset again until the condition of maintaining the opening angle unchanged is met.

[0186] like Fig.12 The air flow path in state 2 is shown.

[0187] Embodiment 4

[0188] This embodiment provides a specific implementation plan for a partial fresh air reheat dehumidification mode.

[0189] This embodiment is described by taking the reversing device in the second embodiment as an example.

[0190] When the outdoor air condition is good but the outdoor temperature is low, fresh air will cause the fresh air load to increase and the energy consumption to be too high. If only dehumidification is performed at this time, the supply air temperature will be low. In order to increase the supply air temperature, the indoor air is introduced into the condenser side, and the heat of the condenser is used to heat the air. Then, it is mixed with the cooled and dehumidified fresh air in front of the indoor air supply outlet SA. This can both dehumidify the fresh air and increase the supply air temperature.

[0191] State 1: The state in which the four-way valve is controlled with the first heat exchanger 13 serving as the evaporator.

[0192] like Fig.13 As shown, the exhaust fan 70 is turned off, the outdoor exhaust air valve 101 is closed, and the outdoor inlet air valve 102 is opened.

[0193] The first reversing device 20 is opened at an angle of α4 (i.e., horizontal position), and the second reversing device 30 is opened at α7; the blower 80 operates at a set air volume, such as 300m3 / h, and the unit initially operates at a preset ratio of fresh air volume QOA to return air volume QRA, such as QOA / QRA =1:2.

[0194] Step 1: Determine whether the supply air temperature and humidity content meet the requirements.

[0195] After stabilization, determine whether ①dSA<dRA-β and ②TSA>TRA are satisfied at the same time. If not, adjust the ratio of fresh air volume to return air volume λ. After each adjustment, return to determine whether the above requirements of humidity and temperature are met. Until they are met, the ratio of fresh air volume to return air volume remains unchanged. Among them, dSA is the humidity content of supply air, dRA is the humidity content of return air, TSA is the supply air temperature, and TRA is the return air temperature.

[0196] When the total air supply volume is constant, if the supply air humidity content dSA is higher than the set limit, the supply air humidity content can be reduced by increasing the air volume passing through the evaporator.

[0197] Step 2: Determine whether the actual air volume detection value is consistent with the above ratio

[0198] Get the return air volume QRA of the indoor return air outlet RA, and determine whether it is equal to or close to (QSA *1 / (1+λ))*(1±10%). If not, adjust the opening angle of the first reversing device 20 until the above conditions are met. QSA=QRA+QOA, QOA:QRA=λ.

[0199] The return air volume QRA of the indoor return air outlet RA can be obtained by the pressure difference sensor 103 arranged at the indoor return air outlet RA.

[0200] like Fig.14 The air flow path in state 1 is shown.

[0201] Fresh air channel: outdoor fresh air enters the fourth connection port 304 of the second reversing device from the outdoor air inlet OA, and then reaches the first heat exchanger 13 from the second connection port 302 of the second reversing device. After cooling and dehumidification by the first heat exchanger 13, water condenses from the air, flows through the water collection pan and is discharged by the drainage pump; in this way, the fresh air after cooling and dehumidification reaches the second connection port 202 of the first reversing device, and then reaches the first connection 201 of the first reversing device, and finally is sent in by the blower 80 through the indoor air supply port SA.

[0202] Internal circulation channel: Indoor air enters the first connection port 301 of the second reversing device from the indoor return air RA, and then reaches the second heat exchanger 14 from the third connection port 303 of the second reversing device. After being heated by the second heat exchanger 14, the temperature increases; then it reaches the third connection port 203 of the first reversing device, and then reaches the first connection port 201 of the first reversing device (mixed with the fresh air here), and finally the air blower 80 delivers the fresh air into the indoor air supply port SA.

[0203] In state 2, the state of the four-way valve is controlled with the second heat exchanger 14 as the evaporator. The principle of state 2 of this mode is similar to that of state 1, except that the functions of the two heat exchangers are interchanged and the corresponding refrigerant flow channels are interchanged, which will not be described in detail here.

[0204] Embodiment 5

[0205] This embodiment provides a specific implementation plan for the fresh air reheat dehumidification mode.

[0206] This embodiment is described by taking the reversing device in the second embodiment as an example.

[0207] At this time, the outdoor temperature is not low (5~15℃), and the fresh air will not increase the fresh air load and consume too much energy. At this time, dehumidifying the fresh air will also cause the treated fresh air temperature to be low. At the same time, the amount of fresh air introduced is large, and the indoor positive pressure is large. Therefore, in this case, part of the air needs to be discharged. In order to increase the supply air temperature, part of the exhaust air is mixed with the fresh air after cooling and dehumidification before the indoor air outlet SA, which can both dehumidify the fresh air and increase the supply air temperature.

[0208] State 1: The state in which the four-way valve is controlled with the first heat exchanger 13 serving as the evaporator.

[0209] like Fig.15 As shown, after entering the fresh air reheat dehumidification mode, the exhaust fan 70 is turned on, the outdoor exhaust air valve 101 is opened, and the outdoor air inlet air valve 102 is opened.

[0210] The first reversing device 20 is opened at an angle of α4 (ie, horizontal position), and the second reversing device 30 is opened at α7; the supply fan 80 operates at a set air volume QSA, such as 300 m3 / h, and the exhaust fan 70 operates at a set air volume QEA, such as 200 m3 / h.

[0211] Step 1: Determine whether the supply air temperature and humidity content meet the requirements.

[0212] After stabilization, it is determined whether ①dSA<dRA-β and ②TSA>TRA are satisfied at the same time. If not, the first reversing device adjusts the opening angle, and after each adjustment, it returns to determine whether the above-mentioned moisture content and temperature requirements are met; until they are satisfied, the opening angle remains unchanged.

[0213] Step 2: Determine whether the actual air volume detection value is consistent with the above ratio

[0214] Determine whether the pressure difference sensor detection value QRA is equal to QSA. If not, adjust the speed of the exhaust fan 70. After each adjustment, return to determine whether the above air volume requirements are met until they are met; and return to the first step again to determine whether ①dSA<dRA-β and ② TSA>TRA are met at the same time.

[0215] like Fig.16 The air flow path in state 1 is shown.

[0216] Fresh air channel: outdoor fresh air enters the fourth connection port 304 of the second reversing device from the outdoor air inlet OA, and then reaches the first heat exchanger 13 from the second connection port 302 of the second reversing device. After cooling and dehumidification by the first heat exchanger 13, water condenses from the air, flows through the water collection pan and is discharged by the drainage pump; in this way, the fresh air after cooling and dehumidification reaches the second connection port 202 of the first reversing device, and then reaches the first connection port 201 of the first reversing device, and finally is sent in by the blower 80 through the indoor air supply port SA.

[0217] Exhaust channel: Indoor air enters the first connection port 301 of the second reversing device from the indoor return air RA, and then reaches the second heat exchanger 14 from the third connection port 303 of the second reversing device. After being heated by the second heat exchanger 14, the temperature increases; then it reaches the third connection port 203 of the first reversing device, and then is divided into two parts, one part flows to the first connection port 201 of the first reversing device, mixes with the fresh air here, and finally the fresh air is delivered into the room by the air supply fan 80 through the indoor air supply port SA; the other part flows to the exhaust fan 70 and is discharged to the outside through the outdoor exhaust port EA.

[0218] In state 2, the state of the four-way valve is controlled with the second heat exchanger 14 as the evaporator. The principle of state 2 of this mode is similar to that of state 1, except that the functions of the two heat exchangers are interchanged and the corresponding refrigerant flow channels are interchanged, which will not be described in detail here.

[0219] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An air dehumidification device, characterized in that: include: An outer shell is formed with an outdoor air inlet, an outdoor air outlet, an indoor air supply outlet and an indoor air return outlet, and the outer shell has a first heat exchange cavity and a second heat exchange cavity; The heat exchanger comprises a first heat exchanger disposed in the first heat exchange cavity and a second heat exchanger disposed in the second heat exchange cavity; A compressor, which is connected to two heat exchangers respectively through a four-way valve to form a refrigerant circulation flow path; The reversing device comprises a first reversing device and a second reversing device, wherein the first reversing device has four connecting ports, which are respectively connected to an outdoor air outlet, an indoor air supply port, a first heat exchange cavity and a second heat exchange cavity, and the second reversing device has four connecting ports, which are respectively connected to an outdoor air inlet, an indoor air return port, a first heat exchange cavity and a second heat exchange cavity; Outdoor temperature detection module, used to detect outdoor temperature; Outdoor humidity detection module, used to detect outdoor relative humidity; Air quality detection module, used to detect outdoor air quality; The control module is configured to: when the outdoor temperature and the outdoor relative humidity meet the dehumidification conditions, control the dehumidification to start, and determine the dehumidification mode according to the outdoor air quality; The air dehumidification device also includes: An outdoor exhaust air valve, which is arranged in the outdoor exhaust port; An outdoor air inlet valve, which is arranged in the outdoor air inlet; The dehumidification mode includes an internal circulation reheat dehumidification mode. When the outdoor air quality is lower than a set value, the internal circulation reheat dehumidification mode is controlled to be executed, including: Close the outdoor exhaust air valve and the outdoor air inlet air valve; The four connection ports of the second reversing device are controlled to be interconnected. The indoor return air entering the second reversing device from the indoor return air port enters the first heat exchange chamber in one way and the second heat exchange chamber in another way. The indoor return air that has exchanged heat in the first heat exchange chamber and the second heat exchange chamber respectively enters the first reversing device for mixed air and is then discharged from the indoor supply air port.

2. The air dehumidification device according to claim 1, characterized in that: The dehumidification device also includes: An exhaust fan, which is arranged at the outdoor exhaust port; A blower fan, which is arranged at the indoor air outlet; When the control module controls dehumidification, the four connection ports of the first reversing device are controlled to be connected to each other, and the operation of the refrigerant circulation system is controlled. One heat exchanger is used as an evaporator, and the other heat exchanger is used as a condenser. The air passing through the evaporator is dehumidified, and the air passing through the condenser is heated. All or part of the air from the two routes is mixed in the first reversing device and discharged into the room through the indoor air supply port.

3. The air dehumidification device according to claim 1, characterized in that: The air dehumidification device also includes: Obtain return air humidity content, supply air humidity content and target humidity content respectively; The supply air humidity content is compared with the target humidity content, and the air flow rates of the second reversing device to the first heat exchange chamber and the second heat exchange chamber are adjusted according to the comparison result. When the difference between the supply air humidity content and the target humidity content is greater than the upper limit of the humidity content, the air flow rate of the second reversing device to the heat exchange chamber where the evaporator is located is increased. When the difference between the supply air humidity content and the target humidity content is less than the lower limit of the humidity content, the air flow rate of the second reversing device to the heat exchange chamber where the evaporator is located is reduced.

4. The air dehumidification device according to claim 3, characterized in that: The air dehumidification device also includes: A return air temperature detection module, which is used to detect the return air temperature; Return air humidity detection module, which is used to detect the return air relative humidity; Determining the return air moisture content according to the return air temperature and the return air relative humidity; A supply air temperature detection module, which is used to detect the supply air temperature; A supply air humidity detection module, which is used to detect the supply air relative humidity; The moisture content of the supply air is determined according to the supply air temperature and the supply air relative humidity.

5. The air dehumidification device according to claim 2, characterized in that: The dehumidification mode also includes a partial fresh air reheat dehumidification mode and a full fresh air reheat dehumidification mode. When the outdoor air quality is not lower than the set value, the partial fresh air reheat dehumidification mode or the full fresh air reheat dehumidification mode is controlled to be executed, including: Open the outdoor air inlet valve; Control the four connection ports of the first reversing device to be connected to each other, and control the four connection ports of the second reversing device to be connected to each other, so that the four connection ports of the second reversing device are connected in pairs, so that the indoor return air port is connected to one of the heat exchange chambers, and the outdoor air inlet is connected to the other heat exchange chamber; Controlling the operation of the refrigerant circulation system to ensure that the evaporator is located in a heat exchange chamber connected to the outdoor air inlet; The fresh air reheating and dehumidification mode also includes: Open the outdoor exhaust damper and start the exhaust fan.

6. The air dehumidification device according to claim 5, characterized in that: The execution of partial fresh air reheat dehumidification mode or full fresh air reheat dehumidification mode is determined according to the outdoor temperature. When the outdoor temperature is greater than the temperature limit, the execution of the full fresh air reheat dehumidification mode is determined; otherwise, the execution of the partial fresh air reheat dehumidification mode is determined.

7. The air dehumidification device according to claim 5, characterized in that: The air dehumidification device also includes: Obtain the humidity content of supply air and return air respectively; The partial fresh air reheating and dehumidification mode also includes: The blower operates according to the set air volume, and controls the first reversing device or the second reversing device to meet the ratio of the fresh air volume entering from the outdoor air inlet to the return air volume entering from the indoor return air inlet to a preset value; The supply air humidity content is compared with the return air humidity content, and the supply air temperature is compared with the return air temperature. When the difference between the supply air humidity content and the return air humidity content is greater than the set threshold and the supply air temperature is greater than the return air temperature, the ratio of the fresh air volume to the return air volume is adjusted.

8. The air dehumidification device according to claim 7, characterized in that: The fresh air reheating and dehumidification mode also includes: The supply fan and exhaust fan operate according to their respective set air volumes; The supply air humidity content is compared with the return air humidity content, and the supply air temperature is compared with the return air temperature. When the difference between the supply air humidity content and the return air humidity content is greater than the set threshold and the supply air temperature is greater than the return air temperature are not simultaneously satisfied, the opening of the connecting port between the first reversing device and the first heat exchange chamber and the second heat exchange chamber is adjusted.

9. The air dehumidification device according to claim 7, characterized in that: The partial fresh air reheat dehumidification mode also includes judging whether the ratio of the actual detected fresh air volume to the actual detected return air volume meets the adjusted ratio. If it does not meet the ratio, the opening of the connecting port of the first reversing device and the first heat exchange chamber and the second heat exchange chamber is adjusted respectively.

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