An air conditioning device

Abstract

The application discloses an air conditioning device, comprising: an outer shell body, an outdoor air inlet, an outdoor air outlet, an indoor air supply outlet and an indoor return air outlet are formed on the outer shell body, a first heat exchange cavity and a second heat exchange cavity are formed in the outer shell body; a first adsorption member; a second adsorption member; a first switching device connected with the outdoor air inlet, the indoor return air outlet, the first heat exchange cavity and the second heat exchange cavity respectively; a second switching device connected with the outdoor air outlet, the indoor air supply outlet, the first heat exchange cavity and the second heat exchange cavity respectively; a compressor connected with a heat exchanger through a four-way valve to form a refrigerant circulation flow path; a control module for controlling the communication state between four connection ports of each switching device and / or the refrigerant flow direction of the refrigerant circulation flow path. The air conditioning device can effectively solve the technical problem that the supply air temperature of fresh air is relatively high caused by the fact that the adsorption material adsorbs moisture while releasing latent heat of vaporization.

Description

TECHNICAL FIELD

[0001] The present application relates to the air conditioning field, in particular to an air conditioning device. BACKGROUND

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

[0003] At present, some fresh air products in the industry have dehumidification function, and the existing solid adsorption technology is generally used for dehumidification. Since the adsorbent material is coated on the surface of the heat exchanger or placed in the heat exchanger or downstream, at this time, the fresh air duct and the exhaust air duct need to be exchanged according to the specified time to realize continuous dehumidification or humidification.

[0004] Problems existing in the prior art:

[0005] 1. The adsorbent material is placed behind the heat exchanger. When dehumidifying in summer, the moisture content of the fresh air decreases after being adsorbed by the adsorbent material, and the temperature increases at the same time, which is caused by the release of latent heat of vaporization of the adsorbent material while adsorbing water. Therefore, the supply air temperature of the fresh air is relatively high (higher than the indoor air temperature); at the same time, it is easy to cause the problem of excessive dehumidification. And when dehumidifying in summer, due to the high outdoor temperature, the exhaust pressure is prone to be too high.

[0006] 2. When the fresh air duct and the exhaust air duct are reversed, the refrigerant needs to be reversed at the same time. During the refrigerant reversing process, due to the high and low pressure difference of the refrigeration system, the reversing noise of the four-way valve will be large.

[0007] 3. After the refrigerant is reversed, the condenser becomes an evaporator and needs to offset the heat left in the heat exchanger in the last cycle, so there is a problem of heat offset. Similarly, when the evaporator becomes a condenser, the same problem exists.

[0008] 4. In the transition season or the spring-summer transition and the summer-autumn transition, due to the small dehumidification amount, how to meet the target and save energy. SUMMARY

[0009] In order to solve the technical problem that the adsorbent is arranged downstream of the heat exchanger in the prior art, and the supply air temperature increases in the dehumidification mode due to latent heat after dehumidification or humidification by the adsorbent, an air conditioning device is provided, which can solve the above problems.

[0010] To achieve the above purpose, the embodiments of the present application adopt the following technical solutions:

[0011] The present application provides an air conditioning device, comprising:

[0012] An outer shell body is formed with an outdoor air inlet, an outdoor air outlet, an indoor air supply outlet and an indoor air return outlet, and a first heat exchange cavity and a second heat exchange cavity are formed in the outer shell body;

[0013] A first suction member is arranged in the first heat exchange cavity and is respectively arranged with a heat exchanger on both sides;

[0014] A second suction member is arranged in the second heat exchange cavity and is respectively arranged with a heat exchanger on both sides;

[0015] A second switching device has four connection ports and is respectively connected with the outdoor air outlet, the indoor air supply outlet, the first heat exchange cavity and the second heat exchange cavity;

[0016] A first switching device is used for controlling the communication state of the outdoor air inlet and the indoor air return outlet with the two heat exchange cavities;

[0017] A second switching device is used for controlling the communication state of the outdoor air outlet and the indoor air supply outlet with the two heat exchange cavities; a compressor is connected with four heat exchangers through a four-way valve to form a refrigerant circulation flow path;

[0018] A control module is used for controlling the communication state of each switching device and / or the refrigerant flow direction of the refrigerant circulation flow path.

[0019] In some embodiments of the present application, the air conditioning device further comprises:

[0020] A first humidity detection module is arranged in the first heat exchange cavity and is located upstream of the first suction member in the airflow direction;

[0021] A first temperature and humidity detection module is arranged in the first heat exchange cavity and is located downstream of the first suction member in the airflow direction;

[0022] A second humidity detection module is arranged in the second heat exchange cavity and is located upstream of the second suction member in the airflow direction;

[0023] A second temperature and humidity detection module is arranged in the second heat exchange cavity and is located downstream of the second suction member in the airflow direction.

[0024] In some embodiments of the present application, the heat exchangers arranged on both sides of the first suction member are respectively:

[0025] A first heat exchanger is arranged in the first heat exchange cavity and is located upstream of the first suction member in the airflow direction;

[0026] A second heat exchanger is arranged in the first heat exchange cavity and is located downstream of the first suction member in the airflow direction;

[0027] The heat exchangers located on both sides of the second suction attachment are respectively:

[0028] The third heat exchanger is arranged in the second heat exchange cavity and is located upstream of the second suction attachment in the air flow direction.

[0029] The fourth heat exchanger is arranged in the second heat exchange cavity and is located downstream of the second suction attachment in the air flow direction.

[0030] In some embodiments of the present application, the port D and the port S of the four-way valve are respectively connected to the suction port and the discharge port of the compressor one by one, and the air conditioning device further comprises:

[0031] The first electric three-way valve has three ports connected to the port C of the four-way valve, the first port of the first heat exchanger and the second port of the second heat exchanger respectively.

[0032] The port C of the four-way valve is further connected to the first port of the second heat exchanger, and the first electric three-way valve is controlled by the control module to communicate the first port of the first heat exchanger with the second port of the second heat exchanger or to communicate the first port of the first heat exchanger with the port C of the four-way valve.

[0033] The second port of the first heat exchanger is connected to the first port of the third heat exchanger through an electronic expansion valve.

[0034] The second electric three-way valve has three ports connected to the port E of the four-way valve, the second port of the third heat exchanger and the first port of the fourth heat exchanger respectively.

[0035] The port E of the four-way valve is further connected to the second port of the fourth heat exchanger, and the second electric three-way valve is controlled by the control module to communicate the second port of the third heat exchanger with the first port of the fourth heat exchanger or to communicate the second port of the third heat exchanger with the port E of the four-way valve.

[0036] In some embodiments of the present application, the adjustment mode of the air conditioning device includes a dehumidification mode and a humidification mode, and when the adjustment mode is the dehumidification mode, the control module is configured to:

[0037] Start the compressor, control the refrigerant flow direction through the four-way valve, and use one of the first heat exchanger and the third heat exchanger as a condenser and the other as an evaporator, and control the second reversing device and the first reversing device to act, so that the outdoor air inlet and the indoor air outlet are respectively communicated with the heat exchange cavity where the evaporator is located, and the indoor return air outlet and the outdoor air outlet are respectively communicated with the heat exchange cavity where the condenser is located.

[0038] When the adjustment mode is the humidification mode, the control module is configured to:

[0039] starting the compressor, controlling the refrigerant flow direction through the four-way valve, one of the first heat exchanger and the third heat exchanger serving as a condenser and the other serving as an evaporator, simultaneously controlling the second reversing device and the first reversing device to act, and connecting the outdoor air inlet and the indoor air outlet to the heat exchange cavity where the condenser is located, and connecting the indoor air return and the outdoor air outlet to the heat exchange cavity where the evaporator is located.

[0040] In some embodiments of the present application, the dehumidification mode includes a single dehumidification mode and a dehumidification and refrigeration dual adjustment mode, and the humidification mode includes a single humidification mode and a humidification and heating dual adjustment mode, when the adjustment mode is the single dehumidification mode or the single humidification mode, the control module is configured to:

[0041] controlling the first electric three-way valve to connect the first port of the first heat exchanger to port C of the four-way valve, and controlling the second electric three-way valve to connect the second port of the third heat exchanger to port E of the four-way valve;

[0042] When the adjustment mode is the dehumidification and refrigeration dual adjustment mode or the humidification and heating dual adjustment mode, the control module is configured to:

[0043] controlling the first electric three-way valve to connect the first port of the first heat exchanger to the second port of the second heat exchanger, and controlling the second electric three-way valve to connect the second port of the third heat exchanger to the first port of the fourth heat exchanger.

[0044] In some embodiments of the present application, the determination method of the two modes of the dehumidification mode includes:

[0045] obtaining a humidity coefficient α, when the humidity coefficient α is greater than a lower limit value, entering the single dehumidification mode, otherwise, entering the dehumidification and refrigeration dual adjustment mode;

[0046] The method for obtaining the humidity coefficient α is:

[0047]

[0048] Wherein, doa,aver is the average humidity content of the air conditioning device in the summer season;

[0049] din is the current indoor air humidity content;

[0050] doa is the outdoor air humidity content;

[0051] The determination method of the two modes of the humidification mode includes:

[0052] obtaining the indoor air supply temperature Tsa;

[0053] When the indoor air supply temperature Tsa is not less than a set upper limit value, the single humidification mode is entered, otherwise, the humidification and heating dual regulation mode is entered.

[0054] In some embodiments of the present application, the dehumidification and refrigeration dual regulation mode comprises temperature control priority logic and humidity control priority logic;

[0055] The temperature control priority logic comprises:

[0056] The compressor is started at a high frequency, and after running for a set time, the indoor air supply temperature Tsa is judged, and whether the indoor air supply temperature Tsa meets a set temperature value is judged. If not, the frequency of the compressor is reduced until the indoor air supply temperature Tsa meets the set temperature value;

[0057] Whether the humidity in the heat exchange cavity connected to the indoor air supply port meets a set humidity value is judged. If not, the frequency of the compressor is increased, otherwise, the current running state is maintained;

[0058] The humidity control priority logic comprises:

[0059] The compressor is started at a high frequency, and after running for a set time, the indoor air supply humidity dsa is judged, and whether the indoor air supply humidity dsa meets a first set humidity value is judged. If not, the frequency of the compressor is increased by 1 Hz until the first set humidity value is met;

[0060] Whether the indoor air supply temperature Tsa meets a second set temperature value is judged. If not, the frequency of the compressor is increased by 1 Hz; if yes, the current state is maintained.

[0061] In some embodiments of the present application, the control module is further configured to:

[0062] The humidity of the first suction accessory or the humidity of the second suction accessory is obtained, and when the humidity meets a set limit value, the second switching device and the first switching device are controlled to switch the heat exchange cavities through which the air supply and the exhaust air flow, and the four-way valve is controlled to switch the flow direction of the refrigerant.

[0063] In some embodiments of the present application, before the second switching device and the first switching device are switched, the method further comprises:

[0064] The running frequency of the compressor is unchanged, the opening of the electronic expansion valve is adjusted to V2, and then the opening of the electronic expansion valve is reduced to V1 after the second switching device and the first switching device are switched, and the setting time is maintained;

[0065] Or,

[0066] The opening degree of the electronic expansion valve is unchanged, the compressor frequency is reduced to F1, and then the compressor frequency is increased to F2 after the second reversing device and the first reversing device are reversed, and the setting time is continued.

[0067] The technical scheme of the present application has the following technical effects relative to the prior art:

[0068] The air conditioning device of the present application can effectively solve the technical problem of high supply air temperature of fresh air caused by the release of latent heat of vaporization by the adsorbent material while adsorbing moisture, by setting a heat exchanger upstream and downstream of the adsorption accessory, and the downstream heat exchanger can cool the airflow again after the fresh air passes through the adsorption accessory. BRIEF DESCRIPTION OF DRAWINGS

[0069] Figure 1 is a structural schematic diagram of an embodiment of the air conditioning device of the present application;

[0070] Figure 2 is a structural schematic diagram of an embodiment of the air conditioning device of the present application combined with a refrigerant system;

[0071] Figure 3 is a schematic diagram of the airflow direction in the summer dehumidification state 1 of an embodiment of the air conditioning device of the present application;

[0072] Figure 4 is a schematic diagram of the airflow direction in the summer dehumidification state 2 of an embodiment of the air conditioning device of the present application;

[0073] Figure 5 is a schematic diagram of the airflow direction in the winter humidification state 1 of an embodiment of the air conditioning device of the present application;

[0074] Figure 6 is a schematic diagram of the airflow direction in the winter humidification state 2 of an embodiment of the air conditioning device of the present application;

[0075] Figure 7 is a control flowchart of a single humidity control mode of an embodiment of the air conditioning device of the present application;

[0076] Figure 8 is a control flowchart of a humidity and temperature dual regulation mode of an embodiment of the air conditioning device of the present application;

[0077] Figure 9 is a control flowchart of an automatic supply air control mode of an embodiment of the air conditioning device of the present application;

[0078] Figure 10is a flow chart of a method for determining a single humidity control mode and a double regulation mode in an embodiment of the air conditioning device proposed in the present application;

[0079] Figure 11 is a flow chart of a method for solving system high pressure control in an embodiment of the air conditioning device proposed in the present application;

[0080] Figure 12 is a regulation schematic diagram of electronic expansion valve regulation and noise reduction in an embodiment of the air conditioning device proposed in the present application;

[0081] Figure 13 is a regulation schematic diagram of compressor frequency regulation and noise reduction in an embodiment of the air conditioning device proposed in the present application. DETAILED DESCRIPTION

[0082] In order to make the purpose and implementation of the present application more clear, the exemplary implementation of the present application will be described clearly and completely in the following with reference to the drawings in the exemplary implementation of the present application. Obviously, the described exemplary implementation is only a part of the implementation of the present application, but not all of the implementation of the present application.

[0083] It should be noted that the brief description of the terms in the present application is only for the convenience of understanding the implementation described next, but is not intended to limit the implementation of the present application. Unless otherwise specified, these terms should be understood according to their ordinary and general meanings.

[0084] In the description of the present application, it should be understood that the orientation or position relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0085] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In the description of the above implementation, the specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0086] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0087] Example 1

[0088] This embodiment proposes an air conditioning device, such as... Figure 1 As shown, it includes an outer shell 11, a first adsorption member 12, a second adsorption member 13, a first reversing device 14, a second reversing device 15, a compressor 16, and a control module (not shown in the figure). An outdoor air inlet OA, an outdoor air outlet EA, an indoor air supply outlet SA, and an indoor return air outlet RA are formed on the outer shell 11. A first heat exchange chamber 111 and a second heat exchange chamber 112 are formed inside the outer shell 11.

[0089] In some embodiments, the first adsorption member 12 is disposed in the first heat exchange chamber 111, and a heat exchanger is disposed on each of the two sides.

[0090] In some embodiments, the second adsorption member 13 is disposed in the second heat exchange chamber 112, and a heat exchanger is disposed on each of its two sides.

[0091] In some embodiments, the first reversing device 14 is used to control the connection status of the outdoor air inlet and the indoor return air inlet with the two heat exchange chambers, respectively. Specifically, the first reversing device 14 can be controlled to connect the outdoor air inlet OA with the first heat exchange chamber 111 and the indoor return air inlet RA with the second heat exchange chamber 112, or connect the outdoor air inlet OA with the second heat exchange chamber 112 and the indoor return air inlet RA with the first heat exchange chamber 111.

[0092] In some embodiments, the second reversing device 15 is used to control the connection status of the outdoor exhaust vent and the indoor air supply vent with the two heat exchange chambers, respectively. Specifically, the second reversing device 15 can be controlled to connect the outdoor exhaust vent EA with the first heat exchange chamber 111 and the indoor air supply vent SA with the second heat exchange chamber 112, or connect the outdoor exhaust vent EA with the second heat exchange chamber 112 and the indoor air supply vent SA with the first heat exchange chamber 111.

[0093] The second reversing device 15 and the first reversing device 14 should control the reversing in the same way. They can connect the outdoor air inlet OA with the indoor air outlet SA to form a fresh air duct, so as to deliver the outdoor fresh air to the room after adjustment. They can also connect the outdoor exhaust outlet EA with the indoor return air outlet RA to form a return air duct, so as to discharge the indoor stale air to the outside.

[0094] In some embodiments, the compressor 16 is connected with four heat exchangers through a four-way valve 17 to form a refrigerant circulation flow path.

[0095] In some embodiments, the control module is configured to control the communication state between the four connection ports of the reversing devices (the second reversing device 15 and the first reversing device 14) and / or the flow direction of the refrigerant in the refrigerant circulation flow path, so as to be consistent with the current operation mode of the air conditioning device.

[0096] The first adsorption member 12 and the second adsorption member 13 have a certain water adsorption capacity, and can lock the adsorbed water, and can also release the locked water as water vapor at high temperature.

[0097] In some embodiments, when the heat exchanger in the heat exchange cavity connected with the fresh air channel is an evaporator, the fresh air can be cooled and dehumidified, and at the same time, the indoor return air passes through the heat exchange cavity where the condenser is located, so as to heat and warm the indoor return air. When the indoor return air passes through the adsorption member in the heat exchange cavity, the water in the adsorption member can be dried and released with the airflow to the outdoor, so as to achieve the purpose of drying and regenerating the adsorption member.

[0098] When the heat exchanger in the heat exchange cavity connected with the fresh air channel is a condenser, the fresh air passes through the condenser and the temperature is increased, and then passes through the adsorption member in the heat exchange cavity, so as to dry and release the water in the adsorption member with the airflow into the indoor, so as to achieve the effect of humidifying the fresh air. At the same time, the indoor return air passes through the heat exchange cavity where the evaporator is located, so as to cool the indoor return air. The water in the air is condensed and adsorbed by the adsorption member in the heat exchange cavity, so as to achieve the purpose of humidifying and regenerating the adsorption member.

[0099] In some embodiments, by arranging a heat exchanger upstream and downstream of the first adsorption member 12 and the second adsorption member 13, the airflow passing through the downstream heat exchanger can be cooled again after passing through the first adsorption member 12 or the second adsorption member 13, so as to effectively solve the technical problem that the supply air temperature is high due to the release of latent heat of vaporization when the adsorption material adsorbs water, and finally realize the double regulation of the humidity and temperature of the fresh air.

[0100] In some embodiments, the air conditioning device can also suppress the problem of excessive exhaust pressure by optimizing the air volume control, and suppress the problem of reversing noise by optimizing the compressor frequency control.

[0101] In some embodiments, as shown in FIG. 1, the air conditioning device comprises a compressor 16, a condenser 11, an evaporator 21, an expansion valve 22, a control module 23, a fresh air channel 24, a return air channel 25, a first adsorption member 12, a second adsorption member 13, a first reversing device 14, and a second reversing device 15. Figure 2As shown, the air conditioning device further comprises a first humidity detection module 18, a first temperature and humidity detection module 19, a second humidity detection module 20, and a second temperature and humidity detection module 21. The first humidity detection module 19 is arranged in the first heat exchange cavity 111 and upstream of the first suction accessory 12 in the airflow direction, and is configured to detect the humidity of the fresh air before passing through the first suction accessory 12.

[0102] The first temperature and humidity detection module 19 is arranged in the first heat exchange cavity 111 and downstream of the first suction accessory 12 in the airflow direction, and is configured to detect the temperature and humidity of the fresh air after passing through the first suction accessory 12.

[0103] The second humidity detection module 20 is arranged in the second heat exchange cavity 112 and upstream of the second suction accessory 13 in the airflow direction, and is configured to detect the humidity of the fresh air before passing through the second suction accessory 13.

[0104] The second temperature and humidity detection module 21 is arranged in the second heat exchange cavity 112 and downstream of the second suction accessory 13 in the airflow direction, and is configured to detect the temperature and humidity of the fresh air after passing through the second suction accessory 13.

[0105] The control module controls the operation state of the compressor 16 and the flow direction of the four-way valve 17 according to the temperature upstream and the temperature and humidity downstream of the suction accessory, and can also control the connection state of the two heat exchangers in the heat exchange cavity.

[0106] In some embodiments, the two heat exchangers located on both sides of the first suction accessory 12 are a first heat exchanger 22 and a second heat exchanger 23. The first heat exchanger 22 is arranged in the first heat exchange cavity 111 and upstream of the first suction accessory 12 in the airflow direction.

[0107] The second heat exchanger 23 is arranged in the first heat exchange cavity 111 and downstream of the first suction accessory 12 in the airflow direction.

[0108] In some embodiments, the two heat exchangers located on both sides of the second suction accessory 13 are a third heat exchanger 24 and a fourth heat exchanger 25. The third heat exchanger 23 is arranged in the second heat exchange cavity 112 and upstream of the second suction accessory 13 in the airflow direction.

[0109] The fourth heat exchanger 25 is arranged in the second heat exchange cavity 112 and downstream of the second suction accessory 13 in the airflow direction.

[0110] In some embodiments, the two heat exchangers located in the same heat exchange cavity can be connected in series through a connecting pipe, so that the heat exchange modes of the two heat exchangers in the refrigerant circulation flow path are consistent, and the airflows upstream and downstream of the suction accessory can be exchanged, respectively.

[0111] Port D of the four-way valve 17 is connected with the exhaust port 161 of the compressor 16, and port S of the four-way valve is connected with the suction port 162 of the compressor 16.

[0112] In order to improve the flexibility of the refrigerant system control, the control can be suitable for different working conditions, and whether the heat exchanger located downstream of the suction accessory is connected to the refrigerant circulation system is selected according to actual needs, and in some embodiments of the present application, as shown in the figure, the air conditioning device further comprises a first electric three-way valve 26, which is used to control the first heat exchanger 22 and the second heat exchanger 23 to be connected in series in the refrigerant circulation loop, or only the first heat exchanger 22 is connected in the refrigerant circulation loop. Figure 2 When the first heat exchanger 22 and the second heat exchanger 23 are both connected in the refrigerant circulation loop, the air upstream and downstream of the first suction accessory 12 can be respectively heat-exchanged, avoiding the case that the temperature fluctuates greatly after the air passes through the first suction accessory 12.

[0113] When the actual working condition is that the suction accessory will not cause a large temperature change, the first electric three-way valve 26 can be controlled to be connected or disconnected, and only the first heat exchanger 22 is connected in the refrigerant circulation loop.

[0114] In some embodiments, the three ports of the first electric three-way valve 26 are respectively connected with port C of the four-way valve 17, the first port 221 of the first heat exchanger, and the second port 232 of the second heat exchanger.

[0115] Port C of the four-way valve 17 is also connected with the first port 231 of the second heat exchanger, and the first electric three-way valve 26 is controlled by the control module to communicate the first port 221 of the first heat exchanger with the second port 232 of the second heat exchanger, or to communicate the first port 221 of the first heat exchanger with port C of the four-way valve.

[0116] When the first port 221 of the first heat exchanger is communicated with the second port 232 of the second heat exchanger, the first heat exchanger 22 and the second heat exchanger 23 are connected in series in the refrigerant circulation loop.

[0117] When the first port 221 of the first heat exchanger is communicated with port C of the four-way valve, the second port 232 of the second heat exchanger is blocked, so that the second heat exchanger 23 is no longer connected in the refrigerant circulation loop, and only the first heat exchanger 22 is connected in the refrigerant circulation loop.

[0118] In some embodiments, the second port 222 of the first heat exchanger is connected with the first port 241 of the third heat exchanger through the electronic expansion valve 30.

[0119] In some embodiments, a second electric three-way valve 27 is further included, and the three ports of the second electric three-way valve 27 are respectively connected with port E of the four-way valve 17, the second port 242 of the third heat exchanger, and the first port 251 of the fourth heat exchanger.

[0120] Port E of the four-way valve is also connected with the second port 252 of the fourth heat exchanger. The second electric four-way valve 27 is controlled by the control module to connect the second port 242 of the third heat exchanger with the first port 251 of the fourth heat exchanger, or to connect the second port 242 of the third heat exchanger with port E of the four-way valve.

[0121] When the second port 242 of the third heat exchanger is connected with the first port 251 of the fourth heat exchanger, the third heat exchanger 24 and the fourth heat exchanger 25 are connected in series in the refrigerant circulation loop.

[0122] When the second port 242 of the third heat exchanger is connected with port E of the four-way valve, the second port 252 of the fourth heat exchanger is blocked, so that the fourth heat exchanger 25 is no longer connected in the refrigerant circulation loop, and only the third heat exchanger 24 is connected in the refrigerant circulation loop.

[0123] In some embodiments, the adjustment mode of the air conditioning device includes a dehumidification mode and a humidification mode. When the adjustment mode is the dehumidification mode, the control module is configured to:

[0124] start the compressor 16, control the flow direction of the refrigerant through the four-way valve 17, and control the second reversing device 15 and the first reversing device 14 to act, so that one of the first heat exchanger 22 and the third heat exchanger 24 acts as a condenser, and the other acts as an evaporator, and the outdoor air inlet OA and the indoor air supply outlet SA are connected with the heat exchange cavities where the evaporators are located, and the indoor air return outlet RA and the outdoor air exhaust outlet EA are connected with the heat exchange cavities where the condensers are located.

[0125] When the adjustment mode is the humidification mode, the control module is configured to:

[0126] start the compressor 16, control the flow direction of the refrigerant through the four-way valve 17, and control the second reversing device 15 and the first reversing device 14 to act, so that one of the first heat exchanger 22 and the third heat exchanger 24 acts as a condenser, and the other acts as an evaporator, and the outdoor air inlet OA and the indoor air supply outlet SA are connected with the heat exchange cavities where the evaporators are located, and the indoor air return outlet RA and the outdoor air exhaust outlet EA are connected with the heat exchange cavities where the condensers are located.

[0127] In some embodiments, the dehumidification mode includes a single dehumidification mode and a dehumidification and refrigeration dual adjustment mode, and the humidification mode includes a single humidification mode and a humidification and heating dual adjustment mode. When the adjustment mode is the single dehumidification mode or the single humidification mode, the control module is configured to:

[0128] The first electric three-way valve 26 is controlled to connect the first port 221 of the first heat exchanger with the port C of the four-way valve, and the second electric three-way valve 27 is controlled to connect the second port 242 of the third heat exchanger with the port E of the four-way valve, that is, only the first heat exchanger 22 and the third heat exchanger 24 are connected into the refrigerant circulation loop.

[0129] When the adjustment mode is the dehumidification and refrigeration dual adjustment mode or the humidification and heating dual adjustment mode, the control module is configured to:

[0130] The first electric three-way valve 26 is controlled to connect the first port 221 of the first heat exchanger with the second port 232 of the second heat exchanger, and the second electric three-way valve 27 is controlled to connect the second port 242 of the third heat exchanger with the first port 251 of the fourth heat exchanger, that is, the first heat exchanger 22, the second heat exchanger 23, the third heat exchanger 24 and the fourth heat exchanger 25 are all connected into the refrigerant circulation loop in series.

[0131] In some embodiments of the present application, the determination method of the two modes of the dehumidification mode comprises:

[0132] The humidity coefficient a is obtained, and when the humidity coefficient a is greater than a lower limit value, the single dehumidification mode is entered, otherwise, the dehumidification and refrigeration dual adjustment mode is entered;

[0133] The humidity coefficient a is obtained by:

[0134]

[0135] Wherein, doa,aver is the average humidity content of the summer in the area where the air conditioning device is located;

[0136] din is the humidity content of the current indoor air;

[0137] doa is the humidity content of the outdoor air.

[0138] It can be understood that in order to obtain the above-mentioned temperature and humidity, corresponding temperature and humidity detection elements are arranged for direct detection, or they can also be derived and calculated according to other associated detectable parameters.

[0139] The determination method of the two modes of the humidification mode comprises:

[0140] The indoor air supply temperature Tsa is obtained;

[0141] When the indoor air supply temperature Tsa is not less than a set upper limit value, the single humidification mode is entered, otherwise, the humidification and heating dual adjustment mode is entered.

[0142] In some embodiments, the dehumidification and refrigeration dual adjustment mode comprises temperature control priority logic and humidity control priority logic.

[0143] The temperature control priority logic comprises:

[0144] The compressor 16 is started at a high frequency, and after running for a set time, the indoor air supply temperature Tsa is determined. It is determined whether the indoor air supply temperature Tsa meets the set temperature value. If not, the compressor 16 is controlled to reduce the frequency until the indoor air supply temperature Tsa meets the set temperature value.

[0145] It is determined whether the humidity in the heat exchange cavity connected to the indoor air supply port meets the set humidity value. If not, the compressor is controlled to increase the frequency, otherwise, the current running state is maintained.

[0146] The humidity control priority logic comprises:

[0147] The compressor 16 is started at a high frequency, and after running for a set time, the indoor air supply humidity dsa is determined. It is determined whether the indoor air supply humidity dsa meets the first set humidity value. If not, the compressor is controlled to increase the frequency, for example, by a step of 2Hz, until the first set humidity value is met.

[0148] It is determined whether the indoor air supply temperature Tsa meets the second set temperature value. If not, the compressor is controlled to increase the frequency, for example, by a step of 1Hz; if yes, the current state is maintained.

[0149] In this embodiment, the high frequency start of the compressor 16 means that the compressor 16 is started at a relatively high value compared to the conventional start frequency, which is not the maximum operating frequency of the compressor 16. It can be but is not limited to a frequency greater than 60hz.

[0150] In some embodiments, the control module is further configured to:

[0151] The humidity of the first adsorption member 12 or the humidity of the second adsorption member 13 is obtained, and when the humidity meets the set limit value, the second switching device 15 and the first switching device 14 are controlled to switch the heat exchange cavities through which the air supply and the exhaust air flow, and the four-way valve 17 is controlled to switch the flow direction of the refrigerant.

[0152] After the switching of the heat exchange cavities through which the air supply and the exhaust air flow, the condenser and the evaporator are correspondingly switched, so that the air supply always passes through the evaporator and the exhaust air always passes through the condenser in the dehumidification mode, and the air supply always passes through the condenser and the exhaust air always passes through the evaporator in the humidification mode.

[0153] In the dehumidification mode, the adsorption member in the heat exchange cavity originally connected to the air supply adsorbs sufficient moisture, and the dehumidification capacity decreases. After the switching of the heat exchange cavities through which the air supply and the exhaust air flow, the heat exchanger in the heat exchange cavity originally connected to the air supply becomes a condenser, the exhaust air is heated by passing through the condenser, and then the moisture in the adsorption member is evaporated and discharged to the outdoor with the airflow when passing through the adsorption member, realizing the regeneration of the dehumidification capacity of the adsorption member.

[0154] In the humidification mode, the regeneration process of the suction accessories is opposite to that in the dehumidification mode, and the suction accessories in the heat exchange cavity originally connected with the air supply achieve the regeneration of the humidification capacity after the reversing.

[0155] In some embodiments, before controlling the second reversing device 15 and the first reversing device 14 to reverse, further comprising:

[0156] The operating frequency of the compressor 16 is unchanged, the opening of the electronic expansion valve 30 is adjusted to V2, and then the opening of the electronic expansion valve 30 is reduced to V1 after the second reversing device 15 and the first reversing device 14 reverse, and the setting time is continued; wherein V2>V1, by increasing the opening to V1 first, the high-low pressure difference of the four-way valve to the front is reduced, thereby reducing the noise during reversing. After reversing, the opening is reduced to V1 again in order to quickly establish the high-low pressure to meet the requirements of the system.

[0157] Or,

[0158] The opening of the electronic expansion valve is unchanged, the frequency of the compressor is adjusted to reduce to F1, and then the frequency of the compressor is raised to F2 after the second reversing device and the first reversing device reverse, and the setting time is continued. Wherein F1F2, by reducing the frequency of the compressor first, the high-low pressure difference of the four-way valve to the front can still be reduced, thereby reducing the noise problem during reversing.

[0159] In some embodiments, a first filter screen 31 is arranged at the outdoor air inlet OA, and a second filter screen 32 is arranged at the indoor return air inlet RA, for filtering dust in the air flow.

[0160] In some embodiments, an air supply fan 28 is arranged close to the indoor air supply outlet SA, and an exhaust fan 29 is arranged close to the outdoor exhaust outlet EA.

[0161] Embodiment two

[0162] The embodiment provides a specific implementation.

[0163] 1.1 Dehumidification in summer

[0164] State 1:

[0165] As shown in Figure 3 The second reversing device 15 is controlled to connect the outdoor exhaust outlet EA with the first heat exchange cavity 111, and connect the indoor air supply outlet SA with the second heat exchange cavity 112. The first reversing device 14 is controlled to connect the outdoor air inlet OA with the second heat exchange cavity 112, and connect the indoor return air inlet RA with the first heat exchange cavity 111. At this time, the outdoor air inlet OA, the second heat exchange cavity 112, and the indoor air supply outlet SA form a fresh air channel. The indoor return air inlet RA, the first heat exchange cavity 111, and the outdoor exhaust outlet EA form a return air channel.

[0166] At this time, the third heat exchanger 24 works as an evaporator, and the first heat exchanger 22 works as a condenser.

[0167] Fresh air side: outdoor fresh air enters the unit from the OA port, is purified by the first filter screen 31 first, reaches the first switching device 14, and enters the second heat exchange cavity 112, and passes through the third heat exchanger 24, which works as an evaporator at this time. After the fresh air passes through the third heat exchanger 24, the temperature and the humidity of the fresh air are both reduced, and the relative humidity is increased. Then, the fresh air reaches the second adsorption accessory 13. At this time, the fresh air has a low temperature and a high relative humidity. When the fresh air passes through the adsorption material, the water carried by the fresh air is adsorbed in the material. Therefore, the humidity of the fresh air is further reduced after passing through the second adsorption accessory 13. Then, the fresh air passes through the fourth heat exchanger 25, the opening of which is determined by the corresponding judgment logic. If the fourth heat exchanger 25 is opened, the temperature of the fresh air is further reduced, and the humidity of the fresh air may be reduced or unchanged. Then, the fresh air reaches the second switching device 15, and is finally sent into the indoor by the indoor air supply port SA under the suction of the air supply fan 28.

[0168] Exhaust air side: exhaust air (indoor air) enters from the RA port, is purified by the second filter screen 32 on the return air side first, then enters the first heat exchange cavity 111 by the first switching device 14, and then passes through the first heat exchanger 22, which works as a condenser at this time. After the exhaust air passes through the first heat exchanger 22, the temperature of the exhaust air is increased, and the relative humidity is reduced. Then, the exhaust air reaches the first adsorption accessory 12. At this time, the exhaust air has a high temperature and a low relative humidity. When the exhaust air passes through the adsorption material, the water in the adsorption material is brought out. Therefore, the humidity of the exhaust air is increased, and the temperature of the exhaust air is reduced after passing through the first adsorption accessory 12. Then, the exhaust air passes through the second heat exchanger 23, the opening of which is determined by the corresponding judgment logic. If the second heat exchanger 23 is opened, the temperature of the exhaust air is further increased, and the humidity of the exhaust air is unchanged. Then, the exhaust air reaches the second switching device 15, and is finally discharged to the outdoor by the outdoor exhaust port EA under the suction of the exhaust fan 29.

[0169] Refrigerant switching: when it is detected that the second adsorption accessory 13 is saturated, the unit sends a switching instruction. The second switching device 15 and the first switching device 14 are both actuated, and the four-way valve 17 is also switched. State 2 is entered.

[0170] State 2:

[0171] For example, Figure 4As shown, the fresh air side: outdoor fresh air enters the unit from the OA port, first passes through the first filter screen 31 for purification, reaches the first reversing device 14, enters the first heat exchange cavity 111, passes through the first heat exchanger 22, at this time the first heat exchanger 22 functions as an evaporator, and the temperature and humidity of the fresh air are reduced after passing through the first heat exchanger 22, and the relative humidity is increased, then reaches the first adsorption accessory 12, at this time the fresh air with low temperature and high relative humidity, when passing through the adsorption material, the water carried by the fresh air is adsorbed inside the material, so that the humidity of the fresh air is further reduced after passing through the first adsorption accessory 12; then passes through the second heat exchanger 23, the opening of the second heat exchanger 23 is determined by the corresponding judgment logic. If the second heat exchanger 23 is opened, the temperature of the fresh air is further reduced, and the humidity may be reduced or unchanged, then reaches the second reversing device 15, and finally is sent into the indoor by the indoor air outlet SA port under the suction of the air supply fan 28.

[0172] The exhaust air side: exhaust air (indoor air) enters from the RA port, first passes through the second filter screen 32 for purification, then passes through the first reversing device 14 to enter the second heat exchange cavity 112, and the exhaust air passes through the third heat exchanger 24, at this time the third heat exchanger 24 functions as a condenser, and the temperature of the exhaust air is increased after passing through the third heat exchanger 24, and the relative humidity is reduced, then reaches the second adsorption accessory 13, at this time the exhaust air with high temperature and low relative humidity, when passing through the adsorption material, carries out the water in the adsorption material, so that the humidity of the exhaust air is increased and the temperature is reduced after passing through the second adsorption accessory 13; then passes through the fourth heat exchanger 25, the opening of the fourth heat exchanger 25 is determined by the corresponding judgment logic. If the fourth heat exchanger 25 is opened, the temperature of the exhaust air is further increased, and the humidity is unchanged, then reaches the second reversing device 15, and finally is discharged to the outdoor by the outdoor exhaust port EA under the suction of the exhaust fan 29.

[0173] Refrigeration working condition system cycle:

[0174] In some embodiments, when the adjustment mode of the air conditioning device is a single dehumidification mode, the compressor 16 is opened, and the flow direction of the refrigerant is controlled by the four-way valve 17. For the second heat exchange cavity 112 of state 1 connected to the fresh air channel, the third heat exchanger 24 functions as an evaporator, and the first heat exchanger 22 functions as a condenser. The first electric three-way valve 26 is controlled to communicate the first port 221 of the first heat exchanger with the port C of the four-way valve, and the second electric three-way valve 27 is controlled to communicate the second port 242 of the third heat exchanger with the port E of the four-way valve, and the four-way valve 17 is controlled to communicate the port D of the four-way valve with the port C thereof, and the port S of the four-way valve 17 with the port E thereof. At this time, the flow direction of the refrigerant is as follows:

[0175] Compressor's discharge port 161→four-way valve 17's port D→four-way valve 17's port C→first heat exchanger 22(as condenser)→electronic expansion valve 30→third heat exchanger 24(as evaporator)→four-way valve's port E→four-way valve 17's port S→compressor's suction port 162.

[0176] For the first heat exchange cavity 111 of state 2 constituting fresh air channel, the first heat exchanger 22 as evaporator, the third heat exchanger 24 as condenser. Control the first electric three-way valve 26 to communicate the first port 221 of the first heat exchanger with the port C of the four-way valve, and control the second electric three-way valve 27 to communicate the second port 242 of the third heat exchanger with the port E of the four-way valve, and control the four-way valve 17 to communicate the port D of the four-way valve 17 with the port E of the four-way valve 17, and the port S of the four-way valve 17 with the port C of the four-way valve 17. At this time, the flow direction of refrigerant is:

[0177] Compressor's discharge port 161→four-way valve 17's port D→four-way valve's port E→third heat exchanger 24(as condenser)→electronic expansion valve 30→first heat exchanger 22(as evaporator)→four-way valve's port C→four-way valve 17's port S→compressor's suction port 162.

[0178] In some embodiments, when the air conditioning device is in the dehumidification and refrigeration dual regulation mode, the compressor 16 is started, and the flow direction of refrigerant is controlled by the four-way valve 17. For the second heat exchange cavity 112 of state 1 constituting fresh air channel, the third heat exchanger 24 and the fourth heat exchanger 25 as evaporator, the first heat exchanger 22 and the second heat exchanger 23 as condenser. Control the first electric three-way valve 26 to communicate the first port 221 of the first heat exchanger with the second port 232 of the second heat exchanger, and control the second electric three-way valve 27 to communicate the second port 242 of the third heat exchanger with the first port 251 of the fourth heat exchanger. At the same time, control the four-way valve 17 to communicate the port D of the four-way valve 17 with the port C of the four-way valve 17, and the port S of the four-way valve 17 with the port E of the four-way valve 17. At this time, the flow direction of refrigerant is:

[0179] Compressor's discharge port 161→four-way valve 17's port D→four-way valve 17's port C→second heat exchanger 23(as condenser)→first heat exchanger 22(as condenser)→electronic expansion valve 30→third heat exchanger 24(as evaporator)→fourth heat exchanger 25(as evaporator)→four-way valve's port E→four-way valve 17's port S→compressor's suction port 162.

[0180] The high-temperature and high-pressure gaseous refrigerant from the compressor 16 in the above state first reaches the four-way valve 17, then reaches the second heat exchanger 23, exchanges heat with the air outside the tube in the second heat exchanger 23, releases heat to the air, becomes low-temperature and high-pressure gaseous-liquid two-phase refrigerant, then reaches the first electric three-way valve 26, flows to the first heat exchanger 22 through the first electric three-way valve 26, continues to exchange heat with the air outside the tube in the first heat exchanger 22, releases heat to the air, becomes high-pressure gaseous-liquid or liquid two-phase refrigerant with a lower temperature, then flows to the electronic expansion valve 30, becomes low-temperature and low-pressure liquid refrigerant through the throttling pressure reduction of the electronic expansion valve 30, then reaches the third heat exchanger 24, exchanges heat with the air outside the tube in the third heat exchanger 24, absorbs the heat of the air, becomes low-temperature and high-pressure gaseous refrigerant, then reaches the second electric three-way valve 27, flows to the fourth heat exchanger 25, exchanges heat with the air outside the tube in the fourth heat exchanger 25, absorbs the heat of the air, becomes low-temperature and high-pressure gaseous refrigerant, then flows back to the four-way valve 17, and finally returns to the compressor, completing a refrigeration cycle.

[0181] For the first heat exchange cavity 111 of the fresh air channel in state 2, the first heat exchanger 22 and the second heat exchanger 23 serve as evaporators, and the third heat exchanger 24 and the fourth heat exchanger 25 serve as condensers. The first electric three-way valve 26 is controlled to communicate the first port 221 of the first heat exchanger with the second port 232 of the second heat exchanger, the second electric three-way valve 27 is controlled to communicate the second port 242 of the third heat exchanger with the first port 251 of the fourth heat exchanger, and the four-way valve 17 is controlled to communicate the port D of the four-way valve 17 with the port E of the four-way valve 17 and the port S of the four-way valve 17 with the port C of the four-way valve 17. At this time, the flow direction of the refrigerant is as follows:

[0182] The exhaust port 161 of the compressor → the port D of the four-way valve 17 → the port E of the four-way valve → the fourth heat exchanger 25 (serving as a condenser) → the third heat exchanger 24 (serving as a condenser) → the electronic expansion valve 30 → the first heat exchanger 22 (serving as an evaporator) → the second heat exchanger 23 (serving as an evaporator) → the port C of the four-way valve → the port S of the four-way valve → the suction port 162 of the compressor.

[0183] The high-temperature and high-pressure gaseous refrigerant from the compressor 16 in the above state first reaches the four-way valve 17, then reaches the fourth heat exchanger 25, exchanges heat with the air outside the tube in the fourth heat exchanger 25, releases heat to the air, becomes low-temperature and high-pressure gaseous-liquid two-phase refrigerant, then flows to the second electric three-way valve 27, and then flows to the third heat exchanger 24, continues to exchange heat with the air outside the tube in the third heat exchanger 24, releases heat to the air, becomes high-pressure gaseous-liquid or liquid two-phase refrigerant with a lower temperature, then flows to the electronic expansion valve 30, is throttled and decompressed by the electronic expansion valve 30 to become low-temperature and low-pressure liquid refrigerant, then reaches the inlet of the first heat exchanger 22, exchanges heat with the air outside the tube in the first heat exchanger 22, absorbs the heat of the air, becomes low-temperature and high-pressure gaseous refrigerant, then reaches the first electric three-way valve 26 again, flows to the second heat exchanger 23, exchanges heat with the air outside the tube in the second heat exchanger 23, absorbs the heat of the air, becomes low-temperature and high-pressure gaseous refrigerant, then flows back to the four-way valve 17, and finally returns to the compressor, completing a refrigeration cycle.

[0184] The determination method of the two modes of the dehumidification mode includes:

[0185] Step 1: summer start.

[0186] Step 2: determine the dehumidification operation mode.

[0187] Determine whether a is greater than or equal to 1.8, if yes, enter the single dehumidification mode.

[0188] If not, it means that the humidity is not at a high level in the whole year, and the dehumidification and refrigeration dual regulation mode is entered.

[0189]

[0190] doa, aver--average humidity content of the area where the unit is located in summer, unit: g / kg DA.

[0191] din--humidity content of the current indoor air, unit: g / kg DA.

[0192] doa--humidity content of the outdoor air, unit: g / kg DA.

[0193] The humidity coefficient a is used to determine the humidity of the current outdoor fresh air.

[0194] The purpose of the single dehumidification mode is to only process the humidity to the target range, and in some embodiments, as shown in FIG. 6, the specific control method of the single dehumidification mode includes: Figure 7

[0195] Step 1: determine the difference between the current fresh air humidity doa and the set humidity dset.

[0196] ​If doa-dset<1, then judge whether |Toa-Tset| is ≤2;

[0197] If doa-dset≥1, then the compressor is not started, and only the air supply fan and the exhaust fan are started;

[0198] If doa-dset<1, then the compressor is started at the lowest frequency, and the refrigeration / heating mode is automatically judged according to the size of Toa-Tset;

[0199] If doa-dset<1, then go to the second step;

[0200] Second step: judge the difference Δd1 between the current fresh air humidity doa and the set humidity dset in which interval;

[0201] If Δd1=doa-dset≥10, then the compressor startup frequency is 40Hz;

[0202] If 5≤Δd1=doa-dset<10, then the compressor startup frequency is 30Hz;

[0203] If 0≤Δd1=doa-dset≤5, then the compressor startup frequency is 20Hz;

[0204] When the humidity is large, the startup frequency is high, so as to quickly reach the target value;

[0205] When the humidity is not large, the startup frequency is low, so as to save energy;

[0206] Fourth step: judge the difference Δd2 between d4 or d3 and the set humidity dset, i.e., Δd2=d4-dset and Δd2=d3-dset;

[0207] Whether d4-dset≤-1 and d3-dset≤-1 are satisfied;

[0208] If yes, it means that the humidity target here is reached, so the compressor is appropriately reduced in frequency to save energy;

[0209] If no, then the compressor is increased in frequency so as to quickly reach the target;

[0210] Fifth step: after the humidity target is satisfied, judge every N1 minutes whether Δd2>0;

[0211] If yes, it means that the supply air humidity has been higher than the set humidity, so the compressor is increased in frequency; then judge every N2 minutes again to return to the fourth step; if no, then the current state is maintained;

[0212] The purpose of the control method is to start the compressor at a suitable frequency and to detect the supply air humidity and the set target humidity in real time, so as to dehumidify according to actual requirements, prevent excessive dehumidification, ensure stable supply air humidity, and not increase the indoor humidity load.

[0213] The dehumidification and refrigeration dual regulation mode, i.e., both temperature and humidity need to reach the target value range, as shown in the table, the dehumidification and refrigeration dual regulation mode includes: Figure 8

[0214] Step 1: start in summer;

[0215] Step 2: determine the relationship between the fresh air temperature and humidity and the set temperature and humidity;

[0216]

[0217] doa--the humidity content of outdoor fresh air, unit g / kg DA;

[0218] dset--the set target humidity content of indoor, unit g / kg DA;

[0219] Toa--the temperature of outdoor air, unit ℃;

[0220] Tset--the set target temperature of indoor, unit ℃;

[0221] The value represents the judgment of the current indoor and outdoor temperature difference and humidity difference, to determine which parameter is given priority;

[0222] If β≥1, the temperature is given priority;

[0223] If β<1, the humidity is given priority.

[0224] The dehumidification and refrigeration dual regulation mode includes temperature control priority logic and humidity control priority logic.

[0225] The temperature control priority logic includes:

[0226] Control the first electric three-way valve 26 and the second electric three-way valve 27, at this time, the first heat exchanger 22 and the second heat exchanger 23 are connected in series, and the third heat exchanger 24 and the fourth heat exchanger 25 are connected in series;

[0227] Step 1: start the compressor at high frequency, and determine whether the supply air temperature meets Tsa≤Tset-1 after a set time;

[0228] If not, increase the frequency of the compressor until Tsa≤Tset-1 is met;

[0229] ​Second step: judge whether the difference between d4 or d3 and the set humidity dset is Δd2, i.e. Δd2 = d4 - dset and Δd2 = d3 - dset;

[0230] whether d4 ≤ dset - 0.5 and d3 ≤ dset - 0.5 are satisfied;

[0231] If yes, it means that the humidity target at this point is achieved, and the compressor keeps the current state running;

[0232] If no, the compressor is increased in frequency so as to quickly reach the target;

[0233] Third step: judge whether d4 or d3 is ≤ dset - 2;

[0234] If no, the current state is maintained; if yes, it means that the dehumidification amount is excessive, and the compressor frequency is reduced at this time;

[0235] Fourth step: judge whether the difference between d4 or d3 and the set humidity dset is Δd2, i.e. whether -2 < Δd2 < -0.5 is satisfied;

[0236] If yes, the compressor maintains the current state; if no, the compressor is again reduced in frequency until the above condition is satisfied.

[0237] The humidity control priority logic comprises:

[0238] The first electric three-way valve 26 and the second electric three-way valve 27 are controlled, and at this time, the first heat exchanger 22 and the second heat exchanger 23 are connected in series, and the third heat exchanger 24 and the fourth heat exchanger 25 are connected in series;

[0239] First step: the compressor is started at a high frequency, and after a set time, it is judged whether the supply air temperature satisfies dsa ≤ dset - 1;

[0240] If no, the compressor is increased in frequency by 2 Hz until dsa ≤ dset - 1 is satisfied;

[0241] Second step: it is further judged whether the supply air temperature satisfies Tsa ≤ Tset + 2 (here, the requirement for the supply air temperature is appropriately reduced for energy saving);

[0242] If no, the compressor is increased in frequency by 1 Hz;

[0243] If yes, the current state is maintained.

[0244] The purpose of the control method is:

[0245] i.e. the temperature target can be satisfied, the humidity target can be satisfied, and whether excessive dehumidification is considered, the humidity priority control is considered, and the temperature control is relaxed for energy saving.

[0246] To ensure the comfort of indoor air supply, before and after the transition season, when the fresh air humidity load and sensible heat load are not large, as shown in Figure 9 It also includes an automatic air supply control mode:

[0247] Step 1: Determine whether 15≤Toa≤27 and Toa-Tin≤5℃ are met.

[0248] If met, enter automatic air supply control, and the air supply fan and exhaust fan are turned on.

[0249] If not met, enter other modes.

[0250] Step 2: Determine whether Toa-Tin≤3℃ is met.

[0251] If met, the compressor is not started. Then determine whether doa-din≤2 is met. If met, the compressor is still not started. If not met, the compressor is started at a small frequency, and then returns to determine every certain period of time.

[0252] If not met, the compressor is started at a small frequency, and then returns to determine every certain period of time.

[0253] 1.2 Winter humidification

[0254] State 1:

[0255] As shown in Figure 5 The second reversing device 15 is controlled to communicate the outdoor exhaust port EA with the first heat exchange cavity 111, and the indoor air supply port SA with the second heat exchange cavity 112. The first reversing device 14 is controlled to communicate the outdoor air inlet port OA with the second heat exchange cavity 112, and the indoor return air port RA with the first heat exchange cavity 111. At this time, the outdoor air inlet port OA, the second heat exchange cavity 112, and the indoor air supply port SA form a fresh air channel. The indoor return air port RA, the first heat exchange cavity 111, and the outdoor exhaust port EA form a return air channel.

[0256] At this time, the third heat exchanger 24 works as a condenser, and the first heat exchanger 22 works as an evaporator.

[0257] Fresh air side: outdoor fresh air enters the unit from OA, first passes through the first filter screen 31 for purification, reaches the first reversing device 14, and enters the second heat exchange cavity 112, passes through the third heat exchanger 24, which at this time functions as a condenser, and the temperature of the fresh air rises and the relative humidity decreases after passing through the third heat exchanger 24. The fresh air then reaches the second adsorption accessory 13, at which time the fresh air with a high temperature and low relative humidity causes the water in the adsorption material to be brought out, so that the humidity of the fresh air increases and the temperature decreases after passing through the second adsorption accessory 13. The fresh air then passes through the fourth heat exchanger 25, the opening of which is determined by the control method. If the fourth heat exchanger 25 is open, the temperature of the fresh air rises again and the humidity remains unchanged. The fresh air then reaches the second reversing device 15 and is finally sent into the room through the indoor air outlet SA under the suction of the air supply fan 28.

[0258] Exhaust air side: exhaust air (indoor air) enters the unit from RA, first passes through the second filter screen 32 for purification, then passes through the first reversing device 14 and enters the first heat exchange cavity 111. The exhaust air then passes through the first heat exchanger 22, which at this time functions as an evaporator, and the temperature of the exhaust air decreases and the relative humidity increases after passing through the first heat exchanger 22. The exhaust air then reaches the first adsorption accessory 12, at which time the air with a low temperature and high relative humidity causes the water in the adsorption material to be retained in the adsorption material, so that the humidity of the exhaust air decreases and the temperature increases after passing through the first adsorption accessory 12. The exhaust air then passes through the second heat exchanger 23, the opening of which is determined by the control method. If the second heat exchanger 23 is open, the temperature of the exhaust air further decreases and the humidity remains unchanged. The exhaust air then reaches the second reversing device 15 and is finally discharged to the outside through the outdoor air outlet EA under the suction of the exhaust air fan 29.

[0259] When it is detected that the second heat exchange member 13 is dry, the unit issues a reversing command, and the first reversing device 14 and the second reversing device 15 are both actuated to realize the reversing of the heat exchange cavities connected by the airflow passages, and the four-way valve 17 is also reversed, entering state 2. The airflow direction in state 2 is shown in FIG. 8. Figure 6

[0260] Heating operation cycle:

[0261] In some embodiments, when the air conditioning device is in the single humidification mode, the compressor 16 is turned on, and the flow direction of the refrigerant is controlled by the four-way valve 17. Taking the second heat exchange cavity 112 in state 1 as an example, the third heat exchanger 24 functions as a condenser and the first heat exchanger 22 functions as an evaporator. The first electric three-way valve 26 is controlled to connect the first port 221 of the first heat exchanger with port C of the four-way valve, and the second electric three-way valve 27 is controlled to connect the second port 242 of the third heat exchanger with port E of the four-way valve. At the same time, the four-way valve 17 is controlled to connect port D of the four-way valve 17 with port E of the four-way valve 17, and port S of the four-way valve 17 with port C of the four-way valve 17. At this time, the flow direction of the refrigerant is:​

[0262] The compressor's discharge port 161 → port D of four-way valve 17 → port E of four-way valve 17 → third heat exchanger 24 (as a condenser) → electronic expansion valve 30 → first heat exchanger 22 (as an evaporator) → port C of four-way valve → port S of four-way valve 17 → compressor's suction port 162.

[0263] In some embodiments, when the air conditioning device is in dehumidification and cooling dual-regulation mode, the compressor 16 is turned on, and the refrigerant flow is controlled by the four-way valve 17. Taking the second heat exchange chamber 112 in state 1 connected to the fresh air duct as an example, the third heat exchanger 24 and the fourth heat exchanger 25 act as condensers, and the first heat exchanger 22 and the second heat exchanger 23 act as evaporators. The first electric three-way valve 26 is controlled to connect the first port 221 of the first heat exchanger with the second port 232 of the second heat exchanger, and the second electric three-way valve 27 is controlled to connect the second port 242 of the third heat exchanger with the first port 251 of the fourth heat exchanger. At the same time, the four-way valve 17 is controlled to switch, connecting port D of the four-way valve 17 with its port E, and connecting port S of the four-way valve 17 with its port C. At this time, the refrigerant flow direction is:

[0264] The compressor's discharge port 161 → port D of four-way valve 17 → port E of four-way valve 17 → fourth heat exchanger 25 (as a condenser) → third heat exchanger 24 (as a condenser) → electronic expansion valve 30 → first heat exchanger 22 (as an evaporator) → second heat exchanger 23 (as an evaporator) → port C of four-way valve → port S of four-way valve 17 → compressor's suction port 162.

[0265] In this state, the high-temperature, high-pressure gaseous refrigerant from compressor 16 first reaches four-way valve 17, then to the fourth heat exchanger 25. In the fourth heat exchanger 25, it exchanges heat with the air outside the pipes, releasing heat to the air and becoming a low-temperature, high-pressure gas-liquid two-phase refrigerant. It then reaches the second electric three-way valve 27 and flows to the third heat exchanger 24. In the third heat exchanger 24, it continues to exchange heat with the air outside the pipes, releasing heat to the air and becoming an even lower-temperature, high-pressure gas-liquid or liquid two-phase refrigerant. Finally, it flows to the electronic expansion valve... The refrigerant passes through valve 30, where it is throttled and depressurized by electronic expansion valve 30, becoming a low-temperature, low-pressure liquid refrigerant. It then reaches the first heat exchanger 22, where it exchanges heat with the air outside the pipe, absorbing heat from the air and becoming a low-temperature, high-pressure gaseous refrigerant. It then reaches the first electric three-way valve 26, and flows to the second heat exchanger 23, where it exchanges heat with the air outside the pipe, absorbing heat from the air and becoming a low-temperature, high-pressure gaseous refrigerant. Finally, it flows back to the four-way valve and back to the compressor, completing one heating cycle.

[0266] like Figure 10 As shown, the method for determining the single humidification mode and the dual dehumidification and cooling mode is as follows:

[0267] First step: judge whether Tsa≥Tset+1 is satisfied.

[0268] If satisfied, the first electric three-way valve 26 and the second electric three-way valve 27 are closed, and the second heat exchanger 23 and the fourth heat exchanger 25 are not connected to the refrigerant circulation loop.

[0269] If not satisfied, the first electric three-way valve 26 and the second electric three-way valve 27 are opened, and the second heat exchanger 23 and the fourth heat exchanger 25 are connected in series to the refrigerant circulation loop.

[0270] Second step: judge whether |dsa-din|≤1 is satisfied. Here, din is used because the humidification principle of the device determines that the humidification effect in winter is mainly related to the indoor humidity. If dsa-dset is used, the compressor frequency may reach the maximum and still not satisfy this condition when the target value of dset is too high.

[0271] If satisfied, the compressor frequency remains unchanged.

[0272] If not satisfied, the compressor frequency is increased, and then the judgment is returned every set time.

[0273] Third step: judge whether Tsa≥Tset+4 is satisfied.

[0274] If satisfied, the compressor frequency is reduced, and then the judgment is returned every set time.

[0275] The control method can ensure that the humidity of the fresh air is close to the humidity of the indoor air, and the supply air temperature is greater than the set indoor temperature.

[0276] By controlling the opening and closing of the first electric three-way valve 26 and the second electric three-way valve 27, the number of heat exchangers in operation is adjusted to ensure that the unit can operate efficiently at both small and large loads.

[0277] 1.3 Low noise and fast adaptation control in reversing process

[0278] In some embodiments, to continuously dehumidify and humidify, the fresh air duct and the exhaust air duct are exchanged according to the specified time; for example, in summer reversing control, the reversing time is determined according to the size of the fresh air humidity; the basic principle is that the greater the humidity, the shorter the reversing time, and a minimum reversing time Tmin is set.

[0279]

[0280]

[0281] Table 1

[0282] During the reversing process, the high and low pressure difference in the refrigeration system can cause the four-way valve to produce significant noise.

[0283] In addition, after the condenser becomes an evaporator, it needs to offset the heat left in the heat exchanger from the previous cycle, so there is a problem of heat offsetting; the same applies when the evaporator becomes a condenser. How to reduce this part of heat loss and make the state of the heat exchanger quickly reach stability after the reversal? In some embodiments, three control methods are proposed to solve the above problems.

[0284] Method 1: Adjustment of electronic expansion valve 30.

[0285] The compressor frequency remains constant, such as Figure 12 As shown, at time t1 before the switching, the valve opening of the electronic expansion valve 30 is increased to V2, and then immediately after the switching, the valve opening is reduced to Vmin and maintained for time period t2. Increasing the valve opening of the electronic expansion valve 30 is to reduce the pressure difference during the switching of the four-way valve, thereby reducing the switching noise. Reducing the valve opening to Vmin is to lower the evaporation temperature and increase the condensation temperature, so that the refrigeration system can quickly adapt to the new operating conditions.

[0286] Taking the first heat exchanger 22 as an example, from condenser to evaporator: before switching, the heat exchanger is a condenser, the inside of the tube is a hot fluid, and the tube wall is also at a high temperature. When switching to the evaporator, the inside of the tube is a cold fluid. The lower the fluid temperature, the faster it can offset the heat of the tube wall. Similarly, the evaporator becomes a condenser.

[0287] Method 2: Adjust the compressor frequency.

[0288] like Figure 13 As shown, the electronic expansion valve 30 remains unchanged. Before the reversal, at time t3, the compressor frequency is reduced to F1. Then, immediately after the reversal, the compressor frequency is increased to Fmax and maintained for time period t4. The compressor frequency is reduced to decrease the pressure difference of the four-way valve reversal, thereby reducing the reversal noise. The compressor frequency is increased to decrease the evaporation temperature and increase the condensation temperature, so that the refrigeration system can quickly adapt to the new operating conditions.

[0289] Method 3: Simultaneous adjustment of the electronic expansion valve and the compressor.

[0290] At time t3 before the reversal, the frequency of compressor 16 is reduced to F1, and the opening of electronic expansion valve 30 is increased to V2; then immediately after the reversal, the frequency of compressor is increased to F2, and the opening of electronic expansion valve 30 is reduced to V1, and this continues for time period t4.

[0291] This method does not require large fluctuations in the compressor 16 and electronic expansion valve 30, but it requires very precise control.

[0292] Example 3

[0293] To solve the problem of high pressure of the system, as shown in Figure 11 comprises:

[0294] First step: summer start operation;

[0295] Second step: detect and determine whether the pressure Pd of the compressor exhaust port satisfies Pd≤3.0Mpa;

[0296] If yes, do not enter the high pressure mixed air mode;

[0297] If no, enter the high pressure mixed air mode;

[0298] Third step: simultaneously reduce the speed of the air supply fan and the exhaust fan to the minimum, and then the air valve motor of the second reversing device 15 corresponding to the exhaust air duct is actuated to mix part of the indoor air supply into the exhaust air flow;

[0299] Fourth step: increase the speed of the exhaust fan by 20%;

[0300] Fifth step: return to the judgment of whether Pd is reduced and satisfies Pd≤3.0Mpa;

[0301] If yes, maintain the current speed of the exhaust fan;

[0302] If no, continue to increase the speed of the exhaust fan by +10%, and each time increase by 10%, until the above condition is satisfied:

[0303] Sixth step: reversing instruction;

[0304] Seventh step: simultaneously reduce the speed of the air supply fan and the exhaust fan to the minimum, and then the air valve motor of the second reversing device 15 corresponding to the exhaust air duct is actuated.

[0305] Then return to the fourth step:

[0306] When the reversing instruction is received again, return to the second step; if the cycle is repeated until the high pressure mixed air mode is exited.

[0307] Since the indoor air supply is low-temperature air, when the pressure Pd of the compressor exhaust port is high, mixing part of the indoor air supply into the exhaust air passage is beneficial to the pressure Pd of the compressor exhaust port.

[0308] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

[0309] The foregoing description has been directed to specific embodiments. It is recognized that variations and modifications of the software applications can be made while remaining within the scope of the present application. Accordingly, it is intended that the present application embrace all such variations and modifications as fall within the scope of the appended claims. To the extent not covered by the claims, no limitation is intended. This summary of the application does not necessarily describe all necessary features of the application. The application can be practiced with more than the described features, and these are implemented in various hardware and / or software components.

Claims

1. An air conditioning device characterized by comprising: The air conditioning device comprises: an outer shell, an outdoor air inlet, an outdoor air outlet, an indoor air outlet and an indoor air inlet are formed on the outer shell, a first heat exchange cavity and a second heat exchange cavity are formed in the outer shell; a first suction member is arranged in the first heat exchange cavity, and a heat exchanger is arranged on both sides of the first suction member; a second suction member is arranged in the second heat exchange cavity, and a heat exchanger is arranged on both sides of the second suction member; a first switching device is used for controlling the communication state of the outdoor air inlet and the indoor air outlet with the two heat exchange cavities; a second switching device is used for controlling the communication state of the outdoor air outlet and the indoor air outlet with the two heat exchange cavities; a compressor is connected with four heat exchangers through a four-way valve to form a refrigerant circulation flow path; a control module is used for controlling the communication state of each switching device and the flow direction of the refrigerant circulation flow path; the heat exchangers arranged on both sides of the first suction member are respectively: a first heat exchanger arranged in the first heat exchange cavity and located upstream of the first suction member in the air flow direction; a second heat exchanger arranged in the first heat exchange cavity and located downstream of the first suction member in the air flow direction; the heat exchangers arranged on both sides of the second suction member are respectively: a third heat exchanger arranged in the second heat exchange cavity and located upstream of the second suction member in the air flow direction; a fourth heat exchanger arranged in the second heat exchange cavity and located downstream of the second suction member in the air flow direction; the port D and the port S of the four-way valve are connected with the exhaust port and the suction port of the compressor one by one, and the air conditioning device further comprises: a first electric three-way valve, three ports of the first electric three-way valve are connected with the port C of the four-way valve, the first port of the first heat exchanger and the second port of the second heat exchanger respectively; the port C of the four-way valve is further connected with the first port of the second heat exchanger, and the first electric three-way valve is controlled by the control module to communicate the first port of the first heat exchanger with the second port of the second heat exchanger or communicate the first port of the first heat exchanger with the port C of the four-way valve; the second port of the first heat exchanger is connected with the first port of the third heat exchanger through an electronic expansion valve; a second electric three-way valve, three ports of the second electric three-way valve are connected with the port E of the four-way valve, the second port of the third heat exchanger and the first port of the fourth heat exchanger respectively; the port E of the four-way valve is further connected with the second port of the fourth heat exchanger, and the second electric three-way valve is controlled by the control module to communicate the second port of the third heat exchanger with the first port of the fourth heat exchanger or communicate the second port of the third heat exchanger with the port E of the four-way valve.

2. The air conditioning apparatus according to claim 1, wherein The air conditioning device further comprises: a first humidity detection module arranged in the first heat exchange cavity and located upstream of the first suction member in the air flow direction; a first temperature and humidity detection module arranged in the first heat exchange cavity and located downstream of the first suction member in the air flow direction; a second humidity detection module arranged in the second heat exchange cavity and located upstream of the second suction member in the air flow direction; A second temperature and humidity detection module is arranged in the second heat exchange cavity and downstream of the second suction member in the airflow direction.

3. The air conditioning apparatus according to claim 1, wherein The adjustment mode of the air conditioning device includes a dehumidification mode and a humidification mode, when the adjustment mode is the dehumidification mode, the control module is configured to: start the compressor, control the flow direction of the refrigerant through the four-way valve, one of the first heat exchanger and the third heat exchanger as a condenser, and the other as an evaporator, and simultaneously control the second reversing device and the first reversing device to act, so that the outdoor air inlet and the indoor air supply outlet are respectively communicated with the heat exchange cavity where the evaporator is located, and the indoor return air outlet and the outdoor air exhaust outlet are respectively communicated with the heat exchange cavity where the condenser is located. When the adjustment mode is the humidification mode, the control module is configured to: start the compressor, control the flow direction of the refrigerant through the four-way valve, one of the first heat exchanger and the third heat exchanger as a condenser, and the other as an evaporator, and simultaneously control the second reversing device and the first reversing device to act, so that the outdoor air inlet and the indoor air supply outlet are respectively communicated with the heat exchange cavity where the condenser is located, and the indoor return air outlet and the outdoor air exhaust outlet are respectively communicated with the heat exchange cavity where the evaporator is located.

4. The air conditioning apparatus according to claim 3, wherein The dehumidification mode includes a single dehumidification mode and a dehumidification and refrigeration dual adjustment mode, and the humidification mode includes a single humidification mode and a humidification and heating dual adjustment mode, when the adjustment mode is the single dehumidification mode or the single humidification mode, the control module is configured to: control the first electric three-way valve to communicate the first port of the first heat exchanger with port C of the four-way valve, and control the second electric three-way valve to communicate the second port of the third heat exchanger with port E of the four-way valve; When the adjustment mode is the dehumidification and refrigeration dual adjustment mode or the humidification and heating dual adjustment mode, the control module is configured to: control the first electric three-way valve to communicate the first port of the first heat exchanger with the second port of the second heat exchanger, and control the second electric three-way valve to communicate the second port of the third heat exchanger with the first port of the fourth heat exchanger.

5. The air conditioning apparatus according to claim 4, wherein The determination method of the two modes of the dehumidification mode includes: obtaining a humidity coefficient α, when the humidity coefficient α is greater than a lower limit value, the single dehumidification mode is entered, otherwise, the dehumidification and refrigeration dual adjustment mode is entered; The method for obtaining the humidity coefficient α is: ； wherein is the average moisture content for the region in which the air conditioning device is located in summer; din is the current indoor air humidity content; doa is the outdoor air humidity content; The determination method of the two modes of the humidification mode includes: obtaining an indoor air supply temperature Tsa; When the indoor air supply temperature Tsa is not less than a set upper limit value, the single humidification mode is entered, otherwise, the humidification and heating dual adjustment mode is entered.

6. The air conditioning apparatus according to claim 4, wherein The dehumidification and refrigeration dual adjustment mode includes temperature control priority logic and humidity control priority logic; The temperature control priority logic includes: the compressor is started at high frequency, and after running for a set time, the indoor air supply temperature Tsa is judged, whether the indoor air supply temperature Tsa meets the set temperature value is judged, if not, the frequency of the compressor is reduced until the indoor air supply temperature Tsa meets the set temperature value; The control module is further configured to: The humidity control priority logic comprises: The compressor is started at a high frequency, and the indoor air supply humidity dsa is determined after the compressor is operated for a set time. The indoor air supply humidity dsa is determined whether it meets the first set humidity value. If not, the compressor frequency is increased until the first set humidity value is met. The indoor air supply temperature Tsa is determined whether it meets the second set temperature value. If not, the compressor frequency is increased. If yes, the current state is maintained.

7. The air conditioning apparatus according to any one of claims 1 through 6, wherein The control module is further configured to: The humidity of the first suction member or the humidity of the second suction member is obtained, and when the humidity meets a set limit value, the second switching device and the first switching device are controlled to switch the heat exchange cavities through which the air supply and the air exhaust flow, and the four-way valve is controlled to switch the flow direction of the refrigerant.

8. The air conditioning apparatus according to claim 7, wherein Before the second switching device and the first switching device are switched, the control module further comprises: The operating frequency of the compressor is unchanged, the opening of the electronic expansion valve is adjusted to increase, and then the opening of the electronic expansion valve is adjusted to decrease after the second switching device and the first switching device are switched, and the adjustment is maintained for a set time; Or, The opening of the electronic expansion valve is unchanged, the frequency of the compressor is adjusted to decrease, and then the frequency of the compressor is adjusted to increase after the second switching device and the first switching device are switched, and the adjustment is maintained for a set time.

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