Indoor unit for fresh air conditioning system and fresh air conditioning system

Abstract

The utility model relates to the technical field of household appliances. The utility model discloses an indoor unit for a fresh air conditioning system. The indoor unit comprises a machine shell, an indoor heat exchanger assembly and an indoor expansion valve. The shell is provided with an air duct; the indoor heat exchanger assembly comprises a first indoor heat exchanger and a second indoor heat exchanger, the first indoor heat exchanger and the second indoor heat exchanger are sequentially arranged in the airflow direction in the air duct, and the first indoor heat exchanger communicates with the second indoor heat exchanger through a first refrigerant flow path; the indoor expansion valve is arranged in the first refrigerant flow path; and the flow direction of a refrigerant in the first refrigerant flow path is limited from the second indoor heat exchanger to the first indoor heat exchanger. According to the arrangement, under the condition that the overall energy consumption of the fresh air conditioning system is not increased, constant-temperature dehumidification or temperature-rise dehumidification can be carried out on the interior of a room. Meanwhile, the utility model further discloses a fresh air conditioning system.

Description

Technical Field

[0001] This application relates to the field of household appliance technology, such as to an indoor unit for a fresh air conditioning system and a fresh air conditioning system. Background Technology

[0002] With societal development, air conditioners have become increasingly widespread. To improve user experience, most air conditioners now include a dehumidification mode, especially in southern regions where dehumidification can significantly improve the quality of life. In dehumidification mode, current air conditioners typically use the indoor heat exchanger as an evaporator, causing moisture in the air flowing through it to condense and thus dehumidify. However, this dehumidification process also lowers the temperature of the air flowing through it. If this dehumidified air is then directly blown into the room, it will cause a drop in indoor temperature.

[0003] In related technologies, to achieve constant temperature dehumidification or heated dehumidification indoors, air conditioners typically include an electric auxiliary heating device between the indoor heat exchanger and the air outlet. This allows the electric auxiliary heating device to heat the dry air, achieving the effect of constant temperature dehumidification or heated dehumidification.

[0004] In the process of implementing the embodiments of this disclosure, at least the following problems were found in the related art:

[0005] In related technologies, existing air conditioners equipped with electric auxiliary heating devices need to continuously operate the electric auxiliary heating devices during the operation of constant temperature dehumidification and heating dehumidification, which increases the overall energy consumption of the air conditioner.

[0006] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0007] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0008] This disclosure provides an indoor unit and a fresh air conditioning system for a fresh air conditioning system. The indoor unit is equipped with multiple indoor heat exchangers, and an expansion valve is installed in the refrigerant flow path connecting the multiple indoor heat exchangers. In this way, by controlling the operating mode of the outdoor unit and coordinating with the expansion valve of the indoor unit, the indoor heat exchanger located upstream of the air duct can be configured as an evaporator, and the indoor heat exchanger located downstream of the air duct can be configured as a condenser. This configuration allows for constant temperature dehumidification or heating dehumidification of the indoor space without increasing the overall energy consumption of the fresh air conditioning system.

[0009] This disclosure provides an indoor unit for a fresh air conditioning system, comprising: a casing, an indoor heat exchanger assembly, and an indoor expansion valve. The casing is provided with an air duct; the indoor heat exchanger assembly includes a first indoor heat exchanger and a second indoor heat exchanger, which are sequentially arranged along the airflow direction within the air duct and are connected via a first refrigerant flow path; the indoor expansion valve is disposed in the first refrigerant flow path; wherein the refrigerant flow direction within the first refrigerant flow path is limited to from the second indoor heat exchanger to the first indoor heat exchanger.

[0010] In some embodiments, the indoor unit further includes a control device and a humidity sensor. The control device is electrically connected to both the outdoor unit and the indoor expansion valve; the humidity sensor is used to acquire indoor humidity; wherein the control device is also electrically connected to the humidity sensor, and the control device can control the operating state of the indoor expansion valve according to the operating mode of the outdoor unit and the indoor humidity.

[0011] In some embodiments, when the outdoor unit is in cooling mode and the indoor humidity is greater than or equal to the humidity threshold, the control device controls the indoor expansion valve to be fully open.

[0012] In some embodiments, when the outdoor unit is in heating mode and the indoor humidity is greater than or equal to the humidity threshold, the control device controls the indoor expansion valve to be in a throttling state.

[0013] In some embodiments, the fresh air conditioning system includes an outdoor unit, which is connected to an indoor unit via a second refrigerant flow path and a third refrigerant flow path. The indoor unit further includes an indoor four-way valve. The indoor four-way valve includes a first interface, a second interface, a third interface, and a fourth interface. The first interface is connected to a first indoor heat exchanger, the second interface is connected to a second indoor heat exchanger, the third interface is connected to the second refrigerant flow path, and the fourth interface is connected to the third refrigerant flow path.

[0014] In some embodiments, the indoor unit further includes a drip tray. The drip tray is disposed below the first indoor heat exchanger and is used to collect condensate dripping from the first indoor heat exchanger.

[0015] In some embodiments, the casing includes a heat exchange chamber and an air supply chamber that are connected to each other. The heat exchange chamber is provided with a return air vent, a fresh air vent, and an exhaust air vent. The air supply chamber is provided with an air supply vent. The return air vent and the air supply vent are respectively connected to the indoor unit, and the fresh air vent and the exhaust air vent are respectively connected to the outdoor unit. The indoor unit also includes a total heat recovery module. The total heat recovery module is disposed in the heat exchange chamber.

[0016] In some embodiments, the indoor unit further includes a humidification component. The humidification component is disposed between the indoor heat exchanger assembly and the air outlet, and is used to humidify the air flowing through it.

[0017] In some embodiments, the indoor unit further includes an electric heating device. The electric heating device is disposed between the indoor heat exchanger assembly and the humidification assembly, and is used to heat the air flowing through it.

[0018] This disclosure also provides a fresh air conditioning system including the aforementioned indoor unit and outdoor unit. The outdoor unit includes an outdoor heat exchanger and an outdoor expansion valve. The outdoor heat exchanger is connected to the indoor four-way valve through a second refrigerant flow path, and the outdoor expansion valve is located in the second refrigerant flow path; wherein, when either the indoor expansion valve or the outdoor expansion valve is in a throttling state, the other is in a fully open state.

[0019] The indoor unit and fresh air conditioning system for a fresh air conditioning system provided in this disclosure can achieve the following technical effects:

[0020] This disclosure provides an indoor unit for a fresh air conditioning system, comprising: a casing, an indoor heat exchanger assembly, and an indoor expansion valve. The casing is provided with an air duct; the indoor heat exchanger assembly includes a first indoor heat exchanger and a second indoor heat exchanger, which are sequentially arranged along the airflow direction within the air duct and connected via a first refrigerant flow path; the indoor expansion valve is disposed in the first refrigerant flow path; wherein the refrigerant flow direction within the first refrigerant flow path is limited to from the second indoor heat exchanger to the first indoor heat exchanger. In this way, the high-temperature refrigerant from the outdoor unit first flows into the second indoor heat exchanger, while the indoor expansion valve is in a throttling state, so that the first indoor heat exchanger is configured as an evaporator and the second indoor heat exchanger is configured as a condenser. With this arrangement, as the airflow sequentially passes through the first and second indoor heat exchangers, it is first dehumidified and then heated, thereby achieving constant-temperature dehumidification and temperature-increasing dehumidification of the indoor environment.

[0021] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0022] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0023] Figure 1 This is a schematic diagram of the structure of an indoor unit provided in an embodiment of this disclosure;

[0024] Figure 2 This is an airflow diagram within the air duct of an indoor unit provided in an embodiment of this disclosure;

[0025] Figure 3 This is a schematic diagram of the structure of a fresh air conditioning system provided in an embodiment of this disclosure;

[0026] Figure 4 This is a refrigerant flow diagram within a fresh air conditioning system provided in this embodiment of the disclosure;

[0027] Figure 5 This is another refrigerant flow diagram in a fresh air conditioning system provided in this embodiment.

[0028] Figure label:

[0029] 10: Housing; 101: Return air vent; 102: Fresh air vent; 103: Exhaust air vent; 104: Supply air vent; 11: Air duct; 12: Humidity sensor;

[0030] 20: Indoor heat exchanger assembly; 21: First indoor heat exchanger; 22: Second indoor heat exchanger; 23: Water collection tray;

[0031] 301: Indoor expansion valve; 302: Outdoor expansion valve; 303: Indoor four-way valve; 304: Outdoor expansion valve; 31: First refrigerant flow path; 32: Second refrigerant flow path; 33: Third refrigerant flow path; 34: Fourth refrigerant flow path;

[0032] 41: Full heat exchange module; 42: Humidification component; 43: Electric heating device;

[0033] 51: Compressor; 52: Outdoor heat exchanger. Detailed Implementation

[0034] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0035] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0036] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this disclosure according to the specific circumstances.

[0037] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0038] Unless otherwise stated, the term "multiple" means two or more.

[0039] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0040] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0041] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0042] like Figures 1 to 5 As shown in the embodiments of this disclosure, an indoor unit and a fresh air conditioning system are provided for a fresh air conditioning system. The indoor unit is equipped with multiple indoor heat exchangers, and an expansion valve is provided in the refrigerant flow path connecting the multiple indoor heat exchangers. In this way, by controlling the operating mode of the outdoor unit and coordinating with the expansion valve of the indoor unit, the indoor heat exchanger located upstream of the air duct can be configured as an evaporator, and the indoor heat exchanger located downstream of the air duct can be configured as a condenser. This configuration allows for constant temperature dehumidification or heating dehumidification of the indoor space without increasing the overall energy consumption of the fresh air conditioning system.

[0043] like Figures 1 to 5 As shown, this embodiment of the present disclosure provides an indoor unit for a fresh air conditioning system, comprising: a casing 10, an indoor heat exchanger assembly 20, and an indoor expansion valve 301. The casing 10 is provided with an air duct 11; the indoor heat exchanger assembly 20 includes a first indoor heat exchanger 21 and a second indoor heat exchanger 22, which are arranged sequentially along the airflow direction within the air duct 11, and are connected through a first refrigerant flow path 31; the indoor expansion valve 301 is disposed in the first refrigerant flow path 31; wherein the refrigerant flow direction within the first refrigerant flow path 31 is limited to from the second indoor heat exchanger 22 to the first indoor heat exchanger 21.

[0044] Specifically, an air outlet 104 is provided inside the casing 10, and a fan is provided inside the air duct 11. The fan's airflow direction is limited to blowing air towards the air outlet 104. The first indoor heat exchanger 21 and the second indoor heat exchanger 22 are arranged sequentially along the fan's airflow direction, so that the air in the air duct 11 is blown into the room from the air outlet 104 after flowing sequentially through the first indoor heat exchanger 21 and the second indoor heat exchanger 22. The refrigerant flow direction in the indoor heat exchanger assembly 20 is limited to flowing from the second indoor heat exchanger 22 to the first indoor heat exchanger 21. The refrigerant in the second indoor heat exchanger 22 can flow into the first indoor heat exchanger 21 through the first refrigerant flow path 31. The indoor expansion valve 301 can be configured to a throttling state or a fully open state. When the indoor expansion valve 301 is configured to a throttling state, it can throttle the refrigerant in the first refrigerant flow path 31.

[0045] like Figure 2 and Figure 4As shown, when the fresh air conditioning system is operating in cooling and dehumidification mode, the outdoor unit is in cooling mode, and the indoor expansion valve 301 is fully open. At this time, the refrigerant in the outdoor unit flows sequentially through the second indoor heat exchanger 22 and the first indoor heat exchanger 21, so that the second indoor heat exchanger 22 and the first indoor heat exchanger 21 are configured as evaporators. Thus, when the air in the air duct 11 flows sequentially through the first indoor heat exchanger 21 and the second indoor heat exchanger 22, the first indoor heat exchanger 21 and the second indoor heat exchanger 22 can simultaneously cool and dehumidify the air.

[0046] like Figure 2 and Figure 4 As shown, when the fresh air conditioning system is operating in constant temperature and dehumidification mode, the outdoor unit is in cooling mode, and the indoor expansion valve 301 is in a throttling state. At this time, the high-temperature refrigerant from the outdoor unit first flows into the second indoor heat exchanger 22, so that the second indoor heat exchanger 22 is configured as a condenser. The refrigerant in the second indoor heat exchanger 22 then flows into the first indoor heat exchanger 21 through the first refrigerant flow path 31, where the indoor expansion valve 301 throttles the refrigerant flow. Then, the low-temperature refrigerant in the first refrigerant flow path 31 flows into the first indoor heat exchanger 21, so that the first indoor heat exchanger 21 is configured as an evaporator. Thus, as air flows sequentially through the first indoor heat exchanger 21 and the second indoor heat exchanger 22, the first indoor heat exchanger 21 dehumidifies the air, and then the second indoor heat exchanger 22 reheats the air to its initial temperature, achieving the effect of constant temperature and dehumidification.

[0047] like Figure 2 and Figure 5 As shown, when the fresh air conditioning system is operating in heating and dehumidification mode, the outdoor unit is in heating mode, and the indoor expansion valve 301 is in a throttling state. At this time, the high-temperature refrigerant from the outdoor unit first flows into the second indoor heat exchanger 22, so that the second indoor heat exchanger 22 is configured as a condenser. The refrigerant in the second indoor heat exchanger 22 then flows into the first indoor heat exchanger 21 through the first refrigerant flow path 31, where the indoor expansion valve 301 throttles the refrigerant flow. Then, the low-temperature refrigerant in the first refrigerant flow path 31 flows into the first indoor heat exchanger 21, so that the first indoor heat exchanger 21 is configured as an evaporator. Thus, as air flows sequentially through the first indoor heat exchanger 21 and the second indoor heat exchanger 22, the first indoor heat exchanger 21 dehumidifies the air, and then the second indoor heat exchanger 22 heats the air, achieving the effect of heating and dehumidification.

[0048] Understandably, when the fresh air conditioning system is in constant temperature dehumidification mode, both the second indoor heat exchanger 22 and the outdoor heat exchanger 52 are configured as condensers, while only the first indoor heat exchanger 21 is configured as an evaporator. Conversely, when the fresh air conditioning system is in heating dehumidification mode, both the first indoor heat exchanger 21 and the outdoor heat exchanger 52 are configured as evaporators, while only the second indoor heat exchanger 22 is configured as a condenser. Therefore, the heating dehumidification mode is more efficient at heating the air and can raise the air temperature to a higher level to achieve the desired dehumidification effect compared to the constant temperature dehumidification mode. Furthermore, actual test results show that in constant temperature dehumidification mode, the temperature difference between the air heated by the second indoor heat exchanger 22 and the initial air temperature is less than or equal to 1°C, indicating better constant temperature dehumidification performance.

[0049] As can be seen, by using the indoor unit of the fresh air conditioning system provided in this application, the operating mode of the outdoor unit can be controlled, and in conjunction with the expansion valve of the indoor unit, the indoor heat exchanger upstream of the air duct 11 can be configured as an evaporator, and the indoor heat exchanger downstream of the air duct 11 can be configured as a condenser. This configuration allows for constant temperature dehumidification or heating dehumidification of the indoor environment without increasing the overall energy consumption of the fresh air conditioning system.

[0050] like Figure 1 As shown, in some embodiments, the indoor unit further includes a control device and a humidity sensor 12. The control device is electrically connected to both the outdoor unit and the indoor expansion valve 301; the humidity sensor 12 is used to acquire indoor humidity; wherein, the control device is also electrically connected to the humidity sensor 12, and the control device can control the working state of the indoor expansion valve 301 according to the operating mode of the outdoor unit and the indoor humidity.

[0051] Specifically, the casing 10 is also equipped with a return air vent 101, which connects to the indoor environment. A fan draws indoor air from the return air vent 101 into the air duct 11. A humidity sensor 12 is located at the return air vent 101 and determines the indoor humidity based on the controlled humidity level of the air flowing through it. When the indoor humidity is high, the control device can control the indoor expansion valve 301 to be in a throttling state or fully open state according to the outdoor unit's operating mode. This configuration improves the coordination between the indoor and outdoor units, thereby dehumidifying the indoor environment while ensuring the cooling and heating effects of the fresh air conditioning system.

[0052] Optionally, the indoor unit also includes a temperature sensor located at the return air vent 101 to obtain the temperature of the air flowing through it, thereby determining the indoor temperature. The control device is also electrically connected to the outdoor unit so that it can control the operating mode of the outdoor unit based on the indoor temperature.

[0053] like Figure 4As shown, in some embodiments, when the outdoor unit is in cooling mode and the indoor humidity is greater than or equal to the humidity threshold, the control device controls the indoor expansion valve 301 to be fully open.

[0054] Specifically, the control device can control the operating mode of the outdoor unit and the working state of the indoor expansion valve 301 based on the indoor humidity and indoor temperature. When the indoor temperature is greater than or equal to the temperature threshold and the indoor humidity is greater than or equal to the humidity threshold, the control device controls the outdoor unit to operate in cooling mode and controls the indoor expansion valve 301 to be fully open. In this way, cooling and dehumidification of the indoor environment can be performed simultaneously through the first indoor heat exchanger 21 and the second indoor heat exchanger 22.

[0055] In practical applications, the temperature and humidity thresholds can be set according to the user's actual needs. For example, the temperature threshold can be 26℃ and the humidity threshold can be 40%. In this way, when the indoor temperature is greater than or equal to 26℃ and the indoor humidity is greater than or equal to 40%, the control device controls the outdoor unit to operate in cooling mode and controls the indoor expansion valve 301 to be fully open.

[0056] like Figure 5 As shown, in some embodiments, when the outdoor unit is in heating mode and the indoor humidity is greater than or equal to the humidity threshold, the control device controls the indoor expansion valve 301 to be in a throttling state.

[0057] Specifically, when the indoor temperature is less than or equal to the temperature threshold and the indoor humidity is greater than or equal to the humidity threshold, the control device controls the outdoor unit to operate in heating mode and controls the indoor expansion valve 301 to be in a throttling state. In this way, the air can be dehumidified through the first indoor heat exchanger 21 and heated through the second indoor heat exchanger 22 to achieve constant temperature dehumidification or temperature-increasing dehumidification. This setup can achieve indoor dehumidification while maintaining a constant indoor temperature or providing effective heating, resulting in a better user experience.

[0058] In some practical applications, when the indoor temperature is less than or equal to 26°C and the indoor humidity is greater than or equal to 40%, the control device controls the outdoor unit to operate in heating mode and controls the indoor expansion valve 301 to be in a throttling state.

[0059] like Figures 3 to 5As shown, in some embodiments, the fresh air conditioning system includes an outdoor unit, which is connected to an indoor unit via a second refrigerant flow path 32 and a third refrigerant flow path 33. The indoor unit also includes an indoor four-way valve 303. The indoor four-way valve 303 includes a first interface, a second interface, a third interface, and a fourth interface. The first interface is connected to a first indoor heat exchanger 21, the second interface is connected to a second indoor heat exchanger 22, the third interface is connected to the second refrigerant flow path 32, and the fourth interface is connected to the third refrigerant flow path 33.

[0060] Specifically, the control device is connected to the indoor four-way valve 303 to control the connection status of the first port (e port), second port (c port), third port (d port), and fourth port (s port) of the indoor four-way valve 303, thereby ensuring that the refrigerant flowing out of the outdoor heat exchanger 52 always flows into the second indoor heat exchanger 22 first. The outdoor unit includes a compressor 51, an outdoor four-way valve 304, an outdoor expansion valve 302, and an outdoor heat exchanger 52. The compressor 51 and the condenser are connected through the fourth refrigerant flow path 34. The outdoor heat exchanger 52 is connected to the indoor unit through the second refrigerant flow path 32, and the compressor 51 is connected through the third refrigerant flow path 33. The outdoor four-way valve 304 is located in both the third and fourth refrigerant flow paths 33 and 34 to control the refrigerant flowing out of the compressor 51 to flow into the outdoor heat exchanger 52 or the indoor unit. The outdoor expansion valve 302 is located in the second refrigerant flow path 32, and the control device can control the outdoor expansion valve 302 to be in a throttling state or a fully open state.

[0061] like Figure 4 As shown, when the fresh air conditioning system is operating in cooling and dehumidification mode, the first port of the indoor four-way valve 303 is connected to the fourth port, and the second port is connected to the third port. At this time, the control device controls the indoor expansion valve 301 to be fully open and controls the outdoor expansion valve 302 to be in a throttling state. In this way, the refrigerant flowing out of the compressor 51 flows sequentially through the outdoor heat exchanger 52, the outdoor expansion valve 302, the second indoor heat exchanger 22, and the first indoor heat exchanger 21 before flowing back to the compressor 51. With this configuration, the outdoor heat exchanger 52 can be configured as a condenser, and the first indoor heat exchanger 21 and the second indoor heat exchanger 22 can be configured as evaporators.

[0062] like Figure 4As shown, when the fresh air conditioning system is operating in constant temperature and dehumidification mode, the first port of the indoor four-way valve 303 is connected to the fourth port, and the second port is connected to the third port. At this time, the control device controls the indoor expansion valve 301 to be in a throttling state and controls the outdoor expansion valve 302 to be in a fully open state. In this way, the refrigerant flowing out of the compressor 51 flows sequentially through the outdoor heat exchanger 52, the second indoor heat exchanger 22, the indoor expansion valve 301, and the first indoor heat exchanger 21 before flowing back to the compressor 51. With this configuration, the outdoor heat exchanger 52 and the second indoor heat exchanger 22 can be configured as condensers, and the first indoor heat exchanger 21 can be configured as an evaporator.

[0063] like Figure 5 As shown, when the fresh air conditioning system is operating under heating and dehumidification conditions, the control device controls the indoor four-way valve 303 and the outdoor four-way valve 304 to switch directions, so that the first and third ports of the indoor four-way valve 303 are connected, and the second and fourth ports are connected. At this time, the control device controls the indoor expansion valve 301 to be fully open and controls the outdoor expansion valve 302 to be in a throttling state. In this way, the refrigerant flowing out of the compressor 51 flows sequentially through the second indoor heat exchanger 22, the indoor expansion valve 301, the first indoor heat exchanger 21, and the outdoor heat exchanger 52 before flowing back to the compressor 51. This configuration allows the first indoor heat exchanger 21 and the outdoor heat exchanger 52 to be configured as evaporators, and the second indoor heat exchanger 22 to be configured as a condenser.

[0064] like Figure 1 As shown, in some embodiments, the indoor unit further includes a drip tray 23. The drip tray 23 is disposed below the first indoor heat exchanger 21 and is used to collect condensate dripping from the first indoor heat exchanger 21.

[0065] Specifically, the water receiving tray 23 is located below the first indoor heat exchanger 21, and the size of the water receiving tray 23 is greater than or equal to the cross-sectional area of ​​the first indoor heat exchanger 21. This arrangement ensures that the projection of the first indoor heat exchanger 21 onto the horizontal plane of the water receiving tray 23 is completely contained within the water receiving tray 23, thereby preventing the condensate on the surface of the first indoor heat exchanger 21 from dripping onto the casing 10 or other components during dehumidification.

[0066] like Figure 1 As shown, optionally, the size of the drip tray 23 is greater than or equal to the size of the indoor heat exchanger assembly 20, that is, the size of the drip tray 23 is greater than or equal to the sum of the cross-sectional areas of the first indoor heat exchanger 21 and the second indoor heat exchanger 22. In this way, the projections of the first indoor heat exchanger 21 and the second indoor heat exchanger 22 onto the horizontal plane where the drip tray 23 is located can both fall completely into the drip tray 23, thereby preventing condensate from dripping from the surfaces of the first indoor heat exchanger 21 and the second indoor heat exchanger 22 onto the casing 10 or other components when the fresh air conditioning system is operating for cooling and dehumidification.

[0067] like Figure 1 and Figure 2 As shown, in some embodiments, the housing 10 includes a heat exchange chamber 13 and an air supply chamber 14 that are connected. The heat exchange chamber 13 is provided with a return air vent 101, a fresh air vent 102, and an exhaust air vent 103. The air supply chamber 14 is provided with an air supply vent 104. The return air vent 101 and the air supply vent 104 are respectively connected to the indoor unit, and the fresh air vent 102 and the exhaust air vent 103 are respectively connected to the outdoor unit. The indoor unit also includes a total heat recovery module. The total heat recovery module is disposed in the heat exchange chamber.

[0068] Specifically, the total heat recovery module is used for heat exchange between air at different temperatures. The total heat recovery module includes a fresh air end, a return air end, an exhaust air end, and a supply air end. The air duct 11 includes a fresh air duct 11, a return air duct 11, an exhaust air duct 11, and a supply air duct 11. The fresh air vent 102 is connected to the fresh air end of the total heat recovery module through the fresh air duct 11; the return air vent 101 is connected to the return air end of the total heat recovery module through the return air duct 11; the exhaust air vent 103 is connected to the exhaust air end of the total heat recovery module through the exhaust air duct 11; and the supply air vent 104 is connected to the supply air end of the total heat recovery module through the supply air duct 11.

[0069] When the fresh air conditioning system is operating in fresh air mode, outdoor air flows into the fresh air duct 11 through the fresh air inlet 102 and then to the fresh air end of the total heat recovery module. The outdoor air then flows into the supply air duct 11 from the supply air end of the total heat recovery module and into the room through the supply air inlet 104 to deliver fresh air into the room. Meanwhile, indoor air flows into the return air duct 11 through the return air inlet 101 and then to the return air end of the total heat recovery module. The indoor air then flows into the exhaust air duct 11 from the exhaust air end of the total heat recovery module and into the outdoor air duct 11, and then out through the exhaust air inlet 103. This configuration allows for heat exchange between indoor and outdoor air at the total heat recovery module, ensuring that the outdoor air temperature is close to the indoor air temperature, thus preventing outdoor air from affecting the indoor temperature.

[0070] Optionally, the indoor heat exchanger assembly 20 is located in the air supply compartment. It is understood that by placing the total heat recovery module in the heat exchange compartment and the indoor heat exchanger assembly 20 in the air supply compartment, the outdoor air temperature can be brought closer to the indoor temperature before the outdoor air is cooled, heated, and dehumidified, which can reduce the overall energy consumption of the fresh air conditioning system.

[0071] like Figure 1 and Figure 2 As shown, in some embodiments, the indoor unit further includes a humidification component 42. The humidification component 42 is disposed between the indoor heat exchanger assembly 20 and the air outlet 104, and is used to humidify the air flowing through it.

[0072] Specifically, the indoor unit also includes a water supply device. The humidification component 42 includes a water storage structure such as a wet film. When the indoor humidity is lower than the humidity threshold, the water supply device supplies water to the humidification component 42. The control device controls the indoor four-way valve 303 and the outdoor four-way valve 304, controls the indoor expansion valve 301 to be fully open, and controls the outdoor expansion valve 302 to be in a throttling state. In this way, the refrigerant flowing out of the compressor 51 flows sequentially through the second indoor heat exchanger 22, the first indoor heat exchanger 21, the outdoor expansion valve 302, and the outdoor heat exchanger 52 before flowing back to the compressor 51. With this configuration, the outdoor heat exchanger 52 can be configured as an evaporator, and the first indoor heat exchanger 21 and the second indoor heat exchanger 22 can be configured as condensers. With this configuration, the air in the air duct 11 will flow sequentially through the first indoor heat exchanger 21, the second indoor heat exchanger 22, and the humidification component 42 before being blown into the room. At this time, the first indoor heat exchanger 21 and the second indoor heat exchanger 22 heat the air, and the humidification component 42 humidifies the hot air, thereby achieving indoor humidification.

[0073] like Figure 1 and Figure 2 As shown, in some embodiments, the indoor unit further includes an electric heating device 43. The electric heating device 43 is disposed between the indoor heat exchanger assembly 20 and the humidification assembly 42, and is used to heat the air flowing through it.

[0074] Specifically, when the indoor temperature is low, the user can also turn on the electric heating device 43 to heat the air flowing through it, thereby quickly raising the indoor temperature.

[0075] like Figures 1 to 5 As shown, this disclosure also provides a fresh air conditioning system including the aforementioned indoor unit and outdoor unit. The outdoor unit includes an outdoor heat exchanger 52 and an outdoor expansion valve 302. The outdoor heat exchanger 52 is connected to the indoor four-way valve 303 through a second refrigerant flow path 32, and the outdoor expansion valve 302 is disposed in the second refrigerant flow path 32; wherein, when either the indoor expansion valve 301 or the outdoor expansion valve 302 is in a throttling state, the other is in a fully open state.

[0076] Specifically, when the fresh air conditioning system is operating in cooling / dehumidification mode, the outdoor expansion valve 302 is in a throttling state, and the indoor expansion valve 301 is fully open; when the fresh air conditioning system is operating in constant temperature / dehumidification mode, the outdoor expansion valve 302 is fully open, and the indoor expansion valve 301 is in a throttling state; when the fresh air conditioning system is operating in heating / dehumidification mode, the outdoor expansion valve 302 is fully open, and the indoor expansion valve 301 is in a throttling state; when the fresh air conditioning system is operating in heating or humidification mode, the outdoor expansion valve 302 is in a throttling state, and the indoor expansion valve 301 is fully open. This configuration avoids situations where both the outdoor expansion valve 302 and the indoor expansion valve 301 are simultaneously in a throttling or fully open state, thus preventing any impact on the cooling and heating performance of the fresh air conditioning system.

[0077] The fresh air conditioning system using the indoor unit of the fresh air conditioning system provided in this application has multiple indoor heat exchangers in its indoor unit, and an expansion valve is installed in the refrigerant flow path connecting the multiple indoor heat exchangers. In this way, by controlling the operating mode of the outdoor unit and coordinating with the expansion valve of the indoor unit, the indoor heat exchanger upstream of the air duct 11 can be configured as an evaporator, and the indoor heat exchanger downstream of the air duct 11 can be configured as a condenser. This configuration allows for constant temperature dehumidification or heating dehumidification of the indoor environment without increasing the overall energy consumption of the fresh air conditioning system.

[0078] The foregoing description and accompanying drawings fully illustrate embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included or substituted for parts and features of other embodiments. Embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims.

Claims

1. An indoor unit for a fresh air conditioning system, characterized in that, include: The casing is equipped with air ducts; An indoor heat exchanger assembly includes a first indoor heat exchanger and a second indoor heat exchanger, wherein the first indoor heat exchanger and the second indoor heat exchanger are arranged sequentially along the airflow direction within the air duct, and the first indoor heat exchanger and the second indoor heat exchanger are connected through a first refrigerant flow path; and, An indoor expansion valve is installed in the first refrigerant flow path; Wherein, the refrigerant flow direction in the first refrigerant flow path is limited to from the second indoor heat exchanger to the first indoor heat exchanger.

2. The indoor unit according to claim 1, characterized in that, Also includes: The control device is electrically connected to both the outdoor unit and the indoor expansion valve; and, A humidity sensor is used to obtain indoor humidity. The control device is also electrically connected to the humidity sensor, and the control device can control the working state of the indoor expansion valve according to the operating mode of the outdoor unit and the indoor humidity.

3. The indoor unit according to claim 2, characterized in that, When the outdoor unit is in cooling mode and the indoor humidity is greater than or equal to the humidity threshold, the control device controls the indoor expansion valve to be fully open.

4. The indoor unit according to claim 2, characterized in that, When the outdoor unit is in heating mode and the indoor humidity is greater than or equal to the humidity threshold, the control device controls the indoor expansion valve to be in a throttling state.

5. The indoor unit according to claim 1, characterized in that, The fresh air conditioning system includes an outdoor unit, which is connected to the indoor unit through a second refrigerant flow path and a third refrigerant flow path. The indoor unit also includes: An indoor four-way valve includes a first port, a second port, a third port, and a fourth port. The first port is connected to the first indoor heat exchanger, the second port is connected to the second indoor heat exchanger, the third port is connected to the second refrigerant flow path, and the fourth port is connected to the third refrigerant flow path.

6. The indoor unit according to claim 1, characterized in that, Also includes: A drip tray is located below the first indoor heat exchanger and is used to collect condensate dripping from the first indoor heat exchanger.

7. The indoor unit according to claim 1, characterized in that, The casing includes a heat exchange chamber and an air supply chamber that are connected. The heat exchange chamber is provided with a return air vent, a fresh air vent and an exhaust air vent. The air supply chamber is provided with an air supply vent. The return air vent and the air supply vent are respectively connected to the interior, and the fresh air vent and the exhaust air vent are respectively connected to the outside. The indoor unit also includes: A total heat recovery module is installed in the heat exchange chamber.

8. The indoor unit according to claim 7, characterized in that, Also includes: A humidification component is disposed between the indoor heat exchanger assembly and the air outlet, and the humidification component is used to humidify the air flowing through it.

9. The indoor unit according to claim 8, characterized in that, Also includes: An electric heating device is disposed between the indoor heat exchanger assembly and the humidification assembly, and the electric heating device is used to heat the air flowing through it.

10. A fresh air conditioning system, characterized in that, include: The indoor unit as described in any one of claims 1 to 9; and, The outdoor unit includes an outdoor heat exchanger and an outdoor expansion valve. The outdoor heat exchanger is connected to the indoor four-way valve through a second refrigerant flow path, and the outdoor expansion valve is located in the second refrigerant flow path. When either the indoor expansion valve or the outdoor expansion valve is in a throttling state, the other is in a fully open state.

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