Indoor unit assembly, control method thereof, and air conditioning unit

Abstract

The application discloses an indoor unit assembly, a control method thereof and an air conditioning unit, and solves the problem of affecting user experience when the air conditioner performs self-cleaning in the prior art. The indoor unit assembly comprises an indoor unit, the indoor unit has an indoor unit air inlet and an indoor unit air outlet, and a fresh air structure. The indoor unit assembly, the control method thereof and the air conditioning unit can discharge dry cold gas generated during the self-cleaning process of the indoor unit to the outdoor through the fresh air structure, and recycle high-temperature gas, that is, the influence on the indoor temperature can be reduced, the recycling of the heat pump can be realized, the energy consumption of the air conditioning unit can be reduced by reducing the compressor frequency of the air conditioning unit, and the outdoor fresh air can be introduced into the indoor to reduce the influence on the indoor humidity during the self-cleaning process of the indoor unit, the comfort of the user is effectively improved, and the use experience of the user is improved.

Description

Technical Field

[0001] This invention relates to the field of air handling equipment technology, and more specifically, to an indoor unit component and its control method, and an air conditioning unit. Background Technology

[0002] When the indoor unit of an air conditioner is turned off during cooling operation, the temperature of the heat exchanger and air duct is lower than the ambient temperature, which will produce condensation. After the air conditioner is turned off, there is no air flow inside the indoor unit. In the long-term humid environment, bacteria and mold are easy to grow. When the air conditioner is turned on again, the indoor air will carry bacteria when it flows through the indoor unit and then blow it into the room, affecting air quality and human health.

[0003] While some air conditioners now have evaporator self-cleaning functions, the existing evaporator self-cleaning process involves a long cycle of condensation, frosting, defrosting, drying, and 56°C high-temperature sterilization. This results in time-consuming and energy-intensive self-cleaning processes. Furthermore, the drying and high-temperature sterilization processes raise the indoor temperature, affecting user comfort and reducing the user experience. Summary of the Invention

[0004] This invention discloses an indoor unit component and its control method that utilize a fresh air structure to reduce the impact of gases generated during the self-cleaning of the indoor unit on the indoor temperature, and to reduce the energy consumption and time of self-cleaning. This invention solves the problem of the impact on user experience during the self-cleaning of air conditioners in the prior art.

[0005] This invention discloses an indoor unit component, comprising: The indoor unit has an indoor unit air inlet and an indoor unit air outlet; The fresh air structure is installed on the indoor unit and has an indoor connection port, a first exhaust port, a second exhaust port and an outdoor connection port. The indoor connection port is located at the air inlet of the indoor unit, the first exhaust port is connected to the indoor space where the indoor unit is located, the second exhaust port is connected to the air outlet of the indoor unit, and the outdoor connection port is connected to the outside. The fresh air structure has a fresh air state where the outdoor connection port is connected to the indoor connection port, a first exhaust state where the first exhaust port is connected to the outdoor connection port, a second exhaust state where both the first exhaust port and the second exhaust port are connected to the outdoor connection port, and a circulation state where the second exhaust port is connected to the indoor connection port.

[0006] The fresh air structure includes a housing, a fan, and a filter structure. The housing contains a fan chamber, a filter chamber, and a connecting chamber. The fan is disposed within the fan chamber, and the filter structure is disposed within the filter chamber, dividing the filter chamber into a first space and a second space. The fan chamber is connected to the first space. The fan chamber has a first air vent and a second air vent. The first space has a third air vent, the second space has a fourth air vent, and the connecting chamber has a fifth air vent and a sixth air vent. The first air vent forms the indoor connecting port, the third air vent forms the first exhaust port, the fifth air vent forms the second exhaust port, and the sixth air vent forms the outdoor connecting port. The fan chamber is connected to the connecting chamber via the second air vent, and the second space is connected to the connecting chamber via the fourth air vent.

[0007] The fresh air structure also includes a first air valve, which is movably disposed on the housing, and the first air valve can close the third air outlet and open the first air outlet or close the first air outlet and open the third air outlet.

[0008] The fresh air structure also includes a second air valve, which is movably disposed within the housing and is capable of closing the second air outlet and opening the fourth air outlet or closing the fourth air outlet and opening the second air outlet.

[0009] The cross-section of the fan cavity is circular, and the inner wall of the second air valve is arc-shaped to form part of the inner wall of the fan cavity.

[0010] The second air valve is provided with a connecting channel. When the second air valve closes the third air outlet, the second exhaust outlet can be connected to the outdoor connecting outlet through the connecting channel.

[0011] The fresh air structure also includes a side air duct, which is disposed on the housing, with its first end connected to the connecting cavity and its second end forming the indoor connecting port.

[0012] The fresh air structure includes a fourth air valve, which is located at the first end of the side air duct and can open or close the side air duct.

[0013] The fresh air structure also includes a third air valve, which is movably disposed within the housing and is capable of opening or closing the sixth air inlet.

[0014] The indoor unit includes an air guide plate, which is disposed at the air outlet of the indoor unit and can open or close the air outlet of the indoor unit.

[0015] The indoor unit also includes a heat exchanger, which is disposed between the indoor unit's air inlet and air outlet.

[0016] Another aspect of the present invention provides a control method for the above-described indoor unit component, comprising: The indoor unit component has a self-cleaning mode. When the indoor unit component is in the self-cleaning mode, the fresh air structure is controlled to switch to at least one of the following modes according to preset conditions: internal circulation mode, second exhaust mode, or fresh air mode.

[0017] The indoor unit has two working states: a heat exchanger frosting state and a heat exchanger defrosting state. When the indoor unit is in the self-cleaning mode, the indoor unit cycles between the heat exchanger frosting state and the heat exchanger defrosting state. The operating state of the indoor unit constitutes the preset conditions; When the indoor unit is in a state where the heat exchanger is frosted, the fresh air structure switches to the second exhaust air state; When the indoor unit is in the defrosting state of the heat exchanger, the fresh air structure switches to the circulation state.

[0018] When the indoor unit exits the defrosting state of the heat exchanger, the fresh air structure is controlled to maintain the circulation state or switch to the fresh air state.

[0019] The indoor unit has an air guide plate, which is disposed at the air outlet of the indoor unit and can open or close the air outlet of the indoor unit. In the process of switching the fresh air structure to recirculation mode, the following is also included: Obtain the indoor-outdoor humidity difference value ΔH, and compare ΔH with a first preset value a; If △H≤a, then the fresh air structure is controlled to maintain a circulating state; If △H>a, then control the fresh air structure to switch to fresh air state.

[0020] The fresh air structure includes a fan with adjustable speed. If ΔH > a, the fresh air structure is controlled to switch to fresh air mode. It also includes: Compare △H with the second preset value b and the third preset value c; If a < ΔH < b, then control the fan to rotate at the first speed v1; If b≤△H≤c, then control the fan to rotate at the second speed v2; If ΔH > c, then control the fan to rotate at the third speed v3; Where a < b < c, v1 < v2 < v3.

[0021] Another aspect of the present invention provides an air conditioning unit including the above-described indoor unit assembly or a control method using the above-described indoor unit assembly.

[0022] The indoor unit component and control method of the present invention, as well as the air conditioning unit, are equipped with a fresh air structure on the indoor unit. The fresh air structure can exhaust the dry and cold gas generated during the self-cleaning process of the indoor unit to the outside and recycle the high-temperature gas. This can reduce the impact on the indoor temperature and realize the recycling of the heat pump. The energy consumption of the air conditioning unit can be reduced by reducing the compressor frequency of the air conditioning unit. Moreover, it can introduce outdoor fresh air into the room, reduce the impact of the indoor unit's self-cleaning process on the indoor humidity, effectively improve user comfort, and thus improve the user experience. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the indoor unit component according to an embodiment of the present invention; Figure 2 This is another structural schematic diagram of the indoor unit component according to an embodiment of the present invention; Figure 3 This is a gas flow diagram of the indoor unit components when the fresh air structure of this embodiment is in the second exhaust air state; Figure 4 This is a diagram showing the gas flow direction of the indoor unit components when the fresh air structure is in the fresh air state according to an embodiment of the present invention. Figure 5 This is a schematic diagram of the fresh air structure according to an embodiment of the present invention; Figure 6 This is another schematic diagram of the fresh air structure according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the closed third air vent of the fresh air structure according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the opening of the third air vent in the fresh air structure of an embodiment of the present invention; Figure 9 This is a cross-sectional view of the fresh air structure according to an embodiment of the present invention; Figure 10 This is another cross-sectional view of the fresh air structure according to an embodiment of the present invention; Figure 11 This is another cross-sectional view of the fresh air structure according to an embodiment of the present invention; Figure 12 This is a gas flow diagram of the fresh air structure in the second exhaust state according to an embodiment of the present invention; Figure 13 This is another cross-sectional view of the fresh air structure according to an embodiment of the present invention; Figure 14 This is a schematic diagram of the second air valve in the fresh air structure of an embodiment of the present invention; Legend: 1. Indoor unit; 11. Indoor unit air inlet; 12. Indoor unit air outlet; 2. Fresh air structure; 201. Indoor connection port; 202. First exhaust port; 203. Second exhaust port; 204. Outdoor connection port; 21. Housing; 22. Fan; 23. Filter structure; 24. Fan cavity; 25. First space; 26. Second space; 27. Second air outlet; 28. Fourth air outlet; 29. ​​Side air duct; 31. First air valve; 32. Second air valve; 321. Connecting channel; 33. Fourth air valve; 34. Third air valve; 5. Air guide plate. Detailed Implementation

[0024] The present invention will be further described below with reference to embodiments, but is not limited to the contents of the specification.

[0025] like Figures 1 to 14As shown, this invention discloses an indoor unit assembly, comprising: an indoor unit 1 having an indoor unit air inlet 11 and an indoor unit air outlet 12; and a fresh air structure 2 disposed on the indoor unit 1, the fresh air structure 2 having an indoor connection port 201, a first exhaust port 202, a second exhaust port 203, and an outdoor connection port 204, the indoor connection port 201 being located at the indoor unit air inlet 11, the first exhaust port 202 being connected to the indoor space where the indoor unit assembly is located, the second exhaust port 203 being connected to the outdoor connection port 204, the indoor connection port 201 being located at the indoor unit air inlet 11, the first exhaust port 202 being connected to the indoor space where the indoor unit assembly is located, the second exhaust port 203 being connected to the outdoor connection port 204, the indoor connection port 201 being located at the indoor unit air inlet 11, the first exhaust port 202 being connected to the indoor space where the indoor unit assembly is located, the second exhaust port 203 being connected to the outdoor connection port 204, the indoor connection port 201 being located at the indoor unit air inlet 11, the first exhaust port 202 being connected to the outdoor connection port 204, the second ... The second exhaust vent 203 is connected to the indoor unit's air outlet 12, and the outdoor connection vent 204 is connected to the outside. The fresh air structure 2 has a fresh air state where the outdoor connection vent 204 is connected to the indoor connection vent 201, a first exhaust state where the first exhaust vent 202 is connected to the outdoor connection vent 204, a second exhaust state where both the first exhaust vent 202 and the second exhaust vent 203 are connected to the outdoor connection vent 204, and a circulation state where the second exhaust vent 203 is connected to the indoor connection vent 201. By installing the fresh air structure 2 on the indoor unit 1, the dry, cold air generated during the self-cleaning process of the indoor unit 1 can be exhausted to the outside, while the high-temperature air can be recycled. This reduces the impact on indoor temperature and enables the recycling of the heat pump. Energy consumption of the air conditioning unit can be reduced by lowering the compressor frequency, etc. Furthermore, it introduces fresh outdoor air into the room, reducing the impact of the indoor unit 1's self-cleaning process on indoor humidity, effectively improving user comfort and thus enhancing the user experience. After indoor unit 1 finishes cooling, the indoor unit components dehumidify. By switching the fresh air structure 2 (for example, switching to the second exhaust mode), the humid air inside indoor unit 1 is discharged, making the temperature of the heat exchanger and air duct similar to the ambient temperature, thus preventing condensation. It can also quickly dry the water droplets in the heat exchanger and air duct, preventing the growth of bacteria. At the same time, it can also reduce dust on the heat exchanger, preventing the performance of indoor unit components from deteriorating. In addition, fresh air can be introduced from the outside to ensure that the indoor humidity meets the user's needs and improve the reliability of indoor unit components.

[0026] Specifically, the fresh air structure 2 includes a housing 21, a fan 22, and a filter structure 23. The housing 21 has a fan chamber 24, a filter chamber, and a connecting chamber inside. The fan 22 is disposed in the fan chamber 24, and the filter structure 23 is disposed in the filter chamber, dividing the filter chamber into a first space 25 and a second space 26. The fan chamber 24 is connected to the first space 25. The fan chamber 24 is provided with a first air outlet and a second air outlet 27. The first space 25 is provided with a third air outlet, and the second space 26 is provided with a fourth air outlet 28. The connecting chamber is provided with a fifth air outlet and a sixth air outlet. The first air outlet constitutes the indoor connecting port 201, the third air outlet constitutes the first exhaust air outlet 202, the fifth air outlet constitutes the second exhaust air outlet 203, and the sixth air outlet constitutes the outdoor connecting port 204. The fan chamber 24 is connected to the connecting chamber through the second air outlet 27, and the second space 26 is connected to the connecting chamber through the fourth air outlet 28. An auxiliary channel structure is provided at the indoor connection port 201. The auxiliary channel structure can adjust the direction of the gas sent to the indoor unit air inlet 11, so that the gas can be blown out in the length direction of the indoor unit air inlet 11, thereby improving the reliability of the gas flowing to the indoor unit air inlet 11 entering the indoor unit 1.

[0027] When the fresh air structure 2 is in fresh air mode, the first air vent, the fourth air vent 28, and the sixth air vent are open, while the second air vent 27, the third air vent, and the fifth air vent are closed. At this time, the outdoor fresh air, under the action of the fan 22, can be introduced into the connecting cavity through the sixth air vent and sent into the second space 26 through the fourth air vent 28. After being filtered by the filter structure 23, it enters the first space 25 and is finally sent into the fan cavity 24 and sent to the indoor unit air inlet 11 through the first air vent, thereby introducing fresh air into the room to replace the indoor air and increase the indoor humidity. At this time, the indoor unit 1 can work, and the fresh air is introduced into the indoor unit 1 for heat exchange and sent into the room through the indoor unit air outlet 12; or, the indoor unit 1 stops working, and the fresh air directly diffuses into the room from the indoor unit air inlet 11.

[0028] When the fresh air structure 2 is in the first exhaust state, the second air vent 27, the third air vent, and the sixth air vent are opened, while the first air vent, the fourth air vent 28, and the fifth air vent are closed. At this time, the indoor air is introduced into the first space 25 through the second air vent 27 under the action of the fan 22, and flows directly into the fan cavity 24. It is then discharged into the connecting cavity through the second air vent 27 of the fan cavity 24, and finally discharged to the outside through the sixth air vent, thus realizing the exhaust of indoor air.

[0029] When the fresh air structure 2 is in the second exhaust state, the second air vent 27, the third air vent, the fifth air vent, and the sixth air vent are open, while the first air vent and the fourth air vent 28 are closed. At this time, not only can indoor air be exhausted to the outside, but also, due to the negative pressure state at the connecting cavity, when the fifth air vent is opened, the indoor unit's air outlet 12 is connected to the connecting cavity. At this time, the air at the indoor unit's air outlet 12 can be introduced into the connecting cavity under the action of negative pressure and finally exhausted through the sixth air vent. When the heat exchanger of the indoor unit 1 is condensing, frosting, defrosting, and drying, the dry and cold air generated during the condensation and frosting process can be directly exhausted to the outside, avoiding the impact of dry and cold air on the indoor temperature and improving the user experience.

[0030] When the fresh air structure 2 is in circulation mode, the first air vent, the fourth air vent 28, and the fifth air vent are open, while the second air vent 27, the third air vent, and the sixth air vent are closed. At this time, the air at the indoor unit's air outlet 12 enters the connecting cavity through the fifth air vent under the action of the fan 22, and is then sent into the second space 26 through the fourth air vent 28. After being filtered by the filter structure 23, it enters the first space 25 and is finally sent into the fan cavity 24 and then into the indoor unit's air inlet 11 through the first air vent. This allows the high-temperature air generated at the indoor unit's air outlet 12 to be recycled. The purpose of gas recycling is to carry dust and other debris from the heat exchanger to the filter structure 23 for filtration, thereby cleaning the heat exchanger. In particular, during the processes of condensation, frost, defrosting, and drying of the heat exchanger in the indoor unit 1, the high-temperature gas (generally 56°C) generated during defrosting and drying can be recycled, realizing the reuse of heat and effectively improving energy efficiency. At the same time, it can reduce the compressor frequency of the air conditioning unit where the indoor unit components are located, reduce energy consumption, and also avoid the impact of high-temperature gas on indoor temperature, thus improving the user experience.

[0031] To achieve state switching of the fresh air structure 2, the fresh air structure 2 further includes a first air valve 31, which is movably mounted on the housing 21. The first air valve 31 can close the third air vent and open the first air vent, or close the first air vent and open the third air vent. That is, the working states of the first air vent and the third air vent are opposite. When the first air vent is open, the third air vent is closed, and when the third air vent is open, the first air vent is closed. This avoids the airflow from circulating directly within the first air vent, the third air vent, and the fan cavity 24 when the first and third air vents are open simultaneously, thus preventing the fan 22 from malfunctioning and ensuring the reliable operation of the fresh air structure 2 and the indoor unit components.

[0032] Similarly, the fresh air structure 2 also includes a second air valve 32, which is movably disposed within the housing 21. The second air valve 32 can close the second air vent 27 and open the fourth air vent 28, or close the fourth air vent 28 and open the second air vent 27. That is, the second air vent 27 and the fourth air vent 28 operate in opposite states. When the second air vent 27 is open, the fourth air vent 28 is closed, and when the fourth air vent 28 is open, the second air vent 27 is closed. This avoids the airflow from circulating directly within the second air vent 27, the fourth air vent 28, and the fan cavity 24 when the second air vent 27 and the fourth air vent 28 are open simultaneously, thus preventing the fan 22 from malfunctioning and ensuring the reliable operation of the fresh air structure 2 and the indoor unit components. The fan 22 is a centrifugal fan. The axial air inlet of the centrifugal fan 22 faces and communicates with the first space 25. The first air outlet and the second air outlet 27 are both located around the centrifugal fan 22, forming its air outlet. When the first air outlet is open, the centrifugal fan 22 discharges air in a first direction, and the second air outlet 27 needs to remain closed. Similarly, when the second air outlet 27 is open, the centrifugal fan 22 discharges air in a second direction, and the first air outlet needs to remain closed. This allows for reliable adjustment of the air outlet direction of the centrifugal fan 22, thereby adjusting the state of the fresh air structure 2 according to the air outlet direction. For this purpose, the cross-section of the fan cavity 24 is circular, and the inner wall of the second air valve 32 is arc-shaped to partially form the inner wall of the fan cavity 24, ensuring the reliable operation of the fan 22. As shown in the figure, the second air valve 32 needs to move within the connecting cavity. When the second air valve 32 moves upward, it will occupy part of the space in the connecting cavity, making it impossible for the second exhaust vent 203 to connect with the sixth air vent. Therefore, the second air valve 32 is provided with a connecting channel 321. When the second air valve 32 closes the third air vent, the second exhaust vent 203 can connect with the outdoor connecting vent 204 through the connecting channel 321. The exhaust air from the second exhaust vent 203 can flow smoothly to the sixth air vent, ensuring that the gas from the indoor unit's air outlet 12 is reliably discharged to the outside.

[0033] The fresh air structure 2 also includes a side air duct 29, which is disposed on the housing 21. The first end of the side air duct 29 is connected to the connecting cavity, and the second end forms the indoor connecting port 201. Using the side air duct 29, the air from the indoor unit's air outlet 12 is directed to a position near the sixth air outlet, so that the airflow blown by the fan 22 from the second air outlet 27 can generate negative pressure at the first end of the side air duct 29. This negative pressure can then draw the air at the indoor connecting port 201 (the indoor unit's air outlet 12) into the connecting cavity and finally discharge it to the outside.

[0034] The fresh air structure 2 includes a fourth air valve 33, which is located at the first end of the side air duct 29 and can open or close the side air duct 29. The fourth air valve 33 controls whether the side air duct 29 is open. When the fourth air valve 33 closes the side air duct 29, the gas from the indoor unit's air outlet 12 cannot enter the connecting cavity, and the gas in the connecting cavity cannot flow to the indoor unit's air outlet 12. When the fourth air valve 33 opens the side air duct 29, the fan 22 generates negative pressure at the first end of the side air duct 29, ensuring that the gas in the side air duct 29 flows from the first end to the second end, thus ensuring the reliable operation of the fresh air structure 2.

[0035] The fresh air structure 2 also includes a third air valve 34, which is movably disposed within the housing 21 and can open or close the sixth air inlet. By controlling the sixth air inlet using the third air valve 34, gas is prevented from flowing out through the sixth air inlet during circulation, ensuring reliable heat recovery of the fresh air structure 2.

[0036] The indoor unit 1 includes an air guide plate 5, which is disposed at the air outlet 12 of the indoor unit and can open or close the air outlet 12. When cleaning the heat exchanger of the indoor unit 1, the dry and cold gas generated during condensation and frosting flows to the air outlet 12 of the indoor unit. During defrosting and drying, the high-temperature gas generated also flows to the air outlet 12 of the indoor unit. Both types of gas affect the indoor temperature. Therefore, the air guide plate 5 closes the air outlet 12 of the indoor unit, so that the gas can only flow into the fresh air structure 2 through the fifth air vent. Then, depending on the state of the fresh air structure 2, the gas is either circulated or discharged to the outside.

[0037] The indoor unit 1 also includes a heat exchanger, which is disposed between the indoor unit air inlet 11 and the indoor unit air outlet 12. When the indoor unit 1 is cooling or heating, the gas in the indoor unit air inlet 11 exchanges heat with the heat exchanger and is finally discharged from the indoor unit air outlet 12, thereby controlling the indoor temperature.

[0038] Another aspect of the present invention provides a control method for the above-described indoor unit component, comprising: The indoor unit component has a self-cleaning mode. When the indoor unit component is in the self-cleaning mode, the fresh air structure 2 is controlled to switch to at least one of the following modes according to preset conditions: internal circulation mode, second exhaust mode, or fresh air mode.

[0039] The indoor unit 1 has two working states: a heat exchanger frosting state and a heat exchanger defrosting state. When the indoor unit is in the self-cleaning mode, the indoor unit 1 cycles between the heat exchanger frosting state and the heat exchanger defrosting state. When the indoor unit 1 is in the heat exchanger frosting state, the heat exchanger cools down the gas flowing through it, and the gas can condense and frost on the heat exchanger. When the indoor unit 1 is in the heat exchanger defrosting state, the heat exchanger heats up and melts the frost layer on the heat exchanger. At the same time, the hot air generated by the auxiliary heating structure inside the indoor unit 1 can circulate in the heat exchanger to heat or even dry the heat exchanger. The operating state of the indoor unit 1 constitutes the preset conditions; When the indoor unit 1 is in the state of heat exchanger frosting, the fresh air structure 2 switches to the second exhaust air state. At this time, dry and cold gas is generated in the indoor unit 1, and the fresh air structure 2 exhausts the dry and cold gas flowing to the indoor unit air outlet 12 to the outside, thereby avoiding the problem of indoor temperature drop. When the indoor unit 1 is in the defrosting state of the heat exchanger, the fresh air structure 2 switches to the circulation state. At this time, high-temperature gas is generated inside the indoor unit 1. The fresh air structure 2 sends the high-temperature gas flowing to the air outlet 12 of the indoor unit into the fresh air structure 2 for circulation, thereby sending the filtered high-temperature gas back to the heat exchanger of the indoor unit 1 to defrost and dry the heat exchanger, reducing the energy consumption of the indoor unit components and improving energy utilization.

[0040] Because the process of condensation and frosting on the heat exchanger consumes moisture in the gas and causes a decrease in the humidity of the gas, in order to ensure the indoor humidity requirements, when the indoor unit 1 exits the defrosting state of the heat exchanger, the fresh air structure 2 is controlled to maintain the circulation state or switch to the fresh air state to introduce outdoor fresh air into the room to supplement the indoor humidity and improve the user experience.

[0041] The indoor unit 1 has an air guide plate 5, which is disposed at the air outlet 12 of the indoor unit and can open or close the air outlet 12 of the indoor unit. When the fresh air structure 2 switches to the circulation state, it further includes: Obtain the indoor-outdoor humidity difference value ΔH, and compare ΔH with a first preset value a; If △H≤a, it indicates that the difference between indoor and outdoor humidity is small, and there is no need to supplement the indoor humidity. In this case, the fresh air structure 2 is controlled to maintain the circulation state, and the heat exchanger is in normal defrosting and drying state. If △H>a, it indicates that the indoor humidity is low and the difference between indoor and outdoor humidity is large. In this case, the fresh air structure 2 is switched to fresh air mode to introduce outdoor fresh air into the room to supplement indoor humidity and improve user experience.

[0042] The indoor-outdoor humidity difference ΔH is defined as: ΔH = (Houtdoor - Hindoor) / Hindoor, where Houtdoor is the outdoor humidity value and Hindoor is the indoor humidity value. The first preset value a ranges from 5% to 15%, preferably 10%.

[0043] The fresh air structure 2 includes a fan 22, the speed of which is adjustable. If ΔH > a, the fresh air structure 2 is controlled to switch to fresh air mode. It also includes: Compare △H with the second preset value b and the third preset value c; If a < ΔH < b, then control the fan 22 to rotate at the first speed v1; If b≤△H≤c, then control the fan 22 to rotate at the second speed v2; If △H>c, then control the fan 22 to rotate at the third speed v3; Where a < b < c, v1 < v2 < v3, the speed of replenishing indoor humidity is adjusted by switching the rotation speed of fan 22, thereby replenishing indoor humidity to the user's desired level as quickly as possible and improving user experience. The value of b ranges from 15% to 25%, preferably 20%. The value of c ranges from 25% to 35%, preferably 30%.

[0044] Another aspect of the present invention provides an air conditioning unit including the above-described indoor unit assembly or a control method using the above-described indoor unit assembly.

[0045] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is impossible to exhaustively list all embodiments here. All obvious variations or modifications derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. An indoor unit assembly, comprising: include: Indoor unit (1), the indoor unit (1) having an indoor unit air inlet (11) and an indoor unit air outlet (12); A fresh air structure (2) is installed on the indoor unit (1), and the fresh air structure (2) has an indoor connection port (201), a first exhaust port (202), a second exhaust port (203) and an outdoor connection port (204). The indoor connection port (201) is located at the air inlet (11) of the indoor unit. The first exhaust port (202) is connected to the indoor space where the indoor unit is located. The second exhaust port (203) is connected to the air outlet (12) of the indoor unit. The outdoor connection port (204) is connected to the outside. The fresh air structure (2) has a fresh air state in which the outdoor connection port (204) is connected to the indoor connection port (201), a first exhaust state in which the first exhaust port (202) is connected to the outdoor connection port (204), a second exhaust state in which both the first exhaust port (202) and the second exhaust port (203) are connected to the outdoor connection port (204), and a circulation state in which the second exhaust port (203) is connected to the indoor connection port (201).

2. The indoor unit assembly of claim 1, wherein: The fresh air structure (2) includes a housing (21), a fan (22), and a filter structure (23). The housing (21) contains a fan chamber (24), a filter chamber, and a connecting chamber. The fan (22) is located within the fan chamber (24), and the filter structure (23) is located within the filter chamber, dividing the filter chamber into a first space (25) and a second space (26). The fan chamber (24) and the first space (25) are connected. The fan chamber (24) has a first air outlet and a second air outlet (27). A third air vent is provided on (25), a fourth air vent (28) is provided on the second space (26), a fifth air vent and a sixth air vent are provided on the connecting cavity, the first air vent constitutes the indoor connecting opening (201), the third air vent constitutes the first exhaust air vent (202), the fifth air vent constitutes the second exhaust air vent (203), the sixth air vent constitutes the outdoor connecting opening (204), the fan cavity (24) is connected to the connecting cavity through the second air vent (27), and the second space (26) is connected to the connecting cavity through the fourth air vent (28).

3. The indoor unit assembly according to claim 2, characterized in that, The fresh air structure (2) further includes a first air valve (31), which is movably disposed on the housing (21), and the first air valve (31) can close the third air outlet and open the first air outlet or close the first air outlet and open the third air outlet.

4. The indoor unit assembly according to claim 2, characterized in that, The fresh air structure (2) further includes a second air valve (32), which is movably disposed within the housing (21). The second air valve (32) can close the second air outlet (27) and open the fourth air outlet (28) or close the fourth air outlet (28) and open the second air outlet (27).

5. The indoor unit assembly according to claim 4, characterized in that, The cross-section of the fan cavity (24) is circular, and the inner wall of the second air valve (32) is arc-shaped to form part of the inner wall of the fan cavity (24).

6. The indoor unit assembly according to claim 5, characterized in that, The second air valve (32) is provided with a connecting channel (321). When the second air valve (32) closes the third air outlet, the second exhaust outlet (203) can be connected to the outdoor connecting outlet (204) through the connecting channel (321).

7. The indoor unit assembly according to claim 6, characterized in that, The fresh air structure (2) also includes a side air duct (29), which is disposed on the housing (21), and the first end of the side air duct (29) is connected to the connecting cavity, and the second end constitutes the indoor connecting port (201).

8. The indoor unit assembly according to claim 7, characterized in that, The fresh air structure (2) includes a fourth air valve (33), which is located at the first end of the side air duct (29) and can open or close the side air duct (29).

9. The indoor unit assembly according to claim 2, characterized in that, The fresh air structure (2) also includes a third air valve (34), which is movably disposed within the housing (21) and can open or close the sixth air outlet.

10. The indoor unit assembly according to claim 1, characterized in that, The indoor unit (1) includes an air guide plate (5), which is located at the air outlet (12) of the indoor unit and can open or close the air outlet (12) of the indoor unit.

11. The indoor unit assembly according to claim 10, characterized in that, The indoor unit (1) also includes a heat exchanger, which is disposed between the indoor unit air inlet (11) and the indoor unit air outlet (12).

12. A control method for an indoor unit assembly according to any one of claims 1 to 11, characterized in that, include: The indoor unit component has a self-cleaning mode. When the indoor unit component is in the self-cleaning mode, the fresh air structure (2) is controlled to switch to at least one of the following modes according to preset conditions: internal circulation mode, second exhaust mode, or fresh air mode.

13. The control method according to claim 12, characterized in that, The indoor unit (1) has a working state of heat exchanger frosting state and heat exchanger defrosting state. When the indoor unit component is in the self-cleaning mode, the indoor unit (1) cycles between the heat exchanger frosting state and the heat exchanger defrosting state. The working state of the indoor unit (1) constitutes the preset conditions; When the indoor unit (1) is in the state of heat exchanger frosting, the fresh air structure (2) switches to the second exhaust state; When the indoor unit (1) is in the defrosting state of the heat exchanger, the fresh air structure (2) switches to the circulation state.

14. The control method according to claim 13, characterized in that, When the indoor unit (1) exits the defrosting state of the heat exchanger, the fresh air structure (2) is controlled to maintain the circulation state or switch to the fresh air state.

15. The control method according to claim 14, characterized in that, The indoor unit (1) has an air guide plate (5), which is located at the air outlet (12) of the indoor unit and can open or close the air outlet (12). When the fresh air structure (2) switches to the circulation state, it further includes: Obtain the indoor-outdoor humidity difference value ΔH, and compare ΔH with a first preset value a; If △H≤a, then the fresh air structure (2) is controlled to maintain a circulation state; If △H>a, then control the fresh air structure (2) to switch to fresh air state.

16. The control method according to claim 15, characterized in that, The fresh air structure (2) includes a fan (22), the speed of which is adjustable. If ΔH > a, the fresh air structure (2) is switched to a fresh air state. It also includes: Compare △H with the second preset value b and the third preset value c; If a < ΔH < b, then control the fan (22) to rotate at the first speed v1; If b≤△H≤c, then control the fan (22) to rotate at the second speed v2; If △H>c, then control the fan (22) to rotate at the third speed v3; Where a < b < c, v1 < v2 < v3.

17. An air conditioning unit, characterized in that, Includes the indoor unit component as described in any one of claims 1 to 11.

Images