Indoor unit and air conditioning system with same

Abstract

The utility model relates to the technical field of air conditioners, in particular to an indoor unit and an air conditioning system with the indoor unit, and aims to solve the problem that an existing air conditioner cannot effectively filter fresh air or has large side effects although the fresh air can be filtered. In order to achieve the purpose, the indoor unit comprises a water tank and a fresh air pipe, and the water tank is used for containing water; one end of the fresh air pipe is connected outdoors, the other end of the fresh air pipe extends into the water tank, and air introduced into the indoor unit by the fresh air pipe is filtered by water in the water tank; fresh air entering the indoor unit is filtered by water in the water tank to ensure the cleanliness of the fresh air, and the fresh air is filtered before the indoor fan blows air into a room, so that a water curtain does not need to be arranged at the indoor unit again, it can be ensured that the air blown into the room does not contain water drops, and the experience feeling of a user is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioning, and specifically provides an indoor unit and an air conditioning system having the same. Background Art

[0002] With the development of society, air conditioners have become an essential appliance in homes and offices. The indoor unit of an air conditioner regulates the ambient temperature of the space it is in. However, when using an air conditioner, doors and windows must be closed to improve cooling and heating effects. Prolonged use of an air conditioner in a closed environment can lead to poor indoor air quality.

[0003] Existing solutions to improve indoor air quality include: 1. Adding a water curtain around the fan to absorb dust and germs, but the disadvantage is that the fan has a high blowing speed, which can easily blow water droplets into the air duct and then out of the air conditioner outlet, causing water blowing problems; 2. Using UVC lamps for sterilization can kill germs to a certain extent, but has no effect on dust filtering; 3. Using the fresh air function to bring fresh air from outdoors into the room, but it cannot filter out harmful substances in the outdoor air.

[0004] Therefore, there is an urgent need for an indoor unit and an air-conditioning system having the same to solve the above technical problems. Utility Model Content

[0005] The utility model aims to solve the above technical problems, that is, to solve the problem that existing air conditioners cannot effectively filter fresh air or can filter it but have significant side effects.

[0006] In a first aspect, the present invention provides an indoor unit, comprising:

[0007] a water tank for holding water;

[0008] One end of the fresh air duct is connected to the outside of the room, and the other end extends into the water tank. The air passing through the fresh air duct into the indoor unit is filtered by the water in the water tank.

[0009] In a specific embodiment of the above-mentioned indoor unit, a control valve is provided on the fresh air duct, and the control valve is used to control the air flow rate in the fresh air duct.

[0010] In a specific embodiment of the indoor unit, the indoor unit further includes a filter layer, which is disposed in the water tank and located above the air outlet of the fresh air duct.

[0011] In a specific embodiment of the indoor unit, the filter layer is immersed in water.

[0012] In a specific embodiment of the above indoor unit, the filter layer includes a filter mesh; or

[0013] The filter layer includes a microporous filter membrane.

[0014] In a specific embodiment of the above-mentioned indoor unit, a fresh air fan is further included, which is arranged on the fresh air duct or at the air inlet of the fresh air duct. The fresh air fan is used to drive outdoor fresh air into the room through the fresh air duct and the water tank.

[0015] In a specific embodiment of the indoor unit, the indoor unit further includes an indoor heat exchanger, the water tank is located below the indoor heat exchanger, and the condensed water generated by the indoor heat exchanger can flow into the water tank.

[0016] In a specific embodiment of the above-mentioned indoor unit, the indoor unit also includes a water receiving pan, which is arranged below the indoor heat exchanger and above the water tank. The water receiving pan is connected to a first drain pipe, which can drain the water in the water receiving pan into the water tank.

[0017] In a specific embodiment of the indoor unit, a second drain pipe is provided at the bottom of the water tank, a drain valve is provided on the second drain pipe, and the second drain pipe is used to drain the water in the water tank.

[0018] In a second aspect, the present invention provides an air-conditioning system, which includes the indoor unit described above.

[0019] When adopting the above technical solution, the indoor unit of the utility model includes a water tank and a fresh air duct, and the water tank is used to hold water; one end of the fresh air duct is connected to the outdoors, and the other end extends into the water tank, and the air entering the indoor unit through the fresh air duct is filtered by the water in the water tank; the fresh air entering the indoor unit can ensure its cleanliness after being filtered by the water in the water tank. Since it has been filtered before the indoor fan blows air into the room, there is no need to set a water curtain at the indoor unit again, which can ensure that the air blown into the room does not contain water droplets, thereby ensuring the user experience.

[0020] In addition, setting up a filter layer in the water tank can perform secondary filtration on the air and break up larger bubbles in the air into small bubbles, so that the fresh air can be effectively filtered.

[0021] The fresh air fan can make the fresh air have enough power to break through the resistance of the filtered water in the water tank, so that the filtered fresh air can enter the indoor unit; in order to provide fresh air for the indoor unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

[0023] Figure 1 It is a structural diagram of the indoor unit provided by the utility model;

[0024] Figure 2 This is a schematic diagram of the structure of the water tank and fresh air duct provided by the utility model Figure 1 ;

[0025] Figure 3 This is a schematic diagram of the structure of the water tank and fresh air duct provided by the utility model Figure 2 .

[0026] List of reference numerals: 1. water tank; 2. fresh air duct; 3. filter layer; 4. second drain pipe; 5. water collection tray; 6. first drain pipe; 7. indoor fan; 8. indoor heat exchanger. DETAILED DESCRIPTION

[0027] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0028] It should be noted that in the description of this utility model, terms such as "upper," "lower," "left," "right," "inner," and "outer" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is merely for ease of description and does not indicate or imply that the device or component described must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, it should not be understood as limiting the utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance.

[0029] Furthermore, it should be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "installed," "set," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0030] Existing solutions to improve indoor air quality include: 1. Adding a water curtain around the fan to absorb dust and germs, but the disadvantage is that the fan has a high blowing speed, which can easily blow water droplets into the air duct and then out of the air conditioner outlet, causing water blowing problems; 2. Using UVC lamps for sterilization can kill germs to a certain extent, but has no effect on dust filtering; 3. Using the fresh air function to bring fresh air from outdoors into the room, but it cannot filter out harmful substances in the outdoor air.

[0031] To solve the above technical problems, this embodiment discloses an air conditioning system, which includes an outdoor unit and an indoor unit, wherein the outdoor unit is provided with a compressor, an outdoor heat exchanger, an outdoor fan, a gas-liquid separator, and a four-way valve.

[0032] The indoor unit in this embodiment is specifically a cabinet-type indoor unit. Figure 1-3 As shown, the indoor unit includes a casing, a water tank 1, a fresh air duct 2, an indoor heat exchanger 8, an electronic expansion valve and an indoor fan 7, etc.

[0033] The indoor fan 7 is used to drive the indoor air into the outer shell and flow through the indoor heat exchanger 8. After heat exchange in the indoor heat exchanger 8, it is blown into the room to cool or heat the room. In addition, the indoor fan 7 also provides a certain amount of power for the fresh air in the fresh air duct 2 to enter the outer shell.

[0034] Among them, the suction port of the compressor is connected to the exhaust port of the gas-liquid separator, and the exhaust port of the compressor is connected to the first interface of the four-way valve; the inlet of the gas-liquid separator is connected to the second interface of the four-way valve; the outdoor heat exchanger, the electronic expansion valve and the indoor heat exchanger 8 are connected in sequence, and the side of the outdoor heat exchanger away from the electronic expansion valve is connected to the third interface of the four-way valve; the side of the indoor heat exchanger 8 away from the electronic expansion valve is connected to the fourth interface of the four-way valve.

[0035] In the cooling mode, the first interface and the third interface of the four-way valve are connected, and the second interface and the fourth interface are connected; the high-temperature and high-pressure refrigerant flowing out of the compressor flows through the four-way valve to the outdoor heat exchanger, releases heat in the outdoor heat exchanger, and turns the refrigerant into liquid refrigerant; the refrigerant flowing out of the outdoor heat exchanger flows to the indoor heat exchanger 8 after passing through the electronic expansion valve; the liquid refrigerant absorbs heat at the indoor heat exchanger 8 to achieve indoor cooling. The refrigerant flowing out of the indoor heat exchanger 8 flows to the gas-liquid separator after passing through the four-way valve, and the gaseous refrigerant will be discharged from the exhaust port of the gas-liquid separator to the compressor for the next cycle. Under the action of the gaseous refrigerant, the liquid refrigerant in the gas-liquid separator can absorb the heat in the gaseous refrigerant, causing it to vaporize, and then flow from the exhaust port to the compressor.

[0036] In the heating mode, the first interface and the fourth interface of the four-way valve are connected, and the second interface and the third interface are connected; the high-temperature and high-pressure refrigerant flowing out of the compressor flows through the four-way valve to the indoor heat exchanger 8, where it releases heat, turning the refrigerant into liquid refrigerant and heating the room; the refrigerant flowing out of the indoor heat exchanger 8 flows to the outdoor heat exchanger after passing through the electronic expansion valve; the liquid refrigerant absorbs heat at the outdoor heat exchanger to achieve vaporization. The refrigerant flowing out of the outdoor heat exchanger flows to the gas-liquid separator after passing through the four-way valve, and the gaseous refrigerant will be discharged from the exhaust port of the gas-liquid separator to the compressor for the next cycle. Under the action of the gaseous refrigerant, the liquid refrigerant in the gas-liquid separator can absorb the heat in the gaseous refrigerant, causing it to vaporize, and then flow from the exhaust port to the compressor.

[0037] In defrost mode, the system operates in heating mode before the defrost mode is activated, and in cooling mode after the defrost mode is activated. When operating in cooling mode, the indoor and outdoor fans 7 do not operate. The inoperative outdoor fan speeds up defrosting. Inoperative indoor fan 7 prevents the indoor temperature from dropping, ensuring a pleasant user experience.

[0038] The water tank 1 is arranged in the shell, and is specifically located at the bottom of the shell, and is used to contain water for purifying the air. The water tank 1 is specifically a sheet metal part, which is processed by a stamping process.

[0039] Reference Figure 2 and 3 A second drain pipe 4 is provided at the bottom of the water tank 1, and a drain valve is provided on the second drain pipe 4. The second drain pipe 4 is used to drain the water in the water tank 1. The drain valve is specifically a solenoid valve or an electric ball valve, and is communicatively connected to the control module of the air-conditioning system. The control module can control the opening of the drain valve, and further control whether the water tank 1 discharges water outward. A liquid level sensor is provided in the water tank 1, which is communicatively connected to the control module. When the liquid level detected by the liquid level sensor exceeds the preset liquid level, the control module opens the drain valve to discharge part of the water in the water tank 1, so that the liquid level is controlled below the preset liquid level. The bottom of the water tank 1 is tilted. Specifically, the position of the second drain pipe 4 is set to the lowest point, so that the water in the water tank 1 can quickly flow to the second drain pipe 4 for discharge, and it can ensure that there is no residue in the water tank 1.

[0040] Furthermore, a turbidity sensor is installed within water tank 1 to monitor the water's cleanliness. This is determined by measuring turbidity. If the turbidity exceeds a preset value, it indicates that the water is dirty and needs to be replaced to ensure effective purification of the fresh air. If the turbidity sensor detects a turbidity exceeding a preset value, the control module activates the drain valve to drain the dirty water from water tank 1 and replenish clean water. Furthermore, if the turbidity sensor detects a turbidity exceeding a preset value, the air conditioning system issues an alarm, prompting the user to replace the water in water tank 1 to ensure the cleanliness of the fresh air filtration.

[0041] One end of the fresh air duct 2 is connected to the outdoors, and the other end extends into the water tank 1. The fresh air entering the indoor unit through the fresh air duct 2 is filtered through the water in the water tank 1. A filter element or filter screen is installed at the air inlet of the fresh air duct 2 to perform a primary filtration on the fresh air entering the fresh air duct 2, filtering out larger impurities in the fresh air outdoors and preventing them from entering the water tank 1. This ensures that the amount of air that can be filtered through the water in the water tank 1 is increased, avoiding the need for frequent water changes. Furthermore, larger impurities in the fresh air cannot enter the water tank 1, which also ensures that the second drain pipe 4 of the water tank 1 is not blocked during use. The second drain pipe 4 extends directly to the outdoors, allowing the wastewater generated by the filtration to be directly discharged outdoors through the pipe.

[0042] A control valve is provided on the fresh air duct 2, and the control valve is used to control the air flow rate in the fresh air duct 2; wherein, the control valve is specifically a solenoid valve or an electric ball valve, which is connected to the control module of the air-conditioning system, and the control module controls its opening; when no fresh air is needed, the control valve is controlled to be closed; when the required amount of fresh air is small, the control valve can be kept at a smaller opening; when the required amount of fresh air is large, the control valve can be kept at a larger opening, or even fully open.

[0043] In addition, since the indoor fan 7 is mainly used to blow air indoors, its wind force is relatively low. Moreover, the fresh air in this application needs to be filtered by water, and the resistance to fresh air flowing to the indoor unit after water filtration is relatively large. Therefore, relying solely on the wind force of the indoor fan 7 may not allow sufficient fresh air to enter the indoor unit. Therefore, the indoor unit also includes a fresh air fan, which can be specifically arranged on the fresh air duct 2, for passing the outdoor fresh air into the water tank 1 for filtration, and can ensure that the fresh air has sufficient power to break through the resistance of the filtered water in the water tank 1, so that the filtered fresh air can enter the indoor unit.

[0044] Regarding the installation location of the fresh air blower, it should be noted that although it is installed on the fresh air duct 2 in this embodiment, this is not a limitation of the present invention. Without departing from the principles of the present invention, in other embodiments, the fresh air blower can also be installed at the air inlet of the fresh air duct 2. This also allows the fresh air to enter the water tank 1 for filtration and enter the indoor unit. This does not deviate from the basic principles of the present invention and falls within the scope of protection of the present invention.

[0045] The indoor unit also includes a filter layer 3, which is disposed within the water tank 1. The filter layer 3 is located above the air outlet of the fresh air duct 2 and is immersed in the water, that is, the filter layer 3 is located below the water surface. This allows the fresh air to be filtered through the filter screen simultaneously with the water, ensuring that impurities with lower density in the fresh air are also filtered into the water. Furthermore, when fresh air enters the water tank 1, large bubbles are generated, preventing some of the fresh air from being effectively filtered. The installation of the filter layer 3 breaks up these large bubbles into smaller ones, ensuring that all of the fresh air is effectively filtered.

[0046] The filter layer 3 in this embodiment includes a support frame and a filter screen mounted on the support frame. The support frame is fixed within the water tank 1, allowing the filter screen to be immersed in water. The mesh size of the filter screen is determined based on the specific filtering requirements. In locations with high filtering requirements or poor outdoor air quality, a larger mesh size is recommended. In locations with lower filtering requirements or good outdoor air quality, a lower mesh size is sufficient; this also reduces resistance to fresh air.

[0047] It should be noted that regarding the filter layer 3, although the filter layer 3 in this embodiment includes a filter mesh, this is not a limitation of the present invention. Without departing from the principles of the present invention, in other embodiments, those skilled in the art may choose to have the filter layer 3 include a microporous filter membrane; its filtration accuracy is higher, and it is more suitable for places with higher requirements on air quality, such as precision instrument production workshops and hospitals, and can achieve high-precision filtration of fresh air. This does not deviate from the basic principles of the present invention and will fall within the scope of protection of the present invention.

[0048] Continue to refer to Figure 1 The indoor unit also includes a water receiving pan 5, which is arranged below the indoor heat exchanger 8 and above the water tank 1. The indoor heat exchanger 8 will produce condensed water during cooling, which will drip into the water receiving pan 5.

[0049] The water receiving pan 5 is connected to a first drain pipe 6, which can drain the water in the water receiving pan 5 into the sink 1. The bottom of the water receiving pan 5 is tilted, and the connection point of the first drain pipe 6 is the lowest point, so that the water in the water receiving pan 5 can be quickly drained into the first drain pipe 6, so that the first drain pipe 6 can drain the condensed water into the sink 1.

[0050] Although the indoor unit in this embodiment is a vertical cabinet unit, this is not a limitation of the present invention. Without departing from the principles of the present invention, in other embodiments, the indoor unit can also be a wall-mounted unit, in which the water tank 1 is also located below the water tray 5 and at the bottom of the housing. This can also filter the fresh air and collect condensed water. This does not deviate from the basic principles of the present invention and falls within the scope of protection of the present invention.

[0051] To solve the above technical problems, this embodiment discloses an air conditioning system, which includes an outdoor unit and an indoor unit, wherein the outdoor unit is provided with a compressor, an outdoor heat exchanger, an outdoor fan, a gas-liquid separator, and a four-way valve.

[0052] The indoor unit in this embodiment is a cabinet-type indoor unit, which includes a housing, a water tank 1, a fresh air duct 2, an indoor heat exchanger 8, an electronic expansion valve, and an indoor fan 7.

[0053] The indoor fan 7 is used to drive the indoor air into the outer shell and flow through the indoor heat exchanger 8. After heat exchange in the indoor heat exchanger 8, it is blown into the room to cool or heat the room. In addition, the indoor fan 7 also provides a certain amount of power for the fresh air in the fresh air duct 2 to enter the outer shell.

[0054] Among them, the suction port of the compressor is connected to the exhaust port of the gas-liquid separator, and the exhaust port of the compressor is connected to the first interface of the four-way valve; the inlet of the gas-liquid separator is connected to the second interface of the four-way valve; the outdoor heat exchanger, the electronic expansion valve and the indoor heat exchanger 8 are connected in sequence, and the side of the outdoor heat exchanger away from the electronic expansion valve is connected to the third interface of the four-way valve; the side of the indoor heat exchanger 8 away from the electronic expansion valve is connected to the fourth interface of the four-way valve.

[0055] In the cooling mode, the first interface and the third interface of the four-way valve are connected, and the second interface and the fourth interface are connected; the high-temperature and high-pressure refrigerant flowing out of the compressor flows through the four-way valve to the outdoor heat exchanger, releases heat in the outdoor heat exchanger, and turns the refrigerant into liquid refrigerant; the refrigerant flowing out of the outdoor heat exchanger flows to the indoor heat exchanger 8 after passing through the electronic expansion valve; the liquid refrigerant absorbs heat at the indoor heat exchanger 8 to achieve indoor cooling. The refrigerant flowing out of the indoor heat exchanger 8 flows to the gas-liquid separator after passing through the four-way valve, and the gaseous refrigerant will be discharged from the exhaust port of the gas-liquid separator to the compressor for the next cycle. Under the action of the gaseous refrigerant, the liquid refrigerant in the gas-liquid separator can absorb the heat in the gaseous refrigerant, causing it to vaporize, and then flow from the exhaust port to the compressor.

[0056] In the heating mode, the first interface and the fourth interface of the four-way valve are connected, and the second interface and the third interface are connected; the high-temperature and high-pressure refrigerant flowing out of the compressor flows through the four-way valve to the indoor heat exchanger 8, where it releases heat, turning the refrigerant into liquid refrigerant and heating the room; the refrigerant flowing out of the indoor heat exchanger 8 flows to the outdoor heat exchanger after passing through the electronic expansion valve; the liquid refrigerant absorbs heat at the outdoor heat exchanger to achieve vaporization. The refrigerant flowing out of the outdoor heat exchanger flows to the gas-liquid separator after passing through the four-way valve, and the gaseous refrigerant will be discharged from the exhaust port of the gas-liquid separator to the compressor for the next cycle. Under the action of the gaseous refrigerant, the liquid refrigerant in the gas-liquid separator can absorb the heat in the gaseous refrigerant, causing it to vaporize, and then flow from the exhaust port to the compressor.

[0057] In defrost mode, the system operates in heating mode before the defrost mode is activated, and in cooling mode after the defrost mode is activated. When operating in cooling mode, the indoor and outdoor fans 7 do not operate. The inoperative outdoor fan speeds up defrosting. Inoperative indoor fan 7 prevents the indoor temperature from dropping, ensuring a pleasant user experience.

[0058] The water tank 1 is arranged in the shell, and is specifically located at the bottom of the shell, and is used to contain water for purifying the air. The water tank 1 is specifically a sheet metal part, which is processed by a stamping process.

[0059] A second drain pipe 4 is provided at the bottom of the water tank 1. A drain valve is provided on the second drain pipe 4. The second drain pipe 4 is used to drain the water in the water tank 1. The drain valve is specifically a solenoid valve or an electric ball valve, and is communicatively connected to the control module of the air-conditioning system. The control module can control the opening of the drain valve, and further control whether the water tank 1 discharges water outward. A liquid level sensor is provided in the water tank 1, and is communicatively connected to the control module. When the liquid level detected by the liquid level sensor exceeds a preset liquid level, the control module opens the drain valve to discharge a portion of the water in the water tank 1, so that the liquid level is controlled below the preset liquid level. The bottom of the water tank 1 is tilted. Specifically, the position of the second drain pipe 4 is set to the lowest point, so that the water in the water tank 1 can quickly flow into the second drain pipe 4 for discharge, and it can be ensured that there is no residue in the water tank 1.

[0060] Furthermore, a turbidity sensor is installed within water tank 1 to monitor the water's cleanliness. This is determined by measuring turbidity. If the turbidity exceeds a preset value, it indicates that the water is dirty and needs to be replaced to ensure effective purification of the fresh air. If the turbidity sensor detects a turbidity exceeding a preset value, the control module activates the drain valve to drain the dirty water from water tank 1 and replenish clean water. Furthermore, if the turbidity sensor detects a turbidity exceeding a preset value, the air conditioning system issues an alarm, prompting the user to replace the water in water tank 1 to ensure the cleanliness of the fresh air filtration.

[0061] One end of the fresh air duct 2 is connected to the outdoors, and the other end extends into the water tank 1. The fresh air entering the indoor unit through the fresh air duct 2 is filtered through the water in the water tank 1. A filter element or filter screen is installed at the air inlet of the fresh air duct 2 to perform a primary filtration on the fresh air entering the fresh air duct 2, filtering out larger impurities in the fresh air outdoors and preventing them from entering the water tank 1. This ensures that the amount of air that can be filtered through the water in the water tank 1 is increased, avoiding the need for frequent water changes. Furthermore, larger impurities in the fresh air cannot enter the water tank 1, which also ensures that the second drain pipe 4 of the water tank 1 is not blocked during use. The second drain pipe 4 extends directly to the outdoors, allowing the wastewater generated by the filtration to be directly discharged outdoors through the pipe.

[0062] A control valve is provided on the fresh air duct 2, and the control valve is used to control the air flow rate in the fresh air duct 2; wherein, the control valve is specifically a solenoid valve or an electric ball valve, which is connected to the control module of the air-conditioning system, and the control module controls its opening; when no fresh air is needed, the control valve is controlled to be closed; when the required amount of fresh air is small, the control valve can be kept at a smaller opening; when the required amount of fresh air is large, the control valve can be kept at a larger opening, or even fully open.

[0063] In addition, since the indoor fan 7 is mainly used to blow air indoors, its wind force is relatively low. Moreover, the fresh air in this application needs to be filtered by water, and the resistance to fresh air flowing to the indoor unit after water filtration is relatively large. Therefore, relying solely on the wind force of the indoor fan 7 may not allow sufficient fresh air to enter the indoor unit. Therefore, the indoor unit also includes a fresh air fan, which can be specifically arranged on the fresh air duct 2, for passing the outdoor fresh air into the water tank 1 for filtration, and can ensure that the fresh air has sufficient power to break through the resistance of the filtered water in the water tank 1, so that the filtered fresh air can enter the indoor unit.

[0064] Regarding the installation location of the fresh air blower, it should be noted that although it is installed on the fresh air duct 2 in this embodiment, this is not a limitation of the present invention. Without departing from the principles of the present invention, in other embodiments, the fresh air blower can also be installed at the air inlet of the fresh air duct 2. This also allows the fresh air to enter the water tank 1 for filtration and enter the indoor unit. This does not deviate from the basic principles of the present invention and falls within the scope of protection of the present invention.

[0065] The indoor unit also includes a filter layer 3, which is disposed within the water tank 1. The filter layer 3 is located above the air outlet of the fresh air duct 2 and is immersed in the water, that is, the filter layer 3 is located below the water surface. This allows the fresh air to be filtered through the filter screen simultaneously with the water, ensuring that impurities with lower density in the fresh air are also filtered into the water. Furthermore, when fresh air enters the water tank 1, large bubbles are generated, preventing some of the fresh air from being effectively filtered. The installation of the filter layer 3 breaks up these large bubbles into smaller ones, ensuring that all of the fresh air is effectively filtered.

[0066] The filter layer 3 in this embodiment includes a support frame and a filter screen mounted on the support frame. The support frame is fixed within the water tank 1, allowing the filter screen to be immersed in water. The mesh size of the filter screen is determined based on the specific filtering requirements. In locations with high filtering requirements or poor outdoor air quality, a larger mesh size is recommended. In locations with lower filtering requirements or good outdoor air quality, a lower mesh size is sufficient; this also reduces resistance to fresh air.

[0067] It should be noted that regarding the filter layer 3, although the filter layer 3 in this embodiment includes a filter mesh, this is not a limitation of the present invention. Without departing from the principles of the present invention, in other embodiments, those skilled in the art may choose to have the filter layer 3 include a microporous filter membrane; its filtration accuracy is higher, and it is more suitable for places with higher requirements on air quality, such as precision instrument production workshops and hospitals, and can achieve high-precision filtration of fresh air. This does not deviate from the basic principles of the present invention and will fall within the scope of protection of the present invention.

[0068] The indoor unit further includes a water receiving pan 5 , which is disposed below the indoor heat exchanger 8 and above the water tank 1 . The indoor heat exchanger 8 generates condensed water during cooling, which drips into the water receiving pan 5 .

[0069] The water receiving pan 5 is connected to a first drain pipe 6, which can drain the water in the water receiving pan 5 into the sink 1. The bottom of the water receiving pan 5 is tilted, and the connection point of the first drain pipe 6 is the lowest point, so that the water in the water receiving pan 5 can be quickly drained into the first drain pipe 6, so that the first drain pipe 6 can drain the condensed water into the sink 1.

[0070] Although the indoor unit in this embodiment is a vertical cabinet unit, this is not a limitation of the present invention. Without departing from the principles of the present invention, in other embodiments, the indoor unit can also be a wall-mounted unit, in which the water tank 1 is also located below the water tray 5 and at the bottom of the housing. This can also filter the fresh air and collect condensed water. This does not deviate from the basic principles of the present invention and falls within the scope of protection of the present invention.

[0071] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

Claims

1. An indoor unit, characterized in that: It includes: a water tank (1) for containing water; One end of the fresh air pipe (2) is connected to the outside of the room, and the other end extends into the water tank (1). The air passing through the fresh air pipe (2) into the indoor unit is filtered by the water in the water tank (1).

2. The indoor unit according to claim 1, characterized in that: The fresh air duct (2) is provided with a control valve, and the control valve is used to control the air flow rate in the fresh air duct (2).

3. The indoor unit according to claim 1, wherein: The indoor unit further comprises a filter layer (3), which is arranged in the water tank (1) and located above the air outlet of the fresh air duct (2).

4. The indoor unit according to claim 3, characterized in that: The filter layer (3) is immersed in water.

5. The indoor unit according to claim 3, characterized in that: The filter layer (3) comprises a filter screen; or The filter layer (3) comprises a microporous filter membrane.

6. The indoor unit according to claim 1, characterized in that: It also includes a fresh air fan, which is arranged on the fresh air pipe (2) or at the air inlet of the fresh air pipe (2), and is used to drive outdoor fresh air into the room through the fresh air pipe (2) and the water tank (1).

7. The indoor unit according to any one of claims 1 to 6, characterized in that: The indoor unit further comprises an indoor heat exchanger (8), the water tank (1) is located below the indoor heat exchanger (8), and the condensed water generated by the indoor heat exchanger (8) can flow into the water tank (1).

8. The indoor unit according to claim 7, characterized in that: The indoor unit further comprises a water receiving pan (5), which is arranged below the indoor heat exchanger (8) and above the water tank (1); the water receiving pan (5) is connected to a first drain pipe (6), and the first drain pipe (6) can drain the water in the water receiving pan (5) into the water tank (1).

9. The indoor unit according to claim 1, wherein: A second drain pipe (4) is provided at the bottom of the water tank (1), a drain valve is provided on the second drain pipe (4), and the second drain pipe (4) is used to drain the water in the water tank (1).

10. An air conditioning system, characterized in that: It includes the indoor unit according to any one of claims 1 to 9.

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