Air conditioner indoor unit

Abstract

The present invention provides an air-conditioning indoor unit, which includes a casing and a fresh air device, wherein the fresh air device is installed in the casing to introduce outdoor fresh air into the room through the fresh air device; the fresh air device has a return air duct; wherein a return air port and an air-conditioning outlet are arranged on the casing, and the return air port is connected with the return air duct; the minimum distance between the return air port and the air-conditioning outlet is a synchronous return air distance, and the synchronous return air distance is less than or equal to a predetermined return air distance, so that the return air entering from the return air port and part of the air-conditioning air located at the air-conditioning outlet are introduced into the return air duct of the fresh air device together. Compared with the original return air temperature, the return air temperature formed after the return air entering from the return air port and part of the air-conditioning air located at the air-conditioning outlet merge in the return air duct is closer to the air-conditioning air temperature, so that the merged return air and the fresh air are subjected to heat exchange, so that the temperature of the fresh air entering the room can be made closer to the indoor temperature, thereby improving human comfort.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and in particular to an air conditioner indoor unit. Background Art

[0002] In recent years, due to the rapid economic development and accelerated urbanization, air pollution has become increasingly serious. The increase in PM2.5 concentration will directly lead to frequent haze weather, a substantial increase in toxic and harmful substances in fog, and other problems, which have seriously threatened human health. In this case, conventional household air conditioners can no longer meet people's needs, and health, comfort and environmental protection have become the goals of modern air conditioning development.

[0003] For ordinary air conditioners, in order to ensure its air conditioning effect, the air-conditioned room must be closed, resulting in an increase in indoor dust, smoke, bacteria, viruses, and exhaust gas, a decrease in oxygen content, and worsening air quality. In recent years, as "air-conditioning disease" has attracted increasing attention, people have been asked not to stay in air-conditioned rooms for a long time, and to improve the indoor environment by opening windows to let in fresh air or by exhausting indoor air to create negative pressure through the gaps of doors and windows to let in fresh air.

[0004] At present, air conditioner indoor units with fresh air structures have been launched on the market. However, existing air conditioner indoor units with fresh air structures have the following problems:

[0005] 1. Poor human comfort, that is, in summer, the human body will feel that the temperature of the fresh air blown out by the air conditioner is higher than the indoor temperature, and in winter, the human body will feel that the temperature of the fresh air blown out by the air conditioner is lower than the indoor temperature;

[0006] 2. High energy consumption and poor energy-saving effect;

[0007] 3. The introduction of fresh air results in poor cooling and heating effects of air conditioning. Summary of the invention

[0008] The main purpose of the present invention is to provide an air-conditioning indoor unit to solve the problem of poor human comfort of the air-conditioning indoor unit in the prior art.

[0009] In order to achieve the above-mentioned purpose, the present invention provides an air-conditioning indoor unit, which includes: a casing; a fresh air device, which is installed in the casing to introduce outdoor fresh air into the room through the fresh air device; the fresh air device has a return air channel; wherein a return air port and an air-conditioning outlet are provided on the casing, and the return air port is connected to the return air channel; the minimum distance between the return air port and the air-conditioning outlet is a synchronous return air distance, and the synchronous return air distance is less than or equal to a predetermined return air distance, so that the return air entering from the return air port and part of the air-conditioning air located at the air-conditioning outlet can be introduced into the return air channel of the fresh air device together.

[0010] Furthermore, the predetermined return air distance is half of the height of the return air outlet.

[0011] Furthermore, the return air vent is located above the air-conditioning outlet, and the synchronous return air distance is the minimum distance between the bottom end of the return air vent and the top end of the air-conditioning outlet.

[0012] Furthermore, the casing is provided with a fresh air outlet, which is located at the upper end of the casing; the fresh air device also has a fresh air channel, and the fresh air outlet is connected to the fresh air channel.

[0013] Furthermore, the fresh air outlet, the return air outlet and the air conditioning outlet are arranged in sequence along the height direction of the casing.

[0014] Furthermore, the return air inlet is arranged at the upper end of the casing, and the fresh air outlet is located above the return air inlet.

[0015] Furthermore, a fresh air inlet is provided on the casing, and the fresh air inlet is connected to both the outside and the fresh air passage to introduce outdoor fresh air into the fresh air passage; wherein, the fresh air inlet is located at the upper end of the casing.

[0016] Furthermore, the fresh air device includes: a fresh air fan, which is arranged in the fresh air channel so that outdoor fresh air enters the fresh air channel from the fresh air inlet; a heat exchanger, at least part of the fresh air channel and at least part of the return air channel are both located in the heat exchanger, and the part of the fresh air channel located in the heat exchanger and the part of the return air channel located in the heat exchanger are cross-arranged; wherein the heat exchanger is arranged at the upper end of the inner cavity of the casing, and the fresh air fan is located above the heat exchanger.

[0017] Furthermore, an exhaust port is provided on the casing, and the exhaust port is connected to both the outdoors and the return air duct so that the return air in the return air duct can be discharged through the exhaust port; wherein, the exhaust port is located at the upper end of the casing, and the fresh air inlet is located below the exhaust port.

[0018] Furthermore, the fresh air device includes an exhaust fan, and at least part of the return air outlet is arranged opposite to the exhaust fan, so that the return air entering from the return air outlet and part of the air-conditioning air located at the air-conditioning outlet enter the return air channel together under the action of the exhaust fan.

[0019] Furthermore, the exhaust fan has an air suction area, and the return air outlet and the air-conditioning outlet are both connected to the air suction area.

[0020] Furthermore, the fresh air device also has an air-conditioning wind introduction channel, which is arranged between the air-conditioning air outlet and the return air outlet, so that part of the air-conditioning wind at the air-conditioning air outlet enters the return air channel through the air-conditioning wind introduction channel in sequence.

[0021] By applying the technical solution of the present invention, the air-conditioning indoor unit comprises a casing and a fresh air device, wherein the fresh air device is installed in the casing so as to introduce outdoor fresh air into the room through the fresh air device; the fresh air device has a return air duct; wherein a return air port and an air-conditioning outlet are arranged on the casing, and the return air port is connected with the return air duct; the minimum distance between the return air port and the air-conditioning outlet is a synchronous return air distance, and the synchronous return air distance is less than or equal to a predetermined return air distance, so as to introduce the return air entering from the return air port and part of the air-conditioning air located at the air-conditioning outlet into the return air duct of the fresh air device together, and compared with the original return air temperature, the return air entering from the return air port and part of the air-conditioning air located at the air-conditioning outlet are cooled to a low temperature. The return air temperature formed after part of the conditioned air merges in the return air duct is closer to the conditioned air temperature, so that the merged return air and the fresh air can exchange heat, which can not only make the temperature of the fresh air entering the room closer to the indoor temperature and improve human comfort, thereby solving the problem of poor human comfort in the air-conditioning indoor unit in the prior art; it can also improve the heat exchange efficiency, which is helpful to reduce the energy consumption of the air-conditioning indoor unit itself and solve the problem of high energy consumption and poor energy-saving effect of the existing air-conditioning indoor unit; in addition, making the temperature of the fresh air closer to the indoor temperature also solves the problem of poor air-conditioning cooling and heating effects of the existing air-conditioning indoor unit due to the introduction of fresh air. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0023] Figure 1 A schematic structural diagram of an air-conditioning indoor unit according to an embodiment of the air-conditioning indoor unit of the present invention is shown;

[0024] Figure 2 Shows Figure 1 Schematic diagram of the air flow of return air and air conditioning air of the air conditioner indoor unit; and

[0025] Figure 3 Shows Figure 1 Schematic diagram of the fresh air flow of the air conditioner indoor unit.

[0026] The above drawings include the following reference numerals:

[0027] 10. Casing; 32. Fresh air outlet; 36. Fresh air inlet; 38. Fresh air fan; 31. Return air outlet; 37. Exhaust outlet; 39. Exhaust fan; 35. Heat exchanger; 20. Air conditioning outlet; 50. Evaporator; 60. Air conditioning fan; 70. Air conditioning air introduction channel; 71. Air inlet duct; 72. Exhaust duct. DETAILED DESCRIPTION

[0028] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0029] The present invention provides an air conditioner indoor unit, please refer to Figures 1 to 3 The air-conditioning indoor unit includes a casing 10 and a fresh air device, which is installed in the casing 10 to introduce outdoor fresh air into the room through the fresh air device; the fresh air device has a return air channel; wherein a return air port 31 and an air-conditioning outlet 20 are provided on the casing 10, and the return air port 31 is connected to the return air channel; the minimum distance between the return air port 31 and the air-conditioning outlet 20 is a synchronous return air distance, and the synchronous return air distance is less than or equal to a predetermined return air distance, so that the return air entering from the return air port 31 and part of the air-conditioning air located at the air-conditioning outlet 20 are introduced into the return air channel of the fresh air device together.

[0030] Under the cooling and fresh air conditions, the air-conditioning indoor unit delivers cold air from the air-conditioning outlet 20. At this time, the temperature of the air-conditioned air at the air-conditioning outlet 20 is lower than the indoor temperature. The return air entering from the return air outlet 31 and the part of the air-conditioned air located at the air-conditioning outlet 20 merge in the return air duct to form a return air temperature lower than the original return air temperature, that is, it is lower than the indoor air temperature. The heat exchange between the return air after the merger and the fresh air can make the temperature of the fresh air entering the room closer to the indoor temperature; under the heating and fresh air conditions, the air-conditioning indoor unit delivers hot air from the air-conditioning outlet 20. At this time, the temperature of the air-conditioned air at the air-conditioning outlet 20 is higher than the indoor temperature. The return air entering from the return air outlet 31 and the part of the air-conditioned air located at the air-conditioning outlet 20 merge in the return air duct to form a return air temperature higher than the original return air temperature. It is higher than the indoor air temperature. The heat exchange between the return air after the merger and the fresh air can make the temperature of the fresh air entering the room closer to the indoor temperature.

[0031] It can be seen that in the air-conditioning indoor unit of the present invention, the return air entering through the return air port 31 and part of the air-conditioning air located at the air-conditioning outlet 20 are introduced into the return air duct together. Compared with the original return air temperature, the return air temperature formed after the return air entering through the return air port 31 and part of the air-conditioning air located at the air-conditioning outlet 20 merge in the return air duct is closer to the air-conditioning air temperature, so that the merged return air and the fresh air are heat exchanged, which can not only make the temperature of the fresh air entering the room closer to the indoor temperature and improve human comfort, thereby solving the problem of poor human comfort in the air-conditioning indoor unit in the prior art; it can also improve the heat exchange efficiency, which is helpful to reduce the energy consumption of the air-conditioning indoor unit itself and solve the problem of high energy consumption and poor energy-saving effect of the existing air-conditioning indoor unit; in addition, making the temperature of the fresh air closer to the indoor temperature also solves the problem of poor air-conditioning cooling and heating effects of the existing air-conditioning indoor unit due to the introduction of fresh air.

[0032] According to the temperature exchange efficiency formula:

[0033]

[0034] When it is heating condition, the dirty air inlet temperature (return air temperature) t pj Increase, outdoor fresh air temperature t xj The temperature exchange efficiency η remains unchanged. wd unchanged, the fresh air outlet temperature t xc Increase.

[0035] During specific implementation, the predetermined return air distance is half of the height of the return air port 31 .

[0036] During the specific implementation, the return air outlet 31 is located above the air-conditioning outlet 20 , and the synchronous return air distance is the minimum distance between the bottom end of the return air outlet 31 and the top end of the air-conditioning outlet 20 .

[0037] In a specific implementation process, the housing 10 is further provided with a fresh air outlet 32, which is located at the upper end of the housing 10; the fresh air device further has a fresh air channel, and the fresh air outlet 32 ​​is connected to the fresh air channel to transport the fresh air in the fresh air channel to the room through the fresh air outlet 32. Optionally, the maximum distance between the hole center line of the fresh air outlet 32 ​​and the top of the housing 10 is less than or equal to one tenth of the height of the housing 10.

[0038] During the specific implementation process, the fresh air outlet 32 ​​, the return air outlet 31 and the air conditioning outlet 20 are arranged in sequence along the height direction of the casing 10 , and the fresh air outlet 32 ​​, the return air outlet 31 and the air conditioning outlet 20 are all located on the front panel of the casing 10 .

[0039] In the specific implementation process, the return air inlet 31 is arranged at the upper end of the housing 10, and the fresh air outlet 32 ​​is located above the return air inlet 31. Optionally, the distance between the hole center line of the return air inlet 31 and the hole center line of the fresh air outlet 32 ​​is greater than or equal to one tenth of the height of the housing 10.

[0040] In a specific implementation process, the housing 10 is further provided with a fresh air inlet 36, which is connected to both the outside and the fresh air passage to introduce outdoor fresh air into the fresh air passage; wherein the fresh air inlet 36 is located at the upper end of the housing 10. Optionally, the maximum distance between the hole center line of the fresh air inlet 36 and the top of the housing 10 is less than or equal to one tenth of the height of the housing 10.

[0041] In order to allow outdoor fresh air to enter the fresh air channel through the fresh air inlet 36, the fresh air device includes a fresh air fan 38, which is arranged in the fresh air channel to allow outdoor fresh air to enter the fresh air channel through the fresh air inlet 36. In order to achieve heat exchange between the merged return air and the fresh air, the fresh air device also includes a heat exchanger 35, at least part of the fresh air channel and at least part of the return air channel are both located in the heat exchanger 35, and part of the fresh air channel located in the heat exchanger 35 and part of the return air channel located in the heat exchanger 35 are cross-arranged, so that the fresh air in the part of the fresh air channel located in the heat exchanger 35 and the merged return air in the part of the return air channel located in the heat exchanger 35 can exchange heat.

[0042] During the specific implementation process, the fresh air channel includes a first fresh air section, a second fresh air section and a third fresh air section, and the third fresh air section is arranged between the first fresh air section and the second fresh air section; the two ends of the third fresh air section are respectively connected to the second end of the first fresh air section and the first end of the second fresh air section, the first end of the first fresh air section is connected to the fresh air inlet 36, and the second end of the second fresh air section is connected to the fresh air outlet 32; wherein, the first fresh air section and the second fresh air section both extend in a horizontal direction, and the third fresh air section is located in the heat exchanger 35.

[0043] The return air duct includes a first return air section, a second return air section and a third return air section, and the third return air section is arranged between the first return air section and the second return air section; the two ends of the third return air section are respectively connected to the second end of the first return air section and the first end of the second return air section, the first end of the first return air section is connected to the return air port 31, and the second return air section is connected to the exhaust port 37; wherein the first return air section and the second return air section both extend in a horizontal direction, and the third return air section is located in the heat exchanger 35 and is cross-arranged with the third fresh air section.

[0044] During the specific implementation, the heat exchanger 35 is disposed at the upper end of the inner cavity of the casing 10 , and the fresh air fan 38 is located above the heat exchanger 35 .

[0045] Specifically, the housing 10 is further provided with an exhaust port 37, which is connected to both the outside and the return air passage, so that the return air in the return air passage is discharged through the exhaust port 37; wherein the exhaust port 37 is located at the upper end of the housing 10, and the fresh air inlet 36 is located below the exhaust port 37. Optionally, the exhaust port 37 and the fresh air inlet 36 are both located on the rear panel of the housing 10.

[0046] Specifically, the fresh air device includes an exhaust fan 39, and at least a portion of the return air port 31 is arranged opposite to the exhaust fan 39, so that the return air entering from the return air port 31 and part of the air-conditioning air at the air-conditioning outlet 20 enter the return air channel together under the action of the exhaust fan 39. Optionally, the exhaust fan 39 is located at the upper end of the inner cavity of the housing 10 and below the heat exchanger 35.

[0047] During the specific implementation process, the exhaust fan 39 has an air suction area, and the return air outlet 31 and the air-conditioning outlet 20 are both connected to the air suction area, so that the return air in the air suction area and part of the air-conditioning air enter the return air channel together under the action of the exhaust fan 39.

[0048] In the specific implementation process, the fresh air device also has an air conditioning air introduction channel 70, which is arranged between the air conditioning outlet 20 and the return air outlet 31, so that part of the air conditioning air at the air conditioning outlet 20 enters the return air channel through the air conditioning air introduction channel 70 in sequence. That is, when the exhaust fan 39 is running, the air conditioning air introduction channel 70 forms a negative pressure, which can make part of the air conditioning air at the air conditioning outlet 20 enter the return air channel through the air conditioning air introduction channel 70.

[0049] During the specific implementation process, the air-conditioning indoor unit also includes an air-conditioning air inlet and an evaporator 50; the evaporator 50 is arranged in the casing 10, so that the indoor air enters the casing 10 from the air-conditioning air inlet, and after heat exchange through the evaporator 50, it is delivered to the room through the air-conditioning outlet 20; optionally, the evaporator 50 is arranged opposite to the air-conditioning outlet 20, and the side wall of the evaporator 50 is in contact with the inner wall of the rear panel of the casing 10.

[0050] During the specific implementation process, the air conditioner indoor unit also includes an air conditioner fan 60, which is arranged between the evaporator 50 and the air conditioner outlet 20, and is arranged opposite to the air conditioner outlet 20, so that indoor air enters the casing 10 from the air conditioner inlet.

[0051] During the specific implementation process, the air conditioner indoor unit also includes an air inlet duct 71, one end of which is connected to the fresh air inlet 36, and the other end of the air inlet duct 71 extends through the indoor wall to the outdoors to connect with the outdoors, and the outdoor fresh air enters the fresh air channel through the air inlet duct 71.

[0052] During the specific implementation process, the air conditioner indoor unit also includes an exhaust duct 72, one end of the exhaust duct 72 is connected to the exhaust port 37, and the other end of the exhaust duct 72 extends to the outside through the indoor wall to communicate with the outside, and the return air in the return air channel is discharged to the outside through the exhaust duct 72.

[0053] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0054] In the air-conditioning indoor unit of the present invention, the air-conditioning indoor unit includes a casing 10 and a fresh air device, the fresh air device is installed in the casing 10, so as to introduce outdoor fresh air into the room through the fresh air device; the fresh air device has a return air channel; wherein a return air port 31 and an air-conditioning outlet 20 are provided on the casing 10, and the return air port 31 is connected with the return air channel; the minimum distance between the return air port 31 and the air-conditioning outlet 20 is a synchronous return air distance, and the synchronous return air distance is less than or equal to a predetermined return air distance, so as to introduce the return air entering from the return air port 31 and part of the air-conditioning air located at the air-conditioning outlet 20 into the return air channel of the fresh air device together, and the return air temperature entering from the return air port 31 is lower than that of the original return air. The return air temperature formed after the return air and part of the air-conditioning air located at the air-conditioning outlet 20 merge in the return air duct is closer to the air-conditioning air temperature, so that the merged return air and fresh air can exchange heat, which can not only make the temperature of the fresh air entering the room closer to the indoor temperature and improve human comfort, thereby solving the problem of poor human comfort in the air-conditioning indoor unit in the prior art; it can also improve the heat exchange efficiency, which is helpful to reduce the energy consumption of the air-conditioning indoor unit itself and solve the problem of high energy consumption and poor energy-saving effect of the existing air-conditioning indoor unit; in addition, making the temperature of the fresh air closer to the indoor temperature also solves the problem of poor air-conditioning cooling and heating effects of the existing air-conditioning indoor unit due to the introduction of fresh air.

[0055] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0056] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0057] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0058] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An air conditioner indoor unit, characterized in that: include: Housing (10); A fresh air device, the fresh air device being installed in the casing (10) so as to introduce outdoor fresh air into the room through the fresh air device; The fresh air device has a return air channel; The housing (10) is provided with a return air port (31) and an air-conditioning outlet (20), and the return air port (31) is connected to the return air channel; The minimum distance between the return air port (31) and the air conditioning outlet (20) is a synchronous return air distance, and the synchronous return air distance is less than or equal to a predetermined return air distance, so that the return air entering from the return air port (31) and part of the air conditioning air at the air conditioning outlet (20) are introduced into the return air channel of the fresh air device; The predetermined return air distance is half of the height of the return air outlet (31); the return air outlet (31) is located above the air-conditioning outlet (20), and the synchronous return air distance is the minimum distance between the bottom end of the return air outlet (31) and the top end of the air-conditioning outlet (20); The fresh air device comprises: an exhaust fan (39), at least a portion of the return air port (31) being arranged opposite to the exhaust fan (39), so that the return air entering through the return air port (31) and a portion of the air-conditioning air at the air-conditioning outlet (20) enter the return air channel together under the action of the exhaust fan (39); The exhaust fan (39) has an air suction area, and the return air port (31) and the air conditioning air outlet (20) are both connected to the air suction area.

2. The air conditioner indoor unit according to claim 1, characterized in that: The casing (10) is also provided with a fresh air outlet (32), and the fresh air outlet (32) is located at the upper end of the casing (10); the fresh air device also has a fresh air channel, and the fresh air outlet (32) is connected to the fresh air channel.

3. The air conditioner indoor unit according to claim 2, characterized in that: The fresh air outlet (32), the return air outlet (31) and the air conditioning outlet (20) are arranged in sequence along the height direction of the casing (10).

4. The air conditioner indoor unit according to claim 3, characterized in that: The return air port (31) is arranged at the upper end of the casing (10), and the fresh air outlet (32) is located above the return air port (31).

5. The air conditioner indoor unit according to claim 2, characterized in that: The housing (10) is also provided with a fresh air inlet (36), the fresh air inlet (36) being connected to both the outside and the fresh air passage so as to introduce outdoor fresh air into the fresh air passage; Wherein, the fresh air inlet (36) is located at the upper end of the casing (10).

6. The air conditioner indoor unit according to claim 5, characterized in that: The fresh air device comprises: A fresh air fan (38), the fresh air fan (38) being arranged in the fresh air passage so that outdoor fresh air enters the fresh air passage through the fresh air inlet (36); a heat exchanger (35), wherein at least a portion of the fresh air channel and at least a portion of the return air channel are both located in the heat exchanger (35), and a portion of the fresh air channel located in the heat exchanger (35) and a portion of the return air channel located in the heat exchanger (35) are arranged crosswise; The heat exchanger (35) is arranged at the upper end of the inner cavity of the casing (10), and the fresh air blower (38) is located above the heat exchanger (35).

7. The air conditioner indoor unit according to claim 5, characterized in that: The housing (10) is also provided with an exhaust port (37), the exhaust port (37) being in communication with the outside and the return air passage, so that the return air in the return air passage is discharged through the exhaust port (37); The air outlet (37) is located at the upper end of the casing (10), and the fresh air inlet (36) is located below the air outlet (37).

8. The air conditioner indoor unit according to claim 1, characterized in that: The fresh air device also has an air conditioning air introduction channel (70), and the air conditioning air introduction channel (70) is arranged between the air conditioning air outlet (20) and the return air outlet (31), so that part of the air conditioning air located at the air conditioning air outlet (20) enters the return air channel in sequence through the air conditioning air introduction channel (70).

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