WO2022160834A1

WO2022160834A1 - Indoor unit of floor air conditioner

Info

Publication number: WO2022160834A1
Application number: PCT/CN2021/127651
Authority: WO
Inventors: 辛涛; 郝本华; 樊明敬; 曹高华; 李国行
Original assignee: 青岛海尔空调器有限总公司; 青岛海尔空调电子有限公司; 海尔智家股份有限公司
Priority date: 2021-01-29
Filing date: 2021-10-29
Publication date: 2022-08-04
Also published as: CN112728643A

Abstract

An indoor unit (100) of a floor air conditioner. The indoor unit comprises: a housing (110), wherein a cavity is defined inside the housing, a first air inlet (113) and a second air inlet (114) are provided, from top to bottom, in the rear side of the housing (110), a first air outlet (115) and a second air outlet (116) are provided, from top to bottom, in the front side of the housing (110), and the first air inlet (113) is configured to make air, in an indoor environment where the indoor unit (100) of a floor air conditioner is located, enter the cavity; a main body portion, which is arranged in the cavity and is configured to exchange heat of air entering the cavity from the first air inlet (113) and blow out the heat-exchanged air by means of the first air outlet (115); and a fresh air system (200), which is arranged below the main body portion and is configured to make air in an outdoor environment enter the cavity and be blown out by means of the second air outlet (116).

Description

Vertical air conditioner indoor unit

technical field

The invention relates to the technical field of household appliances, in particular to an indoor unit of a vertical air conditioner.

Background technique

With the development of society and the continuous improvement of people's living standards, various air conditioning devices have become one of the indispensable electrical equipment in people's daily life. Various air conditioning devices can help people reach a temperature that they can adapt to when the ambient temperature is too high or too low.

The current air conditioning adjustment device mainly includes various types of air conditioners and fans, and the air conditioners can be divided into vertical, wall-mounted, ceiling-mounted and the like according to different setting methods. Among them, vertical air conditioners are mainly used in large living rooms, schools, hospitals and other public places, and these places are places for activities with a high density of people. For these closed places, due to personnel activities, various particulate pollutants, such as dust, PM2.5, etc., will be doped. The pollutants staying in the air conditioner will affect its service life, and the air quality cannot be improved by blowing it indoors. , affecting user comfort.

Existing air conditioners without fresh air systems tend to cause turbid indoor air and degrade air quality due to long-term operation. Air conditioners with fresh air systems often supply fresh air independently, and the location of the fresh air holes is low, making it difficult to send fresh air into the entire user room.

SUMMARY OF THE INVENTION

One purpose of the present invention is to solve the problem of air pollution in the indoor environment and improve the air supply quality of the air conditioner.

A further object of the present invention is to increase the air output while avoiding direct blowing, thereby improving the user experience.

In particular, the present invention provides an indoor unit for a vertical air conditioner, comprising: a casing, the interior of which defines a cavity, and the rear side of the casing is provided with a first air inlet and a second air inlet from top to bottom, the casing The front side of the body is provided with a first air outlet and a second air outlet from top to bottom, wherein the first air inlet is configured to allow the air of the indoor environment where the indoor unit of the vertical air conditioner is located to enter the cavity; the main body is arranged in the cavity. , configured to exchange heat for the air entering the cavity from the first air inlet, and blow the heat-exchanged air out through the first air outlet; and a fresh air system, arranged below the main body, configured to allow the air of the outdoor environment to enter cavity, and blow out through the second air outlet.

Optionally, the fresh air system includes: a centrifugal fan, the rotation axis of the impeller is a vertical direction; an air duct is arranged below the centrifugal fan, and an accommodating cavity communicated with the inlet of the centrifugal fan is defined inside.

Optionally, the air duct includes a front air duct panel and a rear air duct panel, and the rear air duct panel is provided with a fresh air inlet.

Optionally, the front air duct plate and the rear air duct plate are fixed by clips and screws, and the centrifugal fan is fixed to the air duct by screws.

Optionally, the fresh air system further includes: an air inlet pipe assembly configured to pass through the second air inlet to be connected to the fresh air inlet, so that the air in the outdoor environment can enter the accommodating cavity.

Optionally, the air inlet pipeline assembly includes: a fresh air duct, one end of which is clamped to the fresh air inlet; a fixing collar configured to fix the other end of the fresh air duct to a wall of the indoor environment; and an air inlet protection duct, It is connected with the fixed collar and is configured so that foreign objects or rainwater in the air in the outdoor environment will not enter the accommodating cavity.

Optionally, the fresh air system further includes: a dust filter screen disposed in the accommodating cavity and configured to filter the air entering the outdoor environment of the accommodating cavity.

Optionally, the fresh air system further includes: an air outlet protection structure, which is fixedly connected with the outlet of the centrifugal fan, and a protective net is arranged in the clip groove of the air outlet protection structure.

Optionally, the air outlet direction at the second air outlet is obliquely upward, so as to be mixed with the air blown from the first air outlet.

Optionally, the main body includes: a heat exchanger configured to exchange heat with the air entering the cavity through the first air inlet; and a fan configured to blow the heat-exchanged air out through the first air outlet.

The vertical air conditioner indoor unit of the present invention comprises: a casing, the interior of which defines a cavity, the rear side of the casing is provided with a first air inlet and a second air inlet from top to bottom, and the front side of the casing is from top to bottom. A first air outlet and a second air outlet are opened downward, wherein the first air inlet is configured to allow the air of the indoor environment where the indoor unit of the vertical air conditioner is located to enter the cavity; An air inlet enters the cavity for heat exchange, and the heat-exchanged air is blown out through the first air outlet; and a fresh air system is arranged below the main body and is configured to allow the air from the outdoor environment to enter the cavity and pass through the first air outlet. The second air outlet blows out. The traditional air outlet is realized through the main body, and the fresh air function is realized through the fresh air system, which effectively solves the problem of indoor air pollution, improves the air supply quality of the air conditioner, efficiently purifies the air sent to the room, and improves the user comfort.

Further, in the indoor unit of the vertical air conditioner of the present invention, the fresh air system includes: a centrifugal fan, the rotation axis of the impeller is a vertical direction, and the lower part of the centrifugal fan can enter the air and the front part discharges the air, so as to avoid setting additional structures to change the wind direction. , effectively simplify the air supply structure and reduce the occupied volume. The air inlet protection pipe is configured so that foreign objects or rainwater in the air in the outdoor environment will not enter the accommodating cavity; the dust filter is configured to filter the air in the outdoor environment entering the accommodating cavity, which can further improve the air supply quality. The direction of the air at the second air outlet is obliquely upward, so as to be mixed with the air blown from the first air outlet, so as to increase the air output and avoid direct blowing, thereby improving the user experience.

The above and other objects, advantages and features of the present invention will be more apparent to those skilled in the art from the following detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings.

Description of drawings

Hereinafter, some specific embodiments of the present invention will be described in detail by way of example and not limitation with reference to the accompanying drawings. The same reference numbers in the figures designate the same or similar parts or parts. It will be understood by those skilled in the art that the drawings are not necessarily to scale. In the attached picture:

1 is a schematic front view of a vertical air conditioner indoor unit according to an embodiment of the present invention;

Fig. 2 is a side structural schematic diagram of an indoor unit of a vertical air conditioner according to an embodiment of the present invention;

3 is a schematic diagram of the overall structure of a fresh air system in an indoor unit of a vertical air conditioner according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of the overall structure of the fresh air system from another perspective in FIG. 3; and

FIG. 5 is an exploded schematic diagram of a part of the structure of the fresh air system in FIG. 3 .

Detailed ways

The present embodiment provides an indoor unit of a vertical air conditioner, which can double purify the air and effectively improve the indoor air quality. 1 is a schematic diagram of the front structure of a vertical air conditioner indoor unit 100 according to an embodiment of the present invention, FIG. 2 is a schematic diagram of a side structure of the indoor unit 100 of a vertical air conditioner according to an embodiment of the present invention, and FIG. 3 is a schematic diagram of the structure according to the present invention A schematic diagram of the overall structure of the fresh air system 200 in the indoor unit 100 of a vertical air conditioner according to an embodiment, FIG. 4 is a schematic diagram of the overall structure of the fresh air system 200 in FIG. 3 from another perspective, and FIG. 5 is a partial structural decomposition of the fresh air system 200 in FIG. 3 . Schematic. As shown in FIGS. 1 to 5 , the indoor unit 100 of a standing air conditioner may generally include: a casing 110 , a main body (not shown in the drawings), and a fresh air system 200 .

The interior of the housing 110 defines a cavity, the rear side of the housing 110 is provided with a first air inlet 113 and a second air inlet 114 from top to bottom, and the front side of the housing 110 is provided with a first outlet from top to bottom. The air outlet 115 and the second air outlet 116, wherein the first air inlet 113 is configured to allow the air of the indoor environment where the indoor unit 100 of the vertical air conditioner is located to enter the cavity. For example, if the indoor unit 100 of the standing air conditioner is installed in a living room, the first air inlet 113 may be configured to allow air in the living room to enter the cavity.

In a specific embodiment, the casing 110 may be in the shape of a rectangular parallelepiped as a whole, and the casing 110 may include a front panel 111 and a rear panel 112 . The upper part of the front panel 111 is provided with a first air outlet 115 , and the lower part of the front panel 111 is provided with a first air outlet 115 . There is a second air outlet 116 . A first air inlet 113 is opened in the upper part of the rear panel 112 . The first air inlet 113 can be set in the form of an air inlet grille, which can suck the air in the indoor environment into the cavity through different directions and have a certain coarse filtering effect. The lower portion of the rear panel 112 may be provided with a second air inlet 114, and the second air inlet 114 may be in the shape of a circular hole.

In addition, the housing 110 may further include a top cover and a base, wherein the top cover may be covered on the top of the front panel 111 and the rear case 112 , and the base may be provided at the bottom of the front panel 111 and the rear case 112 . The top cover and the base can effectively improve the overall aesthetics of the indoor unit 100 of the vertical air conditioner.

The main body is disposed in the cavity and configured to exchange heat with the air entering the cavity through the first air inlet 113 , and blow the heat-exchanged air out through the first air outlet 115 . As mentioned above, the first air inlet 113 is configured to allow the air of the indoor environment where the vertical air conditioner indoor unit 100 is located to enter the cavity. Then the main body exchanges heat and blows out the air entering the indoor environment of the cavity.

The body portion may generally include: a heat exchanger and a fan. The heat exchanger is configured to exchange heat for the air entering the cavity through the first air inlet 113 . The fan may be configured to blow the heat-exchanged air out through the first air outlet 115 . The shape of the heat exchanger can be matched with the first air inlet 113, so that all the air passing through the first air inlet 113 enters the heat exchanger for heat exchange, and the air passing through the heat exchanger is blown out by the fan through the first air outlet 115. . The fans can be set to various types according to the actual situation, such as centrifugal fans, axial fans, and cross-flow fans. In a preferred embodiment, the fan is a cross-flow fan, which is also matched with the first air outlet 115, which can effectively improve the air output volume and air output efficiency.

The indoor unit 100 of the vertical air conditioner may further include: an air deflector (not shown in the figure) configured to open and close the first air outlet 115 in a controlled manner. Generally, when the indoor unit 100 of the vertical air conditioner is in a shutdown state, the air deflector closes the first air outlet 115 to prevent pollutants in the indoor ambient air from entering the interior of the casing 110 through the first air outlet 115 . When the vertical air conditioner indoor unit 100 is turned on, the air deflector opens the first air outlet 115 , so that the air processed inside the vertical air conditioner indoor unit 100 is sent indoors through the first air outlet 115 . Treated air refers to the indoor ambient air that enters the cavity and is blown out by heat exchangers and fans. More preferably, a filter element may also be provided here, so as to ensure that the air sent into the room through the first air outlet 115 meets the health needs of the user.

The fresh air system 200 may be disposed below the main body portion, and is configured to allow the air of the outdoor environment to enter the cavity, and to be blown out through the second air outlet 116 after heat exchange. That is to say, the main body processes the indoor ambient air entering the cavity, while the fresh air system 200 processes the outdoor ambient air entering the cavity. The combination of the two can effectively solve the problem of indoor air pollution, improve the air supply quality of the air conditioner, efficiently purify the air sent to the room, and improve user comfort.

Specifically, the fresh air system 200 realizes the fresh air function, and can provide fresh air to the room without opening the windows to change the air. You can enjoy the fresh air of nature without opening windows, meet the health needs of the human body, and reduce energy loss. It can also effectively remove mildew and odor, discharge indoor humid and dirty air, eradicate odor, prevent mold and bacteria from breeding, and prolong the service life of buildings and furniture. It also helps to reduce noise pollution, without having to endure the distraction of open window belts, making the room quieter and more comfortable. It can also expel harmful gases, effectively expel formaldehyde, oil fume odor, carbon dioxide, cigarette smell, bacteria, viruses and other unhealthy or harmful gases, which can prevent family members from being deeply endangered. Avoid opening windows to bring a lot of dust, effectively filter outdoor air, and ensure that the air entering the room is clean. The fresh air system 200 can reduce energy consumption while adjusting the room temperature. Avoiding opening windows can also avoid potential property and personal safety hazards that are easily caused by opening windows.

In a preferred embodiment, the air outlet direction at the second air outlet 116 is obliquely upward, so as to mix with the air blown out from the first air outlet 115 . In this way, through the upper and lower air outlets, the direct blowing can be avoided while increasing the air output, so that the user's health can be prevented from being affected by the direct blowing air, and the air outlet can be softened, which greatly improves the user's experience. In the structure of the traditional cabinet, making full use of the lower part of the space and adding the fresh air system 200 not only increases the air output of the indoor unit 100 of the vertical air conditioner, but also increases the air supply distance, and can effectively avoid direct blowing and improve the air supply. quality.

As shown in FIGS. 3 to 5 , the fresh air system 200 may include: a centrifugal fan 210 and an air duct 220 . The rotation axis of the impeller of the centrifugal fan 210 is a vertical direction. That is to say, it can be understood that the centrifugal fan 210 is placed horizontally in the cavity, the inlet 211 of the centrifugal fan 210 realizes the lower air intake, and the outlet 212 of the centrifugal fan 212 realizes the front air outlet. The centrifugal fan 210 may include a centrifugal fan and a motor, wherein the impeller of the centrifugal fan has a large diameter and a short length, and the outer periphery of the impeller is surrounded by a volute. The air enters from the center of the impeller, flows through the blades along the radial direction of the impeller, and is collected to the outlet 212 along the direction of the volute and discharged. Since the airflow is mainly centrifugal flow, it is called a centrifugal fan 210 . The wind pressure of the centrifugal fan 210 is larger than that of other types of fans, so it is beneficial for the air of the outdoor environment to enter the cavity.

The air duct 220 is disposed below the centrifugal fan 210 , and defines an accommodating cavity 221 in communication with the inlet 211 of the centrifugal fan 210 . It should be noted that the accommodating cavity 221 can be regarded as a part of the overall cavity, and is located at the lower part of the overall cavity. The air entering the outdoor environment of the accommodating cavity 221 enters the centrifugal fan 210 through the inlet 211 below the centrifugal fan 210 .

The air duct 220 may include a front air duct panel 222 and a rear air duct panel 223 , wherein the rear air duct panel 223 is provided with a fresh air inlet 224 . In a specific embodiment, the front air duct plate 222 and the rear air duct plate 223 are fixed by clips and screws, and the centrifugal fan 210 is fixed to the air duct 220 by screws. The above fixing method facilitates the assembly of the front air duct plate 222 and the rear air duct plate 223 , and also makes the fixing of the centrifugal fan 210 and the air duct 220 simple and easy.

In addition, the fresh air system 200 may further include: an air inlet duct assembly 230 configured to pass through the second air inlet 114 to be connected to the fresh air inlet 224 , so that the air of the outdoor environment can enter the accommodating cavity 221 . Specifically, the air inlet pipe assembly 230 may include: a fresh air duct 231 , a fixing collar 232 and an air inlet protection pipe 233 .

One end of the fresh air duct 231 is clamped to the fresh air inlet 224 . Actually, one end of the fresh air duct 231 is connected to the fresh air inlet 224 after passing through the second air inlet 114 . Specifically, the fresh air inlet 224 may be provided with a buckle, and one end of the fresh air duct 231 may be correspondingly provided with a rotating clamping slot 234 . In this way, one end of the fresh air duct 231 can be easily clamped with the fresh air inlet 224 after passing through the second air inlet 114, and the structure is simple and reasonable.

The fixing collar 232 is configured to fix the other end of the fresh air duct 231 to the wall of the indoor environment. In this way, it can be avoided that the fresh air duct 231 is easily moved and dislocated, which affects the normal air intake. The air inlet protection pipe 233 is connected with the fixed collar 232 and is configured so that foreign objects or rainwater in the air in the outdoor environment will not enter the accommodating cavity 221 . As shown in FIG. 4 , the side of the air inlet protection pipe 233 facing the outdoor environment can be set as a grille, so that foreign objects in the outdoor ambient air can be effectively intercepted, and the setting of a certain length of the air inlet protection pipe 233 can make the rainwater also Effectively intercepted, it will not enter the fresh air duct 231, and furthermore, the accommodating cavity 221 will not be blown out. The arrangement of the air inlet protection pipe 233 can effectively improve the air supply quality of the fresh air system 200 .

In a preferred embodiment, the fresh air system 200 may further include: a dust filter screen 240 . The dust filter 240 may be disposed in the accommodating cavity 221 and configured to filter the air entering the outdoor environment of the accommodating cavity 221 . As shown in FIGS. 3 to 5 , one side of the rear air duct plate 223 and the front air duct can be tightly connected, and a certain gap can be left on the other side so that the dust filter 240 can be inserted. In addition, after the front panel 111 and the rear panel 112 are assembled, the gap will not be covered, so that a part of the dust filter 240 is exposed to the outside, and this part can be provided with a handle, which is further convenient for users to take and place, and effectively improves the convenience of cleaning .

More preferably, the dust filter 240 may be a HEPA (High Efficiency Particle Air, high-efficiency air purification) filter. According to international standards, HEPA filters are divided into 5 grades according to the filtration efficiency: coarse filter, medium efficiency filter, sub-high-efficiency filter, high-efficiency filter and ultra-high-efficiency filter. Specifically, the dust filter 240 in this embodiment may be a HEPA filter with a filtration efficiency of 95% of grade E11; or may be a HEPA filter of a grade of H13 with a filtration efficiency of 99.97%. In addition, the dust filter 240 may also be provided with an activated carbon layer to further adsorb organic gases, and further ensure that the air sent to the room by the fresh air system 200 meets the health needs of the user.

It should be noted that the specific numerical values of the grade and filtration efficiency of the dust filter 240 described above are merely examples, and do not limit the present invention. In some other embodiments, the dust filter screen 240 of other grades and filtration efficiency can be set according to the actual situation. The setting of the dust filter 240 can efficiently purify the air sent to the room and improve the user's comfort.

The fresh air system 200 may further include: an air outlet protective structure 250 fixedly connected to the outlet 212 of the centrifugal fan 210 , and a protective net 251 is provided in the card slot of the air outlet protective structure 250 . The air outlet protection structure 250 can be connected and fixed with the outlet 212 of the centrifugal fan 210 through screws. In a specific embodiment, the protective net 251 provided in the clip slot of the air outlet protective structure 250 may be an iron wire.

It should be noted that the air outlet protection structure 250 is matched with the second air outlet 116 on the front panel 111 , for example, the shape and height of the two are the same, and the second air outlet 116 can expose the air outlet protection structure 250 , so that the centrifugal fan 210 can be smoothly discharged. In addition, the second air inlet 114 of the rear panel 112 is also matched with the fresh air inlet 224 of the rear air duct panel 223 , so that the air inlet duct assembly 230 can smoothly pass through the second air inlet 114 and be connected to the fresh air inlet 224 .

FIG. 3 actually shows the view from the front side of the fresh air system 200 , while FIG. 4 shows the view from the rear side of the fresh air system 200 . As shown in FIG. 3 and FIG. 4 , a power supply device electrode 225 may be provided on the side of the front air duct plate 222 for supplying power to related devices. In addition, a carbon dioxide sensor 226 may also be disposed at the front of the front air duct panel 222 for detecting the concentration of carbon dioxide. The concentration of carbon dioxide in buildings can have a significant impact on the health of those who live and work in them, as even small levels of carbon dioxide, such as indoors above 1200 PPM, can cause people to yawn and doze off.

Therefore, it becomes necessary to monitor the concentration of carbon dioxide. In some specific embodiments, infrared carbon dioxide sensors, catalytic carbon dioxide sensors, or thermally conductive carbon dioxide sensors may be employed. Among them, the infrared carbon dioxide sensor uses the principle of non-dispersive infrared (NDIR) to detect carbon dioxide in the air, which has good selectivity and no oxygen dependence. The catalytic carbon dioxide sensor converts the carbon dioxide concentration detected on site into a standard current signal output. The thermal conductivity carbon dioxide sensor is made according to the principle that the total thermal conductivity of the mixed gas changes with the content of the gas to be analyzed. The detection element and the compensation element are paired to form the two arms of the bridge. When encountering non-combustible gas, the resistance of the detection element becomes larger (air background), the bridge output voltage variable, the voltage variable increases proportionally with the increase of gas concentration, and the compensation element plays the role of reference and temperature compensation. It should be noted that the type of the carbon dioxide sensor 226 described above is merely an example, rather than a limitation of the present invention. In other embodiments, other types of carbon dioxide sensor 226 may also be used.

The indoor unit 100 of the vertical air conditioner in this embodiment includes: a casing 110, the interior of which defines a cavity, and the rear side of the casing 110 is provided with a first air inlet 113 and a second air inlet 114 from top to bottom. The front side of the body 110 is provided with a first air outlet 115 and a second air outlet 116 from top to bottom, wherein the first air inlet 113 is configured to allow the air of the indoor environment where the indoor unit 100 of the vertical air conditioner is located to enter the cavity; the main body part, It is arranged in the cavity and configured to exchange heat with the air entering the cavity through the first air inlet 113, and blow the heat-exchanged air out through the first air outlet 115; and the fresh air system 200 is arranged below the main body, It is configured such that air from the outdoor environment enters the cavity and is blown out through the second air outlet 116 . The traditional air outlet is realized through the main body, and the fresh air function is realized through the fresh air system 200, which effectively solves the problem of indoor air pollution, improves the air supply quality of the air conditioner, efficiently purifies the air sent to the room, and improves the user comfort.

Further, the indoor unit 100 of the vertical air conditioner and the fresh air system 200 of this embodiment include: a centrifugal fan 210, the rotation axis of the impeller of which is in a vertical direction, and the lower part of the centrifugal fan 210 can enter the air and the front part can discharge the air, avoiding setting The additional structure changes the wind direction, effectively simplifying the air supply structure and reducing the occupied volume. The air inlet protection pipe 233 is configured so that foreign objects or rainwater in the air of the outdoor environment will not enter the accommodating cavity 221; the dust filter screen 240 is configured to filter the air entering the outdoor environment of the accommodating cavity 221, which can further improve the air supply. quality. The air outlet direction of the second air outlet 116 is obliquely upward, so as to mix with the air blown out from the first air outlet 115 , and avoid direct blowing while increasing the air outlet volume, thereby improving the user experience.

Those skilled in the art should understand that, unless otherwise specified, the terms "up", "down", "left", "right", "front" and "rear" in the embodiments of the present invention are used to represent The terms of orientation or positional relationship are based on the actual use state of the indoor unit 100 of the vertical air conditioner, and these terms are only for the convenience of describing and understanding the technical solutions of the present invention, rather than indicating or implying the devices or devices referred to. The parts must have a specific orientation and therefore should not be construed as limiting the invention.

By now, those skilled in the art will recognize that, although various exemplary embodiments of the present invention have been illustrated and described in detail herein, the present invention may still be implemented in accordance with the present disclosure without departing from the spirit and scope of the present invention. The content directly determines or derives many other variations or modifications consistent with the principles of the invention. Accordingly, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims

An indoor unit of a vertical air conditioner, comprising:

The casing has a cavity defined inside, and the rear side of the casing is provided with a first air inlet and a second air inlet from top to bottom, and the front side of the casing is provided with a first air outlet and a second air inlet from top to bottom. a second air outlet, wherein the first air inlet is configured to allow the air of the indoor environment where the indoor unit of the vertical air conditioner is located to enter the cavity;

a main body part, disposed in the cavity, configured to exchange heat with the air entering the cavity through the first air inlet, and blow the heat-exchanged air out through the first air outlet; and

The fresh air system is arranged below the main body portion, and is configured to allow the air of the outdoor environment to enter the cavity and blow out through the second air outlet.
The vertical air conditioner indoor unit according to claim 1, wherein the fresh air system comprises:

Centrifugal fan, the axis of rotation of its impeller is vertical;

The air duct is arranged below the centrifugal fan, and defines an accommodating cavity in communication with the inlet of the centrifugal fan.
The indoor unit of a vertical air conditioner according to claim 2, wherein:

The air duct includes a front air duct plate and a rear air duct plate, and the rear air duct plate is provided with a fresh air inlet.
The vertical air conditioner indoor unit according to claim 3, wherein:

The front air duct plate and the rear air duct plate are fixed by clips and screws,

The centrifugal fan is fixed with the air duct by screws.
The vertical air conditioner indoor unit according to claim 3, wherein the fresh air system further comprises:

The air inlet pipe assembly is configured to pass through the second air inlet and be connected to the fresh air inlet, so that the air of the outdoor environment can enter the accommodating cavity.
The indoor unit of a vertical air conditioner according to claim 5, wherein the air inlet duct assembly comprises:

a fresh air duct, one end of which is clamped to the fresh air inlet;

a securing collar configured to secure the other end of the fresh air duct to the wall of the indoor environment; and

The air inlet protection pipe is connected with the fixed collar and is configured so that foreign objects or rainwater in the air of the outdoor environment will not enter the accommodating cavity.
The vertical air conditioner indoor unit according to claim 2, wherein the fresh air system further comprises:

A dust filter is arranged in the accommodating cavity and configured to filter the air entering the outdoor environment of the accommodating cavity.
The vertical air conditioner indoor unit according to claim 2, wherein the fresh air system further comprises:

The air outlet protection structure is fixedly connected with the outlet of the centrifugal fan, and

A protective net is arranged in the card slot of the air outlet protective structure.
The indoor unit of a vertical air conditioner according to claim 1, wherein:

The air outlet direction at the second air outlet is obliquely upward, so as to be mixed with the air blown from the first air outlet.
The floor-type air conditioner indoor unit according to claim 1, wherein the main body portion comprises:

a heat exchanger configured to exchange heat for air entering the cavity from the first air inlet; and

The fan is configured to blow out the heat-exchanged air through the first air outlet.