CN215597463U

CN215597463U - Air conditioner indoor unit and air conditioner

Info

Publication number: CN215597463U
Application number: CN202120815672.3U
Authority: CN
Inventors: 崔化超; 崔凯; 李进超; 李国行; 郝本华; 刘庆赟
Original assignee: Qingdao Haier Air Conditioner Gen Corp Ltd; Qingdao Haier Air Conditioning Electric Co Ltd; Haier Smart Home Co Ltd
Current assignee: Qingdao Haier Air Conditioner Gen Corp Ltd; Qingdao Haier Air Conditioning Electric Co Ltd; Haier Smart Home Co Ltd
Priority date: 2021-04-20
Filing date: 2021-04-20
Publication date: 2022-01-21
Anticipated expiration: 2031-04-20

Abstract

The utility model provides an air conditioner indoor unit and an air conditioner, and relates to the technical field of air conditioner adjusting equipment. The air-conditioning indoor unit comprises a casing, a cross-flow fan, a centrifugal fan and a double-shaft motor, wherein the casing is provided with a main air channel and a fresh air channel, the cross-flow fan is installed in the main air channel, the centrifugal fan is installed in the fresh air channel, the double-shaft motor is arranged between the main air channel and the fresh air channel, one end of the double-shaft motor is connected with the cross-flow fan, and the other end of the double-shaft motor is connected with the centrifugal fan. According to the air conditioner indoor unit and the air conditioner, one end of the double-shaft motor is connected with the cross-flow fan, the other end of the double-shaft motor is connected with the centrifugal fan, the cross-flow fan and the centrifugal fan are synchronously driven to rotate by the same double-shaft motor, compared with a traditional driving mode that the cross-flow fan and the centrifugal fan are respectively driven to rotate by the two motors, the number of the motors is reduced, the manufacturing cost is reduced, and the indoor noise source is reduced.

Description

Air conditioner indoor unit and air conditioner

Technical Field

The utility model relates to the technical field of air conditioner adjusting equipment, in particular to an air conditioner indoor unit and an air conditioner.

Background

The air conditioner can cause indoor air to be dirty after running for a long time, and therefore the fresh air module is additionally arranged on the air conditioner to introduce outdoor fresh air into a room.

After the traditional air conditioner is additionally provided with the independent fresh air module, a fan in the fresh air duct is independently provided with a driving motor, so that the number of the driving motors in the whole air conditioner is increased, a new noise source is generated in an indoor environment, and the user experience in an air-conditioning room is influenced; meanwhile, the production cost is increased by adding the driving motors, and the workload is correspondingly increased when the driving motors are arranged and electrically connected.

SUMMERY OF THE UTILITY MODEL

The utility model provides an air conditioner indoor unit and an air conditioner, which are used for solving the defects that a fresh air conditioner in the prior art increases noise sources and production cost in an indoor environment.

The utility model provides an indoor unit of an air conditioner, which comprises a casing, a cross-flow fan, a centrifugal fan and a double-shaft motor, wherein the casing is provided with a main air duct and a fresh air duct, the cross-flow fan is arranged in the main air duct, the centrifugal fan is arranged in the fresh air duct, the double-shaft motor is arranged between the main air duct and the fresh air duct, one end of the double-shaft motor is connected with the cross-flow fan, and the other end of the double-shaft motor is connected with the centrifugal fan.

According to the indoor unit of the air conditioner, the first shaft body of the double-shaft motor extends into the main air duct and is connected with the cross-flow fan, the second shaft body of the double-shaft motor extends into the fresh air duct and is connected with the centrifugal fan, and the main body of the double-shaft motor is located outside the main air duct.

According to the air-conditioning indoor unit provided by the utility model, the air-conditioning indoor unit further comprises a clutch, the first shaft body of the double-shaft motor is connected with the cross-flow fan, and the second shaft body of the double-shaft motor is selectively connected with the centrifugal fan through the clutch.

According to the air conditioner indoor unit provided by the utility model, the clutch is a jaw clutch, a driving shaft of the jaw clutch is fixedly connected with a second shaft body of the double-shaft motor, and a driven shaft of the jaw clutch is fixedly connected with a shaft body of the centrifugal fan.

According to the air-conditioning indoor unit provided by the utility model, the clutch is a gear type one-way clutch, a second shaft body of the double-shaft motor is fixedly connected with an input gear in the one-way clutch, and an output gear in the one-way clutch is fixedly connected with a shaft body of the centrifugal fan.

According to the indoor unit of the air conditioner, the fresh air duct is located below the main air duct, the water pan is arranged below the main air duct, the water pan is convexly provided with the accommodating groove towards the direction of the main air duct, the double-shaft motor is accommodated in the accommodating groove, and the bottom of the accommodating groove is provided with the through hole for the first shaft body of the double-shaft motor to pass through.

The air conditioner indoor unit further comprises a heat exchanger, wherein the heat exchanger is arranged in the main air duct and is used for cooling and/or heating indoor air; and a second air inlet is formed in the back surface of the shell and communicated with the outdoor environment.

According to the air conditioner indoor unit provided by the utility model, the filter screen is arranged in the fresh air duct and is positioned between the air inlet of the fresh air duct and the centrifugal fan.

The air conditioner indoor unit further comprises a front decorative plate, and the front decorative plate is provided with a vent hole corresponding to the air outlet of the fresh air duct.

The utility model also provides an air conditioner which comprises the air conditioner indoor unit.

According to the air conditioner indoor unit and the air conditioner, one end of the double-shaft motor is connected with the cross-flow fan, the other end of the double-shaft motor is connected with the centrifugal fan, the cross-flow fan and the centrifugal fan are synchronously driven to rotate by the same double-shaft motor, compared with a traditional driving mode that the cross-flow fan and the centrifugal fan are respectively driven to rotate by the two motors, the number of the motors is reduced, the manufacturing cost is reduced, and the indoor noise source is reduced.

Drawings

In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

Fig. 1 is a perspective view of an indoor unit of an air conditioner according to the present invention;

fig. 2 is a side view of the air conditioning indoor unit shown in fig. 1;

fig. 3 is a side view of the air conditioning indoor unit shown in fig. 1 from another perspective;

reference numerals:

1: a main air duct; 2: a cross-flow fan; 3: a fresh air duct;

4: a centrifugal fan; 5: a double-shaft motor; 6: a water pan.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The features of the terms first and second in the description and in the claims of the present application may explicitly or implicitly include one or more of such features. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.

In the description of the present invention, it is to be understood that the positional or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., are based on the positional or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the present invention.

The structure of the indoor unit of an air conditioner according to the present invention will be described with reference to fig. 1 to 3.

As shown in fig. 1, an air conditioning indoor unit according to an embodiment of the present invention includes a casing, a cross flow fan 2, a centrifugal fan 4, and a dual-shaft motor 5. The casing has main wind channel 1 and new trend wind channel 3. The cross flow fan 2 is arranged in the main air duct 1, and the centrifugal fan 4 is arranged in the fresh air duct 3. The double-shaft motor 5 is arranged between the main air duct 1 and the fresh air duct 3, one end of the double-shaft motor 5 is connected with the cross flow fan 2, and the other end is connected with the centrifugal fan 4.

The casing is the main part of the indoor unit of the air conditioner, and for the cabinet type indoor unit of the air conditioner, the casing can be vertically placed on the ground of an air conditioning room. The shell is internally provided with a fresh air duct 3, and the fresh air duct 3 is a channel used by a fresh air module and is a place for exchanging indoor air and outdoor air. The main air duct 1 is a passage used by a heat exchange module of an air conditioner indoor unit, and is a place for heat exchange refrigeration or heating of air in an air conditioner room. Specifically, the cross flow fan 2 is installed in the main air duct 1 and used for blowing air after heat exchange into the indoor environment through the air outlet hole in the casing. Centrifugal fan 4 installs in new trend wind channel 3, and centrifugal fan 4 produces the negative pressure in new trend wind channel 3 in order to inhale new trend wind channel 3 with outdoor fresh air in, and then input to indoor.

According to the indoor unit of the air conditioner, one end of the double-shaft motor 5 is connected with the cross-flow fan 2, the other end of the double-shaft motor is connected with the centrifugal fan 4, the same double-shaft motor 5 is used for synchronously driving the cross-flow fan 2 and the centrifugal fan 4 to rotate, and compared with a traditional driving mode that two motors are used for respectively driving the cross-flow fan 2 and the centrifugal fan 4 to rotate, the number of the motors is reduced, the manufacturing cost is reduced, and the indoor noise source is reduced.

In one embodiment, as shown in fig. 2 and 3, the centrifugal fan 4 and the cross flow fan 2 are synchronously moved by the driving of the two-shaft motor 5. For example, the dual-shaft motor 5 is installed outside the main air duct 1, a first shaft of the dual-shaft motor 5 extends into the main air duct 1 and is fixedly connected with the cross-flow fan 2, and a second shaft of the dual-shaft motor 5 extends into the fresh air duct 3 and is fixedly connected with the centrifugal fan 4. For another example, the dual-shaft motor 5 is installed in the main air duct 1, and the second shaft of the dual-shaft motor 5 passes through the main air duct 1 and is fixed with the centrifugal fan 4. The fixed connection can be a coupling connection, a bushing connection or other equivalent ways.

In another embodiment, the air conditioning indoor unit further comprises a clutch, a first shaft body of the double-shaft motor 5 is fixedly connected with the cross-flow fan 2, and a second shaft body of the double-shaft motor 5 is selectively connected with the centrifugal fan 4 through the clutch. When the air conditioner is used for refrigerating or heating, the double-shaft motor 5 drives the cross-flow fan 2 to move, and a second shaft body of the double-shaft motor 5 is separated from the centrifugal fan 4 in transmission fit; when the temperature is adjusted to cause indoor air to be dirty, fresh air needs to be introduced or a fresh air mode is started, the second shaft body of the double-shaft motor 5 is in transmission fit with the centrifugal fan 4, and the indoor air freshness is adjusted while the temperature is adjusted. Likewise, the fixed connection may be a coupling connection, a bushing connection or other equivalent means.

On the basis of the above embodiment, the clutch is a dog clutch, a driving shaft of the dog clutch is fixedly connected with the second shaft of the dual-shaft motor 5, and a driven shaft of the dog clutch is fixedly connected with the shaft of the centrifugal fan 4.

Specifically, the jaw clutch comprises a first clutch and a second clutch, teeth are arranged on the end faces of the first clutch and the second clutch, the first clutch is fixed on the driving shaft, the second clutch is connected with the driven shaft through a flat key or a spline, and the sliding block is moved axially through the control mechanism to enable the second clutch to move axially, so that the clutch effect is achieved. Wherein, the operating end of the operating mechanism is exposed out of the air conditioner shell so as to be convenient for manual operation. After the operation end of the operating mechanism is manually operated, synchronous transmission is started, and the centrifugal fan 4 and the cross-flow fan 2 rotate synchronously. Wherein, the centrifugal fan 4 and the cross flow fan 2 are coaxially arranged up and down.

In this embodiment, the second shaft of the dual-shaft motor 5 is selectively engaged with the centrifugal fan 4 by a dog clutch, so that the cross-flow fan 2 and the centrifugal fan 4 are rotated synchronously or only the cross-flow fan 2 is rotated, so as to control the start and stop of the centrifugal fan 4 as required.

Or the clutch is a gear type one-way clutch, the second shaft body of the double-shaft motor 5 is fixedly connected with the input gear of the one-way clutch, and the output gear of the one-way clutch is fixedly connected with the shaft body of the centrifugal fan 4. Because the input gear and the output gear in the one-way clutch are in parallel at intervals, the arrangement of the cross-flow fan 2 and the centrifugal fan 4 can be staggered in the horizontal direction correspondingly.

The gear type one-way clutch includes an input gear, a transmission gear, and an output gear. When the transmission gear is respectively meshed with the input gear and the output gear, the input gear transmits power to the output gear through the transmission gear, and the input gear and the output gear both rotate. When the transmission gear slides upwards, the input gear and the output gear are respectively disengaged from the transmission gear, and only the input gear rotates at the moment.

The one-way clutch in this embodiment realizes non-coaxial arrangement of the centrifugal fan 4 and the cross flow fan 2 by means of gears, and the space layout is free.

On the basis of any one of the above embodiments, the fresh air duct 3 is located below the main air duct 1, the water pan 6 is arranged below the main air duct 1, the water pan 6 is convexly provided with a containing groove towards the main air duct 1, the double-shaft motor 5 is contained in the containing groove, and the bottom of the containing groove is provided with a through hole for the first shaft body of the double-shaft motor 5 to pass through.

As shown in fig. 2 and 3, the lower part of the casing is provided with a fresh air module, the fresh air module defines a fresh air duct 3, the fresh air module comprises a fresh air inlet and a fresh air outlet which are communicated with the fresh air duct 3, the fresh air inlet is communicated with the outdoor environment, and the fresh air outlet is communicated with the indoor environment.

Taking an air conditioner with a refrigeration function as an example, in order to receive condensed water, a water pan 6 is arranged below the main air duct 1, a double-shaft motor 5 is accommodated in a holding tank convexly arranged on the water pan 6, and a shell of the double-shaft motor 5 is fixedly connected with two side upright posts and/or the water pan 6 of an air conditioner indoor unit. The air-conditioning indoor unit only has a heating function, a water pan 6 is not arranged below the main air duct 1, and the double-shaft motor 5 is fixedly arranged on a shell of the air-conditioning indoor unit.

The indoor unit of the air conditioner comprises a fresh air module and a heat exchange module. The double-shaft motor 5 is arranged between the fresh air module and the heat exchange module. The fresh air module comprises a fresh air duct 3, a purification unit, a fan and other functional parts, the heat exchange module comprises a main air duct 1 and a heat exchanger, and the heat exchanger is installed in the main air duct 1 and used for cooling and/or heating indoor air.

In this embodiment, with new trend module and traditional heat exchange module integration in a casing, the new trend that the new trend module was inhaled is carried to indoor each corner, reduces indoor PM2.5, carbon dioxide concentration, VOC concentration etc. fast, avoids the long-time operation of heat exchanger to lead to the reduction of user's travelling comfort.

The fresh air duct 3 is internally provided with a filter screen which is positioned between an air inlet of the fresh air duct 3 and the centrifugal fan 4. In order to improve the indoor air quality and prevent outdoor polluted air from entering the room, the fresh air module further comprises a filter screen, the filter screen is arranged in the fresh air duct 3, and the filter screen is positioned between the fresh air inlet and the centrifugal fan 4.

The filter screen that this embodiment provided can filter the impurity in the air, avoids dust etc. to get into indoor, leads to indoor air quality to descend. Set up the filter screen between new trend air intake and centrifugal fan 4, can also effectively avoid dust etc. to gather on the fan, improve the operating efficiency and the life of fan.

The indoor unit of the air conditioner further comprises a front decorative plate, and the front decorative plate is provided with a ventilation hole corresponding to the air outlet of the fresh air duct 3. The ventilation hole that sets up on the front trim board has a plurality ofly, and a plurality of ventilation holes are arranged at random or are circular array and arrange corresponding to the new trend air outlet in new trend wind channel 3. The vent holes are round holes, square holes or rhombic holes, and the shapes of the vent holes are not particularly limited in the embodiment of the utility model.

The indoor unit of the air conditioner provided by the embodiment of the utility model is a cabinet unit, and the casing of the indoor unit of the air conditioner can be a square cabinet or a round cabinet, so that the embodiment of the utility model is not particularly limited. The fresh air duct 3 and the main air duct 1 in the indoor unit of the air conditioner are mutually independent and do not interfere with each other, the centrifugal fan 4 guides outdoor air to the indoor space, and the cross flow fan 2 is used for providing airflow circulating power for cooling or heating in the main air duct 1.

As shown in fig. 1 to 3, an indoor unit of an air conditioner according to an embodiment of the present invention includes a casing, a cross-flow fan 2, a centrifugal fan 4, a dual-shaft motor 5, and a water pan 6. The casing has main wind channel 1 and new trend wind channel 3. The cross flow fan 2 is arranged in the main air duct 1, and the centrifugal fan 4 is arranged in the fresh air duct 3. The water pan 6 is arranged below the main air duct 1. The double-shaft motor 5 is accommodated in the accommodating groove in the middle of the water pan 6, one end of the double-shaft motor 5 is connected with the cross-flow fan 2, and the other end of the double-shaft motor is connected with the centrifugal fan 4. Under the action of the double-shaft motor 5, the cross-flow fan 2 and the centrifugal fan 4 rotate synchronously.

In another embodiment, the indoor unit of an air conditioner provided in the embodiment of the present invention includes a casing, a cross flow fan 2, a clutch, a centrifugal fan 4, a dual-shaft motor 5, and a water pan 6. The casing has main wind channel 1 and new trend wind channel 3. The cross flow fan 2 is arranged in the main air duct 1, and the centrifugal fan 4 is arranged in the fresh air duct 3. The water pan 6 is arranged below the main air duct 1. The double-shaft motor 5 is accommodated in an accommodating groove in the middle of the water pan 6, one end of the double-shaft motor 5 is fixedly connected with the cross-flow fan 2, and the other end of the double-shaft motor is selectively connected with the centrifugal fan 4 through a clutch. When the dual-shaft motor 5 is operated, the cross flow fan 2 is moved synchronously, and the centrifugal fan 4 is engaged with the dual-shaft motor 5 to rotate synchronously after the fresh air mode is started.

The embodiment of the utility model also provides an air conditioner, which comprises an air conditioner outdoor unit and the air conditioner indoor unit, wherein the air conditioner indoor unit is connected with the air conditioner outdoor unit through a refrigerant pipe.

The air conditioner uses the air conditioner indoor unit, and the same double-shaft motor 5 is used for synchronously driving the cross-flow fan 2 and the centrifugal fan 4, so that the number of driving parts is reduced, indoor noise sources are reduced, and indoor user experience is improved.

It should be noted that the indoor unit of the air conditioner can also be used as an independent air conditioner, for example, the indoor unit of the air conditioner is an electric heating type fan heater, which does not include an outdoor unit of the air conditioner, and fresh air can be introduced from the outdoor at the same time to avoid air pollution in an indoor closed space during heating.

When the air conditioner is a single heating fan heater, the structure of the air conditioner is as follows:

the air conditioner comprises an air conditioner indoor unit, no condensed water is generated, and a water receiving disc is not required to be arranged. The indoor unit of the air conditioner comprises a shell, a cross-flow fan 2, a centrifugal fan 4 and a double-shaft motor 5. The casing has main wind channel 1 and new trend wind channel 3. The cross flow fan 2 is arranged in the main air duct 1, and the centrifugal fan 4 is arranged in the fresh air duct 3. The double-shaft motor 5 is arranged on the mounting column of the machine shell and is positioned between the main air duct 1 and the fresh air duct 3. One end of the double-shaft motor 5 is connected with the cross-flow fan 2, and the other end is connected with the centrifugal fan 4. Under the action of the double-shaft motor 5, the cross-flow fan 2 and the centrifugal fan 4 rotate synchronously. Wherein, the fresh air inlet of the fresh air duct 3 is communicated with the outdoor environment through a pipeline, and the main air duct 1 is used for heating the indoor air.

And a heat exchanger is arranged in the main air duct 1 and is arranged between the cross-flow fan 2 and the air outlet of the main air duct or between the cross-flow fan 2 and the air inlet of the main air duct. In one embodiment, a heating element is installed in the fresh air duct 3 to compensate the influence of low-temperature outdoor air on the indoor temperature. The heating element can be an electric heating tube or PTC electric auxiliary heating and the like, and the heating element is supplied with power in a centralized way through an electric cabinet of the air conditioner. The heating element may be installed on one side of the centrifugal fan 4 close to the fresh air inlet or one side of the fresh air outlet, and the present invention is not limited thereto.

In one embodiment, the air conditioner starts the heating mode, and after the indoor temperature reaches a preset temperature and is maintained for a preset time, the double-shaft motor 5 is automatically connected with the centrifugal fan 4, so that fresh air is introduced while the temperature is controlled. In another embodiment, after the air conditioner starts the fresh air mode, the double-shaft motor 5 is connected with the centrifugal fan 4.

When the air conditioner is a single refrigerating air cooler, the structure of the air conditioner is as follows:

the air conditioner comprises an air conditioner indoor unit, wherein the air conditioner indoor unit comprises a shell, a cross-flow fan 2, a centrifugal fan 4, a double-shaft motor 5 and a water pan 6. The casing has main wind channel 1 and new trend wind channel 3. The cross flow fan 2 is arranged in the main air duct 1, and the centrifugal fan 4 is arranged in the fresh air duct 3. The water pan 6 is arranged below the main air duct 1 and is used for receiving condensed water generated by refrigeration of the heat exchanger in the main air duct 1. The double-shaft motor 5 is accommodated in the accommodating groove in the middle of the water pan 6, one end of the double-shaft motor 5 is connected with the cross-flow fan 2, and the other end of the double-shaft motor is connected with the centrifugal fan 4. Under the action of the double-shaft motor 5, the cross-flow fan 2 and the centrifugal fan 4 rotate synchronously. Wherein, the fresh air inlet of the fresh air duct 3 is communicated with the outdoor environment through a pipeline, and the main air duct 1 is used for heating the indoor air.

When the air conditioner is an air conditioner with the functions of refrigeration and heating, the structure is as follows:

the air conditioner comprises an air conditioner indoor unit and an air conditioner outdoor unit, and the air conditioner outdoor unit is connected with the air conditioner indoor unit through a refrigerant pipe. The structure of the indoor unit of the air conditioner is the same as the structure of the indoor unit of the air conditioner, and the description is omitted.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. The indoor unit of the air conditioner is characterized by comprising a casing, a cross-flow fan, a centrifugal fan and a double-shaft motor, wherein the casing is provided with a main air channel and a fresh air channel, the cross-flow fan is installed in the main air channel, the centrifugal fan is installed in the fresh air channel, the double-shaft motor is arranged between the main air channel and the fresh air channel, one end of the double-shaft motor is connected with the cross-flow fan, and the other end of the double-shaft motor is connected with the centrifugal fan.

2. An indoor unit of an air conditioner according to claim 1, wherein a first shaft of the dual-shaft motor extends into the main air duct and is connected to the cross-flow fan, a second shaft of the dual-shaft motor extends into the fresh air duct and is connected to the centrifugal fan, and a main body of the dual-shaft motor is located outside the main air duct.

3. An indoor unit of an air conditioner according to claim 1, further comprising a clutch, wherein a first shaft of the dual shaft motor is connected to the cross flow fan, and a second shaft of the dual shaft motor is selectively engaged with the centrifugal fan through the clutch.

4. The indoor unit of claim 3, wherein the clutch is a dog clutch, a driving shaft of the dog clutch is fixedly connected to the second shaft of the dual shaft motor, and a driven shaft of the dog clutch is fixedly connected to the shaft of the centrifugal fan.

5. An indoor unit of an air conditioner according to claim 3, wherein the clutch is a gear type one-way clutch, the second shaft of the two-shaft motor is fixedly connected to an input gear of the one-way clutch, and an output gear of the one-way clutch is fixedly connected to a shaft of the centrifugal fan.

6. An indoor unit of an air conditioner as claimed in any one of claims 1 to 5, wherein the fresh air duct is located below the main air duct, a water pan is disposed below the main air duct, a receiving groove is convexly formed in the water pan in a direction of the main air duct, the dual-shaft motor is received in the receiving groove, and a through hole for a first shaft of the dual-shaft motor to pass through is formed in a bottom of the receiving groove.

7. An indoor unit of an air conditioner according to any one of claims 1 to 5, further comprising a heat exchanger installed in the main duct for cooling and/or heating indoor air; and a second air inlet is formed in the back surface of the shell and communicated with the outdoor environment.

8. An indoor unit of an air conditioner according to any one of claims 1 to 5, wherein a filter screen is installed in the fresh air duct, and the filter screen is located between the air inlet of the fresh air duct and the centrifugal fan.

9. An indoor unit of an air conditioner according to any one of claims 1 to 5, further comprising a front decorative plate provided with a vent hole corresponding to the air outlet of the fresh air duct.

10. An air conditioner characterized by comprising the indoor unit of an air conditioner according to any one of claims 1 to 9.