CN111043668A

CN111043668A - Indoor unit of air conditioner

Info

Publication number: CN111043668A
Application number: CN201911419557.8A
Authority: CN
Inventors: 董明珠; 陈诚; 何振健; 王千千; 吴晓岳
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-04-21

Abstract

The invention provides an air-conditioning indoor unit, comprising: the plurality of air duct structures are arranged at intervals; the air channel structure comprises a volute and a volute tongue, wherein a first communication port, a second communication port and an air inlet are formed in the volute, the first communication port is formed in the first side of the volute, and the second communication port is formed in the second side of the volute; the volute tongue is movably arranged on the volute so that the volute tongue is provided with a first blocking position for blocking the first communication port and a second blocking position for blocking the second communication port; the air channel baffle is movably arranged on the first side of the volute and is provided with a shielding position for shielding gaps among the air channel structures and an avoiding position for avoiding the gaps among the air channel structures; when the volute tongue is at the first blocking position, the air duct baffle is at an avoiding position; when the volute tongue is at the second blocking position, the air duct baffle is at the blocking position. The technical problem that the comfort of an air conditioner indoor unit in the prior art is poor is solved.

Description

Indoor unit of air conditioner

Technical Field

The invention relates to the technical field of air conditioning equipment, in particular to an air conditioner indoor unit.

Background

At present, a vertical cabinet air conditioner in the prior art mainly includes a square upper air outlet cabinet, an i-shaped long air outlet cabinet (a first air outlet and a second air outlet, the first air outlet and the second air outlet are arranged at an interval from top to bottom, and the air outlet length of the second air outlet is greater than that of the first air outlet), and a distributed air supply cabinet which simultaneously exhausts air from top to bottom. Due to the characteristics of cold air and hot air of cold air sinking and hot air floating, the problem of heat stratification of indoor air can be caused during air supply of refrigeration and heating. The return air position of the cabinet air conditioner is unchanged, so that the heat distribution is unchanged. When the cabinet air conditioner carries out heat exchange aiming at indoor temperature, the problem of heat layering of the distributed air supply cabinet is relatively small, and the difference between the upper temperature and the lower temperature is small.

However, these cabinet air conditioners in the prior art still cannot overcome the problem of low efficiency of energy utilization caused by the characteristics of cold air and hot air, and because the air outlet position of the cabinet air conditioner is fixed and not purposefully arranged, the comfort problem caused by heat stratification is more obvious.

Disclosure of Invention

The invention mainly aims to provide an air conditioner indoor unit, which aims to solve the technical problem that the comfort of the air conditioner indoor unit in the prior art is poor.

In order to achieve the above object, the present invention provides an indoor unit of an air conditioner, comprising: the air duct structures are arranged at intervals; the air channel structure comprises a volute and a volute tongue, a first communicating port, a second communicating port and an air inlet are formed in the volute, the first communicating port and the second communicating port are both used for being communicated with the air inlet, the first communicating port is arranged on the first side of the volute, and the second communicating port is arranged on the second side of the volute; the volute tongue is movably arranged on the volute so that the volute tongue is provided with a first blocking position for blocking the first communication port and a second blocking position for blocking the second communication port; the air channel baffle is movably arranged on the first side of the volute and is provided with a shielding position for shielding gaps among the air channel structures and an avoiding position for avoiding the gaps among the air channel structures; when the volute tongue is at the first blocking position, the air duct baffle is at an avoiding position so that air flow enters the air inlet from the first side of the volute; when the volute tongue is at the second blocking position, the air duct baffle is at the blocking position, so that the air flow enters the air inlet from the second side of the volute.

Further, the air conditioning indoor unit further includes: the evaporator assembly is arranged opposite to the first communication port of the air duct structure, so that air flow enters the air inlet after heat exchange of the evaporator assembly, or the air flow is subjected to heat exchange through the evaporator assembly after flowing out of the first communication port.

Furthermore, the number of the air duct structures is two, and the air inlet of one air duct structure is opposite to the air inlet of the other air duct structure.

Further, the air duct baffle is rotatably arranged between the two air duct structures, so that the air duct baffle rotates to a shielding position or an avoiding position.

Further, the air conditioning indoor unit further includes: the first evaporator is arranged opposite to the first communication port of the air channel structure; and the second evaporator is connected with the first evaporator and is arranged opposite to the first communication port of the other air channel structure.

Further, the first evaporator and the second evaporator are connected at a predetermined angle to form a V-shaped structure.

Further, the volute tongue is rotatably arranged on the volute casing, so that the volute tongue can rotate to the first blocking position or the second blocking position.

Further, the air conditioning indoor unit further includes: and the driving end of the driving component is in driving connection with the volute tongue so as to drive the volute tongue to rotate through the driving component.

Further, the drive assembly includes: a motor; the first gear is connected with an output shaft of the motor so as to drive the first gear to rotate through the motor; and the second gear is arranged on the volute tongue and forms a driving end of the driving component so as to drive the volute tongue to rotate through the second gear.

Furthermore, the volute tongue is of a circular ring structure, an air outlet is formed in the circular ring structure, and when the volute tongue rotates to the first blocking position, the air outlet is opposite to the second communication port; when the volute tongue rotates to the second blocking position, the air outlet is arranged opposite to the first communication port.

Further, the air conditioning indoor unit further includes: the air conditioner comprises an indoor unit shell, wherein a first air opening and a second air opening are formed in the indoor unit shell and are arranged at intervals; the air duct structure is arranged in the shell of the indoor unit and is positioned between the first air opening and the second air opening, so that air flow is introduced from the first air opening and then blown out from the second air opening under the action of the air duct structure, or air flow is introduced from the second air opening and then blown out from the first air opening under the action of the air duct structure.

By applying the technical scheme of the invention, the air outlet position of the volute can be conveniently changed by changing the positions of the air duct baffle and the volute tongue, so that the corresponding first communicating port or second communicating port can be selected to exhaust according to the refrigeration mode or heating mode of the indoor unit of the air conditioner, and the comfort level of indoor air can be conveniently improved. Therefore, the technical problem that the comfort of the air conditioner indoor unit in the prior art is poor can be solved through the technical scheme provided by the invention.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic structural diagram illustrating a duct structure according to an embodiment of the present invention;

FIG. 2 is a schematic structural view illustrating another angle of a wind tunnel structure according to an embodiment of the present invention;

FIG. 3 illustrates an exploded view of a duct structure provided in accordance with an embodiment of the present invention;

fig. 4 is a cross-sectional view illustrating an air conditioning indoor unit according to an embodiment of the present invention;

fig. 5 is a cross-sectional view illustrating another angle of an air conditioning indoor unit according to an embodiment of the present invention;

fig. 6 is a schematic view illustrating an airflow direction of air entering from a first air inlet and exiting from a second air inlet of an indoor unit of an air conditioner according to an embodiment of the present invention;

fig. 7 is a schematic structural view illustrating an indoor unit casing of an air conditioning indoor unit according to an embodiment of the present invention;

FIG. 8 is a schematic view of the air flow direction at another angle in the operational mode of FIG. 6;

fig. 9 is a schematic view illustrating an airflow direction of air entering from a second air inlet and exiting from a first air outlet of an indoor unit of an air conditioner according to an embodiment of the present invention;

fig. 10 is a schematic view illustrating an airflow direction at another angle when the second air inlet of the indoor unit of the air conditioner enters the air outlet of the first air outlet according to an embodiment of the present invention;

fig. 11 is a schematic view illustrating an airflow direction at the casing of the indoor unit for air to enter from the first air inlet and to exit from the second air inlet of the indoor unit for air conditioning according to the first embodiment of the present invention;

FIG. 12 shows a schematic view of the gas flow direction at another angle in FIG. 11;

fig. 13 is a schematic view illustrating the air flow direction at the casing of the indoor unit for air to enter the second air inlet and exit the first air inlet of the indoor unit of the air conditioner according to the first embodiment of the present invention; and

fig. 14 shows a schematic view of the air flow profile at another angle in fig. 13.

Wherein the figures include the following reference numerals:

10. an air duct structure; 11. a volute; 111. a first communication port; 112. a second communication port; 113. an air inlet; 12. a volute tongue; 13. a fan; 20. an air duct baffle; 30. an evaporator assembly; 31. a first evaporator; 32. a second evaporator; 41. a motor; 42. a first gear; 43. a second gear; 50. an indoor unit casing; 51. a first tuyere; 52. a second tuyere; 60. a top cover; 70. a chassis.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

As shown in fig. 1 to 14, the present invention provides an indoor unit of an air conditioner, which includes a plurality of air duct structures 10 and an air duct baffle 20, wherein the air duct structures 10 are arranged at intervals. The air duct structure 10 includes a volute 11, a volute tongue 12 and a fan 13, the fan 13 includes a centrifugal blade, the centrifugal blade is rotatably disposed in the volute 11, the volute 11 is provided with a first communicating opening 111, a second communicating opening 112 and an air inlet 113, the first communicating opening 111 and the second communicating opening 112 are both used for being communicated with the air inlet 113, the first communicating opening 111 is disposed on a first side of the volute 11, and the second communicating opening 112 is disposed on a second side of the volute 11. The volute tongue 12 is movably disposed on the volute casing 11 such that the volute tongue 12 has a first blocking position blocking the first communication port 111 and a second blocking position blocking the second communication port 112. The air duct baffle 20 is movably disposed on the first side of the volute 11, and the air duct baffle 20 has a shielding position for shielding the gap between the plurality of air duct structures 10 and an avoiding position for avoiding the gap between the plurality of air duct structures 10. When the volute tongue 12 is in the first blocking position, the air duct baffle 20 is in the avoiding position, so that the air flow enters the air inlet 113 from the first side of the volute casing 11; when the volute tongue 12 is in the second blocking position, the duct baffle 20 is in the blocking position, so that the airflow enters the air inlet 113 from the second side of the volute casing 11.

By adopting the air-conditioning indoor unit provided by the embodiment, the air outlet position of the volute casing 11 can be conveniently changed by changing the positions of the air duct baffle 20 and the volute tongue 12 of the air duct structure 10, so that the corresponding first communication port 111 or second communication port 112 is selected to exhaust according to the cooling mode or heating mode of the air-conditioning indoor unit, and the comfort level of indoor air is improved. In the present embodiment, the first communication port 111 is located above the second communication port 112. When the volute tongue 12 is in the first blocking position, the volute tongue 12 blocks the first communication port 111, so that the volute tongue 12 and the upper portion of the air duct form a complete volute 11 profile. When the volute tongue 12 is in the second blocking position, the volute tongue 12 blocks the second communication port 112, so that the volute tongue 12 and the lower portion of the air duct form a complete molded line of the volute 11.

When the volute tongue 12 is in the first blocking position and the air duct baffle 20 is in the avoiding position, the air flow enters the air inlet 113 from the first side of the volute casing 11. At this time, the indoor unit of the air conditioner is in a heating mode. That is, when the volute tongue 12 is located at the first blocking position, the hot air flows into the air inlet 113 of each air duct structure 10 from the gap between the plurality of air duct structures 10, that is, enters the air inlet 113 from the first side of the volute casing 11, and then the hot air is discharged from the second communicating port 112 of each air duct structure 10, so that the hot air rises, thereby facilitating the air flow circulation of the air and avoiding the technical problem of poor comfort caused by heat stratification.

When the volute tongue 12 is in the second blocking position and the duct baffle 20 is in the blocking position, the airflow enters the air inlet 113 from the second side of the volute casing 11. At this time, the indoor unit of the air conditioner is in a cooling mode. That is, when the volute tongue 12 is at the second blocking position, the cold air flows into the air inlet 113 of each air duct structure 10 from the gap between the plurality of air duct structures 10, that is, enters the air inlet 113 from the second side of the volute casing 11, and then the cold air is discharged from the first communication port 111 of each air duct structure 10, so that the cold air descends, thereby facilitating the air flow to circulate, and avoiding the technical problem of poor comfort caused by heat stratification.

In this embodiment, the indoor unit of an air conditioner further includes an evaporator assembly 30, and the evaporator assembly 30 is disposed opposite to the first communicating port 111 of the air duct structure 10, so that the air flow enters the air inlet 113 after exchanging heat through the evaporator assembly 30, or the air flow flows out from the first communicating port 111 and exchanges heat through the evaporator assembly 30. By adopting the arrangement, the heat exchange efficiency can be improved, and the comfort level of indoor air is better improved.

In this embodiment, the number of the air duct structures 10 in this embodiment is two, and the air inlet 113 of one air duct structure 10 is disposed opposite to the air inlet 113 of the other air duct structure 10. Specifically, the two air duct structures 10 are arranged at intervals, and the air flow flows into the air inlet 113 from the first side or the second side of the two air duct structures 10 after flowing into the gap between the two air duct structures 10, that is, the air flow flows into the air inlet 113 from the upper side or the lower side of the two air duct structures 10 after flowing into the gap between the two air duct structures 10, so as to better supply air.

Specifically, the air duct baffle 20 in this embodiment is rotatably disposed between two air duct structures 10, so that the air duct baffle 20 rotates to the shielding position or the avoiding position. Specifically, the air duct baffle 20 is rotatably disposed at a gap between the two air duct structures 10, and when the air duct baffle 20 is located at the shielding position, the air duct baffle 20 completely covers the gap between the two air duct structures 10 to avoid air leakage.

In this embodiment, the indoor unit of the air conditioner further includes a first evaporator 31 and a second evaporator 32, and the first evaporator 31 is disposed opposite to the first communication port 111 of one air duct structure 10. The second evaporator 32 is connected to the first evaporator 31, and the second evaporator 32 is disposed opposite to the first communication port 111 of the other air duct structure 10. By adopting the arrangement, the heat exchange efficiency can be better improved, and the comfort level of indoor air is better improved.

Specifically, the first evaporator 31 and the second evaporator 32 in the present embodiment are disposed at a predetermined angle to form a V-shaped structure. By adopting the arrangement, the heat exchange area of the heat exchanger can be enlarged, and the heat exchange efficiency of the indoor unit of the air conditioner is improved.

Specifically, the volute tongue 12 in the present embodiment is rotatably disposed on the volute casing 11, so that the volute tongue 12 rotates to the first blocking position or the second blocking position. With this arrangement, it is possible to facilitate the smooth movement of the volute tongue 12 to the first blocking position or the second blocking position, so as to improve the stability of the movement.

In order to improve the smoothness of the rotation of the volute tongue 12, a guide groove is arranged on the volute casing 11, and the volute tongue 12 is rotatably arranged in the guide groove. Specifically, the guiding groove is an arc-shaped groove.

In this embodiment, the indoor unit of an air conditioner further includes a driving component, and a driving end of the driving component is in driving connection with the volute tongue 12 so as to drive the volute tongue 12 to rotate through the driving component. By adopting the arrangement, the automation degree of the whole structure can be conveniently improved.

In the present embodiment, the driving assembly includes a motor 41, a first gear 42, and a second gear 43. The first gear 42 is connected to an output shaft of the motor 41 to rotate the first gear 42 via the motor 41. The second gear 43 is arranged on the worm tongue 12, the second gear 43 is in an annular structure, and the second gear 43 forms a driving end of the driving assembly so as to drive the worm tongue 12 to rotate through the second gear 43. With this arrangement, the first gear 42 and the second gear 43 can stably drive the worm tongue 12 to rotate.

In the present embodiment, the volute tongue 12 is a circular ring structure, and the circular ring structure is provided with an air outlet, and when the volute tongue 12 rotates to the first blocking position, the air outlet is opposite to the second communicating opening 112. When the volute tongue 12 rotates to the second blocking position, the air outlet is opposite to the first communication opening 111. With this arrangement, rotation of the volute tongue 12 to the first blocking position or the second blocking position can be facilitated.

In this embodiment, the air conditioning indoor unit further includes an indoor unit casing 50, the indoor unit casing 50 is provided with a first air opening 51 and a second air opening 52, the first air opening 51 and the second air opening 52 are arranged at intervals, and the first air opening 51 and the second air opening 52 are arranged at intervals along the extending direction of the indoor unit casing 50. The air duct structure 10 is disposed in the indoor unit casing 50, and the air duct structure 10 is located between the first air opening 51 and the second air opening 52, so that the air flow is introduced from the first air opening 51 and then blown out from the second air opening 52 under the action of the air duct structure 10, or the air flow is introduced from the second air opening 52 and then blown out from the first air opening 51 under the action of the air duct structure 10. Specifically, when the air-conditioning indoor unit is in a heating mode, airflow is introduced into the second air opening 52 from the first air opening 51 under the action of the air duct structure 10 and is blown out, and the air-conditioning indoor unit is an upward return air; when the indoor unit of the air conditioner is in a cooling mode, airflow is introduced into the first air opening 51 from the second air opening 52 under the action of the air duct structure 10, and the air conditioner is downward return air. The arrangement is adopted to facilitate the flow of the air flow, so as to better improve the comfort level of indoor air.

The air conditioning indoor unit in this embodiment includes a top cover 60 and a bottom plate 70, and the top cover 60 and the bottom plate 70 are oppositely disposed on two sides of the indoor unit casing 50, so as to protect the indoor unit casing 50 through the top cover 60 and the bottom plate 70.

From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects: the air conditioner indoor unit is convenient to select a corresponding air port for air outlet according to a refrigeration mode or a heating mode of the air conditioner indoor unit, and different air outlet functions can be selected, so that up-down convection is realized, the distribution of an indoor temperature field is optimized, the comfort of the air conditioner indoor unit is improved, and the utilization efficiency of energy is improved.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present application; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of protection of the present application is not to be construed as being limited.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An indoor unit of an air conditioner, comprising:

the air duct structure comprises a plurality of air duct structures (10), wherein the air duct structures (10) are arranged at intervals; the air duct structure (10) comprises a volute (11) and a volute tongue (12), a first communication port (111), a second communication port (112) and an air inlet (113) are formed in the volute (11), the first communication port (111) and the second communication port (112) are both used for being communicated with the air inlet (113), the first communication port (111) is arranged on a first side of the volute (11), and the second communication port (112) is arranged on a second side of the volute (11); the volute tongue (12) is movably arranged on the volute casing (11) so that the volute tongue (12) has a first blocking position blocking the first communication opening (111) and a second blocking position blocking the second communication opening (112);

the air channel baffle (20) is movably arranged on the first side of the volute (11), and the air channel baffle (20) is provided with a shielding position for shielding gaps among the air channel structures (10) and an avoiding position for avoiding the gaps among the air channel structures (10);

when the volute tongue (12) is in the first blocking position, the air duct baffle (20) is in the avoiding position, so that the air flow enters the air inlet (113) from the first side of the volute casing (11); when the volute tongue (12) is in the second blocking position, the air duct baffle (20) is in the blocking position, so that the air flow enters the air inlet (113) from the second side of the volute casing (11).

2. An indoor unit of an air conditioner according to claim 1, further comprising:

evaporator assembly (30), with first intercommunication mouth (111) of wind channel structure (10) set up relatively to make the air current pass through get into behind evaporator assembly (30) heat transfer in air intake (113), or make the air current by behind first intercommunication mouth (111) the outflow pass through evaporator assembly (30) carry out the heat transfer.

3. The indoor unit of air conditioner as claimed in claim 1, wherein the number of the air duct structures (10) is two, and the air inlet (113) of one air duct structure (10) is opposite to the air inlet (113) of the other air duct structure (10).

4. The indoor unit of air conditioner according to claim 3, wherein the air duct baffle (20) is rotatably disposed between the two air duct structures (10) to rotate the air duct baffle (20) to the shielding position or the avoiding position.

5. An indoor unit of an air conditioner according to claim 3, further comprising:

a first evaporator (31), wherein the first evaporator (31) is arranged opposite to a first communication opening (111) of the air duct structure (10);

and the second evaporator (32) is connected with the first evaporator (31), and the second evaporator (32) is arranged opposite to the first communication port (111) of the other air channel structure (10).

6. The indoor unit of air conditioner according to claim 5, wherein the first evaporator (31) and the second evaporator (32) are connected at a predetermined angle to form a V-shaped structure.

7. The indoor unit of air conditioner according to claim 1, wherein the volute tongue (12) is rotatably provided on the volute (11) to rotate the volute tongue (12) to the first blocking position or the second blocking position.

8. An indoor unit of an air conditioner according to claim 7, further comprising:

the driving end of the driving component is in driving connection with the volute tongue (12) so as to drive the volute tongue (12) to rotate through the driving component.

9. An indoor unit of an air conditioner according to claim 8, wherein the driving unit includes:

a motor (41);

the first gear (42) is connected with an output shaft of the motor (41) so as to drive the first gear (42) to rotate through the motor (41);

the second gear (43) is arranged on the volute tongue (12), and the second gear (43) forms a driving end of the driving component so as to drive the volute tongue (12) to rotate through the second gear (43).

10. The indoor unit of claim 7, wherein the volute tongue (12) is of a circular ring structure, and an air outlet is formed in the circular ring structure and is opposite to the second communication port (112) when the volute tongue (12) rotates to the first blocking position; when the volute tongue (12) rotates to the second blocking position, the air outlet is opposite to the first communication opening (111).

11. An indoor unit of an air conditioner according to claim 1, further comprising:

the air conditioner comprises an indoor unit shell (50), wherein a first air opening (51) and a second air opening (52) are formed in the indoor unit shell (50), and the first air opening (51) and the second air opening (52) are arranged at intervals; the air duct structure (10) is arranged in the indoor unit shell (50), and the air duct structure (10) is located between the first air opening (51) and the second air opening (52), so that air flow is introduced from the first air opening (51) under the action of the air duct structure (10) and then blown out from the second air opening (52), or air flow is introduced from the second air opening (52) under the action of the air duct structure (10) and then blown out from the first air opening (51).