Air duct structure and air conditioner

Abstract

An air duct is arranged in the air duct structure, the air duct comprises an air inlet section and an air outlet section, the air inlet section is suitable for being provided with a wind wheel, the air outlet section comprises a first diffusion section and a second diffusion section, the first diffusion section is communicated between the air inlet section and the second diffusion section, and the first diffusion section is communicated with the second diffusion section on the cross section perpendicular to the axial direction of the air inlet section. The width of the air outlet section is increased in the airflow direction, the two side walls, in the width direction, of the first diffusion section extend towards the same side of the width of the air outlet section, and the two side walls, in the width direction, of the second diffusion section extend away from each other in the direction away from the first diffusion section. Therefore, the air supply area and the air volume of the air duct structure can be considered.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning technology, and in particular to a duct structure and an air conditioner. Background Technology

[0002] Air supply equipment, such as air conditioners, uses artificial means to partially or completely regulate the temperature, humidity, flow rate, and cleanliness of air in a closed space to make the air parameters of the target environment meet the requirements. They are usually equipped with a fan to deliver air. However, air conditioners are difficult to balance in terms of air supply area and air volume, which limits their usability. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a duct structure that can balance air delivery area and air volume.

[0004] This utility model also proposes an air conditioner having the above-mentioned air duct structure.

[0005] According to a first aspect embodiment of the present invention, the air duct structure includes an air duct, which includes an air inlet section and an air outlet section. The air inlet section is adapted to be equipped with a fan wheel, and the air outlet section includes a first diffuser section and a second diffuser section. The first diffuser section connects the air inlet section and the second diffuser section. In a cross-section perpendicular to the axial direction of the air inlet section, the width of the air outlet section increases along the airflow direction, and the two side walls of the first diffuser section in the width direction extend to the same side of the width of the air outlet section. The two side walls of the second diffuser section in the width direction extend away from each other in a direction away from the first diffuser section.

[0006] According to the duct structure of this utility model embodiment, both the first diffuser section and the second diffuser section have a certain diffuser capacity, so that the airflow discharged from the impeller can be diffused multiple times through the first diffuser section and the second diffuser section in sequence. This is beneficial to further increase the static pressure value at the outlet of the duct structure to a certain extent, thereby improving the airflow of the duct structure and achieving a suitable air delivery distance. Moreover, since the second diffuser section is located downstream of the first diffuser section, the width of the downstream end of the second diffuser section is greater than the width of the downstream end of the first diffuser section, which is beneficial to expanding the air delivery area and air delivery range of the duct structure.

[0007] In some embodiments, the two side walls of the first diffuser section in the width direction are respectively a first air duct wall and a second air duct wall, and the two side walls of the second diffuser section in the width direction are respectively a third air duct wall and a fourth air duct wall. The third air duct wall is connected to the first air duct wall, and the fourth air duct wall is connected to the second air duct wall. The extension direction of the fourth air duct wall is different from the extension direction of the second air duct wall. In a cross-section perpendicular to the axial direction of the air inlet section, the line connecting the two ends in the extension direction of the first air duct wall is the first connecting line, the line connecting the two ends in the extension direction of the second air duct wall is the second connecting line, the line connecting the two ends in the extension direction of the third air duct wall is the third connecting line, and the line connecting the two ends in the extension direction of the fourth air duct wall is the fourth connecting line. The ratio of the length of the third connecting line to the length of the first connecting line is greater than or equal to 0.4 and less than or equal to 0.6; and / or, the ratio of the length of the fourth connecting line to the length of the second connecting line is greater than or equal to 0.4 and less than or equal to 0.6.

[0008] In some embodiments, the two side walls of the first diffuser section in the width direction are respectively the first air duct wall and the second air duct wall, and in a cross section perpendicular to the axial direction of the air inlet section, the included angle between the first air duct wall and the second air duct wall is greater than or equal to 10° and less than or equal to 20°.

[0009] In some embodiments, the ratio of the width of the outlet of the second diffuser section to the width of the inlet of the second diffuser section is greater than or equal to 1.1 and less than or equal to 1.7.

[0010] In some embodiments, the air duct is a cross-flow air duct, the air duct structure has a volute tongue, and the upstream end of the first diffuser section is located at the location of the volute tongue.

[0011] In some embodiments, the two side walls of the second diffuser section in the width direction are respectively the third air duct wall and the fourth air duct wall. In a cross-section perpendicular to the axial direction of the air inlet section, the extension direction of the third air duct wall is consistent with the extension direction of the first diffuser section, and the third air duct wall includes a first convex section. The first convex section protrudes outward from the third connecting line and is directly connected to the first air duct wall of the first diffuser section. The third connecting line is the line connecting the two ends in the extension direction of the third air duct wall. The first convex section spans both sides of the midpoint of the third connecting line, and the maximum protrusion height of the first convex section is located on the side of the midpoint away from the first diffuser section.

[0012] In some embodiments, the length of the projection of the first convex segment onto the third connecting line exceeds half the length of the third connecting line.

[0013] In some embodiments, the maximum height of the first convex segment protruding beyond the third connecting line is greater than or equal to 25 mm and less than or equal to 35 mm.

[0014] In some embodiments, the two side walls of the first diffuser section in the width direction are respectively the first air duct wall and the second air duct wall, the third air duct wall corresponds to the first air duct wall, the first convex section includes a first segment and a second segment, the first segment is connected between the first air duct wall and the second segment, the maximum protrusion height of the first convex section is located at the connection position of the first segment and the second segment, the angle between the first segment and the first air duct wall is an obtuse angle, the angle between the first segment and the second segment is an obtuse angle, and the angle between the second segment and the second air duct wall is smaller than the angle between the first air duct wall and the second air duct wall.

[0015] In some embodiments, in a cross-section perpendicular to the axial direction of the air inlet section, the third duct wall further includes a straight section extending in a straight line, the straight section being connected to the end of the first convex section away from the first diffuser section.

[0016] In some embodiments, the straight segment is tangentially connected to the first convex segment.

[0017] In some embodiments, the ratio of the length of the projection of the straight segment onto the third connecting line to the length of the projection of the first convex segment onto the third connecting line is greater than or equal to 0.1 and less than or equal to 0.2.

[0018] In some embodiments, the two side walls of the second diffuser section in the width direction are respectively the third air duct wall and the fourth air duct wall. In a cross-section perpendicular to the axial direction of the air inlet section, the extension direction of the fourth air duct wall is different from the extension direction of the first diffuser section, and the fourth air duct wall includes a recessed section and a second convex section. The recessed section is connected between the second air duct wall of the first diffuser section and the second convex section. The recessed section is concave to the fourth connecting line, and the second convex section is convex to the fourth connecting line. The fourth connecting line is the line connecting the two ends in the extension direction of the fourth air duct wall.

[0019] In some embodiments, the two ends of the recessed section are smoothly connected to the second air duct wall and the second convex section, respectively.

[0020] In some embodiments, the fourth duct wall is configured to satisfy at least one of the following conditions: the ratio of the length of the projection of the recessed segment onto the fourth connecting line to the length of the projection of the second convex segment onto the fourth connecting line is greater than or equal to 0.4 and less than or equal to 0.5; the maximum depth of the recessed segment recessed into the fourth connecting line is greater than or equal to 2 mm and less than or equal to 6 mm; the maximum height of the second convex segment protruding from the fourth connecting line is greater than or equal to 2 mm and less than or equal to 6 mm.

[0021] In some embodiments, the two side walls of the first diffuser section in the width direction are respectively a first air duct wall and a second air duct wall, and the two side walls of the second diffuser section in the width direction are respectively a third air duct wall and a fourth air duct wall. The air duct structure is configured to satisfy at least one of the following conditions: the third air duct wall is integrally connected to the first air duct wall; the fourth air duct wall is integrally connected to the second air duct wall; the third air duct wall and the first air duct wall are smoothly connected; the fourth air duct wall and the second air duct wall are smoothly connected.

[0022] An air conditioner according to a second aspect of the present invention includes: a housing having an air outlet; an air duct structure, the air duct structure being the same as that described in the first aspect of the present invention, the air duct structure being disposed within the housing, and the two side walls of the air outlet section extending to both sides of the width of the air outlet; and a fan wheel disposed within the housing and located in the air inlet section, the axial direction of the air inlet section being parallel to the axial direction of the fan wheel.

[0023] The air conditioner according to the present invention, by adopting the above-described air duct structure, is beneficial to balance the air supply range and air volume.

[0024] In some embodiments, the impeller is a cross-flow impeller, and the two side walls of the first diffuser section in the width direction are respectively the first air duct wall and the second air duct wall. In a cross section perpendicular to the axial direction of the air inlet section, the line connecting the two ends of the first air duct wall in the extension direction is the first connecting line, and the line connecting the two ends of the second air duct wall in the extension direction is the second connecting line. The ratio of the length of the first connecting line to the diameter of the cross-flow impeller is greater than or equal to 1 and less than or equal to 1.5, and the ratio of the length of the second connecting line to the diameter of the cross-flow impeller is greater than or equal to 0.8 and less than or equal to 1.2.

[0025] In some embodiments, the impeller is a cross-flow impeller, the air outlet is located on the front side of the casing, the axial direction of the impeller is vertical, and the width direction of the air outlet section is horizontal. The air conditioner further includes an air outlet grille, which is disposed at the air outlet. The width of the air outlet in the horizontal direction is greater than or equal to 80% of the width of the air conditioner in the horizontal direction. The air outlet grille includes a plurality of horizontal bars and a plurality of vertical bars. The plurality of horizontal bars are arranged vertically at intervals, and each horizontal bar extends horizontally. The plurality of vertical bars are arranged horizontally at intervals, and each vertical bar extends vertically. The horizontal spacing of the vertical grid bars is less than 1 / 3 of the vertical spacing of the adjacent horizontal grid bars, and the vertical grid bars protrude from the front side of the horizontal grid bars; a first air guide component, the first air guide component including a first air guide plate, the first air guide plate being disposed in the second diffuser section and rotatable about a vertical axis extending vertically; a second air guide component, the second air guide component including a second air guide plate at least mostly disposed in the first diffuser section, the second air guide plate being rotatable about a horizontal axis extending horizontally; a protective net, the protective net being disposed in the second diffuser section, and located upstream of the first air guide plate and downstream of the second air guide plate.

[0026] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0027] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0028] Figure 1 This is a cross-sectional view of an air conditioner according to some embodiments of the present invention;

[0029] Figure 2 yes Figure 1 A partial schematic diagram of the air outlet structure shown;

[0030] Figure 3 yes Figure 1 Another schematic diagram of the air outlet structure shown;

[0031] Figure 4 This is a cross-sectional view of an air conditioner according to some embodiments of the present invention;

[0032] Figure 5 This is a schematic diagram of an air conditioner according to some embodiments of the present invention;

[0033] Figure 6 yes Figure 5 Another schematic diagram of the air conditioner shown;

[0034] Figure 7 yes Figure 5 The exploded view of the air conditioner shown;

[0035] Figure 8 yes Figure 7 A cross-sectional view of the air vent grille shown;

[0036] Figure 9 yes Figure 8 A partial schematic diagram of the air vent grille shown;

[0037] Figure 10 This is a cross-sectional view of an air conditioner according to some embodiments of the present invention;

[0038] Figure 11 yes Figure 10 A partial schematic diagram of the air conditioner shown.

[0039] Figure label:

[0040] Air conditioner 200, housing 101, air outlet 101a, impeller 102, air outlet grille 103, horizontal grille 1032, vertical grille 1031, first air guide component 104, first air guide plate 1041, second air guide component 105, second air guide plate 1051, connecting rod 1052, protective net 106, display module 107, rear housing 1081, top cover 1082, base 1083.

[0041] Air duct structure 100

[0042] Air duct 1, air inlet section 11, fifth air duct wall 111, sixth air duct wall 112, air outlet section 12.

[0043] First diffuser section 121, first air duct wall 1211, second air duct wall 1212

[0044] Second diffuser section 122, third duct wall 1221, first convex section 1221a, straight section 1221b, first section 1221c, second section 1221d, fourth duct wall 1222, concave section 1222a, second convex section 1222b

[0045] 2. Snail shell. Detailed Implementation

[0046] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0047] The following disclosure provides numerous different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0048] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0049] Hereinafter, with reference to the accompanying drawings, a duct structure 100 according to an embodiment of the present invention will be described. It will be understood that the duct structure 100 can be used in air supply equipment, such as air purifiers, air conditioners 200, etc. In the following description of this application, the duct structure 100 used in an air conditioner 200 will be used as an example. Those skilled in the art will readily understand, after reading the following description, implementation schemes for using the duct structure 100 in other types of air supply equipment.

[0050] like Figure 1 As shown, the air duct structure 100 has an air duct 1, which includes an air inlet section 11 and an air outlet section 12. The air inlet section 11 is suitable for mounting a fan wheel 102. On the cross-section perpendicular to the axial direction of the air inlet section 11, the width of the air outlet section 12 (for example, the left and right direction in the figure is the width direction) increases along the airflow direction so that the flow area of ​​the air outlet section 12 increases along the airflow direction, so that the air outlet section 12 has a certain diffusion capacity to increase the static pressure value at the outlet of the air outlet section 12, so that the air duct structure 100 can achieve a certain air delivery distance. Moreover, the air outlet section 12 can guide the airflow on the air outlet side of the fan wheel 102 to a certain extent, so that the airflow can diffuse smoothly and reduce the energy loss caused by turbulence and eddy current intensity to a certain extent.

[0051] The air outlet section 12 includes a first diffuser section 121 and a second diffuser section 122. The first diffuser section 121 is connected between the air inlet section 11 and the second diffuser section 122. When the air duct structure 100 is in use, the impeller 102 is placed in the air inlet section 11. The impeller 102 rotates to drive the airflow. The airflow enters the air duct 1 from the air inlet section 11 and flows through the first diffuser section 121 and the second diffuser section 122 in sequence before being discharged. Since the width of the outlet section 12 increases along the airflow direction, the width of the first diffuser section 121 also increases along the airflow direction. The width of the second diffuser section 122 can also be increased accordingly along the airflow direction, so that both the first diffuser section 121 and the second diffuser section 122 have a certain diffuser capacity. This allows the airflow discharged from the impeller 102 to be diffused multiple times through the first diffuser section 121 and the second diffuser section 122, which is beneficial to further increase the static pressure value at the outlet of the duct structure 100 to a certain extent. This is beneficial to increase the airflow of the duct structure 100 and achieve a suitable air delivery distance. Moreover, since the second diffuser section 122 is located downstream of the first diffuser section 121, the width of the downstream end of the second diffuser section 122 is greater than the width of the downstream end of the first diffuser section 121, which is beneficial to expand the air delivery area and air delivery range of the duct structure 100.

[0052] In the cross-section perpendicular to the axial direction of the inlet section 11, the two side walls of the first diffuser section 121 extend towards the same side of the outlet section 12 in the width direction, while the two side walls of the second diffuser section 122 extend away from each other in the width direction away from the first diffuser section 121. The extension directions of the first diffuser section 121 and the second diffuser section 122 can be understood as extension directions along the airflow direction.

[0053] It is understood that in the above configuration, the diffusion angle of the first diffusion section 121 can be smaller than the diffusion angle of the second diffusion section 122, so that the second diffusion section 122 can further diffuse the airflow flowing out of the first diffusion section 121.

[0054] For example, the two side walls of the first diffuser section 121 in the width direction are a first air duct wall 1211 and a second air duct wall 1212, respectively. The distance between the first air duct wall 1211 and the second air duct wall 1212 in the width direction of the outlet section 12 is the width of the first diffuser section 121. The two side walls of the second diffuser section 122 in the width direction are a third air duct wall 1221 and a fourth air duct wall 1222, respectively. The distance between the third air duct wall 1221 and the fourth air duct wall 1222 in the width direction of the outlet section 12 is the width of the second diffuser section 122. The third air duct wall 1221 is connected to the first air duct wall 1211. The fourth duct wall 1222 is connected to the second duct wall 1212. Taking the axial direction of the air inlet section 11 as the vertical direction and the width direction of the air outlet section 12 as the horizontal direction as an example, on the horizontally set cross section, along the airflow direction, the first duct wall 1211 and the second duct wall 1212 both extend to the left, the third duct wall 1221 extends to the left, and the fourth duct wall 1222 extends to the right. Of course, in other examples, on the horizontally set cross section, along the airflow direction, the first duct wall 1211 and the second duct wall 1212 both extend to the right, the third duct wall 1221 extends to the right, and the fourth duct wall 1222 extends to the left.

[0055] Therefore, the second diffuser section 122 is designed to make fuller use of the space downstream of the air outlet section 12, so that the duct structure 100 can provide a larger air outlet area at its outlet. At the same time, it helps to prevent the air outlet position of the duct structure 100 from deviating excessively from the center plane of the air conditioner 200, so as to take into account the air outlets on both sides of the center plane of the air conditioner 200.

[0056] It can be understood that if the axial direction of the air inlet section 11 is parallel to the axial direction of the impeller 102 located in the air inlet section 11, then the aforementioned cross section is perpendicular to the axial direction of the impeller 102. The width of the air outlet section 12 increases along the airflow direction, meaning that the width of the air outlet section 12 has an increasing trend along the airflow direction. Whether this increasing trend is linear or non-linear is not specifically limited in this embodiment. Similarly, the increasing trend of the width of the first diffuser section 121 along the airflow direction, and the increasing area of ​​the width of the second diffuser section 122 along the airflow direction, are not specifically limited in this embodiment, as long as both the first diffuser section 121 and the second diffuser section 122 can perform a diffuser function.

[0057] According to the duct structure 100 of this utility model embodiment, both the first diffuser section 121 and the second diffuser section 122 have a certain diffuser capacity, so that the airflow discharged from the impeller 102 can be diffused multiple times through the first diffuser section 121 and the second diffuser section 122 in sequence. This is beneficial to further increase the static pressure value at the outlet of the duct structure 100 to a certain extent, thereby increasing the airflow of the duct structure 100 and achieving a suitable air delivery distance. Moreover, since the second diffuser section 122 is located downstream of the first diffuser section 121, the width of the downstream end of the second diffuser section 122 is greater than the width of the downstream end of the first diffuser section 121, which is beneficial to expand the air delivery area and air delivery range of the duct structure 100.

[0058] In some embodiments, such as Figures 1-3 As shown, the first diffuser section 121 has two side walls in the width direction, namely the first air duct wall 1211 and the second air duct wall 1212. The second diffuser section 122 has two side walls in the width direction, namely the third air duct wall 1221 and the fourth air duct wall 1222. The third air duct wall 1221 is connected to the first air duct wall 1211, and the fourth air duct wall 1222 is connected to the second air duct wall 1212. The extension direction of the fourth air duct wall 1222 is different from the extension direction of the second air duct wall 1212. The extension direction of the duct wall 1221 is the same as the extension direction of the first air duct wall 1211; on the cross section perpendicular to the axial direction of the air inlet section 11, the line connecting the two ends in the extension direction of the first air duct wall 1211 is the first connecting line L1, the line connecting the two ends in the extension direction of the second air duct wall 1212 is the second connecting line L2, the line connecting the two ends in the extension direction of the third air duct wall 1221 is the third connecting line L3, and the line connecting the two ends in the extension direction of the fourth air duct wall 1222 is the fourth connecting line L4.

[0059] Specifically, the ratio of the length C1 of the third connection L3 to the length B1 of the first connection L1 is greater than or equal to 0.4 and less than or equal to 0.6, i.e., 0.4 ≤ C1 / B1 ≤ 0.6. For example, C1 / B1 can be 0.4, 0.43, 0.45, 0.48, 0.5, 0.52, 0.56, 0.59, or 0.6, etc.; and / or, the ratio of the length C2 of the fourth connection L4 to the length B2 of the second connection L2 is greater than or equal to 0.4 and less than or equal to 0.6, i.e., 0.4 ≤ C2 / B2 ≤ 0.6. For example, C2 / B2 can be 0.4, 0.42, 0.45, 0.48, 0.5, 0.52, 0.55, 0.58, or 0.6, etc.

[0060] Therefore, the length of the corresponding duct wall of the second diffuser section 122 is set based on the length of the corresponding duct wall of the first diffuser section 121, so that the second diffuser section 122 can better match the first diffuser section 121, and the second diffuser section 122 can better diffuse the airflow from the first diffuser section 121. At the same time, in the overall extension direction of the outlet section 12, the length of the second diffuser section 122 will not be too large, which would easily increase the length of the duct structure 100 and the space occupied by the outlet duct 1, and also increase the outlet path of the outlet section 12 and increase the outlet resistance. The length of the second diffuser section 122 will not be too short, which would easily limit the improvement of static pressure. At the same time, under the same outlet area, if the diffusion angle of the second diffuser section 122 is too large, the airflow will easily separate from the duct wall, and vortices will easily form in the airflow separation area.

[0061] It is understood that in the embodiments of this application, the first connection, the second connection, the third connection and the fourth connection can be understood as the connection between the two ends of the part of the corresponding air duct wall that participates in air supply when the air duct structure 100 is used in the air conditioner 200.

[0062] In some embodiments, such as Figures 1-3 As shown, the two side walls of the first diffuser section 121 in the width direction are the first air duct wall 1211 and the second air duct wall 1212, respectively. The two side walls of the second diffuser section 122 in the width direction are the third air duct wall 1221 and the fourth air duct wall 1222, respectively. In the cross-section perpendicular to the axial direction of the air inlet section 11, the included angle α between the first air duct wall 1211 and the second air duct wall 1212 is greater than or equal to 10° and less than or equal to 20°, i.e., 10°≤α≤20°. Thus, the first air duct wall 1211 and the second air duct wall 1212 have a suitable included angle, which improves the situation where the airflow is prone to detaching from the air duct wall and forming vortices due to an excessively large included angle. At the same time, it improves the situation where the included angle is too small and a longer first diffuser section 121 is required, so that the first diffuser section 121 has a suitable diffuser path length while ensuring that the first diffuser section 121 has a suitable diffuser effect.

[0063] In some embodiments, such as Figures 1-3 As shown, the ratio of the width X3 at the outlet of the second diffuser section 122 to the width X2 at the inlet of the second diffuser section 122 is greater than or equal to 1.1 and less than or equal to 1.7, i.e., 1.1 ≤ X3 / X2 ≤ 1.7. For example, X3 / X2 can be 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, or 1.7, etc. It can be understood that if the above ratio is too large, the airflow is prone to separation in the second diffuser section 122, and vortices and aerodynamic noise are easily generated in the splitting zone. If the above ratio is too small, the diffusion effect is easily limited.

[0064] In some embodiments, such as Figures 1-3As shown, the air duct 1 is a cross-flow air duct, and the air inlet section 11 is suitable for installing a cross-flow impeller. The air duct structure 100 has a volute tongue 2, and the upstream end of the first diffuser section 121 is located at the position of the volute tongue 2. At this time, in the cross section perpendicular to the axial direction of the air inlet section 11, the two opposite side walls of the air inlet section 11 are the fifth air duct wall 111 and the sixth air duct wall 112, respectively. The fifth air duct wall 111 is connected to the air duct wall of the air outlet section 12 (e.g., the first air duct wall 1211 of the first diffuser section 121) to define the volute tongue 2. Then, both side walls of the first diffuser section 121 in the width direction extend toward the side where the volute tongue 2 is located, and the sixth air duct wall 112 is formed into an arc shape.

[0065] For example, the width direction of the air outlet section 12 is the left and right direction, the volute tongue 2 is located on the left side of the air duct 1, and along the airflow direction, both side walls of the first diffuser section 121 extend to the left in the left and right direction.

[0066] In some embodiments, such as Figures 1-3 As shown, the two side walls of the second diffuser section 122 in the width direction are the third air duct wall 1221 and the fourth air duct wall 1222, respectively. In the cross section perpendicular to the axial direction of the air inlet section 11, the extension direction of the third air duct wall 1221 is consistent with the extension direction of the first diffuser section 121. For example, the air duct 1 is a cross-flow air duct. In the width direction of the air outlet section 12, the third air duct wall 1221 can be located on the same side as the volute tongue of the air duct structure 100.

[0067] In the cross-section perpendicular to the axial direction of the air inlet section 11, the third air duct wall 1221 includes a first protruding section 1221a. The first protruding section 1221a protrudes outward from the third connecting line L3. The first protruding section 1221a is directly connected to the first air duct wall 1211 of the first diffuser section 121. The third connecting line L3 is the line connecting the two ends in the extension direction of the third air duct wall 1221. The first protruding section 1221a spans both sides of the midpoint O of the third connecting line L3, and the maximum protrusion height of the first protruding section 1221a is located on the side of the midpoint O facing the first diffuser section 121. It can be understood that the first convex segment 1221a spans both sides of the midpoint O of the third connecting line L3 in the extending direction of the third connecting line L3. Therefore, part of the projection of the first convex segment 1221a onto the third connecting line L3 is located on one side of the midpoint O, and the other part is located on the other side of the midpoint O. Furthermore, the projection of the maximum protrusion height of the first convex segment 1221a onto the third connecting line L3 is located on the side of the midpoint O away from the first diffuser segment 121. It can also be understood that the first convex segment 1221a protrudes in a direction away from the central axis of the air outlet segment 12.

[0068] For example, taking the axial direction of the air inlet section 11 as the up-down direction and the width direction of the air outlet section 12 as the left-right direction, on the horizontally set cross section, the third connecting line L3 is the connecting line between the two ends of the third air duct wall 1221 in the front-back direction.

[0069] Therefore, the outward protrusion of the first outward protrusion 1221a and the setting of its maximum protrusion height facilitate a significant change in the airflow area at the second diffuser 122 or at the connection between the first diffuser 121 and the second diffuser 122. Moreover, the aforementioned change in airflow area has a relatively long airflow path, which facilitates better flow of some air along the third duct wall 1221, thereby increasing the air outlet range under the guidance of the third duct wall 1221. In addition, the aforementioned setting of the first outward protrusion 1221a can also provide more space for the arrangement and / or movement of the air guide structure when an air guide structure (such as the first air guide component 104 described later) is set on the duct structure 100, which is beneficial to improving the guiding effect of the air guide structure on the airflow adjacent to the third duct wall 1221.

[0070] In some embodiments, such as Figures 1-3 As shown, the length C of the projection of the first convex segment 1221a onto the third connecting line L3 is... 11 The length C1 of the first convex segment 1221a exceeds half the length of the third connecting line L3. Therefore, with the same length of the third connecting line L3, the first convex segment 1221a has a larger proportion of length, allowing it to better guide the airflow within the second diffuser section 122 away from the fourth duct wall 1222, thereby further increasing the air outlet area and freeing up more space for other components. For example, the length C1 of the projection of the first convex segment 1221a onto the first connecting line L1 is... 11 The length of the third connection L3 is 0.6, 0.7, 0.8, 0.9, or 0.95 times the length C1.

[0071] In some embodiments, such as Figures 1-3 As shown, the maximum height T1 of the first convex segment 1221a protruding beyond the third connecting line L3 is greater than or equal to 25mm and less than or equal to 35mm, i.e., 25mm≤T1≤35mm. T1 can be understood as the distance between the maximum protrusion height of the first convex segment 1221a and the third connecting line L3. Therefore, by limiting the maximum protrusion height of the first convex segment 1221a, the problem of excessively large maximum protrusion height increasing the space occupied by the air duct structure 200 can be mitigated. It also helps to address the problem of insufficient maximum protrusion height of the first convex segment 1221a limiting the diffusion effect of the second diffusion segment 122. For example, T1 can be 25mm, 28mm, 3mm, 33mm, or 35mm, etc.

[0072] In some embodiments, such as Figures 1-3 As shown, the first diffuser section 121 has two side walls in the width direction, namely the first air duct wall 1211 and the second air duct wall 1212. The third air duct wall 1221 corresponds to the first air duct wall 1211. The first convex section 1221a includes a first segment 1221c and a second segment 1221d. The first segment 1221c connects the first air duct wall 1211 and the second segment 1221d. The maximum protrusion height of the first convex section 1221a is located at the connection position of the first segment 1221c and the second segment 1221d. The angle α1 between the first segment 1221c and the first air duct wall 1211 is an obtuse angle, and the angle α2 between the first segment 1221c and the second segment 1221d is an obtuse angle. The angle α3 between the second segment 1221d and the second air duct wall 1212 is smaller than the angle α between the first air duct wall 1211 and the second air duct wall 1212.

[0073] For example, taking the width direction of the air outlet section 12 as the left-right direction, the first air duct wall 1211 is located to the left of the second air duct wall 1212, and both the first air duct wall 1211 and the second air duct wall 1212 extend to the left along the airflow direction. It can be understood that, since the first diffuser section 121 has a diffuser effect, the degree to which the first air duct wall 1211 tilts to the left is greater than the degree to which the second air duct wall 1212 tilts to the left. The angle between the first section 1221c and the first air duct wall 1211 is an obtuse angle, and the third air duct wall 122... 1. If the first segment 1221c tilts to the left along the airflow direction, then the length of the first segment 1221c tilting to the left along the airflow direction is greater than the degree of tilting to the left of the first duct wall 1211. Since the angle between the first segment 1221c and the second segment 1221d is an obtuse angle, and the angle between the second segment 1221d and the second duct wall 1212 is smaller than the angle between the first duct wall 1211 and the second duct wall 1212, it is convenient to make the degree of tilting to the left of the second segment 1221d along the airflow direction less than the degree of tilting to the left of the first duct wall 1211.

[0074] Therefore, the above-mentioned arrangement of the third air duct wall 1221 facilitates the diffusion of the second diffusion section 122 while preventing the airflow of the second diffusion section 122 from separating or vortexing at the second section 1221d position, which is beneficial to improving the stability of airflow and reducing airflow noise.

[0075] In some embodiments, such as Figures 1-3As shown, in a cross-section perpendicular to the axial direction of the air inlet section 11, the third air duct wall 1221 also includes a straight section 1221b extending in a straight line. The straight section 1221b is connected to the end of the first convex section 1221a away from the first diffuser section 121. Thus, the airflow in the second diffuser section 122 first flows through the first convex section 1221a and then through the straight section 1221b. Therefore, the arrangement of the straight section 1221b facilitates the simplification of the structure of the third air duct wall 1221 while achieving the diffusion effect of the second diffuser section 122, making it easier to manufacture. Moreover, the arrangement of the straight section 1221b makes it less likely that the width of the second diffuser section 122 will be minimized at the connection point between the first convex section 1221a and the straight section 1221b, thus facilitating the increase in the width of the second diffuser section 122 along the airflow direction.

[0076] In some embodiments, such as Figures 1-3 As shown, the straight section 1221b is tangentially connected to the first convex section 1221a to achieve a smooth transition between the straight section 1221b and the first convex section 1221a. This facilitates a more stable and smooth flow of air within the second diffuser section 122, reducing losses and also helping to lower airflow noise.

[0077] In some embodiments, such as Figures 1-3 As shown, the length C of the projection of the straight segment 1221b onto the first connecting line L1 is... 12 The length C of the projection of the first convex segment 1221a onto the first connecting line L1 11 The ratio is greater than or equal to 0.1 and less than or equal to 0.2, where 0.1 ≤ C. 12 / C 11 ≤0.2. Therefore, the first convex segment 1221a occupies most of the extension length of the third air duct wall 1221, which is beneficial for improving the diffusion capacity of the second diffuser segment 122, and at the same time facilitates the simplification of the structure of the third air duct wall 1221, making it easier to process. For example, C 12 / C 11 It can be 0.1, 0.13, 0.15, 0.18, or 0.2, etc.

[0078] For example, such as Figures 1-3 As shown, C 11 +C 12 =C1.

[0079] In some embodiments, such as Figures 1-3As shown, the second diffuser section 122 has two side walls in the width direction, namely the third air duct wall 1221 and the fourth air duct wall 1222. In the cross section perpendicular to the axial direction of the air inlet section 11, the extension direction of the fourth air duct wall 1222 is different from the extension direction of the first diffuser section 121. The fourth air duct wall 1222 is bent and connected to the second air duct wall 1212 of the first diffuser section 121 so as to better utilize the space on both sides of the width of the air outlet section 12 and achieve a better diffuser effect on the air outlet of the first diffuser section 121. The fourth air duct wall 1222 includes a recessed section 1222a and a second convex section 1222b. The recessed section 1222a connects the second air duct wall 1212 of the first diffuser section 121 and the second convex section 1222b. The recessed section 1222a is recessed within the fourth connecting line L4, and the second convex section 1222b protrudes from the fourth connecting line L4. The fourth connecting line L4 is the line connecting the two ends of the fourth air duct wall 1222 in the extending direction. It can be understood that the recessed section 1222a is recessed towards the central axis of the air outlet section 12, and the second convex section 1222b protrudes towards the direction away from the central axis of the air outlet section 12.

[0080] For example, taking the axial direction of the air inlet section 11 as the up-down direction and the width direction of the air outlet section 12 as the left-right direction, on the horizontally set cross section, the fourth connecting line L4 is the connecting line between the two ends of the fourth air duct wall 1222 in the front-back direction.

[0081] Therefore, the recessed section 1222a facilitates a smoother transition between the fourth duct wall 1222 and the second duct wall 1212, improving the stability of the airflow from the first diffuser section 121 to the second diffuser section 122. The second convex section 1222b can adapt to improve the diffusion capacity of the second diffuser section 121, and can also achieve a smooth transition with the recessed section 1222a, which helps to reduce airflow noise.

[0082] In some embodiments, such as Figures 1-3 As shown, the two ends of the recessed section 1222a are smoothly connected to the second duct wall 1212 and the second convex section 1222b, respectively. This facilitates a smoother and more stable flow of air within the second diffuser section 122, reducing losses and noise. For example, one end of the recessed section 1222a is smoothly connected to the second duct wall 1212 via a rounded transition, while the other end of the recessed section 1222a is tangentially connected to the second convex section 1222b.

[0083] In some embodiments, such as Figures 1-3 As shown, the fourth air duct wall 1222 is constructed to satisfy at least one of the following conditions A1 to A3: Condition A1, the length C of the projection of the recessed segment 1222a onto the fourth connecting line L4. 21The length C of the projection of the second convex segment 1222b onto the fourth connecting line L4 22 The ratio is greater than or equal to 0.4 and less than or equal to 0.5, that is, 0.4 ≤ C. 21 / C 22 ≤0.5; Condition A2, the maximum depth T2 of the recessed section 1222a recessed within the fourth connecting line L4 is greater than or equal to 2mm and less than or equal to 6mm, i.e., 2mm≤T2≤6mm; Condition A3, the maximum height T3 of the second convex section 1222b protruding beyond the fourth connecting line L4 is greater than or equal to 2mm and less than or equal to 6mm, i.e., 2mm≤T3≤6mm. Therefore, the shape of the fourth duct wall 1221 is more rationally designed, facilitating smoother airflow along the fourth duct wall 1221 while ensuring the second diffusion section 122 diffuses the airflow, thus reducing noise and improving the air delivery performance of the duct structure 100. For example, C 21 / C 22 The thicknesses are 0.4, 0.42, 0.45, 0.47, or 0.5, etc.; T2 is 2mm, 3mm, 4mm, 5mm, or 6mm, etc.; and T3 is 2mm, 2.5mm, 3mm, 4mm, 4.5mm, 5mm, or 6mm, etc.

[0084] For example, such as Figures 1-3 As shown, C 21 +C 22 =C2.

[0085] In some embodiments, such as Figures 1-3As shown, the first diffuser section 121 has two side walls in the width direction, namely the first air duct wall 1211 and the second air duct wall 1212. The second diffuser section 122 has two side walls in the width direction, namely the third air duct wall 1221 and the fourth air duct wall 1222. The air duct structure 100 is configured to satisfy at least one of the following conditions B1 to B4: Condition B1: The third air duct wall 1221 is integrally connected to the first air duct wall 1211, which can save the assembly process between the third air duct wall 1221 and the first air duct wall 1211. Moreover, there is no gap between the third air duct wall 1221 and the first air duct wall 1211, no sealing is required, and there will be no air leakage problem, which is convenient to ensure the air volume; Condition B2: The fourth air duct wall 1222 is integrally connected to the second air duct wall 1212. This can save the assembly process between the fourth duct wall 1222 and the second duct wall 1212, and there is no gap between the fourth duct wall 1222 and the second duct wall 1212, no need for sealing, and no air leakage problem, which makes it easy to ensure the air volume; Condition B3, the smooth transition connection between the third duct wall 1221 and the first duct wall 1211 is conducive to the airflow in the first diffuser section 121 flowing more smoothly to the second diffuser section 122, which helps to reduce losses and also helps to reduce airflow noise; Condition B4, the smooth transition connection between the fourth duct wall 1222 and the second duct wall 1212 is conducive to the airflow in the first diffuser section 121 flowing more smoothly to the second diffuser section 122, which helps to reduce losses and also helps to reduce airflow noise.

[0086] For example, the air duct structure 100 is configured to satisfy condition B3, the third air duct wall 1221 includes a first convex section 1221a, the first convex section 1221a is smoothly connected to the first air duct wall 1211; the air duct structure 100 is configured to satisfy condition B4, the fourth air duct wall 1222 includes a concave section 1222a and a second convex section 1222b, the concave section 1222a is smoothly connected to the second air duct wall 1212.

[0087] In this embodiment, the first air duct wall 1211 can be an integral part or a separate part, and the second air duct wall 1212 can be an integral part or a separate part.

[0088] In this embodiment, the duct structure 100 has a secondary diffusion design. The duct undergoes a sudden expansion in the second diffusion section 122, which, compared to a single diffusion channel, increases the outlet pressure of the duct 1, thus reducing noise. With a single diffusion channel, increasing the airflow requires increasing the duct length, thus increasing the overall length. However, with a dual diffusion channel, this can be achieved without increasing the duct length.

[0089] According to the second aspect embodiment of the present utility model, the air conditioner 200, such as Figures 5-7As shown, it includes: a housing 101, an air duct structure 100, and a fan 102. The housing 101 has an air outlet 101a. The air duct structure 100 is the air duct structure 100 according to the first aspect embodiment of the present invention. The air duct structure 100 is disposed inside the housing 101, and the two side walls of the air outlet section 12 in the width direction extend to both sides of the width of the air outlet 101a. The fan 102 is disposed inside the housing 101, and the fan 102 is located in the air inlet section 11. The axial direction of the air inlet section 11 is parallel to the axial direction of the fan 102.

[0090] According to the embodiment of the present utility model, the air conditioner 200 adopts the above-mentioned air duct structure 100, which is beneficial to balance the air supply range and air volume, and improves the applicability of the air conditioner 200.

[0091] It is worth noting that the type of air conditioner 200 according to the embodiments of this application is not limited, and can be an integrated air conditioner or a split air conditioner. An integrated air conditioner may include a window air conditioner or a portable air conditioner, etc., and a split air conditioner may include a wall-mounted air conditioner or a floor-standing air conditioner, etc. Once the type of air conditioner 200 is determined, the shape of the air duct structure 100 and the distribution position of the air outlet 101a can be adaptively designed.

[0092] In some embodiments, the impeller 102 is a cross-flow impeller, and the two side walls of the first diffuser section 121 in the width direction are respectively the first air duct wall 1211 and the second air duct wall 1212. In a cross-section perpendicular to the axial direction of the air inlet section 11, the line connecting the two ends of the first air duct wall 1211 in the extension direction is the first connecting line L1, and the line connecting the two ends of the second air duct wall 1212 in the extension direction is the second connecting line L2. The ratio of the length B1 of the first connecting line L1 to the diameter D of the cross-flow impeller is greater than or equal to 1 and less than or equal to 1.5, and the ratio of the length B2 of the second connecting line L2 to the diameter of the cross-flow impeller is greater than or equal to 0.8 and less than or equal to 1.2. Therefore, the structural form of the first diffuser section 121 can achieve a better match with the air outlet of the cross-flow impeller, allowing the first diffuser section 121 to better diffuse the air outlet of the cross-flow impeller. For example, B1 / D can be 1, 1.2, 1.3, 1.4, or 1.5, etc., and B2 / D can be 0.8, 1, 1.1, or 1.2, etc.

[0093] In some embodiments, the impeller 102 is a cross-flow impeller, the air outlet 101a is located on the front side of the housing 101, the axial direction of the impeller 102 is up and down, and the width direction of the air outlet section 12 is left and right.

[0094] like Figure 4 and Figure 6As shown, the air conditioner 200 also includes an air outlet grille 103, which is located at the air outlet 101a. The width X4 of the air outlet 101a in the left-right direction is greater than or equal to 80% of the width W of the air conditioner 200 in the left-right direction. This indicates that the width of the air outlet 101a in the left-right direction is relatively large, allowing the air blown by the cross-flow fan 102 to be fully blown out from the air outlet 101a, resulting in a large air outlet range. Furthermore, if a first air guide component 104 is provided on the air outlet path, it will be beneficial to achieve adjustment and rectification of the air outlet angle in the left-right direction. Moreover, for this case where the air outlet 101a is large, if an air outlet grille 103 is provided in front of the first air guide component 104, it can provide a certain degree of protection while meeting the air outlet requirements.

[0095] The air outlet grille 103 includes multiple horizontal grille bars 1032 and multiple vertical grille bars 1031. The multiple horizontal grille bars 1032 are arranged at intervals along the vertical direction, and each horizontal grille bar 1032 extends laterally. The multiple vertical grille bars 1031 are arranged at intervals along the horizontal direction, and each vertical grille bar 1031 extends vertically. The lateral spacing Z1 between adjacent vertical grille bars 1031 is less than 1 / 3 of the vertical spacing Z2 between adjacent horizontal grille bars 1032. The vertical grille bars 1031 protrude from the front side of the horizontal grille bars 1031. Therefore, the vertical grilles 1031 are spaced closer together and are positioned to protrude from the front of the horizontal grilles 1032, making the horizontal grilles 1032 hidden behind the vertical grilles 1031. This makes it difficult for users to observe the horizontal grilles 1032, improving the visual effect and overall appearance. It also facilitates surface treatments on the front surface of the vertical grilles 1031, such as gold plating. In addition, the close spacing and density of the vertical grilles 1031 effectively prevent larger foreign objects from entering the air conditioner, providing protection and preventing damage to internal components such as the heat exchanger and fan, thus extending the service life of the air conditioner 200.

[0096] like Figure 4 As shown, the air conditioner 200 also includes a first air guide component 104, which includes a first air guide plate 1041. The first air guide plate 1041 is located in the second diffuser section 122 and can rotate around a vertical axis extending vertically. When combined with the rotatable first air guide plate 1041 and the multi-angle air outlet grille 103, it is beneficial to further achieve comprehensive airflow performance and improve comfort. With a single diffuser channel, increasing the airflow requires increasing the duct length, thus increasing the overall length. However, with a dual diffuser channel duct technology, this can be achieved without increasing the duct length.

[0097] In some embodiments, reference Figure 10 and Figure 11The air conditioner 200 also includes a second air guide plate component 105, which includes a second air guide plate 1051 at least mostly located in the first diffuser section 121. The second air guide plate 1051 is rotatable about a horizontal axis extending in the horizontal direction. That is, all or most of the second air guide plate 1051 is located within the first diffuser section 121. Since the second air guide plate 1051 is rotatable about a horizontal axis extending in the horizontal direction, it can achieve up-and-down swing airflow, adjust the up-and-down air supply angle, and help improve the air supply range of the whole unit in the vertical direction.

[0098] The configuration of the second air guide plate component 105 is not limited. For example, it may include a plurality of second air guide plates 1051 arranged at intervals in the vertical direction. The plurality of second air guide plates 1051 can be connected by a connecting rod 1052 extending vertically, so that the connecting rod 1052 can be pulled up and down by a drive motor, thereby driving the plurality of second air guide plates 1051 to rotate up and down synchronously.

[0099] In some embodiments, reference Figure 10 The air conditioner 100 also includes a protective net 106, which is located in the second diffuser section 122 and upstream of the first air guide plate 1041 and downstream of the second air guide plate 1051. This improves safety and meets safety regulations without affecting airflow.

[0100] For example, combined Figure 7 The air conditioner 200 may also include a display module 8, a rear housing 71, a top cover 72, and a base 73. The display module 8 is located on the rear side of the display panel 12, the panel component 1 is installed on the front side of the rear housing 71, the top cover 72 is located on the top of the rear housing 71, and both the panel component 1 and the rear housing 71 are located on the top of the base 73.

[0101] Other components and operations of the air conditioner according to the embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0102] Furthermore, it should be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this application will not describe the various possible combinations separately. In addition, various different embodiments of this application can also be arbitrarily combined, as long as they do not violate the spirit of this application, they should also be regarded as the content disclosed in this application.

[0103] In the description of this utility model, it should be understood that the terms "center," "lateral," "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0104] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0105] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0106] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An air duct structure characterized by, The air duct structure has an air duct, which includes an air inlet section and an air outlet section. The air inlet section is adapted to be equipped with a fan wheel. The air outlet section includes a first diffuser section and a second diffuser section. The first diffuser section connects the air inlet section and the second diffuser section. In a cross-section perpendicular to the axial direction of the air inlet section, the width of the air outlet section increases along the airflow direction. The two side walls of the first diffuser section in the width direction extend to the same side of the width of the air outlet section. The two side walls of the second diffuser section in the width direction extend away from each other in a direction away from the first diffuser section.

2. The air duct structure according to claim 1, wherein The first diffuser section has two side walls in the width direction, namely a first air duct wall and a second air duct wall. The second diffuser section has two side walls in the width direction, namely a third air duct wall and a fourth air duct wall. The third air duct wall is connected to the first air duct wall, and the fourth air duct wall is connected to the second air duct wall. The extension direction of the fourth air duct wall is different from the extension direction of the second air duct wall. In a cross-section perpendicular to the axial direction of the air inlet section, the line connecting the two ends in the extension direction of the first air duct wall is the first connecting line, the line connecting the two ends in the extension direction of the second air duct wall is the second connecting line, the line connecting the two ends in the extension direction of the third air duct wall is the third connecting line, and the line connecting the two ends in the extension direction of the fourth air duct wall is the fourth connecting line. The ratio of the length of the third connection to the length of the first connection is greater than or equal to 0.4 and less than or equal to 0.6; and / or, The ratio of the length of the fourth connection to the length of the second connection is greater than or equal to 0.4 and less than or equal to 0.

6.

3. The air duct structure according to claim 1, wherein The first diffuser section has two side walls in the width direction, namely the first air duct wall and the second air duct wall. In the cross section perpendicular to the axial direction of the air inlet section, the included angle between the first air duct wall and the second air duct wall is greater than or equal to 10° and less than or equal to 20°.

4. The air duct structure according to claim 1, wherein The ratio of the width of the outlet of the second diffuser section to the width of the inlet of the second diffuser section is greater than or equal to 1.1 and less than or equal to 1.

7.

5. The air duct structure according to claim 1, wherein The air duct is a cross-flow air duct, and the air duct structure has a volute tongue. The upstream end of the first diffuser section is located at the position of the volute tongue.

6. The air duct structure according to claim 1, wherein The second diffuser section has two side walls in the width direction, namely the third air duct wall and the fourth air duct wall. In a cross-section perpendicular to the axial direction of the air inlet section, the extension direction of the third air duct wall is consistent with the extension direction of the first diffuser section, and the third air duct wall includes a first convex section. The first convex section protrudes outward from the third connecting line and is directly connected to the first air duct wall of the first diffuser section. The third connecting line is the line connecting the two ends in the extension direction of the third air duct wall. The first convex section spans both sides of the midpoint of the third connecting line, and the maximum protrusion height of the first convex section is located on the side of the midpoint away from the first diffuser section.

7. The air duct structure according to claim 6, wherein The length of the projection of the first convex segment onto the third connecting line exceeds half the length of the third connecting line.

8. The air duct structure according to claim 6, wherein The maximum height of the first convex segment protruding beyond the third connecting line is greater than or equal to 25mm and less than or equal to 35mm.

9. The air duct structure according to claim 6, wherein The first diffuser section has two side walls in the width direction, namely the first air duct wall and the second air duct wall, and the third air duct wall corresponds to the first air duct wall. The first protruding section includes a first segment and a second segment. The first segment connects the first duct wall and the second segment. The maximum protrusion height of the first protruding section is located at the connection point between the first segment and the second segment. The angle between the first segment and the first air duct wall is an obtuse angle, the angle between the first segment and the second segment is an obtuse angle, and the angle between the second segment and the second air duct wall is smaller than the angle between the first air duct wall and the second air duct wall.

10. The air duct structure according to claim 6, wherein In a cross-section perpendicular to the axial direction of the air inlet section, the third air duct wall also includes a straight section extending in a straight line, the straight section being connected to the end of the first convex section away from the first diffuser section.

11. The air duct structure according to claim 10, wherein The straight section is tangentially connected to the first convex section.

12. The air duct structure according to claim 10, wherein The ratio of the length of the projection of the straight segment onto the third connecting line to the length of the projection of the first convex segment onto the third connecting line is greater than or equal to 0.1 and less than or equal to 0.

2.

13. The air duct structure according to claim 1, wherein The second diffuser section has two side walls in the width direction, namely the third air duct wall and the fourth air duct wall. In a cross-section perpendicular to the axial direction of the air inlet section, the extension direction of the fourth air duct wall is different from the extension direction of the first diffuser section. The fourth air duct wall includes a recessed section and a second convex section. The recessed section is connected between the second air duct wall of the first diffuser section and the second convex section. The recessed section is concave within the fourth connecting line, and the second convex section is convex outside the fourth connecting line. The fourth connecting line is the line connecting the two ends in the extension direction of the fourth air duct wall.

14. The air duct structure according to claim 13, wherein The two ends of the recessed section are smoothly connected to the second air duct wall and the second convex section, respectively.

15. The air duct structure according to claim 13, wherein The fourth air duct wall is configured to satisfy at least one of the following conditions: The ratio of the length of the projection of the concave segment onto the fourth connecting line to the length of the projection of the second convex segment onto the fourth connecting line is greater than or equal to 0.4 and less than or equal to 0.

5. The maximum depth of the recessed section concave within the fourth connecting line is greater than or equal to 2 mm and less than or equal to 6 mm. The second convex segment protrudes beyond the fourth connecting line at a maximum height greater than or equal to 2mm and less than or equal to 6mm.

16. The air duct structure according to any one of claims 1 to 15, characterized by, The first diffuser section has two side walls in the width direction, which are respectively a first air duct wall and a second air duct wall. The second diffuser section has two side walls in the width direction, which are respectively a third air duct wall and a fourth air duct wall. The air duct structure is configured to satisfy at least one of the following conditions: The third air duct wall is integrally connected to the first air duct wall; The fourth air duct wall is integrally connected to the second air duct wall; The third air duct wall is smoothly connected to the first air duct wall; The fourth air duct wall is smoothly connected to the second air duct wall.

17. An air conditioner characterized by comprising: include: A housing having an air outlet; The air duct structure is the air duct structure according to any one of claims 1-16, the air duct structure is disposed inside the housing, and the two side walls of the air outlet section extend to both sides of the width of the air outlet respectively. The wind turbine is disposed inside the housing and located in the air inlet section, the axial direction of the air inlet section being parallel to the axial direction of the wind turbine.

18. The air conditioner of claim 17, wherein The impeller is a cross-flow impeller. The two side walls of the first diffuser section in the width direction are the first air duct wall and the second air duct wall, respectively. In a cross-section perpendicular to the axial direction of the air inlet section, the line connecting the two ends of the first air duct wall in the extension direction is the first connecting line, and the line connecting the two ends of the second air duct wall in the extension direction is the second connecting line. The ratio of the length of the first connecting line to the diameter of the cross-flow wind turbine is greater than or equal to 1 and less than or equal to 1.

5. The ratio of the length of the second connecting line to the diameter of the cross-flow wind turbine is greater than or equal to 0.8 and less than or equal to 1.

2.

19. The air conditioner according to claim 17 or 18, characterized by The impeller is a cross-flow impeller, the air outlet is located on the front side of the casing, the axial direction of the impeller is vertical, the width direction of the air outlet section is horizontal, and the air conditioner also includes: An air outlet grille is provided at the air outlet. The width of the air outlet in the left-right direction is greater than or equal to 80% of the width of the air conditioner in the left-right direction. The air outlet grille includes multiple horizontal bars and multiple vertical bars. The multiple horizontal bars are arranged at intervals in the vertical direction and each horizontal bar extends in the horizontal direction. The multiple vertical bars are arranged at intervals in the horizontal direction and each vertical bar extends in the vertical direction. The horizontal spacing Z1 between adjacent vertical bars is less than 1 / 3 of the vertical spacing Z2 between adjacent horizontal bars. The vertical bars protrude from the front side of the horizontal bars. The first air guide component includes a first air guide plate, which is disposed in the second diffuser section and can rotate about a vertical axis extending vertically. The second air guide component includes at least a majority portion of a second air guide plate disposed in the first diffuser section, and the second air guide plate is rotatable about a transverse axis extending in the horizontal direction. A protective net is provided in the second diffuser section, and is located upstream of the first air guide plate and downstream of the second air guide plate.

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