Cross-flow air duct structure and cabinet type air conditioner indoor unit

Abstract

The utility model discloses a cross-flow air duct structure and a cabinet type air conditioner indoor unit in the technical field of air conditioner products. The portions, where airflow passes through, of the two sides of the rear volute structure are segmentation flow guide structures, the front ends of the segmentation flow guide structures are fluctuant, the flow guide plates are arranged on the sides, away from the cross-flow fan, of the segmentation flow guide structures, and gaps exist between the front ends and the rear ends of the flow guide plates and the segmentation flow guide structures so that air can flow through the rear ends of the segmentation flow guide structures to move towards the front ends. The size of a gap between the front end of the flow guide plate and the dividing flow guide structure is larger than or equal to 1.5 mm, and the size of a gap between the rear end of the flow guide plate and the dividing flow guide structure is larger than or equal to the size of a gap between the front end of the flow guide plate and the dividing flow guide structure. The flow guide plate is additionally arranged, so that an air flow direction is added to the front end of the division flow guide structure, the air flow direction is forward along the division flow guide structure, the state of the air flow directly entering the cross-flow fan can be changed, the state energy of the air flow entering the cross-flow fan is dispersed, the impact on the cross-flow fan is reduced, and then the noise is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of air-conditioning products, and in particular to a cross-flow duct structure and a cabinet-type air-conditioning indoor unit. Background Art

[0002] In cabinet air conditioners, crossflow fans are generally multi-wing crossflow fans, which are composed of multiple impellers connected in sequence along the axis of rotation. The diameter of the crossflow fan is much smaller than the axial length. The air duct structure of a crossflow cabinet air conditioner is a crossflow air duct system, including a volute structure and a rear volute structure. The overall shape of the volute structure and the rear volute structure usually remains unchanged along the axis of the crossflow fan.

[0003] In actual work, when the crossflow fan speed is high, the indoor unit of the air conditioner often has abnormal noise in the middle and high frequencies, which is mostly related to the blade frequency noise. In order to solve this abnormal noise, the existing technical means mainly include changing the volute tongue structure to a sawtooth or wave type, connecting the multiple sub-impellers of the crossflow fan according to a certain regular distribution, and setting wave steps on the rear volute curved surface along the rotation axis direction, etc., by taking advantage of the fact that the length of the crossflow fan is much larger than the diameter. Utility Model Content

[0004] In order to overcome the technical problem that the existing cabinet-type air-conditioning indoor unit is prone to high-frequency noise, the utility model provides a cross-flow duct structure and a cabinet-type air-conditioning indoor unit.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A crossflow duct structure, a crossflow fan is arranged in the crossflow duct structure, the crossflow duct structure includes a volute tongue structure and a rear volute structure, the parts on both sides of the rear volute structure where air flows are divided and guided by a structure, the front end of the divided and guided structure is provided with an undulating shape, the extension direction of the undulating shape is consistent with the direction of the axis of the crossflow fan, and the structure also includes a guide plate, the guide plate is arranged on the side of the divided and guided structure away from the crossflow fan, the extension direction of the guide plate is consistent with the direction of the axis of the crossflow fan, on the section perpendicular to the axis of the crossflow fan, there are gaps between the front and rear ends of the guide plate and the divided and guided structure for air flow to move to the front end through the rear end of the divided and guided structure, the gap size between the front end of the guide plate and the divided and guided structure is greater than or equal to 1.5 mm, and the gap size between the rear end of the guide plate and the divided and guided structure is greater than or equal to the gap size between the front end of the guide plate and the divided and guided structure; the guide plate includes at least a first guide surface and a second guide surface, the first guide surface guides the incoming flow to the undulating trough or the side of the trough away from the crest, and the second guide surface guides the incoming flow to the rear end of the divided and guided structure.

[0007] In the present application, a guide plate is additionally provided, and the guide plate adds an airflow direction at the front end of the split guide structure. The airflow direction flows forward along the split guide structure, which can change the state of the airflow directly entering the inlet, disperse the energy of the airflow state entering the cross-flow fan, reduce the impact on the cross-flow fan, and thereby reduce noise.

[0008] In some embodiments, on a section perpendicular to the axis of the crossflow blower, a gap size between a front end of the guide plate and the divided guide structure is 2-3 mm.

[0009] In this embodiment, on the section perpendicular to the axis of the cross-flow blower, the gap size between the front end of the guide plate and the divided guide structure is preferably 2-3 mm to avoid a worse noise effect when the gap is too small; to avoid increased resistance and poor noise reduction effect when the gap is too large.

[0010] In some embodiments, the distance between the undulating wave crest and the wave trough is HD, and on a section perpendicular to the axis of the crossflow blower, the first guide surface guides the incoming flow to a position HD-1.2HD behind the wave crest.

[0011] In this embodiment, the distance is limited to limit the setting position of the first guide surface to limit the direction of the airflow caused by the additional guide plate, so that when the airflow is mixed with the airflow directly entering the inlet, the state of the airflow directly entering the inlet can be effectively changed.

[0012] In some embodiments, the guide plate is composed of a first guide plate and a second guide plate. The outer surface of the first guide plate is the first guide surface, and the outer surface of the second guide plate is the second guide surface. On the section perpendicular to the axis of the crossflow blower, the gap size between the second guide plate and the divided guide structure is 3mm-6mm.

[0013] In this embodiment, the guide plate includes two parts, which ensures the functionality while having a relatively simple structure.

[0014] In some embodiments, the guide plate is composed of a first guide plate, a second guide plate and a third guide plate. The third guide plate is connected to the side of the second guide plate away from the first guide plate. The outer surface of the first guide plate is the first guide surface, and the outer surface of the second guide plate is the second guide surface. On the section perpendicular to the axis of the cross-flow fan, the gap size between the third guide plate and the dividing guide structure is 3mm-6mm.

[0015] In this embodiment, a third guide plate is additionally provided to increase the area enclosed by the guide plate and the divided guide structure within a limited space.

[0016] In some embodiments, a plurality of first guide holes are provided on the first guide plate, and a plurality of second guide holes are provided on the second guide plate.

[0017] In this embodiment, by adding the first guide hole and the second guide hole, the inlet and outflow channels of the enclosed area between the guide plate and the divided guide structure are increased, so that multiple airflow mixing occurs at the air inlet, further destroying the airflow consistency of the incoming flow and reducing the noise caused by the impact of the incoming flow.

[0018] In some embodiments, a plurality of first guide holes are distributed on a first guide plate along the axis of the crossflow fan, a plurality of second guide holes are distributed on a second guide plate along the axis of the crossflow fan, and the positions of the first guide holes and the second guide holes are irregularly distributed; wherein the irregular distribution includes multiple implementation methods, for example, a plurality of guide holes of the same type have different shapes, and the positions of the same or two guide holes are irregular.

[0019] In this embodiment, the first guide hole and the second guide hole are distributed along the axis of the crossflow fan, which is convenient for processing the two, and convenient for the passing airflow to fully mix with the inlet airflow. Furthermore, the positions of the first guide hole and the second guide hole are irregularly distributed to further destroy the consistency of the airflow of the incoming flow, thereby reducing the noise caused by the impact of the incoming flow.

[0020] In some embodiments, the first guide hole is circular, the second guide hole is rectangular, the length direction of the rectangle is consistent with the axis direction of the crossflow fan, and rounded corners are set at the four corners of the rectangle.

[0021] In this embodiment, the first guide hole is preferably circular, and the second guide hole is rectangular, with four rounded corners. On the one hand, it is a conventional pattern, which is convenient for processing; on the other hand, the pattern avoids corners around it to avoid noise caused by airflow. The first guide hole is circular, and with the same width, a larger number can be set than the rectangular one, so that the number of airflows discharged from the first guide hole increases, so as to further destroy the consistency of the incoming airflow.

[0022] In some embodiments, the diameter of the crossflow fan is D, the distance between two adjacent undulating wave crests is less than or equal to 0.1D, and the distance from the wave crest to the wave trough is less than or equal to 0.08D.

[0023] In this embodiment, the undulating shape is set as above to enhance the noise reduction effect.

[0024] The utility model also provides a cabinet-type air-conditioning indoor unit, comprising the cross-flow air duct structure described in any one of the above embodiments.

[0025] The beneficial effects of the utility model are:

[0026] A guide plate mechanism is added to change the airflow direction at the entrance of the crossflow duct structure, reduce the angle of airflow turning, and thereby reduce the vortex state of the airflow on the side of the rear volute structure close to the crossflow fan, reduce the impact on the crossflow fan, and thereby reduce noise; the undulating shape set at the front end of the split guide structure further causes a mixed flow effect in the airflow at the entrance of the crossflow duct structure, and the airflow consistency entering the crossflow duct is poor, so that the energy distribution is not concentrated, thereby reducing noise; guide holes are added to the guide plate, and the inflow and outflow channels of the enclosed area between the guide plate and the split guide structure are increased, so that multiple airflow mixing occurs at the air inlet, further destroying the airflow consistency of the incoming flow and reducing the noise caused by the impact of the incoming flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of the internal structure of a cabinet-type air-conditioning indoor unit according to a first embodiment of the present invention;

[0028] Figure 2 for Figure 1 Three-dimensional schematic diagram of the mid-rear volute structure;

[0029] Figure 3 for Figure 1 A cross-sectional schematic diagram of a central cabinet air conditioner indoor unit;

[0030] Figure 4 for Figure 3 A magnified view of middle;

[0031] Figure 5 This is a schematic structural diagram of another implementation of the guide plate in Example 1;

[0032] Figure 6 It is a three-dimensional schematic diagram of the rear volute structure in the second embodiment;

[0033] Figure 7 is an enlarged view of the guide plate in Example 2;

[0034] Figure 8 This is a schematic structural diagram of another implementation of the guide plate in Example 2;

[0035] Fig. 9 Schematic diagram of hole distribution on the guide plate in Example 2 Figure 1 ;

[0036] Fig.10 Schematic diagram of hole distribution on the guide plate in Example 2 Figure 2 ;

[0037] Fig.11 It is a schematic diagram of the undulating shape of the segmented guide structure in the utility model.

[0038] Marked in the figure are the air conditioner indoor unit casing 1, the indoor unit air outlet 1-1, the indoor unit air inlet 1-2, the heat exchanger 2, the cross-flow fan 3, the volute tongue structure 4, the rear volute structure 5, the split guide structure 5-1, the inner guide flow channel surface 5-2, the outer guide flow channel surface 5-3, the front end frame 5-1-1, the guide plate 6, the first guide plate 6-1, the first guide hole 6-1-1, the second guide plate 6-2, the second guide hole 6-2-2, the third guide plate 6-3, the first gap 11, and the second gap 12. DETAILED DESCRIPTION

[0039] The utility model is further described below in conjunction with the accompanying drawings.

[0040] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0041] Embodiment 1

[0042] like Figure 1-Figure 5 As shown, the utility model provides a cabinet type air conditioner indoor unit.

[0043] The cabinet air conditioner indoor unit of the utility model comprises: a crossflow duct structure, an air conditioner indoor unit casing 1 and a heat exchanger 2, the heat exchanger 2 is arranged in the crossflow duct structure, the crossflow duct structure comprises a volute tongue structure 4 and a rear volute structure 5, and a crossflow fan 3 is arranged in the crossflow duct structure, the diameter of the crossflow fan 3 is D, and the length of the crossflow fan 3 along the axial direction is L.

[0044] A relatively sealed internal space is formed between the crossflow duct structure and the heat exchanger 2, the air conditioner indoor unit housing 1 and the heat exchanger 2, so as to ensure that the airflow enters the heat exchanger 2 from the indoor unit air inlet 1-1, then enters the crossflow duct inlet, and is discharged to the outside along the crossflow duct outlet and the indoor unit air outlet 1-1 under the action of the crossflow fan 3.

[0045] The aforementioned cross-flow air duct inlet, namely the volute tongue structure 4 and the rear volute structure 5, are close to the edge of the heat exchanger 2; the aforementioned cross-flow air duct outlet, namely the volute tongue structure 4 and the rear volute structure 5, are close to the edge of the indoor unit air outlet 1-1.

[0046] The internal area between the heat exchanger 2 and the crossflow duct inlet is assembled by the heat exchanger 2, the volute structure 4 and the rear volute structure 5 to form a sealing area to ensure that the airflow enters the crossflow duct inlet from the heat exchanger 2.

[0047] Among them, the parts on both sides of the wall of the rear volute structure 5 through which air flows are called the divided guide structure 5-1 of the rear volute structure 5; the side of the divided guide structure 5-1 close to the crossflow fan 3 is the inner guide flow path surface 5-2; the side of the divided guide structure 5-1 away from the crossflow fan 3 is the outer guide flow path surface 5-3; the front end frame 5-1-1 of the divided guide structure 5-1, that is, the intersection of the outer guide flow path surface 5-3 and the inner guide flow path surface 5-2.

[0048] The front end frame 5 - 1 - 1 of the dividing guide structure 5 - 1 is arranged in an undulating shape, and the undulating shape is generally wave undulation or sawtooth undulation. The extending direction of the undulating shape is consistent with the axial direction of the crossflow fan 3 .

[0049] Conventional fluctuations such as Fig.11 As shown, it is obvious that the location of the crest or trough can be a point or a line segment; the crest or trough can be irregularly distributed to provide more airflow entry forms. In this embodiment, the preferred minimum distance between two adjacent crests and troughs is less than 0.1D; the distance between the crest line and the trough line is less than 0.08D.

[0050] From the perspective of the normal direction of the outer guide channel surface 5-3 close to the front end frame 5-1-1, the highest point and the lowest point of the undulation correspond to the crest and trough of the undulation.

[0051] In the present application, a guide plate 6 is additionally provided, and the guide plate 6 is arranged on the side of the dividing guide structure 5-1 away from the crossflow fan 3. The extension direction of the guide plate 6 is consistent with the axial direction of the crossflow fan 3. The cross-section of the guide plate 6 remains unchanged along the axial direction of the crossflow fan 3. On the section perpendicular to the axis of the crossflow fan 3, there is a gap between the front and rear ends of the guide plate 6 and the dividing guide structure 5-1 to allow the air flow to move to the front end through the rear end of the dividing guide structure 5-1. The gap size between the front end of the guide plate 6 and the dividing guide structure 5-1 is greater than or equal to 1.5 mm, and the gap size between the rear end of the guide plate 6 and the dividing guide structure 5-1 is greater than or equal to the gap size between the front end of the guide plate 6 and the dividing guide structure 5-1; the guide plate 6 includes at least a first guide surface and a second guide surface, the first guide surface guides the incoming flow to the undulating trough or the side of the trough away from the crest, and the second guide surface guides the incoming flow to the rear end of the dividing guide structure 5-1.

[0052] In the present application, a guide plate 6 is additionally provided, and the guide plate 6 adds an airflow direction at the front end of the segmented guide structure 5-1. The airflow direction flows forward along the segmented guide structure 5-1, which can change the state of the airflow directly entering the inlet of the cross-flow duct structure, so that the energy of the airflow state entering the cross-flow duct structure is dispersed, and the impact on the cross-flow fan 3 is reduced, thereby reducing the noise.

[0053] The guide plate 6 is relatively fixed to the segmented guide structure 5 - 1 by means of screws or buckles.

[0054] In this embodiment, on a section perpendicular to the axis of the crossflow fan, the preferred gap size between the front end of the guide plate 6 and the dividing guide structure 5-1, that is, the size of the first gap 11 is 2-3 mm, so as to avoid a worse noise effect when the gap is too small, and to avoid increased resistance and poor noise reduction effect when the gap is too large.

[0055] In this embodiment, the distance between the undulating crest and the trough is HD, and on the section perpendicular to the axis of the crossflow fan, the first guide surface guides the incoming flow to the position HD-1.2HD behind the crest. By limiting the aforementioned distance, the first guide surface is set to limit the direction of the airflow brought by the additional guide plate 6, so that when the airflow is mixed with the airflow directly entering the inlet, the state of the airflow directly entering the inlet can be effectively changed.

[0056] like Figure 4 As shown, in the present embodiment, the guide plate 6 is composed of a first guide plate 6-1, a second guide plate 6-2 and a third guide plate 6-3. The outer surface of the first guide plate 6-1 is the aforementioned first guide surface, the outer surface of the second guide plate 6-2 is the aforementioned second guide surface, and the outer surface of the third guide plate 6-3 is the third guide surface. The third guide surface is arranged along the extension direction of the second guide surface to obliquely divide the guide structure 5-1, and the whole is roughly U-shaped. The third guide plate 6-3 is connected to the side of the second guide plate 6-2 away from the first guide plate 6-1. The gap size between the third guide plate 6-3 and the dividing guide structure 5-1, that is, the size of the second gap 12 is preferably 3mm-6mm.

[0057] like Figure 5 As shown, another embodiment of the guide plate 6 in the present application is disclosed. Specifically, the guide plate 6 is composed of a first guide plate 6-1 and a second guide plate 6-3. The outer surface of the first guide plate 6-1 is the aforementioned first guide surface, and the outer surface of the second guide plate 6-2 is the aforementioned second guide surface. The whole is roughly V-shaped, and the gap size between the second guide plate 6-3 and the dividing guide structure 5-1, that is, the size of the second gap 12 is preferably 3mm-6mm.

[0058] exist Figure 4 and Figure 5 In the structure of the guide plate 6 shown, the various parts of the guide plate 6 are preferably connected by rounded transitions to avoid noise caused by airflow passing through the edges and corners. In conjunction with the outer surface of the first guide plate 6-1, that is, the first guide surface, the first guide surface extends to the position where the incoming flow is directed, that is, the outer surface of the first guide plate 6-1 extends to the intersection with the segmented guide structure 5-1, that is, on the section perpendicular to the axis of the crossflow fan 3, the intersection of the extension line of the first guide plate 6-1 and the segmented guide structure 5-1.

[0059] Based on the above two implementation methods of the guide plate 6, the number of the guide plates 6 in the present application is not limited to this, but at least the first guide plate 6-1 and the second guide plate 6-2 should be included to achieve the effect of guiding the front and rear ends of the guide segmentation structure 5-1. Based on the perspective of simplifying the structure and facilitating manufacturing and implementation, the number of guide plates in the present application should be small. From the perspective of simplifying the structure and the number of guide plates, the structure of the guide plate 6 in the present application is preferably as follows: Figure 5 However, considering the size limitation of the rear volute structure 5 and the surrounding area, the preferred embodiment is as follows Figure 4 The guide plate 6 structure shown is used to increase the area enclosed by the guide plate 6 and the dividing guide structure 5-1 within a limited space; and the third guide surface is arranged obliquely toward the dividing guide structure 5-1 along the extension direction of the second guide surface, so as to facilitate the airflow at the rear end of the dividing guide structure 5-1 to enter the enclosed area between the guide plate 6 and the dividing guide structure 5-1.

[0060] Embodiment 2

[0061] like Figure 6-Figure 10 As shown, the structure of the guide plate 6 disclosed in this embodiment is different from that in the first embodiment. The main difference is that the guide plate 6 in this embodiment is provided with guide holes. Specifically, a plurality of first guide holes 6-1-1 are provided on the first guide plate 6-1, and a plurality of second guide holes 6-2-2 are provided on the second guide plate 6-2. This increases the inflow and outflow channels of the enclosed area between the guide plate 6 and the split guide structure 5-1, so that multiple airflows are mixed at the air inlet, further destroying the consistency of the incoming airflow and reducing the noise caused by the incoming air impact.

[0062] like Figure 7 and Figure 8 As shown, the incoming flow can flow into the enclosed area between the guide plate 6 and the divided guide structure 5-1 through the second guide hole 6-2-2; the airflow between the enclosed area between the guide plate 6 and the divided guide structure 5-1 can flow out through the first guide hole 6-1-1.

[0063] comprehensive Fig. 9 and Fig.10 As shown, in some embodiments, a plurality of first guide holes 6-1-1 are distributed on the first guide plate 6-1 along the axis direction of the crossflow fan 3, and a plurality of second guide holes 6-2-2 are distributed on the second guide plate 6-2 along the axis direction of the crossflow fan 3. On the one hand, it is convenient for both to be processed; on the other hand, it is convenient for the passing airflow to be fully mixed with the inlet airflow.

[0064] The positions of the first guide hole 6-1-1 and the second guide hole 6-2-2 are irregularly distributed to further disrupt the consistency of the incoming flow, thereby reducing the noise caused by the impact of the incoming flow. The irregular distribution includes multiple implementation methods, such as different shapes of multiple guide holes of the same type, and irregular positions of the same or two guide holes.

[0065] In this embodiment, the first guide hole 6-1-1 is circular, and the second guide hole 6-2-2 is rectangular. The length direction of the rectangle is consistent with the axis direction of the crossflow fan 3, and the four corners of the rectangle are set with rounded transitions. On the one hand, both are conventional graphics, which is convenient for processing; on the other hand, the edges and corners are avoided around the graphics to avoid noise caused by airflow. The first guide hole 6-1-1 is circular. Under the same width, more can be set than the rectangle, so that the number of airflows discharged from the first guide hole 6-1-1 increases, so as to further destroy the consistency of the incoming airflow.

[0066] In this embodiment, the size of the first guide hole 6-1-1 is smaller than the size of the second guide hole 6-2-2, and the number of the first guide holes 6-1-1 is greater than the number of the second guide holes 6-2-2, and is recommended to be 3-5 times. Taking the diameter D of the crossflow fan 3 as a reference value, the preferred length of the second guide hole 6-2-2 is 0.12D-0.2D, and the width of the second guide hole 6-2-2 is 0.2-0.4 times the length. The area of ​​the first guide hole 6-1-1 is 1 / 12-1 / 8 of the area of ​​the second guide hole 6-2-2.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A crossflow air duct structure, wherein the crossflow fan (3) is arranged in the crossflow air duct structure, the crossflow air duct structure comprises a volute tongue structure (4) and a rear volute structure (5), the parts on both sides of the rear volute structure (5) through which air flows are divided into flow guide structures (5-1), the side close to the crossflow air duct inlet is the front, and the side away from the crossflow air duct inlet is the rear, the front end of the divided flow guide structure (5-1) is arranged in an undulating shape, and the extending direction of the undulating shape is consistent with the axial direction of the crossflow fan (3), Its characteristics are: It also comprises a guide plate (6), the guide plate (6) being arranged on a side of the split guide structure (5-1) away from the crossflow fan (3), the extension direction of the guide plate (6) being consistent with the axial direction of the crossflow fan (3), and on a section perpendicular to the axial direction of the crossflow fan (3), there are gaps between the front and rear ends of the guide plate (6) and the split guide structure (5-1) to allow airflow to move from the rear end of the split guide structure (5-1) to the front end, the gap size between the front end of the guide plate (6) and the split guide structure (5-1) being greater than or equal to 1.5 mm, and the gap size between the rear end of the guide plate (6) and the split guide structure (5-1) being greater than or equal to the gap size between the front end of the guide plate (6) and the split guide structure (5-1); The guide plate (6) comprises at least a first guide surface and a second guide surface, wherein the first guide surface guides the incoming flow to the undulating trough or the side of the trough away from the wave crest, and the second guide surface guides the incoming flow to the rear end of the split guide structure (5-1).

2. The crossflow air duct structure according to claim 1, Its characteristic is that On a section perpendicular to the axis of the cross-flow fan (3), the gap size between the front end of the guide plate (6) and the dividing guide structure (5-1) is 2 mm to 3 mm.

3. The crossflow duct structure according to claim 1, Its characteristics are: The distance between the undulating wave crest and the wave trough is HD. On a section perpendicular to the axis of the cross-flow fan (3), the first guide surface guides the incoming flow to a position HD-1.2HD behind the wave crest.

4. The cross-flow air duct structure according to claim 1, Its characteristics are: The guide plate (6) is composed of a first guide plate (6-1) and a second guide plate (6-2). The outer surface of the first guide plate (6-1) is a first guide surface, and the outer surface of the second guide plate (6-2) is a second guide surface. On a section perpendicular to the axis of the crossflow fan (3), the gap size between the second guide plate (6-2) and the split guide structure (5-1) is 3 mm to 6 mm.

5. The cross-flow air duct structure according to claim 1, Its characteristics are: The guide plate (6) is composed of a first guide plate (6-1), a second guide plate (6-2) and a third guide plate (6-3); the third guide plate (6-3) is connected to the side of the second guide plate (6-2) away from the first guide plate (6-1); the outer surface of the first guide plate (6-1) is the first guide surface; the outer surface of the second guide plate (6-2) is the second guide surface; on a section perpendicular to the axis of the cross-flow fan (3), the gap size between the third guide plate (6-3) and the split guide structure (5-1) is 3 mm to 6 mm.

6. The cross-flow air duct structure according to claim 4 or 5, Its characteristic is that A plurality of first flow guide holes (6-1-1) are provided on the first flow guide plate (6-1), and a plurality of second flow guide holes (6-2-2) are provided on the second flow guide plate (6-2).

7. The cross-flow air duct structure according to claim 6, Its characteristics are: A plurality of first guide holes (6-1-1) are distributed on the first guide plate (6-1) along the axial direction of the crossflow fan (3), and a plurality of second guide holes (6-2-2) are distributed on the second guide plate (6-2) along the axial direction of the crossflow fan (3), and the positions of the first guide holes (6-1-1) and the second guide holes (6-2-2) are irregularly distributed.

8. The cross-flow air duct structure according to claim 7, Its characteristics are: The first flow guide hole (6-1-1) is circular, and the second flow guide hole (6-2-2) is rectangular. The length direction of the rectangle is consistent with the axis direction of the cross-flow fan (3), and rounded corners are provided at the four corners of the rectangle.

9. The cross-flow air duct structure according to claim 1, Its characteristics are: The cross-flow fan (3) has a diameter of D, a distance between two adjacent undulating wave crests of less than or equal to 0.1D, and a distance from a wave crest to a wave trough of less than or equal to 0.08D.

10. Cabinet air conditioner indoor unit, Its characteristics are: It comprises the cross-flow air duct structure as described in any one of claims 1 to 9.

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