Air return frame structure and air conditioning device

Abstract

The present disclosure relates to an air return frame structure and an air conditioning device. The air return frame structure comprises four mounting plates (1) connected to each other to form a frame structure having an air return vent (10); a first flange (2) is connected to the side of at least one mounting plate (1) located at the air return vent (10), the first flange (2) is bent towards the air return vent (10) relative to said mounting plate (1), a second flange (6) is connected to the end of the first flange (2) away from said mounting plate (1), the second flange (6) extends towards the interior of the frame structure, an opening (3) is formed in an area where the first flange (2) is connected to the second flange (6), and the opening (3) provides a channel for airflow to enter the frame structure.

Description

Return air frame structure and air conditioning equipment

[0001] Cross-references to related applications

[0002] This disclosure is based on and claims priority to a Chinese application with application number 202310907379.3 and filing date July 24, 2023. The disclosure content of the Chinese application is hereby introduced into this disclosure as a whole. Technical Field

[0003] The present disclosure relates to the technical field of air conditioning, and in particular to a return air frame structure and air conditioning equipment. Background Art

[0004] Duct air conditioner is the abbreviation of concealed air conditioner, and can also be called air conditioner duct air conditioner or duct air conditioner. Duct air conditioner is cheap, easy to maintain, and suitable for Chinese people's air conditioning usage habits, so it is widely used.

[0005] The return air frame is a crucial component of a ducted air conditioner. Its primary function is to ensure unimpeded flow between the centrifugal impellers and the external air duct, thereby ensuring optimal airflow and overall performance. Therefore, the quality of the return air frame structure significantly impacts the overall airflow and performance.

[0006] Summary of the Invention

[0007] The present disclosure provides a return air frame structure and an air conditioning device, which can increase the return air volume of the entire machine.

[0008] A first aspect of the present disclosure provides a return air frame structure, comprising: four mounting plates interconnected to form a frame structure having a return air outlet;

[0009] Among them, at least one mounting plate is connected to a first flange on one side of the return air outlet, the first flange is bent toward the return air outlet relative to the mounting plate, and the end of the first flange away from the mounting plate is connected to a second flange, the second flange extends toward the interior of the frame structure, and an opening is provided in the area where the first flange and the second flange are connected, and the opening forms a channel for air flow to enter the frame structure.

[0010] In some embodiments, the opening includes a first portion and a second portion, the first portion is located on the first flange, and the second portion is located on the second flange.

[0011] In some embodiments, the first portion has a first size along the width direction of the first flange, and the second portion has a second size along the width direction of the second flange, and the first size is smaller than the second size.

[0012] In some embodiments, a plurality of openings are spaced apart along the length direction of the first flange.

[0013] In some embodiments, each of the four mounting plates is provided with a first flange, and the opening is provided at least on the first flange extending along the length direction of the frame structure.

[0014] In some embodiments, a recessed portion is provided on the first flange, and the recessed portion is generally recessed toward the interior of the frame structure.

[0015] In some embodiments, the first flange is provided with a plurality of recessed portions spaced apart along its length.

[0016] In some embodiments, the recessed portion and the opening are correspondingly arranged in the length direction of the first flange.

[0017] In some embodiments, a guide portion is connected to an end of the second flange away from the first flange, and the guide portion is configured to guide the airflow entering from the opening to the interior of the frame structure.

[0018] In some embodiments, multiple openings are spaced apart along the length direction of the first flange, and multiple guide portions are spaced apart along the length direction of the second flange. The multiple guide portions are arranged in a one-to-one correspondence with the multiple openings, and the guide portions at least partially cover the area where the openings are set.

[0019] In some embodiments, the guide portion includes a first guide plate and a second guide plate, the first guide plate is connected to an end of the second flange away from the first flange and extends toward the mounting plate, and the second guide plate is connected to an end of the first guide plate away from the second flange and extends toward the direction away from the first flange.

[0020] In some embodiments, a third recessed portion is provided at an outer edge of the connection between the first flange and the mounting plate, and the third recessed portion is recessed toward the interior of the frame structure as a whole.

[0021] A second aspect of the present disclosure provides an air conditioning device, comprising: the return air frame structure of the above embodiment.

[0022] In some embodiments, the air conditioning device further includes a fan blade disposed in the frame structure and configured to draw external air into the frame structure through the return air inlet.

[0023] In some embodiments, the axial direction of the fan blade is consistent with the length direction of the frame structure, the opening is at least provided on the first flange extending along the length direction of the frame structure, and the opening is located outside the fan blade in the length direction of the frame structure.

[0024] In some embodiments, in the longitudinal direction of the frame structure, the length of the fan blade is L, the distance between the center position of the opening and the nearest end face of the fan blade is D, and the value range of D is [1 / 8L, 1 / 4L].

[0025] In some embodiments, two fan blades are spaced apart in the length direction within the frame structure, four openings are spaced apart on the same first flange, and one opening is provided on each side of each fan blade.

[0026] In some embodiments, the air conditioning equipment includes a ducted air conditioner.

[0027] The return air frame structure of the embodiment of the present invention takes into account that the provision of the first flange and the second flange will affect the wind resistance and reduce the return air volume. Therefore, an opening is provided in the area where the first flange and the second flange are connected. The external air flow can enter the interior of the frame structure from the return air port and the opening at the same time, which can reduce wind resistance, increase the return air volume, improve the air volume of the entire air-conditioning equipment, and optimize the air conditioning performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0029] FIG1 is a schematic structural diagram of some embodiments of the return air frame structure disclosed herein.

[0030] FIG2 is an exploded view of some embodiments of the return air frame structure of the present disclosure.

[0031] FIG3 is a schematic structural diagram of the mounting plate located at the return air outlet.

[0032] FIG4 is a schematic structural diagram of fan blades provided in the return air frame structure of the present disclosure.

[0033] FIG5 is an enlarged view of point A in FIG1 .

[0034] FIG6 is a schematic diagram of the inner structure of FIG5 .

[0035] Explanation of the accompanying drawings: 1. Mounting plate; 11. First plate; 12. Second plate; 13. Third plate; 14. Fourth plate; 2. First flange; 3. Opening; 31. First part; 32. Second part; 4. Recessed portion; 5. Guide portion; 51. First guide plate; 52. Second guide plate; 6. Second flange; 7. Reinforcement beam; 8. Third recessed portion; 9. Fan blade; 10. Return air outlet. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present disclosure and its application or use. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without carrying out creative work are within the scope of protection of the present disclosure.

[0037] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0038] In the description of the present disclosure, it should be understood that the terms "center", "lateral", "longitudinal", "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present disclosure.

[0039] In the description of the present disclosure, it should be understood that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of the present disclosure.

[0040] As shown in Figures 1 to 6, the present disclosure provides a return air frame structure, including: four mounting plates 1, which are interconnected to form a frame structure with a return air outlet 10; wherein, at least one mounting plate 1 is connected to a first flange 2 on a side located at the return air outlet 10, the first flange 2 is bent toward the return air outlet 10 relative to the mounting plate 1, and the end of the first flange 2 away from the mounting plate 1 is connected to a second flange 6, the second flange 6 extends toward the interior of the frame structure, and an opening 3 is provided in the area where the first flange 2 and the second flange 6 are connected, and the opening 3 forms a channel for air flow to enter the frame structure.

[0041] Specifically, the four mounting plates 1 include a first plate 11, a second plate 12, a third plate 13, and a fourth plate 14. The first plate 11 and the second plate 12 are disposed opposite each other, and the third plate 13 and the fourth plate 14 are disposed opposite each other. The third plate 13 is connected between the first ends of the first and second plates 11, 12, and the fourth plate 14 is connected between the second ends of the first and second plates 11, 12. The first plate 11 can serve as the top plate, the second plate 12 can serve as the bottom plate, the third plate 13 can serve as the left side plate, and the fourth plate 14 can serve as the right side plate. The fourth plate 14 can be combined with other components of the air conditioner to form an electrical box. The frame structure can be a rectangular frame, with one open end of the frame structure forming the return air vent 10.

[0042] To facilitate installation, at least one mounting plate 1 has a first flange 2 on one side of the return air outlet 10. The first flange 2 is bent relative to the mounting plate 1 toward the return air outlet 10, for example, at a 90° angle. As shown in Figure 1 , all four mounting plates 1 have a first flange 2 to facilitate grille installation.

[0043] For example, the second flange 6 can be arranged parallel to the mounting plate 1, and the first flange 2 can be perpendicular to the second flange 6. This structure connects the mounting plate 1 with the first flange 2 and the second flange 6 to form a C-shaped or U-shaped mounting edge structure. To increase the strength of the mounting edge of the mounting plate 1, a reinforcing beam 7 can be provided between the first flange 2 and the second flange 6. The provision of the second flange 6 increases the overall strength of the frame structure and the strength of the mounting edge of the mounting plate 1, making it less likely to deform when installing the grille at the return air outlet.

[0044] An opening 3 is provided in the area where the first flange 2 and the second flange 6 are connected. The opening 3 is continuous, connecting the inside of the return air frame structure with the outside, and allowing external airflow to enter the frame structure through the opening 3.

[0045] This embodiment takes into account that the provision of the first flange 2 and the second flange 6 will affect wind resistance and reduce the return air volume. Therefore, an opening 3 is provided in the area where the first flange 2 and the second flange 6 are connected. External airflow can enter the interior of the frame structure from the return air port 10 and the opening 3 at the same time, which can expand the air duct, reduce wind resistance, increase the return air volume, improve the air volume of the entire air-conditioning equipment, and optimize the air conditioning performance.

[0046] In some embodiments, as shown in FIG. 3 , the opening 3 includes a first portion 31 and a second portion 32 . The first portion 31 is located on the first flange 2 , and the second portion 32 is located on the second flange 6 . The first portion 31 is connected to the second portion 32 .

[0047] In this embodiment, the opening 3 is set on the first flange 2 and the second flange 6 at the same time. The air flow can enter from the wall of the first flange 2 through the first part 31, and can also enter from the wall of the second flange 6 through the second part 32. It can better increase the return air volume and minimize the impact of the setting of the first flange 2 and the second flange 6 on the return air volume.

[0048] For example, the opening 3 is provided in the connection area between the first flange 2 and the second flange 6 corresponding to the top mounting plate 1, and the air flow can enter the frame structure simultaneously from the front return air port 10, from the front through the first part 31, and from the bottom through the second part 32.

[0049] In some embodiments, the first portion 31 has a first size along the width direction of the first flange 2 , and the second portion 32 has a second size along the width direction of the second flange 6 , and the first size is smaller than the second size.

[0050] This embodiment takes into account that the first flange 2 needs to be installed with other structures through fasteners. The first part 31 is designed to be smaller in size along the width direction of the first flange 2, which can reduce the impact on the strength of the second flange 2. The second part 32 is designed to be larger in size along the width direction of the second flange 6, which can maximize the amount of air entering from the opening 3.

[0051] In some embodiments, as shown in FIG. 1 , a plurality of openings 3 are spaced apart along the length direction of the first flange 2 .

[0052] This embodiment provides a plurality of discontinuous openings 3, thereby increasing the return air volume while minimizing the impact on the structural strength of the return air frame.

[0053] Optionally, the opening 3 extends continuously along the length direction of the first flange 2 .

[0054] In some embodiments, as shown in FIG. 2 , each of the four mounting plates 1 is provided with a first flange 2 , and the opening 3 is provided at least on the first flange 2 extending along the length direction of the frame structure.

[0055] Since the mounting plate 1 extending along the length direction of the frame structure is longer, it has a greater impact on the overall strength of the frame structure, and the first flanges 2 set on these two mounting plates 1 have a relatively greater impact on the return air volume. By setting openings 3 on at least these two first flanges 2, it is possible to achieve a more significant effect in improving the overall strength of the frame structure and to minimize the impact of the first flanges 2 on wind resistance, thereby ensuring the return air volume.

[0056] In some embodiments, as shown in Figures 3 and 5 , the first flange 2 is provided with a recessed portion 4, which is generally recessed toward the interior of the frame structure. For example, the first flange 2 is a thin plate structure, and both the inner and outer surfaces of the recessed portion 4 are recessed toward the interior of the frame structure. The recessed portion 4 can be formed by stamping. For example, the shape of the recessed portion 4 can be an oblong, circular, or the like. This approach can achieve a better effect of increasing the strength of the frame structure while also reducing the difficulty of processing.

[0057] This embodiment provides a recessed portion 4 on the first flange 2, which can increase the overall strength of the frame structure through the profiled structure, enhance the vibration resistance and deformation resistance of the entire machine to a certain extent, and is also easy to process.

[0058] Furthermore, as shown in Figure 4 , because the recessed portion 4 protrudes relative to the rest of the inner wall of the first flange 2, it can guide the airflow entering from the opening 3, directing it in the direction of the arrows away from the first flange 2, thereby improving return air efficiency. To optimize the airflow guidance effect, the inner sidewall dimension of the recessed portion 4 along the width of the first flange 2 gradually decreases in the incoming air direction, i.e., the inner sidewall of the recessed portion 4 forms a slope. For example, in the cross-section of the first flange 2, the inner sidewall of the recessed portion 4 can be designed to be trapezoidal, arcuate, triangular, or the like.

[0059] In some embodiments, as shown in FIG2 , the first flange 2 is provided with a plurality of recessed portions 4 spaced apart along its length. This structure can not only effectively increase the strength of the frame structure but also reduce the difficulty of processing. Optionally, the recessed portions 4 extend continuously along the length of the first flange 2.

[0060] In some embodiments, the recessed portion 4 and the opening 3 are arranged in a corresponding manner along the length of the first flange 2. This arrangement can not only increase the strength of the frame structure, but also guide the airflow entering from the corresponding opening 3 through the recessed portion 4, thereby optimizing the airflow guidance effect. Optionally, the recessed portion 4 and the opening 3 can also be staggered along the length of the first flange 2.

[0061] In some embodiments, as shown in FIG3 , FIG5 and FIG6 , the end of the second flange 6 away from the first flange 2 is connected to a guide portion 5 , and the guide portion 5 is configured to guide the airflow entering from the opening 3 to the interior of the frame structure.

[0062] This embodiment provides the guide portion 5 on the second flange 6, thereby increasing the overall strength of the frame structure mounting edge and enhancing the vibration and deformation resistance of the entire machine to a certain extent. In addition, the guide portion 5 guides the airflow entering through the opening 3 into the interior of the frame structure.

[0063] In some embodiments, as shown in Figure 3, the guide portion 5 includes a first guide plate 51 and a second guide plate 52, the first guide plate 51 is connected to the end of the second flange 6 away from the first flange 2 and extends toward the direction close to the mounting plate 1, and the second guide plate 52 is connected to the end of the first guide plate 51 away from the second flange 6 and extends toward the direction away from the first flange 2.

[0064] The distance between the first guide plate 51 and the second guide plate 52 gradually increases from the second flange 6 to the second guide plate 52, forming a slope. This allows airflow entering through the opening 3 to flow toward the mounting plate 1 while also flowing toward the interior (rear) of the frame structure. The second guide plate 52 can extend parallel to the mounting plate 1. To optimize airflow guidance, a circular arc can be used as the transition between the second flange 6 and the first guide plate 51, and an airflow can be used as the transition between the first guide plate 51 and the second guide plate 52.

[0065] Moreover, as shown in Figure 3, since the guide portion 5 protrudes toward the interior of the frame structure relative to the inner wall of the second flange 6, it can guide the airflow entering from the opening 3, guiding the airflow to flow in the direction of the arrow away from the first flange 2, thereby improving the return air efficiency.

[0066] In some embodiments, multiple openings 3 are arranged at intervals along the length direction of the first flange 2, and multiple guide portions 5 are arranged at intervals along the length direction of the second flange 6. The multiple guide portions 5 are arranged one-to-one corresponding to the multiple openings 3, and the guide portions 5 at least partially cover the area where the openings 3 are set.

[0067] In this embodiment, the guide portions 5 are designed to be arranged at intervals, which can better guide the airflow entering from the opening 3 while reducing the weight of the return air frame structure.

[0068] In some embodiments, as shown in FIG1 , a third recessed portion 8 is provided at the outer edge of the connection between the first flange 2 and the mounting plate 1 , and the third recessed portion 8 is recessed toward the interior of the frame structure as a whole.

[0069] For example, the third recessed portion 8 may be a triangular rib-pressed portion, where the outer edge of the first flange 2 at the junction with the mounting plate 1 is pressed inward to form a triangular groove. A protrusion toward the interior of the frame structure forms a reinforcement at the junction of the first flange 2 and the mounting plate 1. For example, three third recessed portions 8 may be provided along the length of the third plate 13, with one third recessed portion 8 provided near the first plate 11 near the third plate 13. For example, the third recessed portion 8 may be formed by stamping.

[0070] This embodiment, by providing the third recessed portion 8, can significantly increase the component strength and deformation resistance of the mounting plate 1, thereby increasing the overall strength of the frame structure. Furthermore, the structure is simple, the overall processing difficulty is low, and the processing cost is low.

[0071] For example, the overall return air frame uses 0.6mm thick steel plate, which reduces the material volume by 25% and 37% respectively compared to the commonly used 0.8mm and 0.95mm. By using thinner materials, material costs can be greatly reduced. At the same time, thinner materials also have greater advantages in production links such as mold making. Without affecting the overall performance of the frame structure, it effectively reduces costs and processing difficulty, and improves production efficiency and finished product qualification rate.

[0072] The air return frame structure disclosed in the present invention not only enhances the overall strength of the frame and is easy to process, but also reduces wind resistance and increases air volume.

[0073] Secondly, the present disclosure also provides an air conditioning device including the return air frame structure of the above embodiment. Since the return air frame structure can reduce wind resistance and increase the return air volume, it can increase the air volume of the entire air conditioning device and optimize the air conditioning performance.

[0074] In some embodiments, as shown in FIG4 , the air conditioning device further includes blades 9 disposed within the frame structure and configured to draw external air into the frame structure through the return air vent. For example, at least two blades 9 are spaced apart along the length of the frame structure to increase the suction force.

[0075] For example, the fan blade 9 is a centrifugal fan blade. Due to the characteristic of the centrifugal fan blade that it absorbs air on both sides, the wind will gather on both sides of the fan blade along the axial direction, that is, the left and right directions in Figure 4. The air outlet direction is perpendicular to the air inlet direction and faces the interior of the frame structure. At this time, the air volume on both sides of the fan blade 9 is the majority of the air volume of the entire machine. At this time, the first flange 2 used for assembly needs will block part of the wind from entering, thereby reducing the air volume. By providing the opening 3, the recessed portion 4 and the guide portion 5, when the wind enters from the return air port and gathers on both sides of the fan blade along the axial direction, part of the wind enters from the first portion 31 of the opening 3, and the other part of the wind enters from the second portion 32 of the opening 3. Due to the guiding effect of the inner wall of the recessed portion 4, wind will also flow behind the first flange 2, thereby increasing the return air area of ​​the entire machine, and the air volume and heat exchange capacity of the entire machine are also improved. After the concave portion 4 completes its diversion function, the guide portion 5 also begins to play a diversion role, that is, guiding the wind to a deeper position behind the first flange 2, thereby further increasing the return air area to basically achieve the same air volume as when there is no first flange 2.

[0076] While increasing the air volume, the provision of the recessed portion 4 and the guide portion 5 can also enhance the strength of the frame structure, thereby enhancing the vibration resistance and deformation resistance of the entire machine to a certain extent. Moreover, the overall structure is relatively simple and easy to process.

[0077] In the embodiment shown in Figure 4, the opening 3 is provided on the first flange 2 above the fan blade 9, and four openings 3 are arranged on the first flange 2 at intervals along the length direction of the frame structure. From the perspective of ensuring the uniformity of the overall strength of the return air frame, the four openings 3 are evenly arranged, that is, the distance between two adjacent openings 3 is equal.

[0078] In other embodiments, the axial direction of the fan blade 9 is consistent with the length direction of the frame structure, and the opening 3 is at least arranged on the first flange 2 extending along the length direction of the frame structure, and the opening 3 is located on the outside of the fan blade 9 in the length direction of the frame structure.

[0079] Considering that when the blades 9 are in operation, wind will gather on both sides of the blades 9 along the axial direction. At this time, the air volume on both sides of the blades 9 constitutes the majority of the air volume of the entire machine. The first flange 2 provided for assembly purposes will block some of the wind from entering, thereby reducing the air volume. In this embodiment, the opening 3 is provided on the outside of the blades 9, allowing more wind from the sides of the blades 9 to enter the interior of the frame structure, which has a better effect on increasing the return air volume.

[0080] In some embodiments, as shown in FIG4 , in the longitudinal direction of the frame structure, the length of the fan blade 9 is L, the distance between the center position of the opening 3 and the nearest end face of the fan blade 9 is D, and the value range of D is [1 / 8L, 1 / 4L].

[0081] The length of the fan blade 9 is the distance between its two end faces along the axial direction.

[0082] In this embodiment, the openings 3 are arranged in the areas with larger air volume on both sides of the fan blades 9, and the specific positions of the openings 3 are arranged according to the positions of the fan blades 9. The openings 3 can be arranged at a position closer to the end faces of the fan blades 9. This area has a larger air volume, and a larger amount of air can be allowed to enter the interior of the frame structure from the openings 3, which has a better effect on increasing the return air volume.

[0083] In some embodiments, as shown in FIG4 , two fan blades 9 are spaced apart in the longitudinal direction within the frame structure, four openings 3 are spaced apart on the same first flange 2 , and one opening 3 is provided on each side of each fan blade 9 .

[0084] For example, four openings 3 are arranged at intervals on the first flange 2 above the fan blade 9, one opening 3 is arranged on both sides of one fan blade 9, and one opening 3 is arranged on both sides of the other fan blade 9. The distances between the center positions of all openings 3 and the nearest end face of the fan blade 9 can be the same, or they can be set according to actual test results to maximize the return air volume.

[0085] This embodiment is directed to a structure in which two fan blades 9 are arranged in a frame structure, and an opening 3 is provided in each area close to the end face of the fan blade 9. Auxiliary return air can be achieved through the opening 3 in the wind-rich area, thereby improving the return air effect.

[0086] In some embodiments, the air conditioning device includes a ducted air conditioner. Alternatively, the air conditioning device may also be other air conditioners having the return air frame structure of the above embodiment.

[0087] The return air frame structure is a crucial component of a ducted air conditioner. Its primary function is to ensure unobstructed airflow between the impellers 9 and the outside world, thereby guaranteeing the overall airflow and performance of the unit. Therefore, the return air frame structure significantly impacts the overall airflow and performance of a ducted air conditioner. Furthermore, as part of the unit's outer casing, its structural strength directly impacts the unit's vibration and deformation resistance. The return air frame structure disclosed herein offers high strength, low wind resistance, and low cost, effectively addressing these issues.

[0088] The above are merely exemplary embodiments of the present disclosure and are not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the scope of protection of the present disclosure.

Claims

1. A return air frame structure, comprising: Four mounting plates (1) are interconnected to form a frame structure having an air return port (10); Wherein, at least one of the mounting plates (1) is connected to a first flange (2) on one side of the return air outlet (10), the first flange (2) is bent relative to the mounting plate (1) toward the return air outlet (10), the first flange (2) is connected to a second flange (6) at one end away from the mounting plate (1), the second flange (6) extends toward the interior of the frame structure, and an opening (3) is provided in the area where the first flange (2) and the second flange (6) are connected, the opening (3) forming a channel for air flow to enter the frame structure.

2. The return air frame structure according to claim 1, wherein the opening (3) comprises a first part (31) and a second part (32), the first part (31) being located on the first flange (2), and the second part (32) being located on the second flange (6).

3. The return air frame structure according to claim 2, wherein the first portion (31) has a first size along the width direction of the first flange (2), and the second portion (32) has a second size along the width direction of the second flange (6), and the first size is smaller than the second size.

4. The air return frame structure according to any one of claims 1 to 3, wherein a plurality of the openings (3) are arranged at intervals along the length direction of the first flange (2).

5. The return air frame structure according to any one of claims 1 to 4, wherein the four mounting plates (1) are each provided with the first flange (2), and the opening (3) is at least provided on the first flange (2) extending along the length direction of the frame structure.

6. The return air frame structure according to any one of claims 1 to 5, wherein: The first flange (2) is provided with a recessed portion (4), and the recessed portion (4) is recessed toward the interior of the frame structure as a whole.

7. The return air frame structure according to claim 6, wherein the first flange (2) is provided with a plurality of recessed portions (4) at intervals along its length direction.

8. The air return frame structure according to claim 7, wherein the recessed portion (4) and the opening (3) are arranged correspondingly in the length direction of the first flange (2).

9. The return air frame structure according to any one of claims 1 to 5, wherein a guide portion (5) is connected to an end of the second flange (6) away from the first flange (2), and the guide portion (5) is configured to guide the airflow entering from the opening (3) to the interior of the frame structure.

10. The return air frame structure according to claim 9, wherein a plurality of the openings (3) are arranged at intervals along the length direction of the first flange (2), a plurality of the guide portions (5) are arranged at intervals along the length direction of the second flange (6), a plurality of the guide portions (5) are arranged in a one-to-one correspondence with a plurality of the openings (3), and the guide portions (5) at least partially cover the area where the openings (3) are arranged.

11. A return air frame structure according to claim 9 or 10, wherein the guide portion (5) comprises a first guide plate (51) and a second guide plate (52), the first guide plate (51) being connected to an end of the second flange (6) away from the first flange (2) and extending in a direction close to the mounting plate (1), and the second guide plate (52) being connected to an end of the first guide plate (51) away from the second flange (6) and extending in a direction away from the first flange (2).

12. The return air frame structure according to any one of claims 1 to 11, wherein a third recessed portion (8) is provided at the outer edge of the connection between the first flange (2) and the mounting plate (1), and the third recessed portion (8) is recessed toward the inside of the frame structure as a whole.

13. An air conditioning device, comprising the return air frame structure according to any one of claims 1 to 12.

14. The air conditioning device according to claim 13, further comprising a fan blade (9) disposed in the frame structure and configured to draw external air into the frame structure through the return air port (10).

15. The air conditioning equipment according to claim 14, wherein the axial direction of the fan blade (9) is consistent with the length direction of the frame structure, the opening (3) is at least arranged on the first flange (2) extending along the length direction of the frame structure, and the opening (3) is located on the outside of the fan blade (9) in the length direction of the frame structure.

16. The air-conditioning equipment according to claim 15, wherein in the length direction of the frame structure, the length of the fan blade (9) is L, the distance between the center position of the opening (3) and the nearest end face of the fan blade (9) is D, and the value range of D is [1 / 8L, 1 / 4L].

17. An air conditioning device according to claim 15 or 16, wherein two of the fan blades (9) are arranged at intervals along the length direction in the frame structure, four of the openings (3) are arranged at intervals on the same first flange (2), and one of the openings (3) is arranged on both sides of each of the fan blades (9).

18. The air conditioning device according to any one of claims 13 to 17, wherein the air conditioning device comprises a ducted air conditioner.

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