CN220287592U - Return air frame structure and air conditioning equipment - Google Patents

Abstract

The present disclosure relates to a return air frame structure and air conditioning equipment, wherein the return air frame structure includes: the four mounting plates (1) are connected with each other to form a frame structure with an air return opening (10); wherein, at least one mounting panel (1) is being located one side of return air inlet (10) is connected with first turn-ups (2), first turn-ups (2) for mounting panel (1) orientation return air inlet (10) are buckled, first turn-ups (2) are kept away from one end of mounting panel (1) is connected with second turn-ups (6), second turn-ups (6) orientation frame structure's inside extends, first turn-ups (2) with the region that second turn-ups (6) are connected is equipped with opening (3), opening (3) form the air feed stream and get into frame structure's passageway.

Description

Return air frame structure and air conditioning equipment

Technical Field

The disclosure relates to the field of air conditioning technologies, and in particular relates to a return air frame structure and air conditioning equipment.

Background

The air duct machine is a short name of a hidden air conditioner and can also be called an air conditioner air duct machine or an air duct machine air conditioner. The air conditioner of the air pipe machine has low cost, convenient maintenance, suitability for the use habit of the air conditioner of the national people and wide application.

The return air frame is an important component in the air duct machine. The main function of the centrifugal fan blade is to ensure the smoothness of the centrifugal fan blade in the middle of the whole machine and an external air duct, thereby ensuring the air quantity and the performance of the whole machine. Therefore, the good or bad of the return air frame structure is an important ring for influencing the air quantity and the performance of the whole machine.

Disclosure of Invention

The utility model provides a return air frame structure and air conditioning equipment can improve the return air amount of wind of complete machine.

The first aspect of the present disclosure provides a return air frame structure, comprising: the four mounting plates are connected with each other to form a frame structure with an air return opening;

wherein, at least one mounting panel is connected with first turn-ups in one side of return air inlet, and first turn-ups are buckled towards the return air inlet for the mounting panel, and the one end that the mounting panel was kept away from to first turn-ups is connected with the second turn-ups, and the second turn-ups extends towards frame construction's inside, and the region that first turn-ups and second turn-ups are connected is equipped with the opening, and the opening forms the passageway that the air feed stream got into frame construction.

In some embodiments, the opening includes a first portion and a second portion, the first portion being located on the first turn and the second portion being located on the second turn.

In some embodiments, the first portion has a first dimension along a width of the first cuff and the second portion has a second dimension along a width of the second cuff, the first dimension being smaller than the second dimension.

In some embodiments, the plurality of openings are spaced apart along the length of the first flange.

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

In some embodiments, the first flange is provided with a recess, and the recess is entirely recessed toward the interior of the frame structure.

In some embodiments, the first turn-over is provided with a plurality of concave portions at intervals along its length direction.

In some embodiments, the recess and the opening are disposed in correspondence with each other in a length direction of the first flange.

In some embodiments, a guide portion is connected to an end of the second flange remote from the first flange, the guide portion being configured to guide the air flow entering from the opening into the interior of the frame structure.

In some embodiments, the openings are disposed at intervals along the length direction of the first flange, the guide portions are disposed at intervals along the length direction of the second flange, the plurality of guide portions are disposed in one-to-one correspondence with the plurality of openings, and the guide portions at least partially cover the area where the openings are disposed.

In some embodiments, the guide portion includes a first guide plate and a second guide plate, the first guide plate is connected to the second flange to be away from the one end of the first flange and extend toward a direction near the mounting plate, and the second guide plate is connected to the first guide plate to be away from the one end of the second flange and extend toward a direction away from the first flange.

In some embodiments, a third concave portion is arranged at the outer edge of the connection part of the first flanging and the mounting plate, and the third concave portion is wholly concave towards the inside of the frame structure.

A second aspect of the present disclosure provides an air conditioning apparatus, comprising: the return air frame structure of the embodiment.

In some embodiments, the air conditioning apparatus further comprises a fan blade disposed within the frame structure and configured to draw outside air into the frame structure through the return air inlet.

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 arranged on a first turnup extending along the length direction of the frame structure, and the opening is positioned outside the fan blade in the length direction of the frame structure.

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

In some embodiments, two fan blades are arranged in the frame structure at intervals along the length direction, four openings are arranged on the same first flanging at intervals, and two sides of each fan blade are respectively provided with one opening.

In some embodiments, the air conditioning apparatus comprises an air duct machine.

According to the return air frame structure, the wind resistance can be influenced by the arrangement of the first flanging and the second flanging, the return air quantity is reduced, the opening is arranged in the area where the first flanging is connected with the second flanging, the outside air flow can enter the frame structure from the return air inlet and the opening at the same time, the wind resistance can be reduced, the return air quantity is increased, the air quantity of the whole air conditioning equipment is improved, and the air conditioning performance is optimized.

Drawings

In order to more clearly illustrate the embodiments of the present disclosure or the solutions in the prior art, the drawings that are required for the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present disclosure, and that other drawings may be obtained according to these drawings without inventive faculty for a person skilled in the art.

Fig. 1 is a schematic diagram of some embodiments of a return air frame structure of the present disclosure.

Fig. 2 is an exploded view of some embodiments of the return air frame structure of the present disclosure.

Fig. 3 is a schematic structural view of the mounting plate at the air return opening.

Fig. 4 is a schematic view of a structure in which fan blades are disposed in a return air frame structure of the present disclosure.

Fig. 5 is an enlarged view at a in fig. 1.

Fig. 6 is a schematic view of the inner structure of fig. 5.

Description of the reference numerals

1. A mounting plate; 11. a first plate; 12. a second plate; 13. a third plate; 14. a fourth plate; 2. a first flanging; 3. an opening; 31. a first portion; 32. a second portion; 4. a concave portion; 5. a guide section; 51. a first guide plate; 52. a second guide plate; 6. a second flanging; 7. a stiffening beam; 8. a third concave portion; 9. a fan blade; 10. and (5) an air return port.

Detailed Description

The following description of the technical solutions in the embodiments of the present disclosure will be made clearly and completely with reference to the accompanying drawings in the embodiments of the present disclosure, and it is apparent that the described embodiments are only some embodiments of the present disclosure, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses. Based on the embodiments in this disclosure, all other embodiments that a person of ordinary skill in the art would obtain without carrying out the inventive task are within the scope of protection of this disclosure.

Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods, and apparatus should be considered part of the specification.

In the description of the present disclosure, it should be understood that the terms "center," "lateral," "longitudinal," "front," "rear," "left," "right," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present disclosure and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the scope of the present disclosure.

In the description of the present disclosure, it should be understood that the use of terms such as "first," "second," etc. for defining components is merely for convenience in distinguishing corresponding components, and the terms are not meant to be construed as limiting the scope of the present disclosure unless otherwise indicated.

As shown in fig. 1 to 6, the present disclosure provides a return air frame structure, including: the four mounting plates 1 are connected with each other to form a frame structure with an air return opening 10; wherein, at least one mounting panel 1 is connected with first turn-ups 2 in the one side that is located return air inlet 10, and first turn-ups 2 are buckled towards return air inlet 10 for mounting panel 1, and the one end that mounting panel 1 was kept away from to first turn-ups 2 is connected with second turn-ups 6, and second turn-ups 6 extend towards frame structure's inside, and the region that first turn-ups 2 and second turn-ups 6 are connected is equipped with opening 3, and opening 3 forms the passageway that supplies the air current to get into frame structure.

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 to each other, the third plate 13 and the fourth plate 14 are disposed opposite to each other, the third plate 13 is connected between respective first ends of the first plate 11 and the second plate 12, and the fourth plate 14 is connected between respective second ends of the first plate 11 and the second plate 12. The first plate 11 can be used as a top plate, the second plate 12 can be used as a bottom plate, the third plate 13 can be used as a left side plate, the fourth plate 14 can be used as a right side plate, and the fourth plate can be enclosed with other components in the air conditioning component to form an electric box. The frame structure may be a rectangular frame, and one open end of the frame structure forms the return air opening 10.

For ease of installation, at least one mounting plate 1 is provided with a first flange 2 on the side of the return air opening 10, the first flange 2 being bent relative to the mounting plate 1 towards the return air opening 10, for example, at an angle of 90 °. As shown in fig. 1, four mounting plates 1 are each provided with a first flange 2 for mounting the grille.

For example, the second flange 6 may be disposed parallel to the mounting plate 1, the first flange 2 may be perpendicular to the second flange 6, and 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, and in order to increase the strength of the mounting edge of the mounting plate 1, a reinforcing beam 7 may be disposed between the first flange 2 and the second flange 6. Through setting up second turn-ups 6, can increase frame construction's bulk strength to increase the intensity of mounting panel 1's installation limit, be difficult to take place to warp when installing return air inlet department installation grid.

The area that first turn-ups 2 and second turn-ups 6 are connected is equipped with opening 3, and opening 3 link up, communicates the inside and outside of return air frame structure, allows outside air current to get into the frame structure inside through opening 3.

In this embodiment, the wind resistance is affected by the arrangement of the first flange 2 and the second flange 6, and the air return quantity is reduced, so that the opening 3 is arranged in the area where the first flange 2 is connected with the second flange 6, and the external air flow can enter the frame structure from the air return opening 10 and the opening 3 at the same time, so that the air duct can be enlarged, the wind resistance is reduced, the air return quantity is increased, the air quantity of the whole air conditioning equipment is improved, and the air conditioning performance is optimized.

In some embodiments, as shown in fig. 3, the opening 3 comprises a first portion 31 and a second portion 32, the first portion 31 being located on the first flange 2 and the second portion 32 being located on the second flange 6, the first portion 31 being in communication with the second portion 32.

In this embodiment, the openings 3 are simultaneously arranged on the first flange 2 and the second flange 6, and the air flow can enter the air from the wall surface of the first flange 2 through the first part 31 and enter the air from the wall surface of the second flange 6 through the second part 32, so that the air return quantity can be improved better, and the influence of the arrangement of the first flange 2 and the second flange 6 on the air return quantity is reduced as much as possible.

For example, the openings 3 are provided in the connection area of the corresponding first flange 2 and second flange 6 of the top mounting plate 1, and the air flow can enter the frame structure from the air return opening 10 in front, from the front through the first portion 31, and from the bottom through the second portion 32.

In some embodiments, the first portion 31 has a first dimension in the width direction of the first turn-up edge 2 and the second portion 32 has a second dimension in the width direction of the second turn-up edge 6, the first dimension being smaller than the second dimension.

This embodiment allows for the first flange 2 to be mounted with other structures by fasteners, the first portion 31 being designed to be smaller in the width direction of the first flange 2, reducing the effect on the strength of the second flange 2, and the second portion 32 being designed to be larger in the width direction of the second flange 6, increasing the amount of air flow entering from the opening 3 as much as possible.

In some embodiments, as shown in fig. 1, the openings 3 are arranged at intervals along the length of the first flange 2.

In this embodiment, by providing a plurality of intermittent openings 3, the influence on the structural strength of the return air frame can be reduced as much as possible while the return air volume is improved.

Alternatively, the opening 3 extends continuously along the length of the first flange 2.

In some embodiments, as shown in fig. 2, each of the four mounting plates 1 is provided with a first flange 2, and the openings 3 are provided at least in the first flange 2 extending in the length direction of the frame structure.

Because the mounting plate 1 that extends along the length direction of the frame structure is longer, the influence on the overall strength of the frame structure is larger, and the influence of the first flanges 2 arranged on the air return quantity is relatively larger by the two mounting plates 1, the opening 3 is arranged on at least the two first flanges 2, so that a more remarkable effect can be obtained in the aspect of improving the overall strength of the frame structure, the influence of the first flanges 2 on the wind resistance can be reduced as much as possible, and the air return quantity is ensured.

In some embodiments, as shown in fig. 3 and 5, the first flange 2 is provided with a recess 4, and the recess 4 is entirely recessed toward the inside of the frame structure. For example, the first flange 2 has a thin plate structure, the inner and outer surfaces of the concave portion 4 are both concave toward the inside of the frame structure, and the concave portion 4 may be formed by punching. For example, the shape of the concave portion 4 may be oblong, circular, etc., and this way not only can obtain a superior effect of increasing the strength of the frame structure, but also can reduce the processing difficulty.

In the embodiment, the concave part 4 is arranged on the first flanging 2, so that the integral strength of the frame structure can be increased through the profiling structure, the vibration resistance and deformation resistance of the whole machine are enhanced to a certain extent, and the processing is easy.

Moreover, as shown in fig. 4, since the concave portion 4 protrudes relative to other areas of the inner wall of the first flange 2, it can guide the air flow entering from the opening 3, and guide the air flow to flow in the direction away from the first flange 2 in the arrow direction, thereby improving the return air efficiency. In order to optimize the drainage effect, the inner side wall of the concave portion 4 in the width direction of the first flange 2 gradually decreases in size along the direction of the wind, i.e., the inner side wall of the concave portion 4 forms a slope. For example, the inner side wall of the recess 4 may be designed as a trapezoid, an arc, a triangle, etc. in the cross section of the first flange 2.

In some embodiments, as shown in fig. 2, the first flange 2 is provided with a plurality of recesses 4 spaced apart along its length. The structure can obtain better effect of increasing the strength of the frame structure and reduce the processing difficulty. Alternatively, the recess 4 extends continuously in the length direction of the first flange 2.

In some embodiments, the recess 4 is arranged in correspondence with the opening 3 in the length direction of the first flange 2. The arrangement mode can not only increase the structural strength of the frame, but also can guide the air flow entering from the corresponding opening 3 through the concave part 4, and optimize the flow guiding effect. Alternatively, the recess 4 and the opening 3 may be offset in the longitudinal direction of the first flange 2.

In some embodiments, as shown in fig. 3, 5 and 6, a guiding portion 5 is connected to the end of the second flange 6 remote from the first flange 2, the guiding portion 5 being configured to guide the air flow entering from the opening 3 into the interior of the frame structure.

In the embodiment, the second flanging 6 is provided with the guide part 5, so that the overall strength of the installation edge of the frame structure can be increased, and the vibration resistance and deformation resistance of the whole machine are enhanced to a certain extent. Furthermore, the guide portion 5 guides the air flow entering through the opening 3 to the inside of the frame structure.

In some embodiments, as shown in fig. 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 an end of the second turn-up edge 6 away from the first turn-up edge 2 and extends toward a direction close to the mounting plate 1, and the second guide plate 52 is connected to an end of the first guide plate 51 away from the second turn-up edge 6 and extends toward a direction away from the first turn-up edge 2.

Wherein the first guide plate 51 gradually increases from the second turn-up 6 to the distance between the second guide plate 52 and the second turn-up 6, forming a slope, so that the air flow entering from the opening 3 flows toward the inside (rear) of the frame structure while flowing toward the mounting plate 1. The second guide plate 52 may extend parallel to the mounting plate 1. In order to optimize the guiding effect on the air flow, the second flange 6 and the first guide plate 51 can be transited by an arc, and the first guide plate 51 and the second guide plate 52 can be transited by the air flow.

Moreover, as shown in fig. 3, since the guide portion 5 protrudes toward the inside of the frame structure with respect to the inner wall of the second flange 6, it is possible to guide the air flow entering from the opening 3 in the direction of the arrow toward the direction away from the first flange 2, and the return air efficiency is improved.

In some embodiments, the openings 3 are disposed at intervals along the length direction of the first flange 2, the guide portions 5 are disposed at intervals along the length direction of the second flange 6, the plurality of guide portions 5 are disposed in one-to-one correspondence with the plurality of openings 3, and the guide portions 5 at least partially cover the area where the openings 3 are disposed.

In this embodiment, the guide portions 5 are arranged at intervals, so that the weight of the return air frame structure can be reduced while the air flow entering from the opening 3 is guided well.

In some embodiments, as shown in fig. 1, the outer edge of the connection between the first flange 2 and the mounting plate 1 is provided with a third concave portion 8, and the third concave portion 8 is concave toward the inside of the frame structure as a whole.

For example, the third concave portion 8 may be a triangular rib-shaped, i.e., a triangular groove is formed inward at the outer edge of the junction of the first flange 2 and the mounting plate 1, and a convex structure is formed toward one side in the frame structure at the junction of the first flange 2 and the mounting plate 1 for reinforcement. For example, three third concave portions 8 are provided on the third plate 13 at intervals along the length direction thereof, and one third concave portion 8 is provided on the first plate 11 at a position close to the third plate 13. For example, the third recess 8 may be formed by stamping.

This embodiment can have a great effect on increasing the strength, deformation resistance, etc. of the parts of the mounting plate 1 by providing the third recessed portion 8, thereby increasing the overall strength of the frame structure. And the structure is simple, the overall processing difficulty is low, and the processing cost is low.

For example, the whole return air frame adopts a 0.6mm thick steel plate, compared with the common 0.8mm thick steel plate and the common 0.95mm thick steel plate, the volume of the material is reduced by 25% and 37% respectively, the material cost can be greatly reduced by adopting thinner materials, meanwhile, the thinner materials have greater advantages in the production links such as mould manufacturing and the like, the cost and the processing difficulty are effectively reduced under the condition that the whole performance of the frame structure is not influenced, and the production efficiency and the finished product qualification rate are improved.

The return air frame structure of the present disclosure not only enhances the overall strength of the frame strength, but also is easy to process, simultaneously reduces wind resistance, and increases the air quantity.

Secondly, the present disclosure also provides an air conditioning apparatus, including the return air frame structure of the above embodiment. Because the air return frame structure can reduce wind resistance and increase air return quantity, the air quantity of the whole air conditioning equipment can be improved, and the air conditioning performance is optimized.

In some embodiments, as shown in fig. 4, the air conditioning apparatus further comprises a fan blade 9 provided in the frame structure and configured to draw outside air into the frame structure through the return air inlet. For example, at least two fan blades 9 are arranged in the frame structure at intervals along the length direction of the frame structure so as to increase the air suction power.

For example, the fan blade 9 is a centrifugal fan blade, because of the air suction characteristics of two sides of the centrifugal fan blade, wind can gather at two sides of the fan blade along the axial direction, namely, in the left-right direction in fig. 4, the air outlet direction is perpendicular to the air inlet direction and faces the inside of the frame structure, at this time, the air quantity at two sides of the fan blade 9 is the majority of the air quantity of the whole machine, and at this time, the first flange 2 used for assembly needs can block part of the air to enter, so that the air quantity is reduced. Through setting up opening 3, recess 4 and guiding part 5, when wind gets into and gathers in fan blade along axial both sides from the return air inlet, a portion wind gets into from opening 3's first part 31, and another portion wind gets into from opening's second part 32, through the water conservancy diversion effect of recess 4 inside wall, will have the wind to flow also at the rear of first turn-ups 2 to make the return air area increase of complete machine, the amount of wind also improves with the heat transfer ability of complete machine thereupon. After the diversion function of the concave part 4 is completed, the guiding part 5 also starts to play a role in diversion, namely guiding wind to a deeper part behind the first flanging 2, thereby further increasing the return air area to basically realize the consistent air quantity with the condition without the first flanging 2.

The strength of the frame structure can be enhanced by providing the concave part 4 and the guide part 5 while increasing the air quantity, so that the vibration resistance and deformation resistance of the whole machine are enhanced to a certain extent. Moreover, the structure is simple and easy to process.

In the embodiment shown in fig. 4, the openings 3 are formed in the first flange 2 above the fan blade 9, and four openings 3 are formed in the first flange 2 along the length direction of the frame structure at intervals, and from the viewpoint of guaranteeing the uniformity of the overall strength of the return air frame, the four openings 3 are uniformly formed, that is, the distances between two adjacent openings 3 are equal.

In other embodiments, 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 outside the fan blade 9 in the length direction of the frame structure.

Considering that when the fan blade 9 works, wind can gather at two sides of the fan blade 9 along the axial direction, at this time, the air quantity at two sides of the fan blade 9 is the majority of the air quantity of the whole machine, and the first flanging 2 required to be arranged in assembly can block part of the wind from entering, so that the air quantity is reduced. In this embodiment, the opening 3 is arranged at the outer side of the fan blade 9, so that more wind at the side of the fan blade 9 can be allowed to enter the frame structure, and the effect of increasing the air return quantity is better.

In some embodiments, as shown in fig. 4, 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 end face of the fan blade 9 closest to the center position is D, and the value range of D is [1/8L,1/4L ].

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

According to the embodiment, on the basis that the openings 3 are arranged in the areas with larger air volumes at the two sides of the fan blades 9, the specific positions of the openings 3 are distributed according to the positions of the fan blades 9, the openings 3 can be arranged in the positions close to the end faces of the fan blades 9, the areas have larger air volumes, the larger air volumes can be allowed to enter the frame structure from the openings 3, and the air return volume is increased more effectively.

In some embodiments, as shown in fig. 4, two fan blades 9 are disposed in the frame structure at intervals along the length direction, four openings 3 are disposed on the same first flange 2 at intervals, and two sides of each fan blade 9 are respectively provided with one opening 3.

For example, four openings 3 are arranged on the first flange 2 above the fan blades 9 at intervals, one opening 3 is respectively arranged on two sides of one fan blade 9, one opening 3 is respectively arranged on two sides of the other fan blade 9, and the distances between the central positions of all the openings 3 and the end faces of the nearest fan blade 9 can be the same, or the openings are arranged according to actual test results, so that the air return quantity is improved to the greatest extent.

This embodiment is to setting up the structure of two fan blades 9 in the frame construction, all is equipped with an opening 3 in every region that is close to fan blade 9 terminal surface, all can realize supplementary return air through opening 3 in the rich wind region to improve the return air effect.

In some embodiments, the air conditioning apparatus comprises an air duct machine. Alternatively, the air conditioning apparatus may be another air conditioner having the return air frame structure of the above embodiment.

The return air frame structure is an important component part in the air duct machine, and the main function of the return air frame structure is to ensure the smoothness of the air duct connected by the fan blade 9 and the outside, thereby ensuring the air quantity and the performance of the whole machine. Therefore, the return air frame structure is an important part affecting the whole machine air quantity and performance of the air pipe machine. Meanwhile, the return air frame structure is a part of the outer shell of the whole machine, so that the structural strength of the return air frame structure can directly influence the vibration resistance, deformation resistance and other performances of the whole machine. The air return frame has high structural strength, small wind resistance and low cost, and can well solve the problems.

The foregoing is illustrative of the present disclosure and is not to be construed as limiting thereof, but rather as various modifications, equivalent arrangements, improvements, etc., which are within the spirit and principles of the present disclosure.

Claims (18)

1. An air return frame structure, comprising: the four mounting plates (1) are connected with each other to form a frame structure with an air return opening (10);

wherein, at least one mounting panel (1) is being located one side of return air inlet (10) is connected with first turn-ups (2), first turn-ups (2) for mounting panel (1) orientation return air inlet (10) are buckled, first turn-ups (2) are kept away from one end of mounting panel (1) is connected with second turn-ups (6), second turn-ups (6) orientation frame structure's inside extends, first turn-ups (2) with the region that second turn-ups (6) are connected is equipped with opening (3), opening (3) form the air feed stream and get into frame structure's passageway.

2. The return air frame structure according to claim 1, wherein the opening (3) comprises a first portion (31) and a second portion (32), the first portion (31) being located on the first flange (2) and the second portion (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 dimension along a width direction of the first flange (2), and the second portion (32) has a second dimension along a width direction of the second flange (6), the first dimension being smaller than the second dimension.

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

5. The return air frame structure according to claim 1, wherein four mounting plates (1) are each provided with the first flange (2), and the opening (3) is provided at least in the first flange (2) extending in the longitudinal direction of the frame structure.

6. The return air frame structure of any one of claims 1-5, wherein,

the first flanging (2) is provided with a concave part (4), and the whole concave part (4) is concave towards the inside of the frame structure.

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

8. The return air frame structure according to claim 7, wherein the recess (4) and the opening (3) are disposed 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 the second flange (6) at an end thereof remote from the first flange (2), the guide portion (5) being configured to guide the air flow entering from the opening (3) into the frame structure.

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

11. The return air frame structure according to claim 9, wherein the guide portion (5) includes a first guide plate (51) and a second guide plate (52), the first guide plate (51) is connected to an end of the second turn-up edge (6) away from the first turn-up edge (2) and extends toward a direction close to the mounting plate (1), and the second guide plate (52) is connected to an end of the first guide plate (51) away from the second turn-up edge (6) and extends toward a direction away from the first turn-up edge (2).

12. The return air frame structure according to any one of claims 1 to 5, wherein a third concave portion (8) is provided at an outer edge of a connection portion of the first flange (2) and the mounting plate (1), and the third concave portion (8) is integrally concave toward the inside of the frame structure.

13. An air conditioning apparatus comprising a return air frame structure as claimed in any one of claims 1 to 12.

14. An air conditioning unit according to claim 13, further comprising a fan blade (9) provided within the frame structure and configured to draw outside air into the frame structure through the return air inlet.

15. An air conditioning unit according to claim 14, characterized in that the axial direction of the fan blade (9) coincides with the length direction of the frame structure, the opening (3) being provided at least on the first flange (2) extending in the length direction of the frame structure, the opening (3) being located outside the fan blade (9) in the length direction of the frame structure.

16. An air conditioning unit according to claim 15, characterized in that 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 end face of the fan blade (9) closest to the center position is D, and the value range of D is [1/8L,1/4L ].

17. An air conditioning unit according to claim 15, wherein two fan blades (9) are arranged in the frame structure at intervals along the length direction, four openings (3) are arranged on the same first flanging (2) at intervals, and two sides of each fan blade (9) are respectively provided with one opening (3).

18. The air conditioning apparatus of claim 13, wherein the air conditioning apparatus comprises an air duct machine.