Flow equalizing plate structure, flow equalizing and resistance reducing device, centrifugal fan structure and air conditioning system

Abstract

The present invention provides a flow equalizing plate structure, a flow equalizing and resistance reducing device, a centrifugal fan structure and an air conditioning system, which solve the problems in the prior art that the air flow blown by the centrifugal fan to the heat exchanger has uneven flow distribution and relatively high wind speed. The present invention provides a flow equalizing and resistance reducing device. First, the air supply speed of the centrifugal fan is reduced through a first diffuser section, and a flow deflector is arranged on the first diffuser section to perform preliminary flow equalization on the area with a large flow rate; the terminal of the first diffuser section is connected to a second diffuser section, and a flow equalizing plate structure is installed in the second diffuser section. The flow equalizing plate structure faces the outlet of the first diffuser section to equalize the air flow from the volute of the centrifugal fan, reduce the wind speed and reduce the local loss.

Description

Technical Field

[0001] The present invention relates to the technical field of fans, and in particular, to a flow equalizing plate structure, a flow equalizing and resistance reducing device, a centrifugal fan structure, and an air conditioning system. Background Art

[0002] During the actual operation of a centrifugal fan, due to the influence of centrifugal force, the gas has a radial component velocity. Refer to Figure 1 , the radial component velocity causes the flow rate at the outlet of the volute to gradually increase from the lower edge to the upper edge. In addition, since the wind blades are in reality, it gradually increases from the front disc to the middle disc of the blade. The above two situations lead to uneven flow rate distribution at the outlet of the centrifugal fan volute.

[0003] After the gas passes through the volute, a large part of the dynamic pressure has been converted into static pressure. However, sometimes the wind speed at the outlet of the volute is still relatively high. Especially in an environment with a narrow space, the installation space of each component is limited, making the outlet of the centrifugal fan component close to other components. For example, when installing a surface cooler on the outlet side of the fan, when reaching the surface cooler, the flow rate distribution is uneven and the wind speed is relatively large, reducing the effective heat exchange area of the surface cooler and making it difficult to achieve an ideal heat exchange effect. Summary of the Invention

[0004] The purpose of the present invention is to provide a flow equalizing plate structure, a flow equalizing and resistance reducing device, a centrifugal fan structure, and an air conditioning system to solve the problems of uneven flow rate and relatively large wind speed in the air flow blown by the centrifugal fan to the heat exchanger in the prior art. The preferred technical solutions provided by the present invention can produce many technical effects, which will be elaborated in detail below.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A flow equalizing plate structure provided by the present invention includes a flow equalizing main body part and an edge area part. Among them, the edge area part is formed on the edge side of the flow equalizing main body part. Flow equalizing holes are distributed on the flow equalizing main body part, and the opening area per unit area of the edge area part is greater than the opening area per unit area of the flow equalizing main body part; the flow equalizing plate structure is a flat plate structure, or the flow equalizing plate structure is a folded plate structure and there is an included angle between the flow equalizing main body part and the edge area part.

[0007] Further, one side edge of the flow equalizing main body part is an exposed side edge, and the exposed side edge forms the edge of the flow equalizing plate structure; when the flow equalizing plate structure is in the installed state, the exposed side edge cooperates with the inner side surface where the wind force is concentrated in the air duct.

[0008] Further, from the exposed side edge to the direction away from the exposed side edge, the area size of the flow equalizing holes shows a gradually increasing trend.

[0009] Further, other sides of the flow equalizing main body part except the exposed side are respectively connected to the corresponding edge area parts, and two adjacent edge area parts in the circumferential direction are connected to each other.

[0010] Further, the included angle between the flow equalizing main body part and the edge area part is an obtuse angle, and when the flow equalizing plate structure is in the installed state, the free end of the edge area part extends obliquely in the direction against the airflow flowing through the flow equalizing and drag reducing device.

[0011] Further, the included angle range between the flow equalizing main body part and the edge area part is 100° to 110°.

[0012] Further, the edge area part has a frame structure.

[0013] Further, more than one frame-shaped hole is formed on each edge area part, and the frame-shaped holes on the flow equalizing plate structure are distributed along the circumferential direction of the flow equalizing plate structure.

[0014] The present invention provides a flow equalizing and drag reducing device. A diffuser guide cavity is formed inside the flow equalizing and drag reducing device. The flow equalizing and drag reducing device includes the flow equalizing plate structure as described above, and the flow equalizing plate structure is arranged in the diffuser guide cavity.

[0015] Further, the flow equalizing and drag reducing device further includes a guide plate structure. The guide plate structure and the flow equalizing plate structure are sequentially arranged in the diffuser guide cavity along the direction of the airflow flowing through the flow equalizing and drag reducing device. The guide plate structure is used to guide the airflow concentrated therein to both sides.

[0016] Further, one inner side surface of the flow equalizing and drag reducing device is a wind concentration inner side surface, and the guide plate structure is arranged on the wind concentration inner side surface.

[0017] Further, the center line along the direction of the airflow flowing through the flow equalizing and drag reducing device on the airflow concentration surface is used as a reference line. The guide plate structure includes a plurality of guide plates. The guide plates are spaced apart along the direction perpendicular to the reference line on the airflow concentration surface. From the air inlet side to the air outlet side of the flow equalizing and drag reducing device, the distance between the guide plate and the reference line gradually increases.

[0018] Further, the guide plates are symmetrically distributed with the reference line as the symmetry line. The guide plates located on the same side of the reference line are arranged parallel to each other, and the guide plates are parallel to the inner side surface on the corresponding side of the flow equalizing and drag reducing device.

[0019] Furthermore, the flow equalizing and resistance reducing device includes a first diffuser section and a second diffuser section connected to the first diffuser section. The cross-sectional area of the first diffuser section and the cross-sectional area of the second diffuser section increase along the direction of the airflow flowing through the flow equalizing and resistance reducing device. The flow equalizing plate structure and the flow guiding plate structure are respectively arranged in the first diffuser section and the second diffuser section.

[0020] Furthermore, the first diffuser section includes a third side plate and a fourth side plate. The third side plate and the fourth side plate are oppositely arranged. From the air inlet side to the air outlet side of the flow equalizing and resistance reducing device, the third side plate and the fourth side plate incline away from the center of the first diffuser section.

[0021] Furthermore, the obtuse angle between the plane perpendicular to the flow guiding channel and the third side plate is 95° - 100°; the obtuse angle between the plane perpendicular to the flow guiding channel and the fourth side plate is 95° - 100°.

[0022] Furthermore, the four side plates of the second diffuser section are all inclined, and the second diffuser section has a trumpet-shaped flared structure relative to the first diffuser section.

[0023] The present invention provides a centrifugal fan structure, which includes a centrifugal fan and the flow equalizing and resistance reducing device. The flow equalizing and resistance reducing device is connected to the centrifugal fan, and the flow equalizing and resistance reducing device is used to be connected to a heat exchanger.

[0024] The present invention provides an air conditioning system, which includes the flow equalizing and resistance reducing device.

[0025] The present invention provides a flow equalizing plate structure, which includes a flow equalizing main body part and an edge area part. When the flow equalizing plate structure is installed in the diffuser cavity, very little air flows through the edge area part. Therefore, the opening area per unit area of the edge area part is designed to be larger than the opening area per unit area of the flow equalizing main body part, which is convenient for the air to pass through the edge area part and has the effect of flow equalization. When the flow equalizing plate structure is a flat plate structure, after the air blows to the flow equalizing main body part, some of the air will flow to both sides, forming eddy currents, which have a greater impact on the air outlet from the edge area part. However, by designing an angle between the flow equalizing main body part and the edge area part, the impact of the eddy currents on the air outlet from the edge area part is reduced to a certain extent.

[0026] The preferred technical solution of the present invention can at least further produce the following technical effects:

[0027] One side of the flow equalizing main body part is an exposed side edge, and the exposed side edge forms the edge of the flow equalizing plate structure. When the flow equalizing plate structure is in the installed state, the exposed side edge cooperates with the inner side surface where the wind force is concentrated in the air duct (diffuser cavity), so as to achieve a better flow equalizing effect.

[0028] The flow equalizing holes on the flow equalizing main body are arranged in the direction from the exposed side to the side away from the exposed side, and the area of the flow equalizing holes shows a gradually increasing trend to achieve a better flow equalizing effect;

[0029] The present invention provides a flow equalizing and resistance reducing device. First, the air supply speed of the centrifugal fan is reduced through the first diffuser section. A deflector is arranged on the first diffuser section to preliminarily equalize the flow in the area with a larger flow rate. The terminal of the first diffuser section is connected to the second diffuser section, and a flow equalizing plate structure is installed in the second diffuser section. The flow equalizing plate structure faces the outlet of the first diffuser section to equalize the air flow from the volute of the centrifugal fan, reduce the wind speed, and reduce local losses. Brief Description of the Drawings

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0031] Figure 1 is a schematic structural view of the flow equalizing and resistance reducing device provided by the embodiment of the present invention in a working state;

[0032] Figure 2 is a top view schematic of the flow equalizing and resistance reducing device provided by the embodiment of the present invention;

[0033] Figure 3 is a front view schematic of the flow equalizing and resistance reducing device provided by the embodiment of the present invention;

[0034] Figure 4 is a schematic structural view of the flow equalizing plate structure provided by the embodiment of the present invention;

[0035] Figure 5 is a top view schematic of the flow equalizing plate structure provided by the embodiment of the present invention;

[0036] Figure 6 is a right view schematic of the flow equalizing plate structure provided by the embodiment of the present invention;

[0037] Figure 7 is a schematic structural view of the first diffuser section and the deflector provided by the embodiment of the present invention;

[0038] Figure 8 is a schematic view of the distribution of the deflector on the first diffuser section provided by the embodiment of the present invention.

[0039] In the figure: 1 - flow - equalizing plate structure; 11 - flow - equalizing main body part; 12 - edge area part; 13 - flow - equalizing holes; 14 - exposed side edge; 15 - frame - shaped hole; 2 - deflector; 3 - first diffuser section; 301 - first side plate; 302 - second side plate; 303 - third side plate; 304 - fourth side plate; 4 - second diffuser section; 5 - centrifugal fan; 6 - surface cooler; 7 - flexible connection device. Detailed implementation mode

[0040] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other implementation manners obtained by those of ordinary skill in the art without creative efforts fall within the scope protected by the present invention.

[0041] Embodiment 1:

[0042] The present invention provides a flow - equalizing plate structure, including a flow - equalizing main body part 11 and an edge area part 12. Among them, the edge area part 12 is formed on the edge side of the flow - equalizing main body part 11, and flow - equalizing holes 13 are distributed on the flow - equalizing main body part 11. When the flow - equalizing plate structure is installed in the diffuser cavity, very little air flow passes through the edge area part 12. Therefore, the opening area per unit area of the edge area part 12 is designed to be larger than that of the flow - equalizing main body part 11 per unit area, facilitating the air flow to pass through the edge area part 12; the flow - equalizing plate structure 1 is a flat plate structure, or the flow - equalizing plate structure 1 is a folded - plate structure and there is an included angle between the flow - equalizing main body part 11 and the edge area part 12. Refer to Figure 4 , which shows that the flow - equalizing plate structure 1 is a folded - plate structure.

[0043] As an optional implementation manner, one side edge of the flow - equalizing main body part 11 is an exposed side edge 14, and the exposed side edge 14 forms the edge of the flow - equalizing plate structure 1; when the flow - equalizing plate structure is in the installed state, the exposed side edge 14 cooperates with the inner side surface where the wind force is concentrated in the air duct (diffuser cavity). Refer to Figure 3 , which shows the exposed side edge 14. Refer to Figure 1 , during the actual operation of the centrifugal fan, affected by the centrifugal force, the gas has a radial component velocity. The radial component velocity makes the flow rate at the outlet of the volute gradually increase from the lower edge to the upper edge. At this time, when the flow - equalizing plate structure is installed in the diffuser cavity, it is necessary to make the exposed side edge 14 of the flow - equalizing main body part 11 cooperate with the top cavity surface (the inner side surface where the wind force is concentrated) of the diffuser cavity to facilitate better flow - equalizing effect.

[0044] As an alternative implementation, for the uniform flow holes 13 corresponding to the positions with large airflows, the area is small, and for the positions with small airflows, the area of the uniform flow holes 13 is large, which can better achieve the effect of uniform flow. At the same time, in combination with the working characteristics of the centrifugal fan 5, the uniform flow holes 13 on the uniform flow main body 11 are arranged in the direction from the exposed side 14 to the direction away from the exposed side 14, and the area of the uniform flow holes 13 gradually increases, so as to achieve a better uniform flow effect. Of course, it can also be set as follows: from the middle position of the exposed side 14 to the middle position away from the exposed side 14, the area of the uniform flow holes 13 gradually increases, that is, see Figure 4 , for the uniform flow holes 13 in the same row along the horizontal direction, the area sizes can be different. In addition, the uniform flow holes 13 can not only be circular holes, but can also be quadrilateral holes, hexagonal holes, etc.

[0045] As an alternative implementation, see Figure 4 , there is an edge region part 12, and one or more rows of uniform flow holes 13 are arranged on the side close to the uniform flow main body 11. At this time, the uniform flow holes on the edge region part 12 also need to meet the characteristic that "the uniform flow holes 13 are arranged in the direction from the exposed side 14 to the direction away from the exposed side 14, and the area of the uniform flow holes 13 gradually increases". Of course, the edge region part 12 may not be provided with uniform flow holes 13 either.

[0046] Regarding the specific structure of the uniform flow plate structure, it can be as follows: the other sides of the uniform flow main body 11 except the exposed side 14 are respectively connected to the corresponding edge region parts 12, and two adjacent edge region parts 12 in the circumferential direction are connected. See Figure 4 , which shows that the uniform flow main body 11 is square, and edge region parts 12 are arranged on three side edges of the uniform flow main body 11. The included angle between the uniform flow main body 11 and the edge region part 12 is an obtuse angle, and when the uniform flow plate structure 1 is in the installed state, the free end of the edge region part 12 extends obliquely in the direction against the airflow flowing through the uniform flow and resistance reduction device. Preferably, the range of the included angle β between the uniform flow main body 11 and the edge region part 12 is 100° to 110°. When the included angle between the uniform flow main body 11 and the edge region part 12 is close to 90°, when the uniform flow plate structure is placed into the diffuser cavity facing the air inlet of the diffuser cavity, the proportion of the edge region part 12 in the cross-section of the diffuser cavity is small, and it is difficult for the edge region part 12 to achieve the set effect; when the included angle between the uniform flow main body 11 and the edge region part 12 is very large, for example, the two are 180° (that is, the uniform flow plate structure is a flat plate structure), after the airflow blows to the uniform flow main body 11, part of the airflow will flow to both sides, forming a vortex, which has a greater impact on the air outlet from the edge region part 12.

[0047] As an alternative implementation, the edge region part 12 has a frame structure. See Figure 4, which shows the edge region part 12. The frame structure is conducive to the formation of relatively large holes on the edge region part 12. Specifically, more than one frame-shaped hole 15 (the area of the frame-shaped hole 15 is larger than that of the flow equalizing hole 13) is formed on each edge region part 12, and the frame-shaped holes 15 on the flow equalizing plate structure 1 are distributed along the circumferential direction of the flow equalizing plate structure 1. Preferably, the included angle β between the flow equalizing main body part 11 and the edge region part 12 is set in the range of 100° to 110°. Refer to Figure 4 , the flow equalizing plate structure is a left-right symmetric structure. For the edge region part 12 on the left side of the flow equalizing main body part 11, there is an included angle between the frame edge connected to the flow equalizing main body part 11 and the flow equalizing main body part 11. For the edge region part 12 on the lower side of the flow equalizing main body part 11, a row of flow equalizing holes 13 is provided thereon. The included angle between the edge region part 12 on the left side and the edge region part 12 on the lower side is γ. After the air flow blows to the flow equalizing main body part 11, part of the air flow will flow to both sides. Due to the included angle between the edge region part 12 and the flow equalizing main body part 11, the blocking effect of the flowing air flow by the edge region part 12 will change the flow direction, and finally the influence of the formed eddy current pair on the air outlet from the edge region part 12 is relatively small.

[0048] Embodiment 2:

[0049] A flow equalizing and resistance reducing device, an expansion diversion cavity is formed inside the flow equalizing and resistance reducing device. The flow equalizing and resistance reducing device includes the flow equalizing plate structure 1 described in Embodiment 1 of the present invention. The flow equalizing plate structure 1 is arranged in the expansion diversion cavity, and the flow equalizing plate structure 1 can be fixed by bolts or welding.

[0050] As an optional implementation manner, the flow equalizing and resistance reducing device further includes a guide plate structure. The guide plate structure and the flow equalizing plate structure 1 are sequentially arranged in the expansion diversion cavity along the direction of the air flow flowing through the flow equalizing and resistance reducing device. The guide plate structure is used to divert the concentrated air flow to both sides, and the guide plate structure plays a role in initial flow equalization.

[0051] Specifically, one of the inner sides of the flow equalizing and resistance reducing device is a wind force concentrating inner side, and the guide plate structure is arranged on the wind force concentrating inner side. Refer to Figure 1 , during the actual operation of the centrifugal fan, affected by the centrifugal force, the gas has a radial component velocity. The radial component velocity causes the flow rate at the outlet of the volute to gradually increase from the lower edge to the upper edge. At this time, the upper cavity wall of the expansion diversion cavity of the flow equalizing and resistance reducing device forms a wind force concentrating inner side, the guide plate structure is arranged on the wind force concentrating inner side, and the exposed side edge 14 of the flow equalizing plate structure 1 cooperates with the upper cavity wall of the expansion diversion cavity.

[0052] Regarding the deflector structure, specifically, the center line along the direction of the airflow flowing through the flow equalizing and resistance reducing device on the airflow concentration surface is used as the reference line. The deflector structure includes a plurality of deflectors 2, and the deflectors 2 are spaced apart along a direction perpendicular to the reference line on the airflow concentration surface. From the air inlet side to the air outlet side of the flow equalizing and resistance reducing device, the distance between the deflector 2 and the reference line gradually increases. See Figure 7 , which shows the deflector 2. There is a gap between the bottom of the deflector 2 and the lower cavity wall of the diffuser deflector cavity. The deflector 2 mainly deflects the area where the wind force is concentrated in the diffuser deflector cavity. Specifically, the deflector 2 is symmetrically distributed with the reference line as the symmetry line. The deflectors 2 located on the same side of the reference line are arranged parallel to each other, and the deflector 2 is parallel to the inner side surface of the corresponding side on the flow equalizing and resistance reducing device. See Figure 8 , which simply shows the distribution of the deflector 2. From the air inlet side to the air outlet side of the flow equalizing and resistance reducing device, the deflector 2 deviates away from the reference line, so that the concentrated airflow is deflected to both sides, which is beneficial to flow equalization. In addition, regarding the number of the deflectors 2, the distance between two adjacent deflectors 2, as well as the width and length of the deflector 2, corresponding adjustments can be made according to the actual situation.

[0053] As an optional implementation manner, the flow equalizing and resistance reducing device includes a first diffuser section 3 and a second diffuser section 4 connected to the first diffuser section 3. The cross-sectional area of the first diffuser section 3 and the cross-sectional area of the second diffuser section 4 show an increasing trend along the direction of the airflow flowing through the flow equalizing and resistance reducing device. The flow equalizing plate structure 1 and the deflector structure are respectively arranged in the first diffuser section 3 and the second diffuser section 4.

[0054] Regarding the first diffuser section 3, specifically, the first diffuser section 3 includes a third side plate 303 and a fourth side plate 304, and the third side plate 303 and the fourth side plate 304 are oppositely arranged. From the air inlet side to the air outlet side of the flow equalizing and resistance reducing device, the third side plate 303 and the fourth side plate 304 incline away from the center of the first diffuser section 3. The first diffuser section 3 further includes a first side plate 301 and a second side plate 302, and the first side plate 301 and the second side plate 302 are arranged parallel to each other. The third side plate 303 and the fourth side plate 304 are respectively arranged on both sides of the first side plate 301 and the second side plate 302. The first side plate 301, the second side plate 302, the third side plate 303 and the fourth side plate 304 enclose a diversion channel, and the deflector structure is arranged on the inner side of the first side plate 301 or the second side plate 302.

[0055] In addition, the obtuse angle between the plane perpendicular to the diversion channel and the third side plate 303 is 95° - 100°; the obtuse angle between the plane perpendicular to the diversion channel and the fourth side plate 304 is 95° - 100°. The third side plate 303 and the fourth side plate 304 are symmetric about the left and right. The third side plate 303 and the fourth side plate 304 should not be too large, as too large an angle will increase local losses.

[0056] Regarding the second diffuser section 4, specifically, the four side plates of the second diffuser section 4 are all inclined, and the second diffuser section 4 has a horn-shaped flared structure relative to the first diffuser section 3. Refer to Figure 1 , which shows the second diffuser section. The flow equalizing plate structure 1 is arranged in the second diffuser section 4, and the flow equalizing plate structure 1 is aligned with the air inlet between the first diffuser section 3 and the second diffuser section 4.

[0057] Embodiment 3:

[0058] A centrifugal fan structure includes a centrifugal fan 5 and the flow equalizing and resistance reducing device described in Embodiment 2. The flow equalizing and resistance reducing device is connected to the centrifugal fan 5 and is used to be connected to a heat exchanger. The centrifugal fan 5 can be a double-inlet centrifugal fan or a single-inlet centrifugal fan.

[0059] Refer to Figure 1 , the flow equalizing and resistance reducing device is installed and connected to the volute outlet of the centrifugal fan 5 through a flexible connection device 7 to serve as the subsequent air duct of the centrifugal fan. The terminal is connected to a finned tube cooler 6. In a relatively limited space, it has a significant effect on improving the air supply uniformity and reducing the local resistance.

[0060] When the centrifugal fan structure works, first, the air supply speed of the centrifugal fan 5 is reduced through the first diffuser section 3. A deflector 2 is arranged on the first diffuser section to preliminarily equalize the flow in the area with a large flow rate. The terminal of the first diffuser section 3 is connected to the second diffuser section 4. The flow equalizing plate structure 1 is installed in the second diffuser section 4. The flow equalizing plate structure 1 is aligned with the outlet of the first diffuser section 3. The structural characteristics of the flow equalizing plate structure 1 (refer to Figure 4 , the aperture gradually increases from top to bottom, and the periphery uses polygonal holes), equalizes the air supply of the centrifugal fan volute, reduces the wind speed, and reduces the local loss.

[0061] Embodiment 4:

[0062] An air conditioning system includes the flow equalizing and resistance reducing device described in Embodiment 2.

[0063] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A current-sharing plate structure, characterized in that, It includes a flow equalizing main body part (11) and an edge area part (12), wherein, the edge area part (12) is formed on the edge side of the flow equalizing main body part (11), flow equalizing holes (13) are distributed on the flow equalizing main body part (11), and the opening area per unit area of the edge area part (12) is larger than that of the flow equalizing main body part (11); the flow equalizing plate structure (1) is a flat plate structure, or the flow equalizing plate structure (1) is a folded plate structure and there is an included angle between the flow equalizing main body part (11) and the edge area part (12); one side edge of the flow equalizing main body part (11) is an exposed side edge (14), and the exposed side edge (14) forms the edge of the flow equalizing plate structure (1); when the flow equalizing plate structure is in the installed state, the exposed side edge (14) cooperates with the inner side surface where the wind force is concentrated in the air duct; the edge area part (12) is in a frame structure; more than one frame-shaped hole (15) is formed on each edge area part (12), the area of the frame-shaped hole (15) is larger than that of the flow equalizing hole (13), and the frame-shaped holes (15) on the flow equalizing plate structure (1) are distributed along the circumferential direction of the flow equalizing plate structure (1).

2. The flow equalizing plate structure according to claim 1, wherein, From the exposed side edge (14) to the direction away from the exposed side edge (14), the area of the flow equalizing hole (13) gradually increases.

3. The flow equalizing plate structure according to claim 1, characterized in that The other side edges of the flow equalizing main body part (11) except the exposed side edge (14) are respectively connected to the corresponding edge area parts (12), and two adjacent edge area parts (12) in the circumferential direction are connected.

4. The flow equalizing plate structure according to any one of claims 1-3, characterized in that, The included angle between the flow equalizing main body part (11) and the edge area part (12) is an obtuse angle, and when the flow equalizing plate structure (1) is in the installed state, the free end of the edge area part (12) extends obliquely in the direction against the direction of the air flow flowing through the flow equalizing and resistance reducing device.

5. The flow equalizing plate structure according to claim 4, characterized in that, The included angle range between the flow equalizing main body part (11) and the edge area part (12) is 100° - 110°.

6. A flow equalizing and resistance reducing device, an expanding flow guiding cavity is formed inside the flow equalizing and resistance reducing device, characterized in that, The flow equalizing and resistance reducing device includes the flow equalizing plate structure (1) according to any one of claims 1 - 5, and the flow equalizing plate structure (1) is arranged in the diffuser and flow guiding cavity.

7. The current-sharing and resistance-reducing device according to claim 6, characterized in that, The flow equalizing and resistance reducing device further includes a flow guiding plate structure, the flow guiding plate structure and the flow equalizing plate structure (1) are sequentially arranged in the diffuser and flow guiding cavity along the direction of the air flow flowing through the flow equalizing and resistance reducing device, and the flow guiding plate structure is used for guiding the concentrated air flow to both sides.

8. The current-sharing and resistance-reducing device according to claim 7, wherein, One inner side surface of the flow equalizing and resistance reducing device is an inner side surface where the wind force is concentrated, and the flow guiding plate structure is arranged on the inner side surface where the wind force is concentrated.

9. The current-sharing and resistance-reducing device according to claim 8, wherein The center line along the direction of the air flow flowing through the flow equalizing and resistance reducing device on the air flow concentration surface is used as a reference line, the flow guiding plate structure includes a plurality of flow guiding plates (2), the flow guiding plates (2) are spaced apart along the direction perpendicular to the reference line on the air flow concentration surface, and from the air inlet side to the air outlet side of the flow equalizing and resistance reducing device, the distance between the flow guiding plate (2) and the reference line gradually increases.

10. The current-sharing and resistance-reducing device according to claim 9, characterized in that, The deflector plates (2) are symmetrically distributed with the reference line as the symmetry line. The deflector plates (2) on the same side of the reference line are arranged parallel to each other, and the deflector plates (2) are parallel to the inner side surface of the corresponding side of the flow equalizing and drag reducing device.

11. The current-sharing and resistance-reducing device according to any one of claims 7 to 10, characterized in that, The flow equalizing and drag reducing device includes a first diffuser section (3) and a second diffuser section (4) connected to the first diffuser section (3). The cross-sectional area of the first diffuser section (3) and the cross-sectional area of the second diffuser section (4) increase in the direction of the airflow flowing through the flow equalizing and drag reducing device. The flow equalizing plate structure (1) and the deflector plate structure are respectively arranged in the first diffuser section (3) and the second diffuser section (4).

12. The current-sharing and resistance-reducing device according to claim 11, characterized in that, The first diffuser section (3) includes a third side plate (303) and a fourth side plate (304). The third side plate (303) and the fourth side plate (304) are arranged opposite to each other. In the direction from the air inlet side to the air outlet side of the flow equalizing and drag reducing device, the third side plate (303) and the fourth side plate (304) incline away from the center of the first diffuser section (3).

13. The current-sharing and resistance-reducing device according to claim 12, characterized in that, The obtuse angle between the plane perpendicular to the flow guiding channel and the third side plate (303) is 95° - 100°; the obtuse angle between the plane perpendicular to the flow guiding channel and the fourth side plate (304) is 95° - 100°.

14. The current-sharing and resistance-reducing device according to claim 12, wherein The four side plates of the second diffuser section (4) are all inclined, and the second diffuser section (4) has a trumpet-shaped flaring structure relative to the first diffuser section (3).

15. A centrifugal fan structure, characterized in that, It includes a centrifugal fan and the flow equalizing and drag reducing device according to any one of claims 1 - 14. The flow equalizing and drag reducing device is connected to the centrifugal fan, and the flow equalizing and drag reducing device is used to be connected to a heat exchanger.

16. An air conditioning system, characterized in that, It includes the flow equalizing and drag reducing device according to any one of claims 1 - 14.

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