Axial fan and axial fan combination

Abstract

The utility model provides an axial flow fan and an axial flow fan combination. The axial fan assembly comprises a first axial fan and a second axial fan which are arranged side by side. The second axial fan comprises an impeller and a fan frame. The impeller has a rotating shaft. The fan frame comprises a surrounding wall part and a side guide structure. The surrounding wall part surrounds the axial flow channel and is provided with a first outer wall face facing the first axial flow fan. The impeller is contained in the axial flow channel, and airflow formed by operation of the impeller flows out through the air outlet end of the axial flow channel. The side guide structure is arranged on the end face, connected with the first outer wall face, of the air outlet end in a protruding mode and used for enabling airflow to flow in the first direction at the end face, and an acute angle is formed between the first direction and the normal direction of the first outer wall face.

Description

Technical Field

[0001] The utility model relates to an axial flow fan and an axial flow fan combination, in particular to an axial flow fan and an axial flow fan combination which can change the air outlet direction and reduce the air flow noise. Background Art

[0002] As the performance of electronic devices continues to improve, heat dissipation devices have become an indispensable part of today's electronic devices. Among them, axial-flow fans are widely used heat dissipation devices.

[0003] Diagonal-flow axial fans, with their sideways airflow, offer the advantage of providing wide-area cooling, making them a common type of axial fan for heat dissipation. However, due to their sideways airflow, when used side by side, the lateral airflow between the fans can easily cause turbulence and noise, impacting the performance achieved when used side by side. Furthermore, the dispersed direction of the lateral airflow makes it difficult to target specific airflow directions in cooling applications, limiting their application.

[0004] Therefore, it is necessary to develop an axial flow fan and an axial flow fan combination to improve the above-mentioned deficiencies of the conventional technology. Utility Model Content

[0005] The purpose of the present invention is to provide an axial flow fan, which achieves the effect of changing the sideways air outlet direction by arranging a side guide structure at the air outlet end of the axial flow fan.

[0006] Another object of the present invention is to provide an axial fan assembly that reduces turbulence and noise between axial fans by providing side guide structures on two adjacent outer wall surfaces of adjacent parallel axial fans, thereby improving the performance of the axial fan assembly.

[0007] In order to achieve the above-mentioned purpose, the present invention provides an axial flow fan combination, comprising a first axial flow fan and a second axial flow fan arranged adjacent to each other. The second axial flow fan comprises a first impeller and a first fan frame. The first impeller has a first rotating shaft. The first fan frame comprises a first surrounding wall portion and a first side guide structure. The first surrounding wall portion surrounds a first axial flow channel and the first surrounding wall portion has a first outer wall surface facing the first axial flow fan. The first impeller is accommodated in the first axial flow channel and the first axial flow channel has a first air outlet end, wherein the first airflow formed by the operation of the first impeller flows out of the first axial flow channel through the first air outlet end. The first side guide structure is protruding from the first end surface connected to the first outer wall surface at the first air outlet end, and the first side guide structure is used to make the first branch of the first airflow at the first end surface flow in a first direction, wherein the first direction and the normal direction of the first outer wall surface form a first acute angle.

[0008] In one embodiment, the first axial flow fan includes a second impeller and a second fan frame. The second impeller has a second rotating shaft. The second fan frame includes a second surrounding wall portion and a second side guide structure. The second surrounding wall portion surrounds a second axial flow channel and has a second outer wall surface facing the second axial flow fan. The second impeller is accommodated in the second axial flow channel and the second axial flow channel has a second air outlet end, wherein a second airflow generated by the operation of the second impeller flows out of the second axial flow channel through the second air outlet end. The second side guide structure is protruding from a second end surface connected to the second outer wall surface at the second air outlet end, and the second side guide structure is used to make the second branch of the second airflow at the second end surface flow in a second direction, wherein the second direction forms a second acute angle with the normal direction of the second outer wall surface.

[0009] In one embodiment, the first direction and the second direction are opposite to each other and staggered.

[0010] In one embodiment, the first sub-flow merges with the second sub-flow and flows toward the first merging direction.

[0011] In one embodiment, the system further includes a third axial-flow fan and a third side guide structure. The third axial-flow fan is disposed side by side with the second axial-flow fan near the third outer wall surface of the first surrounding wall portion, with the third outer wall surface facing the third axial-flow fan. The third side guide structure is protruding from a third end surface connected to the third outer wall surface at the first air outlet end. The third side guide structure is configured to direct a third branch of the first airflow at the third end surface toward a third direction, wherein the third direction forms a third acute angle with the normal to the third outer wall surface.

[0012] In one embodiment, the third axial flow fan includes a third impeller and a third fan frame. The third impeller has a third rotating shaft. The third fan frame includes a third surrounding wall portion and a fourth side guide structure. The third surrounding wall portion surrounds a third axial flow channel and has a fourth outer wall surface facing the second axial flow fan. The third impeller is accommodated in the third axial flow channel and the third axial flow channel has a third air outlet end, wherein a fourth airflow generated by the operation of the third impeller flows out of the third axial flow channel through the third air outlet end. The fourth side guide structure is protruding from a fourth end surface connected to the fourth outer wall surface at the third air outlet end. The fourth side guide structure is used to cause a fourth branch of the fourth airflow at the fourth end surface to flow in a fourth direction, wherein the fourth direction forms a fourth acute angle with the normal direction of the fourth outer wall surface.

[0013] In one embodiment, the third direction and the fourth direction are opposite to each other and staggered.

[0014] In one embodiment, the third sub-flow merges with the fourth sub-flow and flows toward the second merging direction.

[0015] In one embodiment, the first lateral guide structure is directly connected to the third lateral guide structure.

[0016] In one embodiment, the first lateral guide structure and the third lateral guide structure are connected via a first connecting structure.

[0017] In one embodiment, the distance between the first axial fan and the first outer wall is negatively correlated with the first acute angle.

[0018] In one embodiment, the first impeller includes a plurality of blades, and the plurality of blades have wavy blade surfaces or flat blade surfaces.

[0019] In order to achieve the above-mentioned purpose, the present invention provides an axial flow fan, comprising a first impeller and a first fan frame. The first impeller has a first rotating shaft. The first fan frame comprises a first surrounding wall portion and a first side guide structure. The first surrounding wall portion surrounds a first axial flow channel and the first surrounding wall portion has a first outer wall surface. The first impeller is accommodated in the first axial flow channel and the first axial flow channel has a first air outlet end, wherein the first airflow formed by the operation of the first impeller flows out of the first axial flow channel through the first air outlet end. The first side guide structure is protruding from the first end surface connected to the first outer wall surface at the first air outlet end, and the first side guide structure is used to make the first branch of the first airflow at the first end surface flow in a first direction, wherein the first direction and the normal direction of the first outer wall surface form a first acute angle.

[0020] In one embodiment, the first fan frame has a second side guide structure, which is protruded on the second end surface connected to the second outer wall surface at the first air outlet end. The second side guide structure is used to make the second branch of the first airflow at the second end surface flow in a second direction, wherein the second direction and the normal direction of the second outer wall surface form a second acute angle, and the first outer wall surface and the second outer wall surface are respectively different outer wall surfaces of the first surrounding wall portion.

[0021] In one embodiment, the normal directions of the first outer wall surface and the second outer wall surface are different.

[0022] In one embodiment, the first outer wall portion boundary and the second outer wall portion boundary are directly connected and form an angle therebetween.

[0023] In one embodiment, the first end surface portion boundary is directly connected to the second end surface portion boundary.

[0024] In one embodiment, the first impeller includes a plurality of blades, and the plurality of blades have wavy blade surfaces or flat blade surfaces. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram showing an axial flow fan according to an embodiment of the present invention;

[0026] Figure 2A An exploded schematic diagram of an axial flow fan according to an embodiment of the present invention is shown;

[0027] Figure 2BShows another exploded view of the axial flow fan according to an embodiment of the present invention;

[0028] Figure 3 A front view of a fan frame of an axial flow fan according to an embodiment of the present invention is shown;

[0029] Figure 4 A front view showing a fan frame of an axial flow fan according to another embodiment of the present invention;

[0030] Figure 5A A schematic diagram showing an axial flow fan assembly according to an embodiment of the present invention;

[0031] Figure 5B A schematic diagram showing an axial flow fan assembly according to another embodiment of the present invention;

[0032] Figure 6 A schematic diagram showing an axial-flow fan assembly according to another embodiment of the present invention is shown.

[0033]

Explanation of symbols

[0034] 1, 1a, 1b, 1b', 1c, 1d, 1e: Axial-flow fans

[0035] 100, 100', 200: Axial fan combination

[0036] 10: Impeller

[0037] 11: Wheels

[0038] 12: Fan blades

[0039] 20, 20': fan frame

[0040] 21: Surrounding wall

[0041] 211, 212, 213, 214, 211a, 211b, 211b', 211c, 211d, 212d, 211e: end faces

[0042] 22: Base

[0043] 221: Central Department

[0044] 222: Connection

[0045] 23, 23', 23", 23a, 23b, 23b', 23c, 23d1, 23d2, 23e: Side guide structure

[0046] 231, 231', 231a, 231b, 231b': first surface

[0047] 24: Connection structure

[0048] 232: Second surface

[0049] 233: Third Surface

[0050] 234: End

[0051] A: Air inlet

[0052] B: Air outlet

[0053] C: Shaft

[0054] CW: Convergence

[0055] D1, D2, D3, D4, D2', D3', D1a, D2a, D3a, D4a, D1b, D2b, D3b, D4b, D1b', D2b', D3b', D4b' , D1c, D2c, D1d, D2d, D1e, D2e: direction S1, S2, S3, S4, S1a, S1b, S1b', S1c, S1d, S2d, S1e: outer wall surface

[0056] WU, WU', WU": upward airflow

[0057] WD, WD', WD": Downdraft

[0058] θ1, θ1', θ2, θ2', θ2a, θ2b, θ2b': included angle DETAILED DESCRIPTION

[0059] Some typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention is capable of various modifications in different aspects without departing from the scope of the present invention, and the description and drawings are intended to be illustrative in nature and not to limit the present invention.

[0060] See also Figure 1 、 Figures 2A-2B 、 Figure 3 and Figure 4 , Figure 1 A schematic diagram showing an axial flow fan according to an embodiment of the present invention is shown. Figure 2A An exploded schematic diagram of an axial flow fan according to an embodiment of the present invention is shown. Figure 2B Shows another exploded view of the axial flow fan according to an embodiment of the present invention. Figure 3 A front view showing a fan frame of an axial flow fan according to an embodiment of the present invention, and Figure 4A front view of a fan frame of an axial flow fan according to another embodiment of the present invention is shown. The axial flow fan 1 of the present invention comprises an impeller 10 and a fan frame 20, wherein the impeller 10 is accommodated in the fan frame 20. The impeller 10 comprises a hub 11 and a plurality of blades 12, wherein the plurality of blades 12 are arranged on the outer periphery of the hub 11, and the impeller 10 has a rotating shaft C for rotating to form an airflow. Figure 1 、 Figure 2A In the embodiment, the impeller 10 rotates counterclockwise around the rotation axis C. Figure 2B In the embodiment, impeller 10 rotates clockwise about axis C. Blades 12 may have wavy surfaces, flat surfaces, or other suitable blade forms, depending on the actual implementation. Frame 20 includes a surrounding wall 21 and a base 22, which may be integrally formed or separate. Connecting structure 24 is further provided on surrounding wall 21 for connection to a system or other device.

[0061] The surrounding wall portion 21 surrounds the axial flow channel to accommodate the impeller 10. For example, it surrounds a cylindrical axial flow channel to accommodate the impeller 10. The axial flow channel has an air inlet end A and an air outlet end B, and the airflow generated by the operation of the impeller 10 flows out through the air outlet end B. In this embodiment, the surrounding wall portion 21 is implemented as a generally rectangular parallelepiped with rounded corners and has four outer wall surfaces S1, S2, S3, and S4. In this case, the normal direction of outer wall surface S1 is 180 degrees to the normal direction of outer wall surface S2, 90 degrees to the normal direction of outer wall surface S3, and 270 degrees to the normal direction of outer wall surface S4. However, the present invention is not limited to this. The surrounding wall portion 21 can also be implemented as other three-dimensional shapes surrounding the axial flow channel and having a corresponding number of outer wall surfaces. For example, it can be implemented as a pentagonal three-dimensional shape with five outer wall surfaces. In this case, the angle between the normal directions of adjacent outer wall surfaces changes accordingly. Therefore, all are feasible and are not limited by the attached drawings.

[0062] The base 22 is used to position the impeller 10. In this embodiment, the base 22 is located approximately at the outlet end B of the axial fan 1 and includes a central portion 221 and connecting portions 222. The central portion 221 is located at the center of the surrounding wall 21 to accommodate the impeller 10. The connecting portions 222 connect the central portion 221 and the surrounding wall 21 and are arranged in a generally symmetrical pattern. In another embodiment, the base 22 can also be located at the inlet end A of the axial fan, allowing for variations in design depending on the application. In this embodiment, four connecting portions 222 are provided, connecting the central portion 221 to the four inner corners of the rectangular surrounding wall 21, and each connecting portion 222 has a curved shape. However, as is well known in the art, the number, shape, and connection locations of the connecting portions 222 with the surrounding wall 21 can vary depending on the application. For example, the connecting portions can be connected to locations other than the inner corners and / or can be linear, S-shaped, or similar. All do not depart from the scope of this utility model.

[0063] The fan frame 20 further includes a side guide structure 23. The side guide structure 23 is protruded from the air outlet end B, that is, the side guide structure 23 is a protruding structure extending from the surrounding wall portion 21 toward the air outlet direction of the axial flow fan 1. The side guide structure 23 is arranged relative to the outer wall surface of the surrounding wall portion 21. For example, Figure 3 Taking the example of the surrounding wall portion 21 shown as a rectangular parallelepiped having four outer wall surfaces S1, S2, S3, and S4, the side guide structure 23 can be disposed on the end surfaces connected to each outer wall surface at the air outlet end B, namely, the end surface 211 connected to the outer wall surface S1, the end surface 212 connected to the outer wall surface S2, the end surface 213 connected to the outer wall surface S3, and the end surface 214 connected to the outer wall surface S4. In other words, the end surfaces 211, 212, 213, and 214 collectively constitute the installation surface of the surrounding wall portion 21 at the air outlet end B.

[0064] In addition, the number of the side guide structures 23 can be single or multiple, and the location of the side guide structures 23 can be changed according to the actual application requirements. Figure 3 As shown, the two side guide structures 23 and 23' can be implemented as being respectively located on the end surface 211 and the end surface 212 at opposite positions and forming a diagonal relationship between the two side guide structures, that is, the normal directions of the outer wall surfaces S1 and S2 adjacent to the two side guide structures 23 and 23' are opposite to each other; or as shown Figure 4 As shown, it can also be implemented as two side guide structures 23, 23" being respectively located on the directly connected end surface 211 and the end surface 213 and the two being adjacent to each other, that is, the normal directions of the outer wall surfaces S1 and S3 adjacent to the two side guide structures 23, 23" are 90 degrees, and at least part of the boundary of the outer wall surface S1 is directly connected to at least part of the boundary of the outer wall surface S3; or, it can also be implemented as being arranged at other positions, for example, it can be implemented as one side guide structure being arranged on the left side of the end surface 211 and the other side guide structure being arranged on the upper side of the end surface 214, etc. More specifically, when more than one side guide structure is provided on the fan frame 20, the normal directions of the outer wall surfaces adjacent to each side guide structure are different from each other, that is, one outer wall surface will only be adjacent to one side guide structure. In addition, further, when the side guide structures 23, 23" are adjacent to each other, the two can be implemented as being connected via a connecting structure 24 (such as Figure 4 As shown), or it can be implemented as a direct connection (not shown), there is no limitation. Therefore, the setting method can be changed according to actual needs, which is feasible. Figure 3 Side guide structure 23 in the upper left corner Figure 1 、 Figure 2A and Figure 2B For explanation, the side guide structures arranged at other positions have the same structural relationship, which will not be described in detail.

[0065] The side guide structure 23 includes a first surface 231, a second surface 232, a third surface 233, and an end portion 234. The first surface 231 is generally oriented in the direction of the rotation axis C and is generally perpendicular to the end surface 211. That is, the first surface 231 and the rotation axis C are generally parallel to and opposite to each other, and an acute angle θ1 is formed between the first surface 231 and the outer wall surface S1. The second surface 232 is generally perpendicular to the end surface 211 and is located closer to the outer wall surface S1 than the first surface 231. It intersects with the first surface 231 at the end portion 234. In a preferred embodiment, the second surface 232 is at least partially coplanar with the outer wall surface S1, but the present invention is not limited thereto. The second surface 232 may also be recessed to have a step difference with the outer wall surface S1. The third surface 233 intersects with the first surface 231 and the second surface 232 and is opposite to the end surface 211. More specifically, the side guide structure 23 is generally a protruding structure located on the end surface 211 and enclosed by a first surface 231, a second surface 232, and a third surface 233. The side guide structure 23 extends from the inner corner formed by the outer wall surface S1 and the outer wall surface S3 along the outer wall surface S1 in a direction away from the inner corner. In other words, the side guide structure 23 is disposed at opposite ends of the end surface 211. In some embodiments, the side guide structure 23 and the surrounding wall portion 21 are integrally formed, or the side guide structure 23 and the connecting structure 24 are integrally formed, or the side guide structure 23, the connecting structure 24, and the surrounding wall portion 21 are integrally formed. In some embodiments, the side guide structure 23 and the connecting portion 222 are connected together, or the side guide structure 23 and the connecting portion 222 are separate structures. These variations may vary depending on actual implementation circumstances and remain within the scope of the present invention.

[0066] Generally speaking, when an axial flow fan without a side guide structure is in operation, the air flow at the air outlet is discharged in four mutually perpendicular directions, that is, Figure 3 The diversion is discharged roughly in four directions: up, down, left, and right. In the present invention, by setting a side guide structure, such as Figure 3 As shown, side guide structures 23 and 23' are provided at the upper left corner and the lower right corner, so that the upward and downward diversions originally perpendicular to the outer wall surfaces S1 and S2 are changed in direction by the side guide structures 23 and 23', and are directed toward directions D1 and D2 that respectively have acute angles θ2 and θ2' with the normal direction of the outer wall surfaces S1 and S2; on the other hand, since no side guide structures are provided in the air outlet directions on the left and right sides, that is, no side guide structures are provided adjacent to the end surfaces 213 and 214 connected to the outer wall surfaces S3 and S4, the leftward and rightward diversions will maintain the original discharge direction, that is, the directions D3 and D4 perpendicular to the outer wall surfaces S3 and S4. Alternatively, as shown in FIG. Figure 4As shown, the fan frame 20' is provided with a side guide structure 23 on the end face 211 connected to the outer wall surface S1 and a side guide structure 23" is provided on the end face 213 connected to the outer wall surface S3, and the side guide structures 23 and 23" are both located in the upper left corner and adjacent to each other, so that the upward diversion and leftward diversion originally perpendicular to the outer wall surfaces S1 and S3 are affected by the side guide structures 23 and 23" and change direction to the direction D1 and the direction D3'; on the other hand, since no side guide structure is provided in the diversion direction on the right and lower sides, that is, no side guide structure is provided adjacent to the end face 212 and the end face 214 connected to the outer wall surfaces S2 and S4, the diversion discharged downward and to the right will maintain the original discharge direction, that is, the directions D2' and D4 perpendicular to the outer wall surfaces S2 and S4.

[0067] Specifically, in the present invention, the first surface 231 of the side guide structure 23 is used as a windward surface to change the wind direction of the diversion toward the adjacent outer wall surface S1, so that the wind direction is turned to be roughly parallel to the windward surface and away from the windward surface. In addition, the acute angle θ1 between the first surface 231 and the outer wall surface S1 can be used to control the amount of airflow affected by the windward surface (first surface 231), and determine the acute angle θ2 between the final wind direction (diversion direction D1) and the normal direction of the outer wall surface S1, thereby achieving the effect of controlling and changing the wind direction to the desired direction. For example, when the angle θ1 is larger, the angle θ2 is smaller, and the two are negatively correlated. In this way, the effect of changing the diversion direction toward any outer wall surface of the axial flow fan can be achieved by providing a side guide structure adjacent to the outer wall surface of the axial flow fan.

[0068] For example, in some usage situations, the axial flow fan may be set up with one side close to an object. In this case, if the side guide structure is not set up, the air outlet toward the one side will directly go toward the object and be blocked by the object, resulting in an airflow that conflicts with the air outlet direction, which is likely to cause airflow turbulence, generate noise, and affect the performance of the axial flow fan. In this case, if the side guide structure can be set up on the one side, for example, Figure 3 By placing the axial fan so that the outer wall S1 in the middle and upper part is close to the object, the diversion airflow direction originally directed toward the object can be changed to the direction D1, which can reduce the turbulence generated at the junction of the object and the axial fan, effectively reduce noise and improve the efficiency of the axial fan. In other usage conditions, the axial fan may be placed in a corner, for example, at the angle formed by two walls. In this case, Figure 4The outer wall surfaces S1 and S3 are close to the two walls, so that the air outlet direction originally directly toward the wall is changed to the direction D1 and D3', which will reduce the turbulence generated at the junction of the wall and the axial fan, effectively reduce noise and improve the efficiency of the axial fan. In addition, the diversion direction D1 and / or D3 can be further determined according to the distance between the outer wall surface and the object / wall surface. For example, when the distance between the outer wall surface S1 and the object is closer, the angle θ2 between the direction D1 and the normal direction of the outer wall surface S1 should be larger, and the two are negatively correlated, so as to reduce the conflict between the air outlet and the object. In other usage conditions, the occasion where an axial fan is set up may require airflow in a specific direction to concentrate heat dissipation, and the air outlet can also be directed to the required direction by setting a side guide structure, for example, Figure 3 The case where both the upper and lower outer walls are provided with side guide structures is suitable for the need to increase the heat dissipation demand of the left and right directions, and Figure 4 The situation shown in FIG. 1 where both the upper and left outer walls are provided with side guide structures is suitable for heat dissipation needs that require increased air flow toward the right and downward directions.

[0069] Therefore, through the side guide structure 23 protruding from the air outlet end of the present invention, the lateral diversion direction of the axial flow fan can be changed through the windward surface (first surface 231) to adapt to the different air outlet direction requirements of various settings. At the same time, it can also advantageously reduce turbulence and noise and improve the performance of the axial flow fan.

[0070] Furthermore, the side guide structure according to the present invention can also help reduce the turbulence between adjacent axial flow fans that affects the performance of the axial flow fan assembly when the axial flow fan assembly is used together. Figure 5A , which shows a schematic diagram of an axial flow fan assembly according to an embodiment of the present invention. In this embodiment, the axial flow fan assembly 100 includes axial flow fans 1a and 1b arranged adjacent to each other, wherein the outer wall surfaces S1a and S1b of the axial flow fans 1a and 1b face each other, respectively. Figure 5A As shown, they are adjacent to each other in a side-by-side manner. The side guide structure 23a is provided on the end surface 211a connected to the outer wall surface S1a, and the side guide structure 23b is provided on the end surface 211b connected to the outer wall surface S1b, and the side guide structures 23a and 23b are located at opposite ends of the adjacent outer wall surfaces S1a and S1b, that is, as shown in FIG. Figure 5AAs shown, the side guide structure 23a is located at the upper end of the outer wall surface S1a, and the side guide structure 23b is located at the lower end of the outer wall surface S1b. In this configuration, since both axial flow fans 1a and 1b rotate counterclockwise, the side guide structure 23a is located at the upper right corner of the axial flow fan 1a. The diverted flow toward the outer wall surface S1a will be affected by the windward first surface 231a and redirected toward the lower right diverted flow direction D1a. On the other hand, the side guide structure 23b is located at the lower left corner of the axial flow fan 1b. The diverted flow toward the outer wall surface S1b will be affected by the windward first surface 231b and redirected toward the upper left diverted flow direction D1b. In this way, the airflow directions at the junction of the two axial fans, which were originally opposite to each other, can be changed to airflows in opposite directions. This is achieved by simply properly controlling the distance between the outer wall S1a of the axial fan 1a and the outer wall S1b of the axial fan 1b. For example, the distance between the outer walls S1a and S1b should be negatively correlated with the angles θ2a and θ2b. This allows the airflows in directions D1a and D1b to be staggered, effectively reducing the occurrence of turbulence between the axial fans, lowering noise, and improving the efficiency of the axial fan assembly.

[0071] Furthermore, the airflow from axial fan 1a in the three directions other than the outer wall S1a is not affected by the side guide structure and maintains the diversion directions D2a, D3a, and D4a perpendicular to the outer wall. Similarly, the airflow from axial fan 1b in the three directions other than the outer wall S1b is also not affected by the side guide structure and maintains the diversion directions D2b, D3b, and D4b perpendicular to the outer wall. Therefore, axial fan assembly 100 can provide an upward airflow WU that combines diversion directions D3a, D1b, and D4b, and a downward airflow WD that combines diversion directions D4a, D1a, and D3b, while minimizing turbulence between axial fan 1a and axial fan 1b.

[0072] Figure 5B A schematic diagram of an axial flow fan assembly according to another embodiment of the present invention is shown. In this embodiment, the axial flow fan assembly 100' comprises adjacently arranged axial flow fans 1a and 1b', wherein the axial flow fans 1a and 1b' respectively have outer wall surfaces S1a and outer wall surfaces S1b' facing each other, i.e. Figure 5B As shown, they are adjacent to each other in a side-by-side manner. The side guide structure 23a is provided on the end surface 211a connected to the outer wall surface S1a, and the side guide structure 23b' is provided on the end surface 211b' connected to the outer wall surface S1b', and the side guide structures 23a and 23b' are located at the same end of the adjacent outer wall surfaces S1a and S1b', that is, as shown in FIG. Figure 5BAs shown, the side guide structure 23a is located at the upper end of the outer wall surface S1a, and the side guide structure 23b' is located at the upper end of the outer wall surface S1b. In this configuration, since both axial-flow fans 1a and 1b' rotate counterclockwise, the side guide structure 23a is located at the upper right corner of the axial-flow fan 1a. The diverted flow toward the outer wall surface S1a will be influenced by the windward first surface 231a and redirected toward the lower right diverted flow direction D1a. On the other hand, the side guide structure 23b' is located at the upper left corner of the axial-flow fan 1b'. The diverted flow toward the outer wall surface S1b' will be influenced by the windward first surface 231b' and redirected toward the lower left diverted flow direction D1b'. In this way, the airflow directions originally facing each other at the junction of the two axial fans can be changed to be both directed generally downward, forming a converging flow CW, oriented in a downward converging direction. Furthermore, by simply properly controlling the distance between the outer wall surface S1a of the axial fan 1a and the outer wall surface S1b' of the axial fan 1b'—for example, the distance between the outer wall surfaces S1a and S1b' should be negatively correlated with the included angles θ2a and θ2b'—the generation of turbulence between the axial fans can be effectively reduced, noise can be lowered, and the efficiency of the axial fan assembly can be improved.

[0073] Furthermore, the airflow from axial fan 1a in the three directions other than the outer wall S1a is unaffected by the side guide structure and maintains the airflow directions D2a, D3a, and D4a perpendicular to the outer wall. Similarly, the airflow from axial fan 1b' in the three directions other than the outer wall S1b' is also unaffected by the side guide structure and maintains the airflow directions D2b', D3b', and D4b' perpendicular to the outer wall. Therefore, axial fan assembly 100' can provide an upward airflow WU', which combines the airflow from the directions D3a and D4b', and a downward airflow WD', which combines the airflow from the directions D4a and D3b' and merges them CW. Turbulence between axial fan 1a and axial fan 1b is minimized.

[0074] In other words, when the axial-flow fans in an axial-flow fan assembly are arranged side by side, it is only necessary to respectively provide side guide structures on two adjacent outer wall surfaces between the adjacent axial-flow fans. This can effectively guide the airflows toward the adjacent outer wall surfaces to stagger in opposite directions or merge in approximately the same direction, thereby reducing turbulence and achieving the effect of airflow on all sides of the axial-flow fan assembly.

[0075] Figure 6A schematic diagram of an axial flow fan assembly according to another embodiment of the present invention is shown. In this embodiment, the axial flow fan assembly 200 includes axial flow fans 1c, 1d, and 1e, each of which rotates counterclockwise. The side guide structure 23c of the axial flow fan 1c is provided on the end surface 211c connected to the outer wall surface S1c facing the axial flow fan 1d, the side guide structure 23d1 of the axial flow fan 1d is provided on the end surface 211d connected to the outer wall surface S1d facing the axial flow fan 1c, and the side guide structure 23d2 is provided on the end surface 212d connected to the outer wall surface S2d facing the axial flow fan 1e, and the side guide structure 23e of the axial flow fan 1e is provided on the end surface 211e connected to the outer wall surface S1e facing the axial flow fan 1d, and the side guide structure 23c and the side guide structure 23d1 are respectively located at opposite ends of the adjacent outer wall surface S1c and the outer wall surface S1d, the side guide structure 23d1 and the side guide structure 23d2 are provided at diagonal positions of the axial flow fan 1d, and the side guide structure 23d2 and the side guide structure 23e are respectively located at opposite ends of the adjacent outer wall surface S2d and the outer wall surface S1e. In this configuration, axial fans 1c and 1d can generate airflows in opposite and staggered directions, oriented in directions D1c and D1d, respectively. Furthermore, axial fans 1d and 1e can generate airflows in opposite and staggered directions, oriented in directions D2d and D1e, respectively. Consequently, axial fan assembly 200 can provide a comprehensive upward airflow WU" and a comprehensive downward airflow WD", with the leftward flow primarily diverted by axial fan 1c in direction D2c, and the rightward flow primarily diverted by axial fan 1e in direction D2e. Turbulence between axial fans 1c and 1d, and between axial fans 1d and 1e, is minimized, achieving the effect of airflow on all four sides of the axial fan assembly.

[0076] Of course, you can also Figure 5B The side guide structure is set in the manner shown, that is, the side guide structure is set at the same end of the adjacent outer wall surfaces of the side-by-side axial flow fans so that the airflow between the adjacent axial flow fans turns in approximately the same direction and merges. Its structure and airflow are roughly as described above and will not be repeated.

[0077] In addition to being arranged adjacently in a single direction, when the axial-flow fans in the axial-flow fan assembly are arranged in a matrix, side guide structures can also be provided at the end surfaces connected to the adjacent outer walls of the parallel axial-flow fans to achieve the effect of staggering or merging the airflows, thereby reducing turbulence and noise. The arrangement of the side guide structures is similar to that described above and will not be repeated here.

[0078] In summary, the present invention employs side guide structures at the outlet ends of axial fans, adjacent to the outer wall of the axial fan's surrounding wall. This changes the direction of airflow, which was originally perpendicular to the outer wall, to one that forms an acute angle with the normal to the outer wall. This facilitates increasing airflow in specific directions and enhancing axial fan efficiency. Furthermore, in an axial fan assembly, axial fans arranged side by side can be configured with side guide structures on each end face connected to two adjacent outer walls, changing the previously opposing airflow directions to staggered or merged, effectively reducing turbulence and noise between adjacent axial fans and thereby improving the efficiency of the axial fan assembly.

[0079] It should be noted that the above are merely preferred embodiments for the purpose of illustrating the present invention. The present invention is not limited to the embodiments described. The scope of the present invention is determined by the claims. Furthermore, the present invention may be modified in various ways by those skilled in the art without departing from the scope of the claims.

Claims

1. An axial flow fan assembly, characterized in that: Include: a first axial-flow fan; and a second axial flow fan disposed side by side with the first axial flow fan, wherein the second axial flow fan comprises: a first impeller having a first rotating shaft; and A first fan frame, for accommodating the first impeller, comprising: a first surrounding wall portion, surrounding a first axial flow channel and having a first outer wall surface facing the first axial flow fan; the first impeller is accommodated in the first axial flow channel, and the first axial flow channel has a first air outlet end, wherein a first airflow generated by the operation of the first impeller flows out of the first axial flow channel through the first air outlet end; and A first side guide structure is protrudingly provided on a first end surface connected to the first outer wall surface at the first air outlet end. The first side guide structure is used to make a first branch of the first airflow at the first end surface flow in a first direction, wherein the first direction forms a first acute angle with the normal direction of the first outer wall surface.

2. The axial flow fan assembly according to claim 1, wherein: The first axial flow fan comprises: a second impeller having a second rotating shaft; and A second fan frame, comprising: a second surrounding wall portion, surrounding a second axial flow channel and having a second outer wall surface facing the second axial flow fan, the second impeller being accommodated in the second axial flow channel and the second axial flow channel having a second air outlet end, wherein a second airflow generated by the operation of the second impeller flows out of the second axial flow channel through the second air outlet end; and A second side guide structure is protrudingly provided on a second end surface connected to the second outer wall surface at the second air outlet end. The second side guide structure is used to make a second branch of the second airflow at the second end surface flow in a second direction, wherein the second direction forms a second acute angle with the normal direction of the second outer wall surface.

3. The axial flow fan assembly according to claim 2, wherein: The first direction and the second direction are opposite to each other and staggered.

4. The axial flow fan assembly according to claim 2, wherein: The first branch flow merges with the second branch flow and flows toward a first merging direction.

5. The axial flow fan assembly according to claim 1, wherein: It also includes: a third axial-flow fan disposed side by side with the second axial-flow fan near a third outer wall surface of the first surrounding wall portion, wherein the third outer wall surface faces the third axial-flow fan; and A third side guide structure is protrudingly provided on a third end surface connected to the third outer wall surface at the first air outlet end. The third side guide structure is used to make a third branch of the first airflow at the third end surface flow in a third direction, wherein the third direction forms a third acute angle with the normal direction of the third outer wall surface.

6. The axial flow fan assembly according to claim 5, wherein: The third axial flow fan comprises: a third impeller having a third rotating shaft; and A third fan frame, comprising: a third surrounding wall portion, surrounding a third axial flow channel and having a fourth outer wall surface facing the second axial flow fan, the third impeller being accommodated in the third axial flow channel and the third axial flow channel having a third air outlet end, wherein a fourth airflow generated by the operation of the third impeller flows out of the third axial flow channel through the third air outlet end; and A fourth side guide structure is protrudingly provided on a fourth end surface connected to the fourth outer wall surface at the third air outlet end. The fourth side guide structure is used to make a fourth branch of the fourth airflow at the fourth end surface flow in a fourth direction, wherein the fourth direction forms a fourth acute angle with the normal direction of the fourth outer wall surface.

7. The axial flow fan assembly according to claim 6, wherein: The third direction and the fourth direction are opposite to each other and staggered with each other.

8. The axial flow fan assembly according to claim 6, wherein: The third branch flow merges with the fourth branch flow and flows toward a second merging direction.

9. The axial flow fan assembly according to claim 5, wherein: The first side guide structure is directly connected to the third side guide structure.

10. The axial flow fan assembly according to claim 5, wherein: The first side guide structure and the third side guide structure are connected via a first connecting structure.

11. The axial flow fan assembly according to claim 1, wherein: The distance between the first axial flow fan and the first outer wall is negatively correlated with the first acute angle.

12. The axial flow fan assembly according to claim 1, wherein: The first impeller includes a plurality of blades, and the plurality of blades have wave blade surfaces or flat blade surfaces.

13. An axial flow fan, characterized in that: Include: a first impeller having a first rotating shaft; and A first fan frame, for accommodating the first impeller, comprising: a first surrounding wall portion, surrounding a first axial flow channel and having a first outer wall surface; the first impeller is accommodated in the first axial flow channel, and the first axial flow channel has a first air outlet end, wherein a first airflow generated by the operation of the first impeller flows out of the first axial flow channel through the first air outlet end; and A first side guide structure is protrudingly provided on a first end surface connected to the first outer wall surface at the first air outlet end. The first side guide structure is used to make a first branch of the first airflow at the first end surface flow in a first direction, wherein the first direction forms a first acute angle with the normal direction of the first outer wall surface.

14. The axial flow fan according to claim 13, wherein: The first fan frame has a second side guide structure, which is protruding from a second end surface connected to a second outer wall surface at the first air outlet end. The second side guide structure is used to make a second branch of the first airflow at the second end surface flow in a second direction, wherein the second direction and the normal direction of the second outer wall surface form a second acute angle, and the first outer wall surface and the second outer wall surface are respectively different outer wall surfaces of the first surrounding wall portion.

15. The axial flow fan according to claim 14, wherein: The normal directions of the first outer wall surface and the second outer wall surface are different.

16. The axial flow fan according to claim 14, wherein: The first outer wall portion boundary is directly connected to the second outer wall portion boundary and forms an angle therebetween.

17. The axial flow fan according to claim 14, wherein: The first end surface portion boundary is directly connected to the second end surface portion boundary.

18. The axial flow fan according to claim 13, wherein: The first impeller includes a plurality of blades, and the plurality of blades have wave blade surfaces or flat blade surfaces.

Images