Fan impeller and energy storage heat management unit

Abstract

The utility model belongs to the technical field of fans, and discloses a fan impeller and an energy storage heat management unit. The fan impeller comprises a hub, fan blades and a rim; the fan blades are connected with the hub, and the multiple fan blades are arranged in the circumferential direction of the hub at intervals; the rim is arranged around the hub and connected with the ends, away from the hub, of the fan blades. Wherein the fan blades are obliquely arranged, and the inclination angles of the fan blades are gradually reduced from the hub to the rim in the radial direction of the hub. By optimizing the inclination angles of the fan blades, the aerodynamic efficiency of the fan is improved, and noise generated by the fan is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to fan technical field especially, and it is a kind of fan impeller and energy storage thermal management unit. BACKGROUND

[0002] The current compact axial fan on market, its impeller is mainly for the development of vehicle occasion, if compact axial fan is used in energy storage thermal management unit, usually only this kind of vehicle fan can be purchased.In vehicle occasion, the air flow of fan is higher, and the high air side pressure head of fan impeller is 300-400Pa, but for the thermal management unit of energy storage equipment, it does not need so high air flow, and the air side pressure head is relatively low, only 100-200Pa.This leads to the compact axial fan developed for vehicle occasion to form energy storage thermal management unit, due to the reduction of pressure head, the aerodynamic efficiency of fan is also affected, and the air volume of fan is influenced. SUMMARY

[0003] The utility model discloses a kind of fan impellers, improve aerodynamic efficiency and reduce the noise generated by fan under the premise that air volume and pressure head curve keep almost unchanged.

[0004] To achieve this purpose, the utility model adopts the following technical scheme: a fan impeller, comprising a hub, a fan blade and a rim;The fan blade is connected with the hub, and a plurality of fan blades are arranged along the circumference of the hub;The rim is arranged around the hub and connected with the end of the fan blade away from the hub;Wherein, the fan blade has a rotation plane perpendicular to the hub axis, the fan blade is inclined to the rotation plane, and the inclination angle of the fan blade gradually decreases from the hub to the rim along the radial direction of the hub.

[0005] Preferably, the reduction rate of the inclination angle of the fan blade at the hub is greater than the reduction rate of the inclination angle of the fan blade at the rim.

[0006] Preferably, the inclination angle of the fan blade is θ, and satisfies: 15°≤θ≤25°.

[0007] Preferably, the reduction rate of the inclination angle of the fan blade at the hub is V1, which is greater than the reduction rate of the inclination angle of the fan blade at the rim V2, and satisfies: 0≤V1≤0.45, 0≤V2≤0.45.

[0008] Preferably, the pattern of the fan blade on the cylindrical section concentric with the hub axis is airfoil-shaped.

[0009] Preferably, the fan blade has a leading edge and a trailing edge arranged in the rotation direction of the fan blade, and the projections of the leading edge and the trailing edge in the rotation plane are respectively streamline-shaped.

[0010] As preferred, on the rotation plane, a circumferential included angle between the leading edge and the center of the hub forms a first wrap angle, and a circumferential included angle between the trailing edge and the center of the hub forms a second wrap angle, the second wrap angle being greater than the first wrap angle.

[0011] As preferred, the rim is provided with a peripheral portion, the peripheral portion is arranged around the rim, and an outer edge of the peripheral portion is folded back axially towards the rear of the hub to form a secondary vortex prevention ring.

[0012] As preferred, along the circumferential direction of the hub, an included angle between at least some adjacent vanes of the plurality of vanes is different from an included angle between the rest of the adjacent vanes.

[0013] Another object of the present application is to provide an energy storage thermal management unit, which improves aerodynamic efficiency and reduces noise generated by the fan under the premise that the air volume and pressure head curve remain almost unchanged.

[0014] To achieve the above object, the present application adopts the following technical scheme: an energy storage thermal management unit, comprising a plurality of fans, wherein each fan comprises a shell and the fan impeller as described above, and the fan impeller and the shell are rotationally connected.

[0015] The present application has the following beneficial effects: the air volume of the axial flow fan is directly proportional to the cube of the diameter of the vane, the linear speed of the vane at the connection with the rim is the largest, the work done by the vane on the air is the highest, and the aerodynamic noise of the fan at this position is also the largest; the linear speed of the vane at the connection with the hub is the smallest, the work done by the vane on the air is the lowest, and the aerodynamic noise of the fan at this position is also the smallest. By gradually reducing the inclination angle of the vane along the radial direction of the hub from the hub to the direction of the rim, the work done by the vane is enhanced and the air volume is increased at the hub through a larger vane inclination angle, and the work done by the vane is weakened and the noise is reduced at the rim through a smaller vane inclination angle; the aerodynamic efficiency of the fan is improved and the noise generated by the fan is reduced under the premise that the air volume and pressure head curve remain almost unchanged. In addition, the change of the vane inclination angle is linear to adapt to the linear air flow, which can avoid vortex or air flow separation on the surface of the vane to cause air volume loss.

[0016] The present application also provides an energy storage thermal management unit, which improves aerodynamic efficiency and reduces noise generated by the fan by optimizing the inclination angle of the vane. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a schematic view of the mechanism of the fan impeller of the present application;

[0018] Figure 2 is a sectional view of the vane of the present application;

[0019] Figure 3 is the inclination angle change diagram of the small diameter section of the fan blade of the utility model;

[0020] Figure 4 is the inclination angle change diagram of the middle diameter section of the fan blade of the utility model;

[0021] Figure 5 is the inclination angle change diagram of the large diameter section of the fan blade of the utility model;

[0022] Figure 6 is the sectional view of the fan impeller of the utility model;

[0023] Figure 7 is the noise comparison diagram of the fan impeller of the utility model and the existing fan impeller;

[0024] Figure 8 is the air volume test diagram of the existing fan impeller;

[0025] Figure 9 is the air volume test diagram of the fan impeller of the utility model;

[0026] Figure 10 is Figure 7 and Figure 8 the integrated air volume comparison diagram;

[0027] Figure 11 is the static pressure efficiency test diagram of the existing fan impeller;

[0028] Figure 12 is the static pressure efficiency test diagram of the fan impeller of the utility model;

[0029] Figure 13 is Figure 11 and Figure 12 the integrated static pressure efficiency comparison diagram;

[0030] Figure 14 is Figure 11 and Figure 12 the integrated input efficiency comparison diagram.

[0031] In the figure: 100, hub; 200, fan blade; 210, chord line; 220, small diameter section; 230, middle diameter section; 240, large diameter section; 250, leading edge; 260, trailing edge; 300, rim; 310, peripheral portion; 311, secondary vortex prevention ring. DETAILED DESCRIPTION

[0032] The utility model will be further explained in detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model, and not to limit the utility model. In addition, it should be noted that, in order to facilitate the description, only the part related to the utility model is shown in the drawings, not all structures.

[0033] In the description of the utility model, unless another definite provision and limitation, the term "link", "connect", "fix" should be broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements inside the communication or two elements of the interaction relationship.For the ordinary skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.

[0034] In the utility model, unless another definite provision and limitation, the first feature is "on" or "under" the second feature can include the first and second features direct contact, also can include the first and second features is not direct contact but is through the contact between other features of them.And, the first feature is "on", "above" and "on" the second feature includes the first feature is directly above and obliquely above the second feature, or just indicates that the horizontal height of the first feature is higher than the second feature.The first feature is "under", "below" and "under" the second feature includes the first feature is directly below and obliquely below the second feature, or just indicates that the horizontal height of the first feature is less than the second feature.

[0035] In the description of the embodiment, the terms "up", "down", "right", etc. Orientation or position relationship is based on the orientation or position relationship shown in the drawing, only for the convenience of description and simplification operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the utility model.In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0036] Referring to Figures 1 to 5 As shown in the utility model embodiment provides a fan impeller, including hub 100, fan blade 200 and rim 300;Fan blade 200 is bent and twisted arc, fan blade 200 is connected with hub 100, fan blade 200 is spaced apart along the circumference of hub 100 multiple;Rim 300 is annular, rim 300 is arranged around hub 100 and is connected with the end of fan blade 200 away from hub 100.

[0037] The fan wheel has a rotation plane perpendicular to the axis of the hub 100, and the fan blades 200 are arranged obliquely relative to the rotation plane. The pattern of the fan blades 200 on a cylindrical section concentric with the axis of the hub 100 (in this embodiment, since the cross section of the fan blades 200 is on a cylindrical section, the cross section pattern described here and hereafter is the planar pattern of the fan blades 200 after the cylindrical section plane is unfolded, which is particularly stated here to avoid misunderstanding) has a chord line 210. Due to the oblique arrangement of the fan blades 200, the chord line 210 is also oblique relative to the rotation plane. The inclination angle of the fan blades 200 (i.e. the angle between the chord line 210 and the rotation plane of the fan blades 200) gradually decreases along the radial direction of the hub 100 from the hub 100 to the rim 300.

[0038] It can be understood that the air volume of the axial flow fan is proportional to the cube of the diameter of the fan blades 200, and the diameter of the fan blades 200 is larger near the rim 300 and smaller near the hub 100. Therefore, the linear speed of the fan blades 200 is the largest at the connection between the fan blades 200 and the rim 300, the work done by the fan blades 200 on the air is the highest, and the aerodynamic noise of the fan is the largest at this position. The linear speed of the fan blades 200 is the smallest at the connection between the fan blades 200 and the hub 100, the work done by the fan blades 200 on the air is the lowest, and the aerodynamic noise of the fan is the smallest at this position.

[0039] The inclination angle of the fan blades 200 is gradually decreased along the radial direction of the hub 100 from the hub 100 to the rim 300, so that the fan blades 200 at the hub 100 have a larger inclination angle, so that the rotation angle of the airflow passing through the fan blades 200 at the hub 100 is increased, thereby increasing the flow rate and throughput of the airflow, and further enhancing the work done by the fan blades 200 and increasing the air volume. The fan blades 200 at the rim 300 have a smaller inclination angle, so that the rotation angle of the airflow passing through the fan blades 200 at the rim 300 is reduced, thereby reducing the flow rate and throughput of the airflow, and further reducing the noise of the fan blades 200 at the rim 300. Moreover, the connection between the rim 300 and the fan blades 200 can avoid vortexes at the end of the fan blades 200 away from the hub 100, further reducing the noise. Under the premise that the air volume and pressure head curve of the fan remain almost unchanged, the aerodynamic efficiency of the fan is improved and the noise generated by the fan is reduced. In addition, the change of the inclination angle of the fan blades 200 is linear to adapt to the linear flow of the air, which can avoid vortexes on the surface of the fan blades 200 or the loss of air volume caused by the airflow separating from the fan blades 200.

[0040] Further, the inclination angle of the fan blades 200 (i.e. the angle between the chord line 210 and the rotation plane of the fan blades 200 on any cylindrical section concentric with the hub 100) is θ, which satisfies 15°≤θ≤25°.

[0041] The inclination angle of the fan blade 200 is limited to be greater than 15° to avoid the problem that the fan blade 200 has insufficient work on the airflow, and the fan cannot meet the air volume requirement. The inclination angle of the fan blade 200 is limited to be less than 25° to avoid the problem that the airflow is disturbed and the fan vibration is intensified due to the large angle of the fan blade 200. By reasonably limiting the inclination angle of the fan blade 200, the air volume of the fan can be ensured, and the working stability of the fan can be improved.

[0042] Referring to Figure 2 As shown in FIG. 2, it can be understood that the pattern of the fan blade 200 on the cylindrical section concentric with the axis of the hub 100 is in the shape of an airfoil. Optionally, the fan blade 200 can be set as a wing profile conforming to the standard of the National Advisory Committee for Aeronautics (NACA Foil), which facilitates the scanning modeling of the fan blade 200 and reduces the design cost of the fan blade 200.

[0043] The cross section of the fan blade 200 is set as an airfoil type conforming to aerodynamics, so that the friction of the airflow flowing through the surface of the fan blade 200 is reduced, the probability of vortex flow on the surface of the fan blade 200 is significantly reduced, the size range of the vortex flow is reduced, and the working noise of the fan blade 200 is reduced.

[0044] Referring to Figure 1 As shown in FIG. 2, it can be understood that the reduction speed of the inclination angle of the fan blade 200 at the hub 100 is greater than the reduction speed of the inclination angle of the fan blade 200 at the rim 300. Specifically, along the radial direction of the hub 100 from the hub 100 to the rim 300, the fan blade 200 can be divided into at least a small-diameter section 220 and a large-diameter section 240. In other words, the part of the fan blade 200 close to the hub 100 is the small-diameter section 220, and the part of the fan blade 200 close to the rim 300 is the large-diameter section 240.

[0045] The reduction speed of the angle between the chord line 210 of the small-diameter section 220 and the rotation plane (i.e., the decreasing speed of the inclination angle of the small-diameter section 220) is greater than the reduction speed of the angle between the chord line 210 of the large-diameter section 240 and the rotation plane (i.e., the decreasing speed of the inclination angle of the large-diameter section 240).

[0046] The inclination angle of the fan blade 200 along the radial direction of the hub 100 from the small-diameter section 220 to the middle part of the fan blade 200 decreases rapidly, which ensures the air volume and reduces the working noise of the small-diameter section 220. The inclination angle of the fan blade 200 along the radial direction of the hub 100 from the middle part to the large-diameter section 240 decreases slowly, which ensures the quiet operation, improves the aerodynamic efficiency, and reduces the air volume loss. In addition, the fan blade 200 has different inclination angle change rates, which can avoid the problem that the overall inclination angle change range of the fan blade 200 is small and the working noise is large when the inclination angle reduction rate is small, or avoid the problem that the overall inclination angle change range of the fan blade 200 is large and it is difficult to ensure the air volume of the fan when the inclination angle reduction rate is large.

[0047] In some embodiments, a middle diameter section 230 can be further arranged between the large diameter section 240 and the small diameter section 220. In this case, the decreasing rate of the inclination angle of the small diameter section 220, the decreasing rate of the inclination angle of the middle diameter section 230, and the decreasing rate of the inclination angle of the large diameter section 240 decrease in turn along the radial direction of the hub 100 from the hub 100 to the rim 300. The middle diameter section 230 can be one or more, and the decreasing rate of the inclination angle of the middle diameter section 230 also decreases in turn along the radial direction of the hub 100 from the hub 100 to the rim 300.

[0048] By arranging the middle diameter section 230, the richness of the change of the inclination angle of the fan blade 200 can be further improved, the inclined fan blade 200 can keep balance between ensuring air volume and reducing noise, and the structural rationality of the fan blade 200 can be effectively improved.

[0049] Referring to Figures 3 to 5 It can be understood that the decreasing rate of the inclination angle of the fan blade 200 at the hub 100, i.e. the decreasing rate of the angle between the chord line 210 of the small diameter section 220 and the rotation plane, is V1, the decreasing rate of the inclination angle of the fan blade 200 at the rim 300, i.e. the decreasing rate of the angle between the chord line 210 of the large diameter section 240 and the rotation plane, is V2, and V1 and V2 satisfy 0.0≤V1≤0.45 and 0.0≤V2≤0.45. In addition, when the middle diameter section 230 is arranged between the large diameter section 240 and the small diameter section 220, the decreasing rate of the angle between the chord line 210 of the middle diameter section 230 and the rotation plane is V3, and V2≤V3≤V1 is satisfied.

[0050] It should be noted that the inclination angle of the fan blade 200 is small, and therefore the decreasing rate of the inclination angle of the fan blade 200 is also small, so as to avoid that the bending and twisting amplitude of the fan blade is too large to affect the aerodynamic efficiency. Optionally, the decreasing rate of the inclination angle of the fan blade 200 is usually between 0.45° / mm and 0° / mm (including 0.45° / mm and 0° / mm), i.e. along the radial direction of the hub 100 from the hub 100 to the rim 300, the inclination angle of the fan blade 200 decreases by 0°-0.45° when the fan blade 200 extends by 1 mm. For example, the inclination angle of the fan blade 200 can decrease at a rate of 0.4° / mm in the small diameter section 220, at a rate of 0.25° / mm in the middle diameter section 230, and at a rate of 0.15° / mm in the large diameter section 240.

[0051] Referring to Figure 1 and Figure 6As shown, it can be understood that the fan blade 200 has a leading edge 250 and a trailing edge 260 arranged along the rotation direction of the fan blade 200, and the chord length is the line connecting the endpoints of the figure on the cylindrical section coaxial with the hub 100, specifically, the leading edge 250 is the inner curved leading edge that first contacts the airflow to cut the airflow, and the trailing edge 260 is the edge when the fan blade 200 separates from the airflow, and the projections of the side edges of the leading edge 250 and the trailing edge 260 in the rotation plane (i.e., the projections of the two sides of the fan in the rotation plane) are respectively streamline-shaped, wherein, since the leading edge 250 is an inner curved leading edge, the side edge of the leading edge 250 is concave streamline-shaped, and the trailing edge 260 is the back surface of the inner curved leading edge, and the side edge of the trailing edge 260 is convex streamline-shaped.

[0052] Since the vehicle scene pursues air volume and has no special requirement for noise, the existing compact fan developed for the vehicle scene mostly uses a right-angle shape for the fan blade 200, and the profile is relatively conspicuous, although the air volume is large, but the noise is large. By setting the side edges of the leading edge 250 and the trailing edge 260 to be streamline-shaped, the airflow is smoothly contacted with the fan blade 200 when contacting and separating from the fan blade 200, the flow of the airflow is improved, and the working noise of the fan blade 200 is further reduced.

[0053] Referring to Figure 6 As shown, it can be understood that, on the rotation plane, the circumferential angle between the leading edge 250 and the center of the hub 100 forms a first wrap angle β, and the circumferential angle between the trailing edge 260 and the center of the hub 100 forms a second wrap angle α.

[0054] From the hub 100 in the radial direction to the direction of the rim 300, the chord length of the fan blade 200 on the cylindrical section gradually increases. By setting the second wrap angle α of the trailing edge 260 to be greater than the first wrap angle β of the leading edge 250, the increase amount of the chord length can be offset, the length increase rate of the chord length is reduced, the chord length of the fan blade 200 is slowly increased, the structural consistency of the fan blade 200 in the radial direction of the hub 100 is improved, and the stress structure of the fan blade 200 is optimized.

[0055] Optionally, the sum of the first wrap angle α of the leading edge 250 and the second wrap angle β of the trailing edge 260 of the fan blade 200 is generally greater than the conventional wrap angle (about 30°) of the fan blade 200. By using a large wrap angle design, the surface area of the blade work can be effectively increased, the air volume of the fan is increased, the blade load of the fan is reduced, and the noise is further reduced.

[0056] Further, the included angle between at least some adjacent vanes 200 in the plurality of vanes 200 and the included angle between the remaining adjacent vanes 200 are different along the circumference of the hub 100. Specifically, the size of the impeller of the current compact fan is usually set to 12 inches, and the number of vanes 200 in the impeller needs to be set to an odd number to avoid resonance, so under the premise of ensuring the air volume, the number of vanes 200 of the compact fan is mostly set to seven or nine. For example, when the number of vanes 200 is seven, the vanes 200 can be divided into "2-2-2-1" four groups or "3-3-1" three groups, etc., the included angle of adjacent vanes 200 in the same group is equal, and the included angle of vanes 200 between different groups is not equal; when the number of vanes 200 is nine, the vanes 200 can be divided into "3-3-3" three groups or "4-4-1" three groups, etc., the included angle of adjacent vanes 200 in the same group is equal, and the included angle of vanes 200 between different groups is not equal.

[0057] The noise of the axial fan mainly comes from the aerodynamic noise source, which includes narrow-band discrete rotating noise and wide-band vortex noise, and the sound pressure level of the discrete noise is much higher than that of the wide-band noise. By using the design of non-uniformly arranged multiple groups of vanes 200, the impact of the wake flow of the vanes 200 on the downstream object can be reduced, thereby reducing the sound pressure fluctuation, while meeting the flow requirement, the noise level is significantly reduced. The number of groups of the plurality of vanes 200, the number of vanes 200 in each group, and the size of the included angle are not specifically limited, as long as the discrete rotating noise can be reduced.

[0058] Referring to Figure 1 As shown, it can be understood that the rim 300 is provided with a peripheral portion 310, the peripheral portion 310 is arranged around the rim 300, and the outer edge of the peripheral portion 310 is folded back along the axial direction of the hub 100 to form a secondary vortex prevention ring 311.

[0059] Along the axis of the hub 100, the air inlet and air outlet are located on both sides of the vanes 200, and there are gaps between the vanes 200, so that vortexes will inevitably be generated, and the vortexes are more serious at the connection between the vanes 200 and the rim 300. By arranging the secondary vortex prevention ring 311, the structural strength of the vortex prevention ring outside the vanes 200 can be increased, which helps to eliminate most of the vortexes at this position and further reduce the noise.

[0060] Referring to Figure 7 (Circular marks in the figure represent existing fans, triangular marks represent fans of the present application) to Figure 13As shown, it can be understood that, by aerodynamic optimization on the wrap angle, chord length, streamline shape, angle of inclination of the fan blade 200 at the hub 100 side, angle of inclination of the fan blade 200 at the rim 300 side, cross section of the fan blade 200, arrangement of the fan blade 200, secondary vortex prevention ring 311 and the like, the fan power of the fan blade 200 can be improved, the aerodynamic static pressure efficiency of the fan (i.e. the proportion of change of the fan air volume generated per unit input power) can be improved, especially the efficiency at the design air volume and air side pressure head point can be improved by 4%-21%, and the aerodynamic improvement efficiency is more obvious with the increase of the rotation speed, and the fan air volume is higher; meanwhile, the noise is reduced by 4-7dB, and the noise reduction is more obvious with the increase of the rotation speed.

[0061] Referring to Figure 11 , Figure 12 and Figure 14 As shown, it can be understood that, due to the above-mentioned aerodynamic optimization, in addition to the noise reduction and the air volume improvement, the input power of the fan is significantly reduced, and at high rotation speed, the input power of the new fan blade type is only 84%-86% of the input power of the existing fan blade type, and with the reduction of the rotation speed of the fan, the input power of the new fan blade type is slightly improved, but the fan power can reach 84%-94% of the power of the existing fan, thereby reducing energy consumption and improving the green environmental protection of the fan.

[0062] The utility model discloses still provide a kind of energy storage thermal management unit, including multiple fans, fan includes shell and above-mentioned fan impeller, fan impeller and shell rotation is connected.

[0063] The energy storage thermal management unit provided by the embodiments of the present application includes the fan impeller in the above embodiments, so the energy storage thermal management unit provided by the embodiments of the present application also has the beneficial effects described in the above embodiments, which will not be repeated here.

[0064] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. For ordinary skilled in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present application. Here, it is unnecessary and impossible to enumerate all the implementation modes. Any modification, equivalent substitution and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A fan impeller, characterized by, The fan wheel comprises: a hub (100); a plurality of fan blades (200) connected to the hub (100) and arranged along the circumference of the hub (100); a rim (300) arranged around the hub (100) and connected to one end of the fan blades (200) away from the hub (100); wherein the fan blades (200) have a rotation plane perpendicular to the axis of the hub (100), the fan blades (200) are arranged obliquely relative to the rotation plane, and the inclination angle of the fan blades (200) gradually decreases along the radial direction of the hub (100) from the hub (100) to the rim (300).

2. A fan impeller according to claim 1, wherein The inclination angle of the fan blades (200) at the hub (100) decreases at a speed greater than the inclination angle of the fan blades (200) at the rim (300).

3. A fan impeller according to claim 2, wherein The inclination angle of the fan blades (200) is θ, and 15°≤θ≤25°.

4. A fan impeller according to claim 2, wherein The inclination angle of the fan blades (200) at the hub (100) decreases at a speed V1, and the inclination angle of the fan blades (200) at the rim (300) decreases at a speed V2, and 0≤V1≤0.45° / mm and 0≤V2≤0.45° / mm.

5. A fan impeller according to any one of claims 1 to 3, wherein The shape of the fan blades (200) on a cylindrical cross section concentric with the axis of the hub (100) is airfoil-shaped.

6. A fan impeller according to any one of claims 1 to 3, wherein The fan blades (200) have a leading edge (250) and a trailing edge (260) arranged along the rotation direction of the fan blades (200), and the projections of the leading edge (250) and the trailing edge (260) in the rotation plane are respectively streamlined.

7. A fan impeller according to claim 6, wherein On the rotation plane, the circumferential angle between the leading edge (250) and the center of the hub (100) forms a first wrap angle, and the circumferential angle between the trailing edge (260) and the center of the hub (100) forms a second wrap angle, and the second wrap angle is greater than the first wrap angle.

8. A fan impeller according to any one of claims 1 to 3, wherein The rim (300) is provided with a peripheral portion (310) arranged around the rim (300), and the outer edge of the peripheral portion (310) is folded back in the axial direction of the hub (100) to form a secondary vortex prevention ring (311).

9. A fan impeller according to any one of claims 1 to 3, wherein Along the circumference of the hub (100), the included angle between at least some adjacent fan blades (200) in the plurality of fan blades (200) is different from the included angle between the remaining adjacent fan blades (200).

10. An energy storage thermal management unit, characterized by, The fan comprises a plurality of fan wheels, each fan wheel comprising a housing and a fan wheel according to any one of claims 1-9, the fan wheel and the housing being rotationally connected.

Images